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  • 1
    Electronic Resource
    Electronic Resource
    An extended magnet in a passive dI/dt limiter : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6874-6876 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article examines a composite magnetic device which has the potential to function as a rate of current change (dI/dt) limiter. A possible application of such a device is to protect voltage-source-fed systems, either ac or dc, from overcurrents during fault situations. The operation of this dI/dt limiter is discussed, and performance equations are derived. Results obtained from this analysis are compared to a set of finite element simulations. An improvement to the basic design is suggested, in which the permanent magnet slices are extended in order to decrease the amount of leakage flux surrounding the dI/dt limiter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358098
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A three-material passive dI/dt limiter : The 6th joint magnetism and magnetic materials (MMM)−intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6871-6873 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article introduces and examines a composite magnetic device (called a dI/dt limiter) which functions as a bilevel inductor. For dc currents below a designed threshold level, the inductance and resistance of the device is quite low. However, the inductance of the device increases dramatically for all currents greater than the threshold level. In this article a set of performance equations are derived which describe the inductance of the dI/dt limiter as a function of current. The data obtained from these performance equations are compared to the results of a set of finite element simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358097
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gibberellin-enhanced transcription by isolated nuclei from cucumber hypocotyls (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 82 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Nuclei isolated from apical 1 cm (gibberellin-responsive region) of dark grown cucumber (Cucumis sativus L. cv National Pickling) hypocotyls and purified on Percoll step gradients were capable of in vitro transcription; however, only nuclei from the upper regions of the gradient gave GA4-enhanced transcription. Addition of GA4 altered the transcriptional activity in favor of RNA polymerase II, from 50% in control to more than 90% in GA4-treated nuclei. The GA4-enhanced transcription was rapid and did not require extraction of nuclei in a medium with exogenous GA4 or preincubation of nuclei in GA4. Addition of [3H]GA4-binding cytosolic protein to nuclei increased the overall transcription but did not affect the GA4-enhanced transcription. Receptor-binding assay indicated that these nuclei contain [3H]GA4-binding sites which are heat-labile and bound to nuclear matrix. Also, the nuclei seem to contain an inhibitor of GA4-enhanced transcription which is sensitive to heat and removed by repeated washings. Nuclei from the non- responsive basal region of the hypocotyl or from the apical region of cucumber hypocotyls grown at 34°C did not show GA4-enhanced transcription.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb02945.x
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  • 4
    Electronic Resource
    Electronic Resource
    Os odontoideum in identical twins: perspectives on etiology (1993)
    Springer
    Skeletal radiology 22 (1993), S. 525-527 
    Details
    ISSN: 1432-2161
    Keywords: Os odontoideum ; Atlas and axis, abnormalities ; Atlas and axis, fractures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Most authorities favor the hypothesis of an acquired etiology of os odontoideum. We present the cases of identical twin sisters with os odontoideum in association with a congenital partial fusion of the posterior elements of the second and third cervical vertebrae, and discuss the implications. We believe that this is the first report of familial os odontoideum in a context which suggests a genetic etiology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209102
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    Paper (German National Licenses)
    Fulltext
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