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  • 1980-1984  (63)
  • 1940-1944  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 153-159 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 164-167 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 35 (1941), S. 603-608 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Zusammenfassung Einen einfachen und betriebssicheren Abreißbogen erhält man, wenn man der Bogengleichspannung eine Wechselspannung derart überlagert, daß der Minimalwert der resultierenden Spannung unter der Brennspannung des Bogens liegt. Es gelingt mit dieser Anordnung, bei Aluminium-Elektroden mit einer 50periodigen Wechselspannung Brenndauern von etwa 0,004 bis 0,015 s zu erzielen. Die sehr lichtstarke Entladung kann bis zu 45 min bei Aluminium aufrechterhalten werden.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 40 (1981), S. 59-70 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract This paper continues the investigation of a three-loop representation of the segmental muscle stretch reflex system introduced in a preceding communication. Frequency response characteristics were computed for open-loop conditions, control and disturbance signal inputs under a variety of conditions: (i) “in parallel” and “in series” peripheral arrangements of muscle compartments, (ii) various patterns of central connectivity, (iii) various recruitment levels of motor units, (iv) various overall reflex gains, (v) absence or presence of muscle spindle accleration sensitivity. These computations disclosed a number of mechanisms by which the nervous system might improve system stability and behaviour. These mechanisms are discussed with regard to physiological data.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 38 (1980), S. 51-61 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The multi-channel system of the segmental muscle stretch reflex arc is modelled as an arrangement of two or three parallel “component” loops coupled to each other at spinal and at muscle level. Such a model is thought to be more realistic than the usually adopted representation of the stretch reflex as a single negative feedback loop. Anatomical and physiological data were taken from the literature for an extensive simulation of the compound system with special reference to the problem of its stability. Particular emphasis was put on the question of which kind of central (spinal) connectivity is appropriate to best reduce the risk for instability which arises easily in certain system configurations. This paper describes the system and presents simple introductory computations apt to demonstrate the problems the physiological system has to cope with.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 46 (1983), S. 217-228 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The spinal α-motoneurone-Renshaw cell system was simulated by a meshed system of three principal negative feedback loops interconnected via “cross”-feedback pathways. Three types of α-motoneurone (MN): S-type, FR-type, and FF-type MNs, and their differing connections to and from Renshaw cells (RCs) were taken into account. The dynamic behaviour of RCs was taken from data provided by Cleveland and Ross (1977) and assumed to be given by a transfer function with one zero and two poles whose time constants τi depended on the overall amount of excitatory input to RCs. Also, the static gain of recurrent inhibition was taken to decrease with increasing excitatory input from α-MN axon collaterals (Cleveland et al., 1981) and to be depressed by spinally descending motor command signals. S-type MNs as well as F-type MNs were assumed to have high-pass characteristics though with slightly different cut-off frequencies. The closed-loop frequency responses of each sub-pool of MNs, S, FR, and FF, at three different levels of recruitment of these sub-pools, were calculated and shown to change significantly with recruitment level. These changes were essentially due to two reasons: firstly, to the general reduction of static gains within the recurrent inhibitory pathways with increasing motor output (recruitment), and secondly, to the increasing complexity of the whole network by recruitment of each new MN type. The particularly strong effect of the latter factor could easily be demonstrated by a comparison of the frequency responses of the MN types when these were, firstly, integrated into the network at their particular level of recruitment, and when they were, secondly, hypothetically assumed “isolated” from the remaining network, i.e., when subjected only to “self-inhibition”, the cross-inhibitory links to other MN types being cut. These results illustrate that the dynamic behaviour of α-MNs submitted to an inhomogeneously distributed recurrent and variable inhibition are not invariant, but depend upon the variable characteristics of a complex MN-RC network. This suggests that an important physiological function of recurrent inhibition via Renshaw cells, particularly of its inhomogeneous distribution, may be to adjust the dynamic MN sensitivity to the particular requirements prevailing at different motor output levels.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 48 (1983), S. 159-163 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract This paper outlines an extension of Krausz' (1975) approach to nonlinear analysis of physiological systems with random impulse train inputs. This extension concerns multiple (here two) inputs and spike train outputs in addition to analogue outputs. The respective theoretical formula are given, and the approach is illustrated by experimental data relating to the nonlinear interaction of cat motor units activated with random pulse trains. As outputs are considered muscle tension (as an example for an analogue signal) and discharge frequency of a Ia fibre (as an example for a spike output).
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 13 (1943), S. 365-372 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Die geprüften Bakterien (Azotobacter chroococcum, Bacillus glycinophillus) und Pilze (Aspergillus niger, Trichoderma viridis und Fusarium spec.) vermögen Pyridin nicht als Stickstoffquelle zu verwerten, wie die quantitative Pyridinbilanz zeigte. Doch wird die anfängliche Entwicklung von Azotobacter durch Gegenwart von Pyridin beschleunigt, es tritt jedoch eine frühere Autolyse ein. Insgesamt wird die Stickstoffbindung nicht beeinflußt. Es wäre zu prüfen, ob Pyridin bei diesem Organismus als Wasserstoffüberträger wirkt.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 16 (1982), S. 251-257 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Werden in einem beheizten Verdampferrohr die Randbedingungen so geändert, daß sich der Ort der Siedekrise in Strömungsrichtung verschiebt, so kann dies vorübergehend zu einer starken Reduktion des Wärmeübergangskoeffizienten im Post-Dryout-Gebiet führen. Es werden die an einem Hochdruckkreislauf gewonnenen zeitlichen Verläufe der Wandtemperaturen analysiert, wie sie bei Absenkung des System-druckes bzw. der Enthalpie der Strömung am Eintritt in das Versuchsrohr auftreten. Anhand der Siedekurve werden die beobachteten Wandtemperaturverläufe interpretiert. Durch Nachrechnung der Experimente mit einem dynamischen Rechen-programm lassen sich die unterschiedlichen Effekte, die während der Transiente auftreten, separieren.
    Notes: Abstract A change in the boundary conditions in a heated evaporator tube (moving the location of the boiling crisis downstream) could lead to a strong reduction in the heat transfer coefficient in the Post-Dryout region. The analyzed wall temperature data were obtained in a high pressure test loop by reducing the system pressure, or the enthalpy at the test section inlet. The wall temperature time histories were interpreted using the boiling curve. The various effects occurring during the transient could be separated by recalculating the tests with a dynamic simulation computer program.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 1984-11-01
    Print ISSN: 0031-9228
    Electronic ISSN: 1945-0699
    Topics: Physics
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