全文获取类型
收费全文 | 2553篇 |
免费 | 256篇 |
国内免费 | 94篇 |
专业分类
化学 | 303篇 |
力学 | 276篇 |
综合类 | 36篇 |
数学 | 1466篇 |
物理学 | 822篇 |
出版年
2023年 | 30篇 |
2022年 | 40篇 |
2021年 | 52篇 |
2020年 | 67篇 |
2019年 | 70篇 |
2018年 | 62篇 |
2017年 | 63篇 |
2016年 | 82篇 |
2015年 | 52篇 |
2014年 | 108篇 |
2013年 | 153篇 |
2012年 | 116篇 |
2011年 | 119篇 |
2010年 | 94篇 |
2009年 | 136篇 |
2008年 | 134篇 |
2007年 | 113篇 |
2006年 | 160篇 |
2005年 | 111篇 |
2004年 | 109篇 |
2003年 | 113篇 |
2002年 | 215篇 |
2001年 | 76篇 |
2000年 | 101篇 |
1999年 | 76篇 |
1998年 | 80篇 |
1997年 | 53篇 |
1996年 | 39篇 |
1995年 | 29篇 |
1994年 | 30篇 |
1993年 | 22篇 |
1992年 | 27篇 |
1991年 | 35篇 |
1990年 | 24篇 |
1989年 | 18篇 |
1988年 | 10篇 |
1987年 | 7篇 |
1986年 | 8篇 |
1985年 | 8篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 4篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1971年 | 4篇 |
排序方式: 共有2903条查询结果,搜索用时 15 毫秒
1.
In this paper, we consider a viscoelastic wave equation of variable coefficients in the presence of past history with nonlinear damping and delay in the internal feedback and dynamic boundary conditions. Under suitable assumptions, we establish an explicit and general decay rate result without imposing restrictive assumption on the behavior of the relaxation function at infinity by Riemannian geometry method and Lyapunov functional method. 相似文献
2.
The sunset diagram of λφ4 theory is evaluated numerically in cutoff scheme and a nonzero finite term(in accordance with dimensional regularization (DR) result) is found in contrast to published calculations. This findingdramatically reduces the critical couplings for symmetry breaking in the two-loop effective potential discussed in ourprevious work. 相似文献
3.
Matt Visser Carlos Barceló Stefano Liberati 《General Relativity and Gravitation》2002,34(10):1719-1734
Condensed matter systems, such as acoustics in flowing fluids, light in moving dielectrics, or quasiparticles in a moving superfluid, can be used to mimic aspects of general relativity. More precisely these systems (and others) provide experimentally accessible models of curved-space quantum field theory. As such they mimic kinematic aspects of general relativity, though typically they do not mimic the dynamics. Although these analogue models are thereby limited in their ability to duplicate all the effects of Einstein gravity they nevertheless are extremely important—they provide black hole analogues (some of which have already been seen experimentally) and lead to tests of basic principles of curved-space quantum field theory. Currently these tests are still in the realm of gedanken-experiments, but there are plausible candidate models that should lead to laboratory experiments in the not too distant future. 相似文献
4.
Well-Posedness by Perturbations of Variational Problems 总被引:3,自引:0,他引:3
Lemaire B. Ould Ahmed Salem C. Revalski J. P. 《Journal of Optimization Theory and Applications》2002,115(2):345-368
In this paper, we consider the extension of the notion of well-posedness by perturbations, introduced by Zolezzi for optimization problems, to other related variational problems like inclusion problems and fixed-point problems. Then, we study the conditions under which there is equivalence of the well-posedness in the above sense between different problems. Relations with the so-called diagonal well-posedness are also given. Finally, an application to staircase iteration methods is presented. 相似文献
5.
6.
7.
8.
9.
姜德元 《浙江大学学报(理学版)》2003,30(5):499-502
研究了NA序列重对数律收敛速度的一般形式,把Davis和Gut的结果推广到了NA的情形,并使梁汉营等人关于对数律一个结果成为特例;作为推论,得到了关于NA序列重对数律收敛速度的充分条件. 相似文献
10.
Equilibrium Problems with Applications to Eigenvalue Problems 总被引:5,自引:0,他引:5
In this paper, we consider equilibrium problems and introduce the concept of (S)+ condition for bifunctions. Existence results for equilibrium problems with the (S)+ condition are derived. As special cases, we obtain several existence results for the generalized nonlinear variational inequality studied by Ding and Tarafdar (Ref. 1) and the generalized variational inequality studied by Cubiotti and Yao (Ref. 2). Finally, applications to a class of eigenvalue problems are given. 相似文献