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There are a total of 41266 record(s) matching your query.
Sorted by: NASA Center in Ascending order
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Prediction of Aerodynamic Coefficients using Neural Networks for Sparse Data
Author(s): Rajkumar, T.; Bardina, Jorge
Abstract: Basic aerodynamic coefficients are modeled as functions of angles of attack and sideslip with vehicle lateral symmetry and compressibility effects. Most of the aerodynamic parameters can be well-fitted using polynomial ...
NASA Center: Ames Research Center
Publication Year: 2002
Added to NTRS: 2008-06-02
Document ID: 20020051082
Analytical modeling of helium II in forced flow conditions
Author(s): Ng, Y. S.; Lee, J. H.; Brooks, W.
Abstract: A numerical model was developed to examine the flow behavior of He II under forced flow conditions. The model basically solves the governing equations in the two-fluid model of He II, and can be used to assess the pump ...
NASA Center: Ames Research Center
Publication Year: 1987
Added to NTRS: 2004-11-03
Accession Number: 87A44827; Document ID: 19870057553; Report Number: AIAA PAPER 87-1495
Performance of the SBRC 190, a cryogenic multiplexer for photoconductor arrays
Author(s): Dotson, Jessie L.; Koerber, C. T.; Mason, C. G.; Simpson, J. P.; Moore, E. M.; Witteborn, F. C.; Farhoomand, J.; Erickson, E. F.
Abstract: The SBRC 190 cryogenic readouts were developed for use with far-infrared arrays of Ge:Sb and Ge:Ga photoconductor detectors. The SBRC 190 provides an AC-coupled CTIA (capacitance transimpedance amplifier) unit cell for each ...
NASA Center: Ames Research Center
Publication Year: 2002
Added to NTRS: 2004-11-03
Document ID: 20020054194
Model-Based Testability Assessment and Directed Troubleshooting of Shuttle Wiring Systems
Author(s): Deb, Somnath; Domagala, Chuck; Shrestha, Roshan; Malepati, Venkatesh; Cavanaugh, Kevin; Patterson-Hine, Ann; Sanderfer, Dwight; Cockrell, Jim
Abstract: We have recently completed a pilot study on the Space shuttle wiring system commissioned by the Wiring Integrity Research (WIRe) team at NASA Ames Research Center, As the space shuttle ages, it is experiencing wiring ...
NASA Center: Ames Research Center
Publication Year: 2000
Added to NTRS: 2008-06-02
Document ID: 20010072403
Investigation Flow Uniformity in a Supersonic Duct with High Enthalpy Flows
Author(s): Balboni, John; Atler, Doug; Gokcen, Tahir
Abstract: Flow uniformity in a high enthalpy facility is investigated. The scramjet research facility is composed of a rectangular combustor duct connected to a 100 MW electric arc air heater. The Mach 3.3 flow is accelerated through ...
NASA Center: Ames Research Center
Publication Year: 1995
Added to NTRS: 2004-11-03
Document ID: 20020027524
Virtual Acoustic Displays for Teleconferencing: Intelligibility Advantage for "Telephone Grade" Audio
Author(s): Begault, Durand R.
Abstract: Speech intelligibility was evaluated using a virtual acoustic ("3-D audio") display using the method specified by ANSI. Ten subjects were evaluated with stimuli either unfiltered or low-pass filtered at 4 kHz. Results show ...
NASA Center: Ames Research Center
Publication Year: 1994
Added to NTRS: 2004-11-03
Document ID: 20020010908
Entry aeromaneuvering capabilities of transatmospheric vehicles
Author(s): Menees, Gene P.; Tauber, Michael E.; Wilson, John F.; Yang, Lily; Adelman, Henry G.
Abstract: The landing footprint of a conceptual high-lift transatmospheric vehicle is defined for aeromaneuvering entry from a typical low-earth orbit. The flight strategy for trajectory construction to maximize the landing area by ...
NASA Center: Ames Research Center
Publication Year: 1988
Added to NTRS: 2004-11-03
Accession Number: 88A22215; Document ID: 19880034988; Report Number: AIAA PAPER 88-0300
Navier-Stokes Aerodynamic Simulation of the V-22 Osprey on the Intel Paragon MPP
Author(s): Vadyak, Joseph; Shrewsbury, George E.; Narramore, Jim C.; Montry, Gary; Holst, Terry
Abstract: The paper will describe the Development of a general three-dimensional multiple grid zone Navier-Stokes flowfield simulation program (ENS3D-MPP) designed for efficient execution on the Intel Paragon Massively Parallel ...
NASA Center: Ames Research Center
Publication Year: 1995
Added to NTRS: 2004-11-03
Document ID: 20020012216
The investigation of inlet/nozzle flowfield coupling using compact propulsion simulators
Author(s): Zilz, D. E.; Bailey, R. O.
Abstract: An investigation of airframe/propulsion system flowfield coupling has been conducted in the Ames 11-Foot Transonic Wind Tunnel at Mach numbers from 0.40 to 1.40 and at angles-of-attack from -2 to 20 deg. Propulsive flows ...
NASA Center: Ames Research Center
Publication Year: 1985
Added to NTRS: 2004-11-03
Accession Number: 85A39698; Document ID: 19850057547; Report Number: AIAA PAPER 85-1284
Assessment of the Technical Readiness of the Vapor Phase Catalytic Ammonia Removal Process
Author(s): Flynn, Michael; Borchers, Bruce
Abstract: This paper provides an assessment of the technical readiness of the Vapor Phase Catalytic Ammonia Removal Process (VPCAR). The VPCAR technology is a fully regenerative water recycling technology designed specifically for ...
NASA Center: Ames Research Center
Publication Year: 1999
Added to NTRS: 2004-11-03
Document ID: 20010062490; Report Number: SAE-TP-69
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