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  • 1985-1989  (3)
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  • 1985-1989  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Displacement effect of square-ended pitot tubes in shear flows (1989)
    Springer
    Experiments in fluids 7 (1989), S. 33-37 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Measurements in uniformly sheared flows indicate that the displacement of total-pressure tube readings due to shear is roughly constant, even for values of the shear parameter smaller than previously believed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226594
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Amplification of stellar background by circumstellar masers (1988)
    Springer
    Astrophysics and space science 141 (1988), S. 353-359 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The calculations with the use of simple maser model show that the stellar background contributes negligibly to the mean peak intensities at 1612 MHz. Under some conditions, however, the contribution from the central star may constitute a few percent of the mean peak intensity. Such possibility may occur when the thick and large OH envelope is illuminated by very luminous and extended central star. To compare the theoretical results with observations a sample of 55 OH/IR stars with best known parameters is analyzed. The ratio of the blue-shifted to the red-shifted 1612 MHz peak slightly increases in objects with the largest OH radii. This relation is interpreted in terms of amplification of the stellar photons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00639501
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Evidence for the effect of the interstellar far UV-radiation on circumstellar shells (1987)
    Springer
    Astrophysics and space science 139 (1987), S. 63-73 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interstellar UV field at 1565 Å is calculated around nearby OH/IR sources. The front-back asymmetry observed in the 1612 MHz maser line profile is well correlated with anisotropy of the interstellar UV flux. For some sources the spatial positions of the 1612 MHz masers are confined to the position angles for which stronger UV radiation occurs. These facts strongly support the theory of the photoproduction of OH from H2O induced by ambient interstellar UV photons penetrating the circumstellar shell. A simple model of the 1612 MHz maser with OH photoproduction suggests that the influence of the UV field on the observed maser profiles is governed by the mass loss rate and the relative abundances of OH and H2O molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643812
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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