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  • 1
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    Mini-Sosie high-resolution seismic method aids hazards studies (1992)
    In:  Eos, Trans., Am. Geophys. Un., Würzburg, Pergamon, vol. 73, no. 44, pp. 473-476, pp. B05S01, (ISSN: 1340-4202)
    Details
    Publication Date: 1992
    Keywords: Seismics (controlled source seismology) ; Earthquake hazard
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    A re-investigation of the 'double dawn' event recorded in the Bamboo Annals (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: An allusion to a 'double dawn' phenomenon in an ancient Chinese chronicle, which has been identified as caused by a sunrise eclipse occurring in 899 BC, is discussed. This event has been regarded as of considerable importance in the investigation of earth's past rotation. It is shown that an eclipse interpretation is implausible, not least because the eclipse in question was only annular.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738); 33; 2, Ju; 91-98
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The NASA space power technology program (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: NASA has a broad technology program in the field of space power. This paper describes that program, including the roles and responsibilities of the various NASA field centers and major contractors. In the power source area, the paper discusses the SP-100 Space Nuclear Power Project, which has been under way for about seven years and is making substantial progress toward development of components for a 100-kilowatt power system that can be scaled to other sizes. This system is a candidate power source for nuclear electric propulsion, as well as for a power plant for a lunar base. In the energy storage area, the paper describes NASA's battery- and fuel-cell development programs. NASA is actively working on NiCd, NiH2, and lithium batteries. A status update is also given on a U.S. Air Force-sponsored program to develop a large (150 ampere-hour) lithium-thionyl chloride battery for the Centaur upper-stage launch vehicle. Finally, the area of power management and distribution (PMAD) is addressed, including power system components such as solid-state switches and power integrated circuits. Automated load management and other computer-controlled functions offer considerable payoffs. The state of the art in space power is described, along with NASA's medium- and long-term goals in the area.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: ; : Spaceflight mechan
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Fast casual multicast (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new protocol is presented that efficiently implements a reliable, causally ordered multicast primitive and is easily extended into a totally ordered one. Intended for use in the ISIS toolkit, it offers a way to bypass the most costly aspects of ISIS while benefiting from virtual synchrony. The facility scales with bounded overhead. Measured speedups of more than an order of magnitude were obtained when the protocol was implemented within ISIS. One conclusion is that systems such as ISIS can achieve performance competitive with the best existing multicast facilities--a finding contradicting the widespread concern that fault-tolerance may be unacceptably costly.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-186643 , NAS 1.26:186643
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Lateral-directional stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA) (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results are presented of flight experiments to determine the lateral-directional stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA), an experimental aircraft designed to furnish information on various aerodynamic characteristics of a transport type of airplane that makes use of the upper-surface blown (USB) flap technology to achieve short takeoff and landing (STOL) performance. The flight program designed to acquire the data consisted of maneuvers produced by rudder and control-wheel inputs with the airplane in several configurations that had been proposed for landing approach and takeoff operation. The normal stability augmentation system was not engaged during these maneuvers. Time-history records from the maneuvers were analyzed with a parameter estimation procedure to extract lateral-directional stability and control derivatives. For one aircraft configuration in which the USB flaps were deflected 50 deg, several maneuvers were performed to determine the effects of varying the average angle of attack, varying the thrust coefficient, and setting the airplane's upper surface spoilers at a 13 deg symmetrical bias angle . The effects on the lateral characteristics of deflecting the spoilers were rather small and generally favorable. The data indicate that for one test, conducted at low thrust (a thrust coefficient of 0.38), compared with results from tests at thrust coefficients of 0.77 and larger, there was a significant decrease in the lateral control effectiveness, in the yaw damping and in the directional derivative. The directional derivative was also decreased (by about 30 percent) when the average angle of attack of the test was increased from 3 to 16 deg.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TM-102250 , A-90007 , NAS 1.15:102250
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Fast causal multicast (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new protocol is presented that efficiently implements a reliable, causally ordered multicast primitive and is easily extended into a totally ordered one. Intended for use in the ISIS toolkit, it offers a way to bypass the most costly aspects of ISIS while benefiting from virtual synchrony. The facility scales with bounded overhead. Measured speedups of more than an order of magnitude were obtained when the protocol was implemented within ISIS. One conclusion is that systems such as ISIS can achieve performance competitive with the best existing multicast facilities - a finding contradicting the widespread concern that fault-tolerance may be unacceptably costly.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-186495 , NAS 1.26:186495 , AD-A220910
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Multichannel astrometric photometer and photographic astrometric studies in the regions of Lalande 21185, BD 56 deg 2966, and HR 4784 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The parallaxes of stars determined from the multichannel astrometric photometer (MAP) in the regions of Lalande 21185, BD 56 deg 2966, and from photographic plates in the region of BD 56 deg 2966 and the region of HR 4783 and HR 4784 are reported. The parallax determined for Lalande 21185, 395.1 +/-1.0 mas yields what is believed to be the most precise distance modulus (-2.984 +/-0.0055) known for a star other than the sun. The absolute magnitude of Lalande 21185 is found to be 10.474 +/-0.008. No significant evidence of unseen companions is detected. The photographic study of BD 56 deg 2966 indicates that the long-term (65 yr) motion of the star is linear to better than +/-16 mas, while the MAP study indicates that the motion is linear to better than +/-2.5 mas over a period of some 5 yr. The photographically determined parallaxes are compared with those observed with the MAP. The photographically calculated standard errors are found to be in agreement with the standard error of the differences.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 104; 3 Se; 1237-124
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Installing scientific instruments into a cold LHe dewar - The Gravity Probe B approach (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Gravity Probe B is an orbital test of Einstein's general theory of relativity using gyroscopes. The precession of the gyroscopes will measure both the geodetic effect (6.6 arcsec/yr) through the curved space-time surrounding the earth and the motional effect (0.042 arcsec/yr) due to the rotating earth dragging space-time around with it. To achieve the extraordinary accuracies needed to measure these small precessions, it is necessary to have the gyroscopes operating in the following environments: a vacuum of less than 10 exp -10 torr; an acceleration level of less than 10 exp -10 g's; a magnetic field of less than 10 exp -7 gauss; and a temperature near 2 K. This paper discusses designs that allow scientific instruments to be installed into a dewar at 4.2 K. Methods for structurally supporting the instruments, transferring heat across joints at low temperature in vacuum, and excluding air during the insertion process are discussed. The structural support method is designed for Shuttle launch loads.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: 1989 Cryogenic Engineering Conference; Jul 24, 1989 - Jul 28, 1989; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The NASA Telerobotics Research Program (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An account is given to NASA efforts in the development of space telerobotics, which encompass mission analyses, core technology research, systems-integration testbed evaluations, ground-based demonstrations, and flight experiments. Space telerobotics applications encompass (1) The Space Shuttle Satellite Servicing System, (2) the Space Shuttle Orbiter's Remote Manipulator System, (3) the Space Station Freedom's Flight Telerobotics Servicer, Mobile Servicing Center, and Japanese Experiment Module, and (4) planetary rovers. A fundamental role is being played by NASA-Marshall, which possesses a Teleoperator and Robotics Evaluation Facility.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: IFAC Symposium; Jul 17, 1989 - Jul 21, 1989; Tsukuba; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The NASA-OAST earth-to-orbit propulsion technology program - The action plan (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The paper discusses the primary objective of the NASA-OAST earth-to-orbit (ETO) propulsion technology program, namely, to completely overhaul the nation's liquid rocket design and analysis capabilities which were found to be severely limited when used for the design and development of the Space Shuttle Main Engine (SSME). Meeting this objective is to provide a much sounder, very comprehensive technology base that will enable the cost-effective low-risk development, acquisition, and operation of high-performance, expendable, or reusable ETO propulsion systems. This in turn will enable the future development of space transportation system launch vehicles with greatly reduced life-cycle costs. Work is carried out in three major areas: combustion devices, turbomachinery, and controls and health management.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 92-1478
    Format: text
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    NASA TECHNICAL REPORTS
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