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  • INSTRUMENTATION AND PHOTOGRAPHY  (119)
  • AERODYNAMICS  (60)
  • PROPULSION SYSTEMS  (52)
  • MACHINE ELEMENTS AND PROCESSES  (46)
  • ASTROPHYSICS
  • 1970-1974  (277)
  • 1955-1959
  • 1972  (277)
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Keywords
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  • 1970-1974  (277)
  • 1955-1959
Year
  • 1
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    Reference data for thermocouple materials below the ice point. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Standard thermoelectric data have been determined for four thermocouple combinations used below the ice point: commercial types E, K, and T and the special combination of KP vs Au-0.07 at.% Fe. Power series coefficients necessary to generate E = f(T) data for these combinations are given. In addition, extensive tests were carried out to ascertain the variability between materials from different manufacturers. Typical wires processed for low-temperature usage often have slightly thermoelectric properties (up to 1%) from those, nominally identical, wires made for high-temperature applications. Generally, type E is the most satisfactory standardized commercial combination. The Au-0.07 at.% Fe material has been examined in particular detail, because it is not yet an ISA standard material. It has excellent sensitivity in the liquid helium/liquid hydrogen temperature range and a nearly linear thermovoltage at higher temperatures.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Symposium on Temperature; Jun 21, 1971 - Jun 24, 1971; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Calibration of capsule platinum resistance thermometers at the triple point of water. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Symposium on Temperature; Jun 21, 1971 - Jun 24, 1971; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Astronomical photography, part T (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Photographic observations of astronomical interest conducted during the Apollo 15 mission are discussed. Procedures used in photographing the solar corona are described together with calibration and reduction methods. In addition, selected preliminary results obtained from the photography are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Its Apollo 15 Prelim. Sci. Rept.; 39 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Neutral-particle wake method for measuring the atmospheric temperature from a satellite. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Description of a method that would permit a satellite-borne neutral mass spectrometer to measure the atmospheric temperature. The spectrometer examines the partial pressure variations that occur as the wake of a small rectangular baffle is swept across the entrance orifice of the spectrometer. For a given baffle size and for a mounting distance from the orifice, the depth of the resulting pressure minimum depends only on the thermal velocity or temperature of the observed species. The validity of the method can be checked by measuring the wake characteristics of more than one species and/or by employing each of several baffle sizes. The theory includes the effect of a finite orifice size, finite baffle length, and the backscattering of particles from the baffle into the orifice. It is found that a suitable baffle arrangement can be achieved that will permit the temperature to be measured over at least the range normally encountered in the thermosphere (200 to 2000 K) and, depending on the sensitivity and background pressure of the spectrometer, over an altitude range of about 140 to 600 km.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Geophysical Research; 77; Apr. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Measurements of ultrasonic velocities using a digital averaging technique. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A new pulse-echo technique using real-time digital averaging is described for measuring the phase velocity in solids up to 50 MHz. The technique can measure the transit time between any two echoes to an absolute accuracy of 0.1 nsec and measure small changes in transit time to a sensitivity of 20 psec. Experimental examples are given based upon ultrasonic velocity measurements in a single crystal superconductor.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Acoustical Society of America; vol. 52
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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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
  • 7
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    An electronically gated gamma and X-ray calibration scheme. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The construction and use are described for a radioactive calibration source that produces an electronic gating pulse when a calibration gamma ray is emitted and makes it possible to employ this source in many calibration or stabilizing tasks without the disadvantage of having to introduce extra counts into the unknown spectrum. The described source is radioactively safe, easy to construct, and has the ability of producing gating efficiencies as high as 98%.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Nuclear Instruments and Methods; 101; 1972
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    NASA TECHNICAL REPORTS
  • 8
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    Design of the solar X-ray instrument for OSO-H. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The OSO-H solar X-ray instrument monitors X rays from the sun in the energy range 1-300 keV, as well as the charged particle background. The electronics provide accurate logarithmic pulse-height analysis at the high counting rates expected under flare conditions. A high time resolution mode enables tudy the temporal development of a solar flare.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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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
  • 10
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    Safe atmosphere entry of an isotope heat source with a single stable trim attitude at hypersonic speeds (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A theoretical investigation has been made to design an isotope heat source capable of satisfying the conflicting thermal requirements of steady-state operation and atmosphere entry. The isotope heat source must transfer heat efficiently to a heat exchange during normal operation with a power system in space, and in the event of a mission abort, it must survive the thermal environment of atmosphere entry and ground impact without releasing radioactive material. A successful design requires a compatible integration of the internal components of the heat source with the external aerodynamic shape. To this end, configurational, aerodynamic, motion, and thermal analyses were coupled and iterated during atmosphere entries at suborbital through superorbital velocities at very shallow and very steep entry angles. Results indicate that both thermal requirements can be satisfied by a heat source which has a single stable aerodynamic orientation at hypersonic speeds. For such a design, the insulation material required to adequately protect the isotope fuel from entry heating need extend only half way around the fuel capsule on the aerodynamically stable (wind-ward) side of the heat source. Thus, a low-thermal-resistance, conducting heat path is provided on the opposite side of the heat source through which heat can be transferred to an adjacent heat exchanger during normal operation without exceeding specified temperature limits.
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-6833 , A-4342
    Format: application/pdf
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