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  • Springer  (4)
  • Oxford University Press  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Refractive indices of (AlAs)(GaAs) short-period superlattices (1991)
    Springer
    Optical and quantum electronics 23 (1991), S. S895 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The refractive indices of short-period binary (AlAs)m(GaAs)n superlattices, wherem = n, were investigated by measuring the beam divergences of optical waveguides using these superlattices as the core material. It is demonstrated that the refractive index depends on the period of the superlattice and not simply on the average composition. The refractive index is shown to depend in a systematic way on the direct bandgap of the superlattice, although the relationship may not be quite the same as that for a random alloy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624978
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  • 2
    Electronic Resource
    Electronic Resource
    Biology and temperature relationships of Chrysopa sp., Micromus tasmaniae and Nabis capsiformis (1979)
    Springer
    Entomologia experimentalis et applicata 25 (1979), S. 253-259 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'examen a porté sur l'influence de différentes températures constantes sur le développement et la biologie imaginale de trois espèces prédatrices (Chrysopa sp., peut-être C. signata, Micromus tasmaniae et Nabis capsiformis) récoltées dans des champs de coton du sud-est du Queensland en Australie. C. sp. et N. capsiformis ont besoin respectivement de 335° au dessus d'un seuil de 10.5° et de 325° au dessus d'un seuil de 11.3°, pour se développer de l'oeuf à l'adulte. Les larves de M. tasmaniae pouvant effectuer la totalité de leur dévelopment a 5°.-A 23° les longévités des femelles adultes et les taux de ponte de C. sp. et N. capsiformis sout en moyenne de 52 j. (maximum 83) et 30 j. (maximum 43) d'une part et 18.1 et 10.4 œufs par jour d'autre part. Le taux de ponte de M. tasmaniae est de 19,1 œufs par jour pendant 5 semaines à 23°. La longévité réduite et le taux de ponte accru aux températures supérieures sont interprétés en basant la biologie imaginale sur le temps physiologique au dessus des seuils de développement. Les taux d'accroissement intrinsèque (rm) sont plus élevés aux températures élevées, principalement à la suite du taux de développement accru. M. tasmaniae possède le rm le plus élevé à toutes les températures par suite d'un développement rapide et de seuils thermiques bas, d'une brève période précédant la ponte et d'une date de ponte maximum précoce. Le rm de C. sp. est plus élevé que celui de N. capsiformis à la suite de son taux de ponte plus élevé. Les valeurs de rm fixées à partir du temps physiologique sont respectivement: 9,820, 6.868 et 8,366 œufs femelles/103 d° au dessus des seuils de 10,5°, -2,9° et 11,3° pour C. sp., M. tasmaniae et N. capsiformis.
    Notes: Abstract Immature Chrysopa sp. and Nabis capsiformis required 335 and 325 d°, respectively, for development from egg to adult, while larvae of Micromus tasmaniae were able to complete development at 5°. Mean adult female longevity and oviposition rate at 23° were 52 d (max. 83 d) and 18.1 eggs/d, and 30 d (max. 43 d) and 10.4 eggs/d for C. sp. and N. capsiformis respectively, and oviposition rate of M. tasmaniae averaged 19.1 eggs/d during 5 weeks. Reduced longevity and increased oviposition rate at higher temperatures were accounted for by basing adult biology on physiological time above the immature developmental thresholds. Intrinsic rates of increase were thus calculated as 9.820, 6.868, and 8.366 ♀ eggs/103 d° above thresholds of 10.5°, -2.9°, and 11.3° for C. sp., M. tasmaniae, and N. capsiformis, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302786
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  • 3
    Electronic Resource
    Electronic Resource
    Anisotropic impurity scattering in palladium silver alloys (1969)
    Springer
    The European physical journal 9 (1969), S. 68-68 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements have been made of the Hall coefficientR of some alloys of silver in palladium over the temperature range 1°K to 120°K. The alloys contain between ∼1 and ∼10 at.-% silver. Values ofR were also obtained at room temperature and these were in good agreement with earlier published work. The values ofR are negative in all the alloys, and |R| increases both on reducing the temperature and increasing the silver concentration,c. Below ∼10°K, |R| becomes independent of temperature but shows a linear dependence onc, increasing by a factor of 2.5 over the concentration range measured. This increase is too great to be accounted for in terms of band structure changes alone, so we have examined the effects of anisotropic impurity scattering. To a first approximation it can be shown thatR is proportional to an anisotropy parameterA, defined asA=〈τ 2(k)〉/〈τ(k)〉2, whereτ(k) represents the relaxation time of an electron in a statek, and 〈〉 is an average over the Fermi surface. In palladium we assume that the majority of the current is carried by the s-electrons. In the presence of silver impurities these electrons can be scattered into s-states or d-states with relaxation times given byτ ss α1/c(1−c) andτ sd α1/c 2(1−c) respectively. FollowingPlate we have assumed thatτ ss is isotropic and thatτ sd is anisotropic, leading to an overall anisotropic relaxation time for impurity scattering. We then find the parameterA increases approximately linearly with silver content, in accordance with our experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422534
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  • 4
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    The non-human primate reference transcriptome resource (NHPRTR) for comparative functional genomics (2012)
    Oxford University Press
    Details
    Publication Date: 2012-12-20
    Description: RNA-based next-generation sequencing (RNA-Seq) provides a tremendous amount of new information regarding gene and transcript structure, expression and regulation. This is particularly true for non-coding RNAs where whole transcriptome analyses have revealed that the much of the genome is transcribed and that many non-coding transcripts have widespread functionality. However, uniform resources for raw, cleaned and processed RNA-Seq data are sparse for most organisms and this is especially true for non-human primates (NHPs). Here, we describe a large-scale RNA-Seq data and analysis infrastructure, the NHP reference transcriptome resource ( http://nhprtr.org ); it presently hosts data from12 species of primates, to be expanded to 15 species/subspecies spanning great apes, old world monkeys, new world monkeys and prosimians. Data are collected for each species using pools of RNA from comparable tissues. We provide data access in advance of its deposition at NCBI, as well as browsable tracks of alignments against the human genome using the UCSC genome browser. This resource will continue to host additional RNA-Seq data, alignments and assemblies as they are generated over the coming years and provide a key resource for the annotation of NHP genomes as well as informing primate studies on evolution, reproduction, infection, immunity and pharmacology.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
    Published by Oxford University Press
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  • 5
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    Anisotropic impurity scattering in palladium silver alloys (1969)
    Springer
    Details
    Publication Date: 1969-03-01
    Print ISSN: 0722-3277
    Electronic ISSN: 1431-584X
    Topics: Physics
    Published by Springer
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