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  • 1
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    Correlating the interface structure to spin injection in abrupt Fe/GaAs(001) films (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-01-03
    Description: Author(s): L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Kaneko, S. Matsuzaka, Y. Ohno, H. Ohno, S. Honda, J. Inoue, and A. Hirohata Understanding the effect of the interface on electrical spin injection is of great importance for the development of semiconductor spintronics. Fe/GaAs(001) is one of the leading systems for exploring these effects due to the small lattice mismatch. We report on the correlation between the experimen... [Phys. Rev. B 87, 024401] Published Wed Jan 02, 2013
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Orbital- and spin-driven lattice instabilities in quasi-one-dimensional ${\mathrm{CaV}}_{2}{\mathrm{O}}_{4}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-09-27
    Description: Author(s): T. Watanabe, S. Kobayashi, Y. Hara, J. Xu, B. Lake, J.-Q. Yan, A. Niazi, and D. C. Johnston Calcium vanadate CaV 2 O 4 has a crystal structure of quasi-one-dimensional zigzag chains composed of orbital-active V 3 + ions and undergoes successive structural and antiferromagnetic phase transitions at T s ∼ 140 K and T N ∼ 70 K, respectively. We perform ultrasound velocity measurements on a single crysta... [Phys. Rev. B 98, 094427] Published Wed Sep 26, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Effects of regional hemoconcentration during LBNP on plasma volume determinations (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Blood samples were obtained from forearm vein or artery with indwelling cannula (1) before, (2) during the last min, and (3) about 2 min after lower body negative pressure (LBNP) in 16 experiments to determine whether plasma volume (PV) estimates were affected by regional hemoconcentration in the lower body. Total hemoglobin (THb) was estimated with the CO method prior to LBNP. Hemoglobin (Hb) and hematocrit (Hct) values from (2) gave only a 3% (87 ml) loss in PV due to LBNP, assuming no change in THb. However, Hb and Hct values from (3) showed an 11% loss in PV (313 ml). This 72% underestimation of PV loss with (2) must have resulted from the sequestration of blood and subsequent hemoconcentration in the lower body during LBNP. The effects of LBNP on PV should be estimated 1-3 min after exposure, after mixing but before extravascular fluid returns to the circulation.
    Keywords: AEROSPACE MEDICINE
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Specialized physiological studies in support of manned space flight (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of a diuretic (Lasix) induced dehydration on the cardiovascular and hematological responses to lower body negative pressure (LBNP) were analyzed and compared to previous observations on dehydration following exercise in the heat. During LBNP runs the subjects were monitored for changes in blood volume, heart rate, blood pressure, and variations in the volume of the left calf. It was concluded that Lasix dehydration produced a depletion of the body electrolytes at the expense of both the plasma and extravascular compartments. Striking differences were found between those subjects who were physically active (Runners: R) and those who did not engage in any regular physical activity (Non-runners: NR). Tolerance to LBNP (Torr x min) was significantly lower in the R's than the NR's before and after dehydration, however the R's lost more of their tolerance after dehydration with Lasix than after exercise in the heat for about the same fluid loss. The opposite was true for the NR's. Two factors appear to be responsible for the lower LBNP tolerance in R's: parasympathetic inhibition of cardiac activity during LBNP and a greater propensity to pool blood in the lower extremities.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-151876
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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