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  • 1980-1984  (6)
  • 1975-1979  (6)
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Material
Years
Year
  • 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
    Interferometric Study of Forced Convection Mass Transfer Boundary Layers in Laminar Channel Flow (1979)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 18 (1979), S. 97-108 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160070a002
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    Paper (German National Licenses)
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Characteristics of the displacement of the penumbral bright grains of sunspots (1976)
    Springer
    Solar physics 48 (1976), S. 101-102 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is confirmed that the penumbral bright grains are moving towards the sunspots umbra. At the umbra-penumbra boundary their horizontal velocity is about 0.5 km s−1 and their displacement is inclined downwards with an angle of 5° to 20°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153335
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Morphological properties and origin of the photospheric facular granules (1977)
    Springer
    Solar physics 52 (1977), S. 249-262 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From time series of high resolution photographs, morphological properties of the photospheric facular granules were derived. The facular granules are cells of the common granular pattern, brighter than the normal granules when seen between cos θ = 0.6 and the limb. Their apparent diameter, which decreases towards the limb, is smaller than that of the normal granules: 0″.65 and 1″.25 respectively at cos θ = 0.55; their lifetime is 25 min but their ‘bright stage’ lifetime is only 15 min; they are visible closer to the limb than the normal granules: 1″.2 compared to 2″–5″; the brightening of the facular granules occurs at a faster rate than their fading. From the great similitude of both morphological properties and temperature models of facular and normal granules, it appears possible that the photospheric facular granules are convective cells modified by the presence of a magnetic field of some hundreds Gauss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149643
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    Paper (German National Licenses)
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  • 7
    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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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    The fine structure of light-bridges in sunspots (1979)
    Springer
    Solar physics 61 (1979), S. 297-300 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High resolution photographs obtained at the Pic du Midi Observatory show that there are three types of sunspot light bridges according to their morphological structures: the photospheric ones, the penumbral ones and the umbral ones. Consequently there are no specific structures in light bridges; it results that they should not be due to specific physical properties. Properties of the fine structure of a penumbral light bridge are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00150414
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    A model of photospheric faculae deduced from white light high resolution pictures (1975)
    Springer
    Solar physics 45 (1975), S. 105-114 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High resolution pictures (about 0″.3) of photospheric faculae near the solar limb have been obtained with the Pic du Midi 50 cm refractor; their granular structure then clearly appears. The microphotometric study of these facular granules shows that the ratio of their intensity to the photospheric intensity, I f/I ph (cosθ) reaches a maximum near cosθ = 0.3 and then decreases towards the limb. The values of this ratio have been corrected with a most likely spread function. Then a temperature model of a facular granule is obtained: with respect to the neighbouring photosphere, this granule appears as a photospheric ‘hot cloud’ which does not extend high in the solar atmosphere (thickness 100 km above τ5000 = 1). The temperature excess is 750K at maximum. This hot region is located over a layer which is cooler than the normal photosphere at the same level. Another hot region might extend above the photospheric ‘hot cloud’, possibly up to the chromosphere. This photospheric facula model which is confined to the lower photosphere seems to indicate that this phenomenon is different from the photospheric network which is visible up to the lower chromosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152221
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    Paper (German National Licenses)
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