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  • Chemistry  (19)
  • AERODYNAMICS  (10)
  • AEROSPACE MEDICINE  (8)
  • 1985-1989  (20)
  • 1975-1979  (17)
  • 1
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    Effect of prolonged space flight on cardiac function and dimensions (1977)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: By taking advantage of the capabilities of echocardiography to measure noninvasively left ventricular volume, stroke volume, and ejection fraction, and of the fact that the astronauts were routinely subjected to lower body negative pressure (whereby cardiac filling is progressively decreased), it was possible to construct classic ventricular function curves noninvasively, thereby obviating the difficulties encountered in comparing cardiac function at different end-diastolic volumes preflight and postflight. In this manner, the effect of an 84-day period of weightlessness on cardiac structure and function was evaluated in the Skylab 4 astronauts.
    Keywords: AEROSPACE MEDICINE
    Type: NASA., JSC Biomed. Results from Skylab; p 366-371
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  • 2
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    Rotor wake characteristics of a transonic axial-flow fan (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 1802-181
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  • 3
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    Vortex shedding in high-speed compressor blade wakes (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The wakes of highly loaded compressor blades are generally considered to be turbulent flows. Recent work has suggested that the blade wakes are dominated by a vortex streetlike structure. The experimental evidence supporting the wake vortex structure is reviewed. This structure is shown to redistribute thermal energy within the flowfield. The effect of the wake structure on conventional aerodynamic measurements of compressor performance is noted. A two-dimensional, time-accurate, viscous numerical simulation of the flow exhibits both vortex shedding in the wake and a lower-frequency flow instability that modulates the shedding. The numerical results are shown to agree quite well with the measurement from transonic compressor rotors.
    Keywords: AERODYNAMICS
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 4; 236-244
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  • 4
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    Studies of acid-base homeostasis during simulated weightlessness: Application of the water immersion model to man (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The effects of water immersion on acid-base homeostasis were investigated under carefully controlled conditions. Studies of renal acidification were carried out on seven healthy male subjects, each consuming a diet containing 150 meq sodium and 100 meq potassium. Control and immersion studies were carried out on each subject on the fourth and sixth days, respectively, of dietary equilibration, by which time all subjects had achieved sodium balance. The experimental protocols on study days were similar (except for the amount of water administered).
    Keywords: AEROSPACE MEDICINE
    Type: NASA. Johnson Space Center Proc. of the 1973 JSC Endocrine Program Conf.; 11 p
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  • 5
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    Active suppression of compressor instabilities (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A strategy is proposed for controlling aerodynamic instabilities which limit the useful range of both axial and centrifugal turbomachines. Both local and global instabilities (incipient rotating stall and surge) are analyzed. A theory is developed which shows how an additional disturbance, driven from real time data measured within the machine, can be generated so as to realize a device with characteristics fundamentally different from those of the turbomachine without control; for the particular compressor analyzed, the control led to a 20 percent increase in the extent of the stable operating range. The use of structural dynamics to enhance stability is also discussed.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-1914
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  • 6
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    Rotor wake characteristics of a transonic axial flow fan (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: State of the art turbomachinery flow analysis codes are not capable of predicting the viscous flow features within turbomachinery blade wakes. Until efficient 3D viscous flow analysis codes become a reality there is therefore a need for models which can describe the generation and transport of blade wakes and the mixing process within the wake. To address the need for experimental data to support the development of such models, high response pressure measurements and laser anemometer velocity measurements have been obtained in the wake of a transonic axial flow fan rotor.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 85-1133
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  • 7
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    Effects of water immersion to the neck on pulmonary circulation and tissue volume in man (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A rapid noninvasive breathing method is used to obtain serial measurements of the pulmonary capillary blood flow, diffusing capacity per unit of alveolar volume, combined pulmonary tissue plus capillary volume, functional residual capacity, and oxygen consumption in five normal subjects undergoing 6 h of sitting, 4 h of sitting while immersed to the neck in thermoneutral water, and 4 h of lying in thermoneutral water to the neck. The rebreathing method employed a test gas mixture containing 0.5% C2H2, 0.3% C(18)O, 10% He, 21% O2, and balance N2. It is shown that immersion to the neck in the seated posture results in significant increases in sodium excretion cardiac output, and diffusing capacity per unit of alveolar volume. The pulmonary tissue plus capillary volume did not change, demonstrating that the central vascular engorgement induced by water immersion is not accompanied by significant extravasation of fluid into the pulmonary interstitial space.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Applied Physiology; 40; Mar. 197
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  • 8
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    Comparison of water immersion and saline infusion as a means of inducing volume expansion in man (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The study compares the natriuresis induced by head-out water immersion to that of a standard saline infusion and assesses the relative effectiveness of these two techniques as volume determinants of renal sodium and water handling in humans in a seated posture. The data obtained show that the volume stimulus of immersion is identical to that of standard saline-induced extracellular fluid volume expansion (ECVE) in normal seated subjects. The ability of head-out water immersion to induce a natriuresis without a concomitant increase in total blood volume and with a decrease in body weight suggests that water immersion may be preferred as an investigative tool for assessing the effects of ECVE in man.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Applied Physiology; 39; July 197
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  • 9
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    Suppression of ADH during water immersion in normal man (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A study was undertaken to ascertain whether diuresis induced by immersion is medicated by an inhibition of ADH. Immersion resulted in a progressive decrease in ADH excretion from 80.1 + or - 7 (SEM) to 37.3 + or - 6.3 microU/min (P less than 0.025). Cessation of immersion was associated with a marked increase in ADH from 37.3 + or - 6.3 microU/min to 176.6 + or - 72.6 microU/min during the recovery hour (P less than 0.05). Concomitant with these changes, urine osmolality decreased significantly beginning as early as the initial hour of immersion from 1044 + or - 36 to 542 + or - 66 mosmol/kg H2O during the final hour of immersion (P less than 0.001). These findings are consistent with the earlier suggestion that suppression of ADH release contributes to enhanced free water clearance in hydrated subjects undergoing immersion.
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Applied Physiology; 38; June 197
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  • 10
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    Suppression of plasma renin and plasma aldosterone during water immersion in normal man (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: AEROSPACE MEDICINE
    Type: Journal of Clinical Endocrinology and Metabolism; 41; Sept
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