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  • Other Sources  (928)
  • AERODYNAMICS  (684)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (244)
  • Life and Medical Sciences
  • 1990-1994  (928)
  • 1970-1974
  • 1920-1924
  • 1910-1914
  • 1991  (928)
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  • 1990-1994  (928)
  • 1970-1974
  • 1920-1924
  • 1910-1914
Year
  • 1
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    Recycling in Space (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA's effort to provide a completely enclosed life support system that offers food and recycled air, water, and waste for long-duration space travel or settlements is explained.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ASR-256 , NASA-TM-109307 , NONP-NASA-VT-93-185325
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Philosophy, policies, and procedures - The three P's of flight-deck operations (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Standard operating procedures are drafted and provided to flightcrews to dictate the manner in which tasks are carried out. Failure to conform to Standard Operating Procedures (SOP) is frequently listed as the cause of violations, incidents, and accidents. However, procedures are often designed piecemeal, rather than being based on a sound philosophy of operations and policies that follow from such a philosophy. A framework of philosophy, policies, and procedures is proposed.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: International Symposium on Aviation Psychology; Apr 29, 1991 - May 02, 1991; Columbus, OH; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Space human factors discipline science plan (1991)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The purpose of this Discipline Science Plan is to provide a conceptual strategy for NASA's Life Sciences Division research and development activities in the comprehensive areas of behavior, performance, and human factors. This document summarizes the current status of the program, outlines available knowledge, establishes goals and objectives, defines critical questions in the subdiscipline areas, and identifies technological priorities. It covers the significant research areas critical to NASA's programmatic requirements for the Extended Duration Orbiter, Space Station Freedom, and Exploration mission science activities. These science activities include ground-based and flight; basic, applied and operational; and animal and human research and development. This document contains a general plan that will be used by both NASA Headquarters program offices and the field centers to review and plan basic, applied, and operational research and development activities, both intramural and extramural, in this area.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA-TM-108023 , NAS 1.15:108023
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Scientific Balloons (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: This video discusses how NASA uses large helium-filled balloons to take payloads up 25 miles to the edge of space to gather data. Balloons provide a cost effective approach to reach these heights.
    Keywords: AERODYNAMICS
    Type: NASA-TM-109907 , NONP-NASA-VT-94-23149 , ASR-258
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    NASA TECHNICAL REPORTS
  • 5
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    Unstructured and adaptive mesh generation for high Reynolds number viscous flows (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A method for generating and adaptively refining a highly stretched unstructured mesh suitable for the computation of high-Reynolds-number viscous flows about arbitrary two-dimensional geometries was developed. The method is based on the Delaunay triangulation of a predetermined set of points and employs a local mapping in order to achieve the high stretching rates required in the boundary-layer and wake regions. The initial mesh-point distribution is determined in a geometry-adaptive manner which clusters points in regions of high curvature and sharp corners. Adaptive mesh refinement is achieved by adding new points in regions of large flow gradients, and locally retriangulating; thus, obviating the need for global mesh regeneration. Initial and adapted meshes about complex multi-element airfoil geometries are shown and compressible flow solutions are computed on these meshes.
    Keywords: AERODYNAMICS
    Type: International Conference on Numerical Grid Generation in Computational Fluid Dynamics and Related Fields; Jun 03, 1991 - Jun 07, 1991; Barcelona; Spain
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    NASA TECHNICAL REPORTS
  • 6
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    Waves and thermodynamics in high Mach number propulsive ducts (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The propulsive effects of waves in ducts, especially at high Mach numbers, are investigated, focusing on drag and thrust and on the conversion of heat into waves which produce thrust. It is shown that essentially all of the work done by an expanding fluid passing through a duct at high Mach number is delivered in the form of waves, and that duct surface angles exist that are optimum for the production of thrust from a wave. The effects of wave phenomena on drag and thrust are considered by extending the concept of a Busemann biplane into that of a 'Busemann scramjet, taking 'off-design' performance into account. An idealized model of a streamtube with heat addition is developed, and flow mechanisms involved in generating thrust by the expansion of this streamtube in an exhaust nozzle are examined.
    Keywords: AERODYNAMICS
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    NASA TECHNICAL REPORTS
  • 7
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    Bioregenerative life support - The initial CELSS reference configuration (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The next major step in the development of an operational Controlled Ecological Life-Support System (CELSS) is the creation of a human-rated ground-based demonstrator able to constitute a CELSS's proof-of-concept. The reference configuration recently devised for such a ground facility by NASA will furnish a common reference to all investigators in the field, thereby facilitating performance comparisons among candidate subsystems and clarifying system-level modeling. A detailed NASA reference CELSS flowcharting is presented.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 911420 , International Conference on Environmental Systems; Jul 15, 1991 - Jul 18, 1991; San Francisco, CA; United States
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  • 8
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    Passive control of supersonic cavity flowfields (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A computational investigation has been conducted to study the effect and mechanisms of the passive control of a supersonic flow over a rectangular two-dimensional cavity. The passive control was included through the use of a porous surface over a vent chamber in the floor of the cavity. The passive control effectively suppressed the low-frequency pressure oscillations for the open type cavity, (length-to-depth ratio = 6.0). The mechanism for the suppression was observed to be the stabilization of the motion of the free shear layer. For the closed type cavity flow, (length-to-depth ratio = 17.5), the passive control modified the flowfield to nearly that of an open type cavity flow; further the cavity drag was reduced by a factor of four. The computational results of both cases showed good agreement with the available experimental data and the predictions of a semiempirical formula. This study demonstrates that the passive control concept can be used to improve the aerodynamic characteristics of open and closed cavity flowfields.
    Keywords: AERODYNAMICS
    Type: SAE PAPER 912153
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  • 9
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    Process control integration requirements for advanced life support systems applicable to manned space missions (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: An overview of recent developments in process-control technology which might have applications in future advanced life support systems for long-duration space operations is presented. Consideration is given to design criteria related to control system selection and optimization, and process-control interfacing methodology. Attention is also given to current life support system process control strategies, innovative sensors, instrumentation and control, and innovations in process supervision.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: SAE PAPER 911357
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  • 10
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    Neurosciences research in space - Future directions (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: In order to gain a better understanding of the effects of long-duration space missions on the central nervous system, near-term research, to take place from 1990-1995, will be directed at investigating the acute effects of microgravity and the 'space adaptation syndrome'. These include experiments scheduled for the Spacelab Life Sciences 1 which is designed to evaluate changes in the visual, vestibular, and proprioceptive systems. An extensive series of experiments, collectively termed Microgravity Vestibular Investigations (MVI), is also planned for the IML-1 mission to be flown in 1992. The IML-2 mission will emphasize behavior and performance, biological rhythms, and further vestibular studies. Mid-term goals, projected to be achieved from 1995-2000, include the use of new technology such as magnetic recording techniques. Long-term goals are also discussed including studies dealing with neuronal plasticity and sensory substitution, augmentation, and robotic telepresence.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Acta Astronautica (ISSN 0094-5765); 23; 289-293
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