摘要:

AbstractSome general properties of coherent states of a particle in quantum mechanics are discussed and examples of relativistics coherent states of an electron moving in a steady and homogeneous field and in a non‐stationary external field of special kind are presented. In particular cases this field may be a plane wave, a Redmond field (a superposition of plane wave and homogenous magnetic field), a superposition of a Redmond field and a longitudinal electric field or other physically interesting field

ISSN:0003-3804    

DOI:10.1002/andp.19834950102

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractNucleation is one of the fundamental types of forming stable dissipative nonequilibrium structures in metastable initial states. The nucleation process of a bistable chemical reaction system is investigated. First a microdroplet with radiusR0of the new state imbedded in the parent one is formed by a local particle number fluctuation. The radius of the microdropletR(t)fluctuates due to the interference of reaction and diffusion. IfR(t)considerably exceeds a critical valueRkthe droplet starts to grow deterministically. The mean nucleation time of one droplet in weakly supersaturated systems is calculated using the concept of the mean first passage time.

ISSN:0003-3804    

DOI:10.1002/andp.19834950103

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThe Klimontovich Theory which yields the effective turbulent viscosity as a linear function of the Reynolds number is compared with experimental data. The new theory seems to be able to describe the observed effective viscosity of hydrodynamic vortices and after introducing some modifications the flow in tubes up to very high Reynold numbers.

ISSN:0003-3804    

DOI:10.1002/andp.19834950104

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractAusgehend von den Maxwellgleichungen wird der Einfluß einer dünnen, nichtlinearen optischen Schicht in einem Wellenleiter auf die Ausbreitung eines Mono‐TE‐Modenimpulses untersucht. Die Impulsamplitude gehorcht einer nichtlinearen Schrödingergleichung (NLS), die wellenleiter‐ und schichtspezifische Parameter enthält und Anlaß zu Solitonen im nichtlinear beschichteten Wellenl

ISSN:0003-3804    

DOI:10.1002/andp.19834950105

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractDie Dynamik und Thermodynamik großer kosmischer Systeme ist fast unabhängig von den besonderen Theorien über die Gravitation. Nur die Feinstruktur der Kosmologie und Kosmonogie reflektiert die speziellen Hypothesen. Diese Neutralität gegenüber den konkreten Gravodynamiken ist die Konsequenz der fundamentalen Eigenschaften der Gravitation: Der Prinzipien der Äquivalenz von Trägheit und S

ISSN:0003-3804    

DOI:10.1002/andp.19834950106

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractWe derive a class of exact solutions of Mathisson‐Papapetrou equations of motion for spinning test particles. The world lines of the particles are those of the so‐called locally non‐rotating observers in Kerr spac

ISSN:0003-3804    

DOI:10.1002/andp.19834950107

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractIt is shown that the experimentally observed velocity profiles and drag coefficients may be explained on the basis of autocatalytic models which lead to reaction‐diffusion equations for the exchange quantity. The first (zero) solution of these equations corresponds to the laminar flow and the second one (different from zero) corresponds to the turbulent flo

ISSN:0003-3804    

DOI:10.1002/andp.19834950108

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThe Migdal‐Makeenko equation differs explicitely in the abelian and nonabelian case for simple smooth contours already. This is due to endpoint singularities of gauge noninvariant functionals which appear in the nonabelian equation providing anomalous finite contributions in the course of renormalization. Corresponding results are discussed for nonsimple contour

ISSN:0003-3804    

DOI:10.1002/andp.19834950109

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractReaction‐Diffusion‐Systems with charged particles are considered. Conditions for the appearance of dissipative structures because of disturbances of an uniform initial stationary state in continuous and simple compartment systems are derived. As an example the appearance of a dissipative structure is demonstrated in a simple capacitor model. Based on this effect nonequilibrium electrical cells could be develo

ISSN:0003-3804    

DOI:10.1002/andp.19834950110

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

ISSN:0003-3804    

DOI:10.1002/andp.19834950101

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY