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  • 2005-2009  (1)
  • 1985-1989  (2)
  • 1960-1964  (1)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    Verrucous Carcinoma Treated With Etretinate (1987)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of dermatology 26 (1987), S. 0 
    Details
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-4362.1987.tb00198.x
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Thyroid (1960)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physiology 22 (1960), S. 615-650 
    Details
    ISSN: 0066-4278
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ph.22.030160.003151
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Closed-loop control of switched reluctance generators (2005)
    Bradford : Emerald
    Compel 24 (2005), S. 662-681 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Purpose - This paper deals with closed-loop control of a switched reluctance generator (SRG). Design/methodology/approach - The control objective when generating is to maintain the dc link voltage at the required value while achieving maximum efficiency. Three possible control schemes are presented and their performance is examined by testing on an experimental 12/8 three-phase SRG. Findings - A very simple control scheme that requires no prior characterisation of the SRG, an approach based on the use of an inverse machine model and finally, a control scheme that is aimed at achieving optimal efficiency are described and experimental results for all three are presented. Research limitations/implications - The inverse machine model control scheme and the optimal efficiency control scheme require operation at a constant voltage reference for accurate operation (although this is the case for many generator applications). Possible future research might include the expansion of these control schemes to operation with a variable voltage reference. Practical implications - The importance of maximising efficiency is emphasised with a clear method of deriving the optimal efficiency firing angles described. Originality/value - This paper provides a good overview of SRG operation through the experimental implementation of three separate closed-loop voltage control schemes, each of which is described in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640510571156
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Growth mechanisms of modified eutectic silicon (1987)
    Springer
    Journal of materials science 22 (1987), S. 4504-4513 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Transmission electron microscopy has been used to study the growth mechanism of silicon in modified aluminium-silicon eutectic alloys. In agreement with earlier studies a high density of thin {1 1 1 } faults was observed in silicon modified by relatively large amounts of sodium or strontium. High-resolution microscopy showed that these faults were a mixture of thin twins and stacking faults, the inter-fault spacing being at least ten times the twin width. Because modified silicon is thought to grow by the twin re-entrant edge mechanism, the thin twins were examined in relation to the shape of the modified silicon dendrites and the solidified growth interfaces. It was concluded that the thin faults were not deformation twins resulting from either thermal contraction stresses or mechanical grinding during specimen preparation. No direct evidence was found to support the re-entrant edge mode of growth in modified silicon. Instead it is suggested that the interface may appear macroscopically non-faceted, as in the more general Lateral Microscopic Growth mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132053
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    Paper (German National Licenses)
    Fulltext
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