全文获取类型
收费全文 | 2009篇 |
免费 | 175篇 |
国内免费 | 177篇 |
专业分类
化学 | 38篇 |
力学 | 169篇 |
综合类 | 25篇 |
数学 | 1963篇 |
物理学 | 166篇 |
出版年
2024年 | 4篇 |
2023年 | 26篇 |
2022年 | 20篇 |
2021年 | 41篇 |
2020年 | 71篇 |
2019年 | 74篇 |
2018年 | 67篇 |
2017年 | 76篇 |
2016年 | 70篇 |
2015年 | 61篇 |
2014年 | 102篇 |
2013年 | 185篇 |
2012年 | 105篇 |
2011年 | 82篇 |
2010年 | 84篇 |
2009年 | 115篇 |
2008年 | 141篇 |
2007年 | 132篇 |
2006年 | 100篇 |
2005年 | 101篇 |
2004年 | 72篇 |
2003年 | 80篇 |
2002年 | 75篇 |
2001年 | 51篇 |
2000年 | 56篇 |
1999年 | 61篇 |
1998年 | 42篇 |
1997年 | 54篇 |
1996年 | 25篇 |
1995年 | 27篇 |
1994年 | 23篇 |
1993年 | 18篇 |
1992年 | 9篇 |
1991年 | 11篇 |
1990年 | 12篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 17篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1957年 | 1篇 |
排序方式: 共有2361条查询结果,搜索用时 140 毫秒
81.
In this paper we prove the smoothness of solutions of a class of elliptic-parabolic nonlinear Levi type equations, represented as a sum of squares plus a vector field. By means of a freezing method the study of the operator is reduced to the analysis of a family of left invariant operators on a free nilpotent Lie group. The fundamental solution of the operator is used as a parametrix of the fundamental solution of the Levi operator, and provides an explicit representation formula for the solution of the given equation. Differentiating this formula and applying a bootstrap method, we prove that the solution is .
82.
Bernard Coupet Hervé Gaussier Alexandre Sukhov 《Proceedings of the American Mathematical Society》1999,127(11):3191-3200
We study rigidity and regularity properties of CR maps between smooth convex hypersurfaces of finite type in
83.
The aim of the paper is to develop the Fourier Analysis techniques needed in the study of optimal well-posedness and global regularity properties of the Yang-Mills equations in Minkowski space-time , for the case of the critical dimension . We introduce new functional spaces and prove new bilinear estimates for solutions of the homogeneous wave equation, which can be viewed as generalizations of the well-known Strichartz-Pecher inequalities.
84.
基于LAGRANGE插值的高阶微分中值定理 总被引:2,自引:0,他引:2
陈之兵 《应用数学与计算数学学报》2002,16(1):35-39
本文基于LAGRANGE插值,将微积分中非常重要的中值定理推广到了高阶的情形。 相似文献
85.
S. T. Glad 《Journal of Optimization Theory and Applications》1979,28(2):135-156
The convergence properties of different updating methods for the multipliers in augmented Lagrangians are considered. It is assumed that the updating of the multipliers takes place after each line search of a quasi-Newton method. Two of the updating methods are shown to be linearly convergent locally, while a third method has superlinear convergence locally. Modifications of the algorithms to ensure global convergence are considered. The results of a computational comparison with other methods are presented.This work was supported by the Swedish Institute of Applied Mathematics. 相似文献
86.
Wilhelm Hummeltenberg 《European Journal of Operational Research》1985,21(3):318-329
Capital budgeting problems with different interest rates for borrowing and lending and with possible limits on borrowing are applied to dual and primal decomposition. While the former fails if a dual gap exists, the latter becomes attractive. The paper elaborates dual and primal decomposition to capital budgeting models and discusses variants of the Benders scheme. A computer implementation is described and results of extensive computer runs with different strategies are reported which give proof of the efficiency of the implemented decomposition procedure. 相似文献
87.
In this paper we analyze the abstract parabolic evolutionary equations
88.
89.
Boundedness in Morrey spaces is studied for singular integral operators with kernels of mixed homogeneity and their commutators with multiplication by a BMO-function. The results are applied in obtaining fine (Morrey and Hölder) regularity of strong solutions to higher-order elliptic and parabolic equations with VMO coefficients. 相似文献
90.
G. Criscuolo. 《Mathematics of Computation》2004,73(245):243-250
Recently, Mastroianni and Monegato derived error estimates for a numerical approach to evaluate the integral
where or or and is a smooth function (see G. Mastroianni and G. Monegato, Error estimates in the numerical evaluation of some BEM singular integrals, Math. Comp. 70 2001, 251-267). The error bounds for the quadrature rule approximating the inner integral given in Theorems 3, 4 of that paper are not correct according to the proof. However, following a different approach, we are able to improve the pointwise error estimates given in that paper.
where or or and is a smooth function (see G. Mastroianni and G. Monegato, Error estimates in the numerical evaluation of some BEM singular integrals, Math. Comp. 70 2001, 251-267). The error bounds for the quadrature rule approximating the inner integral given in Theorems 3, 4 of that paper are not correct according to the proof. However, following a different approach, we are able to improve the pointwise error estimates given in that paper.