全文获取类型
收费全文 | 993篇 |
免费 | 84篇 |
国内免费 | 122篇 |
专业分类
化学 | 145篇 |
晶体学 | 5篇 |
力学 | 69篇 |
综合类 | 23篇 |
数学 | 746篇 |
物理学 | 211篇 |
出版年
2023年 | 9篇 |
2022年 | 23篇 |
2021年 | 24篇 |
2020年 | 24篇 |
2019年 | 30篇 |
2018年 | 30篇 |
2017年 | 35篇 |
2016年 | 26篇 |
2015年 | 26篇 |
2014年 | 41篇 |
2013年 | 85篇 |
2012年 | 35篇 |
2011年 | 50篇 |
2010年 | 45篇 |
2009年 | 55篇 |
2008年 | 53篇 |
2007年 | 50篇 |
2006年 | 45篇 |
2005年 | 50篇 |
2004年 | 47篇 |
2003年 | 63篇 |
2002年 | 40篇 |
2001年 | 37篇 |
2000年 | 24篇 |
1999年 | 29篇 |
1998年 | 33篇 |
1997年 | 25篇 |
1996年 | 18篇 |
1995年 | 15篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 7篇 |
1973年 | 2篇 |
1962年 | 1篇 |
排序方式: 共有1199条查询结果,搜索用时 15 毫秒
61.
62.
Central limit theorem and almost sure central limit theorem for the product of some partial sums 总被引:1,自引:0,他引:1
Miao Yu 《Proceedings Mathematical Sciences》2008,118(2):289-294
In this paper, we give the central limit theorem and almost sure central limit theorem for products of some partial sums of
independent identically distributed random variables. 相似文献
63.
该文证明了随机元序列的一个一般的几乎处处中心极限定理, 并把这一结论应用于随机变量序列的函数. 相似文献
64.
We study systematically the natural generalization of Schreier’s extension theory to obtain proper loops and show that this construction gives a rich family of examples of loops in all traditional common, important loop classes. 相似文献
65.
M. S. Ginovyan A. A. Sahakyan 《Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences)》2008,43(4):195-205
The paper establishes error orders for integral limit approximations to the traces of products of truncated Toeplitz operators
generated by integrable real symmetric functions defined on the real line. These approximations and the corresponding error
bounds are of importance in the statistical analysis of continuous-time stationary processes (asymptotic distributions and
large deviations of Toeplitz type quadratic functionals, estimation of the spectrum, etc.). The results improve the rates
obtained by the authors (in an earlier paper).
An explicit second-order asymptotic expansion is found for the trace of a product of two truncated Toeplitz operators generated
by the spectral densities of continuous-time stationary fractional Riesz-Bessel motions. The order of magnitude of the second
term in this expansion is shown to depend on the long-memory parameters of the processes. The second-order term provides a
substantially better approximation to the original functional, as compared with the first-order approximation.
M. Ginovyan research was partially supported by National Science Foundation Grant #DMS-0706786. 相似文献
66.
O. Yu. Dashkova 《Siberian Mathematical Journal》2008,49(6):1023-1033
Under study are the solvable nonabelian linear groups of infinite central dimension and sectional p-rank, p ≥ 0, in which all proper nonabelian subgroups of infinite sectional p-rank have finite central dimension. We describe the structure of the groups of this class. 相似文献
67.
Naihong Hu Yufeng Pei Dong Liu 《Proceedings of the American Mathematical Society》2008,136(2):437-447
Mainly motivated by Pirashvili's spectral sequences on a Leibniz algebra, a cohomological characterization of Leibniz central extensions of Lie algebras is given. In particular, as applications, we obtain the cohomological version of Gao's main theorem for Kac-Moody algebras and answer a question in an earlier paper by Liu and Hu (2004).
68.
Guo Dong LIU Wen Peng ZHANG 《数学学报(英文版)》2008,24(2):343-352
The authors establish an explicit formula for the generalized Euler NumbersE2n^(x), and obtain some identities and congruences involving the higher'order Euler numbers, Stirling numbers, the central factorial numbers and the values of the Riemann zeta-function. 相似文献
69.
Aleš Drápal 《Czechoslovak Mathematical Journal》2005,55(1):61-86
If Q is a quasigroup that is free in the class of all quasigroups which are isotopic to an Abelian group, then its multiplication group Mlt Q is a Frobenius group. Conversely, if Mlt Q is a Frobenius group, Q a quasigroup, then Q has to be isotopic to an Abelian group. If Q is, in addition, finite, then it must be a central quasigroup (a T-quasigroup).This work was supported by institutional grant MSM 113200007, and by Grant Agency of Czech Republic, grant number 201/99/0263. 相似文献
70.
We establish the asymptotic normality of the squared L
2-norm of the approximation error of a linear wavelet estimator of the density of a distribution. The calculations are based on the smallness of correlations between the coefficients of the high-frequency part of the multiresolution expansion of the estimator.Supported by the FCT Foundation (Portugal) in the framework of the project Probability and Statistics (2000–2002), Centro de Matematica, Universidade da Beira Interior.__________Translated from Lietuvos Matematikos Rinkinys, Vol. 45, No. 2, pp. 184–207, April–June, 2005. 相似文献