Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

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schools within 5 miles of other schools”) in addition to the general case that the two point-sets are distinct. Our law holds for many real datasets, including diverse environments (geographic datasets, feature vectors from biology data, galaxy data from astronomy). In addition, we introduce the concept of the Box-Occupancy-Product-Sum (BOPS) plot, and we show that it can compute the pair-count exponent in a timely manner, reducing the run time by orders of magnitude, from quadratic to linear. Due to the pair-count exponent and our analysis (Law 1), we can achieve accurate selectivity estimates in constant time (0(1)) without the need for sampling or other expensive operations. The relative error in selectivity is about 30% with our fast BOPS method, and even better (about 10%), if we use the slower, quadratic method. DTIC Spatial Distribution; Probability Distribution Functions; Information Retrieval; Data Mining 184 66 SYSTEMS ANALYSIS AND OPERATIONS RESEARCH �� 20000063528 Army Engineer Research and Development Center, Environmental Lab., Vicksburg, MS USA Simulating Population Dynamics in an Ecosystem Context Using Coupled Eulerian-Lagrangian Hybrid Models (CEL HYBRID Models) Final Report Nestler, John M.; Goodwin, R. A.; Apr. 2000; 44p; In English Report No.(s): AD-A377014; ERDC/EL-TR-00-4; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche Management and modification of water resources (e.g., construction of instream structures, regulatory actions, operating strategies, etc.) have a profound effect on the physico-chemical environment of aquatic ecosystems and on the living resources that depend on this environment. CEL HYBRID models are a new method for coupling Eulerian and Lagrangian reference frames so that the higher trophic levels of an aquatic ecosystem, such as fish and shellfish, can be systematically and realistically simulated. The Eulerian-Lagrangian couple works as follows: the influence of aquatic organisms on water quality is evaluated by spatially averaging relevant characteristics of the organisms within a cell (an Eulerian concept), such as biomass, while the population dynamics of individual species (e.g., reproduction, recruitment, feeding, migration, and/or mortality) are modeled by treating organisms as individuals or groups of individuals (a Lagrangian concept). Water quality is often analyzed using spatially averaged cells, where each cell represents one uniform environment, with no variation in attributes within the cell. On the other hand, the population dynamics of species are often analyzed by tracking individuals, or groups of individuals, all of which are considered to reside within one spatially averaged environment. Spatially averaging characteristics, such as mass, of a group of organisms’ participation in the chemical processes of the aquatic environment, such as dissolved oxygen uptake and excretion, to be evaluated. However, species population dynamics, which determine the number of organisms in each cell, are usually modeled with a Lagrangian reference frame. CEL HYBRID models allow for the analysis of higher trophic level processes with minimal distortion and loss of information by coupling the two frames of reference and, thereby, exploiting the advantages and minimizing the disadvantages associated with each. DTIC Populations; Population Theory; Probability Theory; Ecosystems; Marine Environments; Water Management; Water Resources; Water Quality 20000064091 Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA USA Science Application Teams [2000]; 22p; In English; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche This paper discusses the science application team activities. Science Application team are: (1) Represent the diversity of NASA onboard computing of the future. (2) Drive architecture and system software requirements. (3) Demonstrate the benefit of highly capable computing onboard. (4) Study the birth of the first galaxies. (5) Study formation of stars. (6) Discusses the next generation space telescope hardware/software requirement: image processing and on-board optical calibration. Also discusses gamma ray large area space telescope; orbital thermal imaging spectrometer; solar terrestrial probe program; autonomous Mars rover;fault tolerance and errors. CASI Computer Programs; Galaxies; Gamma Rays; Imaging Spectrometers; Thermal Mapping; Architecture (Computers)
20000064099 Teledyne Brown Engineering, Huntsville, AL USA ISS Payload Operations: The Need for and Benefit of Responsive Planning Nahay, Ed, Teledyne Brown Engineering, USA; Boster, Mandee, Teledyne Brown Engineering, USA; [2000]; 7p; In English; Space OPS 2000 Symposium, 19-23 Jun. 2000, Toulouse, France Contract(s)/Grant(s): NAS8-50000; No Copyright; Avail: CASI; A02, Hardcopy; A01, Microfiche International Space Station (ISS) payload operations are controlled through implementation of a payload operations plan. This plan, which represents the defined approach to payload operations in general, can vary in terms of level of definition. The detailed plan provides the specific sequence and timing of each component of a payload’s operations. Such an approach to planning was implemented in the Spacelab program. The responsive plan provides a flexible approach to payload operations through generalization. A responsive approach to planning was implemented in the NASA/Mir Phase 1 program, and was identified as a need during the Skylab program. The current approach to ISS payload operations planning and control tends toward detailed planning, rather than responsive planning. The use of detailed plans provides for the efficient use of limited resources onboard the ISS. It restricts flexibility in payload operations, which is inconsistent with the dynamic nature of the ISS science program, and it restricts crew desires for flexibility and autonomy. Also, detailed planning is manpower intensive. The development and implementation of a responsive plan provides for a more dynamic, more accommodating, and less manpower intensive approach to planning. The science program becomes more dynamic and responsive as the plan provides flexibility to accommodate realtime science accomplishments. Communications limitations and the crew desire for flexibility and autonomy in plan implementation are readily accommodated with responsive planning. Manpower efficiencies are accomplished through a reduction in requirements collection and coordination, plan development, and maintenance. Through examples and assessments, this paper identifies the need to transition from detailed to responsive plans for ISS payload operations. Examples depict specific characteristics of the plans. Assessments identify the following: the means by which responsive plans accommodate the dynamic nature of science programs and the crew desire for flexibility; the means by which responsive plans readily accommodate ISS communications constraints; manpower efficiencies to be achieved through use of responsive plans; and the implications of responsive planning relative to resource utilization efficiency. Author International Space Station; Skylab Program; Spacelab; Payload Control; Autonomy; Flexibility 67 THEORETICAL MATHEMATICS �� 20000061916 Leiden Univ., Div. of Applied Mathematics, Netherlands About the Sharpness of the Stability Estimates in the Kreiss Matrix Theorem Spijker, M. N.; Tracogna, S.; Welfert, B. D.; May 06, 1998; 30p; In English Report No.(s): PB2000-104879; TW-98-02; No Copyright; Avail: National Technical Information Service (NTIS) No abstract available. NTIS Matrices (Mathematics); Estimating; Theorems; Numerical Stability 20000064060 Joint Inst. for Nuclear Research, Lab. of Computing Techniques and Automation, Dubna, USSR Numerical solution of the nonstationary Schroedinger equation with increased accuracy Vinitskij, S. I.; Puzynin, I. V.; Selin, A.; Dec. 31, 1998; 19p; In Russian; In English Report No.(s): DE99-607985; JINR-R-11-98-44; No Copyright; Avail: Department of Energy Information Bridge The method of Crank-Nicolson difference scheme generalization based on Magnus expansion for evolution operator of nonstationary Schroedinger equation is proposed for increasing the time approximation accuracy. The stability of received schemes is shown. Comparison between numerical and analytical solutions of the model problem (variable frequency oscillator) has been done for scheme O ((tau)(sup 4)) to demonstrate the accuracy, efficiency and adequate convergence of the scheme. NTIS Schroedinger Equation; Accuracy 185
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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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��
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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
Page 155 and 156: We investigate the compositional di
Page 157 and 158: Flight Center, USA; Moore, T. E., N
Page 159 and 160: This report presents the Applied Me
Page 161 and 162: 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
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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 197 and 198: and experimental technology, many o
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Page 215 and 216: est frame of the string. The modifi
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Page 219 and 220: A detailed study is undertaken, usi
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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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A ABERRATION, 143, 198 ABRASION, 22
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COMPRESSIBLE FLOW, 83 COMPRESSION L
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FATIGUE (MATERIALS), 50, 93, 96 FAT
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LASING, 90 LATE STARS, 224 LATITUDE
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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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