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  • Other Sources  (11)
  • GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)  (5)
  • PROPELLANTS AND FUELS  (4)
  • ASTROPHYSICS  (2)
  • 1985-1989  (11)
  • 1988  (11)
  • 1
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    On the universality of the two-point galaxy correlation function (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The behavior of the two-point galaxy correlation function in volume-limited subsamples of three complete redshift surveys is investigated. The correlation length is shown to scale approximately as the square root of the distance limit in both the CfA and Southern Sky catalogs, but to be independent of the distance limit in the IRAS sample. This effect is found to be due to factors such as the large positive density fluctuations in the foreground of the optically selected catalogs biasing the correlation length estimate downward, and the brightest galaxies appearing to be more strongly clustered than the mean.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 333; L9-L12
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  • 2
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    A diffuse reflectance infrared Fourier transform spectroscopic study of adsorbed hydrazines (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Diffuse reflectance spectroscopy of fuel hydrazines adsorbed on silica, silica-alumina and alimina surfaces indicates that the primary surface-hydrazine interaction is hydrogen bonding. Hydrazine, on adsorption to a deuterated silica surface, undergoes a rapid H/D exchange with deuterated surface silanol (Si-OD) groups. Adsorption equilibria are rapidly established at room temperature. Monomethylhydrazine and unsymmetrical dimethylhydrazine are similarly adsorbed. On adsorption, the C-H stretching and methyl deformation modes of the methylhydrazines are shifted to higher frequencies by 10 to 20 cm(-1). These shifts are postulated to be due to changes in the lone-pair electro-density on the adjacent nitrogen atom and an electronegativity effect.
    Keywords: PROPELLANTS AND FUELS
    Type: Hazardous Materials Technical Center, The Third Conference on the Environmental Chemistry of Hydrazine Fuels; p 154-166
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  • 3
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    Surface-catalyzed air oxidation reactions of hydrazines: Tubular reactor studies (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The surface-catalyzed air oxidation reactions of hydrazine, monomethylhydrazine, unsymmetrical dimethylhydrazine, symmetrical dimethylhydrazine, trimethylhydrazine and tetramethylhydrazine were investigated in a metal-powder packed turbular flow reactor at 55 plus or minus 3 C. Hydrazine was completely reacted on all surfaces studied. The major products of monomethylhydrazine (MMH) oxidation were methanol, methane and methyldiazene. The di-, tri- and tetra-methyl hydrazines were essentially unreactive under these conditions. The relative catalytic reactivities toward MMH are: Fe greater than Al2O3 greater than Ti greater than Zn greater than 316 SS greater than Cr greater than Ni greater than Al greater than 304L SS. A kinetic scheme and mechanism involving adsorption, oxidative dehydrogenation and reductive elimination reactions on a metal oxide surface are proposed.
    Keywords: PROPELLANTS AND FUELS
    Type: Hazardous Materials Technical Center, The Third Conference on the Environmental Chemistry of Hydrazine Fuels; p 128-137
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  • 4
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    An atmospheric pressure flow reactor: Gas phase kinetics and mechanism in tropospheric conditions without wall effects (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A new type of gas phase flow reactor, designed to permit the study of gas phase reactions near 1 atm of pressure, is described. A general solution to the flow/diffusion/reaction equations describing reactor performance under pseudo-first-order kinetic conditions is presented along with a discussion of critical reactor parameters and reactor limitations. The results of numerical simulations of the reactions of ozone with monomethylhydrazine and hydrazine are discussed, and performance data from a prototype flow reactor are presented.
    Keywords: PROPELLANTS AND FUELS
    Type: Hazardous Materials Technical Center, The Third Conference on the Environmental Chemistry of Hydrazine Fuels; p 50-65
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  • 5
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    Surface-catalyzed air oxidation of hydrazines: Environmental chamber studies (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The surface-catalyzed air oxidation reactions of fuel hydrazines were studied in a 6500-liter fluorocarbon-film chamber at 80 to 100 ppm concentrations. First-order rate constants for the reactions catalyzed by aluminum, water-damaged aluminum (Al/Al2O3), stainless steel 304L, galvanized steel and titanium plates with surface areas of 2 to 24 sq m were determined. With 23.8 sq m of Al/Al2O3 the surface-catalyzed air oxidation of hydrazine had a half-life of 2 hours, diimide (N2H2) was observed as an intermediate and traces of ammonia were present in the final product mixture. The Al/Al2O3 catalyzed oxidation of monomethylhydrazine yielded methyldiazine (HN = NCH3) as an intermediate and traces of methanol. Unsymmetrical dimethylhydrazine gave no detectable products. The relative reactivities of hydrazine, MMH and UDMH were 130 : 7.3 : 1.0, respectively. The rate constants for Al/Al2O3-catalyzed oxidation of hydrazine and MMH were proportional to the square of the surface area of the plates. Mechanisms for the surface-catalyzed oxidation of hydrazine and diimide and the formation of ammonia are proposed.
    Keywords: PROPELLANTS AND FUELS
    Type: Hazardous Materials Technical Center, The Third Conference on the Environmental Chemistry of Hydrazine Fuels; p 38-49
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  • 6
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    Shuttle Orbiter arrestment system studies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Scale model studies of the Shuttle Orbiter arrestment system were conducted to determine the proper net arrestment system configuration to bring the Orbiter to a safe stop in the event of a runway overshoot. Areas of interest include the effect of various net geometries on net engagement of the nose gear and main gear; and whether or not the top bundle contacts the crew cabin window. The model tests indicated that the net arrestment system was properly designed to bring the Orbiter to a safe stop with minimal amount of damage. The test procedures and data are presented.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: SAE PAPER 881361
    Format: text
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  • 7
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    Research in particle and gamma-ray astrophysics (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research activities in cosmic rays, gamma rays, and astrophysical plasmas are covered. Each activity is described, followed by a bibliography. The research program is directed toward the investigation of the astrophysical aspects of cosmic rays and gamma rays and of the radiation and electromagnetic field environment of the earth and other planets. These investigations were performed by means of energetic particle and photon detector systems flown on spacecraft and balloons.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-183126 , NAS 1.26:183126
    Format: application/pdf
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  • 8
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    The use of force feedback control for robotic mating of umbilical fuel lines (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Control problems in developing force feedback control to use in remotely connecting, disconnecting, and reconnecting the umbilical fuel lines of the Space Shuttle Vehicle are discussed. A docking protocol is proposed, indicating the required role of force feedback. The use of active force feedback control is examined and performance requirements and experimental results are given. A single degree-of-freedom force feedback model is presented and the application of classical control compensation techniques to the force control loop to increase flexibility is considered. In addition, possible modifications to the controller and plans for future research are discussed.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Space Congress; Apr 26, 1988 - Apr 29, 1988; Cocoa Beach, FL; United States
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  • 9
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    Systems integration for the Kennedy Space Center (KSC) Robotics Applications Development Laboratory (RADL) (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A laboratory for developing robotics technology for hazardous and repetitive Shuttle and payload processing activities is discussed. An overview of the computer hardware and software responsible for integrating the laboratory systems is given. The center's anthropomorphic robot is placed on a track allowing it to be moved to different stations. Various aspects of the laboratory equipment are described, including industrial robot arm control, smart systems integration, the supervisory computer, programmable process controller, real-time tracking controller, image processing hardware, and control display graphics. Topics of research include: automated loading and unloading of hypergolics for space vehicles and payloads; the use of mobile robotics for security, fire fighting, and hazardous spill operations; nondestructive testing for SRB joint and seal verification; Shuttle Orbiter radiator damage inspection; and Orbiter contour measurements. The possibility of expanding the laboratory in the future is examined.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Space Congress; Apr 26, 1988 - Apr 29, 1988; Cocoa Beach, FL; United States
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  • 10
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    Space Shuttle solid rocket motor testing for return to flight (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Significant design changes made to major components of the NASA Space Shuttle SRM are summarized. The extent of changes made in the nozzle-to-case joint to better protect the joint O-ring seals is indicated schematically as are changes made to the motor nozzle. It is noted that the use of subscale, full scale/short duration burn hardware tests to provide data for structural and thermal analytical models was necessary.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Aerospace Testing Seminar; Oct 11, 1988 - Oct 13, 1988; Manhattan Beach, CA; United States
    Format: text
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