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  • SPACECRAFT INSTRUMENTATION  (2)
  • singular perturbations  (2)
  • 2020-2021
  • 1980-1984  (4)
  • 1950-1954
  • 1
    Electronic Resource
    Electronic Resource
    Coevolution: Mathematical analysis of host-parasite interactions (1984)
    Springer
    Journal of mathematical biology 19 (1984), S. 63-77 
    Details
    ISSN: 1432-1416
    Keywords: Slow coevolution ; singular perturbations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract An S→I→S epidemic transmitted by two similar strains of parasite acting on a host population of three genotypes which differ in their reaction to the disease is modelled and analyzed. Singular perturbation techniques are used to reduce the original system of nine differential equations to a coupled system of two equations describing the slowtime coevolution of gene frequency and parasite strain frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275931
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The effect of epidemics on genetic evolution (1984)
    Springer
    Journal of mathematical biology 19 (1984), S. 79-94 
    Details
    ISSN: 1432-1416
    Keywords: Epidemics ; slow-genetic evolution ; singular perturbations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Mathematical models of a vector-borne infectious disease acting on a host population consisting of three genotypes which differ in susceptibility to, recovery from, and death due to the disease are presented and analyzed. Singular perturbation techniques are used to obtain a single differential equation describing the slow time evolution of gene frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275932
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    Paper (German National Licenses)
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  • 3
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    Seasat-A satellite scatterometer instrument evaluation (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The Seasat-A satellite scatterometer (SASS) was designed to measure ocean surface wind speed and direction in twenty-four independent cells over a 1000-km swath. It operated in the interrupted CW mode at a frequency of 14.6 GHz with four fan beam antennas and used Doppler filtering in the receiver for resolving the cells on the surface. The instrument began operating in space on July 6, 1978, and gathered normalized radar cross section data for approximately 2290 h. The purpose of this paper is to describe the in-orbit evaluation of the SASS hardware and its compatibility with the spacecraft. It has been determined that the scatterometer operated flawlessly throughout the mission, met all design requirements, and established a good data base for geophysical processing.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Journal of Oceanic Engineering; OE-5; Apr. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Validation of temperature retrievals obtained by the Limb Infrared Monitor of the Stratosphere (LIMS) experiment on Nimbus 7 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An outline is given of LIMS temperature determinations (as a function of pressure) from measurements in two channels covering portions of the 15-micrometer band of carbon dioxide. The known sources of error from the radiometer and data reduction are used to estimate the systematic and random errors expected of the results. Observational determinations of the complete end-to-end precision are obtained by computing the standard deviation of six sequential temperature retrievals in regions where the atmosphere is horizontally uniform. This yields values of 0.2 to 0.6 K, in reasonable agreement with the estimates. A correction for horizontal gradients in the atmosphere leads to a large reduction in the differences between the stratospheric temperatures determined on the ascending and descending portions of the orbit. The temperatures agree in the mean with radiosondes and rocketsondes to within 1-2 K in most regions below 1 mbar. Several interesting, previously unseen features included cold regions in the mid-latitude mesosphere and wavelike vertical variations in the tropics.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 5147-516
    Format: text
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    NASA TECHNICAL REPORTS
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