FN Thomson Reuters Web of Science™ VR 1.0 PT J AU KISKIS, DL SHIN, KG AF KISKIS, DL SHIN, KG TI SWSL - A SYNTHETIC WORKLOAD SPECIFICATION LANGUAGE FOR REAL-TIME SYSTEMS SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE SYNTHETIC WORKLOADS; REAL-TIME WORKLOADS; DISTRIBUTED REAL-TIME SYSTEMS; PERFORMANCE AND DEPENDABILITY MEASUREMENT EXPERIMENTS ID DESIGN AB In this paper, we discuss the issues that must be addressed in the specification and generation of synthetic workloads for distributed real-time systems. We describe a synthetic workload specification language (SWSL) that defines a workload in a form that can be compiled by a synthetic workload generator (SWG) to produce an executable synthetic workload. The synthetic workload is then downloaded to the target machine and executed while performance and dependability measurements are made. SWSL defines the workload at the task level using a data flow graph, and at the operation level using control constructs and synthetic operations taken from a library. It is intended to be easy to use, flexible, and capable of creating synthetic workloads that are representative of real-time workloads. It provides a compact, parameterized notation. It supports automatic replication of objects to facilitate the specification of large workloads for distributed real-time systems. It also provides extensive support for the experimentation process. C1 USN,RES LAB,CTR COMP HIGH ASSURANCE SYST,SOFTWARE ENGN SECT,WASHINGTON,DC. RP KISKIS, DL (reprint author), UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,REAL TIME COMP LAB,ANN ARBOR,MI 48109, USA. NR 36 TC 4 Z9 4 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0098-5589 J9 IEEE T SOFTWARE ENG JI IEEE Trans. Softw. Eng. PD OCT PY 1994 VL 20 IS 10 BP 798 EP 811 DI 10.1109/32.328992 PG 14 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PL950 UT WOS:A1994PL95000006 ER PT J AU WU, YL LEE, LH ROLLINS, DM CHING, WM AF WU, YL LEE, LH ROLLINS, DM CHING, WM TI HEAT SHOCK-INDUCED AND ALKALINE PH-INDUCED PROTEINS OF CAMPYLOBACTER-JEJUNI - CHARACTERIZATION AND IMMUNOLOGICAL PROPERTIES SO INFECTION AND IMMUNITY LA English DT Article ID WESTERN BLOT ANALYSIS; ESCHERICHIA-COLI; STRESS PROTEINS; ENTERITIS; INFECTION; BACTERIAL; SEQUENCE; ANTIGENS; DISEASE; PHYSIOLOGY AB The protein response to physiological stress was characterized in Campylobacter jejuni 81176 after exposure to heat and pH shock and following periods of recovery. Immunoreactivities of major stress-related proteins were determined with anti-Campylobacter immune rabbit serum and intestinal lavage fluid. Distinct proteins with molecular masses ranging from 10 to 120 kDa were induced and/or released by selective heat or pH treatments. The most notable responses were those of two proteins with apparent molecular masses of 45 and 64 kDa that were induced and two other proteins of 10 and 12 kDa that were released by selective heat shock, alkaline pH treatment, or both. On the basis of N-terminal sequence analysis and immunological crossreactivity data, the 64- and 10-kDa proteins were the C. jejuni homologs of Escherichia coli GroEL and GroES proteins, respectively. Enhanced chemiluminescence Western blotting (immunoblotting) revealed that all four proteins were among the major protein antigens recognized by anti-Campylobacter rabbit serum immunoglobulin G (IgG) and immune rabbit intestinal lavage IgA (secretory IgA). The results of this investigation suggest that the C. jejuni 10-, 12-, 45-, and 64-kDa proteins and a number of minor stress-related proteins deserve further evaluation of their respective roles in Campylobacter pathogenesis and immunity. C1 MICHIGAN TECHNOL UNIV,DEPT BIOL SCI,HOUGHTON,MI 49931. RP WU, YL (reprint author), USN,MED RES INST,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 43 TC 42 Z9 43 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD OCT PY 1994 VL 62 IS 10 BP 4256 EP 4260 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA PH298 UT WOS:A1994PH29800022 PM 7927682 ER PT J AU ROWE, NC KANAYAMA, Y AF ROWE, NC KANAYAMA, Y TI NEAR-MINIMUM-ENERGY PATHS ON A VERTICAL-AXIS CONE WITH ANISOTROPIC FRICTION AND GRAVITY EFFECTS SO INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH LA English DT Article ID SHORTEST PATHS; TERRAIN AB We determine near-optimal paths with respect to work against friction and gravity on the surface of a vertical-axis ideal cone, assuming a moving agent of negligible size, friction proportional to the normal force, and power-maximum and stability limitations on the agent. This can provide good paths across hilly terrain for mobile robots. Our previous work required difficult-to-obtain polyhedral terrain models; cone surface patches permit easier and better models. We prove that our near-optimal paths on a vertical-axis cone surface are not much more complex than on polyhedra: There are qualitatively 22 kinds of path behavior (as opposed to four on a polyhedral face), and the area of the surface optimally reachable from a fixed start point by a given qualitative behavior has mathematically simple boundaries (only line segments, circle arcs, and arcs of logarithmic spirals in azimuth projection). We examine the possible cases based on agent characteristics and cone steepness and provide ''behavior maps'' for quickly finding near-optimal paths between any two points on the cone surface. Our models incorporate discontinuous effects with respect to traversal heading. Comparisons with a program using uniform-grid path planning show our methods run considerably faster in less space, and our paths are much simpler to describe and easier to follow in the real world. RP ROWE, NC (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943, USA. NR 20 TC 9 Z9 9 U1 0 U2 0 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0278-3649 J9 INT J ROBOT RES JI Int. J. Robot. Res. PD OCT PY 1994 VL 13 IS 5 BP 408 EP 433 DI 10.1177/027836499401300503 PG 26 WC Robotics SC Robotics GA PK713 UT WOS:A1994PK71300003 ER PT J AU BORDEN, B AF BORDEN, B TI PROBLEMS IN AIRBORNE RADAR TARGET RECOGNITION SO INVERSE PROBLEMS LA English DT Article ID SINGULARITY EXPANSION; INVERSE SCATTERING; PRONYS METHOD; IDENTIFICATION; EXTRACTION; AIRCRAFT; DISCRIMINATION; POLE AB A brief overview of techniques which can be applied to the problem of radar-based classification and recognition of airborne targets from airborne platforms is presented. This problem is complicated by small system requirements and by limitations in both the quality and quantity of the data that can be obtained. Consequently, the true identification question is frequently abandoned in favour of broader 'categorization' approaches, and we shall discuss drawbacks of the various methods. In addition, we will try to identify areas of current research. RP BORDEN, B (reprint author), USN,CTR AIR WARFARE,RES DEPT,DIV WEAPONS,CHINA LAKE,CA 93555, USA. NR 67 TC 8 Z9 8 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0266-5611 J9 INVERSE PROBL JI Inverse Probl. PD OCT PY 1994 VL 10 IS 5 BP 1009 EP 1022 DI 10.1088/0266-5611/10/5/002 PG 14 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA PN046 UT WOS:A1994PN04600003 ER PT J AU COLLINS, MD KUPERMAN, WA AF COLLINS, MD KUPERMAN, WA TI INVERSE PROBLEMS IN OCEAN ACOUSTICS SO INVERSE PROBLEMS LA English DT Article ID CONSERVING PARABOLIC EQUATION; MATCHED-FIELD LOCALIZATION; WATER PACIFIC ENVIRONMENT; TIME-DOMAIN SOLUTION; SHALLOW-WATER; SOUND-PROPAGATION; VERTICAL ARRAY; WAVE-EQUATION; UNDERWATER ACOUSTICS; BROAD-BAND AB Inverse problems in ocean acoustics and methods for solving them are discussed. Some of the unknowns for remote sensing problems are sound speed in the ocean, sediment properties, and roughness parameters. Some of the unknowns for localization problems are source location, source time series, and source path. Since the ocean is a complex acoustic waveguide, forward models are important tools for solving ocean acoustic inverse problems. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 138 TC 25 Z9 26 U1 2 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0266-5611 J9 INVERSE PROBL JI Inverse Probl. PD OCT PY 1994 VL 10 IS 5 BP 1023 EP 1040 DI 10.1088/0266-5611/10/5/003 PG 18 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA PN046 UT WOS:A1994PN04600004 ER PT J AU PANDEY, RB SINKOVITS, RS ORAN, ES BORIS, JP AF PANDEY, RB SINKOVITS, RS ORAN, ES BORIS, JP TI SIMULATION OF THE GROWTH OF A BINARY COMPOSITE BY A CONTROLLED THERMAL ANNEALING SO JOURNAL DE PHYSIQUE I LA English DT Article ID ISING-MODEL; TEMPERATURE-GRADIENT; SIZE SEGREGATION; POWDERS; COMPACTS; DYNAMICS; SILICON AB The Metropolis algorithm is used to study the evolution of the density profile of particle species in a model binary composite material on a simple cubic lattice. A specified fraction of the lattice sites are occupied by particles of type A and the remaining sites are occupied by particles of type B. The Hamiltonian for the system includes both nearest-neighbor particle-particle interactions and the interaction of the particle with a gravitational held. Particle-particle interaction strength, gravity, and the temperature govern the hopping of each particle in our annealing process. Variation of the planar density of the system by particle type is studied as a function of annealing time, temperature, and the volume fraction of the two components. We observe a variety of density distributions such as a linear density gradient with the thickness, staircase like Variation in mass distribution, and their combinations over the length scales which depend on these parameters. The simulations show that a graded material with a desired density distribution can be designed by appropriately controlling the annealing period, temperature, and the volume fraction. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. RP PANDEY, RB (reprint author), UNIV SO MISSISSIPPI,DEPT PHYS & ASTRON,PROGRAM SCI COMP,HATTIESBURG,MS 39406, USA. NR 29 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4304 J9 J PHYS I JI J. Phys. I PD OCT PY 1994 VL 4 IS 10 BP 1427 EP 1438 PG 12 WC Physics, Multidisciplinary SC Physics GA PL172 UT WOS:A1994PL17200006 ER PT J AU PAUL, BD PAST, MR MCKINLEY, RM FOREMAN, JD MCWHORTER, LK SNYDER, JJ AF PAUL, BD PAST, MR MCKINLEY, RM FOREMAN, JD MCWHORTER, LK SNYDER, JJ TI AMPHETAMINE AS AN ARTIFACT OF METHAMPHETAMINE DURING PERIODATE DEGRADATION OF INTERFERING EPHEDRINE, PSEUDOEPHEDRINE, AND PHENYLPROPANOLAMINE - AN IMPROVED PROCEDURE FOR ACCURATE QUANTITATION OF AMPHETAMINES IN URINE SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID GC/MS C1 USN,DRUG SCREENING LAB,GREAT LAKES,IL 60088. RP PAUL, BD (reprint author), USN,DRUG SCREENING LAB,1321 GILBERT ST,NORFOLK,VA 23511, USA. NR 12 TC 16 Z9 16 U1 0 U2 0 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD OCT PY 1994 VL 18 IS 6 BP 331 EP 336 PG 6 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA PH544 UT WOS:A1994PH54400006 PM 7823540 ER PT J AU RUDOLPH, AS AF RUDOLPH, AS TI BIOMATERIAL BIOTECHNOLOGY USING SELF-ASSEMBLED LIPID MICROSTRUCTURES SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Article DE SELF-ASSEMBLY; LIPIDS; BLOOD SUBSTITUTES; CONTROLLED RELEASE; MONOLAYER FORMATION ID LIPOSOME-ENCAPSULATED HEMOGLOBIN; BLOOD SUBSTITUTE AB Lipids are a class of molecules which self-assemble into a variety of phase-dependent morphologies. We have employed self-assembled lipid microstructures in the development of a number of biomedical material applications. The blood substitute, liposome encapsulated hemoglobin, is being investigated for the in vivo delivery of hemoglobin without many of the inherent toxicities associated with the delivery of free hemoglobin. This investigation is currently focused on demonstrations of efficacy in stressed animal models and on the safety of administering this material in models of sepsis. The synthetic modification of phospholipids to include photopolymerizable moieties such as diacetylenes has resulted in the spontaneous self-assembly of a hollow microcylinder which we are investigating for the controlled release of growth factors in soft tissue regeneration. Self-assembled monolayers are also being explored for the ability to surface modify biomaterials for improved cell adhesion. Photolithographic techniques have been combined with monolayer deposition to fabricate coplanar patterns of cell adhesion and inhibiting moieties. This results in the ability to spatially control the adhesion of cells to biomaterial surfaces. These cell patterns can form the basis for understanding two- and three-dimensional cellular events on the biomaterial surface and for the fabrication of improved cell-based biocompatible surfaces. The spontaneous self-assembly of lipids to form structures of biotechnological interest presents a unique opportunity to exploit this class of molecules for biomaterial applications. (C) 1994 Wiley-Liss, Inc.(*) RP RUDOLPH, AS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 19 TC 25 Z9 27 U1 1 U2 9 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD OCT PY 1994 VL 56 IS 2 BP 183 EP 187 DI 10.1002/jcb.240560211 PG 5 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA PJ445 UT WOS:A1994PJ44500010 PM 7829578 ER PT J AU OWRUTSKY, JC BARONAVSKI, AP AF OWRUTSKY, JC BARONAVSKI, AP TI TIME-RESOLVED MULTIPHOTON IONIZATION STUDY OF THE 102 NM STATE OF NO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID OPTICAL DOUBLE-RESONANCE; HIGH RYDBERG STATES; NITRIC-OXIDE; PHOTOELECTRON-SPECTROSCOPY; EXCITED-STATES; ROTATIONAL AUTOIONIZATION; VACUUM-ULTRAVIOLET; PHOTO-IONIZATION; MOLECULE; DYNAMICS AB We have used subpicosecond deep UV laser pulses (near 205 nm) in a time-resolved (2+1) multiphoton ionization study of the two-photon state of NO at 102 nm via a one-photon resonance with the A (2) Sigma(+) (3s sigma) (v=2) state. The two-photon excited state lifetime exhibits a strong pressure dependence from which the collisionless lifetime and the bimolecular depopulation or quenching rate constant were obtained. The large quenching rate constant strongly suggests that the state is a medium (10-12) n Rydberg level in the series converging to the ground electronic state of NO+. The subnanosecond collisionless lifetime implies that this state is subject to predissociation and/or autoionization. RP OWRUTSKY, JC (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. RI Owrutsky, Jeffrey/K-7649-2012 NR 78 TC 3 Z9 3 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1994 VL 101 IS 7 BP 5708 EP 5716 DI 10.1063/1.467356 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PH987 UT WOS:A1994PH98700029 ER PT J AU LEWIS, DW SAPP, KW AF LEWIS, DW SAPP, KW TI INTRACRANIAL PLASMA-CELL GRANULOMA SO JOURNAL OF CHILD NEUROLOGY LA English DT Note C1 EASTERN VIRGINIA MED SCH,NORFOLK,VA 23501. RP LEWIS, DW (reprint author), USN HOSP,PORTSMOUTH,VA, USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU DECKER PERIODICALS INC PI HAMILTON PA 4 HUGHSON STREET SOUTH PO BOX 620, LCD 1, HAMILTON ON L8N 3K7, CANADA SN 0883-0738 J9 J CHILD NEUROL JI J. Child Neurol. PD OCT PY 1994 VL 9 IS 4 BP 449 EP 451 PG 3 WC Clinical Neurology; Pediatrics SC Neurosciences & Neurology; Pediatrics GA PN808 UT WOS:A1994PN80800024 PM 7822744 ER PT J AU IHDE, DC MULSHINE, JL KRAMER, BS STEINBERG, SM LINNOILA, RI GAZDAR, AF EDISON, M PHELPS, RM LESAR, M PHARES, JC GRAYSON, J MINNA, JD JOHNSON, BE AF IHDE, DC MULSHINE, JL KRAMER, BS STEINBERG, SM LINNOILA, RI GAZDAR, AF EDISON, M PHELPS, RM LESAR, M PHARES, JC GRAYSON, J MINNA, JD JOHNSON, BE TI PROSPECTIVE RANDOMIZED COMPARISON OF HIGH-DOSE AND STANDARD-DOSE ETOPOSIDE AND CISPLATIN CHEMOTHERAPY IN PATIENTS WITH EXTENSIVE-STAGE SMALL-CELL LUNG-CANCER SO JOURNAL OF CLINICAL ONCOLOGY LA English DT Article ID INTENSIVE INDUCTION CHEMOTHERAPY; METASTATIC BREAST-CANCER; SOUTHWEST-ONCOLOGY-GROUP; PHASE-III TRIAL; BRONCHOGENIC-CARCINOMA; COMBINATION CHEMOTHERAPY; PROGNOSTIC FACTORS; CLINICAL-TRIAL; DOSAGE SCHEDULES; CYCLOPHOSPHAMIDE AB Purpose: We performed a prospective randomized clinical trial to determine whether higher doses of etoposide and cisplatin (EP) yield more complete responses or longer survival in small-cell lung cancer (SCLC) patients. Patients and Methods: Ninety patients with previously untreated extensive-stage SCLC: fulfilled criteria for randomization to standard dose versus high-dose EP. Another 25 patients at risk of excessive toxicity from high-dose treatment were given standard-dose therapy. During cycles 1 and 2 of EP, patients on standard-dose treatment received intravenous etoposide 80 mg/m(2) on days 1 to 3 and cisplatin 80 mg/m(2) on day 1 every 3 weeks; high-dose treatment consisted of etoposide 80 mg/m(2) on days 1 to 5 and cisplatin 27 mg/m(2) on days 1 to 5 every 3 weeks. All patients received standard-dose EP in cycles 3 and 4. In cycles 5 through 8, completely responding patients continued standard-dose EP; all other patients received either cyclophosphamide, doxorubicin, and vincristine, or (if possible) a combination drug program based on in vitro drug sensitivity testing of tumor-cell lines established from individual patients. Results: Despite 68% higher doses and a 46% higher dose-rate intensity actually given to patients randomized to receive high-dose relative to chose randomised to receive standard-dose EP, complete response rates (23% v 22%; P = .99) and median survival durations (10.7 and 11.4 months, respectively; P = .68) were virtually identical. Complete responses occurred in 4% of patients and the median survival duration was 5.8 months in nonrandomized patients. Leukopenia (P < .0001), thrombocytopenia (P < .0001), febrile neutropenia (P = .01), and weight loss (P = .02) were significantly more common in patients randomized to receive high-dose compared with standard-dose EP. Conclusion: No therapeutic benefits resulted from increasing planned doses by 67% for the first two cycles of EP in patients with extensive-stage SCLC. Higher doses were associated with substantially worse toxicities. C1 NCI, USN, MED ONCOL BRANCH, RADIAT ONCOL BRANCH, BETHESDA, MD 20892 USA. NCI, BIOSTAT & DATA MANAGEMENT SECT, BETHESDA, MD USA. NATL NAVAL MED CTR, DEPT MED, BETHESDA, MD USA. UNIFORMED SERV UNIV HLTH SCI, DEPT RADIOL, BETHESDA, MD USA. NR 68 TC 205 Z9 208 U1 1 U2 6 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0732-183X J9 J CLIN ONCOL JI J. Clin. Oncol. PD OCT PY 1994 VL 12 IS 10 BP 2022 EP 2034 PG 13 WC Oncology SC Oncology GA PL363 UT WOS:A1994PL36300005 PM 7931470 ER PT J AU SHIN, J VERMA, A STRINGFELLOW, GB GEDRIDGE, RW AF SHIN, J VERMA, A STRINGFELLOW, GB GEDRIDGE, RW TI TRISDIMETHYLAMINOANTIMONY - A NEW SB SOURCE FOR LOW-TEMPERATURE EPITAXIAL-GROWTH OF INSB SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID VAPOR-PHASE EPITAXY; TRIISOPROPYLANTIMONY; TRIMETHYLINDIUM; TERTIARYBUTYLDIMETHYLANTIMONY; MOVPE; GAAS AB Many new Sb sources for organometallic vapor phase epitaxial (OMVPE) growth of low energy band gap III/V antimonides have been developed and tested. However, most of the precursors including trimethylantimony (TMSb), triisopropylantimony (TIPSb), diisopropylantimonyhydride (DIPSbH), and tertiarybutyldimethylantimony (TBDMSb) have significant drawbacks such as inefficient pyrolysis at low temperatures or high levels of carbon contamination in the materials produced. In this work, a new Sb source, trisdimethylaminoantimony (TDMASb) [Sb(N(CH3)(2))(3)], has been used with trimethylindium (TMIn) for the growth of InSb epitaxial layers by atmospheric pressure OMVPE. This precursor is found to be particularly effective at low growth temperatures. V/III ratios for growth of good morphology layers were less than 3 for growth temperatures of 300 to 425 degrees C. A V/III ratio of less than 1 was optimum at 275 degrees C since the TDMASb pyrolyzes more efficiently than TMIn at this temperature. Higher growth efficiencies (growth rate/group III molar flow rate) were observed than for other Sb precursors for growth temperatures below 400 degrees C. From the photoluminescence (PL) spectra and X-ray diffraction data, it was confirmed that good InSb crystallographic quality was obtained for growth temperatures from 425 to as low as 275 degrees C. For the first time, PL at 10 K has been observed from InSb epitaxial layers grown at 300 degrees C. The free electron concentrations of the InSb epitaxial layers were measured to be between 2.7 X 10(16) and 5 x 10(17) cm(-3) over the entire range of growth temperature. Thus, the very high levels of carbon incorporation measured for low-temperature growth using several other Sb precursors was avoided using TDMASb. These results indicate that the new Sb precursor, TDMASb, is excellent for OMVPE growth of InSb and appears to be the best source to date for low temperature growth. C1 USN,CTR WARFARE,DIV CHEM,DIV WEAP,OPT & ELECTR MAT BRANCH,CHINA LAKE,CA 93555. RP SHIN, J (reprint author), UNIV UTAH,DEPT MAT SCI,SALT LAKE CITY,UT 84112, USA. NR 20 TC 23 Z9 23 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD OCT PY 1994 VL 143 IS 1-2 BP 15 EP 21 DI 10.1016/0022-0248(94)90362-X PG 7 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA PJ946 UT WOS:A1994PJ94600003 ER PT J AU KAISER, JF PROCTORSHIPMAN, L AF KAISER, JF PROCTORSHIPMAN, L TI SQUAMOUS-CELL CARCINOMA IN-SITU (BOWENS-DISEASE) MIMICKING SUBUNGUAL VERRUCA-VULGARIS SO JOURNAL OF FAMILY PRACTICE LA English DT Note DE CARCINOMA, SQUAMOUS CELL; PATHOLOGY; SURGERY; NAIL DISEASES, MICROBIOLOGY; PAPILLOMAVIRUS; CLASSIFICATION ID PAPILLOMAVIRUS TYPE-16 DNA; INTERNAL MALIGNANCY; NAIL BED; EPIDERMOID CARCINOMA; NEOPLASIA AB Squamous cell carcinoma uncommonly presents as a primary neoplasm of the nail. When occurring in the periungual region, this malignancy may mimic a wide variety of infectious, inflammatory, and neoplastic disorders, including the common wart. We present the case of a 62-year-old man with subungual squamous cell carcinoma in situ that for many years was treated as a verruca. C1 USN,MED CTR,DEPT DERMATOL,SAN DIEGO,CA 92134. RP KAISER, JF (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 35 TC 5 Z9 5 U1 0 U2 0 PU APPLETON & LANGE PI E NORWALK PA 25 VAN ZANT ST, E NORWALK, CT 06855 SN 0094-3509 J9 J FAM PRACTICE JI J. Fam. Pract. PD OCT PY 1994 VL 39 IS 4 BP 384 EP 387 PG 4 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA PM245 UT WOS:A1994PM24500017 PM 7931119 ER PT J AU FRIEDMAN, H AF FRIEDMAN, H TI FROM IONOSONDE TO ROCKET SONDE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article AB The 75th Anniversary of the AGU marks the discovery of the basic features of solar control of the ionosphere. A quarter of a century later our understanding of ionospheric physics was revolutionized by the early rocket era of upper air research that brought the discoveries of solar X ray and XUV radiation. RP FRIEDMAN, H (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 28 TC 1 Z9 1 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1994 VL 99 IS A10 BP 19143 EP 19153 DI 10.1029/94JA00106 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PK515 UT WOS:A1994PK51500004 ER PT J AU COHEN, R JAFFE, ES STETLERSTEVENSON, MA SAUSVILLE, EA DENIGRIS, EC WOODWORTH, T FOSS, FM AF COHEN, R JAFFE, ES STETLERSTEVENSON, MA SAUSVILLE, EA DENIGRIS, EC WOODWORTH, T FOSS, FM TI BILATERAL ADRENAL HEMORRHAGE AND ADRENAL INSUFFICIENCY IN A PATIENT WITH LYMPHOMATOUS ADRENAL INFILTRATION FOLLOWING ADMINISTRATION OF A FUSION TOXIN (DAB(486)INTERLEUKIN-2) SO JOURNAL OF IMMUNOTHERAPY LA English DT Article DE DAB(486)INTERLEUKIN-2; FUSION TOXIN THERAPY ID T-CELL LYMPHOMA; PHASE-I TRIAL; INTERLEUKIN-2 RECEPTOR; PROTEIN; EXPRESSION; MALIGNANCIES; DAB486IL-2 AB DAB(486)IL-2 is a novel fusion toxin in which the ADP-ribosyltransferase and membrane-translocating domains of diphtheria toxin have been combined with the interleukin-2 (IL-2) gene, creating a recombinant protein capable of selectively intoxicating cells bearing the high-affinity IL-2 receptor. Clinical activity has been documented in Hodgkin disease and the non-Hodgkin lymphomas; toxicities have been minimal and include mild hepatic transaminitis, proteinurea, and hypersensitivity reactions. In this report, a patient with tumor-stage cutaneous T-cell lymphoma developed clinical adrenal failure with bilateral adrenal hemorrhage and necrosis 7 weeks after completing a 5-day course of treatment with DAB(486)IL-2. The relationship of fusion toxin therapy to the development of this unusual toxicity is discussed. C1 USN,NCI,MED ONCOL BRANCH,BETHESDA,MD. BETHESDA NAVAL HOSP,DEPT PATHOL,BETHESDA,MD. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD. NCI,PATHOL LAB,BETHESDA,MD. NCI,BIOL CHEM LAB,BETHESDA,MD. SERAGEN INC,HOPKINTON,MA. NR 21 TC 2 Z9 2 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 1053-8550 J9 J IMMUNOTHER JI J. Immunother. PD OCT PY 1994 VL 16 IS 3 BP 229 EP 233 DI 10.1097/00002371-199410000-00008 PG 5 WC Oncology; Immunology; Medicine, Research & Experimental SC Oncology; Immunology; Research & Experimental Medicine GA PM631 UT WOS:A1994PM63100008 PM 7834123 ER PT J AU KGOPALAKRISHNAN, GK BURNS, WK MCELHANON, RW BULMER, CH GREENBLATT, AS AF KGOPALAKRISHNAN, GK BURNS, WK MCELHANON, RW BULMER, CH GREENBLATT, AS TI PERFORMANCE AND MODELING OF BROAD-BAND LIBNBO3 TRAVELING-WAVE OPTICAL-INTENSITY MODULATORS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID GHZ; WAVELENGTH; BANDWIDTH; VOLTAGE AB The design, fabrication, and characterization of a travelling wave Ti:LiNbO3 Mach-Zehnder interferometric modulator are discussed. The dependence of the velocity match condition on electrode thickness and wall angle is demonstrated experimentally and with finite element calculations. A set of test electrode structures is fabricated to study electrical losses in the modulator electrode. Loss coefficients are assigned to different sections of the device, and dielectric and radiative losses are shown to play an important role at high frequencies. This information is used to conjunction with finite-element calculations to develop accurate models for both the electrical and optical responses. The frequency dependence of the half-wave voltage is measured and shown to be in good agreement with a model. RP KGOPALAKRISHNAN, GK (reprint author), USN,RES LAB,MARYLAND ADV DEV LAB,OPT TECH BRANCH,OPT WAVEGUIDE SECT,CODE 5671,WASHINGTON,DC 20375, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD OCT PY 1994 VL 12 IS 10 BP 1807 EP 1819 PG 13 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA PP529 UT WOS:A1994PP52900014 ER PT J AU LAMBRAKOS, SG METZBOWER, EA MILEWSKI, J LEWIS, G DIXON, R KORZEKWA, D AF LAMBRAKOS, SG METZBOWER, EA MILEWSKI, J LEWIS, G DIXON, R KORZEKWA, D TI SIMULATION OF DEEP PENETRATION WELDING OF STAINLESS-STEEL USING GEOMETRIC CONSTRAINTS BASED ON EXPERIMENTAL INFORMATION SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE DEEP PENETRATION; NUMERICAL MODELING; GEOMETRIC CONSTRAINTS AB Results of a numerical simulation of deep penetration welding of 304 stainless steel are presented. This numerical model calculates the temperature and fluid velocity fields in a three-dimensional workpiece undergoing deep-penetration electron beam melding. The deposition of power from the beam and energy outflow at the model-system boundaries is effected by means of time-dependent boundary conditions on the equations of energy and momentum transfer. The vapor-liquid interface defining the keyhole is represented by a surface whose temperature is that of vaporization for the steel. On this surface, are specified boundary conditions for the momentum transfer equations such that the component of the velocity normal to the keyhole vapor-liquid interface is zero. In addition, this study introduces two nem numerical procedures. These procedures are based on the inclusion of experimental information concerning beam spot size and weld pool geometry into the model system via constraints and the deduction of effective keyhole shape via an inverse mapping scheme. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LAMBRAKOS, SG (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,CODE 6324,WASHINGTON,DC 20375, USA. NR 6 TC 11 Z9 11 U1 0 U2 2 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD OCT PY 1994 VL 3 IS 5 BP 639 EP 648 DI 10.1007/BF02645262 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA QE403 UT WOS:A1994QE40300009 ER PT J AU BARRERA, EV SIMS, J CALLAHAN, DL PROVENZANO, V MILLIKEN, J HOLTZ, RL AF BARRERA, EV SIMS, J CALLAHAN, DL PROVENZANO, V MILLIKEN, J HOLTZ, RL TI PROCESSING OF FULLERENE-REINFORCED COMPOSITES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID BUCKMINSTERFULLERENE; C-60; PRESSURE AB This work has been motivated by the current interest in using fullerenes as a possible reinforcement in structural materials. The fullerenes (of which C-60 is the most common) are nanometer in size and have been observed to be stable in contact with various metal systems. Therefore, they offer a nanosize reinforcement that is lightweight and hollow. In this research the emphasis was on processing metals with fullerene additions where the fullerenes were dispersed throughout the metal. Various processing approaches were employed to produce nanocrystalline materials, thin films, and powder-processed composites. Indications are that fullerenes remained unaltered with each processing approach in matrices of tin, copper, and aluminum. A key aspect of the processing of metals containing dispersed fullerenes was the use of fullerene sublimation. Along with the various processing methods identified, the methods of characterizing the fullerenes in the metals were also identified. C1 USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. RP BARRERA, EV (reprint author), RICE UNIV,DEPT MECH ENGN & MAT SCI,HOUSTON,TX 77251, USA. NR 17 TC 24 Z9 25 U1 1 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1994 VL 9 IS 10 BP 2662 EP 2669 DI 10.1557/JMR.1994.2662 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA PJ107 UT WOS:A1994PJ10700027 ER PT J AU BENDER, BA JESSEN, TL AF BENDER, BA JESSEN, TL TI A COMPARISON OF THE INTERPHASE DEVELOPMENT AND MECHANICAL-PROPERTIES OF NICALON AND TYRANNO SIC FIBER-REINFORCED ZRTIO4 MATRIX COMPOSITES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID ORGANOMETALLIC POLYMER PRECURSOR; HIGH-TENSILE STRENGTH; CERAMIC FIBERS; ELECTRON-MICROSCOPY; GLASS-CERAMICS; POLYTITANOCARBOSILANE; INTERFACES; CONVERSION AB The differences in interphase development and mechanical properties between Nicalon and Tyranno fiber-reinforced ZrTiO4 matrix composites were assessed. The composites were reinforced with either uncoated or BN-coated fibers. The microstructure and interphase development were analyzed using scanning electron microscopy, transmission electron microscopy, and analytical electron microscopy. Mechanical behavior was characterized by strength and toughness measurements. Tyranno composites developed thinner interphases due to the differences in the structure and chemistry of the starting fiber resulting from the addition of Ti to the starting polymer precursor. BN-coated fiber composites developed a thicker carbon interphase layer due to incorporation of O into the as-received BN coating. Tyranno composites were weakened by fiber clustering and were not as tough as Nicalon composites due to a lack of thermal debonding. RP BENDER, BA (reprint author), USN,RES LAB,CERAM & COMPOSITES BRANCH,WASHINGTON,DC 20375, USA. NR 55 TC 6 Z9 6 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1994 VL 9 IS 10 BP 2670 EP 2676 DI 10.1557/JMR.1994.2670 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA PJ107 UT WOS:A1994PJ10700028 ER PT J AU LOVE, RW AF LOVE, RW TI IN BITTER TEMPEST, THE BIOGRAPHY OF FLETCHER,FRANK,JACK - REGAN,SD SO JOURNAL OF MILITARY HISTORY LA English DT Book Review RP LOVE, RW (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA MILITARY INST PI LEXINGTON PA LEXINGTON, VA 24450 SN 0899-3718 J9 J MILITARY HIST JI J. Mil. Hist. PD OCT PY 1994 VL 58 IS 4 BP 764 EP 766 DI 10.2307/2944299 PG 3 WC History SC History GA PL379 UT WOS:A1994PL37900031 ER PT J AU SIU, NF SEDEGAH, M HOFFMAN, SL AF SIU, NF SEDEGAH, M HOFFMAN, SL TI IN-VITRO SURVIVAL AND RETENTION OF INFECTIVITY OF PLASMODIUM-YOELII SPOROZOITES OVER EXTENDED PERIODS OF TIME SO JOURNAL OF PARASITOLOGY LA English DT Note ID MALARIA AB The ability to maintain sporozoites in vitro should render the biological mechanism of sporozoite infectivity amenable to experimental analysis. With this in mind, Plasmodium yoelii Py17X(NL) clone 1.1 sporozoites were incubated at 4, 24, or 37 C for 0, 8, or 24 hr in tissue culture medium M199 with 5% normal mouse serum and penicillin-streptomycin. BALB/c mice were challenged intravenously with 5,000 in vitro-incubated sporozoites and then evaluated daily for parasitemia beginning on day 3 postinoculation. Sporozoites held at 24 C remained infective up to 24 hr unlike sporozoites incubated at 4 and 37 C. We observed 100% infection in mice challenged with a minimum of 200, 40, and 1,000 sporozoites that were in vitro incubated at 24 C at times 0, 24, and 36 hr, respectively. Infectivity was also maintained for 24 hr at 24 C in RPMI-1640 with 5% normal mouse serum and penicillin-streptomycin. Injection of 5,000 or 1,000 in vitro-cultured sporozoites gave 100% infection in BALB/c mice. We have demonstrated that P. yoelii sporozoites can survive in culture for extended periods of time with no apparent adverse effects on sporozoite infectivity. RP SIU, NF (reprint author), USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU AMER SOC PARASITOLOGISTS PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0022-3395 J9 J PARASITOL JI J. Parasitol. PD OCT PY 1994 VL 80 IS 5 BP 826 EP 829 DI 10.2307/3283266 PG 4 WC Parasitology SC Parasitology GA PK545 UT WOS:A1994PK54500022 PM 7931920 ER PT J AU ABRAHAM, MH WEATHERSBY, PK AF ABRAHAM, MH WEATHERSBY, PK TI HYDROGEN-BONDING .30. SOLUBILITY OF GASES AND VAPORS IN BIOLOGICAL LIQUIDS AND TISSUES SO JOURNAL OF PHARMACEUTICAL SCIENCES LA English DT Article ID PARTITION-COEFFICIENTS; CHROMATOGRAPHIC DATA; SOLVATION EQUATION; HYDROCARBONS; PREDICTION; BLOOD; POLYMERS; WATER; OIL; NONELECTROLYTES AB The general solvation equation log L = c + rR(2) + s pi(2)(H) + a alpha(2)(H) + b beta(2)(H) + I logL(16) has been used to analyze the solubility of solute gases and vapors, as log L values, in water, blood, and a variety of other biological fluids and tissues. The explanatory variables are R(2), the solute excess molar refraction; pi(2)(H), the solute dipolarity/polarizability; alpha(2)(H) and beta(2)(H), the solute hydrogen-bond acidity and basicity; and log L(16), where L(16) is the solute Ostwald solubility coefficient of hexadecane. The obtained coefficients then serve to characterize the biological phase as follows: r + s is the phase dipolarity/polarizability, a is the phase hydrogen-bond basicity, b is the phase hydrogen-bond acidity, and I is the phase lipophilicity. In addition to characterization of phases, the equation can be used to determine quantitatively solute/phase interactions and predict further log L values. A similar equation in which McGowan's characteristic volume, V-X, replaces the log L(16) descriptor can be used to analyze partitions between phases. For example, water/phase and blood/phase partition coefficients are analyzed, and the analysis leads again to coefficients that characterize phases and to the prediction of partition coefficients. C1 USN,SUBMARINE MED RES LAB,GROTON,CT 06349. RP ABRAHAM, MH (reprint author), UNIV LONDON UNIV COLL,DEPT CHEM,20 GORDON ST,LONDON WC1H 0AJ,ENGLAND. NR 28 TC 76 Z9 76 U1 3 U2 9 PU AMER PHARMACEUTICAL ASSN PI WASHINGTON PA 2215 CONSTITUTION AVE NW, WASHINGTON, DC 20037 SN 0022-3549 J9 J PHARM SCI JI J. Pharm. Sci. PD OCT PY 1994 VL 83 IS 10 BP 1450 EP 1456 DI 10.1002/jps.2600831017 PG 7 WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Pharmacology & Pharmacy SC Pharmacology & Pharmacy; Chemistry GA PK992 UT WOS:A1994PK99200016 PM 7884668 ER PT J AU LIM, HS ZELTER, GR SMITHRICK, JJ HALL, SW AF LIM, HS ZELTER, GR SMITHRICK, JJ HALL, SW TI DESTRUCTIVE PHYSICAL ANALYSIS RESULTS OF NI/H2 CELLS CYCLED IN LOW-EARTH-ORBIT REGIME .2. SO JOURNAL OF POWER SOURCES LA English DT Article ID NICKEL HYDROGEN CELLS; LIFE AB Six 48-Ah individual pressure vessel Ni/H-2 cells containing 26 and 31% KOH electrolytes have been on a low earth orbit cycle-life test. Three cells containing 31% KOH have failed after an average of 6400 cycles while the other three with 26% KOH have cycled for an average of 19 500 cycles. We have carried out post-cycle characterization tests and destructive physical analyses (DPA) of all cells. The DPA included visual inspections, measurements of electrode thickness, scanning electron microscopy, chemical analyses, and measurements of nickel electrode capacity in an electrolyte flooded cell. A gradual decrease of the usable cell capacity at high rate (1.4C) was the failure mode of all cells tested. Decrease of the usable capacity was due to decrease in the utilization of the active material with cycling mainly due to build-up of low rate capacity (residual capacity) and undischargeable active material. Cycle life of one of the cells might have been shortened prematurely due to the breakage of the cell core. Many gradual changes occurred with cycling at a rate which is independent of the KOH concentration. Each of these individual changes are difficult to be attributed to be the direct cause of the utilization decrease. However, an involved interaction of the changes might be responsible for the decrease. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. USN,CTR WEAP SUPPORT,CRANE,IN 47522. RP LIM, HS (reprint author), HUGHES AIRCRAFT CO,IND ELECTR GRP,TORRANCE,CA 90505, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD OCT PY 1994 VL 51 IS 3 BP 445 EP 456 DI 10.1016/0378-7753(94)80112-6 PG 12 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA PV282 UT WOS:A1994PV28200011 ER PT J AU KRESIN, VZ WOLF, SA AF KRESIN, VZ WOLF, SA TI SYMMETRY OF THE PAIRING STATE IN THE HIGH-T(C) OXIDES SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SYMMETRY OF THE PAIRING; GAPLESSNESS; YBCO; CUPRATES ID TEMPERATURE-DEPENDENCE; WAVE SUPERCONDUCTIVITY; PENETRATION DEPTH; THIN-FILMS; YBA2CU3O7; ANISOTROPY; TC AB There are conflicting experimental data related to the symmetry of the order parameter in cuprate superconductors. Our previously developed concept, which contains unusual s-wave pairing with a two-gap spectrum, energy gap anisotropy, and gaplessness for a nonstoichiometric state, provides a unified and consistent description of experimental data related to the symmetry. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRESIN, VZ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 33 TC 8 Z9 8 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1994 VL 7 IS 5 BP 865 EP 869 DI 10.1007/BF01320884 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA PN839 UT WOS:A1994PN83900016 ER PT J AU PHOTIADIS, DM AF PHOTIADIS, DM TI LOCALIZATION OF HELICAL FLEXURAL WAVES BY IRREGULARITY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ANDERSON LOCALIZATION; PROPAGATION; VIBRATION AB Small amounts of irregularity are known to produce vibration localization in one-dimensional chains, but the effects in two- and three-dimensional systems are typically much weaker. Here, a system with both one- and two-dimensional aspects, an axisymmetric, irregularly ribbed fluid-loaded cylindrical shell has been considered. A new formulation of this problem is given and each mode of the system is shown to be approximately equivalent to a nearest-neighbor coupled chain with six degrees of freedom corresponding to three left-going and three right-going traveling waves. An important theoretical ingredient of this investigation is the Green's function of the infinite fluid-loaded cylindrical shell. A new representation of the Green's function is given and it is shown that the long range coupling due to the adjoining fluid becomes very weak, falling off as z(-(n+1)) as the azimuthal mode number increases. Neglecting this weak coupling all the azimuthal modes are shown to be localized simultaneously by irregularity. The slow flexural waves have been shown to localize separately from the fast waves provided the helical angle of the flexural wave is greater than about (2 Omega beta p)(1/2). As the helical angle increases the effects of irregularity become much more important and very short localization lengths of the order of a single rib spacing can occur. RP PHOTIADIS, DM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 16 Z9 17 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1994 VL 96 IS 4 BP 2291 EP 2301 DI 10.1121/1.410101 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PL708 UT WOS:A1994PL70800034 ER PT J AU MURPHY, JE LI, GQ CHINBING, SA AF MURPHY, JE LI, GQ CHINBING, SA TI ORTHOGONALITY RELATION FOR RAYLEIGH-LAMB MODES OF VIBRATION OF AN ARBITRARILY LAYERED ELASTIC PLATE WITH AND WITHOUT FLUID LOADING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVE; REFLECTION; DISPERSION AB An orthogonality relation for the Rayleigh-Lamb modes of vibration of an isotropic, vertically layered elastic plate is derived. The derivation allows arbitrary variation of the plate properties in the vertical direction and includes the effects of fluid loading. C1 USN,RES LAB,DIV ACOUST,BAY ST LOUIS,MS 39529. RP MURPHY, JE (reprint author), UNIV NEW ORLEANS,DEPT PHYS,NEW ORLEANS,LA 70148, USA. NR 13 TC 13 Z9 13 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1994 VL 96 IS 4 BP 2313 EP 2317 DI 10.1121/1.410103 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PL708 UT WOS:A1994PL70800036 ER PT J AU MCDONALD, BE COLLINS, MD KUPERMAN, WA HEANEY, KD AF MCDONALD, BE COLLINS, MD KUPERMAN, WA HEANEY, KD TI COMPARISON OF DATA AND MODEL PREDICTIONS FOR HEARD ISLAND ACOUSTIC TRANSMISSIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID PROPAGATION; BERMUDA; OCEAN; AUSTRALIA; SPEED AB Propagation paths and signal characteristics from the Heard Island Feasibility Test are modeled using a combination of adiabatic mode theory, coupled mode theory, and parabolic equation (PE) methods. Adiabatic mode theory predicts the horizontal propagation paths (including small grazing angle reflections from bathymetry), group travel times, and estimates of signal loss due to bottom interaction. The PE calculations are performed primarily to illustrate modal coupling near sharp oceanic fronts and bathymetry intruding into the sound channel. They are carried out in depth and range along selected horizontal ray paths. For the Heard Island to Christmas Island path, we carry out a time domain pulse transmission using coupled mode equations. The result gives a pulse envelope in approximate agreement with observations. RP MCDONALD, BE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 35 Z9 37 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1994 VL 96 IS 4 BP 2357 EP 2370 DI 10.1121/1.410108 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PL708 UT WOS:A1994PL70800042 ER PT J AU CHIU, CS SEMTNER, AJ ORT, CM MILLER, JH EHRET, LL AF CHIU, CS SEMTNER, AJ ORT, CM MILLER, JH EHRET, LL TI A RAY VARIABILITY ANALYSIS OF SOUND-TRANSMISSION FROM HEARD ISLAND TO CALIFORNIA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OCEAN AB The influence of mesoscale and seasonal ocean variability on three-dimensional acoustic ray paths from Heard Island through the Southern and Pacific Oceans to the California coast is investigated. For the simulation of these global acoustic ray paths, a three-dimensional Hamiltonian ray-tracing code was used. The input sound-speed fields to the acoustic ray model were interpolated from gridded temperature and salinity output data from the Semtner-Chervin eddy-resolving, global, general circulation model. The ray-tracing results have provided input to experimental planners for receiver placement off the California coast in the Heard Island Feasibility Test and shed light on the variability of the acoustic paths, insonified locations, arrival azimuthal angles, and travel times. RP CHIU, CS (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. OI Miller, James H./0000-0001-7156-3589 NR 19 TC 13 Z9 14 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1994 VL 96 IS 4 BP 2380 EP 2388 DI 10.1121/1.410110 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PL708 UT WOS:A1994PL70800044 ER PT J AU BAGGEROER, AB SPERRY, B LASHKARI, K CHIU, CS MILLER, JH MIKHALEVSKY, PN VONDERHEYDT, K AF BAGGEROER, AB SPERRY, B LASHKARI, K CHIU, CS MILLER, JH MIKHALEVSKY, PN VONDERHEYDT, K TI VERTICAL ARRAY RECEPTIONS OF THE HEARD ISLAND TRANSMISSIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OCEAN AB A long, vertical line array was deployed off Monterey, California during the Heard Island Feasibility Test to measure the modal content of the received signals. The array contained 32, equally spaced hydrophones spanning from 345 to 1740-m depth. The multichannel data were recorded through a tether to the R/V POINT SUR. The measurements had very low signal to noise ratios and indicated the cw transmission losses were approximately 140 dB for a source/receiver range of 17 000 km. Modal content was analyzed using (i) the modal extent versus depth, (ii) frequency-vertical wave-number spectra, (iii) modal beamforming and (iv) least squares fitting. All led to the conclusion that the modal population is surprisingly rich. There was strong evidence of population up to at least mode seven in the data. C1 MONTEREY BAY AQUARIUM RES INST,MONTEREY,CA 93943. USN,POSTGRAD SCH,MONTEREY,CA 93943. SCI APPLICAT INT CORP,MCLEAN,VA 22102. WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. RP BAGGEROER, AB (reprint author), MIT,77 MASSACHUSETTS AVE,CAMBRIDGE,MA 02139, USA. OI Miller, James H./0000-0001-7156-3589 NR 23 TC 15 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1994 VL 96 IS 4 BP 2395 EP 2413 DI 10.1121/1.410112 PG 19 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PL708 UT WOS:A1994PL70800046 ER PT J AU GAUNAURD, GC HUANG, H AF GAUNAURD, GC HUANG, H TI ACOUSTIC SCATTERING BY A SPHERICAL BODY NEAR A PLANE BOUNDARY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVES AB Acoustic scattering is studied by considering spherical bodies near plane boundaries when they are insonified by plane waves at arbitrary incidence angles. Using the method of images, there is an image sphere on the side of the boundary opposite to the side containing the real sphere, and both the sphere and its image contribute to the resulting sound field. The plane boundary is introduced and the scattering problem is solved. The resulting sound field consists of four parts: the incident field, its reflection from the boundary, the scattered field from the sphere, and that scattered by its image. The whole solution is referred to the center of the real sphere, and any depth below the boundary is possible. The treatment is analytic and exact, and it uses the addition theorems for spherical wave functions and the whole (atomic-physics-like) machinery of the coupling of various angular momentum vectors. The required coupling coefficients b(mn) emerge from the solution of an infinite linear system of algebraic equations, which is appropriately truncated to obtain numerical predictions for the ''form functions.'' Form functions that account for either one or two of the four components of the total acoustic field, as well as for the overall effect of all four contributions together, are considered. The two individual components are shown so that the distortions they induce in the field can be separately assessed. All the form functions are displayed versus ka, for various values of the normalized sphere depth dla. These plots also serve to predict quantitatively the critical depths beyond which the effect of the boundary becomes negligible. They also provide exact benchmark curves against which the accuracy of some approximate techniques, based on the numerical evaluation of certain integral equations can be assessed. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK DETACHMENT RES DEPT,DAHLGREN DIV,SILVER SPRING,MD 20903, USA. NR 44 TC 32 Z9 35 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1994 VL 96 IS 4 BP 2526 EP 2536 DI 10.1121/1.410126 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PL708 UT WOS:A1994PL70800061 ER PT J AU RICE, RW WU, CC BORCHELT, F AF RICE, RW WU, CC BORCHELT, F TI HARDNESS GRAIN-SIZE RELATIONS IN CERAMICS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID FRACTURE-TOUGHNESS; SILICON-NITRIDE; TITANIUM CARBIDE; SINGLE-CRYSTALS; ANISOTROPY; MICROHARDNESS; DEPENDENCE; SYSTEM AB Both Vickers and Knoop hardness (H), measured at two or more loads in the range of 100-2000 g (most commonly 100 and 500 g) for a variety of dense oxide and non-oxide materials, covering a range of grain sizes (G), including single crystals where possible, were shown to generally be consistent with (often more limited) literature data. Apparently, conflicting trends of H (1) showing either no G dependence, (2) decreasing from single-crystal or large G values with decreasing G, or (3) having the generally accepted increase with decreasing G are shown to be due to the combination of the limited extent of data and H generally being determined by two basic trends. These two trends are (a) the normal inverse G (i.e., H-G-1/2) dependence at finer G, (b) a variable G minimum at intermediate G, and (c) H increasing with increasing G at larger G (to single-crystal values). The H minimum is due to local cracking around the indent (mostly along grain boundaries), generally reaching a maximum effect, e.g., minimum in H, when the indent and grain sizes are similar, and tends to be greater for Vickers vs Knoop indents, higher loads and probably greater grain boundary impurity, additive contents, and stresses. RP RICE, RW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 70 TC 169 Z9 170 U1 3 U2 33 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1994 VL 77 IS 10 BP 2539 EP 2553 DI 10.1111/j.1151-2916.1994.tb04641.x PG 15 WC Materials Science, Ceramics SC Materials Science GA PM483 UT WOS:A1994PM48300008 ER PT J AU AFANAS'EV, VV REVESZ, AG BROWN, GA HUGHES, HL AF AFANAS'EV, VV REVESZ, AG BROWN, GA HUGHES, HL TI DEEP AND SHALLOW ELECTRON TRAPPING IN THE BURIED OXIDE LAYER OF SIMOX STRUCTURES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID SIO2 AB Electrons were injected by UV light into the buried oxide (BOX) layer of pseudo-separation by implantation of oxygen structures in which the original top Si layer was replaced by a metal electrode. From the photocurrent and metal oxide semiconductor C-V characteristics, the trapping cross sections, density, and location of the electron traps were determined. Two deep neutral traps with (3 +/- 1) x 10(-16) and (2 x 1) x 10(-17) cm2 trapping cross sections are responsible for fixed negative charge formation under electron injection. There are also shallow traps present which are responsible for transient effects with a time constant of about 100 s associated with photocurrents. The cross section of the shallow traps is of the order of 10(-11) cm2 indicating that the traps are some inclusions (clusters) rather than network defects in the oxide. Both the deep and shallow traps are in the vicinity of the Si-substrate/BOX interface. C1 REVESZ ASSOCIATES, BETHESDA, MD 20817 USA. TEXAS INSTRUMENTS INC, DALLAS, TX 75265 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP AFANAS'EV, VV (reprint author), UNIV ST PETERSBURG, DEPT PHYS, ST PETERSBURG, RUSSIA. NR 15 TC 19 Z9 20 U1 0 U2 1 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1994 VL 141 IS 10 BP 2801 EP 2804 DI 10.1149/1.2059229 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PM013 UT WOS:A1994PM01300037 ER PT J AU BLACKLEDGE, RD VINCENTI, M AF BLACKLEDGE, RD VINCENTI, M TI IDENTIFICATION OF POLYDIMETHYLSILOXANE LUBRICANT TRACES FROM LATEX CONDOMS IN CASES OF SEXUAL ASSAULT SO JOURNAL OF THE FORENSIC SCIENCE SOCIETY LA English DT Article DE SEX CRIMES; POLYDIMETHYLSILOXANE; NONOXYNOL-9; LUBRICANTS; CONDOMS; DESORPTION CHEMICAL IONIZATION MASS SPECTROMETRY; FOURIER TRANSFORM INFRARED SPECTROSCOPY ID DESORPTION CHEMICAL IONIZATION; ION MASS-SPECTROMETRY; POLY(DIMETHYLSILOXANE); DISTRIBUTIONS; OLIGOMERS; SPECTRA AB A polydimethylsiloxane (PDMS) liquid is used as a lubricant by many condom manufacturers. Because the use of condoms in sex crimes is likely to increase, a protocol was developed that could extract PDMS and the spermicide nonoxynol-9 from evidence items and separately identify them by Fourier transform infrared spectroscopy. Additionally, at least some discrimination was provided by microscopically identifying insoluble lubricants such as corn starch, lycopodium, silica, and talc which are added to some brands. Desorption chemical ionization mass spectrometry was used to compare the PDMS used by different manufacturers and to detect as little as 20 ng. The protocol was successfully used in two actual cases, one in which the assailant wore a lubricated condom, and a second in which he did not, but claimed to have done so. C1 UNIV TURIN,DIPARTIMENTO CHIM ANAL,I-10125 TURIN,ITALY. RP BLACKLEDGE, RD (reprint author), USN,CRIMINAL INVEST SERV,REG FORENS LAB,BOX 368220,SAN DIEGO,CA 92136, USA. RI Vincenti, Marco/M-3495-2015 OI Vincenti, Marco/0000-0002-6275-7194 NR 22 TC 22 Z9 22 U1 1 U2 10 PU FORENSIC SCIENCE SOC PI HARROGATEKSHIRE PA CLARK HOUSE, 18A MOUNT PARADE, HARROGATEKSHIRE, N YORKSHIRE, ENGLAND HG1 1BX SN 0015-7368 J9 J FORENSIC SCI SOC PD OCT-DEC PY 1994 VL 34 IS 4 BP 245 EP 256 DI 10.1016/S0015-7368(94)72928-5 PG 12 WC Medicine, Legal; Pathology SC Legal Medicine; Pathology GA QD235 UT WOS:A1994QD23500007 PM 7844517 ER PT J AU BAILEY, M KEMPLE, W WEST, M CHASE, C AF BAILEY, M KEMPLE, W WEST, M CHASE, C TI OBJECT-ORIENTED MODELING OF MILITARY COMMUNICATIONS NETWORKS SO JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY LA English DT Article DE OBJECT-ORIENTED SIMULATION; COMMAND AND CONTROL; MILITARY OPERATIONS RESEARCH AB Military communications networks are large complex systems; their physical dynamics, composition, workload characteristics and operational goals make them very hard to model and analyse. It is particularly difficult to build a generalized model that can adequately fit each instance, generate a workload that exercises the network in a realistic way, and measure network effectiveness in terms of the operational goals. In this work, we describe our approach to building such a model for the US Marine Corps, and demonstrate the model's use by solving a particular equipment allocation problem. We combine object-oriented simulation with new concepts for workload modelling and measuring effectiveness that are based on the operational tasks the Marines perform. RP BAILEY, M (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93940, USA. NR 8 TC 1 Z9 1 U1 0 U2 1 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0160-5682 J9 J OPER RES SOC JI J. Oper. Res. Soc. PD OCT PY 1994 VL 45 IS 10 BP 1108 EP 1122 PG 15 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA PK182 UT WOS:A1994PK18200002 ER PT J AU SCOTT, AM WHITNEY, WT DUIGNAN, MT AF SCOTT, AM WHITNEY, WT DUIGNAN, MT TI STIMULATED BRILLOUIN-SCATTERING AND LOOP THRESHOLD REDUCTION WITH A 2.1-MU-M CR,TM,HO-YAG LASER SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID PHASE-CONJUGATION AB We have investigated stimulated Brillouin scattering (SBS) in carbon disulfide, using a frequency-narrowed Cr,Tm,Ho:YAG laser operating at 2.12 mu m. Threshold reduction with a novel loop geometry is also demonstrated. A model for the loop-SBS scheme is developed and compared with experimental results. Backscatter power, energy, and conjugate-fidelity data are presented. RP SCOTT, AM (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 5640,WASHINGTON,DC 20375, USA. NR 29 TC 7 Z9 8 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD OCT PY 1994 VL 11 IS 10 BP 2079 EP 2088 DI 10.1364/JOSAB.11.002079 PG 10 WC Optics SC Optics GA PL223 UT WOS:A1994PL22300021 ER PT J AU LIGRANI, PM MITCHELL, SW AF LIGRANI, PM MITCHELL, SW TI EFFECTS OF EMBEDDED VORTICES ON INJECTANT FROM FILM-COOLING HOLES WITH LARGE SPANWISE SPACING AND COMPOUND ANGLE ORIENTATIONS IN A TURBULENT BOUNDARY-LAYER SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 38th International Gas Turbine and Aeroengine Congress and Exposition CY MAY 24-27, 1993 CL CINCINNATI, OH SP INT GAS TURBINE INST ID TURBINE BLADE; HEAT-TRANSFER; VORTEX; FLOWS AB Experimental results are presented that describe the effects of embedded, longitudinal vortices on heal transfer and film injectant downstream of a single row of firm cooling holes with compound angle orientations. Holes are spaced 7.8 hole diameters apart in the spanwise direction so that information is obtained on the interactions between the vortices and the injectant from a single hole. The compound angle holes are oriented so that their angles with respect to the test surface are 30 deg in a spanwise/normal plane projection, and 35 deg in a streamwise/normal plane projection. A blowing ratio of 0.5 is employed and the ratio of vortex core diameter to hole diameter is 1.6-1.67 just downstream of the injection holes (x/d=10.2). At the same location, vortex circulation magnitudes range from 0.15 m(2)/s to 0.18 m(2)/s. The most important conclusion is that local heal transfer and injectant distributions are strongly affected by the longitudinal embedded vortices, including their directions of rotation and their spanwise positions with respect to film injection holes. To obtain information on the latter, clockwise rotating vortices R0-R4 and counterclockwise rotating vortices L0-L4 are placed at different spanwise locations with respect to the central injection hole located on the spanwise centerline. With vortices R0-R4, the greatest disruption to the film is produced by the vortex whose downwash passes over the central hole (R0). With vortices L0-L4, the greatest disruption is produced by the vortices whose cores pass over the central hole (L1 and L2). To minimize such disruptions, vortex centers must pass at least 1.5 vortex core diameters away from an injection hole on the upwash sides of the vortices and 2.9 vortex core diameters away on the downwash sides of the vortices. Differences resulting from vortex rotation are due to secondary flow vectors, especially beneath vortex cores, which are in different directions with respect to the spanwise velocity components of injectant after it exits the holes. When secondary flow vectors near the wall are in the same direction as the spanwise components of the injectant velocity (vortices R0-R4), the film injectant is more readily swept beneath vortex cores and into vortex upwash regions than for the opposite situation in which near-wall secondary flow vectors ape opposite to the span wise components of the injectant velocity (vortices L0-L4). Consequently, higher Stanton numbers are generally present over larger portions of the rest surface with vortices R0-R4 than with vortices L0-L4. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP LIGRANI, PM (reprint author), UNIV UTAH,DEPT MECH ENGN,SALT LAKE CITY,UT 84112, USA. NR 18 TC 9 Z9 9 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD OCT PY 1994 VL 116 IS 4 BP 709 EP 720 DI 10.1115/1.2929464 PG 12 WC Engineering, Mechanical SC Engineering GA PP430 UT WOS:A1994PP43000020 ER PT J AU HEFFERNAN, JP HUISMAN, TK AF HEFFERNAN, JP HUISMAN, TK TI NEPHROGENIC ADENOMA IN A BLADDER DIVERTICULUM SO JOURNAL OF UROLOGY LA English DT Note DE ADENOMA; BLADDER; DIVERTICULOSIS; NEOPLASMS; METAPLASIA ID VESICAL DIVERTICULA; URINARY-BLADDER AB Nephrogenic adenoma is a rare proliferative response of urothelium to chronic irritation or infection. It has been reported to occur in various locations in the urinary tract, including the renal pelvis, ureter, bladder and urethra, and within an ileal conduit. We report our experience with this lesion occurring in a bladder diverticulum. C1 USN,CTR MED,DEPT UROL,SAN DIEGO,CA. RP HEFFERNAN, JP (reprint author), USN,CTR MED,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 20 TC 4 Z9 4 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD OCT PY 1994 VL 152 IS 4 BP 1208 EP 1210 PG 3 WC Urology & Nephrology SC Urology & Nephrology GA PF219 UT WOS:A1994PF21900051 PM 8072100 ER PT J AU WOLF, YG THOMAS, WS BRENNAN, FJ GOFF, WG SISE, MJ BERNSTEIN, EF AF WOLF, YG THOMAS, WS BRENNAN, FJ GOFF, WG SISE, MJ BERNSTEIN, EF TI COMPUTED-TOMOGRAPHY SCANNING FINDINGS ASSOCIATED WITH RAPID EXPANSION OF ABDOMINAL AORTIC-ANEURYSMS SO JOURNAL OF VASCULAR SURGERY LA English DT Article; Proceedings Paper CT 9th Annual Meeting of the Western-Vascular-Society CY JAN 09-13, 1994 CL SANTA BARBARA, CA SP W VASC SOC ID SELECTIVE MANAGEMENT; RUPTURE; ENLARGEMENT; ULTRASOUND; VARIABLES; SIZE AB Purpose: Early repair of abdominal aortic aneurysms (AAA) is particularly appropriate for those that are most likely to expand. Our aim was to define features on computed tomography (CT) scanning associated with subsequent rapid aneurysm expansion. Methods: We reviewed CT scans of 80 patients with AAA (>3.0 cm) who underwent CT scanning of the abdomen and pelvis two times, at least 6 months apart, between 1986 and 1992. The aneurysms initially measured 4.4 +/- 0.6 cm, and the mean interval between obtaining scans was 22 +/- 12 months. Clinical variables assessed included age, sex, medical risk factors, underlying cardiovascular and pulmonary diseases, and administration of beta blockers and Lipid-lowering agents. Computer-aided measurements on each CT scan section included the maximal and minimal diameters and area of the aneurysm. Dimensions of the luminal thrombus and the are of aneurysm wall covered by thrombus (TARC). Maximal aneurysm dimensions were related to juxtarenal aortic and second lumbar vertebral body dimensions. Results: Mean aneurysm expansion was 0.26 +/- 0.25 cm/yr. CT scanning variables that correlated significantly with rate of expansion included the mean TARC (r = 0.43, p < 0.001), thrombus volume fraction (r = 0.37, p < 0.001), TARC on the largest aneurysm cross section (r = 0.34, p < 0.01), and thrombus area fraction (r = 0.30, p < 0.01). Rapid expansion (>0.5 cm/yr) occurred in 15 (19%) aneurysms. The two predictors for rapid expansion on logistic regression analysis were mean TARC (p < 0.005) and the presence of carotid artery disease (p < 0.05). Conclusion: An increased AAA thrombus load is associated with a higher Likelihood of rapid expansion and should weigh in favor of early surgical repair. C1 SCRIPPS CLIN & RES FDN,DIV VASC & THORAC SURG,LA JOLLA,CA 92037. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT SURG,SAN DIEGO,CA 92134. NR 20 TC 119 Z9 119 U1 1 U2 6 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0741-5214 J9 J VASC SURG JI J. Vasc. Surg. PD OCT PY 1994 VL 20 IS 4 BP 529 EP 538 PG 10 WC Surgery; Peripheral Vascular Disease SC Surgery; Cardiovascular System & Cardiology GA PM004 UT WOS:A1994PM00400004 PM 7933254 ER PT J AU GAUNAURD, GC AKAY, A AF GAUNAURD, GC AKAY, A TI ISOLATION OF THE SPECTROGRAMS AND ROSETTES OF INSONIFIED SETS OF SUBMERGED, CONCENTRIC, THIN SHELLS SO JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME LA English DT Article AB The resonance features present, and observable, in the form-functions of submerged, fluid-filled, elastic, thin shells, usually appear combined with smooth, undesirable, background components that tend to obscure them. In order to isolate these features in the frequency domain, at fixed angles of observation, (i.e., the ''spectograms''), or in the angular domain, at selected frequencies (i.e., the ''rosette'' patterns), one usually attempts to suppress the background components by subtracting ''suitable'' background coefficients. Since the rigid/soft background coefficients of solid elastic bodies/cavities in solids yield unsatisfactory results for thin shells, various other background coefficients have been tried with various levels of success. We present here a more general scattering formulation, valid for many concentric shells, that permits the isolation of these resonance features without having to subtract any type of background coefficients. This resonance feature extraction is achieved either conceptually, or physically, filling the various spaces in between the various concentric shells, with the same fluid present in the outer ambient medium. The extraction of these echo-features is crucial for purposes of active classification by sonar. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK DETACHMENT R34,DEPT RES & DEV,SILVER SPRING,MD 20903, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 1048-9002 J9 J VIB ACOUST JI J. Vib. Acoust.-Trans. ASME PD OCT PY 1994 VL 116 IS 4 BP 573 EP 577 DI 10.1115/1.2930466 PG 5 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA PP300 UT WOS:A1994PP30000024 ER PT J AU SANDISON, J WOOLAVER, D DIPPER, M RICE, M AF SANDISON, J WOOLAVER, D DIPPER, M RICE, M TI SEA TRIALS OF THE SWATH SHIP USNS VICTORIOUS (T-AGOS-19) SO MARINE TECHNOLOGY AND SNAME NEWS LA English DT Article AB In 1986 the design of the Navy's first large SWATH (small waterplane area twin hull) ship was completed. Designated the T-AGOS 19 Class, these vessels were designed to operate comfortably in high latitudes during winter months. The T-AGOS 23 Classes represent one of the greatest departures in naval surface ship design in the past century. In 1989 extensive confirmation sea trials on USNS Victorious (T-AGOS 19) were required by the Chief Engineer of the Navy. T-AGOS 19 was built by McDermott Shipyards in Amelia, Louisiana and was delivered to the Navy in August of 1991. An extensive Core Data Acquisition System (CDAS) was installed to support seakeeping, ship motions, hydrodynamic, structural, and acoustic trials. The trials were continual from the winter of 1991/92 in the North Atlantic through winter of 1992/93 in the North Pacific, and finished with standardization trials off Hawaii in April of 1993. An extensive amount of trials data has been generated, the analysis of which is still in process. This paper is an overview of the trials and a presentation (preliminary) of some of the results. The Victorious has proven to be a very seakindly ship with motions that allow one to comfortably work at a computer station in sea state 7. RP SANDISON, J (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0025-3316 J9 MAR TECHNOL SNAME N JI Mar. Technol. Sname News PD OCT PY 1994 VL 31 IS 4 BP 245 EP 257 PG 13 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA PM412 UT WOS:A1994PM41200001 ER PT J AU MICHAEL, TS QUINT, T AF MICHAEL, TS QUINT, T TI SPHERE OF INFLUENCE GRAPHS - EDGE DENSITY AND CLIQUE SIZE SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article DE PROXIMITY GRAPHS; INTERSECTION GRAPHS AB Let X = {X(1),...,X(n)} be a set of n points (n greater than or equal to 2) in the metric space M. Let r(i) denote the minimum distance between X(i) and any other point in X. The closed ball (B) over bar(i) with center X(i) and radius r(i) is the closed sphere of influence at X(i). The closed sphere of influence graph CSIG (M, X) has vertex set X with distinct vertices X(i) and X(j) adjacent provided (B) over bar(i) boolean AND (B) over bar(j) not equal 0. The graph G is an M-CSIG provided G is isomorphic to CSIG(M, X) for some set X of points in M. We prove that, for any metric space M, the clique number is bounded over the class of M-CSIGs if and only if there is a constant (C) over bar, so that the inequality \E\ less than or equal to (C) over bar\V\ holds whenever G = (V, E) is an M-CSIG. The proof uses Ramsey's Theorem, We also prove that if M = (R(d),rho) is a d-dimensional Minkowski space, then (C) over bar less than or equal to 5(d) - 3/2. C1 YALE UNIV,DEPT OPERAT RES,NEW HAVEN,CT 06520. RP MICHAEL, TS (reprint author), USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402, USA. NR 17 TC 13 Z9 13 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD OCT PY 1994 VL 20 IS 7 BP 19 EP 24 DI 10.1016/0895-7177(94)90067-1 PG 6 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA PN562 UT WOS:A1994PN56200003 ER PT J AU LEE, EU AF LEE, EU TI THERMAL-MECHANICAL FATIGUE OF TI-48AL-2V ALLOY LAND ITS COMPOSITE SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID THERMOMECHANICAL FATIGUE AB Thermal-mechanical fatigue (TMF) and isothermal fatigue (IF) of a Ti-48Al-2V alloy and its composite, reinforced with TiB2 particles, were studied. In-phase TMF testing was conducted under the condition of a minimum temperature T-min = 100 degrees C and a maximum temperature T-max which ranged from 750 degrees C to 1400 degrees C. The applied cyclic stress ranges were 2.8 to 28 MPa and 4.2 to 42 MPa. The IF tests were carried out at a T-max. The TMF and IF lives are longer for lower T-max sind for smaller stress ranges in both the matrix alloy and its composite. The IF life at a given T-max is shorter than the TMF life in the matrix alloy at all temperatures employed and in the composite only at higher temperatures. At lower temperatures, the TMF and IF lives are essentially the same in the composite. The resistance to TMF is similar in the matrix alloy and the composite, but the IF resistance is greater in the composite than in the matrix alloy. The proposed TMF mechanism is nucleation and growth of voids on interlamellar plate, twin, and grain boundaries; their interlamellar, translamellar, and intergranular linkage; intergranular separation; and disintegration of lamellar structure. RP LEE, EU (reprint author), USN,CTR AIR WARFARE,AIRCRAFT DIV WARMINSTER,WARMINSTER,PA 18974, USA. NR 24 TC 8 Z9 8 U1 1 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD OCT PY 1994 VL 25 IS 10 BP 2207 EP 2212 DI 10.1007/BF02652321 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PH400 UT WOS:A1994PH40000014 ER PT J AU AMUNDSON, DE WEISS, PJ AF AMUNDSON, DE WEISS, PJ TI PNEUMONIA IN MILITARY RECRUITS SO MILITARY MEDICINE LA English DT Article AB Lower respiratory disease is a major source of morbidity in military recruits, with hospitalization rates for pneumonia more than 30 times that of the non-recruit population. The etiologic agent remains unknown in over 75% of cases. This study prospectively examined the etiology of pneumonia among recruits at Naval Training Center, San Diego, California. Recruits presenting with cough, fever, or shortness of breath and pulmonary infiltrates on chest X-ray were eligible for enrollment. A standardized scoring form and focused physical exam were completed on each subject. Sputum specimens were obtained for Gram's stain and culture, DNA probing for Legionella and Mycoplasma species, and direct fluorescent antibody staining for Legionella. Acute and convalescent serologies were performed for adenovirus, influenza A and B, Mycoplasma pneumoniae, Chlamydia group, and respiratory syncytial virus. Of 110 eligible patients, 100 consented to enrollment and 75 patients completed the study. Etiologic diagnoses were obtained in 40 of the patients (53%). M. pneumoniae, Haemophilus influenzae, and viruses accounted for the majority of infections. Mixed infections were seen in six patients. Forty-seven percent of patients had no diagnosis established. Pneumonia in this series of military recruits was frequently caused by M. pneumoniae and H. influenzae. Fifty percent of cases were undiagnosed with routinely available laboratory methods. Further studies are warranted to more clearly define the etiologic agents of recruit pneumonia and the utility of prophylactic measures. RP AMUNDSON, DE (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 12 Z9 13 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD OCT PY 1994 VL 159 IS 10 BP 629 EP 631 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA QB527 UT WOS:A1994QB52700001 PM 7870317 ER PT J AU GORDIS, JH AF GORDIS, JH TI AN ANALYSIS OF THE IMPROVED REDUCED SYSTEM (IRS) MODEL-REDUCTION PROCEDURE SO MODAL ANALYSIS-THE INTERNATIONAL JOURNAL OF ANALYTICAL AND EXPERIMENTAL MODAL ANALYSIS LA English DT Article AB The Improved Reduced System (IRS) is a model reduction method which is gaining acceptance in the structural dynamics community due to its ease of application and its improved accuracy over the static (Guyan) reduction. The IRS method gains its improved accuracy over the static reduction due to its approximation of the inertia forces missing in the static reduction. Experience has shown, however, that in orthogonality calculations with mode shapes obtained from a modal test, the reduced mass matrix as calculated from the IRS method may fail to produce results comparable to those calculated using the reduced mass matrix from the static reduction. A new derivation of the IRS method, starting from the exact structural reduction relationship, demonstrates that the method must comply with a fundamental restriction in the choice of omitted model coordinates, a restriction associated with classical reduction methods which attempt to correct for missing inertia forces. Compliance with the restriction is shown to produce improved orthogonality calculations with test mode shapes. Examples are included that demonstrate the difficulty with the method, as well as its resolution as dictated by the aforementioned restriction. RP GORDIS, JH (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 14 TC 7 Z9 7 U1 1 U2 2 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 1066-0763 J9 MODAL ANAL JI Modal Anal.-Int. J. Analyt. Exp. Modal Anal. PD OCT PY 1994 VL 9 IS 4 BP 269 EP 285 PG 17 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA RN120 UT WOS:A1994RN12000004 ER PT J AU HIRSCHBERG, PA FRITSCH, JM AF HIRSCHBERG, PA FRITSCH, JM TI A STUDY OF THE DEVELOPMENT OF EXTRATROPICAL CYCLONES WITH AN ANALYTIC MODEL .2. SENSITIVITY TO TROPOSPHERIC STRUCTURE AND ANALYSIS OF HEIGHT TENDENCY DYNAMICS SO MONTHLY WEATHER REVIEW LA English DT Article ID EASTERN-UNITED-STATES; DIABATIC PROCESSES; BAROCLINIC WAVES; CYCLOGENESIS; DISTURBANCES; CIRCULATION; DIAGNOSIS; GROWTH; EVENT; COAST AB An analytic quasigeostrophic model is used to examine the sensitivity of type B cyclogenesis to the vertical structure of the troposphere given a particular stratospheric temperature configuration. it is found that there is an optimal tropospheric configuration that produces the largest negative height tendency at the center of the 1000-mb model cyclone. Based on the response of the 1000-mb height tendencies, altering the baroclinicity in the model planetary boundary layer (PBL) does not significantly affect the instantaneous quasigeostrophic dynamics of the deep atmosphere. Rather, the PBL temperature anomalies affect the development of lower-tropospheric model lows by hydrostatically shifting or steering the cyclone centers to locations beneath more (or less) favorable deep atmospheric quasigeostrophic conditions for development. Diagnostic analyses of three individual stratospheric-tropospheric model configurations are also performed to examine the dynamics that drive the height (pressure) tendency field. Generally, the analytic model findings confirm previous observational and numerical investigations of height tendency mechanisms and support the notion of a stratospheric level of insignificant dynamics. In the optimal development case, the 1000-mb low is located almost directly underneath the region of strongest 200-mb temperature advection associated with a tropopause undulation (potential vorticity anomaly). This strong lower-stratospheric warm advection instantaneously overwhelms adiabatic cooling in the stratosphere and troposphere so that there are height falls over and downstream of the 1000-mb low. When the static stability is lowered in the troposphere and raised in the stratosphere to realistic ''warm-sector'' values, the vertical motion increases, and the local warming in the stratosphere and cooling in the troposphere decrease. The reduced tropospheric cooling results in larger net local column warming that intensifies the 1000-mb height falls. The intensified vertical circulation also acts to amplify the tropopause undulation. As the amplitude of the undulation increases, characteristics of the occlusion process can be identified. C1 PENN STATE UNIV,DEPT METEOROL,UNIVERSITY PK,PA 16802. RP HIRSCHBERG, PA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR HS,MONTEREY,CA 93943, USA. NR 41 TC 2 Z9 4 U1 0 U2 4 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD OCT PY 1994 VL 122 IS 10 BP 2312 EP 2330 DI 10.1175/1520-0493(1994)122<2312:ASOTDO>2.0.CO;2 PG 19 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PG580 UT WOS:A1994PG58000006 ER PT J AU GROSSMAN, K PECKERAR, M AF GROSSMAN, K PECKERAR, M TI ACTIVE CURRENT LIMITATION FOR COLD-CATHODE FIELD EMITTERS SO NANOTECHNOLOGY LA English DT Letter AB In this letter the effect of active current limitation on the reliability and performance of cold-cathode emitters produced using nanometric fabrication techniques is described. MOSFET limiters were compared along with resistor-limiters and unlimited field emission devices. It is shown that active limiters have the ability to quench discharges before serious damage occurs. C1 USN,RES LAB,SURFACE & INTERFACE SCI BRANCH,WASHINGTON,DC 20375. RP GROSSMAN, K (reprint author), UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20772, USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0957-4484 J9 NANOTECHNOLOGY JI Nanotechnology PD OCT PY 1994 VL 5 IS 4 BP 179 EP 182 DI 10.1088/0957-4484/5/4/001 PG 4 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied SC Science & Technology - Other Topics; Materials Science; Physics GA QP884 UT WOS:A1994QP88400001 ER PT J AU SOHN, SY AF SOHN, SY TI MONITORING DECLINING QUALITY OF AMMUNITION STOCKPILE UNDER STEP STRESS SO NAVAL RESEARCH LOGISTICS LA English DT Article ID MODELS AB Most ammunition is produced long before its ultimate consumption and stored in a series of different depots for a considerably long period of time. During storage, the quality of the ammunition stockpile deteriorates proportionally to the condition of the depots. We view different conditions associated with a series of depots as step stress. A random effects logistic regression model is employed to predict the quality of ammunition stockpile in terms of the routing information such as a series of locations and duration of storage of ammunition lots. The resultant prediction model can be used to determine the appropriate time for reorder or renovation of ammunition before the quality becomes substandard. An example is given to illustrate the implementation procedure of the prediction model suggested in this article. (C) 1994 John Wiley & Sons, Inc. RP SOHN, SY (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943, USA. NR 14 TC 6 Z9 6 U1 1 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD OCT PY 1994 VL 41 IS 6 BP 707 EP 718 DI 10.1002/1520-6750(199410)41:6<707::AID-NAV3220410603>3.0.CO;2-R PG 12 WC Operations Research & Management Science SC Operations Research & Management Science GA PH912 UT WOS:A1994PH91200002 ER PT J AU TRAN, JT KISER, WR AF TRAN, JT KISER, WR TI TIMING OF THE POSTPARTUM PAPANICOLAOU SMEAR SO OBSTETRICS AND GYNECOLOGY LA English DT Letter RP TRAN, JT (reprint author), USN HOSP,DEPT FAMILY MED,2080 CHILD ST,JACKSONVILLE,FL 32214, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0029-7844 J9 OBSTET GYNECOL JI Obstet. Gynecol. PD OCT PY 1994 VL 84 IS 4 BP 638 EP 638 PN 1 PG 1 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA PJ351 UT WOS:A1994PJ35100032 PM 8090408 ER PT J AU SCHMIDT, WAC DAIVS, JP AF SCHMIDT, WAC DAIVS, JP TI GENERATION OF NEURAL-NETWORK DECISION SURFACES - A PATTERN-CLASSIFICATION EXAMPLE SO OPTICAL ENGINEERING LA English DT Article DE PATTERN CLASSIFICATION; NEURAL NETWORK; INFRARED; DECISION SURFACE; MATCHED FILTER; PERCEPTRON AB The problem of classifying regions in an IR cloud scene is considered using the conventional matched filter, the perceptron, and a class of neural networks known as the multilayered perception (MLP). The purpose is to determine if neural network technology is applicable for a remote-sensing application. Another goal is to illustrate graphically how the MLP generates the decision surfaces. Examples are given to show that the MLP is better than other approaches if the application requires nonlinear decision surfaces for classification. A three-dimensional classification problem is given to illustrate the MLP hidden-layer operation. The resulting nonlinear decision surface, which achieves 100% correct classification, is displayed. A seven-dimensional classification problem is given to further illustrate the need for a nonlinear decision surface. Finally, an 128 x 128-pixel IR cloud-scene example with remote objects provides a more practical indication of the benefits of MLP for point-object classification. In addition, these examples provide a tutorial on how the internal operations of the MLP produce the required decision surfaces. The results provide a rationale for consideration of the MLP for other remote-sensing applications. RP SCHMIDT, WAC (reprint author), USN,CTR AIR WARFARE,AIRCRAFT DIV WARMINSTER,DEPT MISSION AVION TECHNOL,WARMINSTER,PA 18974, USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD OCT PY 1994 VL 33 IS 10 BP 3388 EP 3397 DI 10.1117/12.179387 PG 10 WC Optics SC Optics GA PM148 UT WOS:A1994PM14800034 ER PT J AU HANSON, F POIRIER, P AF HANSON, F POIRIER, P TI EFFICIENT INTRACAVITY FREQUENCY-DOUBLING OF A HIGH-REPETITION-RATE DIODE-PUMPED ND-YAG LASER SO OPTICS LETTERS LA English DT Article ID CONTINUOUS-WAVE; HIGH-POWER AB Efficient operation of a pulsed, high-repetition-rate diode-pumped and intracavity frequency-doubled Nd:YAG laser is reported. A 3-mm-diameter laser rod was side-pumped with a 5-bar stack of high-duty-cycle l-cm diode arrays. The average Q-switched power at 1.06 mu m was 3.8 at at 1.33 kHz, and more than 4 W at 0.532 mu m was obtained through intracavity frequency doubling with LiB3O5. RP HANSON, F (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT,CODE 843,SAN DIEGO,CA 92152, USA. NR 12 TC 7 Z9 7 U1 1 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 1 PY 1994 VL 19 IS 19 BP 1526 EP 1528 DI 10.1364/OL.19.001526 PG 3 WC Optics SC Optics GA PJ265 UT WOS:A1994PJ26500008 PM 19855572 ER PT J AU REEDY, E SIMONSON, L ZABLEN, L AF REEDY, E SIMONSON, L ZABLEN, L TI HOMOLOGY AMONG TREPONEMA-DENTICOLA PLASMIDS SO ORAL MICROBIOLOGY AND IMMUNOLOGY LA English DT Article DE TREPONEMA DENTICOLA; PLASMID; PERIODONTITIS; SINGLE-STRANDED DNA ID PERIODONTITIS; ANTIBODIES; PLAQUE; DNA AB Three of 16 isolates of Treponema denticola were found to contain small (2.0-2.7 kb) cryptic plasmids. These were pTD1 from T. denticola ATCC 33520, pTD2 from strain T32A, and pTD3 from strain D3A1. These plasmids were characterized by restriction mapping and cloned into E. coli plasmid pUC19. Extensive homology between these plasmids was revealed by Southern blot, and single-stranded DNA regions were found by neutral Southern blots and S-1 nuclease mapping. These plasmids were not found in serovars usually associated with human periodontal disease nor are they universal in all T. denticola strains and serovars. C1 USN,DENT RES INST,GREAT LAKES,IL 60088. GEOCENTERS INC,FT WASHINGTON,MD. NR 19 TC 4 Z9 4 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0902-0055 J9 ORAL MICROBIOL IMMUN JI Oral Microbiol. Immunol. PD OCT PY 1994 VL 9 IS 5 BP 305 EP 309 DI 10.1111/j.1399-302X.1994.tb00076.x PG 5 WC Dentistry, Oral Surgery & Medicine; Immunology; Microbiology SC Dentistry, Oral Surgery & Medicine; Immunology; Microbiology GA PK278 UT WOS:A1994PK27800009 PM 7808774 ER PT J AU OBRIEN, F AF OBRIEN, F TI STANDARDIZATION OF NOMENCLATURE IN THE SPATIAL PDI MODEL SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article ID DENSITY INDEX MODEL; POPULATION-DENSITY; FINITE POPULATIONS AB This paper establishes a nomenclature for the mathematical system of approximately 100 functions, mappings, and relations comprising the spatial PDI model. RP OBRIEN, F (reprint author), USN,UNDERSEA WARFARE CTR DIV,CODE 2211,B 1171-1,1176 HOWELL ST,NEWPORT,RI 02841, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD OCT PY 1994 VL 79 IS 2 BP 923 EP 927 PG 5 WC Psychology, Experimental SC Psychology GA PQ681 UT WOS:A1994PQ68100042 ER PT J AU JACOBS, VL COOPER, J HAAN, SL AF JACOBS, VL COOPER, J HAAN, SL TI INFLUENCE OF RELAXATION PHENOMENA IN THE UNIFIED DESCRIPTION OF RESONANT AND NONRESONANT RADIATIVE TRANSITIONS SO PHYSICAL REVIEW A LA English DT Article ID DIELECTRONIC SATELLITE SPECTRA; CHANNELING RADIATION; AUTOIONIZING STATES; LASER FIELDS; COLLISIONAL REDISTRIBUTION; SPONTANEOUS EMISSION; CHARGED-PARTICLES; DENSITY-MATRIX; MEV ELECTRONS; RECOMBINATION AB A comprehensive quantum-mechanical description of resonant and nonresonant radiative transitions in complex electronic systems is developed, using a density-matrix approach. Specific applications are made to the unified treatment of radiative and dielectronic recombination of electrons with many-electron ions in high-temperature plasmas and to the unified treatment of transverse bound-bound and free-bound radiative transitions of energetic electrons channeled in crystal lattices. Both time-independent (resolvent-operator) and time-dependent (equation-of-motion) formulations of the density-matrix approach are presented. Liouville-space projection-operator techniques, which have been developed in the nonequilibrium quantum-statistical-mechanics description of relaxation phenomena, are employed. Self-consistent treatments are achieved for the excited-level populations and the spectral-line shapes. Applications are discussed for the broadening of atomic spectral lines by autoionization processes, radiative transitions, charged-particle collisions, and the action of the plasma electric microfields, and also for electron-channeling-radiation broadening by electron-electron, electron-photon, and electron-phonon interactions in a crystal lattice. The unified treatment of resonant and nonresonant radiative transitions is accomplished by means of a partition of the ''relevant'' Liouville space into separate subspaces corresponding to discrete resonance and nonresonant continuum states of the electronic system of interest. Although only single-photon processes are considered and only lowest-order quantum-electrodynamical perturbation theory is explicitly evaluated for the electron interaction with the radiation field, the general resolvent-operator and propagator formulations that are presented in this investigation can be applied to the descrption of multiphoton processes and, with the adoption of a suitable renormalization program, to the incorporation of radiative corrections to the transition probabilities. C1 UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. CALVIN COLL,DEPT PHYS,GRAND RAPIDS,MI 49546. RP JACOBS, VL (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,CODE 6693,WASHINGTON,DC 20375, USA. NR 81 TC 30 Z9 30 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT PY 1994 VL 50 IS 4 BP 3005 EP 3038 DI 10.1103/PhysRevA.50.3005 PG 34 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PL627 UT WOS:A1994PL62700035 ER PT J AU JACOBSEN, RL EHRLICH, AC TRITT, TM GILLESPIE, DJ AF JACOBSEN, RL EHRLICH, AC TRITT, TM GILLESPIE, DJ TI EFFECT OF A MAGNETIC-FIELD ON A VIBRATING REED WITH ANISOTROPIC SUSCEPTIBILITY SO PHYSICAL REVIEW B LA English DT Article AB A magnetic field may alter the flexural resonant frequencies of a vibrating reed that possesses an anisotropic magnetic susceptibility. The phenomenon's magnitude is a function of the field strength, the length of the reed, the radius of gyration of the reed's cross section, the Young's modulus of the material, the vibrational mode observed, the magnetic susceptibility tensor, and the field's orientation relative to the principal susceptibility directions and the reed's plane of vibration. This effect can allow a direct and extremely sensitive measure of magnetic anisostropy of nonferromagnetic materials. RP JACOBSEN, RL (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 23 TC 3 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9208 EP 9214 DI 10.1103/PhysRevB.50.9208 PG 7 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200028 ER PT J AU KAO, CC CHEN, CT JOHNSON, ED HASTINGS, JB LIN, HJ HO, GH MEIGS, G BROT, JM HULBERT, SL IDZERDA, YU VETTIER, C AF KAO, CC CHEN, CT JOHNSON, ED HASTINGS, JB LIN, HJ HO, GH MEIGS, G BROT, JM HULBERT, SL IDZERDA, YU VETTIER, C TI DICHROIC INTERFERENCE EFFECTS IN CIRCULARLY-POLARIZED SOFT-X-RAY RESONANT MAGNETIC SCATTERING SO PHYSICAL REVIEW B LA English DT Note ID EXCHANGE SCATTERING; ABSORPTION; EDGES; MONOCHROMATORS; MULTILAYERS; ATOMS; IRON; FE AB Dichroic interference effects were observed in circularly polarized soft-x-ray reflectivity at the Co L2,3 edges of a magnetic multilayer. The data show a maximum asymmetry ratio of 80%, greater than the degree of circular polarization of the incident light, a changeover in the dichroic characteristics with increasing grazing angle, and an inverted interference pattern in the angular dependence of the asymmetry ratio. These observations are explained successfully by a classical electromagnetic model calculation which includes the complete polarization state of the incident light and spatial interference within the multilayer. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. USN,RES LAB,WASHINGTON,DC 20375. EUROPEAN SYNCHROTRON RADIAT FACIL,F-38043 GRENOBLE,FRANCE. RP KAO, CC (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 30 TC 116 Z9 118 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9599 EP 9602 DI 10.1103/PhysRevB.50.9599 PG 4 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200082 ER PT J AU JACOBSEN, RL TRITT, TM EHRLICH, AC GILLESPIE, DJ AF JACOBSEN, RL TRITT, TM EHRLICH, AC GILLESPIE, DJ TI MAGNETOELASTIC BEHAVIOR OF NBSE3 SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC-FIELD; TEMPERATURE; MAGNETOTHERMOPOWER AB We have used the vibrating-reed technique to investigate the magnetoelastic properties of NbSe 3 in an attempt to detect any contribution to stiffness from magnetic-field-assisted normal-to-charge-density-wave (CDW) carrier conversion below the material's lower CDW transition. For a magnetic-field transverse to the reed, we find the resonant frequency to decrease quadratically with field strength. However, the magnitude of this change is too large to be associated with carrier conversion. We can attribute the effect to the interaction between the field and the material's anisotropic magnetic susceptibility. This phenomenon is large enough to obscure attempts to detect stiffness contribution from carrier conversion. However, there exists the possibility of exploiting this effect to study the CDW through its influence on the magnetic susceptibility. C1 USN,RES LAB,MAT RES BRANCH,WASHINGTON,DC 20375. NR 19 TC 0 Z9 0 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 14 BP 10373 EP 10376 DI 10.1103/PhysRevB.50.10373 PG 4 WC Physics, Condensed Matter SC Physics GA PL951 UT WOS:A1994PL95100086 ER PT J AU SCHWARTZ, IB TRIANDAF, I AF SCHWARTZ, IB TRIANDAF, I TI CONTROLLING UNSTABLE STATES IN REACTION-DIFFUSION SYSTEMS MODELED BY TIME-SERIES SO PHYSICAL REVIEW E LA English DT Article ID ORBITS; LASER AB We introduce an algorithm for controlling unstable states of a spatiotemporal system modeled by a time series. Control is achieved by adjusting an external parameter at the boundary. Our time series is taken as the concentration from an experiment modeled by a reaction-diffusion system. It is shown that unstable states can be maintained by performing fluctuations of the concentration at the boundaries, while monitoring the dynamics from an interior spatial point. RP USN, RES LAB, DIV PLASMA PHYS, SPECIAL PROJECT NONLINEAR SCI, CODE 67003, WASHINGTON, DC 20375 USA. RI Schwartz, Ira/A-8073-2009 NR 14 TC 8 Z9 8 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP 2548 EP 2552 DI 10.1103/PhysRevE.50.2548 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800026 ER PT J AU CARROLL, TL AF CARROLL, TL TI SYNCHRONIZING CHAOTIC SYSTEMS USING FILTERED SIGNALS SO PHYSICAL REVIEW E LA English DT Article ID CIRCUITS AB The concept of the synchronizing of cascaded chaotic systems may be extended to cases where the driving signal has been altered by a tilter, and reconstructed at the response system. Certain components are subtracted from the driving signal at the transmitter, and added back in at the receiver in a process using a feedback loop at the receiver. The drive and response systems are not identical for this experiment, although they are effectively identical when they are synchronized. This type of synchronization is demonstrated in both numerical simulations and circuit experiments. RP USN, RES LAB, WASHINGTON, DC 20375 USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 28 TC 31 Z9 34 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP 2580 EP 2587 DI 10.1103/PhysRevE.50.2580 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800029 ER PT J AU HAFIZI, B SPRANGLE, P HIRSHFIELD, JL AF HAFIZI, B SPRANGLE, P HIRSHFIELD, JL TI ELECTRON-BEAM QUALITY IN A CYCLOTRON AUTORESONANCE ACCELERATOR SO PHYSICAL REVIEW E LA English DT Article ID RESONANCE LASER ACCELERATOR; MICROWAVE ACCELERATOR; RADIATION; MODES AB An analysis of the electron beam dynamics in a cyclotron autoresonance accelerator (CARA) is presented. The beam is to be employed in harmonic convertor experiments to generate high-power centimeter-wavelength microwaves, with potential application as a driver for a next-generation electron-positron collider. The presentation will highlight the quality of the electron beam generated by this acceleration mechanism. For beam energies up to about 1 MeV and beam currents up to 50 A, the evolution of the axial velocity spread is determined by a self-consistent numerical solution of the governing nonlinear equations for an ensemble of electrons with finite initial emittance. It is shown that the requirement for an up-tapered guide magnetic field to maintain resonance leads to a diminution of the axial velocity (due to the mirror effect) that eventually causes the acceleration to cease. It is also shown that under some conditions a CARA can have an acceleration efficiency approaching 100%. An estimate is given, and examples are considered for the deterioration of a CARA beam's spatiotemporal character arising from self-fields. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. OMEGA P INC,NEW HAVEN,CT 06520. YALE UNIV,NEW HAVEN,CT 06511. RP HAFIZI, B (reprint author), ICARUS RES,POB 30780,BETHESDA,MD 20824, USA. NR 17 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP 3077 EP 3086 DI 10.1103/PhysRevE.50.3077 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800089 ER PT J AU VOHRA, S FABINY, L AF VOHRA, S FABINY, L TI INDUCED STOCHASTIC RESONANCE NEAR A SUBCRITICAL BIFURCATION SO PHYSICAL REVIEW E LA English DT Note ID SYSTEMS AB The effects of variations in potential barrier height on stochastic resonance in a multistable system are investigated in this experimental work. It is found that small reductions in the potential barrier height tend to shift the stochastic resonance peak to lower values of input noise intensity. For demonstration purposes the work relies on the destabilizing shift produced by near-resonant perturbations on bistable subcritical bifurcations. It is proposed that multistable systems may take advantage of induced stochastic resonance in order to improve the signal-to-noise ratio, especially in cases where only a limited or fixed amount of input noise is available. RP VOHRA, S (reprint author), USN,RES LAB,CODE 5670,WASHINGTON,DC 20375, USA. NR 13 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP R2391 EP R2394 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800001 ER PT J AU GARREN, DA CHEN, J AF GARREN, DA CHEN, J TI LORENTZ SELF-FORCES ON CURVED CURRENT LOOPS SO PHYSICS OF PLASMAS LA English DT Article ID INTERPLANETARY MAGNETIC CLOUDS; FLUX TUBES; CORONAL TRANSIENTS; EQUILIBRIUM; PLASMA; FIELD AB A derivation is presented for the Lorentz self-force arising from the interaction of a slender current loop of arbitrary shape with its own magnetic field. The self-force on any loop segment depends explicitly on the global shape of the remainder of the loop. Calculations of the self-force are presented for various model loops. For loops having small to moderate noncircularity, it is shown that the self-force on a segment with local major (R) and minor (a) radii is approximately that for an axisymmetric torus having uniform R and a. These properties of the self-force critically influence the equilibrium and dynamics of thin current loops in solar and astrophysical plasmas. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. NR 35 TC 28 Z9 28 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1994 VL 1 IS 10 BP 3425 EP 3436 DI 10.1063/1.870491 PG 12 WC Physics, Fluids & Plasmas SC Physics GA PL630 UT WOS:A1994PL63000029 ER PT J AU HUBA, JD GROSSMANN, JM OTTINGER, PF AF HUBA, JD GROSSMANN, JM OTTINGER, PF TI HALL MAGNETOHYDRODYNAMIC MODELING OF A LONG-CONDUCTION-TIME PLASMA OPENING SWITCH SO PHYSICS OF PLASMAS LA English DT Article ID MAGNETIC-FIELD PENETRATION; LARGE-LARMOR-RADIUS; BARIUM RELEASES; INSTABILITY; SIMULATION; STORAGE; DENSITY AB The dynamics of long-conduction-time (tau(c) approximately 1 mus) plasma opening switches (POS) is studied using magnetohydrodynamic (MHD) theory, including the Hall term. Plasma switches with initial electron densities of n(e) = 10(14)-10(16) CM-3 are modeled; these densities are appropriate to recent experiments carried out at the Naval Research Laborato using the Hawk generator (800 kA, 1.2 mus). The conduction times obtained from the simulation studies are in the range tau(c) congruent-to 0.4-2.0 mus. The POS plasma is strongly redistributed by the penetrating magnetic field. As the field penetrates, it pushes the plasma both axially and radially (i.e., toward the anode and cathode). In the higher-density regime (n(e)>10(15) CM-3), Hall effects do not play a significant role. The magnetic field acts as a snowplow, sweeping up and compressing the plasma as it propagates through the POS plasma. In the lower-density regime (n(e)<10(15) CM-3) , Hall effects become important in two ways: the conduction time is less than that expected from ideal MHD, and the POS plasma becomes unstable as the magnetic field penetrates, leading to finger-like density structures. The instability is the unmagnetized ion Rayleigh-Taylor instability and is driven by the magnetic force accelerating the plasma. The structuring of the plasma further decreases the conduction time and causes the penetrating magnetic field to have a relatively broad front in comparison to EMHD simulations (i.e., V(i) = 0). The simulation results are consistent with experimental data for conduction currents 300-800 kA. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 35 TC 49 Z9 54 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1994 VL 1 IS 10 BP 3444 EP 3454 DI 10.1063/1.870493 PG 11 WC Physics, Fluids & Plasmas SC Physics GA PL630 UT WOS:A1994PL63000031 ER PT J AU SITZMANN, ME AF SITZMANN, ME TI HIGH-MELTING AROMATIC NITRATE ESTERS - ETHANOLAMINE DERIVATIVES OF POLYNITROAROMATIC COMPOUNDS SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article AB The preparation and properties of high-melting aromatic nitrate esters are described. An objective of the study is to provide nitrate esters that exhibit good short-term stability at temperatures of 150 degrees C and above. RP SITZMANN, ME (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903, USA. NR 11 TC 3 Z9 4 U1 0 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD OCT PY 1994 VL 19 IS 5 BP 249 EP 254 DI 10.1002/prep.19940190507 PG 6 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA QD845 UT WOS:A1994QD84500006 ER PT J AU MATTHEWS, JH PATTABIRAMAN, N WARD, KB MANTILE, G MIELE, L MUKHERJEE, AB AF MATTHEWS, JH PATTABIRAMAN, N WARD, KB MANTILE, G MIELE, L MUKHERJEE, AB TI CRYSTALLIZATION AND CHARACTERIZATION OF THE RECOMBINANT HUMAN CLARA CELL 10-KDA PROTEIN SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE HUMAN CLARA CELL 10-KDA PROTEIN; X-RAY DIFFRACTION; PHOSPHOLIPASE A(2) INHIBITOR ID ANTIINFLAMMATORY PEPTIDES ANTIFLAMMINS; PLATELET-ACTIVATING-FACTOR; C2221 CRYSTAL FORM; PHOSPHOLIPASE-A2 ACTIVITY; PROGESTERONE-BINDING; OXIDIZED UTEROGLOBIN; RABBIT UTEROGLOBIN; KDA PROTEIN; EXPRESSION; RESOLUTION AB Crystals of recombinant human Clara cell 10-kDa protein were grown both from ammonium sulfate and polyethylene glycol (PEG) solutions. Crystals grown from ammonium sulfate solution have been characterized by X-ray diffraction studies as monoclinic with the space group C2 and lattice constants a = 69.2 Angstrom, b = 83.0 Angstrom, c = 58.3 Angstrom, and beta = 99.7 degrees. The monoclinic crystals diffract to beyond 2.5 Angstrom. Some of the crystals grown from PEG were of a similar habit to those grown from ammonium sulfate, but others were triclinic with the space group P1 and cell constants a = 40.3 Angstrom, b = 46.3 Angstrom, c = 51.3 Angstrom, alpha = 117.7 degrees, beta = 102.3 degrees, and gamma = 71.4 degrees. These crystals diffract to beyond 3.2 Angstrom. (C) 1994 Wiley-Liss, Inc.* C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824. NICHHD,HUMAN GENET BRANCH,GENET DEV SECT,BETHESDA,MD 20892. NR 51 TC 12 Z9 12 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-3585 J9 PROTEINS JI Proteins PD OCT PY 1994 VL 20 IS 2 BP 191 EP 196 DI 10.1002/prot.340200209 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PM792 UT WOS:A1994PM79200009 PM 7846028 ER PT J AU KEENAN, FP FOSTER, VJ ROCHE, IJ MOHAN, M WIDING, KG AF KEENAN, FP FOSTER, VJ ROCHE, IJ MOHAN, M WIDING, KG TI CA-X-LINE RATIOS IN SOLAR-FLARES SO SOLAR PHYSICS LA English DT Article ID STRENGTHS; SPECTRUM; SUN; DIAGNOSTICS; SODIUM; SPECTROGRAPH; CALCIUM; SKYLAB; IONS; IV AB Theoretical Ca X electron temperature sensitive emission line ratios, derived using electron excitation rates interpolated from accurate R-matrix calculations, are presented for R(1) = I(419.74 Angstrom)/I(574.02 Angstrom), R(2) = I(411.65 Angstrom)/I(574.02 Angstrom), R(3) = I(419.74 Angstrom)/I(557.75 Angstrom), and R(4) = I(411.65 Angstrom)/I(557.75 Angstrom). A comparison of these with observational data for three solar flares, obtained by the Naval Research Laboratory's S082A slitless spectrograph on board Skylab, reveals good agreement between theory and observation for R(1) and R(3) in one event, which provides limited support for the accuracy of the atomic data adopted in the analysis. However, in the other flares the observed values of R(1) - R(4) are much larger than the theoretical high-temperature limits, which is probably due to blending of the 419.74 Angstrom line with CIV 419.71 Angstrom, and 411.65 Angstrom with possibly CIII 411.70 Angstrom. C1 UNIV DELHI,KIRORI MAL COLL,DEPT PHYS,DELHI 110007,INDIA. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 34 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD OCT PY 1994 VL 154 IS 2 BP 309 EP 315 DI 10.1007/BF00681101 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PY057 UT WOS:A1994PY05700006 ER PT J AU WITCZAK, SC GAITAN, M SUEHLE, JS PECKERAR, MC MA, DI AF WITCZAK, SC GAITAN, M SUEHLE, JS PECKERAR, MC MA, DI TI THE INTERACTION OF STOICHIOMETRY, MECHANICAL-STRESS, AND INTERFACE-TRAP DENSITY IN LPCVD SI-RICH SINX-SI STRUCTURES SO SOLID-STATE ELECTRONICS LA English DT Article ID SILICON-NITRIDE FILMS; ELECTRICAL-PROPERTIES; AMORPHOUS-SILICON; MOS CAPACITORS; PLASMA; STATES; DEPENDENCE; PRESSURE; DEVICES; SYSTEM AB Mechanical and electrical properties were correlated in LPCVD SiN(x)-Si structures through the characterization of six wafers patterned with MNS capacitors whose insulator films were deposited rich in Si under various processing conditions. The samples were measured for mechanical stress at the Si-SiN(x) interface with X-ray diffraction. The deposited SiN(x) films were measured for stoichiometry by Rutherford backscattering spectroscopy. Low-temperature C-V measurements were used for the first time to estimate Si-SiN(x) interface trap densities in the capacitors. The interface trap densities were confirmed with the aid of a model based on a numerical analysis of the capacitor small-signal response. The measurement results indicate that an increase in the Si/N ratio in the insulating films was accompanied by a decrease in the film tensile stress. Those SiN(x) films made sufficiently rich in Si were successfully deposited under compressive stress. Furthermore, a decrease in the magnitude of the stress was accompanied by a decrease in interface trap densities, suggesting that interfacial mechanical stress may be influential in the formation of Si-SiN(x) interface traps. Interface trap densities were lowest in those structures whose insulating films were deposited under compression. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. RP WITCZAK, SC (reprint author), NATL INST STAND & TECHNOL,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899, USA. NR 51 TC 17 Z9 17 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD OCT PY 1994 VL 37 IS 10 BP 1695 EP 1704 DI 10.1016/0038-1101(94)90216-X PG 10 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA NZ806 UT WOS:A1994NZ80600004 ER PT J AU DERE, KP AF DERE, KP TI SOLAR MASS-FLOW IN FINE-SCALE STRUCTURES SO SPACE SCIENCE REVIEWS LA English DT Review DE SUN; FLOWS; VELOCITIES ID HIGH-RESOLUTION TELESCOPE; X-RAY TELESCOPE; TRANSITION ZONE; CORONAL HOLES; QUIET SUN; CHROMOSPHERE; REGION; YOHKOH; JETS AB Observations of transient and steady velocities at chromospheric, transition region and coronal temperatures in the quiet Sun and coronal holes are reviewed. The relevance of fine-scale structures in governing the mass balance of the solar atmosphere is stressed. At present, a coherent picture of these mass flows does not exist. However, the current observational base of transition region and coronal velocity information is limited but should greatly improve with measurements from the SOHO satellite. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 40 TC 15 Z9 15 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 21 EP 30 DI 10.1007/BF00777837 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600005 ER PT J AU STERLING, AC SHIBATA, K MARISKA, JT AF STERLING, AC SHIBATA, K MARISKA, JT TI JETS AND BRIGHTENINGS GENERATED BY ENERGY DEPOSITION IN THE MIDDLE AND UPPER SOLAR CHROMOSPHERE SO SPACE SCIENCE REVIEWS LA English DT Review DE SUN; CHROMOSPHERE; HEATING; SPICULES ID X-RAY TELESCOPE; NUMERICAL SIMULATIONS; TRANSITION REGION; SPICULES; YOHKOH AB Numerical simulations of energy depositions in the middle and upper solar chromosphere result in ejection of chromospheric material into the corona and heating of the chromospheric gas. These simulations may be capable of describing some of the features seen by the soft X-ray telescope on board the Yohkoh satellite. C1 COMPUTAT PHYS INC, FAIRFAX, VA 22031 USA. NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 10 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 77 EP 80 DI 10.1007/BF00777845 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600013 ER PT J AU MOSES, D COOK, JW AF MOSES, D COOK, JW TI THE CORONAL CONTEXT OF TRANSITION REGION EXPLOSIVE EVENTS SO SPACE SCIENCE REVIEWS LA English DT Review DE TRANSITION REGION; CORONAL BRIGHT POINTS; CORONAL HEATING AB Transition region explosive events are observed throughout the quiet Sun and represent an interesting local heating phenomenon. The coronal counterparts of these events, if they exist, were not observed in a sounding rocket campaign dedicated to this objective. The coronal instrument complement on the SOHO spacecraft provides an opportunity to extend this search for the coronal counterparts of the transition region explosive events, as well as to explore the correspondence of explosive events with large scale coronal structures, such as with coronal dark lanes. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 81 EP 84 DI 10.1007/BF00777846 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600014 ER PT J AU KJELDSETHMOE, O CHENG, CC AF KJELDSETHMOE, O CHENG, CC TI THE EXTENSION OF EXPLOSIVE EVENTS FROM THE TRANSITION REGION TO THE CORONA SO SPACE SCIENCE REVIEWS LA English DT Review ID ZONE AB We describe the properties of high velocity events in the corona and upper transition region and propose that they are the same phenomenon as the well studied explosive events seen in the lower transition region around T=10(5) K. Furthermore, we discuss how the SOHO spectrometers, CDS and SUMER, may be used to check this conjecture. Magnetic reconnection has been considered a strong candidate for the physical mechanism causing explosive events. We present a phenomenological model showing how some of the observed properties of explosive events may be explained by reconnection occurring in small magnetic loops. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP UNIV OSLO, INST THEORET ASTROPHYS, OSLO 3, NORWAY. NR 14 TC 9 Z9 9 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 85 EP 88 DI 10.1007/BF00777847 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600015 ER PT J AU DAHLBURG, RB KARPEN, JT AF DAHLBURG, RB KARPEN, JT TI TURBULENT TRANSITION IN SOLAR SURGES SO SPACE SCIENCE REVIEWS LA English DT Review DE SOLAR SURGES; MAGNETOHYDRODYNAMICS; TURBULENCE ID INSTABILITY; VISCOSITY AB It has been suggested that a surge can be modelled as a jet travelling in a sheared magnetic field, and that the transition to turbulence of this ''MHD tearing jet'' can explain several key observed features. In this paper we present our preliminary results of the transition to turbulence via secondary instabilities of the MHD tearing jet. Our results confirm that turbulent transition can decelerate the surge, with decay times which compare well with surge data. Furthermore, we find that the turbulent MHD tearing jet forms magnetic field-aligned velocity filaments similar to those often observed in the surge flow field. RP USN, RES LAB, WASHINGTON, DC 20375 USA. RI Karpen, Judith/E-1484-2012 NR 8 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 93 EP 96 DI 10.1007/BF00777849 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600017 ER PT J AU LAMING, JM AF LAMING, JM TI ANALYSIS OF A REDSHIFTED PLASMA-FLOW OVER A SUNSPOT SO SPACE SCIENCE REVIEWS LA English DT Review DE SUN; UV; TRANSITION REGION; SUNSPOTS; HE ABUNDANCE ID HE-II; REGION AB The ultraviolet spectrum of a redshifted plasma flow appearing over a sunspot observed during the first flight of the High Resolution Telescope Spectrograph (HRTS I) is analysed, and interpreted as a radiatively cooling plasma. For most of the lines emitted from this plasma, the assumption of ionization equilibrium during the cooling is good. However for He II (and other ions with a single electron outside of closed shells), this is not the case. Integrating differential equations for the various ionization fractions of helium and the temperature allows an approximate determination of the abundance of helium relative to other elements whose lines appear in the spectrum of the plasma flow. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP SFA INC, LANDOVER, MD 20785 USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 107 EP 110 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600020 ER PT J AU ANTIOCHOS, SK AF ANTIOCHOS, SK TI MASS FLOWS IN CORONAL LOOPS SO SPACE SCIENCE REVIEWS LA English DT Review DE SUN; CORONA; UV, X-RAYS ID SOLAR TRANSITION REGION; DYNAMICS; LINES AB Although static loop models are often used to describe the structure of coronal loops, it is evident on both observational and theoretical grounds that mass motions play a crucial role in the physics of the corona and transition region. First we review the observations of emission-line broadening and wavelength shifts, which imply the presence of random motions and systematic downflows in coronal loops. Some discrepancies in the observations are discussed. It is argued that velocities due to gas pressure gradients are the most likely explanation for the observed flows. A number of models that have been proposed for these motions are reviewed. The implications of the various models on observations of the corona and transition region by SOHO are discussed. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7675, WASHINGTON, DC 20375 USA. RI Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 15 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 143 EP 148 DI 10.1007/BF00777858 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600026 ER PT J AU WU, ST SONG, MT CHENG, CC DRYER, M AF WU, ST SONG, MT CHENG, CC DRYER, M TI CORONAL HEATING DUE TO THE EMERGENCE OF MAGNETIC-FLUX SO SPACE SCIENCE REVIEWS LA English DT Review DE CORONAL HEATING ID MODEL AB A self-consistent time-dependent, two-dimensional MHD model with a realistic energy equation is developed to understand the origin of bright coronal emission accompanying the occurrence of a new bipolar magnetic region. The motivation for this study is the interpretation of anticipated observations to be made by the SOHO mission. C1 UNIV ALABAMA, DEPT MECH ENGN, HUNTSVILLE, AL 35899 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. NOAA, ERL, SPACE ENVIRONM LAB, BOULDER, CO 80303 USA. RP UNIV ALABAMA, CTR SPACE PLASMA & AERON RES, HUNTSVILLE, AL 35899 USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 167 EP 170 DI 10.1007/BF00777861 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600029 ER PT J AU SCHMIEDER, B WIIK, JE DERE, KP AF SCHMIEDER, B WIIK, JE DERE, KP TI HIERARCHY OF SPATIAL SCALES IN UV PROMINENCES SO SPACE SCIENCE REVIEWS LA English DT Review DE SUN; PROMINENCES; UV RADIATION ID SOLAR TRANSITION ZONE; HIGH-RESOLUTION TELESCOPE; FINE-STRUCTURE; QUIESCENT PROMINENCE; SPECTROGRAPH AB Ultraviolet spectra of a quiescent prominence observed with the High Resolution Telescope and Spectrograph (HRTS) are analyzed. Different techniques lead to greatly different spatial scales for the prominence structures. The UV spectra show strong variations in intensity and Doppler shift on scales larger than 1700 km. Spectroscopic diagnostics employing line intensity ratios indicate the existence of scales between 400 m to some hundred kilometers. We attempt to interpret various aspects of the prominence intensities and velocities with a multiple thread model. C1 ESTEC, ESA, SPACE SCI DEPT SC, 2200 AG NOORDWIJK, NETHERLANDS. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP OBSERV PARIS, DASOP, SECT MEUDON, F-90195 MEUDON, FRANCE. NR 12 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 175 EP 180 DI 10.1007/BF00777863 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600031 ER PT J AU SPADARO, D LETO, P ANTIOCHOS, SK AF SPADARO, D LETO, P ANTIOCHOS, SK TI OBSERVATIONAL EVIDENCE FOR NONEQUILIBRIUM IONIZATION IN THE SOLAR CORONA SO SPACE SCIENCE REVIEWS LA English DT Review DE SUN; CORONA; EUV LINES AB We investigate whether temperature sensitive EUV line ratios can be used as observational signatures for the presence of non-equilibrium ionization in transition region plasma. We compute the total intensity of some EUV lines of carbon and oxygen expected from coronal loop models with a steady-state flow and which are known to have significant departures from ionization equilibrium, selecting lines whose intensity ratios are useful for deducing the electron temperature in the coronal plasma. We calculate the intensity ratios with and without the approximation of ionization equilibrium, in order to determine the effects of any deviations from equilibrium on the numerical values of the line ratios examined. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP OSSERV ASTROFIS CATANIA, CATANIA, ITALY. RI Antiochos, Spiro/D-4668-2012; OI Antiochos, Spiro/0000-0003-0176-4312; Leto, Paolo/0000-0003-4864-2806 NR 4 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 207 EP 209 DI 10.1007/BF00777870 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600038 ER PT J AU CHENG, CC AF CHENG, CC TI SOFT-X-RAY OBSERVATIONS OF HELMET STRUCTURES FROM SXT YOHKOH SO SPACE SCIENCE REVIEWS LA English DT Review DE SOLAR; X-RAY; HELMET STRUCTURE AB We present soft X-ray observations of helmet structures in solar active regions obtained from SXT/Yohkoh. These helmet structures are observed to form in the flare decay phase and to be associated with active region loop interactions. Their morphology is similar to the much larger scale helmet streamers that appear in the outer corona as shown in optical images of solar eclipse. The observed X-ray helmet structures appear to be in quasi-equilibrium with lifetimes greater than the MHD time scale. Using the filter ratio method for the X-ray observations, we find that the cusp region has lower temperature and higher density than that in the stalk region above it. The plasma pressure in the cusp region is about the same or slightly higher than that in the stalk region. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 273 EP 278 DI 10.1007/BF00777879 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600047 ER PT J AU WANG, YM AF WANG, YM TI EFFECT OF AREAL EXPANSION AND CORONAL HEATING ON THE SOLAR-WIND SO SPACE SCIENCE REVIEWS LA English DT Review DE SOLAR PHYSICS; SOLAR CORONA; SOLAR WIND ID INTERPLANETARY MAGNETIC-FIELD; FLUX; FLOW; MASS AB Empirical studies have shown that the solar wind speed at Earth is inversely correlated with the areal expansion rate of magnetic flux tubes near the Sun. Recent model calculations that include a self-consistent determination of the coronal temperature allow one to understand the physical basis of this relationship; they also suggest why the solar wind mass flux is relatively constant. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7672W, WASHINGTON, DC 20375 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 387 EP 390 DI 10.1007/BF00777897 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600065 ER PT J AU GALBRAITH, CS MERRILL, GB MORGAN, G AF GALBRAITH, CS MERRILL, GB MORGAN, G TI BILATERAL STRATEGIC GROUPS - THE MARKET FOR NONTACTICAL NAVY INFORMATION-SYSTEMS SO STRATEGIC MANAGEMENT JOURNAL LA English DT Article DE STRATEGIC GROUPS; BILATERAL COMPETITION; NAVY INFORMATION SYSTEMS; INDUSTRY STRUCTURE ID MOBILITY BARRIERS; PERFORMANCE; INDUSTRY AB Although recent studies of strategic groups have provided much insight into the nature of intra-industry rivalry, most studies have focused on the strategies of seller firms. In this paper we argue that the bilateral exchange between groups of buyers and sellers in adjacent markets should be made explicit. Within this bilateral context, the market for non-tactical Navy information systems is empirically examined. Strategic groups are developed for both seller and buyer industries, and the interaction between these groups are explored over time. In particular, two market interventions, the imposition of industrial funding procedures in 1984 and a Life-Cycle requirement order in 1988, were examined with respect to their impact on seller/customer exchanges and vertical integration strategies. Significant changes in strategies were noted, and explained within a transaction cost framework. C1 BUSINESS VALUAT SERV,SAN DIEGO,CA. USN,US NAVAL DIST,SAN DIEGO,CA 92132. RP GALBRAITH, CS (reprint author), UNIV N CAROLINA,CAMERON SCH BUSINESS ADM,WILMINGTON,NC 28401, USA. RI pinto, rosiele/G-3761-2014 OI pinto, rosiele/0000-0003-3017-6683 NR 21 TC 8 Z9 8 U1 0 U2 6 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0143-2095 J9 STRATEGIC MANAGE J JI Strateg. Manage. J. PD OCT PY 1994 VL 15 IS 8 BP 613 EP 626 DI 10.1002/smj.4250150804 PG 14 WC Business; Management SC Business & Economics GA PM200 UT WOS:A1994PM20000003 ER PT J AU LIEBMAN, JF VANVECHTEN, D HAALAND, A AF LIEBMAN, JF VANVECHTEN, D HAALAND, A TI THE ENERGETICS OF IONS, ATOMS, AND SALTS - SODIUM AND ITS CHLORIDE SO STRUCTURAL CHEMISTRY LA English DT Article DE BORN-HABER CYCLE; BOND ENERGIES; COULOMBIC ATTRACTION; ELECTRON AFFINITIES; IONIC BONDING; IONIZATION POTENTIALS AB In this study we reconcile three seemingly contradictory assertions regarding sodium chloride. First, gaseous sodium chloride is Coulombically bound and highly ionic. Second, upon pulling the molecule apart atomic sodium and chlorine are produced. This is somewhat surprising; despite the high ionicity of NaCl, since IP(Na) > EA(Cl). Third, heterolytically dissociating NaCl(g) into Na+ + Cl+ costs more energy than ionizing gaseous Na into Na+ + e-. Does this violate Coulomb's law since the Na-Cl bond distance in NaCl(g) is greater than the average Na nucleus-valance electron distance? C1 USN,RES LAB,DIV SPACE SCI,WASHINGTON,DC 20375. UNIV OSLO,DEPT CHEM,OSLO 3,NORWAY. RP LIEBMAN, JF (reprint author), UNIV MARYLAND,DEPT CHEM & BIOCHEM,CATONSVILLE,MD 21228, USA. NR 4 TC 2 Z9 2 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 1040-0400 J9 STRUCT CHEM JI Struct. Chem. PD OCT PY 1994 VL 5 IS 5 BP 341 EP 343 DI 10.1007/BF02281226 PG 3 WC Chemistry, Multidisciplinary; Chemistry, Physical; Crystallography SC Chemistry; Crystallography GA PN622 UT WOS:A1994PN62200007 ER PT J AU ANDERSON, DD ROSENFELD, P CRUIKSHANK, L AF ANDERSON, DD ROSENFELD, P CRUIKSHANK, L TI AN EXERCISE FOR EXPLICATING AND CRITIQUING STUDENTS IMPLICIT PERSONALITY THEORIES SO TEACHING OF PSYCHOLOGY LA English DT Note ID INFORMATION; SELF AB Despite its recent growth, implicit psychology is largely excluded from undergraduate personality textbooks. Student's preconceptions about personality likely bias their evaluation of formal personality theories and are generally ignored by personality instructors. We present an exercise that requires students to critique their preconceived beliefs about personality as if these beliefs constituted formal personality theories. Students rated the assignment as difficult but thought-provoking and valuable for the insight it gave them into the formal theories and their own beliefs. The exercise engenders active learning by involving students directly in the difficulties of theory construction. Students probably relate the more formal theories they learn to the existing framework of their own theories. This self-referencing should enhance memory of formal theories. C1 USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92132. RP ANDERSON, DD (reprint author), PACIFIC LUTHERAN UNIV,DEPT PSYCHOL,TACOMA,WA 98447, USA. NR 14 TC 1 Z9 1 U1 1 U2 2 PU LAWRENCE ERLBAUM ASSOC INC PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430-2262 SN 0098-6283 J9 TEACH PSYCHOL JI Teach. Psychol. PD OCT PY 1994 VL 21 IS 3 BP 174 EP 177 DI 10.1207/s15328023top2103_13 PG 4 WC Education & Educational Research; Psychology, Multidisciplinary SC Education & Educational Research; Psychology GA PN191 UT WOS:A1994PN19100013 ER PT J AU NARAYAN, P FOURNIER, G GAJENDRAN, V LEIDICH, R LO, R WOLF, JS JACOB, G NICOLAISEN, G PALMER, K FREIHA, F AF NARAYAN, P FOURNIER, G GAJENDRAN, V LEIDICH, R LO, R WOLF, JS JACOB, G NICOLAISEN, G PALMER, K FREIHA, F TI UTILITY OF PREOPERATIVE SERUM PROSTATE-SPECIFIC ANTIGEN CONCENTRATION AND BIOPSY GLEASON SCORE IN PREDICTING RISK OF PELVIC LYMPH-NODE METASTASES IN PROSTATE-CANCER SO UROLOGY LA English DT Article ID COMPUTERIZED-TOMOGRAPHY; RADICAL PROSTATECTOMY; CONSECUTIVE PATIENTS; PATHOLOGICAL STAGE; CLINICAL STAGE; TUMOR GRADE; ADENOCARCINOMA; EXPERIENCE; CARCINOMA; NEED AB Objectives To determine the accuracy of the preoperative serum concentration of prostate-specific antigen (PSA) plus the Gleason pathology score of biopsy specimens in predicting the presence of disease in the pelvic lymph nodes in patients with prostate cancer. Methods. The medical records of all patients treated for prostate cancer at eight medical centers from January 1988 to June 1993 were reviewed. There were 932 patients with newly diagnosed prostate cancer for whom all relevant data were available who had undergone pelvic lymphadenectomy with (n = 912) or without (n = 20) radical prostatectomy. The rate of false-negative predictions of metastases based on combined preoperative biopsy Gleason score and serum PSA concentration was analyzed. A multivariate logistic regression analysis was performed tp assess the value of preoperative serum PSA and biopsy Gleason scores individually and in combination in predicting pelvic lymph node metastases. Results. The false-negative rate of metastases was 0% for preoperative PSA concentrations less than or equal to 6 ng/mL and biopsy Gleason scores less than or equal to 5 (n = 142) and 1.0% for PSA concentrations less than or equal to 10 ng/mL and Gleason scores less than or equal to 6 (n = 388). The 95% upper confidence limit for the rate of false negativity at this PSA cut-off level was 2.0%. A combination of preoperative serum PSA levels and biopsy Gleason scores provided the best prediction for the false-negative rates. Conclusions. For patients with newly diagnosed prostate cancer who have biopsy Gleason scores less than or equal to 6 and preoperative PSA concentrations less than or equal to 10 ng/mL (42% of our series), a staging pelvic lymphadenectomy appears to be unnecessary. The substantial cost associated with both cross-sectional imaging and staging lymphadenectomy may therefore be avoidable in this group of patients. C1 STANFORD UNIV,PALO ALTO,CA 94304. USN,OAKLAND HOSP,SAN RAFAEL,CA. KAISER HOSP,SAN RAFAEL,CA. RP NARAYAN, P (reprint author), UNIV CALIF SAN FRANCISCO,SCH MED,DEPT UROL,U-575,SAN FRANCISCO,CA 94143, USA. NR 25 TC 85 Z9 85 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD OCT PY 1994 VL 44 IS 4 BP 519 EP 524 DI 10.1016/S0090-4295(94)80050-2 PG 6 WC Urology & Nephrology SC Urology & Nephrology GA PK421 UT WOS:A1994PK42100012 PM 7524237 ER PT J AU WALLACE, MR HOOPER, DG GRAVES, SJ MALONE, JL AF WALLACE, MR HOOPER, DG GRAVES, SJ MALONE, JL TI MEASLES SEROPREVALENCE AND VACCINE RESPONSE IN HIV-INFECTED ADULTS SO VACCINE LA English DT Article DE MEASLES; IMMUNIZATION; HIV INFECTION ID HUMAN IMMUNODEFICIENCY VIRUS; CHILDREN AB Measles in HIV-infected patients can be a severe, even fatal, illness. The prevalence of measles seropositivity in HIV-infected adults and the durability of these antibody levels are uncertain. A prospective survey of 210 HIV-infected adults found that 95% of the adults had demonstrable antibodies using a standard ELISA technique. Seropositivity was no different in patients with CD4 counts over 400, from those with more advanced disease and CD4 counts tinder 200 (p=0.8). Six seronegative patients were vaccinated and had serial antibody determinations; two of six (33%) patients had a durable positive antibody response at 1 year, and none had any observed toxicity. Vaccination of the identified measles-seronegative HIV-infected adults who are at high risk for measles is recommended, but a mensurable antibody response may be expected in only a minority of cases. C1 USN,MED CTR,DEPT INTERNAL MED,DIV HIV,SAN DIEGO,CA 92152. USN,MED CTR,DEPT LAB,SAN DIEGO,CA 92152. USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92152. NR 11 TC 26 Z9 26 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0264-410X J9 VACCINE JI Vaccine PD OCT PY 1994 VL 12 IS 13 BP 1222 EP 1224 DI 10.1016/0264-410X(94)90247-X PG 3 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA PG671 UT WOS:A1994PG67100012 PM 7839728 ER PT J AU OLSON, PE WALLACE, MR CREEK, JG AF OLSON, PE WALLACE, MR CREEK, JG TI ROCHALIMAEA - A COSMOPOLITAN ZOONOSIS SO WESTERN JOURNAL OF MEDICINE LA English DT Letter C1 USN,MED CTR,DEPT CLIN INVEST,OFF SAN DIEGO CTY VET,SAN DIEGO,CA 92134. RP OLSON, PE (reprint author), USN,MED CTR,DEPT CLIN INVEST,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 5 TC 6 Z9 6 U1 0 U2 0 PU CALIFORNIA PHYSICIAN MAGAZINE PI SAN FRANCISCO PA C/O DONNA TAYLOR, EDITOR, PO BOX 7690, SAN FRANCISCO, CA 94102-7690 SN 0093-0415 J9 WESTERN J MED JI West. J. Med. PD OCT PY 1994 VL 161 IS 4 BP 428 EP 428 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA PN934 UT WOS:A1994PN93400021 PM 7529453 ER PT J AU MCHENRY, E HEATH, SB AF MCHENRY, E HEATH, SB TI THE LITERATE AND THE LITERARY - AFRICAN-AMERICANS AS WRITERS AND READERS - 1830-1940 SO WRITTEN COMMUNICATION LA English DT Article ID IDEOLOGY AB Orality has been a feature repeatedly offered to typify African American language habits. Through anthropological studies of contemporary communities as well as literary portrayals and celebrations of cultural heroes such as preachers and political orators, the strong oral traditions of African Americans have figured prominently in discussions of the contexts of their literary works. This article argues for a balance of this image by laying out historical evidence on the literate values and habits of African Americans since the early 1800s. Literary journals, the Black press, literary writers, and literary societies, especially those of women, between 1830 and 1940 highly valued joint reading groups, creative writing efforts, and the role of literature in the lives of African Americans. Considerable work remains to restore accuracy and cross-class representation of African Americans in English studies, so as to resist tendencies to deny variation in the language habits and values of groups included in multicultural literature. C1 USN ACAD,ANNAPOLIS,MD 21402. STANFORD UNIV,STANFORD,CA 94305. RP MCHENRY, E (reprint author), HARVARD UNIV,WEB DUBOIS INST,CAMBRIDGE,MA 02138, USA. NR 63 TC 12 Z9 12 U1 1 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0741-0883 J9 WRIT COMMUN JI Writ. Commun. PD OCT PY 1994 VL 11 IS 4 BP 419 EP 444 DI 10.1177/0741088394011004001 PG 26 WC Communication SC Communication GA PK132 UT WOS:A1994PK13200001 ER PT J AU BLANK, DA AF BLANK, DA TI THE CARTESIAN COLLAPSED-DIMENSION METHOD FOR USE IN NUMERICAL 2-D RADIATION CALCULATIONS IN ABSORBING-EMITTING MEDIA SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article AB A new numerical approach has been devised for performing accurate absorbing-emitting non-scattering radiation calculations for Cartesian co-ordinate based problems with one ordinate symmetry using only the solution plane formed by the other two ordinates. To accomplish this, the method makes use of 'effective intensity rays' which only exist and have meaning in the solution plane of the problem but which are made, through a special procedure, to contain the information of the third dimension. This novel procedure thus eliminates the problem of solid angles and greatly reduces both the complexity and computational expense involved in the solution of such problems. Yet it can do this without producing loss in accuracy. The approach is ultimately intended for use in combustion problems involving high temperatures and optically thin media. For verification purposes the method is applied to the problem of heat exchange in infinitely long rectangular enclosures and is found to give excellent results over a optical thickness range that includes the optically very thin case. RP BLANK, DA (reprint author), USN ACAD,DEPT MED ENGN,ANNAPOLIS,MD 21402, USA. NR 15 TC 7 Z9 7 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD SEP 30 PY 1994 VL 37 IS 18 BP 3023 EP 3036 DI 10.1002/nme.1620371802 PG 14 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA PH300 UT WOS:A1994PH30000001 ER PT J AU GOLDBERG, L MEHUYS, D AF GOLDBERG, L MEHUYS, D TI HIGH-POWER SUPERLUMINESCENT DIODE SOURCE SO ELECTRONICS LETTERS LA English DT Article DE LIGHT EMITTING DIODES; SEMICONDUCTOR OPTICAL AMPLIFIERS ID FIBER AB A high power superluminescent tapered GaAlAs amplifier source is described which produces 165 mW of broadband, diffraction limited emission, and 470 mW when seeded by a conventional low power SLD. A maximum of 252 mW was transmitted through a singlemode fibre. C1 SDL INC,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 12 Z9 12 U1 0 U2 4 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 29 PY 1994 VL 30 IS 20 BP 1682 EP 1684 DI 10.1049/el:19941141 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA PN250 UT WOS:A1994PN25000037 ER PT J AU YANG, MJ BENNETT, BR AF YANG, MJ BENNETT, BR TI INAS/GASB INFRARED PHOTOVOLTAIC DETECTOR AT 77K SO ELECTRONICS LETTERS LA English DT Article DE INFRARED DETECTORS; PHOTOVOLTAIC CELLS ID SUPERLATTICES AB The characterisation of an 8 mu m infrared photovoltaic detector based on InAs/GaSb superlattices is carried out at 77 K for the first time. The built-in field is established by the Fermi level difference between the superlattice surface and the InAs buffer layer. The photocurrent is from photoexcited carriers traversing through the superlattice conduction miniband. A current responsivity of 0.07 A/W has been obtained, implying that one out of 10 photoexcited electrons has been collected. RP YANG, MJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 9 TC 18 Z9 18 U1 2 U2 2 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 29 PY 1994 VL 30 IS 20 BP 1710 EP 1711 DI 10.1049/el:19941138 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA PN250 UT WOS:A1994PN25000056 ER PT J AU SANGHERA, JS KUNG, FH PUREZA, PC NGUYEN, VQ MIKLOS, RE AGGARWAL, ID AF SANGHERA, JS KUNG, FH PUREZA, PC NGUYEN, VQ MIKLOS, RE AGGARWAL, ID TI INFRARED EVANESCENT-ABSORPTION SPECTROSCOPY WITH CHALCOGENIDE GLASS-FIBERS SO APPLIED OPTICS LA English DT Article DE CHALCOGENIDE GLASS FIBER; REMOTE IR SPECTROSCOPY; EVANESCENT ABSORPTION; FIBEROPTIC SENSORS ID OPTICAL FIBERS; SENSOR AB We have used telluride glass fibers fabricated in house to measure the evanescent-absorption spectra of water, methanol, ethanol, isopropanol, acetone, ethanoic acid, hexane, and chloroform. Furthermore, detection limits of less than 2 vol. % solute were obtained for mixtures of water and methanol, ethanol, isopropanol, acetone, and ethanoic acid. Techniques to reduce the detection limits are discussed. C1 VIRGINIA POLYTECH INST & STATE UNIV, DEPT ELECT ENGN, BLACKSBURG, VA 24061 USA. UNIV MARYLAND, RES FDN, GREENBELT, MD 20770 USA. SFA INC, LANDOVER, MD 20785 USA. RP SANGHERA, JS (reprint author), USN, RES LAB, CODE 5603-2, WASHINGTON, DC 20375 USA. NR 16 TC 38 Z9 38 U1 1 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 20 PY 1994 VL 33 IS 27 BP 6315 EP 6322 PG 8 WC Optics SC Optics GA PJ393 UT WOS:A1994PJ39300005 PM 20941163 ER PT J AU EWING, KJ BILODEAU, T NAU, G SCHNEIDER, I AGGARWAL, ID AF EWING, KJ BILODEAU, T NAU, G SCHNEIDER, I AGGARWAL, ID TI DETECTION OF LOW-LEVELS OF TRICHLOROETHYLENE VAPOR WITH RAMAN-SPECTROMETRY SO APPLIED OPTICS LA English DT Article ID EMULSION POLYMERIZATION; SPECTROSCOPY; SENSOR; WATER AB The response of a novel fiber-optic Raman probe to low levels of trichloroethylene (TCE) vapors is characterized. The detection limit of the current probe for TCE vapor is 34 mg/L, and the probe exhibits a fully reversible response. The probe uses an organic-polymer, low-density polyethylene to concentrate TCE vapors in the optical path of the fiber-optic Raman spectrometer. The relative standard deviation for measurement of 677 mg/L of TCE in the vapor is 0.3%. C1 UNIV RES FDN, GREENBELT, MD 20770 USA. RP EWING, KJ (reprint author), USN, RES LAB, DIV OPT SCI, CODE 6503-2, 555 OVERLOOK AVE SW, WASHINGTON, DC 20375 USA. NR 14 TC 4 Z9 4 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 20 PY 1994 VL 33 IS 27 BP 6323 EP 6327 PG 5 WC Optics SC Optics GA PJ393 UT WOS:A1994PJ39300006 PM 20941164 ER PT J AU HARRIS, MJ SHARE, GH LEISING, MD AF HARRIS, MJ SHARE, GH LEISING, MD TI SMM OBSERVATIONS OF GAMMA-RAY TRANSIENTS .3. A SEARCH FOR A BROADENED, REDSHIFTED POSITRON-ANNIHILATION LINE FROM THE DIRECTION OF THE GALACTIC-CENTER SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXY, CENTER; GAMMA-RAYS, OBSERVATIONS ID CENTER REGION; 1E 1740.7-2942; RADIATION; EMISSION; SPECTROMETER; DISCOVERY; SPECTRUM; STATE; MUSCA; NOVA AB We have searched the 1980-1988 Solar Maximum Mission gamma-ray spectrometer data for transient emission on timescales from hours to approximately 12 days of broad gamma-ray lines at energies congruent-to 400 keV, which were reported by the HEAO 1 and SIGMA experiments from two sources lying toward the Galactic center. The lines have been interpreted as the product of the annihilation of positrons in pair plasmas surrounding the black hole candidate 1E 1740.7-2942 and the X-ray binary IH 1822-371. Our results from a combined exposure of approximately 1.5 x 10(7) s provide no convincing evidence for transient emission of this line on any timescale between approximately 9 hr and approximately 1 yr. Our 3 sigma upper limits on the line flux during approximately 12 day intervals are characteristically 4.8 x 10(-3) photon cm-2 s-1, while for approximately 1 day intervals our 3 sigma upper limits are characteristically 4.9 x 10(-3) photon cm-2 s-1. These results imply a duty cycle of less than 1.3% for the transient line measured from IH 1822-371 during a approximately 3 week interval in 1977 by HEAO 1, and a duty cycle of less-than-or-equal-to 0.8% for the transient line detected in 1990 and 1992 from 1E 1740.7 - 2942 on approximately 1 day timescales by SIGMA. C1 USN,RES LAB,WASHINGTON,DC 20375. CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. RP HARRIS, MJ (reprint author), UNIV SPACE RES ASSOC,300 D ST SW,SUITE 801,WASHINGTON,DC 20024, USA. NR 29 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1994 VL 433 IS 1 BP 87 EP 95 DI 10.1086/174627 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PG639 UT WOS:A1994PG63900008 ER PT J AU WATANABE, H KITAMOTO, S MIYAMOTO, S FIEDLER, RL WALTMAN, EB JOHNSTON, KJ GHIGO, FD AF WATANABE, H KITAMOTO, S MIYAMOTO, S FIEDLER, RL WALTMAN, EB JOHNSTON, KJ GHIGO, FD TI CORRELATION BETWEEN X-RAY-INTENSITY AND RADIO OUTBURSTS OF CYGNUS-X-3 SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIO CONTINUUM, STARS; STARS, INDIVIDUAL (CYGNUS X-3); X-RAYS, STARS ID LONG-TERM OBSERVATIONS; SPECTRAL BEHAVIOR; ENERGY-SPECTRA; SCORPIUS X-1; VARIABILITY; SATELLITE; EXPANSION; FLARES; 0.35C; GINGA AB The relationship between the X-ray flux (1-20 keV) and the radio flux density (S and X bands) of Cygnus X-3 is investigated during a 4.5 yr interval, spanning 1987 March-1991 September. This period included seven strong radio outbusts with flux densities greater than 5 Jy at S band. All radio flares with maximum flux density greater than 0.5 Jy, including the seven strong radio outbursts, occurred when the 1-6 keV X-ray flux, averaged within 5 days before and after the peak of the radio flare, was greater than 0.37 counts s-1 cm-2, which was corrected for the 4.8 hr intensity modulation. These X-ray fluxes correspond to a high state with a luminosity of roughly 10(38) ergs s-1 at 8.5 kpc, implying that a very high accretion rate induces the radio flares. However, no simultaneous increase of X-rays during the radio outburst was detected. This fact suggests that the direct cause of the radio outbursts is some other process, during the high accretion rate, such as a gradual storage and a sudden release of energy by a twisting magnetic field in the accretion process. Population distributions of the mean X-ray flux (1-6 keV) and the X-ray softness ratio (1-6 keV/6-20 keV) was also studied, and they indicated the existence of two distinct states, i.e., high (soft) and low (hard) states. This fact suggests a bimodal behavior of the accretion disk. C1 OSAKA UNIV,FAC SCI,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. OSAKA UNIV,FAC SCI,DEPT EARTH & SPACE SCI,TOYONAKA,OSAKA 560,JAPAN. USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. NATL RADIO ASTRON OBSERV,GREEN BANK,WV 24944. NR 55 TC 36 Z9 36 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1994 VL 433 IS 1 BP 350 EP 356 DI 10.1086/174649 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PG639 UT WOS:A1994PG63900030 ER PT J AU RIDOUT, JA CHERTOCK, B GELARO, R AF RIDOUT, JA CHERTOCK, B GELARO, R TI RESPONSE OF A GENERAL-CIRCULATION MODEL TO A CHANGE IN-CLOUD SOLAR FORCING - MODEL FEEDBACKS AND COMPARISON WITH SATELLITE DATA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID EARTH-RADIATION-BUDGET; COMMUNITY-CLIMATE-MODEL; EXTENDED WATER CLOUDS; OCEAN SURFACE; ECMWF MODEL; NATIONAL-CENTER; ENERGY-BALANCE; FORECAST MODEL; ABSORPTION; IRRADIANCE AB The response of a general circulation model to a change in its treatment of cloud solar forcing is investigated. Radiation field data from the forecast model of the Navy Operational Global Atmospheric Prediction System for five Julys (1979-1983) are presented in an investigation of the effect of a change from grid cell averaged clouds to maximally overlapping clouds in the model's solar radiation scheme. The model results are compared with Nimbus 7 Earth Radiation Budget top of the atmosphere (TOA) solar and longwave irradiances and with derived surface solar irradiance data. Although the maximal overlap scheme performs considerably better than the grid cell averaging scheme (reducing maximum deficiencies in TOA and surface solar irradiance by over 100 W m(-2)) significant errors remain. The simulated correlation between TOA net solar and longwave irradiance improves at low latitudes in the northern hemisphere, with little change at higher latitudes. This improved correlation is consistent with the greater consistency between the treatments of solar and longwave cloud radiative forcing brought to the model by the new solar radiation scheme. The change in the radiation treatment is shown to have the greatest direct effect on solar radiation over convective regions, a consequence of the scarcity of optically thick clouds produced by the model's cloud parameterization in other regions. The model responds with an increase in convective activity over land and an increase in the flux of moisture from sea to land. Planetary cooling over the oceans increases because of a decrease in cloud cover. From mid to high latitudes in the northern hemisphere, there are scattered regions of increased cloud water content associated with increased tropospheric temperatures. Over land the model response in terms of TOA downwelling solar irradiance tends to counter the increase in solar irradiance caused by the model change in all latitudinal zones in the northern hemisphere. This response is caused primarily by changes in the cloud fields, which thus act as a negative feedback following the change in cloud solar forcing. The significance of this response is examined with respect to the perturbation in solar irradiance represented by the model change. An estimate of this perturbation is obtained by taking the difference in solar irradiance diagnosed by the two cloud solar forcing treatments for Simulations employing the grid cell averaging scheme. The response is significantly greater in magnitude in the tropics than at midlatitudes, both in an absolute sense and as a percentage of this perturbation. Because TOA longwave irradiance exhibits a positive response in the tropics, and a negative response at midlatitudes, however, the percentage response in net TOA downwelling irradiance is actually greater in magnitude at midlatitudes. In a number of regions the cloud feedback is very large, showing the importance for cloud field prediction of improvements in the treatment of cloud solar forcing. Such cloud feedback also explains the small improvement seen here in the prediction of TOA solar irradiance in certain regions. increases in surface sensible heating and longwave Cooling are generally considerably less than increases in surface latent heating, though a notable exception occurs in arid central Asia. A large ground temperature increase in that region is strongly correlated at low levels with the atmospheric temperature increase observed at midlatitudes in the northern hemisphere. C1 NOAA, ENVIRONM TECHNOL LAB, BOULDER, CO 80303 USA. RP USN, RES LAB, 7 GRACE HOPPER AVE, BOX 2, MONTEREY, CA 93943 USA. NR 63 TC 5 Z9 5 U1 1 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X EI 2169-8996 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD SEP 20 PY 1994 VL 99 IS D9 BP 18555 EP 18576 DI 10.1029/94JD00359 PG 22 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PH357 UT WOS:A1994PH35700005 ER PT J AU RUTH, J SELINGER, JV SHASHIDHAR, R AF RUTH, J SELINGER, JV SHASHIDHAR, R TI THE ELECTROSTATIC POLARIZATION OF FERROELECTRIC LIQUID-CRYSTALS - A NEW INTERPRETATION OF THE TRIANGLE-WAVE TECHNIQUE SO APPLIED PHYSICS LETTERS LA English DT Article AB We show that the electrostatic polarization measured in ferroelectric liquid crystals using the standard triangle-wave technique is not the total polarization of the sample, but rather a specific nonlinear component of the total polarization. We present a Landau theory to calculate this nonlinear component explicitly. In the high-temperature limit, above the smectic-A-smectic-C* phase transition, the theory predicts that the observed polarization scales as E3/(T - T(AC))4, where T is the temperature and E the applied electric field. In the low-temperature limit, the observed polarization approaches the total polarization. These theoretical predictions are consistent with experimental measurements. RP RUTH, J (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. RI Selinger, Jonathan/D-1445-2010 OI Selinger, Jonathan/0000-0002-4982-2457 NR 7 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 19 PY 1994 VL 65 IS 12 BP 1590 EP 1592 DI 10.1063/1.112923 PG 3 WC Physics, Applied SC Physics GA PG925 UT WOS:A1994PG92500039 ER PT J AU SLOOP, SE LERNER, MM STEPHENS, TS TIPTON, AL PAULL, DG STENGERSMITH, JD AF SLOOP, SE LERNER, MM STEPHENS, TS TIPTON, AL PAULL, DG STENGERSMITH, JD TI CROSS-LINKING POLY(ETHYLENE OXIDE) AND POLY[OXYMETHYLENE-OLIGO(OXYETHYLENE)] WITH ULTRAVIOLET-RADIATION SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID IONIC-CONDUCTIVITY; ELECTROLYTES; TRANSPORT; POLYMERS; NETWORKS AB Poly (ethylene oxide) (PEO) and poly [oxymethylene-oligo (oxyethylene)] (PEM) disks are cross-linked by exposure to 254 nm radiation. The rate of formation of cross-links is greatly enhanced by the presence of benzophenone, and an average cross-link density of up to 6 mol % of ethoxy units can be obtained after several hours of irradiation. The highly cross-linked polymers are insoluble in water or organic solvents and show improved physical properties for handling and the formation of free-standing films. Scanning calorimetry and polymer swelling are employed to characterize the polymers, and impedance measurements are reported for sodium salt complexes prepared from the cross-linked polymers. Dynamic modulus measurements show that, upon irradiation, PEO and PEM become cross-linked, elastomeric solids. (C) 1994 John Wiley and Sons, Inc. C1 OREGON STATE UNIV,CTR ADV MAT RES,CORVALLIS,OR 97331. USN,CTR AIR WARFARE,DIV WEAPONS,DEPT RES,DIV CHEM,POLYMER SCI BRANCH,CHINA LAKE,CA 93555. RP SLOOP, SE (reprint author), OREGON STATE UNIV,DEPT CHEM,GILBERT HALL 153,CORVALLIS,OR 97331, USA. RI Stephens, Thomas/D-9512-2012 NR 29 TC 28 Z9 28 U1 0 U2 6 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD SEP 19 PY 1994 VL 53 IS 12 BP 1563 EP 1572 DI 10.1002/app.1994.070531202 PG 10 WC Polymer Science SC Polymer Science GA PE240 UT WOS:A1994PE24000002 ER PT J AU PICKETT, WE AF PICKETT, WE TI NEGATIVE ELECTRON-AFFINITY AND LOW WORK FUNCTION SURFACE - CESIUM ON OXYGENATED DIAMOND(100) SO PHYSICAL REVIEW LETTERS LA English DT Article ID EMISSION AB Building on analogies with low work function metal surfaces, an oxygenated C(100) surface cesiated at the half-monolayer level has been studied with self-consistent local-density-based methods. Cesiation of the surface is found to shift the 2.45 eV positive electron affinity oxygenated surface to a surface with the bull; diamond conduction band 0.85 eV above the vacuum level, in effect a 0.85 eV negative electron affinity (NEA). The resulting surface is in fact metallic due to Cs-O-C surface states and thereby also provides a low work function Phi = 1.25 eV. The combination of NEA bulk material with metallic low-Phi surface promotes noncharging electron emission that makes it promising for novel diamond-based optoelectronic devices. RP PICKETT, WE (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375, USA. NR 20 TC 72 Z9 72 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 19 PY 1994 VL 73 IS 12 BP 1664 EP 1667 DI 10.1103/PhysRevLett.73.1664 PG 4 WC Physics, Multidisciplinary SC Physics GA PG522 UT WOS:A1994PG52200026 ER PT J AU BERTHA, CM MATTSON, MV FLIPPENANDERSON, JL ROTHMAN, RB XU, H CHA, XY BECKETTS, K RICE, KC AF BERTHA, CM MATTSON, MV FLIPPENANDERSON, JL ROTHMAN, RB XU, H CHA, XY BECKETTS, K RICE, KC TI A MARKED CHANGE OF RECEPTOR AFFINITY OF THE 2-METHYL-5-(3-HYDROXYPHENYL)MORPHANS UPON ATTACHMENT OF AN (E)-8-BENZYLIDENE MOIETY - SYNTHESIS AND EVALUATION OF A NEW CLASS OF SIGMA-RECEPTOR LIGANDS SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID GUINEA-PIG BRAIN; OPIOID BINDING-SITES; H-3 (+)-PENTAZOCINE; OPIATE RECEPTOR; PHENCYCLIDINE; IDENTIFICATION; HALOPERIDOL; DRUGS; MEMBRANES; ANALOGS AB The (E)-8-benzylidene and (E)-8-(3,4-dichlorobenzylidene), 7-ketone derivatives, 5 and 6, of the synthetic opiate 2-methyl-5-(3-hydraxyphenyl)morphan [5-(3-hydroxyphenyl)-2-methyl-2-azabicyclo[3.3.1]nonane, 1], were synthesized from the 7-ketone derivatives 2 or 4 via the Claisen-Schmidt reaction. The corresponding enantiomers of 5 and 6 were obtained in > 99% optical purity from the optical isomers of 4, resolved with the 0,0'-dibenzoyltartaric acids. The absolute configurations of the enantiomers of 4 were determined by conversion, via Clemmensen reduction, to the enantiomers of 1, the configurations of which are known. The determination of the regioisomer and configurational isomer of 5, with respect to the introduced benzylidene group, was determined from a single-crystal X-ray analysis. H-1 NMR data was used to confirm that 6 possessed the same configuration as 5. Radioreceptor binding studies in rat and guinea pig brain preparations revealed that (-)-(1S,5S)-5 displayed an 11-fold decrease in affinity for the opioid mu receptor and an increase in affinity for a receptors of 81-fold (low nanomolar affinity) relative to the ketone precursor (+)-(1S,5S)-4. An analogous, albeit less dramatic, trend was seen with compound (-)-(1S,5S)-6. Compounds (-)-(1S,5S)-5 and (-)-(1S,5S)-6 are distinct from the typical a-opiates in that they have very low affinity for either PCP sites or muscarinic receptors. The high affinity and selectivity of these novel a receptor ligands suggests that they will be valuable for the elucidation of the functional roles of sigma receptors. C1 NIDDKD,MED CHEM LAB,BETHESDA,MD 20892. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NIDA,ADDICT RES CTR,CLIN PSYCHOPHARMACOL SECT,BALTIMORE,MD 21224. NR 62 TC 16 Z9 17 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD SEP 16 PY 1994 VL 37 IS 19 BP 3163 EP 3170 DI 10.1021/jm00045a022 PG 8 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA PH073 UT WOS:A1994PH07300022 PM 7932540 ER PT J AU APRILL, B DRAKE, AJ SHAKIR, KMM AF APRILL, B DRAKE, AJ SHAKIR, KMM TI DIAGNOSING PHEOCHROMOCYTOMA IN VON HIPPEL-LINDAU DISEASE - RESPONSE SO ANNALS OF INTERNAL MEDICINE LA English DT Letter C1 NATL NAVAL MED CTR, BETHESDA, MD 20889 USA. RP APRILL, B (reprint author), USN, MED CTR, OAKLAND, CA 94627 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD SEP 15 PY 1994 VL 121 IS 6 BP 465 EP 466 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA PF337 UT WOS:A1994PF33700015 ER PT J AU FOSS, FM BORKOWSKI, TA GILLIOM, M STETLERSTEVENSON, M JAFFE, ES FIGG, WD TOMPKINS, A BASTIAN, A NYLEN, P WOODWORTH, T UDEY, MC SAUSVILLE, EA AF FOSS, FM BORKOWSKI, TA GILLIOM, M STETLERSTEVENSON, M JAFFE, ES FIGG, WD TOMPKINS, A BASTIAN, A NYLEN, P WOODWORTH, T UDEY, MC SAUSVILLE, EA TI CHIMERIC FUSION PROTEIN TOXIN DAB(486) IL-2 IN ADVANCED MYCOSIS-FUNGOIDES AND THE SEZARY-SYNDROME - CORRELATION OF ACTIVITY AND INTERLEUKIN-2 RECEPTOR EXPRESSION IN A PHASE-II STUDY SO BLOOD LA English DT Article ID T-CELL LYMPHOMA; IL-2 RECEPTOR; TRIAL; DAB486IL-2; TAC; CHEMOTHERAPY; MALIGNANCIES; DISORDERS; LEUKEMIA; ANTIGENS AB DAB(486)IL-2 is a recombinant toxin with the cell surface-binding domain of diphtheria toxin (DT) replaced by interleukin-2 (IL-2). To correlate clinical response with expression of components of the IL-2 receptor (IL-2R), 14 patients with cutaneous T-cell lymphoma (CTCL) received five daily 90-minute infusions every 21 days. There were no complete responses, 1 partial response (PR), 2 major biologic effects (major cutaneous improvement without change in circulating neoplastic cells), 3 stable disease (SD), and 8 progressive disease (PD). Responders had easily detected expression of CD25 (Tac; alpha-chain of IL-2R) in skin, and in two responders expression of the beta chain of the IL-2 receptor (beta-IL-SR) was detectable by reverse transcriptase-polymerase chain reaction. CD25 was also detected in 8 of 11 SD or PD patients, with beta-IL-2R in 3 of 8 SD or PD patients. Two of the three responders had anti-DT antibodies before treatment. Reversible increased hepatic transaminases occurred in 13 of 14 patients during the first course, with decreased frequency in repeated courses. The maximal serum concentration after the first infusion of DAB(486)IL-2 varied (1,369 +/- 1,155 ng/mL [mean +/- SD]; n = 14; range, 55 to 3,999 ng/mL) with a short half-life (T(1/2)beta = 0.21 +/- 0.12 h [mean +/- SD]; range, 0.099 to 0.57 h). The area under the concentration curve varied inversely with anti-DT antibody titer. We conclude that DAB(486)IL-2 has valuable activity in certain patients with CTCL. Expression of the IL-2R may be necessary but is not sufficient to predict response. C1 NCI,DERMATOL BRANCH,BETHESDA,MD 20892. USN HOSP,BETHESDA,MD. SERAGEN INC,HOPKINTON,MA. NCI,CLIN PHARMACOL BRANCH,BETHESDA,MD 20892. NCI,PATHOL LAB,BETHESDA,MD 20892. NCI,BIOL CHEM LAB,BETHESDA,MD 20892. UNIFORMED SERV UNIV HLTH SCI,NCI NAVY MED ONCOL BRANCH,BETHESDA,MD 20892. RI Figg Sr, William/M-2411-2016 NR 41 TC 61 Z9 62 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD SEP 15 PY 1994 VL 84 IS 6 BP 1765 EP 1774 PG 10 WC Hematology SC Hematology GA PG388 UT WOS:A1994PG38800009 PM 8080984 ER PT J AU PINTO, JF ROSENBLATT, GH ESTEROWITZ, L AF PINTO, JF ROSENBLATT, GH ESTEROWITZ, L TI CONTINUOUS-WAVE LASER ACTION IN ER3+-YLF AT 3.41-MU-M SO ELECTRONICS LETTERS LA English DT Article DE SOLID LASERS; LASER TRANSITIONS ID MU-M; TEMPERATURE AB Continuous-wave laser emission at 3.41 mum from an erbium-doped LiYF4 crystal (Er3+:YLF) at 77K is demonstrated. Operation of this four-level laser is based on the Er3+ F-4(9/2) - I-4(9/2) transition. An output power of 12mW and a slope efficiency of 2% have been achieved. RP PINTO, JF (reprint author), USN,RES LAB,CODE 5641,WASHINGTON,DC 20375, USA. NR 3 TC 12 Z9 12 U1 0 U2 4 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 15 PY 1994 VL 30 IS 19 BP 1596 EP 1598 DI 10.1049/el:19941085 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA PL138 UT WOS:A1994PL13800029 ER PT J AU WEIDMAN, DJ NGUYEN, KT RHEE, MJ SCHNEIDER, RF STARK, RA AF WEIDMAN, DJ NGUYEN, KT RHEE, MJ SCHNEIDER, RF STARK, RA TI RADIUS TAILORING OF AN ELECTRON-BEAM USING A FAST RISE-TIME FOCUSING COIL - EXPERIMENT AND SIMULATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HOSE INSTABILITY; ROGOWSKI COIL; PRESSURE AB An experiment demonstrating the production of a ''radius-tailored beam,'' which has a larger head and smaller tail for more stable propagation through gas, using a fast rise-time focusing coil is described. The results and their analyses for the radius-tailored case, the untailored case, and the ''reverse-tailored'' case are presented. A two-dimensional particle simulation of the experiment was performed for each case using the parameters of the experiment for the inputs and it produces results consistent with the experiment. RP WEIDMAN, DJ (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903, USA. NR 34 TC 2 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1994 VL 76 IS 6 BP 3244 EP 3249 DI 10.1063/1.357467 PG 6 WC Physics, Applied SC Physics GA PJ117 UT WOS:A1994PJ11700003 ER PT J AU MARMORINO, GO JANSEN, RW VALENZUELA, GR TRUMP, CL LEE, JS KAISER, JAC AF MARMORINO, GO JANSEN, RW VALENZUELA, GR TRUMP, CL LEE, JS KAISER, JAC TI GULF-STREAM SURFACE CONVERGENCE IMAGED BY SYNTHETIC-APERTURE RADAR SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID BREAKING WAVES; WIND STRESS; OCEAN; TEMPERATURE; ENTRAINMENT; FRONTS; WATER; SLOPE; SEA AB On July 20, 1990, the north edge of the Gulf Stream (36.7-degrees-N, 72.0-degrees-W) was sampled by the R/V Cape Henlopen and simultaneously imaged by the Jet Propulsion Laboratory's airborne synthetic aperture radar (SAR). Hydrographic measurements show an abrupt surface front separating warm, salty Gulf Stream water in the south from a filament of cool, fresh (<33 practical salinity unit (psu)) water to the north. The filament lies within the stream and is likely water entrained from the continental shelf. The southern boundary of the filament is marked by increased surface wave breaking in a 100- to 200-m-wide zone, accumulations of Sargassum, and an orthogonal velocity change of 20 cm/s. The front is manifested in a sequence of SAR images as a narrow line having returns 1-2 dB higher than background. (A second, transient SAR line occurs near the northern filament boundary.) The observations are compared with model calculations of the surface wave hydrodynamics and radar scattering. The ocean waves are driven by southwesterly 8-m/s winds and interact with the front to produce primarily an enhancement of 2- to 3-m waves over a less-than-or-equal-to200-m-wide region centered downwind of the front. Using a composite scattering radar model along with measured breaking-wave statistics, we show that the observed modulations in the radar backscatter can be accounted for through breaking-wave and tilted Bragg wave scattering effects. These results further show that SAR images of the ocean surface can be exploited for detailed study of particular ocean processes. RP MARMORINO, GO (reprint author), USN,RES LAB,CODE 7250,WASHINGTON,DC 20375, USA. NR 37 TC 22 Z9 22 U1 2 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1994 VL 99 IS C9 BP 18315 EP 18328 DI 10.1029/94JC01643 PG 14 WC Oceanography SC Oceanography GA PG783 UT WOS:A1994PG78300008 ER PT J AU MERMELSTEIN, MD AF MERMELSTEIN, MD TI MIDWAVE AND LONG-WAVE INFRARED RADIANCE AND CLUTTER AT THE OCEAN-SKY HORIZON SO OPTICS LETTERS LA English DT Article AB A statistical analysis is presented for the mean and the clutter radiance emitted by the ocean surface near the horizon and in the absence of direct solar illumination. The calculated midwave and long-wave radiances are given as functions of the environmental and optical parameters and agree with experimentally measured radiance profiles to within 20%. A simple expression for the calculated radiance as a function of wind speed and look direction is obtained by linearizing the radiance as a function of the wave slope. RP MERMELSTEIN, MD (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5622,WASHINGTON,DC 20375, USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1994 VL 19 IS 18 BP 1385 EP 1387 DI 10.1364/OL.19.001385 PG 3 WC Optics SC Optics GA PJ264 UT WOS:A1994PJ26400003 PM 19855527 ER PT J AU SIGALAS, MM PAPACONSTANTOPOULOS, DA AF SIGALAS, MM PAPACONSTANTOPOULOS, DA TI CALCULATIONS OF THE TOTAL-ENERGY, ELECTRON-PHONON INTERACTION, AND STONER PARAMETER FOR METALS SO PHYSICAL REVIEW B LA English DT Article ID DENSITY FUNCTIONAL FORMALISM; TRANSITION-METALS; BAND-STRUCTURE; EXCHANGE; SUSCEPTIBILITY; POTENTIALS; SOLIDS AB Using the augmented-plane-wave method, we performed total-energy calculations for all the metals crystallizing in the hcp structure and for all the 5d metals in the hcp structure. Also, using the predicted equilibrium lattice constants from our present and previous total-energy calculations, we carried out band-structure calculations that explore possibilities for superconductivity and magnetism in all the transition metals in the fee, bcc, and hcp structures. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP SIGALAS, MM (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES LAB,AMES,IA 50011, USA. NR 28 TC 50 Z9 50 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1994 VL 50 IS 11 BP 7255 EP 7261 DI 10.1103/PhysRevB.50.7255 PG 7 WC Physics, Condensed Matter SC Physics GA PJ437 UT WOS:A1994PJ43700001 ER PT J AU MCQUEEN, PG HESS, DW SERENE, JW AF MCQUEEN, PG HESS, DW SERENE, JW TI PSEUDOGAP FORMATION IN THE SYMMETRICAL ANDERSON LATTICE MODEL SO PHYSICAL REVIEW B LA English DT Article ID HUBBARD-MODEL; CE3BI4PT3 AB We present self-consistent calculations for the self-energy and magnetic susceptibility of the two-dimensional (2D) and 3D symmetric Anderson lattice Hamiltonian in the fluctuation exchange approximation. At high temperatures, strong f-electron scattering leads to broad quasiparticle spectral functions, a reduced quasiparticle band gap, and a metallic density of states. As the temperature is lowered, the spectral functions narrow and a pseudogap forms at the characteristic temperature T, at which the width of the quasiparticle spectral function at the gap edge is comparable to the renormalized activation energy. For T << T-z, the pseudogap is approximately equal to the hybridization gap in the bare band structure. The opening of the pseudogap is clearly apparent in both the spin susceptibility and the compressibility. C1 GEORGETOWN UNIV,DEPT PHYS,WASHINGTON,DC 20057. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP MCQUEEN, PG (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. OI Serene, Joseph/0000-0002-3233-2531 NR 18 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1994 VL 50 IS 11 BP 7304 EP 7310 DI 10.1103/PhysRevB.50.7304 PG 7 WC Physics, Condensed Matter SC Physics GA PJ437 UT WOS:A1994PJ43700009 ER PT J AU FERTIG, HA REINECKE, TL AF FERTIG, HA REINECKE, TL TI LOCALIZATION AND DIFFUSION OF ENERGY VIA CONFINED PHONON MODES IN SEMICONDUCTOR SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONS AB We study the effects of disorder on energy transport by confined optical-phonon modes in semiconductor superlattices. We investigate, in particular, whether it is possible to obtain Anderson localization of confined phonon modes by interface and barrier alloy disorder in superlattices like the GaAs/AlxGa1-xAs system. We develop a formalism for describing the transport of kinetic energy through the system and apply a diagrammatic perturbation theory that allows inclusion of disorder scattering. A simple model of the confined phonons shows that the strength of the disorder scattering is far too weak for localization to occur in realistic samples. We find, however, that a crossover from ballistic transport of energy by phonons to diffusive transport is expected as a function of increasing well width and alloy concentration. Possible implications for recent experiments are discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP FERTIG, HA (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1994 VL 50 IS 11 BP 7443 EP 7452 DI 10.1103/PhysRevB.50.7443 PG 10 WC Physics, Condensed Matter SC Physics GA PJ437 UT WOS:A1994PJ43700027 ER PT J AU DUNLAP, BI AF DUNLAP, BI TI CONSTRAINTS ON SMALL GRAPHITIC HELICES SO PHYSICAL REVIEW B LA English DT Note ID CARBON NANOTUBES; TUBULES; MICROTUBULES; GROWTH; FORMS AB A model for small helical carbon tubules is presented. A heptagon-pentagon defect in a perfect fullerene tubule, which is made up entirely of hexagons formed by nearest-neighbor carbon-carbon bonds, bends the tubule at a 30 degrees angle, which is the angle between the axes of the two halves. The tubule circumferences should roughly match. Pentagons and heptagons should be isolated and separated as far as possible. These effects would favor long-range order along the helix, given a driving force for curling during the formation process. RP DUNLAP, BI (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6179,WASHINGTON,DC 20375, USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 17 TC 57 Z9 58 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1994 VL 50 IS 11 BP 8134 EP 8137 DI 10.1103/PhysRevB.50.8134 PG 4 WC Physics, Condensed Matter SC Physics GA PJ437 UT WOS:A1994PJ43700132 ER PT J AU FONDA, RW SPANOS, G VANDERMEER, RA AF FONDA, RW SPANOS, G VANDERMEER, RA TI OBSERVATIONS OF PLATE MARTENSITE IN A LOW-CARBON STEEL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID MORPHOLOGY; AUSTENITE RP FONDA, RW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 12 Z9 12 U1 1 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD SEP 15 PY 1994 VL 31 IS 6 BP 683 EP 688 DI 10.1016/0956-716X(94)90210-0 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NW207 UT WOS:A1994NW20700007 ER PT J AU JENDRASIAK, GL RIBEIRO, AA NAGUMO, MA SCHOEN, PE AF JENDRASIAK, GL RIBEIRO, AA NAGUMO, MA SCHOEN, PE TI A TEMPERATURE STUDY OF DIACETYLENIC PHOSPHATIDYLCHOLINE VESICLES SO BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES LA English DT Article DE DIACETYLENIC PHOSPHOLIPID; LIPID VESICLE; NMR ID TUBULE FORMATION; LIPID-MEMBRANES; ANION BINDING; MICROSTRUCTURES; PHOSPHOLIPIDS; LECITHIN; BILAYERS; NMR; DIFFRACTION; RESONANCE AB Dispersions of the diacetylenic phosphatidylcholine, 1,2-bis(10,12-tricosadiynoyl);sn-glycero-3-phosphocholine, DC8,9PC, undergo a change from vesicles to hollow tubes on cooling. We report here a light scattering and multinuclear NMR study of the lipid vesicles over the temperature range 0-50 degrees C. The 'splitting' of the N+(CH3)(3) resonance increases with decreasing temperature, consistent with the light scattering measurements which show a decrease in vesicle size with decreasing temperature. The NMR spectrum remains well-resolved over this temperature range, even at temperatures as low as 3 degrees C. Phosphorus NMR also indicates that the 'bilayer structure' is maintained over this temperature range. The various proton resonances and the phosphorous signal from the lipid vesicles broaden as the temperature is lowered. These results will be helpful in developing a model for the tubule-forming ability of DC8,9PC. C1 DUKE UNIV,MED CTR,DUKE NMR CTR,DURHAM,NC 27710. DUKE UNIV,MED CTR,DEPT RADIOL,DURHAM,NC 27710. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC. RP JENDRASIAK, GL (reprint author), E CAROLINA UNIV,SCH MED,DEPT RADIAT ONCOL,GREENVILLE,NC 27858, USA. NR 28 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0005-2736 J9 BBA-BIOMEMBRANES JI Biochim. Biophys. Acta-Biomembr. PD SEP 14 PY 1994 VL 1194 IS 2 BP 233 EP 238 DI 10.1016/0005-2736(94)90304-2 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PH001 UT WOS:A1994PH00100003 PM 7918537 ER PT J AU LAHREN, RH AF LAHREN, RH TI CD IMAGING - PARANASAL SINUSES AND ANTERIOR SKULL BASE SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Software Review RP LAHREN, RH (reprint author), USN HOSP,OAK HARBOR,WA 98278, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD SEP 14 PY 1994 VL 272 IS 10 BP 831 EP 832 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA PF188 UT WOS:A1994PF18800039 ER PT J AU JOHNSON, M AF JOHNSON, M TI SPIN-COUPLED RESISTANCE OBSERVED IN FERROMAGNET-SUPERCONDUCTOR-FERROMAGNET TRILAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID BOUNDARY RESISTANCE; INJECTION; INTERFACE; CHARGE; FILMS; FE AB Permalloy-niobium-permalloy trilayers are fabricated in the spin transistor geometry, and the results of transport measurements above and below the superconducting transition temperature T(c) are reported. The data below T(c) show evidence for the injection of nonequilibrium, spin-polarized quasiparticles, and their diffusion across the niobium film. C1 BELLCORE,RED BANK,NJ 07701. RP JOHNSON, M (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 19 TC 80 Z9 81 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 12 PY 1994 VL 65 IS 11 BP 1460 EP 1462 DI 10.1063/1.112015 PG 3 WC Physics, Applied SC Physics GA PG223 UT WOS:A1994PG22300044 ER PT J AU ROLAND, CM SANTANGELO, PG BARAM, Z RUNT, J AF ROLAND, CM SANTANGELO, PG BARAM, Z RUNT, J TI SEGMENTAL RELAXATION IN BLENDS OF POLYCHLOROPRENE AND EPOXIDIZED POLYISOPRENE SO MACROMOLECULES LA English DT Article ID POLYMER BLENDS; FREE-VOLUME; INTERMOLECULAR COOPERATIVITY; POLY(METHYL METHACRYLATE); TEMPERATURE-DEPENDENCE; CHLORINATED POLYMERS; MISCIBILITY; THERMODYNAMICS; DYNAMICS; MIXTURES AB Dynamic mechanical measurements were conducted over a range of frequencies in the glass transition zone of an epoxidized (25 mol %) polyisoprene (EPI), polychloroprene, and miscible mixtures thereof. The neat polymers had nearly equal glass transition temperatures. Furthermore, they were found to exhibit very similar segmental dynamics, including their segmental relaxation times, functions, and temperature dependencies. Interestingly, however, blends containing a relatively high concentration of the EPI had shorter relaxation times (by up to an order of magnitude) than the neat components; that is, segmental relaxation speeds up upon mixing. This behavior is interpreted in terms of the decrease in intermolecular cooperativity in the mixtures relative to the neat components. The decrease is associated with a large positive excess volume of mixing measured for the blends and the consequent increased unoccupied volume. C1 PENN STATE UNIV,DEPT MAT SCI & ENGN,UNIVERSITY PK,PA 16802. RAFAEL,IL-31021 HAIFA,ISRAEL. RP ROLAND, CM (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. RI He, Yong/F-8752-2012 NR 59 TC 29 Z9 29 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 12 PY 1994 VL 27 IS 19 BP 5382 EP 5386 DI 10.1021/ma00097a019 PG 5 WC Polymer Science SC Polymer Science GA PG449 UT WOS:A1994PG44900019 ER PT J AU GORDON, KD WITT, AN CARRUTHERS, GR CHRISTENSEN, SA DOHNE, BC AF GORDON, KD WITT, AN CARRUTHERS, GR CHRISTENSEN, SA DOHNE, BC TI THE FAR-ULTRAVIOLET DUST ALBEDO IN THE UPPER-SCORPIUS SUBGROUP OF THE SCORPIUS-OB2 ASSOCIATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE DUST, EXTINCTION; ISM, INDIVIDUAL (SCORPIUS OB2); OPEN CLUSTERS AND ASSOCIATIONS, INDIVIDUAL (SCORPIUS OB2); RADIATIVE TRANSFER; ULTRAVIOLET, ISM ID REFLECTION NEBULA NGC-7023; SCATTERING PHASE FUNCTION; INTERSTELLAR DUST; GRAINS; STARS; EXTINCTION; CENTAURUS; REGION AB During NRL's Far Ultraviolet Cameras experiment on STS-39, four images of the giant reflection nebula encompassing the Upper Scorpius subgroup of the Sco OB2 association were obtained in two ultraviolet bandpasses with lambda(eff) = 1362 Angstrom and 1769 Angstrom. From these images and IUE and TD-1 stellar spectra, the ratio of nebular to stellar flux was calculated. The ratio ranged from 0.577 to 0.921 at 1362 Angstrom and 0.681 to 0.916 at 1769 Angstrom with the spread in the ratio arising mainly from uncertainties in the sky background. In order to analyze these images, a model utilizing Monte Carlo techniques to describe radiative transfer in a spherical nebula with asymmetrically distributed stars was developed by elaborating on previous work by Witt (1977). This model was used to determine the range of albedos reproducing the observed nebular-to-stellar flux ratios while allowing the scattering phase function asymmetry to vary between 0.0 and 0.8. The resulting albedos were 0.47-0.70 at 1362 Angstrom and 0.55-0.72 at 1769 Angstrom. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP GORDON, KD (reprint author), UNIV TOLEDO,RITTER ASTROPHYS RES CTR,2801 W BANCROFT ST,TOLEDO,OH 43606, USA. OI Witt, Adolf/0000-0003-0760-4483 NR 32 TC 40 Z9 40 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1994 VL 432 IS 2 BP 641 EP 647 DI 10.1086/174602 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PE877 UT WOS:A1994PE87700022 ER PT J AU GAUME, RA FEY, AL CLAUSSEN, MJ AF GAUME, RA FEY, AL CLAUSSEN, MJ TI VLA RECOMBINATION LINE OBSERVATIONS OF THE COMETARY H-II-REGION G34.3+0.2 - DYNAMICS AND PHYSICAL-PROPERTIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE H II REGIONS; ISM, INDIVIDUAL (G34.3+0.2); ISM, KINEMATICS AND DYNAMICS; RADIO LINES, ISM; STARS, FORMATION ID MOLECULAR CORE; AMMONIA OBSERVATIONS; HOT CORE; EMISSION; MAPS AB We have observed the H93 alpha radio recombination line emission toward the cometary H II region G34.3+0.2 component C. A velocity gradient with a total extent of approximate to 35 km s(-1) is found in the H93 alpha line emission perpendicular to the symmetry axis of the cometary H II region. A smaller velocity gradient is found parallel to the symmetry axis. The moving star bow shock model and the champagne outflow model have been suggested to explain observations of G34.3+0.2C. Neither model adequately matches the available velocity data. G34.3+0.2 components A and B are found near G34.3+0.2C. The continuum spectral indices of components A and B are consistent with that expected for an ionized wind outflow. We suggest a qualitative model for the region where the ionizing star of the cometary H II region G34.3+0.2C photoevaporates material from a hot ultracompact molecular core found just to the east of the continuum emission. Interaction between the ionized gas of the cometary H II region and winds from components A and B may explain many of the current observations. We have also mapped the 6(16) --> 5(23) transition of H2O toward G34.3+0.2. We find strong H2O maser emission within a approximate to 50'' x 30'' region. Some of the H2O masers are projected onto sources of radio continuum emission, but others are found well separated from radio continuum emission. C1 NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. RP GAUME, RA (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7210,WASHINGTON,DC 20375, USA. NR 32 TC 51 Z9 51 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1994 VL 432 IS 2 BP 648 EP 655 DI 10.1086/174603 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PE877 UT WOS:A1994PE87700023 ER PT J AU KEENAN, FP HARRA, LK DOSCHEK, GA COOK, JW AF KEENAN, FP HARRA, LK DOSCHEK, GA COOK, JW TI THE DETERMINATION OF ELECTRON-DENSITIES IN THE SOLAR ATMOSPHERE FROM THE 1718.56-ANGSTROM 1486.51-ANGSTROM EMISSION-LINE RATION IN N-IV SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ACTIVITY; SUN, ATMOSPHERE; SUN, CORONA; SUN, UV RADIATION ID IMPACT EXCITATION RATES; COLLISION STRENGTHS; C-III; SUN; SPECTRUM; IONS AB The theoretical electron density sensitive emission-line ratio R = I(1718.56 Angstrom)/I(1486.51 Angstrom) in N IV is presented for a range of N-e (similar or equal to 10(10)-10(12) cm(-3)) applicable to higher density solar plasmas, such as active regions. A comparison of these calculations with the observed values of R of several solar features obtained with the Naval Research Laboratory's S082B spectrograph on board Skylab reveals general agreement between theory and observation at pointings just above the limb, where line blends with N IV 1718.56 Angstrom should be insignificant, which provides experimental support for the accuracy of the line ratio calculations. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,NORTH IRELAND. NR 19 TC 3 Z9 3 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1994 VL 432 IS 2 BP 806 EP 808 DI 10.1086/174618 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PE877 UT WOS:A1994PE87700038 ER PT J AU KEENAN, FP CONLON, ES FOSTER, VJ TAYAL, SS WIDING, KG AF KEENAN, FP CONLON, ES FOSTER, VJ TAYAL, SS WIDING, KG TI FE XVI LINE RATIOS IN THE SUN SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; SUN, FLARES; SUN, UV RADIATION ID EXTREME-ULTRAVIOLET SPECTRUM; RECOMBINATION RATES; XUV OBSERVATIONS; COMPACT FLARE; SOLAR-FLARES; IRON; DIAGNOSTICS; IONIZATION; STRENGTHS; SKYLAB AB Recent R-matrix calculations of electron impact excitation rates in Fe XVI are used to derive the emmission-line ratios R(1) = I(251.07 Angstrom)/I(335.40 Angstrom), R(2) = I(262.98 Angstrom)/I(335.40 Angstrom), and R(3) = I(265.00 Angstrom) /I(335.40 Angstrom). A comparison of these with solar observational data obtained by the Naval Research Laboratory's S082A slitless spectrograph on board Skylab reveals generally good agreement between theory and observation, which provides experimental support for the accuracy of the atomic data adopted in the analysis. However, several of the measured ratios are much larger than theory predicts, which is probably due to saturation of the strong 335.40 Angstrom line on the photographic film used to record the S082A data. The potential usefulness of R(1), R(2), and R(3) as electron temperature diagnostics for the solar corona is briefly discussed. C1 CLARK ATLANTA UNIV,DEPT PHYS,ATLANTA,GA 30314. CLARK ATLANTA UNIV,CTR THEORET STUDIES PHYS SYST,ATLANTA,GA 30314. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 30 TC 9 Z9 9 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1994 VL 432 IS 2 BP 809 EP 811 DI 10.1086/174619 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PE877 UT WOS:A1994PE87700039 ER PT J AU VANDYK, SD WEILER, KW SRAMEK, RA RUPEN, MP PANAGIA, N AF VANDYK, SD WEILER, KW SRAMEK, RA RUPEN, MP PANAGIA, N TI SN-1993J - THE EARLY RADIO-EMISSION AND EVIDENCE FOR A CHANGING PRESUPERNOVA MASS-LOSS RATE SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (NGC-3031); RADIO CONTINUUM, STARS; STARS, MASS LOSS; SUPERNOVAE, GENERAL; SUPERNOVAE, INDIVIDUAL (SN-1993J) ID SUPERNOVAE AB We present daily-to-weekly monitoring of the first 8 months of radio emission from supernova (SN) 1993J using the Very Large Array at five wavelengths, providing the most detailed radio light curves ever established for an SN. While the radio emission evolves regularly in both time and frequency, the usual form of the SN shock/circumstellar medium interaction model does not adequately describe the observations. In particular, for a spherically symmetric geometry, the circumstellar density profile is flatter (rho(CSM) proportional-to r-1.5) than that (rho(CSM) proportional-to r-2) generally assumed for a constant mass-loss rate, constant-velocity stellar wind. This is interpreted as a decrease in the pre-SN mass-loss rate (or increase in wind velocity) immediately prior to explosion. Additionally, the rate of increase in the early radio emission at each frequency cannot simply be described as due to decreasing external absorption by a uniform medium, but requires the presence of higher density ''clumps'' or ''filaments'' embedded in the stellar wind. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP VANDYK, SD (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. OI Van Dyk, Schuyler/0000-0001-9038-9950 NR 26 TC 111 Z9 111 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1994 VL 432 IS 2 BP L115 EP L118 DI 10.1086/187525 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PE878 UT WOS:A1994PE87800011 ER PT J AU MARTIN, JH COALE, KH JOHNSON, KS FITZWATER, SE GORDON, RM TANNER, SJ HUNTER, CN ELROD, VA NOWICKI, JL COLEY, TL BARBER, RT LINDLEY, S WATSON, AJ VANSCOY, K LAW, CS LIDDICOAT, MI LING, R STANTON, T STOCKEL, J COLLINS, C ANDERSON, A BIDIGARE, R ONDRUSEK, M LATASA, M MILLERO, FJ LEE, K YAO, W ZHANG, JZ FRIEDERICH, G SAKAMOTO, C CHAVEZ, F BUCK, K KOLBER, Z GREENE, R FALKOWSKI, P CHISHOLM, SW HOGE, F SWIFT, R YUNGEL, J TURNER, S NIGHTINGALE, P HATTON, A LISS, P TINDALE, NW AF MARTIN, JH COALE, KH JOHNSON, KS FITZWATER, SE GORDON, RM TANNER, SJ HUNTER, CN ELROD, VA NOWICKI, JL COLEY, TL BARBER, RT LINDLEY, S WATSON, AJ VANSCOY, K LAW, CS LIDDICOAT, MI LING, R STANTON, T STOCKEL, J COLLINS, C ANDERSON, A BIDIGARE, R ONDRUSEK, M LATASA, M MILLERO, FJ LEE, K YAO, W ZHANG, JZ FRIEDERICH, G SAKAMOTO, C CHAVEZ, F BUCK, K KOLBER, Z GREENE, R FALKOWSKI, P CHISHOLM, SW HOGE, F SWIFT, R YUNGEL, J TURNER, S NIGHTINGALE, P HATTON, A LISS, P TINDALE, NW TI TESTING THE IRON HYPOTHESIS IN ECOSYSTEMS OF THE EQUATORIAL PACIFIC-OCEAN SO NATURE LA English DT Article ID SUB-ARCTIC PACIFIC; MARINE-PHYTOPLANKTON; PRODUCTIVITY; ENVIRONMENTS; LIMITATION; SEAWATER; GROWTH; WATER; SEA AB The idea that iron might limit phytoplankton growth in large regions of the ocean has been tested by enriching an area of 64 km(2) in the open equatorial Pacific Ocean with iron. This resulted in a doubling of plant biomass, a threefold increase In chlorophyll and a fourfold increase in plant production. Similar increases were found in a chlorophyll-rich plume downstream of the Galapagos Islands, which was naturally enriched in iron. These findings indicate that iron limitation can control rates of phytoplankton productivity and biomass in the ocean. C1 MOSS LANDING MARINE LABS,MOSS LANDING,CA 95039. DUKE UNIV,MARINE LAB,BEAUFORT,NC 28516. PLYMOUTH MARINE LAB,PLYMOUTH PL1 3DH,ENGLAND. USN,POSTGRAD SCH,MONTEREY,CA 93943. UNIV HAWAII,DEPT OCEANOG,HONOLULU,HI 96822. UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,MIAMI,FL 33149. MONTEREY BAY AQUARIUM RES INST,PACIFIC GROVE,CA 93950. BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973. MIT,DEPT CIVIL & ENVIRONM ENGN,RALPH M PARSONS LAB,CAMBRIDGE,MA 02139. NASA,GODDARD SPACE FLIGHT CTR,WALLOPS FLIGHT FACIL,WALLOPS ISL,VA 23337. UNIV E ANGLIA,SCH ENVIRONM SCI,NORWICH NR4 7TJ,NORFOLK,ENGLAND. TEXAS A&M UNIV,DEPT METEOROL,COLLEGE STN,TX 77843. RI Zhang, Jia-Zhong/B-7708-2008; Ondrusek, Michael/F-5617-2010; LISS, Peter/A-8219-2013; Hatton, Angela/D-6196-2013; Nightingale, Philip/I-4324-2012; Lindley, Steven/G-3997-2014; Latasa, Mikel/D-2202-2011; Johnson, Kenneth/F-9742-2011 OI Zhang, Jia-Zhong/0000-0002-1138-2556; Ondrusek, Michael/0000-0002-5311-9094; Nightingale, Philip/0000-0001-7177-5469; Lindley, Steven/0000-0001-9556-0411; Latasa, Mikel/0000-0002-8202-0923; Johnson, Kenneth/0000-0001-5513-5584 NR 52 TC 915 Z9 978 U1 12 U2 177 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD SEP 8 PY 1994 VL 371 IS 6493 BP 123 EP 129 DI 10.1038/371123a0 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PF191 UT WOS:A1994PF19100054 ER PT J AU WILLIAMS, KJ AF WILLIAMS, KJ TI NONLINEAR MECHANISMS IN MICROWAVE PHOTODETECTORS OPERATED WITH HIGH INTRINSIC REGION ELECTRIC-FIELDS SO APPLIED PHYSICS LETTERS LA English DT Article ID PHOTODIODE AB Measurements and simulations to determine the contributing nonlinear mechanisms in microwave photodetectors operated with high intrinsic region electric fields are presented. An important component of the nonlinear behavior is attributed to absorption in undepleted material adjacent to the depletion region, limiting the attainable device linearity. With as little as 10 nm of undepleted absorbing material, the second harmonic of a 5 GHz fundamental frequency at 1 mA of average detector current can be -60 dBc. Linearity improvements up to 50 dB should be possible if photodetectors can be fabricated with strictly depleted absorbing regions. RP WILLIAMS, KJ (reprint author), USN,RES LAB,CODE 5670,WASHINGTON,DC 20375, USA. NR 8 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 5 PY 1994 VL 65 IS 10 BP 1219 EP 1221 DI 10.1063/1.112076 PG 3 WC Physics, Applied SC Physics GA PE880 UT WOS:A1994PE88000006 ER PT J AU CARLOS, WE PROKES, SM AF CARLOS, WE PROKES, SM TI LIGHT-INDUCED ELECTRON-SPIN-RESONANCE IN POROUS SILICON SO APPLIED PHYSICS LETTERS LA English DT Article ID THERMAL DONORS; LUMINESCENCE; CENTERS; SPECTRA; MODEL AB We report on the observation of a new metastable light induced defect center in porous silicon which has a g tensor with [110] symmetry and which is similar to the thermal donor, NL8, seen in thermally annealed Si. The optical response has an onset in the vicinity of the Si indirect band gap. The time dependence of the response has a sharp rise followed by a nearly saturated regime. Changing to a higher photon energy then results in another marked increase in the response. We suggest that this dependence of the absorption on excitation energy reflects the distribution of crystallite sizes. We observe that near ultraviolet light significantly bleaches the signal. RP CARLOS, WE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 18 Z9 18 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 5 PY 1994 VL 65 IS 10 BP 1245 EP 1247 DI 10.1063/1.112084 PG 3 WC Physics, Applied SC Physics GA PE880 UT WOS:A1994PE88000015 ER PT J AU LANDWEHR, CE BULL, AR MCDERMOTT, JP CHOI, WS AF LANDWEHR, CE BULL, AR MCDERMOTT, JP CHOI, WS TI A TAXONOMY OF COMPUTER-PROGRAM SECURITY FLAWS SO ACM COMPUTING SURVEYS LA English DT Article DE ERROR DEFECT CLASSIFICATION; SECURITY FLAW; TAXONOMY AB An organized record of actual flaws can be useful to computer system designers, programmers, analysts, administrators, and users. This survey provides a taxonomy for computer program security flaws, with an Appendix that documents 50 actual security flaws. These flaws have all been described previously in the open literature, but in widely separated places. For those new to the field of computer security, they provide a good introduction to the characteristics of security flaws and how they can arise. Because these flaws were not randomly selected from a valid statistical sample of such flaws, we make no strong claims concerning the likely distribution of actual security flaws within the taxonomy. However, this method of organizing security flaw data can help those who have custody of more representative samples to organize them and to focus their efforts to remove and, eventually, to prevent the introduction of security flaws. RP LANDWEHR, CE (reprint author), USN, RES LAB, DIV INFORMAT TECHNOL, WASHINGTON, DC 20375 USA. NR 30 TC 109 Z9 120 U1 1 U2 6 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA SN 0360-0300 EI 1557-7341 J9 ACM COMPUT SURV JI ACM Comput. Surv. PD SEP PY 1994 VL 26 IS 3 BP 211 EP 254 DI 10.1145/185403.185412 PG 44 WC Computer Science, Theory & Methods SC Computer Science GA PW135 UT WOS:A1994PW13500001 ER PT J AU VANDERMEER, RA HU, H AF VANDERMEER, RA HU, H TI ON THE GRAIN-GROWTH EXPONENT OF PURE IRON SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID COMPUTER-SIMULATION; 3 DIMENSIONS; MICROSTRUCTURE; CERAMICS; METALS; MODEL AB Grain growth data on zone-refined iron were reanalyzed quantitatively to take into account the initial grain size and specimen thickness effect. The deviations from parabolic growth noted in an earlier analysis [Can. Metall. Q. 13, 275 (1974)] are attributed to the use of the approximate Beck formula (lambda congruent-to K . t(n)) for grain growth kinetics which does not take these two important factors into account. Based on the new analysis, grain growth in zone-refined iron over the entire range of temperatures studied can be understood in terms of a single, thermally-activated rate process with an activation energy approximately the same as that for lattice self-diffusion. Furthermore, it is not necessary to invoke a non-linear velocity/driving force relationship to understand the kinetics. The high activation energy may be caused by an unknown impurity present in the iron which gave rise to an impurity drag effect. C1 UNIV PITTSBURGH, PITTSBURGH, PA 15261 USA. RP VANDERMEER, RA (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 32 TC 50 Z9 52 U1 3 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD SEP PY 1994 VL 42 IS 9 BP 3071 EP 3075 DI 10.1016/0956-7151(94)90404-9 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PB268 UT WOS:A1994PB26800017 ER PT J AU DANKO, JC LUNDIN, CD NOLTING, EE AF DANKO, JC LUNDIN, CD NOLTING, EE TI HIGH-ENERGY ELECTRON-BEAM TECHNOLOGY SO ADVANCED MATERIALS & PROCESSES LA English DT Article C1 UNIV TENNESSEE,CTR MAT PROC,KNOXVILLE,TN. UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN. USN,CTR SURFACE WARFARE,DAHLGREN DIV,CHARGED PARTICLE BEAM PROGRAM OFF,WHITE OAK,MD. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD SEP PY 1994 VL 146 IS 3 BP 35 EP 37 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA QK863 UT WOS:A1994QK86300003 ER PT J AU TICHENOR, JR MILLER, RC WOLF, EJ AF TICHENOR, JR MILLER, RC WOLF, EJ TI RISK OF EYE SPLASH IN OBSTETRIC PROCEDURES SO AMERICAN JOURNAL OF PERINATOLOGY LA English DT Article DE INFECTION CONTROL; EYE INFECTIONS; OBSTETRICS AB A prospective cross-sectional study was designed to determine the rates of upper facial splash during obstetric deliveries. Macroscopic splashes on the attached eye shields of surgical masks, worn for obstetric deliveries were enumerated for a sample of parturients during a 3-month period. Masks were collected for 68 vaginal and 44 cesarean deliveries, 31% of all deliveries during the study period. For cesarean deliveries, 68% (30) of all masks worn by primary surgeons had at least one splash; 57% (17) of which were heavily contaminated (more than five splashes). For the first assistant, 68% (30) of all masks had at least one splash; 23% (7) of which were heavily contaminated. During vaginal deliveries 44% (30) of masks worn by the delivering physician had at least one splash; 20% (6) of which were heavily contaminated. The primary surgeon in a cesarean section was 1.6 times as likely to be splashed (P <0.04) when compared with vaginal deliveries and 4.6 time as likely to be heavily contaminated (P <0.003). Estimated blood loss and the rate of eye splash were linearly related. Method of delivery was not independently associated with eye splash. These findings suggest that the risk of contamination by splash during obstetric procedures is high, particularly for cesarean deliveries because these deliveries tend to have greater blood losses. RP TICHENOR, JR (reprint author), USN,MED CTR,DEPT OBSTET & GYNECOL,BETHESDA,MD 20814, USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU THIEME MEDICAL PUBL INC PI NEW YORK PA 381 PARK AVE SOUTH, NEW YORK, NY 10016 SN 0735-1631 J9 AM J PERINAT JI Am. J. Perinatol. PD SEP PY 1994 VL 11 IS 5 BP 359 EP 361 DI 10.1055/s-2007-994555 PG 3 WC Obstetrics & Gynecology; Pediatrics SC Obstetrics & Gynecology; Pediatrics GA PF977 UT WOS:A1994PF97700014 PM 7993519 ER PT J AU HOWDEN, FM MILLS, LR RUBIN, JW AF HOWDEN, FM MILLS, LR RUBIN, JW TI CROHNS-DISEASE OF THE ESOPHAGUS SO AMERICAN SURGEON LA English DT Article ID UPPER GASTROINTESTINAL-TRACT AB We report a case of Crohn's esophagitis involving the entire intrathoracic esophagus, and without evidence of inflammatory bowel disease elsewhere, that was treated successfully with esophagectomy. The clinicopathologic features and the literature are reviewed. C1 USN,THORAC & CARDIAC SURG SECT,AUGUSTA,GA. MED COLL GEORGIA HOSP & CLIN,AUGUSTA,GA. NR 22 TC 14 Z9 15 U1 0 U2 0 PU SOUTHEASTERN SURGICAL CONGRESS PI ATLANTA PA 1776 PEACHTREE RD, NW., SUITE 410N, ATLANTA, GA 30309-2352 SN 0003-1348 J9 AM SURGEON JI Am. Surg. PD SEP PY 1994 VL 60 IS 9 BP 656 EP 660 PG 5 WC Surgery SC Surgery GA PD614 UT WOS:A1994PD61400003 PM 8060035 ER PT J AU NOWICKI, JL JOHNSON, KS COALE, KH ELROD, VA LIEBERMAN, SH AF NOWICKI, JL JOHNSON, KS COALE, KH ELROD, VA LIEBERMAN, SH TI DETERMINATION OF ZINC IN SEAWATER USING FLOW-INJECTION ANALYSIS WITH FLUOROMETRIC DETECTION SO ANALYTICAL CHEMISTRY LA English DT Article ID NORTH PACIFIC; SEA-WATER; CADMIUM; COPPER; NICKEL; OCEAN; IRON; COBALT; LEAD AB A sensitive technique for the shipboard determination of zinc in seawater has been developed. The technique couples flow injection analysis with fluorometric detection (FIA-FL). A cation exchange column was used to separate zinc from interfering alkali and alkaline earth ions and to concentrate Zn from seawater. The organic indicator ligand, p-tosyl-8-aminoquinoline, was used to form a complex with zinc, the fluorescence of which was determined with a flow-through fluorometer. The detection limit (defined as three times the standard deviation of the blank, n = 4) was 0.1 nM for a 4.4-mL sample. The precision based on the replicate analysis of samples containing 4.3 nM Zn was +/-6% (n = 5). A single sample can be analyzed in 6 min. The technique was determined to be accurate on the basis of analysis of the standard seawater solutions CASS-2 and NASS-2 and by comparison with previous reliable investigations. A typical profile of 12 samples along with standards and blanks can be completed in triplicate in 5.5 h. C1 MONTEREY BAY AQUARIUM RES INST,PACIFIC GROVE,CA 93950. USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,RDT&E DIV,SAN DIEGO,CA 92152. RP NOWICKI, JL (reprint author), MOSS LANDING MARINE LABS,POB 450,MOSS LANDING,CA 95039, USA. RI Johnson, Kenneth/F-9742-2011 OI Johnson, Kenneth/0000-0001-5513-5584 NR 27 TC 38 Z9 38 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1994 VL 66 IS 17 BP 2732 EP 2738 DI 10.1021/ac00089a021 PG 7 WC Chemistry, Analytical SC Chemistry GA PD717 UT WOS:A1994PD71700023 ER PT J AU HOLMES, M WATERS, J LEIVERS, D BURGER, G AF HOLMES, M WATERS, J LEIVERS, D BURGER, G TI PROPHYLACTIC EPIDURAL BLOOD PATCH VERSUS PROPHYLACTIC THEOPHYLLINE FOLLOWING ACCIDENTAL DURAL PUNCTURE SO ANESTHESIOLOGY LA English DT Meeting Abstract C1 USN,MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD SEP PY 1994 VL 81 IS 3A SU S BP A1177 EP A1177 PG 1 WC Anesthesiology SC Anesthesiology GA PJ091 UT WOS:A1994PJ09101176 ER PT J AU SCANLON, T WATERS, J HOWARD, R LEIVERS, D BURGER, G AF SCANLON, T WATERS, J HOWARD, R LEIVERS, D BURGER, G TI MINOR ELECTROLYTES IN STEWART ACID-BASE APPROACH IN THE HYPOXIC RABBIT SO ANESTHESIOLOGY LA English DT Meeting Abstract C1 USN,MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. NR 2 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD SEP PY 1994 VL 81 IS 3A SU S BP A895 EP A895 PG 1 WC Anesthesiology SC Anesthesiology GA PJ091 UT WOS:A1994PJ09100894 ER PT J AU FLEMING, B AF FLEMING, B TI WOOLF CUBS, CURRENT FICTION + CONTEMPORARY NOVELS AND SHORT-STORIES FROM THE EARLY 1990S SO ANTIOCH REVIEW LA English DT Review RP FLEMING, B (reprint author), USN,ANNAPOLIS,MD 21402, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU ANTIOCH REVIEW PI YELLOW SPRINGS PA BOX 148, YELLOW SPRINGS, OH 45387 SN 0003-5769 J9 ANTIOCH REV JI Antioch Rev. PD FAL PY 1994 VL 52 IS 4 BP 549 EP 565 PG 17 WC Literary Reviews SC Literature GA PY625 UT WOS:A1994PY62500001 ER PT J AU HOLLAND, GE SEELY, JF MCCOY, RP DYMOND, KF ROLLINS, C CORSON, M AF HOLLAND, GE SEELY, JF MCCOY, RP DYMOND, KF ROLLINS, C CORSON, M TI EFFECT OF ENERGETIC ELECTRON AND PROTON-BOMBARDMENT ON THE REFLECTIVE OF SILICON-CARBIDE MIRRORS IN THE EXTREME-ULTRAVIOLET REGION SO APPLIED OPTICS LA English DT Note AB Chemical-vapor-deposited silicon-carbide mirrors were exposed to bombardment by 95-keV electrons and 100-keV protons with accumulated fluxes comparable with those expected in low-altitude Earth orbit for simulated periods of as many as 5 years. The reflectances of four mirrors were measured at five wavelengths (58.4, 73.6, 104.8, 121.6, and 161 nm) and at 11 angles of incidence from 5-degrees to 80-degrees. The electron and proton exposure resulted in no significant change in the reflectances of the mirrors. C1 USN, RES LAB, RES INSTRUMENTS INC, WASHINGTON, DC 20375 USA. RP HOLLAND, GE (reprint author), SFA INC, 1401 MCCORMICK DR, LANDOVER, MD 20785 USA. OI Dymond, Kenneth/0000-0001-8060-9016 NR 3 TC 3 Z9 3 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 1 PY 1994 VL 33 IS 25 BP 5902 EP 5905 PG 4 WC Optics SC Optics GA PF320 UT WOS:A1994PF32000008 PM 20935995 ER PT J AU MERMELSTEIN, MD SHETTLE, EP TAKKEN, EH PRIEST, RG AF MERMELSTEIN, MD SHETTLE, EP TAKKEN, EH PRIEST, RG TI INFRARED RADIANCE AND SOLAR GLINT AT THE OCEAN SKY HORIZON SO APPLIED OPTICS LA English DT Article ID SEA-SURFACE; SCATTERING AB An analytic model is developed for the mean and clutter infrared radiance emitted from the ocean surface near the horizon and in the presence of solar glint. The model is based on the identification of a characteristic facet dimension over which the ocean surface is essentially flat. Fluctuations in the facet orientation generated by the water wave motion are modeled by a parameterized wave height power spectral density that provides the two orthogonal wave slope variances. The mean and root-mean-square facet radiances are calculated with Gaussian probability-density functions for the wave slopes. One can determine the number of facets within the field of view of a single detector by estimating the exposed ocean area and dividing by the facet area. This estimation takes into account shadowing effects of the swell wave, the swell wavelength, and the transverse detector field of view. The number of exposed facets together with the central-limit theorem permits computation of the radiance clutter as a function of look-down angle below the horizon. Vertical radiance profiles, parameterized by the azimuthal offset from the solar position, are calculated over a sensor look-down angle range of +/-50 mrad about the horizon. The results of this analysis are compared with infrared radiance measurements of the ocean surface near the horizon and in the presence of solar glint. Agreement between the measured and calculated values of the mean and clutter radiances is good. C1 USN, RES LAB, DIV OPT SCI, CODE 5622, WASHINGTON, DC 20375 USA. NR 25 TC 30 Z9 32 U1 1 U2 10 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 1 PY 1994 VL 33 IS 25 BP 6022 EP 6034 PG 13 WC Optics SC Optics GA PF320 UT WOS:A1994PF32000028 PM 20936015 ER PT J AU HETTER, RD SEGALL, DO BLOXOM, BM AF HETTER, RD SEGALL, DO BLOXOM, BM TI A COMPARISON OF ITEM CALIBRATION MEDIA IN COMPUTERIZED ADAPTIVE TESTING SO APPLIED PSYCHOLOGICAL MEASUREMENT LA English DT Article DE COMPUTERIZED ADAPTIVE TESTING; ITEM CALIBRATION; ITEM PARAMETER ESTIMATION; ITEM RESPONSE THEORY; MEDIUM OF ADMINISTRATION; TRAIT LEVEL ESTIMATION AB A concern in computerized adaptive testing is whether data for calibrating items can be collected from either a paper-and-pencil (P&P) or a computer administration of the items. Fixed blocks of power test items were administered by computer to one group of examinees and by P&P to a second group. These data were used to obtain computer-based and P&P-based three-parameter logistic model parameters of the items. Then each set of parameters was used to estimate item response theory pseudo-adaptive scores for a third group of examinees who had received all of the items by computer. The effect of medium of administration of the calibration items was assessed by comparative analyses of the adaptive scores using structural modeling. The results support the use of item parameters calibrated from either P&P or computer administrations for use in computerized adaptive power tests. The calibration medium did not appear to alter the constructs measured by the adaptive test or the reliability of the adaptive test scores. RP HETTER, RD (reprint author), USN,CTR PERSONNEL RES & DEV,DEPT PERSONNEL SYST,CODE 12,53335 RYNE RD,SAN DIEGO,CA 92152, USA. NR 15 TC 4 Z9 4 U1 0 U2 1 PU APPLIED PSYCHOLOGICAL MEASUREMENT INC PI MINNEAPOLIS PA N657 ELLIOTT HALL, UNIV OF MINNESOTA, MINNEAPOLIS, MN 55455-0344 SN 0146-6216 J9 APPL PSYCH MEAS JI Appl. Psychol. Meas. PD SEP PY 1994 VL 18 IS 3 BP 197 EP 204 DI 10.1177/014662169401800301 PG 8 WC Social Sciences, Mathematical Methods; Psychology, Mathematical SC Mathematical Methods In Social Sciences; Psychology GA QZ560 UT WOS:A1994QZ56000001 ER PT J AU LOONEY, R AF LOONEY, R TI AFTER THE STORM - THE CHANGING MILITARY BALANCE IN THE MIDDLE-EAST - CORDESMAN,AH SO ARMED FORCES & SOCIETY LA English DT Book Review RP LOONEY, R (reprint author), USN,POSTGRAD SCH,DEPT NATL SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD FAL PY 1994 VL 21 IS 1 BP 162 EP 165 DI 10.1177/0095327X9402100116 PG 4 WC Political Science; Sociology SC Government & Law; Sociology GA PU001 UT WOS:A1994PU00100015 ER PT J AU LEGGETT, SK HARRIS, HC DAHN, CC AF LEGGETT, SK HARRIS, HC DAHN, CC TI LOW-MASS STARS IN THE CENTRAL REGION OF THE HYADES CLUSTER SO ASTRONOMICAL JOURNAL LA English DT Article ID NEARBY M-DWARFS; BROWN DWARFS; LUMINOSITY FUNCTION; MAIN-SEQUENCE; CHROMOSPHERIC ACTIVITY; THEORETICAL-MODELS; RADIAL-VELOCITY; PROPER MOTIONS; DISTANCE; EVOLUTION AB New V and I photometry of Hyades candidates is presented and used to improve the determination of the low-mass stellar population of the central 5 degrees X5 degrees region of the cluster. We use color-magnitude diagrams appropriate for the metallicity of the cluster to identify likely members from proper motion and photometric surveys, and to identify possible unresolved Hyades binaries. The resulting candidate sample consists of 49 objects (38 apparently single stars plus 11 probable unresolved binaries) with 0.4 greater than or equal to, mass/M.greater than or equal to 0.1 which have both proper motions and colors consistent with cluster membership, plus 13 faint (19 less than or equal to V less than or equal to 22.5) objects around the hydrogen-burning limit which lack proper motions but which have colors consistent with membership. We present new H alpha observations which further support the contention that Hyades members less massive than about 0.3M. all have H alpha in emission, in agreement with the expectation of longer spindown time scales for lower mass stars. A cluster luminosity function based on 63 individual stars is presented. Comparison with theoretical models indicates that the present cluster mass function is flat at these low masses, implying that brown dwarfs make up no more than similar to 10% of the total mass of the cluster. C1 UNIV SPACE RES ASSOC,HILO,HI 96720. JOINT ASTRON CTR,HILO,HI 96720. RP LEGGETT, SK (reprint author), USN OBSERV,POB 1149,FLAGSTAFF,AZ 86002, USA. OI Leggett, Sandy/0000-0002-3681-2989 NR 65 TC 39 Z9 39 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD SEP PY 1994 VL 108 IS 3 BP 944 EP 963 DI 10.1086/117124 PG 20 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PD586 UT WOS:A1994PD58600015 ER PT J AU EDGE, AC BOHRINGER, H GUZZO, L COLLINS, CA NEUMANN, D CHINCARINI, G DEGRANDI, S DUMMLER, R EBELING, H SCHINDLER, S SEITTER, W VETTOLANI, P BRIEL, U CRUDDACE, R GRUBER, R GRUSKY, R GURSKY, H HARTNER, G MACGILLIVRAY, HT SCHUECKER, P SHAVER, P VOGES, W WALLIN, J WOLTER, A ZAMORANI, G AF EDGE, AC BOHRINGER, H GUZZO, L COLLINS, CA NEUMANN, D CHINCARINI, G DEGRANDI, S DUMMLER, R EBELING, H SCHINDLER, S SEITTER, W VETTOLANI, P BRIEL, U CRUDDACE, R GRUBER, R GRUSKY, R GURSKY, H HARTNER, G MACGILLIVRAY, HT SCHUECKER, P SHAVER, P VOGES, W WALLIN, J WOLTER, A ZAMORANI, G TI A GIANT ARC IN A ROSAT-DETECTED CLUSTER OF GALAXIES SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE CLUSTERS OF GALAXIES; X-RAY ASTRONOMY; GRAVITATIONAL LENSING ID X-RAY DATA; EXOSAT OBSERVATIONS; A-370 AB In this letter we report on the serendipitous discovery of a giant arc in the Abell Supplementary cluster S295 during optical follow-up observations of clusters detected in the ROSAT All-Sky Survey. The cluster has a redshift of 0.30 and a velocity dispersion of sigma(upsilon) congruent-to 900 km s-1. This is the first giant arc newly found in a ROSAT Survey cluster, indicating the potential advantage of searching for giant arcs in X-ray selected clusters. C1 MAX PLANCK INST EXTRATERR PHYS, D-85740 GARCHING, GERMANY. OSSERV ASTRON MERATE, I-22055 MERATE, ITALY. LIVERPOOL JOHN MOORES UNIV, SCH CHEM & PHYS SCI, LIVERPOOL, ENGLAND. UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY. UNIV MUNSTER, INST ASTRON, W-4400 MUNSTER, GERMANY. UNIV MILAN, DIPARTIMENTO FIS, I-20133 MILAN, ITALY. USN, RES LAB, DIV SPACE SCI, WASHINGTON, DC 20375 USA. ROYAL OBSERV, EDINBURGH EH9 3HJ, MIDLOTHIAN, SCOTLAND. ESO, D-85748 GARCHING, GERMANY. OSSERV ASTRON BOLOGNA, I-40137 BOLOGNA, ITALY. RP EDGE, AC (reprint author), UNIV CAMBRIDGE, INST ASTRON, MADINGLEY RD, CAMBRIDGE CB3 0HA, ENGLAND. NR 20 TC 11 Z9 11 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD SEP PY 1994 VL 289 IS 1 BP L34 EP L36 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PE582 UT WOS:A1994PE58200010 ER PT J AU ULMER, MP LOMATCH, S MATZ, SM GRABELSKY, DA PURCELL, WR GROVE, JE JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS CAMERON, RA JUNG, GV AF ULMER, MP LOMATCH, S MATZ, SM GRABELSKY, DA PURCELL, WR GROVE, JE JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS CAMERON, RA JUNG, GV TI OSSE OBSERVATIONS OF THE CRAB PULSAR SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, OBSERVATIONS; PULSARS, INDIVIDUAL (CRAB) ID RAPIDLY SPINNING PULSARS; GAMMA-RAY LINE; ENERGETIC RADIATION; FIGARO-II; X-RAYS; NEBULA; SPECTROMETER; EMISSION; SPECTRUM; GAPS AB We present results of the Compton Gamma-Ray Observatory OSSE observations of the Crab pulsar, made during MJD 48373 - 48406 (1991 April 27-1991 May 30) and MJD 48798 - 48804 (1992 June 25-1992 July 1). Pulsar light curves and spectra over the approximately 0.05 to 10 MeV range are presented. The arrival time of the gamma-ray peak and the radio peak agree to within 30 mus, which is better than the approximately 300 mus accuracy of the measurements. The overall pulse phase averaged spectrum in the 0.1-10 MeV range is well-fit by a power law of the form 0.05 x (E/0.13 MeV)-(1.99+/-0.03) photons cm-2 s-1. The outer-gap model (with gap parameter equal to 0.46) provided to us by Ho agrees with the data to better than 20%. The spectra of the bridge and second peak are slightly harder than the first peak as measured by the hardness ratio (approximately 110-220 keV)/(approximately 50-105 keV): P1 = 0.54 +/- 0.01, P2 = 0.63 +/- 0.01, bridge = 0.68 +/- 0.03. The phase of the two peaks in the light curve is constant over the 50-550 keV range to within the accuracy of the measurements (better than 0.02 in phase). No evidence was found for variability of the light curve on timescales from 2 minutes (less than a factor of 1.8) to 1 year (less than a factor of -1.06), where these are 3 sigma upper limits. However, when we examine the historical database, we find, in agreement with Nolan et al. (1993), that there is evidence for a 13 year variation in the ratio of the intensity of peak 2 to peak 1. We show that if this is interpreted as being due to precession (which changes the relative view of the intrinsic gamma-ray pulse as seen on earth), the variation is consistent with models of neutron star structure. The optical data may be in conflict with the interpretation however. We found no statistically significant lines in the 50-550 keV range in the spectrum. The average 3 sigma upper limits in 10(-3) photons cm-2 s-1 for lines at 0.073, 0.078, 0.4, 0.44, 0.511, and 0.545 MeV are 0.3, 0.5, 0.6, 0.5, 0.5, and 0.1. These limits are based on observations that spanned approximately 1 week or more. Our results do not corroborate previous detections, most of which have been at the approximately 3 sigma level. We cannot exclude, however, the possibility of transient features with our current analysis. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7650,WASHINGTON,DC 20375. UNIV SPACE RES ASSOC,WASHINGTON,DC. RP ULMER, MP (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Johnson, Neil/G-3309-2014 NR 50 TC 38 Z9 38 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1994 VL 432 IS 1 BP 228 EP 238 DI 10.1086/174564 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PD611 UT WOS:A1994PD61100023 ER PT J AU DASGUPTA, A WHITNEY, KG AF DASGUPTA, A WHITNEY, KG TI Z-SCALED DATA FOR DIELECTRONIC RECOMBINATION FROM O-LIKE TO F-LIKE IONS SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID ISOELECTRONIC SEQUENCE; SATELLITE SPECTRA; FLUORINELIKE IONS; RATE COEFFICIENTS; SELENIUM; LINES AB Dielectronic-recombination (DR) data such as singly and doubly excited-state energies, autoionization rates to ground and excited states, radiative decay rates to singly excited states, and DR branching ratios are presented for recombination from oxygen-like to fluorine-like Ar, Ti, Fe, and Se ions. These data have been obtained using a detailed Hartree-Fock calculation with relativistic corrections. Three- and four-parameter fits to these data were then made to obtain scaling relations for the above mentioned quantities. Using these scaling relations one can thus interpolate the DR data for any ion with atomic number 18 less-than-or-equal-to Z less-than-or-equal-to 34. By extrapolation, one should also be able to calculate the DR data to atomic numbers in some range beyond Z = 34. (C) 1994 Academic Press, Inc. RP DASGUPTA, A (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 18 TC 15 Z9 15 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD SEP PY 1994 VL 58 IS 1 BP 77 EP 99 DI 10.1006/adnd.1994.1024 PG 23 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA PB823 UT WOS:A1994PB82300003 ER PT J AU TAKLA, NK KOFFMAN, R BAILEY, DA AF TAKLA, NK KOFFMAN, R BAILEY, DA TI COMBAT STRESS, COMBAT FATIGUE, AND PSYCHIATRIC DISABILITY IN AIRCREW SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Review ID STATES-AIR-FORCE AB A survey of the literature reveals little delta regarding modern aviation and combat-related stress, fatigue, or psychiatric disabilities. What little is known about combat fatigue in aircrew is largely inferred from literature written about ground personnel. Understanding the unique aviation environment is necessary in order to develop effective combat fatigue prevention programs. This paper reviews and summarizes the literature regarding aeromedical aspects of combat stress reactions. Combat stress, fatigue, and psychiatric disabilities are common battlefield conditions, but are largely preventable. If not prevented or treated appropriately, combat stress reactions will frequently lead to more serious psychiatric disabilities, causing the evacuation of the combatant away from his or her unit with no expectation of return to duty. Appropriate intervention using the basic principles of proximity, immediacy, and expectancy are crucial in reducing these casualties and returning aviation personnel to combat duty. RP TAKLA, NK (reprint author), USN,AEROSPACE & OPERAT MED INST,DEPT PSYCHIAT,220 HOVEY RD,PENSACOLA,FL 32508, USA. NR 24 TC 5 Z9 5 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD SEP PY 1994 VL 65 IS 9 BP 858 EP 865 PG 8 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA PF322 UT WOS:A1994PF32200010 PM 7818457 ER PT J AU TARPLEY, RJ RIDGWAY, SH AF TARPLEY, RJ RIDGWAY, SH TI CORPUS-CALLOSUM SIZE IN DELPHINID CETACEANS SO BRAIN BEHAVIOR AND EVOLUTION LA English DT Article DE CETACEA; ODONTOCETI; DELPHINIDAE; CORPUS CALLOSUM; BRAIN SIZE; ALLOMETRY ID MORPHOMETRIC ANALYSIS; SEXUAL DIMORPHISM; VISUAL-CORTEX; AGE; DOMINANCE; SYNAPSES; DENSITY; DOLPHIN; NEURONS; LARGER AB The midsagittal surface area of the corpus callosum was determined by computer-assisted morphometry in juvenile and adult members of 13 species of the cetacean family Delphinidae. In 57 brains, absolute callosal areas ranged from 104 to 829 mm(2). When compared to other mammal groups possessing a corpus callosum, callosal area in dolphins was smaller in relation to brain mass with a ratio range (mm(2)/g) of 0.08-0.31. The corpus callosum was decreased relative to brain mass in the larger-brained odontocetes, suggesting that increases in brain size were not necessarily allied with needs for equivalent increases in callosal linkage. One delphinid species, Tursiops truncatus, for which the largest single-species sample was available, was examined for sex differences in callosal size relative to brain mass. Among 10 males and 5 females the averaged ratio was not distinguishable between sexes. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. NR 55 TC 44 Z9 45 U1 0 U2 8 PU KARGER PI BASEL PA ALLSCHWILERSTRASSE 10, CH-4009 BASEL, SWITZERLAND SN 0006-8977 J9 BRAIN BEHAV EVOLUT JI Brain Behav. Evol. PD SEP PY 1994 VL 44 IS 3 BP 156 EP 165 DI 10.1159/000113587 PG 10 WC Behavioral Sciences; Neurosciences; Zoology SC Behavioral Sciences; Neurosciences & Neurology; Zoology GA PE410 UT WOS:A1994PE41000004 PM 7987664 ER PT J AU COLTON, MC POE, GA AF COLTON, MC POE, GA TI SHARED PROCESSING PROGRAM, DEFENSE METEOROLOGICAL SATELLITE PROGRAM, SPECIAL SENSOR MICROWAVE IMAGER ALGORITHM SYMPOSIUM, 8-10 JUNE 1993 SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Editorial Material AB The Shared Processing Program established the Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave/Imager (SSM/I) Algorithm Research Panel in August 1992 in order to satisfy the requirements of operational users through controlled evolution of the SSM/I ground processing software, particularly the geophysical retrieval algorithms. The first DMSP SSM/I Algorithm Symposium was hosted by Fleet Numerical Meteorology and Oceanography Center at the Naval Postgraduate School, Monterey, California, from 8 to 10 June 1993. The purpose of the symposium was to provide an open forum in which SSM/I algorithm developers could present new algorithms to be considered as updates to the SSM/I ground processing software. There were approximately 80 attendees, representing five countries, and the proceedings have been compiled as a preprint volume. The agenda of 28 presentations addressed all of the land, ocean, and air parameters that the SSM/I measures. Open discussion periods ensured a large measure of audience participation and multidisciplinary information exchange. The Algorithm Research Panel has met twice since the symposium to evaluate the results of the symposium and to devise an implementation strategy for near-term (six month) updates to some of the geophysical retrievals, notably the surface wind speed, rain rate, snow extent, and ice concentration algorithms. C1 USN,RES LAB,PASS MICROWAVE SECT,WASHINGTON,DC 20375. RP COLTON, MC (reprint author), FNMOC,CODE 73,7 GRACE HOPPE RD,STOP 1,MONTEREY,CA 93943, USA. NR 2 TC 16 Z9 16 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD SEP PY 1994 VL 75 IS 9 BP 1663 EP 1669 PG 7 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PJ538 UT WOS:A1994PJ53800006 ER PT J AU MCGILL, RA ABRAHAM, MH GRATE, JW AF MCGILL, RA ABRAHAM, MH GRATE, JW TI CHOOSING POLYMER-COATINGS FOR CHEMICAL SENSORS SO CHEMTECH LA English DT Article ID RESPONSES C1 UCL, LONDON, ENGLAND. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP MCGILL, RA (reprint author), GEOCENTERS INC, USN, RES LAB, CODE 6170, WASHINGTON, DC 20375 USA. NR 23 TC 175 Z9 185 U1 2 U2 27 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0009-2703 J9 CHEMTECH JI Chemtech PD SEP PY 1994 VL 24 IS 9 BP 27 EP 37 PG 11 WC Chemistry, Applied SC Chemistry GA PH212 UT WOS:A1994PH21200009 ER PT J AU DUVAL, NJ LAHREN, KM ONEIL, KM AF DUVAL, NJ LAHREN, KM ONEIL, KM TI EFFECT OF INFLUENZA VACCINE ON BRONCHOPROVOCATION TESTING IN NORMAL SUBJECTS SO CHEST LA English DT Article ID ASTHMATIC-PATIENTS; REACTIVITY; INFECTION; CHALLENGE; VIRUS AB A study of 55 nonasthmatic patients was undertaken to determine if recent influenza vaccination is a justifiable exclusionary criteria for bronchoprovocation testing. Healthy subjects without history of asthma and with negative methacholine challenge tests were given an intramuscular injection of killed influenza vaccine. Methacholine challenge testing was repeated 24 h later. While a statistically significant decline in FEV(1) at 188 methacholine dose units was demonstrated (p<0.018), this was not clinically significant; none of the 55 subjects converted a negative test to positive. We conclude that recent influenza vaccination is not a sufficient exclusionary criterion for methacholine challenge testing. Positive results in a patient recently vaccinated would still indicate asthma in the correct clinical setting. C1 USN,MED CTR,DIV PULM MED,PORTSMOUTH,VA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU AMER COLL CHEST PHYSICIANS PI NORTHBROOK PA 3300 DUNDEE ROAD, NORTHBROOK, IL 60062-2348 SN 0012-3692 J9 CHEST JI Chest PD SEP PY 1994 VL 106 IS 3 BP 750 EP 752 DI 10.1378/chest.106.3.750 PG 3 WC Critical Care Medicine; Respiratory System SC General & Internal Medicine; Respiratory System GA PG605 UT WOS:A1994PG60500027 PM 8082353 ER PT J AU WALDRON, A AF WALDRON, A TI CHINESE MILITARY THEORY - ANCIENT AND MODERN - TIEN,CY SO CHINA QUARTERLY LA English DT Book Review C1 BROWN UNIV, PROVIDENCE, RI 02912 USA. RP WALDRON, A (reprint author), USN, WAR COLL, NEWPORT, RI USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0305-7410 J9 CHINA QUART JI China Q. PD SEP PY 1994 IS 139 BP 837 EP 838 PG 2 WC Area Studies SC Area Studies GA PU503 UT WOS:A1994PU50300046 ER PT J AU OWENS, MT AF OWENS, MT TI THE JOINT STAFF SO COMMENTARY LA English DT Letter C1 STRATEG REVIEW,NEWPORT,RI. RP OWENS, MT (reprint author), USN,COLL WAR,NEWPORT,RI 02840, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER JEWISH COMMITTEE PI NEW YORK PA 165 E 56TH ST, NEW YORK, NY 10022 SN 0010-2601 J9 COMMENTARY JI Commentary PD SEP PY 1994 VL 98 IS 3 BP 13 EP 14 PG 2 WC Political Science; Social Issues SC Government & Law; Social Issues GA PC934 UT WOS:A1994PC93400019 ER PT J AU LEWIS, T AF LEWIS, T TI MAKING THE CONNECTION SO COMPUTER LA English DT Editorial Material RP LEWIS, T (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD SEP PY 1994 VL 27 IS 9 BP 6 EP 6 PG 1 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA PF958 UT WOS:A1994PF95800002 ER PT J AU VOIGT, R AF VOIGT, R TI EVOLVING BUSES - BACKPLANE BUSES MATURE TO KEEP PACE WITH TECHNOLOGY SO COMPUTER LA English DT Note RP VOIGT, R (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD SEP PY 1994 VL 27 IS 9 BP 94 EP 95 DI 10.1109/2.312051 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA PF958 UT WOS:A1994PF95800017 ER PT J AU FRENCH, DA GARCIA, SMF AF FRENCH, DA GARCIA, SMF TI FINITE-ELEMENT APPROXIMATION OF AN EVOLUTION PROBLEM MODELING SHEAR-BAND FORMATION SO COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING LA English DT Article AB An error analysis is provided for the spatial approximation by the finite element method of a nonlinear time-dependent problem which models the antiplane shear deformations of a thermoplastic material. This problem consists of a system of two coupled partial differential equations with velocity and temperature unknowns. Optimal order error estimates in the L2 norm are given for each of these. C1 USN ACAD, DEPT MATH, ANNAPOLIS, MD 21402 USA. RP UNIV CINCINNATI, DEPT MATH SCI ML25, CINCINNATI, OH 45221 USA. NR 11 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0045-7825 EI 1879-2138 J9 COMPUT METHOD APPL M JI Comput. Meth. Appl. Mech. Eng. PD SEP PY 1994 VL 118 IS 1-2 BP 153 EP 161 DI 10.1016/0045-7825(94)00021-2 PG 9 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications; Mechanics SC Engineering; Mathematics; Mechanics GA PG428 UT WOS:A1994PG42800008 ER PT J AU HAMMING, RW AF HAMMING, RW TI SCIENCE IS IN THE EYE OF THE BEHOLDER SO COMPUTERS & CHEMISTRY LA English DT Article; Proceedings Paper CT 3rd International Workshop on Open Problems in Computational Molecular Biology CY JUL 11-25, 1993 CL TELLURIDE, CO AB The way you view science limits the things that you can do ''scientifically''. Fortunately ''science'' is not a single thing but an evolving concept of how to cope with the world, and this flexible attitude towards science can be useful. The rigid view gives strict guidance on how to proceed ''scientifically'', while the more flexible approach allows for a greater range of response on your part. This paper gives some of the various views of what science is, in the hope that it will liberate you from being too strict without at the same time losing the useful guidance that ''science'' often provides. RP HAMMING, RW (reprint author), US POSTGRAD NAVAL COLL,DEPT COMP SCI,CS HG,MONTEREY,CA 93940, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0097-8485 J9 COMPUT CHEM JI Comput. Chem. PD SEP PY 1994 VL 18 IS 3 BP 353 EP 357 DI 10.1016/0097-8485(94)85029-1 PG 5 WC Chemistry, Multidisciplinary; Computer Science, Interdisciplinary Applications SC Chemistry; Computer Science GA PJ458 UT WOS:A1994PJ45800017 PM 16649268 ER PT J AU RAMESH, B SENGUPTA, K AF RAMESH, B SENGUPTA, K TI MANAGING COGNITIVE AND MIXED-MOTIVE CONFLICTS IN CONCURRENT ENGINEERING SO CONCURRENT ENGINEERING-RESEARCH AND APPLICATIONS LA English DT Article DE COGNITIVE CONFLICT; MIXED-MOTIVE CONFLICT; COGNITIVE FEEDBACK; DESIGN RATIONALE ID GROUP DECISION-MAKING; INFORMATION-SYSTEMS; KNOWLEDGE; FEEDBACK; WORK AB In collaborative activities such as concurrent engineering (GE), conflicts arise due to differences in goals, information available, and the understanding of the task. Such conflicts can be categorized into two types: mixed-motive and cognitive. Mixed-motive conflicts are essentially due to interest differentials among stakeholders. Cognitive conflicts can occur even when the stakeholders do not differ in their respective utilities, but simply because they offer multiple cognitive perspectives on the problem. Because conflicts in CE occur under a wider context of cooperative problem solving, the imperative for solving conflicts in such situations is strong. This paper argues that mechanisms for managing conflicts in CE should bear a strong conceptual mapping with the nature of the underlying conflict. Moreover, since CE activities are performed in collaborative settings, such mechanisms should accommodate information processing at multiple referent levels. We discuss the nature of both types of conflicts and the requirements of mechanisms for managing them, The functionalities of an implementation that addresses these requirements are illustrated through an example of a CE task RP RAMESH, B (reprint author), USN,POSTGRAD SCH,DEPT SYST MANAGEMENT,MONTEREY,CA 93943, USA. RI Ramesh, Balasubramaniam/C-2565-2008 NR 59 TC 6 Z9 6 U1 0 U2 0 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 1063-293X J9 CONCURRENT ENG-RES A JI Concurrent Eng.-Res. Appl. PD SEP PY 1994 VL 2 IS 3 BP 223 EP 236 DI 10.1177/1063293X9400200308 PG 14 WC Computer Science, Interdisciplinary Applications; Engineering, Manufacturing; Operations Research & Management Science SC Computer Science; Engineering; Operations Research & Management Science GA PW379 UT WOS:A1994PW37900008 ER PT J AU JOHNSTONE, PAS SINDELAR, WF KINSELLA, TJ AF JOHNSTONE, PAS SINDELAR, WF KINSELLA, TJ TI EXPERIMENTAL AND CLINICAL-STUDIES OF INTRAOPERATIVE RADIATION-THERAPY SO CURRENT PROBLEMS IN CANCER LA English DT Article ID EXTERNAL BEAM IRRADIATION; INTRA-OPERATIVE RADIOTHERAPY; NATIONAL-CANCER-INSTITUTE; SOFT-TISSUE SARCOMAS; PERIPHERAL-NERVE; RETROPERITONEAL; TOLERANCE; CARCINOMA; PANCREAS; IORT AB Intraoperative radiation therapy (IORT) is an innovative treatment modality that has recently been given considerable attention as an approach toward controlling various locally advanced cancers. IORT involves surgical extirpation or debulking of the malignant lesion and the delivery of a large single dose of radiation to the tumor bed or to residual disease. This strategy allows for a theoretical enhancement of the therapeutic effect of radiation for three reasons: (1) the biologic effectiveness of a single large radiation dose is higher than for the same dose given in a fractionated regimen; (2) the dose of radiation is precisely given to the area at greatest risk of tumor recurrence (or persistence); and (3) irradiation of dose-limiting normal tissues may be avoided by operative mobilization of the tissues from the treatment volume by customized lead shielding of anatomically fixed structures or by judicious choice of electron beam energies or use of a bolus to limit dose to deep structures. Electrons are generally used for IORT because of sharp dose falloff. This avoids potential toxic effects to normal structures that may lie deep to the treatment volume. Conventional external beam photon radiation therapy (EBRT) allows less accurate tumor volume delineation (even with sophisticated treatment planning technique) and dose limitations necessitated by normal tissues incidentally in the treatment volume. A considerable amount of experimental and clinical data are available on the acute and late effects of IORT on normal tissues. Dose tolerances of many organs have been described in large animal models, and clinical toxicities are evident in several trials. Clinical IORT treatments are provided in more than 250 U.S. and foreign centers at the present time. Given the current interest in IORT, this monograph will review IORT methods and experimental and clinical results with emphasis on its present and future role for locally advanced cancers. C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NCI,BETHESDA,MD 20892. UNIV WISCONSIN,DEPT HUMAN ONCOL,MADISON,WI 53706. RP JOHNSTONE, PAS (reprint author), USN,MED CTR,DIV RADIAT ONCOL,SAN DIEGO,CA 92132, USA. NR 90 TC 0 Z9 0 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0147-0272 J9 CURR PROB CANCER JI Curr. Probl. Cancer PD SEP-OCT PY 1994 VL 18 IS 5 BP 253 EP 289 PG 37 WC Oncology SC Oncology GA PY654 UT WOS:A1994PY65400001 ER PT J AU QUINT, T QUINTAS, L AF QUINT, T QUINTAS, L TI THE SHAPLEY VALUE OF RESALE-PROOF TRADES SO ECONOMICS LETTERS LA English DT Article AB This paper studies the Shapley value, PSI, of transferable utility games associated with resale-proof trades of information. PSI is in the core iff there is exactly one minimal resale-proof set. A simple expression for PSI is obtained for 'symmetric' games; and some bounds are given for psi in non-symmetric cases. C1 UNIV NACL SAN LUIS,INST APPL MATH,EJERCITO ANDES 950,RA-5700 SAN LUIS,ARGENTINA. UNIV AUTONOMA BARCELONA,DEPT ECON & HIST ECON,E-08193 BARCELONA,SPAIN. USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. UNIV NACL SAN LUIS,DEPT MATH,RA-5700 SAN LUIS,ARGENTINA. NR 16 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0165-1765 J9 ECON LETT JI Econ. Lett. PD SEP PY 1994 VL 46 IS 1 BP 11 EP 21 DI 10.1016/0165-1765(94)90071-X PG 11 WC Economics SC Business & Economics GA PG955 UT WOS:A1994PG95500003 ER PT J AU FINSTUEN, K NICHOLS, S HOFFMAN, P AF FINSTUEN, K NICHOLS, S HOFFMAN, P TI CORRECTION TO A CORRECTION FACTOR AND IDENTIFICATION OF HYPOTHESES FOR ONE-WAY ANOVA FROM SUMMARY STATISTICS SO EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT LA English DT Article AB Computation of a one-way analysis of variance (ANOVA) F ratio from descriptive statistics in the absence of raw data is corrected from two sources. Means associated with inferential statistical hypotheses are identified as estimable population parameters. C1 USN,WASHINGTON,DC 20350. RP FINSTUEN, K (reprint author), USA,MED DEPT CTR & SCH,BAYLOR UNIV GRAD PROGRAM HLTH CARE ADM,DIV HLTH,FT SAM HOUSTON,TX 78234, USA. NR 3 TC 0 Z9 0 U1 1 U2 3 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0013-1644 J9 EDUC PSYCHOL MEAS JI Educ. Psychol. Meas. PD FAL PY 1994 VL 54 IS 3 BP 606 EP 607 DI 10.1177/0013164494054003003 PG 2 WC Psychology, Educational; Mathematics, Interdisciplinary Applications; Psychology, Mathematical SC Psychology; Mathematics GA PC981 UT WOS:A1994PC98100003 ER PT J AU HARVEY, DP TERRELL, JB SUDARSHAN, TS AF HARVEY, DP TERRELL, JB SUDARSHAN, TS TI HYDROGEN AND TEMPERATURE EFFECTS ON THE SLOW BEND BEHAVIOR OF 21-6-9 STAINLESS-STEEL SO ENGINEERING FRACTURE MECHANICS LA English DT Note AB Three-point bend test studies on 21-6-9 austenitic stainless steel at 293 K and 77 K demonstrated that hydrogen charging promoted the formation of facets at 293 K, increased the size of facets at 77 K and reduced the energy absorbed by the material at both temperatures. These observations suggest that some stainless steels can exhibit changes in their ductile to brittle transition behavior in the presence of hydrogen. Further, the observation that embrittlement exists even at liquid nitrogen temperatures indicates that little or no localized rearrangement of hydrogen during the test is required or that relatively high strain rate effects on hydrogen embrittlement need not be necessarily attributed to enhanced transport of hydrogen atmospheres by mobile dislocations. The data presented in this paper are consistent with a model that predicts the lowering of interfacial strengths in the presence of an environment. C1 REYNOLDS MET CO,RICHMOND,VA 23221. MAT MODIFICAT INC,FAIRFAX,VA 22031. RP HARVEY, DP (reprint author), USN,RES LAB,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD SEP PY 1994 VL 49 IS 1 BP 159 EP 163 DI 10.1016/0013-7944(94)90120-1 PG 5 WC Mechanics SC Mechanics GA PW232 UT WOS:A1994PW23200016 ER PT J AU SMILLIE, RJ AF SMILLIE, RJ TI SET PHASERS ON STUN - AND OTHER TRUE TALES OF DESIGN, TECHNOLOGY, AND HUMAN ERROR - CASEY,S SO ERGONOMICS LA English DT Book Review RP SMILLIE, RJ (reprint author), USN,DEF MODELLING & SIMULAT OFF,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0014-0139 J9 ERGONOMICS JI Ergonomics PD SEP PY 1994 VL 37 IS 9 BP 1587 EP 1587 DI 10.1080/00140139408964936 PG 1 WC Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Engineering; Psychology GA PJ782 UT WOS:A1994PJ78200012 ER PT J AU ANDERSON, GL ROBERTSON, RC PETERSON, BL DILLARD, DA AF ANDERSON, GL ROBERTSON, RC PETERSON, BL DILLARD, DA TI EMBEDDED PIEZOELECTRIC SENSORS TO MEASURE PEEL STRESSES IN ADHESIVE JOINTS SO EXPERIMENTAL MECHANICS LA English DT Article ID FLUORIDE) AB Although peel stresses are believed to be responsible for failure in many adhesive joint geometries, the measurement of these peel stresses has been elusive. In this work, embedded poly(vinylidene fluoride) piezoelectric sensors were used to measure peel stresses in adhesively bonded joints. Piezoelectric KYNAR(R) film was etched to produce multi-area stress sensors which were bonded into adhesive joints. Calibration results and results for single-lap and elastomeric butt joints are presented. The elastomeric butt joint was compared to an analytical solution for the bond-normal stresses, and the single-lap joint results were compared to finite-element analysis. Promising features and limitations of this technique are discussed. C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. VIRGINIA POLYTECH INST & STATE UNIV,DEPT ENGN SCI & MECH,BLACKSBURG,VA 24061. RP ANDERSON, GL (reprint author), THIOKOL CORP,M-S 243,POB 707,BRIGHAM CITY,UT 84302, USA. RI Dillard, David/C-3185-2012 OI Dillard, David/0000-0002-2903-9318 NR 23 TC 4 Z9 4 U1 0 U2 1 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 0014-4851 J9 EXP MECH JI Exp. Mech. PD SEP PY 1994 VL 34 IS 3 BP 194 EP 201 DI 10.1007/BF02319755 PG 8 WC Materials Science, Multidisciplinary; Mechanics; Materials Science, Characterization & Testing SC Materials Science; Mechanics GA PJ166 UT WOS:A1994PJ16600002 ER PT J AU MUSHRUSH, GW BEAL, EJ HARDY, DR HAZLETT, RN MOSE, DG AF MUSHRUSH, GW BEAL, EJ HARDY, DR HAZLETT, RN MOSE, DG TI LIQUID-PHASE OXIDATION OF ORGANOSULFUR COMPOUNDS BY TERT-BUTYL HYDROPEROXIDE AND FUEL INSTABILITY REACTIONS SO FUEL LA English DT Article; Proceedings Paper CT 1992 Eastern Oil Shale Symposium (EOSS) CY 1992 CL UNIV KENTUCKY, LEXINGTON, KY SP UNIV KENTUCKY, CTR APPL ENERGY RES, UNIV KENTUCKY, INST MIN & MINERALS RES HO UNIV KENTUCKY DE FUELS; ORGANOSULFUR COMPOUNDS; INSTABILITY ID SEDIMENT FORMATION; DIESEL FUEL; STABILITY; SHALE; MODEL; OIL AB Polar heteroatomic species have been correlated with storage instability problems in both petroleum and shale derived middle distillate fuels. Instability is defined as the formation of filterable sediments and fuel insoluble gums. Heteroatoms (oxygen, nitrogen and sulfur) have been found to be greatly enhanced in such sediments. Trace levels of certain organo-sulfur compounds, especially sulfonic acids, have been found to significantly alter the deposit formation process, Hydroperoxides have also been implicated in the instability process which would point to free radical mechanisms. The effectiveness of organic amines as additives suggests that acid-base chemistry is also involved in the formation of deposits. This paper reports on a study of organo-sulfur, nitrogen and hydroperoxide compounds employed as dopants in fuels. The most detrimental dopant species were sulfonic acids. C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. HUGHES ASSOCIATES,COLUMBIA,MD 21045. RP MUSHRUSH, GW (reprint author), USN,RES LAB,NAVY TECHNOL CTR SAFETY & SURVIVABIL,CODE 6180,WASHINGTON,DC 20375, USA. NR 24 TC 8 Z9 8 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD SEP PY 1994 VL 73 IS 9 BP 1481 EP 1485 DI 10.1016/0016-2361(94)90067-1 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA PC423 UT WOS:A1994PC42300016 ER PT J AU KIRSCHENBAUM, SS ARRUDA, JE AF KIRSCHENBAUM, SS ARRUDA, JE TI EFFECTS OF GRAPHIC AND VERBAL PROBABILITY INFORMATION ON COMMAND DECISION-MAKING SO HUMAN FACTORS LA English DT Article ID PERFORMANCE; DISPLAYS AB The performance effects of graphic and verbal representations of uncertainty were investigated within the context of a spatial problem.. Sixteen experienced naval submarine officers acted as decision makers (i.e., submarine commanders) in eight simulated scenarios. Four scenario problems were presented with either a verbal or a graphic representation of uncertainty. The degree of uncertainty was controlled by manipulating oceanic conditions and information modeling. The graphic representation of uncertainty resulted in superior range estimates only when the oceanic noise was high and the environmental information was properly modeled. No reliable differences in confidence were observed. These results suggest that for spatial problems, a graphic/spatial representation of uncertainty may considerably improve the judgments of decision makers. C1 UNIV RHODE ISL,KINGSTON,RI 02881. RP KIRSCHENBAUM, SS (reprint author), USN,DIV UNDERSEA WARFARE CTR,DEPT COMBAT SYST,CODE 2212,BLDG 1171-1,NEWPORT,RI 02841, USA. NR 21 TC 14 Z9 14 U1 0 U2 2 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD SEP PY 1994 VL 36 IS 3 BP 406 EP 418 PG 13 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA PL892 UT WOS:A1994PL89200002 ER PT J AU STROBEL, DF ZHU, X SUMMERS, ME AF STROBEL, DF ZHU, X SUMMERS, ME TI ON THE VERTICAL THERMAL STRUCTURE OF IOS ATMOSPHERE SO ICARUS LA English DT Article ID SO2 ATMOSPHERE; PLASMA TORUS; BAND MODELS; MESOSPHERE; METEOROLOGY; STABILITY; ESCAPE AB A radiative-thermal conduction model for the vertical thermal structure of Io's atmosphere is developed with solar heating by SO2 absorption in UV and near-IR bands and non-LTE cooling by SO2 nu1, nu2, nu3, vibrational bands and rotational lines. The model predicts the existence of a mesopause in Io's atmosphere when the surface pressure exceeds approximately 10 nbar. The radiative time constant for establishing a mesosphere/mesopause on Io is only approximately 20 min, whereas the thermospheric radiative time constant is about 1 hr. These time constants are significantly shorter than the diurnal time scale and competitive with dynamical time scales. In the thermosphere when solar UV heating dominates, the asymptotic thermospheric temperature is approximately 270 K, only 140 K greater than the surface temperature because at high altitudes non-LTE cooling by SO2 rotation lines exceeds cooling in the nu2 vibrational band. Solar-heating-only models are incapable of generating warm enough atmospheres to satisfy the observational inferences from UV and especially millimeter-wave measurements. Joule heating driven by the penetration of Jupiter's corotational electric field into Io's conducting ionosphere is demonstrated to be the dominant heating mechanism in the subnanobar regions of Io's atmosphere with temperatures ranging from 150 to 1000 K as a function of decreasing pressure from 1 to 0.1 nbar. The asymptotic thermospheric temperature can attain a value as high as 1800 K. (C) 1994 Academic Press, Inc. C1 JOHNS HOPKINS UNIV,DEPT EARTH & PLANETARY SCI,BALTIMORE,MD 21218. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP STROBEL, DF (reprint author), OBSERV PARIS,DESPA,F-92195 MEUDON,FRANCE. RI Zhu, Xun/C-2097-2016 OI Zhu, Xun/0000-0001-7860-6430 NR 36 TC 51 Z9 51 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0019-1035 J9 ICARUS JI Icarus PD SEP PY 1994 VL 111 IS 1 BP 18 EP 30 DI 10.1006/icar.1994.1130 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PP107 UT WOS:A1994PP10700003 ER PT J AU SCHEPS, R MYERS, JF MIZELL, G YATES, K AF SCHEPS, R MYERS, JF MIZELL, G YATES, K TI INTERNALLY FOLDED ND-YAG AND ND-YVO4 LASERS PUMPED BY LASER-DIODES SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID EFFICIENT AB An efficient, scalable, diode-pumped Nd laser design is reported. The gain element can be longitudinally pumped along five separate axes and is relatively simple to fabricate. Both Nd:YAG and Nd:YVO4 gain media were evaluated. Using five single-stripe laser diodes to pump the Nd:YAG, 3.94 W of absorbed power produced 2.1 W CW at 1.06 mum. The slope efficiency was 54 percent and the output was TEM00. The threshold power was 40 mW. No evidence of thermal saturation was observed up to the maximum pump power. Repetitively Q-switched operation is also reported. The maximum output power for Nd:YVO4 obtained with 2.9 W of pump power was 1.3 W. The slope efficiency was 47 percent. C1 VIRGO OPT,PORT RICHEY,FL 34668. RP SCHEPS, R (reprint author), USN COMMAND,DIV ROTSE,CTR OCEAN SURVEILLANCE,CODE 754,SAN DIEGO,CA 92152, USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD SEP PY 1994 VL 30 IS 9 BP 2132 EP 2135 DI 10.1109/3.309874 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA PE800 UT WOS:A1994PE80000020 ER PT J AU SEARLES, SK TUCKER, JE WEXLER, BL MASTERS, MF AF SEARLES, SK TUCKER, JE WEXLER, BL MASTERS, MF TI VUV EMISSION FROM DISCHARGE-PUMPED AR SUPERSONIC JETS UNDER HIGH-EXCITATION CONDITIONS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ARGON EXCIMER LASER; VACUUM ULTRAVIOLET; OPTICAL-PROPERTIES; CLUSTERS; SPECTROSCOPY; MOLECULES; EXPANSION; RADIATION; MIXTURES; PLASMAS AB The excimer laser potential of Ar supersonic jets excited by an intense pulsed discharge is studied. Excimer emission is recorded during and after the 100 ns discharge. The time-resolved emission is recorded as a function of plenum gas pressure and distance from the nozzle. A simple mechanism is proposed to account for the luminescence data. Model calculations are compared to the experimental data. C1 INDIANA UNIV PURDUE UNIV,DEPT PHYS,FT WAYNE,IN 46805. RP SEARLES, SK (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 30 TC 10 Z9 10 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD SEP PY 1994 VL 30 IS 9 BP 2141 EP 2146 DI 10.1109/3.309876 PG 6 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA PE800 UT WOS:A1994PE80000022 ER PT J AU PRONKO, MS AF PRONKO, MS TI CONTROLLING OUTPUT GAIN UNIFORMITY BY SPATIAL VARIATION OF THE X-RAY PREIONIZATION IN A LARGE-APERTURE DISCHARGE-PUMPED KRF AMPLIFIER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID GAS-HALIDE LASERS; XECL LASER; AMPLIFICATION; COMPACT AB A technique for improving the output uniformity in fast-discharge large-aperture lasers is described. Spatial variation of the X-ray preionization flux is used to compensate for the discharge-plasma skin depth and nonuniformity in the initial electric-field distribution. The technique was demonstrated using a 4.25 x 4.25 cm clear-aperture KrF laser that produces 2.7 J in a 15 ns FWHM pulse. RP PRONKO, MS (reprint author), USN,RES LAB,DIV PLASMA PHYS,LASER PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 31 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD SEP PY 1994 VL 30 IS 9 BP 2147 EP 2156 DI 10.1109/3.309877 PG 10 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA PE800 UT WOS:A1994PE80000023 ER PT J AU GOLDBERG, L MEHUYS, D WELCH, D AF GOLDBERG, L MEHUYS, D WELCH, D TI HIGH-POWER MODE-LOCKED COMPOUND LASER USING A TAPERED SEMICONDUCTOR AMPLIFIER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID PULSE GENERATION; DIODE-ARRAY; CW AB A new type of a high power mode-locked laser, based on a tapered stripe traveling wave semiconductor amplifier and an additional separate narrow stripe gain element is described. Active mode-locking, achieved by RF modulation of the narrow stripe, resulted in pulses as short as 12 ps. Separately, maximum peak powers of 16 W and pulse energies above 0.5 nJ were observed. C1 SDL INC,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 31 Z9 32 U1 1 U2 6 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD SEP PY 1994 VL 6 IS 9 BP 1070 EP 1072 DI 10.1109/68.324671 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA PK226 UT WOS:A1994PK22600006 ER PT J AU GONG, JA VOLAKIS, JL WOO, AC WANG, HTG AF GONG, JA VOLAKIS, JL WOO, AC WANG, HTG TI A HYBRID FINITE-ELEMENT BOUNDARY INTEGRAL METHOD FOR THE ANALYSIS OF CAVITY-BACKED ANTENNAS OF ARBITRARY SHAPE SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID MICROSTRIP ANTENNAS; SCATTERING; COMPUTATION AB An edge-based hybrid finite element-boundary integral (FE-BI) formulation using tetrahedral elements is described for scattering and radiation analysis of arbitrarily shaped cavity-backed patch antennas. By virtue of the finite element method (FEM), the cavity irregularities, the dielectric super/substrate inhomogeneities, and the diverse excitation schemes inside the cavity may be readily modeled when tetrahedral elements are used to discretize the cavity. On the aperture, the volume mesh reduces to a triangular grid allowing the modeling of non-rectangular patches. Without special handling of the boundary integral system, this formulation is typically applicable to cavity-backed antenna systems with moderate aperture size. To retain an O(N) memory requirement, storage of the full matrix due to the boundary integral equation is avoided by resorting to a structured triangular aperture grid and taking advantage of the integral's convolutional property. If necessary, this is achieved by overlaying a structured triangular grid on the unstructured triangular grid and relating the edge field coefficients between the two grids via two narrow banded transformation matrices. The combined linear system of equations is solved via the biconjugate gradient (BiCG) method, and the FFT algorithm is incorporated to compute the matrix-vector product efficiently, with minimal storage requirements. C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. USN,CTR AIR WARFARE,CHINA LAKE,CA 93555. RP GONG, JA (reprint author), UNIV MICHIGAN,RADIAT LAB,ANN ARBOR,MI 48109, USA. NR 15 TC 31 Z9 31 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD SEP PY 1994 VL 42 IS 9 BP 1233 EP 1242 DI 10.1109/8.318644 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA PH084 UT WOS:A1994PH08400004 ER PT J AU JANASWAMY, R AF JANASWAMY, R TI A FAST FINITE-DIFFERENCE METHOD FOR PROPAGATION PREDICTIONS OVER IRREGULAR, INHOMOGENEOUS TERRAIN SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID BOUNDARY-CONDITIONS; INTEGRAL-EQUATION AB Propagation of electromagnetic waves over irregular, inhomogeneous terrain is solved by a finite difference scheme. The method is fast and requires considerably less memory than the integral equation methods. The method requires a storage space of order O(N) and, an execution time of order O(N2). Fields generated by a TE(z) line source are represented in an integral form in terms of the field over a flat, constant impedance plane (the incident field), and the field scattered by the terrain irregularities and inhomogeneities. Accurate expressions are provided for the incident field and the Green's function, whose evaluation is otherwise accomplished by the rather time-consuming Sommerfeld's integrals. Measured equation of invariance is used to terminate the computational domain. The sparse matrix generated by the method is inverted by the Ricatti transform. Numerical results are presented for the ground wave as well as for the sky wave. Comparison is made for known geometries to establish the validity and limitations of the method. RP JANASWAMY, R (reprint author), USN,POSTGRAD SCH,DEPT ELECT P COMP ENGN,MONTEREY,CA 93943, USA. NR 21 TC 6 Z9 6 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD SEP PY 1994 VL 42 IS 9 BP 1257 EP 1267 DI 10.1109/8.318647 PG 11 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA PH084 UT WOS:A1994PH08400007 ER PT J AU BREWER, JE FEDORAK, R BROWN, WD AF BREWER, JE FEDORAK, R BROWN, WD TI CONTRIBUTIONS FROM THE 8TH BIANNUAL NONVOLATILE MEMORY TECHNOLOGY REVIEW (NVMTR) - FOREWORD SO IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY PART A LA English DT Editorial Material C1 USN,CTR NAVAL AIR DEV,CTR NAVAL AIR WARFARE,DIV AIR CRAFT,WARMINSTER,PA 18974. UNIV ARKANSAS,DEPT ELECT ENGN,FAYETTEVILLE,AR 72701. RP BREWER, JE (reprint author), WESTINGHOUSE ELECT CORP,PITTSBURGH,PA 15222, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1070-9886 J9 IEEE T COMPON PACK A JI IEEE Trans Compon. Packag. Manuf. Technol. Part A PD SEP PY 1994 VL 17 IS 3 BP 366 EP 366 PG 1 WC Engineering, Manufacturing; Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA PF040 UT WOS:A1994PF04000009 ER PT J AU LEE, JS HOPPEL, KW MANGO, SA MILLER, AR AF LEE, JS HOPPEL, KW MANGO, SA MILLER, AR TI INTENSITY AND PHASE STATISTICS OF MULTILOOK POLARIMETRIC AND INTERFEROMETRIC SAR IMAGERY SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article; Proceedings Paper CT IEEE International Geoscience and Remote Sensing Symposium: Better Understanding of Earth Environment (IGARSS 93) CY AUG 18-22, 1993 CL TOKYO, JAPAN SP INST ELECT INFORMAT & COMMUN ENGINEERS JAPAN, URSI ID RADAR AB Polarimetric and interferometric SAR data are frequently multilook processed for speckle reduction and data compression. The statistical characteristics of multilook data are quite different from those of single-look data. In this paper, we investigate the statistics of their intensity and phase. Probability density function (PDF's) of the multilook phase difference, magnitude of complex product, and intensity and amplitude ratios between two components of the scattering matrix are derived, and expressed in closed forms. The PDF's depend on the complex correlation coefficient and the number of looks. Comparisons of these theoretically derived PDF's are made to measurements from NASA/JPL AIRSAR data. The results of this paper can be applied to feature classification using polarimetric SAR and to the estimation of decorrelation effects of the interferometric SAR. C1 GEORGE WASHINGTON UNIV,DEPT MATH,WASHINGTON,DC 20052. RP LEE, JS (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7230,WASHINGTON,DC 20375, USA. NR 19 TC 340 Z9 399 U1 2 U2 16 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD SEP PY 1994 VL 32 IS 5 BP 1017 EP 1028 DI 10.1109/36.312890 PG 12 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA PF415 UT WOS:A1994PF41500007 ER PT J AU TAIT, GB AF TAIT, GB TI MICROWAVE MIXERS EMPLOYING MULTIPLE BARRIER SEMICONDUCTOR HETEROSTRUCTURE DEVICES SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID ALLOY RAMP HETEROSTRUCTURES; DIODES AB Experimental data on mixer performance of unipolar semiconductor heterostructure diodes containing bulk alloy-ramp barriers are presented. Prototype Al(x)Ga1-xAs/GaAs heterostructures containing one, two, and four barriers are fabricated by MBE and tested in a single-ended mixer circuit at 10 GHz. The devices with two and four barriers, which exhibit improved performance over the single-barrier device, achieve conversion losses between 4 and 6 dB and noise temperature ratios between 1.5 and 2 at 300 K. Several significant advantages over contending Schottky diodes are also discussed. The results indicate that multiple-barrier devices are good candidates for use in microwave and millimeter-wave mixer circuits. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375. UNIV VIRGINIA,DEPT ELECT ENGN,CHARLOTTESVILLE,VA 22903. RP TAIT, GB (reprint author), US MIL ACAD,DEPT ELECT ENGN,W POINT,NY 10996, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1994 VL 42 IS 9 BP 1596 EP 1601 DI 10.1109/22.310551 PN 1 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA PE807 UT WOS:A1994PE80700002 ER PT J AU STREIT, RL LUGINBUHL, TE AF STREIT, RL LUGINBUHL, TE TI MAXIMUM-LIKELIHOOD TRAINING OF PROBABILISTIC NEURAL NETWORKS SO IEEE TRANSACTIONS ON NEURAL NETWORKS LA English DT Article AB A maximum likelihood method is presented for training probabilistic neural networks (PNN's) using a Gaussian kernal, or Parzen window. The proposed training algorithm enables general nonlinear discrimination and is a generalization of Fisher's method for linear discrimination. Important features of maximum likelihood training for PNN's are: 1) it economizes the well known Parzen window estimator while preserving feed-forward NN architecture, 2) it utilizes class pooling to generalize classes represented by small training sets, 3) it gives smooth discriminant boundaries that often are ''piece-wise flat'' for statistical robustness, 4) it is very fast computationally compared to back-propagation, and 5) it is numerically stable. The effectiveness of the proposed maximum likelihood training algorithm is assessed using nonparametric statistical methods to define tolerance intervals on PNN classification performance. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. NR 21 TC 127 Z9 131 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1045-9227 J9 IEEE T NEURAL NETWOR JI IEEE Trans. Neural Netw. PD SEP PY 1994 VL 5 IS 5 BP 764 EP 783 DI 10.1109/72.317728 PG 20 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PG378 UT WOS:A1994PG37800009 PM 18267850 ER PT J AU TASKER, SA BANEY, RN CARL, M AF TASKER, SA BANEY, RN CARL, M TI HAEMOPHILUS-INFLUENZAE CELLULITIS SO INFECTIOUS DISEASES IN CLINICAL PRACTICE LA English DT Letter C1 USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP TASKER, SA (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1056-9103 J9 INFECT DIS CLIN PRAC JI Infect. Dis. Clin. Pract. PD SEP-OCT PY 1994 VL 3 IS 5 BP 372 EP 372 DI 10.1097/00019048-199409000-00014 PG 1 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA PK602 UT WOS:A1994PK60200014 ER PT J AU EDWARDS, JE ROSENFELD, P THOMAS, MD THOMAS, PJ NEWELL, CE AF EDWARDS, JE ROSENFELD, P THOMAS, MD THOMAS, PJ NEWELL, CE TI DIVERSITY RESEARCH IN THE UNITED-STATES-NAVY - AN UPDATE SO INTERNATIONAL JOURNAL OF INTERCULTURAL RELATIONS LA English DT Article; Proceedings Paper CT Symposium on Diversity in the Navy, at the 101st Annual Convention of the American-Psychological-Association CY AUG, 1993 CL TORONTO, CANADA SP AMER PSYCHOL ASSOC ID NON-HISPANIC WHITE AB Researchers at the Navy Personnel Research and Development Center (NPRDC) have investigated issues related to gender, racial, and ethnic diversity for over two decades. Rosenfeld, M. D. Thomas, Edwards, P. J. Thomas, and E. D. Thomas (1991) provided a comprehensive review of NPRDC diversity research conducted between 1970 and 1990. This article examines NPRDC diversity research conducted during the past 5 years and identifies future research issues. The present review is divided into four major topic areas and a final section of conclusions and future directions. The first section describes the Navywide and unit-specific programs to assess equal opportunity climate and sexual harassment. The second section summarizes research pertaining to issues raised by women's changing roles and their increased participation in the Navy. In the third section, the findings of Navy discipline studies shed light on the issue of higher disciplinary rates among minority personnel. Research on Hispanics is reviewed in the fourth section. Finally, in the Discussion and Conclusions section, potential future research emphases are identified. RP ROSENFELD, P (reprint author), USN,PERSONNEL RES & DEV CTR,53335 RYNE RD,SAN DIEGO,CA 92152, USA. NR 49 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0147-1767 J9 INT J INTERCULT REL JI Int. J. Intercult. Relat. PD FAL PY 1994 VL 18 IS 4 BP 521 EP 538 DI 10.1016/0147-1767(94)90020-5 PG 18 WC Psychology, Social; Social Sciences, Interdisciplinary; Sociology SC Psychology; Social Sciences - Other Topics; Sociology GA PZ277 UT WOS:A1994PZ27700005 ER PT J AU TAO, RJ ROY, GD AF TAO, RJ ROY, GD TI ELECTRORHEOLOGICAL FLUIDS - PREFACE SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Editorial Material C1 OFF NAVAL RES,ARLINGTON,VA. RP TAO, RJ (reprint author), SO ILLINOIS UNIV,DEPT PHYS,CARBONDALE,IL 62901, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD SEP PY 1994 VL 8 IS 20-21 BP R3 EP R3 PG 1 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA PP059 UT WOS:A1994PP05900001 ER PT J AU SUBRAHMANYAM, MB AF SUBRAHMANYAM, MB TI FINITE-HORIZON H-INFINITY WITH PARAMETER VARIATIONS SO INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL LA English DT Article ID SYSTEMS AB In this paper we consider the finite horizon H-infinity performance robustness problem with parameter variations. Assuming a nominal model, an iterative procedure is given to synthesize a suboptimal H-infinity controller, which yields the required performance even under parameter variations. As a byproduct, an expression for the variation of performance due to parameter variations is given for this specific controller. An example which illustrates the methodology is worked out under parameter uncertainties. C1 USN,CTR AIR WARFARE,DIV AIRCARFT,WARMINSTER,PA 18974. NR 15 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1049-8923 J9 INT J ROBUST NONLIN JI Int. J. Robust Nonlinear Control PD SEP-OCT PY 1994 VL 4 IS 5 BP 631 EP 643 DI 10.1002/rnc.4590040502 PG 13 WC Automation & Control Systems; Engineering, Electrical & Electronic; Mathematics, Applied SC Automation & Control Systems; Engineering; Mathematics GA PH447 UT WOS:A1994PH44700001 ER PT J AU MCCASKILL, TB REID, WG BUISSON, JA WARREN, HE AF MCCASKILL, TB REID, WG BUISSON, JA WARREN, HE TI EFFECT OF BROADCAST AND PRECISE EPHEMERIDES ON ESTIMATES OF THE FREQUENCY STABILITY OF GPS NAVSTAR CLOCKS SO INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS LA English DT Article DE GPS; NAVSTAR CLOCKS; FREQUENCY STABILITY; BROADCAST AND PRECISE EPHEMERIDES; EPHEMERIS; PREDICTION UNCERTAINTY AB Frequency stability analysis of on-orbit Navstar clocks is performed by the Naval Research Laboratory using both the broadcast and the precise post-processed ephemerides. The phase offset between the Navstar clock and the reference clock is computed from pseudorange measurements obtained by dual-frequency GPS receivers at the five GPS monitor sites and at the U.S. Naval Observatory precise-time site. The broadcast ephemerides are generated at the GPS master control station by a Kalman filter using data collected from the five GPS monitor stations. The precise post-processed ephemerides are generated by the Defense Mapping Agency (DMA) using data collected from the GPS monitor sites and from five additional DMA monitor sites. In this paper the frequency stability is estimated for two Navstar caesium clocks-a Block I caesium clock (Navstar 9) and a Block II caesium clock (Navstar 23)-using both the broadcast and the precise ephemerides. A significant improvement in the estimate of the frequency stability of the Block II clocks has been achieved using the precise ephemeris. RP MCCASKILL, TB (reprint author), USN,RES LAB,NAVAL CTR SPACE TECHNOL,SPACE APPLICAT BRANCH,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0737-2884 J9 INT J SATELL COMMUN JI Int. J. Satell. Commun. PD SEP-OCT PY 1994 VL 12 IS 5 BP 435 EP 441 DI 10.1002/sat.4600120505 PG 7 WC Engineering, Aerospace; Telecommunications SC Engineering; Telecommunications GA PR209 UT WOS:A1994PR20900004 ER PT J AU KOSTOFF, RN AF KOSTOFF, RN TI RESEARCH IMPACT ASSESSMENT - PRINCIPLES AND APPLICATIONS TO PROPOSED, ONGOING, AND COMPLETED PROJECTS SO INVESTIGATIVE RADIOLOGY LA English DT Article RP KOSTOFF, RN (reprint author), OFF NAVAL RES, TECH ASSESSMENT, 800 N QUINCY ST, ARLINGTON, VA 22217 USA. NR 34 TC 3 Z9 3 U1 1 U2 3 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0020-9996 J9 INVEST RADIOL JI Invest. Radiol. PD SEP PY 1994 VL 29 IS 9 BP 864 EP 869 DI 10.1097/00004424-199409000-00013 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA PJ625 UT WOS:A1994PJ62500013 PM 7995709 ER PT J AU NG, KW AF NG, KW TI CONTROL VALVE NOISE SO ISA TRANSACTIONS LA English DT Article DE CONTROL VALVE NOISE; VALVE NOISE GENERATING MECHANISMS; AERODYNAMIC NOISE; HYDRODYNAMIC NOISE; TURBULENT MIXING; VALVE NOISE MEASUREMENTS; VALVE NOISE PREDICTION; VALVE NOISE REDUCTION; QUIET VALVE; ACTIVE NOISE CONTROL AB In this review paper, the acoustic aspects of control valves are discussed. Specifically, valve noise generation mechanisms, noise measurement, prediction and reduction techniques will be presented. This paper starts with government noise regulations and requirements, and acoustic terminology, then followed by valve noise generation mechanisms, noise measurement and prediction techniques, and it concludes with noise reduction methods and case studies. RP NG, KW (reprint author), USN,OFF NAVAL RES,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 0 TC 4 Z9 4 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0019-0578 J9 ISA T JI ISA Trans. PD SEP PY 1994 VL 33 IS 3 BP 275 EP 286 DI 10.1016/0019-0578(94)90098-1 PG 12 WC Automation & Control Systems; Engineering, Multidisciplinary; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA PH805 UT WOS:A1994PH80500009 ER PT J AU OWENS, AWA AF OWENS, AWA TI THE REVOLUTION IN MILITARY TECHNOLOGY SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Letter RP OWENS, AWA (reprint author), USN,JOINT CHIEFS STAFF,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD FAL PY 1994 VL 11 IS 1 BP 5 EP 5 PG 1 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA PL710 UT WOS:A1994PL71000001 ER PT J AU NGAI, KL WANG, YN MAGALAS, LB AF NGAI, KL WANG, YN MAGALAS, LB TI THEORETICAL BASIS AND GENERAL APPLICABILITY OF THE COUPLING MODEL TO RELAXATIONS IN COUPLED SYSTEMS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID NA BETA-ALUMINA; MOLECULAR-DYNAMICS; CONDENSED MATTER; GLASS-TRANSITION; DIELECTRIC LOSS; OXYGEN; CROSSOVER; TANTALUM; NIOBIUM AB The coupling model proposed more than a decade ago for the description of relaxations in complex correlated systems by one of us (KLN) have been shown repeatedly to be applicable to amorphous polymers, viscous liquids, the glassy state, metallic glasses, glassy ionic conductors and etc. In these examples, the relaxing species are dense packed and mutually interacting. As a consequence, the constraints between them have a strong influence on the relaxation dynamics. Very recent quasielastic neutron scattering experimental data as well as molecular dynamics simulation results which provide dramatic proof of the validity of the coupling model will be discussed. The applicability of the coupling model to some relaxations in metals including precipitates and the Snoek-Koster relaxation is less obvious but has recently been proposed, justified and demonstrated to be relevant by one of us (YNW). The applicability of the coupling model to these and other problems of immediate interest to participants of ICIFUAS-10 will be summarized and discussed. For Snoek-Koster relaxation, additional experimental data in ultra-high purity iron containing low concentration of carbon obtained by one of us (LBM) show characteristics that cannot be explained by Seeger's model of thermally activated formation of kink pairs on screw dislocations in the presence of foreign interstitial atoms, but are consistent with the coupling model. C1 NANJING UNIV, NATL LAB SOLID STATE MICROSTRUCT, NANJING, PEOPLES R CHINA. ACAD MIN & MET, PL-30059 KRAKOW, POLAND. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 40 TC 56 Z9 63 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 EI 1873-4669 J9 J ALLOY COMPD JI J. Alloy. Compd. PD SEP PY 1994 VL 211 BP 327 EP 332 DI 10.1016/0925-8388(94)90513-4 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PK471 UT WOS:A1994PK47100080 ER PT J AU SWANEKAMP, SB GROSSMANN, JM OTTINGER, PF COMMISSO, RJ GOYER, JR AF SWANEKAMP, SB GROSSMANN, JM OTTINGER, PF COMMISSO, RJ GOYER, JR TI POWER-FLOW BETWEEN A PLASMA-OPENING SWITCH AND A LOAD SEPARATED BY A HIGH-INDUCTANCE MAGNETICALLY INSULATED TRANSMISSION-LINE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FIELD PENETRATION; OPERATION; DIODE AB Results are presented from particle-in-cell simulations of the electron flow launched from a plasma opening switch (POS) into a magnetically insulated transmission line (MITL) as the POS opens. The opening process of the POS is treated by removing plasma from a fixed anode-cathode gap with an opening time of tau(rise). To be similar to opening switch experiments at Physics International, the simulations were performed with the same inductance L(MITL) between the POS and load. When L(MITL)/tau(rise) is large compared to the POS flow impedance, this inductance effectively isolates the POS from the load during the opening process and the POS voltage is insensitive to changes in the load impedance. Analysis and simulations show that the peak load power is maximized when the load impedance is equal to the POS flow impedance. In contrast to previous theories and simulations of magnetically insulated flows, a large amount of electron flow in the MITL is concentrated near the anode. This is a result of the high effective impedance imposed on the POS by the inductive load which causes a significant electron current loss in the POS. As a result, many electrons lose insulation on the load side of the POS gap and those that do flow into the MITL have been accelerated to nearly the full POS potential. Electrons then EXB drift on equipotential lines close to the anode as they enter the MITL and flow toward the load. Current losses in the MITL are observed due to the proximity of the electron flow to the anode. Some electrons flow from the MITL directly into the load and are registered as load current while others EXB drift back toward the POS along the cathode surface. This is possible because the electron flow launched into the MITL from the POS is large enough to cause sufficient positive image charges on the cathode so that the electric field points out of the cathode surface. C1 PHYS INT CO,SAN LEANDRO,CA 94577. RP SWANEKAMP, SB (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 25 TC 18 Z9 21 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1994 VL 76 IS 5 BP 2648 EP 2656 DI 10.1063/1.358506 PG 9 WC Physics, Applied SC Physics GA PD440 UT WOS:A1994PD44000012 ER PT J AU LARSON, DE HESSLINK, RL HROVAT, MI FISHMAN, RS SYSTROM, DM AF LARSON, DE HESSLINK, RL HROVAT, MI FISHMAN, RS SYSTROM, DM TI DIETARY-EFFECTS ON EXERCISING MUSCLE METABOLISM AND PERFORMANCE BY P-31-MRS SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE GLYCOLYSIS; PHOSPHATE SPECTROSCOPY; PHOSPHOCREATINE; VENTILATION; SKELETAL MUSCLE ID MAGNETIC-RESONANCE SPECTROSCOPY; BLOOD LACTATE ACCUMULATION; HIGH-FAT DIET; PROLONGED EXERCISE; INCREMENTAL EXERCISE; ANAEROBIC THRESHOLD; GLYCOGEN DEPLETION; SKELETAL-MUSCLE; FATIGUE; INHIBITION AB To determine how diet modulates short-term exercise capacity, skeletal muscle pH and bioenergetic state were examined by P-31-magnetic resonance spectroscopy in nine healthy volunteers. Subjects performed incremental quadriceps exercise to exhaustion after 5 days of high-carbohydrate (HCHO) or high-fat (HFAT) diet randomly assigned in crossover fashion and separated by a 2.5-day period of ad libitum mixed diet. Simultaneous measurements were made of pulmonary gas exchange, minute ventilation, and quadriceps muscle pH and phosphorylation potential. At rest and peak exercise, respiratory exchange ratio and minute ventilation were higher after HCHO than after HFAT (P < 0.05), reflecting greater CHO utilization. Peak O-2 consumption VO2) was not increased after HCHO (P > 0.05), but exercise duration was (339 +/- 34 s for HCHO vs. 308 +/- 25 s for HFAT; P < 0.05). HCHO was associated with a blunted early fall of phosphocreatine (PCr)/P-i vs. VO2 (-4.1 +/- 0.7 x 10(-2) min/ml for HCHO vs. -5.6 +/- 1.2 X 10(-2) min/ml for HFAT; P < 0.05). On both study days, the slope of PCr/P-i vs. VO2, before and after the PCr threshold, was correlated with exercise time. The results suggest that a diet rich in CHO improves exercise efficiency through beneficial effects on intracellular phosphorylation potential. C1 HARVARD UNIV,MASSACHUSETTS GEN HOSP,SCH MED,MASSACHUSETTS INST TECHNOL,BOSTON,MA 02114. NIDDKD,CLIN DIABET & NUTR SECT,PHOENIX,AZ 85016. HARVARD UNIV,MASSACHUSETTS GEN HOSP,SCH MED,MASSACHUSETTS INST TECHNOL,BOSTON,MA 02114. USN,HLTH RES CTR,SAN DIEGO,CA 92128. FU NHLBI NIH HHS [HL-07354-14, K08-HL-02593-01A2] NR 39 TC 20 Z9 20 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD SEP PY 1994 VL 77 IS 3 BP 1108 EP 1115 PG 8 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA PG916 UT WOS:A1994PG91600010 PM 7836111 ER PT J AU JAPOUR, AJ FISCUS, SA ARDUINO, JM MAYERS, DL REICHELDERFER, PS KURITZKES, DR AF JAPOUR, AJ FISCUS, SA ARDUINO, JM MAYERS, DL REICHELDERFER, PS KURITZKES, DR TI STANDARDIZED MICROTITER ASSAY FOR DETERMINATION OF SYNCYTIUM-INDUCING PHENOTYPES OF CLINICAL HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 ISOLATES SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Note ID HIV-1 BIOLOGICAL PHENOTYPE; ZIDOVUDINE RESISTANCE; DISEASE PROGRESSION; CELL-CULTURE; INFECTION; AIDS; INDIVIDUALS; TROPISM; CLONES; MT-2 AB A standardized assay in 96-well microtiter plates for syncytium-inducing (SI) human immunodeficiency virus type 1 phenotype detection using MT-2 cells has been developed. SI variants were found in 67% of the patients with advanced human immunodeficiency virus disease. The occurrence of the SI phenotype increased with lower CD4(+) counts. There was no association between p24 antigenemia and the SI phenotype. C1 HARVARD UNIV,SCH MED,BOSTON,MA 02215. UNIV N CAROLINA,DEPT MICROBIOL & IMMUNOL,CHAPEL HILL,NC 27599. WALTER REED ARMY INST RES,DEPT HIV DRUGS & GENE THERAPY,ROCKVILLE,MD 20850. NIAID,DIV AIDS,BETHESDA,MD 20892. UNIV COLORADO,HLTH SCI CTR,DIV INFECT DIS,DENVER,CO 80262. VET AFFAIRS MED CTR,DENVER,CO 80262. USN,INST MED RES,ROCKVILLE,MD. HARVARD UNIV,SCH PUBL HLTH,CTR STAT DATA ANAL,BOSTON,MA 02215. RP JAPOUR, AJ (reprint author), BETH ISRAEL HOSP,DEPT MED,DIV INFECT DIS,DANA 617,330 BROOKLINE AVE,BOSTON,MA 02215, USA. FU NIAID NIH HHS [AI 27659, AI 25868, AI 01101] NR 19 TC 79 Z9 79 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD SEP PY 1994 VL 32 IS 9 BP 2291 EP 2294 PG 4 WC Microbiology SC Microbiology GA PB541 UT WOS:A1994PB54100049 PM 7814561 ER PT J AU PEDERSON, ED MILLER, JW MATHESON, S SIMONSON, LG CHADWICK, DE COVILL, PJ TURNER, DW LAMBERTS, BL MORTON, HE AF PEDERSON, ED MILLER, JW MATHESON, S SIMONSON, LG CHADWICK, DE COVILL, PJ TURNER, DW LAMBERTS, BL MORTON, HE TI TRYPSIN-LIKE ACTIVITY LEVELS OF TREPONEMA-DENTICOLA AND PORPHYROMONAS-GINGIVALIS IN ADULTS WITH PERIODONTITIS SO JOURNAL OF CLINICAL PERIODONTOLOGY LA English DT Article DE TRYPSIN-LIKE ACTIVITY; TREPONEMA DENTICOLA; PORPHYROMONAS GINGIVALIS; PERIODONTITIS ID DL-ARGININE-NAPHTHYLAMIDE; API-ZYM SYSTEM; BACTEROIDES-GINGIVALIS; CREVICULAR FLUID; MONOCLONAL-ANTIBODIES; SUBGINGIVAL PLAQUE; BACTERIA; DISEASE; BANA; PERIODONTOPATHOGENS AB Treponema denticola (Td) and Porphyromonas gingivalis (Pg) are associated with human moderate and severe adult periodontal diseases. This study quantifies these two anaerobes and their trypsin-like (TL) activities in subgingival plaque collected from both clinically healthy and periodontally diseased sites of human periodontitis patients. Antigen levels of the microorganisms were determined by monoclonal antibodies and TL activities were measured by the fluorescent substrate Z-gly-gly-arg-AFC in a disc format. Significant positive correlations were observed between the antigen levels and the TL activities when the data were subjected to statistical analyses both on a site-specific and on a patient basis. Anaerobe synergism was found between Td and Pg in a continental US population, and positive correlations were found between anaerobe levels (individually and total) and clinical indicators of adult periodontitis. C1 USN,MED RES & DEV COMMAND,LAB A,BETHESDA,MD. NORTHWESTERN UNIV,SCH DENT,CHICAGO,IL 60611. DENTSPLY INT,YORK,PA. RP PEDERSON, ED (reprint author), USN,DENT RES INST,DIV IMMUNOL,BLDG 1-H,GREAT LAKES,IL 60088, USA. NR 33 TC 21 Z9 24 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0303-6979 J9 J CLIN PERIODONTOL JI J. Clin. Periodontol. PD SEP PY 1994 VL 21 IS 8 BP 519 EP 525 DI 10.1111/j.1600-051X.1994.tb01167.x PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA PF220 UT WOS:A1994PF22000002 PM 7989615 ER PT J AU SAMMONS, MT AF SAMMONS, MT TI PRESCRIPTION PRIVILEGES AND PSYCHOLOGY - REPLY SO JOURNAL OF CLINICAL PSYCHOLOGY IN MEDICAL SETTINGS LA English DT Article DE PRESCRIPTION PRIVILEGES; PSYCHOTROPIC MEDICATION; PSYCHOLOGY; PSYCHIATRY; DEPARTMENT OF DEFENSE AB The ability to prescribe psychoactive medications is a legitimate extension of the practice of psychology. Arguments raised against this proposition by Adams and Bieliauskas should not deter the profession from attaining prescriptive authority. Prescription privileges will expand the range of disorders and patient populations that psychologists can treat. Their acquisition will be of benefit to both the profession and the patient alike. RP SAMMONS, MT (reprint author), NATL NAVAL MED CTR, DEPT PSYCHOL, BETHESDA, MD 20814 USA. NR 17 TC 8 Z9 8 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 1068-9583 J9 J CLIN PSYCHOL MED S JI J. Clin. Psychol. Med. Settings PD SEP PY 1994 VL 1 IS 3 BP 199 EP 207 DI 10.1007/BF01989621 PG 9 WC Psychology, Clinical SC Psychology GA QY244 UT WOS:A1994QY24400002 PM 24227387 ER PT J AU DOWNS, LL NICHOLLS, RJ LEATHERMAN, SP HAUTZENRODER, J AF DOWNS, LL NICHOLLS, RJ LEATHERMAN, SP HAUTZENRODER, J TI HISTORIC EVOLUTION OF A MARSH ISLAND - BLOODSWORTH ISLAND, MARYLAND SO JOURNAL OF COASTAL RESEARCH LA English DT Article DE SEA-LEVEL RISE; CHESAPEAKE BAY; COASTAL WETLANDS; INUNDATION; COASTAL EROSION; GIS; PONDING ID CHESAPEAKE BAY; SEA-LEVEL; LAND LOSS; EROSION AB High rates of relative sea-level rise in the Chesapeake Bay of about 0.3 m/century has caused rapid land loss of the Bay islands. This study is the first quantitative analysis of both perimeter and interior land loss for one of the large marsh islands-Bloodsworth Island. A geographical information system (GIS) was used for the analysis at a resolution of about 16 meters. From 1849 to 1992, the area of Bloodsworth Island declined by 579 ha, or 26% of the land area in 1849. The land loss can be divided into four geomorphic types: perimeter land loss, channel widening, channel pending, and non-channel pending. Perimeter land loss is largest at 3.0 ha/yr from 1942 to 1992, but the three interior land loss types are also significant, totalling 1.6 ha/yr from 1942 to 1992. Channel pending and widening were responsible for nearly all interior land loss prior to 1942. The initial formation of nonchannel ponds is attributed to a short-term acceleration in sea-level rise (to 7 mm/yr from 1930 to 1948). Subsequently, non-channel pending has been significant, particularly in the southeastern quadrant of the island. Compared to the mainland marshes, interior land loss has occurred at much slower rates; this is probably due to the low thickness of the marsh deposits on Bloodsworth. To date, bombing appears to have only had a secondary impact on land loss at the scale of this study. In the future, the island appears increasingly vulnerable to interior break-up, particularly given another short-term acceleration of sea-level rise. C1 USN,CHESAPEAKE DIV,WASHINGTON,DC 20374. RP DOWNS, LL (reprint author), UNIV MARYLAND,DEPT GEOG,COASTAL RES LAB,COLLEGE PK,MD 20742, USA. RI Nicholls, Robert/G-3898-2010 OI Nicholls, Robert/0000-0002-9715-1109 NR 26 TC 21 Z9 23 U1 3 U2 5 PU COASTAL EDUCATION & RESEARCH FOUNDATION PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0749-0208 J9 J COASTAL RES JI J. Coast. Res. PD FAL PY 1994 VL 10 IS 4 BP 1031 EP 1044 PG 14 WC Environmental Sciences; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA PJ190 UT WOS:A1994PJ19000019 ER PT J AU MUKHERJEE, R ANDERSON, DP AF MUKHERJEE, R ANDERSON, DP TI A SURFACE INTEGRAL APPROACH TO THE MOTION PLANNING OF NONHOLONOMIC SYSTEMS SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article AB Nonholonomic mechanical systems are governed by constraints of motion that are nonintegrable differential expressions. Unlike holonomic constraints, these constraints do not reduce the number of dimensions of the configuration space of a system. Therefore a nonholonomic system can access a configuration space of dimension higher than the number of the degrees of freedom of the system. In this paper, we develop an algorithm for planning admissible trajectories for nonholonomic systems that will take the system from one point in its configuration space to another. In our algorithm the independent variables are first converged to their desired values. Subsequently, closed trajectories of the independent variables are used to converge the dependent variables. We use Green's theorem in our algorithm to convert the problem of finding a closed path into that of finding a surface area in the space of the independent variables such that the dependent variables converge to their desired values as the independent variables traverse along the boundary of this surface area. Using this approach, Mle specifically address issues related to the reachability of the system, motion planning amidst additional constraints, and repeatable motion of nonholonomic systems. The salient features of our algorithm ape quite apparent in the two examples we discuss: a planar space robot and a disk rolling without slipping on a flat surface. RP MUKHERJEE, R (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. RI Mukherjee, Ranjan/A-7518-2009 NR 17 TC 25 Z9 28 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD SEP PY 1994 VL 116 IS 3 BP 315 EP 325 DI 10.1115/1.2899226 PG 11 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA PJ922 UT WOS:A1994PJ92200001 ER PT J AU JORDAN, SA RAGAB, SA AF JORDAN, SA RAGAB, SA TI ON THE UNSTEADY AND TURBULENT CHARACTERISTICS OF THE 3-DIMENSIONAL SHEAR-DRIVEN CAVITY FLOW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID NAVIER-STOKES EQUATIONS; RECIRCULATING FLOW; NUMERICAL-SOLUTION; VISUALIZATION AB The three-dimensional shear-driven cavity flow is numerically investigated at Reynolds numbers of 5000 and 10000. This investigation focuses on the unsteadiness and turbulent characteristics of the flow. At the moderate Reynolds number (Re=5000) where the cavity flow is fully laminar, a direct numerical simulation (DNS) is used whereas large-eddy simulation (LES) methodology is adopted to predict the cavity flow at the higher Reynolds number (Re=10000). Establishing a suitable form for the subgrid scale (SGS) turbulence model in this complex flow is guided by the DNS results at Re=5000. Additionally, the SGS model is verified against DNS results at Re=7500 where the cavity flow is known through experimentation to be locally transitional. The LES results verify the published experimental evidence as well as uncover new flow features within the cavity. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT ENGN SCI & MECH,BLACKSBURG,VA 24061. RP JORDAN, SA (reprint author), USN,CTR UNDERSEA WARFARE,CODE 8322 BLDG 1246,NEWPORT,RI 02841, USA. NR 28 TC 11 Z9 11 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD SEP PY 1994 VL 116 IS 3 BP 439 EP 449 DI 10.1115/1.2910296 PG 11 WC Engineering, Mechanical SC Engineering GA PK459 UT WOS:A1994PK45900010 ER PT J AU EVANS, JS STRICKLAND, DJ ANDERSON, DE CONWAY, RR SMATHERS, HW BAKERIS, DF SWANSON, RA CHUBB, TA CARDON, JG AF EVANS, JS STRICKLAND, DJ ANDERSON, DE CONWAY, RR SMATHERS, HW BAKERIS, DF SWANSON, RA CHUBB, TA CARDON, JG TI ULTRAVIOLET PLUME INSTRUMENT IMAGING FROM THE LACE SATELLITE - ANALYSIS OF BROAD-BAND UV AURORAL LIMB DATA SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID TRANSPORT-THEORETIC MODEL; HYDROGEN ATOM AURORA; ELECTRON-PRECIPITATION; TOMOGRAPHIC INVERSION; EMISSION RATES; DISTRIBUTIONS; PHOTOMETRY AB Southern auroral limb images have been recorded by the wide-angle UV camera of the Ultraviolet plume instrument on board the Low-power Atmospheric Compensation Experiment satellite. Tangent altitudes within each image have been determined using recorded stars along with the known position of the satellite. Range to the observed aurora has been determined by stereoscopic techniques using images of the same auroral forms collected over several seconds. An auroral model has been used in conjunction with simulated annealing techniques to fit two limb profiles taken from a single image. The auroral model provides altitude profiles of volume emission for the relevant features based on electron transport calculations starting with a user-specified precipitating electron spectrum. Volume emission is then distributed within the observing region, followed by line-of-sight integration producing limb profiles. The fitting procedure provides distributions of the energy characteristics of the aurora over the relevant observing region. The results of the fitting process suggest that a quantitative description of the aurora has been achieved in terms of the most probable precipitating electron spectral characteristics and the spatial distribution of this precipitation. C1 ALLIED SIGNAL TECH SERV INC,ALEXANDRIA,VA 22314. USN,RES LAB,WASHINGTON,DC 20375. APPL COHERENT TECHNOL CORP,RESTON,VA. RP EVANS, JS (reprint author), COMPUTAT PHYS INC,2750 PROSPER AVE,SUITE 600,FAIRFAX,VA 22031, USA. NR 31 TC 2 Z9 2 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1994 VL 99 IS A9 BP 17591 EP 17600 DI 10.1029/94JA01143 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PF925 UT WOS:A1994PF92500034 ER PT J AU MEHAY, SL GONZALEZ, RA AF MEHAY, SL GONZALEZ, RA TI DISTRICT ELECTIONS AND THE POWER OF MUNICIPAL EMPLOYEE UNIONS SO JOURNAL OF LABOR RESEARCH LA English DT Article ID GOVERNMENT; COMPENSATION; POLICE; REFORM; LAWS AB Very little prior research has been devoted to the effects of the institutional structure of local government on public sector labor markets. This study addresses the differential effects of the two main systems used to elect city council members - district versus citywide (at-large) elections. The study hypothesizes that, in district-election cities, municipal employees, especially those who are unionized, face a lower cost of influencing city council candidates and, consequently, will have greater power to influence employment conditions. To test this hypothesis, data on U.S. cities over 25,000 population are used to estimate both reduced form and structural wage and employment equations. The results are consistent with the basic hypothesis: district elections provide a more fertile ground for municipal employees, especially those organized in unions, to affect their employment conditions. C1 SAN JOSE STATE UNIV,SAN JOSE,CA 95192. RP MEHAY, SL (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 21 TC 11 Z9 11 U1 1 U2 4 PU JOURNAL OF LABOR RESEARCH PI FAIRFAX PA DEPT ECONOMICS GEORGE MASON UNIV, FAIRFAX, VA 22030-4444 SN 0195-3613 J9 J LABOR RES JI J. Labor Res. PD FAL PY 1994 VL 15 IS 4 BP 387 EP 402 DI 10.1007/BF02685705 PG 16 WC Industrial Relations & Labor SC Business & Economics GA PA296 UT WOS:A1994PA29600005 ER PT J AU HEPP, MA MILLER, JB AF HEPP, MA MILLER, JB TI CHEMICAL-SHIFT CONTRAST IN NMR IMAGING OF ABUNDANT NUCLEI IN SOLIDS SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Note ID FOURIER-TRANSFORM NMR; STATE NMR; SELECTIVE EXCITATION; MAGNETIC-RESONANCE; SLICE SELECTION; GRADIENTS RP HEPP, MA (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,CODE 6122,WASHINGTON,DC 20375, USA. NR 15 TC 6 Z9 6 U1 1 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD SEP PY 1994 VL 110 IS 1 BP 98 EP 101 DI 10.1006/jmra.1994.1188 PG 4 WC Physics, Atomic, Molecular & Chemical SC Physics GA PH364 UT WOS:A1994PH36400017 ER PT J AU HITCHCOCK, GL ROSSBY, T LILLIBRIDGE, JL LESSARD, EJ LEVINE, ER CONNORS, DN BORSHEIM, KY MORK, M AF HITCHCOCK, GL ROSSBY, T LILLIBRIDGE, JL LESSARD, EJ LEVINE, ER CONNORS, DN BORSHEIM, KY MORK, M TI SIGNATURES OF STIRRING AND MIXING NEAR THE GULF-STREAM FRONT SO JOURNAL OF MARINE RESEARCH LA English DT Article ID WARM-CORE RING; STATES CONTINENTAL-SHELF; OCEAN; INTRUSIONS; SCALE; FINE; MICROSTRUCTURE; TEMPERATURE; TRANSPORT; DIFFUSION AB In October, 1986 the surface waters adjacent to the Gulf Stream front were surveyed with an undulating profiler to describe the finescale structure of the mixed layer. The profiler was a Seasoar equipped with a CTD and fluorometer. The survey first defined the structure of a cyclonic eddy which resembled frontal eddies of the South Atlantic Bight in sea surface temperature imagery. The Seasoar transects revealed, however, that the cyclonic eddy lacked a cold dome typically seen in frontal eddies. Farther downstream the Seasoar defined the structure of streamers of Gulf Stream and Shelf water wrapped about the southern edge of a warm-core ring. The streamers had lateral and along-axis dimensions on the order of approximate to 10 km and 100 km, respectively, and were bordered by narrow intrusive features. The temporal history of the streamers was described from SST imagery, and the surface flow derived from ship's drift vectors. CTD casts taken while following an isopycnal float provided a means to examine the structure of the intrusive features. Interleaving was evident at the boundaries of the streamers and intrusive features where high conductivity Cox numbers were concentrated, suggesting elevated microstructure activity. The Turner angle distribution, indicating either saltfingering or diffusive convection, did not correlate well with the Cox number distribution. This is interpreted as evidence that lateral, rather than diapycnal, mixing was the process mediating the exchange of properties at the boundaries of contrasting water types. In contrast to physical properties, the distribution of fluorescence showed relatively less structure in the surface layer between the ring and Gulf Stream front. In the surface layers of the two streamers the pigment and bacterial biomass, and the diatom species composition, were typical of Slope water communities. We hypothesize that small-scale mixing processes concentrated at the boundaries of the streamers were the mechanism by which Slope water plankton were seeded into streamers of different hydrographic origins. Presumably, high netplankton growth rates allowed the Slope water species to dominate the communities in the streamers. C1 UNIV RHODE ISL,GRAD SCH OCEANOG,NARRAGANSETT,RI 02882. NOAA,NATL OCEAN SERV,SILVER SPRING,MD 20910. UNIV WASHINGTON,SCH OCEANOG,SEATTLE,WA 98195. USN,UNDERSEA WARFARE CTR,CODE 8212,NEWPORT,RI 02841. UNIV TRONDHEIM,NORWEGIAN INST TECHNOL,N-7034 TRONDHEIM,NORWAY. UNIV BERGEN,INST GEOFYS,BERGEN,NORWAY. RP HITCHCOCK, GL (reprint author), UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,MIAMI,FL 33149, USA. RI Lillibridge, John/F-5606-2010 OI Lillibridge, John/0000-0001-9102-171X NR 52 TC 15 Z9 15 U1 2 U2 4 PU KLINE GEOLOGY LABORATORY PI NEW HAVEN PA YALE UNIV, NEW HAVEN, CT 06520 SN 0022-2402 J9 J MAR RES JI J. Mar. Res. PD SEP PY 1994 VL 52 IS 5 BP 797 EP 836 DI 10.1357/0022240943076885 PG 40 WC Oceanography SC Oceanography GA PK148 UT WOS:A1994PK14800002 ER PT J AU MITRA, S AF MITRA, S TI STRAIN-HARDENING IN A DISPERSION-STRENGTHENED AL-FE, V, SI ALLOY AT ELEVATED-TEMPERATURES SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; DEFORMATION; DUCTILITY C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI GRP,MONTEREY,CA 93943. NR 20 TC 6 Z9 7 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD SEP 1 PY 1994 VL 13 IS 17 BP 1296 EP 1300 DI 10.1007/BF00270966 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA PE420 UT WOS:A1994PE42000024 ER PT J AU KELLY, DJ DASCH, GA CHAN, TC HO, TM AF KELLY, DJ DASCH, GA CHAN, TC HO, TM TI DETECTION AND CHARACTERIZATION OF RICKETTSIA-TSUTSUGAMUSHI (RICKETTSIALES, RICKETTSIACEAE) IN INFECTED LEPTOTROMBIDIUM (LEPTOTROMBIDIUM) FLETCHERI CHIGGERS (ACARI, TROMBICULIDAE) WITH THE POLYMERASE CHAIN-REACTION SO JOURNAL OF MEDICAL ENTOMOLOGY LA English DT Article DE RICKETTSIA-TSUTSUGAMUSHI; LEPTOTROMBIDIUM-FLETCHERI; POLYMERASE CHAIN REACTION ID MOLECULAR-CLONING; SEQUENCE-ANALYSIS; SCRUB TYPHUS; ANTIGEN; GENE AB We developed a method for detecting and characterizing the DNA of Rickettsia tsutsugamushi in chiggers (larval trombiculid mites) by polymerase chain reaction (PCR). Three procedures for extracting DNA from frozen chiggers were compared by evaluating the yield of PCR amplicand obtained with nine oligonucleotide primer pairs derived from the rickettsial 22 kD, 47 kD, groESL, 56 kD, and 110 kD antigen genes. Although extracts and primer pairs differed in amplification efficiency, R. tsutsugamushi DNA was successfully detected in extracts of colonized infected Leptotrombidium (Leptotrombidium) fletcheri (Wormersley & Heaslip) chiggers and in uninfected chigger extracts seeded with known amounts of Karp-strain rickettsiae. The 22 kD gene restriction fragment length polymorphisms (RFLP) observed in PCR amplicands from five rickettsial isolates obtained from the infected chigger colony over a 26-yr period were identical to those of PCR amplicands derived directly from infected chiggers taken from the same colony. This suggests that stable transmission of R. tsutsugamushi occurs in mites (62 generations), and isolates encompass the full genetic heterogeneity found in the chigger. PCR/RFLP analysis is an important new tool for investigating the complex epidemiology of scrub typhus rickettsiae in their mite vectors. C1 USN,MED RES INST,VIRAL & RICKETTSIAL DIS PROGRAM,BETHESDA,MD 20889. WALTER REED ARMY MED CTR,DIV COMMUNICABLE DIS & IMMUNOL,WASHINGTON,DC 20307. INST MED RES,DIV ACAROL,50588 KUALA LUMPUR,MALAYSIA. NR 25 TC 24 Z9 26 U1 0 U2 0 PU ENTOMOL SOC AMER PI LANHAM PA 9301 ANNAPOLIS RD, LANHAM, MD 20706 SN 0022-2585 J9 J MED ENTOMOL JI J. Med. Entomol. PD SEP PY 1994 VL 31 IS 5 BP 691 EP 699 PG 9 WC Entomology; Veterinary Sciences SC Entomology; Veterinary Sciences GA PF625 UT WOS:A1994PF62500009 PM 7966172 ER PT J AU LIGHT, WR GABER, BP AF LIGHT, WR GABER, BP TI NANOVISION - MOLECULAR GRAPHICS FOR THE MACINTOSH SO JOURNAL OF MOLECULAR GRAPHICS LA English DT Article DE NANOVISION; MOLECULAR GRAPHICS; MACINTOSH ID SURFACES; DISPLAY AB Nano Vision is a molecular graphics program for the Apple Macintosh. The program follows accepted Macintosh design criteria, making it easy to learn by anyone familiar with the Macintosh. Molecules containing up to 32,000 atoms may be displayed. The program includes a range of molecular display options, including skeletal, ball-and-stick, and CPK. Images may be displayed using up to 240 colors. Color depth cuing is provided, as is Z-clipping. NanoVision images may be easily transferred (cut and paste) to drawing programs. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 24 TC 1 Z9 1 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0263-7855 J9 J MOL GRAPHICS JI J. Mol. Graph. PD SEP PY 1994 VL 12 IS 3 BP 172 EP 177 DI 10.1016/0263-7855(94)80084-7 PG 6 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Computer Science, Interdisciplinary Applications; Crystallography; Mathematical & Computational Biology SC Biochemistry & Molecular Biology; Computer Science; Crystallography; Mathematical & Computational Biology GA PH211 UT WOS:A1994PH21100003 PM 7819158 ER PT J AU ROSZAK, S LOWREY, AH SOKALSKI, WA KAUFMAN, JJ AF ROSZAK, S LOWREY, AH SOKALSKI, WA KAUFMAN, JJ TI USEFULNESS OF ONE-ELECTRON PROPERTIES IN THE STUDY OF THE NITROMETHANE-TO-METHYL NITRITE REARRANGEMENT SO JOURNAL OF MOLECULAR GRAPHICS LA English DT Article DE ELECTROSTATIC POTENTIAL; CUMULATIVE ATOMIC MULTIPOLE MOMENTS (CAMM); MULTIPLE REFERENCE DOUBLE-EXCITATION CONFIGURATION INTERACTION METHOD (MRD-CI); NITROMETHANE-METHYL NITRITE REARRANGEMENT; ELECTRONIC EXCITED STATES ID MOLECULAR CHARGE-DISTRIBUTION; ATOMIC MULTIPOLE MOMENTS; STATE POTENTIAL CURVES; CONFIGURATION-INTERACTION; ENERGY EXTRAPOLATION; CI CALCULATIONS; ABINITIO; DECOMPOSITION; SURFACES; PYROLYSIS AB Large-scale multiple reference configuration interaction calculations for a unimolecular rearrangement reaction of nitromethane to methyl nitrite are presented. The complicated structure of potential energy curves is explained in terms of interactions between ground and excited states. An explanation for an extremely long C-N and C-O bond distances in the transition state is also given. The study of corresponding dipole moments and electrostatic molecular potentials enhances the overall understanding of the reaction. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. INST PHYS & THEORET CHEM,WROCLAW,POLAND. JOHNS HOPKINS UNIV,DEPT CHEM,BALTIMORE,MD 21218. RI Sokalski, Waclaw/I-6151-2012 NR 43 TC 1 Z9 1 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0263-7855 J9 J MOL GRAPHICS JI J. Mol. Graph. PD SEP PY 1994 VL 12 IS 3 BP 207 EP 211 DI 10.1016/0263-7855(94)80089-8 PG 5 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Computer Science, Interdisciplinary Applications; Crystallography; Mathematical & Computational Biology SC Biochemistry & Molecular Biology; Computer Science; Crystallography; Mathematical & Computational Biology GA PH211 UT WOS:A1994PH21100007 PM 7819161 ER PT J AU RULLER, JA JEWELL, JM AF RULLER, JA JEWELL, JM TI RAMAN AND INFRARED-SPECTRA OF LEAD GALLOSILICATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID METAL OXIDE GLASSES; SILICATE-GLASSES; ALKALI AB Infrared and Raman spectra for two series of lead gallosilicate glasses were measured. Vibrational spectra are fully consistent with a previous structural model for these glasses consisting of two 'sub'-networks of polyhedral chains, i.e., a gallium tetrahedral network and a lead pyramidal network, intertwined in various configurations. Silica enters the glass substituting directly for GaO4 tetrahedra in the gallium sub-network. Vibrational bands associated with the bonds necessary to form this type of structure are present in both infrared and Raman spectra. Discrete sub-networks are indicated by the presence of separate bands attributable to both Ga-O-Ga bonds and Pb-O bonds (contained within lead chains). The intensities and frequencies of these bands as well as those attributable to intra-network bonds vary with composition in a manner predicted by the structural model. The Si-O vibration frequency is close to that reported elsewhere for the vibrational band associated with Si-O-Ga bridges. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. NR 16 TC 16 Z9 16 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 175 IS 1 BP 91 EP 97 DI 10.1016/0022-3093(94)90319-0 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PL204 UT WOS:A1994PL20400011 ER PT J AU COLMENERO, J ARBE, A ALEGRIA, A NGAI, KL AF COLMENERO, J ARBE, A ALEGRIA, A NGAI, KL TI Q-DEPENDENCE OF THE RELAXATION-TIMES OF THE ALPHA-RELAXATION AS OBSERVED BY QUASI-ELASTIC NEUTRON-SCATTERING SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID LOCAL CHAIN MOTION; GLASS-TRANSITION; SPIN-ECHO; DYNAMICS; TEMPERATURE; BEHAVIOR; POLYMERS AB In a quasielastic neutron scattering investigation of three polymers, poly(vinyl methyl ether), poly(vinyl chloride) and poly(bisphenol A, 2-hydroxypropylether), it was found that the incoherent quasielastic broadening corresponding to the alpha-relaxation can be well described assuming a Kohlrausch-Williams-Watts intermediate scattering function I(Q,t) proportional to exp[ - (t/tau(WW))(beta)]. The relaxation time, tau(WW)(Q,T), varies with Q (momentum transfer) as Q(-kappa)(kappa > 2; kappa being dependent on the system) in the Q-range investigated. It was also found that this Q-behaviour and the non-Debye behaviour, defined by the beta parameter, are directly correlated. In this paper, it is shown that these features are also found in different glass-forming systems (PIB, PDMS, PPO, OTP,...) when the available quasielastic neutron scattering and relaxation data of the literature are reinterpreted. Finally, a very simple scenario based on the coupling model of Ngai, which accounts for the experimental behaviour found, is described. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP COLMENERO, J (reprint author), UNIV BASQUE COUNTRY, FAC QUIM, DEPT FIS MAT, APARTADO 1072, E-20080 SAN SEBASTIAN, SPAIN. RI Arbe, Arantxa/G-8178-2015; Colmenero, Juan/G-8725-2015; ALEGRIA, ANGEL/H-1035-2015 OI Arbe, Arantxa/0000-0002-5137-4649; Colmenero, Juan/0000-0002-2440-4953; ALEGRIA, ANGEL/0000-0001-6125-8214 NR 23 TC 28 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 229 EP 233 DI 10.1016/0022-3093(94)90440-5 PN 1 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PJ196 UT WOS:A1994PJ19600032 ER PT J AU TRINGIDES, MC NGAI, KL AF TRINGIDES, MC NGAI, KL TI PHENOMENOLOGICAL ANALOGIES BETWEEN NONEQUILIBRIUM AND CORRELATED SYSTEMS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID MOLECULAR-DYNAMICS SIMULATION; COUPLING MODEL; KINETICS; GROWTH; DIFFUSION; POLYMER AB The time evolution of physical systems towards equilibrium and the relaxation of correlated systems shows interesting phenomenological analogies. Growth exponents are used to describe the evolution of the average domain size L similar to t(x) in non-equilibrium systems and the autocorrelation function of correlated systems, C(t) similar to e(-(t/tau)x). The energetics follow a simple relation between the collective and the microscopic activation energies E(D) = E(A)/x. Sublinear diffusive motions R(2) similar to t(1-X) ((1 - x) < 1) have also been observed in the two systems. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. USN,RES LAB,DIV ELECTR & SCI,WASHINGTON,DC 20375. RP TRINGIDES, MC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 20 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 412 EP 419 DI 10.1016/0022-3093(94)90466-9 PN 1 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PJ196 UT WOS:A1994PJ19600058 ER PT J AU RIZOS, AK NGAI, KL PISPAS, S HADJICHRISTIDIS, N AF RIZOS, AK NGAI, KL PISPAS, S HADJICHRISTIDIS, N TI SOLVENT REORIENTATION IN BLOCK-COPOLYMER SOLUTIONS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID FLOW BIREFRINGENCE PROPERTIES; POLYMER-SOLUTIONS; AROCLOR SOLUTIONS; POLYSTYRENE AROCLOR; FRICTION; POLYBUTADIENE; DYNAMICS; MOBILITY AB The effect of added polymer on the relaxational characteristics of the chlorinated biphenyl solvent also known as Aroclor (A1248) has been studied by photon correlation spectroscopy in the depolarized mode and by dielectric spectroscopy. Modifications of the solvent reorientation dynamics in solutions containing polyisoprene (PI), polystyrene (PS), 1,2-polybutadiene (1,2-PB) and 1,4-polybutadiene (1,4-PB) have been established previously. The experiments have been extended to solutions of Aroclor with poly(styrene-b-1,4-isoprene) block copolymers. The measurements of the reorientational dynamics of Aroclor show an intermediate behavior between that observed in PS/Aroclor and PI/Aroclor systems. C1 UNIV CRETE,RES CTR CRETE,GR-71409 IRAKLION,GREECE. USN,RES LAB,WASHINGTON,DC 20375. UNIV ATHENS,DEPT CHEM,GR-10680 ATHENS,GREECE. RP RIZOS, AK (reprint author), UNIV CRETE,DEPT CHEM,GR-71409 IRAKLION,GREECE. RI Rizos, Apostolos/F-6807-2011 NR 20 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 786 EP 789 DI 10.1016/0022-3093(94)90578-9 PN 2 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000018 ER PT J AU ROLAND, CM NGAI, KL AF ROLAND, CM NGAI, KL TI CONSTRAINT DYNAMICS AND CHEMICAL-STRUCTURE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID LOCAL CHAIN MOTION; NEUTRON-SCATTERING EXPERIMENTS; BULK AMORPHOUS POLYMERS; SEGMENTAL RELAXATION; DIELECTRIC-RELAXATION; CONFORMATIONAL TRANSITIONS; GLASS-TRANSITION; INTERMOLECULAR COOPERATIVITY; TEMPERATURE-DEPENDENCE; ALPHA-RELAXATION AB The effect of chemical structure on the segmental relaxation behavior is examined for a wide range of polymers. Both the time and temperature dependence of the glass transition dispersion in the dielectric loss spectrum are shown to be correlated with the degree to which local structure engenders steric constraints on the relaxation from neighboring non-bonded segments. The severity of the intermolecular constraints on segmental relaxation can be related in a plausible fashion to the polymer's chemical structure; specifically, polymers with smoother, less polar, more compact, symmetric or flexible chain backbones and/or having less sterically hindering pendant groups experience weaker constraints on their segmental relaxation from interactions with neighboring, non-bonded segments. When amorphous, such polymers exhibit a near Arrhenius temperature dependence and close to Debye-like relaxation. Polymers having less flexible backbones and/or sterically hindering pendant groups exhibit broad segmental dispersions and temperature dependencies near the extreme fragile edge; these characteristics reflect segmental relaxation that is strongly intermolecularly cooperative. This correlation interprets the behavior in terms of steric effects and backbone structure; no recourse to free volume considerations is necessary. The data for polymers parallel observations made on small molecule glass-forming liquids, whose chemical structure similarly governs the strength of the intermolecular coupling, and thus the time and temperature dependence of segmental relaxation. RP ROLAND, CM (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 49 TC 24 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 868 EP 875 DI 10.1016/0022-3093(94)90591-6 PN 2 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000031 ER PT J AU MCGRATH, KJ ROLAND, CM AF MCGRATH, KJ ROLAND, CM TI CONCENTRATION FLUCTUATIONS AND DYNAMIC HETEROGENEITY IN PIP/PVE BLENDS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID TIME TEMPERATURE SUPERPOSITION; NUCLEAR-MAGNETIC-RESONANCE; MISCIBLE POLYMER BLENDS; SOLID-STATE; SEGMENTAL RELAXATION; GLASS-TRANSITION; C-13 NMR; POLYSTYRENE; DILUENT; POLYISOPRENE AB Usually the shape of the glass transition dispersion in the mechanical or dielectric spectra of pure polymers is skewed toward higher frequencies. In miscible polymer blends not only is this peak broader than in pure polymers, the broadening is often asymmetric towards lower frequencies. Concentration fluctuations are an obvious source of the broadening; however, a simple distribution of relaxation times, corresponding to a distribution in local compositions, would not account for the reversal in the asymmetry of the dispersion. Intrinsic differences in component mobilities, as directly seen in solid state nuclear magnetic resonance experiments, also exert an influence on segmental relaxation in blends. The differences in the components' segmental relaxation behaviors are also manifested in the thermorheological complexity of miscible blends. An approach to blend dynamics based on the coupling model of relaxation can successfully describe the most prominent features. RP MCGRATH, KJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 41 TC 19 Z9 19 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 891 EP 896 DI 10.1016/0022-3093(94)90594-0 PN 2 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000034 ER PT J AU MCGRATH, KJ MILLER, JB ROLAND, CM AF MCGRATH, KJ MILLER, JB ROLAND, CM TI MISCIBILITY IN POLY(VINYLETHYLENE)/POLY(ISOPRENE) BLENDS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID NUCLEAR-MAGNETIC-RESONANCE; NEGATIVE EXCESS ENTHALPY; MISCIBLE BLENDS; CIS-1,4-POLYISOPRENE; CRYSTALLIZATION; POLYMERS AB Poly(vinylethylene) (PVE) and polyisoprene (PIP) do not chemically interact; nevertheless, miscibility extends to infinite molecular weight of the components, indicating that the interaction parameter for the blend is negative. This inference has been directly demonstrated by small angle neutron scattering, which showed, moreover, that the negative sign has an enthalpic origin. The present solid state nuclear magnetic resonance (NMR) cross-polarization/dipolar dephasing results are consistent with a greater degree of spatial intimacy between PVE and PIP chains in the blend relative to the neat polymers. The greater intimacy suggested by the NMR results is consistent with stronger van der Waals bonding in the blends, and hence the negative mixing enthalpy. RP MCGRATH, KJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 20 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 897 EP 901 DI 10.1016/0022-3093(94)90595-9 PN 2 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000035 ER PT J AU SANTANGELO, PG ROLAND, CM NGAI, KL RIZOS, AK KATERINOPOULOS, H AF SANTANGELO, PG ROLAND, CM NGAI, KL RIZOS, AK KATERINOPOULOS, H TI DIELECTRIC AND MECHANICAL RELAXATION IN PMPS, BMC AND THEIR MIXTURES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID FREE-VOLUME INTERPRETATION; MISCIBLE POLYMER BLENDS; SEGMENTAL RELAXATION; SOLVENT DYNAMICS; VISCOELASTIC PROPERTIES; AMORPHOUS POLYMERS; AROCLOR SOLUTIONS; LIGHT-SCATTERING; POLYISOPRENE; GLASS AB Dielectric and dynamical mechanical measurements have been performed on mixtures of the small molecule glass-forming liquid 1,1-bis(p-methoxyphenyl) cyclohexane (BMC) with poly(methylphenylsiloxane) (PMPS). Earlier measurements had indicated that the BMC dynamics are modified in a very interesting way by the presence of the polymer, despite the equivalence of their glass transition temperatures, T-g. By varying the molecular weight of the polymer (and hence T-g), the BMC mobility is anomalously enhanced in mixtures of high T-g PMPS. An interpretation for these results based on the coupling model of relaxation is suggested. C1 UNIV CRETE,DEPT CHEM,GR-71409 IRAKLION,GREECE. FDN RES & TECHNOL HELLAS,GR-71409 IRAKLION,GREECE. RP SANTANGELO, PG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Rizos, Apostolos/F-6807-2011 NR 46 TC 23 Z9 23 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 1084 EP 1093 DI 10.1016/0022-3093(94)90627-0 PN 2 PG 10 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000067 ER PT J AU KANERT, O KUCHLER, R DIECKHOFER, J LU, X JAIN, H NGAI, KL AF KANERT, O KUCHLER, R DIECKHOFER, J LU, X JAIN, H NGAI, KL TI STUDY OF LOW-FREQUENCY EXCITATIONS IN DISORDERED SOLIDS BY NUCLEAR-MAGNETIC-RESONANCE AND ELECTRICAL-CONDUCTIVITY SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID LITHIUM GERMANATE GLASSES; SPIN-LATTICE RELAXATION; IONIC-CONDUCTIVITY; SUPERIONIC GLASSES; AC-CONDUCTIVITY; CONDUCTORS; RESPONSES AB Nuclear spin relaxation (NSR) and electrical conductivity observed in various inorganic oxide glasses at low temperatures are found to be related by the fluctuation-dissipation theorem indicating a common physical origin of the relaxation mechanism due to fluctuating charges which belong to structural low-energy configurations intrinsic to the glassy state. However, in heavy metal fluoride glasses, NSR is shown to detect additional fluctuations which are not observed by conductivity experiments. The underlying relaxation process is caused by magnetic fluctuations without any accompanying charge motions. C1 LEHIGH UNIV,DEPT MAT SCI & ENGN,BETHLEHEM,PA 18015. USN,RES LAB,WASHINGTON,DC 20375. RP KANERT, O (reprint author), UNIV DORTMUND,INST PHYS,D-44221 DORTMUND,GERMANY. NR 21 TC 23 Z9 23 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 1277 EP 1284 DI 10.1016/0022-3093(94)90653-X PN 2 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000093 ER PT J AU KUCHLER, R KANERT, O FRICKE, M JAIN, H NGAI, KL AF KUCHLER, R KANERT, O FRICKE, M JAIN, H NGAI, KL TI STUDY OF NUCLEAR-SPIN RELAXATION IN CLAP GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID IONIC CONDUCTORS AB F-19 nuclear spin relaxation (NSR) rates are reported at various frequencies between room temperature and about 800 K, i.e., below and above the glass transition temperature, T-g congruent to 570 K, for glasses of the general composition CdF2-LiF-AlF3-PbF2 (CLAP glasses). The observed NSR rate comes from three different contributions. These contributions are related to degrees of freedom of the F- ions, and are compared with conductivity data performed by Moynihan and co-workers on the same glass. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV DORTMUND,INST PHYS,W-4600 DORTMUND,GERMANY. LEHIGH UNIV,BETHLEHEM,PA 18015. NR 10 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 1373 EP 1377 DI 10.1016/0022-3093(94)90665-3 PN 2 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000105 ER PT J AU GREAVES, GN NGAI, KL AF GREAVES, GN NGAI, KL TI IONIC TRANSPORT-PROPERTIES IN OXIDE GLASSES DERIVED FROM ATOMIC-STRUCTURE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID MIXED ALKALI GLASSES; SILICATE-GLASSES; CONDUCTORS; DIFFUSION AB The atomic environments of alkalis are affected by the presence of other alkalis, suggesting that they are juxtaposed in the glass structure. Indeed there is mounting evidence from local structure spectroscopies, e.g., X-ray absorption fine structure (XAFS) from alkalis and oxygen magic angle spinning nuclear magnetic resonance (MAS-NMR), pointing to alkalis being coordinated primarily to non-bridging oxygens and microsegregated in silicate glasses. Reconfiguration of oxygens must therefore accompany the nearest neighbour hopping of alkalis. Simple expressions for the conformational energy associated with this and for the electrostatic energy contributions to the total microscopic energy barrier, E(a), facing the migrating alkali are presented. Cooperative effects manifest in the ac electrical conductivity, sigma(ac), are considered and it is argued that these come into play for high concentrations of alkali in the de electrical conductivity, sigma(dc), and in the self diffusion, D, and that the macroscopic activation energy, W,is related to E(a) by W=E(a)/beta, where beta is the Kohlrausch exponent which can be obtained from sigma(ac). It is proposed that since at low concentrations of alkali (i.e., below the percolation threshold) beta approaches unity, alkalis become decoupled and hopping to more distant sites will become more frequent in consequence, with E(a) approximating to the binding energy of the alkali. In mixed alkali glasses, similar considerations apply to each of the alkalis. The majority alkali will mainly engage in nearest neighbour hopping, largely unaffected by the presence other alkali, while the minority alkali, because it is largely surrounded by foreign alkalis, will be constrained to hop to more distant sites. By parameterising these expressions for E(a) for both single and mixed alkali glasses from XAFS and MAS-NMR results, one is able to predict W for sigma(dc) and D, obtaining good agreement with literature values for sodium and potassium silicates. Simple hopping expressions are used to predict the pre-exponents for these glasses in terms of the alkali concentration, the hopping distance and the hopping attempt frequency, all which can be obtained from the glass composition, alkali XAFS and far IR absorption, respectively. Agreement with transport values is encouraging. From the pre-exponents and activation energies, one can therefore quantitatively predict sigma(dc) and D at any temperature, including the pronounced minimum in the sigma(dc) isotherms across a sodium-potassium silicate glass series. C1 UNIV MANCHESTER,DEPT GEOL,MANCHESTER M13 9PL,LANCS,ENGLAND. USN,RES LAB,WASHINGTON,DC 20375. RP GREAVES, GN (reprint author), SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. NR 40 TC 30 Z9 30 U1 1 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 1378 EP 1388 DI 10.1016/0022-3093(94)90666-1 PN 2 PG 11 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000106 ER PT J AU KANERT, O HACKMANN, A KUCHLER, R NGAI, KL AF KANERT, O HACKMANN, A KUCHLER, R NGAI, KL TI NUCLEAR-SPIN RELAXATION IN ELECTROLYTE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 2nd International Discussion Meeting on Relaxations in Complex Systems CY JUN 28-JUL 08, 1993 CL ALICANTE, SPAIN ID TEMPERATURES AB Nuclear spin relaxation (NSR) experiments in the laboratory and rotating frame were performed between about 2 K and room temperature in the following electrolyte glasses: LiCl.7H(2)O, LiBr.7H(2)O, ZnCl2.7H(2)O, and NaOH.7H(2)O. The data exhibit common features for all the glasses independent of the probe nuclei. In the low temperature region below T-*, the temperature and frequency dependence of the NSR data obey approximately a power law of the form 1/T-1 proportional to T(1+alpha)omega(-beta), which can be interpreted consistently in the framework of low-frequency excitations of disorder modes. Above T-*, the NSR rates become dominated by diffusive motion of alkali ions resulting in an asymmetric relaxation rate peak near T-g. The findings were analyzed by means of a non-Debye relation for the motion-induced NSR. C1 USN,RES LAB,DIV ELECTR & SCI,WASHINGTON,DC 20375. RP KANERT, O (reprint author), UNIV DORTMUND,INST PHYS,POB 500,D-44221 DORTMUND,GERMANY. NR 9 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP 1424 EP 1430 DI 10.1016/0022-3093(94)90672-6 PN 2 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PK610 UT WOS:A1994PK61000112 ER PT J AU NGAI, KL RIANDE, E WRIGHT, GB AF NGAI, KL RIANDE, E WRIGHT, GB TI PROCEEDINGS OF THE 2ND INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX-SYSTEMS .1. ALICANTE, SPAIN, 28 JUNE 8 JULY, 1993 - PREFACE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Editorial Material C1 CSIC,INST CIENCIA & TECNOL POLIMEROS,E-28006 MADRID,SPAIN. OFF NAVAL RES,ARLINGTON,VA 22217. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1994 VL 172 BP R7 EP R8 DI 10.1016/0022-3093(94)90407-3 PN 1 PG 2 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PJ196 UT WOS:A1994PJ19600001 ER PT J AU GOINS, B KLIPPER, R RUDOLPH, AS PHILLIPS, WT AF GOINS, B KLIPPER, R RUDOLPH, AS PHILLIPS, WT TI USE OF TECHNETIUM-99M-LIPOSOMES IN TUMOR IMAGING SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE TUMOR IMAGING; TC-99M; LIPOSOMES ID TC-99M-LABELED LIPOSOMES; PROLONGED CIRCULATION; BIODISTRIBUTION; CANCER; LOCALIZATION; INFECTION; VESICLES; INVIVO; MICE; RATS AB In this study, liposomes labeled with Tc-99m have been evaluated as tumor imaging agents. Methods: Liposomes containing reduced glutathione and carrying either a negative surface charge or no surface charge were labeled with (TC)-T-99m using the lipophilic chelator, hexamethylpropyleneamine oxime (HMPAO). The Tc-99m-liposomes were intravenously injected into the tail vein of nude mice which had been implanted intramuscularly in the thigh with nontransfected Chinese hamster ovary cells. Gamma camera images were acquired at 1, 4 and 22 hr and compared with tissue biodistribution studies at 24 hr postinjection. Results: Tumors could be distinguished from normal thigh muscle at 4 hr postinjection for both formulations. Tumor-to-muscle ratios were not significantly different for the two formulations due to the increased normal muscle activity at 24 hr for the neutral liposomes. Liver-to-tumor, liver-to-blood, spleen-to-tumor and spleen-to-blood ratios were significantly lower for the neutral Tc-99m-liposomes than for the negative Tc-99m-liposomes. Neutral Tc-99m-liposomes were cleared slower by the reticuloendothelial system, and therefore remained in the circulation for a longer period of time. Conclusion: The results of this study indicate that both formulations could be used as tumor imaging agents, but that neutral Tc-99m-liposomes would be more suitable as a drug delivery agent due to their increased total uptake by the tumor and decreased nonspecific uptake by the reticuloendothelial system. C1 UNIV TEXAS,HLTH SCI CTR,DEPT RADIOL,SAN ANTONIO,TX 78284. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RI Goins, Beth/F-1311-2010; Phillips, William/E-8427-2010 OI Phillips, William/0000-0001-8248-7817 NR 35 TC 33 Z9 35 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD SEP PY 1994 VL 35 IS 9 BP 1491 EP 1498 PG 8 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA PE096 UT WOS:A1994PE09600019 PM 8071699 ER PT J AU CURLEE, C AF CURLEE, C TI CATALOG OF TERATOGENIC AGENTS, 7TH EDITION - SHEPARD,T SO JOURNAL OF NURSE-MIDWIFERY LA English DT Book Review RP CURLEE, C (reprint author), USN HOSP,CAMP PENDLETON,CA, USA. NR 1 TC 0 Z9 0 U1 2 U2 7 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0091-2182 J9 J NURSE-MIDWIFERY JI J. Nurse-Midwifery PD SEP-OCT PY 1994 VL 39 IS 5 BP 340 EP 341 DI 10.1016/0091-2182(94)90144-9 PG 2 WC Nursing SC Nursing GA PG908 UT WOS:A1994PG90800010 ER PT J AU IMREY, PB CHILTON, NW PIHLSTROM, BL PROSKIN, HM KINGMAN, A LISTGARTEN, MA ZIMMERMAN, SO CIANCIO, SG COHEN, ME DAGOSTINO, RB FINE, D FISCHMAN, SL FLEISS, JL GUNSOLLEY, JC KENT, RL KILLOY, WJ LASTER, LL MARKS, RG VARMA, AO AF IMREY, PB CHILTON, NW PIHLSTROM, BL PROSKIN, HM KINGMAN, A LISTGARTEN, MA ZIMMERMAN, SO CIANCIO, SG COHEN, ME DAGOSTINO, RB FINE, D FISCHMAN, SL FLEISS, JL GUNSOLLEY, JC KENT, RL KILLOY, WJ LASTER, LL MARKS, RG VARMA, AO TI PROPOSED GUIDELINES FOR AMERICAN-DENTAL-ASSOCIATION ACCEPTANCE OF PRODUCTS FOR PROFESSIONAL, NONSURGICAL TREATMENT OF ADULT PERIODONTITIS SO JOURNAL OF PERIODONTAL RESEARCH LA English DT Article DE ADULT PERIODONTITIS; AMERICAN DENTAL ASSOCIATION; EFFICACY; CLINICAL TRIALS ID CLINICAL-TRIALS; DESIGN; ISSUES AB Guidelines are suggested for determining efficacy of products to supplement scaling and root planing in professional, non-surgical treatment of adult periodontitis. They result from an extended process including a conference on clinical trials in gingivitis and periodontitis, a subsequent workshop, and commentary from industrial, academic, professional and governmental members of the periodontal research community on two drafts. Recommendations are made in the broad areas of basic study design, subject and periodontal site selection, clinical management, choice of outcome variables, statistical summarization and analysis, and criteria for acceptance. Prominent dissenting views, with justifications for positions taken here, are also provided. Groundwork is laid for possible future guidelines addressing products for primary prevention or over-the-counter uses, or for determining superiority or equivalence of competing products. However, issues are identified which require further exploration before responsible and widely acceptable recommendations can be made in these areas. The guidelines suggested here are meant to form the basis of an evolving document rather than a static standard. It is suggested that they be reviewed frequently in the light of improvement in the technology available for periodontal research, and the emergence of products representing new approaches to periodontal therapy. C1 UNIV ILLINOIS,DEPT COMMUNITY HLTH,URBANA,IL 61801. UNIV ILLINOIS,DEPT STAT,URBANA,IL 61801. UNIV ILLINOIS,CTR RES ORAL MOLEC BIOL,URBANA,IL 61801. COLUMBIA UNIV,SCH DENT & ORAL SURG,NEW YORK,NY. COLUMBIA UNIV,DIV BIOSTAT,NEW YORK,NY. UNIV MINNESOTA,MINNESOTA CLIN DENT RES CTR,MINNEAPOLIS,MN 55455. EASTMAN DENT CTR,DIV BIOSTAT,ROCHESTER,NY. NIDR,EPIDEMIOL & ORAL DIS PREVENT PROGRAM,BETHESDA,MD 20892. UNIV PENN,DEPT PERIODONT,PHILADELPHIA,PA 19104. UNIV PENN,EPIDEMIOL SECT,PHILADELPHIA,PA 19104. UNIV TEXAS,MD ANDERSON CANC CTR,DEPT BIOMATH,HOUSTON,TX 77030. SUNY BUFFALO,DEPT PERIODONTOL,BUFFALO,NY. SUNY BUFFALO,DEPT ORAL MED,BUFFALO,NY. USN,DENT RES INST,GREAT LAKES,IL. BOSTON UNIV,DEPT MATH,BOSTON,MA 02215. VIRGINIA COMMONWEALTH UNIV,DEPT PERIODONT,RICHMOND,VA. FORSYTH DENT CTR,BOSTON,MA 02115. UNIV MISSOURI,DEPT PERIODONT,KANSAS CITY,MO 64110. UNIV FLORIDA,DEPT STAT,DIV BIOSTAT,GAINESVILLE,FL 32611. SUNY STONY BROOK,DEPT PREVENT MED,STONY BROOK,NY 11794. RP IMREY, PB (reprint author), UNIV ILLINOIS,DEPT MED INFORMAT SCI,URBANA,IL 61801, USA. OI Imrey, Peter/0000-0002-0533-4603 NR 18 TC 19 Z9 19 U1 0 U2 5 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0022-3484 J9 J PERIODONTAL RES JI J. Periodont. Res. PD SEP PY 1994 VL 29 IS 5 BP 348 EP 360 PG 13 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA PM489 UT WOS:A1994PM48900008 PM 7880252 ER PT J AU BOOTHKEWLEY, S VICKERS, RR AF BOOTHKEWLEY, S VICKERS, RR TI ASSOCIATIONS BETWEEN MAJOR DOMAINS OF PERSONALITY AND HEALTH BEHAVIOR SO JOURNAL OF PERSONALITY LA English DT Article ID 5-FACTOR MODEL; DRUG-USE; INVENTORY; DISEASE; SMOKING; TRAITS; RISK AB Broad personality traits may be important predictors of health behavior patterns. Two studies are reported which examined the associations between five major personality dimensions and four major health behavior dimensions. Prior associations between health behaviors and neurotic and extraverted personality tendencies generally were replicated. However, Conscientiousness and Agreeableness, two domains of personality that have received little research attention, emerged as important personality predictors of health behaviors. The results indicate that personality is a reliable predictor of health behavior patterns. It is suggested that the importance of personality has been underestimated in past research by the failure to consider appropriate health behavior criteria and the omission of important personality dimensions, such as Conscientiousness and Agreeableness, when studying health behavior patterns. C1 USN,HLTH RES CTR,DEPT COGNIT PERFORMANCE & PSYCHOPHYSIOL,SAN DIEGO,CA 92186. RP BOOTHKEWLEY, S (reprint author), USN,CTR PERSONNEL RES & DEV,WOMEN & MULTICULTURAL RES OFF,CODE 12,SAN DIEGO,CA 92152, USA. NR 46 TC 13 Z9 13 U1 3 U2 16 PU DUKE UNIV PRESS PI DURHAM PA BOX 90660, DURHAM, NC 27708-0660 SN 0022-3506 J9 J PERS JI J. Pers. PD SEP PY 1994 VL 62 IS 3 BP 282 EP 298 PG 17 WC Psychology, Social SC Psychology GA PM272 UT WOS:A1994PM27200001 ER PT J AU PAPOULIAS, FA RIEDEL, JS AF PAPOULIAS, FA RIEDEL, JS TI SOLUTION BRANCHING AND DIVE PLANE REVERSAL OF SUBMARINES AT LOW-SPEEDS SO JOURNAL OF SHIP RESEARCH LA English DT Article AB The problem of multiple steady-state solutions in the dive plane of submarines under depth control at low speeds is analyzed. This phenomenon occurs regardless of the particular means used for depth control, manual or automatic, and linear or nonlinear. It is shown that the primary bifurcation parameter is a Froude-like number based on the vehicle speed and metacentric height. Generic solution branching is shown to occur below a critical Froude number. Singularity theory techniques are employed to quantify the effects that various vehicle geometric properties and hydrodynamic characteristics have on steady-state motion. It is demonstrated that a comprehensive bifurcation study provides a systematic and effective way of predicting the phenomenon of dive plane reversal at low speeds. A complete characterization of the parameters in the problem, both in deep water and at periscope depth, is achieved through the organizing center of the pitchfork singularity. RP PAPOULIAS, FA (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0022-4502 J9 J SHIP RES JI J. Ship Res. PD SEP PY 1994 VL 38 IS 3 BP 203 EP 212 PG 10 WC Engineering, Marine; Engineering, Civil SC Engineering GA PG763 UT WOS:A1994PG76300004 ER PT J AU MOORE, FG WILCOX, F HYMER, T AF MOORE, FG WILCOX, F HYMER, T TI BASE DRAG PREDICTION ON MISSILE CONFIGURATIONS SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB New wind-tunnel data have been taken, and a new empirical model has been developed for predicting base drag on missile configurations. The new wind-tunnel data were taken at NASA Langley Research Center in the unitary wind tunnel at Mach numbers from 2.0 to 4.5, angles of attack to 16 deg, fin control deflections up to 20 deg, fin thickness-to-chord ratio of 0.05 to 0.15, and fin locations flush with the base to two chord lengths upstream of the base. The newly developed empirical model uses these data along with previous wind-tunnel data. It estimates base drag as a function of all the preceding variables along with boattail and power-on or power-off effects. In comparing the new empirical model to that used in the former aeroprediction code, the new model gives improved accuracy compared to wind-tunnel data. The new model also is more robust due to inclusion of additional variables. On the other hand, additional wind-tunnel data are needed to validate or modify the current empirical model in areas where data are not available. C1 NASA,LANGLEY RES CTR,HIGH SPEED AERODYNAM BRANCH,HAMPTON,VA 23665. RP MOORE, FG (reprint author), USN,CTR SURFACE WARFARE,DEPT WEAPONS SYST,DAHLGREN DIV,DAHLGREN,VA 22448, USA. NR 27 TC 5 Z9 5 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD SEP-OCT PY 1994 VL 31 IS 5 BP 759 EP 765 DI 10.2514/3.26509 PG 7 WC Engineering, Aerospace SC Engineering GA QA684 UT WOS:A1994QA68400007 ER PT J AU SMITH, EH HEBBAR, SK PLATZER, MF AF SMITH, EH HEBBAR, SK PLATZER, MF TI AERODYNAMIC CHARACTERISTICS OF A CANARD-CONTROLLED MISSILE AT HIGH ANGLES OF ATTACK SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB A low-speed wind-tunnel investigation was conducted to examine the aerodynamic characteristics of a one-third-scale model of a canard-controlled missile at high angles of attack using force and moment measurements. The data were taken at a nominal Mach number of 0.2 for angles of attack up to 50 deg at three different canard deflection settings. The test runs were limited to 0- and 45-deg missile roll angles (symmetric configurations) and two sets of tails (aft fins), one with the full area including the roll damping tabs (rollerons) and the other without the rollerons. The data indicate that the rollerons act as an effective fin area at low speeds and high angles of attack, and make the missile more stable. The test data were also used to validate the aerodynamic characteristics of tile missile as predicted by the Missile Datcom program. The agreement between the Datcom predictions and the test data is fairly good, with the latter indicating a slightly higher static stability. C1 USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943. RP SMITH, EH (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,CHINA LAKE,CA 93555, USA. NR 11 TC 8 Z9 8 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD SEP-OCT PY 1994 VL 31 IS 5 BP 766 EP 772 DI 10.2514/3.26510 PG 7 WC Engineering, Aerospace SC Engineering GA QA684 UT WOS:A1994QA68400008 ER PT J AU MOORE, FG HYMER, T MCINVILLE, R AF MOORE, FG HYMER, T MCINVILLE, R TI AN IMPROVED VERSION OF THE NAVAL-SURFACE-WARFARE-CENTER AEROPREDICTION CODE (AP93) SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article ID MISSILE AB A new and improved version of the Naval Surface Warfare Center, Dahlgren Division aeroprediction code has been developed. The new code, AP93, contains new technology that allows planar aerodynamics (Phi, = 0 roll and in plus fin orientation) of axisymmetric solid-rocket-type weapons to be computed over the entire Mach-number range that weapons ny and for angles of attack (AOAs) up to 30 deg. New technology developed and contained in the AP93 includes a new engineering method to compute aeroheating information at high Mach number; extension of the second-order shock-expansion theory to incorporate real-gas effects, including several new pressure prediction techniques; an improved body-alone nonlinear normal-force method; new methods for computing the nonlinear aerodynamics of wing-alone, wing-body, and body-wing effects due to AOA, and wing-body effects due to control deflection; and a new base-drag database and improved empirical base-drag estimation technique. Comparisons of the new AP93 code with the AP81 and experimental data have been made on many different configurations. In general, the comparisons show the AP93 on average reduces the normal force and center-of-pressure errors of the AP81 code about in half and gives a slight improvement in axial forte errors. C1 USN,CTR SURFACE WARFARE,AEROMECH BRANCH,DAHLGREN DIV,DAHLGREN,VA 22448. RP MOORE, FG (reprint author), USN,CTR SURFACE WARFARE,DEPT WEAPONS SYST,DAHLGREN DIV,DAHLGREN,VA 22448, USA. NR 27 TC 2 Z9 2 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD SEP-OCT PY 1994 VL 31 IS 5 BP 783 EP 791 DI 10.2514/3.26513 PG 9 WC Engineering, Aerospace SC Engineering GA QA684 UT WOS:A1994QA68400011 ER PT J AU PERDUE, PW KAZARIAN, KK NEVOLA, J LAW, WR WILLIAMS, T AF PERDUE, PW KAZARIAN, KK NEVOLA, J LAW, WR WILLIAMS, T TI THE USE OF LOCAL AND SYSTEMIC ANTIBIOTICS IN RAT FECAL PERITONITIS SO JOURNAL OF SURGICAL RESEARCH LA English DT Article ID HUMAN POLYMORPHONUCLEAR LEUKOCYTES; BACTERICIDAL ACTIVITY; LAVAGE; IRRIGATION; CAVITY; MACROPHAGES; EFFICACY; TOXICITY; WOUNDS AB Treatment of fecal peritonitis includes administration of antibiotics, physical removal of contaminants, and restoration of gastrointestinal integrity. The temporal relationship of parenteral antibiotics and peritoneal irrigation with varied antibiotic solutions was studied in a peritonitis model. Antibiotics in high concentrations may actually inhibit host immune cells; therefore, dilute solutions used were MIC (minimum inhibitory concentration) (micrograms per millimeter) equivalent to usually achieved standard therapeutic blood levels. Sprague-Dawley rats were given a quantitative intraperitoneal challenge of 2 x 10(10) CFU/kg Escherichia coli and 10 mg autoclaved rat feces. Rats were randomized to receive 30 mg/kg intramuscular ceftriaxone (CTRX) either at the time of challenge (T = 0) or 2 hr later (T = 2). Two hours after peritonitis, rats received peritoneal irrigation with 30 cc of (1) normal saline, (2) dilute (10 mg/liter) CTRX solution, or (3) concentrated (1000 mg/liter) CTRX solution or (4) no irrigation. Survival and intraperitoneal pathology were then assessed. Parenteral CTRX given concurrently with peritoneal contamination improved survival (67%) compared with parenteral administration given 2 hr later (33%) (P < 0.05). Intraperitoneal CTRX irrigation improved survival (100%) in animals that received parenteral CTRX concurrently with contamination; this beneficial effect was present with both dilute and concentrated solutions and was significantly better than saline irrigation alone. Parenteral antibiotics given early after contamination of the peritoneum associated later with peritoneal lavage with antibiotic solutions improved survival. (C) 1994 Academic Press, Inc. C1 USN,MED RES INST,SEPT SHOCK TREATMENT PROGRAM,BETHESDA,MD 20889. USN,MED RES INST,DEPT SURG,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. UNIV ILLINOIS,COLL MED,DEPT SURG,CHICAGO,IL 60612. NR 34 TC 18 Z9 19 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4804 J9 J SURG RES JI J. Surg. Res. PD SEP PY 1994 VL 57 IS 3 BP 360 EP 365 DI 10.1006/jsre.1994.1155 PG 6 WC Surgery SC Surgery GA PC505 UT WOS:A1994PC50500004 PM 8072283 ER PT J AU PHOTIADIS, DM BUCARO, JA CORSARO, RD AF PHOTIADIS, DM BUCARO, JA CORSARO, RD TI DOUBLE-LAYER ACTUATOR SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB This paper examines the potential for dual-layer actuators to achieve radiation efficiencies independent of the backing structure. It presents a simple center-of-mass representation for the device, and uses it to describe the kinematics of the dual layer actuator system with the purpose of identifying broad guidelines regarding thickness and frequency range issues. This approach has the advantage of providing a direct physical view of the device operation. In this context, it is shown that these devices work by electrically moving the center of mass of the transducer in opposition to the motion of the adjoining fluid. While such devices are shown to be generally less efficient than the simple parallel-driven double-layer transducer, over much of their operating range the loss in efficiency is found to be only a few decibels. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 3 TC 6 Z9 6 U1 0 U2 1 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 EI 1520-8524 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1994 VL 96 IS 3 BP 1613 EP 1619 DI 10.1121/1.410240 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PG307 UT WOS:A1994PG30700040 ER PT J AU BOGART, CW YANG, TC AF BOGART, CW YANG, TC TI SOURCE LOCALIZATION WITH HORIZONTAL ARRAYS IN SHALLOW-WATER - SPATIAL SAMPLING AND EFFECTIVE APERTURE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID RANGE-DEPENDENT ENVIRONMENT; MATCHED-FIELD; MARINE-SEDIMENTS; SOUND; MODE AB Using vertical line arrays, matched-field processing (MFP) range-depth localization performance in shallow water is often limited by poor sampling of bottom interacting acoustic modes. For off broadside sources, a horizontal array may offer improved mode sampling and localization performance. The relative performance of a horizontal array in mode sampling and localization defines its effective vertical aperture. The MFP performance of several horizontal line array apertures is investigated and compared to a full water column vertical array in a simulated range-independent shallow water environment. It is demonstrated that a horizontal array of sufficient length can equal or exceed the water column vertical array in range-depth localization performance. Expressions are also derived for mode decomposition factors that permit the direct comparison of horizontal and vertical array mode sampling performance. Horizontal array effective aperture can then be computed without the need of extensive MFP test runs. It is shown that the horizontal array effective apertures predicted by these decomposition factors correspond well to actual MFP localization performance for the scenarios considered in this paper. Thus the decomposition factors are a useful tool for array system design for shallow water MFP localization. RP BOGART, CW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 27 Z9 30 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1994 VL 96 IS 3 BP 1677 EP 1686 DI 10.1121/1.410247 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PG307 UT WOS:A1994PG30700048 ER PT J AU MAKRIS, NC INGENITO, F KUPERMAN, WA AF MAKRIS, NC INGENITO, F KUPERMAN, WA TI DETECTION OF A SUBMERGED OBJECT INSONIFIED BY SURFACE NOISE IN AN OCEAN WAVE-GUIDE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID AMBIENT NOISE AB A theory is developed and applied to determine whether an object submerged in an ocean waveguide and insonified only by surface-generated noise can be detected with conventional sensing arrays. An expression for the total noise-field covariance of a stratified waveguide with a submerged object present is derived using full-field wave theory. This is evaluated by numerical wave-number integration for a spherical object in a shallow water waveguide. The Cramer-Rao lower bound on detection error is computed for several realistic shallow water scenarios at both low and high frequency. The results indicate that cross-range localization is possible when the array aperture is sufficient to resolve the object scale. This conclusion is supported by beamforming simulations. Range localization is possible at greater distances. However, this requires high correlation between direct and scattered noise fields at the sensor, which is difficult to replicate via matched field processing. In addition, wave theory indicates that high resolution imaging of reflected ambient noise is generally most effective within the deep shadow range of the object. Beyond the deep shadow range, diffractive interference from the total forward field may overwhelm reflections, depending upon the incident noise directional spectrum and measurement range. Overall, present analysis indicates that the proposed detection scheme presses the limits of current technology. C1 SACLANT,UNDERSEA RES CTR,LA SPEZIA,ITALY. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. RP MAKRIS, NC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 35 Z9 43 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1994 VL 96 IS 3 BP 1703 EP 1724 DI 10.1121/1.410249 PG 22 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PG307 UT WOS:A1994PG30700050 ER PT J AU ORRIS, GJ COLLINS, MD AF ORRIS, GJ COLLINS, MD TI THE SPECTRAL PARABOLIC EQUATION AND 3-DIMENSIONAL BACKSCATTERING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OCEANIC WAVE-GUIDE; ACOUSTIC PROPAGATION; SCATTERING; MODEL AB Problems involving dependence of the acoustic parameters in depth and one of the horizontal Cartesian coordinates are solved using the cross-range wave-number spectrum and the parabolic equation (PE) method. The self-starter and the two-way PE are used to solve the two-dimensional wave equation that is obtained after transforming to wave-number space. Although the spectral PE solution breaks down for energy that propagates nearly parallel to the cross-range axis, it is accurate in other directions for both outgoing and backscattered energy. The spectral PE is practical for solving large-scale reverberation problems in three dimensions. RP ORRIS, GJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 27 TC 8 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1994 VL 96 IS 3 BP 1725 EP 1731 DI 10.1121/1.410250 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PG307 UT WOS:A1994PG30700051 ER PT J AU COLLINS, MD MAKRIS, NC FIALKOWSKI, LT AF COLLINS, MD MAKRIS, NC FIALKOWSKI, LT TI NOISE CANCELLATION AND SOURCE LOCALIZATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OCEAN AB A noise-canceling processor is developed for matched-field processing problems involving a signal buried in noise. This processor is based on modeling both signal and noise and searching the space of unknown parameters to achieve the best agreement between covariances. The noise-canceling processor reduces to the Bartlett processor in the limit of high signal-to-noise ratio. The examples illustrate the localization of a source obscured by interference from ambient noise or a second source. The noise-canceling processor is also applied to localize a silent object using scattered ambient noise. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1994 VL 96 IS 3 BP 1773 EP 1776 DI 10.1121/1.410255 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PG307 UT WOS:A1994PG30700057 ER PT J AU BUTLER, JL ROLT, KD TITO, FA AF BUTLER, JL ROLT, KD TITO, FA TI PIEZOELECTRIC CERAMIC MECHANICAL AND ELECTRICAL STRESS STUDY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB A study of published literature and information from piezoelectric ceramic vendors and underwater sound transducer designers has been undertaken to establish mechanical and electrical operating limits for transducers. It appears that operation up to 3.9-5.9 kV/cm (10-15 V/mil) rms and 69-103 MPa (10-15 kpsi) peak compression is achievable in practical sonar transducers. C1 USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320. RP BUTLER, JL (reprint author), IMAGE ACOUST INC,COHASSET,MA 02025, USA. NR 19 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1994 VL 96 IS 3 BP 1914 EP 1917 DI 10.1121/1.410205 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PG307 UT WOS:A1994PG30700074 ER PT J AU NAZERI, A KAHN, H BENDER, B ALLEN, C AF NAZERI, A KAHN, H BENDER, B ALLEN, C TI MICROSTRUCTURE OF KTAXNB1-XO3 THIN-FILMS ON MGO(100) SINGLE-CRYSTALS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID POTASSIUM-TANTALATE-NIOBATE; DEPOSITION AB Thin KTaxNb1-xO3 (KTN) films were prepared by deposition of sol-gel precursor solutions on MgO (100) single crystals. Crystal structure and microstructure of the films as a function of processing parameters, such as rate, duration, and temperature of postdeposition heat treatment, were studied. Several techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed to analyze the films. It was observed that slow heating of KTN films promotes pyrochlore formation while fast-firing of the films results in predominant formation of the perovskite phase. In slow-heated samples, TEM showed randomly oriented pyrochlore crystallites with a vermicular nanostructure of 10-30 nm with an interpenetrating porosity of the same range. In fast-fired samples, large perovskite pockets with pyrochlore crystallites scattered among them were seen. The large perovskite grains were on the order of 0.1-0.5 mu m, irregular in shape and porous. Transmission electron diffraction indicated these were single crystals, and ferroelectric domains were observed in them. Films of up to 1 mu m thick were obtained by multiple deposition of the sol-gel KTN. Dense films mere achieved when each layer was densified at 750 degrees C for 2 h before the next layer deposited. C1 LOCKHEED ENGN & SCI CO,HOUSTON,TX 77058. RP NAZERI, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 3 Z9 3 U1 1 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD SEP PY 1994 VL 77 IS 9 BP 2450 EP 2454 DI 10.1111/j.1151-2916.1994.tb04620.x PG 5 WC Materials Science, Ceramics SC Materials Science GA PH199 UT WOS:A1994PH19900031 ER PT J AU CAROME, MA KANG, YH BOHEN, EM NICHOLSON, DE CARR, FE YUAN, CM AF CAROME, MA KANG, YH BOHEN, EM NICHOLSON, DE CARR, FE YUAN, CM TI THE DISTRIBUTION OF RADIOLABELED PHOSPHOROTHIOATE OLIGONUCLEOTIDES (S-ODNS) WITHIN THE RAT-KIDNEY FOLLOWING INTRAVENOUS ADMINISTRATION SO JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY LA English DT Meeting Abstract C1 WALTER REED ARMY MED CTR,NEPHROL SERV,WASHINGTON,DC 20307. WALTER REED ARMY MED CTR,ENDOCRINE SERV,WASHINGTON,DC 20307. WALTER REED ARMY MED CTR,DEPT CLIN INVEST,WASHINGTON,DC 20307. USN,MED RES INST,DIV PATHOBIOL,BETHESDA,MD 20814. NR 0 TC 1 Z9 1 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1046-6673 J9 J AM SOC NEPHROL JI J. Am. Soc. Nephrol. PD SEP PY 1994 VL 5 IS 3 BP 618 EP 618 PG 1 WC Urology & Nephrology SC Urology & Nephrology GA PG771 UT WOS:A1994PG77101489 ER PT J AU MONTGOMERY, SR GALLAGHER, MP SALAMO, GJ SHARP, EJ WOOD, GL NEUROAONKAR, RR AF MONTGOMERY, SR GALLAGHER, MP SALAMO, GJ SHARP, EJ WOOD, GL NEUROAONKAR, RR TI COOPERATIVE PHOTOREFRACTIVE BEAM FANNING IN BASRKNANB5O(15) SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID SCATTERING; BATIO3 AB A multiline laser beam incident upon a BaSrKNaNb5O15 crystal causes rings to form in the beam fan by means of cooperative photorefractive fanning between the different wavelengths. We examine the novel case in which the input beam consists of two lines from an argon-ion laser with independently controlled linear polarizations as well as the single-line case with equal amounts of ordinary and extraordinary light. We compute the expected rings in each case, taking full account of the crystal birefringence, and compare them with the experimental data. Applications of the rings to crystallography and cryptology are presented. C1 UNIV ARKANSAS,DEPT PHYS,FAYETTEVILLE,AR 72701. USA,FT BELVOIR,VA 22060. ROCKWELL INT SCI CTR,THOUSAND OAKS,CA 91360. RP MONTGOMERY, SR (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD SEP PY 1994 VL 11 IS 9 BP 1694 EP 1699 DI 10.1364/JOSAB.11.001694 PG 6 WC Optics SC Optics GA PE853 UT WOS:A1994PE85300023 ER PT J AU WAX, JR SMITH, JF FLOYD, RC AF WAX, JR SMITH, JF FLOYD, RC TI LETHAL OSTEOGENESIS-IMPERFECTA - 2ND TRIMESTER SONOGRAPHIC DIAGNOSIS IN A TWIN GESTATION SO JOURNAL OF ULTRASOUND IN MEDICINE LA English DT Note ID OI TYPE-II; PRENATAL-DIAGNOSIS; GENETIC-HETEROGENEITY RP WAX, JR (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,DIV MATERNAL FETAL MED,PORTSMOUTH,VA 23708, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU AMER INST ULTRASOUND MEDICINE PI LAUREL PA SUBSCRIPTION DEPT, 14750 SWEITZER LANE, STE 100, LAUREL, MD 20707-5906 SN 0278-4297 J9 J ULTRAS MED JI J. Ultrasound Med. PD SEP PY 1994 VL 13 IS 9 BP 711 EP 713 PG 3 WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging GA PF132 UT WOS:A1994PF13200010 PM 7933048 ER PT J AU SINGER, IL AF SINGER, IL TI FRICTION AND ENERGY-DISSIPATION AT THE ATOMIC-SCALE - A REVIEW SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Review ID MOLECULAR-DYNAMICS; SLIDING FRICTION; DIAMOND SURFACES; FORCE MICROSCOPY; LIQUID-FILMS; MECHANISMS; MONOLAYERS; LAYERS; TIP AB Discussions of energy dissipation during friction processes have captured the attention of engineers and scientists for over 300 years. Why then do we know so little about either dissipation or friction processes? A simple answer is that we cannot see what is taking place at the interface during sliding. Recently, however, devices such as the atomic force microscope have been used to perform friction measurements, characterize contact conditions, and even describe the ''worn surface.'' Following these and other experimental developments, friction modeling at the atomic level-particularly molecular dynamics (MD) simulations-has brought scientists a step closer to ''seeing'' what takes place during sliding contact. With these investigations have come some answers and new questions about the modes and mechanisms of energy dissipation at the sliding interface. This article will review recent theoretical and experimental studies of friction processes at the atomic scale. Theoretical treatments range from simple, analytical models of two-dimensional, coupled ball-spring systems at 0 K, to more complex MD simulations of three-dimensional arrays of hydrogen- and hydrocarbon-terminated surfaces at finite temperatures. Results are presented for the simplest yet most practical cases of sliding contact: sliding without wear. Sliding without friction is seen in weakly interacting systems. Simple models can easily explain the energetics of such friction processes, but MD studies are needed to explore the dynamics (excitation modes, energy pathways,...) of thermally excited atoms interacting in three-dimensional fields. These studies provide the first atomic-scale models for anisotropic friction and boundary lubrication. Friction forces at atomic interfaces must ultimately be measured at the macroscopic level; these measurements, which depend on the mechanical properties of the measuring system, are discussed. Two rather unique experimental studies of friction are also reviewed. The first employs a ''surface force apparatus'' to measure adhesion and friction between surfactant monolayers. The correlation of adhesion hysteresis and friction provides a new mechanism of friction; moreover, the interpretation for the effect-hysteresis from entanglement of the molecular chains during a phase transformation-implies that the dynamics are taking place at an accessible time scale (seconds to minutes). The second study extends the time domain at which friction can be measured to the nanosecond scale. A quartz-crystal oscillator is used to monitor the viscosity of monolayer liquids and solids against solid surfaces. Interfaces slip angstroms in nanoseconds. Modelers have suggested a variety of mechanisms for this atomic-scale friction process, from defect-mediated sliding to electron drag effects. The article ends by identifying the vast, barely charted time-space domain (micro-to-pico time and length scales) in which experiments are needed to further understand the dynamic aspects of friction processes. RP SINGER, IL (reprint author), USN,RES LAB,CODE 6170,WASHINGTON,DC 20375, USA. NR 64 TC 92 Z9 94 U1 8 U2 70 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1994 VL 12 IS 5 BP 2605 EP 2616 DI 10.1116/1.579079 PG 12 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA PH791 UT WOS:A1994PH79100001 ER PT J AU BRIZZOLARA, RA BEARD, BC AF BRIZZOLARA, RA BEARD, BC TI CONTROL OF PURPLE MEMBRANE ADSORPTION TO A GLASS-SURFACE USING SELF-ASSEMBLED MONOLAYERS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT Topical Conference on Biomaterials Interfaces CY NOV 15-16, 1993 CL ORLANDO, FL SP AMER VACUUM SOC ID COPLANAR MOLECULAR ASSEMBLIES; BACTERIORHODOPSIN FILMS; HALOBACTERIUM-HALOBIUM; SOLID-SURFACES; PROTEIN; PHOTORECEPTOR; MODEL AB There is a considerable interest in the use of biological materials in electronic device applications. For example the purple membrane, a photoactive biological material, may have an application in artificial retinas. To fabricate devices such as artificial retinas from the purple membrane, a means of patterning the biological material on the substrate surface is needed. We have explored the use of self-assembled monolayers to achieve the control of the adsorption of the purple membrane to a glass surface. By changing the terminal group of the self-assembled monolayer, the affinity of the surface for the purple membrane is controlled. The adsorbed purple membrane films have been examined with x-ray photoelectron spectroscopy and fluorescence microscopy. The x-ray photoelectron spectroscopy data reveal that the purple membrane adsorbs to a clean glass surface in the amount 0.84 mug/cm2. Modifying the glass surface with a fluorocarbon-based self-assembled monolayer reduces the amount of purple membrane adsorbed by a factor of 9.3, to 0.09 mug/cm2. In the future, these results combined with one of the existing methods for patterning self-assembled monolayers, will provide a means of spatially controlling the adsorption of the purple membrane on a substrate. Thus, this work represents an important first step in the patterning of purple membrane structures and devices on a surface. RP BRIZZOLARA, RA (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 26 TC 10 Z9 10 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1994 VL 12 IS 5 BP 2981 EP 2987 DI 10.1116/1.578926 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA PH791 UT WOS:A1994PH79100065 ER PT J AU HSU, DSY AF HSU, DSY TI 10TH MICROMETER TRENCH FABRICATION BY APERTURE NARROWING OF 0.6-MU-M STARTING MASK STRUCTURES USING CHEMICAL-BEAM DEPOSITION AND ION-BEAM REDEPOSITION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Note ID SIDEWALL LITHOGRAPHY AB We demonstrated the proof of principle for the fabrication of trenches with widths down to 0.1 mu m on a silicon substrate using photolithographically prefabricated starting mask structures having a spacing of 0.6 mu m. The corresponding trench width of 0.15 mu m was achieved using starting mask structures having a spacing of 1.0 mu m. Chemical-beam deposition of metals was used to coat the starting mask structures and to narrow the aperture openings. Metal redeposition by ion-beam sputtering directed perpendicular to the substrate further narrowed the spacing between the sidewalls of the mask structures. The subsequent chemically assisted ion-beam etching of the underlying substrate through the constricted mask apertures produced the trenches with greatly reduced widths. RP HSU, DSY (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,CODE 6170,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD SEP-OCT PY 1994 VL 12 IS 5 BP 3048 EP 3053 DI 10.1116/1.587558 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PM724 UT WOS:A1994PM72400030 ER PT J AU DAVIES, MA RATNA, BR RUDOLPH, AS AF DAVIES, MA RATNA, BR RUDOLPH, AS TI STRUCTURAL AND THERMODYNAMIC INVESTIGATION OF FILAMENT FORMATION IN A DIACETYLENIC PHOSPHOLIPID SO LANGMUIR LA English DT Article ID LIPID BILAYERS; TUBULES; ORDER; CHAIN; MODES; PHOSPHATIDYLCHOLINES; MICROSTRUCTURES; ALKANES; SPECTRA AB Previous microscopic observations of the polymerizable, diacetylenic lipid 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine in ethanol/water solutions have revealed the formation of thin, undulating filaments upon cooling from 70 degrees C. Infrared spectroscopy and differential scanning calorimetry were used to investigate the phase characteristics of this lipid in mixtures of ethanol and water in order to describe the thermodynamics of filament formation in terms of specific structures. A calorimetric transition was observed at the;concentration of lipid at which filaments form (above 10 mg/mL) at approximately 53 degrees C. Infrared spectroscopy has revealed that the population of various gauche conformer classes, particularly (kink + gtg) and double gauche forms, decreased upon formation of filaments. Filaments are first microscopically observed near 45 degrees C and were stable for at least several hours. The maximum number. density of filaments was observed at between 38 and 40 degrees C at a lipid concentration of 20 mg/mL. Further cooling to 34 degrees C resulted in lipid precipitation and disappearance of the filaments. These results suggest the filaments form from an isotropic to fluid lamellar phase transition as the lipid is cooled in the ethanol/water solution. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP DAVIES, MA (reprint author), GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM & MOLEC BIOL,3900 RESERVOIR RD NW,WASHINGTON,DC 20007, USA. NR 25 TC 9 Z9 9 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD SEP PY 1994 VL 10 IS 9 BP 2872 EP 2876 DI 10.1021/la00021a007 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA PH964 UT WOS:A1994PH96400007 ER PT J AU PUVVADA, S QADRI, SB NACIRI, J RATNA, BR AF PUVVADA, S QADRI, SB NACIRI, J RATNA, BR TI EFFECT OF ACRYLAMIDE AND DODECANE ON THE PHASE-BEHAVIOR OF MONOOLEIN SO LANGMUIR LA English DT Article ID LYOTROPIC LIQUID-CRYSTALS; CUBIC PHASES; SYSTEMS; POLYMERIZATION; LAMELLAR AB Lipids when dissolved in water have been shown to self-assemble and form a broad spectrum of complex microstructures which include isotropic micellar and microemulsion phases and liquid crystalline lamellar, hexagonal, and bicontinuous cubic phases. The phase behavior of the monoolein-water system as a function of a polymerizable monomer (acrylamide) and an oil (dodecane) was studied. It is found that with increasing acrylamide concentration, the cubic phases of monoolein are destabilized and replaced by the lamellar phase. This effect was then reversed by adding dodecane to the system. The observed behavior is explained using the surfactant parameter alpha = v/al. It is found that acrylamide interacts with the monoolein head group and increases the head group area a (smaller alpha), while dodecane partitions between the hydrophobic tails and increases the values of v/l and alpha, thus reversing the effects of acrylamide. C1 USN, RES LAB, CTR BIOMOLEC SCI & ENGN, WASHINGTON, DC 20375 USA. UNIV COLORADO, DEPT CHEM & BIOCHEM, BOULDER, CO 80309 USA. NR 31 TC 6 Z9 6 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD SEP PY 1994 VL 10 IS 9 BP 2972 EP 2976 DI 10.1021/la00021a021 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA PH964 UT WOS:A1994PH96400021 ER PT J AU KOLOSKI, TS DULCEY, CS HARALSON, QJ CALVERT, JM AF KOLOSKI, TS DULCEY, CS HARALSON, QJ CALVERT, JM TI NUCLEOPHILIC DISPLACEMENT-REACTIONS AT BENZYL HALIDE SELF-ASSEMBLED MONOLAYER FILM SURFACES SO LANGMUIR LA English DT Article ID SELECTIVE ELECTROLESS METALLIZATION; COPLANAR MOLECULAR ASSEMBLIES; LITHOGRAPHY; LAYERS AB Surface chemical reactions at self-assembled monolayer (SAM) films containing benzyl halide functional groups have been investigated. The benzyl halide SAM films were chemisorbed onto silicon or silicon dioxide substrates. Nucleophilic substitution at the benzyl chloride group, employing NaI, results in exchange of chlorine for iodine. The rate for surface halogen exchange was compared to the rate in solution by H-1 NMR kinetics on a model compound. The rates and yields for reactions in which the benzyl halide is converted to ethylenediamine or 3-pyridine groups were studied by UV absorption spectroscopy and X-ray photoelectron spectroscopy. The utility of the benzyl halide SAM films as surface-imaging resists and the importance of the surface modifications in a lithographic process employing ligand-based selective metalization are also discussed. RP KOLOSKI, TS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 36 TC 32 Z9 32 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD SEP PY 1994 VL 10 IS 9 BP 3122 EP 3133 DI 10.1021/la00021a041 PG 12 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA PH964 UT WOS:A1994PH96400041 ER PT J AU RENEKER, MH AF RENEKER, MH TI SEEKING MEANING - A PROCESS APPROACH TO LIBRARY AND INFORMATION-SERVICES - KUHLTHAU,CC SO LIBRARY & INFORMATION SCIENCE RESEARCH LA English DT Book Review RP RENEKER, MH (reprint author), NAVAL POSTGRAD SCH,DUDLEY KNOX LIB,MONTEREY,CA 93943, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ABLEX PUBL CORP PI NORWOOD PA 355 CHESTNUT ST, NORWOOD, NJ 07648 SN 0740-8188 J9 LIBR INFORM SCI RES JI Libr. Infor. Sci. Res. PD FAL PY 1994 VL 16 IS 4 BP 346 EP 347 DI 10.1016/0740-8188(94)90060-4 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA QC162 UT WOS:A1994QC16200007 ER PT J AU CORY, DG MILLER, JB GARROWAY, AN AF CORY, DG MILLER, JB GARROWAY, AN TI CHEMICALLY RESOLVED SOLID-STATE NMR IMAGES OF POLYMERS SO MACROMOLECULAR SYMPOSIA LA English DT Article; Proceedings Paper CT NMR Symposia (covering Liquid NMR, Solid State NMR, and NMR Imaging of Polymeric Materials), at the 20th Meeting of the Federation-of-Analytical-Chemistry-and-Spectroscopy-Societies CY OCT 18-19, 1993 CL DETROIT, MI SP FEDERAT ANAL CHEM & SPECT SOC AB Polymers are generally spatially heterogeneous, either in terms of morphology or as blends of various components. Solid state NMR imaging provides a means of characterizing both the chemical/morphological composition and its spatial variation. Here we discuss multiple-pulse line-narrowing approaches to acquiring high resolution NMR images and how these sequences can be modified so as to be sensitive to the chemical composition of a sample. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 10 TC 4 Z9 4 U1 0 U2 0 PU HUTHIG & WEPF VERLAG PI BASEL PA AUF DEM WOLF 4 FX#001-41-61-317-94-11, CH-4052 BASEL, SWITZERLAND SN 1022-1360 J9 MACROMOL SYMP JI Macromol. Symp. PD SEP PY 1994 VL 86 BP 259 EP 269 DI 10.1002/masy.19940860120 PG 11 WC Polymer Science SC Polymer Science GA PP925 UT WOS:A1994PP92500019 ER PT J AU HEPP, MA MILLER, JB AF HEPP, MA MILLER, JB TI NMR IMAGING OF SOLID POLYMERS - STRATEGIES FOR CHEMICAL-SHIFT SELECTIVITY SO MACROMOLECULAR SYMPOSIA LA English DT Article; Proceedings Paper CT NMR Symposia (covering Liquid NMR, Solid State NMR, and NMR Imaging of Polymeric Materials), at the 20th Meeting of the Federation-of-Analytical-Chemistry-and-Spectroscopy-Societies CY OCT 18-19, 1993 CL DETROIT, MI SP FEDERAT ANAL CHEM & SPECT SOC ID FOURIER-TRANSFORM NMR; STATE NMR; MOLECULAR ORDER; PULSE SEQUENCE; MAGIC-ECHO; EXCITATION; IMAGES; C-13 AB One reason that the solid-state imaging field is exciting is because of its potential to provide spatially resolved chemical information from deep inside a solid sample. To achieve this goal, methods are needed which exploit the many NMR parameters to generate image contrast. We describe two strategies for employing the chemical-shift anisotropy as a contrast mechanism in images of abundant nuclei in solid polymers. We illustrate these approaches with images which map spatial variations of molecular orientation in samples of polytetrafluoroethylene. RP HEPP, MA (reprint author), USN,RES LAB,DIV CHEM,CODE 6122,WASHINGTON,DC 20375, USA. NR 42 TC 4 Z9 4 U1 0 U2 0 PU HUTHIG & WEPF VERLAG PI BASEL PA AUF DEM WOLF 4 FX#001-41-61-317-94-11, CH-4052 BASEL, SWITZERLAND SN 1022-1360 J9 MACROMOL SYMP JI Macromol. Symp. PD SEP PY 1994 VL 86 BP 271 EP 282 DI 10.1002/masy.19940860121 PG 12 WC Polymer Science SC Polymer Science GA PP925 UT WOS:A1994PP92500020 ER PT J AU WAYMAN, CM AARONSON, HI HIRTH, JP RATH, BB AF WAYMAN, CM AARONSON, HI HIRTH, JP RATH, BB TI PROCEEDINGS OF THE PACIFIC RIM CONFERENCE ON THE ROLES OF SHEAR AND DIFFUSION IN THE FORMATION OF PLATE-SHAPED TRANSFORMATION PRODUCTS - FOREWORD SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Editorial Material C1 USN,RES LAB,GEO CTR INC,WASHINGTON,DC 20375. WASHINGTON STATE UNIV,PULLMAN,WA 99164. RP WAYMAN, CM (reprint author), UNIV ILLINOIS,URBANA,IL 61801, USA. NR 0 TC 1 Z9 2 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD SEP PY 1994 VL 25 IS 9 BP 1785 EP 1786 PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PC476 UT WOS:A1994PC47600001 ER PT J AU AARONSON, HI HALL, MG AF AARONSON, HI HALL, MG TI HISTORY OF THE CONTROVERSY OVER THE ROLES OF SHEAR AND DIFFUSION IN PLATE FORMATION ABOUT MD AND A COMPARISON OF THE ATOMIC MECHANISMS OF THESE PROCESSES SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Pacific Rim Conference on the Role of Shear and Diffusion in the Formation of Plate-Shaped Transformation Products CY DEC 18-22, 1992 CL KONA, HI SP ASM INT, PHASE TRANSFORMAT COMM ID LEDGED INTERPHASE BOUNDARIES; FCC-BCC BOUNDARIES; PERCENT CR ALLOY; TRANSMISSION ELECTRON-MICROSCOPY; PROEUTECTOID ALPHA-PLATES; BETA-VANADIUM HYDRIDE; AUCU-II PLATES; AL-AG SYSTEM; GROWTH-KINETICS; PHASE-TRANSFORMATIONS AB The evolution of the controversy over the roles played by shear and by diffusion in the formation of plate-shaped transformation products above M(d) is traced along its principal pathways. Growth by shear is taken to occur through the glide of dislocations, whereas diffusional growth is considered to occur by means of the biased random walk of individual atoms. Both mechanisms are based upon growth ledges, but during shear, risers, and in some cases terraces, are mobile in non-fcc/hcp transformations; however, during diffusional growth, only the risers (and more likely, only kinks on the risers) are mobile when there is a stacking sequence difference across the terrace of a growth ledge. The aura of the powerful and elegant phenomenological theory of martensite crystallography (PTMC) appears to have persuaded many researchers that even above M(d), plates usually form by shear because one or more of the multiple requirements for the applicability of the PTMC appears to be fulfilled. As the preceding article by Wayman in these conference proceedings emphasizes, however, all of these requirements must be fulfilled in a self-consistent manner if a plate is to qualify as the product of a shear transformation mechanism. Successful application of the invariant line (IL) component of the PTMC to precipitate plates and needles or rods by Dahmen and co-workers provides a phenomenological reason why the crystallographies and surface reliefs of ledgewise shear and ledgewise diffusional growth sometimes appear to be identical. While the IL-containing broad faces of a martensite plate minimize the transformation strain energy, the same situation in plates formed by ledgewise diffusional growth tentatively appears to engender a minimum in the kinetics of growth ledge generation and/or the lateral growth kinetics of such ledges. C1 USN,RES LAB,PHYS MET BRANCH,CODE 6320,WASHINGTON,DC 20375. UNIV BIRMINGHAM,SCH MET & MAT,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. RP AARONSON, HI (reprint author), GEOCENTERS INC,FT WASHINGTON,MD, USA. NR 237 TC 42 Z9 43 U1 1 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD SEP PY 1994 VL 25 IS 9 BP 1797 EP 1819 DI 10.1007/BF02649030 PG 23 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PC476 UT WOS:A1994PC47600003 ER PT J AU HALL, MG AARONSON, HI AF HALL, MG AARONSON, HI TI FORMATION OF INVARIANT PLANE-STRAIN AND TENT-SHAPED SURFACE RELIEFS BY THE DIFFUSIONAL LEDGE MECHANISM SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Pacific Rim Conference on the Role of Shear and Diffusion in the Formation of Plate-Shaped Transformation Products CY DEC 18-22, 1992 CL KONA, HI SP ASM INT, PHASE TRANSFORMAT COMM ID RELIEF; PLATES; CRYSTALLOGRAPHY; TRANSFORMATIONS; KINETICS; FERRITE; STEELS AB Electron channeling contrast and electron backscattering patterns (EBSPs), generated in scanning electron microscopes (SEMs), were used to study the question of whether tent-shaped surface reliefs associated with ferrite plates in Fe-0.07 pct and Fe-0.50 pct C low-alloy steels are single crystals or back-to-back pairs of plates. Although more than 50 ferrite plates were examined in detail, any misorientation contained within them must have been < 1 deg. Additionally, no sightings of the low-angle grain boundaries approximately bisecting ferrite plates expected on the back-to-back plates mechanism were ever made. The efforts of previous investigators to explain tent-shaped (and invariant plane-strain) reliefs on the basis of diffusional ledgewise growth were further extended. C1 GEOCENTERS INC,FT WASHINGTON,MD. USN,RES LAB,PHYS MET BRANCH,CODE 6320,WASHINGTON,DC 20375. RP HALL, MG (reprint author), UNIV BIRMINGHAM,SCH MET & MAT,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. RI LAI, JING/F-6526-2010 NR 37 TC 38 Z9 38 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD SEP PY 1994 VL 25 IS 9 BP 1923 EP 1931 DI 10.1007/BF02649040 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PC476 UT WOS:A1994PC47600013 ER PT J AU SPANOS, G AF SPANOS, G TI THE FINE-STRUCTURE AND FORMATION MECHANISM OF LOWER BAINITE SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Pacific Rim Conference on the Role of Shear and Diffusion in the Formation of Plate-Shaped Transformation Products CY DEC 18-22, 1992 CL KONA, HI SP ASM INT, PHASE TRANSFORMAT COMM ID HYPEREUTECTOID STEELS; TRANSFORMATION; PRECIPITATION; SILICON; MIDRIB; PLATES AB Isothermal transformation of austenite to lower bainite was studied by optical microscopy and transmission electron microscopy (TEM), in two high-purity Fe-C-4 wt pct Mn-2 wt pct Si alloys containing 0.4 and 0.6 wt pct carbon, in order to elucidate the fine structure and formation mechanism of lower bainite. The present results support a mechanism for lower bainite formation presented previously in which lower bainite sheaves result from the formation of an aggregate of fine ferrite crystals with thin austenite ''gaps'' between them; carbide precipitation occurs within these austenite gaps. This mechanism accounts for the carbides oriented at an angle to the sheaf axis repeatedly observed in lower bainite but is inconsistent with models based on the precipitation of a high-volume fraction of carbides within highly supersaturated ferrite formed by high-velocity shear. Observations by a number of other researchers are reviewed and shown to include morphological features consistent with the present mechanism. Finally, the orientation relationships typically observed among fenite, austenite, and carbides in lower bainite are reviewed and shown in most (but not all) cases to be consistent with the view that carbides precipitate in austenite at ferrite-austenite boundaries, also in agreement with the present model. RP SPANOS, G (reprint author), USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375, USA. NR 56 TC 13 Z9 13 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD SEP PY 1994 VL 25 IS 9 BP 1967 EP 1980 DI 10.1007/BF02649045 PG 14 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PC476 UT WOS:A1994PC47600018 ER PT J AU BLOOD, CG ANDERSON, ME AF BLOOD, CG ANDERSON, ME TI THE BATTLE FOR HUE - CASUALTY AND DISEASE RATES DURING URBAN WARFARE SO MILITARY MEDICINE LA English DT Article AB Renewed nationalism with the ending of the Cold War has precipitated numerous conflicts between regions or countries that were formerly united. Hostilities between some ethnic and nationalistic factions have reached the point where regional security is threatened and United Nations-sanctioned military operations may be required. Because some U.N. operations could require the forcible removal of an entrenched faction from an urban setting, the present investigation seeks to determine the levels of medical casualties that might be sustained during urban warfare. Casualty rates and illness incidence were examined for U.S. Marine forces participating in the retaking of the city of Hue during the Tet offensive in 1968. The casualty rates were analyzed for different phases of the urban assault and contrasted with a different period of the Vietnam Conflict, and with the high intensity battle for Okinawa during World War II. Rates of casualties during the retaking of Hue were highest during the two phases of the operation that required close-quarter fighting. The house-to-house fighting south of the river yielded a wounded rate of 37.9 per 1,000 strength per day, while the fighting in the inner city yielded a rate of 44.4. Rate of wounded during the ''mopping-up'' phase was 5.8. The rate of illness incidence was stable over the month-long operation and showed no concomitant increase with battle intensity.'' RP BLOOD, CG (reprint author), USN,HLTH RES CTR,MED INFORMAT SYST & OPERAT RES DEPT,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 9 Z9 11 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD SEP PY 1994 VL 159 IS 9 BP 590 EP 595 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA PQ205 UT WOS:A1994PQ20500002 PM 7800172 ER PT J AU GUIDA, RA AF GUIDA, RA TI ENVIRONMENTAL COMPLIANCE IN THE NAVY SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper explores the application of environmental requirements to Navy work, especially work that involves warships. Because environmental laws confer considerable authority on state and local agencies, whenever Navy warships transit from one locality to another, they face different regulatory regimes that are often inconsistent in the standards applied. Such diversity can present serious problems, especially concerning the many different water-borne discharges made by Navy vessels. This paper examines how the Navy should deal with such regulatory circumstances to avoid disruption and unnecessary expense. The paper also suggests a role for the naval engineer in Navy efforts to sensibly comply with regulatory requirements that apply to Navy warships. RP GUIDA, RA (reprint author), USN,SEA SYST COMMAND,NUCL PROPULS PROGRAM,2531 NATL CTR,BLDG 3,WASHINGTON,DC 20362, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1994 VL 106 IS 5 BP 60 EP 67 PG 8 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RB918 UT WOS:A1994RB91800005 ER PT J AU MARKLEY, TB AF MARKLEY, TB TI NAVY NIGHT-VISION ELECTROOPTICS ON THE THRESHOLD SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Navy Night Vision/Electro-Optics (NVEO) could be on the threshold of major changes. Recent events and the changing world order are causing most defense organizations to speculate about the future. Navy NVEO is not immune to this type of reflection. Conjecture of this nature in NVEO is rooted in the available technology and the evolving Navy mission. RP MARKLEY, TB (reprint author), USN,NIGHT VIS PROGRAM OFF,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1994 VL 106 IS 5 BP 73 EP 78 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RB918 UT WOS:A1994RB91800007 ER PT J AU STRICKER, JG BECNEL, AJ PURNELL, JG AF STRICKER, JG BECNEL, AJ PURNELL, JG TI ADVANCED WATERJET SYSTEMS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Several advanced waterjet systems have recently been developed for Marine Corps applications. In developing propulsor technology for the Advanced Amphibious Assault Vehicle (AAAV) program, a compact system was designed to meet specified thrust, speed, and envelope requirements of a baseline planing vehicle configuration. A second propulsor design was completed to meet requirements of a revised vehicle. Concurrently design studies of an outboard motor-fitted pumpjet concept were undertaken for the MARS system development program, and modified components were designed and manufactured as part of an effort to improve performance of the commercially-developed pumpjet units. Optimization procedures, detailed designs, and available performance data are discussed for each of these applications. In addition, new waterjet design concepts aiming toward improved thrust and efficiency for planing craft applications are discussed. RP STRICKER, JG (reprint author), USN,SURFACE WARFARE COMMAND,DEPT PROPULS & AUXILIARY SYST,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1994 VL 106 IS 5 BP 100 EP 109 PG 10 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RB918 UT WOS:A1994RB91800010 ER PT J AU HOLLOWAY, JL AF HOLLOWAY, JL TI THE BATTLE OF SURIGAO STRAITS - AN ADDRESS BY ADMIRAL HOLLOWAY,JAMES,L. III, USN (RET) AT THE WORLD-WAR-II-IN-THE-PACIFIC CONFERENCE SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material C1 USN,WASHINGTON,DC 20350. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1994 VL 106 IS 5 BP 110 EP 114 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RB918 UT WOS:A1994RB91800011 ER PT J AU KROEGER, RA INDERHEES, SE JOHNSON, WN KINZER, RL KURFESS, JD GEHRELS, N AF KROEGER, RA INDERHEES, SE JOHNSON, WN KINZER, RL KURFESS, JD GEHRELS, N TI CHARGE DIVISION READOUT OF A 2-DIMENSIONAL GERMANIUM STRIP DETECTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 3rd London Conference on Position Sensitive Detectors CY SEP 06-10, 1993 CL BRUNEL UNIV, LONDON, ENGLAND HO BRUNEL UNIV ID RADIATION AB Germanium strip detectors combine superior spectroscopy typical of germanium detectors with good spatial resolution. Our work has been to develop a 2-dimensional position readout of a 5 x 5 strip X-Y detector. The prototype device uses two capacitive charge division strings. Each string is read out by two 13-bit ADCs, one on each end of the string. The four data channels are stored as an event list for subsequent processing. We form a response map over the detector surface in order to locate the position of each interaction with the spatial resolution of the strip pitch, in our case 9 mm. Cross-talk and non-linearities are removed using the response map. Energy resolution of 5-6 keV FWHM is achieved between 60 and 662 keV across the full surface of the detector. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP KROEGER, RA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Gehrels, Neil/D-2971-2012; Johnson, Neil/G-3309-2014 NR 10 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD SEP 1 PY 1994 VL 348 IS 2-3 BP 507 EP 509 DI 10.1016/0168-9002(94)90789-7 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PF645 UT WOS:A1994PF64500059 ER PT J AU BLANCO, TA HILLERY, RC AF BLANCO, TA HILLERY, RC TI A SEA STORY - IMPLEMENTING THE NAVY PERSONNEL ASSIGNMENT SYSTEM SO OPERATIONS RESEARCH LA English DT Article ID OPERATIONS-RESEARCH; PLANNING SYSTEM; CHANGING-ROLE; SCALE AB During its operational test and evaluation, despite top management support and significant technical achievements, a personnel assignment model implemented for the United States Navy to support assignment decisions experienced overwhelming resistance from the users, the 200 or so enlisted detailers, located at the Bureau of Naval Personnel in Washington, D.C. Our MS/OR research team had neglected to assess the negative impact of the personnel assignment model on an important detailing function: assignment negotiations or bargaining between the detailers and their customers, the service members. By involving the detailers in revising the model and making the failings of the old model the strengths of the new model, we turned certain failure into a successful program. By managing the behavioral aspects of the implementation with special emphasis on problem identification and requirements structuring, we overcame the difficulties of introducing change to a largely manual and highly decentralized decision process and we compare lessons learned with the experiences of other implementers. C1 US BUR NAVAL PERSONNEL,WASHINGTON,DC. RP BLANCO, TA (reprint author), USN,CTR PERSONNEL RES & DEV,DIV ASSIGNMENT SYST,SAN DIEGO,CA 92132, USA. RI Reeves, Maiyuwai/F-1004-2011 NR 34 TC 10 Z9 10 U1 1 U2 7 PU OPERATIONS RESEARCH SOC AMER PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2920 SN 0030-364X J9 OPER RES JI Oper. Res. PD SEP-OCT PY 1994 VL 42 IS 5 BP 814 EP 822 DI 10.1287/opre.42.5.814 PG 9 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA PN144 UT WOS:A1994PN14400002 ER PT J AU PACE, PE FOSTER, CC AF PACE, PE FOSTER, CC TI BEAM-PROPAGATION ANALYSIS OF A PARALLEL CONFIGURATION OF MACH-ZEHNDER INTERFEROMETERS SO OPTICAL ENGINEERING LA English DT Article DE MACH-ZEHNDER INTERFEROMETERS; PARALLEL PROCESSING; BEAM PROPAGATION ANALYSIS ID WAVE-GUIDES; COUPLERS; FIBERS AB Using the beam propagation method of analysis, the performance of a parallel configuration of integrated optical Mach-Zehnder interferometers is examined. These configurations require the interferometers to be spaced closely together to limit the length of the substrate. As a result, the leakage or substrate radiation modes that exist outside each interferometer extend to the point where interference with adjacent substrate radiation modes (and, hence, guided optical power in close proximity) occurs. The radiation mode coupling is shown to have a significant effect on the performance of the interferometer array. The induced change in the mode propagation constants (Delta beta) and the corresponding insertion loss due to the radiation mode interference are evaluated numerically as a function of the separation distance between the interferometers. Distortion in the modulation characteristics due to the radiation mode coupling is also quantified and compared with the theoretically expected values. RP PACE, PE (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,833 DYER RD,ROOM 437,MONTEREY,CA 93943, USA. NR 16 TC 1 Z9 1 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1994 VL 33 IS 9 BP 2911 EP 2921 DI 10.1117/12.179357 PG 11 WC Optics SC Optics GA PF664 UT WOS:A1994PF66400017 ER PT J AU ROSENFELD, P EDWARDS, JE AF ROSENFELD, P EDWARDS, JE TI AUTOMATED-SYSTEM ASSESSES EQUAL-OPPORTUNITY SO PERSONNEL JOURNAL LA English DT Article RP ROSENFELD, P (reprint author), USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92132, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACC COMMUNICATIONS INC PI COSTA MESA PA 245 FISCHER AVE, COSTA MESA, CA 92626 SN 0031-5745 J9 PERS J JI Pers. J. PD SEP PY 1994 VL 73 IS 9 BP 98 EP & PG 0 WC Psychology, Applied SC Psychology GA PE513 UT WOS:A1994PE51300012 ER PT J AU STIXRUDE, L COHEN, RE SINGH, DJ AF STIXRUDE, L COHEN, RE SINGH, DJ TI IRON AT HIGH-PRESSURE - LINEARIZED-AUGMENTED-PLANE-WAVE COMPUTATIONS IN THE GENERALIZED-GRADIENT APPROXIMATION SO PHYSICAL REVIEW B LA English DT Note ID GROUND-STATE PROPERTIES; CORRECTED DENSITY FUNCTIONALS; EARTH CORE CONDITIONS; EXCHANGE-CORRELATION; BRILLOUIN-ZONE; ELECTRONIC-PROPERTIES; CORRELATION-ENERGY; SPECIAL POINTS; INNER-CORE; SOLIDS AB General potential linearized-augmented-plane-wave computations using the generalized-gradient approximation (GGA) of Perdew and Wang (PW-II) show excellent agreement with the measured equations of state of bcc and hcp phases to over 300 GPa, the bcc to hcp phase transition pressure, and the bcc magnetic moment. The results are a significant improvement over the local-spin-density approximation and the earlier PW-1 GGA functional. The bcc phase is mechanically unstable at high pressure with respect to a tetragonal strain, and is thus unlikely to exist in the earth's inner core. C1 CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. CARNEGIE INST WASHINGTON,CTR HIGH PRESSURE RES,WASHINGTON,DC 20015. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP STIXRUDE, L (reprint author), GEORGIA INST TECHNOL,SCH EARTH & ATMOSPHER SCI,ATLANTA,GA 30332, USA. RI Cohen, Ronald/B-3784-2010; Stixrude, Lars/C-5625-2012; Singh, David/I-2416-2012 OI Cohen, Ronald/0000-0001-5871-2359; Stixrude, Lars/0000-0003-3778-2432; NR 42 TC 193 Z9 195 U1 1 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1994 VL 50 IS 9 BP 6442 EP 6445 DI 10.1103/PhysRevB.50.6442 PG 4 WC Physics, Condensed Matter SC Physics GA PG285 UT WOS:A1994PG28500077 ER PT J AU DEPPE, J FELDMAN, JL AF DEPPE, J FELDMAN, JL TI ENERGY CURRENT AND THERMAL-CONDUCTIVITY FOR JOSEPHSON-JUNCTION ARRAY MODELS OF GRANULAR SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID MOLECULAR-DYNAMICS; AMORPHOUS-SILICON; GLASSES; TC AB One model of granular superconductors is based on a Josephson-junction array with capacitive, or charging, terms. As a result of having these noncommuting terms in the Hamiltonian, energy transport is possible. We have obtained an expression for the heat current for this model and have employed it in calculating the thermal conductivity kappa. We find that as the temperature is lowered through the system's order-disorder phase transition, kappa increases by more than one order of magnitude. Effects of having a distribution of grain sizes are also calculated. RP DEPPE, J (reprint author), USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. NR 26 TC 3 Z9 3 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1994 VL 50 IS 9 BP 6479 EP 6482 DI 10.1103/PhysRevB.50.6479 PG 4 WC Physics, Condensed Matter SC Physics GA PG285 UT WOS:A1994PG28500087 ER PT J AU SINGH, DJ AF SINGH, DJ TI LAPT2B2C - A CONVENTIONAL BOROCARBIDE SUPERCONDUCTOR SO PHYSICAL REVIEW B LA English DT Note ID BRILLOUIN-ZONE AB Local-density-approximation electronic-structure calculations for the recently discovered LaPt2B2C superconductor are reported. The calculations show, as in LuNi2B2C, that despite the quasi-two-dimensional crystal structure, the electronic structure in the vicinity of the Fermi energy (E(F)) is quite three dimensional, with substantial contributions from all atoms. In this compound, E(F) falls on the low-energy side of a peak in the electronic density of states, suggesting that T(c) may be increased by doping to a higher electron count. The value of the density of states at E(F) is found to be substantially smaller than that of LuNi2B2C in agreement with experiment. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 15 TC 20 Z9 20 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1994 VL 50 IS 9 BP 6486 EP 6488 DI 10.1103/PhysRevB.50.6486 PG 3 WC Physics, Condensed Matter SC Physics GA PG285 UT WOS:A1994PG28500089 ER PT J AU HEAGY, JF CARROLL, TL PECORA, LM AF HEAGY, JF CARROLL, TL PECORA, LM TI SYNCHRONOUS CHAOS IN COUPLED OSCILLATOR-SYSTEMS SO PHYSICAL REVIEW E LA English DT Article ID NONLINEAR OSCILLATORS; CHEMICAL OSCILLATORS; JOSEPHSON-JUNCTIONS; SYNCHRONIZATION; ARRAYS; STABILITY; PHASE; DYNAMICS; BIFURCATIONS; POPULATIONS AB We investigate the synchronization of chaotic oscillations in coupled oscillator systems, both theoretically and in analog electronic circuits. Particular attention is paid to deriving and testing general conditions for the stability of synchronous chaotic behavior in cases where the coupled oscillator array possesses a shift-invariant symmetry. These cases include the well studied cases of nearest-neighbor diffusive coupling and all-to-all or global coupling. An approximate criterion is developed to predict the stability of synchronous chaotic oscillations in the strong coupling limit, when the oscillators are coupled through a single coordinate (scalar coupling). This stability criterion is illustrated numerically in a set of coupled Rossler-like oscillators. Synchronization experiments with coupled Rossler-like oscillator circuits are also carried out to demonstrate the applicability of the theory to real systems. RP USN, RES LAB, DIV MAT SCI, WASHINGTON, DC 20375 USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 67 TC 386 Z9 389 U1 1 U2 18 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD SEP PY 1994 VL 50 IS 3 BP 1874 EP 1885 DI 10.1103/PhysRevE.50.1874 PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PJ443 UT WOS:A1994PJ44300019 ER PT J AU WHITNEY, KG THORNHILL, JW GIULIANI, JL DAVIS, J MILES, LA NOLTING, EE KENYON, VL SPEICER, WA DRAPER, JA PARSONS, CR DANG, P SPIELMAN, RB NASH, TJ MCGURN, JS RUGGLES, LE DEENEY, C PRASAD, RR WARREN, L AF WHITNEY, KG THORNHILL, JW GIULIANI, JL DAVIS, J MILES, LA NOLTING, EE KENYON, VL SPEICER, WA DRAPER, JA PARSONS, CR DANG, P SPIELMAN, RB NASH, TJ MCGURN, JS RUGGLES, LE DEENEY, C PRASAD, RR WARREN, L TI OPTIMIZATION OF K-SHELL EMISSION IN ALUMINUM Z-PINCH IMPLOSIONS - THEORY VERSUS EXPERIMENT SO PHYSICAL REVIEW E LA English DT Article ID X-RAY-EMISSION; ARRAY IMPLOSIONS AB Two sets of z-pinch experiments were recently completed at the Saturn and Phoenix facilities of Sandia National Laboratories and the Naval Surface Warfare Center, respectively, using aluminum wire arrays of different wire and array diameters. Measurements of the total x-ray yield from the K shell of aluminum were made. In this paper, a comparison of these measurements is made to both theoretical predictions and to a similar set of earlier measurements that were made at the Double Eagle facility of Physics International Company, These three sets of yield measurements have points of agreement with predicted yields and with each other, but they also show points of mutual disagreement, whose significance is discussed. The data are analyzed using a slightly revised version of a previously published K-shell yield scaling law, and they support the existence of a reasonably well defined region in (load mass)-(implosion velocity) space in which plasma kinetic energy is efficiently converted into K-shell x rays. Furthermore, a correlation is observed between the inferred conversion efficiencies and the times in which the implosions occur relative to the times when each generator's short-circuit current reaches its peak value. Finally, unlike the Double Eagle experiments, the largest measured yields in the new experiments were observed to occur at the upper velocity boundary of the efficient emission region. Moreover, the observed yields are in fairly good quantitative agreement with an earlier scaling law prediction of the maximum K-shell x-ray yield from aluminum as a function of load mass assuming kinetic energy conversion alone. C1 USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. PHYS INT CO,SAN LEANDRO,CA 94577. RP WHITNEY, KG (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 13 TC 50 Z9 50 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD SEP PY 1994 VL 50 IS 3 BP 2166 EP 2174 DI 10.1103/PhysRevE.50.2166 PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PJ443 UT WOS:A1994PJ44300052 ER PT J AU BERNARD, PS ROVELSTAD, AL AF BERNARD, PS ROVELSTAD, AL TI ON THE PHYSICAL ACCURACY OF SCALAR TRANSPORT MODELING IN INHOMOGENEOUS TURBULENCE SO PHYSICS OF FLUIDS LA English DT Article ID PASSIVE-SCALAR; REYNOLDS STRESS; CHANNEL FLOW; SHEAR FLOWS; DIFFUSION; DISPERSION; SIMULATION; CANOPIES; LAYERS AB Direct numerical simulations of scalar fields produced by uniform and line sources in channel flow are used as the basis for examining the accuracy of random flight and closure models in predicting turbulent scalar transport rates. Closure models of gradient form with an anisotropic eddy diffusivity tenser perform well for the uniform source flow and the far field of plumes. In the near field, the plumes are seriously distorted due to the inappropriateness of gradient transport in modeling the streamwise flux rate. Random flight models are most successful in producing a qualitative rendering of the near field of plumes, but are subject to significant quantitative inaccuracies for the low Reynolds and Schmidt number flows considered here. Ensembles of particle paths having common end points are used to explore the physics of the scalar transport correlation. For plume flows, transport in the near field is found to be primarily due to the average effect of the meandering of the turbulent fluid over the source, in which the amount of scalar dispersed by a fluid particle correlates with the local velocity fluctuation. Farther downstream, displacement transport-which may be reasonably modeled via gradient physics-emerges as the principal mechanism behind the scalar flux. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BERNARD, PS (reprint author), UNIV MARYLAND,DEPT MECH ENGN,COLLEGE PK,MD 20742, USA. NR 33 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD SEP PY 1994 VL 6 IS 9 BP 3093 EP 3108 DI 10.1063/1.868134 PG 16 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA PF980 UT WOS:A1994PF98000036 ER PT J AU GORSKI, JJ WALLACE, JM BERNARD, PS AF GORSKI, JJ WALLACE, JM BERNARD, PS TI THE ENSTROPHY EQUATION BUDGET OF BOUNDED TURBULENT SHEAR FLOWS SO PHYSICS OF FLUIDS LA English DT Note ID VORTICITY VECTOR-FIELDS; VELOCITY; LAYER AB The turbulent enstrophy equation budget for a fully developed two-dimensional channel flow computed from a direct numerical simulation is compared to that for a flat plate boundary layer flow obtained experimentally. A close agreement is found between the comparable terms in the enstrophy equation suggesting that there probably is common behavior for the enstrophy budget in wall bounded flows. C1 UNIV MARYLAND, DEPT MECH ENGN, COLLEGE PK, MD 20742 USA. RP USN, CTR SURFACE WARFARE, CARDEROCK DIV, BETHESDA, MD 20084 USA. NR 10 TC 8 Z9 8 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-6631 EI 1089-7666 J9 PHYS FLUIDS JI Phys. Fluids PD SEP PY 1994 VL 6 IS 9 BP 3197 EP 3199 DI 10.1063/1.868100 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA PF980 UT WOS:A1994PF98000050 ER PT J AU DAHLBURG, RB AF DAHLBURG, RB TI ON THE IDEAL INITIAL-VALUE PROBLEM FOR THE NEUTRAL SHEET SO PHYSICS OF PLASMAS LA English DT Article ID THERMAL-INSTABILITY; RECONNECTION; STABILITY; FLOW AB The ideal initial value problem for the neutral sheet is considered, with the emphasis on fieldwise-independent, infinitesimal velocity disturbances. It is shown analytically that cross-field velocity perturbations persist, and that they also set up fieldwise magnetic disturbances that grow algebraically in time. When these disturbances attain finite amplitude they should distort the neutral sheet configuration, and hence they could provide an alternative route by which magnetic reconnection can become turbulent. Some supporting numerical simulations, performed at large Lundquist numbers, are then described. In an Appendix the analysis is extended to include fieldwise-dependent disturbances. RP DAHLBURG, RB (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 18 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD SEP PY 1994 VL 1 IS 9 BP 3053 EP 3058 DI 10.1063/1.870497 PG 6 WC Physics, Fluids & Plasmas SC Physics GA PG357 UT WOS:A1994PG35700028 ER PT J AU TRITTEN, JJ AF TRITTEN, JJ TI HOW NAVIES FIGHT - THE UNITED-STATES-NAVY AND ITS ALLIES - UHLIG,F SO POLITICAL SCIENCE QUARTERLY LA English DT Book Review RP TRITTEN, JJ (reprint author), USN,DOCTRINE COMMAND,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ACAD POLITICAL SCIENCE PI NEW YORK PA 475 RIVERSIDE DRIVE, SUITE 1274, NEW YORK, NY 10115-1274 SN 0032-3195 J9 POLIT SCI QUART JI Polit. Sci. Q. PD FAL PY 1994 VL 109 IS 4 BP 731 EP 732 DI 10.2307/2151873 PG 2 WC Political Science SC Government & Law GA PT645 UT WOS:A1994PT64500036 ER PT J AU KARLE, IL FLIPPENANDERSON, JL GURUNATH, R BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL GURUNATH, R BALARAM, P TI FACILE TRANSITION BETWEEN 3(10)-HELIX AND ALPHA-HELIX - STRUCTURES OF 8-RESIDUE, 9-RESIDUE, AND 10-RESIDUE PEPTIDES CONTAINING THE -(LEU-AIB-ALA)(2)-PHE-AIB- FRAGMENT SO PROTEIN SCIENCE LA English DT Article DE ALPHA-AMINOISOBUTYRIC ACID PEPTIDES; HELICAL PEPTIDE STRUCTURES; HELICAL TRANSITIONS; HELIX PACKING; PEPTIDE CONFORMATION ID ALANINE-BASED PEPTIDES; LEU-AIB-OME; AMINOISOBUTYRIC-ACID; CRYSTAL-STRUCTURE; CHAIN-LENGTH; AMINO-ACIDS; PARALLEL; CONFORMATIONS; OLIGOPEPTIDES; AGGREGATION AB A structural transition from a 3(10)-helix to an alpha-helix has been characterized at high resolution for an octapeptide segment located in 3 different sequences. Three synthetic peptides, decapeptide (A) Boc-Aib-Trp-(Leu-Aib-Ala)(2)-Phe-Aib-OMe, nonapeptide (B) Boc-Trp-(Leu-Aib-Ala)(2)-Phe-Aib-OMe, and octapeptide (C) Boc-(Leu-Aib-Ala)(2)-Phe-Aib-OMe, are completely helical in their respective crystals. At 0.9 Angstrom resolution, R factors for A, B, and C are 8.3%, 5.4%, and 7.3%, respectively. The octapeptide and nonapeptide form ideal 3(10)-helices with average torsional angles Q(N-C-alpha) and psi(C-alpha-C') of -57 degrees, -26 degrees for C and -60 degrees, -27 degrees for B. The 10-residue peptide (A) begins as a 3(10)-helix and abruptly changes to an alpha-helix at carbonyl O(3), which is the acceptor for both a 4 --> 1 hydrogen bond with N(6)H and a 5 --> 1 hydrogen with N(7)H, even though the last 8 residues have the same sequence in all 3 peptides. The average phi,psi angles in the decapeptide are -58 degrees, -28 degrees for residues 1-3 and -63 degrees, -41 degrees for residues 4-10. The packing of helices in the crystals does not provide any obvious reason for the transition in helix type. Fourier transform infrared studies in the solid state also provide evidence for a 3(10)- to alpha-helix transition with the amide I band appearing at 1,656-1,657 cm(-1) in the 9- and 10-residue peptides, whereas in shorter sequences the band is observed at 1,667 cm(-1). C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,CODE 6030,WASHINGTON,DC 20375, USA. RI Ramanathan, Gurunath/B-4757-2011 OI Ramanathan, Gurunath/0000-0003-4627-1677 FU NIGMS NIH HHS [GM 30902] NR 38 TC 56 Z9 56 U1 0 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD SEP PY 1994 VL 3 IS 9 BP 1547 EP 1555 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PK830 UT WOS:A1994PK83000020 PM 7833814 ER PT J AU THRANE, EV JODALEN, V STEWART, F SALEEM, D KATAN, J AF THRANE, EV JODALEN, V STEWART, F SALEEM, D KATAN, J TI STUDY OF MEASURED AND PREDICTED RELIABILITY OF THE IONOSPHERIC HF COMMUNICATION CHANNEL AT HIGH-LATITUDES SO RADIO SCIENCE LA English DT Article AB This paper describes observations of the reliability of the ionospheric HF communication channel within and close to the northern auroral zone. Automatic equipment has been developed to measure reliability and virtual reflection height as a function of frequency in an hourly cycle. Measurements have been made over two propagation paths within Norway. The data show diurnal and seasonal variations as well as dependence of the measured parameters on geomagnetic conditions. The observations have been compared with predictions obtained from the Ionospheric Communication Enhanced Profile Analysis and Circuit Prediction Program (ICEPAC) prediction code. This code includes a model of the high-latitude and polar ionospheres and their dependence upon geomagnetic disturbances. The results of the comparison show that ICEPAC represents an improvement over previous codes but that transmission losses are not properly included. C1 USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320. RP THRANE, EV (reprint author), NORWEGIAN DEF RES ESTAB,DIV ELECTR,POB 25,N-2007 KJELLER,NORWAY. NR 12 TC 3 Z9 3 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD SEP-OCT PY 1994 VL 29 IS 5 BP 1293 EP 1309 DI 10.1029/94RS01162 PG 17 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA PJ411 UT WOS:A1994PJ41100012 ER PT J AU PROHASKA, R GARATE, E PAPADICHEV, V FISHER, A ROSTOKER, N AF PROHASKA, R GARATE, E PAPADICHEV, V FISHER, A ROSTOKER, N TI VACUUM DESENSITIZATION OF CR-39 TRACK RECORDING PLASTIC SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID REGISTRATION AB It has been observed that prolonged (several hours) exposure to vacuum (P<10(-4) Torr) renders CR-39 insensitive to the passage of 5.67 MeV alpha particles. Subsequent exposure to air results in a recovery of sensitivity. C1 PN LEBEDEV PHYS INST, MOSCOW 117924, RUSSIA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP PROHASKA, R (reprint author), UNIV CALIF IRVINE, DEPT PHYS, IRVINE, CA 92717 USA. RI Papadichev, Vitaly/N-4079-2015 NR 4 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1994 VL 65 IS 9 BP 3020 EP 3021 DI 10.1063/1.1144595 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PJ058 UT WOS:A1994PJ05800049 ER PT J AU HARRIS, PJ AF HARRIS, PJ TI AN EXPERT-SYSTEMS TECHNOLOGY APPROACH TO MAINTENANCE PROFICIENCY SO ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING LA English DT Article; Proceedings Paper CT 2nd World Congress on Expert Systems CY JAN 10-14, 1994 CL LISBON ESTORIL, PORTUGAL SP Int Soc Intelligent Syst AB Traditional maintenance training curricula use paper technical manuals to teach ''tricks of the trade'' in corrective and preventive maintenance which requires multiple adjustments, lengthy calibrations and labor-intensive test/checkout procedures. Rotation often delays personnel assignment to a platform which requires these maintenance skills. The nonavailability of skilled maintenance personnel poses a tremendous threat to readiness conditions for mission critical equipment. In order to best support the Navy's maintenance requirements and improve maintenance efficiency, the Naval Research Laboratory at Stennis Space Center, Mississippi developed an Expert Maintenance Advisor (EMA). This paper discusses an approach which implements Expert Systems technology methods to develop an expert maintenance reference. It also addresses the impact of performance support systems and interactive electronic technical manuals in maintenance training. RP HARRIS, PJ (reprint author), USN,RES LAB,DIV OCEANOG,OCEAN TECHNOL BRANCH,CODE 7350,BLDG 1005,ROOM D21,BAY ST LOUIS,MS 39529, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0736-5845 J9 ROBOT CIM-INT MANUF JI Robot. Comput.-Integr. Manuf. PD SEP PY 1994 VL 11 IS 3 BP 195 EP 199 DI 10.1016/0736-5845(94)90034-5 PG 5 WC Computer Science, Interdisciplinary Applications; Engineering, Manufacturing; Robotics SC Computer Science; Engineering; Robotics GA RE707 UT WOS:A1994RE70700007 ER PT J AU MCGRATH, KJ ROLAND, CM AF MCGRATH, KJ ROLAND, CM TI NMR-STUDY OF MISCIBILITY IN POLYEPICHLOROHYDRIN POLY(VINYLMETHYLETHER) BLENDS SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; XE-129 NMR; POLYMER BLENDS; CHEMICAL-SHIFT; SOLID-STATE; C-13 NMR; MIXTURES; ZEOLITES; POLY(VINYLETHYLENE); POLYISOPRENE AB Xe-128 NMR spectroscopy is employed to demonstrate that polyepichlorohydrin and poly(vinylmethylether), which have virtually equal glass transition temperatures, form thermodynamically miscible blends. This conclusion is drawn from the appearance of a single resonance in the blend spectrum, at a chemical shift differing from that calculated for the fast exchange regime. C-13 NMR results are consistent with thermodynamic miscibility, and reflect the similarity of the component dynamics. RP MCGRATH, KJ (reprint author), USN,RES LAB,CODE 6120,WASHINGTON,DC 20375, USA. NR 38 TC 9 Z9 9 U1 0 U2 1 PU AMER CHEMICAL SOC INC PI AKRON PA RUBBER DIV UNIV AKRON PO BOX 499, AKRON, OH 44309-0499 SN 0035-9475 J9 RUBBER CHEM TECHNOL JI Rubber Chem. Technol. PD SEP-OCT PY 1994 VL 67 IS 4 BP 629 EP 635 DI 10.5254/1.3538698 PG 7 WC Polymer Science SC Polymer Science GA PR760 UT WOS:A1994PR76000006 ER PT J AU SINNOTT, SB COLTON, RJ WHITE, CT BRENNER, DW AF SINNOTT, SB COLTON, RJ WHITE, CT BRENNER, DW TI SURFACE PATTERNING BY ATOMICALLY-CONTROLLED CHEMICAL FORCES - MOLECULAR-DYNAMICS SIMULATIONS SO SURFACE SCIENCE LA English DT Letter ID SCANNING-TUNNELING-MICROSCOPE; ATOMISTIC SIMULATIONS; DIAMOND FILMS; MANIPULATION; ATOM; STM AB The use of atomically-controlled reactive chemical forces via modified scanning-probe microscope tips provides a potentially powerful way of building nanodevices. In this work, we use atomistic simulations to explore the feasibility of one such system, namely the selective abstraction of hydrogen from a diamond surface using a tip with a chemisorbed ethynyl radical. We characterize reaction rates and energy flow at the tip, and conclude that they are sufficiently fast to make this approach feasible. We propose a novel tip design to perform the abstraction without inadvertently damaging the surface or probe tip. RP SINNOTT, SB (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,CODE 6170,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; Sinnott, Susan/P-8523-2014 OI Sinnott, Susan/0000-0002-3598-0403 NR 15 TC 35 Z9 35 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 1 PY 1994 VL 316 IS 1-2 BP L1055 EP L1060 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PE545 UT WOS:A1994PE54500007 ER PT J AU SPIEL, DE AF SPIEL, DE TI THE SIZES OF THE JET DROPS PRODUCED BY AIR BUBBLES BURSTING ON SEA-WATER AND FRESH-WATER SURFACES SO TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY LA English DT Article AB The size distributions of the top 6 jet drops produced by air bubbles bursting on sea- and fresh-water surfaces are presented for bubbles with radii from 350 to 1500 mum. There are no significant differences in the results between sea- and fresh-water. Except for the top drop, the size distributions are often bimodal. For the top jet drop, the dependence of the average droplet radius, R(d), on bubble radius, R(b), is given by the fit R(d) = 0.0337 R(b)1.208 (mum) which compares well with the results for the top drop reported by Blanchard in 1989. Excluding the droplets in the small modes, the droplet size dependence on bubble size for the lower droplets (those subsequent to the top drop) is, within statistical certainty, the same for all the droplets from the second through the fifth. The data for these droplets is fit by R(d) = 0.0165 R(b)1.325. The probability that a bubble with a given radius produces at least n drops is given for n up to 7, although a small number of bubble bursts were observed to have produced at least 15 jet droplets. RP SPIEL, DE (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 0 TC 30 Z9 30 U1 0 U2 6 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0280-6509 J9 TELLUS B JI Tellus Ser. B-Chem. Phys. Meteorol. PD SEP PY 1994 VL 46 IS 4 BP 325 EP 338 DI 10.1034/j.1600-0889.1994.t01-2-00007.x PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PP572 UT WOS:A1994PP57200007 ER PT J AU MCCARTHY, MC ELTIGANI, A KHALID, IO HYAMS, KC AF MCCARTHY, MC ELTIGANI, A KHALID, IO HYAMS, KC TI HEPATITIS-B AND HEPATITIS-C IN JUBA, SOUTHERN SUDAN - RESULTS OF A SEROSURVEY SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID 2ND-GENERATION ASSAYS; VIRUS-INFECTION; ANTIBODY; HIV-1 AB To compare the epidemiology of hepatitis B virus (HBV) with hepatitis C virus (HCV) in a southern Sudanese population, 666 out-patients attending 6 public clinics in the city of Juba were enrolled in a serosurvey. The average age of subjects was 16 years; 54% were female. Of the 651 samples tested for hepatitis B markers, HBsAg was found in 26% and anti-HBc in 67%. In contrast, only 21 (3%) of the 666 samples were positive for anti-HCV using a second generation immunoblot assay (RIBA-2). Seventeen (81%) of the 21 anti-HCV-positive subjects were positive for anti-HBc, compared to 66% (418/630) of subjects negative for anti-HCV (P=0.07). None of the anti-HCV-positive subjects reported receiving a prior blood transfusion and only 5 subjects reported a history of jaundice. Nine of the 21 (43%) anti-HCV-positive subjects reported a history of scarification, compared to 23% (148/645) of anti-HCV-negative subjects (P=0.01). Hepatitis B infection was also associated with scarification by univariate analysis. However, after adjustment for age a history of scarification was not significantly associated with hepatitis C infection, but it was with HBV infection (odds ratio=1.5, 95% CI 1.0-2.5; P=0.05). The findings of this study indicate that HCV infection is not highly endemic in this population and that the epidemiology of HCV differs from that of HBV. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. MINIST HLTH SUDAN,KHARTOUM,SUDAN. USN,MED RES INST,BETHESDA,MD. NR 13 TC 27 Z9 28 U1 0 U2 0 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD SEP-OCT PY 1994 VL 88 IS 5 BP 534 EP 536 DI 10.1016/0035-9203(94)90150-3 PG 3 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA PQ487 UT WOS:A1994PQ48700010 PM 7992329 ER PT J AU MARKOWITZ, MA SINGH, A CHANG, EL AF MARKOWITZ, MA SINGH, A CHANG, EL TI FORMATION AND PROPERTIES OF A NETWORK GEL FORMED FROM MIXTURES OF DIACETYLENIC AND SHORT-CHAIN PHOSPHOCHOLINE LIPIDS SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID BILAYERS; MICELLES AB A polymerizable gel superaggreagate has been formed from low concentrations (6 mM) of phospholipid mixtures of polymerizable 1,2-bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine and 1,2-bis(dinonoyl)-sn-glycero-3-phosphocholine. Transmission electron microscopy (TEM) revealed that the superaggregate structure consisted of a network of twisted, braided fibers and that the pare size of the gel ranged from 0.1 to 1.0 pm TEM of gel plated with Ni revealed that the width of the fibers was 280 A. Optical microscopy demonstrated that the onset of the gel phase occurred at mole fraction 0.43 DNPC in the absence of salt and 0.36 in the presence of 0.25 M NaCl. Polymerization did not affect the morphology of the gel but did increase its temperature stability. (C) 1994 Academic Press Inc. RP MARKOWITZ, MA (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 15 TC 17 Z9 17 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD AUG 30 PY 1994 VL 203 IS 1 BP 296 EP 305 DI 10.1006/bbrc.1994.2181 PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PD473 UT WOS:A1994PD47300042 PM 8074670 ER PT J AU KENNEDY, TA GLASER, ER MURDIN, BN PIDGEON, CR PRIOR, KA CAVENETT, BC AF KENNEDY, TA GLASER, ER MURDIN, BN PIDGEON, CR PRIOR, KA CAVENETT, BC TI IDENTIFICATION OF V(SE)-IMPURITY PAIRS IN ZNSEN SO APPLIED PHYSICS LETTERS LA English DT Article ID RESONANCE; CENTERS AB Optically detected magnetic resonance (ODMR) of heavily nitrogen-doped ZnSe at 24 GHz reveals an anisotropic spectrum which can be assigned to a deep donor comprised of a Se vacancy paired with an impurity. The newly resolved spectrum is trigonal along [111] with g(parallel-to) = 2.0072(2) and g(perpendicular-to) =2.0013(2). Comparison of this g tensor with previous work leads to the assignment of the spectrum to V(Se)-X, where X is most probably Cu or Ag. Combining this result with previous photoluminescence and ODMR work shows that ZnSe:N has three distinct donors which include both impurities and intrinsic defects. C1 HERIOT WATT UNIV,DEPT PHYS,EDINBURGH EH14 4AS,MIDLOTHIAN,SCOTLAND. RP KENNEDY, TA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 21 Z9 21 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 29 PY 1994 VL 65 IS 9 BP 1112 EP 1114 DI 10.1063/1.112114 PG 3 WC Physics, Applied SC Physics GA PE158 UT WOS:A1994PE15800016 ER PT J AU RUSHING, RA THOMPSON, C CASSIDY, PE AF RUSHING, RA THOMPSON, C CASSIDY, PE TI INVESTIGATION OF POLYAMINE QUINONES AS HYDROPHOBIC CURATIVES FOR EPOXY-RESINS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID POLYMERS AB Polyamine quinones (PAQs), which have been used previously to produce solvent-based coatings with exceptional durability in corrosive environments, were synthesized and blended with an aliphatic diamine (diethylenetriamine, DETA) to provide a liquid, epoxy curing agent. The PAQ-amine mixture was evaluated as a curing agent for an epoxy matrix resin system for glass-reinforced composites. After elevated temperature water exposure, short-beam shear and dynamic mechanical analyses were performed on the composites. The ability of PAQs to enhance fiber-resin bonding was evaluated. Dynamic mechanical analysis (DMA), which is a sensitive measurement of fiber-resin interactions, showed that the PAQ curative enhances strength retention of composites exposed to aggressive environments. (C) 1994 John Wiley & Sons, Inc. C1 USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856. SW TEXAS STATE UNIV,SAN MARCOS,TX 78666. RP RUSHING, RA (reprint author), TRI AUSTIN INC,AUSTIN,TX 78733, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD AUG 29 PY 1994 VL 53 IS 9 BP 1211 EP 1219 DI 10.1002/app.1994.070530908 PG 9 WC Polymer Science SC Polymer Science GA PC013 UT WOS:A1994PC01300008 ER PT J AU SCHECHTER, RS CHASKELIS, HH MIGNOGNA, RB DELSANTO, PP AF SCHECHTER, RS CHASKELIS, HH MIGNOGNA, RB DELSANTO, PP TI REAL-TIME PARALLEL COMPUTATION AND VISUALIZATION OF ULTRASONIC PULSES IN SOLIDS SO SCIENCE LA English DT Article AB Parallel processing has changed the way much computational physics is done. Areas such as condensed matter physics, fluid dynamics, and other fields are making use of massively parallel computers to solve immense and important problems in new ways. Simulating wave propagation is another area that has benefited through the use of parallel processing. This is graphically illustrated in this article by various numerical simulations of ultrasonic pulses propagating through solids carried out on a massively parallel computer. These computations are accompanied by visualizations of the resulting wavefield. The calculations and visualizations, together, can be completed in only seconds to several minutes and compare well with experimental data. The computations and parallel processing techniques described should be important in related fields, such as geophysics, acoustics, and mechanics. C1 POLITECN TORINO, I-10129 TURIN, ITALY. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 18 TC 70 Z9 73 U1 0 U2 3 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD AUG 26 PY 1994 VL 265 IS 5176 BP 1188 EP 1192 DI 10.1126/science.265.5176.1188 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PD422 UT WOS:A1994PD42200024 PM 17787582 ER PT J AU MARSHALL, JS GRANT, JR AF MARSHALL, JS GRANT, JR TI EVOLUTION AND BREAKUP OF VORTEX RING SIN STRAINING AND SHEARING FLOWS SO JOURNAL OF FLUID MECHANICS LA English DT Article ID FULLY-DEVELOPED TURBULENCE; ELLIPTIC VORTEX; DYNAMICS; STABILITY; FILAMENT; MOTION; MODEL; AREA AB A study of the effect of external straining and shearing flows on the evolution and form of breakup of vortex rings has been performed. Two orientations each of straining and shearing flows are considered. A theoretical analysis of the ring motion for small strain and shear rates is performed, and it is found that for shearing and straining flows in the plane of the ring, the ring may oscillate periodically. For a straining flow with compression normal to the initial plane of the ring, the linear theory predicts that the ring radius will expand with time. For shearing flow normal to the initial plane of the ring, the linear theory predicts tilting of the ring in the direction of the shear flow rotation. Numerical calculations are performed with both single vortex filaments and with a three-dimensional discrete vortex element method. The numerical calculations confirm the predictions of the linear theory for values of strain and shear rates below a certain critical value (which depends on the ratio R/sigma0 of initial ring to core radii), whereas for strain and shear rates above this value the ring becomes very elongated with time and eventually pinches off. Three distinct regimes of long-time behaviour of the ring have been identified. Regime selection depends on initial ring geometry and orientation and on values of strain and shear rates. These regimes include (i) periodic oscillations with no pinching off, (ii) pinching off at the ring centre, and (iii) development of an elongated vortex pair at the ring centre and wider 'heads' near the ends (with pinching off just behind the heads). The boundaries of these regimes and theoretical reasons for the vortex behaviour in each case are described. It is also shown that the breakup of stretched vortex rings exhibits a self-similar behaviour, in which the number and size of 'offspring' vortices, at the point of pinching-off the ring, may be scaled by the product of the strain rate e (or shear rate s) and the oscillation period tau of a slightly elliptical ring with mean radius R. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP MARSHALL, JS (reprint author), UNIV IOWA,IOWA INST HYDRAUL RES,IOWA CITY,IA 52242, USA. NR 27 TC 8 Z9 8 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD AUG 25 PY 1994 VL 273 BP 285 EP 312 DI 10.1017/S0022112094001941 PG 28 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA PE845 UT WOS:A1994PE84500012 ER PT J AU DOYLE, RJ DUNLAP, BI AF DOYLE, RJ DUNLAP, BI TI REARRANGEMENTS IN NEGATIVELY CHARGED AMMONIUM-NITRATE CLUSTERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID GAS-PHASE; DENSITY; HEXAHYDRO-1,3,5-TRINITRO-1,3,5-TRIAZINE; APPROXIMATION; GEOMETRIES; COMPLEXES; NITRAMINE; ENERGY AB The sputtering of condensed-phase ammonium nitrate yields an extensive distribution of cluster ions with the general formula [NH4NO3)(n)NO3]-, where n 3 to >40. Only a very low relative abundance of the n land the n = 2 species are detected by mass spectrometry. Collision-induced dissociation experiments suggest that [NH4NO3)NO3]- rearranges to lose NH3 and form [H(NO3)(2)](-), which is detected at high relative abundance. Gradient-corrected density functional calculations show that there is strong hydrogen bonding in NH4NO3 and essentially no hydrogen bonding in [NH4NO3)NO3](-). Thus, with a relatively small amount of internal energy the latter can rearrange to lose a neutral ammonia molecule. RP DOYLE, RJ (reprint author), USN, RES LAB, DIV CHEM, CODE 6100, WASHINGTON, DC 20375 USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 24 TC 3 Z9 3 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 25 PY 1994 VL 98 IS 34 BP 8261 EP 8263 DI 10.1021/j100085a001 PG 3 WC Chemistry, Physical SC Chemistry GA PD464 UT WOS:A1994PD46400001 ER PT J AU SCHIFF, SJ JERGER, K DUONG, DH CHANG, T SPANO, ML DITTO, WL AF SCHIFF, SJ JERGER, K DUONG, DH CHANG, T SPANO, ML DITTO, WL TI CONTROLLING CHAOS IN THE BRAIN SO NATURE LA English DT Article ID RAT HIPPOCAMPAL SLICE; INTERICTAL SPIKING; POTASSIUM; SEIZURES; SYSTEM AB In a spontaneously bursting neuronal network in vitro, chaos can be demonstrated by the presence of unstable fixed-point behaviour. Chaos control techniques can increase the periodicity of such neuronal population bursting behaviour. Periodic pacing is also effective in entraining such systems, although in a qualitatively different fashion. Using a strategy of anticontrol such systems can be made less periodic. These techniques may be applicable to in vivo epileptic foci. C1 GEORGE WASHINGTON UNIV,SCH MED,WASHINGTON,DC 20010. USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903. GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. RP SCHIFF, SJ (reprint author), CHILDRENS NATL MED CTR,DEPT NEUROSURG,WASHINGTON,DC 20010, USA. RI Spano, Mark/B-6883-2011; OI Ditto, William/0000-0002-7416-8012 NR 23 TC 624 Z9 640 U1 5 U2 34 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD AUG 25 PY 1994 VL 370 IS 6491 BP 615 EP 620 DI 10.1038/370615a0 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PD310 UT WOS:A1994PD31000040 PM 8065447 ER PT J AU CROWE, LM SPARGO, BJ IONEDA, T BEAMAN, BL CROWE, JH AF CROWE, LM SPARGO, BJ IONEDA, T BEAMAN, BL CROWE, JH TI INTERACTION OF CORD FACTOR (ALPHA,ALPHA'-TREHALOSE-6,6'-DIMYCOLATE) WITH PHOSPHOLIPIDS SO BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES LA English DT Article DE TREHALOSE DIMYCOLATE; LIPOSOME FUSION; PHOSPHATIDYLSERINE; DSC; FTIR; BILAYER HYDRATION ID PHAGOSOME-LYSOSOME FUSION; CULTURED MACROPHAGES; MEMBRANE-FUSION; PHOSPHATIDYLSERINE BILAYERS; MYCOBACTERIUM-TUBERCULOSIS; NOCARDIA-ASTEROIDES; POLYANIONIC AGENTS; CALCIUM-IONS; INHIBITION; 6,6'-DIMYCOLATE AB We previously reported that cord factor (alpha,alpha-trehalose-6,6'-dimycolate) isolated from Nocardia asteroides strain GUH-2 strongly inhibits fusion between unilamellar vesicles containing acidic phospholipid. We chose to study the effects of this molecule on liposome fusion since the presence of N. asteroides GUH-2 in the phagosomes of mouse macrophages had been shown to prevent phagosomal acidification and inhibit phagosome-lysosome fusion. A virtually non-virulent strain, N. asteroides 10905, does not prevent acidification or phagosome-lysosome fusion and, further, contains only trace amounts of cord factor. fn the present paper, we have investigated the effects of cord factor on phospholipid bilayers that could be responsible for the inhibition of fusion. We show that cord factor increases molecular area, measured by isothermal compression of a monolayer film, in a mixed monolayer more than would be expected based in its individual contribution to molecular area. Cord factor, as well as other glycolipids investigated, increased the overall hydration of bilayers of dipalmitoylphosphatidylcholine by 50%, as estimated from the unfrozen water fraction measured by differential scanning calorimetry. The effect of calcium on this increased molecular area and headgroup hydration was measured by fluorescence anisotropy and FTIR spectroscopy of phosphatidylserine liposomes. Both techniques showed that cord factor, incorporated at 10 mol%, increased acyl chain disorder over controls in the presence of Ca2+. However, FTIR showed that cord factor did not prevent headgroup dehydration by the Ca2+. The other glycolipids tested did not prevent either the Ca2+-induced chain crystallization or headgroup dehydration of phosphatidylserine bilayers. These data point to a possible role of the bulky mycolic acids of cord factor in preventing Ca2+-induced fusion of liposomes containing acidic phospholipids. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. UNIV SAO PAULO,DEPT MICROBIOL,SAO PAULO,BRAZIL. UNIV CALIF DAVIS,DEPT MED MICROBIOL & IMMUNOL,DAVIS,CA 95616. RP CROWE, LM (reprint author), UNIV CALIF DAVIS,MOLEC & CELL BIOL SECT,DAVIS,CA 95616, USA. FU NIAID NIH HHS [2RO1-AI20900, 5RO1-AI20900-8] NR 47 TC 28 Z9 29 U1 2 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0005-2736 J9 BBA-BIOMEMBRANES JI Biochim. Biophys. Acta-Biomembr. PD AUG 24 PY 1994 VL 1194 IS 1 BP 53 EP 60 DI 10.1016/0005-2736(94)90202-X PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PE492 UT WOS:A1994PE49200007 PM 8075141 ER PT J AU FLIPPENANDERSON, JL HRUBY, VJ COLLINS, N GEORGE, C CUDNEY, B AF FLIPPENANDERSON, JL HRUBY, VJ COLLINS, N GEORGE, C CUDNEY, B TI X-RAY STRUCTURE OF [D-PEN(2),D-PEN(5)]ENKEPHALIN, A HIGHLY POTENT, DELTA-OPIOID RECEPTOR-SELECTIVE COMPOUND - COMPARISONS WITH PROPOSED SOLUTION CONFORMATIONS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID BIS-PENICILLAMINE ENKEPHALIN; PEPTIDE ENKEPHALIN; DYNAMIC CONSIDERATIONS; ENERGY MINIMIZATION; DISULFIDE BOND; BINDING-SITES; ANALOGS; DESIGN; AGONIST; NMR AB [D-Pen(2), D-Pen(5)]enkephalin (DPDPE), a cyclic, constrained, highly potent, and delta opioid receptor-selective analogue of enkephalin, has been obtained from an aqueous solution in a crystalline form suitable for X-ray analysis. It crystallizes in the triclinic space group P1. The unit cell contains three conformationally distinct molecules of DPDPE which are located with approximate 3-fold symmetry about a water channel made up of approximately 24 disordered and one ordered water molecules. There are also 13 ordered water molecules which form an intricate network of hydrogen bonds which hold the peptide molecules together in the crystal. The conformation of the 14-membered ring is essentially identical for all three molecules; however, the Tyr-1 residue is conformationally different in each case. Comparison of the conformations found in the crystal with those previously determined by NMR methods in conjunction with energy calculations indicates that the most favorable conformation of the 14-membered ring in aqueous solution is similar to that in the crystal. This was interpreted to be due to the cyclic constraint in DPDPE and the high degree of solvation in the crystal structure. In addition, low-energy conformations previously determined by computational methods in attempts to determine the binding conformations of DPDPE gave conformations of the 14-membered rings which were generally similar to those found in the crystal structure. These results and previous structure-activity relationships suggest that the solid-state conformations are a useful starting point for understanding the bioactive conformation important for biological activity and delta receptor selectivity of cyclic enkephalin analogues. C1 HAMPTON RES,RIVERSIDE,CA 92507. UNIV ARIZONA,DEPT CHEM,TUCSON,AZ 85721. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 48 TC 62 Z9 62 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD AUG 24 PY 1994 VL 116 IS 17 BP 7523 EP 7531 DI 10.1021/ja00096a008 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA PD697 UT WOS:A1994PD69700008 ER PT J AU EATON, PE GALOPPINI, E GILARDI, R AF EATON, PE GALOPPINI, E GILARDI, R TI ALKYNYLCUBANES AS PRECURSORS OF RIGID-ROD MOLECULES AND ALKYNYLCYCLOOCTATETRAENES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID P-CARBORANES; REAGENTS; CUBANES AB We have developed new methodology for the synthesis of alkynylcubanes and have used these compounds to make rigid-rod molecules constructed of cubane and acetylene subunits. Terminal and substituted alkynylcubanes 7a, 7b, 8a, 8b, 12a, and 12b were synthesized by n-BuLi-promoted elimination of halogen from 1,1-dibromovinylcubanes 6a, 6b, and 11, followed by quenching with electrophiles. Systems with one or two acetylenic units between two cubanes were also prepared: dicubylacetylene (15) was obtained via reaction of the lithium ylide of (trimethylsilyl)diazomethane with dicubyl ketone (14); 1,4-dicubyl-1,3-butadiyne (16) was made by oxidative dimerization of ethynylcubane (7a). Dimerizations and cross-coupling reactions of various 1,4-diethynylcubanes afforded longer rods, e.g., 1,4-bis-((trimethylsilyl)ethynyl)cubyl- 1,3-butadiyne (18) and 1-(4-((trimethylsilyl)ethynyl)cubyl)-4-cubyl-1,3-butadiyne (21). Rh(I)-promoted ring opening of the cubane subunit(s) of these compounds into the corresponding tricyclooctadiene followed by thermal rearrangement to the cyclooctatetraene was used to convert 7a, 8a, and 12a into the mono- and disubstituted alkynylcyclooctatetraenes 22a, 22b, and 23 and to take 15 and 16 into the alkynyl-bridged cyclooctatetraenes 24a and 24b, respectively. X-ray crystallographic analysis of 12a, 15, 16, and 18 revealed interesting details about their structures. C1 USN, RES LAB, STRUCT MATTER LAB, WASHINGTON, DC 20375 USA. RP EATON, PE (reprint author), UNIV CHICAGO, DEPT CHEM, 5735 S ELLIS AVE, CHICAGO, IL 60637 USA. NR 39 TC 62 Z9 63 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD AUG 24 PY 1994 VL 116 IS 17 BP 7588 EP 7596 DI 10.1021/ja00096a016 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA PD697 UT WOS:A1994PD69700016 ER PT J AU BOWMAN, SR RABINOVICH, WS KYONO, CS KATZER, DS IKOSSIANASTASIOU, K AF BOWMAN, SR RABINOVICH, WS KYONO, CS KATZER, DS IKOSSIANASTASIOU, K TI HIGH-RESOLUTION SPATIAL LIGHT MODULATORS USING GAAS/ALGAAS MULTIPLE-QUANTUM WELLS SO APPLIED PHYSICS LETTERS LA English DT Article ID DEVICES AB We report improved performance in semi-insulating GaAs/AlGaAs quantum well based spatial light modulators grown by molecular beam epitaxy. The optically addressed modulator reported here are of a new design and have significantly higher spatial resolution than previously reported devices. Strong diffraction efficiencies are described for spatial periods as fine as 2.6 mum at framing rate as high as 600 kHz. Two modulators are characterized, one with x=0.1 and the other with x=0.3 for the Al(x)Ga(1-x)As quantum barriers of the superlattices. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. RP BOWMAN, SR (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5640,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 6 TC 23 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 22 PY 1994 VL 65 IS 8 BP 956 EP 958 DI 10.1063/1.112160 PG 3 WC Physics, Applied SC Physics GA PC897 UT WOS:A1994PC89700010 ER PT J AU WOLF, JA KREBS, JJ PRINZ, GA AF WOLF, JA KREBS, JJ PRINZ, GA TI GROWTH AND MAGNETIC CHARACTERIZATION OF FACE-CENTERED-CUBIC CO ON (001) DIAMOND SO APPLIED PHYSICS LETTERS LA English DT Article ID ULTRATHIN COBALT FILMS; MONOLAYERS AB We report the growth and characterization of face centered cubic (fcc) Co epitaxial films (t = 10-130 nm) on diamond. Growth was carried out under ultrahigh vacuum conditions in a commercial molecular beam epitaxy machine and monitored during growth using reflection high energy electron diffraction which showed single crystal growth oriented with <100>Coparallel-to<100>C. X-ray diffraction studies of the 130 nm sample demonstrated the single crystal fcc growth throughout the entire sample. Vibrating sample and quantum interference magnetometry yields a magnetic moment of (1.05+/-0.1) x 10(3) emu/cm3. Ferromagnetic resonance measurements carried out at 35 GHz yield a large cubic anisotropy K1/M(S) = (-480+/-30) Oe and linewidth of the order of 110 Oe. Spin waves were observed in the thicker samples and the exchange constant determined to be A(Co) = 1.09 x 10(-6) erg/cm. RP WOLF, JA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 22 Z9 22 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 22 PY 1994 VL 65 IS 8 BP 1057 EP 1059 DI 10.1063/1.112151 PG 3 WC Physics, Applied SC Physics GA PC897 UT WOS:A1994PC89700044 ER PT J AU SALVINO, LMW CAWLEY, R AF SALVINO, LMW CAWLEY, R TI SMOOTHNESS IMPLIES DETERMINISM - A METHOD TO DETECT IT IN TIME-SERIES SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHAOS; NOISE AB Continuity on an embedded phase space is enough to imply determinism in time series. Also, it is possible to define infinitely many arbitrary vector fields over an attractor. We exploit this arbitrariness to generate a detector of smoothness and therefore of determinism in time series. We report results of numerical studies of both flow and map examples and of a chaotic experimental system. RP SALVINO, LMW (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903, USA. NR 10 TC 48 Z9 51 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 22 PY 1994 VL 73 IS 8 BP 1091 EP 1094 DI 10.1103/PhysRevLett.73.1091 PG 4 WC Physics, Multidisciplinary SC Physics GA PC884 UT WOS:A1994PC88400010 ER PT J AU HAMMER, PW PLATT, N HAMMEL, SM HEAGY, JF LEE, BD AF HAMMER, PW PLATT, N HAMMEL, SM HEAGY, JF LEE, BD TI EXPERIMENTAL-OBSERVATION OF ON-OFF INTERMITTENCY SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHAOS; TRANSITION; SYSTEMS AB We observe on-off intermittency in a nonlinear electronic circuit tuned near a Hopf bifurcation point. The circuit is driven randomly through the bifurcation point, resulting in intermittent switching between a fixed point (laminar phase) and a limit cycle. The distribution of lengths of laminar phases exhibits -3/2 power law scaling for shorter phases, and an exponential drop for longer phases, due to noise in the system. These results agree with a theoretically predicted distribution. In addition, the crossover from power law to exponential decay obeys the predicted scaling law. C1 USN,CTR SURFACE WARFARE,NONLINEAR DYNAM & WAVELETS GRP,SILVER SPRING,MD 20903. COLUMBIA UNIV,NEW YORK,NY 10027. USN,RES LAB,WASHINGTON,DC 20375. NR 15 TC 110 Z9 110 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 22 PY 1994 VL 73 IS 8 BP 1095 EP 1098 DI 10.1103/PhysRevLett.73.1095 PG 4 WC Physics, Multidisciplinary SC Physics GA PC884 UT WOS:A1994PC88400011 ER PT J AU HIGA, KT GROSHENS, TJ GEDRIDGE, RW AF HIGA, KT GROSHENS, TJ GEDRIDGE, RW TI PREPARATION AND REACTION CHEMISTRY OF GROUP-V AMIDES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR AIR WARFARE,DIV WEAP,DIV CHEM,DEPT RES,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 8 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102184 ER PT J AU DUNLAP, BI KARNA, SP AF DUNLAP, BI KARNA, SP TI LOCAL-DENSITY APPROACH TO PREDICT SELF-CONSISTENT LINEAR AND NONLINEAR-OPTICAL PROPERTIES OF MOLECULES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 11 EP COMP PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101318 ER PT J AU WHITE, CT MINTMIRE, JW BRENNER, DW ROBERTSON, DH AF WHITE, CT MINTMIRE, JW BRENNER, DW ROBERTSON, DH TI ATOMISTIC SIMULATIONS OF SHOCK-INDUCED CHEMISTRY IN SOLIDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. INDIANA UNIV PURDUE UNIV,DEPT CHEM,INDIANAPOLIS,IN 46202. RI Brenner, Donald/D-1741-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 16 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900629 ER PT J AU KELLER, TM AF KELLER, TM TI HIGH-TEMPERATURE COPOLYMER FROM INORGANIC-ORGANIC HYBRID POLYMER AND MULTI-ETHYNYLBENZENE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 19 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901545 ER PT J AU KAFAFI, ZH FLOM, SR SARKAS, HW PONG, RG BARTOLI, FJ AF KAFAFI, ZH FLOM, SR SARKAS, HW PONG, RG BARTOLI, FJ TI NONLINEAR-OPTICAL PROPERTIES OF A POLY-PHENYLENE VINYLENE C-60 COMPOSITE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 28 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901043 ER PT J AU KAFAFI, ZH AF KAFAFI, ZH TI NONLINEAR-OPTICAL PROPERTIES OF THE FULLERENES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 31 EP COMP PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101338 ER PT J AU STALICK, WM MUSHRUSH, GW MURRAY, JH ZAHADAT, N AF STALICK, WM MUSHRUSH, GW MURRAY, JH ZAHADAT, N TI PYROLYSIS FREE-RADICAL REACTIONS OF SUBSTITUTED LONG-CHAIN ALKYL PYRIDINES AND QUINOLINES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEORGE MASON UNIV,FAIRFAX,VA 22030. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 32 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900559 ER PT J AU PAZIK, JC AF PAZIK, JC TI THE IMPACT OF PHYSICAL-CHEMISTRY ON MATERIALS SCIENCE AND TECHNOLOGY AT THE OFFICE-OF-NAVAL-RESEARCH SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OFF NAVAL RES,DIV CHEM & PHYS SCI & TECHNOL,ARLINGTON,VA 22217. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 37 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900649 ER PT J AU TREECE, RE KANER, RB AF TREECE, RE KANER, RB TI SOLID-STATE METATHESIS (SSM) PREPARATION OF MATERIALS FROM INSULATORS TO SUPERCONDUCTORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF LOS ANGELES,CTR SOLID STATE SCI,LOS ANGELES,CA 90024. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 51 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900663 ER PT J AU MERA, AE KELLER, TM AF MERA, AE KELLER, TM TI A COMPARISON OF ACETYLENE-CONTAINING MONOMERS DERIVED FROM NAPHTHALENE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 57 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901072 ER PT J AU MONSHIPOURI, M RUDOLPH, AS AF MONSHIPOURI, M RUDOLPH, AS TI A METHOD FOR FABRICATION OF MONODISPERSE HYDROGEL PARTICLES USING LIPOSOMES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NICHHD,BETHESDA,MD 20892. NRL,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 108 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901123 ER PT J AU MUSHRUSH, GW HARDY, DR AF MUSHRUSH, GW HARDY, DR TI SEDIMENT PRECURSORS IN MIDDLE DISTILLATE FUEL INSTABILITY REACTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,FUELS SECT,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 110 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101928 ER PT J AU MALHOTRA, R HARDY, D HAZLETT, RN AF MALHOTRA, R HARDY, D HAZLETT, RN TI FIELD-IONIZATION MASS-SPECTROMETRIC ANALYSIS OF THE PHENALENE-INDOLE COUPLING PRODUCT - THE NATURE OF INSOLUBLES FORMED IN DIESEL OILS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SRI INT,MENLO PK,CA 94025. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 111 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101929 ER PT J AU HARDY, DR WECHTER, MA AF HARDY, DR WECHTER, MA TI CHARACTERIZATION OF SOLUBLE MACROMOLECULAR OXIDATIVELY REACTIVE SPECIES (SMORS) FROM MIDDLE DISTILLATE DIESEL FUELS - THEIR ORIGIN AND ROLE IN INSTABILITY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MASSACHUSETTS,N DARTMOUTH,MA 02747. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 112 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101930 ER PT J AU WECHTER, MA HARDY, DR AF WECHTER, MA HARDY, DR TI PREDICTING DIESEL FUEL STABILITY AT THE REFINERY USING SMORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MASSACHUSETTS,N DARTMOUTH,MA 02747. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 116 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101934 ER PT J AU WHITE, EW AF WHITE, EW TI A FUEL STABILITY STUDY - FILTERABLE AND ADHERENT INSOLUBLES AS FUNCTIONS OF TIME SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 117 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101935 ER PT J AU BEAL, EJ HARDY, DR AF BEAL, EJ HARDY, DR TI THERMAL-STABILITY OF DIESEL FUELS BY QUANTITATIVE GRAVIMETRIC JFTOT SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 120 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101938 ER PT J AU SHADE, JE BITTERWOLF, TE RHEINGOLD, AL AF SHADE, JE BITTERWOLF, TE RHEINGOLD, AL TI SYNTHESIS AND CHEMISTRY OF PENTAPHENYLCYCLOPENTADIENYL DERIVATIVES OF MOLYBDENUM AND TUNGSTEN CARBONYLS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. UNIV IDAHO,DEPT CHEM,MOSCOW,ID 83844. UNIV DELAWARE,DEPT CHEM,NEWARK,DE 19716. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 130 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102307 ER PT J AU MCELVANY, SW AF MCELVANY, SW TI CHARACTERIZATION OF FULLERENES BY FTMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 131 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26100410 ER PT J AU BERRY, A AF BERRY, A TI SYNTHESIS AND CHARACTERIZATION OF ISOBUTYLANTIMONY COMPOUNDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 138 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102315 ER PT J AU FAMINI, GR CRONCE, DT WILSON, LY AF FAMINI, GR CRONCE, DT WILSON, LY TI APPLYING THE THEORETICAL LINEAR SOLVATION ENERGY RELATIONSHIP TO CORRELATING THE PROPERTIES OF SOLUTES IN POLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,DAHLGREN,VA 22448. USA,EDGEWOOD RES DEV & ENGN CTR,ABERDEEN PROVING GROUND,MD 21010. LA SIERRA UNIV,DEPT CHEM,RIVERSIDE,CA 92515. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 161 EP COMP PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101468 ER PT J AU SON, DY KELLER, TM AF SON, DY KELLER, TM TI LINEAR SILOXANE POLYMERS AS PRECURSORS TO HIGH-TEMPERATURE MATERIALS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 168 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901693 ER PT J AU GEDRIDGE, RW GROSHENS, TJ LOWEMA, CK AF GEDRIDGE, RW GROSHENS, TJ LOWEMA, CK TI ROOM-TEMPERATURE MOCVD OF SB2TE3 FILMS AND LOW-TEMPERATURE SOLUTION PRECIPITATION OF V/VI MATERIALS VIA ME3SINME2 ELIMINATION-REACTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR AIR WARFARE,DIV WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 175 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102351 ER PT J AU REITZ, RP AF REITZ, RP TI SUPERSTABLE ELECTRORHEOLOGICAL FLUIDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,SURFACE WARFARE CTR,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 193 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901207 ER PT J AU HAGANS, PL OGRADY, WE RUSSELL, AE AF HAGANS, PL OGRADY, WE RUSSELL, AE TI PROBING THE ELECTROCHEMICAL INTERFACE WITH SYNCHROTRON-GENERATED FAR-INFRARED RADIATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV NEWCASTLE UPON TYNE,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND. RI Russell, Andrea/B-8114-2009; Russell, Andrea/A-9625-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 197 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101255 ER PT J AU OWRUTSKY, JC BARONAVSKI, AP AF OWRUTSKY, JC BARONAVSKI, AP TI DEEP UV FEMTOSECOND MPI STUDIES OF SMALL GAS-PHASE MOLECULES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. RI Owrutsky, Jeffrey/K-7649-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 202 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900814 ER PT J AU REITZ, RP AF REITZ, RP TI ELECTROSET TECHNOLOGY - ON THE MANUFACTURING FOREFRONT SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 208 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901222 ER PT J AU MORRILL, JS GOODELL, RJ BENESCH, WM AF MORRILL, JS GOODELL, RJ BENESCH, WM TI INTENSITY ENHANCEMENTS IN N2 1PG V'=10 BANDS DUE TO TRANSFER FROM N2(A'5-SIGMA-G+) TO N2(B3-PI-G) SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,IPST,COLLEGE PK,MD 20742. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 214 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900826 ER PT J AU ZHUANG, H GARDELLA, JA HO, T WYNNE, KJ AF ZHUANG, H GARDELLA, JA HO, T WYNNE, KJ TI QUANTITATIVE SURFACE-ANALYSIS OF SOLVENT EFFECT ON FILM FORMATION OF BPAC/DMS COPOLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SUNY BUFFALO,DEPT CHEM,BUFFALO,NY 14214. OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 244 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901768 ER PT J AU PEARSON, WH SCHULTZ, JW AF PEARSON, WH SCHULTZ, JW TI THE USE OF SPREADSHEETS IN THE UNDERGRADUATE CHEMISTRY CURRICULUM SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 270 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26100908 ER PT J AU SASTRI, SB ARMISTEAD, JP KELLER, TM AF SASTRI, SB ARMISTEAD, JP KELLER, TM TI STUDIES ON ACETYLENIC RESINS AS CARBON PRECURSORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 276 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901290 ER PT J AU PEEBLES, LH SNOW, AW PETERS, WC AF PEEBLES, LH SNOW, AW PETERS, WC TI DEUTERIUM-ISOTOPE EFFECT ON THE EXOTHERM OF POLYACRYLONITRILE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 277 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901291 ER PT J AU TREECE, RE HORWITZ, JS DORSEY, PC CHRISEY, DB TANG, J WILLIAMS, RS AF TREECE, RE HORWITZ, JS DORSEY, PC CHRISEY, DB TANG, J WILLIAMS, RS TI PULSED-LASER DEPOSITION OF SUPERLATTICE MATERIALS FOR DEVICE APPLICATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 278 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900890 ER PT J AU SHEINSON, RS AF SHEINSON, RS TI LABORATORY THROUGH FULL-SCALE - THE NAVY HALON TOTAL FLOODING REPLACEMENT PROGRAM SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,NAVY TECHNOL CTR SAFETY & SURVIVABIL,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 281 EP ENVR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26101788 ER PT J AU BUCKLEY, LJ AF BUCKLEY, LJ TI COMPLEX PERMITTIVITY MEASUREMENT TECHNIQUES FOR LOW DIELECTRIC-CONSTANT RESINS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 302 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901826 ER PT J AU TONUCCI, RJ BERRY, AD FATEMI, M AF TONUCCI, RJ BERRY, AD FATEMI, M TI DEPOSITION OF SUBMICRON GAAS WIRES IN NANOCHANNEL ARRAY GLASS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 303 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102479 ER PT J AU KURIHARA, LK CHOW, GM SCHOEN, PE AF KURIHARA, LK CHOW, GM SCHOEN, PE TI NANOCRYSTALLINE METALLIC THIN-FILMS PRODUCED BY THE POLYOL METHOD SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 317 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102493 ER PT J AU KURIHARA, LK CHOW, GM SCHOEN, PE AF KURIHARA, LK CHOW, GM SCHOEN, PE TI SYNTHESIS AND CHARACTERIZATION OF NANOCRYSTALLINE MXCU100-X (M = FE, CO) SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 318 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102494 ER PT J AU CHEEK, GT OGRADY, WE AF CHEEK, GT OGRADY, WE TI QUARTZ-CRYSTAL MICROBALANCE STUDY OF PLATINUM AMALGAMATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 331 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900941 ER PT J AU COLTON, RJ AF COLTON, RJ TI ATOMIC-FORCE MICROSCOPY - SURFACE FORCES AND NANOMECHANICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 376 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26900985 ER PT J AU MINTMIRE, JW WHITE, CT AF MINTMIRE, JW WHITE, CT TI STRUCTURAL-PROPERTIES OF FULLERENE NANOTUBULES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 393 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901002 ER PT J AU GEORGE, RD SNOW, AW SHIRK, JS FLOM, SR PONG, RGS AF GEORGE, RD SNOW, AW SHIRK, JS FLOM, SR PONG, RGS TI PHTHALOCYANINE GLASSES FOR NONLINEAR OPTICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 421 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901435 ER PT J AU FLOM, SR PONG, RGS SHIRK, JS GEORGE, RD SNOW, AW AF FLOM, SR PONG, RGS SHIRK, JS GEORGE, RD SNOW, AW TI NONLINEAR-OPTICAL PROPERTIES OF AND OPTICAL LIMITING BY A GLASSY PHTHALOCYANINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 423 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901437 ER PT J AU HERMAN, WN HAYDEN, LM AF HERMAN, WN HAYDEN, LM TI MAKER FRINGES REVISITED - FORMULATION FOR ABSORBING AND ANISOTROPIC FILMS INCLUDING REFLECTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,NAWC AIRCRAFT DIV,WARMINSTER,PA 18974. UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 438 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901452 ER PT J AU HOOVER, JM SELTZER, MD STENGERSMITH, JD CHAFIN, AP HOLLINS, RA HENRY, RA AF HOOVER, JM SELTZER, MD STENGERSMITH, JD CHAFIN, AP HOLLINS, RA HENRY, RA TI CHROMOPHORE ORIENTATION IN LANGMUIR FILMS OF SYNDIOREGIC, MAIN-CHAIN CHROMOPHORE NONLINEAR-OPTICAL POLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NAVAL AIR WARFARE CTR,RES DEPT,DIV WEAP,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 441 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901455 ER PT J AU SNOW, AW ARMISTEAD, JP AF SNOW, AW ARMISTEAD, JP TI CYANATE RESIN CURE DILATOMETRY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 443 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901967 ER PT J AU SNOW, AW AF SNOW, AW TI CYANATE ESTER MONOMERS - SYNTHESIS AND CHARACTERIZATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 444 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901968 ER PT J AU BESSEL, CA ROLISON, DR AF BESSEL, CA ROLISON, DR TI ELECTROCHEMICAL REACTIVITY OF COBALT(SALEN) IN ZEOLITES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 501 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102676 ER PT J AU CALVERT, JM AF CALVERT, JM TI MONOLAYER SURFACE IMAGING AND PHOTORESIST CHANNEL-CONSTRAINED APPROACHES FOR HIGH-RESOLUTION SELECTIVE METALLIZATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 512 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA269 UT WOS:A1994PA26901526 ER PT J AU TREECE, RE HORWITZ, JS CHRISEY, DB AF TREECE, RE HORWITZ, JS CHRISEY, DB TI SYNTHESIS OF METASTABLE NITRIDES BY PULSED-LASER DEPOSITION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 21 PY 1994 VL 208 BP 622 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA PA261 UT WOS:A1994PA26102797 ER PT J AU SCHEPS, R MYERS, JF MIZELL, G AF SCHEPS, R MYERS, JF MIZELL, G TI HIGH-EFFICIENCY 1.06-MU-M OUTPUT IN A MONOLITHIC NDYVO4 LASER SO APPLIED OPTICS LA English DT Article ID ND LASERS AB A miniature 1.5-mm-long monolithic Nd:YVO4 laser was end pumped with a Ti-sapphire laser. The Nd-doping density was 3 at. %. The maximum output power obtained with 885 mW of absorbed pump power was 495 mW at 1.064 mum. The maximum slope efficiency was 57%, and the output power was only slightly dependent on pump polarization. Laser diode pumping was also demonstrated. Thermal effects were observed to reduce the output power and required active cooling of the laser crystal. C1 OCEAN SURVEILLANCE CTR, SAN DIEGO, CA 92152 USA. VIRGO OPT, PORT RICHEY, FL 34668 USA. RP SCHEPS, R (reprint author), USN, COMMAND CONTROL, DIV RES DEV TESTING & ENGN, CODE 754, SAN DIEGO, CA 92152 USA. NR 16 TC 19 Z9 21 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD AUG 20 PY 1994 VL 33 IS 24 BP 5546 EP 5549 PG 4 WC Optics SC Optics GA PE548 UT WOS:A1994PE54800011 PM 20935951 ER PT J AU STURROCK, PA ANTIOCHOS, SK KLIMCHUK, JA ROUMELIOTIS, G AF STURROCK, PA ANTIOCHOS, SK KLIMCHUK, JA ROUMELIOTIS, G TI ASYMPTOTIC FORMS FOR THE ENERGY OF FORCE-FREE MAGNETIC-FIELD CONFIGURATIONS OF TRANSLATIONAL SYMMETRY SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD ID CORONAL MASS EJECTIONS; EVOLUTION; EQUILIBRIUM; ARCADES; MOTION; SHEAR AB It is known from computer calculations that if a force-free magnetic field configuration is stressed progressively by footpoint displacements, the configuration expands and approaches the open configuration with the same surface flux distribution and the energy of the field increases progressively. For configurations of translational symmetry, it has been found empirically that the energy tends asymptotically to a certain functional form. It is here shown that analysis of a simple model of the asymptotic form of force-free fields of translational symmetry leads to and therefore: justifies this functional form. According to this model, the field evolves in a well-behaved manner with ho indication of instability or loss of equilibrium. C1 USN,RES LAB,WASHINGTON,DC 20375. RP STURROCK, PA (reprint author), STANFORD UNIV,CTR SPACE SCI & ASTROPHYS,STANFORD,CA 94305, USA. RI Klimchuk, James/D-1041-2012; Antiochos, Spiro/D-4668-2012 OI Klimchuk, James/0000-0003-2255-0305; Antiochos, Spiro/0000-0003-0176-4312 NR 28 TC 7 Z9 7 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1994 VL 431 IS 2 BP 870 EP 872 DI 10.1086/174537 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PC148 UT WOS:A1994PC14800039 ER PT J AU DOSCHEK, GA MARISKA, JT STRONG, KT BENTLEY, RD BROWN, CM CULHANE, JL LANG, J STERLING, AC WATANABE, T AF DOSCHEK, GA MARISKA, JT STRONG, KT BENTLEY, RD BROWN, CM CULHANE, JL LANG, J STERLING, AC WATANABE, T TI THE 1991 NOVEMBER 9 FLARE AT 03.2-UT - OBSERVATIONS FROM YOHKOH SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, X-RAYS, GAMMA-RAYS ID X-RAY-SPECTRA; BRAGG CRYSTAL SPECTROMETER; SOLAR-A MISSION; NUMERICAL SIMULATIONS; CHROMOSPHERIC EVAPORATION; IMPULSIVE PHASE; PLASMA MOTIONS; TEMPERATURES; SPECTROSCOPY; DIAGNOSTICS AB We discuss X-ray spectra and soft X-ray images of an M1.9 flare that occurred on 1991 November 9 near 03.2 UT. These data were obtained with instrumentation on the Japanese Yohkoh spacecraft. They cover the entire rise phase and peak flare emission, and the beginning of the decay phase. We determine the dynamics, temperature, and emission measure of the flare as inferred from the X-ray line profiles of resonance lines of Fe XXV, Ca XIX, and S XV. We discuss the morphology of the flare as inferred from the soft X-ray images. The November 9 flare is atypical in that a stronger than usual blueshifted emission component (relative to the stationary component) is observed for the resonance lines at flare onset. We discuss several methods for deconvolving the blueshifted component from the stationary component. The X-ray line profiles are consistent with predictions of numerical simulations of chromospheric evaporation. The X-ray images reveal a flare with a complicated loop geometry that is not fully understood. Many of the features in the images are moving upwards at speeds ranging from a few km s-1 to about 800 km s-1. The blueshifted emission begins near the onset of hard X-ray emission, implying that particle acceleration and upflowing plasma have a common energy source. C1 RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. LOCKHEED SOLAR & ASTROPHYS LAB, PALO ALTO, CA 94304 USA. UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. COMPUTAT PHYS INC, FAIRFAX, VA 22031 USA. NATL ASTRON OBSERV JAPAN, MITAKA, TOKYO 181, JAPAN. RP DOSCHEK, GA (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 31 TC 18 Z9 18 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1994 VL 431 IS 2 BP 888 EP 900 DI 10.1086/174540 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PC148 UT WOS:A1994PC14800042 ER PT J AU LEISING, MD KURFESS, JD CLAYTON, DD GRABELSKY, DA GROVE, JE JOHNSON, WN JUNG, GV KINZER, RL KROEGER, RA PURCELL, WR STRICKMAN, MS THE, LS ULMER, MP AF LEISING, MD KURFESS, JD CLAYTON, DD GRABELSKY, DA GROVE, JE JOHNSON, WN JUNG, GV KINZER, RL KROEGER, RA PURCELL, WR STRICKMAN, MS THE, LS ULMER, MP TI HARD X-RAYS FROM SN-1993J SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; GAMMA RAYS, OBSERVATIONS; SUPERNOVAE, INDIVIDUAL (SN-1993J); X-RAYS, GENERAL ID IB SUPERNOVAE; EMISSION; M81; SUPERGIANT; DISCOVERY AB The Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Observatory observed SN 1993J during three intervals centered approximately 12, 30, and 108 days after its outburst. Hard X-ray emission was detected in the first two of these intervals. No emission was seen in the third observation or in two earlier observations in 1991 and 1992. The coincidence of the observed excess with the outburst of SN 1993J and the consistency of the spectra and time evolution with those seen at lower energies by ROSAT and ASCA (Astro-D) argue that the observed emission is indeed from SN 1993J. It is probably due to the interaction of the fast supernova ejecta with circumstellar material. The luminosity, 5 x 10(40) ergs s-1 (50-150 keV) in the first interval, is significantly larger than predicted. Extrapolating the spectrum to a few keV accounts for most or all of the observed emission at low energy. The observed high temperature, 10(9) K, is easily obtained in the shocked circumstellar matter, but a surprisingly high density is required there to give the observed luminosity, and little or no additional X-ray emission from denser shocked supernova ejecta is allowed. The hard emission might also be explained in terms of the shocked supernova ejecta itself with unexpectedly high temperature. C1 UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60201. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP LEISING, MD (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. RI Johnson, Neil/G-3309-2014 NR 27 TC 33 Z9 33 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1994 VL 431 IS 2 BP L95 EP L98 DI 10.1086/187481 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PC149 UT WOS:A1994PC14900007 ER PT J AU CONNOR, BJ SISKIND, DE TSOU, JJ PARRISH, A REMSBERG, EE AF CONNOR, BJ SISKIND, DE TSOU, JJ PARRISH, A REMSBERG, EE TI GROUND-BASED MICROWAVE OBSERVATIONS OF OZONE IN THE UPPER-STRATOSPHERE AND MESOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID DIURNAL-VARIATIONS; MIDDLE ATMOSPHERE; TEMPERATURE; RADIOMETRY; PROFILES AB A 9-month-long series of measurements of ozone in the upper stratosphere and mesosphere is reported. The measurements are presented as monthly averages of profiles in blocks of roughly 20 min local time and as night-to-day ratios. An error analysis predicts accuracies of 5-26% for the monthly profiles and 2.5-9% for the ratios. The data are compared to historical data from SME and limb infrared monitor of the stratosphere (LIMS), and it is shown how to remove the effect of different vertical resolution from the comparisons. The microwave data typically agree to better than 10% with SME and nighttime LIMS ozone at all altitudes below the 0.1-mbar surface. Comparison of the microwave night-to-day ratio with the corresponding ratio from LIMS suggests that nonlocal thermodynamic equilibrium effects in the LIMS daytime data exceed 10% at all pressures less than or equal to 1 mbar. C1 LOCKHEED ENGN & SCI CO, HAMPTON, VA 23666 USA. UNIV MASSACHUSETTS, AMHERST, MA 01003 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP CONNOR, BJ (reprint author), NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23681 USA. NR 24 TC 92 Z9 92 U1 2 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD AUG 20 PY 1994 VL 99 IS D8 BP 16757 EP 16770 DI 10.1029/94JD01153 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PC944 UT WOS:A1994PC94400036 ER PT J AU GEORGE, C LAHTI, PM MODARELLI, DA INCELI, A AF GEORGE, C LAHTI, PM MODARELLI, DA INCELI, A TI SUBSTITUTED DIPHENYL OXALATES SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The ethanedioic acid (oxalic acid) diphenyl ester derivative with bis(2,6-tert-butyl) substitution, bis(2, 6-di-tert-butyl-4-methoxyphenyl) ethanedioate, C32H46O6(3), adopts an s-trans oxalate conformation due to steric constraints; such derivatives constitute conformationally well defined molecular structural units. Diphenyl ethanedioate, C14H10O4 (1), has approximate s-cis geometry and diphenyl ethanedioate with tert-butylation on only one ring, 1-(2,4, 6-tris-tert-butylphenyl) 2-phenyl ethanedioate, C26H34O4(2), has a gauche conformation. C1 UNIV MASSACHUSETTS,DEPT CHEM,AMHERST,MA 01003. RP GEORGE, C (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 7 TC 3 Z9 3 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD AUG 15 PY 1994 VL 50 BP 1308 EP 1312 DI 10.1107/S0108270193012235 PN 8 PG 5 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA PF986 UT WOS:A1994PF98600055 ER PT J AU WAYTENA, GL HOFF, HA VOLD, CL BROUSSARD, PR CLAASSEN, JH CESTONE, VC SPRAGUE, JA AF WAYTENA, GL HOFF, HA VOLD, CL BROUSSARD, PR CLAASSEN, JH CESTONE, VC SPRAGUE, JA TI EXPERIMENTAL-EVIDENCE OF RESPUTTERING OF THE YTTRIA LAYER IN A YBA2CU3O7-X Y2O3 YBA2CU3O7-X TRILAYER FILM SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID YBA2CU3OX THIN-FILMS; CRITICAL-CURRENT-DENSITY; ELECTRON-MICROSCOPY; Y2O3 INCLUSIONS; GROWTH; THERMALIZATION; TEMPERATURE; ANISOTROPY; ATOMS AB Using transmission electron microscopy and energy dispersive x-ray spectroscopy analysis, the microstructure and composition of a YBa2Cu3O7-x/Y2O3/YBa2Cu3O7-x trilayer film deposited on MgO by off-axis sputtering at 670-degrees-C and 100 mTorr was investigated. The YBa2Cu3O7-x layer in contact with the substrate was found to be mainly single phase. However, the top YBa2Cu3O7-x layer was embedded with 5-10 nm crystalline Y2O3 (yttria) particles, which disturbed the local microstructure. The top YBa2Cu3O7-x layer also had barium copper oxide particles covering its surface. The partial decomposition of the top YBa2Cu3O7-x layer may have been due to resputtering of the yttria layer which locally altered the deposition conditions. In particular, the oxygen pressure in the vicinity of the growing film may have increased due to sputtering of the yttria layer by plasma gas atoms and the sputtered target atoms. As a result, deposition occurred under conditions away from the thermodynamic stability line. RP WAYTENA, GL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 35 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1994 VL 76 IS 4 BP 2380 EP 2386 DI 10.1063/1.357585 PG 7 WC Physics, Applied SC Physics GA PC021 UT WOS:A1994PC02100059 ER PT J AU PAWLIKOWSKI, GT BRADY, RF AF PAWLIKOWSKI, GT BRADY, RF TI PREPARATION AND THERMAL-PROPERTIES OF ACRYLIC POLYMERS WITH PENDANT SPIROBISLACTONE GROUPS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID SHRINKAGE; RESINS AB A series of acrylic terpolymers containing varying concentrations of crosslinkable glycidyl, spirobislactone, and hydroxyl pendant groups was prepared by radical chain polymerization. The glass-transition temperatures and weight average molecular weights of the terpolymers span broad ranges and can be independently selected by control of monomer composition. Cross-linking at 210-degrees-C was monitored by infrared spectroscopy. The rate and extent of reaction of spirobislactone groups were found to be greater than those for glycidyl groups. The activation energies of the spirobislactone and glycidyl reactions in the range between 160 and 210-degrees-C were calculated by Arrhenius treatment of the curing kinetics and found to be 31.0 +/- 1.1 kJ mol-1 and 59.1 +/- 1.2 kJ mol-1, respectively. The double ring opening reaction of the spirobislactone groups has no effect on the volume of the cross-linked polymers. (C) 1994 John Wiley & Sons, Inc. C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 14 TC 6 Z9 6 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD AUG 15 PY 1994 VL 53 IS 7 BP 899 EP 914 DI 10.1002/app.1994.070530706 PG 16 WC Polymer Science SC Polymer Science GA NY063 UT WOS:A1994NY06300006 ER PT J AU XIE, LK BUCKLEY, LJ JOSEFOWICZ, JY AF XIE, LK BUCKLEY, LJ JOSEFOWICZ, JY TI OBSERVATIONS OF POLYANILINE SURFACE-MORPHOLOGY MODIFICATION DURING DOPING AND DE-DOPING USING ATOMIC-FORCE MICROSCOPY SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID SCANNING TUNNELING MICROSCOPY; CONDUCTING POLYMER; FILMS; RESOLUTION; BATTERY AB Chemically synthesized 30 mum thick polyaniline films were studied during the doping and de-doping process by imaging the polymer surface using in situ atomic force microscopy (AFM). The polymer, which was initially in the base non-conducting form, was doped using aqueous solutions of both tosylic acid (pH = 0.2) and HCI (pH = 0.2 and 1.0). De-doping was accomplished by exposing the same doped polymer surface to NH4OH (pH = 12) base solution. AFM images showed that it was necessary to cycle the polymer surface three times between acid and base before a reproducible surface morphology was established. For the case of doping with tosylic acid, AFM images showed that the polyaniline surface was immediately roughened; the changes in mean roughness for the base and acid conditions were approximately 5.4 and approximately 6.7 nm, respectively. In addition there appeared to be an increase in the size of surface channels and cracks. When doping with HCI (pH = 1.0), no change in surface morphology was observed; however, noticeable surface roughening occurred over 10 min for the case of the lower pH = 0.2 solution; mean roughness changes for the base and acid conditions were approximately 1 7.9 and 39.2 nm. Radio frequency measurements, which determined the polymer complex permittivity, and d.c. conductivity measurements were used to determine the level of doping in the samples studied by AFM which were exposed to acid solutions. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP XIE, LK (reprint author), UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104, USA. NR 19 TC 17 Z9 17 U1 0 U2 4 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD AUG 15 PY 1994 VL 29 IS 16 BP 4200 EP 4204 DI 10.1007/BF00414199 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA PD445 UT WOS:A1994PD44500008 ER PT J AU TRAN, P MARADUDIN, AA AF TRAN, P MARADUDIN, AA TI THE SCATTERING OF ELECTROMAGNETIC-WAVES FROM A RANDOMLY ROUGH 2D METALLIC SURFACE SO OPTICS COMMUNICATIONS LA English DT Article ID KIRCHHOFF APPROXIMATION; NUMERICAL-SIMULATION; SCALAR BEAM; HARD-WALL; BACKSCATTERING AB By a computer simulation approach we study the scattering of a finite beam of p-polarized light from very rough two-dimensional metallic surfaces. Enhanced backscattering is observed. It is found that the approximation of a metal surface by a perfectly conducting surface in the visible region of the optical spectrum is less good for in-plane, co-polarized and out-of-plane, crossed-polarized scattering than it is for in-plane, crossed-polarized and out-of-plane, co-polarized scattering. C1 UNIV CALIF IRVINE, DEPT PHYS, IRVINE, CA 92717 USA. UNIV CALIF IRVINE, INST SURFACE & INTERFACE SCI, IRVINE, CA 92717 USA. RP USN, CTR AIR WARFARE, DIV WEAPONS, CODE C02313, CHINA LAKE, CA 93555 USA. NR 13 TC 43 Z9 43 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 EI 1873-0310 J9 OPT COMMUN JI Opt. Commun. PD AUG 15 PY 1994 VL 110 IS 3-4 BP 269 EP 273 DI 10.1016/0030-4018(94)90424-3 PG 5 WC Optics SC Optics GA PB466 UT WOS:A1994PB46600004 ER PT J AU MOON, JA MAHON, R DUNCAN, MD REINTJES, J AF MOON, JA MAHON, R DUNCAN, MD REINTJES, J TI 3-DIMENSIONAL REFLECTIVE IMAGE-RECONSTRUCTION THROUGH A SCATTERING MEDIUM BASED ON TIME-GATED RAMAN AMPLIFICATION SO OPTICS LETTERS LA English DT Article AB We present reconstructions of a three-dimensional object imaged in reflection mode through a turbid medium, using time-gated Raman amplification. We demonstrate a less than 1-cm depth resolution at a laser-power-limited viewing distance of 8.5 attenuation lengths from an object with a rough metallic surface. We show that, even at a viewing distance of 10.5 attenuation lengths, the imaging system is power limited rather than backscatter limited. C1 JAYCOR,VIENNA,VA 22108. RP MOON, JA (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 5640,WASHINGTON,DC 20375, USA. NR 11 TC 36 Z9 36 U1 1 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 1994 VL 19 IS 16 BP 1234 EP 1236 DI 10.1364/OL.19.001234 PG 3 WC Optics SC Optics GA PA201 UT WOS:A1994PA20100018 PM 19855480 ER PT J AU FRANKEL, MY AF FRANKEL, MY TI OPTIMIZATION OF A FEMTOSECOND ELLIPSOMETER FOR GOLD PHOTOREFLECTANCE STUDIES SO OPTICS LETTERS LA English DT Article ID DYNAMICS; FILMS; GAAS; GE AB I develop a quantitative optimization procedure for femtosecond reflectance ellipsometer measurements. The femtosecond ellipsometer eliminates the need for separate thin-film reflectance and transmittance measurements and allows self-consistent determination of dielectric index changes of optically thick films on arbitrary substrates. I verify the optimization procedure and use the femtosecond ellipsometric measurements to investigate the photoreflectance of an optically thick gold film. A comparison of the extracted real and imaginary dielectric function components reveals evidence of thermalized and nonthermalized hot-electron populations. RP FRANKEL, MY (reprint author), USN,RES LAB,CODE 5670,WASHINGTON,DC 20375, USA. NR 14 TC 4 Z9 4 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 1994 VL 19 IS 16 BP 1252 EP 1254 DI 10.1364/OL.19.001252 PG 3 WC Optics SC Optics GA PA201 UT WOS:A1994PA20100024 PM 19855486 ER PT J AU SINKOVITS, RS AF SINKOVITS, RS TI SCALING RELATIONS FOR THE SLIPPERY BALLISTIC GROWTH-MODEL SO PHYSICA A LA English DT Article ID BEAM EPITAXIAL-GROWTH; SURFACE-DIFFUSION; KINETIC GROWTH; DEPOSITION; PERCOLATION; AGGREGATION AB A slippery ballistic growth model is introduced in which deposited particles stick with probability p(s) to the sides of existing columns. Numerical simulations in 1 + 1 dimensions show that while this model belongs to the KPZ universality class, it also exhibits a short-time scaling regime during which the width of the growth region obeys the power law w approximately t1/2 before crossing over to KPZ behavior. The crossover times between the three scaling regimes both scale with sticking probability as p(s)-1. The interface width at saturation w(s) is found to scale with p(s), in addition to its scaling with substrate size. RP SINKOVITS, RS (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD AUG 15 PY 1994 VL 209 IS 1-2 BP 1 EP 8 DI 10.1016/0378-4371(94)90046-9 PG 8 WC Physics, Multidisciplinary SC Physics GA PC414 UT WOS:A1994PC41400001 ER PT J AU VELIADIS, JVD KHURGIN, JB DING, YJ CUI, AG KATZER, DS AF VELIADIS, JVD KHURGIN, JB DING, YJ CUI, AG KATZER, DS TI INVESTIGATION OF THE PHOTOLUMINESCENCE-LINEWIDTH BROADENING IN PERIODIC MULTIPLE NARROW ASYMMETRIC COUPLED QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID ROOM-TEMPERATURE; GAAS; RECOMBINATION; ABSORPTION; EXCITONS; DYNAMICS AB Photoluminescence spectra were measured as a function of temperature and excitation intensity in two periodic multiple narrow asymmetric coupled quantum-well structures. The peaks of the spectra have been identified and the temperature-dependent natures of the recombination processes have been determined. The half-widths at half maximum of the line shapes were deduced by fitting the low-energy sides to Gaussian functions. The excellent fits indicate that inhomogeneous broadening is dominant. The rate at which the linewidth broadens with temperature is more dramatic below 140 K due to the sharp changes of the ionized impurity and of the longitudinal-optical-phonon scattering mechanisms. Above 140 K, the linewidth has a linear dependence on temperature due to the thermal excitation of the longitudinal optical phonons. By using the model proposed by Lee et al. we have determined the scattering rates of the longitudinal acoustic and optical phonons, of the impurities, and of the inhomogeneous broadening. Our results show that unless the growth is interrupted at each interface, the inhomogeneous broadening remains dominant up to room temperature. Measurement of the temperature dependence of the photoluminescence linewidth proves to be a simple and effective technique to investigate the scattering mechanisms of the photogenerated carriers and the origins of the emission peak's linewidth broadening in these structures. C1 BOWLING GREEN STATE UNIV,DEPT PHYS & ASTRON,BOWLING GREEN,OH 43403. BOWLING GREEN STATE UNIV,CTR PHOTOCHEM SCI,BOWLING GREEN,OH 43403. USN,RES LAB,WASHINGTON,DC 20375. RP VELIADIS, JVD (reprint author), JOHNS HOPKINS UNIV,DEPT ELECT & COMP ENGN,BALTIMORE,MD 21218, USA. RI khurgin, Jacob/A-3278-2010; Katzer, D. Scott/N-7841-2013 NR 25 TC 10 Z9 11 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1994 VL 50 IS 7 BP 4463 EP 4469 DI 10.1103/PhysRevB.50.4463 PG 7 WC Physics, Condensed Matter SC Physics GA PD753 UT WOS:A1994PD75300024 ER PT J AU FU, LP LEE, ST PETROU, A WARNOCK, J JONKER, BT AF FU, LP LEE, ST PETROU, A WARNOCK, J JONKER, BT TI COMPARISON OF THE SPIN SPLITTINGS BETWEEN THE E(1)H(1) AND E(2)H(2) EXCITONS IN A ZNSE/ZN0.85MN0.15SE MULTIPLE-QUANTUM-WELL STRUCTURE SO PHYSICAL REVIEW B LA English DT Article ID SUPERLATTICES AB We present a magnetoreflectivity study of a ZnSe/Zn-0.85/Mn0.15Se multiple-quantum-well structure. The spin splittings of the two confined excitons e(1)h(1) and e(2)h(2) are studied as a function of applied magnetic field. Differences in the energies and intensities between the two excitonic transitions are discussed and interpreted using a variational calculation. We show that these diluted-magnetic-semiconductor-based structures may be interesting hosts for the study of heavy-hole/light-hole band mixing, as the energies of the confinement hole states change with the application of an external magnetic field. C1 IBM CORP, DIV RES, THOMAS J WATSON RES CTR, YORKTOWN HTS, NY 10598 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP FU, LP (reprint author), SUNY BUFFALO, DEPT PHYS, BUFFALO, NY 14260 USA. NR 12 TC 1 Z9 1 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1994 VL 50 IS 7 BP 4696 EP 4700 DI 10.1103/PhysRevB.50.4696 PG 5 WC Physics, Condensed Matter SC Physics GA PD753 UT WOS:A1994PD75300053 ER PT J AU QUONG, AA PEDERSON, MR BROUGHTON, JQ AF QUONG, AA PEDERSON, MR BROUGHTON, JQ TI BORON HYDRIDE ANALOGS OF THE FULLERENES SO PHYSICAL REVIEW B LA English DT Article ID NONLOCAL PSEUDOPOTENTIAL APPROACH; MOLECULES; CARBON; SOLIDS; POLARIZABILITIES; SIMULATIONS; EXAMPLES; SYSTEMS; CLUSTER; DIAMOND AB The BH moiety is isoelectronic with C. We have studied the stability of the (BH)(60) analogue of the C-60 fullerene as well as the dual-structure (BH)(32) icosahedron, both of them being putative structures, by performing local-density-functional electronic calculations. To aid in our analysis, we have also studied other homologues of these systems. We find that the latter, i.e., the dual structure, is the more stable although the former is as stable as one of the latter's lower homologues. Boron hydrides, it seems, naturally form the dual structures used in algorithmic optimization of complex fullerene systems. Fully relaxed geometries are reported as well as electron affinities and effective Hubbard U parameters. These systems form very stable anions and we conclude that a search for BH analogues of the C-60 alkali-metal supeconductors might prove very fruitful. C1 USN,RES LAB,WASHINGTON,DC 20375. RP QUONG, AA (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 38 TC 24 Z9 25 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1994 VL 50 IS 7 BP 4787 EP 4794 DI 10.1103/PhysRevB.50.4787 PG 8 WC Physics, Condensed Matter SC Physics GA PD753 UT WOS:A1994PD75300064 ER PT J AU CHU, E VOELLER, DM MORRISON, PF JONES, KL TAKECHI, T MALEY, GF MALEY, F ALLEGRA, CJ AF CHU, E VOELLER, DM MORRISON, PF JONES, KL TAKECHI, T MALEY, GF MALEY, F ALLEGRA, CJ TI THE EFFECT OF REDUCING REAGENTS ON BINDING OF THYMIDYLATE SYNTHASE PROTEIN TO THYMIDYLATE SYNTHASE MESSENGER-RNA SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID OXIDATION-REDUCTION; REDOX REGULATION; COAT PROTEIN; SYNTHETASE; SEQUENCE; SITE; DNA; INVITRO; BACTERIOPHAGE-T4; TRANSLATION AB Human thymidylate synthase (TS) protein specifically binds to its own TS mRNA and functions as a translational repressor. In the presence of reducing agents, the RNA binding activity of TS protein is significantly enhanced. In contrast, treatment of TS protein with the oxidizing agent diamide inhibits RNA binding. Scatchard analysis reveals that in the presence of the reducing agent 2-mercaptoethanol, the TS protein/TS mRNA interaction changes from low (K-d = 66 nM) to high (K-d = 2.6 nM) apparent affinity. The catalytic activity of TS is increased by up to 6.5-fold in the presence of 2-mercaptoethanol. These studies demonstrate that the interaction between TS protein and its target TS mRNA is sensitive to the presence of reducing reagents and is dependent upon a reversible sulfhydryl switch mechanism. C1 NEW YORK STATE DEPT HLTH,WADSWORTH CTR LABS & RES,ALBANY,NY 12201. RP CHU, E (reprint author), USN HOSP,NCI,NAVY MED ONCOL BRANCH,BLDG 8,RM 5101,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 38 TC 34 Z9 35 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD AUG 12 PY 1994 VL 269 IS 32 BP 20289 EP 20293 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PB317 UT WOS:A1994PB31700015 PM 8051122 ER PT J AU JACKSON, K KAXIRAS, E PEDERSON, MR AF JACKSON, K KAXIRAS, E PEDERSON, MR TI BONDING OF ENDOHEDRAL ATOMS IN SMALL CARBON FULLERENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ICOSAHEDRAL C-60; C60 CAGE; COMPLEXES; C-28; STABILIZATION; STABILITY; MOLECULES; CLUSTERS; STATES; C-70 AB We present a simple model for understanding the bonding of endohedral atoms in small fullerene cages, based on their approximate spherical shape. Previous work has shown that the one-electron wave functions of a fullerene cage can be assigned angular momentum quantum numbers which describe their overall angular character. These quantum numbers form the basis for approximate selection rules which govern the bonding with endohedral atoms. With this model we successfully address the very different bonding of various tetravalent elements in C-28 and the remarkably strong bonding of U in this small fullerene. We also make several specific predictions regarding the stability of other endohedral complexes. C1 HARVARD UNIV, DEPT PHYS, CAMBRIDGE, MA 02138 USA. HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP CENT MICHIGAN UNIV, DEPT PHYS, MT PLEASANT, MI 48859 USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 36 TC 40 Z9 40 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 11 PY 1994 VL 98 IS 32 BP 7805 EP 7810 DI 10.1021/j100083a010 PG 6 WC Chemistry, Physical SC Chemistry GA PC247 UT WOS:A1994PC24700010 ER PT J AU KO, SH AF KO, SH TI SOUND-WAVE PROPAGATION IN A 2-DIMENSIONAL FLEXIBLE DUCT IN THE PRESENCE OF AN INVISCID FLOW SO JOURNAL OF SOUND AND VIBRATION LA English DT Article AB An investigation is made of the phase velocity of the sound wave propagating in a two-dimensional flexible duct that carries a uniform flow. The flexible duct considered herein is composed of two parallel, thin clastic plates. The outer surfaces of the duct are in contact with a stationary fluid medium and its inside contains a uniform fluid flow. An eigenvalue problem is formulated for a two-dimensional flexible duct by satisfying pertinent boundary conditions across the fluid-plate interfaces. The sound pressure inside the duct is a summation of partial wave pressures, each of which is associated with a wave mode having its own phase velocity. RP KO, SH (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT,NEW LONDON,CT 06320, USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-460X J9 J SOUND VIB JI J. Sound Vibr. PD AUG 11 PY 1994 VL 175 IS 2 BP 279 EP 287 DI 10.1006/jsvi.1994.1328 PG 9 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA PB315 UT WOS:A1994PB31500010 ER PT J AU IDZERDA, YU CHEN, CT LIN, HJ MEIGS, G HO, GH KAO, CC AF IDZERDA, YU CHEN, CT LIN, HJ MEIGS, G HO, GH KAO, CC TI SOFT-X-RAY MAGNETIC CIRCULAR-DICHROISM AND MAGNETIC-FILMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th National Conference on Synchrotron Radiation Instrumentation CY AUG 23-26, 1993 CL NIST, GAITHERSBURG, MD HO NIST ID FE/CR/FE TRILAYERS; ABSORPTION; NICKEL AB Soft X-ray magnetic circular dichroism is the difference in the total absorption cross-section of positive and negative helicity circularly-polarized soft X-rays at the magnetically interesting L2 and L3 absorption edges of 3d tranSition metals or the M4 and M5 absorption edges of the rare earths. The absorption edges can be measured using a variety of techniques including transmission, partial electron yield, total electron yield, partial fluorescence yield, sample current, and reflection. The different measurement schemes represent different probing depths, allowing depth dependent studies, and are complementary to each other. A description of the relative merits of the various measurement schemes is presented. In addition, complications such as beam instability, saturation effect, and incident beam Bragg scattering into the detectors are discussed. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 48 Z9 49 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 11 PY 1994 VL 347 IS 1-3 BP 134 EP 141 DI 10.1016/0168-9002(94)91869-4 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PD429 UT WOS:A1994PD42900026 ER PT J AU GUARDALA, NA PRICE, JL LAND, DJ SIMONS, DG LEE, DH JOHNSON, BM GLASS, GA BRENNAN, JG AF GUARDALA, NA PRICE, JL LAND, DJ SIMONS, DG LEE, DH JOHNSON, BM GLASS, GA BRENNAN, JG TI COMPTON-ELECTRON SPECTROSCOPY USING HIGH-ENERGY SYNCHROTRON X-RAYS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 8th National Conference on Synchrotron Radiation Instrumentation CY AUG 23-26, 1993 CL NIST, GAITHERSBURG, MD HO NIST ID SCATTERING AB Compton-recoil electron spectra have been measured using high-energy (46 and 56 keV) synchrotron X-rays produced at the National Synchrotron Light Source. Thin foils of C and Al (< 1500 angstrom thick) were used as targets. The emitted electrons were detected at 0-degrees-C with respect to the incident photon beam using an electrostatic analyzer with an overall energy resolution of approximately 3%. C1 USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV SW LOUISIANA,LAFAYETTE,LA 70504. CATHOLIC UNIV AMER,WASHINGTON,DC 20064. NR 11 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 11 PY 1994 VL 347 IS 1-3 BP 504 EP 506 DI 10.1016/0168-9002(94)91937-2 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PD429 UT WOS:A1994PD42900094 ER PT J AU PHUVAN, SL AF PHUVAN, SL TI OPTICAL IMPLEMENTATION OF N-WAVELET CODING FOR PATTERN-CLASSIFICATION SO APPLIED OPTICS LA English DT Article ID TRANSFORM AB A novel method, N-wavelet coding, for pattern detection and classification based on wavelet transform and coding theory is introduced. With this detection and classification technique it is possible to reduce the false-alarm rate while maintaining a constant probability of detection and noise level. A set of periodic continuous waveforms comprising six classes that span a cross-correlation coefficient between 0.68 and 0.99 is used to evaluate the N-wavelet coding technique. It is found that when the length N of the N-wavelet coding is increased it is possible to decrease the false-alarm rate while maintaining a constant probability of detection. RP PHUVAN, SL (reprint author), USN, CTR SURFACE WARFARE, DAHLGREN DIV, WHITE OAK DETACHMENT, 10901 NEW HAMPSHIRE AVE, SILVER SPRING, MD 20903 USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD AUG 10 PY 1994 VL 33 IS 23 BP 5294 EP 5302 PG 9 WC Optics SC Optics GA PD325 UT WOS:A1994PD32500009 PM 20935919 ER PT J AU DEYOUNG, JA SCHMIDT, RE AF DEYOUNG, JA SCHMIDT, RE TI THE PHOTOMETRIC PERIOD OF V1974 CYGNI (NOVA CYGNI 1992) SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; NOVAE, CATACLYSMIC VARIABLES; STARS, INDIVIDUAL, (V1974 CYGNI) ID NEON NOVA; NOVA-CYGNI-1992; OUTBURST AB We present the discovery of the photometric (orbital) period for V1974 Cygni (Nova Cygni 1992). The orbital period of 0.081263 +/- 0.000003 days places this classical nova just below the catalysmic variable (CV) period gap. The modulation is driven by irradiation by the white dwarf (WD) heating one hemisphere of the red secondary and its aspect changes during orbital revolution. RP DEYOUNG, JA (reprint author), USN OBSERV,DEPT TIME SERV,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 20 TC 20 Z9 20 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 10 PY 1994 VL 431 IS 1 BP L47 EP L49 DI 10.1086/187469 PN 2 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NZ979 UT WOS:A1994NZ97900012 ER PT J AU SKIBO, JG DERMER, CD RAMATY, R AF SKIBO, JG DERMER, CD RAMATY, R TI COMPTON-SCATTERING IN JETS - A MECHANISM FOR SIMILAR-TO-0.4 AND LESS-THAN-OR-EQUAL-TO-0.2 MEV LINE PRODUCTION SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA RAYS, THEORY; RADIATION MECHANISMS, NONTHERMAL; BLACK HOLE PHYSICS; LINE, FORMATION ID GALACTIC-CENTER REGION; POSITRON-ANNIHILATION RADIATION; GAMMA-RAY LINES; CENTER DIRECTION; BLACK-HOLE; NOVA; 1E1740.7-2942; EMISSION; MUSCA AB We show that gamma-ray line emission at approximately 0.4 and less than or similar to 0.2 MeV can be produced by Compton scattering of beamed radiation in the jets of Galactic black hole candidates. This mechanism has the novel feature of not invoking the presence of e+-e- pairs. To produce the two lines, we employ a symmetric double-sided jet with bulk flow velocity of about 0.5c and incident beam radiation with a hard energy spectrum. We show that the two lines can be seen at viewing-angle cosines relative to the jet ranging from 0.2 to 0.6. This comprises 40% of the total solid angle. In addition, the line radiation is approximately 10% polarized. Depending on the bulk flow and viewing angle, the model can produce lines at other energies as well. In particular, a broad feature near 1 MeV can be seen by viewing the jet close to its axis. Our model can also accommodate single-line spectra if the beamed gamma-ray emission or the jets themselves are asymmetric. C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. RP SKIBO, JG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,NRC,WASHINGTON,DC 20375, USA. NR 25 TC 11 Z9 11 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 10 PY 1994 VL 431 IS 1 BP L39 EP L42 DI 10.1086/187467 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NZ979 UT WOS:A1994NZ97900010 ER PT J AU OLSON, PE WALLACE, MR AF OLSON, PE WALLACE, MR TI MEASUREMENT OF CD4+ PERCENTAGE SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Letter RP OLSON, PE (reprint author), USN,MED CTR,SAN DIEGO,CA 92152, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD AUG 10 PY 1994 VL 272 IS 6 BP 434 EP 434 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA PA278 UT WOS:A1994PA27800016 PM 7913729 ER PT J AU MASCOLA, JR MCNEIL, JG BURKE, DS AF MASCOLA, JR MCNEIL, JG BURKE, DS TI AIDS VACCINES - ARE WE READY FOR HUMAN EFFICACY TRIALS SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Editorial Material ID FELINE LEUKEMIA-VIRUS; CHIMPANZEES; INFECTION; PROTECTION; HIV-1; GP120 C1 USN,MED RES INST,DEPT INFECT DIS,BETHESDA,MD. RP MASCOLA, JR (reprint author), WALTER REED ARMY INST RES,DIV RETROVIROL,1600 E GUDE DR,ROCKVILLE,MD 20850, USA. OI /0000-0002-5704-8094 NR 15 TC 14 Z9 14 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD AUG 10 PY 1994 VL 272 IS 6 BP 488 EP 489 DI 10.1001/jama.272.6.488 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA PA278 UT WOS:A1994PA27800033 PM 8040986 ER PT J AU GODBEY, DJ LILL, JV DEPPE, J HOBART, KD AF GODBEY, DJ LILL, JV DEPPE, J HOBART, KD TI GE SURFACE SEGREGATION AT LOW-TEMPERATURE DURING SIGE GROWTH BY MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID GA SELF-ORGANIZATION; KINETICS SIMULATION; BURIED LAYER AB The temperature dependence of germanium surface segregation during growth by solid source SiGe molecular beam epitaxy (MBE) was studied by x-ray photoelectron spectroscopy and kinetic Monte Carlo (KMC) modeling. Germanium segregation persisted at temperatures 60-degrees-C below that predicted by a two-state exchange model. KMC simulations, where film growth, surface diffusion, and surface segregation are modeled consistently, successfully describe the low temperature segregation of germanium. Realistic descriptions of MBE must follow the physical rates of the growth, surface diffusion, and surface segregation processes. C1 SFA INC,LANDOVER,MD 20785. RP GODBEY, DJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 45 Z9 45 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 8 PY 1994 VL 65 IS 6 BP 711 EP 713 DI 10.1063/1.112277 PG 3 WC Physics, Applied SC Physics GA PA919 UT WOS:A1994PA91900020 ER PT J AU SZPAK, S MOSIERBOSS, PA BOSS, RD SMITH, JJ AF SZPAK, S MOSIERBOSS, PA BOSS, RD SMITH, JJ TI COMMENTS ON THE ANALYSIS OF TRITIUM CONTENT IN ELECTROCHEMICAL-CELLS SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article AB Expressions are given for the tritium distribution between gas and liquid phases arising from prolonged electrolysis of D2O on Pd electrodes saturated with absorbed deuterium. Errors associated with commonly employed experimental procedures and their interpretation using a simple model for the distribution between the gas and liquid phases are evaluated. With regard to tritium production, an unambiguous resolution requires a complete mass balance. Conclusions based on partial data, such as the measurement of the tritium content in a single cell component (e.g. electrode, electrolyte or ''electrolytic'' gas phase), may be misleading, particularly if production rates are either low or intermittent. C1 US DOE,WASHINGTON,DC 20585. RP SZPAK, S (reprint author), USN,CTR CONTROL & OCEAN SURVEILLENCE,DIV RDT & E,SAN DIEGO,CA 92152, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD AUG 8 PY 1994 VL 373 IS 1-2 BP 1 EP 9 DI 10.1016/0022-0728(94)03302-1 PG 9 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA PB510 UT WOS:A1994PB51000001 ER PT J AU KAXIRAS, E JACKSON, K PEDERSON, MR AF KAXIRAS, E JACKSON, K PEDERSON, MR TI THEORETICAL-STUDY OF PASSIVATED SMALL FULLERENES C24X4 (X=N, P, AS) AND THEIR ISOELECTRONIC EQUIVALENTS (BN)12X4 SO CHEMICAL PHYSICS LETTERS LA English DT Article ID COMPLEXES; SURFACE; C-60; C-28; C28 AB We present a first-principles theoretical study of complexes formed by combination of C rings and group-V atoms, which are the passivated analogs of the C28 fullerene. We study structural and electronic properties of C24X4 clusters, with X = N, P, As, in comparison to C28 and C28H4. All clusters with group-V atoms are predicted to be stable and chemically passive, with large HOMO-LUMO gaps. The conditions under which these clusters may be formed experimentally are considered. We also study the (BN)12N4 cluster, an isoelectronic equivalent Of C28N4, and find a particularly stable and chemically passive isomer. C1 HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. CENT MICHIGAN UNIV, DEPT PHYS, MT PLEASANT, MI 48859 USA. USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP HARVARD UNIV, DEPT PHYS, CAMBRIDGE, MA 02138 USA. NR 21 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 EI 1873-4448 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD AUG 5 PY 1994 VL 225 IS 4-6 BP 448 EP 453 DI 10.1016/0009-2614(94)87110-8 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PB644 UT WOS:A1994PB64400027 ER PT J AU GOLDBERG, L MEHUYS, D AF GOLDBERG, L MEHUYS, D TI BLUE-LIGHT INTENSITY MODULATION IN A FREQUENCY-DOUBLED TAPERED AMPLIFIER MODELOCKED LASER SO ELECTRONICS LETTERS LA English DT Article DE SEMICONDUCTOR JUNCTION LASERS; LASER CAVITY RESONATORS; LASER MODE LOCKING; OPTICAL HARMONIC GENERATION ID HIGH-POWER; DIODE AB Blue light, generated by frequency doubling of a modelocked compound cavity laser based on a tapered GaAlAs amplifier, is modulated by varying the RF modelocking signal amplitude. Switching times are approximately 20ns. C1 SDL INC,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 1 Z9 1 U1 1 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD AUG 4 PY 1994 VL 30 IS 16 BP 1296 EP 1297 DI 10.1049/el:19940907 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA PC862 UT WOS:A1994PC86200028 ER PT J AU KRUPPA, W BOOS, JB AF KRUPPA, W BOOS, JB TI LOW-TEMPERATURE CHARACTERISTICS OF 0.35-MU-M ALSB/INAS HEMTS SO ELECTRONICS LETTERS LA English DT Article DE HIGH ELECTRON MOBILITY TRANSISTORS; IMPACT IONIZATION; CRYOGENICS AB The effects of low temperature on the characteristics of 0.35mum gate-length AlSb/InAs HEMTS are reported. Measurements down to 15K reveal an increase in transconductance and low-field source-drain conductance. The commonly-observed impact ionisation and its associated gate current were found to decrease significally at low temperature apparently due to a increase in bandgap. C1 SFA INC,LANDOVER,MD 20785. RP KRUPPA, W (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD AUG 4 PY 1994 VL 30 IS 16 BP 1358 EP 1359 DI 10.1049/el:19940908 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA PC862 UT WOS:A1994PC86200069 ER PT J AU JACOBS, GA HURLBURT, HE KINDLE, JC METZGER, EJ MITCHELL, JL TEAGUE, WJ WALLCRAFT, AJ AF JACOBS, GA HURLBURT, HE KINDLE, JC METZGER, EJ MITCHELL, JL TEAGUE, WJ WALLCRAFT, AJ TI DECADE-SCALE TRANS-PACIFIC PROPAGATION AND WARMING EFFECTS OF AN EL-NINO ANOMALY SO NATURE LA English DT Article ID OCEAN RESPONSE; TEMPERATURES; MODEL AB El Nino events in the Pacific Ocean can have significant local effects lasting up to two years. For example the 1982-83 El Nino caused increases in the sea-surface height and temperature at the coasts of Ecuador and Peru(1), with important consequences for fish populations(2,3) and local rainfall(4). But it has been believed that the long-range effects of El Nino events are restricted to changes transmitted through the atmosphere, for example causing precipitation anomalies over the Sahel(5). Here we present evidence from modelling and observations that planetary-scale oceanic waves, generated by reflection of equatorial shallow-water waves from the American coasts during the 1982-83 El Nino, have crossed the North Pacific and a decade later caused northward re-routing of the Kuroshio Extension-a strong current that normally advects large amounts of heat from the southern coast of Japan eastwards into the mid-latitude Pacific. This has led to significant increases in sea surface temperature at high latitudes in the northwestern Pacific, of the same amplitude and with the same spatial extent as those seen in the tropics during important El Nino events. These changes may have influenced weather patterns over the North American continent during the past decade, and demonstrate that the oceanic effects of El Nino events can be extremely long-lived. C1 UNIV COLORADO,COLORADO CTR ASTRODYNAM RES,BOULDER,CO 80303. PLANNING SYST INC,BAY ST LOUIS,MS 39529. RP JACOBS, GA (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. RI Jacobs, Gregg/C-1456-2008 NR 25 TC 190 Z9 198 U1 1 U2 11 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD AUG 4 PY 1994 VL 370 IS 6488 BP 360 EP 363 DI 10.1038/370360a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PA304 UT WOS:A1994PA30400052 ER PT J AU SHARP, TW YIP, R MALONE, JD AF SHARP, TW YIP, R MALONE, JD TI US MILITARY FORCES AND EMERGENCY INTERNATIONAL HUMANITARIAN ASSISTANCE - OBSERVATIONS AND RECOMMENDATIONS FROM 3 RECENT MISSIONS SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Article ID STATES HOSPITAL SHIPS; PUBLIC-HEALTH; MORTALITY; POPULATIONS; SOMALIA; REFUGEE; RELIEF; WAR C1 USN,MED RES INST,BETHESDA,MD. USN,NATL MED CTR,BETHESDA,MD. CTR DIS CONTROL & PREVENT,ATLANTA,GA. NR 41 TC 33 Z9 33 U1 0 U2 8 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD AUG 3 PY 1994 VL 272 IS 5 BP 386 EP 390 DI 10.1001/jama.272.5.386 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA NY903 UT WOS:A1994NY90300032 PM 8028171 ER PT J AU NEWTON, JA SCHNEPF, GA WALLACE, MR LOBEL, HO KENNEDY, CA OLDFIELD, EC AF NEWTON, JA SCHNEPF, GA WALLACE, MR LOBEL, HO KENNEDY, CA OLDFIELD, EC TI MALARIA IN US MARINES RETURNING FROM SOMALIA SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Note ID PLASMODIUM-FALCIPARUM; PREVENTION; TRAVELERS; AFRICA AB Objective.-To identify malaria in US Marines returning from Somalia and to determine their compliance with chemoprophylaxis. Design.-Case series. Setting.-The US Navy health care system. Patients.-Consecutive sample of 106 US Marines diagnosed with malaria after returning from Somalia in 1993. Main Outcome Measures.-Identification of the incidence and clinical features of imported malaria. Determination of compliance with chemoprophylaxis in this cohort. Results.-As of December 20, 1993, there were 112 cases of imported malaria in 106 US Marine Corps personnel returning from Somalia. Plasmodium vivax accounted for 97 (87%) of 112 malaria cases, and Plasmodium falciparum accounted for eight (7%) of 112 cases. Mixed infection with P vivax and P falciparum was noted in six (5%) of 112 cases, and a single case of Plasmodium malariae was identified. Patients with P falciparum malaria were diagnosed a mean of 20.9 days (range, 1 to 82 days) after returning to the United States compared with 91.8 days (range, 7 to 228 days) for P vivax infection (P<.0001). The self-reported chemoprophylaxis compliance rate was 56%; however, only 45 (50%) of 90 patients were given an optimal chemoprophylaxis regimen. Conclusions.-Noncompliance with personal protective measures and chemoprophylaxis contributed to the largest outbreak of imported malaria in US military personnel since the Vietnam conflict. Since military personnel frequently go on leave after deployment, health care providers throughout the United States must be aware of the presence of imported malaria from Somalia. C1 USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA. USN HOSP,DEPT INTERNAL MED,CAMP PENDLETON,CA. CTR DIS CONTROL & PREVENT,NATL CTR INFECT DIS,DIV PARASIT DIS,ATLANTA,GA. NR 12 TC 52 Z9 52 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD AUG 3 PY 1994 VL 272 IS 5 BP 397 EP 399 DI 10.1001/jama.272.5.397 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA NY903 UT WOS:A1994NY90300034 PM 8028173 ER PT J AU GLADYSHEV, VN KHANGULOV, SV AXLEY, MJ STADTMAN, TC AF GLADYSHEV, VN KHANGULOV, SV AXLEY, MJ STADTMAN, TC TI COORDINATION OF SELENIUM TO MOLYBDENUM IN FORMATE DEHYDROGENASE-H FROM ESCHERICHIA-COLI SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE SELENOCYSTEINE; SELENOENZYME; MO(V) ELECTRON PARAMAGNETIC RESONANCE SIGNAL; MOLYBDOPTERIN ID SELENOCYSTEINE-CONTAINING POLYPEPTIDE; NUCLEOTIDE-SEQUENCE; ENCODES SELENOCYSTEINE; NITRATE REDUCTASE; XANTHINE-OXIDASE; HYDROGEN-LYASE; GENE-PRODUCT; COFACTORS; CLONING; BIOCHEMISTRY AB Formate dehydrogenase H from Escherichia coli contains multiple redox centers, which include a molybdopterin cofactor, an iron-sulfur center, and a selenocysteine residue (SeCys-140 in the polypeptide chain) that is essential for catalytic activity. Here we show that addition of formate to the native enzyme induces a signal typical of Mo(V) species. This signal is detected by electron paramagnetic resonance (EPR) spectroscopy. Substitution of Se-77 for natural isotope abundance Se leads to transformation of this signal, indicating a direct coordination of Se with Mo. Mutant enzyme with cysteine substituted at position 140 for the selenocysteine residue has decreased catalytic activity and exhibits a different EPR signal. Since determination of the Se content of wild-type enzyme indicates approximate to 1 gram atom per mel, we conclude that it is the Se atom of the SeCys-140 residue in the protein that is coordinated directly with Mo. The amino acid sequence flanking the selenocysteine residue in formate dehydrogenase H is similar to a conserved sequence found in several other prokaryotic molybdopterin-dependent enzymes. In most of these other enzymes a cysteine residue, or in a few cases a serine or a selenocysteine residue, occurs in the position corresponding to SeCys-140 of formate dehydrogenase H. By analogy with formate dehydrogenase H in these other enzymes, at least one of the ligands to Mo should be provided by an amino acid residue of the protein. This ligand could be the Se of a selenocysteine residue, sulfur of a cysteine residue, or, in the case of a serine residue, oxygen. C1 NHLBI,BIOCHEM LAB,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20889. NR 32 TC 67 Z9 68 U1 0 U2 10 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD AUG 2 PY 1994 VL 91 IS 16 BP 7708 EP 7711 DI 10.1073/pnas.91.16.7708 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PA376 UT WOS:A1994PA37600068 PM 8052647 ER PT J AU MARSHALL, DB MORRIS, WL COX, BN GRAVES, J PORTER Jr KOURIS, D EVERETT, RK AF MARSHALL, DB MORRIS, WL COX, BN GRAVES, J PORTER, JR KOURIS, D EVERETT, RK TI TRANSVERSE STRENGTHS AND FAILURE MECHANISMS IN TI3AL MATRIX COMPOSITES SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID CONTINUOUS FIBER COMPOSITE; RESIDUAL-STRESSES AB Transverse mechanical properties have been measured, and damage mechanisms identified, in three Ti3Al matrix composites with different interface compositions and residual stress states. Two of the composites contained SiC fibers with weak interfaces. Large improvements in transverse strength and rupture strain were found in one of these composites, in which brittle reaction products in the matrix around the fibers had been avoided by coating the fibers with Ag and Ta before consolidation. The third composite contained sapphire fibers that were strongly bonded to the matrix. Different damage mechanisms were observed in the strongly and weakly bonded composites. Insight into the damage mechanisms and their dependence on residual stress fields and interface properties is gained from comparison of the observations with analytical solutions of elastic stresses. The conditions for optimum transverse properties are discussed; the results indicate that strong interfacial bonding does not necessarily lead to optimum transverse strength of the composite. C1 ARIZONA STATE UNIV, DEPT MECH & AEROSP ENGN, TEMPE, AZ 85287 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP MARSHALL, DB (reprint author), ROCKWELL INT CORP, 1049 CAMINO DOS RIOS, THOUSAND OAKS, CA 91360 USA. RI Kouris, Demitris/C-2184-2011; OI Everett, Richard/0000-0002-6725-9442 NR 22 TC 37 Z9 37 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD AUG PY 1994 VL 42 IS 8 BP 2657 EP 2673 DI 10.1016/0956-7151(94)90207-0 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NY103 UT WOS:A1994NY10300010 ER PT J AU PANDE, CS DANTSKER, E AF PANDE, CS DANTSKER, E TI ON A STOCHASTIC-THEORY OF GRAIN-GROWTH .4. SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID COMPUTER-SIMULATION; STATISTICAL-THEORY; 3 DIMENSIONS; KINETICS AB The stochastic theory of grain growth proposed previously [C. S. Pande, Acta metall. 35, 2671 (1987)] is developed further, in this paper. It is shown that in addition to lognormality and power law kinetics, dynamic scaling (self similarity) can also be derived from the model. Effects of an arbitrary initial grain size distribution and specimen size are also examined. Finally the question of volume conservation is re-examined in the light of recent criticisms. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RP PANDE, CS (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 23 TC 20 Z9 20 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD AUG PY 1994 VL 42 IS 8 BP 2899 EP 2903 DI 10.1016/0956-7151(94)90231-3 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NY103 UT WOS:A1994NY10300034 ER PT J AU ROY, GD AF ROY, GD TI FOCUS REPORT - TERRESTRIAL ENERGY - STRAINING FOR LONG-RANGE SOLUTIONS SO AEROSPACE AMERICA LA English DT Article RP ROY, GD (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD AUG PY 1994 VL 32 IS 8 BP 33 EP 35 PG 3 WC Engineering, Aerospace SC Engineering GA NZ433 UT WOS:A1994NZ43300011 ER PT J AU LANE, JI KOELLER, KK ATKINSON, JLD AF LANE, JI KOELLER, KK ATKINSON, JLD TI ENHANCED LUMBAR NERVE ROOTS IN THE SPINE WITHOUT PRIOR SURGERY - RADICULITIS OR RADICULAR VEINS SO AMERICAN JOURNAL OF NEURORADIOLOGY LA English DT Article DE NERVES, LUMBAR; NERVES, SPINAL; SPINE, MAGNETIC RESONANCE; RADICULITIS ID LUMBOSACRAL SPINE; MR; PERMEABILITY; COMPRESSION AB PURPOSE: To evaluate the clinical significance of continuous intradural lumbosacral nerve root enhancement in symptomatic patients without prior lumbar surgery. METHODS: Fifty-three patients without prior back surgery, referred to our institution for evaluation of low-back pain and radiculopathy, were studied with gadolinium-enhanced MR (0.1 mmol/kg) of the lumbar spine. Scans were reviewed for the presence of lumbosacral nerve root enhancement and any associated nerve root compression. Results were correlated with clinical history and physical examinations. RESULTS: Seventeen continuously enhancing nerve roots and two enhancing fila terminale were observed in 13 patients. Eight of 17 (47%) had no referable symptoms. Nine of these nerve roots (53%) were not associated with any degree of nerve root compression. Seven cases (41%) were noted to have flow-related enhancement on the entry section of the T1-weighted axial sequence. CONCLUSIONS: Lumbosacral nerve root enhancement correlates poorly with clinical radiculopathy. The use of contrast enhancement to detect lumbosacral nerve root enhancement in cases in which the unenhanced scan is less than diagnostic is not warranted. The high association between lumbosacral nerve root enhancement and entry-section flow-related enhancement suggests that these enhancing structures within the cauda equina are vessels. It is likely that lumbosacral nerve root enhancement represents intravascular enhancement of radicular veins and not a breakdown in the blood-nerve barrier. C1 USN HOSP,DEPT NEUROSURG,OAKLAND,CA. RP LANE, JI (reprint author), USN HOSP,DEPT RADIOL,NEURORADIOL SECT,8750 MT BLVD,OAKLAND,CA 94627, USA. NR 21 TC 30 Z9 30 U1 0 U2 1 PU AMER SOC NEURORADIOLOGY PI OAK BROOK PA 2210 MIDWEST RD, OAK BROOK, IL 60521 SN 0195-6108 J9 AM J NEURORADIOL JI Am. J. Neuroradiol. PD AUG PY 1994 VL 15 IS 7 BP 1317 EP 1325 PG 9 WC Clinical Neurology; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA PB622 UT WOS:A1994PB62200020 PM 7976944 ER PT J AU STRICKMAN, D TANSKUL, P EAMSILA, C KELLY, DJ AF STRICKMAN, D TANSKUL, P EAMSILA, C KELLY, DJ TI PREVALENCE OF ANTIBODIES TO RICKETTSIAE IN THE HUMAN-POPULATION OF SUBURBAN BANGKOK SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID SCRUB TYPHUS; FEBRILE ILLNESS; TSUTSUGAMUSHI; MALAYSIA AB Following a report of three cases of scrub typhus in suburban Bangkok, we performed a serosurvey in the patients' communities. Both IgG and IgM antibodies were measured in an indirect immunoperoxidase assay, using separate spots of antigen from Rickettsia tsutsugamushi (scrub typhus), R. typhi (murine typhus), and TT-118 spotted fever group rickettsiae. Of 215 people donating blood, antibody levels indicative of most recent exposure to R. tsutsugamushi were most prevalent (21%), followed by R. typhi (8%), and TT-118 (4%). Seroprevalence suggesting most recent exposure to R. tsutsuga-mushi varied by location (range 13-31%), gender (26% of females and 13% of males), age (61-80-year-old individuals were the highest, with a prevalence of 38%), and contact with orchards and orchid farms (29% of those with extensive contact, 38% of those with occasional contact, and 10% of those with no contact). These patterns indicated that exposure to R. tsutsugamushi was related to occupation and behavior, as has been observed in areas of rural transmission. Expansion of metropolitan Bangkok has created a situation in which people employed in agriculture live with people employed in the city. As a result, a serosurvey in suburban Bangkok reveals evidence of murine typhus, which is usually transmitted in urban areas, as well as scrub and tick typhus, which are usually transmitted in rural areas. C1 ARMED FORCES RES INST MED SCI, USA MED COMPONENT, DEPT MED ENTOMOL, BANGKOK 10400, THAILAND. ARMED FORCES RES INST MED SCI, ROYAL THAI ARMY COMPONENT, DIV RES, DEPT EPIDEMIOL, BANGKOK 10400, THAILAND. USN, MED RES INST, VIRAL & RICKETTSIAL DIS PROGRAM, BETHESDA, MD USA. NR 26 TC 31 Z9 32 U1 0 U2 3 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DR, STE 130, MCLEAN, VA 22101 USA SN 0002-9637 EI 1476-1645 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD AUG PY 1994 VL 51 IS 2 BP 149 EP 153 PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA PF850 UT WOS:A1994PF85000003 PM 8074248 ER PT J AU OFULLA, AO ORAGO, AS GITHURE, JI BURANS, JP ALEMAN, GM JOHNSON, AJ MARTIN, SK AF OFULLA, AO ORAGO, AS GITHURE, JI BURANS, JP ALEMAN, GM JOHNSON, AJ MARTIN, SK TI DETERMINATION OF 50 PERCENT INHIBITORY CONCENTRATIONS (IC50) OF ANTIMALARIAL-DRUGS AGAINST PLASMODIUM-FALCIPARUM PARASITES IN A SERUM-FREE MEDIUM SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID INVITRO; SENSITIVITY; CHLOROQUINE AB Plasmodium falciparum chemosensitivity to the various antimalarial drugs is presently determined in the laboratory by setting up multiple microcultures of the parasite and estimating the amount of growth inhibition caused by known concentrations of drug. Parasite growth inhibition is assessed either by microscopy, radiolabeled substrate uptake, or calorimetrically. The obligate requirement for serum in this assay presents difficulties in the direct comparison of results among laboratories. We now have evidence that antimalarial drug sensitivity assays can be reliably performed in a serum-free medium. The overall comparison of 50% inhibitory concentration (IC50) values obtained with serum-free media (bovine albumin, Cohn fraction V [BAM] and BAM combined with glucose and lipids-cholesterol-rich mixture) and those obtained in serum-supplemented medium was r = 0.56; n = 60; P < 0.01. C1 KENYA GOVT MED RES CTR,CLIN RES CTR,NAIROBI,KENYA. KENYATTA UNIV,DEPT ZOOL,NAIROBI,KENYA. USN,MED RES INST,DIV INFECT DIS,BETHESDA,MD 20889. WALTER REED ARMY MED CTR,WALTER REED ARMY INST RES,USAMRU KENYA,WASHINGTON,DC 20307. RP OFULLA, AO (reprint author), KENYA GOVT MED RES CTR,BIOMED SCI RES CTR,NAIROBI,KENYA. NR 6 TC 6 Z9 6 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD AUG PY 1994 VL 51 IS 2 BP 214 EP 218 PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA PF850 UT WOS:A1994PF85000013 PM 8074255 ER PT J AU BASSILY, S HYAMS, KC ELMASRY, NA FARID, Z CROSS, E BOURGEOIS, AL AYAD, E HIBBS, RG AF BASSILY, S HYAMS, KC ELMASRY, NA FARID, Z CROSS, E BOURGEOIS, AL AYAD, E HIBBS, RG TI SHORT-COURSE NORFLOXACIN AND TRIMETHOPRIM-SULFAMETHOXAZOLE TREATMENT OF SHIGELLOSIS AND SALMONELLOSIS IN EGYPT SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID TRAVELERS DIARRHEA; CIPROFLOXACIN; DISEASE AB In a double-blind clinical study, 109 adult Egyptian patients infected with Shigella spp. and 45 infected with Salmonella spp. were randomly assigned to three treatment groups: 1) norfloxacin in a single 800-mg dose, 2) norfloxacin, 400 mg twice a day for three days, and 3) trimethoprim (160 mg)-sulfamethoxazole (800 mg) (TMP-SMX), twice a day for three days. Among Shigella-infected patients, diarrheal symptoms had resolved in 86-97% and bacteriologic failure (repeat positive stool culture) occurred in only two patients five days after the start of the three treatment regimens. Among Salmonella-infected patients, diarrheal symptoms had resolved in 76-82% of patients and bacteriologic failure was common (18-36%) five days after the start of therapy. These data indicate that short-course therapy with either norfloxacin or TMP-SMX can be effectively used to treat shigellosis in adults in developing countries. However, for uncomplicated Salmonella spp. infection, short-course therapy with norfloxacin and TMP-SMX may not lead to a rapid resolution of symptoms or consistently eliminate this enteropathogen. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. USN,MED RES INST,DEPT INFECT DIS,BETHESDA,MD. USN,MED RES INST,DIV ENTER,BETHESDA,MD. EGYPTIAN MINIST HLTH,ABBASSIA FEVER HOSP,CAIRO,EGYPT. NR 13 TC 14 Z9 14 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD AUG PY 1994 VL 51 IS 2 BP 219 EP 223 PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA PF850 UT WOS:A1994PF85000014 PM 8074256 ER PT J AU COLLINS, GE ROSEPEHRSSON, SL AF COLLINS, GE ROSEPEHRSSON, SL TI FLUORESCENT DETECTION OF HYDRAZINE, MONOMETHYLHYDRAZINE, AND 1,1-DIMETHYLHYDRAZINE BY DERIVATIZATION WITH AROMATIC DICARBALDEHYDES SO ANALYST LA English DT Article DE FLUORESCENCE; DERIVATIZATION; HYDRAZINE; NAPHTHALENE-2,3-DICARBALDEHYDE AB A chemical derivatization scheme has been developed for the sensitive and selective determination of hydrazine, monomethylhydrazine (MMH) and 1,1-dimethylhydrazine (UDMH) by fluorescence spectrometry. Incorporation of hydrazine into an aromatic framework by derivatization with o-phthalaldehyde (OPA), naphthalene-2,3-dicarbaldehyde (NDA), or anthracene-2,3-dicarbaldehyde (ADA) creates an efficient fluorophore the emission wavelength of which is red-shifted from the original reagent. The fluorescence emission for each of the different derivatizing reagents (OPA, NDA, and ADA), is minimal and nearly within the noise of the background. The hydrazine derivatives, on the other hand, are intensely fluorescent and characterized by a broad fluorescence emission centred at 376 nm for OPA, 500 nm for NDA, and 549 mm for ADA. For the NDA hydrazine derivative, a linear concentration dependence is observed from 50 ng l(-1) to 500 mu g l(-1) of hydrazine (correlation coefficient, r > 0.999). The response time necessary to give 90% of a full-scale response is <2 min. The response of the ADA reagent is similar; however, its response time is faster (<0.5 min), and its detection limit is higher (150 ng l(-1)). By careful control of the pH and the aromatic dicarbaldehyde chosen, it is possible to differentiate quantitatively between the hydrazine, MMH, and UDMH levels present in mixed samples. The detection limits for MMH and UDMH using the NDA reagent are 120 ng l(-1) and 40 mu g l(-1), respectively. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 24 TC 52 Z9 56 U1 2 U2 11 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0003-2654 J9 ANALYST JI Analyst PD AUG PY 1994 VL 119 IS 8 BP 1907 EP 1913 DI 10.1039/an9941901907 PG 7 WC Chemistry, Analytical SC Chemistry GA PE574 UT WOS:A1994PE57400047 ER PT J AU BUCKLEY, RG AKS, SE ESHOM, JL RYDMAN, R SCHAIDER, J SHAYNE, P AF BUCKLEY, RG AKS, SE ESHOM, JL RYDMAN, R SCHAIDER, J SHAYNE, P TI THE PULSE OXIMETRY GAP IN CARBON-MONOXIDE INTOXICATION SO ANNALS OF EMERGENCY MEDICINE LA English DT Note AB Study objective: Pulse oximetry has been reported to be falsely elevated in the presence of carbon monoxide (CO). However, the degree to which pulse oximetry overestimates measured oxyhemoglobin saturation (O2Hb) has not been investigated in patients with CO exposure. This study quantifies the effect of CO on pulse oximetry and O2Hb in a series of patients with elevated carboxyhemoglobin (COHb) levels. Methods: A prospective case series of 25 pulse oximetry measurements, with concurrent arterial blood gas sampling, were obtained on 16 adults with CO exposure. Results: COHb levels (mean, 16.1%; SD, 11.6%; range, 2.2% to 44%) did not significantly correlate with pulse oximetry saturation (mean, 97.7%; SD, 1.5%; range 96% to 100%) (r=.45; P=.1 [NS]). Compared with COHb, a pulse oximetry gap (mean, 17.5%; SD, 1.5%; range, 2.3% to 42%), defined as pulse oximetry saturation minus O2Hb, yielded a linear regression model: pulse oximetry gap=1.82+0.94xCOHb (SEM=0.07; F=204; R2=.90; p<.0001). Conclusion: Oxygen saturation as measured by pulse oximetry failed to decrease to less than 96% despite COHb levels as high as 44%. Regression between the pulse oximetry gap and COHb suggests that pulse oximetry overestimates O2Hb by the amount of COHb present. Pulse oximetry is unreliable in estimating O2Hb saturation in CO-exposed patients and should be interpreted with caution when used to estimate oxygen saturation in smokers. RP BUCKLEY, RG (reprint author), USN,MED CTR SAN DIEGO,DEPT EMERGENCY MED,SAN DIEGO,CA 92134, USA. NR 0 TC 41 Z9 41 U1 0 U2 2 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0196-0644 J9 ANN EMERG MED JI Ann. Emerg. Med. PD AUG PY 1994 VL 24 IS 2 BP 252 EP 255 DI 10.1016/S0196-0644(94)70137-7 PG 4 WC Emergency Medicine SC Emergency Medicine GA PA156 UT WOS:A1994PA15600011 PM 8037391 ER PT J AU PELINI, M BOICE, D ONEIL, K LAROCQUE, J AF PELINI, M BOICE, D ONEIL, K LAROCQUE, J TI GLUCOCEREBROSIDASE TREATMENT OF TYPE-I GAUCHER DISEASE WITH SEVERE PULMONARY INVOLVEMENT SO ANNALS OF INTERNAL MEDICINE LA English DT Note C1 USN,MED CTR,DIV PULM,PORTSMOUTH,VA 23708. NR 9 TC 19 Z9 19 U1 0 U2 0 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD AUG 1 PY 1994 VL 121 IS 3 BP 196 EP 197 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA NY338 UT WOS:A1994NY33800006 PM 8017746 ER PT J AU ANIS, EI GIRGIS, NI TRIBBLE, DR FARID, Z AF ANIS, EI GIRGIS, NI TRIBBLE, DR FARID, Z TI DERMATOMYOSITIS PRESENTING WITH PROLONGED FEVER AND NEUROLOGICAL SYMPTOMS SO ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY LA English DT Note ID POLYMYOSITIS DERMATOMYOSITIS; DISEASE RP ANIS, EI (reprint author), USN,MED RES UNIT 3,RES PUBLICAT BRANCH,PSC 452,BOX 5000,CODE 304A,FPO,AE 09835, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU CARFAX PUBL CO PI ABINGDON PA PO BOX 25, ABINGDON, OXFORDSHIRE, ENGLAND OX14 3UE SN 0003-4983 J9 ANN TROP MED PARASIT JI Ann. Trop. Med. Parasitol. PD AUG PY 1994 VL 88 IS 4 BP 455 EP 457 PG 3 WC Public, Environmental & Occupational Health; Parasitology; Tropical Medicine SC Public, Environmental & Occupational Health; Parasitology; Tropical Medicine GA PG207 UT WOS:A1994PG20700016 PM 7979635 ER PT J AU SICA, L AYE, T TENGARA, I WEXLER, B AF SICA, L AYE, T TENGARA, I WEXLER, B TI COMPENSATION OF SPACER-THICKNESS VARIATIONS IN A HOLOGRAPHIC FABRY-PEROT FILTER SO APPLIED OPTICS LA English DT Article DE FABRY-PEROT INTERFEROMETER; VOLUME HOLOGRAM; BRAGG MIRROR; INTERFEROMETER COMPENSATION; ABERRATION COMPENSATION ID COUPLED-WAVE ANALYSIS; REFLECTION GRATINGS AB The fabrication of a solid, holographically recorded Fabry-Perot interferometer that uses plate glass for the spacer has recently been reported. The component produced sharp, circular Fabry-Perot fringes in spite of its use of a plate-glass spacer. We develop a general theoretical characterization of such a component that accounts for its low sensitivity to spacer-thickness variations. We use the Kogelnik theory of volume holograms to calculate the phase change on reflection from the mirrors. This phase change results from the position of the fringes formed throughout the two holographic media during the recording process. An expression for the wavelength location of the transmission peak versus spacer-thickness variation is derived that agrees with the current experimental information available. C1 PHYS OPT CORP, TORRANCE, CA 90505 USA. RP SICA, L (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD AUG 1 PY 1994 VL 33 IS 22 BP 5021 EP 5028 PG 8 WC Optics SC Optics GA PD324 UT WOS:A1994PD32400010 PM 20935882 ER PT J AU GOLDBERG, L MEHUYS, D AF GOLDBERG, L MEHUYS, D TI BLUE-LIGHT GENERATION USING A HIGH-POWER TAPERED AMPLIFIER MODE-LOCKED LASER SO APPLIED PHYSICS LETTERS LA English DT Article ID PULSE GENERATION; DIODE AB Light at 430 nm is generated by frequency doubling the high peak power output of a mode-locked compound cavity laser based on a tapered GaAlAs amplifier. The laser generated a peak 860 nm power of 12.7 W and pulse energy of 450 pJ. Using a 7.1 mm KNbO3 CrYStal, 45 mW of average blue light power was produced with a peak power of 1.6 W, minimum pulse length of 8.5 ps, and pulse energy of 30 pJ. C1 SDL INC,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 18 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 1 PY 1994 VL 65 IS 5 BP 522 EP 524 DI 10.1063/1.112285 PG 3 WC Physics, Applied SC Physics GA PA153 UT WOS:A1994PA15300003 ER PT J AU BENNETT, BR SHANABROOK, BV GLASER, ER AF BENNETT, BR SHANABROOK, BV GLASER, ER TI INTERFACE CONTROL IN INAS/ALSB SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; QUANTUM-WELLS; LAYER SUPERLATTICES; RAMAN-SCATTERING; GROWTH; QUALITY AB The presence of two species of both cations and anions permits the construction of InAs/AlSb heterostructures with either AlAs- or InSb-like interfaces. Using migration-enhanced epitaxial techniques, we grew InAs/AlSb superlattices with both types of interfaces. The control of interfacial composition was confirmed by x-ray diffraction and Raman spectroscopy measurements. We demonstrate that superlattices displaying multiple x-ray diffraction satellites, distinct planar vibrational modes, and strong photoluminescence can be achieved with both InSb- and AlAs-bonded interfaces using appropriate buffer layers and growth temperatures. RP BENNETT, BR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 16 TC 28 Z9 28 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 1 PY 1994 VL 65 IS 5 BP 598 EP 600 DI 10.1063/1.112955 PG 3 WC Physics, Applied SC Physics GA PA153 UT WOS:A1994PA15300029 ER PT J AU SPAK, EW RECTOR, JT CAMARCA, MA SANTIAGO, LM AF SPAK, EW RECTOR, JT CAMARCA, MA SANTIAGO, LM TI RADIOLOGICAL CASES OF THE MONTH - NEONATAL INTRATHORACIC TERATOMA PRESENTING AS A POSTEROLATERAL CHEST-WALL MASS SO ARCHIVES OF PEDIATRICS & ADOLESCENT MEDICINE LA English DT Note C1 USN,MED CTR,DIV LAB & PATHOL,SAN DIEGO,CA 92152. USN,MED CTR,DEPT RADIOL,SAN DIEGO,CA 92152. USN,MED CTR,DEPT PEDIAT,SAN DIEGO,CA 92152. USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92152. NR 11 TC 1 Z9 1 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 1072-4710 J9 ARCH PEDIAT ADOL MED JI Arch. Pediatr. Adolesc. Med. PD AUG PY 1994 VL 148 IS 8 BP 831 EP 832 PG 2 WC Pediatrics SC Pediatrics GA PB264 UT WOS:A1994PB26400009 PM 8044258 ER PT J AU REYNOLDS, JE JAUNCEY, DL RUSSELL, JL KING, EA MCCULLOCH, PM FEY, AL JOHNSTON, KJ AF REYNOLDS, JE JAUNCEY, DL RUSSELL, JL KING, EA MCCULLOCH, PM FEY, AL JOHNSTON, KJ TI A RADIO OPTICAL REFERENCE FRAME .7. ADDITIONAL SOURCE POSITIONS FROM A SOUTHERN-HEMISPHERE SHORT BASE-LINE SURVEY SO ASTRONOMICAL JOURNAL LA English DT Article ID NORTHERN-HEMISPHERE; ACCURATE RADIO; VLBI AB We report accurate radio positions for 107 VLBI sources using Very Long Baseline Inteferometry (VLBI), as part of a continuing program to establish a global reference frame of about 400 extragalactic radio positions. The observations were made with Australian radio telescopes at Tidbinbilla and Hobart during 1990 using Mark III VLBI recording systems. The positions reported here add 50 new sources to the global reference frame catalog, bringing the total number to 403, of which 208 are in the Northern hemisphere and 195 in the Southern. The new positions have median errors of about 5 milliarseconds, limited by the relatively short baseline of 832 km. C1 APPL RES CORP,LANDOVER,MD 20785. UNIV TASMANIA,HOBART,TAS 7001,AUSTRALIA. USN,RES LAB,WASHINGTON,DC 20375. USN OBSERV,WASHINGTON,DC 20392. RP REYNOLDS, JE (reprint author), CSIRO,AUSTRALIA TELESCOPE NATL FACIL,EPPING,NSW 2121,AUSTRALIA. RI King, Edward/A-1473-2012 OI King, Edward/0000-0002-6898-2130 NR 15 TC 15 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 1994 VL 108 IS 2 BP 725 EP 730 DI 10.1086/117109 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NZ059 UT WOS:A1994NZ05900036 ER PT J AU FIEDLER, R DENNISON, B JOHNSTON, KJ WALTMAN, EB SIMON, RS AF FIEDLER, R DENNISON, B JOHNSTON, KJ WALTMAN, EB SIMON, RS TI A SUMMARY OF EXTREME SCATTERING EVENTS AND A DESCRIPTIVE MODEL SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, STRUCTURE; RADIO CONTINUUM, GALAXIES; TURBULENCE ID EXTRAGALACTIC RADIO-SOURCES; INTERSTELLAR-MEDIUM; DENSITY-FLUCTUATIONS; VLBI OBSERVATIONS; COMPLETE SAMPLE; 5 GHZ; SCINTILLATION; SCALE; TURBULENCE; SPECTRUM AB An ongoing monitoring program of compact extragalactic radio sources over the past 11 years has revealed many instances of unusual variations that cannot be explained using the standard models for intrinsic variability or normal refractive interstellar scintillation. The observations included simultaneous daily measurements at 2.695 and 8.085 GHz of 40 to 150 sources using, the Green Bank interferometer over the period 1979-1989. Approximately 330 sources were also monitored with the NRAO 300 foot radio telescope at 3.25 and 4.675 GHz over the 6 month period 1987 December to 1988 May. In total, 594 source-years of observations have been obtained, of which 4.8 yr constitutes the total time span of unusual variability. The unusual variations, denoted as extreme scattering events (ESEs), are summarized here. The most striking property of ESEs is their frequency dependence, in which departures from the quiescent flux density (by as much as 50% at 2.7 GHz) have no counterpart at 8.1 GHz. The single exception occurred in the 8.1 GHz light curve of 0954 + 658, which showed spiky variations during. the 2.7 GHz event. To date, 10 ESEs have been tentatively identified in the 2.7 GHz light curves of nine quasars. These ESEs appear to occur preferentially near loops in the Galactic foreground brightness distribution. A simple model based on diffraction or refraction through Galactic regions of unusually high electron density turbulence is presented. C1 VIRGINIA POLYTECH INST & STATE UNIV,CTR STOCHAST PROC SCI & ENGN,BLACKSBURG,VA 24061. VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. RP FIEDLER, R (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7200,WASHINGTON,DC 20375, USA. NR 41 TC 82 Z9 82 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1994 VL 430 IS 2 BP 581 EP 594 DI 10.1086/174432 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NZ043 UT WOS:A1994NZ04300013 ER PT J AU FIEDLER, R PAULS, T JOHNSTON, KJ DENNISON, B AF FIEDLER, R PAULS, T JOHNSTON, KJ DENNISON, B TI GALACTIC STRUCTURES ASSOCIATED WITH EXTREME SCATTERING EVENTS IN THE RADIO LIGHT CURVES OF NRAO 140, 0954+658, AND 2352+495 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, STRUCTURE; QUASARS, GENERAL; RADIO CONTINUUM, GALAXIES; TURBULENCE ID VLBI OBSERVATIONS; DARK CLOUDS; SKY SURVEY AB Of the nine quasars whose radio light curves contain suspected extreme scattering events (ESEs), we find that the lines of sight toward three of them (NRAO 140, 0954+658, and 2352+495) pass through the edges of clearly identifiable Galactic structures seen at IR wavelengths and in 21 cm continuum emission. These structures are possible sites for enhanced turbulence in the electron column density distribution which, through diffractive or refractive propagation effects, may be responsible for the unusual flux density variations we denote as an ESE. Of the remaining six sources whose light curves display an ESE, four (0133+476, 0300+470, 1749+096, ana 1821+107) appear near the edges of 100 mum IR clumps in the Galactic foreground and two (1502+106 and 1611+343) are 1-degrees-2-degrees from the nearest clump. We suggest that the shell-like object, observed in projection against NRAO 140, may be a very old nova remnant. C1 VIRGINIA POLYTECH INST & STATE UNIV,CTR STOACHAST PROC SCI & ENGN,BLACKSBURG,VA 24061. VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. RP FIEDLER, R (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7200,WASHINGTON,DC 20375, USA. NR 28 TC 20 Z9 20 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1994 VL 430 IS 2 BP 595 EP 600 DI 10.1086/174433 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NZ043 UT WOS:A1994NZ04300014 ER PT J AU MOSES, D COOK, JW BARTOE, JDF BRUECKNER, GE DERE, KP WEBB, DF DAVIS, JM HARVEY, JW RECELY, F MARTIN, SF ZIRIN, H AF MOSES, D COOK, JW BARTOE, JDF BRUECKNER, GE DERE, KP WEBB, DF DAVIS, JM HARVEY, JW RECELY, F MARTIN, SF ZIRIN, H TI SOLAR FINE-SCALE STRUCTURES IN THE CORONA, TRANSITION REGION, AND LOWER ATMOSPHERE SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, CORONA; SUN, MAGNETIC FIELDS; SUN, TRANSITION REGION; SUN, X-RAYS, GAMMA-RAYS ID RAY BRIGHT POINTS; TEMPERATURE-MINIMUM REGION; X-RAY; QUIET SUN; EXPLOSIVE EVENTS; MAGNETIC NETWORK; CHROMOSPHERE; IDENTIFICATION; TELESCOPE; MODELS AB The American Science and Engineering Soft X-ray Imaging Payload and the Naval Research Laboratory High Resolution Telescope and Spectrograph (HRTS) were launched from White Sands on 1987 December 11 in coordinated sounding rocket flights. The goal was to investigate the correspondence of fine-scale structures from different temperature regimes in the solar atmosphere, and particularly the relationship between X-ray bright points (XBPs) and transition region explosive events. We present results of the analysis of co-aligned X-ray images, maps of sites of transition region explosive events observed in C IV (10(5) K), HRTS 1600 angstrom spectroheliograms of the T(min) region, and ground-based magnetogram and He I 10830 angstrom images. We examined the relationship of He I 10830 angstrom dark features and evolving magnetic features which correspond to XBPs. We note a frequent double ribbon pattern of the He i dark feature counterparts to XBPs. We discuss an analysis of the relationship of XBPs to evolving magnetic features by Webb et al., which shows that converging magnetic features of opposite polarity are the most significant magnetic field counterparts to XBPs. The magnetic bipolar features associated with XBPs appear as prominent network elements in chromospheric and transition region images. The features in C IV observations corresponding to XBP sites are in general bright, larger scale (approximately 10 arcsec) regions of complex velocity fields of order 40 km s-1, which is typical of brighter C IV network elements. These C IV features do not reach the approximately 100 km s-1 velocities seen in the C IV explosive events. Also, there are many similar C IV bright network features without a corresponding XBP in the X-ray image. The transition region explosive events do not correspond directly to XBPs. The explosive events appear to be concentrated in the quiet Sun at the edges of strong network, or within weaker field strength network regions. We find a greater number of C IV events than expected from the results of a previous Spacelab 2 HRTS disk survey. We attribute this at least partly to better spatial resolution with the newer HRTS data. The full-disk X-ray image shows a pattern of dark lanes in quiet Sun areas. The number density of C IV events is twice as large inside as outside a dark lane (4.6 x 10(-3) vs. 2.3 x 10(-3) explosive events per arcsec2). The dark lane corresponds to an old decaying magnetic neutral line. We suggest that this provides an increased opportunity for small-scale convergence and reconnection of opposite polarity magnetic field features, in analogy with the results of Webb et al. for XBPs but at a reduced scale of reconnection. C1 NASA, WASHINGTON, DC 20546 USA. NASA, GEORGE C MARSHALL SPACE FLIGHT CTR, HUNTSVILLE, AL 35812 USA. BOSTON COLL, INST SPACE RES, NEWTON, MA 02159 USA. NATL OPT ASTRON OBSERV, NATL SOLAR OBSERV, TUCSON, AZ 85726 USA. NOAA, SPACE ENVIRONM LAB, BOULDER, CO 80303 USA. CALTECH, DIV PHYS MATH & ASTRON 26433, PASADENA, CA 91125 USA. CALTECH, BIG BEAR SOLAR OBSERV, PASADENA, CA 91125 USA. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7660, WASHINGTON, DC 20375 USA. NR 54 TC 29 Z9 30 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1994 VL 430 IS 2 BP 913 EP + DI 10.1086/174461 PN 1 PG 1 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NZ043 UT WOS:A1994NZ04300042 ER PT J AU BANKS, RD GRISSETT, JD TURNIPSEED, GT SAUNDERS, PL RUPERT, AH AF BANKS, RD GRISSETT, JD TURNIPSEED, GT SAUNDERS, PL RUPERT, AH TI THE PUSH-PULL EFFECT SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB The purpose of this study was to prove or refute previous authors' suggestions that tolerance to +Gz is reduced when preceded by 0 Gz or -Gz. Six men and six women were subjected to one session of acceleration stresses that varied between -2 and +2.25 Gz on the NAMRL Coriolis Acceleration Platform (CAP). At the beginning and end of each session, we exposed the relaxed subjects to identical control segments that were comprised of +1 Gz for 30 s, followed by +2.25 Gz for 15 s, and then return to +1 Gz. Subjects were also exposed to three experimental segments that were comprised of 0, -1, or -2 Gz for 10 s, followed by +2.25 Gz for 15 s, and then return to +1 Gz. Subjects verbally reported any decrements in peripheral vision during exposure to +2.25 Gz. Blood pressure (BP) was reduced during each 15-s period at +2.25 Gz. The minimum BP was progressively lower during the 15-s period as the preexposure experimental conditions became more negative (+1, 0, -1, and -2 Gz). Episodes of peripheral vision loss increased as the preceding -Gz became more negative. BP during exposure to +Gz was significantly affected by the preceding 10-s exposure to -Gz, and is indicative of reduced +Gz tolerance. As this ''push-pull effect'' may result in unexpected incapacitation, it has important implications for aviation safety. C1 USN,INST AEROSP & OPERAT MED,PENSACOLA,FL 32512. USN,AEROSP MED RES LAB,PENSACOLA,FL 32512. NR 16 TC 40 Z9 51 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD AUG PY 1994 VL 65 IS 8 BP 699 EP 704 PG 6 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA PA921 UT WOS:A1994PA92100001 PM 7980328 ER PT J AU RUDOLPH, AS CLIFF, RO SPARGO, BJ SPIELBERG, H AF RUDOLPH, AS CLIFF, RO SPARGO, BJ SPIELBERG, H TI TRANSIENT CHANGES IN THE MONONUCLEAR PHAGOCYTE SYSTEM FOLLOWING ADMINISTRATION OF THE BLOOD SUBSTITUTE LIPOSOME-ENCAPSULATED HEMOGLOBIN SO BIOMATERIALS LA English DT Article; Proceedings Paper CT 4th International Conference on Molecular Aspects of Biomaterials (BIOINTERACTIONS 93) CY AUG 29-SEP 01, 1993 CL NOORDWIJKERHOUT, NETHERLANDS DE BLOOD SUBSTITUTE; LIPOSOMES; ENCAPSULATION; CLINICAL CHEMISTRY; HISTOPATHOLOGY; CYTOKINES ID STROMA-FREE HEMOGLOBIN; BIOLOGICAL RESPONSES; RED-CELL; RAT; HEMOLYSIS; INVIVO; INTERFERENCE; KIDNEY; FLUID AB We have examined the effects of administration of the blood substitute, liposome-encapsulated haemoglobin (LEH), in the normovolaemic rat. Test groups included LEH, lyophilized EH, the liposome vehicle, unencapsulated haemoglobin and normal saline, which were injected into the tail vein (n = 6; n = 3 for sham and saline groups). Administration of LEH (2.5 g phospholipid, 1.25 g haemoglobin/kg rat) was followed by blood sampling at 2 h, 24 h, 1 wk and 2 wk. Blood samples were analysed for alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, gamma-glutamyltransferase, total and indirect bilirubin, serum creatinine, albumin, total protein, lipase, cholesterol, blood urea nitrogen, haematocrit, haemoglobin and differential white blood cell counts. Observed effects following injection were mild and transient, with baseline values recovered at 1 wk. Alanine aminotransferase increased moderately in the LEH group at 24 h to 601 +/- 143 IU/dl (P < 0.0001), with a return to baseline at 1 wk. Aspartate aminotransferase showed a smaller increase from 46 +/- 5 to 162 +/- 40 at 24 h and also returned to baseline at the 1 wk measurement (P < 0.001). The transient increase in serum transaminases was not observed for the lyophilized LEH group, Tissue sections showed accumulation of liposome groups in resident macrophages of the liver and spleen. Incubation of an adherent population of human peripheral blood monocytes with LEH in culture did not elicit the production of the inflammatory cytokine, tumour necrosis factor. Pre-incubation of monocytes with LEH prior to exposure to endotoxin did, however, result in a reduced expression of this inflammatory cytokine. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. GEORGETOWN UNIV,DEPT BIOCHEM,WASHINGTON,DC 20007. RP RUDOLPH, AS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 44 TC 17 Z9 17 U1 0 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0142-9612 J9 BIOMATERIALS JI Biomaterials PD AUG PY 1994 VL 15 IS 10 BP 796 EP 804 DI 10.1016/0142-9612(94)90034-5 PG 9 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA PC347 UT WOS:A1994PC34700011 PM 7986944 ER PT J AU SPARGO, BJ RUDOLPH, AS ROLLWAGEN, FM AF SPARGO, BJ RUDOLPH, AS ROLLWAGEN, FM TI RECRUITMENT OF TISSUE RESIDENT CELLS TO HYDROGEL COMPOSITES - IN-VIVO RESPONSE TO IMPLANT MATERIALS SO BIOMATERIALS LA English DT Article; Proceedings Paper CT 4th International Conference on Molecular Aspects of Biomaterials (BIOINTERACTIONS 93) CY AUG 29-SEP 01, 1993 CL NOORDWIJKERHOUT, NETHERLANDS DE HYDROGELS; WOUND MODEL; CYTOKINES; FLOW CYTOMETRY; IMMUNOLOGY; BIOMATERIALS ID BIOMATERIALS; MODEL AB A model of local cellular recruitment was established using hydrogel matrices composed of alginate implanted subcutaneously into mice. Cells which trafficked to the matrix blocks were recovered and characterized for surface phenotype using iluorescently labelled antibodies and flow cytometry (fluorescence activated cell sorting). Temporal information of the differential recruitment of cells was determined. The basic pattern of recruitment in response to the hydrogels was established and mimicked that seen in a local inflammatory response. Neutrophils (PMN) were rapidly recruited (1 d) followed by macrophages and lymphocytes (1-3 d). Cell surface phenotype studies included the determination of CD3(+), CD4(+) and CD8(+) cells, Mac-1(+) cells, and immunoglobulin bearing cells. Microscopic analysis revealed numerous activated PMNs and monocyte derived foamy macrophages. Fluorescence immunocytochemistry of frozen sections of the block revealed that macrophages, CD3(+) and natural killer tells were all recruited to the interior of the block. Ultrastructural analysis (transmission electron microscopy) showed highly activated macrophages, with abundant rough endoplasmic reticulum and secretory vesicles. Cells which remained on the surface of the matrix block were CD44 positive migratory cells. Electron microscopic evidence showed foamy macrophages with a varying degree of involvement with the hydrogel material. Surface scanning electron microscopy revealed numerous fibroblast-like cells coating the surface of the block. We suggest that these methods may be used to address the inflammatory response elicited with a variety of implanted materials such as hydrogels, silicones, ceramics and metals. Furthermore, this model has been useful in determining cellular responses to cytokines and growth factors under similar conditions. C1 USN,MED RES INST,WOUND REPAIR ENHANCEMENT PROGRAM,BETHESDA,MD 20889. RP SPARGO, BJ (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 14 TC 18 Z9 19 U1 1 U2 6 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0142-9612 J9 BIOMATERIALS JI Biomaterials PD AUG PY 1994 VL 15 IS 10 BP 853 EP 858 DI 10.1016/0142-9612(94)90042-6 PG 6 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA PC347 UT WOS:A1994PC34700019 PM 7986951 ER PT J AU DUNN, BK COGLIATI, T CULTRARO, CM BARNER, M SEGAL, S AF DUNN, BK COGLIATI, T CULTRARO, CM BARNER, M SEGAL, S TI REGULATION OF MURINE MAX (MYN) PARALLELS THE REGULATION OF C-MYC IN DIFFERENTIATING MURINE ERYTHROLEUKEMIA-CELLS SO CELL GROWTH & DIFFERENTIATION LA English DT Article ID DNA-BINDING; TRANSCRIPTIONAL ACTIVATION; RAS COTRANSFORMATION; NEOPLASTIC-CELLS; EXPRESSION; PROTEIN; GENE; ONCOGENE; GROWTH; FORMS AB Max is a basic region-helix-loop-helix-leucine zipper protein that consists of two major isoforms, p22 (long form, Max-L) and p21 (short form, Max-S). These proteins are encoded by two [the 1.9- and the predominant 2.3-kilobase (kb) forms] of the five alternatively spliced max mRNA species. We now demonstrate that N,N'-hexamethylene bisacetamide-mediated differentiation of murine erythroleukemia cells leads to a pattern of biphasic down-regulation of the 1.9- and the 2.3-kb myn (murine max) mRNAs that closely parallels that which occurs for myc mRNA. In contrast, the p22/Myn-L and p21/Myn-S protein isoforms down-regulate in monophasic fashion. Unlike the short-lived myc mRNA, the myn message is quite stable. However, its half-life of 3-6 h is still consistent with the biphasic down-regulation that accompanies differentiation. Furthermore, unlike myc, the overexpression of which prevents differentiation, elevated max levels merely delay differentiation. Coincident with this is a delay in the second decline of c-myc mRNA. In N,N'-hexamethylene bisacetamide-induced cells blocked from differentiating by overexpression of c-, N- or L-myc, myn mRNA expression is constitutive. These findings suggest that C1 USN,NCI,MED ONCOL BRANCH,BLDG 8,ROOM 5101,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20889. NCI,PEDIAT BRANCH,BETHESDA,MD 20892. NR 47 TC 16 Z9 16 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 1044-9523 J9 CELL GROWTH DIFFER JI Cell Growth Differ. PD AUG PY 1994 VL 5 IS 8 BP 847 EP 854 PG 8 WC Cell Biology SC Cell Biology GA PB149 UT WOS:A1994PB14900006 PM 7986749 ER PT J AU HEIM, RC KAUFMAN, BA PARK, TS AF HEIM, RC KAUFMAN, BA PARK, TS TI COMPLETE MIGRATION OF PERITONEAL SHUNT TUBING TO THE SCALP SO CHILDS NERVOUS SYSTEM LA English DT Note DE HYDROCEPHALUS; VENTRICULOPERITONEAL SHUNT; TUBE MIGRATION; COMPLICATION AB The entire length of distal tubing from a ventriculoperitoneal shunt was found to have migrated into the subgaleal space, and resulted in a shunt obstruction. Upward migration of distal shunt catheters has rarely been reported, but probably involves patient motion that creates a ''windlass'' effect. Cephaled migration requires a potential space (subgaleal or ventricular) and no resistance to movement of the tubing. This complication can be prevented by securing the shunt near the site of motion. C1 WASHINGTON UNIV,ST LOUIS CHILDRENS HOSP,SCH MED,DEPT NEUROL & NEUROL SURG,ST LOUIS,MO 63110. USN HOSP,DEPT NEUROSURG,BETHESDA,MD. NR 8 TC 8 Z9 8 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0256-7040 J9 CHILD NERV SYST JI Childs Nerv. Syst. PD AUG PY 1994 VL 10 IS 6 BP 399 EP 400 DI 10.1007/BF00335131 PG 2 WC Clinical Neurology; Pediatrics; Surgery SC Neurosciences & Neurology; Pediatrics; Surgery GA PD504 UT WOS:A1994PD50400008 PM 7842429 ER PT J AU PONTIER, PJ PATEL, TG AF PONTIER, PJ PATEL, TG TI RACIAL-DIFFERENCES IN THE PREVALENCE AND PRESENTATION OF GLOMERULAR-DISEASE IN ADULTS SO CLINICAL NEPHROLOGY LA English DT Article DE GLOMERULONEPHRITIS; RENAL BIOPSY; NEPHROTIC SYNDROME ID FOCAL SEGMENTAL GLOMERULOSCLEROSIS; NEPHROTIC SYNDROME; CHILDREN AB In order to ascertain the prevalence of glomerulopathies in our patient population, all renal biopsies performed on patients older than 14 years of age presenting to a single military hospital from 1983 to 1992 were reviewed. Two hundred and eighty-five patients were included in the study Indications for renal biopsy included evaluation for the nephrotic syndrome, asymptomatic proteinuria, hematuria/proteinuria, isolated hematuria or systemic disease. Fifty-one percent of the patients were white and 44 percent were black. The male/female ratio was 3.2:1. The most common etiology of the nephrotic syndrome or asymptomatic proteinuria was focal glomerular sclerosis, and was found predominantly in black males. IgA nephropathy was the most common cause of combined hematuria and proteinuria, and was not found in any black patients in 126 biopsies. Isolated hematuria was secondary to either IgA nephropathy or thin basement membrane disease in 70 percent of the biopsies. This is the first study to demonstrate such differences in glomerular disease in an American population on the basis of race and sex in a single center. RP PONTIER, PJ (reprint author), USN,MED CTR,DEPT MED,DIV NEPHROL,PORTSMOUTH,VA 23708, USA. NR 15 TC 44 Z9 46 U1 0 U2 2 PU DUSTRI-VERLAG DR KARL FEISTLE PI MUNCHEN-DEISENHOFEN PA BAHNHOFSTRABE 9 POSTFACH 49, W-8024 MUNCHEN-DEISENHOFEN, GERMANY SN 0301-0430 J9 CLIN NEPHROL JI Clin. Nephrol. PD AUG PY 1994 VL 42 IS 2 BP 79 EP 84 PG 6 WC Urology & Nephrology SC Urology & Nephrology GA PC590 UT WOS:A1994PC59000002 PM 7955582 ER PT J AU WILLIAMS, BA FLEMING, JW ZABARNICK, S AF WILLIAMS, BA FLEMING, JW ZABARNICK, S TI LASER-INDUCED FLUORESCENCE DIAGNOSTICS AND CHEMICAL KINETIC MODELING OF A CH4/NO2/O2 FLAME AT 55 TORR - COMMENT SO COMBUSTION AND FLAME LA English DT Article C1 USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375. UNIV DAYTON,RES INST,DAYTON,OH 45469. NR 10 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD AUG PY 1994 VL 98 IS 3 BP 309 EP 311 DI 10.1016/0010-2180(94)90244-5 PG 3 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA PA048 UT WOS:A1994PA04800012 ER PT J AU LEWIS, T AF LEWIS, T TI A REVERSAL OF FORTUNES SO COMPUTER LA English DT Editorial Material RP LEWIS, T (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD AUG PY 1994 VL 27 IS 8 BP 5 EP 6 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA PB819 UT WOS:A1994PB81900001 ER PT J AU SCHNEIDEWIND, NF AF SCHNEIDEWIND, NF TI VALIDATING METRICS FOR ENSURING SPACE-SHUTTLE FLIGHT SOFTWARE QUALITY SO COMPUTER LA English DT Article RP SCHNEIDEWIND, NF (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 9 TC 7 Z9 7 U1 0 U2 2 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD AUG PY 1994 VL 27 IS 8 BP 50 EP 57 DI 10.1109/2.303613 PG 8 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA PB819 UT WOS:A1994PB81900006 ER PT J AU LEWIS, TG AF LEWIS, TG TI WHERE IS COMPUTING HEADED SO COMPUTER LA English DT Article RP LEWIS, TG (reprint author), USN,POSTGRAD SCH,CODE CS,MONTEREY,CA 93943, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD AUG PY 1994 VL 27 IS 8 BP 59 EP 63 DI 10.1109/2.303615 PG 5 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA PB819 UT WOS:A1994PB81900007 ER PT J AU ROSENFELD, LK SCHWING, FB GARFIELD, N TRACY, DE AF ROSENFELD, LK SCHWING, FB GARFIELD, N TRACY, DE TI BIFURCATED FLOW FROM AN UPWELLING CENTER - A COLD-WATER SOURCE FOR MONTEREY BAY SO CONTINENTAL SHELF RESEARCH LA English DT Article ID OCEAN DYNAMICS EXPERIMENT; CALIFORNIA CURRENT SYSTEM; COASTAL TRANSITION ZONE; SEASONAL VARIABILITY; FIELD OBSERVATIONS; CONTINENTAL-SHELF; POINT ARENA; SATELLITE; CANYON; WIND AB AVHRR and CTD data from the Monterey Bay region during spring-summer 1989 show two basic hydrographic states, upwelling and relaxation. These occur in response to local wind forcing and are modified by interaction with a California Current meander. Upwelling at Pt Ano Nuevo, north of Monterey Bay, is identified as the source of cold, salty near-surface water frequently seen in the Bay. No evidence is found in any available data to support the commonly held belief that the Monterey Submarine Canyon is responsible for the introduction of upwelled water to the Bay's euphotic zone. During wind relaxations, upwelling ceases and a persistent California Current meander translates shoreward. Data support the idea that upwelling centers are associated with coastal headlands. The flow of upwelled water from these centers is bifurcated, with one tongue trending offshore and one equatorward. We propose a conceptual model to explain this pattern of flow and its impact on the California Current, C1 NOAA,NMFS,PACIFIC FISHERIES ENVIRONM GRP,MONTEREY,CA. USN,POSTGRAD SCH,MONTEREY,CA 93940. RP ROSENFELD, LK (reprint author), MONTEREY BAY AQUARIUM RES INST,PACIFIC GROVE,CA 93950, USA. NR 67 TC 184 Z9 185 U1 2 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0278-4343 J9 CONT SHELF RES JI Cont. Shelf Res. PD AUG PY 1994 VL 14 IS 9 BP 931 EP 964 DI 10.1016/0278-4343(94)90058-2 PG 34 WC Oceanography SC Oceanography GA NY724 UT WOS:A1994NY72400001 ER PT J AU LITTLE, B RAY, R HART, K WAGNER, P AF LITTLE, B RAY, R HART, K WAGNER, P TI FUNGAL-INDUCED CORROSION OF WIRE ROPE EXPOSED IN HUMID ATMOSPHERIC CONDITIONS SO CORROSION PREVENTION & CONTROL LA English DT Article AB Localized corrosion of carbon-steel wire rope stored in a humid environment on wooden spools was caused by the production of organic acid and carbon dioxide by fungi growing directly on the wood. Fungal growth was observed on the interiors of wooden spools, and corrosion was most severe on the wrap of wire in direct contact with the wood. Laboratory experiments were designed to demonstrate a causal relationship between storage conditions, fungal growth and localized corrosion. RP LITTLE, B (reprint author), USN,RES LAB,STENNIS SPACE CTR,WASHINGTON,DC 20375, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU SCIENTIFIC SURVEYS LTD PI BEACONSFIELD PA PO BOX 21, BEACONSFIELD, BUCKS, ENGLAND HP9 1NS SN 0010-9371 J9 CORROS PREVENT CONTR JI Corrosion Prev. Control PD AUG PY 1994 VL 41 IS 4 BP 89 EP 93 PG 5 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA PG591 UT WOS:A1994PG59100004 ER PT J AU HAURY, LR FEY, CL SHULENBERGER, E AF HAURY, LR FEY, CL SHULENBERGER, E TI SURFACE ENRICHMENT OF INORGANIC NUTRIENTS IN THE NORTH PACIFIC-OCEAN SO DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID NITRATE; WATERS; ENVIRONMENTS; NITROGEN AB Vertical profiles of the inorganic nutrients phosphate, silicate and nitrate show frequent surface enrichment (i.e. a sub-surface minimum) throughout the historical California Cooperative Oceanic Fisheries Investigations (CalCOFI) data set and in hydrographic sections across the North Pacific Ocean, Although present in the open ocean, it is especially pronounced in the offshore California Current and near the Hawaiian Islands, Its consistent occurrence over time, space, and methods argues that it is a real feature of the upper ocean ecosystem, rather than a result of some methodological problem. In the California Current, surface enrichment is spatially and temporally rare at nearshore stations. When nearshore enrichment does occur, minimum values are shallow (10-30 m). The subsurface minima become more frequent and deeper (eventually occurring at >100 m) the farther offshore one goes. A similar trend exists alongshore: the minima are deeper and more frequent towards the south. In all data, the enrichment is usually dearest and most frequent in silicate, weakest and least frequent in nitrate. Surface enrichment can contribute up to 100% of a specific inorganic nutrient available above the nutricline. The cause of surface enrichment is unknown: possible explanations include (1) nutrient scavenging and vertical transportation by rising particles or bubbles; (2) Langmuir circulations; (3) nutrient transport by vertically migrating organisms; (4) atmospheric inputs; (5) remineralization related to distributions of organisms with depth; or (6) photochemical processes. Because the three nutrients remineralize at different rates, this feature might be useful as a potential tracer of past or ongoing physical and biological processes in the mixed layer. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP HAURY, LR (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,MARINE LIFE RES GRP,LA JOLLA,CA 92093, USA. NR 35 TC 11 Z9 11 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0967-0637 J9 DEEP-SEA RES PT I JI Deep-Sea Res. Part I-Oceanogr. Res. Pap. PD AUG PY 1994 VL 41 IS 8 BP 1191 EP 1205 DI 10.1016/0967-0637(94)90040-X PG 15 WC Oceanography SC Oceanography GA PH179 UT WOS:A1994PH17900004 ER PT J AU JUMALE, AH WALLACE, MR BURANS, J THORNTON, S SHARP, T ALI, MM AF JUMALE, AH WALLACE, MR BURANS, J THORNTON, S SHARP, T ALI, MM TI HIGHLY RESISTANT BACTERIAL OSTEOMYELITIS IN SOMALIA SO EAST AFRICAN MEDICAL JOURNAL LA English DT Article AB Chronic osteomyelitis is a major health problem in the aftermath of the conflict in Somalia. We studied the microbiology of chronic osteomyelitis among 30 patients in a large hospital in Mogadishu. Gram-negative bacteria were Isolated from 77% of patients; most of these isolates were highly resistant to standard antibiotic agents but all were sensitive to ciprofloxacin, an oral fluoroquinolone antibiotic. Ciprofloxacin may prove useful in the management of chronic osteomyelitis due to highly resistant gramnegative bacteria. C1 USN,MED CTR,DEPT INTERNAL MED & CLIN INVEST,DIV INFECT DIS,SAN DIEGO,CA 92134. USN,MED RES INST,BETHESDA,MD. DIGFER GEN HOSP,MUQDISHO,SOMALIA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU EAST AFRICAN MEDICAL JOURNAL PI NAIROBI PA CHYULU ROAD PO BOX 41632, NAIROBI, KENYA SN 0012-835X J9 E AFR MED J JI East Afr. Med. J. PD AUG PY 1994 VL 71 IS 8 BP 501 EP 502 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA QL153 UT WOS:A1994QL15300006 PM 7867540 ER PT J AU KWON, YW BERNER, J AF KWON, YW BERNER, J TI ANALYSIS OF MATRIX DAMAGE EVOLUTION IN LAMINATED COMPOSITE PLATES SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID STIFFNESS REDUCTION; FIBROUS COMPOSITES; CRACKING AB A new model has been developed to investigate matrix cracking in laminated fibrous composite structures. The model can predict matrix cracking and its effect on stiffness reduction. It can also compute the load transfer from the cracked matrix to surrounding fibers. The model is based on the micromechanical concept of the fiber and matrix as well as the matrix material degradation concept as matrix cracking progressed. The micromechanical concept uses a rectangular cell geometry representing a fiber and its surrounding matrix while the material degradation concept uses an empirical expression of a Weibull type function. Two material constants are required for matrix cracking. The constants were obtained from an experiment on matrix cracking. With those constants, the present model predicts the matrix cracking in other cases. The predicted solutions were comparable to the experimental data. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 14 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD AUG PY 1994 VL 48 IS 6 BP 811 EP 817 DI 10.1016/0013-7944(94)90188-0 PG 7 WC Mechanics SC Mechanics GA PF960 UT WOS:A1994PF96000006 ER PT J AU SCHWARTZ, GN WARREN, MK SAKANO, K KESSLER, SW SZABO, JM PERDUE, JF AF SCHWARTZ, GN WARREN, MK SAKANO, K KESSLER, SW SZABO, JM PERDUE, JF TI EFFECT OF INSULIN-LIKE GROWTH-FACTOR-II (IGF-II) MUTANTS SPECIFIC FOR IGF-II CIM6-P OR IGF-I RECEPTORS ON IN-VITRO HEMATOPOIESIS SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 NCI,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD. DALICHI PHARM CO,TOKYO,JAPAN. AMER RED CROSS,ROCKVILLE,MD. OTSUKA AMER PHARMACEUT INC,ROCKVILLE,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD AUG PY 1994 VL 22 IS 8 BP 744 EP 744 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA PB368 UT WOS:A1994PB36800248 ER PT J AU KANAMORI, H SIEGEL, JN AF KANAMORI, H SIEGEL, JN TI ERYTHROID GENE-EXPRESSION INDUCED IN NONERYTHROID CELLS BY CELL-FUSION AND MICROCELL FUSION SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD AUG PY 1994 VL 22 IS 8 BP 749 EP 749 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA PB368 UT WOS:A1994PB36800266 ER PT J AU DAVIS, TA KIDWELL, WR LEE, KP SALVADO, AJ AF DAVIS, TA KIDWELL, WR LEE, KP SALVADO, AJ TI LARGE-SCALE EXPANSION OF HUMAN CD34+ PROGENITOR CELLS ON PORCINE ENDOTHELIAL-CELLS IN AN ARTIFICIAL CAPILLARY SYSTEM SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. CELLCO INC,GERMANTOWN,MD. NR 0 TC 1 Z9 1 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD AUG PY 1994 VL 22 IS 8 BP 802 EP 802 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA PB368 UT WOS:A1994PB36800465 ER PT J AU SANCHEZ, GI ROGERS, WO MELLOUK, S HOFFMAN, SL AF SANCHEZ, GI ROGERS, WO MELLOUK, S HOFFMAN, SL TI PLASMODIUM-FALCIPARUM - EXPORTED PROTEIN-1, A BLOOD-STAGE ANTIGEN, IS EXPRESSED IN LIVER STAGE PARASITES SO EXPERIMENTAL PARASITOLOGY LA English DT Note DE PLASMODIUM FALCIPARUM; EXP-1; LIVER STAGE PROTEIN ID MALARIA PARASITE; SPOROZOITES; HEPATOCYTES; PEPTIDE C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. PANAMER HLTH ORG,WASHINGTON,DC 20037. UNIV MARYLAND,SCH MED,CTR VACCINE DEV,BALTIMORE,MD 21201. OI Sanchez, Gloria Ines/0000-0001-5992-0475 NR 19 TC 24 Z9 24 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0014-4894 J9 EXP PARASITOL JI Exp. Parasitol. PD AUG PY 1994 VL 79 IS 1 BP 59 EP 62 DI 10.1006/expr.1994.1060 PG 4 WC Parasitology SC Parasitology GA PC640 UT WOS:A1994PC64000008 PM 8050527 ER PT J AU MASTERSON, DM AF MASTERSON, DM TI THE ORIGINS OF MILITARY REFORMISM IN LATIN-AMERICA - THE ADMINISTRATION OF TORO,DAVID IN BOLIVIA - SPANISH - GALLEGO,F SO HISPANIC AMERICAN HISTORICAL REVIEW LA English DT Book Review RP MASTERSON, DM (reprint author), USN ACAD, ANNAPOLIS, MD 21402 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU DUKE UNIV PRESS PI DURHAM PA 905 W MAIN ST, STE 18-B, DURHAM, NC 27701 USA SN 0018-2168 J9 HISPANIC AM HIST REV JI Hisp. Am. Hist. Rev. PD AUG PY 1994 VL 74 IS 3 BP 529 EP 530 PG 2 WC History SC History GA PC185 UT WOS:A1994PC18500039 ER PT J AU CHRISTIANSON, KA ROUSSOS, JA ANDERSON, WT AF CHRISTIANSON, KA ROUSSOS, JA ANDERSON, WT TI ACCELERATED LIFE TESTING AND FAILURE ANALYSIS OF SINGLE-STAGE MMIC AMPLIFIERS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID ION-IMPLANTED GAAS; POWER MESFETS; IMPACT IONIZATION; SURFACE-STATES; DLTS SPECTRA; TRANSCONDUCTANCE; SPECTROSCOPY; RELIABILITY; TRANSISTORS; BREAKDOWN AB Single stage monolithic microwave integrated circuit (MMIC) amplifiers have been high temperature accelerated life tested under dc + RF biasing conditions. Most of the circuits failed parametrically due to a gradual decrease in RF output power. Failure analysis revealed localized reduction of the gate breakdown characteristics of the metal semiconductor field effect transistor (MESFET). This was occurring through degradation of the GaAs surface Si3N4 passivation layer interface in the channel region of the MESFET, resulting in a reduction in the number of surface states. The few catastrophically failed MMIC's are believed to represent a special case of this degradation process which occurred very rapidly. In contrast to the transistor, the other components of the circuits were unchanged following life test. RP CHRISTIANSON, KA (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,REALIABIL SCI SECT,WASHINGTON,DC 20375, USA. NR 33 TC 5 Z9 5 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD AUG PY 1994 VL 41 IS 8 BP 1435 EP 1443 DI 10.1109/16.297740 PG 9 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PA610 UT WOS:A1994PA61000019 ER PT J AU MCKISSON, JE HASKINS, PS PHILLIPS, GW KING, SE AUGUST, RA PIERCEY, RB MANIA, RC AF MCKISSON, JE HASKINS, PS PHILLIPS, GW KING, SE AUGUST, RA PIERCEY, RB MANIA, RC TI DEMONSTRATION OF 3-DIMENSIONAL IMAGING WITH A GERMANIUM COMPTON CAMERA SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT Nuclear Science Symposium and Medical Imaging Conference (NSS-MIC 93) CY OCT 30-NOV 06, 1993 CL SAN FRANCISCO, CA SP IEEE ID TELESCOPE AB A proof-of-concept experiment was performed to demonstrate the three-dimensional imaging capabilities of an all-germanium Compton camera for near-field sources. Eight high purity germanium (HPGe) coaxial detectors were configured in two planes of four detectors each. The data acquisition system was assembled from available hardware and off-the-shelf electronics using standard NIM and CAMAC modules. Sixteen-parameter data were recorded event-by-event for later analysis and image reconstruction. The energy resolution of the system was 0.3% at 1333 keV. Preliminary analysis indicates the position resolution for a source at one meter and a specific detector geometry was less than a centimeter. C1 USN,RES LAB,WASHINGTON,DC 20375. SPARROW CORP,MISSISSIPPI STATE,MS 39762. KENTUCKY STATE UNIV,DIV MATH & SCI,FRANKFORT,KY 40601. RP MCKISSON, JE (reprint author), INST SPACE SCI & TECHNOL,1810 NW 16TH ST,GAINESVILLE,FL 32609, USA. NR 14 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1994 VL 41 IS 4 BP 1221 EP 1224 DI 10.1109/23.322888 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA PE028 UT WOS:A1994PE02800107 ER PT J AU CHOI, JJ ARMSTRONG, CM GANGULY, AK BARSANTI, ML AF CHOI, JJ ARMSTRONG, CM GANGULY, AK BARSANTI, ML TI DESIGN OF A 50 KW, WIDE-BAND KA-BAND SLOW-WAVE CYCLOTRON AMPLIFIER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB A two stage slow wave cyclotron amplifier is investigated to demonstrate a high power, stable, and broad Ka-band radiation source, operating at a low beam power (similar to 60 kV, similar to 5 amps) and a low magnetic field (similar to 7 kG) A linear theory predicts that the second harmonic gyro-BWO is competing in the amplifier and can be stabilized by inserting a sever in the interaction circuit. A slow-time-scale non-linear code, with a sever included, predicts a saturated gain of 24-28 dB, an efficiency of 15-17%, and an instantaneous bandwidth of 15-20% at a beam axial velocity spread of 2%. A broadband rf coupler, a mode converter, and a rf vacuum window are designed by the use of a 3-D electromagnetic, finite element code. Measured rf characteristics are in good agreement with predictions. C1 USN,RES LAB,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375. OMEGA P INC,NEW HAVEN,CT 06520. RP CHOI, JJ (reprint author), SCI APPLICAT INT CORP,MCLEAN,VA 22102, USA. NR 21 TC 7 Z9 7 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 1994 VL 22 IS 4 BP 465 EP 475 DI 10.1109/27.310656 PG 11 WC Physics, Fluids & Plasmas SC Physics GA PE336 UT WOS:A1994PE33600023 ER PT J AU DRIELS, MR SWAYZE, WE AF DRIELS, MR SWAYZE, WE TI AUTOMATED PARTIAL POSE MEASUREMENT SYSTEM FOR MANIPULATOR CALIBRATION EXPERIMENTS SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Article ID ROBOT CALIBRATION AB The work reported here is concerned with methods used to provide partial pose data for robot calibration tests. Rather than focussing on traditional, precision measurement techniques, the paper discusses calibration using end point motion constraints of various kinds. The preferred method consists of using a wire potentiometer attached to the robot tool by means of two specially designed fixtures. Suitable modeling of the measurement system as well as the internal kinematics of the manipulator allows simulation of the calibration process. Experimental results obtained in the calibration of an industrial manipulator is presented, and means to make the complete calibration process automatic is discussed. RP USN, POSTGRAD SCH, DEPT MECH ENGN, MONTEREY, CA 93943 USA. NR 27 TC 26 Z9 26 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD AUG PY 1994 VL 10 IS 4 BP 430 EP 440 DI 10.1109/70.313094 PG 11 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA PC662 UT WOS:A1994PC66200003 ER PT J AU FLIPPENANDERSON, JL DESCHAMPS, JR WARD, KB GEORGE, C HOUGHTEN, R AF FLIPPENANDERSON, JL DESCHAMPS, JR WARD, KB GEORGE, C HOUGHTEN, R TI CRYSTAL-STRUCTURE OF DELTAKEPHALIN - A DELTA-SELECTIVE OPIOID PEPTIDE WITH A NOVEL BETA-BEND-LIKE CONFORMATION SO INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH LA English DT Article DE DELTAKEPHALIN; ENKEPHALIN ANALOG; NEUROPEPTIDE; PEPTIDE CONFORMATION; X-RAY DIFFRACTION ID X-RAY-DIFFRACTION; METHIONINE-ENKEPHALIN; OPIATE; ENKEPHALIN; RECOGNITION; RECEPTORS; ANALOG; SHEET; FORM AB The solid-state structure of deltakephalin (Tyr-DThr-Gly-Phe-Leu-Thr) has been determined by single-crystal X-ray diffraction. Deltakephalin (DTLET) is a synthetic opioid peptide which differs from enkephalin in that a D-Thr has been substituted for Gly(2) and a sixth residue, L-Thr, has been added. Clear colorless plates obtained using vapor diffusion and macro-seeding crystallization techniques were monoclinic; space group C2 with a = 27.389(5), b = 9.205(2), c = 16.788(2)Angstrom, P = 98.87(2)degrees and V = 4181.4(14)Angstrom(3). The asymmetric unit contained one molecule of DTLET and six molecules of water, giving a calculated density of 1.28 g cm(-3). The crystal structure revealed that DTLET has a pseudo type I' beta-bend which is stabilized by an intramolecular side-chain to backbone hydrogen bond. This is the first reported observation of a pseudo beta-bend conformation in a solid-sate structure of an enkephalin analog. (C) Munksgaard 1994. C1 MULTIPLE PEPTIDE SYST,SAN DIEGO,CA. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,CODE 6030,WASHINGTON,DC 20375, USA. OI Deschamps, Jeffrey/0000-0001-5845-0010 NR 24 TC 14 Z9 14 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0367-8377 J9 INT J PEPT PROT RES JI Int. J. Pept. Protein Res. PD AUG PY 1994 VL 44 IS 2 BP 97 EP 104 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PD550 UT WOS:A1994PD55000001 PM 7982763 ER PT J AU BANKERT, RL AF BANKERT, RL TI CLOUD CLASSIFICATION OF AVHRR IMAGERY IN MARITIME REGIONS USING A PROBABILISTIC NEURAL-NETWORK SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID RESOLUTION TEXTURAL FEATURES; SPATIAL-RESOLUTION; PATTERN-RECOGNITION; SATELLITE IMAGERY; POLAR-REGIONS; SURFACE AB Using Advanced Very High Resolution Radiometer data, 16 pixel x 16 pixel sample areas are classified into one of ten output classes using a probabilistic neural network (PNN). The ten classes are cirrus, cirrocumulus, cirrostratus, altostratus, nimbostratus, stratocumulus, stratus, cumulus, cumulonimbus, and clear. Over 200 features drawn from spectral, textural, and physical measures are computed from the pixel data for each sample area. The input patterns presented to the neural network are a subset of these features selected by a routine that indicates the discriminatory potential of each feature. The training and testing input data used by the PNN are obtained from 95 expertly labeled images taken from seven maritime regions; these images provide 1633 sample areas. Theoretical accuracy of the PNN classifier is determined using two methods. In the hold-one-out method, the network is trained on all data samples minus one and is tested on the remaining sample. Using this technique, 79.8% of the samples are classified correctly. A bootstrap method of 100 randomly determined sample sets produces an average overall accuracy of 77.1%, with a standard deviation of 1.4%. In a more general classification using five classes (low clouds, altostratus, high clouds, precipitating clouds, and clear), 91.2% of the samples are accurately classified. A two-layer, four-network system that determines the general classification of a sample followed by a specific classification in another network is proposed. Testing of this system produces mixed results compared to the single ten-class PNN. RP BANKERT, RL (reprint author), USN,RES LAB,BOX 2,7 GRACE HOPPER AVE,MONTEREY,CA 93943, USA. NR 28 TC 93 Z9 101 U1 2 U2 5 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD AUG PY 1994 VL 33 IS 8 BP 909 EP 918 DI 10.1175/1520-0450(1994)033<0909:CCOAII>2.0.CO;2 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NZ464 UT WOS:A1994NZ46400001 ER PT J AU KYONO, CS BINARI, SC IKOSSIANASTASIOU, K AF KYONO, CS BINARI, SC IKOSSIANASTASIOU, K TI GAIN ENHANCEMENT IN ALAS INGAAS HETEROJUNCTION BIPOLAR-TRANSISTORS USING AN EMITTER LEDGE SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID SURFACE RECOMBINATION CURRENT AB Improved gain was observed at low currents when a thin emitter ledge was incorporated into npn In0.52Al0.48As/In0.53Ga0.47As heterojunction bipolar transistors. A 40-mm-thick n-In0.52Al0.48As emitter ledge resulted in over four times higher gain at low biases due to reduced surface recombination. C1 USN,RES LAB,WASHINGTON,DC 20375. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. NR 6 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1994 VL 76 IS 3 BP 1954 EP 1955 DI 10.1063/1.357654 PG 2 WC Physics, Applied SC Physics GA PA305 UT WOS:A1994PA30500092 ER PT J AU TZELEPIS, GE VEGA, DL COHEN, ME MCCOOL, FD AF TZELEPIS, GE VEGA, DL COHEN, ME MCCOOL, FD TI LUNG-VOLUME SPECIFICITY OF INSPIRATORY MUSCLE TRAINING SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE RESPIRATORY MUSCLES; STRENGTH TRAINING ID OBSTRUCTIVE PULMONARY-DISEASE; AIR-FLOW LIMITATION; MECHANICAL-PROPERTIES; HUMAN DIAPHRAGM; EXERCISE; HYPERINFLATION; ADAPTATIONS; ACTIVATION; ENDURANCE; STRENGTH AB We examined the extent to which training-related increases of inspiratory muscle (IM) strength are limited to the lung volume (VL) at which the training occurs. IM strength training consisted of performing repeated static maximum inspiratory maneuvers. Three groups of normal volunteers performed these maneuvers at one of three lung volumes: residual volume (RV), relaxation volume (Vrel), or Vrel plus one-half of inspiratory capacity (Vrel + 1/2IC). A control group did not train. We constructed maximal inspiratory pressure-VL curves before and after a 6-wk training period. For each group, we found that the greatest improvements in strength occurred at the volume at which the subjects trained and were significantly greater for those who trained at low (36% for RV and 26% for Vrel) than at high volumes (13% for Vrel + 1/2IC). Smaller increments in strength were noted at volumes adjacent to the training volume. The range of vital capacity (VC) over which strength was increased was greater for those who trained at low (70% of VC) than at high VL (20% of VC). We conclude that the greatest improvements in IM strength are specific to the VL at which training occurs. However, the increase in strength, as well as the range of volume over which strength is increased, is greater for those who trained at the lower VL. C1 CHICAGO MED SCH,DEPT MED,N CHICAGO,IL 60064. VET AFFAIRS MED CTR,DEPT MED,N CHICAGO,IL 60064. USN,DENT RES INST,GREAT LAKES,IL 60088. MEM HOSP,PAWTUCKET,RI 02860. BROWN UNIV,PAWTUCKET,RI 02860. NR 33 TC 20 Z9 21 U1 0 U2 2 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD AUG PY 1994 VL 77 IS 2 BP 789 EP 794 PG 6 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA PB787 UT WOS:A1994PB78700040 PM 8002529 ER PT J AU TZELEPIS, GE VEGA, DL COHEN, ME FULAMBARKER, AM PATEL, KK MCCOOL, FD AF TZELEPIS, GE VEGA, DL COHEN, ME FULAMBARKER, AM PATEL, KK MCCOOL, FD TI PRESSURE-FLOW SPECIFICITY OF INSPIRATORY MUSCLE TRAINING SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE RESPIRATORY MUSCLES; FORCE-VELOCITY ID OBSTRUCTIVE PULMONARY-DISEASE; HUMAN SKELETAL-MUSCLE; ISOMETRIC FORCE-TIME; FIBER CHARACTERISTICS; RELAXATION-TIME; VELOCITY; STRENGTH; ENDURANCE; POWER; FATIGUE AB The inspiratory muscles (IM) can be trained by having a subject breathe through inspiratory resistive loads or by use of unloaded hyperpnea. These disparate training protocols are characterized by high inspiratory pressure (force) or high inspiratory flow (velocity), respectively. We tested the hypothesis that the posttraining improvements in IM pressure or flow performance are specific to training protocols in a way that is similar to force-velocity specificity of skeletal muscle training. IM training was accomplished in 15 normal subjects by use of three protocols: high inspiratory pressure-no flow (group A, n = 5), low inspiratory pressure-high flow (group B, n = 5), and intermediate inspiratory pressure and flow (group C, n = 5). A control group (n = 4) did no training. Before and after training, we measured esophageal pressure (Pea) and inspiratory flow (VI) during single maximal inspiratory efforts against a range of external resistances including an occluded airway. Efforts originated below relaxation volume (Vrel), and peak Pes and VI were measured at Vrel. Isovolume maximal Pes-VI plots were constructed to assess maximal inspiratory pressure-flow performance. Group A (pressure training) performed 30 maximal static inspiratory maneuvers at Vrel daily, group B (flow training) performed 30 sets of three maximal inspiratory maneuvers with no added external resistance daily, and group C (intermediate training) performed 30 maximal inspiratory efforts on a midrange external resistance (7 mm ID) daily. Subjects trained 5 days/wk for 6 wk. Data analysis included comparison of posttraining Pes-QI slopes among training groups. After training, group A increased maximaI Pes (Pes(max); 37%) but not maximal VI (VImax) and group B increased VImax (17%) but not Pes(max); group C increased Pes(max) (19%) and VImax (14%). The posttraining slopes were dependent on the training protocol. We conclude that training protocols characterized by generating high inspiratory pressure or high inspiratory flow will specifically increase Pes(max) or VImax, respectively. In contrast, intermediate training protocols produce a more uniform increase in VImax and flow. C1 CHICAGO MED SCH,DEPT MED,N CHICAGO,IL 60064. VET AFFAIRS MED CTR,DEPT MED,N CHICAGO,IL 60064. USN,DENT RES INST,GREAT LAKES,IL 60088. BROWN UNIV,PAWTUCKET,RI 02860. NR 32 TC 21 Z9 21 U1 0 U2 1 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD AUG PY 1994 VL 77 IS 2 BP 795 EP 801 PG 7 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA PB787 UT WOS:A1994PB78700041 PM 8002530 ER PT J AU OLSEN, EA AF OLSEN, EA TI THE USA AND THE RISE OF EAST-ASIA SINCE 1945 - DILEMMAS OF THE POSTWAR INTERNATIONAL POLITICAL-ECONOMY - HERSH,J SO JOURNAL OF ASIAN STUDIES LA English DT Book Review RP OLSEN, EA (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ASSN ASIAN STUDIES INC PI ANN ARBOR PA UNIV MICH 1 LANE HALL, ANN ARBOR, MI 48109 SN 0021-9118 J9 J ASIAN STUD JI J. Asian Stud. PD AUG PY 1994 VL 53 IS 3 BP 899 EP 901 DI 10.2307/2059741 PG 3 WC Area Studies; Asian Studies SC Area Studies; Asian Studies GA PM014 UT WOS:A1994PM01400017 ER PT J AU TRUST, TJ LOGAN, SM GUSTAFSON, CE ROMANIUK, PJ KIM, NW CHAN, VL RAGAN, MA GUERRY, P GUTELL, RR AF TRUST, TJ LOGAN, SM GUSTAFSON, CE ROMANIUK, PJ KIM, NW CHAN, VL RAGAN, MA GUERRY, P GUTELL, RR TI PHYLOGENETIC AND MOLECULAR CHARACTERIZATION OF A 23S RIBOSOMAL-RNA GENE POSITIONS THE GENUS CAMPYLOBACTER IN THE EPSILON-SUBDIVISION OF THE PROTEOBACTERIA AND SHOWS THAT THE PRESENCE OF TRANSCRIBED SPACERS IS COMMON IN CAMPYLOBACTER SPP SO JOURNAL OF BACTERIOLOGY LA English DT Article ID RIBOSOMAL-RNA GENES; CHAIN-REACTION AMPLIFICATION; PHYSICAL MAP; SP-NOV; INTERVENING SEQUENCES; JEJUNI TGH9011; ACID SEQUENCE; 16S; HELICOBACTER; GENOME AB The nucleotide sequence of a 23S rRNA gene of Campylobacter coli VC167 was determined. The primary sequence of the C. coli 23S rRNA was deduced, and a secondary-structure model was constructed. Comparison with Escherichia coli 23S rRNA showed a major difference in the C. coli rRNA at approximately position 1170 (E. coli numbering) in the form of an extra sequence block approximately 147 bp long. PCR analysis of 31 other strains of C. coli and C. jejuni showed that 69% carried a transcribed spacer of either ca, 147 or ca. 37 bp. Comparison of all sequenced Campylobacter transcribed spacers showed that the Campylobacter inserts were related in sequence and percent G+C content. All Campylobacter strains carrying transcribed spacers in their 23S rRNA genes produced fragmented 23S rRNAs. Other strains which produced unfragmented 23S rRNAs did not appear to carry transcribed spacers at this position in their 23S rRNA genes. At the 1850 region (E. coli numbering), Campylobacter 23S rRNA displayed a base pairing signature most like that of the beta and gamma subdivisions of the class Proteobacteria, but in the 270 region, Campylobacter 23S rRNA displayed a helix signature which distinguished it from the alpha, beta, and gamma subdivisions. Phylogenetic analysis comparing C. coli VC167 23S rRNA and a C. jejuni TGH9011 (ATCC 43431) 23S rRNA with 53 other completely sequenced (eu)bacterial 23S rRNAs showed that the two campylobacters form a sister group to the alpha, beta, and gamma proteobacterial 23S rRNAs, a positioning consistent with the idea that the genus Campylobacter belongs to the epsilon subdivision of the class Proteobacteria. C1 UNIV TORONTO,DEPT MICROBIOL,TORONTO M5S 1A8,ON,CANADA. NATL RES COUNCIL CANADA,INST MARINE BIOSCI,HALIFAX B3H 3Z1,NS,CANADA. USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20814. UNIV COLORADO,MCD BIOL,BOULDER,CO 80309. RP TRUST, TJ (reprint author), UNIV VICTORIA,DEPT BIOCHEM & MICROBIOL,VICTORIA V8W 3P6,BC,CANADA. RI Ragan, Mark/A-9825-2014 OI Ragan, Mark/0000-0003-1672-7020 FU NIGMS NIH HHS [GM 48207, R01 GM048207] NR 65 TC 57 Z9 57 U1 1 U2 4 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD AUG PY 1994 VL 176 IS 15 BP 4597 EP 4609 PG 13 WC Microbiology SC Microbiology GA NY398 UT WOS:A1994NY39800017 PM 8045890 ER PT J AU SAVARINO, SJ FOX, P DENG, YK NATARO, JP AF SAVARINO, SJ FOX, P DENG, YK NATARO, JP TI IDENTIFICATION AND CHARACTERIZATION OF A GENE-CLUSTER MEDIATING ENTEROAGGREGATIVE ESCHERICHIA-COLI AGGREGATIVE ADHERENCE FIMBRIA-I BIOGENESIS SO JOURNAL OF BACTERIOLOGY LA English DT Article ID NUCLEOTIDE-SEQUENCE; DIFFUSE ADHERENCE; YERSINIA-PESTIS; HEP-2 CELLS; DIARRHEA; ADHESIN; PROTEIN; STRAINS; TOXIN; PATTERNS AB The aggregative pattern of adherence (AA) exhibited by enteroaggregative Escherichia coli upon HEp-2 cells is a plasmid-associated property which correlates with aggregative adherence fimbria I (AAF/I) expression and human erythrocyte hemagglutination. By using cloning and mutagenesis strategies, two noncontiguous plasmid segments (designated regions 1 and 2) required for AA expression have previously been identified in enteroaggregative E. coli 17-2. TnphoA mutagenesis was performed on clones containing region 1, and 16. TnphoA mutants which were negative for the AA phenotype were analyzed. The TnphoA insertion site for each mutant was determined by junctional DNA sequencing. All 16 mutations occurred within a 4.6-kb span in region 1. Nucleotide sequence analysis of the region revealed four contiguous open reading frames, designated aggDCBA, in the same span. AA-negative TnphoA insertions into all open reading frames except aggB were obtained. On the basis of mutational analysis and protein homology data, it is inferred that aggA, aggC, and aggD are involved in biogenesis of AAF/I, encoding a major fimbrial subunit, outer membrane usher, and periplasmic fimbrial chaperone, respectively. By immunogold electron microscopy, polyclonal antiserum raised against the aggA gene product decorated AAF/I fimbriae, affirming that AggA encodes an AAF/I subunit. C1 USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD. GEOCENTERS INC,FT WASHINGTON,MD 20744. UNIV MARYLAND,SCH MED,CTR VACCINE DEV,BALTIMORE,MD 21201. FU NIAID NIH HHS [1R29-AI-33906] NR 49 TC 79 Z9 84 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD AUG PY 1994 VL 176 IS 16 BP 4949 EP 4957 PG 9 WC Microbiology SC Microbiology GA PA426 UT WOS:A1994PA42600021 PM 7914189 ER PT J AU KULESH, DA ANDERSON, LH WILSON, B OTIS, EJ ELGIN, DM BARKER, MJ MEHM, WJ KEARNEY, GP AF KULESH, DA ANDERSON, LH WILSON, B OTIS, EJ ELGIN, DM BARKER, MJ MEHM, WJ KEARNEY, GP TI SPACE-SHUTTLE FLIGHT (STS-45) OF L8 MYOBLAST CELLS RESULTS IN THE ISOLATION OF A NONFUSING CELL-LINE VARIANT SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Article DE MUSCLE; MYOGENESIS; SPACE SHUTTLE; CELL CULTURE; MICROGRAVITY; NEOPLASTIC TRANSFORMATION; CARTRIDGE ID LOOP-HELIX PROTEINS; MUSCLE DEVELOPMENT; GENE-EXPRESSION; MYOD FAMILY; DIFFERENTIATION; GROWTH; TRANSFORMATION; GRAVITY; RAT; MYOGENESIS AB Myoblast cell cultures have been widely employed in conventional (Ig) studies of biological processes because characteristics of intact muscle can be readily observed in these cultured cells. We decided to investigate the effects of spaceflight on muscle by utilizing a well characterized myoblast cell line (L8 rat myoblasts) as cultured in the recently designed Space Tissue Loss Flight Module ''A'' (STL-A). The STL-A is a ''state of the art,'' compact, fully contained, automated cell culture apparatus which replaces a single mid-deck locker on the Space Shuttle, The L8 cells were successfully flown in the STL-A on the Space Shuttle STS-45 mission. Upon return to earth, reculturing of these spaceflown L8 cells (L8SF) resulted in their unexpected failure to fuse and differentiate into myotubes. This inability of the L8SF cells to fuse was found to be a permanent phenotypic alteration. Scanning electron microscopic examination of L8SF cells growing at 1g on fibronectin-coated polypropylene fibers exhibited a strikingly different morphology as compared to control cells. In addition to their failure to fuse into myotubes, L8SF cells also piled up on top of each other. When assayed in fusion-promoting soft agar, L8SF cells gave rise to substantially more and larger colonies than did either preflight (L8AT) or ground control (L8GC) cells. All data to this point indicate that flying L8 rat myoblasts on the Space Shuttle for a duration of 7-10 d at subconfluent densities results in several permanent phenotypic alterations in these cells. (C) 1994 Wiley-Liss, Inc. C1 WALTER REED ARMY MED CTR,DIV SURG,WASHINGTON,DC 20307. TULANE UNIV,SCH MED,NEW ORLEANS,LA 70118. USN ACAD,ANNAPOLIS,MD 21402. RP KULESH, DA (reprint author), USAF,INST PATHOL ANAT,BSC,CPWP,DIV ALTITUDE & HYPERBAR PHYSIOL,WASHINGTON,DC 20306, USA. NR 48 TC 12 Z9 12 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD AUG PY 1994 VL 55 IS 4 BP 530 EP 544 DI 10.1002/jcb.240550412 PG 15 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA PB452 UT WOS:A1994PB45200011 PM 7962182 ER PT J AU PEAVY, G JACOBS, D SALMON, DP BUTTERS, N DELIS, DC TAYLOR, M MASSMAN, P STOUT, JC HEINDEL, WC KIRSON, D ATKINSON, JH CHANDLER, JL GRANT, I VELIN, RA OLDFIELD, EC WALLACE, MR MALONE, J AF PEAVY, G JACOBS, D SALMON, DP BUTTERS, N DELIS, DC TAYLOR, M MASSMAN, P STOUT, JC HEINDEL, WC KIRSON, D ATKINSON, JH CHANDLER, JL GRANT, I VELIN, RA OLDFIELD, EC WALLACE, MR MALONE, J TI VERBAL MEMORY PERFORMANCE OF PATIENTS WITH HUMAN-IMMUNODEFICIENCY-VIRUS INFECTION - EVIDENCE OF SUBCORTICAL DYSFUNCTION SO JOURNAL OF CLINICAL AND EXPERIMENTAL NEUROPSYCHOLOGY LA English DT Article ID AIDS DEMENTIA COMPLEX; HUNTINGTONS-DISEASE; HIV-INFECTION; NEUROPSYCHOLOGICAL PERFORMANCE; ALZHEIMERS-DISEASE; HOMOSEXUAL MEN; WHITE MATTER; ABNORMALITIES; RECOGNITION; INDIVIDUALS AB In the present study, the California Verbal Learning Test (CVLT) was administered to symptomatic HIV+ (n = 31), asymptomatic HIV+ (n = 94), and HIV-normal control (HIV-NC) (n = 40) subjects to assess the prevalence and nature of their verbal memory deficits. Symptomatic HIV+ subjects were significantly impaired relative to HIV-control subjects on CVLT measures of acquisition and retention, and were significantly less likely than control subjects to use a semantic clustering strategy to support recall. The performance of the asymptomatic HIV+ subjects fell between those of the symptomatic HIV+ subjects and HIV-controls on almost every CVLT measure. A linear discriminant function analysis (DFA) was used to compare the performances of these three groups to Alzheimer's disease (AD), Huntington's disease (HD), and normal control (NC) subjects on three CVLT measures, including total recall over five learning trials, intrusion errors, and a derived score of delayed recognition discriminability minus the final learning trial. Significant differences were found between the number of symptomatic HIV+ subjects classified as HD (32%), AD (3%), and normal (65%), the number of asymptomatic HIV+ subjects classified as HD (16%), AD (1%), and normal (83%), and the number of HIV-NC subjects classified as HD (2%), AD (0%), and normal (98%). The profile of verbal memory deficits exhibited by the subgroup of impaired HIV+ subjects was similar to that of patients with HD, a prototypical subcortical dementia, and different from that of patients with AD, a prototypical cortical dementia. This finding is consistent with reports of the predominance of subcortical neuropathological changes associated with HIV infection. C1 VET AFFAIRS MED CTR,SAN DIEGO,CA 92161. COLUMBIA UNIV,GERTRUDE H SERGIEVSKY CTR,NEW YORK,NY 10027. SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182. UNIV HOUSTON,HOUSTON,TX. BROWN UNIV,PROVIDENCE,RI 02912. USN HOSP,SAN DIEGO,CA 92134. RP PEAVY, G (reprint author), UNIV CALIF SAN DIEGO,ALZHEIMERS DIS RES CTR,9500 GILMAN DR 0948,LA JOLLA,CA 92093, USA. FU NIMH NIH HHS [5 R01 MH45688, 5 R01 MH43298, IMH 5 P50 MH45294] NR 52 TC 95 Z9 97 U1 1 U2 2 PU SWETS ZEITLINGER PUBLISHERS PI LISSE PA P O BOX 825, 2160 SZ LISSE, NETHERLANDS SN 1380-3395 J9 J CLIN EXP NEUROPSYC JI J. Clin. Exp. Neuropsychol. PD AUG PY 1994 VL 16 IS 4 BP 508 EP 523 DI 10.1080/01688639408402662 PG 16 WC Psychology, Clinical; Clinical Neurology; Psychology SC Psychology; Neurosciences & Neurology GA NW682 UT WOS:A1994NW68200003 PM 7962355 ER PT J AU NORDQUIST, PER HENRY, RL BLAKEMORE, JS SABAN, SB GORMAN, RJ AF NORDQUIST, PER HENRY, RL BLAKEMORE, JS SABAN, SB GORMAN, RJ TI ANNEALING OF GAAS GROWN BY VERTICAL ZONE-MELTING SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID ELECTRICAL-PROPERTIES AB Semi-insulating GaAs grown by the vertical zone melting (VZM) method has a low density of etch pits (about (1-4) x 10(3) cm-2), but a low concentration of EL2 (about 7 x 10(15) cm-3). We find that annealing VZM GaAs by either a two-step or by a one-step process increases mobility and raises the EL2 concentration to 14 x 10(15) cm-3, while the etch pit density remains low. The annealing works equally well whether applied as a post-growth process or as an in-situ procedure done during cool-down from the crystal growth temperature. In the in-situ process, cooling the crystal to about 600-degrees-C before reheating is essential for the increases in mobility and EL2 to occur. C1 WESTERN WASHINGTON UNIV,BELLINGHAM,WA 98225. RP NORDQUIST, PER (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD AUG PY 1994 VL 141 IS 3-4 BP 343 EP 346 DI 10.1016/0022-0248(94)90235-6 PG 4 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA PD996 UT WOS:A1994PD99600004 ER PT J AU LUCK, SJ HILLYARD, SA MOULOUA, M WOLDORFF, MG CLARK, VP HAWKINS, HL AF LUCK, SJ HILLYARD, SA MOULOUA, M WOLDORFF, MG CLARK, VP HAWKINS, HL TI EFFECTS OF SPATIAL CUEING ON LUMINANCE DETECTABILITY - PSYCHOPHYSICAL AND ELECTROPHYSIOLOGICAL EVIDENCE FOR EARLY SELECTION SO JOURNAL OF EXPERIMENTAL PSYCHOLOGY-HUMAN PERCEPTION AND PERFORMANCE LA English DT Article ID EVENT-RELATED POTENTIALS; LETTER RECOGNITION ACCURACY; BILATERAL STIMULUS ARRAYS; INDEX FOCUSED ATTENTION; ABRUPT VISUAL ONSETS; SEARCH; DISCRIMINATION; MODULATION; LOCATION; BRAIN AB Three experiments were conducted to determine whether attention-related changes in luminance detectability reflect a modulation of early sensory processing. Experiments 1 and 2 used peripheral cues to direct attention and found substantial effects of cue validity on target detectability; these effects were consistent with a sensory-level locus of selection but not with certain memory- or decision-level mechanisms. In Experiment 3, event-related brain potentials were recorded in a similar paradigm using central cues, and attention was found to produce changes in sensory-evoked brain activity beginning within the 1st 100 ms of stimulus processing. These changes included both an enhancement of sensory responses to attended stimuli and a suppression of sensory responses to unattended stimuli; the enhancement and suppression effects were isolated to different neural responses, indicating that they may arise from independent attentional mechanisms. C1 UNIV CALIF SAN DIEGO,DEPT NEUROSCI,LA JOLLA,CA 92093. CATHOLIC UNIV AMER,DEPT PSYCHOL,WASHINGTON,DC 20064. OFF NAVAL RES,PERCEPTUAL SCI PROGRAM,ARLINGTON,VA 22217. RI Clark, Vincent/B-3343-2010 OI Clark, Vincent/0000-0002-9151-2102 FU NIMH NIH HHS [MH-25594]; PHS HHS [17778] NR 74 TC 326 Z9 339 U1 5 U2 23 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0096-1523 J9 J EXP PSYCHOL HUMAN JI J. Exp. Psychol.-Hum. Percept. Perform. PD AUG PY 1994 VL 20 IS 4 BP 887 EP 904 DI 10.1037/0096-1523.20.4.887 PG 18 WC Psychology; Psychology, Experimental SC Psychology GA NX812 UT WOS:A1994NX81200014 PM 8083642 ER PT J AU MEMORY, SB CHILMAN, SV MARTO, PJ AF MEMORY, SB CHILMAN, SV MARTO, PJ TI NUCLEATE POOL BOILING OF A TURBO-B BUNDLE IN R-113 SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE BOILING; FINNED SURFACES; REFRIGERATION ID CONVECTION HEAT-TRANSFER; TUBE BUNDLE; HORIZONTAL CYLINDERS; CROSS-FLOW; PARALLEL; ARRAY AB Heat transfer measurements were made during nucleate boiling of R-113 from a bundle of 15 electrically heated, copper TURBO-B tubes arranged in an equilateral triangular pitch, designed to simulate a portion of a flooded evaporator. Five of the tubes that were oriented in a vertical array on the centerline of the bundle were each instrumented with six wall thermocouples. For increasing heat flux, the incipient boiling wall superheat of upper tubes decreased as lower tubes were activated. In the boiling region at low heat fluxes (almost-equal-to 1 kW/m2), the average bundle heat transfer coefficient was 4.6 times that obtained for a smooth tube bundle (under identical conditions) and 1. 6 times greater than that obtained for a single TURBO-B tube; a similar bundle factor has been reported for a smooth tube bundle. At high heat fluxes (100 k W/m2), the average bundle heat transfer coefficient was 3.6 times that of a smooth tube bundle. Furthermore, there was still a significant bundle factor (1.22), contrary to a smooth tube bundle, where all effect of lower tubes was eliminated at high heat fluxes. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940. RP MEMORY, SB (reprint author), UNIV MIAMI,DEPT MECH ENGN,CORAL GABLES,FL 33124, USA. NR 38 TC 23 Z9 23 U1 2 U2 5 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD AUG PY 1994 VL 116 IS 3 BP 670 EP 678 DI 10.1115/1.2910921 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA PD421 UT WOS:A1994PD42100019 ER PT J AU FRANKLIN, ME DORMAN, JP SCHUESSLER, WW AF FRANKLIN, ME DORMAN, JP SCHUESSLER, WW TI LAPAROSCOPIC TREATMENT OF GALLSTONE ILEUS - A CASE-REPORT AND REVIEW OF THE LITERATURE SO JOURNAL OF LAPAROENDOSCOPIC SURGERY LA English DT Note ID ENDOSCOPIC SPHINCTEROTOMY; LITHOTRIPSY AB We report our experience with laparoscopic surgical treatment of gallstone ileus, along with cholecystectomy and repair of a cholecystoduodenal fistula. The technique and advantages are discussed. To our knowledge, this is the first such case done laparoscopically to be reported in the world literature. C1 UNIV TEXAS,HLTH SCI CTR,TEXAS ENDOSURG EDUC FDN,SAN ANTONIO,TX. USN HOSP,SAN DIEGO,CA 92152. NR 16 TC 21 Z9 22 U1 0 U2 1 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 1052-3901 J9 J LAPAROENDOSC SURG JI J. Laparoendosc. Surg. PD AUG PY 1994 VL 4 IS 4 BP 265 EP 272 DI 10.1089/lps.1994.4.265 PG 8 WC Surgery SC Surgery GA PL777 UT WOS:A1994PL77700006 PM 7949386 ER PT J AU MARSHALL, GN WORTMAN, CB VICKERS, RR KUSULAS, JW HERVIG, LK AF MARSHALL, GN WORTMAN, CB VICKERS, RR KUSULAS, JW HERVIG, LK TI THE 5-FACTOR MODEL OF PERSONALITY AS A FRAMEWORK FOR PERSONALITY-HEALTH RESEARCH SO JOURNAL OF PERSONALITY AND SOCIAL PSYCHOLOGY LA English DT Article ID LIFE EVENTS; HARDINESS; DIMENSIONS; OPTIMISM; CONSTRUCTS; VALIDATION; PESSIMISM; VALIDITY; SCALES; MOOD AB The NEO Five Factor Personality Inventory (NEO-FFI; Costa & McCrae, 1989) and representative personality scales drawn from health psychology were administered to 2 samples of male military recruits (Ns = 296 and 502). Factor analysis of health-related personality scales revealed 3 conceptually meaningful domains. Examination of these domains and their constituent scales, with reference to the 5-factor model of personality, permits 3 general conclusions. First, most health-relevant dimensions and scales appear to be complex mixtures of broad personality domains. Second, variation in many health-related personality instruments is explained to a significant degree by the 5-factor model. Third, 2 of the 5 personality domains (i.e., conscientiousness and openness) appear to be substantially neglected in health psychology research. C1 SUNY STONY BROOK,DEPT PSYCHOL,STONY BROOK,NY 11794. USN,HLTH RES CTR,GEO CTR INC,SAN DIEGO,CA 92132. RI Vollrath, Margarete/G-1297-2011 NR 58 TC 143 Z9 144 U1 1 U2 13 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0022-3514 J9 J PERS SOC PSYCHOL JI J. Pers. Soc. Psychol. PD AUG PY 1994 VL 67 IS 2 BP 278 EP 286 DI 10.1037/0022-3514.67.2.278 PG 9 WC Psychology, Social SC Psychology GA PC245 UT WOS:A1994PC24500009 PM 7932063 ER PT J AU DEPPE, J WALLIS, RF NACHEV, I BALKANSKI, M AF DEPPE, J WALLIS, RF NACHEV, I BALKANSKI, M TI 2-DIMENSIONAL HOPPING DIFFUSION ACROSS MATERIAL INTERFACES SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE INTERFACES; DIFFUSION; TRANSPORT PROPERTIES ID GRAIN-BOUNDARIES; GROWTH; CONDUCTIVITY; SIMULATION; LI2SO4 AB We investigate two two-dimensional (2D) models of ion diffusion across material interfaces. The geometry of the interface is appropriate to the separator-cathode interface in solid state batteries. The first model is a deterministic lattice gas (LG) model explicitly including the site blocking effect; the second employs an atomistic (stochastic) kinetic Monte-Carlo (KMC) simulation. We include an energy barrier, allow an ion-ion Coulomb interaction and investigate the effect of a chemical potential, found by solving Laplace's equation with an applied potential in a geometry representing the battery. We use overvoltage measurements on InSe and dielectric loss measurements on B2O3-0.5Li2O-0.15Li2SO4 to determine the hopping rates in the two materials. Numerical Numerical results are presented for several values of the energy barrier, and two values of the applied potential both with and without the Coulomb interaction. The results of the two models are similar; quantitative differences are discussed within the context of the models. It is found that charging effects change the nature and relative importance of the effects of the other parameters in the problem. Therefore, a determination of the true Debye screening length, and therefore the number density of charge carriers, seems crucial. C1 UNIV PIERRE & MARIE CURIE, PHYS SOLIDES LAB, F-75252 PARIS 05, FRANCE. UNIV CALIF IRVINE, INST SURFACE & INTERFACE SCI, IRVINE, CA 92717 USA. UNIV CALIF IRVINE, DEPT PHYS, IRVINE, CA 92717 USA. RP DEPPE, J (reprint author), USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. NR 24 TC 8 Z9 8 U1 1 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 EI 1879-2553 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD AUG PY 1994 VL 55 IS 8 BP 759 EP 766 DI 10.1016/0022-3697(94)90028-0 PG 8 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA PM035 UT WOS:A1994PM03500013 ER PT J AU SIMS, JA BRZYSKI, R HANSEN, K CODDINGTON, CC AF SIMS, JA BRZYSKI, R HANSEN, K CODDINGTON, CC TI USE OF GONADOTROPIN-RELEASING-HORMONE AGONIST BEFORE VAGINAL SURGERY FOR CERVICAL LEIOMYOMAS - A REPORT OF 2 CASES SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Note DE LEIOMYOMA; CERVIX NEOPLASMS; GONADOTROPINS ID LEUPROLIDE ACETATE DEPOT; DOUBLE-BLIND; UTERI AB Two cases of cervical myoma were treated with combined medical/surgical therapy using,oa gonadotropin releasing hormone agonist (GnRH-a) and transvaginal cervical myomectomy. Patients were treated with depot GnRH-a (leuprolide acetate) for two months followed by myomectomy. This approach allowed successful treatment with short hospitalization (<24 hours). potential benefits of this regimen include decreased intraoperative blood loss, outpatient management, decreased morbidity, decreased hospital expense and preservation of reproductive potential by avoiding hysterectomy. C1 EASTERN VIRGINIA MED SCH,JONES INST REPROD MED,DEPT OBSTET & GYNECOL,NORFOLK,VA 23507. USN,REG MED CTR,PORTSMOUTH,VA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0024-7758 J9 J REPROD MED JI J. Reprod. Med. PD AUG PY 1994 VL 39 IS 8 BP 660 EP 662 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA PC928 UT WOS:A1994PC92800020 PM 7996536 ER PT J AU JAKLIC, BR GALBO, C GHOSH, BC AF JAKLIC, BR GALBO, C GHOSH, BC TI PNEUMOCYSTOGRAPHY FOR CYSTIC BREAST-LESIONS SO JOURNAL OF SURGICAL ONCOLOGY LA English DT Note C1 USN,NATL MED CTR,DEPT RADIOL,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,DEPT SURG ONCOL,BETHESDA,MD 20889. RP JAKLIC, BR (reprint author), USN,NATL MED CTR,DEPT SURG,BETHESDA,MD 20889, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0022-4790 J9 J SURG ONCOL JI J. Surg. Oncol. PD AUG PY 1994 VL 56 IS 4 BP 251 EP 251 DI 10.1002/jso.2930560411 PG 1 WC Oncology; Surgery SC Oncology; Surgery GA PC130 UT WOS:A1994PC13000009 PM 8057653 ER PT J AU YANG, TC YATES, TW AF YANG, TC YATES, TW TI SCATTERING FROM AN OBJECT IN A STRATIFIED MEDIUM .1. FREQUENCY DISPERSION AND ACTIVE LOCALIZATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVE-GUIDE; ACOUSTIC SCATTERING; REVERBERATION; RANGE AB A signal scattered from an extended object is often very different from a point source signal emitted from the object. Hence active localization based on matched-field/mode processing may not be feasible, depending on how the signal is modified by scattering. In a stratified medium in which propagation of a signal can be expressed in terms of normal modes, the effect of scattering is to induce mode coupling-an incident normal mode is converted to a series of outgoing normal modes by the scatterer. This mode coupling is examined by ensonifying the object with a broadband pulse at some distance from the object. The time-frequency dispersion of a scattered signal is compared with the dispersion of a passive signal traveling the same path (with the scatterer absent). One finds that the coupled normal modes (created by scattering) arrive at a different time than the uncoupled (original) normal modes and can be identified using time-frequency analysis. For active source localization broadband matched-mode processing is applied to the scattered signal. It should be noted that in many problems, the often unknown scattering function (of an unidentified object) prevents one from calculating the replica field for a scattered signal that is required for matched-field processing. For some problems, the relative phase distortion between the modes due to scattering is minimal even though made coupling is significant. For these cases, matched-mode processing successfully localizes the target; matched-mode processing can tolerate the lack of specific knowledge about the scattering function. Both incoherent and coherent broadband active processing are investigated. In general, one can expect two peaks in the active range and depth ambiguity surface corresponding to the locations of the target and the active source. C1 VECTOR RES CO,ROCKVILLE,MD 20852. RP YANG, TC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 28 TC 10 Z9 16 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1994 VL 96 IS 2 BP 1003 EP 1019 DI 10.1121/1.410379 PN 1 PG 17 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PB503 UT WOS:A1994PB50300042 ER PT J AU YANG, TC YATES, TW AF YANG, TC YATES, TW TI SCATTERING FROM AN OBJECT IN A STRATIFIED MEDIUM .2. EXTRACTION OF SCATTERING SIGNATURE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVE-GUIDE; ACOUSTIC SCATTERING AB This paper investigates methods to extract and/or characterize the scattering signature of an object in a stratified medium based on data received on a vertical array. Scattering by an object in free space transforms the incident (plane-wave) field into a scattered field with a characteristic angular distribution. The scattering function can be estimated by correlating the scattered field with the incident field over a domain of incident and scattered angles. In an ocean waveguide, the acoustic field incident on the (submerged) object involves many multipath arrivals. Likewise, the scattered field from the object is modified by multipath propagation from the scatterer to the receiver array. Hence, extraction of the scattering function requires a method to deconvolve the channel transfer function from the received data. As the scattering function is a function of both the incident and scattered angles, a comprehensive characterization requires data covering a range of incident and scattered angles. For a distant target, a vertical array of sources and receivers is considered in order to invert for the scattering function. But the data are limited to shallow incident and scattering angles since high angle arrivals are severely attenuated in a shallow water waveguide. For practical problems, a holographic image of the scatterer is proposed for target classification. C1 VECTOR RES CO,ROCKVILLE,MD 20852. RP YANG, TC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 8 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1994 VL 96 IS 2 BP 1020 EP 1031 DI 10.1121/1.411307 PN 1 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PB503 UT WOS:A1994PB50300043 ER PT J AU HO, JM COUCHMAN, LS AF HO, JM COUCHMAN, LS TI APPROXIMATE RAY SYNTHESIS OF THE SURFACE FIELDS OF A SUBMERGED ELASTIC CYLINDRICAL-SHELL WITH HEMISPHERICAL ENDCAPS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOMMERFELD-WATSON TRANSFORMATION; 3-DIMENSIONAL GREENS-FUNCTION; ACOUSTIC SCATTERING; SPHERICAL-SHELL; BACKSCATTERING; WAVES AB Combining the available ray acoustic algorithms descriptive of submerged cylindrical and spherical shells, this paper formulates the pressure and velocity distributions on a hemispherically capped cylindrical shell which is immersed in an acoustic fluid and insonified by an obliquely incident plane wave. As the first ray acoustic model for a noncanonical (nonseparable) shell geometry of considerable current interest, it neglects wave coupling and diffraction due to curvature discontinuities at the junctures as well as contributions from the leaky waves excited through the endcaps. Nevertheless, by matching the surface wave vectors along the joints, due account is taken of leaky wave propagation on, and radiation from, the hemispheres. The total pressure or velocity on the cylinder-their ray constituents are related to each other by appropriate impedances-is then synthesized by a modified geometrical acoustics field, as developed recently, and a supersonic membrane wave field. The latter is contributed by the surface leaky rays successively traveling to the observer along helical trajectories and great circles on the cylinder and hemispheres; such rays are excited through phase matching by a series of incident rays, which are in turn identified by reciprocal ray tracing so as to quantify the leaky wave contribution. Numerical implementation is also performed here. The results are compared with the reference solution generated at the Naval Research Laboratory (NRL) by boundary element/finite element codes. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HO, JM (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 31 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1994 VL 96 IS 2 BP 1104 EP 1115 DI 10.1121/1.411394 PN 1 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PB503 UT WOS:A1994PB50300050 ER PT J AU KO, SH AF KO, SH TI THE FLUSH-MOUNTED HYDROPHONE ARRAY RESPONSE TO A MODIFIED CORCOS TURBULENT WALL-PRESSURE SPECTRUM (ANALYTICAL APPROACH) SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB An analytical development for determination of the frequency spectral density that gives the response of a hydrophone array mounted on a rigid surface to a modified Corcos turbulent wall pressure spectrum is presented. The double integral that represents the frequency spectral density is replaced by the product of two single integrals. The evaluation of the single integral is based on the contour integral (residue) method. Numerically integrated results compare favorably with the results calculated using the exact expression presented here. RP KO, SH (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT,NEW LONDON,CT 06320, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1994 VL 96 IS 2 BP 1198 EP 1201 DI 10.1121/1.410331 PN 1 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA PB503 UT WOS:A1994PB50300063 ER PT J AU JOHNSON, CE WEIMER, WA AF JOHNSON, CE WEIMER, WA TI GAS-PHASE PRECURSORS TO DIAMOND AND THE SP2 CARBON IMPURITY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article; Proceedings Paper CT Meeting of the Electrochemical-Society CY MAY 16-21, 1993 CL HONOLULU, HI SP ELECTROCHEM SOC ID CHEMICAL VAPOR-DEPOSITION; ACETYLENE; GROWTH; METHANE; MECHANISM AB Diamond film deposition studies were carried out in a microwave plasma reactor using feed gases containing methane and acetylene with one reagent labeled with carbon-13. Stable gas-phase species and their carbon-13 content were characterized by downstream mass spectrometry. Raman spectroscopy along with curve-fitting analysis was used to determine the carbon-13 content of diamond and the sp2 carbon impurity Diamond and the sp2 carbon impurity-originated predominantly from methane and/or methyl radical, as opposed to acetylene. Thus, it appears that the differentiation between diamond and sp-2 carbon formation occurs on the growth surface, and not in the gas phase. RP JOHNSON, CE (reprint author), USN,CTR AIR WARFARE,DIV WEAP DIV CHEM,CHINA LAKE,CA 93555, USA. NR 17 TC 5 Z9 5 U1 0 U2 0 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD AUG PY 1994 VL 141 IS 8 BP 2161 EP 2165 DI 10.1149/1.2055079 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PA463 UT WOS:A1994PA46300038 ER PT J AU WATTS, DM ELTIGANI, A BOTROS, BAM SALIB, AW OLSON, JG MCCARTHY, M KSIAZEK, TG AF WATTS, DM ELTIGANI, A BOTROS, BAM SALIB, AW OLSON, JG MCCARTHY, M KSIAZEK, TG TI ARTHROPOD-BORNE VIRAL-INFECTIONS ASSOCIATED WITH A FEVER OUTBREAK IN THE NORTHERN PROVINCE OF SUDAN SO JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article DE ARBOVIRUSES; FEVER; SUDAN AB An outbreak of acute febrile illness occurred during August and September 1989 in the Northern Province of Sudan coinciding with a high population density of phlebotomine sandflies. An investigation was conducted to determine whether arboviruses were associated with human illness during this outbreak. Sera were obtained from 185 febrile individuals and tested for IgG and IgM antibody to selected arboviruses by enzyme immunoassay (EIA). The prevalence of IgG antibody was 59% for West Nile (WN), 53% for Sandfly Fever Sicilian (SFS), 32% for Sandfly Fever Naples (SFN), 39% for Yellow Fever (YF), 24% for dengue-2 (DEN-2), 23% for Rift Valley Fever (RVF), 12% for Chikungunya (CHIK) and 5% for Crimean-Congo haemorrhagic Fever (CCHF) viruses. Antibody prevalences tended to increase with age for WN and YF viruses. Antibody rates were about the same for males and females for most of the viruses tested. The prevalence of IgM antibody to SFN was 24% and reciprocal IgM titre exceeded 12 800 for some individuals suggesting that this virus was the cause of recent infection. The prevalence of IgM antibody for the other viruses did not exceed 5%. The study indicated that several arboviruses were endemic and some of them may have caused human disease in the Northern Province of Sudan. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. MINIST HLTH SUDAN,NATL HLTH LABS,KHARTOUM,SUDAN. CTR DIS CONTROL,ATLANTA,GA 30333. NR 9 TC 29 Z9 32 U1 1 U2 2 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-5304 J9 J TROP MED HYG JI J. Trop. Med. Hyg. PD AUG PY 1994 VL 97 IS 4 BP 228 EP 230 PG 3 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA PA748 UT WOS:A1994PA74800007 PM 8064945 ER PT J AU MATTHEWS, RD CHRISTENSEN, JP CANNING, DA AF MATTHEWS, RD CHRISTENSEN, JP CANNING, DA TI PERSISTENCE OF AUTOLOGOUS FREE FAT TRANSPLANT IN BLADDER SUBMUCOSA OF RATS SO JOURNAL OF UROLOGY LA English DT Article; Proceedings Paper CT Annual Meeting of the Section on Urology of the American-Academy-of-Pediatrics CY OCT 30-NOV 01, 1993 CL WASHINGTON, DC SP AMER ACAD PEDIAT DE BLADDER; VESICOURETERAL REFLUX; RATS ID INJECTION; REFLUX; TEFLON AB The endoscopic correction of vesicoureteral reflux is a well accepted procedure. However, the search for the ideal injectable substance continues. We compared the persistence of autologous free fat transplants from the perivesical fat pad and the abdominal wall to the bladder submucosa in an animal model. Perivesical fat consistently showed greater persistence than abdominal wall fat over time. Perivesical fat may be an ideal substance for endoscopic injection when treating vesicoureteral reflux. C1 USN,MED CTR,DEPT UROL,SAN DIEGO,CA. RP MATTHEWS, RD (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 9 TC 12 Z9 13 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD AUG PY 1994 VL 152 IS 2 BP 819 EP 821 PN 2 PG 3 WC Urology & Nephrology SC Urology & Nephrology GA NW330 UT WOS:A1994NW33000067 PM 8022023 ER PT J AU ABBOTT, NL ROLISON, DR WHITESIDES, GM AF ABBOTT, NL ROLISON, DR WHITESIDES, GM TI COMBINING MICROMACHINING AND MOLECULAR SELF-ASSEMBLY TO FABRICATE MICROELECTRODES SO LANGMUIR LA English DT Article ID OMEGA-HYDROXY THIOL; SCANNING TUNNELING MICROSCOPE; ORGANIC MONOLAYERS; COATED ELECTRODES; GOLD ELECTRODES; REDOX COUPLES; SURFACES; ELECTROCHEMISTRY; KINETICS; ULTRAMICROELECTRODES AB This paper describes three types of gold electrodes, each with at least one spatial dimension as small as 1 mum, fabricated using combinations of micromachining and molecular self-assembly. (i) Large-area (>0.1 MM2) arrays of band-type electrodes were formed by machining micrometer-wide grooves of bare gold into gold film covered with a approximately 23-angstrom-thick, electrically insulating, self-assembled monolayer (SAM) of CH3(CH2)15S. (ii) Micrometer-wide, centimeter-long, 100-nm-thick gold electrodes supported on glass were fabricated by patterning a gold film with monolayers of CH3(CH2)15S and HO(CH2)2S, and selectively etching the regions of gold covered with HO(CH2)2S using an aqueous solution of CN- saturated with 02. (iii) Two microelectrodes, each with electrochemically active areas as small as 100 nm x 1 mum and separated from each other by a distance of lum, were formed by machining a 1-mum-wide gap into a supported gold wire covered with an electrically insulating SAM of CH3(CH2)15S; exposed gold on either side of the machined gap formed the electrochemically active surfaces of the microelectrode pair. C1 USN, RES LAB, SURFACE CHEM BRANCH, WASHINGTON, DC 20375 USA. HARVARD UNIV, DEPT CHEM, CAMBRIDGE, MA 02138 USA. RP ABBOTT, NL (reprint author), UNIV CALIF DAVIS, DEPT CHEM ENGN & MAT SCI, DAVIS, CA 95616 USA. NR 59 TC 60 Z9 60 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD AUG PY 1994 VL 10 IS 8 BP 2672 EP 2682 DI 10.1021/la00020a028 PG 11 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA PC650 UT WOS:A1994PC65000028 ER PT J AU KIM, OK CHOI, LS AF KIM, OK CHOI, LS TI SUPRAMOLECULAR INCLUSION COMPLEXATION OF AMYLOSE WITH PHOTOREACTIVE DYES SO LANGMUIR LA English DT Article ID LANGMUIR-BLODGETT MULTILAYERS; FLUORESCENCE ENHANCEMENT; CONFORMATION; CYCLODEXTRIN; GENERATION; BINDING; PROBE AB A series of 4-[4-(dimethylamino)styryl]-1-alkylpyridinium bromide (DASP-C(n)) dyes were synthesized for inclusion studies with amylose. Inclusion complexability of DASP dyes with amylose, and conformational transitions of amylose upon complexation with the dyes were investigated using UV-visible, fluorescence, and circular dichroism (CD) spectra in various dimethyl sulfoxide (DMSO)-H2O mixtures. Complete amylose inclusion occurs with DASP dyes > C-12 while it decreases sharply with the dyes less-than-or-equal-to C-12. Amylose inclusion is sensitive to the solvent composition, showing a clear transition at a DMSO fraction, PHI(DMSO) = 0.6, above which no or negligible complexation occurs. Amylose resumes the helical conformation upon complexation (at PHI(DMSO) less-than-or-equal-to 0.6) with DASP dyes but the helical state is affected by the solvent polarity, becoming loosened with decreasing DMSO content. RP KIM, OK (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 39 TC 41 Z9 41 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD AUG PY 1994 VL 10 IS 8 BP 2842 EP 2846 DI 10.1021/la00020a055 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA PC650 UT WOS:A1994PC65000055 ER PT J AU HUNSAKER, DH AF HUNSAKER, DH TI ANESTHESIA FOR MICROLARYNGEAL SURGERY - THE CASE FOR SUBGLOTTIC JET VENTILATION SO LARYNGOSCOPE LA English DT Article ID HIGH-FREQUENCY VENTILATION; POSITIVE-PRESSURE VENTILATION; LASER LARYNGEAL SURGERY; ENDOTRACHEAL-TUBE; INTRAVENOUS ANESTHESIA; MECHANICAL VENTILATION; AIRWAY-OBSTRUCTION; APNEIC ANESTHESIA; LARYNGOSCOPY; METAL AB Although the techniques for surgery on the endolarynx using suspension and the operating microscope have been fully developed,(1-4) the safest, and least obtrusive anesthetic technique has yet to be manifested, as evidenced by more than 200 references to anesthesia for microlaryngoscopy in the world literature. This study reviews the physiology, physics, and problems of each anesthetic technique. In light of this review, animal and human studies are reported demonstrating the utility and safety of subglottic ventilation when provided with proper monitoring using an automatic ventilator. A modified Pen-Jet tube is reported,(5) which has a 1-mm ID channel to monitor Pco(2) and tracheal pressure. This self-centering 3.0-mm tube, which extends 6 to 8 cm below the glottis, is unobtrusive for the surgeon. The subglottic tube, which is much less likely to be malaligned, is much more acceptable to the anesthesiologist. Anesthesia, by intravenous sedation, utilizes neuromuscular blockade while ventilating through the jet tube powered by an automatic ventilator with an automatic shutdown feature attached to the monitor tube to prevent inadvertent barotrauma. The third phase of this study compared fluoroplastic, used in a prototype jet ventilation tube, with 6-mm Silastic(R), Red Rubber, and polyvinyl chloride (PVC) tubes when struck by maximum power of CO2, Nd-YAG, and K-532 lasers. The test was performed in a closed chamber in which concentrations of oxygen and nitrogen were controlled. Although damaged by the CO2 laser beam, the fluoroplastic tubes did not continue burning when the laser was turned off in 100% oxygen, even when coated by blood. The other three tubes continued to burn in 23% oxygen. Neither the RTP nor Nd-YAG laser damaged the Teflon tube, while they ignited a sustained flame in 30% oxygen. This study supports the use of fluoroplastic for a laser safe jet ventilation tube. It also demonstrates the danger of tube fires, even in low oxygen concentrations, when using Silastic, rubber, and PVC tubes in laser laryngeal surgery. There was no difference in the flammability of Silastic, rubber or PVC when struck by these lasers in this study. For these reasons, subglottic ventilation using a fluoroplastic, monitored, self-centering, subglottic, jet ventilation tube driven by an automatic ventilator with a shutdown feature, in the event of excessive pressure buildup, is proposed for anesthetizing healthy patients undergoing suspension microlaryngoscopy, and who have no airway obstructing lesion. A large tube with inflatable cuff is indicated when a supraglottic lesion may obstruct the airway. C1 USN,MED CTR,DEPT OTOLARYNGOL,SAN DIEGO,CA 92134. RP HUNSAKER, DH (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 129 TC 57 Z9 59 U1 0 U2 2 PU LARYNGOSCOPE CO PI ST LOUIS PA 10 S BROADWAY 14TH FLOOR, ST LOUIS, MO 63102-1741 SN 0023-852X J9 LARYNGOSCOPE JI Laryngoscope PD AUG PY 1994 VL 104 IS 8 SU 65 BP 1 EP 30 PN 2 PG 30 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA PC231 UT WOS:A1994PC23100001 PM 8052087 ER PT J AU ALEGRIA, A COLMENERO, J NGAI, KL ROLAND, CM AF ALEGRIA, A COLMENERO, J NGAI, KL ROLAND, CM TI OBSERVATION OF THE COMPONENT DYNAMICS IN A MISCIBLE POLYMER BLEND BY DIELECTRIC AND MECHANICAL SPECTROSCOPIES SO MACROMOLECULES LA English DT Article ID SEGMENTAL RELAXATION; VISCOELASTIC PROPERTIES; AMORPHOUS POLYMERS; POLYISOPRENE; POLYSTYRENE; POLY(ALPHA-METHYLSTYRENE); MISCIBILITY; REGION; TIME AB Dielectric and mechanical relaxation measurements of the local segmental relaxation in miscible blends of poly(vinylethylene) (PVE) and polyisoprene (PIP) have been made under isothermal conditions over a wide range of frequency. Taking advantage of the prominence of respectively the PVE contribution to dielectric relaxation and the PIP contribution to mechanical relaxation, we are able to resolve the dynamics of each component in some of the blends. From the observed dynamics of individual components, we establish as experimental facts that the most probable local segmental relaxation time of each component has a different magnitude as well as different temperature dependence. Moreover, the relaxation spectrum of each component broadens as temperature is decreased. Thus a breakdown of thermorheological simplicity occurs not only in the dynamics of each component but a fortiori when the contributions from both components are considered together. The degree to which these effects manifest themselves depends on the blend composition. All these experimental features are shown to be in accord with a theory of segmental dynamics for blends that is obtained as a generalization of the coupling model for homopolymers by taking into account local concentration fluctuations. C1 USN,RES LAB,WASHINGTON,DC 20375. UPV,EHU,FAC QUIM,DEPT FIS MAT,E-20080 SAN SEBASTIAN,SPAIN. RI Colmenero, Juan/G-8725-2015; ALEGRIA, ANGEL/H-1035-2015 OI Colmenero, Juan/0000-0002-2440-4953; ALEGRIA, ANGEL/0000-0001-6125-8214 NR 28 TC 167 Z9 167 U1 3 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 1 PY 1994 VL 27 IS 16 BP 4486 EP 4492 DI 10.1021/ma00094a009 PG 7 WC Polymer Science SC Polymer Science GA PC274 UT WOS:A1994PC27400009 ER PT J AU NGAI, KL RIZOS, AK AF NGAI, KL RIZOS, AK TI A CONNECTION BETWEEN THE MODIFICATION OF SOLVENT DYNAMICS BY POLYMER IN POLYMER-SOLUTIONS AND COMPONENT DYNAMICS IN MISCIBLE POLYMER BLENDS SO MACROMOLECULES LA English DT Article ID AROCLOR SOLUTIONS; SEGMENTAL RELAXATION; POLYSTYRENE AROCLOR; FRICTION; POLYBUTADIENE; POLYISOPRENE; SCATTERING; VISCOSITY; MOLECULES; MOBILITY AB In polymer solutions it has been established both theoretically and experimentally that the relative time scales for polymer and solvent motions are intimately related to the modification of solvent dynamics upon the addition of polymers. Using experimental data of miscible poly(vinylethylene)/polyisoprene blends, we show that a similar relation also holds in polymer blends. That is, the relative time scales for guest polymer and pure host polymer local motions are closely related to the modification of the host polymer dynamics by the presence of guest polymer. Dynamics in blends rich in polyisoprene resemble the behavior seen in Aroclor solutions of polystyrene. On the other hand, dynamics in blends rich in poly(vinylethylene) bear a strong resemblance to properties of Aroclor solutions of 1,4-polybutadiene or polyisoprene. As Gisser and Ediger have shown in Aroclor solutions of different polymers, one value of an adjustable scaling factor sufficed to bring together the rate at which the addition of guest polymer alters the relaxation time of the host polymer and the relative segmental relaxation times of guest and host polymers for both poly(vinylethylene)-rich and polyisoprene-rich blends. The value of the scaling factor for polymer blends is about a factor of 2 smaller than that found by Gisser and Ediger in Aroclor solutions of polymers. C1 UNIV CRETE,GR-7110 IRAKLION,GREECE. RES CTR CRETE,DEPT CHEM,GR-7110 IRAKLION,GREECE. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Rizos, Apostolos/F-6807-2011 NR 27 TC 13 Z9 13 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 1 PY 1994 VL 27 IS 16 BP 4493 EP 4497 DI 10.1021/ma00094a010 PG 5 WC Polymer Science SC Polymer Science GA PC274 UT WOS:A1994PC27400010 ER PT J AU CHERKIS, NZP STEINMETZ, S SCHREIBER, R THIEDE, J THEINER, J AF CHERKIS, NZP STEINMETZ, S SCHREIBER, R THIEDE, J THEINER, J TI VESTERIS SEAMOUNT - AN ENIGMA IN THE GREENLAND BASIN SO MARINE GEOPHYSICAL RESEARCHES LA English DT Article DE ARCTIC; BATHYMETRY; GREENLAND SEA; SEAMOUNTS; VOLCANISM ID PATTERNS; PLUMES; FLOW; SEA AB Vesteris Seamount is a solitary submarine volcano located at 73-degrees-30' N, 9-degrees-10' W in the Greenland Basin. Steeply rising from a base depth of 3100 m to a minimum depth of approximately 130 m and striking 030-degrees/210-degrees, the feature lies approximately 300 km east of the east Greenland margin on an otherwise nearly flat and featureless seafloor. The main body of the seamount appears to have been formed episodically, the last of which culminated about 110 000 years ago. Subsequent, lower intensity volcanic activity continued sporadically until about 25 000 years ago, as evidenced by ash layers found in cores near the base of the feature. The smoothed surfaces at the summit make it likely that the seamount actually broached the surface during the Weichselian glacial period, between 8000 and 13 000 years ago. Two multibeam bathymetric investigations aboard PFS Polarstern during ARKTIS II/4 (1984) and ARKTIS VII/1 (1990), combined with geologic sampling. single-channel seismic profiling and underwater television coverage, have resulted in a new interpretation of both the morphology and origins of the seamount. Data collected aboard Polarstern from ARKTIS II/4 (1984) have been previously reported by Hempel et al. (1991), however, when combined with the ARKTIS VII/1 (1990) data set, a more detailed interpretation of the morphology and structure was feasible. This included the elongated shape of the feature and showed the existence of several small volcanic cones on the seamount flanks. C1 ALFRED WEGENER INST POLAR & MARINE RES,W-2850 BREMERHAVEN,GERMANY. ATLAS ELEKTR GMBH,D-28000 BRMEEN 44,GERMANY. FORSCHUNGSZENTRUM MARINE GEOWISSENSCH,GEOMAR,W-2300 KIEL,GERMANY. ALFRED WEGENER INST POLAR & MARINE RES,W-2850 BREMERHAVEN,GERMANY. RP CHERKIS, NZP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Thiede, Jorn/J-5313-2013 OI Thiede, Jorn/0000-0002-3452-2208 NR 23 TC 4 Z9 4 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0025-3235 J9 MAR GEOPHYS RES JI Mar. Geophys. Res. PD AUG PY 1994 VL 16 IS 4 BP 287 EP 301 DI 10.1007/BF01224746 PG 15 WC Geochemistry & Geophysics; Oceanography SC Geochemistry & Geophysics; Oceanography GA NZ903 UT WOS:A1994NZ90300002 ER PT J AU TERRELL, JB HARVEY, DP SUDARSHAN, TS LOUTHAN, MR AF TERRELL, JB HARVEY, DP SUDARSHAN, TS LOUTHAN, MR TI PARTICIPATION OF HYDROGEN IN SLOW BENDING BEHAVIOR OF 304L STAINLESS-STEEL SO MATERIALS SCIENCE AND TECHNOLOGY LA English DT Article ID EMBRITTLEMENT; CRACKING AB Three point bending test studies on 304L austenitic stainless steel at 293 and 77 K demonstrated that hydrogen charging promoted the formation of brittle fracture features at 293 K; promoted the formation of larger and shallower microvoids at 77 K; and reduced the energy absorbed by the material at both temperatures, although to a greater degree at 77 K. These observations suggest that although hydrogen redistribution during testing can affect the failure mode of this material, it is not a necessary requirement for hydrogen induced degradation. Furthermore, the observation that embrittlement is more severe at liquid nitrogen temperatures indicates that the effects of low temperatures and hydrogen may interact synergistically. The data presented in this paper are consistent with a model in which the embrittlement process is affected by local hydrogen concentrations. C1 USN,RES LAB,MECH & MAT BRANCH,WASHINGTON,DC 20375. MAT MODIFICAT INC,FAIRFAX,VA. E I DUPONT NEMOURS INC,SAVANNAH RIVER LAB,AIKEN,SC. RP TERRELL, JB (reprint author), REYNOLDS MET CO,RICHMOND,VA, USA. NR 22 TC 0 Z9 0 U1 0 U2 1 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5DB SN 0267-0836 J9 MATER SCI TECH SER JI Mater. Sci. Technol. PD AUG PY 1994 VL 10 IS 8 BP 738 EP 740 PG 3 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PR617 UT WOS:A1994PR61700010 ER PT J AU DUTTA, I HARPER, CP DUTTA, G AF DUTTA, I HARPER, CP DUTTA, G TI ROLE OF AL2O3 PARTICULATE REINFORCEMENTS ON PRECIPITATION IN 2014 AL-MATRIX COMPOSITES SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID AGING BEHAVIOR; ALLOY; FIBER AB Precipitation in commercial aluminum alloy 2014, without and with alumina particulate reinforcements, was studied using microhardness, electrical resistivity, differential scanning calorimetry (DSC), and transmission electron microscopy. The precipitation sequence in 2014 Al was confirmed to be alpha(ss) --> alpha + GPZ --> alpha + lambda' --> alpha + lambda' + theta' --> alpha + lambda (AlCuMgSi) + theta (CuAl2). Reinforcement addition decreased the time to peak hardness, but also reduced the peak matrix microhardness. This was traced to a decrease in the amount of lambda' formed in the composites. Further, it was observed that while Guinier-Preston (GP) zone and theta' formations are accelerated in the composites, lambda' precipitation is decelerated. The acceleration is attributable primarily to enhanced nucleation resulting from an increase in the matrix dislocation density due to coefficient of thermal expansion (CTE) mismatch between the matrix and the reinforcements, whereas the deceleration is associated with a decrease of low-temperature solute diffusivity due to absorption of vacancies at dislocations and interfaces. It was also observed that the degree of overall acceleration in hardening and the reduction in peak matrix microhardness with reinforcement addition decreased with decreasing aging temperatures. The causal relationships of these observations with the associated mechanisms are discussed. RP DUTTA, I (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 27 TC 55 Z9 55 U1 0 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD AUG PY 1994 VL 25 IS 8 BP 1591 EP 1602 DI 10.1007/BF02668525 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NY717 UT WOS:A1994NY71700004 ER PT J AU KANDRA, JT LEE, EW AF KANDRA, JT LEE, EW TI TEMPERATURE AND MICROSTRUCTURAL DEPENDENCE OF THE DEFORMATION OF A HIGH NB TI-AL ALLOY SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID GAMMA-TITANIUM ALUMINIDE; INTERMETALLIC COMPOUND; YIELD STRESS; DISLOCATION TRANSFORMATION; MECHANICAL-PROPERTIES; SINGLE-CRYSTALS; BASE ALLOYS; ANOMALIES; DISSOCIATION; TRANSITION AB Compression testing of a Ti-44Al-11 Nb alloy was carried out at various temperatures and for different microstructures. Annealing was done at temperatures from 1000-degrees-C, to 1500-degrees-C to produce the unrecrystallized, duplex (gamma grains plus lamellar colonies) and the fully lamellar microstructures. Samples of each of these microstructures were then tested in air at room temperature and at various temperatures from 1000-degrees-C to 1300-degrees-C. Results indicate that successively higher temperature anneals produce increasing grain or colony sizes from 138 mum in the unrecrystallized microstructure to 1017 mum in the fully lamellar microstructure. A sequentially lower yield stress was produced on samples tested at increasingly higher temperatures for a given microstructure. In addition, a minimum yield stress on each yield stress vs temperature curve was recorded for the duplex microstructure with a colony size of 154 mum. One promising result was a sample of this microstructure tested at room temperature, where a yield stress of better than 800 MPa and a compressive strain at the cessation of testing of better than 14 pct were obtained. RP KANDRA, JT (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,WARMINSTER,PA 18974, USA. NR 41 TC 11 Z9 11 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD AUG PY 1994 VL 25 IS 8 BP 1667 EP 1679 DI 10.1007/BF02668532 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NY717 UT WOS:A1994NY71700011 ER PT J AU JAGANATHAN, J AGGARWAL, I AF JAGANATHAN, J AGGARWAL, I TI SEPARATION OF IRON, COBALT, NICKEL, AND COPPER FROM ALUMINUM FLUORIDE AND THEIR DETERMINATION BY GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRY SO MICROCHEMICAL JOURNAL LA English DT Article ID OPTICAL FIBERS; GLASSES; METAL AB An analytical method for the determination of iron, cobalt, nickel, and copper in aluminum fluoride has been described. The insolubility of AlF3 in inorganic acids makes it necessary to separate these metals by leaching them with HNO3. The metals that leached out were quantitated with graphite furnace atomic absorption spectrometry. The results were compared with those obtained from spark source mass spectrometry and were found to agree within 10% error. The methodological detection limits which are based on the entire analytical protocol, for Fe, Co, Ni, and Cu were 3, 1, 2, and 2 ppb, respectively. The proposed method has been shown to separate quantitatively the elements desired from the complex matrix of AlF3, thus eliminating the tedious and time-consuming solvent extraction methods. (C) 1994 Academic Press, Inc. C1 VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP JAGANATHAN, J (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5605,WASHINGTON,DC 20375, USA. NR 7 TC 1 Z9 1 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0026-265X J9 MICROCHEM J JI Microchem J. PD AUG PY 1994 VL 50 IS 1 BP 44 EP 47 DI 10.1006/mchj.1994.1056 PG 4 WC Chemistry, Analytical SC Chemistry GA PA366 UT WOS:A1994PA36600007 ER PT J AU KOEHLER, RH SMITH, RS BACANER, T AF KOEHLER, RH SMITH, RS BACANER, T TI TRIAGE OF AMERICAN COMBAT CASUALTIES - THE NEED FOR CHANGE SO MILITARY MEDICINE LA English DT Article AB United States military medical planning must reevaluate the practices of combat casualty resuscitation, transportation, and triage to secondary echelon care. Analysis of the experiences of other medical commands, such as that of the Israeli Defense Force, offers insight into improvements in equipment and training that are achievable with minimal cost. Training programs must involve formal instruction in Advanced Trauma Life Support for the combat corpsman, and ongoing experience in trauma surgery for personnel who are placed in the role of military surgeons. Today in military medicine there exists a major deficiency of expertise in trauma care, arising through a near total lack of involvement in active trauma surgery on the part of military medical training facilities. Civilian trauma centers offer an abundance of opportunity for military-like casualty management, and successful efforts at our command have integrated active duty personnel into this experience. RP KOEHLER, RH (reprint author), USN HOSP,DEPT SURG,DIV TRAUMA SURG,OAKLAND,CA, USA. NR 0 TC 11 Z9 11 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD AUG PY 1994 VL 159 IS 8 BP 541 EP 547 PG 7 WC Medicine, General & Internal SC General & Internal Medicine GA PP246 UT WOS:A1994PP24600001 PM 7824145 ER PT J AU SAGAR, V JACYNA, GM SZU, H AF SAGAR, V JACYNA, GM SZU, H TI BLOCK-PARALLEL DECODING OF CONVOLUTIONAL-CODES USING NEURAL-NETWORK DECODERS SO NEUROCOMPUTING LA English DT Article DE BLOCK CODES, CONVOLUTIONAL CODES; CONSTRAINT LENGTH; ENCODER MEMORY; FREE DISTANCE; HAMMING NEURAL NETWORK; MAXIMUM LIKELIHOOD DECODING; MARKOV PROCESS; STATE DIAGRAM; TRELLIS GRAPH; WINNER-TAKE-ALL CIRCUIT AB An off-line trained and supervised neural network is proposed to decode convolutional codes one block at a time. A convolutional encoder is a linear finite-state machine and Viterbi decoder performs maximum likelihood decoding. In the neural network model a set of neurons equal to the number of encoder states forms an input stage, and a block of B stages are linked together with fully forward and backward links among adjacent stages, which span m - 1 stages on both sides, where m is the convolutional encoder memory. A Hamming neural network is used together with a winner-take-all circuit at each stage to select the decoded sequence. The performance is calibrated against noisy channel corrupted encoder inputs (constraint length K = 3, and m = 2) to be similar to the maximum likelihood Viterbi decoder. C1 CATHOLIC UNIV AMER,DEPT ELECT ENGN,HYATTSVILLE,MD 20783. CATHOLIC UNIV AMER,DEPT ELECT ENGN,RESTON,VA 22091. NSWC,SILVER SPRING,MD 20903. UNIV MARYLAND,UNIV COLL,COLLEGE PK,MD 20742. AMERICAN UNIV,DEPT COMP SCI & INFORMAT SCI,WASHINGTON,DC 20016. GEORGE WASHINGTON UNIV,DEPT ECS,WASHINGTON,DC 20052. NR 9 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-2312 J9 NEUROCOMPUTING JI Neurocomputing PD AUG PY 1994 VL 6 IS 4 BP 455 EP 471 DI 10.1016/0925-2312(94)90022-1 PG 17 WC Computer Science, Artificial Intelligence SC Computer Science GA PE460 UT WOS:A1994PE46000005 ER PT J AU SHLESINGER, MF KLAFTER, J ZUMOFEN, G AF SHLESINGER, MF KLAFTER, J ZUMOFEN, G TI FRACTAL TIME AND SPACE IN COMPLEX FLUIDS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS LA English DT Article; Proceedings Paper CT I International Conference on Scaling Concepts and Complex Fluids CY JUL 04-08, 1994 CL COPANELLO, ITALY ID RANDOM-WALKS; DIFFUSION AB We investigate transport in complex fluids including glassy materials and turbulent flows. We focus on regimes where fractal hierarchical scaling exists in time, space or both simultaneously. C1 TEL AVIV UNIV,SCH CHEM,RAMAT AVIV,ISRAEL. ETH ZURICH,PHYS CHEM LAB,CH-8092 ZURICH,SWITZERLAND. RP SHLESINGER, MF (reprint author), USN,RES OFF,DIV CHEM & PHYS S&T,ARLINGTON,VA 22217, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 0392-6737 J9 NUOVO CIMENTO D JI Nuovo Cimento Soc. Ital. Fis. D-Condens. Matter At. Mol. Chem. Phys. Fluids Plasmas Biophys. PD AUG PY 1994 VL 16 IS 8 BP 1119 EP 1125 DI 10.1007/BF02458792 PG 7 WC Physics, Multidisciplinary SC Physics GA RE317 UT WOS:A1994RE31700013 ER PT J AU PACE, PE STYER, D AF PACE, PE STYER, D TI HIGH-RESOLUTION ENCODING PROCESS FOR AN INTEGRATED OPTICAL ANALOG-TO-DIGITAL CONVERTER SO OPTICAL ENGINEERING LA English DT Article DE INTEGRATED OPTICS; ANALOG-TO-DIGITAL CONVERTERS; HIGH RESOLUTION; SYMMETRICAL NUMBER SYSTEMS AB A technique is described for extending the resolution of an integrated optical multi-interferometer guided-wave analog-to-digital converter. The optical output waveform for each interferometer is symmetrically folded at twice a proper modulus. A small comparator ladder mid-level quantizes each interferometer's detected output to encode the analog signal in a symmetrical number system (SNS) format. By incorporating the SNS encoding, resolution greater than 1 bit per interferometer can be provided. Analog signal levels that can cause possible encoding errors are examined and their impact on the overall amplitude analyzing function is discussed. The maximum laser pulse width and maximum fluctuation in the sampling interval that can be tolerated is also discussed. Results indicate that 11-bit resolution can be provided with three interferometers and 39 comparators. C1 UNIV CINCINNATI,DEPT MATH SCI,CINCINNATI,OH 45221. RP PACE, PE (reprint author), USN,POSTGRAD,DEPT ELECT & COMP ENGN,CODE EC-PC,MONTEREY,CA 93943, USA. NR 9 TC 38 Z9 40 U1 2 U2 3 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1994 VL 33 IS 8 BP 2638 EP 2645 DI 10.1117/12.173559 PG 8 WC Optics SC Optics GA PB299 UT WOS:A1994PB29900020 ER PT J AU BAIRD, JK AF BAIRD, JK TI AGE AND STRAIN-TRANSCENDING IMMUNITY TO PLASMODIUM-FALCIPARUM SO PARASITOLOGY TODAY LA English DT Letter RP BAIRD, JK (reprint author), USN,MED RES UNIT 2,DEPT PARASITOL,JAKARTA BOX 3,AMER EMBASSY,APO,AP 96520, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0169-4758 J9 PARASITOL TODAY JI Parasitol. Today PD AUG PY 1994 VL 10 IS 8 BP 302 EP 302 PG 1 WC Parasitology SC Parasitology GA NY261 UT WOS:A1994NY26100006 PM 15275424 ER PT J AU BUDHANI, RC WEAVER, BD HOLSTEIN, WL AF BUDHANI, RC WEAVER, BD HOLSTEIN, WL TI DISORDER-INDUCED REDUCTION OF THE ANOMALOUS HALL VOLTAGE IN PROTON-IRRADIATED AND AG21+-ION-IRRADIATED TL2BA2CACU2O8 EPITAXIAL-FILMS SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTORS; SINGLE-CRYSTALS; VORTEX MOTION; SIGN REVERSAL; YBA2CU3O7-DELTA; RESISTANCE; BEHAVIOR; DENSITY; TC AB The effects of structural disorder introduced by proton and heavy-ion irradiation on the mixed-state Hall resistivity (rho(xy)) of Tl2Ba2CaCu2O8 films are reported. The rho(xy) attains a peak negative value at a temperature T* where the vortex mobility is a rapidly varying function of temperature. At T* it also shows a universal inverse scaling with the normal-state resistivity of the material, which increases on irradiation. Our data suggest that a stronger downstream contribution to vortex velocity from the drift of the normal carriers in the core, dictates the sign of the Hall voltage as the overall carrier concentration in the materials is reduced by irradiation. C1 BROOKHAVEN NATL LAB, DIV MAT SCI, UPTON, NY 11973 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. DUPONT CO INC, CENT RES & DEV, WILMINGTON, DE 19880 USA. NR 26 TC 4 Z9 4 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1994 VL 50 IS 5 BP 3499 EP 3502 DI 10.1103/PhysRevB.50.3499 PG 4 WC Physics, Condensed Matter SC Physics GA PB182 UT WOS:A1994PB18200110 ER PT J AU WANG, YN GU, M SUN, LH NGAI, KL AF WANG, YN GU, M SUN, LH NGAI, KL TI MECHANISM OF SNOEK-KOSTER RELAXATION IN BODY-CENTERED-CUBIC METALS SO PHYSICAL REVIEW B LA English DT Article ID NA BETA-ALUMINA; CONDUCTIVITY-RELAXATION; GLASSES; OXYGEN; CONDUCTORS; CROSSOVER; TANTALUM; NIOBIUM; DEBYE AB The importance of the effects of mutual interactions between the interstitial solute atoms in the Cottrell atmosphere on the Snoek-Koster relaxation in cold-worked bcc metals is emphasized in a theoretical approach based on the coupling model. It is shown that the large activation enthalpy of the relaxation time and the breadth of the internal-friction peak associated with the Snoek-Koster relaxation can be explained quantitatively by this model for various foreign atoms in several bcc metals. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP NANJING UNIV, SOLID STATES MICROSTRUCT LAB, NANJING, PEOPLES R CHINA. NR 45 TC 33 Z9 42 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1994 VL 50 IS 6 BP 3525 EP 3531 DI 10.1103/PhysRevB.50.3525 PG 7 WC Physics, Condensed Matter SC Physics GA PB629 UT WOS:A1994PB62900001 ER PT J AU RUBINSTEIN, M AF RUBINSTEIN, M TI CLASSICAL-THEORY OF GIANT MAGNETORESISTANCE IN GRANULAR METALS SO PHYSICAL REVIEW B LA English DT Article ID CONDUCTIVITY AB I have extended the one-dimensional spin-diffusion theory of Valet and Fert [Phys. Rev. B 48, 7099 (1993)] [which treats perpendicular giant magnetoresistance (GMR) in magnetic multilayers] to three dimensions in order to deal with the problem of GMR in granular magnetic metals. These materials are composed of tiny precipitates of magnetic granules suspended within an immiscible nonmagnetic metallic matrix. It is assumed that the granules are spherical in shape, and have identical radii. The differential equations are solved separately for three different physical, situations: (1) Bulk spin-dependent scattering in the nonmagnetic matrix; (2) Bulk spin-dependent scattering within the magnetic spheres; and (3) surface spin-dependent scattering at the ferromagnetic-normal interface. The magnetically induced electrical interaction between spheres, which gives rise to observed GMR, is treated in lowest order only. It is found to act via an induced electric-dipole field for cases (1) and (3), and an induced spin-diffusion field for case (2). Using these solutions, and macroscopic parameters from experiment, I have attempted to explain the observed singular dependence of the GMR on annealing temperature. RP RUBINSTEIN, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 59 Z9 60 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1994 VL 50 IS 6 BP 3830 EP 3838 DI 10.1103/PhysRevB.50.3830 PG 9 WC Physics, Condensed Matter SC Physics GA PB629 UT WOS:A1994PB62900035 ER PT J AU SINGH, DJ AF SINGH, DJ TI ELECTRONIC-STRUCTURE OF PRBA2CU3O7 SO PHYSICAL REVIEW B LA English DT Article ID NORMAL STATE PROPERTIES; BRILLOUIN-ZONE; FERMI-SURFACE; SUPERCONDUCTIVITY; Y1-XPRXBA2CU3O7-DELTA; YBA2CU3O7-DELTA; APPROXIMATION; SUPPRESSION; PR AB Electronic-structure calculations, within the local spin density approximation (LSDA), are reported for PrBa2Cu3O7. Significant charge transfer from the Pr ions to both the CuO2 planes and the chains is found relative to YBa2Cu3O7. This supports hole depletion explanations for the insulating character of PrBa2Cu3O7. The LSDA electronic structure shows a prominent ''ridge'' Fermi surface analogous to that in YBa2Cu3O7, but broader. It is proposed that high-resolution positron measurements of this width may provide a useful test of hole depletion models. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 31 TC 28 Z9 28 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1994 VL 50 IS 6 BP 4106 EP 4111 DI 10.1103/PhysRevB.50.4106 PG 6 WC Physics, Condensed Matter SC Physics GA PB629 UT WOS:A1994PB62900067 ER PT J AU RAJAGOPAL, AK BUOT, FA AF RAJAGOPAL, AK BUOT, FA TI QUANTUM DYNAMICS OF MOLECULAR MOTIONS BASED ON A FUNCTIONAL METHOD SO PHYSICAL REVIEW E LA English DT Article AB A time-dependent functional formalism of molecular positions is developed in order to study non-equilibrium problems. It is based on the Liouvillean quantum field dynamics and is different from the density-functional framework. It provides a direct self-consistent approach to molecular dynamics of a system which is initially in thermodynamic equilibrium and is subjected to time-dependent external force. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD AUG PY 1994 VL 50 IS 2 BP 721 EP 726 DI 10.1103/PhysRevE.50.721 PN A PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PD425 UT WOS:A1994PD42500021 ER PT J AU CHOW, AW SINTON, SW IWAMIYA, JH STEPHENS, TS AF CHOW, AW SINTON, SW IWAMIYA, JH STEPHENS, TS TI SHEAR-INDUCED PARTICLE MIGRATION IN COUETTE AND PARALLEL-PLATE VISCOMETERS - NMR IMAGING AND STRESS MEASUREMENTS SO PHYSICS OF FLUIDS LA English DT Article ID CONCENTRATED SUSPENSIONS; FLOW AB Couette and parallel plate viscometers are two commonly used flow geometries to characterize shear viscosity of concentrated suspensions. In Couette flow, it is well documented that prolonged shearing causes a decrease in the apparent viscosity of concentrated suspensions due to shear-induced particle migration from the annulus region to the stagnant region under the bob. In this study, the technique of nuclear magnetic resonance imaging (NMRI) was used to measure the evolution of suspension concentration profiles in Couette and parallel-plate flow devices upon shearing. Neutrally buoyant suspensions of nearly monodisperse, non-Brownian spherical particles at a volume fraction of 0.5 in a Newtonian fluid were used. The same flow cells and suspensions were also used in a rheometer to measure the changes in shear stress under identical experimental conditions such that a direct comparison can be made between the stress and concentration data. For Couette flow, the NMRI data correlated very well with the stress measurements and directly confirmed the Leighton-Acrivos [J. Fluid. Mech. 181, 415 (1987)] shear-induced migration theory. In torsional flow between parallel plates, no detectable change was found in particle concentration in the radial direction, but some decrease in the apparent viscosity was observed. These results provide some important clues for developing and evaluating more general descriptions of particle migration for nonrectilinear shear flows. C1 USN,CTR AIR WARFARE,DIV CHEM,CHINA LAKE,CA 93555. RP CHOW, AW (reprint author), LOCKHEED PALO ALTO RES LABS,3251 HANOVER ST,PALO ALTO,CA 94304, USA. RI Stephens, Thomas/D-9512-2012 NR 21 TC 115 Z9 115 U1 0 U2 15 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD AUG PY 1994 VL 6 IS 8 BP 2561 EP 2576 DI 10.1063/1.868147 PG 16 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NZ154 UT WOS:A1994NZ15400003 ER PT J AU SELTZER, MD GREEN, RB AF SELTZER, MD GREEN, RB TI INSTRUMENTATION FOR CONTINUOUS EMISSIONS MONITORING OF AIRBORNE METALS SO PROCESS CONTROL AND QUALITY LA English DT Article DE ATOMIC EMISSION SPECTROMETRY; AIRBORNE METALS; CONTINUOUS MONITORING; INDUCTIVELY COUPLED PLASMA; REAL-TIME DETECTION ID AIR AB A system for continuous emissions monitoring of airborne metals is reported. The basis of this system is a commercially available inductively coupled plasma spectrometer that operates on air rather than argon. Real-time detection of airborne copper, barium and strontium in the effluent of an incinerator yielded measurements that agreed within a factor of two with airborne metal concentrations obtained by conventional means. Sample introduction and field calibration methods are discussed. RP SELTZER, MD (reprint author), USN,CTR AIR WARFARE,DIV WEAP,DIV CHEM,RES DEPT,CHINA LAKE,CA 93555, USA. NR 9 TC 35 Z9 35 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0924-3089 J9 PROCESS CONTR QUAL JI Process Control Qual. PD AUG PY 1994 VL 6 IS 1 BP 37 EP 46 PG 10 WC Engineering, Chemical; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA PW941 UT WOS:A1994PW94100005 ER PT J AU LUDWIGSEN, KR ALBRIGHT, DG AF LUDWIGSEN, KR ALBRIGHT, DG TI TRAINING PSYCHOLOGISTS FOR HOSPITAL PRACTICE - A PROPOSAL SO PROFESSIONAL PSYCHOLOGY-RESEARCH AND PRACTICE LA English DT Article ID CARE AB Hospital practice has become increasingly important for psychologists over the past decade. However, expanded opportunities for practice require training for competency. The authors propose developing a comprehensive, systematic, and flexible program of training for hospital practice in psychology including graduate course work. supervised practicum experience, and opportunities for retraining. Recommendations for certification in hospital practice, credentialing and privileging. and continuing education are included. C1 NAVAL HOSP,DEPT PSYCHOL,PATUXENT RIVER,MD. NR 38 TC 6 Z9 8 U1 0 U2 1 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0735-7028 J9 PROF PSYCHOL-RES PR JI Prof. Psychol.-Res. Pract. PD AUG PY 1994 VL 25 IS 3 BP 241 EP 246 PG 6 WC Psychology, Multidisciplinary SC Psychology GA PA433 UT WOS:A1994PA43300009 ER PT J AU CLEWELL, HJ LEE, TS CARPENTER, RL AF CLEWELL, HJ LEE, TS CARPENTER, RL TI SENSITIVITY OF PHYSIOLOGICALLY-BASED PHARMACOKINETIC MODELS TO VARIATION IN MODEL PARAMETERS - METHYLENE-CHLORIDE SO RISK ANALYSIS LA English DT Article DE LIVER; LUNG; METHYLENE CHLORIDE; PHYSIOLOGICALLY BASED PHARMACOKINETIC MODELS; PARAMETER SIGNIFICANCE; SENSITIVITY ANALYSIS ID RISK ASSESSMENT AB The parameters in a physiologically based pharmacokinetic (PBPK) model of methylene chloride were varied systematically, and the resulting variation in a number of model outputs was determined as a function of time for mice and humans at several exposure concentrations. The importance of the various parameters in the model was highly dependent on the conditions (concentration, species) for which the simulation was performed and the model output (dose surrogate) being considered. Model structure also had a significant impact on the results. For sensitivity analysis, particular attention must be paid to conservation equations to ensure that the variational calculations do not alter mass balance, introducing extraneous effects into the model. All of the normalized sensitivity coefficients calculated in this study ranged between -1.12 and 1, and most were much less than 1 in absolute value, indicating that individual input errors are not greatly amplified in the outputs. In addition to ranking parameters in terms of their impact on model predictions, time-dependent sensitivity analysis can also be used as an aid in the design of experiments to estimate parameters by predicting the experimental conditions and sampling points which will maximize parameter identifiability. C1 USN,MED RES INST DETACHMENT TOXICOL,2612 5TH ST,WRIGHT PATTERSON AFB,OH 45433. CLEMENT ASSOCIATES,RUSHTON,LA. WESTERN ILLINOIS UNIV,DEPT MATH,MACOMB,IL 61455. NR 11 TC 55 Z9 55 U1 2 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD AUG PY 1994 VL 14 IS 4 BP 521 EP 531 DI 10.1111/j.1539-6924.1994.tb00268.x PG 11 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PK031 UT WOS:A1994PK03100014 PM 7972956 ER PT J AU KANDRA, JT NEU, CE OPET, SL FRAZIER, WE AF KANDRA, JT NEU, CE OPET, SL FRAZIER, WE TI THE INFLUENCE OF THERMOMECHANICAL PROCESSING ON THE HARDNESS AND MICROSTRUCTURE OF BETA-C TITANIUM SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP KANDRA, JT (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,WARMINSTER,PA 18974, USA. NR 8 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD AUG 1 PY 1994 VL 31 IS 3 BP 243 EP 248 DI 10.1016/0956-716X(94)90277-1 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NM940 UT WOS:A1994NM94000003 ER PT J AU MCKENNA, TM CLEGG, JM WILLIAMS, TJ AF MCKENNA, TM CLEGG, JM WILLIAMS, TJ TI PROTEIN-KINASE-C IS A MEDIATOR OF LIPOPOLYSACCHARIDE-INDUCED VASCULAR SUPPRESSION IN THE RAT AORTA SO SHOCK LA English DT Article ID NITRIC-OXIDE SYNTHASE; SMOOTH-MUSCLE CELLS; HUMAN ENDOTHELIAL-CELLS; PHORBOL ESTERS; LIPID-A; ACTIVATION; EXPRESSION; ENDOTOXIN; ASSOCIATION; INHIBITION AB Treatment of vascular tissue with lipopolysaccharide (LPS) in vitro induces hyporesponsiveness to contractile agonists. We investigated whether protein kinase C (PKC) transduces the LPS signal into contractile dysfunction. Rat aortic tissue was incubated .5-18 h with LPS (10 or 30 ng/mL) or alpha- and beta-phorbol 12,13-dibutyrate (PDB,.1 or 1 mu M), either alone or combined with cycloheximide (50 mu M) or the kinase inhibitors sphingosine (20 mu M), H7 (1-(5-isoquinolinylsulfonyl)-2-methyl piperazine, 25 mu M), and HA1004 (N-(2-guanidinoethyl)-5-isoquinolinesulfonamide, 25 mu M). LPS and beta-PDB induced a sustained translocation of PKC activity from the cytosol to the membrane, an increased protein synthesis-dependent expression of nitric oxide synthase (NOS) activity, and an impaired contractility that could be partially reversed by treatment with the NOS inhibitor N omega-nitro-L-arginine methyl ester. Incubation with alpha-PDB, an inactive isomer of beta-PDB, did not alter any of the tissue functions. Sphingosine blocked LPS- and beta-PDB-induced NOS activity and LPS-induced impairments in tissue contractility and PKC translocation. Incubation with H7 also protected against LPS-induced vasoplegia, while HA1004, used as a negative control for H7, provided little protection against LPS. These data indicate that PKC plays a role as an intracellular mediator of LPS-induced NOS activity and vascular suppression. RP MCKENNA, TM (reprint author), USN,MED RES INST,SEPT SHOCK RES PROGRAM,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 32 TC 14 Z9 14 U1 0 U2 0 PU BIOMEDICAL PRESS PI AUGUSTA PA 1021 15TH ST, BIOTECH PARK STE 9, AUGUSTA, GA 30901 SN 1073-2322 J9 SHOCK JI Shock PD AUG PY 1994 VL 2 IS 2 BP 84 EP 89 DI 10.1097/00024382-199408000-00002 PG 6 WC Critical Care Medicine; Hematology; Surgery; Peripheral Vascular Disease SC General & Internal Medicine; Hematology; Surgery; Cardiovascular System & Cardiology GA PF687 UT WOS:A1994PF68700002 PM 7537168 ER PT J AU SCHWARTZ, IB ERNEUX, T AF SCHWARTZ, IB ERNEUX, T TI SUBHARMONIC HYSTERESIS AND PERIOD-DOUBLING BIFURCATIONS FOR A PERIODICALLY DRIVEN LASER SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE PULSATING OSCILLATIONS; POINCARE MAP; BIFURCATION; LASERS; NONLINEAR OPTICS ID INJECTED SIGNAL; ATTRACTORS; INSTABILITIES; MODULATION; HORSESHOE; ORBITS AB The authors consider the laser rate equations for a periodically modulated class B laser. The bifurcation diagram of the periodic solutions is analyzed both numerically and theoretically. The bifurcation parameter is the amplitude of the periodic modulations. Concentration is on the Period I and Period 2 branches of solutions that emerge either from a limit point or from a period doubling bifurcation point. The bifurcation diagrams of the driven laser are analyzed with and without dissipation. It is seen that the laser oscillations become pulsating as their amplitude increases, suggesting a new asymptotic analysis of the laser oscillations. A large parameter proportional to the amplitude of the oscillations is identified and periodic solutions using singular perturbation techniques are constructed. Equations for a Poincare map are derived and an analytical expression of the first period doubling bifurcation is obtained. C1 NORTHWESTERN UNIV,MCCORMINK SCH ENGN,DEPT ENGN SCI & APPL MATH,EVANSTON,IL 60208. RP SCHWARTZ, IB (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPECIAL PROJECT NONLINEAR SCI,CODE 67003,WASHINGTON,DC 20375, USA. RI Schwartz, Ira/A-8073-2009 NR 29 TC 41 Z9 41 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD AUG PY 1994 VL 54 IS 4 BP 1083 EP 1100 DI 10.1137/S0036139992230703 PG 18 WC Mathematics, Applied SC Mathematics GA PA163 UT WOS:A1994PA16300009 ER PT J AU BENZ, AO KOSUGI, T ASCHWANDEN, MJ BANKA, SG CHUPP, EL ENOME, S GARCIA, H HOLMAN, GD KURT, VG SAKAO, T STEPANOV, AV VOLWERK, M AF BENZ, AO KOSUGI, T ASCHWANDEN, MJ BANKA, SG CHUPP, EL ENOME, S GARCIA, H HOLMAN, GD KURT, VG SAKAO, T STEPANOV, AV VOLWERK, M TI PARTICLE-ACCELERATION IN FLARES SO SOLAR PHYSICS LA English DT Article ID HARD X-RAY; THERMAL NONTHERMAL MODEL; SOLAR-FLARES; DYNAMIC SPECTRA; TELESCOPE HXT; RADIO; MICROWAVE; ELECTRON; BURSTS; DIRECTIVITY AB Particle acceleration is intrinsic to the primary energy release in the impulsive phase of solar flares, and we cannot understand flares without understanding acceleration. New observations in soft and hard X-rays, gamma-rays and coherent radio emissions are presented, suggesting flare fragmentation in time and space. X-ray and radio measurements exhibit at least five different time scales in flares. In addition, same new observations of delayed acceleration signatures are also presented. The theory of acceleration by parallel electric fields is used to model the spectral shape and evolution of hard X-rays. The possibility of the appearance of double layers is further investigated. C1 NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. UNIV MARYLAND, DEPT ASTRON, COLLEGE PK, MD 20742 USA. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. UNIV NEW HAMPSHIRE, DEPT PHYS, DURHAM, NH 03824 USA. UNIV NEW HAMPSHIRE, CTR SPACE SCI, DURHAM, NH 03824 USA. NOBEYAMA RADIO OBSERV, NAGANO 381413, JAPAN. NOAA, SPACE ENVIRONM LAB, BOULDER, CO 80303 USA. NASA, GODDARD SPACE FLIGHT CTR, ASTRON & SOLAR PHYS LAB, GREENBELT, MD 20771 USA. INST NUCL PHYS, MOSCOW, RUSSIA. NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. CRIMEAN ASTROPHYS OBSERV, KATZIVELY, UKRAINE. RP BENZ, AO (reprint author), ETH ZURICH, INST ASTRON, CH-8092 ZURICH, SWITZERLAND. RI Holman, Gordon/C-9548-2012 NR 47 TC 13 Z9 13 U1 0 U2 2 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD AUG PY 1994 VL 153 IS 1-2 BP 33 EP 53 DI 10.1007/BF00712491 PG 21 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PQ775 UT WOS:A1994PQ77500004 ER PT J AU SCHMIEDER, B PERES, G ENOME, S FALCIANI, R HEINZEL, P HENOUX, JC MARISKA, J REALE, F RILEE, ML ROMPOLT, B SHIBASAKI, K STEPANOV, AV WULSER, JP ZARRO, D ZHARKOVA, V AF SCHMIEDER, B PERES, G ENOME, S FALCIANI, R HEINZEL, P HENOUX, JC MARISKA, J REALE, F RILEE, ML ROMPOLT, B SHIBASAKI, K STEPANOV, AV WULSER, JP ZARRO, D ZHARKOVA, V TI ENERGY-TRANSPORT AND DYNAMICS SO SOLAR PHYSICS LA English DT Article ID BRAGG CRYSTAL SPECTROMETER; K-LINE PROFILES; X-RAY TELESCOPE; SOLAR-A MISSION; H-ALPHA; CHROMOSPHERIC FLARES; NONTHERMAL PROCESSES; PION DECAY; ATMOSPHERE; ELECTRONS AB We report findings concerning energy transport and dynamics in flares during the impulsive and gradual phases based on new ground-based and space observations (notably from Yohkoh). A preheating sometimes occurs during the impulsive phase. Ca XIX line shifts are confirmed to be good tracers of bulk plasma motions, although strong blue shifts are not as frequent as previously claimed. They often appear correlated with hard X-rays but, for some events, the concept that electron beams provide the whole energy input to the thermal component seems not to apply. Theory now yields: new diagnostics of low-energy proton and electron beams; accurate hydrodynamical modeling of pulse beam heating of the atmosphere; possible diagnostics of microflares (based on X-ray line ratio or on loop variability); and simulated images of chromospheric evaporation fronts. For the gradual phase, the continual reorganization of magnetic field lines over active regions determines where and when magnetic reconnection, the mechanism favoured for energy release, will occur. Spatial and temporal fragmentation of the energy release, observed at different wavelengths, is considered to be a factor as well in energy transport and plasma dynamics. C1 OSSERV ASTROFIS CATANIA, I-95125 CATANIA, ITALY. NOBEYAMA RADIO OBSERV, MINAMISA KU, NAGANO 38413, JAPAN. DIPARTIMENTO ASTRON, I-50125 FLORENCE, ITALY. ACAD SCI CZECH REPUBL, INST ASTRON, CR-25165 ONDREJOV, CZECH REPUBLIC. NRL, WASHINGTON, DC 20375 USA. IST OSSERV ASTRON, I-90134 PALERMO, ITALY. CORNELL UNIV, PLASMA STUDIES LAB, NEW YORK, NY USA. UNIV WROCLAW, INST ASTRON, PL-51622 WROCLAW, POLAND. CRIMEAN ASTROPHYS OBSERV, KATZIVELY, UKRAINE. UNIV HAWAII, INST ASTRON, HONOLULU, HI 96822 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. KIEV TG SHEVCHENKO STATE UNIV, DIV ASTRON, KIEV 25022, UKRAINE. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, LANARK, SCOTLAND. RP OBSERV PARIS, SECT MEUDON, F-92195 MEUDON, FRANCE. RI Heinzel, Petr/G-9014-2014; OI Reale, Fabio/0000-0002-1820-4824 NR 62 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-0938 EI 1573-093X J9 SOL PHYS JI Sol. Phys. PD AUG PY 1994 VL 153 IS 1-2 BP 55 EP 72 DI 10.1007/BF00712492 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PQ775 UT WOS:A1994PQ77500005 ER PT J AU WEBB, DF FORBES, TG AURASS, H CHEN, J MARTENS, P ROMPOLT, B RUSIN, V MARTIN, SF AF WEBB, DF FORBES, TG AURASS, H CHEN, J MARTENS, P ROMPOLT, B RUSIN, V MARTIN, SF TI MATERIAL EJECTION SO SOLAR PHYSICS LA English DT Article ID CORONAL MASS EJECTIONS; X-RAY TELESCOPE; FILAMENT ERUPTIONS; SOLAR-FLARES; MAGNETIC RECONNECTION; MECHANISM; CLOUDS; PROMINENCES; TOPOLOGY; ENERGY AB This paper reviews the major discussions and conclusions of the Flares 22 Workshop concerning the physical processes involved in mass ejecta events, with an emphasis on large-scale phenomena, especially Coronal Mass Ejections (CMEs). New insights have been gained from recent data obtained from the SMM and Yohkoh spacecraft and from several new ground-based radio and optical instruments, as well as from theoretical advances concerning the origins, driving mechanisms and long-term evolution of CMEs. C1 UNIV NEW HAMPSHIRE, EOS, CTR SPACE SCI, DURHAM, NH 03857 USA. ASTROPHYS INST POTSDAM, OBS SOLARE RADIOASTRON, D-14552 TREMSDORF, GERMANY. USN, RES LAB, BEAM PHYS BRANCH, WASHINGTON, DC 20375 USA. EUROPEAN SPACE AGCY, ESTEC, DIV SPACE SCI, 2200 AG NOORDWIJK, NETHERLANDS. UNIV WROCLAW, INST ASTRON, PL-51622 WROCLAW, POLAND. SLOVAK ACAD SCI, INST ASTRON, CR-05960 TATRANSKA LOMNIC, CZECH REPUBLIC. RP WEBB, DF (reprint author), BOSTON COLL, INST SPACE RES, NEWTON CTR, MA 02159 USA. NR 67 TC 42 Z9 46 U1 0 U2 1 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD AUG PY 1994 VL 153 IS 1-2 BP 73 EP 89 DI 10.1007/BF00712493 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PQ775 UT WOS:A1994PQ77500006 ER PT J AU CULHANE, JL PHILLIPS, AT INDAKOIDE, M KOSUGI, T FLUDRA, A KUROKAWA, H MAKISHIMA, K PIKE, CD SAKAO, T SAKURAI, T DOSCHEK, GA BENTLEY, RD AF CULHANE, JL PHILLIPS, AT INDAKOIDE, M KOSUGI, T FLUDRA, A KUROKAWA, H MAKISHIMA, K PIKE, CD SAKAO, T SAKURAI, T DOSCHEK, GA BENTLEY, RD TI YOHKOH OBSERVATIONS OF THE CREATION OF HIGH-TEMPERATURE PLASMA IN THE FLARE OF 16-DECEMBER-1991 SO SOLAR PHYSICS LA English DT Article ID X-RAY TELESCOPE; SOLAR-A MISSION; LOOP RADIATIVE HYDRODYNAMICS; HINOTORI SATELLITE; IMPULSIVE PHASE; MAXIMUM-MISSION; SPECTRA; SOFT; SPECTROMETER; EVAPORATION AB Yohkoh observations of an impulsive solar flare which occurred on 16 December, 1991 are presented. This flare was a GOES M2.7 class event with a simple morphology indicative of a single flaring loop. X-ray images were taken with the Hard X-ray Telescope (HXT) and soft X-ray spectra were obtained with the Bragg Crystal Spectrometer (BCS) on board the satellite. The spectrometer observations were made at high sensivity from the earliest stages of the flare, are continued throughout the rise and decay phases, and indicate extremely strong blueshifts, which account for the majority of emission in Ca XIX during the initial phase of the flare. The data are compared with observations from other space and ground-based instruments. A balance calculation is performed which indicates that the energy contained in non-thermal electrons is sufficient to explain the high temperature plasma which fills the loop. The cooling of this plasma by thermal conduction is independently verified in a manner which indicates that the loop filling factor is close to 100%. The production of 'superhot' plasma in impulsive events is shown to differ in detail from the morphology and mechanisms appropriate for more gradual events. C1 UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, SURREY, ENGLAND. KYOTO OBSERV, HIDA OBSERV, GIFU 50613, JAPAN. UNIV TOKYO, FAC SCI, DEPT PHYS, TOKYO 113, JAPAN. RUTHERFORD APPLETON LAB, CHILTON OX11 0QX, ENGLAND. NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. USN, RES LAB, WASHINGTON, DC 20375 USA. RP CULHANE, JL (reprint author), NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. NR 50 TC 43 Z9 43 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD AUG PY 1994 VL 153 IS 1-2 BP 307 EP 336 DI 10.1007/BF00712508 PG 30 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PQ775 UT WOS:A1994PQ77500021 ER PT J AU PRIEBUS, MH BRYNER, C KISER, WR AF PRIEBUS, MH BRYNER, C KISER, WR TI ALBUMIN LEVELS AMONG GERIATRIC-PATIENTS SO SOUTHERN MEDICAL JOURNAL LA English DT Letter RP PRIEBUS, MH (reprint author), USN HOSP,DEPT FAMILY PRACTICE,JACKSONVILLE,FL 32214, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SOUTHERN MEDICAL ASSN PI BIRMINGHAM PA 35 LAKESHORE DR PO BOX 190088, BIRMINGHAM, AL 35219 SN 0038-4348 J9 SOUTHERN MED J JI South.Med.J. PD AUG PY 1994 VL 87 IS 8 BP 867 EP 867 DI 10.1097/00007611-199408000-00031 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA PB488 UT WOS:A1994PB48800031 PM 8052910 ER PT J AU DONOVAN, EP HUBLER, GK MUDHOLKAR, MS THOMPSON, LT AF DONOVAN, EP HUBLER, GK MUDHOLKAR, MS THOMPSON, LT TI ION-BEAM-ASSISTED DEPOSITION OF MOLYBDENUM NITRIDE FILMS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID MON FILMS; HYDRODENITROGENATION; SUPERCONDUCTIVITY; FUNDAMENTALS AB A series of molybdenum nitride films was synthesized by electron beam evaporative deposition of molybdenum, with simultaneous bombardment by nitrogen ions from a Kaufman ion source. The nitrogen ions were accelerated to 500 or 1000 eV. The film compositions and structures were determined using Rutherford backscattering spectrometry and X-ray diffraction respectively. Effective reflection and sputtering coefficients for nitrogen incident on the molybdenum nitride surfaces were extracted from the data. These coefficients were used to calibrate the deposition system and allowed the deposition of molybdenum nitride films with control of the nitrogen atom concentration to +/-2.3 at.%. In general, the films were polycrystalline with a high degree of texturing. The phases found in order of increasing measured nitrogen content were as follows: gamma-Mo2N (f.c.c.), beta-Mo16N7 (b.c.t.), B1-MoN (f.c.c.) then delta-MoN (h.c.p.). C1 UNIV MICHIGAN,DEPT CHEM ENGN,ANN ARBOR,MI 48109. USN,RES LAB,WASHINGTON,DC 20375. NR 16 TC 21 Z9 24 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD AUG PY 1994 VL 66 IS 1-3 BP 499 EP 504 DI 10.1016/0257-8972(94)90056-6 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA PA172 UT WOS:A1994PA17200055 ER PT J AU FERRER, FA MCKENNA, PH DONNAL, JF AF FERRER, FA MCKENNA, PH DONNAL, JF TI NONINVASIVE ANGIOGRAPHY IN PREOPERATIVE EVALUATION OF COMPLICATED PEDIATRIC RENAL MASSES USING PHASE-CONTRAST MAGNETIC-RESONANCE ANGIOGRAPHY SO UROLOGY LA English DT Article ID MR ANGIOGRAPHY; ARTERIES AB Objectives. To report a new technique called ''phase contrast magnetic resonance angiography'' (PC MRA) utilizing phase contrast magnetic resonance imaging, for assessing the renal vasculature in relation to complicated pediatric renal masses. Methods. Three-dimensional phase contrast gradient refocused pulse sequences were obtained on four pediatric patients with complicated renal masses. Findings were compared to ultrasound and computed tomographic images and correlated with actual surgical anatomy. Results. In all four cases PC MRA provided standard angiographic quality detail of the renal vascular anatomy. The PC MRA findings had a 100% correlation with surgical exploration and MRA proved to be approximately one third the cost of the standard angiographic technique. Conclusions. Our experience with the use of PC MRA in children suggests that it can be helpful in evaluating the vasculature of complicated pediatric renal masses. PC MRA utilizes current generation magnetic resonance units, is noninvasive, and does not require anesthesia. It may be especially useful in patients with hypersensitivity to contrast agents, in those with renal failure in whom contrast agents may be contraindicated, and is less expensive than standard angiography. C1 NAVAL MED CTR PORTSMOUTH,DEPT RADIOL,PORTSMOUTH,VA 23708. NAVAL MED CTR PORTSMOUTH,DEPT UROL,DIV PEDIAT UROL,PORTSMOUTH,VA 23708. NR 15 TC 3 Z9 3 U1 0 U2 1 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD AUG PY 1994 VL 44 IS 2 BP 254 EP 259 DI 10.1016/S0090-4295(94)80144-4 PG 6 WC Urology & Nephrology SC Urology & Nephrology GA PA802 UT WOS:A1994PA80200019 PM 8048202 ER PT J AU JOHNSTONE, PAS SPRAGUE, M DELUCA, AM BACHER, JD HAMPSHIRE, VA TERRILL, RE KINSELLA, TJ SINDELAR, WF AF JOHNSTONE, PAS SPRAGUE, M DELUCA, AM BACHER, JD HAMPSHIRE, VA TERRILL, RE KINSELLA, TJ SINDELAR, WF TI EFFECTS OF INTRAOPERATIVE RADIOTHERAPY ON VASCULAR GRAFTS IN A CANINE MODEL SO INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS LA English DT Article DE ANIMALS MODELS; CANINE; INTRAOPERATIVE RADIOTHERAPY; NORMAL TISSUE TOLERANCE; VASCULAR GRAFTS ID RADIATION-THERAPY; VENA-CAVA; TOLERANCE; RETROPERITONEAL; IRRADIATION; IORT; AORTA AB Purpose: The effects of intraoperative radiotherapy +/- external beam radiotherapy on prosthetic vascular grafts were investigated in a canine model. Methods and Materials: In 1986 and 1987, 30 adult beagles underwent laparotomy with transection and segmental resection of the infrarenal aorta followed by immediate reconstruction with a prosthetic graft. Intraoperative radiotherapy at varying doses from 0-30 Gy was then administered to all animals. Half of the dogs received 36 Gy external beam radiotherapy in 10 fractions postoperatively. Animals were sacrificed and necropsied at predetermined intervals and as clinically indicated to assess early (less than or equal to 6 months) and late (> 6 months) effects to the vascular graft and surrounding normal tissue. Results: Histopathologic analyses of irradiated vascular structures were performed and correlations were made with the clinical outcome. The most frequent early clinical toxicity was graft thrombosis, occurring in 7 of 10 animals followed for less than or equal to 6 months. Early graft thrombus formation appeared unrelated to radiotherapy dose and probably represented a technical surgical complication. Anastomotic stenosis of varying severity occurred in most animals followed > 6 months. Late (> 6 months) graft stenosis was correlated with intraoperative radiotherapy dose. At less than or equal to 20 Gy of intraoperative irradiation, 3 of 14 animals developed late graft occlusion; at > 25 Gy, five of six animals developed late occlusion. On histopathologic review, increasing intraoperative dose and increasing total radiotherapy dose (intraoperative + external beam) appeared to correspond with increasing severity of graft changes seen after 6 months of follow-up. Conclusions: Thrombus formation is a frequent early complication of vascular graft placement of the infrarenal aorta in our beagle dog model. Intraoperative doses up to 20 Gy appear to contribute minimally to late graft occlusion, while doses greater than or equal to 25 Gy contribute to late occlusion with high likelihood. Both intraoperative dose and total radiotherapy dose correlated with late graft occlusion, and with histopathologic changes in the graft and anastomoses. C1 NCI,RADIAT ONCOL BRANCH,BETHESDA,MD 20892. NCI,SURG BRANCH,BETHESDA,MD 20892. NCI,OFF LAB ANIM SCI,BETHESDA,MD 20892. NIH,NATL CTR RES RESOURCES,VET RESOURCES PROGRAM,BETHESDA,MD 20892. RP JOHNSTONE, PAS (reprint author), USN,CTR MED,DIV RADIAT ONCOL,SAN DIEGO,CA 92134, USA. NR 22 TC 18 Z9 18 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-3016 J9 INT J RADIAT ONCOL JI Int. J. Radiat. Oncol. Biol. Phys. PD JUL 30 PY 1994 VL 29 IS 5 BP 1015 EP 1025 PG 11 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA PE338 UT WOS:A1994PE33800012 PM 8083070 ER PT J AU CHANG, EL AF CHANG, EL TI UNUSUAL THERMAL-STABILITY OF LIPOSOMES MADE FROM BIPOLAR TETRAETHER LIPIDS SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID SULFOLOBUS-ACIDOCALDARIUS AB The thermal stability of liposomes made from polar lipids of Sulfolobus acidocaldarius, a thermoacidophilic archaebacterium, was studied. While two analogous nonarchaebacterial liposomes examined were unstable above 50 degrees C, liposomes made of the native tetraether lipids showed stability up to at least 80 degrees C. Incubation of the archaebacterial liposomes at 100 degrees C, under slight pressure, caused an approximate 15 % leakage after 60 minutes. Boiling, however, destroys the integrity of the lipid membranes. The tetraether lipid vesicles are less permeable to solute molecules, such as carboxyfluorescein, than the other lipid vesicles at any temperature. The permeability is also less temperature-sensitive than that for other lipids. (C) 1994 Academic Press, Inc. RP CHANG, EL (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 17 TC 61 Z9 63 U1 2 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD JUL 29 PY 1994 VL 202 IS 2 BP 673 EP 679 DI 10.1006/bbrc.1994.1983 PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NZ240 UT WOS:A1994NZ24000005 PM 8048936 ER PT J AU BEZRUKOV, SM VODYANOY, I PARSEGIAN, VA AF BEZRUKOV, SM VODYANOY, I PARSEGIAN, VA TI COUNTING POLYMERS MOVING THROUGH A SINGLE-ION CHANNEL SO NATURE LA English DT Article ID PROBING ALAMETHICIN CHANNELS; WATER-SOLUBLE POLYMERS; MEMBRANES; MODEL AB THE change in conductance of a small electrolyte-filled capillary owing to the passage of sub-micrometre-sized particles has long been used for particle counting and sizing. A commercial device for such measurements, the Coulter counter, is able to detect particles of sizes down to several tenths of a micrometre(1-3). Nuclepore technology (in which pores are etched particle tracks) has extended the lower limit of size detection to 60-nm particles by using a capillary of diameter 0.45 mu m (ref. 4). Here we show that natural channel-forming peptides incorporated into a bilayer lipid membrane can be used to detect the passage of single molecules with gyration radii as small as 5-15 Angstrom. From our experiments with alamethicin pores we infer both the average number and the diffusion coefficients of poly(ethylene glycol) molecules in the pore. Our approach provides a means of observing the statistics and mechanics of flexible polymers moving within the confines of precisely defined single-molecule structures. C1 NIH,DCRT,STRUCT BIOL LAB,BETHESDA,MD 20892. RUSSIAN ACAD SCI,INST NUCL PHYS,ST PETERSBURG 188350,RUSSIA. OFF NAVAL RES,ARLINGTON,VA 22217. RP BEZRUKOV, SM (reprint author), NIDDK,DIV INTRAMURAL RES,BETHESDA,MD 20892, USA. NR 20 TC 259 Z9 261 U1 7 U2 42 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUL 28 PY 1994 VL 370 IS 6487 BP 279 EP 281 DI 10.1038/370279a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NZ229 UT WOS:A1994NZ22900058 PM 7518571 ER PT J AU NOUNESIS, G KUMAR, S PFEIFFER, S SHASHIDHAR, R GARLAND, CW AF NOUNESIS, G KUMAR, S PFEIFFER, S SHASHIDHAR, R GARLAND, CW TI EXPERIMENTAL-OBSERVATION OF A TRANSITION BETWEEN 2 UNIAXIAL NEMATIC LIQUID-CRYSTAL PHASES SO PHYSICAL REVIEW LETTERS LA English DT Article ID CRITICAL-BEHAVIOR; SMECTIC-A1; POLYMORPHISM AB The experimental observation of a phase transition between two uniaxial nematic liquid-crystalline phases is reported. High-resolution x-ray scattering and ac calorimetric studies on binary mixtures of octyl- and decyloxyphenyl-nitrobenzoyloxy benzoates show evidence of a first-order transition between two nematic phases with different types of short-range smectic order. This transition is observed in the vicinity of the termination of the smectic-A(d)-Smectic-A(l) phase boundary, in accordance with theoretical predictions. C1 MIT, FRANCIS BITTER NATL MAGNET LAB, CAMBRIDGE, MA 02139 USA. MIT, CTR MAT SCI & ENGN, CAMBRIDGE, MA 02139 USA. KENT STATE UNIV, INST LIQUID CRYSTAL, KENT, OH 44242 USA. KENT STATE UNIV, DEPT PHYS, KENT, OH 44242 USA. USN, RES LAB, CTR BIOMOLEC SCI & ENGN, WASHINGTON, DC 20375 USA. MIT, SCH SCI, CAMBRIDGE, MA 02139 USA. RP NOUNESIS, G (reprint author), MIT, FRANCIS BITTER NATL MAGNET LAB, CAMBRIDGE, MA 02139 USA. NR 22 TC 20 Z9 20 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 25 PY 1994 VL 73 IS 4 BP 565 EP 568 DI 10.1103/PhysRevLett.73.565 PG 4 WC Physics, Multidisciplinary SC Physics GA NZ237 UT WOS:A1994NZ23700015 ER PT J AU BINARI, SC ROWLAND, LB KRUPPA, W KELNER, G DOVERSPIKE, K GASKILL, DK AF BINARI, SC ROWLAND, LB KRUPPA, W KELNER, G DOVERSPIKE, K GASKILL, DK TI MICROWAVE PERFORMANCE OF GAN MESFETS SO ELECTRONICS LETTERS LA English DT Article DE SOLID-STATE MICROWAVE DEVICES; MESFETS AB GaN MESFETs have been fabricated with a 0.25mum thick channel on a high resistivity GaN layer grown by metal organic vapour phase epitaxy. These devices have a transconductance of 20mS/mm. For a 0.7mum gate length device, the measured f(T) and f(max) were 8 and 17GHz, respectively. C1 SFA INC,LANDOVER,MD 20785. RP BINARI, SC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Rowland, Larry/C-4487-2008 NR 6 TC 142 Z9 142 U1 1 U2 8 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD JUL 21 PY 1994 VL 30 IS 15 BP 1248 EP 1249 DI 10.1049/el:19940833 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA PA871 UT WOS:A1994PA87100041 ER PT J AU LEE, RL AF LEE, RL TI HORIZON BRIGHTNESS REVISITED - MEASUREMENTS AND A MODEL OF CLEAR-SKY RADIANCES SO APPLIED OPTICS LA English DT Article DE HORIZON BRIGHTNESS; CLEAR-SKY RADIANCE; DIGITAL IMAGE ANALYSIS; ATMOSPHERIC OPTICS; MULTIPLE SCATTERING ID DIFFUSE SOLAR-RADIATION; ANGULAR-DISTRIBUTION; LUMINANCE; COLORS AB Clear daytime skies persistently display a subtle local maximum of radiance near the astronomical horizon. Spectroradiometry and digital image analysis confirm this maximum's reality, and they show that its angular width and elevation vary with solar elevation, azimuth relative to the Sun, and aerosol optical depth. Many existing models of atmospheric scattering do not generate this near-horizon radiance maximum, but a simple second-order scattering model does, and it reproduces many of the maximum's details. RP LEE, RL (reprint author), USN ACAD, DEPT OCEANOG, ANNAPOLIS, MD 21402 USA. NR 24 TC 16 Z9 16 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 20 PY 1994 VL 33 IS 21 BP 4620 EP + PG 0 WC Optics SC Optics GA PB632 UT WOS:A1994PB63200013 PM 20935831 ER PT J AU LEE, RL AF LEE, RL TI TWILIGHT AND DAYTIME COLORS OF THE CLEAR-SKY SO APPLIED OPTICS LA English DT Article DE ATMOSPHERIC OPTICS; CLEAR-SKY CHROMATICITIES; BLUE SKY; TWILIGHT COLORS; DIGITAL IMAGE ANALYSIS AB Digital image analysis of the cloudless sky's daytime and twilight chromaticities challenges some existing ideas about sky colors. First, although the observed colors of the clear daytime sky do lie near the blackbody locus, their meridional chromaticity curves may resemble it very little. Second, analyses of twilight colors show that their meridional chromaticity curves vary greatly, with some surprising consequences for their colorimetric gamuts. RP LEE, RL (reprint author), USN ACAD, DEPT OCEANOG, ANNAPOLIS, MD 21402 USA. NR 23 TC 18 Z9 18 U1 1 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 20 PY 1994 VL 33 IS 21 BP 4629 EP + PG 0 WC Optics SC Optics GA PB632 UT WOS:A1994PB63200014 PM 20935832 ER PT J AU WANG, YM SHEELEY, NR AF WANG, YM SHEELEY, NR TI THE ROTATION OF PHOTOSPHERIC MAGNETIC-FIELDS - A RANDOM-WALK TRANSPORT MODEL SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, MAGNETIC FIELDS; SUN, ROTATION ID SOLAR ROTATION; DIFFERENTIAL ROTATION; MOUNT-WILSON; PATTERNS; FEATURES; REGIONS; FLOW; SUN AB In an earlier study of solar differential rotation, we showed that the transport of magnetic flux across latitudes acts to establish quasi-stationary patterns, thereby accounting for the observed rigid rotation of the large-scale photospheric field. In that paper, the effect of supergranular convection was represented by a continuum diffusion, limiting the applicability of the calculations to large spatial scales. Here we extend the model to scales comparable to that of the supergranulation itself by replacing the diffusive transport with a discrete random walk process. Rotation curves are derived by cross-correlating the simulated photospheric field maps for a variety of time lags and spatial resolutions. When the lag between maps is relatively short (less-than-or-similar-to 15 days), the midlatitude correlation functions show two distinct components: a broad feature associated with the large-scale unipolar patterns and a narrow feature originating from smaller magnetic structures encompassing from one to several supergranular cells. By fitting the broad component, we obtain the rigid rotation profile of the patterns, whereas by fitting the narrow component, we recover the differential rate of the photospheric plasma itself. For time lags of 1 month or greater, only the broad feature associated with the long-lived patterns remains clearly identifiable in the simulations. RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7672,WASHINGTON,DC 20375, USA. NR 27 TC 51 Z9 51 U1 1 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 20 PY 1994 VL 430 IS 1 BP 399 EP 412 DI 10.1086/174415 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NW513 UT WOS:A1994NW51300038 ER PT J AU LEE, JS GRUNES, MR KWOK, R AF LEE, JS GRUNES, MR KWOK, R TI CLASSIFICATION OF MULTI-LOOK POLARIMETRIC SAR IMAGERY-BASED ON COMPLEX WISHART DISTRIBUTION SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article AB Multi-look polarimetric SAR (synthetic aperture radar) data can be represented either in Mueller matrix form or in complex covariance matrix form. The latter has a complex Wishart distribution. A maximum likelihood classifier to segment polarimetric SAR data according to terrain types has been developed based on the Wishart distribution. This algorithm can also be applied to multi-frequency multi-look polarimetric SAR data, as well as to SAR data containing only intensity information. A procedure is then developed for unsupervised classification. The classification error is assessed by using Monte Carlo simulation of multi-look polarimetric SAR data, owing to the lack of ground truth for each pixel. Comparisons of classification errors using the training sets and single-look data are also made. Applications of this algorithm are demonstrated with NASA/JPL P-, L- and C-band polarimetric SAR data. C1 JET PROP LAB,PASADENA,CA 91109. RP LEE, JS (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7230,WASHINGTON,DC 20375, USA. RI Kwok, Ron/A-9762-2008 OI Kwok, Ron/0000-0003-4051-5896 NR 17 TC 303 Z9 349 U1 2 U2 32 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD JUL 20 PY 1994 VL 15 IS 11 BP 2299 EP 2311 PG 13 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA PD650 UT WOS:A1994PD65000011 ER PT J AU NAZERI, A AF NAZERI, A TI CRYSTALLIZATION OF SOL-GEL DEPOSITED POTASSIUM-TANTALATE-NIOBATE THIN-FILMS ON PLATINUM SO APPLIED PHYSICS LETTERS LA English DT Article AB Potassium tantalate niobate (KTN) ferroelectric thin films prepared by sol-gel processing have been heat treated in conventional furnaces and through rapid thermal annealing (RTA) to investigate crystallization of the films. Various key factors such as time and temperature influencing the crystallization have been identified. A post-deposition RTA at 750-degrees-C in nitrogen for 5 min crystallized the KTN films into pure perovskite while it took two hours to completely crystallize a similar KTN film in conventional ovens. The effect of preheat treatment at lower temperatures, solution chemistry, and the thickness have also been studied. Preliminary ferroelectric properties of some samples are also presented. RP NAZERI, A (reprint author), USN,RES LAB,CODE 6374,WASHINGTON,DC 20375, USA. NR 6 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 18 PY 1994 VL 65 IS 3 BP 295 EP 297 DI 10.1063/1.112351 PG 3 WC Physics, Applied SC Physics GA NY104 UT WOS:A1994NY10400013 ER PT J AU ROLAND, CM AF ROLAND, CM TI CONSTRAINTS ON LOCAL SEGMENTAL MOTION IN POLY(VINYLETHYLENE) NETWORKS SO MACROMOLECULES LA English DT Article ID GLASS-TRANSITION TEMPERATURE; INTERMOLECULAR COOPERATIVITY; DIELECTRIC-RELAXATION; CONFORMATIONAL TRANSITIONS; RUBBER ELASTICITY; DYNAMICS; POLYMERS; POLYISOPRENE; LIQUIDS; TIME AB Dielectric spectroscopy was used to study segmental relaxation in a series of poly(vinylethylene) (PVE) networks. Increasing cross-link density is associated with increasing glass transition temperatures (T(g)) and broader segmental relaxation functions. T(g)-scaled Arrhenius plots of the segmental relaxation times indicate that enhanced intermolecular coupling is the primary mechanism for the observed changes. This is in contrast to the effects of blending and crystallization, both of which cause changes to the segmental relaxation spectra similar to that from cross-linking. However, the origin of these changes is quite different. RP ROLAND, CM (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 58 TC 121 Z9 121 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 18 PY 1994 VL 27 IS 15 BP 4242 EP 4247 DI 10.1021/ma00093a027 PG 6 WC Polymer Science SC Polymer Science GA NY418 UT WOS:A1994NY41800027 ER PT J AU SINGH, DJ PICKETT, WE AF SINGH, DJ PICKETT, WE TI UNCONVENTIONAL OXYGEN DOPING BEHAVIOR IN HGBA2CA2CU3O8+DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRON POWDER DIFFRACTION; ELECTRONIC-STRUCTURE; VANHOVE SINGULARITIES; FERMI-SURFACE; SUPERCONDUCTIVITY; HGBA2CUO4+DELTA; TEMPERATURE; HGBA2CACU2O6+DELTA; MERCURY; 150-K AB Local density approximation supercell calculations for (HgBa2Ca2Cu3O8)2O are used to elucidate the effects of oxygen doping on HgBa2Ca2Cu3O8. The CuO2 planes are found to be hole doped by the addition of O in the O(4) site. The doping level is considerably lower than would be predicted assuming that O enters as O2- ions. Rather, strong covalency is found between the dopant O(4) and Hg atoms. States associated with the neighboring Hg atoms are pushed up in energy by occupation of the O(4) site to the extent that some antibonding O(4)-p Hg-d states occur above the Fermi energy. Thus the hole doping of the CuO2 layers is reduced by nearly half from that expected from ionic considerations, and this is accompanied by a coalescence of the three plane derived Fermi surfaces. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 27 TC 55 Z9 55 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 18 PY 1994 VL 73 IS 3 BP 476 EP 479 DI 10.1103/PhysRevLett.73.476 PG 4 WC Physics, Multidisciplinary SC Physics GA NX801 UT WOS:A1994NX80100028 ER PT J AU FLIPPENANDERSON, JL GEORGE, C DESCHAMPS, JR AF FLIPPENANDERSON, JL GEORGE, C DESCHAMPS, JR TI METHYL N,N-DIALLYL-O-TERT-BUTYLTYROSYL-ALPHA-AMINOISOBUTYRL-ALPHA-AMINOISOBUTYR ATE, C28H43N3O5 SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB In this N- and C-protected tripeptide the nine backbone atoms are essentially planar and fully extended except for N1 and C3' which lie below the plane and are folded in towards it. The tyrosine side chain extends away from the opposite side of the plane. There is one (N-H)i...(O=C)i intramolecular hydrogen bond and a weak (N-H)i+2...(O=C)i intermolecular hydrogen bond [where (i) = 2]. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JUL 15 PY 1994 VL 50 BP 1095 EP 1097 DI 10.1107/S0108270193012387 PN 7 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA NY780 UT WOS:A1994NY78000048 PM 8074811 ER PT J AU MATTHEW, J MARSH, SJ DIALETIS, D KAPETANAKOS, CA AF MATTHEW, J MARSH, SJ DIALETIS, D KAPETANAKOS, CA TI BEAM TRAPPING IN A MODIFIED BETATRON ACCELERATOR WITH A LOCALIZED BIPOLAR ELECTRIC-FIELD PULSE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RING AB A trapping concept for the injected beam in a modified betatron accelerator using a localized inductive electric-field pulse generated by a charged coaxial pulse line is described. The average canonical angular momentum [P(theta)] is not conserved in this scheme. Numerical simulations demonstrate trapping over a wide range of operating parameters. A 0.84 OMEGA, 45 ns water dielectric pulse line has been built for testing the trapping concept. The pulse line is switched using triggered vacuum surface flashover switches. Test results show that a single bipolar output pulse can be obtained if the pulse line is crowbarred. For 15-40 kV pulses, the observed rise time is roughly 20 ns. C1 SFA INC,LANDOVER,MD 20785. SAIC,MCLEAN,VA 22102. RP MATTHEW, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 16 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1994 VL 76 IS 2 BP 648 EP 659 DI 10.1063/1.357807 PG 12 WC Physics, Applied SC Physics GA NX400 UT WOS:A1994NX40000003 ER PT J AU KAXIRAS, E BOYER, LL AF KAXIRAS, E BOYER, LL TI ENERGETICS OF LARGE LATTICE STRAINS - APPLICATION TO SILICON SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; LIQUID SILICON; GERMANIUM; ORDER AB We discuss the mathematical formalism of physically allowed lattice-invariant strains. When coupled with first-principles calculations of the energy as a function of strain, this approach becomes a powerful tool for understanding large lattice strains in solids. We also present an application of this tool to explore deformations of silicon, which predicts, to our knowledge, a previously unknown metastable structure. The physical properties of this structure are described and a method for obtaining it experimentally is explicitly provided. C1 USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. RP HARVARD UNIV, DEPT PHYS, CAMBRIDGE, MA 02138 USA. NR 29 TC 16 Z9 16 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1994 VL 50 IS 3 BP 1535 EP 1540 DI 10.1103/PhysRevB.50.1535 PG 6 WC Physics, Condensed Matter SC Physics GA NZ153 UT WOS:A1994NZ15300019 ER PT J AU SHANABROOK, BV BENNETT, BR AF SHANABROOK, BV BENNETT, BR TI PLANAR VIBRATIONAL-MODES AS PROBES OF INTERFACE STRUCTURE SO PHYSICAL REVIEW B LA English DT Article ID BEAM-EPITAXIAL-GROWTH; INAS/GASB SUPERLATTICES; GA1-XINXSB/INAS SUPERLATTICES; RAMAN-SCATTERING; BAND OFFSETS; PHONONS; HETEROSTRUCTURES; HETEROJUNCTIONS; SEGREGATION AB Raman-scattering studies are reported for a vibrational mode with an eigenvector localized at planes of interface atoms of heterojunctions. These planar vibrational modes (PVM's) are studied in a variety of structures formed in the III-V 6.1-angstrom semiconductor materials family of GaSb, InAs, and AlSb with interface planes involving GaAs or AlAs bonds. The results of these measurements are compared with calculations of the eigenvectors and eigenenergies of the PVM's and are related to a simple one-dimensional model that describes the segregation of atoms during growth. RP SHANABROOK, BV (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 27 TC 24 Z9 24 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1994 VL 50 IS 3 BP 1695 EP 1700 DI 10.1103/PhysRevB.50.1695 PG 6 WC Physics, Condensed Matter SC Physics GA NZ153 UT WOS:A1994NZ15300040 ER PT J AU KONKOWSKI, DA HELLIWELL, TM AF KONKOWSKI, DA HELLIWELL, TM TI INSTABILITIES OF THE CAUCHY HORIZON IN KERR BLACK-HOLES SO PHYSICAL REVIEW D LA English DT Article ID QUASIREGULAR SINGULARITIES; ELECTROMAGNETIC-FIELDS; STABILITY; COSMOLOGIES; SPACETIME; INTERIOR AB A previously developed Cauchy horizon stability conjecture is used to investigate the stability of the Cauchy horizon in the Kerr geometry when various fields are introduced. In particular, the effects of an electromagnetic field, infalling null dust, and combined infalling and outgoing null dust are studied. Stability predictions are made and in one case verified. The nature of any resulting singularities is predicted. C1 HARVEY MUDD COLL,DEPT PHYS,CLAREMONT,CA 91711. RP KONKOWSKI, DA (reprint author), USN,NAVAL ACAD,ANNAPOLIS,MD 21402, USA. NR 20 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 15 PY 1994 VL 50 IS 2 BP 841 EP 845 DI 10.1103/PhysRevD.50.841 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NY131 UT WOS:A1994NY13100019 ER PT J AU FROST, AE SEAVER, M AF FROST, AE SEAVER, M TI IONIC EFFECTS ON SOLID-PHASE FORMATION IN 1-OCTADECANOL FILMS ON LEVITATED WATER DROPS SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 6th International Conference on Organized Molecular Films CY JUL 04-09, 1993 CL TROIS RIVIERES, CANADA ID OCTADECANOL MONOLAYERS; WIND-TUNNEL; EVAPORATION; KINETICS AB Levitated drops of water containing dispersed 1-octadecanol particles were evaporated into a flowing gas stream Evaporation and resulting shrinkage of the drop collected the 1-octadecanol at the drop surface, concentrating the 1-octadecanol to surface densities more than ten times those needed for a phase change in Langmuir trough experiments, before the appearance of the solid (S) surface phase was observed. When acidic species were introduced into the aqueous substrate, this delay was reduced, and for initial pH values less than or equal to 4, the S phase of 1-octadecanol appeared at surface densities predicted from Langmuir trough data, i.e. no delay was observed. Ionic species in pH neutral substrate also speeded the phase change, but less markedly. The addition of NaOH further retarded the phase change at a concentration of 2 x 10(-4) M but exhibited no effect at 2 x 10(-5) M and lower concentrations. The effect of each ionic species added to the substrate on S phase formation was also concentration dependent, being most pronounced at initial concentrations above 1 x 10(-4) M, and indistinguishable from pure water below approximately 4.0 x 10(-7) M. Light-scattering measurements on the experimental mixtures showed that 1-octadecanol in aqueous mixtures exists as small ( < 400 nm radius) particles. RP FROST, AE (reprint author), USN,RES LAB,CODE 5610,WASHINGTON,DC 20375, USA. NR 16 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD JUL 15 PY 1994 VL 247 IS 2 BP 184 EP 189 DI 10.1016/0040-6090(94)90797-8 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NX691 UT WOS:A1994NX69100008 ER PT J AU JACOBSEN, RL EHRLICH, AC AF JACOBSEN, RL EHRLICH, AC TI VIBRATING-REED DYNAMICS IN A MAGNETIC-FIELD SO PHYSICAL REVIEW LETTERS LA English DT Article AB Magnetic fields may alter the flexural resonant frequencies of vibrating reeds that possess anisotropic magnetic susceptibility. The magnitude of the effect is a quadratic in the field strength. It is also a function of field orientation, the reed's aspect ratio and Young's modulus, the vibrational mode, and the magnetic susceptibility tensor. This phenomenon can provide a direct and extremely sensitive measure of magnetic anisotropy. RP JACOBSEN, RL (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 11 TC 7 Z9 8 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 11 PY 1994 VL 73 IS 2 BP 348 EP 351 DI 10.1103/PhysRevLett.73.348 PG 4 WC Physics, Multidisciplinary SC Physics GA NW184 UT WOS:A1994NW18400033 ER PT J AU WALJESKI, K MOSES, D DERE, KP SABA, JLR STRONG, KT WEBB, DF ZARRO, DM AF WALJESKI, K MOSES, D DERE, KP SABA, JLR STRONG, KT WEBB, DF ZARRO, DM TI THE COMPOSITION OF A CORONAL ACTIVE-REGION SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ABUNDANCES; SUN, ACTIVITY; SUN, X-RAYS, GAMMA RAYS ID WAVE COLLISION STRENGTHS; HELIUM-LIKE IONS; F-LIKE IONS; OSCILLATOR-STRENGTHS; ELEMENTAL ABUNDANCES; ENERGETIC PARTICLES; RATE COEFFICIENTS; SOLAR ATMOSPHERE; ELECTRON-IMPACT; EXCITATION AB The relative abundances of iron, oxygen, magnesium, and neon in a coronal active region are determined from measurements of soft X-ray line and broadband intensities. The emission measure, temperature, and column density are derived from these measured intensities and are used to place a constraint on the abundances of the heavier elements relative to hydrogen in the corona. The intensity measurements were made on 1987 December 11, when an active region was observed jointly by the American Science and Engineering (AS&E) High Resolution Soft X-Ray Imaging Sounding-Rocket Payload and the X-Ray Polychromator Flat Crystal Spectrometer (FCS) onboard the Solar Maximum Mission spacecraft. The coordinated observations include images through two broadband filters (8-29 angstrom and 8-39, 44-60 angstrom) and profiles of six emission lines: Fe XVII (15.01 angstrom), Fe XVII (15.26 angstrom), O VIII (18.97 angstrom), Mg XI (9.17 angstrom), Ne IX (13.44 angstrom), and Fe XVIII (14.21 angstrom). The effects of resonance scattering are considered in the interpretation of the FCS line intensities. We calculated the expected intensity ratio of the two Fe XVII lines as a function of optical depth and compared this ratio with the observed intensity ratio to obtain the optical depths of each of the lines and the column density. The line intensities and the broadband filtered images are consistent with the emission from a thermal plasma where Fe, O, Mg, and Ne have the ''adopted coronal'' abundances of Meyer (1985b) relative to one another, but are not consistent with the emission from a plasma having photospheric abundances: The ratios of the abundances of the low first ionization potential (FIP) elements (Fe and Mg) to the abundances of the high-FIP elements (Ne and O) are higher than the ratios seen in the photosphere by a factor of about 3.5. This conclusion is independent of the assumption of either an isothermal or a multithermal plasma. The column densities derived from the Fe XVII line ratio and the geometry of the active region provide a diagnostic of the abundance of hydrogen relative to the heavier elements. We find that the abundance of iron with respect to hydrogen in the corona is higher than the value given Meyer (1985b) by a factor of 8.2 (-5.4, +5.1). This means that, for the observed active region, the absolute abundances of the low-FIP elements (Fe and Mg) are enhanced in the corona relative to the photosphere, while the abundances of the high-FIP elements (Ne and O) are either slightly enhanced in the corona or nearly the same in the photosphere and the corona. C1 LOCKHEED SOLAR & ASTROPHYS LAB,PALO ALTO,CA 94304. BOSTON COLL,INST SPACE RES,NEWTON,MA 02159. RP WALJESKI, K (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 44 TC 53 Z9 55 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 10 PY 1994 VL 429 IS 2 BP 909 EP 923 DI 10.1086/174375 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NW014 UT WOS:A1994NW01400042 ER PT J AU COOK, JW KEENAN, FP HARRA, LK TAYAL, SS AF COOK, JW KEENAN, FP HARRA, LK TAYAL, SS TI CORONAL ELECTRON-DENSITY DIAGNOSTIC FROM FE XII SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, CORONA; SUN, FLARES; ULTRAVIOLET, SOLAR SYSTEM ID OSCILLATOR-STRENGTHS; ENERGY-LEVELS; SOLAR CORONA; LINE RATIOS; TRANSITIONS; EXCITATION; FLARE; SUN AB We present observations of the forbidden coronal lines Fe XII 1242 angstrom and 1349 angstrom from active regions and from two flares, obtained by the SO82B slit spectrograph onboard Skylab. The line intensity ratio R = I(1242 angstrom)/I(1349 angstrom) is sensitive to electron density. We have calculated this ratio using recent atomic data, and obtained coronal electron densities at T = 1.5 x 10(6) K for our observations. We find a range in N(e) of (0.5-7.2) x 10(9) cm-3 for active regions, which is in good agreement with previous results from other diagnostic ratios in this temperature range, and of approximately (0.9-12) x 10(9) cm-3 (or higher) for flares, which is generally low compared to previous flare results. The flare values employ particularly weak 1349 angstrom observations and may not be reliable. From an observation of an active region just inside the solar limb, giving the best coverage in our data of both line profiles, we find a line width (FWHM) for both lines of 0.20 angstrom, which corresponds to a nonthermal velocity of 18 km s-1. RP COOK, JW (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7663,WASHINGTON,DC 20375, USA. OI Harra, Louise/0000-0001-9457-6200 NR 25 TC 6 Z9 6 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 10 PY 1994 VL 429 IS 2 BP 924 EP 927 DI 10.1086/174376 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NW014 UT WOS:A1994NW01400043 ER PT J AU MCLEOD, MG AF MCLEOD, MG TI MAGNETOSPHERIC AND IONOSPHERIC SIGNALS IN MAGNETIC OBSERVATORY MONTHLY MEANS - ELECTRICAL-CONDUCTIVITY OF THE DEEP MANTLE SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article AB First differences of magnetic observatory monthly means for 1963-1982 were analyzed using techniques of spherical harmonic analysis and power spectral analysis. The external source signal is shown to be primarily zonal in geomagnetic coordinates. Prominent peaks are present in the power spectrum at frequencies of 1.0 cycle/yr and 2.0 cycles/yr. The annual signal is largest on the degree 2 external zonal spherical harmonic, while the semiannual signal is largest on the degree 1 and degree 3 external zonal spherical harmonics. The presence of the semiannual signal on odd-degree spherical harmonics and of the annual signal on even-degree spherical harmonics was predicted from symmetry considerations and the annual cycle of solar inclination. These signals are all modulated by the sunspot frequency and its harmonics. The degree 1 term is believed to be due mainly to magnetopause and ring currents while the degree 2 and degree 3 terms are believed to be due mainly to ionospheric currents. The degree 1 external zonal harmonic has a continuous spectrum in addition to the semiannual spectral peak. A corresponding degree 1 internal term is due to electromagnetic induction. The degree 1 continuous spectrum is useful for study of the electrical conductivity of the deep mantle. A global geomagnetic response function consistent with a mantle conductivity of about 10 S/m at the core-mantle boundary has been derived. RP USN, RES LAB, MC 7442, BAY ST LOUIS, MS 39529 USA. NR 24 TC 22 Z9 22 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JUL 10 PY 1994 VL 99 IS B7 BP 13577 EP 13590 DI 10.1029/94JB00728 PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NW515 UT WOS:A1994NW51500005 ER PT J AU CALDERON, SN ROTHMAN, RB PORRECA, F FLIPPENANDERSON, JL MCNUTT, RW XU, H SMITH, LE BILSKY, EJ DAVIS, P RICE, KC AF CALDERON, SN ROTHMAN, RB PORRECA, F FLIPPENANDERSON, JL MCNUTT, RW XU, H SMITH, LE BILSKY, EJ DAVIS, P RICE, KC TI PROBES FOR NARCOTIC RECEPTOR-MEDIATED PHENOMENA .19. SYNTHESIS OF (+)-4-[(ALPHA-R)-ALPHA-((2S,5R)-4-ALLYL-2,5-DIMETHYL-1-PIPERAZINYL)-3-ME THOXYBENZYL]-N,N-DIETHYLBENZAMIDE (SNC-80) - A HIGHLY SELECTIVE, NONPEPTIDE DELTA-OPIOID RECEPTOR AGONIST SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Note ID NCX BINDING-SITES; PHARMACOLOGICAL CHARACTERIZATION; FUNCTIONAL EXPRESSION; OPIATE RECEPTOR; RAT-BRAIN; BW373U86; CLONING; SUBTYPES; PEPTIDES; ANTAGONISTS C1 NIDDKD,MED CHEM LAB,BETHESDA,MD 20892. NIDA,ADDICT RES CTR,CLIN PSYCHOPHARMACOL SECT,BALTIMORE,MD 21224. USN,RES LAB,STRUCT MATTER LAB,CODE 6030,WASHINGTON,DC 20375. UNIV ARIZONA,ARIZONA HLTH SCI CTR,DEPT PHARMACOL,TUCSON,AZ 85724. BURROUGHS WELLCOME CO,DIV ORGAN CHEM,RES TRIANGLE PK,NC 27709. NR 43 TC 174 Z9 174 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD JUL 8 PY 1994 VL 37 IS 14 BP 2125 EP 2128 DI 10.1021/jm00040a002 PG 4 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA NW321 UT WOS:A1994NW32100002 PM 8035418 ER PT J AU MUKHERJEE, AB MIELE, L PATTABIRAMAN, N AF MUKHERJEE, AB MIELE, L PATTABIRAMAN, N TI PHOSPHOLIPASE A(2) ENZYMES - REGULATION AND PHYSIOLOGICAL-ROLE SO BIOCHEMICAL PHARMACOLOGY LA English DT Editorial Material DE PHOSPHOLIPASE A(2); SIGNAL TRANSDUCTION; INFLAMMATION ID PANCREATIC-TYPE PHOSPHOLIPASE-A2; GROUP-II PHOSPHOLIPASE-A2; RAT PLATELET PHOSPHOLIPASE-A2; DEPENDENT PROTEIN-KINASE; GTP-BINDING PROTEINS; ARACHIDONIC-ACID; CYTOSOLIC PHOSPHOLIPASE-A2; STIMULATES PHOSPHOLIPASE-A2; SIGNAL-TRANSDUCTION; GENE-EXPRESSION C1 USN, RES LAB, STRUCT MATTER LAB, WASHINGTON, DC 20375 USA. NR 85 TC 182 Z9 186 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0006-2952 EI 1873-2968 J9 BIOCHEM PHARMACOL JI Biochem. Pharmacol. PD JUL 5 PY 1994 VL 48 IS 1 BP 1 EP 10 DI 10.1016/0006-2952(94)90216-X PG 10 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA NZ078 UT WOS:A1994NZ07800001 PM 8043009 ER PT J AU JOKEIT, H MAKEIG, S AF JOKEIT, H MAKEIG, S TI DIFFERENT EVENT-RELATED PATTERNS OF GAMMA-BAND POWER IN BRAIN WAVES OF FAST-READING AND SLOW-READING SUBJECTS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE 40-HZ ELECTROENCEPHALOGRAM; EVENT-RELATED POTENTIAL; REACTION TIMES; TIME-VARYING SPECTRA; EVENT-RELATED SPECTRA ID AUDITORY EVOKED-POTENTIALS; REACTION-TIME-TASK; NEURONAL OSCILLATIONS; NUCLEUS BASALIS; RHESUS-MONKEY; VISUAL-CORTEX; NORMAL HUMANS; EEG SPECTRUM; CAT; SYNCHRONIZATION AB Fast- and slow-reacting subjects exhibit different patterns of gamma-band electroencephalogram (EEG) activity when responding as quickly as possible to auditory stimuli. This result appears to confirm long standing speculations of Wundt that fast- and slow-reacting subjects produce speeded reactions in different ways and demonstrates that analysis of event-related changes in the amplitude of EEG activity recorded from the human scalp can reveal information about event-related brain processes unavailable using event-related potential measures. Time-varying spectral power in a selected (35- to 43-Hz) gamma frequency band was averaged across trials in two experimental conditions: passive listening and speeded reacting to binaural clicks, forming 40-Hz event-related spectral responses. Factor analysis of between-subject event-related spectral response differences split subjects into two near equal groups composed of faster- and slower-reacting subjects. In faster-reacting subjects, 40-Hz power peaked near 200 ms and 400 ms poststimulus in the react condition, whereas in slower-reacting subjects, 40-Hz power just before stimulus delivery was larger in the react condition. These group differences were preserved in separate averages of relatively long and short reaction-time epochs for each group. gamma-band (20-60 Hz)-filtered event related potential response averages did not differ between the two groups or conditions. Because of this and because gamma-band power in the auditory event-related potential is small compared with the EEG, the observed event-related spectral response features must represent gamma-band EEG activity reliably induced by, but not phase-locked to, experimental stimuli or events. C1 USN,HLTH RES CTR,SAN DIEGO,CA 92186. RP JOKEIT, H (reprint author), UNIV MUNICH,INST MED PSYCHOL,GOETHESTR 31,D-80336 MUNICH,GERMANY. NR 45 TC 83 Z9 85 U1 0 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 5 PY 1994 VL 91 IS 14 BP 6339 EP 6343 DI 10.1073/pnas.91.14.6339 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NV420 UT WOS:A1994NV42000021 PM 8022783 ER PT J AU SANTANGELO, PG NGAI, KL ROLAND, CM AF SANTANGELO, PG NGAI, KL ROLAND, CM TI ANOMALOUS RELAXATION IN POLYCHLORINATED BIPHENYL POLYBUTADIENE MIXTURES SO MACROMOLECULES LA English DT Article ID FREE-VOLUME INTERPRETATION; SOLVENT DYNAMICS; SEGMENTAL RELAXATION; POLYMER-SOLUTIONS; AROCLOR SOLUTIONS; FRICTION; GLASS; ANTIPLASTICIZATION; POLYBUTADIENES; POLYISOPRENE AB The phenomenon of faster relaxation of small-molecule glass-forming liquids upon addition of a higher T(g) polymer is examined for mixtures of Aroclor 1248 (PCB) with poly(vinylethylene) (PVE). In this system the anomaly can be ascribed to the positive changes in volume on mixing. Contributions to the observed behavior from changes in local friction coefficient, as deduced from the coupling model of relaxation, exert a less obvious influence. This can be contrasted with prior results on mixtures of poly(methyl-phenylsiloxane) (PMPS) with the small-molecule glass former 1,1-bis(p-methoxyphenyl)cyclohexane (BMC).1,2 Despite a similarly anomalous solvent modification, the volume change upon mixing is negative therein. This suggests that changes in local friction, as inferred from comparison of the components' noncooperative relaxation times, are a general mechanism contributing to the local dynamics in mixtures. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 36 TC 21 Z9 21 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 4 PY 1994 VL 27 IS 14 BP 3859 EP 3863 DI 10.1021/ma00092a027 PG 5 WC Polymer Science SC Polymer Science GA NW284 UT WOS:A1994NW28400027 ER PT J AU KONNERT, JH DANTONIO, P WARD, KB AF KONNERT, JH DANTONIO, P WARD, KB TI OBSERVATION OF GROWTH STEPS, SPIRAL DISLOCATIONS AND MOLECULAR PACKING ON THE SURFACE OF LYSOZYME CRYSTALS WITH THE ATOMIC-FORCE MICROSCOPE SO ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY LA English DT Article; Proceedings Paper CT 5th International Conference on the Crystallization of Biological Macromolecules (ICCBM)/National-Institute-of-Health Membrane Crystallization Workshop CY AUG 08-13, 1993 CL SAN DIEGO, CA SP NIH AB The (110) facts of lysozyme crystals in their mother liquor have been investigated using an atomic force microscope (AFM) in height mode. Crystal growth and dissolution steps, as well as simultaneous growth and dissolution in pits, have been observed. Screw dislocations were also observed but the fine structure has not yet been investigated. Images that may possess molecular resolution were obtained and compared with theoretical images based on the crystallographic structure and the effects of arbitrary tip profiles. Crystallographic periodicities of 38 and 112 angstrom were observed. A recurring feature is a centered periodic array of minima that may be associated with one of the two nearly planar sheets of molecules present in the crystal that are parallel to the (110) faces. RP KONNERT, JH (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 5 TC 85 Z9 87 U1 0 U2 4 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0907-4449 J9 ACTA CRYSTALLOGR D JI Acta Crystallogr. Sect. D-Biol. Crystallogr. PD JUL 1 PY 1994 VL 50 BP 603 EP 613 DI 10.1107/S0907444994001988 PN 4 PG 11 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics; Crystallography SC Biochemistry & Molecular Biology; Biophysics; Crystallography GA NY475 UT WOS:A1994NY47500044 PM 15299424 ER PT J AU VANDERMEER, RA JENSEN, DJ AF VANDERMEER, RA JENSEN, DJ TI MODELING MICROSTRUCTURAL EVOLUTION OF MULTIPLE TEXTURE COMPONENTS DURING RECRYSTALLIZATION SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID COMPUTER-SIMULATION; GRAIN-IMPINGEMENT; KINETICS; NUCLEATION; GROWTH; TRANSFORMATIONS; RECOVERY; METALS AB Models were formulated in an effort to characterize recrystallization in materials with multiple texture components. The models are based on a microstructural path methodology (MPM). Experimentally the microstructural evolution of conmmercial aluminum during recrystallization was characterized using stereological point and lineal measurements of microstructural properties in combination with EBSP analysis for orientation determinations. The potential of the models to describe the observed recrystallization behavior of heavily cold-rolled commercial aluminum was demonstrated. A successful MPM model was deduced which, for each texture component-random, rolling and cube orientations, was quantitatively consistent with the measured microstructural properties. Nucleation and growth rates were deduced for each texture component using the model. C1 RISO NATL LAB, DEPT MAT, DK-4000 ROSKILDE, DENMARK. RP VANDERMEER, RA (reprint author), USN, RES LAB, CODE 63201, WASHINGTON, DC 20375 USA. OI Juul Jensen, Dorte/0000-0001-5096-6602 NR 37 TC 35 Z9 35 U1 0 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUL PY 1994 VL 42 IS 7 BP 2427 EP 2436 DI 10.1016/0956-7151(94)90321-2 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NT203 UT WOS:A1994NT20300023 ER PT J AU LYBANON, M AF LYBANON, M TI SATELLITE ALTIMETRY OF THE GULF-STREAM SO AMERICAN JOURNAL OF PHYSICS LA English DT Article RP LYBANON, M (reprint author), USN,RES LAB,STENNIS SPACE CTR,REMOTE SENSING APPLICAT BRANCH,WASHINGTON,DC 20375, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD JUL PY 1994 VL 62 IS 7 BP 661 EP 665 DI 10.1119/1.17489 PG 5 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA NT931 UT WOS:A1994NT93100020 ER PT J AU KIMURA, M MAJDE, JA TOTH, LA OPP, MR KRUEGER, JM AF KIMURA, M MAJDE, JA TOTH, LA OPP, MR KRUEGER, JM TI SOMNOGENIC EFFECTS OF RABBIT AND RECOMBINANT HUMAN INTERFERONS IN RABBITS SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE FEVER; ANTIVIRAL ACTIVITY; RAPID EYE MOVEMENT SLEEP; SLEEP ID TUMOR NECROSIS FACTOR; SLOW-WAVE SLEEP; BETA-INTERFERON; ALPHA-INTERFERON; INTERLEUKIN-1 PRODUCTION; FEVER; GAMMA; MICE; SECRETION; MONOCYTES AB Interferons (IFNs) are antiviral cytokines that possess several central nervous system activities. IFN therapy is associated with sleepiness, and the IFNs expressed during viral infection may be involved in the excess sleep associated with these infections. Most viruses stimulate the production of both IFN-alpha and IFN-beta. Although large doses of human IFN-alpha(2) are somnogenic in rabbits, the effects of species-specific IFNs on sleep in the rabbit have not been documented. We compared the somnogenic and antiviral effects of IFNs derived from rabbits to the effects of recombinant human (rh) IFN-alpha and IFN-beta. When injected intracerebroventricularly, rhIFN-alpha AID, rabbit IFN-alpha/beta, and rabbit reference IFN induced non-rapid-eye-movement sleep and fever in a dose-dependent manner. However, the doses of rabbit IFNs required to induce sleep were much lower than those of human IFNs. Heat treatment of both rabbit IFNs and human IFNs greatly reduced their in vitro antiviral effects. The in vivo activities of rabbit IFNs and rhIFN-alpha AID were significantly attenuated after heat treatment. However, rhIFN-beta retained its sleep-promoting action after heat treatment, suggesting that microbial contaminants were responsible for its somnogenic and pyrogenic activities. We conclude that IFN-alpha is somnogenic. C1 UNIV TENNESSEE, DEPT PHYSIOL & BIOPHYS, MEMPHIS, TN 38163 USA. UNIV TENNESSEE, DEPT COMPARAT MED, MEMPHIS, TN 38163 USA. OFF NAVAL RES, ARLINGTON, VA 22217 USA. FU NINDS NIH HHS [NS-26429, NS-25378] NR 38 TC 27 Z9 28 U1 0 U2 1 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD JUL PY 1994 VL 267 IS 1 BP R53 EP R61 PN 2 PG 9 WC Physiology SC Physiology GA NY985 UT WOS:A1994NY98500059 PM 7519411 ER PT J AU MOORE, WJ AF MOORE, WJ TI ERRORS IN FILM REFRACTIVE-INDEX DETERMINATIONS FROM INTERFERENCE-FRINGES SO APPLIED OPTICS LA English DT Note DE REFRACTIVE INDEX; INTERFERENCE FRINGES; CHANNEL SPECTRA AB An analysis of interference fringes (channel spectra) in transmission or reflection spectroscopy of optical films can provide an accurate method for determining the refractive index or thickness of the film. If the index is changing and the common equation n = 1/(2tDELTAnu) determined from the positions of two adjacent maxima in the interference pattern is employed, the resulting refractive index does not lie between the correct values at the frequencies of the two maxima as intuitively expected but well outside this range. This error can be large and is not restricted to the previously discussed case of an index with a linear dependence on wavelength. RP MOORE, WJ (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 2 TC 6 Z9 6 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 1 PY 1994 VL 33 IS 19 BP 4164 EP 4166 PG 3 WC Optics SC Optics GA NY766 UT WOS:A1994NY76600012 PM 20935768 ER PT J AU SEELY, JF ROSENSTOCK, HB AF SEELY, JF ROSENSTOCK, HB TI NORMAL-INCIDENCE REFLECTANCE OF CRYSTALLINE K6C60, RB6C60, AND CS6C60 SO APPLIED OPTICS LA English DT Article DE X-RAY OPTICS; X-RAY DIFFRACTION; FULLERENES ID C-60; C60 AB The structure factors and normal-incidence reflectances of the alkali-metal-doped fulleride crystals M6C60 (where M = K, Rb, or Cs) were calculated, and the peak reflectances are in the 2-20% range for incident wavelengths of 9-17 angstrom, which indicates that C60 may be a promising transmissive (spacer) material for normal-incidence mirrors that have relatively high normal-incidence reflectance in the x-ray region. C1 SFA INC, LANDOVER, MD 20785 USA. RP SEELY, JF (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 13 TC 1 Z9 1 U1 0 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 1 PY 1994 VL 33 IS 19 BP 4225 EP 4229 PG 5 WC Optics SC Optics GA NY766 UT WOS:A1994NY76600021 PM 20935777 ER PT J AU KLEIN, CA MILLER, RP STIERWALT, DL AF KLEIN, CA MILLER, RP STIERWALT, DL TI SURFACE AND BULK ABSORPTION CHARACTERISTICS OF CHEMICALLY VAPOR-DEPOSITED ZINC SELENIDE IN THE INFRARED SO APPLIED OPTICS LA English DT Article DE CHEMICAL VAPOR DEPOSITION; CO2 LASER WAVELENGTH; INFRARED ABSORPTION; LATTICE DYNAMICS; LOCALIZED MODES; ZINC SELENIDE ID ZNSE AB Chemically vapor-deposited zinc selenide exhibits outstanding properties in the infrared and has been established as a prime material for transmissive optics applications. Here we Present and discuss data relating to the surface and the bulk absorption forward-looking infrared- (FLIR-) grade chemically vapor-deposited ZnSe, at wavelengths (2-20 mum) and temperatures (100-500 K) of current interest. This investigation is based on both spectral emittance measurements and infrared transmission spectroscopy performed in the context of a systems development program. Surface effects can be detected at wavelengths of up to 14 mum and usually predominate at wavelengths of less than 8 mum. Fractional surface absorptions are temperature independent from approximately 200 to 400 K and cam be fitted to a Fourier series, at wavelengths ranging from 3.5 to 13.5 mum. The bulk absorption coefficient (beta(V)) is strongly dependent on temperature as well as wavelength, but it can be approximated by a bivariate polynomial expression that yields recommended values. At wavelengths lambda less than or similar to 10 mum, beta(V) decreases with increasing temperature; it is shown that a wavelength-independent Debye-Waller factor provides a correct description of the temperature dependence, thus pointing to infrared-active localized modes. At wavelengths lambda greater than or similar to 14 mum, beta(V) increases with temperature and exhibits temperature dependencies (T1.7, T2.6) that reflect three- and four-phonon summation processes. Finally, an analysis of the temperature dependence of beta(V) at 10.6 mum demonstrates that the intrinsic lattice dynamical contribution to bulk absorption at this wavelength should be close to 4 x 10(-4) CM-1, in accord with the results of earlier laser calorimetry tests performed on exceptionally pure laser-grade chemically vapor-deposited ZnSe. C1 USN, CTR COMMAND CONTROL & OCEAN SURVEILLANCE, SAN DIEGO, CA 92152 USA. RP KLEIN, CA (reprint author), RAYTHEON CO, DIV RES, LEXINGTON, MA 02173 USA. NR 21 TC 9 Z9 10 U1 1 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 1 PY 1994 VL 33 IS 19 BP 4304 EP 4313 PG 10 WC Optics SC Optics GA NY766 UT WOS:A1994NY76600032 PM 20935788 ER PT J AU FOSTER, RS LYNE, AG SHEMAR, SL BACKER, DC AF FOSTER, RS LYNE, AG SHEMAR, SL BACKER, DC TI A 6 YEAR TIMING SOLUTION FOR PSR B1951+32 SO ASTRONOMICAL JOURNAL LA English DT Article ID FAST PULSAR; CTB80 AB Six years of pulse time-of-arrival measurements have been collected from observations of the young, fast pulsar PSR B1951+32 in the CTB 80 supernova remnant using the Jodrell Bank and Arecibo radio telescopes. The combined data allow for the determination of a phase connected solution between 1987 August 21 and 1993 September 21. This solution provides an accurate rotational ephemeris for high energy x-ray and gamma-ray observations of this source made during the six years of radio timing observations to an accuracy of better than one tenth of a pulse period (4 ms). The pulsar has an activity parameter comparable with the value seen in the Crab pulsar. C1 UNIV MANCHESTER,NUFFIELD RADIO ASTRON LABS,JODRELL BANK,MACCLESFIELD SK11 9DL,CHESHIRE,ENGLAND. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. RP FOSTER, RS (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7210,WASHINGTON,DC 20375, USA. NR 19 TC 13 Z9 13 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1994 VL 108 IS 1 BP 175 EP 178 DI 10.1086/117055 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT501 UT WOS:A1994NT50100016 ER PT J AU WALTMAN, EB FIEDLER, RL JOHNSTON, KJ GHIGO, FD AF WALTMAN, EB FIEDLER, RL JOHNSTON, KJ GHIGO, FD TI THE QUIESCENT LEVEL OF CYGNUS-X-3 AT 2.25 AND 8.3 GHZ - 1988-1992 SO ASTRONOMICAL JOURNAL LA English DT Article ID SEPTEMBER RADIO OUTBURST; X-RAY; EXPANSION; 0.35C AB We report flux densities for Cygnus X-3 at 2.25 and 8.3 GHz for 1988-1992 (2.7 and 8.1 GHz prior to 1989.75). These flux densities are presented on a scale which emphasizes the relationship between very low flux densities (<30 mJy) and the evolution of major flares in Cygnus X-3. The quiescent radio flux density of Cygnus X-3 was observed to drop from roughly 80 to 14 mJy +/- 6 mJy at 2.25 GHz and from 90 to 22 mJy +/- 9 mJy at 8.3 GHz during six pre-flare intervals from 1990 through 1992. The duration of unusually low flux density varied from three days to two months. Lower quiescent flux densities than normal (35-60 mJy) also occurred during periods of active small flaring (<1 Jy) but were not as well defined. These periods of very low flux density persist longer than the opacity which occurs for a few days after onset of the flare in the expanding synchrotron cloud model of Marscher & Brown [ApJ, 200, 719 (1975)] but may be explained by quenching of the quiescent radio emission during periods of heavy accretion prior to major radio flares [Kitamoto et al., A&A, 281, L85 (1994)]. C1 USN OBSERV,WASHINGTON,DC 20392. NATL RADIO ASTRON OBSERV,GREEN BANK,WV 24944. RP WALTMAN, EB (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7210,WASHINGTON,DC 20375, USA. NR 25 TC 53 Z9 53 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1994 VL 108 IS 1 BP 179 EP 187 DI 10.1086/117056 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT501 UT WOS:A1994NT50100017 ER EF