摘要:

AbstractIn two earlier papers (BRÄUER and RÄDLER 1986, 1987) the evolution of a magnetic field was considered which pervades an electrically conducting fluid and its non‐conducting surroundings. A construction principle for Green's functions of the corresponding initial value problem was proposed, and worked out for the case in which the fluid fills a spherical region. Now the principle is applied to the case of a fluid body occupying a half‐space. Green's functions are constructed for arbitrary motions of the fluid. More concrete results are derived for shear flow, and explicit expressions of Green's functions are given for rigid body m

ISSN:0004-6337    

DOI:10.1002/asna.2113090102

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113090103

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractPhenomenological models of cosmic phase transitions are presented. We consider phase transitions (i) with fixed initial and final states or (ii) in the relaxation time approximation. The Friedmann equations are solved and the entropy production due to the non‐equilibnum transition is calculated for a bag model equation of state. Numerical examples are given for the confinement transition, but the formulae presented apply directly to the GUT transition, to

ISSN:0004-6337    

DOI:10.1002/asna.2113090104

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractWe derive the Wheeler‐de Witt equation for the scalar field of massm>0 in a Bianchi‐type I universe. We argue that classical trajectories become possible ath2⩽ αtp‐2,hbeing the mean Hubble value andtpthe Planck time. We feel justified to set the numerical constant α ≈︁ 1. We discuss this condition in geometrically invariant quantities and compare it with ⩽tp‐4. The proposed quantum boundary of classical trajectories represents a 3‐dimensional sphere in the 4‐space of the dynamical system. Equipartition of the initial energy over field (m

ISSN:0004-6337    

DOI:10.1002/asna.2113090105

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113090106

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe orbital elements of the spectroscopic binary 53 Cam were revised using 136 radial velocity measurements. The positions in the vicinity of the periastron predicted for the secondary under the assumption of the spectroscopic orbital elements do not agree with those found by speckle interferometric observations. Nevertheless, we try to estimate the mass of the secondary and the dimensions of the binary system.

ISSN:0004-6337    

DOI:10.1002/asna.2113090107

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113090108

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractMV Lyrae was studied on about 2000 photographic plates of the Moscow, Odessa and Sonneberg collections. A brief review of these results in comparison with literature data is given. The object might be a unique system, entering the period gap. Outbursts are observed in the minimum state, which may be possibly explained by the trigger mechanism for the radiation‐induced mass outflow from the secondary, underfilling its Roche lob

ISSN:0004-6337    

DOI:10.1002/asna.2113090109

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractModel calculations of theS‐component accounting for the emission from uniform sunspot and inhomogeneous plage regions are applied to a prediction of the spectral distribution of the degree of circular polarization at millimetre waves. The results are compared with observations adopted from the literature and a sufficient agreement between model computation and measurement can be slated. However, observations with higher spatial resolution than presently available are needed in order to check the predicted fine structures and to verify details of the applied mode

ISSN:0004-6337    

DOI:10.1002/asna.2113090110

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractComparing absolute proper motions of stars obtained by different methods from observations with the Tautenburg Schmidt telescope (134/200/400), the Kiev long focus astrograph (40/550) and the Pulkovo normal astrograph (33/350) the external accuracy of the Tautenburg absolute proper motions was examined. It agrees well with the Tautenburg internal accuracy which is known from earlier investigations as 0″.7 per century. That accuracy was now achieved for all AGK3 stars in the M33 field including the bright stars from 7mto 10

ISSN:0004-6337    

DOI:10.1002/asna.2113090111

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY