全文获取类型
收费全文 | 83篇 |
免费 | 0篇 |
国内免费 | 2篇 |
专业分类
化学 | 8篇 |
力学 | 12篇 |
数学 | 26篇 |
物理学 | 39篇 |
出版年
2021年 | 1篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 7篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2010年 | 8篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 5篇 |
2006年 | 2篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1988年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 3篇 |
1969年 | 2篇 |
1968年 | 2篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有85条查询结果,搜索用时 234 毫秒
1.
The awaited dark matter (DM) neutralino annihilation signal from the galactic halo crucially depends on the presence of small-scale
clumps. A mass function of the DM small-scale clumps is calculated in the standard cosmological scenario. The final distribution
of clumps in the Galaxy is influenced by their tidal destruction. The basic sources of clump destruction are (i) clumps of
larger scales, (ii) the gravitational field of the galactic disk, (iii) the stars in the galactic bulge, and (iv) the stars
in the galactic halo. The destruction of clumps due to their mutual tidal interactions is important at earl stages of hierarchical
clustering and the galactic halo formation. The clumps surviving through the hierarchical clustering are continuously destroyed
by interactions with the galactic disk and stars. It is shown that, among the Moon or Earth mass DM clumps surviving through
the hierarchical clustering, only 20% will further survive near the Sun’s position mainly because of the tidal destruction
by the galactic disk. This reduction of DM clump density significantly diminishes the expected DM annihilation signal from
the galactic halo.
The text was submitted by the authors in English. 相似文献
2.
Mathematical Notes - 相似文献
3.
A. S. Balueva A. S. Dokuchaev S. R. Prokhorova A. P. Filippova G. N. Nikonov 《Russian Chemical Bulletin》1993,42(8):1381-1384
X-Ray study of the (3,5-diallylisocyanuratomethyl)bis(chloromethyl)phosphine oxide showed that the phosphorylmethyl group is bonded to the nitrogen atom of the cycle. Reaction of the tris(chloromethyl)phosphine sulfide with sodium diallylisocyanurate gave (3,5-diallylisocyanuratomethyl)bis(chloromethyl)phosphine sulfide, and treatment of the tris(3,5-diallylisocyanuratomethyl)phosphine oxide with phosphorus pentasulfide gave a tris(3,5-diallylisocyanuratomethyl)bis(chloromethyl)phosphine sulfide.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1446–1448, August, 1993. 相似文献
4.
General Relativity and Gravitation - In previous work, we established theoretical results concerning the effect of matter shells surrounding a gravitational wave (GW) source, and we now apply these... 相似文献
5.
V. S. Berezinsky V. I. Dokuchaev Yu. N. Eroshenko M. Kachelrieß M. Aa. Solberg 《Theoretical and Mathematical Physics》2012,170(1):83-89
We describe some specific but reasonable conditions for the formation of superdense clumps (or minihalos) of dark matter.
Such clumps can be produced by several mechanisms, most notably by spiky features in the spectrum of density perturbations.
Being produced very early during the radiation-dominated epoch, these clumps evolve as isolated objects. They do not belong
to hierarchical structures for a long time after production and are therefore not destroyed by tidal interactions during the
formation of larger structures. If the clumps are constituted of superheavy dark matter particles, then the evolution of their
central part can lead to a “gravithermal catastrophe,” increasing the central density and thus the annihilation signal. As
a result, annihilations of superheavy neutralinos in dense clumps may lead to observable fluxes of annihilation products in
the form of ultrahigh-energy particles. 相似文献
6.
7.
8.
E. O. Babichev V. I. Dokuchaev Yu. N. Eroshenko 《Journal of Experimental and Theoretical Physics》2005,100(3):528-538
The stationary, spherically symmetric accretion of dark energy onto a Schwarzschild black hole is considered in terms of relativistic hydrodynamics. The approximation of an ideal fluid is used to model the dark energy. General expressions are derived for the accretion rate of an ideal fluid with an arbitrary equation of state p = p(ρ) onto a black hole. The black hole mass was found to decrease for the accretion of phantom energy. The accretion process is studied in detail for two dark energy models that admit an analytical solution: a model with a linear equation of state, p = α(ρ ? ρ0), and a Chaplygin gas. For one of the special cases of a linear equation of state, an analytical expression is derived for the accretion rate of dark energy onto a moving and rotating black hole. The masses of all black holes are shown to approach zero in cosmological models with phantom energy in which the Big Rip scenario is realized. 相似文献
9.
All possible evolution scenarios of a thin vacuum shell surrounding the spherically symmetric de Sitter space have been determined and the corresponding global geometries have been constructed. Such configurations can appear at the final stage of the cosmological phase transition, when isolated regions (islands) of the old vacuum remain. The islands of the old vacuum are absorbed by the new vacuum, expand unlimitedly, or form black holes and wormholes depending on the sizes of the islands as well as on the density and velocity of the shells surrounding the islands. 相似文献
10.
A criterion for semiprime rings with finite decomposition of identity to be prime is given. We also present a brief survey
of some finiteness conditions related to the decomposition of identity. We consider the notion of a net of a ring and show
that the lattice of all two-sided ideals of a right semidistributive semiperfect ring is distributive. An application of decompositions
of identity to groups of units is given. 相似文献