全文获取类型
收费全文 | 1507篇 |
免费 | 50篇 |
国内免费 | 138篇 |
专业分类
化学 | 92篇 |
晶体学 | 1篇 |
力学 | 32篇 |
综合类 | 10篇 |
数学 | 1017篇 |
物理学 | 203篇 |
综合类 | 340篇 |
出版年
2024年 | 1篇 |
2023年 | 11篇 |
2022年 | 15篇 |
2021年 | 19篇 |
2020年 | 22篇 |
2019年 | 30篇 |
2018年 | 40篇 |
2017年 | 30篇 |
2016年 | 32篇 |
2015年 | 23篇 |
2014年 | 53篇 |
2013年 | 140篇 |
2012年 | 47篇 |
2011年 | 64篇 |
2010年 | 51篇 |
2009年 | 98篇 |
2008年 | 111篇 |
2007年 | 107篇 |
2006年 | 84篇 |
2005年 | 66篇 |
2004年 | 72篇 |
2003年 | 67篇 |
2002年 | 54篇 |
2001年 | 63篇 |
2000年 | 54篇 |
1999年 | 55篇 |
1998年 | 48篇 |
1997年 | 41篇 |
1996年 | 39篇 |
1995年 | 16篇 |
1994年 | 16篇 |
1993年 | 20篇 |
1992年 | 23篇 |
1991年 | 18篇 |
1990年 | 12篇 |
1989年 | 7篇 |
1988年 | 13篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 2篇 |
排序方式: 共有1695条查询结果,搜索用时 8 毫秒
161.
K. B. Athreya 《Proceedings Mathematical Sciences》1994,104(1):263-267
Letf be a probability generating function on [0, 1]. The convergence of its iteratesf
n
to fixed points is studied in this paper. Results include rates forf andf
-1. Also iterates of independent identically distributed stable processes are studied and a trichotomy based on the order of
the stability is established.
Dedicated to the memory of Professor K G Ramanathan 相似文献
162.
Subhashis Nag 《Proceedings Mathematical Sciences》1991,101(3):215-218
The Sampson-Wolf model of Teichmüller space (using harmonic mappings) is shown to be exactly the same as the more recent Hitchin
model (utilizing self-dual connections). Indeed, it is noted how the self-duality equations become the harmonicity equations.
An interpretation of the modular group action in this model is mentioned. 相似文献
163.
Rodrigo P. Gomez 《manuscripta mathematica》1997,93(1):325-335
In this article we study the behavior of harmonic maps from compact connected Lie groups with bi-invariant metrics into a
Hilbert orthogonal group. In particular, we will demonstrate that any such harmonic map always has image contained within
someO(n),n<∞. Since homomorphisms are a special subset of the harmonic maps we get as a corollary an extension of the Peter-Weyl theorem,
namely, that every representation of a connected compact Lie group is finite dimensional.
This article was processed by the author using the LATEX style filecljour1 from Springer-Verlag. 相似文献
164.
E. Steiner 《Theoretical chemistry accounts》1982,60(6):561-572
Electron density-difference maps, used to study the changes that occur when a molecule changes its state or when the nuclei of a molecule change their relative positions, are generally useful only if the atomic densities cancel when one molecular density distribution is subtracted from the other. When, as in the case of the nonrigid internal rotation in ethane, such a cancellation of atomic densities is not possible the method of simple subtraction is no longer appropriate. It is shown that useful density-difference maps can nevertheless be obtained, when the changes in geometric parameters are small, by the calculation of two generalized density-difference functions: a point difference function which allows a comparison of the densities at corresponding points in the two systems, and a volume difference function to compare the amounts of charge in corresponding regions. The method is illustrated by consideration of a change in bond length of the nitrogen molecule and by the nonrigid internal rotation in ethane.Presented at the XIVth Quantum Theory Conference in Canterbury, England, September 1981. 相似文献
165.
166.
Sensitivity analysis in multiobjective optimization 总被引:6,自引:0,他引:6
T. Tanino 《Journal of Optimization Theory and Applications》1988,56(3):479-499
Sensitivity analysis in multiobjective optimization is dealt with in this paper. Given a family of parametrized multiobjective optimization problems, the perturbation map is defined as the set-valued map which associates to each parameter value the set of minimal points of the perturbed feasible set in the objective space with respect to a fixed ordering convex cone. The behavior of the perturbation map is analyzed quantitatively by using the concept of contingent derivatives for set-valued maps. Particularly, it is shown that the sensitivity is closely related to the Lagrange multipliers in multiobjective programming.This research was made while the author stayed at the International Institute for Applied Systems Analysis, Laxenburg, Austria.The author would like to thank an anonymous referee for his helpful suggestions; particularly, he pointed out that Proposition 2.2 and Theorem 2.1 are valid also in infinite-dimensional spaces. 相似文献
167.
168.
We show that the Loewner equation generates slits if the driving term is Hölder continuous with exponent 1/2 and small norm and that this is best possible.
169.
Let E be a real normed linear space, K be a nonempty subset of E and be a uniformly continuous generalized Φ-hemi-contractive mapping, i.e., , and there exist x∗∈F(T) and a strictly increasing function , Φ(0)=0 such that for all x∈K, there exists j(x−x∗)∈J(x−x∗) such that
〈Tx−x∗,j(x−x∗)〉?‖x−x∗‖2−Φ(‖x−x∗‖). 相似文献
170.
首先引进一个新的空间,然后在该空间上讨论了具有反交换的映射族的唯一公共不动点的存在问题.所得结论推广和改进了一些相应结果. 相似文献