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  • Other Sources  (7)
  • 2020-2023
  • 2015-2019
  • 1990-1994  (7)
  • 1965-1969
  • 1992  (7)
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  • 2020-2023
  • 2015-2019
  • 1990-1994  (7)
  • 1965-1969
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  • 1
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    Fuzzy logic control for camera tracking system (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A concept utilizing fuzzy theory has been developed for a camera tracking system to provide support for proximity operations and traffic management around the Space Station Freedom. Fuzzy sets and fuzzy logic based reasoning are used in a control system which utilizes images from a camera and generates required pan and tilt commands to track and maintain a moving target in the camera's field of view. This control system can be implemented on a fuzzy chip to provide an intelligent sensor for autonomous operations. Capabilities of the control system can be expanded to include approach, handover to other sensors, caution and warning messages.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Fifth Annual Workshop on Space Operations Applications and Research (SOAR 1991), Volume 1; p 94-99
    Format: application/pdf
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  • 2
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    Manned mission to Mars with periodic refueling from electrically propelled tankers (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In a joint study by students from the Ecole Polytechnique Feminine, France, and the University of California, Los Angeles, a mission concept that had the objective of evaluating the feasibility of a non-nuclear, yet fast, manned mission to Mars was considered. Ion-engine propelled tankers are postulated that would provide mid-coarse refueling of LOX and LH2 to the manned ship. The scenario is therefore one of a 'split mission', yet with the added feature that the cargo ships include tankers for mid-course refueling. The present study is a continuation of one first conducted last year. Emphasis this year was on the design of the tanker fleet.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: USRA, Proceedings of the 8th Annual Summer Conference: NASA(USRA Advanced Design Program; p 22-30
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  • 3
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    Effect of spaceflight on the extracellular matrix of skeletal muscle after a crush injury (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The organization and composition of the extracellular matrix were studied in the crush-injured gastrocnemius muscle of rats subjected to 0 G. After 14 days of flight on Cosmos 2044, the gastrocnemius muscle was removed and evaluated by histochemical and immunohistochemical techniques from the five injured flight rodents and various earth-based treatment groups. In general, the repair process was similar in all injured muscle samples with regard to the organization of the extracellular matrix and myofibers. Small and large myofibers were present within an expanded extracellular matrix, indicative of myogenesis and muscle regeneration. In the tail-suspended animals, a more complete repair was observed with nonenlarged area of nonmuscle cells or matrix material visible. In contrast, the muscle samples from the flight animals were less well organized and contained more macrophages and blood vessels in the repair region, indicative of a delayed repair process, but did not demonstrate any chronic inflammation. Myofiber repair did vary in muscles from the different groups, being slowest in the flight animals and most complete in the tail-suspended ones.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Journal of Applied Physiology, Supplement (ISSN 8750-7587); 73; 2 Au; 74S-81S
    Format: text
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  • 4
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    Laser Raman sensor for measurement of trace-hydrogen gas (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A new optical hydrogen sensor based on spontaneous Raman scattering of laser light has been designed and constructed for rugged field use. It provides good sensitivity, rapid response, and the inherent Raman characteristics of linearity and background gas independence of the signal. Efficient light collection and discrimination by using fast optics and a bandpass interference filter compensate for the inefficiency of the Raman-scattering process. A multipass optical cavity with a Herriott-type configuration provides intense illumination from an air-cooled CW gas laser. The observed performance is in good agreement with the theoretical signal and noise level predictions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 31; 831-835
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  • 5
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    Optimization of niobium tunnel junctions as X-ray detectors (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We report on our ongoing work using Nb/Al/AlO(x)/Nb junctions for the detection of X-rays. Detectors based on superconducting tunneling junctions offer the prospect of resolution over an order of magnitude higher than is obtainable with the current generation of semiconductor-based detectors. Results of measurements taken at 1.85 K (a temperature achievable with current space flight technology) include the current-voltage (I-V) curve, subgap current vs temperature, the dependence of the superconducting current on the applied magnetic field (Fraunhofer pattern), X-ray pulses, and the spectra from a 6 keV X-ray source which gave an intrinsic device resolution of approximately 700 eV. The collection of more than 10 exp 5 electrons per 6 keV photon is established.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: In: EUV, X-ray, and gamma-ray instrumentation for astronomy III; Proceedings of the Meeting, San Diego, CA, July 22-24, 1992 (A93-29476 10-35); p. 2-11.
    Format: text
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  • 6
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    Effect of crystal orientation on conductivity and electron mobility in single-crystal alumina (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The electrical conductivity of high-purity, single-crystal alumina is determined parallel to and perpendicular to the c-axis. The mean conductivity of four samples of each orientation is a factor 3.3 higher parallel to the c-axis than perpendicular to it. The conductivity as a function of temperature is attributed to extrinsic electron conduction at temperatures from 400 to 900 C, and intrinsic semiconduction at temperatures from 900 to 1300 C. In the high-temperature regime, the slope on all eight specimens is 4.7 +/- 0.1 eV. Hence, the thermal bandgap at O K is 9.4 +/- 0.2 eV.
    Keywords: NONMETALLIC MATERIALS
    Type: American Ceramic Society, Journal (ISSN 0002-7820); 75; 10; p. 2790-2794.
    Format: text
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  • 7
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    Conduction mechanism of single-crystal alumina (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The fully guarded three-terminal technique was used to perform conductivity measurements on single-crystal alumina at temperatures of 400-1300 C. The conductivity was also determined as a function of time at various temperatures and applied fields. Further, the fractions of the current carried by Al and O ions (ionic transference numbers) were determined from long-term transference experiments in the temperature range 1100-1300 C. A mathematical model of the conduction mechanism is proposed, and model predictions are compared with experimental results.
    Keywords: NONMETALLIC MATERIALS
    Type: American Ceramic Society, Journal (ISSN 0002-7820); 75; 295-304
    Format: text
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