全文获取类型
收费全文 | 17476篇 |
免费 | 1167篇 |
国内免费 | 1809篇 |
专业分类
化学 | 7215篇 |
晶体学 | 77篇 |
力学 | 700篇 |
综合类 | 302篇 |
数学 | 9899篇 |
物理学 | 2259篇 |
出版年
2024年 | 21篇 |
2023年 | 162篇 |
2022年 | 249篇 |
2021年 | 328篇 |
2020年 | 344篇 |
2019年 | 407篇 |
2018年 | 366篇 |
2017年 | 446篇 |
2016年 | 447篇 |
2015年 | 356篇 |
2014年 | 644篇 |
2013年 | 1270篇 |
2012年 | 659篇 |
2011年 | 843篇 |
2010年 | 755篇 |
2009年 | 1007篇 |
2008年 | 1098篇 |
2007年 | 1182篇 |
2006年 | 952篇 |
2005年 | 916篇 |
2004年 | 746篇 |
2003年 | 804篇 |
2002年 | 2218篇 |
2001年 | 594篇 |
2000年 | 574篇 |
1999年 | 497篇 |
1998年 | 449篇 |
1997年 | 390篇 |
1996年 | 302篇 |
1995年 | 223篇 |
1994年 | 198篇 |
1993年 | 150篇 |
1992年 | 126篇 |
1991年 | 94篇 |
1990年 | 69篇 |
1989年 | 48篇 |
1988年 | 64篇 |
1987年 | 43篇 |
1986年 | 31篇 |
1985年 | 57篇 |
1984年 | 57篇 |
1983年 | 19篇 |
1982年 | 43篇 |
1981年 | 24篇 |
1980年 | 32篇 |
1979年 | 24篇 |
1978年 | 20篇 |
1977年 | 14篇 |
1971年 | 33篇 |
1970年 | 16篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
R. Norvaisa 《Lithuanian Mathematical Journal》2005,45(4):447-457
We give a characterization of Gaussian chaos laws on Banach function spaces which do not contain ℓ
∞
n
's uniformly. The result is applied to describe the convergence in law of U-processes with sample paths in certain Banach function spaces.
__________
Published in Lietuvos Matematikos Rinkinys, Vol. 45, No. 4, pp. 553–566, October–December, 2005. 相似文献
62.
QiangWU DaChunYANG 《数学学报(英文版)》2005,21(1):81-94
In this paper, two classes of closely related multilinear singular and fractional integrals,which include the commutators as special cases, are studied and their boundedness on Herz type spaces is discussed. In fact, it is proved that these operators are actually not bounded in certain extreme cases. 相似文献
63.
Ambar Sengupta 《Journal of Geometry and Physics》1998,28(3-4):209-254
All the connected components of the moduli space of flat connections on SU (2) and SO (3) (trivial and non-trivial) bundles over closed oriented surfaces are determined. The symplectic structure and volumes of the non-maximal strata of the moduli space are also determined. 相似文献
64.
A Fixed Point Theorem for Multi-valued Composite Increasing OperatorsLiFengyou(李凤友)(DepartmentofMathematics,Tianjin'NormalUni... 相似文献
65.
66.
集值Lebesgue—Stieltjes积分 总被引:8,自引:2,他引:6
本文首先刻划了B(R_ )上的集值测度,其次建立了(R_ B(R_ ))上的集值Lebesgue-Stieltjes积分.最后,进—步建立了集值随机Lebesgue-Stietjes积分的理论. 相似文献
67.
Gunther Jäger 《Fuzzy Sets and Systems》1997,90(3):737-348
Lowen and Lowen [Applications of category theory to fuzzy subsets (Kluwer, 1992) p. 153] and Lowen et al. [Fuzzy Sets and Systems 40 (1991) 347] recently introduced the category FCS of fuzzy convergence spaces, a topological quasitopos which is a supercategory of FTS, the category of fuzzy topological spaces. In this paper, compactness in FCS is examined. Doing so we found that to define compactness as an absolute property we had to generalize the definition of fuzzy convergence space to fuzzy subsets. All basic theorems are proved including the Tychonoff product theorem. Based on the theory developed here, in a following publication, a Richardson compactification for fuzzy convergence spaces will be given. 相似文献
68.
69.
A Modified SQP Method and Its Global Convergence 总被引:6,自引:0,他引:6
Guanglu Zhou 《Journal of Global Optimization》1997,11(2):193-205
The sequential quadratic programming method developed by Wilson, Han andPowell may fail if the quadratic programming subproblems become infeasibleor if the associated sequence of search directions is unbounded. In [1], Hanand Burke give a modification to this method wherein the QP subproblem isaltered in a way which guarantees that the associated constraint region isnonempty and for which a robust convergence theory is established. In thispaper, we give a modification to the QP subproblem and provide a modifiedSQP method. Under some conditions, we prove that the algorithm eitherterminates at a Kuhn–Tucker point within finite steps or generates aninfinite sequence whose every cluster is a Kuhn–Tucker point.Finally, we give some numerical examples. 相似文献
70.
A complete study of the spectrum of a finite-dimensional Bose operator is carried out in the paper. The cases in which the
spectrum is discrete or continuous are studied.
Translated fromMatematicheskie Zametki, Vol. 61, No. 6, pp. 835–854, June, 1997.
Translated by A. M. Chebotarev 相似文献