全文获取类型
收费全文 | 340804篇 |
免费 | 2533篇 |
国内免费 | 367篇 |
专业分类
化学 | 162883篇 |
晶体学 | 4876篇 |
力学 | 17558篇 |
综合类 | 4篇 |
数学 | 50569篇 |
物理学 | 107814篇 |
出版年
2021年 | 3586篇 |
2020年 | 4058篇 |
2019年 | 4804篇 |
2018年 | 7087篇 |
2017年 | 7230篇 |
2016年 | 9475篇 |
2015年 | 4820篇 |
2014年 | 8135篇 |
2013年 | 14889篇 |
2012年 | 12748篇 |
2011年 | 14285篇 |
2010年 | 11666篇 |
2009年 | 11593篇 |
2008年 | 13572篇 |
2007年 | 13192篇 |
2006年 | 11752篇 |
2005年 | 10438篇 |
2004年 | 9931篇 |
2003年 | 9089篇 |
2002年 | 9194篇 |
2001年 | 8541篇 |
2000年 | 6919篇 |
1999年 | 5087篇 |
1998年 | 4744篇 |
1997年 | 4507篇 |
1996年 | 4283篇 |
1995年 | 3684篇 |
1994年 | 3810篇 |
1993年 | 3775篇 |
1992年 | 3805篇 |
1991年 | 4140篇 |
1990年 | 4191篇 |
1989年 | 4118篇 |
1988年 | 3865篇 |
1987年 | 3920篇 |
1986年 | 3607篇 |
1985年 | 4238篇 |
1984年 | 4450篇 |
1983年 | 3779篇 |
1982年 | 3977篇 |
1981年 | 3670篇 |
1980年 | 3373篇 |
1979年 | 3838篇 |
1978年 | 3912篇 |
1977年 | 4082篇 |
1976年 | 4147篇 |
1975年 | 3855篇 |
1974年 | 3730篇 |
1973年 | 3905篇 |
1972年 | 3301篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
A. V. Ponosov 《Journal of Mathematical Sciences》1991,56(3):2492-2496
We study properties of some linear and nonlinear operators which occur in the theory of stochastic differential and integral equations.Translated from Statisticheskie Metody Otsenivaniya i Proverki Gipotez, pp. 148–154, 1988. 相似文献
122.
A. I. Bril' V. P. Kabashnikov N. V. Kuz'mina Yu. V. Khodyko 《Journal of Applied Spectroscopy》1991,55(3):934-939
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 55, No. 3, pp. 478–484, September, 1991. 相似文献
123.
V. K. Malyutenko A. I. Liptuga V. A. Botte V. I. Chernyakhovskii 《Journal of Applied Spectroscopy》1991,55(4):1024-1028
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 55, No. 4, pp. 624–629, October, 1991. 相似文献
124.
The stressed state of a thick three-layer plate with two circular holes is studied. Resolving functions are expressed in terms of Kolosov-Muskhelishvili integral potentials and modified Bessel functions. The problem is reduced to solving an infinite set of linear algebraic equations.Translated from Teoreticheskaya i Prikladnaya Mekhanika, No. 18, pp. 25–28, 1987. 相似文献
125.
V. V. Tokarchuk 《Journal of Applied Mathematics and Mechanics》1989,53(6):708-715
The Langevin dynamics and fluctuational-dissipative relationships for the hydrodynamic fluctuations for systems which are described in the third Barnett order with respect to the gradients of the hydrodynamic variables are generalized on the basis of a kinetic approach. 相似文献
126.
Lithium (10–150 ng ml?1) in wine is determined by atomic absorption spectrometry by direct nebulization and after digestion with mixed acids. The results of methods are similar. Thirty-four wines from various Spanish provinces are analysed. 相似文献
127.
128.
129.
D. Yu. Gladilov S. Yu. Nekhaevskii A. V. Ochkin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2006,80(12):1934-1939
Various methods for describing the distribution of water in the H2O-tributyl phosphate (TBP) system were considered. An equation for describing the deviations from the Henry law was proposed. A three-parameter equation for calculating the distribution of water in H2O-TBP-solvent systems was derived. It is based on the additive solubility model and allows for the dependence of the activity coefficients on the TBP concentration. Based on the published data, the parameters of the equation for a number of systems were calculated. 相似文献
130.
A. A. Abramov S. V. Kurochkin 《Computational Mathematics and Mathematical Physics》2006,46(6):949-954
A new method for calculating the radial spheroidal functions of the first kind is proposed for the arguments that are greater than unity in modulus. A well-known representation of these functions is refined and used for this purpose. The constructs and the software implementation proposed in the paper provide an efficient tool for the calculation of the functions with a desired accuracy in a wide range of parameters. 相似文献