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  • SPACE RADIATION  (95)
  • PROPULSION SYSTEMS  (54)
  • ASTROPHYSICS
  • MACHINE ELEMENTS AND PROCESSES
  • 1970-1974  (193)
  • 1955-1959  (2)
  • 1972  (193)
  • 1955  (2)
Collection
Keywords
Years
  • 1970-1974  (193)
  • 1955-1959  (2)
Year
  • 1
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    Search for antimatter in primary cosmic rays. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Data from two flights of a new superconducting magnetic spectrometer are reported. This instrument was capable of a direct matter-antimatter separation in the cosmic rays. Antimatter events would appear in the spectrometer as trajectories which curve in the opposite direction to common matter, because of their negative charge. A brief description of the equipment and of the characteristics of the instrument is presented, along with the data processing techniques used. A new upper limit on the amount of antimatter in primary cosmic rays has been established. The limits are considerably lower than those for any previous experiment.
    Keywords: SPACE RADIATION
    Type: Nature; 236; Apr. 14
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Origin of 200-keV interplanetary electrons. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The suggestion by Lin et al. (1972) that a distinct spectral feature exists at about 200 keV, which could be due to a neutron-decay electron component of either solar or galactic origin, is examined. Alternative sources models, including production by nearby galactic objects or acceleration at the outer boundary of the solar system, are also considered.
    Keywords: SPACE RADIATION
    Type: Physical Review Letters; 29; Oct. 9
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Teleoperators for remote operations in space (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The primary objective of the remote nuclear teleoperator study program was to define in detail a program plan which would provide a qualified operational space teleoperator system by about 1980. The concept and philosophy presented provides a product considered to be an advanced teleoperator when compared to today's state-of-the-art. The teleoperator concept is formulated to meet NERVA requirements.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA, Washington Proc. of the Natl. Symp. on Nat. and Manmade Radiation in Space; p 277-279
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The cosmic gamma-ray spectrum between 0.3 and 27 MeV measured on the Apollo 15 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The spectrum of the total (diffuse and discrete sources) cosmic gamma-ray background over the 0.3 to 27 MeV range was measured with a 7.0 cm diameter x 7.0 cm long uncollimated NaI(Tl) scintillation counter located on a boom 7.6 m from the Apollo 15 service module. Data on cosmic gamma-rays were taken during transearth coast at various boom extensions, detector gains, and with the plastic anticoincidence scintillator enabled and disabled.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-66104 , X-641-72-421
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Quasi-one-dimensional compressible flow across face seals and narrow slots. 1: Analysis (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An analysis is presented for compressible fluid flow across shaft face seals and narrow slots. The analysis includes fluid inertia, viscous friction, and entrance losses. Subsonic and choked flow conditions can be predicted and analyzed. The model is valid for both laminar and turbulent flows. Results agree with experiment and with solutions which are more limited in applicability. Results show that a parallel film can have a positive film stiffness under choked flow conditions.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-6668 , E-6819
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Upper-stage space shuttle propulsion by means of separate scramjet and rocket engines (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A preliminary mission study of a reusable vehicle from staging to orbit indicates payload advantages for a dual-propulsion system consisting of separate scramjet and rocket engines. In the analysis the scramjet operated continuously and the initiation of rocket operation was varied. For a stage weight of 500,000 lb the payload was 10.4 percent of stage weight or 70 percent greater than that of a comparable all-rocket-powered stage. When compared with a reusable two-state rocket vehicle having 50,000 lb payload, the use of the dual propulsion system for the second stage resulted in significant decreases in lift-off weight and empty weight, indicating possible lower hardware costs.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TN-D-6762 , E-6555
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Soft X-rays from the vicinity of the North Polar Spur. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Soft X rays in the energy regions below 284 eV and between 500 and 1000 eV have been detected on the vicinity of the North Polar Spur. The region of enhanced X-ray emission reported was observed from an Aerobee 150 rocket launched on May 29, 1970, from Woomera, Australia.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 172; Mar. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Solar-wind structure determined by corotating coronal inhomogeneities. II - Arbitrary perturbations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The problem of the solar-wind structure resulting from long-lived inhomogeneities in the solar corona has been extended within the framework of a linearized hydrodynamic approach to allow for arbitrary perturbations in the plasma parameters, namely, velocity, density, and temperature. By using a Parker model for the zero-order flow speed, solutions are given for perturbations imposed at the zero-order critical point. Using the restriction that the solutions must be regular at the critical point, it is possible to express all situations as a linear sum of the solutions for pure velocity, density, and temperature perturbations at the critical point. The results of the integrations for three inner-boundary conditions can be used as the elements of matrices that map arbitrary perturbations at one heliocentric distance to any other distance. One interesting feature of the solutions is that the amplitudes at earth for the pure initial temperature situation are larger than for the other two situations.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 77; Jan. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Electromagnetic free suspension system for space manufacturing. Volume 1: Technology department (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The technology developed in defining a facility to be used on the Skylab mission for electromagnetic suspension of small, molten spheres in the weightless space environment is described. The technologies discussed include: four-coil optimization, four-coil versus six-coil configuration comparison, four-coil position servocontrol, four-coil breadboard, position sensing and servosystem, two-color pyrometer, and specimen toration mode analysis.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-124134
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Design study of shaft face seal with self-acting lift augmentation. 4: Force balance (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for predicting the operating film thickness of self-acting seals is described. The analysis considers a 16.76-cm mean diameter seal that is typical of large gas turbines for aircraft. Four design points were selected to cover a wide range of operation for advanced engines. This operating range covered sliding speeds of 61 to 153 m/sec, sealed pressures of 45 to 217 N/sq cm abs, and gas temperatures of 311 to 977 K. The force balance analysis revealed that the seal operated without contact over the operating range with gas film thicknesses ranging between 0.00046 to 0.00119 cm, and with gas leakage rates between 0.01 to 0.39 scmm.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-6568 , E-6458
    Format: application/pdf
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