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  • AIRCRAFT PROPULSION AND POWER  (73)
  • BIOSCIENCES
  • Meteorology and Climatology
  • 2005-2009
  • 1975-1979  (58)
  • 1970-1974  (54)
  • 1950-1954
  • 1978  (58)
  • 1974  (54)
Collection
Keywords
Years
  • 2005-2009
  • 1975-1979  (58)
  • 1970-1974  (54)
  • 1950-1954
Year
  • 1
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    Auditory and visual evoked potentials during hyperoxia (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Experimental study of the auditory and visual averaged evoked potentials (AEPs) recorded during hyperoxia, and investigation of the effect of hyperoxia on the so-called contingent negative variation (CNV). No effect of hyperoxia was found on the auditory AEP, the visual AEP, or the CNV. Comparisons with previous studies are discussed.
    Keywords: BIOSCIENCES
    Type: Electroencephalography and Clinical Neurophysiology; 37; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    F100(3) parallel compressor computer code and user's manual (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Pratt & Whitney Aircraft multiple segment parallel compressor model has been modified to include the influence of variable compressor vane geometry on the sensitivity to circumferential flow distortion. Further, performance characteristics of the F100 (3) compression system have been incorporated into the model on a blade row basis. In this modified form, the distortion's circumferential location is referenced relative to the variable vane controlling sensors of the F100 (3) engine so that the proper solution can be obtained regardless of distortion orientation. This feature is particularly important for the analysis of inlet temperature distortion. Compatibility with fixed geometry compressor applications has been maintained in the model.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-135388 , PWA-5549-8
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of 14 days of bed rest on urine metabolite excretion and plasma enzyme levels (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: After 1 week of ambulatory base-line measurement, a group of 8 men 19-26 years of age remained continuously recumbent for 14 days. Studies were continued for 1 week following the prolonged recumbency. Urine excretion rates for a number of constituents were determined 2 days before bed rest, on day 14 of bed rest, and day 6 after bed rest. Blood plasma samples were also obtained at these times, and analyzed for several enzymes. On day 14 of bed rest significant increases were observed in urine excretion of total osmotically-active substances, magnesium, calcium, phosphate, creatinine, hydroxyproline, and 17-OH corticosteroids. A decrease occurred in urinary glucose excretion. Plasma levels of alkaline phosphatase and LDH-3 were depressed, while plasma GPT was elevated. Many of these changes persisted on day 6 after bed rest, and are interpreted as concomitants of the disuse atrophy of the musculoskeletal system that characterizes prolonged bed rest and weightlessness.
    Keywords: BIOSCIENCES
    Type: Plenary Meeting; Jun 17, 1974 - Jul 01, 1974; Sao Paulo; Brazil
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Variable mixer propulsion cycle (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A design technique, method and apparatus are delineated for controlling the bypass gas stream pressure and varying the bypass ratio of a mixed flow gas turbine engine in order to achieve improved performance. The disclosed embodiments each include a mixing device for combining the core and bypass gas streams. The variable area mixing device permits the static pressures of the core and bypass streams to be balanced prior to mixing at widely varying bypass stream pressure levels. The mixed flow gas turbine engine therefore operates efficiently over a wide range of bypass ratios and the dynamic pressure of the bypass stream is maintained at a level which will keep the engine inlet airflow matched to an optimum design level throughout a wide range of engine thrust settings.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Reliability of laboratory tests of VSTOL and other long duration noises (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Paired-comparison and magnitude estimations of the subjective noisiness or unacceptability of noise from fixed wing jet aircraft and simulated noise of VSTOL aircraft were obtained from groups of subjects given different instructions. These results suggest that VSTOL noises can be evaluated in terms of their noisiness or unwantedness to people with reasonable accuracy by units of the physical measures designated as PNdBM, with or without tone corrections, and dBD sub 2. Also, that consideration should be given to the use of D sub 2 as an overall frequency weighting function for sound level meters instead of the presently available A weighting. Two new units of noise measurement, PLdB and dB(E), used for predicting subjective noisiness, were found to be less accurate than PNdBM or dBD sub 2 in this regard.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-2471
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Space psychology (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Psychological selection of astronauts considers mental responses and adaptation to the following space flight stress factors: (1) confinement in a small space; (2) changes in three dimensional orientation; (3) effects of altered gravity and weightlessness; (4) decrease in afferent nerve pulses; (5) a sensation of novelty and danger; and (6) a sense of separation from earth.
    Keywords: BIOSCIENCES
    Type: Inhabited Space, Pt. 2 (NASA-TT-F-820); p 29-41
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Alterations in left ventricular volumes induced by Valsalva manoeuvre (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Five patients were studied with left ventriculography during different phases of the Valsalva manoeuvre. Small doses of contrast medium allowed adequate repetitive visualization of the left ventricle for volume calculation. During strain phase, the volume of the left ventricle decreased by nearly 50 per cent in each case, and stroke volume and cardiac output also dropped strikingly. Release of straining was attended by a sharp rebound of left ventricular volume to control levels, with a transient surge of increased cardiac output 42 per cent above that of the resting state.
    Keywords: BIOSCIENCES
    Type: British Heart Journal; 36; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Serotonin and pituitary-adrenal function (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An investigation is conducted to evaluate the response of the pituitary-adrenal system to a stress stimulus in the rat. In the investigation brain serotonin synthesis was inhibited with p-chlorophenylalanine. In other tests the concentration of serotonin was enhanced with precursors such as tryptophan or 5-hydroxytryptophan. On the basis of the results obtained in the study it is speculated that in some disease states there is a defect in serotonergic neuronal processes which impairs pituitary-adrenal feedback mechanisms.
    Keywords: BIOSCIENCES
    Type: Nature; 248; Mar. 29
    Format: text
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  • 9
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    Life span and fine structural changes in oxygen-poisoned drosophila melanogaster (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: BIOSCIENCES
    Type: Aerospace Medicine; 45; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Method of magnetobiological indication in clinical laboratory practice (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Data are presented on the use of the method of magnetobiological indication for defining the immunobiological state of patients with very serious diseases. It has been found that the enzymes of a patient react more sensitively to the energy from a magnetic field. It is important that the magnetoreactivity of the enzymes, like the cell forms of the blood in the patients, have a certain relationship to the clinical-nosological forms and the dynamics of the illness of the subject.
    Keywords: BIOSCIENCES
    Type: Studies in Geomagnetism, Aeronomy and Solar Phys. (NASA-TT-F-15862); p 129-140
    Format: text
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