Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

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However, if taken as a percentage of the total wind speed, accuracy is better at upper levels. As expected, comparisons with the entire profile of the collocated RAOBs indicate that clear-air water vapor winds represent deeper layers than do either infrared or water vapor cloud-tracked winds. This is because in cloud-free regions the signal from water vapor features may result from emittance over a thicker layer. to further investigate characteristics of the clear-air water vapor winds, they are stratified into two categories that are dependent on the depth of the layer represented by the vector. It is found that if the vertical gradient of moisture is smooth and uniform from near the height assignment upwards, the clear-air water vapor wind tends to represent a relatively deep layer. The information from the comparisons is then used in numerical model simulations of two separate events to determine the forecast impacts. Four simulations are performed for each case: 1) A control simulation that assimilates no satellite wind data, 2) assimilation of all GOES winds according to their assigned single level height, 3) assimilation of all GOES winds spread over multiple levels, and 4) assimilation of all GOES winds spread over multiple levels, but with variations in the vertical influence of clear-air water vapor winds based on the moisture profile in the model. In the first case, a strong mid-latitude cyclone is present and the use of the satellite data results in improved storm tracks during the initial approx. 36 h forecast period. This is because the satellite data improves the analysis of the environment into which the storm progresses. Statistics for mean wind vector and height differences show that, with the exception of the height field at later times in the first case, the use of GOES winds improves the simulation with time. The simulation results suggest that it is beneficial to spread the GOES wind information over multiple levels, particularly when the moisture profile is used to define the vertical influence. Author Error Analysis; Wind Measurement; Wind Direction; Numerical Weather Forecasting; Mathematical Models 20010026230 Institute for Computer Applications in Science and Engineering, Hampton, VA USA Runge-Kutta Discontinuous Galerkin Methods for Convection-Dominated Problems Cockburn, Bernardo, Minnesota Univ., USA; Shu, Chi-Wang, Institute for Computer Applications in Science and Engineering, USA; November 2000; 82p; In English Contract(s)/Grant(s): NAS1-97046; DAAD19-00-1-0405; F49620-99-1-0077; NAG1-2070; DAAG55-97-1-0318; NSF DMS-98-07491; NSF DMS-98-04985; NSF ECS-98-04985; NSF ECS-99-06606; RTOP 505-90-52-01 Report No.(s): NASA/CR-2000-210624; NAS 1.26:210624; ICASE-2000-46; No Copyright; Avail: CASI; A05, Hardcopy; A01, Microfiche In this paper, we review the development of the Runge-Kutta discontinuous Galerkin (RKDG) methods for non-linear convection-dominated problems. These robust and accurate methods have made their way into the main stream of computational fluid dynamics and are quickly finding use in a wide variety of applications. They combine a special class of Runge-Kutta time discretizations that allows the method to be non-linearly stable regardless of its accuracy, with a finite element space discretization by discontinuous approximations, that incorporates the ideas of numerical fluxes and slope limiters coined during the remarkable development of the high-resolution finite difference and finite volume schemes. The resulting RKDG methods are stable, high-order accurate, and highly parallelizable schemes that can easily handle complicated geometries and boundary conditions. We review the theoretical and algorithmic aspects of these methods and show several applications including nonlinear conservation laws, the compressible and incompressible Navier-Stokes equations, and Hamilton-Jacobi-like equations. Author Runge-Kutta Method; Galerkin Method; Convection-Diffusion Equation; Nonlinear Equations; Finite Element Method 20010026240 Abdus Salam International Centre for Theoretical Physics, Trieste, Italy Induced representations for duals of two-parameter GL(2) deformations Dobrev, V. K.; Mihov, S. G.; Feb. 28, 1998; 11p; In English Report No.(s): DE98-621488; IC-97/163; No Copyright; Avail: Department of Energy Information Bridge We construct induced representations of the two-parameter quantum algebras U(sub p,q) and U(sub g,h) which are dual to the deformations GL(sub p,q)(2) and GL(sub g,h)(2), resp. We obtain canonically finite-dimensional representations of these algebras which can be restricted to the one-parameter three-generator subalgebras in both cases. (author). 23 refs. NTIS Algebra; Deformation 258
65 STATISTICS AND PROBABILITY �� 20010021842 California Univ., Dept. of Mathematics, Berkeley, CA USA Mathematical Problems in Imaging, Statistical Mechanics and Related Topics Final Report, 1 Apr. 1996-31 Mar. 1999 Grunbaum, F. A.; Mar. 31, 1999; 5p; In English Contract(s)/Grant(s): F49620-96-1-0127 Report No.(s): AD-A385549; AFRL-SR-BL-TR-00-0808; No Copyright; Avail: CASI; A01, Hardcopy; A01, Microfiche During the duration of this grant I did carry out work on a few loosely related areas, including diffuse tomography, the phase problem in X-ray crystallography, some relations between the Darboux process applied to orthogonal polynomials and the electrostatic interpretation of their zeros, and a number of specific problems related to the bispectral problem. This last one is an area that I initiated about a decade ago starting from a concrete problem in medical imaging. This field has made contact with several unrelated fields in mathematics, ranging from wave propagation, cumulative rings of differential operators, etc. I expect that some of these topics will continue to be of interest to the Air Force, although some of the efforts may have to be redirected. As an example I notice that my initial work on Diffuse Tomography could become of some relevance to work being done at the Air Force Research Laboratory at Kirkland AFB, in the Advanced Optics and Imaging Division by Dr. Charles Matson. DTIC Analysis (Mathematics); Mathematical Models 20010026245 Abdus Salam International Centre for Theoretical Physics, Trieste, Italy Simulation study of an asymmetric exclusion model with open and periodic boundaries Benyoussef, A.; Chakib, H.; Ez-Zahraouy, H.; Dec. 31, 1997; 13p; In English Report No.(s): DE98-621493; IC-97/203; No Copyright; Avail: Department of Energy Information Bridge Using numerical simulations we study the effect of the jumping rate on the density, current and phase diagram in the open boundaries case, and on the velocities of particles in the case of one and two species of particles on a ring, of one dimensional asymmetric exclusion model. However, on the one hand, a passage from discontinuous to continuous transition occurs by decreasing the jumping rate in the open boundaries, on the other hand, for two species of particles on a ring the velocity of particle 1 increases while the velocity of particle 2 decreases as the jumping rate increases. (author). 20 refs, 7 figs. NTIS Asymmetry; Exclusion; Simulation 66 SYSTEMS ANALYSIS AND OPERATIONS RESEARCH �� 20010021846 Naval Postgraduate School, Dept. of Operations Research, Monterey, CA USA DISC-O-TIC: A Discrete-Time Analysis Meta-Model for Use in Combat Systems Studies that Utilize High-Resolution Simulation Models Gaver, Donald P.; Jacobs, Patricia A.; Nov. 2000; 63p; In English Contract(s)/Grant(s): MIPR-DJAM00109 Report No.(s): AD-A385447; NPS-OR-01-005; No Copyright; Avail: CASI; A01, Microfiche; A04, Hardcopy This paper provides various meta-models for extending or extrapolating in time, and varying and enhancing in coverage capability, the 2-day output of a high-resolution simulation model, here specifically but not exclusively, the Army’s COSAGE. The models we propose, generically called DISC-O-TIC, (Discrete-Time Analytical Meta Model) are tailored to employ the discretetime output of COSAGE and, potentially, many other such models. The model parameters are estimated from data available from a high-resolution simulation model; in the case of COSAGE the killer/victim scoreboards are used. The models are used to compute/estimate, in spread-sheet format, future force sizes and compositions that result from mutual attrition, as well as ammunition expenditures. Meta-model examination can and is shown to reveal apparent anomalies in data. Meta-models that reflect environmental variations and adaptable firing (ATCAL-like) firing rates illustrate those effects for long (8-day) battles. DTIC Mathematical Models; High Resolution; Computerized Simulation 259
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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
Page 229 and 230: 20010022976 Desert Research Inst.,
Page 231 and 232: 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
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Page 239 and 240: 20010023796 Massachusetts Univ. Med
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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 277 and 278: In this report, we consider the pro
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Page 291 and 292: 77 PHYSICS OF ELEMENTARY PARTICLES
Page 293 and 294: 20010026247 Abdus Salam Internation
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Page 303 and 304: strates that as the gyroradius incr
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Page 307 and 308: climatic variations. This can only
Page 309 and 310: try), allowing the same samples, in
Page 311 and 312: This work will describe the Thermal
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Page 315 and 316: is crucial to the successful landin
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20010023133 Jet Propulsion Lab., Ca
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spectral studies to the field, and
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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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