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  • 1
    Electronic Resource
    Electronic Resource
    Hot-electron drift velocity in III–V semiconductors under the condition of impact ionization (1987)
    Springer
    Applied physics 43 (1987), S. 53-60 
    Details
    ISSN: 1432-0630
    Keywords: 72.15 ; 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A calculation has been carried out for the drift velocity of electrons in the highfield region under the condition of impact ionization in III–V semiconductor compounds. The energy-balance equation of the one-electron model has been solved considering alloy scattering and carrier-carrier interaction, in addition to optical phonon and ionization scattering. Fairly good agreement is obtained for GaAs with the available experimental and Monte-Carlo results. Graphs for the high-field drift velocity has also been plotted for Ga1−x InxAs (x = 0.53) at different ratios of ionization mean-free path and optical phonon mean-free path. The plot of high-field drift velocity versus ionization rate reveals that the high-field drift velocity strongly depends on the ionization rate of carriers, and vice versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615206
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  • 2
    Electronic Resource
    Electronic Resource
    Electron ionization rate in III–V ternary semiconductors (1987)
    Springer
    Applied physics 43 (1987), S. 105-109 
    Details
    ISSN: 1432-0630
    Keywords: 72.15 ; 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Theoretical calculations are presented for the ionization rate of electrons in III–V ternary semiconductor compounds considering alloy scattering and carrier-carrier interaction, in addition to optical phonon scattering and ionization scattering. However, alloy scattering is found to be a weak interaction. Fairly good agreement is obtained for Ga1−x In x As withx=0.14 and 0.53 with the experimental results and for Ga0.5 Al0.5 As with the existing theoretical result which used an indirect method. The alloy scattering potential has been taken in the form of energy band-gap difference. The calculations can be used for any ternary semi-conductor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617961
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phenological characteristics of the tree layer of Kumaun Himalayan forests (1985)
    Springer
    Plant ecology 60 (1985), S. 91-101 
    Details
    ISSN: 1573-5052
    Keywords: Flowering ; Forest ; Fruiting ; Kumaun Himalaya ; Leafdrop ; Leaf flushing ; Phenology ; Phenological activity level ; Treelayer phenology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phenology of tree components of natural forests occurring between 350 and 2150 m in Kumaun Himalaya is descibed. All forests had more evergreen than deciduous taxa. The degree of evergreenness increased with increasing elevation and decreasing summer dryness. For most species (including all dominants) concentrated leafdrop and simultaneous leafing occurred during the warm-dry period of the year. About half of the species showed multiple leafing. All species had a sharp flowering peak in April. Wet-season flowering was rare. Most of the species flowered synchronously. In the sal- (Shorea robusta) and pine (Pinus roxburghii) forests a single peak of fruit maturation occurred in summer, while in other forests there also was a secondary peak in autumn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040351
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Compositional and structural features of certain tree stands along an elevational gradient in Central Himalaya (1989)
    Springer
    Plant ecology 85 (1989), S. 117-120 
    Details
    ISSN: 1573-5052
    Keywords: Himalayan forest ; Kumaun Himalaya ; Ordination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Forests of an elevational transect in the central Himalayan region were studied regarding their tree species composition and structural features. In spite of many differences in compositional and structural features in different forest stands, the arrangement of stands in the ordinations based separately on species composition and structural features exhibit many similarities. Disturbances such as landslides and forest fires play the most important role in the distributor of particular species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042261
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Epiphytic succession on tree trunks in a mixed oak-cedar forest, Kumaun Himalaya (1985)
    Springer
    Plant ecology 63 (1985), S. 105-112 
    Details
    ISSN: 1573-5052
    Keywords: Bryophyte ; Diversity ; Epiphytic succession ; Evolutionary strategy ; Kumaun Himalaya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The epiphytes present at about breast height on trunks of different size were studied for three major tree species in a seasonally wet forest at 2050 m altitude in the Kumaun Himalaya: Cedrus deodora, Quercus floribunda and Q. leucotrichophora. The total biomass and species number per unit trunk area, were found to increase with trunk size. It was supposed that the results indicated a succession in the type of epiphytic cover from young trunks to older trunks. The amount of loose material (plant remains and ‘soil’) per unit area of trunk increased with increasing girth. The C:N ratio in this material was initially very high on the oaks (129–197) and declined with increasing trunk size (to 73–78); the ratio was constant across girth classes in the cedar (86–87). Bryophytes produced most biomass on most trunks; next to them were lichens on the smallest trunks, and flowering plants on the largest. The number of species of epiphytes was similar on all three host species. The results are discussed in relation to contemporary ideas on diversity and ‘strategies’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044060
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    Paper (German National Licenses)
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