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  • 1
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    Laser beam manifold and particle photography system for use in fluid velocity measurements (1980)
    American Institute of Physics
    Details
    Publication Date: 1980-11-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    A prototype case-based reasoning human assistant for space crew assessment and mission management (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We present a prototype human assistant system for space crew assessment and mission management. Our system is based on case episodes from American and Russian space missions and analog environments such as polar stations and undersea habitats. The general domain of small groups in isolated and confined environments represents a near ideal application area for case-based reasoning (CBR) - there are few reliable rules to follow, and most domain knowledge is in the form of cases. We define the problem domain and outline a unique knowledge representation system driven by conflict and communication triggers. The prototype system is able to represent, index, and retrieve case studies of human performance. We index by social, behavioral, and environmental factors. We present the problem domain, our current implementation, our research approach for an operational system, and prototype performance and results.
    Keywords: CYBERNETICS
    Type: In: Applications of artificial intelligence 1993: Knowledge-based systems in aerospace and industry; Proceedings of the Meeting, Orlando, FL, Apr. 13-15, 1993 (A93-33126 12-63); p. 262-273.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Holography on the Spacelab 3 mission (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Spacelab 3's Fluid Experiment System, in which triglycine sulfate crystals were produced by a low temperature solution-growth technique, employs holography as its primary data-gathering system. This use of holography allows optical techniques which would be difficult to apply in orbit to be used after the holographic data is returned to ground laboratories, using an analysis of the reconstructed holographic image. The system used allows both single- and double-exposure holograms to be obtained in two separate orthogonal configurations.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Optics News (ISSN 0098-907x); 11
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Laser schlieren crystal monitor (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A system and method for monitoring the state of a crystal which is suspended in a solution is described which includes providing a light source for emitting a beam of light along an optical axis. A collimating lens is arranged along the optical axis for collimating the emitted beam to provide a first collimated light beam consisting of parallel light rays. By passing the first collimated light beam through a transparent container, a number of the parallel light rays are deflected off the surfaces of said crystal being monitored according to the refractive index gradient to provide a deflected beam of deflected light rays. A focusing lens is arranged along optical axis for focusing the deflected rays towards a desired focal point. A knife edge is arranged in a predetermined orientation at the focal point; and a screen is provided. A portion of the deflected beam is blocked with the knife edge to project only a portion of the deflected beam. A band is created at one edge of the image of the crystal which indicates the state of change of the surface of the crystal being monitored.
    Keywords: SOLID-STATE PHYSICS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Liquid drop stability for protein crystal growth in microgravity (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: It is possible to grow protein crystals for biomedical research in microgravity by deploying a protein-rich solution from a syringe, forming a drop in which crystallization can occur with the proper degree of supersaturation. Drop stability is critical to the success of this research, due to the large drop sizes which can be achieved in space. In order to determine the type of syringe tips most suitable to support these large drops, tests were performed during brief periods of weightlessness onboard the NASA KC-135 low-gravity simulation aircraft. The drops were analyzed using three simple models in which the samples were approximated by modified pendulum and spring systems. It was concluded that the higher frequency systems were the most stable, indicating that of the syringes utilized, a disk-shaped configuration provided the most stable environment of low-gravity protein crystal growth.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: NASA-TP-2724 , NAS 1.60:2724
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Research in materials processing using a low gravity simulation aircraft (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The feasibility of performing materials experiments aboard the NASA KC-135 low gravity simulation aircraft is demonstrated. The vehicle serves as a research platform which flies parabolic maneuvers. Experiments which have been conducted on board the aircraft are outlined and particular attention is given to tests utilizing optical measurement techniques such as interferometry, schlieren, and holography. It is noted that the KC-135 can be used for crew training, flight hardware checkout, conceptual development, self-sufficient experiments, and research in support of and leading to space flight experiments.
    Keywords: MATERIALS PROCESSING
    Type: AAS 86-560
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Microgravity research applications of interferometry to heat and mass transfer (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Major space flight experiments which have used interferometric measurement as a major support system are described together with similar ground-based research. Space experiments include those flown on Spacelab 3 ad on the D-1 mission. Included in the ground-based experiments are aircraft studies, Spacelab 3 data reduction and evaluation, and supportive laboratory hardware development. It is shown that optical measurement techniques are crucial to microgravity research.
    Keywords: MATERIALS PROCESSING
    Type: AAS 86-562
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Hardware Specific Integration Strategy for Impedance-Based Structural Health Monitoring of Aerospace Systems (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Integrated Vehicle Health Management (IVHM) Project, sponsored by NASA's Aeronautics Research Mission Directorate, is conducting research to advance the state of highly integrated and complex flight-critical health management technologies and systems. An effective IVHM system requires Structural Health Monitoring (SHM). The impedance method is one such SHM technique for detection and monitoring complex structures for damage. This position paper on the impedance method presents the current state of the art, future directions, applications and possible flight test demonstrations.
    Keywords: Electronics and Electrical Engineering
    Type: NASA/CR-2011-217153 , NF1676L-12817
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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