602
602
May 6, 2010
05/10
by
Fessler, T. E.; Need, J. L
texts
eye 602
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Fortran ii program for analysis of radioactive decay curves
Topics: APPLICATIONS PROGRAMS (COMPUTERS), COMPUTATION, CONVERGENCE, FORTRAN, ITERATION, RADIOACTIVE DECAY
179
179
Jun 12, 2011
06/11
by
Hutzler, G.; Klaudel, H.; Wang, D. Y
texts
eye 179
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The design of reactive systems must comply with logical correctness (the system does what it is supposed to do) and timeliness (the system has to satisfy a set of temporal constraints) criteria. In this paper, we propose a global approach for the design of adaptive reactive systems, i.e., systems that dynamically adapt their architecture depending on the context. We use the timed automata formalism for the design of the agents' behavior. This allows evaluating beforehand the properties of the...
Topics: RISK, ASSESSMENTS, INFORMATION MANAGEMENT, APPLICATIONS PROGRAMS (COMPUTERS), SAFETY, SUBJECTS,...
2,483
2.5K
May 6, 2010
05/10
by
Lee, C. C
texts
eye 2,483
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Fortran program for design of pure external and internal-external expansion plug nozzles
Topics: APPLICATIONS PROGRAMS (COMPUTERS), FORTRAN, NOZZLE DESIGN, PLUG NOZZLES, FORTRAN, NOZZLE
604
604
Jun 9, 2011
06/11
by
Flamm, Jeffrey D
texts
eye 604
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A static experimental investigation of a counterflow thrust vectoring nozzle concept was performed. The study was conducted in the NASA Langley Research Center Jet Exit Test Facility. Internal performance characteristics were defined over a nozzle pressure ratio (jet total to ambient) range of 3.5 to 10.0. The effects of suction collar geometry and suction slot height on nozzle performance were examined. In the counterflow concept, thrust vectoring is achieved by applying a vacuum to a slot...
Topics: AEROELASTICITY, APPLICATIONS PROGRAMS (COMPUTERS), SUPERSONIC TRANSPORTS, MODULARITY, COMPUTER...
704
704
May 23, 2011
05/11
by
Girimaji, Sharat
texts
eye 704
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The second ICASE/LaRC Industry Roundtable was held October 7-9, 1996 at the Williamsburg Hospitality House, Williamsburg, Virginia. Like the first roundtable in 1994, this meeting had two objectives: (1) to expose ICASE and LaRC scientists to industrial research agendas; and (2) to acquaint industry with the capabilities and technology available at ICASE, LaRC and academic partners of ICASE. Nineteen sessions were held in three parallel tracks. Of the 170 participants, over one third were...
Topics: MIE SCATTERING, FORTRAN, COEFFICIENTS, ALGORITHMS, APPLICATIONS PROGRAMS (COMPUTERS), RESONANCE,...
308
308
Jun 12, 2011
06/11
by
Raffarin, Mariann
texts
eye 308
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This article deals with an auction mechanism for airspace slots, as a means of solving the European airspace congestion problem. A disequilibrium, between Air Traffic Control (ATC) services supply and ATC services demand are at the origin of almost one fourth of delays in the air transport industry in Europe. In order to tackle this congestion problem, we suggest modifying both pricing and allocation of ATC services, by setting up an auction mechanism. Objects of the auction will be the right...
Topics: SOFTWARE ENGINEERING, ARCHITECTURE (COMPUTERS), SOFTWARE DEVELOPMENT TOOLS, APPLICATIONS PROGRAMS...
338
338
May 31, 2011
05/11
by
Bull, Barton; Diehl, James; Montenbruck, Oliver; Markgraf, Marku
texts
eye 338
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In preparation for the European Space Agency Maxus-4 mission, a sounding rocket test flight was carried out at Esrange, near Kiruna, Sweden on February 19, 2001 to validate existing ground facilities and range safety installations. Due to the absence of a dedicated scientific payload, the flight offered the opportunity to test multiple GPS receivers and assess their performance for the tracking of sounding rockets. The receivers included an Ashtech G12 HDMA receiver, a BAE (Canadian Marconi)...
Topics: PRODUCT DEVELOPMENT, SOFTWARE ENGINEERING, APPLICATIONS PROGRAMS (COMPUTERS), QUALITY CONTROL,...
500
500
Jun 1, 2010
06/10
by
Auer, B. M.; Saule, A. V
texts
eye 500
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comment 0
Fortran program for sensible-heat space radiator design
Topics: APPLICATIONS PROGRAMS (COMPUTERS), COMPUTER PROGRAMS, FORTRAN, SPACECRAFT RADIATORS, FORTRAN, SPACE...
223
223
Sep 20, 2010
09/10
by
NON
texts
eye 223
favorite 0
comment 0
An interferometer includes a first optical fiber coupled to a second optical fiber by fusing. At a fused portion, the first and second optical fibers are cut to expose respective cores. The cut or fused end of the first and second optical fibers is arranged to oppose a diaphragm or surface against which a physical phenomenon such as pressure or stress, is applied. In a first embodiment, a source light which is generally single-mode monochromatic, coherent light, is input to the first optical...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), TRAVEL, USER MANUALS (COMPUTER PROGRAMS), DATA MANAGEMENT,...
394
394
Jun 2, 2011
06/11
by
Giardino, Marco J.; Thomas, Michael R
texts
eye 394
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comment 0
The use of remotely sensed images is not new to archaeology. Ever since balloons and airplanes first flew cameras over archaeological sites, researchers have taken advantage of the elevated observation platforms to understand sites better. When viewed from above, crop marks, soil anomalies and buried features revealed new information that was not readily visible from ground level. Since 1974 and initially under the leadership of Dr. Tom Sever, NASA's Stennis Space Center, located on the...
Topics: SATELLITE IMAGERY, APPLICATIONS PROGRAMS (COMPUTERS), INTERNET RESOURCES, SPACE COMMERCIALIZATION,...
56
56
Nov 9, 2009
11/09
by
Burns, Patrick (Patrick J.)
texts
eye 56
favorite 0
comment 0
"Covers through Quattro Pro version 1.01"--Spine
Topics: Quattro pro, Business, APPLICATIONS PROGRAMS (COMPUTERS), DATA PROCESSING, COMPUTER PROGRAMS,...
294
294
Jun 2, 2011
06/11
by
Brat, Guillaume; Giannakopoulou, Dimitra; Goldberg, Allen; Havelund, Klaus; Lowry, Mike; Pasareanu, Corina; Venet, Arnaud; Visser, Wille
texts
eye 294
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To achieve its science objectives in deep space exploration, NASA has a need for science platform vehicles to autonomously make control decisions in a time frame that excludes intervention from Earth-based controllers. Round-trip light-time is one significant factor motivating autonomy capability, another factor is the need to reduce ground support operations cost. An unsolved problem potentially impeding the adoption of autonomy capability is the verification and validation of such software...
Topics: ARITHMETIC, SIMPLIFICATION, THEOREM PROVING, APPROXIMATION, ARCHITECTURE (COMPUTERS), APPLICATIONS...
365
365
May 29, 2011
05/11
by
Liu, Tianshu; Barrows, D. A.; Burner, A. W.; Rhew, R. D
texts
eye 365
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comment 0
This paper describes a videogram metric technique for determining aerodynamic loads based on optical elastic deformation measurements. The data reduction methods are developed to extract the normal force and pitching moment from beam deformation data. The axial force is obtained by measuring the axial translational motion of a movable shaft in a spring/bearing device. Proof-of-concept calibration experiments are conducted to assess the accuracy of this optical technique.
Topics: HYDROLOGY, ECOSYSTEMS, ATMOSPHERIC PHYSICS, CARBON, WATER, DIGITAL DATA, TOPOGRAPHY, CONTOURS,...
305
305
May 31, 2011
05/11
by
Crooker, Nanc
texts
eye 305
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comment 0
In this final technical report on research funded by a NASA grant, a project overview is given by way of summaries on nine published papers. Research has included: 1) Using suprathermal electron data to study heliospheric magnetic structures; 2) Analysis of magnetic clouds, coronal mass ejections (CME), and the heliospheric current sheet (HCS); 3) Analysis of the corotating interaction region (CIR) which develop from interactions between solar wind streams of different velocities; 4) Use of...
Topics: ALGORITHMS, COMPUTATION, DATA PROCESSING, COMPUTER TECHNIQUES, READING, COMPUTER STORAGE DEVICES,...
245
245
May 28, 2011
05/11
by
NON
texts
eye 245
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A micromechanical oscillating mass balance and method adapted for measuring minute quantities of material deposited at a selected location, such as during a vapor deposition process. The invention comprises a vibratory composite beam which includes a dielectric layer sandwiched between two conductive layers.The beam is positioned in a magnetic field. An alternating current passes through one conductive layers, the beam oscillates, inducing an output current in the second conductive layer, which...
Topics: AIR TRANSPORTATION, CONFERENCES, OPERATING SYSTEMS (COMPUTERS), UNIVERSITIES, POLICIES,...
504
504
May 30, 2010
05/10
by
Hust, J. G
texts
eye 504
favorite 1
comment 0
Two Fortran II subroutine for calculation of thermodynamic properties of oxygen using density and pressure or enthalpy and pressure as independent coordinates
Topics: APPLICATIONS PROGRAMS (COMPUTERS), THERMODYNAMIC PROPERTY, COORDINATES, ENTHALPY, FORTRAN, OXYGEN,...
This document outlines the schedule plan for the Integrated Advanced Microwave Sounding Unit-A (AMSU-A).
Topics: NASA Technical Reports Server (NTRS), MICROWAVE SOUNDING, APPLICATIONS PROGRAMS (COMPUTERS),...
255
255
May 31, 2011
05/11
by
Luo, Li-Shi; Qi, Dewei; Wang, Lian-Pin
texts
eye 255
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We briefly review the method of the lattice Boltzmann equation (LBE). We show the three-dimensional LBE simulation results for a non-spherical particle in Couette flow and 16 particles in sedimentation in fluid. We compare the LBE simulation of the three-dimensional homogeneous isotropic turbulence flow in a periodic cubic box of the size 1283 with the pseudo-spectral simulation, and find that the two results agree well with each other but the LBE method is more dissipative than the...
Topics: DATA MINING, APPLICATIONS PROGRAMS (COMPUTERS), COMPUTATIONAL GRIDS, INFORMATION RETRIEVAL,...
202
202
Jun 13, 2011
06/11
by
Petre, Robert; Lehan, John; O'Dell, Stephen; Owens, Scott; Reid, Paul B.; Saha, Timo; Stewart, Jeff; Jones, William D.; Zhang, Willia
texts
eye 202
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The Constellation-X Spectroscopy X-ray Telescope (SXT) is a large diameter, high throughput, grazing incidence imaging mirror system, designed to perform high sensitivity spectroscopy of cosmic X-ray sources in the 0.2-10.0 keV band. The baseline effective area requirement is -3 m# at 1 keV. The system-level angular-resolution requirement is a 15-arcseconds half-power diameter, with a 5-arcsecond goal. The effective area is attained through a modular design, involving the nesting of many...
Topics: SYSTEMS ANALYSIS, APPLICATIONS PROGRAMS (COMPUTERS), COMMERCIAL OFF-THE-SHELF PRODUCTS, COMPUTER...
867
867
Jul 21, 2010
07/10
by
Berry, Fred A., Jr
texts
eye 867
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comment 0
A Commodore VIC-20 computer has been interfaced with a stepper motor to provide an inexpensive stepper motor controller. Only eight transistors and two integrated circuits compose the interface. The software controls the parallel interface of the computer and provides the four phase drive signals for the motor. Optical sensors control the zeroing of the 12-inch turntable positioned by the controller. The computer calculates the position information and movement of the table and may be...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), DATA MANAGEMENT, DATA PROCESSING, FLIGHT TESTS, FORTRAN, GRAPHS...
286
286
Jun 9, 2011
06/11
by
Zaman, K. B. M. Q
texts
eye 286
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This report is a documentation of the results on flowfield surveys for the GE/ARL mixer-ejector nozzle carried out in an open jet facility at NASA Glenn Research Center. The results reported are for cold (unheated) flow without any surrounding co-flowing stream. Distributions of streamwise vorticity as well as turbulent stresses, obtained by hot-wire anemometry, are presented for a low subsonic condition. Pitot probe survey results are presented for nozzle pressure ratios up to 3.5. Flowfields...
Topics: ACTIVE CONTROL, AERODYNAMIC CHARACTERISTICS, FLOW DISTRIBUTION, SAFETY, MANEUVERS, APPLICATIONS...
Model quality and consistency has been an issue for us due to the diverse experience level and imaginative modeling techniques of our users. Fortunately, setting up ModelCHECK and Gatekeeper to enforce our best practices has helped greatly, but it wasn't easy. There were many challenges associated with setting up ModelCHECK and Gatekeeper including: limited documentation, restrictions within ModelCHECK, and resistance from end users. However, we consider ours a success story. In this...
Topics: NASA Technical Reports Server (NTRS), MODELS, PROVING, APPLICATIONS PROGRAMS (COMPUTERS), PROGRAM...
176
176
Jun 2, 2011
06/11
by
Kaiser, Mary K
texts
eye 176
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comment 0
The new research vehicle sited at Moses Lake Airport in central Washington doesn't look like it has much in common with the conceptual drawings for the next-generation supersonic airliner, the High-Speed Civil Transport (HSCT). In fact, the Surface Operations Research and Evaluation Vehicle (SOREV) bears more passing resemblance to the large, ing the airport than it does to the sleek, delta-winged HSCT that will one day fly the Pacific Rim at over twice the speed of sound. Yet to researchers...
Topics: DATA SYSTEMS, APPLICATIONS PROGRAMS (COMPUTERS), NASA PROGRAMS, COMPUTER NETWORKS, INFORMATION...
203
203
May 31, 2011
05/11
by
NON
texts
eye 203
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Activities for the Airborne Oceanographic Lidar (AOL) and the SeaWiFs data analysis projects supported under NASA contract NAS5-99094 for the period of April 2002 to May 2002 are recorded. Topics covered include: data acquisition, data analysis, field activities and software development.
Topics: TECHNOLOGY UTILIZATION, NORMS, FAULT DETECTION, APPLICATIONS PROGRAMS (COMPUTERS), COMPUTATIONAL...
698
698
Aug 2, 2010
08/10
by
Norman, Timothy L
texts
eye 698
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comment 0
The purpose of this research was to determine the mechanical properties of 2D and 3D braided textile composite materials. Specifically, those designed for tension or shear loading were tested under static loading to failure to investigate the effects of braiding. The overall goal of the work was to provide a structural designer with an idea of how textile composites perform under typical loading conditions. From test results for unnotched tension, it was determined that the 2D is stronger,...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), COMPUTATIONAL CHEMISTRY, CRYSTALLINITY, MECHANICAL PROPERTIES,...
227
227
Jul 26, 2010
07/10
by
Yin, Joh
texts
eye 227
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Information is given on the X.500 Directory Service in viewgraph form. The X.500 is an international standard for a globally distributed directory that provides basic addressing information, detailed information on countries, organizations, people, and resources. The present pilot project is able to access information in 14 countries.
Topics: APPLICATIONS PROGRAMS (COMPUTERS), COMPUTER INFORMATION SECURITY, COMPUTER NETWORKS, NASA PROGRAMS,...
205
205
Jun 13, 2011
06/11
by
Holekamp, Kara; Frisbie, Troy; Estep, Le
texts
eye 205
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In the original report dated February 11, 2005, the utility of the NASA Earth science data in the air quality activities of other agencies and organizations was assessed by reviewing strategic and mission plans and by conducting personal interviews with agency experts to identify and investigate agencies with the potential for partnership with NASA. The overarching agency strategic plans were reviewed and commonalities such as the desire for partnerships and technology development were noted....
Topics: SOFTWARE ENGINEERING, FLIGHT CONTROL, RADIATION EFFECTS, APPLICATIONS PROGRAMS (COMPUTERS),...
191
191
Aug 2, 2010
08/10
by
Goel, Amrit L.; Sahoo, Swarupa N
texts
eye 191
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The results are presented of an experimental study undertaken to assess the improvement in program quality by using formal specifications. Specifications in the Z notation were developed for a simple but realistic antimissile system. These specifications were then used to develop 2 versions in C by 2 programmers. Another set of 3 versions in Ada were independently developed from informal specifications in English. A comparison of the reliability and complexity of the resulting programs suggests...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), LABORATORIES, PRODUCT DEVELOPMENT, RESEARCH AND DEVELOPMENT,...
450
450
May 31, 2011
05/11
by
Weckmann, Stephani
texts
eye 450
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comment 0
The Clouds and the Earth's Radiant Energy System (CERES) is a program sponsored by the National Aeronautics and Space Administration (NASA) aimed at evaluating the global energy balance. Current scanning radiometers used for CERES consist of thin-film thermistor bolometers viewing the Earth through a Cassegrain telescope. The Thermal Radiation Group, a laboratory in the Department of Mechanical Engineering at Virginia Polytechnic Institute and State University, is currently studying a new...
Topics: COMPUTATIONAL GRIDS, COMPUTER PROGRAMMING, APPLICATIONS PROGRAMS (COMPUTERS), SOFTWARE ENGINEERING,...
325
325
Jul 26, 2010
07/10
by
Calogeras, James E.; Dustin, Miles O.; Secunde, Richard R
texts
eye 325
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Development of solar dynamic (SD) technologies for space over the past 25 years by NASA Lewis Research Center brought SD power to the point where it was selected in the design phase of Space Station Freedom Program as the power source for evolutionary growth. More recent studies showed that large cost savings are possible in establishing manufacturing processes at a Lunar Base if SD is considered as a power source. Technology efforts over the past 5 years have made possible lighter, more...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), COMPUTER NETWORKS, CONTROL SYSTEMS DESIGN, LIBRARIES, PRINTERS,...
Open Sesame! is the first commercial software product that learns user's behavior, and offers automation and coaching suggestions to the user. The neural learning module looks for repetitive patterns that have not been automated; when it finds one, it creates an observation and, upon approval, automates the task. The manufacturer, Charles River Analytics, credits Langley Research Center and Johnson Space Center Small Business Innovation Research grants and the time the president and vice...
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL INTELLIGENCE, TECHNOLOGY UTILIZATION, AUTOMATION,...
This viewgraph presentation presents the following results for the example comparison: EG&G code with face deformations suppressed and SPIRALG agree well with each other as well as with the experimental data; 0 rpm stiffness data calculated by EG&G code are about 70-100 percent lower than that by SPIRALG; there is no appreciable difference between 0 rpm and 16,000 rpm stiffness and damping coefficients calculated by SPIRALG; and the film damping above 500 psig calculated by SPIRALG is...
Topics: NASA Technical Reports Server (NTRS), APPLICATIONS PROGRAMS (COMPUTERS), COMPARISON, SEALS...
VTGRAPH is a graphics software tool for using DEC/VT or VT compatible terminals. It allows the user to deal with computer environments which use VT terminals for window management and graphics systems. VTGRAPH was developed using the Re'Gis Graphics set and it was written in FORTRAN language. It provides window management and a PLOT10-like package plus color or shade capability.
Topics: NASA Technical Reports Server (NTRS), APPLICATIONS PROGRAMS (COMPUTERS), COMPUTER GRAPHICS, COLOR,...
DATASTAR, Inc., of Picayune, Miss., has taken NASA's award-winning Earth Resources Laboratory Applications (ELAS) software program and evolved it to the point that the company is now providing a unique, spatial imagery service over the Internet. ELAS was developed in the early 80's to process satellite and airborne sensor imagery data of the Earth's surface into readable and useable information. While there are several software packages on the market that allow the manipulation of spatial data...
Topics: NASA Technical Reports Server (NTRS), SATELLITE IMAGERY, APPLICATIONS PROGRAMS (COMPUTERS),...
555
555
Jun 19, 2010
06/10
by
NON
texts
eye 555
favorite 0
comment 0
Interdisciplinary symposium on Apollo Applications Programs
Topics: APOLLO APPLICATIONS PROGRAM, APOLLO PROJECT, APPLICATIONS PROGRAMS (COMPUTERS), CONFERENCES, APOLLO...
416
416
May 30, 2011
05/11
by
Zakrzwski, Charles; Sanneman, Paul; Hunt, Teresa; Blackman, Kathi
texts
eye 416
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comment 0
The Pulsed Plasma Thruster (PPT) Experiment on the Earth Observing 1 (EO-1) spacecraft has been designed to demonstrate the capability of a new generation PPT to perform spacecraft attitude control. The PPT is a small, self-contained pulsed electromagnetic Propulsion system capable of delivering high specific impulse (900-1200 s), very small impulse bits (10-1000 micro N-s) at low average power (less than 1 to 100 W). EO-1 has a single PPT that can produce torque in either the positive or...
Topics: ALGORITHMS, COMPUTATION, READING, APPLICATIONS PROGRAMS (COMPUTERS), COMPUTER STORAGE DEVICES, DISK...
257
257
May 31, 2011
05/11
by
Edquist, Karl T.; Liechty, Derek S.; Hollis, Brian R.; Alter, Stephen J.; Loomis, Mark P
texts
eye 257
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A proposed Mars Smart Lander is designed to reach the surface via lifting-body atmospheric entry (alpha = 16 deg) to within 10 km of the target site. CFD (computational fluid dynamics) predictions of the forebody aeroheating environments are given for a direct entry from a 2005 launch. The solutions were obtained using an 8-species gas in thermal and chemical nonequilibrium with a radiative-equilibrium wall temperature boundary condition. Select wind tunnel data are presented from tests at NASA...
Topics: COMPUTATIONAL FLUID DYNAMICS, COMPUTER AIDED DESIGN, TRIANGULATION, APPLICATIONS PROGRAMS...
1,246
1.2K
Jun 13, 2011
06/11
by
Lockwood, Mary Kae; O'Kongo, N., et al; Edquist, Karl T.; Starr, Brett R.; Hollis, Brian R.; Hrinda, Glenn A.; Bailey, Robert W.; Hall, Jeffery L.; Spilker, Thomas R.; Noca, Muriel A.
texts
eye 1,246
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A Systems Analysis was completed to determine the feasibility, benefit and risk of an aeroshell aerocapture system for Neptune and to identify technology gaps and technology performance goals. The systems analysis includes the following disciplines: science; mission design; aeroshell configuration; interplanetary navigation analyses; atmosphere modeling; computational fluid dynamics for aerodynamic performance and aeroheating environment; stability analyses; guidance development; atmospheric...
Topics: FLIGHT CONTROL, INTERNATIONAL SPACE STATION, TELEMETRY, PROTOCOL (COMPUTERS), C (PROGRAMMING...
840
840
Aug 2, 2010
08/10
by
Berrios, William M.; Sampair, Thomas R
texts
eye 840
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Results of the post-flight thermal analysis of the Long Duration Exposure Facility (LDEF) mission are presented. The LDEF mission thermal analysis was verified by comparing the thermal model results to flight data from the LDEF Thermal Measurements System (THERM). Post-flight calculated temperature uncertainties have been reduced to under /- 18 F from the pre-flight uncertainties of /- 40 F. The THERM consisted of eight temperature sensors, a shared tape recorder, a standard LDEF flight...
Topics: AERODYNAMICS, APPLICATIONS PROGRAMS (COMPUTERS), FLIGHT MECHANICS, LABORATORIES, PRODUCT...
Optivision developed two PC-compatible boards and associated software under a Goddard Space Flight Center Small Business Innovation Research grant for NASA applications in areas such as telerobotics, telesciences and spaceborne experimentation. From this technology, the company used its own funds to develop commercial products, the OPTIVideo MPEG Encoder and Decoder, which are used for realtime video compression and decompression. They are used in commercial applications including interactive...
Topics: NASA Technical Reports Server (NTRS), TECHNOLOGY UTILIZATION, VIDEO COMPRESSION, TELEROBOTICS,...
This slide presentation reviews NASA's use of a new super computer, called Columbia, capable of operating at 62 Tera Flops. This computer is the 4th fastest computer in the world. This computer will serve all mission directorates. The applications that it would serve are: aerospace analysis and design, propulsion subsystem analysis, climate modeling, hurricane prediction and astrophysics and cosmology.
Topics: NASA Technical Reports Server (NTRS), NASA PROGRAMS, SUPERCOMPUTERS, APPLICATIONS PROGRAMS...
383
383
May 31, 2011
05/11
by
Chamis, C. C.; Abumeri, G. H
texts
eye 383
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The response to high velocity impact of a composite blade is probabilistically evaluated. The evaluation is focused on quantifying probabilistically the effects of uncertainties (scatter) in the variables that describe the impact, the blade make-up (geometry and material), the blade response (displacements, strains, stresses, frequencies), the blade residual strength after impact, and the blade damage tolerance. The results of probabilistic evaluations results are in terms of probability...
Topics: STATISTICAL ANALYSIS, KNOWLEDGE, FUNCTIONS (MATHEMATICS), HYPOTHESES, INFERENCE, BIOASSAY,...
315
315
May 31, 2011
05/11
by
Blanche, Ji
texts
eye 315
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comment 0
This paper presents an assessment of two wire harness failures that had occurred in Solid Rocket Booster Altitude Switch Assemblies S/N 200001 and S/N 20002. A list of modifications to EDU #4 and modification of qualification units 2000001 and 2000002 are also presented.
Topics: ROBOTS, TEAMS, INSPECTION, APPLICATIONS PROGRAMS (COMPUTERS), DESIGN OPTIMIZATION, SIMULATION,...
905
905
Jul 26, 2010
07/10
by
Lee, Joo Ahn; Carini, John; Choi, Andrew; Dillman, Robert; Griffin, Sean J.; Hanneman, Susan; Mamplata, Caesar; Stanton, Edwar
texts
eye 905
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A conceptual design is presented of a Lunar Lander, which can be the primary vehicle to transport the equipment necessary to establish a surface lunar base, the crew that will man the base, and the raw materials which the Lunar Station will process. A Lunar Lander will be needed to operate in the regime between the lunar surface and low lunar orbit (LLO), up to 200 km. This lander is intended for the establishment and operation of a manned surface base on the moon and for the support of the...
Topics: ITERATION, PARALLEL PROCESSING (COMPUTERS), PREPROCESSING, RUN TIME (COMPUTERS), SCHEDULING,...
535
535
Aug 2, 2010
08/10
by
Kelly, John C.; Sherif, Joseph S.; Hops, Jonatha
texts
eye 535
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Software inspection is a technical evaluation process for finding and removing defects in requirements, design, code, and tests. Detailed data was collected during the first three years of experience at JPL on 203 inspections. Statistics are discussed for this set of inspections. Included, on a per inspection basis, are averages of: staff time expended, pages covered, major defects found, minor defects found, and inspection team size. Analysis of variance showed a significantly higher density...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), LABORATORIES, PROCESS CONTROL (INDUSTRY), PRODUCT DEVELOPMENT,...
600
600
Jun 9, 2011
06/11
by
Ponchak, George E.; Papapolymerou, John; Tentzeris, Manos M
texts
eye 600
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The coupling between the desired CPW mode and the unwanted coupled slotline mode is presented for finite ground coplanar waveguides with unequal ground plane widths. Measurements, quasi-static conformal mapping, and Finite-Difference Time-Domain analysis are performed to determine the dependence of the slotline mode excitation on the physical dimensions of the FGC line and on the frequency range of operation. It is shown that the ratio of the slotline mode to the CPW mode can be as high as 18...
Topics: ARCHITECTURE (COMPUTERS), APPLICATIONS PROGRAMS (COMPUTERS), MULTIDISCIPLINARY DESIGN OPTIMIZATION,...
Compress and clean raw data file for permanent storage We have identified various error conditions/types and developed algorithms to get rid of these errors/noises, including the more complicated noise in the newer data sets. (status = 100% complete). Internet access of compacted raw data. It is now possible to access the raw data via our web site, http://www.jhuapl.edu/Aurora/index.html. The software to read and plot the compacted raw data is also available from the same web site. The users...
Topics: NASA Technical Reports Server (NTRS), DMSP SATELLITES, DATA PROCESSING, ALGORITHMS, ERRORS,...
Some insights are given which were gained by one user through experience with the use of the ADIFOR 2.0D software for automatic differentiation of Fortran code. These insights are generally in the area of the user interface with the generated derivative code - particularly the actual form of the interface and the use of derivative objects, including "seed" matrices. Some remarks are given as to how to iterate application of ADIFOR in order to generate second derivative code.
Topics: NASA Technical Reports Server (NTRS), FORTRAN, MATRICES, APPLICATIONS PROGRAMS (COMPUTERS),...
283
283
Jul 23, 2010
07/10
by
Acosta, Roberto J.; Zaman, Afroz A
texts
eye 283
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Reflector antennas on Earth orbiting spacecrafts generally cannot be described analytically. The reflector surface is subjected to a large temperature fluctuation and gradients, and is thus warped from its true geometrical shape. Aside from distortion by thermal stresses, reflector surfaces are often purposely shaped to minimize phase aberrations and scanning losses. To analyze distorted reflector antennas defined by discrete surface points, a numerical technique must be applied to compute an...
Topics: APPLICATIONS PROGRAMS (COMPUTERS), COMPATIBILITY, COMPUTER AIDED DESIGN, FINITE ELEMENT METHOD,...
IPG Execution Service is a framework that reliably executes complex jobs on a computational grid, and is part of the IPG service architecture designed to support location-independent computing. The new grid service enables users to describe the platform on which they need a job to run, which allows the service to locate the desired platform, configure it for the required application, and execute the job. After a job is submitted, users can monitor it through periodic notifications, or through...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL GRIDS, DATA MANAGEMENT, DATA BASES,...
