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1.
We consider the one-dimensional steady-state semiconductor deviceequations modelling a pnpn device. There are two relevant scalingsof the equations corresponding to small and large applied voltages.In both scalings, the semiconductor equations can be consideredas singularly perturbed. It turns out that the small-voltagescaling breaks down for current values between two saturationcurrents. In that interval, the large-voltage scaling has tobe employed. For both scalings, we derive the first-order termsof an asymptotic expansion and show that the reduced problemhas a solution. An example verifies that the current-voltagecurves obtained have the expected qualitative structure. 相似文献
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K.D. Hildenbrand R. Bock H.G. Bohlen P. Braun-munzinger D. Fick C.K. Gelbke Ursula Weiss W. Weiss 《Nuclear Physics A》1974,234(1):167-184
Angular distributions of the elastic scattering of 28Si on 29Si and 30Si have been measured for incident beam energies at E = 65 and 70 MeV with a time-of-flight spectrometer for heavy ions. At 70 MeV the neutron transfer 30Si(28Si, 29Si)29Si was observed in addition to the elastic channel. The pronounced oscillations in the elastic scattering distributions are interpreted as being due to an elastic transfer of neutrons between the colliding nuclei during the scattering process. This assumption is in accordance with some general features of the data and allows for the extraction of spectroscopic factors of the transferred neutrons. 相似文献
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P. Braun-Munzinger C. K. Gelbke H. L. Harney D. Agassi 《Zeitschrift für Physik A Hadrons and Nuclei》1975,273(1):57-58
The symmetry property of the transition matrix for a reaction producing an isobaric multiplet (or identical particles) is derived from the generalized Pauli principle without any specific assumptions concerning the reaction mechanism. In contrast to previous predictions it is shown that for odd partial waves in the exit channel the cross section will generally not vanish at Θ = π/2 if the channel spin projections of the initial and final channels may be different. 相似文献
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A. Gamp P. Braun-Munzinger C. K. Gelbke H. L. Harney H. O. Bohlen W. Bohn K. D. Hildenbrand J. Kuzminski W. Von Oertzen I. Tserruya 《Nuclear Physics A》1975,250(2):341-350
Elastic scattering and one-nucleon transfer reactions induced by 16O have been investigated in the energy region 45–60 MeV on targets of 26Mg, 27Al, 30Si and 48Ca. Angular distributions were measured in the angular range 4°–40°. Optical model parameters were derived from the elastic scattering data and the transfer reaction data were analysed using both no-recoil and full-recoil DWBA codes. In the case of proton transfer reactions on 48Ca, good agreement was obtained between the data and the DWBA calculations while the data for the lighter targets could not be satisfactorily reproduced. The oscillatory pattern of the angular distributions is discussed in terms of the three-parameter model of Kahana, and it is found that the model qualitatively explains the observed transition from smooth to oscillatory angular distributions. 相似文献
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Background
The effects of negative emotion on different processing periods in spatial and verbal working memory (WM) and the possible brain mechanism of the interaction between negative emotion and WM were explored using a high-time resolution event-related potential (ERP) technique and time-locked delayed matching-to-sample task (DMST). 相似文献7.
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