NASA Scientific and Technical Aerospace Reports

More documents

Recommendations

Info

20040111304 NASA Langley Research Center, Hampton, VA, USA A Parallel Prefix Algorithm for Almost Toeplitz Tridiagonal Systems Sun, Xian-He; Joslin, Ronald D.; [1995]; 29 pp.; In English Contract(s)/Grant(s): NAS1-19480; NAS1-1672; No Copyright; Avail: CASI; A03, Hardcopy A compact scheme is a discretization scheme that is advantageous in obtaining highly accurate solutions. However, the resulting systems from compact schemes are tridiagonal systems that are difficult to solve efficiently on parallel computers. Considering the almost symmetric Toeplitz structure, a parallel algorithm, simple parallel prefix (SPP), is proposed. The SPP algorithm requires less memory than the conventional LU decomposition and is efficient on parallel machines. It consists of a prefix communication pattern and AXPY operations. Both the computation and the communication can be truncated without degrading the accuracy when the system is diagonally dominant. A formal accuracy study has been conducted to provide a simple truncation formula. Experimental results have been measured on a MasPar MP-1 SIMD machine and on a Cray 2 vector machine. Experimental results show that the simple parallel prefix algorithm is a good algorithm for symmetric, almost symmetric Toeplitz tridiagonal systems and for the compact scheme on high-performance computers. Author Algorithms; Parallel Computers; Decomposition 20040111395 NASA Marshall Space Flight Center, Huntsville, AL, USA Allowables for Structural Composites Netles, Alan T.; [2004]; 2 pp.; In English; International Conference on Composites Engineering, 8-14 Aug. 2004, Hilton Head, SC, USA; No Copyright; Avail: CASI; A01, Hardcopy In order to obtain the most benefit from building a structure with composite laminates, the strength of the laminate must be known. Based on the ‘weakest link’ theory, the lower strength numbers obtained from testing are the ones to be used for design and analysis. The strength value to be used is determined by a statistical analysis of the test data, and is known as an allowable. MIL-HDBK- 17 outlines procedures to follow for determining these allowables. There are two types of statistically determined allowables, A- Basis and B-Basis. A-Basis is defined as a strength value at which only 1 in 100 specimens will fail with a 95% confidence level. B-Basis is a strength value at which only 10 in 100 specimens will fail with a 95% confidence level. As more specimens are tested a higher value of strength can be used as a valid allowable. Composites are highly process dependent and show much strength variation with environment, so it is critical to test materials and environments that are representative of hardware. Either using data obtained from a previous test series, or extrapolation to a certain temperature is highly discouraged. Author Structural Analysis; Structural Design; Laminates; High Strength; Design Analysis 20040111458 Air Force Inst. of Tech., Wright-Patterson AFB, OH Target Recognition Using Late-Time Returns from Ultra-Wideband, Short-Pulse Radar Pascoe, Kenneth J.; Jun. 2004; 316 pp.; In English; Original contains color illustrations Report No.(s): AD-A425348; AFIT/DS/ENG/04-04; No Copyright; Avail: CASI; A14, Hardcopy The goal of this research is to develop algorithms that recognize targets by exploiting properties in the late- time resonance induced by ultra-wide band radar signals. A new variant of the Matrix Pencil Method algorithm is developed that identifies complex resonant frequencies present in the scattered signal. Kalman filters are developed to represent the dynamics of the signals scattered from several target types. The Multiple Model Adaptive Estimation algorithm uses the Kalman filters to recognize targets. The target recognition algorithm is shown to be successful in the presence of noise. The performance of the new algorithms is compared to that of previously published algorithms. DTIC Algorithms; Broadband; Electromagnetic Scattering; Pulse Radar; Target Recognition 20040111535 Kestrel Inst., Palo Alto, CA E-Merge-ANT: A Toolkit to Create Run-Time Autonomous Negotiating Teams (ANT) Generators, Aggregators, and Synthesizers Fitzpatrick, Stephen; Green, Cordell; Jun. 2004; 63 pp.; In English; Original contains color illustrations Contract(s)/Grant(s): F30602-00-C-0014; DARPA ORDER-J123; Proj-J123 Report No.(s): AD-A425550; AFRL-IF-RS-TR-2004-179; No Copyright; Avail: CASI; A04, Hardcopy This project addressed the problem of the real- time management of distributed resources. It developed an abstract 263
formulation in terms of distributed constraint optimization and developed a simple anytime algorithm that was shown to be effective efficient robust and scalable to large problems. It extended the formulation and algorithm to the management of distributed sensors in a target detection and tracking application. It also developed high-level models for resource management in time-critical targeting in air campaigns and extended an existing scheduler generator tool to automatically generate executable schedulers that quickly assign aircraft and munitions to prosecute targets of opportunity while minimizing disruption to pre-planned target prosecutions. DTIC Algorithms; Autonomy; Real Time Operation; Synthesizers 20040111536 Georgia Tech Research Inst., Atlanta, GA Super-Resolution Still and Video Reconstruction from MPEG Coded Video Altunbasak, Yucel; May 31, 2004; 88 pp.; In English; Original contains color illustrations Contract(s)/Grant(s): N00014-01-1-0619 Report No.(s): AD-A425551; E-21-H52; No Copyright; Avail: CASI; A05, Hardcopy Transform coding is a popular and effective compression method for both still images and video sequences, as is evident from its widespread use in international media coding standards such as MPEG, H.263 and JPEG. The motion- compensated image (or the image itself) is divided into blocks and each block is independently transformed by a 2-D orthogonal transform to achieve energy compaction. The most commonly used transform is the discrete cosine transform (DCT). After the block transform, the transform coefficients undergo a quantization step. At low bit-rates, the DCT coefficients are coarsely quantized. This coarse quantization with independent quantization of neighboring blocks gives rise to blocking artifacts visible block boundaries. DTIC Coding; Discrete Functions; Fourier Transformation 20040111545 Boston Univ., Boston, MA Causality Constraints on the Analysis and Active Control of Structures McDaniel, J. G.; Clarke, Cory L.; Li, Xianhui; Zhao, Xianfeng; Jul. 26, 2004; 76 pp.; In English Contract(s)/Grant(s): N00014-99-1-1017 Report No.(s): AD-A425573; No Copyright; Avail: CASI; A05, Hardcopy This research has integrated the causality condition into frequency-domain analysis and control of structural vibration, acoustic scattering, and acoustic radiation. As a result of these efforts, a variety of active and passive control approaches are now physically realizable. In the time domain, causality simply requires that a system’s response cannot precede its cause. In active control problems, the causality condition further requires that one cannot use future disturbance information to determine control actuation. These conditions are more subtle in the frequency domain, where one typically interprets experimental data and constructs active and passive control approaches. In the frequency domain, the causality condition assumes the form of Hilbert transform relations between elements of the complex Fourier transform of a causal response. This research produced analytical formulations of the causality condition to enhance experimental data and to devise physically realizable control approaches in the frequency domain. Two contemporary active control approaches were used to illustrate the inclusion of causality. The research developed such formulations, and their algorithmic implementations, with a close association to experimental data and control approaches that are of contemporary importance to the Office of Naval Research. DTIC Active Control; Structural Analysis 20040111968 NASA Langley Research Center, Hampton, VA, USA Dynamic Eigenvalue/Eigenvector Tracking Using Continuous Optimization on Constraint Manifolds Dean, Edwin B.; [1988]; 11 pp.; In English; TIMS/ORSA Joint National Meeting, 24-26 Oct. 1988, Denver, CO, USA; Original contains black and white illustrations; No Copyright; Avail: CASI; A03, Hardcopy This paper demonstrates the capability to obtain and dynamically track eigenvalues and eigenvectors using continuous optimization on constraint manifolds. Author Eigenvalues; Eigenvectors; Optimization; Constraints; Manifolds (Mathematics) 264
Page 2 and 3:
NASA STI Program ... in Profile Sin
Page 4 and 5:
NASA STI Availability Information N
Page 6 and 7:
Geosciences 42 Geosciences (General
Page 8 and 9:
SCIENTIFIC AND TECHNICAL AEROSPACE
Page 10 and 11:
20040111686 Naval Surface Warfare C
Page 12 and 13:
air transport industry will also ad
Page 14 and 15:
can be a useful tool for gathering
Page 16 and 17:
Aviation related applications that
Page 18 and 19:
An efficient methodology is present
Page 20 and 21:
Fogleman. A document that took a ye
Page 22 and 23:
flux focusing lens is incorporated
Page 24 and 25:
In high speed engines, thorough tur
Page 26 and 27:
09 RESEARCH AND SUPPORT FACILITIES
Page 28 and 29:
(1/inch). The results generated for
Page 30 and 31:
13 ASTRODYNAMICS Includes powered a
Page 32 and 33:
20040120944 NASA Langley Research C
Page 34 and 35:
Orbital debris in tow-Earth orbit r
Page 36 and 37:
the current state of the art in sho
Page 38 and 39:
discharge phenomena were investigat
Page 40 and 41:
sufficiently different from GEO tha
Page 42 and 43:
need and concept of the plasma expe
Page 44 and 45:
20040111087 Science Applications In
Page 46 and 47:
pump. Recall that the prior reporte
Page 48 and 49:
of no penetration as described in S
Page 50 and 51:
presented. Finally, the possible ap
Page 52 and 53:
instrument were developed during th
Page 54 and 55:
20040111432 NASA Glenn Research Cen
Page 56 and 57:
decomposes. This approach is advant
Page 58 and 59:
high surface areas (300-600 m(sup 2
Page 60 and 61:
developed for tow level fiber. Comp
Page 62 and 63:
This paper describes a new approach
Page 64 and 65:
Page 66 and 67:
is still important, the industry’
Page 68 and 69:
engines. Epoxy reinforced with brai
Page 70 and 71:
local, intermediate, and long range
Page 72 and 73:
the effect of Cr on SCC. The alloy
Page 74 and 75:
provide data from reference wetland
Page 76 and 77:
nonparametric theory, he was able t
Page 78 and 79:
cooling cycles produced during weld
Page 80 and 81:
20040111168 California Univ., Lawre
Page 82 and 83:
chemical compositional variation, h
Page 84 and 85:
20040120859 Duquesne Univ., Pittsbu
Page 86 and 87:
27 NONMETALLIC MATERIALS Includes p
Page 88 and 89:
20040111196 Institute of Industrial
Page 90 and 91:
The National Aeronautics and Space
Page 92 and 93:
This report summarizes the findings
Page 94 and 95:
esults show that the membranes expo
Page 96 and 97:
development of a new performance-ba
Page 98 and 99:
schedule for testing was developed,
Page 100 and 101:
20040111137 Lawrence Livermore Nati
Page 102 and 103:
20040111497 Military Equipment and
Page 104 and 105:
20040120946 Cleveland State Univ.,
Page 106 and 107:
electrons up to 2 MeV, floating pot
Page 108 and 109:
Army, DARPA, MDA, Navy, NSA, and OS
Page 110 and 111:
During the two-year duration of thi
Page 112 and 113:
the design, operational and perform
Page 114 and 115:
the surfaces can be brought togethe
Page 116 and 117:
Page 118 and 119:
self-sustained due to the low Reyno
Page 120 and 121:
slot in an orientation most nearly
Page 122 and 123:
place in practice the formulated fl
Page 124 and 125:
Direct numerical simulation was use
Page 126 and 127:
Because the temperature rise on the
Page 128 and 129:
activities and both funded and non-
Page 130 and 131:
Time Stamping System, The Detection
Page 132 and 133:
and remove self-interference signal
Page 134 and 135:
An optical detector system includes
Page 136 and 137:
proliferative response of corneal t
Page 138 and 139:
The use of wind power is in a perio
Page 140 and 141:
Page 142 and 143:
In this report the implementation o
Page 144 and 145:
Page 146 and 147:
weapons systems. For reasons arisin
Page 148 and 149:
for the largest term in the series.
Page 150 and 151:
20040111153 BP Solar, Frederick, MD
Page 152 and 153:
20040112060 National Space Science
Page 154 and 155:
predicted for Alloy 22, and validat
Page 156 and 157:
pollution influence exceeds Europea
Page 158 and 159:
20040120889 Alternative Modes as an
Page 160 and 161:
considers the environment of the wh
Page 162 and 163:
GEOS-CHEM global three-dimensional
Page 164 and 165:
Our project focused on the investig
Page 166 and 167:
(FL-1016) (Salottolo 1994; Phillips
Page 168 and 169:
20040111442 Harvard Univ., Cambridg
Page 170 and 171:
20040120899 Geological Survey, Aust
Page 172 and 173:
20040111443 National Space Science
Page 174 and 175:
20040111528 Johns Hopkins Univ., Ba
Page 176 and 177:
20040111546 Texas Univ., Houston, T
Page 178 and 179:
20040111555 Baylor Coll. of Medicin
Page 180 and 181:
20040111561 McMaster Univ., Hamilto
Page 182 and 183:
Some cellular factors that contribu
Page 184 and 185:
in commercially available seaweeds
Page 186 and 187:
20040111584 State Univ. of New York
Page 188 and 189:
to a topic in or immediately applic
Page 190 and 191:
strengthens our central hypothesis
Page 192 and 193:
20040111604 Winston-Salem State Uni
Page 194 and 195:
The objective of this proposal is t
Page 196 and 197:
20040111622 Texas Univ., Houston, T
Page 198 and 199:
ole of CE-Q in initiation of prosta
Page 200 and 201:
20040111633 Jackson (Henry M.) Foun
Page 202 and 203:
that are required for DNA replicati
Page 204 and 205:
20040111649 Monash Univ., Clayton S
Page 206 and 207:
20040111658 Henry Ford Health Syste
Page 208 and 209:
and loss of heterozygosity occurs i
Page 210 and 211:
esistance is frequent, perhaps exce
Page 212 and 213:
20040111682 Burnham Inst., La Jolla
Page 214 and 215:
educators, researchers and professo
Page 216 and 217:
several similar genetic epidemiolog
Page 218 and 219:
Using a Resource-Based Theory/View
Page 220 and 221: 20040111717 Beth Israel Deaconess M
Page 222 and 223: Evidence show that TNFa is able to
Page 224 and 225: observations that cells expressing
Page 226 and 227: Early detection and intervention is
Page 228 and 229: Metastasis-suppressor genes suppres
Page 230 and 231: The objective was to produce breast
Page 232 and 233: generally convex back surface, and
Page 234 and 235: A method is presented for determini
Page 236 and 237: 20040121111 Florida International U
Page 238 and 239: of V and V and UQ at specified Conf
Page 240 and 241: 60 COMPUTER OPERATIONS AND HARDWARE
Page 242 and 243: holdings. A study released by the S
Page 244 and 245: version compatibly issues surfacing
Page 246 and 247: archive sets, application modules,
Page 248 and 249: 20040111441 Prins Maurits Lab. TNO,
Page 250 and 251: 20040111488 Industrieanlagen-Betrie
Page 252 and 253: 20040111687 Naval Research Lab., Wa
Page 254 and 255: Mass Storage Systems and Technologi
Page 256 and 257: the information exchange at the int
Page 258 and 259: 20040121022 COPAN Systems, Inc., Lo
Page 260 and 261: Performance has always come at a st
Page 262 and 263: clusters with usually small IT budg
Page 264 and 265: 20040121049 Singapore Univ., Singap
Page 266 and 267: This paper presents a dynamic techn
Page 268 and 269: Collaborative optimization is a des
Page 272 and 273: 20040112056 NASA Langley Research C
Page 274 and 275: implemented within the OPTO-22 fram
Page 276 and 277: 20040111478 Cornell Univ., Ithaca,
Page 278 and 279: An approach of dealing with cases w
Page 280 and 281: distribution of ions) with given in
Page 282 and 283: in the design and production of the
Page 284 and 285: 20040111167 Lockheed Martin Corp.,
Page 286 and 287: program with emphasis on the advanc
Page 288 and 289: calculating power generation and us
Page 290 and 291: synchrotron phase (SPD), and fast p
Page 292 and 293: 20040120918 Stanford Linear Acceler
Page 294 and 295: to probe the flaws in a laminate st
Page 296 and 297: adaptive and/or active methods of c
Page 298 and 299: 72 ATOMIC AND MOLECULAR PHYSICS Inc
Page 300 and 301: therefore was intended to establish
Page 302 and 303: Ionospheric plasma interaction effe
Page 304 and 305: sites for arc inception are triple-
Page 306 and 307: 20040120896 Georgia Inst. of Tech.,
Page 308 and 309: provide a more complete representat
Page 310 and 311: 77 PHYSICS OF ELEMENTARY PARTICLES
Page 312 and 313: In the absence, for regulatory reas
Page 314 and 315: The Mission Mauagement Mice (MMO) i
Page 316 and 317: survive extreme climates, and to pr
Page 318 and 319: 20040112007 NASA Langley Research C
Page 320 and 321:
which uses the World Wide Web and o
Page 322 and 323:
Page 324 and 325:
onset. In double Maxwellian plasmas
Page 326 and 327:
20040121010 Space Telescope Science
Page 328 and 329:
uncertainties and sets of uncertain
Page 330 and 331:
space industry toward a broader bas
Page 332 and 333:
20040111070 Instituto Superior Tecn
Page 334 and 335:
20040111412 NASA Marshall Space Fli
Page 336 and 337:
99 GENERAL Includes aeronautical, a
Page 338 and 339:
The Kirchhoff Formula for a Superso
Page 340 and 341:
The Kirchhoff Formula for a Superso
Page 342 and 343:
ARTIFICIAL INTELLIGENCE A Concurren
Page 344 and 345:
BLASIUS FLOW Effect of Far-Field Bo
Page 346 and 347:
A-10 Microlocalization and Quantita
Page 348 and 349:
CERAMIC FIBERS Ceramic Matrix Compo
Page 350 and 351:
COMMAND AND CONTROL An Enemy within
Page 352 and 353:
COMPUTERIZED SIMULATION AF-Geospace
Page 354 and 355:
CRACK PROPAGATION A Comparison of W
Page 356 and 357:
DEACTIVATION Inactivation of FGF Re
Page 358 and 359:
Metamorphosis of a Hairpin Vortex i
Page 360 and 361:
ELASTIC PROPERTIES Characterization
Page 362 and 363:
EMISSION Effects of Large-Amplitude
Page 364 and 365:
Mechanical Behaviour of Woven Graph
Page 366 and 367:
FOREIGN BODIES Foreign Object Damag
Page 368 and 369:
GRAIN SIZE High Pressure X-Ray Diff
Page 370 and 371:
Autocine and Paracrine Control of B
Page 372 and 373:
INDEPENDENT VARIABLES Linear Least
Page 374 and 375:
Identification of Novel Genes Affec
Page 376 and 377:
LOW TEMPERATURE ENVIRONMENTS Oxygen
Page 378 and 379:
Regulatory Pathways Involved in Her
Page 380 and 381:
MEDICAL PERSONNEL Correlation Betwe
Page 382 and 383:
Robotics: Military Applications for
Page 384 and 385:
NEURONS The Impact of Exercise on t
Page 386 and 387:
ORDNANCE Standardized UXO Technolog
Page 388 and 389:
PHASE SHIFT Detection of a PSK Sign
Page 390 and 391:
POLYMERIC FILMS Clear, Conductive,
Page 392 and 393:
Cost-Effective Remote Mirroring Usi
Page 394 and 395:
REGENERATORS Overview 2003 of NASA
Page 396 and 397:
SEALS (STOPPERS) Compliant Foil Sea
Page 398 and 399:
SCDM in a Distributed Environment -
Page 400 and 401:
Modeling of the Plasma Thruster Imp
Page 402 and 403:
Implementation of Higher Order Lami
Page 404 and 405:
Laser Velocimetry: The Elusive Thir
Page 406 and 407:
THORIUM Evaluation of Thorium-232 D
Page 408 and 409:
TURBULENCE MODELS A Variable Turbul
Page 410 and 411:
WAFERS Wafer-Bonded Internal Back-S
Page 412 and 413:
Abbenhuis, Oscar Simulation Interop
Page 414 and 415:
Barrie, R. L. Stress Relaxation in
Page 416 and 417:
Boykett, P. H. Fatigue Life Estimat
Page 418 and 419:
Carter, Theresa Strategic Supply -
Page 420 and 421:
Validation of NASCAP-2K Spacecraft-
Page 422 and 423:
Dichtl, Rudy Challenges in Long-Ter
Page 424 and 425:
Fattah, Nabil Abdel Developing Pass
Page 426 and 427:
Galofaro, J. T. Solar Array Arcing
Page 428 and 429:
Gundlach, R. B. Development of a Ca
Page 430 and 431:
Holdsworth, David Long-Term Steward
Page 432 and 433:
Janic, Milan An Application of the
Page 434 and 435:
Kitchenka, Julie A. Feasibility and
Page 436 and 437:
Lee, Rei GUPFS: The Global Unified
Page 438 and 439:
Mahler, Ronald P. Unified Collectio
Page 440 and 441:
Mikellides, I. G. Assessment of Hig
Page 442 and 443:
Namkung, Min Classification of Magn
Page 444 and 445:
Oun, Tae Hoon An Air Cargo Transshi
Page 446 and 447:
Polomarov, O. V. Landau Damping and
Page 448 and 449:
Ross, P. N. Atomistic Simulations o
Page 450 and 451:
Shamma, Mohammed A. Application of
Page 452 and 453:
Starr, Brett R. Aerocapture Perform
Page 454 and 455:
Modeling of the Photoelectron Sheat
Page 456 and 457:
Plasma Interactions With a Negative
Page 458 and 459:
Williams, M. F. Sludge Batch 3 Simu
Page 460:
Zhou, Feng A Design of Metadata Ser
show all

NASA Scientific and Technical Aerospace Reports

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?