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  • BIOTECHNOLOGY  (9)
  • INSTRUMENTATION AND PHOTOGRAPHY  (5)
  • 1970-1974  (14)
  • 1950-1954
  • 1
    Publication Date: 2005-11-27
    Description: Reliability, weight, size, and power supplies as factors in designing microwave ovens for spacecraft
    Keywords: BIOTECHNOLOGY
    Type: NASA, WASHINGTON AEROSPACE FOOD TECHNOL. 1970; P 175-176
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  • 2
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    In:  CASI
    Publication Date: 2006-01-11
    Description: The unique characteristics of artificial gravity that affect human performance and physiology in an artificial gravity environment are reviewed. The rate at which these unique characteristics change decreases very rapidly with increasing radius of a rotating vehicle used to produce artificial gravity. Reducing their influence on human performance or physiology by increasing radius becomes a situation of very rapidly diminishing returns. A review of several elements of human performance has developed criteria relative to the sundry characteristics of artificial gravity. A compilation of these criteria indicates that the maximum acceptable rate of rotation, leg heaviness while walking, and material handling are the factors that define the minimum acceptable radius. The ratio of Coriolis force to artificial weight may also be significant. Based on current knowledge and assumptions for the various criteria, a minimum radius between 15.2 and 16.8 m seems desirable.
    Keywords: BIOTECHNOLOGY
    Type: Fifth Symp. on the Role of the Vestibular Organs in Space Exploration; p 23-33
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  • 3
    Publication Date: 2011-08-16
    Description: Ion acoustic waves propagation and structure measurements with metal electrode technique and continuous channel electron multiplier in plasma wind tunnel
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; ADEMIE DES SCIENCES
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  • 4
    Publication Date: 2011-08-16
    Keywords: BIOTECHNOLOGY
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  • 5
    Publication Date: 2016-06-07
    Description: The methods of synchronizing precision clocks will be reviewed placing particular attention to the simpler techniques, their accuracies, and the approximate cost of equipment. The more exotic methods of synchronization are discussed in lesser detail. The synchronization techniques that will be covered will include satellite dissemination, communication and navigation transmissions via VLF, LF, HF, UHF and microwave as well as commercial and armed forces television. Portable clock trips will also be discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Proc. of the Sixth Ann. Precise Time and Time Interval (PTTI) Planning Meeting; p 29-37
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  • 6
    Publication Date: 2019-06-27
    Description: Preliminary observations of cardiovascular function have been made in four chimpanzees using multichannel implantable units. Measurements of right- and left-sided pressures were periodically made in these animals over a four-month period, including continuous observations for selected 24-hour periods. Pressures recorded with animals in an awake, unanesthetized, unrestrained state were much lower than pressures reported for restrained animals in similar situations. Diurnal variations of pressure tended to occur, but were not as clear-cut as those reported to occur for humans. The ability to implant a transmitter chronically and receive useful multichannel information in the chimpanzee encourages the future use of such implant devices as part of the control system for an artificial heart or directly for use in man.
    Keywords: BIOTECHNOLOGY
    Type: Circulation Research; 31; Sept
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  • 7
    Publication Date: 2019-06-27
    Description: Detailed laboratory measurement of the electron response of solid state detectors as a function of incident electron energy, detector depletion depth, and energy-loss discriminator threshold. These response functions were determined by exposing totally depleted silicon surface barrier detectors with depletion depths between 50 and 1000 microns to the beam from a magnetic beta-ray spectrometer. The data were extended to 5000 microns depletion depth using the results of previously published Monte Carlo electron calculations. When the electron counting efficiency of a given detector is plotted as a function of energy-loss threshold for various incident energies, the efficiency curves are bounded by a smooth envelope which represents the upper limit to the detection efficiency. These upper limit curves, which scale in a simple way, make it possible to easily estimate the electron sensitivity of solid-state detector systems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NSSDC-ID-69-051A-20-PS , Nuclear Instruments and Methods; 98; Jan. 197
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  • 8
    Publication Date: 2019-06-27
    Description: Laboratory measurements have been made of the response of two typical cosmic ray detector systems to electrons between 0.2 and 2.0 MeV. Working laboratory versions of each of these particle telescopes were exposed to the monoenergetic electron beam from a magnetic spectrometer. The results of pulse height and counting rate measurements indicate that electrons scattered from the anticoincidence cup comprise about 25% of the total number arriving at the top of the detector stack. In certain cases, the contribution of these scattered particles to the total number of electrons detected can reach 65%.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NSSDC-ID-67-073A-08-PS , NSSDC-ID-69-051A-20-PS
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  • 9
    Publication Date: 2019-06-27
    Description: The Langley six degree of freedom visual motion simulator has been used to measure subjective response ratings of the ride quality of eight segments of flight, representative of a wide variation in comfort estimates. The results indicate that the use of simulators for this purpose appears promising. A preliminary approach for the development of criteria for ride quality ratings based on psychophysical precepts is included.
    Keywords: BIOTECHNOLOGY
    Type: NASA-TM-X-71922 , L-9296
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  • 10
    Publication Date: 2019-06-27
    Description: Previous studies in man and dogs have indicated that the splanchnic bed might contribute to the maintenance of arterial pressure during +Gx acceleration. Eight mongrel dogs were chronically instrumented with Doppler flow probes around the superior mesenteric (SMA) and renal arteries (RA) as well as the terminal aorta (TA). A solid-state pressure transducer was placed in the aorta distal to the flow probe. Using alpha-chloralose anesthesia following a 2-4 week recovery period, the animals were subjected to 120 sec at levels of 5, 10 and 15 +Gx acceleration on a 7.6-m radius centrifuge. The results indicate that both an active component and a mechanical component contribute to the maintenance of arterial pressure during +Gx acceleration.
    Keywords: BIOTECHNOLOGY
    Type: Aerospace Medicine; 45; May 1974
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