全文获取类型
收费全文 | 8141篇 |
免费 | 681篇 |
国内免费 | 1124篇 |
专业分类
化学 | 109篇 |
晶体学 | 2篇 |
力学 | 219篇 |
综合类 | 185篇 |
数学 | 8215篇 |
物理学 | 1216篇 |
出版年
2024年 | 14篇 |
2023年 | 79篇 |
2022年 | 87篇 |
2021年 | 121篇 |
2020年 | 175篇 |
2019年 | 231篇 |
2018年 | 232篇 |
2017年 | 234篇 |
2016年 | 265篇 |
2015年 | 182篇 |
2014年 | 390篇 |
2013年 | 610篇 |
2012年 | 341篇 |
2011年 | 482篇 |
2010年 | 458篇 |
2009年 | 644篇 |
2008年 | 624篇 |
2007年 | 638篇 |
2006年 | 546篇 |
2005年 | 480篇 |
2004年 | 401篇 |
2003年 | 434篇 |
2002年 | 392篇 |
2001年 | 258篇 |
2000年 | 295篇 |
1999年 | 280篇 |
1998年 | 237篇 |
1997年 | 227篇 |
1996年 | 138篇 |
1995年 | 69篇 |
1994年 | 66篇 |
1993年 | 40篇 |
1992年 | 36篇 |
1991年 | 23篇 |
1990年 | 16篇 |
1989年 | 18篇 |
1988年 | 19篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1985年 | 15篇 |
1984年 | 26篇 |
1983年 | 15篇 |
1982年 | 23篇 |
1981年 | 14篇 |
1980年 | 20篇 |
1979年 | 11篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1936年 | 4篇 |
排序方式: 共有9946条查询结果,搜索用时 9 毫秒
131.
132.
A horizontal Hodge Laplacian operator $\square_{\mathcal {H}}$ is defined for Hermitian holomorphic vector bundles over PTM on K¨ahler Finsler manifold, and the expression of $\square_{\mathcal {H}}$ is obtained explicitly in terms of horizontal covariant derivatives of the Chern-Finsler connection. The vanishing theorem is obtained by using the $\partial_{\mathcal
{H}}\ov{\partial}_{\mathcal {H}}$-method on K¨ahler Finsler manifolds. 相似文献
133.
In this paper, we study the commutativity of Toeplitz operators with radial symbols on the pluriharmonic Bergman space. We obtain the necessary and sufficient conditions for the commutativity of bounded Toeplitz operator and Toeplitz operator with radial symbol on the pluriharmonic Bergman space. 相似文献
134.
This paper is devoted to the high-dimensional and multilinear Hausdorff operators on the Heisenberg group H n. The sharp bounds for the strong type(p, p)(1 ≤ p ≤∞) estimates of n-dimensional Hausdorff operators on H n are obtained. The sharp bounds for strong(p, p) estimates are further extended to multilinear cases. As an application, we derive the sharp constant for the multilinear Hardy operator on H n. The weak type(p, p)(1 ≤ p ≤∞) estimates are also obtained. 相似文献
135.
136.
本文首先由超空间上Cauchy-Pompeiu公式定义了超空间上高阶Teodorescu算子,研究了此类算子的一些基本性质.其次,利用此类算子,我们得到了$k$-超正则函数的Almansi型展开. 最后运用这个展开,我们证明了$k$-超正则函数的Morera型定理、开拓定理和唯一性定理. 相似文献
137.
138.
For the commutators of multilinear Calder ′on-Zygmund singular integral operators with B MO functions, the weak type weighted norm inequalities with respect to A~P weights are obtained. 相似文献
139.
The Willmore flow is well known problem from the differential geometry. It minimizes the Willmore functional defined as integral of the mean-curvature square over given manifold. For the graph formulation, we derive modification of the Willmore flow with anisotropic mean curvature. We define the weak solution and we prove an energy equality. We approximate the solution numerically by the complementary finite volume method. To show the stability, we re-formulate the resulting scheme in terms of the finite difference method. By using simple framework of the finite difference method (FDM) we show discrete version of the energy equality. The time discretization is done by the method of lines and the resulting system of ODEs is solved by the Runge–Kutta–Merson solver with adaptive integration step. We also show experimental order of convergence as well as results of the numerical experiments, both for several different anisotropies. 相似文献
140.
In this work we focus on the efficient representation and computation of the eigenvalues and eigenfunctions of the surface Schrödinger operator that governs a class of nonlinear Ginzburg–Landau (GL) superconductivity models on rotationally symmetric Riemannian 2-manifolds S. We identify and analyze a complete orthonormal system in of eigenmodes having a variable-separated form. For the unknown functions in this ansatz, our analysis facilitates the identification of approximate spectral problems whose eigenvalues lie arbitrarily near corresponding eigenvalues of the Schrödinger operator. We then develop and implement an arbitrary order finite element method for the efficient numerical approximation of the eigenvalue problem. We also demonstrate our analysis, algorithm and its convergence rate using parallel computations performed on a variety of choices of smooth and non-smooth surfaces S. 相似文献