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  • 1980-1984  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Comparison of bottom trawl stock densities in the inner Kavirondo Gulf of Lake Victoria (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 19 (1981), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A comparison of mean bottom trawl stock densities (kg ha-1) from 19 UNDP 1969/70 tows, 69 EAFFRO 1975 tows and 167 fourth quarter FFRI 1977 tows in the inner Kavirondo Gulf of Lake Victoria showed the following changes from 1969/70 to 1977.〈list xml:id="l1" style="custom"〉1A reduction in mean stock densities for Bagrus docmac, Clarias mossambicus, Haplochromis spp., Protopterus aethiopicus, Schilbe mystus and Synodontis spp.2An increase in mean stock densities for Lates niloticus, Tilapia nilotica and T. variabilis.3No change in mean stock density for Labeo victorianus.4No T. esculenta or Mormyrus kannume collected in 1977.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1981.tb05843.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    pH-Induced motional and conformational changes of amino acids. A reexamination by deuterium longitudinal nuclear relaxation (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 4978-4980 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150665a037
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Exploitation of fish in the inner Kavirondo Gulf of Lake Victoria based on tag returns (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 20 (1982), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Total mortality and exploitation rates of Bagrus docmac, Tilapia nilotica and T. variabilis in the inner Kavirondo Gulf of Lake Victoria were estimated. Fishing mortality comprised the greatest portion of the total mortality. Catch per recruit for B. docmac and T. nilotica indicated the exploitation levels were almost three times those yielding maximal catches. There has been an apparent shift in gear from beach seines and hooks to mosquito nets and smaller mesh gill nets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1982.tb03976.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Variability of the quiet photospheric network (1984)
    Springer
    Solar physics 94 (1984), S. 33-47 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-resolution photographs of the photospheric network taken in the Caii K 3933 Å line and at λ4308 Å are analysed in order to study the variation, in latitude and over the sunspot cycle, of its density (the density is defined as the number of network elements - also called facular points - per surface unity). It appears that the density of the photospheric network is not distributed uniformly at the surface of the Sun: on September 1983, during the declining phase of the current activity cycle, it was weakened at both the low (equatorial) and high (polar) active latitudes, while it was tremendously enhanced toward the pole. The density at the equator is varying in antiphase to the sunspot number: it increases by a factor 3 or more from maximum to minimum of activity. As a quantum of magnetic flux is associated to each network element, density variations of the photospheric network express in fact variations of the quiet Sun magnetic flux. It thus results that the quiet Sun magnetic flux is not uniformly distributed in latitude and not constant over the solar cycle: it probably varies in antiphase to the flux in active regions. The variation over the solar cycle and the latitude distribution of photospheric network density are compared to those of X-ray bright points and ephemeral active regions: there are no clear correlations between these three kinds of magnetic features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154805
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The dynamical behavior of facular points in the quiet photosphere (1983)
    Springer
    Solar physics 85 (1983), S. 113-121 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A high resolution time series of pictures, obtained at Pic du Midi Observatory, is used to analyze the dynamical behavior of facular points in the quiet Sun. The following characteristics of the behavior are revealed: (a) relative to the supergranular pattern, facular points appear at the supergranular boundaries, rarely inside the cells; (b) relative to the pattern of the granulation, they appear in spaces at the junction of several granules, never inside a granule nor in a space between two granules only; (c) their mean lifetime is 18 min; (d) they remain in intergranular lanes during their whole life; (e) their observed size never significantly exceeds 0″. 5; (f) they have a strong tendency to appear very close to an already existing facular point; (g) about 15% of them seem to split in two facular points; (h) they disappear simply by fading away in an intergranular space; (i) they never merge with another facular point or with a granule. The formation of facular points in the quiet photosphere is very closely connected to both granular and supergranular patterns. Some possible consequences on the behavior of the associated magnetic flux tubes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148262
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    On the relation between chromospheric and photospheric fine structure in an active region (1984)
    Springer
    Solar physics 90 (1984), S. 303-314 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comparative study was done on the bright fine structure in the upper photosphere and in the lower chromosphere of an active region. The results are shown in the following: (a) The bright points in the Hα wing are cospatial to the facular points, which confirms the result of Wilson (1981). (b) Some points bright in the Hα wing are associated with the facular granules which have larger sizes than the facular points, (c) The brightness enhancement in the Ha wing is positively correlated to the enhancement in the blue continuum. However, the correlation is not so strong. (d) The moustache points are also cospatial to the facular features. (e) The geometrical shape of a moustache point is like a funnel and diverging upward in the upper photospheric and the lower chromospheric levels. Some discussions are given on the nature of the heating mechanism of the fine structure based upon these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173958
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    Paper (German National Licenses)
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