全文获取类型
收费全文 | 3410篇 |
免费 | 42篇 |
国内免费 | 2篇 |
专业分类
化学 | 46篇 |
力学 | 13篇 |
数学 | 3230篇 |
物理学 | 165篇 |
出版年
2023年 | 4篇 |
2022年 | 9篇 |
2021年 | 4篇 |
2020年 | 2篇 |
2019年 | 80篇 |
2018年 | 77篇 |
2017年 | 36篇 |
2016年 | 24篇 |
2015年 | 36篇 |
2014年 | 93篇 |
2013年 | 203篇 |
2012年 | 94篇 |
2011年 | 196篇 |
2010年 | 206篇 |
2009年 | 266篇 |
2008年 | 264篇 |
2007年 | 314篇 |
2006年 | 239篇 |
2005年 | 140篇 |
2004年 | 119篇 |
2003年 | 126篇 |
2002年 | 82篇 |
2001年 | 57篇 |
2000年 | 76篇 |
1999年 | 89篇 |
1998年 | 71篇 |
1997年 | 55篇 |
1996年 | 77篇 |
1995年 | 75篇 |
1994年 | 69篇 |
1993年 | 52篇 |
1992年 | 32篇 |
1991年 | 11篇 |
1990年 | 14篇 |
1989年 | 16篇 |
1988年 | 9篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 18篇 |
1984年 | 30篇 |
1983年 | 7篇 |
1982年 | 22篇 |
1981年 | 15篇 |
1980年 | 7篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有3454条查询结果,搜索用时 328 毫秒
101.
Chi-Keung Cheung 《Journal of Geometric Analysis》1992,2(2):105-119
In this paper we considered curvature conditions on a Kähler-Einstein surface of general type. In particular we showed that it has negative holomorphic sectional curvature if theL 2-norm of (3C 2 ?C 1 2 )/C 1 2 is sufficiently small, whereC 1 andC 2 are the first and second Chern classes of the surfaces. This generalizes a result of Yau on the uniformization of Kähler-Einstein surfaces of general type and with 3C 2 ?C 1 2 = 0. Also in the process, we obtain a necessary condition in terms of an inequality between Chern numbers for a Kähler-Einstein metric to have negative holomorphic sectional curvature. 相似文献
102.
It is shown to be consistent that countable, Fréchet,
1-spaces are first countable. The result is obtained by using a countable support iteration of proper partial orders of length
2.The research of both authors is partially supported by NSERC 相似文献
103.
The color of a complex number is defined as the number of vertices of the convex hull of powers of that number. This induces a coloring of the unit disk. The structure of the set of points where the color changes is investigated here. It is observed that there is a connection between this fractal set and some family of trinomial equations. Three algorithms for coloring the unit disk are described, the last one (related to the Farey sequence) arising out of a conjecture. This conjecture is formulated and proved in this presentation. 相似文献
104.
We add to the known examples of complete Kähler manifolds with negative sectional curvature by showing that the following three classes of domains in euclidean spaces also belong: perturbations of ellipsoidal domains in ?n, intersections of complex-ellipsoidal domains in ?2, and intersections of fractional linear transforms of the unit ball in ?2. In the process, we prove the following theorem in differential geometry: in the intersection of two complex-ellipsoidal domains in ?2, the sum of the Bergman metrics is a Kähler metric with negative curvature operator. 相似文献
105.
For point processes we establish a link between integration‐by‐parts‐ and splitting‐formulas which can also be considered as integration‐by‐parts‐formulas of a new type. First we characterize finite Papangelou processes in terms of their splitting kernels. The main part then consists in extending these results to the case of infinitely extended Papangelou and, in particular, Pólya and Gibbs processes. 相似文献
106.
We construct cup and cap products in intersection (co)homology with field coefficients. The existence of the cap product allows us to give a new proof of Poincaré duality in intersection (co)homology which is similar in spirit to the usual proof for ordinary (co)homology of manifolds. 相似文献
107.
A continuous time random walk (CTRW) is a random walk in which both spatial changes represented by jumps and waiting times between the jumps are random. The CTRW is coupled if a jump and its preceding or following waiting time are dependent random variables (r.v.), respectively. The aim of this paper is to explain the occurrence of different limit processes for CTRWs with forward- or backward-coupling in Straka and Henry (2011) [37] using marked point processes. We also establish a series representation for the different limits. The methods used also allow us to solve an open problem concerning residual order statistics by LePage (1981) [20]. 相似文献
108.
Motivated by motivic zeta function calculations, Vakil and Wood in [10] made several conjectures regarding the topology of subspaces of symmetric products. The purpose of this note is to prove two of these conjectures and disprove a strengthening of one of them. 相似文献
109.
In this paper we propose and study a generalized time dependent Ginzburg-Landau model for superconductivity in which the temperature appears as a variable rather than a parameter. The model is derived by using the general theory of thermodynamics for non-isothermal phase transitions developed by Penrose-Fife and Alt-Pawlow. The global existence of classical solutions of the model is established by using Leray-Schauder fixed point theorem 相似文献
110.
B. Silbermann 《Applicable analysis》2013,92(3):185-197
In order to optimize the stability regions we construct families of k multi-step methods with free parameters and of order k+1. We exhibit parameters for which the real interval of stability is arbitrarly large and using the Flexible Tolerance Method we show how these parameters optimize - under a predefined criterion - the stability region. Computational experience, while limited, has indicated that the procedure is efficient 相似文献