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  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Obtaining high-strength weldable steels with bainite structure using thermomechanical treatment (1994)
    Springer
    Metal science and heat treatment 36 (1994), S. 532-538 
    Details
    ISSN: 1573-8973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, we present the results of investigations which form the basis for development of high-strength weldable bainite steels obtained using in-line thermomechanical treatment in the rolling mill and not requiring heat treatment with special heating. The thennomechanical treatment involves controlled rolling followed by regulated cooling. In order to achieve high strength properties than in steels with ferrite—pearlite structure, the alloying and cooling conditions for rolling in the thermomechanical treatment cycle must ensure that lowtemperature austenite transformation products be obtained with a fine original austenite grain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01398082
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    Paper (German National Licenses)
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  • 2
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    Orbit determination support for Hiten's aerobraking in the Earth's atmosphere (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Two passes of the ISAS (Japan's Institute of Space and Astronautical Science) Hiten spacecraft through the Earth's atmosphere, at perigee altitudes of 125 km and 120 km, during Mar. 1991 marked the first aerobraking technology demonstrations for an object in cis-lunar orbit traveling at near Earth escape velocity. Prediction and control of perigee altitude to better than 1 km was desired to assure spacecraft survival. Covariance analysis provided confidence that prediction accuracy better than 200 m for support of final trim maneuver design was achievable with NASA DSN (Deep Space Network) tracking support. ISAS used orbit determination results in their decisions to cancel final trim maneuvers. Post flight reconstructions, marking the first combined use of DSN and ISAS tracking data, yielded perigee altitude solutions which agree with the near real time mission operations support predictions to better than 50 m.
    Keywords: ASTRODYNAMICS
    Type: ESA, Spacecraft Flight Dynamics; p 141-147
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Navigation for Muses-A (HITEN) aerobraking in the earth's atmosphere - Preliminary report (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Aerobraking phase covariance study results and preliminary joint JPL/ISAS orbit determination findings are presented. Possible explanations for differences in the JPL and ISAS perigee altitude results are discussed. Agreement between predicted and reconstructed values for the altitude and time of perigee passage attests to the accuracy of the JPL orbit solutions.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Annual Meeting of the Institute of Navigation; Jun 10, 1991 - Jun 12, 1991; Williamsburg, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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