排序方式: 共有47条查询结果,搜索用时 15 毫秒
1.
Yu. V. Pyatkov V. V. Pashkevich W. H. Trzaska G. G. Adamian N. V. Antonenko D. V. Kamanin V. A. Maslov V. G. Tishchenko A. V. Unzhakova 《Physics of Atomic Nuclei》2004,67(9):1726-1730
An analysis of the preferable fission path manifesting itself as a fine structure of the total kinetic energy-mass distribution of the fission fragments compelled us to put forward an absolutely new shape of the fissioning system on the descent from the fission barrier. It is a multicomponent nuclear molecule constituted by two magic clusters and a torus-like neck between. 相似文献
2.
We examine an inverse problem of determining the right-hand side (the source function) in a parabolic equation from integral overdetermination data. By a solution to a parabolic equation we mean a weak solution, and the right-hand side in this equation can be a distribution of a certain class. Under some conditions on the data of the problem, we demonstrate that this inverse problem is well posed and, in particular, some stability estimates hold. 相似文献
3.
S. G. Pyatkov 《Differential Equations》2017,53(10):1352-1363
We consider the generalized solvability of convection–diffusion systems and study the inverse problem of determining the right-hand side (the source function) of such a system from integral overdetermination data. The solution of a parabolic system is understood in the generalized sense, and distributions of certain classes are allowed as right-hand sides. Under certain conditions on the problem data, we show that the inverse problem is well-posed in the Sobolev classes. 相似文献
4.
In the article, we examine well-posedness of the problem on determining the source functions in a linearized system of heat and mass transfer. The overdetermination conditions are the values of concentrations on some surfaces or at separate points of the spatial domain. 相似文献
5.
6.
Siberian Mathematical Journal - 相似文献
7.
S. G. Pyatkov 《Journal of Applied and Industrial Mathematics》2011,5(3):417-430
Under study are the inverse problems of determining the right-hand side of a particular form and the solution for elliptic
systems, including a series of elasticity systems. (On the boundary of the domain the solution satisfies either the Dirichlet
conditions or mixed Dirichlet-Neumann conditions.) We assume that on a system of planes the normal derivatives of the solution
can have discontinuities of the first kind. The conjugating boundary conditions on the discontinuity surface are analogous
to the continuity conditions for the fields of displacements and stresses for a horizontally laminated medium. The overdetermination
conditions are integral (the average of the solution over some domain is specified) or local (the values of the solution on
some lines are specified). We study the solvability conditions for these problems and their Fredholm property. 相似文献
8.
We study solvability of inverse problems of finding the right-hand side together with a solution itself for vector-valued
parabolic and elliptic equations. The usual boundary conditions are supplemented with the overdetermination conditions that
are the values of a solution on some system of surfaces. 相似文献
9.
S. P. Tretyakova Yu. E. Penionzhkevich H. -G. Ortlepp V. V. Trofimov Yu. V. Pyatkov Yu. M. Kulakov 《Radiation measurements》1997,28(1-6):303-304
Investigation of the 246Cm spontaneous ternary decay into nearly equal clusters using polyethyleneterephthalate track detectors has been carried out. The possibility of ternary cluster decay has been found out to be of less than 10−6 with respect to all fission modes of 246Cm. 相似文献
10.
Several levels which develop in GaAs before and after proton irradiation were derived from the photoconductivity spectra. It is assumed that the majority of the levels which are observed after irradiation are related to uncontrollable impurities or to impurities which are activated during irradiation. The GaAs Cu samples were used to show that it is possible to activate admixtures by proton irradiation. It was established that the absolute photoconductivity is reduced during irradiation by the development of recombination centers. The average activation energy of these centers was estimated at 0.06 eV. Lattice defects are the recombination centers.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 34–40, February, 1972. 相似文献