全文获取类型
收费全文 | 5066篇 |
免费 | 307篇 |
国内免费 | 475篇 |
专业分类
化学 | 61篇 |
晶体学 | 3篇 |
力学 | 571篇 |
综合类 | 32篇 |
数学 | 4137篇 |
物理学 | 1044篇 |
出版年
2024年 | 11篇 |
2023年 | 57篇 |
2022年 | 62篇 |
2021年 | 75篇 |
2020年 | 132篇 |
2019年 | 143篇 |
2018年 | 164篇 |
2017年 | 156篇 |
2016年 | 118篇 |
2015年 | 108篇 |
2014年 | 191篇 |
2013年 | 853篇 |
2012年 | 145篇 |
2011年 | 217篇 |
2010年 | 202篇 |
2009年 | 291篇 |
2008年 | 375篇 |
2007年 | 321篇 |
2006年 | 284篇 |
2005年 | 256篇 |
2004年 | 249篇 |
2003年 | 237篇 |
2002年 | 221篇 |
2001年 | 147篇 |
2000年 | 183篇 |
1999年 | 144篇 |
1998年 | 157篇 |
1997年 | 112篇 |
1996年 | 49篇 |
1995年 | 34篇 |
1994年 | 25篇 |
1993年 | 30篇 |
1992年 | 19篇 |
1991年 | 8篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1985年 | 12篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1974年 | 2篇 |
1959年 | 1篇 |
1957年 | 1篇 |
1936年 | 2篇 |
排序方式: 共有5848条查询结果,搜索用时 15 毫秒
1.
2.
We study the relation between the cohomology of general linear and symmetric groups and their respective quantizations, using Schur algebras and standard homological techniques to build appropriate spectral sequences. As our methods fit inside a much more general context within the theory of finite-dimensional algebras, we develop our results first in that general setting, and then specialize to the above situations. From this we obtain new proofs of several known results in modular representation theory of symmetric groups. Moreover, we reduce certain questions about computing extensions for symmetric groups and Hecke algebras to questions about extensions for general linear groups and their quantizations. 相似文献
3.
Anti-BZ-Structure in Effect Algebras 总被引:1,自引:0,他引:1
The definitions of sharply approximating effect algebras, anti-BZ-effect algebras, central approximating effect algebras, and S-anti-BZ-effect algebras are given, the relationships between sharply approximating effect algebras and anti-BZ-effect algebras, between central approximating effect algebras and anti-BZ-effect algebras are established, and the set of anti-BZ-sharp elements in S-anti-BZ-effect algebras is proved to be an orthomodular lattice. 相似文献
4.
研究非Chetaev型变质量非完整系统的Lie对称性与Noether对称性以及其间的 关系,给出Lie对称性导致Noether对称性以及Noether对称性导致Lie对称性的条件. 相似文献
5.
We construct the polynomial quantization on the space G/H where G=SL(n,R),H=GL(n–1,R). It is a variant of quantization in the spirit of Berezin. In our case covariant and contravariant symbols are polynomials on G/H. We introduce a multiplication of covariant symbols, establish the correspondence principle, study transformations of symbols (the Berezin transform) and of operators. We write a full asymptotic decomposition of the Berezin transform. 相似文献
6.
Oksana Yakimova 《Acta Appl Math》2004,81(1):339-345
In this paper, we give a partial classification of commutative spaces of Heisenberg type. Several classification results were known previously. In order to avoid complicated technical details, we restrict ourselves to saturated commutative spaces. Our results are presented in Table II. 相似文献
7.
Claudia Garetto 《Acta Appl Math》2004,80(2):123-174
The aim of this work is to develop a global calculus for pseudo-differential operators acting on suitable algebras of generalized functions. In particular, a condition of global hypoellipticity of the symbols gives a result of regularity for the corresponding pseudo-differential equations. This calculus and this frame are proposed as tools for the study in Colombeau algebras of partial differential equations globally defined on R
n
. 相似文献
8.
D. P. Zhelobenko 《Acta Appl Math》2004,81(1):347-354
A special class of associative algebras is introduced and studied. A criteria of semisimplicity for suitable category of modules is obtained. 相似文献
9.
在这篇文章中,我们讨论了李双代数胚之间的态射,得到了一些李双代数胚之间态射的性质.研究了泊松群胚在泊松流形上的泊松作用,以及这个泊松作用与被作用流形的切李双代数胚到作用泊松群胚的切李双代数胚之间的态射的关系,得到了一些有用的结论。 相似文献
10.
Foda Omar Leclerc Bernard Okado Masato Thibon Jean-Yves Welsh Trevor A. 《Letters in Mathematical Physics》1998,43(1):31-42
A special family of partitions occurs in two apparently unrelated contexts: the evaluation of one-dimensional configuration sums of certain RSOS models, and the modular representation theory of symmetric groups or their Hecke algebras Hm. We provide an explanation of this coincidence by showing how the irreducible Hm-modules which remain irreducible under restriction to Hm_1 (Jantzen–Seitz modules) can be determined from the decomposition of a tensor product of representations sln. 相似文献