567
567
Jun 20, 2010
06/10
by
NON
texts
eye 567
favorite 0
comment 0
No Abstract Available
Topic: NASA PROGRAMS
221
221
May 6, 2010
05/10
by
Dryden, H. L
texts
eye 221
favorite 0
comment 0
No Abstract Available
Topic: NASA PROGRAMS
435
435
May 6, 2010
05/10
by
Carpenter, H. E., Jr
texts
eye 435
favorite 0
comment 0
No Abstract Available
Topic: NASA PROGRAMS
277
277
May 6, 2010
05/10
by
Matsen, F. A.; Scherr, C. W
texts
eye 277
favorite 0
comment 0
No Abstract Available
Topic: NASA PROGRAMS
167
167
Jun 17, 2010
06/10
by
NON
texts
eye 167
favorite 0
comment 0
No Abstract Available
Topics: ECONOMY, NASA PROGRAMS
808
808
Jun 19, 2010
06/10
by
NON
texts
eye 808
favorite 0
comment 0
No Abstract Available
Topics: CONFERENCES, INDUSTRIES, NASA PROGRAMS
917
917
Jun 19, 2010
06/10
by
NON
texts
eye 917
favorite 0
comment 0
No Abstract Available
Topics: LAUNCH VEHICLES, NASA PROGRAMS
497
497
Jun 2, 2011
06/11
by
Reed, Brian D
texts
eye 497
favorite 0
comment 0
On-board propulsion functions include orbit insertion, orbit maintenance, constellation maintenance, precision positioning, in-space maneuvering, de-orbiting, vehicle reaction control, planetary retro, and planetary descent/ascent. This paper discusses on-board chemical propulsion technology, including bipropellants, monopropellants, and micropropulsion. Bipropellant propulsion has focused on maximizing the performance of Earth storable propellants by using high-temperature, oxidation-resistant...
Topics: ASTRONAUTS, EDUCATION, NASA PROGRAMS
145
145
May 6, 2010
05/10
by
Bohn, L. C
texts
eye 145
favorite 0
comment 0
No Abstract Available
Topics: NASA PROGRAMS, UNITED STATES
104
104
Jun 17, 2010
06/10
by
NON
texts
eye 104
favorite 0
comment 0
No Abstract Available
Topics: CONFERENCES, NASA PROGRAMS, YOUTH
370
370
Jul 5, 2010
07/10
by
Breitwieser, R.; Morris, J. F
texts
eye 370
favorite 0
comment 0
No Abstract Available
Topics: HISTORIES, NASA PROGRAMS, MANAGEMENT PLANNING
349
349
Jun 3, 2011
06/11
by
Whiteman, D. N.; Wang, Z.; Demoz, B
texts
eye 349
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comment 0
The NASA/GSFC Scanning Raman Lidar (SRL) was stationed on Andros Island, Bahamas for the third Convection and Moisture Experiment (CAMEX 3) held in August - September, 1998 and acquired an extensive set of water vapor and cirrus cloud measurements (Whiteman et al., 2001). The cirrus data studied here have been segmented by generating mechanism. Distinct differences in the optical properties of the clouds are found when the cirrus are hurricane-induced versus thunderstom-induced. Relationships...
Topics: AUTONOMY, NASA PROGRAMS, PREDICTIONS, INSECTS, ALGEBRA
520
520
Jun 9, 2011
06/11
by
Pritchard, Jocelyn; Pappa, Richard; Buehrle, Ralph; Grosveld, Ferdinan
texts
eye 520
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comment 0
Modal testing of a vibro-acoustic test article referred to as the Aluminum Testbed Cylinder (ATC) has provided frequency response data for the development of validated numerical models of complex structures for interior noise prediction and control. The ATC is an all aluminum, ring and stringer stiffened cylinder, 12 feet in length and 4 feet in diameter. The cylinder was designed to represent typical aircraft construction. Modal tests were conducted for several different configurations of the...
Topics: MULTIDISCIPLINARY RESEARCH, MODELS, IDENTIFYING, NASA PROGRAMS
189
189
May 21, 2011
05/11
by
Kafalas, James A
texts
eye 189
favorite 0
comment 0
A crystal growth experiment to be performed on USML-1 is presented. The objective is to determine the effect of microgravity growth on dopant segregation.
Topics: NASA PROGRAMS, PROCUREMENT, CONTRACTS, FEDERAL BUDGETS
Abstracts for 3089 patents and applications for patent entered in the NASA scientific and information system for the period covering May 1969 through December 1976 are indexed by subject, inventor, source, NASA case or U.S. patent number, and accession number in the NASA system.
Topics: NASA Technical Reports Server (NTRS), INDEXES (DOCUMENTATION), NASA PROGRAMS, ABSTRACTS,...
283
283
Jul 5, 2010
07/10
by
Boyle, W. S.; Howard, B. T.; James, D. B
texts
eye 283
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comment 0
The conclusions reached from the arguments in the main body of the text are summarized here for convenience of the reader. The current situation of the support for Apollo from the unmanned program can be stated as follows: 1. Less than a satisfactory minimum of design input information will be available. 2. Little design modification data will be obtained in time. 3. Definitive design confirmation data, coupled with a very conservative Apollo design, is a requirement. 4. The main defect is a...
Topics: ALLOCATIONS, NASA PROGRAMS, UNIVERSITY PROGRAM, BUDGETING
244
244
texts
eye 244
favorite 0
comment 0
No Abstract Available
Topics: CAPE KENNEDY LAUNCH COMPLEX, NASA PROGRAMS
379
379
Jun 13, 2011
06/11
by
Hayden, Sandra C.; Sweet, Adam J.; Shulman, Set
texts
eye 379
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comment 0
The Livingstone 2 (L2) model-based diagnosis software is a reusable diagnostic tool for monitoring complex systems. In 2004, L2 was integrated with the JPL Autonomous Sciencecraft Experiment (ASE) and deployed on-board Goddard's Earth Observing One (EO-1) remote sensing satellite, to monitor and diagnose the EO-1 space science instruments and imaging sequence. This paper reports on lessons learned from this flight experiment. The goals for this experiment, including validation of minimum...
Topics: ASTROPHYSICS, DARK ENERGY, UNIVERSE, NASA PROGRAMS
1,246
1.2K
Jun 11, 2011
06/11
by
Moran, Matthew E.; Stelter, Stephan; Stelter, Manfre
texts
eye 1,246
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comment 0
A micro-scale regenerative heat exchanger has been designed, optimized and fabricated for use in a micro-Stirling device. Novel design and fabrication techniques enabled the minimization of axial heat conduction losses and pressure drop, while maximizing thermal regenerative performance. The fabricated prototype is comprised of ten separate assembled layers of alternating metal-dielectric composite. Each layer is offset to minimize conduction losses and maximize heat transfer by boundary layer...
Topics: MANAGEMENT ANALYSIS, MICROELECTRONICS, RISK, NASA PROGRAMS, RELIABILITY
264
264
May 22, 2011
05/11
by
NON
texts
eye 264
favorite 0
comment 0
Poly(arylene ether)s containing pendent ethynyl and substituted ethynyl groups and poly(arylene ether) copolymers containing pendent ethynyl and substituted ethynyl groups are readily prepared from bisphenols containing ethynyl and substituted ethynyl groups. The resulting polymers are cured up to 350 C to provide crosslinked poly(arylene ether)s with good solvent resistance, high strength and modulus.
Topics: INTELLECTUAL PROPERTY, NASA PROGRAMS, SECURITY, TECHNOLOGY TRANSFER
1,022
1.0K
Jun 15, 2011
06/11
by
Stedry, P. J.; Landel, R. F.; Shelton, H. T
texts
eye 1,022
favorite 0
comment 0
No Abstract Available
Topics: RESEARCH PROJECTS, SPACE EXPLORATION, NASA PROGRAMS, SUMMARIES
338
338
Jun 12, 2011
06/11
by
Roman, Monsi C.; Wieland, Paul O
texts
eye 338
favorite 0
comment 0
Since January 1999, the chemical the International Space Station Thermal Control System (IATCS) and microbial state of (ISS) Internal Active fluid has been monitored by analysis of samples returned to Earth. Key chemical parameters have changed over time, including a drop in pH from the specified 9.5 /- 0.5 ta = 58.4, an increase in the level of total inorganic carbon (TIC), total organic carbon (TOC) and dissolved nickel (Ni) in the fluid, and a decrease in the phosphate (PO,) level. In...
Topics: INFORMATION TRANSFER, NASA PROGRAMS, EDUCATION, BIBLIOGRAPHIES, CONFERENCES
1,264
1.3K
Jun 9, 2011
06/11
by
Banks, Bruce A.; Miller, Sharon K.; deGroh, Kim K
texts
eye 1,264
favorite 0
comment 0
Atomic oxygen is formed in the low Earth orbital environment (LEO) by photo dissociation of diatomic oxygen by short wavelength () 243 nm) solar radiation which has sufficient energy to break the 5.12 eV O2 diatomic bond in an environment where the mean free path is sufficiently long ( 108 meters) that the probability of reassociation or the formation of ozone (O3) is small. As a consequence, between the altitudes of 180 and 650 km, atomic oxygen is the most abundant species. Spacecraft impact...
Topics: DESIGN ANALYSIS, REVIEWING, NASA PROGRAMS, PROJECT MANAGEMENT
298
298
Jul 23, 2010
07/10
by
Wilbur, Paul J
texts
eye 298
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comment 0
The electron collection and emission characteristics of a simple hollow cathode contactor, an extended anode hollow cathode contactor supplied by JSC, and a ring cusp magnetic field contactor are presented and the effects of discharge power and argon or xenon expellant flowrate on these characteristics are examined. All of the contactors are shown to exhibit good electron emission performance over a wide range of discharge power and expellant type and flowrate. Good electron performance is...
Topics: DOCUMENTATION, INDEXES (DOCUMENTATION), TERMINOLOGY, NASA PROGRAMS, NOMENCLATURES
639
639
Jun 13, 2011
06/11
by
Jules, Kenol; Hrovat, Kenneth; Kelly, Eric; Reckart, Timoth
texts
eye 639
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comment 0
This summary report presents the analysis results of some of the processed acceleration data measured aboard the International Space Station during the period of November 2002 to April 2004. Two accelerometer systems were used to measure the acceleration levels for the activities that took place during Increment-6/8. However, not all of the activities during that period were analyzed in order to keep the size of the report manageable. The National Aeronautics and Space Administration sponsors...
Topics: RESEARCH, EDUCATION, NASA PROGRAMS, STUDENTS, SCHEDULES, SUMMER
349
349
texts
eye 349
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comment 0
Chronology of major nasa launchings
Topics: CHRONOLOGY, HISTORIES, LAUNCHING, NASA PROGRAMS, LAUNCHING, NASA PROGRAM
884
884
May 31, 2011
05/11
by
Blosser, M. L.; Chen, R. R.; Schmidt, I. H.; Dorsey, J. T.; Poteet, C. C.; Bird, R. K
texts
eye 884
favorite 0
comment 0
A new Adaptable, Robust, Metallic, Operable, Reusable (ARMOR) thermal protection system (TPS) concept has been designed, analyzed, and fabricated. In addition to the inherent tailorable robustness of metallic TPS, ARMOR TPS offers improved features based on lessons learned from previous metallic TPS development efforts. A specific location on a single-stage-to-orbit reusable launch vehicle was selected to develop loads and requirements needed to design prototype ARMOR TPS panels. The design...
Topics: NASA PROGRAMS, RISK, PROJECT MANAGEMENT, FAILURE, PROJECT PLANNING
357
357
May 23, 2011
05/11
by
Hung, R. J.; Long, Y. T.; Zu, G. J
texts
eye 357
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comment 0
The coupling of slosh dynamics within a partially filled rotating dewar of superfluid helium 11 with spacecraft orbital dynamics is investigated in response to the environmental disturbances of (a) lateral impulses, (b) gravity gradients and (c) g-jitter forces. The purpose of this study is to investigate how the coupling of helium 11 fluid slosh dynamics driven by three cases of environmental force with spacecraft dynamics can affect the bubble deformations and their associated fluid and...
Topics: NASA PROGRAMS, EDUCATION, INSTRUCTORS, TARGETS, SURVEYS, ATTITUDE INDICATORS
264
264
Aug 1, 2010
08/10
by
Myers, Michael H
texts
eye 264
favorite 0
comment 0
No Abstract Available
Topics: NASA PROGRAMS, PROJECT MANAGEMENT, DATA BASES, FEDERAL BUDGETS
340
340
Jul 5, 2010
07/10
by
Reese, D. E., Jr.; Wehrend, W. R., Jr
texts
eye 340
favorite 0
comment 0
No Abstract Available
Topics: NASA PROGRAMS, SPACE EXPLORATION, RESEARCH FACILITIES, ROCKET FLIGHT
341
341
Jul 12, 2010
07/10
by
Schwantes, S.; Elber, W
texts
eye 341
favorite 0
comment 0
Magnesium aluminate spinel was tested in a water environment at room temperature to establish its slow crack-growth behavior. Ring specimens with artificial flaws on the outside surface were loaded hydraulically on the inside surface. The time to failure was measured. Various precracking techniques were evaluated and multiple precracks were used to minimize the scatter in the static fatigue tests. Statistical analysis techniques were developed to determine the strength and crack velocities for...
Topics: NASA PROGRAMS, PATENT POLICY, ABSTRACTS, INVENTIONS, TECHNOLOGY UTILIZATION
3,647
3.6K
Jun 1, 2011
06/11
by
Campbell, William A., Jr.; Marriott, Richard S
texts
eye 3,647
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comment 0
Outgassing data, derived from tests at 398 K (125 C) for 24 hours in vacuum as per ASTM E 595-77, have been compiled for numerous materials for spacecraft use. The data presented are the total mass loss (TML) and the collected volatile condensable materials (CVCM). The various materials are compiled by likely usage and alphabetically.
Topics: NASA PROGRAMS, PROJECT MANAGEMENT, PRODUCT DEVELOPMENT, PERSONNEL DEVELOPMENT
308
308
Jun 12, 2011
06/11
by
Ketterle, Wolfgan
texts
eye 308
favorite 0
comment 0
Experimental methods of laser and evaporative cooling, used in the production of atomic Bose-Einstein condensates have recently been extended to realize quantum degeneracy in trapped Fermi gases. Fermi gases are a new rich system to explore the implications of Pauli exclusion on scattering properties of the system, and ultimately fermionic superfluidity. We have produced a new macroscopic quantum system, in which a degenerate Li-6 Fermi gas coexists with a large and stable Na-23 BEC. This was...
Topics: NASA PROGRAMS, EDUCATION, STUDENTS, RESEARCH PROJECTS, AEROSPACE ENGINEERING
99
99
texts
eye 99
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comment 0
This viewgraph presentation reviews NASA's efforts in Regolith simulants. This effort is in support of future lunar missions.
Topics: REGOLITH, ANALOGS, LUNAR CRUST, LUNAR ROCKS, NASA PROGRAMS
284
284
Apr 29, 2010
04/10
by
Rickman, Douglas L
texts
eye 284
favorite 0
comment 0
This viewgraph presentation reviews NASA's efforts in Regolith simulants. This effort is in support of future lunar missions.
Topics: REGOLITH, ANALOGS, LUNAR CRUST, LUNAR ROCKS, NASA PROGRAMS
Source: http://hdl.handle.net/2060/20080023785
234
234
Jul 11, 2010
07/10
by
Greeley, R
texts
eye 234
favorite 0
comment 0
To select an Apollo landing site by applying current knowledge of lunar geology to the analysis of lunar data, photographs, and maps.
Topics: DOCUMENTS, NASA PROGRAMS, CATALOGS (PUBLICATIONS), HANDBOOKS, MANUALS, PAPERS
262
262
May 29, 2011
05/11
by
Rubinstein, Rober
texts
eye 262
favorite 0
comment 0
A two-scale turbulence model is derived by averaging the two-point spectral evolution equation. In this model, the inertial range energy transfer and the dissipation rate can be unequal. The model is shown to reduce to a standard two-equation model in decaying turbulence.
Topics: EDUCATION, INSTRUCTORS, SUMMER, NASA PROGRAMS, READING, SCHOOLS, LEADERSHIP
205
205
Jun 2, 2011
06/11
by
Baker, Paul S
texts
eye 205
favorite 0
comment 0
Development work on an arrangement using ailerons and spoilers for lateral control was carried out by the Vought-Sikorsky Aircraft Division of the United Aircraft Corporation on a small commercial airplane in flight and on an airfoil in a wind tunnel. Spoiler hinge moments were reduced by aerodynamic balance. The arrangement was then built into an experimental airplane and further improvements were adopted as the result of flight and tunnel tests. The use of ailerons for lateral control with...
Topics: PRODUCTIVITY, NASA PROGRAMS, CONFERENCES, COST REDUCTION, PRODUCT DEVELOPMENT
510
510
Jun 12, 2011
06/11
by
Landis, Geoffrey A.; Kerslake, Thomas; Jenkins, Phillip P.; Scheiman, David A
texts
eye 510
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comment 0
The Martian surface environment provides peculiar challenges for the operation of solar arrays: low temperature, solar flux with a significant scattered component that varies in intensity and spectrum with the amount of suspended atmospheric dust, and the possibility of performance loss due to dust deposition on the array surface. This paper presents theoretical analyses of solar cell performance on the surface of Mars and measurements of cells under Martian conditions.
Topics: BIBLIOGRAPHIES, PATENTS, ABSTRACTS, PATENT POLICY, NASA PROGRAMS, ENGINEERING DRAWINGS
221
221
May 28, 2011
05/11
by
Decker, Arthur J
texts
eye 221
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comment 0
Finite-element-model-trained artificial neural networks can be used to process efficiently the characteristic patterns or mode shapes from electronic holograms of vibrating blades. The models used for routine design may not yet be sufficiently accurate for this application. This document discusses the creation of characteristic patterns; compares model generated and experimental characteristic patterns; and discusses the neural networks that transform the characteristic patterns into strain or...
Topics: CONFERENCES, EDUCATION, MINORITIES, AMERICAN INDIANS, NASA PROGRAMS, INSTRUCTORS, STUDENTS
229
229
Jul 25, 2010
07/10
by
Smalley, Larry L
texts
eye 229
favorite 0
comment 0
The concept of a primordial black hole fluid is introduced and its consequence for supercluster-sized (i.e., large scale voids) and the missing mass question are discussed.
Topics: NASA PROGRAMS, PROPELLERS, TURBOPROP ENGINES, AEROACOUSTICS, AERODYNAMICS, RESEARCH MANAGEMENT
317
317
Sep 20, 2010
09/10
by
Mawid, M. A.; Bulzan, D. L.; Aggarwal, S. K
texts
eye 317
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The structure and characteristics of gaseous confined laminar diffusion flames are investigated by numerically solving the time-dependent two-dimensional axisymmetric conservation equations. The numerical model accounts for the important chemical and physical processes involved, including axial diffusion, viscous effects, radial convection, and finite-rate chemistry. The numerical results clearly show that the flame has a finite thickness and leakage of fuel vapor into the flame zone is...
Topics: INFORMATION RETRIEVAL, TERMINOLOGY, THESAURI, BATCH PROCESSING, NASA PROGRAMS, TRANSLATING
274
274
May 27, 2011
05/11
by
Anderson, Bruce E.; Cofer, W. Randy, III; McDougal, David S
texts
eye 274
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comment 0
Selected results from the June 1997 Third Subsonic Assessment Near-Field Interactions Flight (SNIF-III) Experiment are documented. The primary objectives of the SNIF-III experiment were to determine the partitioning and abundance of sulfur species and to examine the formation and growth of aerosol particles in the exhaust of F-16 aircraft as a function of atmospheric and aircraft operating conditions and fuel sulfur concentration. This information is, in turn, being used to address questions...
Topics: ENGINEERING, COMPUTER TECHNIQUES, EDUCATION, UNIVERSITIES, NASA PROGRAMS, STUDENTS, LEARNING
326
326
Jul 12, 2010
07/10
by
Rosser, R. W
texts
eye 326
favorite 0
comment 0
Addition of controlled amounts of perfluorinated alkyl ether diacyl fluoride to epoxy resin systems prior to cure results in a formulation which, exhibits improved energy absorbing properties.
Topics: MANAGEMENT INFORMATION SYSTEMS, NASA PROGRAMS, UNIVERSITY PROGRAM, RESEARCH, UNIVERSITIES
323
323
Jul 6, 2010
07/10
by
Hardy, G. H
texts
eye 323
favorite 0
comment 0
An analytical pilot-vehicle study was made to determine the performance criteria for the space shuttle vehicle. Specifications for the flying qualities of piloted aircraft were used for appropriate portions of the space shuttle mission. The handling qualities during the terminal phases of the space shuttle flight were simulated to develop the necessary criteria. Additional criteria required for conditions during the unpowered approach and landing trajectory portion of the flight are explained.
Topics: GEODESY, NASA PROGRAMS, TRACKING STATIONS, SATELLITE OBSERVATION, TABLES (DATA)
1,606
1.6K
texts
eye 1,606
favorite 0
comment 0
No Abstract Available
Topics: AEROSPACE ENGINEERING, NASA PROGRAMS, ECHO PROJECT, RANGER PROJECT, TELEMETRY
291
291
Jul 5, 2010
07/10
by
Brooks, J. D.; Luoma, A. A
texts
eye 291
favorite 0
comment 0
No Abstract Available
Topics: INFORMATION DISSEMINATION, NASA PROGRAMS, TECHNOLOGY UTILIZATION, DOCUMENTATION, SYSTEMS ANALYSIS
252
252
Jul 26, 2010
07/10
by
Ng, Chung Fa
texts
eye 252
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comment 0
This design guide describes a method for predicting the random response of flat and curved plates which is based on theoretical analyses and experimental results. The plate curvature can be due to postbuckling, in-plane mechanical or thermal stresses. Based on a single mode formula, root mean square values of the strain response to broadband excitation are evaluated for different static buckled configurations using the equivalent linearization technique. The effects on the overall strain...
Topics: AEROSPACE INDUSTRY, NASA PROGRAMS, QUALITY, HUMAN RESOURCES, MANAGEMENT, TEAMS
313
313
Jul 11, 2010
07/10
by
Skuridin, G. A.; Sevastyanov, V. I.; Nazarov, G. A
texts
eye 313
favorite 1
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The stages in the development of the idea of manned flight into space are traced along with the evolution of the profession of cosmonauts who have become spacecraft test pilots and also research scientists solving many scientific, national, and economic problems.
Topics: APOLLO 12 FLIGHT, SPACE EXPLORATION, APOLLO FLIGHTS, NASA PROGRAMS
1,122
1.1K
Sep 20, 2010
09/10
by
Shelley, Richar
texts
eye 1,122
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comment 0
Auxiliary Power Unit (APU) fuel (hydrazine) tanks have had to be removed from the Columbia Shuttle (OV-102) because they have been in service for 11 years, which is the limit of their useful life. As part of an effort to determine whether the useful life of the fuel tanks can be extended, examination of the ethylene propylene rubber (EPR) diaphragm and the metal from one of the APU tanks is required. The JSC Propulsion and Power Division has requested White Sands Test Facility (WSTF) to examine...
Topics: INDEXES (DOCUMENTATION), NASA PROGRAMS, RESEARCH PROJECTS, COMMERCE, RESEARCH, TECHNOLOGIES
