全文获取类型
收费全文 | 2645篇 |
免费 | 101篇 |
国内免费 | 192篇 |
专业分类
化学 | 7篇 |
力学 | 74篇 |
综合类 | 39篇 |
数学 | 2578篇 |
物理学 | 240篇 |
出版年
2023年 | 27篇 |
2022年 | 13篇 |
2021年 | 39篇 |
2020年 | 27篇 |
2019年 | 55篇 |
2018年 | 49篇 |
2017年 | 60篇 |
2016年 | 44篇 |
2015年 | 47篇 |
2014年 | 81篇 |
2013年 | 201篇 |
2012年 | 86篇 |
2011年 | 96篇 |
2010年 | 85篇 |
2009年 | 143篇 |
2008年 | 190篇 |
2007年 | 181篇 |
2006年 | 140篇 |
2005年 | 130篇 |
2004年 | 102篇 |
2003年 | 113篇 |
2002年 | 135篇 |
2001年 | 86篇 |
2000年 | 104篇 |
1999年 | 75篇 |
1998年 | 77篇 |
1997年 | 79篇 |
1996年 | 53篇 |
1995年 | 57篇 |
1994年 | 34篇 |
1993年 | 31篇 |
1992年 | 30篇 |
1991年 | 22篇 |
1990年 | 28篇 |
1989年 | 17篇 |
1988年 | 20篇 |
1987年 | 20篇 |
1986年 | 14篇 |
1985年 | 19篇 |
1984年 | 17篇 |
1983年 | 7篇 |
1982年 | 21篇 |
1981年 | 16篇 |
1980年 | 10篇 |
1979年 | 14篇 |
1978年 | 9篇 |
1977年 | 15篇 |
1976年 | 8篇 |
1975年 | 3篇 |
1974年 | 3篇 |
排序方式: 共有2938条查询结果,搜索用时 312 毫秒
21.
In this paper, we review and unify some classes of generalized convex functions introduced by different authors to prove minimax results in infinite-dimensional spaces and show the relations between these classes. We list also for the most general class already introduced by Jeyakumar (Ref. 1) an elementary proof of a minimax result. The proof of this result uses only a finite-dimensional separa- tion theorem; although this minimax result was already presented by Neumann (Ref. 2) and independently by Jeyakumar (Ref. 1), we believe that the present proof is shorter and more transparent. 相似文献
22.
23.
Young Ja Park 《Proceedings of the American Mathematical Society》2004,132(7):2075-2083
A logarithmic Sobolev trace inequality is derived. Bounds on the best constant for this inequality from above and below are investigated using the sharp Sobolev inequality and the sharp logarithmic Sobolev inequality.
24.
We show by general considerations that it is not possible to test violation of the existing versions of Bell’s inequality
in entangled neutral kaons system using experimentally accessible thin regenerators. We point out the loophole in the recent
argument (A Bramon and M Nowakowski, Phys. Rev. Lett.
83, 1 (1999)) that claimed such a test to be possible. 相似文献
25.
We provide some inequalities and integral inequalities connected to the Jensen-Hadamard inequalities for convex functions.
In particular, we give some refinements to these inequalities. Some natural applications and further extensions are given.
Sunto Forniamo alcune diseguaglianze e diseguaglianze integrali connesse alle dise-gueglianze di Jensen-Hadamard per funzioni convesse. In particolare, diamo qualche miglioramento di queste diseguaglianze. Alcune applicazioni naturali ed ulteriori estensioni sono date.相似文献
26.
We propose general variational inclusion problems which are slightly different from corresponding problems considered in several recent papers in the literature and show that they are advantageous. Sufficient conditions for the solution existence are established. As applications we derive consequences for several special cases of variational inclusion problems, quasioptimization problems, equilibrium problems and implicit variational inequalities and show that they improve the results of some recent existing papers. 相似文献
27.
This paper deals with a model of time-dependent double diffusive convection in Darcy flow. In particular it is concerned with the spatial decay of solutions when the flow is confined to a semi-infinite cylinder. Decay bounds for an energy expression are derived. 相似文献
28.
本文研究了独立随机变量之和的绝对矩的几个性质, 其中包括$\ep|X+Y|-\ep|X-Y|$的表达式, 这里$X$和$Y$是相互独立的随机变量. 相似文献
29.
Xin Tao YE Chong LI 《数学学报(英文版)》2007,23(1):65-76
The BCQ and the Abadie CQ for infinite systems of convex inequalities in Banach spaces are characterized in terms of the upper semi-continuity of the convex cones generated by the subdifferentials of active convex functions. Some relationships with other constraint qualifications such as the CPLV and the Slate condition are also studied. Applications in best approximation theory are provided. 相似文献
30.
Sedimentation and erosion processes in sedimentary basins can be modeled by a parabolic equation with a limiter on the fluxes and a constraint on the time variation.This limiter happens to satisfy a stationary scalar hyperbolic inequality,within a constraint,for which the authors prove the existence and the uniqueness of the solution.Actually,this solution is shown to be the maximal element of a convenient convex set of functions.The existence proof is obtained thanks to the use of a numerical scheme. 相似文献