全文获取类型
收费全文 | 3586篇 |
免费 | 120篇 |
国内免费 | 2篇 |
专业分类
化学 | 2370篇 |
晶体学 | 39篇 |
力学 | 71篇 |
数学 | 259篇 |
物理学 | 969篇 |
出版年
2023年 | 37篇 |
2022年 | 62篇 |
2021年 | 61篇 |
2020年 | 88篇 |
2019年 | 103篇 |
2018年 | 68篇 |
2017年 | 58篇 |
2016年 | 127篇 |
2015年 | 72篇 |
2014年 | 122篇 |
2013年 | 234篇 |
2012年 | 233篇 |
2011年 | 288篇 |
2010年 | 175篇 |
2009年 | 146篇 |
2008年 | 214篇 |
2007年 | 185篇 |
2006年 | 162篇 |
2005年 | 139篇 |
2004年 | 112篇 |
2003年 | 75篇 |
2002年 | 75篇 |
2001年 | 60篇 |
2000年 | 57篇 |
1999年 | 46篇 |
1998年 | 29篇 |
1997年 | 23篇 |
1996年 | 38篇 |
1995年 | 29篇 |
1994年 | 35篇 |
1993年 | 43篇 |
1992年 | 29篇 |
1991年 | 27篇 |
1989年 | 19篇 |
1988年 | 21篇 |
1987年 | 27篇 |
1986年 | 21篇 |
1985年 | 19篇 |
1984年 | 31篇 |
1983年 | 20篇 |
1982年 | 22篇 |
1981年 | 30篇 |
1980年 | 19篇 |
1979年 | 27篇 |
1978年 | 16篇 |
1977年 | 18篇 |
1976年 | 16篇 |
1975年 | 15篇 |
1973年 | 11篇 |
1957年 | 13篇 |
排序方式: 共有3708条查询结果,搜索用时 15 毫秒
1.
2.
3.
It is explicitly shown that if phase transition occurs at the core of a newborn neutron star with moderately strong magnetic
field strength, which populates only the electron’s Landau levels, then in the β -equilibrium condition, the quark core is
energetically much more unstable than the neutron matter of identical physical condition. 相似文献
4.
An exact formalism for the relativistic version of Landau theory of Fermi liquid in presence of strong quantizing magnetic field is developed. Both direct and exchange type interactions with scalar and vector coupling cases are considered. 相似文献
5.
B. Ghosh 《等离子体物理论文集》1989,29(2):125-134
To describe the long time asymptotic behaviour of weakly nonlinear plasma waves propagating in a strongly magnetized plasmafilled cylindrical waveguide the usual KDV equation which is first order in wave amplitude is extended to second order including the effects of finite temperature, mobile ions and giving a proper treatment to the radial co-ordinate for all possible modes of propagation. The second-order effects on the first-order solitary wave profile, phase speed and first order correction to the wavelength are all determined and discussed. 相似文献
6.
7.
E. Kajari R. Walser W. P. Schleich A. Delgado 《General Relativity and Gravitation》2004,36(10):2289-2316
We present exact expressions for the Sagnac effect of Gödel's Universe. For this purpose we first derive a formula for the Sagnac time delay along a circular path in the presence of an arbitrary stationary metric in cylindrical coordinates. We then apply this result to Gödel's metric for two different experimental situations: First, the light source and the detector are at rest relative to the matter generating the gravitational field. In this case we find an expression that is formally equivalent to the familiar nonrelativistic Sagnac time delay. Second, the light source and the detector are rotating relative to the matter. Here we show that for a special rotation rate of the detector the Sagnac time delay vanishes. Finally we propose a formulation of the Sagnac time delay in terms of invariant physical quantities. We show that this result is very close to the analogous formula of the Sagnac time delay of a rotating coordinate system in Minkowski spacetime. 相似文献
8.
The study of the angular distribution of slow particles during high energy hadron-nucleus interaction indicates that emission of slow particles takes place from a thermally non-equilibrated system. This evidence has come out from the presence of intermittency - a phenomenon that reveals a fractal structure and represents a self-similarity in the particle production process. Hence, this study highlights inadequacy of cascade-evaporation model and advocates the need of its refinement. 相似文献
9.
So-Yon Lim Matt Meyer Richard A Kjonaas Swapan K Ghosh 《Journal of immune based therapies and vaccines》2007,5(1):3-1
This is a correction article. 相似文献
10.