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  • 1
    Electronic Resource
    Electronic Resource
    Effects of dislocations on threshold voltage of GaAs field-effect transistors (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1097-1101 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of threshold voltage of GaAs FET's (field-effect transistors) show a larger heterogeneity when dislocated rather than free dislocated substrates are used. Therefore, the aim of this study is to find an accurate model for the influence of dislocations on such devices. The model proposed takes into account a cumulative effect of each dislocation located on or around the FET on the value of VT. This effect is merely a function of the distance between the dislocation and the FET. With the use of a computer, the best influence curve has been determined for one wafer. Nevertheless, due to differences in thermal histories, this curve can vary from wafer to wafer. Therefore, it is suggested that, in addition to the average standard deviation of the threshold voltage, it could be accurate to give the influence curve to characterize the substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339715
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence of the origin of infrared scattering in GaAs with high-resolution infrared tomography (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3700-3703 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transmission electron microscopy and A-B etching are the usual methods to observe microprecipitates in GaAs substrates. More recently, tomography has been used to characterize GaAs wafers and infrared light scattering was assumed to be caused by microprecipitates. Work on high-resolution tomography which confirms this assumption is presented in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339251
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  • 3
    Electronic Resource
    Electronic Resource
    Vanadium Catalysis of the Oxidation of Catechol Amines, Dihydroxyphenylalanine and 5-Hydroxyindoles (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 884-885 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Glassware which had been washed in sulphuric acid - dichromate solution was treated with warm nitric acid, 0-01M versene and 12-15 rinses of de-ionized water having a specific resistance 〉 106 ohms at 25 C. All reagents were made up with de-ionized water. To 0-01 M concentrations of substrates ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186884a0
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  • 4
    Electronic Resource
    Electronic Resource
    Mitotic Nondisjunction in Cultivated Human Cells (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 612-613 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The propositus was an infant in whom mongolism was diagnosed at birth. At 3 days of age, foreskin explants were cultured and maintained in Waymouth?s medium with 10 per cent newborn calf serum, as previously described4. The established fibroblast cultures (Strain A) were stored at ? 75 C in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214612a0
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  • 5
    Electronic Resource
    Electronic Resource
    Thermally stimulated current measurements on vapour-grown HgI2 (1976)
    Springer
    Applied physics 10 (1976), S. 93-95 
    Details
    ISSN: 1432-0630
    Keywords: 29
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Two ways of performing the Thermally Stimulated Current (TSC) experiment have been used to investigate vapour grown HgI2:i) under light excitation, four peaks are observed at 104, 158, 210, 240 K; ii) under bias excitation, two types of spectra have been obtained with peaks around 160, 240K (type I) and 182, 280 K (type II), respectively. The activation energies have been estimated to be 0.38 eV for the peak showing up at 182 K, and 1.05 eV for the one at 280 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00929534
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution and heat-treatment migration studies of Cr implanted GaAs by SIMS (1980)
    Springer
    Applied physics 23 (1980), S. 21-24 
    Details
    ISSN: 1432-0630
    Keywords: 65 ; 68 ; 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 Depth profiles of 190 keV Cr implanted-GaAs have been measured by SIMS analysis. The as-implanted Cr profiles are approximately Gaussian with good agreement between theory and experiment on the projected range. A fast migration of Cr is observed after heat treatment under encapsulation, and even as soon as the silicon nitride film is deposited. There is no evidence for Cr precipitation, even in the case of the largest implanted dose (1015 cm−2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899565
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  • 7
    Electronic Resource
    Electronic Resource
    Dominant susceptibility genes (1990)
    [s.l.] : Nature Publishing Group
    Nature 347 (1990), S. 124-124 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALZHEIMER'S disease is widely recognized as the most common form of dementia in older people, at least in most Western societies. Its prevalence (as determined by a set of clinical diagnostic guidelines, including important exclusionary criteria) increases exponentially as a function of age: a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/347124a0
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence for Multiple Cæruloplasmin Components in Human Serum (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 927-929 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sera were obtained from 43 pregnant women (in the third trimester of pregnancy or within a few days post partum), 17 patients with various diseases (Table 1) and 5 normal individuals. A voltage gradient of 5 V./cm. was maintained for periods of 16-20 hr. at room temperature. Half of each starch-gel ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190927b0
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  • 9
    Electronic Resource
    Electronic Resource
    Introduction: genetic determinants of mid- and late-life dementias (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 895-896 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Dementia; Alzheimer's disease; presenilins; β-amyloid; frontotemporal dementia; apolipoprotein E.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. We introduce a series of papers dealing with genetic aspects of a subset of dementias of mid-life and late-life in order to illustrate four principles. First, there appear to be many genetic loci with the potential to modulate susceptibility to such dementias. Second, most of those so far discovered are autosomal dominants and none are autosomal recessives. Third, the autosomal dominant mutations are individually rare. Their frequencies in a given population are likely to be functions of genetic drift. Fourth, despite their rarity, they may inform us about the pathogenesis of more common late-life dementias, notably dementias of the Alzheimer type, which have polygenic determinants. The most important such modulation so far discovered involves polymorphic forms of the APOE locus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050217
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  • 10
    Electronic Resource
    Electronic Resource
    The impact of vertical resolution upon GCM simulations of marine stratocumulus (1999)
    Springer
    Climate dynamics 15 (1999), S. 293-318 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract  The impact of increased vertical resolution in the Hadley Centre Climate Model upon the simulation of stratocumulus is investigated in experiments using single column (SCM) and general circulation (GCM) model configurations. A threefold enhancement of vertical resolution in the boundary layer leads to improvements in the vertical structure of the cloud-topped boundary layer produced by the SCM and GCM in both well-mixed and decoupled situations. However, single and decoupled mixed layers in the marine stratocumulus subsidence regions are still too shallow and, despite increasing, layer cloud amounts remain generally too low. Moreover, closer examination of GCM data and SCM timeseries reveals an underlying sensitivity to vertical resolution in model interactions between boundary layer and convection processes which appears unrealistic. Stratocumulus simulation is thus unlikely to improve significantly as a result of enhanced resolution alone and further work is being undertaken to improve the Hadley Centre model’s boundary layer scheme and, in particular, its interaction with the convection scheme. Nevertheless, this study shows that the full benefit of an improved boundary layer scheme will not be realized if the boundary layer structure is constrained by the rather poor lower troposphere resolution of the standard 19-level climate model. Future Hadley Centre model versions will seek to combine the added flexibility of a better resolved structure with improvements to the subgrid boundary layer parametrizations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003820050283
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