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  • absorption coefficient  (2)
  • Aerospace Medicine  (1)
  • ceramics  (1)
  • intensity of radiation  (1)
  • 1
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    Temperature Regulation in Crewmembers After a 115-Day Space Flight (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Impaired thermoregulation, which has been observed during exercise following bed rest, may significantly impact crewmembers during space flight operations by decreasing exercise capacity and orthostatic tolerance. Impaired temperature regulation would cause higher levels of core temperature, due to an attenuated cutaneous vasodilatory reflex and sweating response, for a given oxygen consumption. Two mate crewmembers of the Mir 18 mission performed supine cycle exercise se (20 min @ 40% and 20 min @ 65% preflight VO2pk) 145 days preflight and 5 days postflight. Core temperature (Tcore) was measured by an ingestible telemetry pill, skin blood flow (SBF) by laser Doppler velocimetry, and sweat rate (SR) by dew point hygrometry. Tcore at the time of test termination was similar (37.8 C) for both subjects before and after flight despite a shorter test duration (40 vs 28-29 minutes) postflight. The slopes of the SBF/Tcore relationship (Subj 1: 396 vs 214; Subj 2: 704 vs 143 Perfusion Unit/degC) and SR/Tcore relationship (Subj 1: 4.5 vs 2.1; Subj 2: 11.0 vs 3.6mg/min/sq cm/degC) were reduced postflight. Tcore thresholds for both SR (Subj 1: 37.4 vs 37.6; Subj 2: 37.6 vs 37.6 C) and SBF (Subj 1: 37.3 vs 37.5; Subj 2: 37.6 vs 37.7 C) were similar pre- to postflight. For these 2 crewmembers, it appeared that thermoregulation during exercise was impaired as evidenced by compromised heat loss responses after long-duration space flight.
    Keywords: Aerospace Medicine
    Type: FASEB Journal; 10; A573
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Measurement of thermal radiation and optical properties of refractory oxides and their melts under CO"2 laser radiation heating
    Amsterdam : Elsevier
    Thermochimica Acta 218 (1993), S. 291-304 
    Details
    ISSN: 0040-6031
    Keywords: absorption coefficient ; emissivity ; infinite layer. ; intensity of radiation ; reflectivity ; scattering
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(93)80430-I
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Behavior of thermal radiation properties of oxide ceramics under subsecond laser heating (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 371-381 
    Details
    ISSN: 1572-9567
    Keywords: absorption coefficient ; ceramics ; emissivity ; laser heating ; reflectivity ; high temperatures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the data on spectral emissivity and reflectivity obtained in subsecond laser heating experiments differ from values which are obtained by the conventional methods. Owing to the semitransparency of oxides, these thermal radiation properties depend on the temperature distribution in near-surface layers and cannot be related to a definite temperature value. The condensation of the products of oxide evaporation at high temperatures, which takes place in air surrounding a sample, may affect the measurement of temperature, reflectivity, and emissivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566037
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    Paper (German National Licenses)
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