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  • FTIR  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • homing behavior  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Long-term memory in territorial grasshoppers (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 775-777 
    Details
    ISSN: 1420-9071
    Keywords: Grasshoppers ; herbivory ; homing behavior ; host plant chemistry ; landmark navigation ; Ligurotettix ; memory ; territoriality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Males ofLigurotettix spp. grasshoppers (Orthoptera, Acrididae, Gomphocerinae), territorial species that defend individual host plant shrubs, home to their territories by memorizing landmarks. Thus, the insects can navigate efficiently toward high quality shrubs which are chemically distinctive and recognizable via gustation, but indistinguishable from a distance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974587
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    An FTIR spectroscopic study of hydrogen-bonding competition in entrainer-cosolvent mixtures (1990)
    Springer
    International journal of thermophysics 11 (1990), S. 119-132 
    Details
    ISSN: 1572-9567
    Keywords: entrainer ; FTIR ; hydrogen bonding ; supercritical
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In chemical separation processes such as supercritical extraction the use of an entrainer cosolvent can dramatically improve selectivity and yield. Ideally, in an extraction process, an entrainer cosolvent should complex with only the desired solute, pulling it from the feed. But not all cosolvents are entrainers, and a cosolvent that is effective in one application may not be effective in others. Often, competing hydrogen bonding interactions limit the effectiveness of an entrainer cosolvent. In this paper FTIR spectroscopy is used to study hydrogen bonding competition in solute/solvent/entrainer cosolvent mixtures. The extent of hydrogen bonding is determined from analysis of hydrogen-bonded and non-hydrogen-bonded infrared absorption peaks. Since these peaks overlap, curvefitting and Fourier self-deconvolution techniques are used to resolve them. Concentrations of monomeric and hydrogen-bonded species are modeled using the associated perturbed anisotropic chain theory (APACT). Using APACT it is shown that the equilibrium constant, derived from activities, can be written as the product of a temperature-dependent term and the ratio of concentrations: K=(RT) vIIC i vi . This gives a statistical mechanical basis for the empirical observation that for hydrogen-bonding equilibria, the ratio of concentrations is approximately equal to the ratio of activities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503864
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    Paper (German National Licenses)
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  • 3
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    Thermal design of the Galileo spun and despun science (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The delay in the launching of the Galileo spacecraft, which was to be launched aboard the Space Shuttle Atlantis, caused by the Challenger accident resulted in a decrease in the Radioisotope Thermoelectric Generator (RTG) power. A change to the Inertial Upper Stage from the more powerful Centaur G-Prime resulted in a trajectory that requires gravity assists, once by Venus and twice by earth. The resulting peak solar intensity of this roundabout trajectory is more than twice the previous design value for the direct trajectory. The resulting changes in solar intensity range and the RTG power output were substantial and forced major thermal design changes. This paper discusses the thermal design and redesign of the Galileo Spun and Despun sciences. Data are presented on the allowable temperatures for the Spun and Despun sciences, the energy balance calculated for the Despun science, and the Despun science test results.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 89-1750
    Format: text
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    NASA TECHNICAL REPORTS
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