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    Excitation spectra and hard-core thermodynamics of bosonic atoms in optical superlattices (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-01-21
    Description: Author(s): Bao Xu, Hong-Ye Wu, Yi-Cai Zhang, Han-Ting Wang, and Wu-Ming Liu A generalized double-well-basis coupled representation is proposed to investigate excitation spectra and thermodynamics of bosonic atoms in double-well optical superlattices. In the hard-core limit and with a filling factor of one, excitations describing the creation of pairs of a doubly occupied st... [Phys. Rev. A 91, 013617] Published Tue Jan 20, 2015
    Keywords: Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Bioimpedance Measurement of Segmental Fluid Volumes and Hemodynamics (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Bioimpedance has become a useful tool to measure changes in body fluid compartment volumes. An Electrical Impedance Spectroscopic (EIS) system is described that extends the capabilities of conventional fixed frequency impedance plethysmographic (IPG) methods to allow examination of the redistribution of fluids between the intracellular and extracellular compartments of body segments. The combination of EIS and IPG techniques was evaluated in the human calf, thigh, and torso segments of eight healthy men during 90 minutes of six degree head-down tilt (HDT). After 90 minutes HDT the calf and thigh segments significantly (P 〈 0.05) lost conductive volume (eight and four percent, respectively) while the torso significantly (P 〈 0.05) gained volume (approximately three percent). Hemodynamic responses calculated from pulsatile IPG data also showed a segmental pattern consistent with vascular fluid loss from the lower extremities and vascular engorgement in the torso. Lumped-parameter equivalent circuit analyses of EIS data for the calf and thigh indicated that the overall volume decreases in these segments arose from reduced extracellular volume that was not completely balanced by increased intracellular volume. The combined use of IPG and EIS techniques enables noninvasive tracking of multi-segment volumetric and hemodynamic responses to environmental and physiological stresses.
    Keywords: Aerospace Medicine
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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