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  • AEROSPACE MEDICINE  (8)
  • Chemistry  (5)
  • AERODYNAMICS  (4)
  • ATOMIC AND MOLECULAR PHYSICS  (4)
  • 1975-1979  (21)
  • 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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    Resonance lines of Cs II, Ba III, and La IV (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The resonance line spectra of ions in the Xe I isoelectronic sequence, consisting of the five transitions to the 5p6 150 ground state from levels with J = 1 in the 5p5 5d and 6s configurations, have been observed for Cs II, Ba III, and La IV. The observations were made with a sliding spark on the 10.7-m normal-incidence vacuum spectrograph at NBS. The resonance transitions from the 5p5 6d and 7s configurations were also observed for these ions, except for that from 5p5 6d 3P1 of Ba III. Several resonance transitions from higher nd and ns levels were also observed. Estimated values for the J = 1 levels of the 5p5 7s configuration of Ce V were obtained by extrapolation. The derived ionization energies in eV are Cs II 23.17(4), Ba III 35.79(6), La IV 45.95(6), Ce V 65.55(25).
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optical Society of America; vol. 65
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  • 3
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    Spectrum of doubly ionized yttrium /Y III/ (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optical Society of America; vol. 65
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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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    Resonance lines and energy levels of Cs III, Ba IV, and La V (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Spectra of Cs III, Ba IV, and La V were photographed in a low-voltage sliding spark on a 10.7 m normal-incidence vacuum spectrograph. These ions are isoelectronic with neutral iodine and display a halogen-like energy level structure. Detailed isoelectronic comparisons, level transition diagrams, and tabular data on the transitions of the ions and percentage compositions of Cs III configurations are presented.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optical Society of America; vol. 66
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  • 6
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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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  • 7
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    Comparison of water immersion and saline infusion as a means of inducing volume expansion in man (1975)
    In:  Other Sources
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    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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  • 8
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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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  • 9
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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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  • 10
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    Quantitative density visualization in a transonic compressor rotor (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The flow in a 59-cm-diameter high-work transonic compressor rotor has been visualized using a fluorescent gas, 2,3, butanedione, as a tracer. The technique allows the three-dimensional flow to be imaged as a set of distinct planes. Quantitative static density maps were obtained by correcting the images for distortion and nonlinearities introduced by the illumination and imaging systems. These images and maps were used to analyze the three-dimensional nature of the blade's boundary layer and shock system.
    Keywords: AERODYNAMICS
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