Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

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sions: In the greater residential areas, the overall rating sound level does not exceed 53 dB(A). In the future this level might decrease by 1 dB. Author Sound Propagation; Guns (Ordnance); Gunfire 20010022795 Institute TNO of Applied Physics, Delft, Netherlands Literature Study on the Modelling of Target Echo Strength Final Report Giling, E. J. M., Institute TNO of Applied Physics, Netherlands; Aug. 25, 2000; 32p; In English Contract(s)/Grant(s): A97/KM/125; TNO Proj. 008.00762 Report No.(s): HAI-RPT-990015; TD-990308; Copyright; Avail: Issuing Activity In this document, the results of a literature study and software search on the numerical modelling of Target Echo Strength (also ”TES”, ”Target Strength” or ”TS”) are reported. Author Mathematical Models; Echoes; Computer Programs 262 72 ATOMIC AND MOLECULAR PHYSICS �� 20010022632 Stanford Univ., Center for Turbulence Research, Stanford, CA USA Calculating Free Energies Using Scaled-Force Molecular Dynamics Algorithm Darve, Eric, Stanford Univ., USA; Wilson, Micahel A., NASA Ames Research Center, USA; Pohorille, Andrew, NASA Ames Research Center, USA; Annual Research Briefs - 2000: Center for Turbulence Research; December 2000, pp. 3-16; In English; See also 20010022631; No Copyright; Avail: CASI; A03, Hardcopy; A03, Microfiche One common objective of molecular simulations in chemistry and biology is to calculate the free energy difference between different states of the system of interest. Examples of problems that have such an objective are calculations of receptor-ligand or protein-drug interactions, associations of molecules in response to hydrophobic, and electrostatic interactions or partition of molecules between immiscible liquids. Another common objective is to describe evolution of the system towards a low energy (possibly the global minimum energy), ’native’ state. Perhaps the best example of such a problem is folding of proteins or short RNA molecules. Both types of problems share the same difficulty. Often, different states of the system are separated by high energy barriers, which implies that transitions between these states are rare events. This, in turn, can greatly impede exploration of phase space. In some instances this can lead to ’quasi non-ergodicity’, whereby a part of phase space is inaccessible on timescales of the simulation. A host of strategies has been developed to improve efficiency of sampling the phase space. For example, some Monte Carlo techniques involve large steps which move the system between low-energy regions in phase space without the need for sampling the configurations corresponding to energy barriers (J-walking). Most strategies, however, rely on modifying probabilities of sampling low and high-energy regions in phase space such that transitions between states of interest are encouraged. Perhaps the simplest implementation of this strategy is to increase the temperature of the system. This approach was successfully used to identify denaturation pathways in several proteins, but it is clearly not applicable to protein folding. It is also not a successful method for determining free energy differences. Finally, the approach is likely to fail for systems with co-existing phases, such as water-membrane systems, because it may lead to spontaneous mixing. A similar difficulty may be encountered in any method relying on global modifications of phase space. Author Algorithms; Free Energy; Molecular Dynamics; Mathematical Models 20010026183 Oak Ridge National Lab., TN USA Neutron Total Cross Sections of U-235 From Transmission Measurements in the Energy Range 2 keV to 300 keV and Statistical Model Analysis of the Data Derrien, H.; Harvey, J. A.; Larson, N. M.; Leal, L. C.; Wright, R. Q.; May 01, 2000; 44p; In English Report No.(s): DE00-763240; ORNL/TM-2000/129; No Copyright; Avail: Department of Energy Information Bridge
The average U-235 neutron total cross sections were obtained in the energy range 2 keV to 330 keV from high-resolution transmission measurements of a 0.033 atom/b sample.1 The experimental data were corrected for the contribution of isotope impurities and for resonance self-shielding effects in the sample. The results are in very good agreement with the experimental data of Poenitz et al.4 in the energy range 40 keV to 330 keV and are the only available accurate experimental data in the energy range 2 keV to 40 keV. ENDF/B-VI evaluated data are 1.7% larger. The SAMMY/FITACS code 2 was used for a statistical model analysis of the total cross section, selected fission cross sections and data in the energy range 2 keV to 200 keV. SAMMY/FITACS is an extended version of SAMMY which allows consistent analysis of the experimental data in the resolved and unresolved resonance region. The Reich-Moore resonance parameters were obtained 3 from a SAMMY Bayesian fits of high resolution experimental neutron transmission and partial cross section data below 2.25 keV, and the corresponding average parameters and covariance data were used in the present work as input for the statistical model analysis of the high energy range of the experimental data. The result of the analysis shows that the average resonance parameters obtained from the analysis of the unresolved resonance region are consistent with those obtained in the resolved energy region. Another important result is that ENDF/B-VI capture cross section could be too small by more than 10% in the energy range 10 keV to 200 keV. NTIS Neutron Cross Sections; Uranium 235; Absorption Cross Sections 20010026194 Delaware Univ., Dept. of Physics and Astronomy, Newark, DE USA Calculations of Intermolecular Potentials Relevant for Defense Research Final Report, 1 Jul. 1997-30 Jun. 2000 Szalewicz, Krzysztof, Delaware Univ., USA; Nov. 02, 2000; 5p; In English Contract(s)/Grant(s): DAAG55-97-1-0174 Report No.(s): AD-A386147; ARO-37010.1-CH-AAS; No Copyright; Avail: CASI; A01, Microfiche; A01, Hardcopy Intermolecular forces govern many physical, chemical and biological processes. It is now possible to model such forces on computers using theoretical quantum mechanical methods developed by our group. Recent advances in computer hardware and software allow investigations of typical molecules found in explosives, propellants and solvents. The AASERT grant supported graduate students involved in this research. Their work helped to obtain state of the art potential energy hypersurfaces for various molecules relevant for the defense mission. DTIC Intermolecular Forces; Molecular Interactions; Potential Energy; Quantum Theory; Computer Programs; Molecules 73 NUCLEAR PHYSICS �� 20010026200 Oak Ridge National Lab., TN USA Cavitation in a Mercury Target West, C. D.; Sep. 01, 2000; 22p; In English Report No.(s): DE00-763224; ORNL-TM-2000-263; No Copyright; Avail: Department of Energy Information Bridge, Microfiche Recent theoretical work on the formation of bubble nucleation centers by energetic particles leads to some reasonably credible calculations of the maximum negative pressure that might be sustained without bubble formation in the mercury target of the Spallation Neutron Source. NTIS Cavitation Flow; Mercury (Metal); Bubbles; Nucleation; Energetic Particles 74 OPTICS �� 20010022973 Massachusetts Inst. of Tech., Lincoln Lab., Lexington, MA USA Experimentation and Modeling of Organic Photocontamination on Lithographic Optics Kunz, Roderick R., Massachusetts Inst. of Tech., USA; Liberman, V., Massachusetts Inst. of Tech., USA; Downs, D. K., Massachusetts 263
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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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Subject Categories of the Division
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73 Nuclear Physics 263 Includes nuc
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Document Availability Information T
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Avail: NASA Public Document Rooms.
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Hardcopy & Microfiche Prices Code N
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ALABAMA AUBURN UNIV. AT MONTGOMERY
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03 AIR TRANSPORTATION AND SAFETY
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work of the JAA had established thi
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20010024868 Federal Aviation Admini
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20010023437 Defence Science and Tec
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The Models for Aeroelastic Validati
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20010025824 Pratt and Whitney Aircr
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20010023064 NASA Langley Research C
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17 SPACE COMMUNICATIONS, SPACECRAFT
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20010026207 NASA, Washington, DC US
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The objective of the proposed resea
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20010022640 Stanford Univ., Center
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ustion, showing that these can have
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20010026184 Oak Ridge National Lab.
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film. Subsequent electroless metal
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20010024029 Houston Univ., Dept. of
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equipment indicate a change in the
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interaction, the main gas products
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Contract(s)/Grant(s): W-7405-eng-48
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for detecting and measuring deviato
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work, additional significant effect
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20010026182 Oak Ridge National Lab.
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20010024162 Army Research Lab., Ade
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matching funds. MIRSL purchased an
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20010023557 North Dakota State Univ
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20010026217 Princeton Univ., NJ USA
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20010024108 Center for Naval Analys
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undertaken to isolated it are descr
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non-buoyant axisymmetric jet issuin
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point. The other turbulent problem
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20010024042 Houston Univ., Dept. of
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The research carried out in the Hea
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along the heater surface and depart
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cal transducers. Additionally, the
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tial for its successful commercial
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This project represents a combined
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20010024910 Johns Hopkins Univ., De
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e caused by a non-uniform temperatu
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metric shear cell, employed upon th
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20010024919 Alabama Univ., Huntsvil
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Newtonian fluids in the laboratory,
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Boussinesq convection where due to
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20010024930 Creare, Inc., Hanover,
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Illumination of a space-borne objec
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The hydrodynamics near steadily mov
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to be done is the full coupled syst
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liquid crystal host. Since the ulti
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the inorganic synthesis using press
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when the buoyancy is removed, for e
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20010024956 NASA Ames Research Cent
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2.2-second drop tower at NASA Glenn
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we have examined the dynamical beha
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position of the interface. An oscil
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the first time, non-intrusive, high
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’axial curvature pressure’. A t
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moons when disturbed by low velocit
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particle size was studied. In a den
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colliding drops. The viscous resist
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20010024983 Notre Dame Univ., Physi
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20010024986 TDA Research, Inc., Whe
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drop deposition, using Schiaffino a
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and extended to reduced gravity flo
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from an isolated bubble regime to a
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20010025000 Case Western Reserve Un
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our experimental measurements and w
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sured using a hot film probe flush
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the stationary bubble entrains anot
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we have collaborated on 3D experime
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of the most attractive characterist
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apply either steady shear flow perp
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20010025024 NASA, Washington, DC US
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neously the gamma scattered method
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20010023125 Colorado Univ., Lab. fo
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Contract(s)/Grant(s): F19628-95-C-0
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ics Technology Letters; March 2000;
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The BOREAS RSS-1 team collected sur
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ically corrected; however, files of
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with wavelength bands specific to t
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20010022099 NASA Goddard Space Flig
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within the polygon). There are thre
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A03, Hardcopy; A01, Microfiche Cana
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storms in Africa and smoke plumes f
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Greenland, with the objective of qu
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The BOReal Ecosystem-Atmosphere Stu
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The BOREAS TGB-8 team collected dat
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Report No.(s): NASA/TM-2000-209891/
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The BOREAS TF-10 team collected tow
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cally Active Radiation (FPAR) absor
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tributing to the overall understand
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cal ’tour de force’ allows EPV
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20010023558 Texas Univ., Center for
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the atmospheric concentrations of m
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20010023278 Lembaga Penerbangan dan
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Atmospheric radiation in the infrar
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20010022976 Desert Research Inst.,
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The primary purpose of AASERT Grant
Page 233 and 234: with only small ice-covered areas r
Page 235 and 236: Task 2 - abstraction of Medical rec
Page 237 and 238: non-steroidal activators of the rec
Page 239 and 240: 20010023796 Massachusetts Univ. Med
Page 241 and 242: 20010024166 Chicago Univ., Chicago,
Page 243 and 244: 20010025069 Cleveland Clinic Founda
Page 245 and 246: Prior to 1994, measurement of tumor
Page 247 and 248: 20010025730 Illinois Univ., Broad o
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Page 261 and 262: 20010021985 National Inst. of Healt
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Page 277 and 278: In this report, we consider the pro
Page 279 and 280: of the neural network and hence, th
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Page 283: from the Lagrangian of the system.
Page 287 and 288: 20010026201 Sandia National Labs.,
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Page 293 and 294: 20010026247 Abdus Salam Internation
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Page 303 and 304: strates that as the gyroradius incr
Page 305 and 306: 20010023043 Jet Propulsion Lab., Ca
Page 307 and 308: climatic variations. This can only
Page 309 and 310: try), allowing the same samples, in
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Page 313 and 314: 20010023068 Tennessee Univ., Dept.
Page 315 and 316: is crucial to the successful landin
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93 SPACE RADIATION ��
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ATMOSPHERIC RADIATION, 163, 205 ATM
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DEW POINT, 165 DIAGNOSIS, 217, 220,
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GRAVITATION, 54, 84, 88, 110, 111,
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MATRIX THEORY, 270 MEASURING INSTRU
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ST-10 Q QUALITY CONTROL, 11, 213 QU
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ST-12 T TARGET RECOGNITION, 265 TAS
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A Abdelguerfi, Mahdi, 252 Abramo, R
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Cledassou, R., 311 Clemmet, J., 306
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Gorelick, N., 294 Gorevan, S. P., 4
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Kupinski, Matthew A., 256 Kuznetz,
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Parks, C. H., 249 Parr, T. P., 38 P
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Swisdak, Michael M., Jr., 37 Szalew
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Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

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