Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

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sistent in some respects. For clarification, further measurements have been made at the completely new designed EPoS II spectrometer. Reproducibility of the lines is possible at a high level of statistical significance. NTIS Ionic Collisions; Pair Production; Atomic Physics 20000062713 Gesellschaft fuer Schwerionenforschung m.b.H., Darmstadt, Germany Quest for narrow e(sup +)e(sup -) cumulative energy distributions heavy ion collisions. The GSI e(sup +)e(sup -) puzzle Ganz, R.; Dec. 31, 1995; 136p; In German; In English Report No.(s): DE99-715793; GSI-95-11; No Copyright; Avail: Department of Energy Information Bridge The examination of electron-positron pairs which are emitted in heavy-ion collisions at the Coulomb barrier was continued with the newly designed EPoS II spectrometer at the UNILAC accelerator. The objective of the experiments was to further analyse the narrow line structures in the positron-electron cumulative energy distributions, which were observed in preceding measurements examining the collision systems U 238 + Th 232 and U 238 + Ta181 with the EPOS I spectrometer. by means of a reproduction experiment, the existence of the lines was statistically verified relying on a large data pool. NTIS Ionic Collisions; Energy Distribution; Atomic Physics 20000062716 Joint Inst. for Nuclear Research, Lab. of Particle Physics, Dubna, USSR Resonance Bremsstrahlung of a fast charged particle in a medium Beshtoev, K.; Dec. 31, 1998; 15p; In English Report No.(s): DE99-607973; JINR-E-2-98-23; No Copyright; Avail: Department of Energy Information Bridge The Bremsstrahlung of the fast charged particle in the medium with dielectric permittivity (epsilon) at velocities (upsilon) (>=) c/n n(sup 2) =Re(epsilon) is considered. The Bremsstrahlung has singularity at (beta) = 1/ncos(theta) (beta) = (upsilon)/c, (theta) is an angle of the Bremsstrahlung. This Bremsstrahlung is interpreted as resonance Bremsstrahlung with the width characterized by Im(epsilon)=(epsilon)(sub 2), and the less (epsilon)(sub 2) is, the higher the peak of this resonance rises. The angular distribution of the Bremsstrahlung is determined by cos (theta)=1/n(beta) and this angle coincides with the angle of the Cherenkov radiation. At (beta)=1/n this resonance Bremsstrahlung goes in the forward direction and depends on frequency (omega) (epsilon)=(epsilon) (omega). NTIS Bremsstrahlung; Charged Particles; Resonance 20000062722 Joint Inst. for Nuclear Research, Flerov Lab. of Nuclear Reactions, Dubna, USSR Considerations of nuclear objects stability Shchegolev, V.; Dec. 31, 1998; 19p; In Russian; In English Report No.(s): DE99-607964; JINR-D-4-98-34; No Copyright; Avail: Department of Energy Information Bridge A new concept of the stability of nuclear objects based on the geometrical representation of states of identical particles forming shells is given. This representation is based on the following principle: the whole is stable, if it is made of the greatest possible number of elements, each being different from another. As a result, the known magic numbers are calculated by a simple method. NTIS Stability; Matter (Physics); Atomic Physics 20000064056 Joint Inst. for Nuclear Research, Lab. of High Energies, Dubna, USSR Description of (pi)(sup -) -meson and proton characteristics in np- interactions at P(sub n) = 1.25 - 5.1 GeV/c within the framework of FRITIOF model Gankhuyag, B.; Dec. 31, 1998; 20p; In Russian; In English Report No.(s): DE99-607990; JINR-R-2-98-26; No Copyright; Avail: Department of Energy Information Bridge Rapidity and transverse momentum distributions of (pi)(sup -) - mesons and protons in np-interactions at 1.25 - 5.1 GeV/c in the framework of FRITIOF model are analyzed. Due to fitting of the model parameters a complex description of np-interactions has been reached. In the modified model the charge-exchange between colliding nucleons is taken into account: the transverse momentum which the colliding nucleons are exchanged by is chosen and the minimum mass of excited hadrons is supposed to be 1.2 GeV; in case of two- particle decays, a string with a mass less than 1.7 GeV, an isotropic particle decay is simulated in the 192
est frame of the string. The modified model can be used both for a description of different processes and for an analysis of nucleusnucleus interactions at intermediate energies. NTIS Mesons; Protons; Nuclear Interactions; Transverse Momentum 20000064067 NASA Ames Research Center, Moffett Field, CA USA Structure of Co(H2)n + Clusters, for n = 1-6 Bauschlicher, Charles W., Jr., NASA Ames Research Center, USA; Maitre, Philippe, California Univ., USA; Journal of Physical Chemistry; 1995; ISSN 0022-3654; Volume 99, pp. 3444-3447; In English; Copyright; Avail: Issuing Activity The geometries and H2 binding energies have been determined for Co(H2)n (sup +), for n = 1-6. The binding energies are in good agreement with experiment. The shape of the clusters is used to explain the pairwise decrease in the binding energies. The bonding in CoH2 (sup +) and Co(H2)2 (sup +) is very similar and is enhanced by sd (sigma) hybridization. The next two H2 molecules add to the side of Co(H2)2 (sup +). These two additional H2 molecules cannot benefit from sd (sigma) hybridization and are less strongly bound. The addition of the fifth and sixth H2 molecules eliminates sd (sigma) hybridization as a mechanism for reducing Co-H2 repulsion. This coupled with the smaller Co to H2 (sigma *) donation results in another decrease in the binding energies. Author Hydrogen; Cobalt; Chemical Bonds; Molecular Clusters; Hybrid Structures 20000064084 NASA Ames Research Center, Moffett Field, CA USA Theoretical Study of Electron Scattering by Small Clusters and Adsorbates Huo, Winifred M., NASA Ames Research Center, USA; Sheehy, J. A., Eloret Corp., USA; Electron Collisions with Molecules, Clusters, and Surfaces; [1994], pp. 171-182; In English; Copyright; Avail: Issuing Activity Current interest in clusters stems from their role as novel materials as well as a possible extension of cluster results to bulk systems. Experimental investigations on clusters have been carried out using laser spectroscopy, microwave spectroscopy, heavyparticle collisions, as well as electron collisions with earlier experimental work on electron attachment and ionization having been reviewed previously. Recently, Mark and coworkers studied the decay channels of cluster ions following electron impact ionization. Rauth et al. reported the formation of the superhalogen ion SF7(-) and other nonstoichiometric cluster ions in their study of electron attachment to SF6 clusters. Kresin et al. measured the absolute electron-impact depletion cross section of metal clusters Na8, Na(20), and Na(40). They found that the inelastic scattering cross section increased with cluster size and was considerably greater than the hard sphere collision cross sections. They hypothesized that electron attachment and collision-induced fragmentation were the dominant physical processes responsible for this effect. For the two smaller clusters, they also found a sharp increase in the cross section near threshold. Most theoretical studies of clusters have been devoted to their electronic structures, vibrational relaxation, and predissociation while investigations of electron scattering from clusters has been lacking. In view of this, we recently undertook an ab initio study of electron scattering from small Be clusters and BeCO. Beryllium was chosen because it is readily amenable to ab t’nitio calculations. Moreover, the electronic structure of Be clusters has been studied extensively, showing that the Be-Be bond is relatively weak in comparison with a normal chemical bond. Our investigation focuses on how the cross sections change with cluster size and geometry. The range of energy studied, 0.05 - 5.0 eV, is chosen because of the ubiquitous resonance in the low-energy scattering of Be. Hence it can be determined if it is possible, as a consequence of the weaker bonds in the Be clusters, to identify the atomic origin of the cluster resonance. Derived from text Numerical Analysis; Electron Scattering; Adsorption; Atomic Clusters; Electronic Structure; Inelastic Scattering; Ionization; Scattering Cross Sections 20000065647 Joint Inst. for Nuclear Research, Frank Lab. of Neutron Physics, Dubna, USSR Search for low-energy upscattering of ultracold neutrons from a beryllium surface Muzychka, A.; Pokotilovskij, Y.; Geltenbort, P.; Dec. 31, 1998; 20p; In English Report No.(s): DE99-607982; JINR-E-3-98-41; No Copyright; Avail: Department of Energy Information Bridge The results are presented of the search for the anomalous low energy upscattering of ultracold neutrons from beryllium surface. This upscatterring is considered as one of the possible reasons of UCN ’disappearance’ from very cold beryllium bottles, observed in experiments. The Indium foil activation method was used to measure a very low intensity flux of upscattered UCN. The (15-250) m/s velocity interval of upscattered UCN is excluded in these measurements with CL 90%. NTIS Inelastic Scattering; Cold Neutrons; Nuclear Physics 193
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Scientific and Technical Aerospace
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Introduction Scientific and Technic
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Subject Divisions Table of Contents
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ground equipment and systems. For a
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Subject Categories of the Division
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48 Oceanography 139 Includes the ph
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72 Atomic and Molecular Physics 191
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Document Availability Information T
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Avail: NASA Public Document Rooms.
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NASA CASI Price Tables — Effectiv
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ALABAMA AUBURN UNIV. AT MONTGOMERY
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20000061433 Pisa Univ., Dipartiment
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English; 34th; 34th Thermophysics C
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ciency of the generated derivative
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20000063509 NASA Glenn Research Cen
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05 AIRCRAFT DESIGN, TESTING AND PER
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A long tradition of aerodynamic des
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sonic and transonic cases will be p
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20000061449 British Aerospace Publi
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20000064593 NASA Langley Research C
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performance required for a proposed
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ment cost and create better product
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tion (NPSS), is focused on the inte
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surface measurement techniques used
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with emphasis on the search for lin
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20000063520 NASA Kennedy Space Cent
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primary issues for it’s adaptatio
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Footage shows the night vertical ta
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20000067665 NASA Kennedy Space Cent
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necessary for ignition modeling, or
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engine lifetime, and high power ope
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24 COMPOSITE MATERIALS ��
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ments. For the screening of liner m
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formation of a neutral, fluorescent
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20000065655 Ames Lab., IA USA Funda
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This is a second Triennial Conferen
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of completely charged PSSNa solutio
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20000064100 NASA Langley Research C
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Spacecraft in low Earth orbit (LEO)
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Pressure gradients, i.e. pressure h
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agreed that the NO(sub x) levels co
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tectural approach to extending the
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20000064078 Physics and Electronics
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20000064925 Institute for Human Fac
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20000066607 Institute for Human Fac
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20000062455 National Inst. of Stand
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Added Analysis (Risk Reduction); 6)
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shipboard electrical power generati
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20000067664 Jet Propulsion Lab., Ca
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other, The theoretical framework go
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figures compare the lift and pitchi
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ment phase demonstrate desired feat
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esolution mode with resolving power
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to track 1% or 0.5% changes was hig
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20000067643 NASA Marshall Space Fli
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37 MECHANICAL ENGINEERING ��
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solver based on overset grid techno
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20000067659 NASA Marshall Space Fli
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20000064621 Rensselaer Polytechnic
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that for a specific example of a be
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km x 1000 km). As with the nearly c
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20000064527 Analytical Imaging and
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20000064533 Austin State Univ., Dep
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20000064539 California Univ., Inst.
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in Yellowstone National Park. We ar
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terns of community hysteresis based
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tion model (DEM) fitting to the sca
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The Carolina slate belt is a 10- to
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20000063373 Los Alamos National Lab
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20000064912 New Energy and Industri
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and discusses the issues and resear
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The objective of this study was to
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distributions with engine test resu
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7.6, while the 1926 events appear t
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We investigate the compositional di
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Flight Center, USA; Moore, T. E., N
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This report presents the Applied Me
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in Goa, India, by 3 - 4 days. Wind
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Page 169 and 170: during 50% (SD 4%) of the breathing
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Page 173 and 174: The analysis of this smaller data s
Page 175 and 176: vided a functional helmet mount. Th
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Page 179 and 180: The goal of multi-image classificat
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Page 183 and 184: 85 dB amplifier design evolved by o
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Page 189 and 190: declarations with a pattern recogni
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Page 213: important conclusion is that for su
Page 217 and 218: isotopes. The method and program we
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Page 239 and 240: ecoming almost too cumbersome to be
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Page 243 and 244: with WFPC2 data. Tests of HSTphot
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Page 249 and 250: gas, show variations that have rema
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Page 257 and 258: A ABERRATION, 143, 198 ABRASION, 22
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PATCH ANTENNAS, 74 PATHOLOGY, 98 PA
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SPACE PLATFORMS, 38 SPACE PROBES, 2
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WIND PROFILES, 137 WIND TUNNEL TEST
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Brown, Andy, 38 Brown, April S., 20
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Grosvenor, C. A., 70 Grosvenor, J.
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Lu, Gui-Ying, 50 Lugg, Desmond J.,
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Robertson, Tony, 39 Robinson, Jeffr
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Warner, J. D., 63 Warren, James, 16
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Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

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