全文获取类型
收费全文 | 8173篇 |
免费 | 678篇 |
国内免费 | 748篇 |
专业分类
化学 | 224篇 |
晶体学 | 12篇 |
力学 | 338篇 |
综合类 | 113篇 |
数学 | 7661篇 |
物理学 | 1251篇 |
出版年
2023年 | 99篇 |
2022年 | 108篇 |
2021年 | 115篇 |
2020年 | 190篇 |
2019年 | 197篇 |
2018年 | 191篇 |
2017年 | 223篇 |
2016年 | 210篇 |
2015年 | 194篇 |
2014年 | 381篇 |
2013年 | 650篇 |
2012年 | 328篇 |
2011年 | 441篇 |
2010年 | 397篇 |
2009年 | 483篇 |
2008年 | 597篇 |
2007年 | 596篇 |
2006年 | 518篇 |
2005年 | 496篇 |
2004年 | 373篇 |
2003年 | 388篇 |
2002年 | 313篇 |
2001年 | 277篇 |
2000年 | 240篇 |
1999年 | 234篇 |
1998年 | 221篇 |
1997年 | 210篇 |
1996年 | 141篇 |
1995年 | 91篇 |
1994年 | 78篇 |
1993年 | 62篇 |
1992年 | 56篇 |
1991年 | 58篇 |
1990年 | 34篇 |
1989年 | 33篇 |
1988年 | 35篇 |
1987年 | 22篇 |
1986年 | 27篇 |
1985年 | 43篇 |
1984年 | 34篇 |
1983年 | 21篇 |
1982年 | 27篇 |
1981年 | 33篇 |
1980年 | 20篇 |
1979年 | 27篇 |
1978年 | 24篇 |
1977年 | 17篇 |
1976年 | 17篇 |
1974年 | 7篇 |
1973年 | 7篇 |
排序方式: 共有9599条查询结果,搜索用时 187 毫秒
151.
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
152.
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
153.
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
154.
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
155.
Dragan DJURCIC Aleksandar TORGASEV 《数学学报(英文版)》2006,22(3):689-692
In this paper, we prove some properties of the Seneta sequences and functions, and in particular we prove a representation theorem in the Karamata sense for the sequences from the Seneta class SOc. 相似文献
156.
In this paper we describe the general forms of all (nonlinear) continuous functionals on the sets of positive definite, positive semi-definite and Hermitian matrices which are multiplicative on the commuting elements. As a consequence, we obtain some new characterizations of the determinant on those classes of matrices.
157.
O. A. Brezhneva Yu. G. Evtushenko A. A. Tret’yakov 《Computational Mathematics and Mathematical Physics》2006,46(11):1896-1909
The theory of p-regularity is applied to optimization problems and to singular ordinary differential equations (ODE). The special variant of the method of the modified Lagrangian function proposed by Yu.G. Evtushenko for constrained optimization problems with inequality constraints is justified on the basis of the 2-factor transformation. An implicit function theorem is given for the singular case. This theorem is used to show the existence of solutions to a boundary value problem for a nonlinear differential equation in the resonance case. New numerical methods are proposed including the p-factor method for solving ODEs with a small parameter. 相似文献
158.
A. D. Yashin 《Algebra and Logic》2002,41(1):59-64
An algebra of sentences of the quite intuitionistic protothetics, that is, an intuitionistic propositional logic with quantifiers augmented by the negation of the excluded middle, is a faithful model of intuitionistic propositional logic. 相似文献
159.
该文给出了Logistic分布纪录值序列部分和的中心极限定理;对于Pareto分布纪录值序列的部分和T_n,获得了lnT_n的中心极限定理.这一工作不仅具有概率论的极限理论方面的研究价值,而且在金融、保险等领域也具有相当重要的应用前景. 相似文献
160.
Serguei Foss Takis Konstantopoulos Stan Zachary 《Journal of Theoretical Probability》2007,20(3):581-612
We consider a modulated process S which, conditional on a background process X, has independent increments. Assuming that S drifts to −∞ and that its increments (jumps) are heavy-tailed (in a sense made precise in the paper), we exhibit natural
conditions under which the asymptotics of the tail distribution of the overall maximum of S can be computed. We present results in discrete and in continuous time. In particular, in the absence of modulation, the
process S in continuous time reduces to a Lévy process with heavy-tailed Lévy measure. A central point of the paper is that we make
full use of the so-called “principle of a single big jump” in order to obtain both upper and lower bounds. Thus, the proofs
are entirely probabilistic. The paper is motivated by queueing and Lévy stochastic networks. 相似文献