全文获取类型
收费全文 | 1759篇 |
免费 | 130篇 |
国内免费 | 202篇 |
专业分类
化学 | 23篇 |
力学 | 48篇 |
综合类 | 27篇 |
数学 | 1723篇 |
物理学 | 270篇 |
出版年
2024年 | 3篇 |
2023年 | 26篇 |
2022年 | 25篇 |
2021年 | 38篇 |
2020年 | 42篇 |
2019年 | 50篇 |
2018年 | 40篇 |
2017年 | 47篇 |
2016年 | 51篇 |
2015年 | 58篇 |
2014年 | 79篇 |
2013年 | 103篇 |
2012年 | 79篇 |
2011年 | 79篇 |
2010年 | 70篇 |
2009年 | 111篇 |
2008年 | 160篇 |
2007年 | 113篇 |
2006年 | 104篇 |
2005年 | 99篇 |
2004年 | 65篇 |
2003年 | 87篇 |
2002年 | 81篇 |
2001年 | 50篇 |
2000年 | 71篇 |
1999年 | 53篇 |
1998年 | 51篇 |
1997年 | 49篇 |
1996年 | 45篇 |
1995年 | 23篇 |
1994年 | 26篇 |
1993年 | 20篇 |
1992年 | 11篇 |
1991年 | 9篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 7篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 10篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 9篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 1篇 |
1936年 | 3篇 |
排序方式: 共有2091条查询结果,搜索用时 31 毫秒
61.
The aim of the paper is to estimate the density functions or distribution functions measured by Wasserstein metric, a typical kind of statistical distances, which is usually required in the statistical learningBased on the classical Bernstein approximation, a scheme is presented.To get the error estimates of the scheme, the problem turns to estimating the L1 norm of the Bernstein approximation for monotone C-1functions, which was rarely discussed in the classical approximation theoryFinally, we get a probability estimate by the statistical distance. 相似文献
62.
In this paper, we study the weighted Korn inequality on some irregular domains, e.g., s-John domains and domains satisfying quasihyperbolic boundary conditions. Examples regarding sharpness of the Korn inequality on these domains are presented. Moreover, we show that Korn inequalities imply certain Poincaré inequality. 相似文献
63.
64.
66.
In this note we consider the Schrödinger equation on compact manifolds equipped with possibly degenerate metrics. We prove Strichartz estimates with a loss of derivatives. The rate of loss of derivatives depends on the degeneracy of metrics. For the non-degenerate case we obtain, as an application of the main result, the same Strichartz estimates as that in the elliptic case. This extends Strichartz estimates for Riemannian metrics proved by Burq-Gérard-Tzvetkov to the non-elliptic case and improves the result by Salort for the degenerate case. We also investigate the optimality of the result for the case on 𝕊3 × 𝕊3. 相似文献
67.
在完备的度量空间中,讨论了一类新型的非线性压缩映射ρ(Tx,Ty)≤a(ρ(x,y))ρ(x,Tx)+b(ρ(x,y))ρ(y,Ty)+c(ρ(x,y))ρ(x,y)通过构造迭代序列,指出该映射的不动点的存在性和唯一性,并给出相应的误差估计式,拓展和改进了有关文献的范围. 相似文献
68.
Let (X, d, μ) be a metric measure space with non-negative Ricci curvature. This paper is concerned with the boundary behavior of harmonic function on the (open) upper half-space . We derive that a function f of bounded mean oscillation (BMO) is the trace of harmonic function on , whenever u satisfies the following Carleson measure condition where denotes the total gradient and denotes the (open) ball centered at with radius . Conversely, the above condition characterizes all the harmonic functions whose traces are in BMO space. 相似文献
69.
广义度量空间理论是一般拓扑学研究的重要课题。本文综述了90年代广义度量空间理论的成就,分析了它的主要研究课题,所取得的重要结果是国内学者在该方向的贡献。 相似文献
70.
In this paper, we introduce horizontal and vertical warped product Finsler manifolds. We prove that every C-reducible or proper Berwaldian doubly warped product Finsler manifold is Riemannian. Then, we find the relation between Riemannian curvatures of doubly warped product Finsler manifold and its components, and consider the cases that this manifold is flat or has scalar flag curvature. We define the doubly warped Sasaki-Matsumoto metric for warped product manifolds and find a condition under which the horizontal and vertical tangent bundles are totally geodesic. We obtain some conditions under which a foliated manifold reduces to a Reinhart manifold. Finally, we study an almost complex structure on the tangent bundle of a doubly warped product Finsler manifold. 相似文献