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  • 1990-1994  (4)
  • 1985-1989  (2)
  • 1990  (4)
  • 1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Low field mobility and thermopower in one-dimensional electron gas (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1070-1074 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A scattering theory of one-dimensional electron gas formed in a narrow channel GaAs-AlGaAs high electron mobility transistor has been developed. The mobility values for the different scattering mechanisms have been computed and their variation with temperature has been presented. The various scattering processes include acoustic phonon scattering for both deformation potential and piezoelectric scattering mechanisms, impurity scattering, and surface roughness scattering at lower temperatures and polar optic phonon scattering at higher temperatures. The effect of dynamic screening has also been included. Finally, the temperature variation of thermopower for different 1D electron concentrations has been shown and attempts have been made to interpret the results obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346746
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Deadlock free buffer allocation in closed queueing networks (1989)
    Springer
    Queueing systems 4 (1989), S. 47-56 
    Details
    ISSN: 1572-9443
    Keywords: Performance evaluation ; queueing networks ; finite buffers ; blocking ; deadlock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Blocking queueing networks are of much interest in performance analysis due to their realistic modeling capability. One important feature of such networks is that they may have deadlocks which can occur if the node capacities are not sufficiently large. A necessary and sufficient condition for the node capacities is presented such that the network is deadlock free. An algorithm is given for buffer allocation in blocking queueing networks such that no deadlocks will occur assuming that the network has the special structure called cacti-graph. Additional algorithm which takes linear time in the number of nodes, is presented to find cycles in cacti networks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01150855
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Intellectual outcome, speech and school performance in high risk preterm children with birth weight appropriate for gestational age (1990)
    Springer
    European journal of pediatrics 149 (1990), S. 845-850 
    Details
    ISSN: 1432-1076
    Keywords: Preterm children ; Intellectual development ; Speech ; School performance ; 5–9 years of age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Intellectual development, speech and school performance of preterm infants with birth weight appropriate for gestational age are reported in two separate investigations: a longitudinal study of 97 preterm children and 93 term children as a control group, and a cross-sectional study of 249 preterm children. Both preterm groups were regarded as high risk groups with respect to number of outborns, distribution of gestational age and perinatal risk factors. Intellectual outcome at 5 and 7 years of age in the majority of the preterm children was comparable to that of the term children. However, 8% of the preterm boys and 2% of the preterm girls achieved lower IQ scores than any of the term children. Between 15% and 17% of the preterm boys and 9%–12% of the preterm girls did not attend school at grade level, compared to 4% and 2% in the term group, respectively. Intellectual and neurological development and school performance were higher interrelated in the preterm than in the term children. Articulation defects, stuttering and dysgrammatism occurred more frequently in the preterm than in the term children and in boys more so than in girls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072071
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Neurological outcome in high risk weight appropriate for gestational age preterm children at early school age (1990)
    Springer
    European journal of pediatrics 149 (1990), S. 835-844 
    Details
    ISSN: 1432-1076
    Keywords: Preterm children ; Neurological development ; Cerebral palsy ; 5–6 Years of age
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Neurological development in preterm children with birth weight appropriate for gestational age is reported in two separate groups: a longitudinal study of 97 preterm children and 93 term children as a control group and a cross-sectional study of 249 preterm children. Both preterm groups were regarded as high risk with respect to number of outborns, distribution of gestational age and perinatal risk factors. Neurological outcome at 5–6 years of age in the majority of the preterm children was comparable to that of the term children. However, 15% of boys and 9% of girls in the preterm group were diagnosed as having cerebral palsy. Mild diplegia was most frequently observed; 4% of the children were severely impaired. Fourteen percent of the preterm vs 2% of the term boys and 6–9% of the preterm vs none of the term girls received motor therapy during early school age. There was a small but consistent sex difference in neurological outcome in favour of the term and preterm girls. Effects of drop out rate and of incompleteness of ascertainment are reported in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072070
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Longitudinal age changes in a fishermen population of West Bengal (1990)
    Springer
    International journal of anthropology 5 (1990), S. 1-10 
    Details
    ISSN: 1824-3096
    Keywords: ageing ; longitudinal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The longitudinal anthropological age changes in a sample of coastal fishermen in West Bengal are discussed. The results show that some traits follow the trends observed in ageing of Western populations, for instance nasal length and breadth continue to increase throughout life in both sexes. Stature follows also the trend generally observed: a decrease occurs indeed from 35 years of age in both sexes, the decline is becoming higher with increasing age. The typical ecological conditions of our population influence the rate of change in other traits, such as weight and biacromial diameter. Weight is known to be influenced by the nutritional status and the way of life. It explains that in our study of males an early increase of weight and biacromial diameter is observed first and a decrease afterwards. In females, however, a decrease is observed already from 35 years of age. This kind of analysis was only possible with the help of longitudinal data and in a well defined population: only longitudinal data is free from the effect of secular changes and of selective death.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442366
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared spectra of acrylonitrile grafted jute fibers (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1951-1955 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070381016
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    Paper (German National Licenses)
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