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  • Articles: DFG German National Licenses  (2)
  • 1990-1994  (1)
  • 1975-1979  (1)
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  • Articles: DFG German National Licenses  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Suprachiasmatic nucleus neurones: Excitation and inhibition mediated by the direct retino-hypothalamic projection in female rats (1979)
    Springer
    Experimental brain research 37 (1979), S. 127-138 
    Details
    ISSN: 1432-1106
    Keywords: Suprachiasmatic nucleus neurone ; Retino-hypothalamic projection ; Electrical stimulation of the optic nerve ; Flash stimulation of the retina ; Tuberoinfundibular neurone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The suprachiasmatic nucleus (SCN) of female rats was surveyed with microelectrodes under urethane anaesthesia. In rats with bilateral transection of the optic tracts, repetitive three pulses of 100 Hz applied to the contralateral optic nerve excited 8 and inhibited 11 other of the 86 SCN units examined. Transection of the optic tract did not significantly influence frequency of occurrence of the SCN units that were excited or inhibited by stimulation of the optic nerve. Certain SCN units responded to both of contralateral and ipsilateral stimulations of the optic nerve, indicating that bilateral visual inputs converge on the same single SCN neurones. Oscillatory responses with a period of 100–200 msec were occasionally produced by stimulation of the optic nerve. Flash stimuli with relatively weak intensity, even insufficient for producing wavelets in electroretinograms, produced an excitation and inhibition in SCN units. The mean firing rates were significantly altered by either electrical or flash stimuli repeated 500 times at 0.97 Hz in those units which showed no transitory response. Some of the SCN neurones receiving visual inputs were identified to be the tuberoinfundibular neurone and some other SCN neurones were found to receive converging inputs both from the optic nerve and from the axon collaterals of tuberoinfundibular neurones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474259
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Range-pair-counting fatigue gage (1993)
    Springer
    Experimental mechanics 33 (1993), S. 242-248 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, the surface roughening phenomenon of an aluminum foil during fatigue process is utilized for monitoring of a variable amplitude stress. It is found that constant mean stress does not affect surface roughness. When the mean stress varies, however, it causes surface roughening. In such a case, the equivalent stress defined by (Σσ i α N i /ΣN i )1/α dominates surface roughness of an aluminum foil, where σ i andN i are stress amplitude and the number of cycles counted by the rangepair method, respectively, and α is a gage factor which is peculiar to the foil used. It is concluded that the aluminum foil can be used as the range-pair counting fatigue gage with high accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02322580
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    Paper (German National Licenses)
    Fulltext
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