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  • 1990-1994  (5)
  • 1955-1959  (3)
  • 1915-1919
  • 1900-1904
  • 1991  (5)
  • 1959  (3)
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Material
Years
  • 1990-1994  (5)
  • 1955-1959  (3)
  • 1915-1919
  • 1900-1904
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The Synthesis of Some 7α- and 7β-Methyl Steroid Hormones1 (1959)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 81 (1959), S. 4069-4074 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01524a063
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    AlxGa1−xAs/GaAs photovoltaic cell with epitaxial isolation layer (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2514-2516 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Efficient integration of multijunction photovoltaic cells requires current matching or voltage matching. To match voltages it is necessary to achieve complete electrical isolation between the component cells. Previously, electrical isolation could only be achieved with hybrid, mechanically stacked structures. We report the growth, fabrication, and characterization of an AlxGa1−xAs/GaAs photovoltaic cell with an epitaxial isolation layer of semi-insulating GaAs grown by molecular beam epitaxy. This will facilitate the integration of subcells that absorb different portions of the solar spectrum onto a single substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104861
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal treatment studies of the photoluminescence intensity of porous silicon (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2814-2816 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermal annealing studies of the photoluminescence (PL) intensity and Fourier-transform infrared spectroscopy have been performed concurrently on porous Si. A sharp reduction in the PL intensity is observed for annealing temperatures (approximately-greater-than)300 °C and this coincides with desorption of hydrogen from the SiH2 surface species. A brief etch in HF can restore the luminescence of the samples annealed below 400 °C. We conclude that SiH2 is essential to the visible luminescence in porous Si.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105869
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Apple-Scoops (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1542-1542 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Apple-scoops (occasionally termed gouges) were freely used in apple-growing districts by edentulous persons to scrape small thin pieces off the fruit and thus facilitate mastication. This custom was particularly prevalent prior to the introduction into Great Britain, in 1855, of vulcanite as a base ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831542a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray Spectrographic Determination of Strontium (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1481-1481 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The instrumental conditions were: Philips X-ray spectrograph, P W 1520; tungsten target tube, 48 kV., 20 m.amp.; argon-filled Geiger counter; X-ray path evacuated; exit collimator not fitted. Samples were prepared in a manner similar to that described by Roberts, but the 'Mylar' film was not ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831481b0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of personal and class forms of the science laboratory environment inventory (1991)
    Springer
    Research in science education 21 (1991), S. 244-252 
    Details
    ISSN: 1573-1898
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General
    Notes: Abstract Existing instruments in classroom environment research have limitations when subgroups are investigated or case studies of individual students conducted. This study reports the validation and development of a personal form of the Science Laboratory Environment Inventory which is better suited to such studies. Further, systematic differences between scores on the class and personal forms of the instrument are reported along with comparisons of their associations with inquiry skill and attitudinal outcomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360478
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Relationship between severity and clinical importance of symptoms in osteoarthritis (1991)
    Springer
    Clinical rheumatology 10 (1991), S. 138-143 
    Details
    ISSN: 1434-9949
    Keywords: Clinical Metrology ; Importance ; Osteoarthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Seventeen patients with primary osteoarthritis of the knee were evaluated with respect to the severity and clinical importance of pain, stiffness and physical function during the conduct of a double-blind randomized controlled trial of flurbiprofen SR versus diclofenac sodium SR using the WOMAC Osteoarthritis Index. Mean importance scores were similar for items within the same dimension as well as between items in different dimensions. In general, low levels of correlation were noted between the severity and importance of symptoms. Analysis of individual WOMAC items within a given subscale indicated that, although highly correlated, they differed from one another. Factor analysis further supported the contention that scores from items within a subscale could be summated into subscale scores. These observations are of importance in the weighting and aggregation of items within discrete dimensions and have the potential for reducing sample size requirements for clinical trials in osteoarthritis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207652
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Improved model for the intensity of low-energy tailing in Si(Li) x-ray spectra (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 20 (1991), S. 191-197 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Accurate tail-to-peak intensity ratios are extracted from the spectra produced in a Si(Li) detector by x-rays of energies 2-10 keV. The widely used model of a surface layer of incomplete charge collection fails to explain the energy dependence of these data. The model is augmented to include loss of photoelectrons travelling back into the ICC layer from an interaction in the active silicon region; this gives excellent agreement with experiment. It is shown that the detection efficiency in the region of low x-ray energy may be deduced from the tail-to-peak ratios, together with measurement of the thicknesses of the beryllium window and the metal contact; a potential source of error in measuring the latter by the popular fluorescence technique is demonstrated.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300200408
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    Paper (German National Licenses)
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