摘要:

AbstractAll exact solutions of the Einstein‐Maxwell equations with a cosmological term for the case, when the Hamilton‐Jacobi equations may be integrated by the method of separation of variables by means of a complete isotropic set of integrals of motion are fo

ISSN:0003-3804    

DOI:10.1002/andp.19834950402

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractA generalisation of Onsager's reciprocal relations has been proved by phenomenological methods. It is pointed out that Gyarmati's variational principle is valid in case of nonlinear constitutive equations, too.

ISSN:0003-3804    

DOI:10.1002/andp.19834950403

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractWithin the framework of the Mach‐Einstein‐doctrine as formulated by TREDERthe thermodynamical quantities and the relations between them are derived for a simple N‐particle‐gas in equilibrium by means of a statistical‐mechanical description of the particle system. Because of the induction of inertia for each particle due to the gravitational interaction with all other particles the corresponding equations of state are modified essentially in s

ISSN:0003-3804    

DOI:10.1002/andp.19834950404

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractAus der Gleichung der Turbulenzenergie bei zweidimensionaler Turbulenz folgt neben dem Transfer der Enstrophie und Turbulenzenergie in Richtung großer Wellenzahlen ein Energie‐ nd Enstrophie‐Transfer in Richtung kleiner Wellenzahlen für einen Bereich O

ISSN:0003-3804    

DOI:10.1002/andp.19834950405

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractIt is explained, that the basic notion for a geometric picture of continuum mechanics is a four dimensional material manifold. The four dimensional mechanical affinity is then the unified field for any defect distribution in the general time dependent case. The minimal number of geometric relations being valid for any continuum is formulated as a set of pure affine relations. The state variables of the theory are additional tensor fields as e.g. deformation defining a metric. A material with a well defined deformation has a Newton‐Cartan structure. Only if defects are included into the dynamical determination by additional equilibrium conditions, the theory has a pseudo relativistic structur

ISSN:0003-3804    

DOI:10.1002/andp.19834950406

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThe Einstein‐Podolsky‐Rosen “gedanken‐experiment” does not imply non‐local interactions or an “action‐at‐a‐distance”.Contrary, the EPR proves the measurements at one particle does not have influences at canonical variables of the other particles if the quantum‐mechanical commutation relations are true.But, the EPR implices correlations between the particles which come in by “subjective knowledge”. These correlations are a priori informations about the relative motion or, complementarily, about the motion of the center of mass. The impression of an action‐at‐a‐distance is produced by the use of usual particle coordinates in the EPR‐arrangements.The discussion of the Einstein‐Podolsky‐Rosen “gedanken‐experiment” (EPR) has been going on over fifty years. EINSTEIN, PODOLSKY, and ROSENformulated their famous paradox in 1935, and in the discussion between N. BOHR(1935, 1949) and A. EINSTEIN(1936, 1948); A. EINSTEIN(1948) made his point that the EPR implied an “action‐at‐a‐distance” for quantum‐mechanical particles (without obvious classical interactions). His argument is the starting point for the recent

ISSN:0003-3804    

DOI:10.1002/andp.19834950407

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractUsing first integrals corresponding to a given Killing vector field we derive the general solution of the equation of geodesic deviation for static spherical symmetric space‐times. The method is applied to Schwarzschild space‐t

ISSN:0003-3804    

DOI:10.1002/andp.19834950408

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractUsing Lehmberg's master equation and taking into account dipole‐dipole near‐field interaction the time‐dependent intensity pattern, intensity – and angular correlations of the cooperative spontaneous radiation from an initially fully excited system of three identical two‐level atoms are calculated. The intensity pattern developes lobes in different directions at different times in such a way that contrary to the two‐atom system the spatial distribution of the total number of the emitted photons differs from that of the single‐atom radiation pattern. In particular three atoms placed in proper distances on a straight line emit preferentially their energy along this line. At the beginning of the emission process the probability to find two photons simultaneously in the same (or geometrical equivalent) direction is always highest but in the course of time, contrary to the two‐atom case, it may well happen that the probability of finding two photons in quite different directions become

ISSN:0003-3804    

DOI:10.1002/andp.19834950409

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractA master equation is derived to describe the kinetics of the phase transition from the liquid to the perfect f.c.c. crystalline state, and a straightforward calculation of the kinetic coefficient in terms of microscopie parameters is given for one‐component Lennard‐Jones systems just above the triple point. The considerations are based on an effective lattice model description of the interface structure and the calculation of elementary transition probabilities starting from the molecular theory of thermal equilibrium which is given in earlier papers, extending these results to non‐equilibrium by the local equilibrium principle. The calculated crystal growth velocity versus supercooling is about 10−3m/sK which agrees with experimental data for some organic substances, but it is to small by a factor 101to 102for metals, probably for reasons of a rapid growth velocity enhancement due to an increasing defect density under a strong supercooling regime of 10–100 K, as

ISSN:0003-3804    

DOI:10.1002/andp.19834950410

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractThe Method of HERTZconsists in the solution of the electromagnetic field equations by the help of a superpotential. We analyse the applicability of this method to more general field equations.

ISSN:0003-3804    

DOI:10.1002/andp.19834950411

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY