全文获取类型
收费全文 | 6174篇 |
免费 | 431篇 |
国内免费 | 490篇 |
专业分类
化学 | 114篇 |
力学 | 268篇 |
综合类 | 155篇 |
数学 | 6366篇 |
物理学 | 192篇 |
出版年
2024年 | 5篇 |
2023年 | 56篇 |
2022年 | 57篇 |
2021年 | 94篇 |
2020年 | 135篇 |
2019年 | 154篇 |
2018年 | 149篇 |
2017年 | 172篇 |
2016年 | 175篇 |
2015年 | 112篇 |
2014年 | 244篇 |
2013年 | 481篇 |
2012年 | 281篇 |
2011年 | 320篇 |
2010年 | 263篇 |
2009年 | 381篇 |
2008年 | 346篇 |
2007年 | 384篇 |
2006年 | 327篇 |
2005年 | 289篇 |
2004年 | 248篇 |
2003年 | 234篇 |
2002年 | 258篇 |
2001年 | 251篇 |
2000年 | 245篇 |
1999年 | 207篇 |
1998年 | 191篇 |
1997年 | 182篇 |
1996年 | 135篇 |
1995年 | 107篇 |
1994年 | 88篇 |
1993年 | 69篇 |
1992年 | 49篇 |
1991年 | 48篇 |
1990年 | 51篇 |
1989年 | 26篇 |
1988年 | 20篇 |
1987年 | 24篇 |
1986年 | 23篇 |
1985年 | 29篇 |
1984年 | 27篇 |
1983年 | 15篇 |
1982年 | 30篇 |
1981年 | 20篇 |
1980年 | 16篇 |
1979年 | 18篇 |
1978年 | 20篇 |
1977年 | 14篇 |
1976年 | 11篇 |
1974年 | 3篇 |
排序方式: 共有7095条查询结果,搜索用时 31 毫秒
81.
The convergent iterative procedure for solving the groundstate Schr?dinger
equation is extended to derive the excitation energy and the wavefunction of the
low-lying excited states. The method is applied to the one-dimensional quartic
potential problem. The results show that the iterative solution converges rapidly
when the coupling g is not too small. 相似文献
82.
Pankaj Mathur 《分析论及其应用》2006,22(2):105-113
In this paper, we study the explicit representation and convergence of (0, 1;0)-interpolation on infisite interval, which means to determine a polynomial of degree ≤ 3n - 2 when the function values areprescribed at two set of points namely the zeros of Hn(x) and H′n (x) and the first derivatives at the zerosof H′n(x). 相似文献
83.
84.
Zhangxin Chen 《Numerical Methods for Partial Differential Equations》2002,18(2):203-217
In this article we prove uniform convergence estimates for the recently developed Galerkin‐multigrid methods for nonconforming finite elements for second‐order problems with less than full elliptic regularity. These multigrid methods are defined in terms of the “Galerkin approach,” where quadratic forms over coarse grids are constructed using the quadratic form on the finest grid and iterated coarse‐to‐fine intergrid transfer operators. Previously, uniform estimates were obtained for problems with full elliptic regularity, whereas these estimates are derived with less than full elliptic regularity here. Applications to the nonconforming P1, rotated Q1, and Wilson finite elements are analyzed. The result applies to the mixed method based on finite elements that are equivalent to these nonconforming elements. © 2002 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 18: 203–217, 2002; DOI 10.1002/num.10004 相似文献
85.
Bin Han 《Advances in Computational Mathematics》2006,24(1-4):375-403
In this paper, we present a necessary and sufficient condition for the existence of solutions in a Sobolev space Wpk(ℝs) (1≤p≤∞) to a vector refinement equation with a general dilation matrix. The criterion is constructive and can be implemented.
Rate of convergence of vector cascade algorithms in a Sobolev space Wpk(ℝs) will be investigated. When the dilation matrix is isotropic, a characterization will be given for the Lp (1≤p≤∞) critical smoothness exponent of a refinable function vector without the assumption of stability on the refinable function
vector. As a consequence, we show that if a compactly supported function vector φ∈Lp(ℝs) (φ∈C(ℝs) when p=∞) satisfies a refinement equation with a finitely supported matrix mask, then all the components of φ must belong to a Lipschitz
space Lip(ν,Lp(ℝs)) for some ν>0. This paper generalizes the results in R.Q. Jia, K.S. Lau and D.X. Zhou (J. Fourier Anal. Appl. 7 (2001) 143–167)
in the univariate setting to the multivariate setting.
Dedicated to Professor Charles A. Micchelli on the occasion of his 60th birthday
Mathematics subject classifications (2000) 42C20, 41A25, 39B12.
Research was supported in part by the Natural Sciences and Engineering Research Council of Canada (NSERC Canada) under Grant
G121210654. 相似文献
86.
给出了大规模界约束优化的一个子空间截断牛顿法。利用截断牛顿法修正非有效约束所对应的变量,用投影梯度法修正有效约束所对应的变量,文中证明了方法的整体收敛性,并对方法进行了数值试验,且与子空间有限内存拟牛顿法进行了数值比较。 相似文献
87.
88.
89.
关于B值随机和的完全收敛性的进一步讨论 总被引:1,自引:0,他引:1
该文在深入揭示B值非随机和完全收敛性中的一系列等价关系的基础上,给出了随机和完全收敛的充分条件,改进和完善了有关文献中的既有成果,并对矩条件的必要性问题做了初步讨论. 相似文献
90.
Pablo Pedregal 《Transactions of the American Mathematical Society》2006,358(2):591-602
We introduce multi-scale Young measures to deal with problems where multi-scale phenomena are relevant. We prove some interesting representation results that allow the use of these families of measures in practice, and illustrate its applicability by treating, from this perspective, multi-scale convergence and homogenization of multiple integrals.