全文获取类型
收费全文 | 7889篇 |
免费 | 511篇 |
国内免费 | 735篇 |
专业分类
化学 | 150篇 |
力学 | 349篇 |
综合类 | 113篇 |
数学 | 7645篇 |
物理学 | 878篇 |
出版年
2024年 | 11篇 |
2023年 | 91篇 |
2022年 | 105篇 |
2021年 | 106篇 |
2020年 | 181篇 |
2019年 | 195篇 |
2018年 | 170篇 |
2017年 | 213篇 |
2016年 | 196篇 |
2015年 | 178篇 |
2014年 | 355篇 |
2013年 | 621篇 |
2012年 | 291篇 |
2011年 | 411篇 |
2010年 | 371篇 |
2009年 | 467篇 |
2008年 | 564篇 |
2007年 | 572篇 |
2006年 | 489篇 |
2005年 | 478篇 |
2004年 | 359篇 |
2003年 | 379篇 |
2002年 | 295篇 |
2001年 | 268篇 |
2000年 | 235篇 |
1999年 | 229篇 |
1998年 | 217篇 |
1997年 | 208篇 |
1996年 | 139篇 |
1995年 | 89篇 |
1994年 | 72篇 |
1993年 | 61篇 |
1992年 | 54篇 |
1991年 | 56篇 |
1990年 | 32篇 |
1989年 | 30篇 |
1988年 | 33篇 |
1987年 | 19篇 |
1986年 | 26篇 |
1985年 | 41篇 |
1984年 | 30篇 |
1983年 | 20篇 |
1982年 | 25篇 |
1981年 | 31篇 |
1980年 | 19篇 |
1979年 | 26篇 |
1978年 | 24篇 |
1977年 | 17篇 |
1976年 | 16篇 |
1973年 | 6篇 |
排序方式: 共有9135条查询结果,搜索用时 0 毫秒
31.
The authors establish the Hilbertian invariance principle for the empirical process of a stationary Markov process, by extending the forward-backward martingale decomposition of Lyons-Meyer-Zheng to the Hilbert space valued additive functionals associated with general non-reversible Markov processes. 相似文献
32.
Johan van Benthem 《Logica Universalis》2007,1(1):125-138
We prove new Lindstr?m theorems for the basic modal propositional language, and for some related fragments of first-order
logic. We find difficulties with such results for modal languages without a finite-depth property, high-lighting the difference
between abstract model theory for fragments and for extensions of first-order logic. In addition we discuss new connections
with interpolation properties, and the modal invariance theorem.
Mathematics Subject Classification (2000): Primary 03B45; Secondary 03C95 相似文献
33.
本文讨论了在区域提纯过程中,研究液态金属流的表面张力时提出的一个带有非负参数Q的两点边值问题.利用上、下解方法和Schauder不动点定理,证明了当0Q851时,该问题至少有一个解,对已有结果0Q<1进行了重要的改进. 相似文献
34.
Pedro J. Torres 《Journal of Differential Equations》2007,232(1):277-284
In a periodically forced semilinear differential equation with a singular nonlinearity, a weak force condition enables the achievement of new existence criteria through a basic application of Schauder's fixed point theorem. The originality of the arguments relies in that, contrary to the customary situation in the available references, a weak singularity facilitates the arguments of the proofs. 相似文献
35.
The complete proofs of Krein’s theorem on the spectral shift function and the trace formula are given for a pair of self-adjoint
operators such that either (i) their difference is trace-class or (ii) the difference of their resolvents is trace-class.
The proofs, essentially due to Krein, is based on Herglotz’s theorem on the boundary value of the analytic functions whose
imaginary part is non-negative on the upper half plane, and an almost optimal class of functions are obtained for which the
trace formula is valid. Also an alternative method based on Weyl-von Neumann’s theorem for self-adjoint operators, avoiding
the complex function theory and inspired by Voiculescu’s work, is given for the first case. Furthermore, some applications
of the spectral shift function have been discussed. 相似文献
36.
Sergio Albeverio Yeneng Sun Jiang-Lun Wu 《Transactions of the American Mathematical Society》2007,359(2):517-527
It is shown that for a large collection of independent martingales, the martingale property is preserved on the empirical processes. Under the assumptions of independence and identical finite-dimensional distributions, it is proved that a large collection of stochastic processes are martingales essentially if and only if the empirical processes are also martingales. These two results have implications on the testability of the martingale property in scientific modeling. Extensions to submartingales and supermartingales are given.
37.
讨论关于在ILC用γγ到Z过程检验非对易时空能标(原文发在hep-ph/0604115). 在通常时空量子场论中, 由杨氏定理可知一个自旋为1的粒子不可能衰变为两个光子. 但在非对易时空中此过程是允许的. 因此这个过程能作为检验非对易时空的工具. ILC的光子对撞模式能实现这个过程. 如果总亮度能达到500fb-1, 我们证明对Gamma (Z to gamma gamma)宽度的测量精度将比现有限制(<5.2×10-5GeV)好3—4个数量级. 对非对易时空能标的检测可高达几个TeV. 相似文献
38.
Arup Bose 《Journal of Theoretical Probability》1998,11(4):921-933
We prove a weighted Glivenko-Cantelli theorem and apply it to study the rate of convergence in the strong law for L-statistics. 相似文献
39.
A. M. Stokolos 《Mathematical Notes》1998,64(5):646-657
It is proved that there exists an integrable function on [0, 1]2 whose integral is nondifferentiable in each direction belonging to a set everywhere dense in [0, 2π] but is strongly differentiable.
Translated fromMatematicheskie Zametki, Vol. 64, No. 5, pp. 749–762, November, 1998. 相似文献
40.
A. M. Popov 《Mathematical Notes》1998,64(3):377-381
For operators corresponding to systems ofμth-order difference-differential equations of neutral type, necessary and sufficient conditions for potentiality with respect
to the classical bilinear form are obtained. These results are applied to first-order quasilinear systems.
Translated fromMatematicheskie Zametki, Vol. 64, No. 3, pp. 437–442, September, 1998.
The author wishes to express his thanks to V. M. Savchin for fruitful discussions and useful remarks. 相似文献