Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences

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Das Verhalten von p-n-Gleichrichtern bei hohen Durchlaßbelastungen
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 11 Số 6 - Trang 498-510 - 1956
A. Herlet
Das Verhalten eines modellmäßig vereinfachten p-n-Gleichrichters bei hohen Durchlaßströmen, d. h. außerhalb des Gültigkeitsbereiches der SHocKLEYschen Theorie, wird untersucht. Es wird wesentlich beherrscht von einem „unbegrenzten“ Anwachsen beider Trägerkonzentrationen mit √i über die Dotierungskonzentration hinaus. Der Spannungsabfall über den Bahngebieten wächst daher nur mit √i, währen...... hiện toàn bộ
Field-dependent Mechanism of Anomalous Proton Conductivity and the Polarizability of Hydrogen Bonds with Tunneling Protons
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 25 Số 5 - Trang 627-634 - 1970
E. G. Weidemann, G. Zundel
The displacement of the excess charge of the proton in acid solutions is caused by a structure migration of groupings H5O2 + or H9O4 + . The processes which take place during structure migration are discussed on the basis of resul...... hiện toàn bộ
Predator-dependent transmissible disease spreading in prey under Holling type-II functional response
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 76 Số 6 - Trang 479-492 - 2021
Dipankar Ghosh, P. K. Santra, A. A. Elsadany, G. S. Mahapatra
Abstract This paper focusses on developing two species, where only prey species suffers by a contagious disease. We consider the logistic growth rate of the prey population. The interaction between susceptible prey and infected prey with predator is presumed to be ruled by Holling type II and I functional response, respectively. A healthy prey is inf...... hiện toàn bộ
Über die Berechnung von Franck-Condon-Integralen
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 15 Số 2 - Trang 123-128 - 1960
Samuel S. Koide
A new method of approach is proposed for the problem of electronic transitions accompanied by the excitation of molecular or crystal vibrations. The Hamiltonian of the normal vibrations is expressed in terms of the so-called creation and annihilation operators, and the change in the equilibrium nuclear distances and vibrational frequencies are represented by transformations which are also ...... hiện toàn bộ
Exakte Berechnung von Franck-Condon-Integralen
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 14 Số 1 - Trang 81-91 - 1959
Max Wagner
Bei optischen und strahlungslosen Übergängen zwischen Elektronenzuständen an einem Kristallstörzentrum werden die Ruhelagen der Gitteroszillatoren (d. h. die Nullpunkte der Normalkoordinaten) verschoben. Der Oszillatoranteil der FRANCK-CONDON-Integrale solcher Übergänge wird exakt berechnet, zunächst unter der Annahme, daß die Oszillatorfrequenzen sich bei dem Übergang nicht ändern. Diese ...... hiện toàn bộ
Peristaltic Transport of a Hyperbolic Tangent Fluid Model in an Asymmetric Channel
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 64 Số 9-10 - Trang 559-567 - 2009
S. Nadeem, Safia Akram
In the present analysis, we have modeled the governing equations of a two dimensional hyperbolic tangent fluid model. Using the assumption of long wavelength and low Reynolds number, the governing equations of hyperbolic tangent fluid for an asymmetric channel have been solved using the regular perturbation method. The expression for pressure rise has been calculated using numerical integr...... hiện toàn bộ
Topological Studies on Heteroconjugated Molecules. III. On the Law of Alternating Polarity
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 36 Số 10 - Trang 1112-1114 - 1981
Iván Gutman
The π-electron charge Qs h in alternant conjugated systems with one heteroatom is considered. A complete proof of the law of alternating polarity is presented. The integral expression for Qs h is decomposed into a number of relatively simple terms, which give some insight...
Notizen: Gewinnung eines praktisch trägerfreien Radio-Kupfer- Präparates 64Cu von hoher Aktivität aus Cu-Phthalocyanin
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 5 Số 11 - Trang 629-630 - 1950
W. Herr, Hans Götte
Symmetrieeigenschaften der Energiebänder der Chalkopyritstruktur
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 19 Số 7-8 - Trang 844-850 - 1964
R. Sandrock, J. Treusch
Die Ausnutzung gruppentheoretischer Methoden gestattet eine Untersuchung von Bandstrukturen allein auf Grund der Kristallsymmetrie. Diese Methoden werden auf ternäre Halbleiter mit Chalkopyritstruktur angewandt. Dazu werden die Charaktertafeln aller Wellenvektorgruppen zur Raumgruppe D12 2d aufgestellt. Aus ihnen werden qualitativ...... hiện toàn bộ
Experimental Investigation of Spatial Pattern Formation in Physical Systems of Activator Inhibitor Type
Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences - Tập 43 Số 1 - Trang 17-29 - 1988
Hans-Georg Purwins, Christian Radehaus, Jürgen Berkemeier
Abstract We investigate experimentally stationary stable states of activator (w) inhibitor (υ) type systems corresponding to the reaction diffusion equation δ · υ̇ = Δυ + w - υ; ẇ = σ Δw + f(w) - υ; δ, σ = const > 0 with f(w) monotonically increasing for small and decreasing for la...... hiện toàn bộ
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