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1.
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G. Lunge A. Zeckendorf H. Wolpert H. Trautzsch J. Rosenthal O. Schulz W. Ohlmüller M. Müller J. B. Cohen G. Appleyard Fl Kratschmer E. Wiener Henriet W. Fossek M. Teich F. Clowes N. P. Schierbeck E. Cramer A. v. Bibra G. Defren Renk Hilger E. v. Raumer G. Gaglio Merget J. Uffelmann L. A. Nekam J. Archarow Kijanicin L. Eisenlohr Cl Fermi C. Arens H. Wegmann E. Knorr J. König und A. Bömer 《Fresenius' Journal of Analytical Chemistry》1897,36(1):329-340
Ohne Zusammenfassung 相似文献
3.
We study in this paper a free boundary value problem ( FB ), where a region Go in R 3 is determined by the condition that there exists a vector field vo in Go which satisfies div vo = eo, curl vo = go in Go and vo = E on the boundary ?Go with a given scalar function eo and given vector fields go and E. We give two equivalent formulations for this problem. Then we characterize the solutions by a non-linear integral equation. In order to solve the latter by a Newton method we linearize this equation. We investigate the ensuing linear integral equation. In case of axisymmetric configurations this is a singular integral equation whose index can be easily determined from the given data. We obtain a related equation, if we try to construct a field v in a region G which is on the boundary perpendicular to a given field B . Finally we use this method to investigate an astrophysical problem, which arises in the theory of pulsar magnetospheres. 相似文献
4.
Free boundary problems are considered, where the tangential and normal components ut and un of an otherwise unknown plane harmonic vector field are prescribed along the unknown boundary curve as a function of the coordinates x, y and the tangent angle θ. The vector field is required to exist either in the interior region G+ or in the exterior G?. In each case the free boundary is characterized by a nonlinear integral equation. A linearised version of this equation is a one-dimensional singular integral equation. Under rather general hypotheses which are easy to check, the properties of the linear equation are described by Noether's theorems. The regularity of the solution is studied and the effect of the nonlinear terms is estimated. A variant of the Nash-Moser implicit-function theorem can be applied. This yields local existence and uniqueness theorems for the free boundary problem in Hölder-classes H2+μ. The boundary curve depends continuously on the defining data. Finally some examples are given, where the linearised equation can be completely discussed. 相似文献
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Rainer Kress Hans Ludwig De Vries Rudolf Wegmann 《Linear algebra and its applications》1974,8(2):109-120
For the eigenvalues λi of an n × n matrix A the inequality is proved, where and 6 ● 6; denotes the euclidean norm. Conditions for equality are stated. 相似文献
7.
Rudolf Wegmann 《Archiv der Mathematik》1980,34(1):69-74
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Ohne Zusammenfassung 相似文献
10.
G. Wegmann 《Zeitschrift für Physik A Hadrons and Nuclei》1968,211(3):235-249
The ground state properties of nuclear matter are calculated in theΛ 11-approximation1. A nucleon-nucleon interaction of the Yamaguchi-type and thes-wave part ofTabakin's potential have been considered. In both cases too large values for the density of nuclear matter and the binding energy per nucleon are found. The momentum distribution turns out to be very small for momenta larger than the Fermi momentum. 相似文献