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  • 1
    Electronic Resource
    Electronic Resource
    Linear analysis of a finite length plasma-filled backward wave oscillator (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1023-1032 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Absolute instability in a plasma-filled backward wave oscillator with sinusoidally corrugated slow wave structure driven by an intense relativistic electron beam has been analyzed numerically. The maximum spatial growth rate of the plasma-filled waveguide is found to be larger than that of an optimally designed vacuum structure. The excitation of a finite length structure is investigated. Although the spatial growth rates obtained in the linear theory increase with plasma density in the finite length plasma-filled structure for the fundamental TM01 mode of oscillation, negative global spatial growth rates prevent the coherent oscillation for intermediate ranges of plasma density, beam current, and even for structure length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860225
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Lactate dehydrogenase and glutamate dehydrogenase activities in the circumventricular organs of rat brain following neonatal monosodium glutamate (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 1092-1094 
    Details
    ISSN: 1420-9071
    Keywords: Monosodium glutamate ; LDH ; GDH ; excitotoxin ; blood-brain barrier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Glutamate (glu) an excitatory neurotransmitter amino acid, is present in high concentrations in the mammalian central nervous system and is the most abundant amino acid in our daily diet. In the present study the activities of lactate dehydrogenase (LDH) and glutamate dehydrogenase (GDH) were evaluated in the circumventricular organs (CVO) of the brain in 25-day-old rats following MSG administration at a dose of 4 mg/g b.wt during the first ten days of life. The results show the LDH activity increased to 265% of that in the control (p〈0.001), whereas GDH activity was significantly decreased (p〈0.05), The great elevation in LDH, a cytoplasmic marker enzyme, is apparently due to cytoskeletal changes brought about as a consequence of glu toxicity, whereas lowered GDH activity indicates altered glu homostasis in the blood-brain-barrier deficient areas following neonatal exposure to glu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01929919
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Topographical Multilevel Single Linkage (1994)
    Springer
    Journal of global optimization 5 (1994), S. 349-358 
    Details
    ISSN: 1573-2916
    Keywords: Global optimization ; multilevel single linkage ; topographs ; graph minima
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An iterative topographical Multilevel Single Linkage (TMSL) method has been introduced. The approach uses topographical information on the objective function, in particular theg-nearest-neighbour graph. The algorithm uses evenly distributed points from a Halten sequence of uniform limiting density. We discuss the implementation of the algorithm and compare its performance with other well-known algorithms. The new algorithm performs much better (in some cases several times) than the Multilevel Single Linkage method in terms of number of function evaluations but is not quite so competitive with respect to CPU time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01096684
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Vegetation gradient on the shores of Lake Nasser in Egypt (1991)
    Springer
    Plant ecology 94 (1991), S. 15-23 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A fragile plant cover has developed during the last two decades along the shores of Lake Nasser, the largest impoundment of the River Nile. Development of this vegetation has been influenced by the prevailing environmental factors. The statistical methods (ordination and classification techniques) emphasise the groups of species and elucidate their distribution within the environmental gradients. The applied methods indicate that the distribution of the species is strongly related to the moisture gradient. Some of the soil parameters also contribute to the gradient. The geographical gradient in the distribution of the species is less pronounced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044912
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Microangioarchitecture of the islets of Langerhans in the snakes,Naja naja, Vipera russelli, andEchis carinatus (1991)
    Springer
    Cell & tissue research 266 (1991), S. 83-88 
    Details
    ISSN: 1432-0878
    Keywords: Islets of Langerhans ; Microangioarchitecture ; Corrosion casts ; Scanning electron microscopy ; Naja naja, Vipera russelli, Echis carinatus (Serpentes)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Due to a decided lack in the literature of reports on the microangioarchitecture of the pancreas of snakes, an analysis was performed in three different species of two different ophidian families with the use of cast preparations and complementary scanning electron microscopy. The vascular architecture reflects the lobular substructure of the pancreas; the organ is supplied by branches of the superior mesentric artery. Coiled lobular arteries and arterioles continue into a meshwork of capillaries. Dilated capillaries of the endocrine portion of the pancreas are an integral component of this fine capillary network. A few very small capillaries establish a connection between the endocrine and the exocrine pancreas. The other capillaries drain into venules, which ultimately join their respective veins. No interspecific differences were noted in the vascularization of the pancreas of the three ophidian species examined. The present results suggest the existence of arterio-venous anastomoses and speak against the presence of a portal system, but establish a feed-forward capillary connection from the endocrine to the exocrine component of the ophidian pancreas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00678714
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    Paper (German National Licenses)
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