首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1637篇
  免费   47篇
  国内免费   122篇
化学   91篇
晶体学   1篇
力学   37篇
综合类   10篇
数学   1429篇
物理学   238篇
  2024年   2篇
  2023年   19篇
  2022年   19篇
  2021年   22篇
  2020年   24篇
  2019年   29篇
  2018年   39篇
  2017年   31篇
  2016年   27篇
  2015年   20篇
  2014年   57篇
  2013年   176篇
  2012年   77篇
  2011年   63篇
  2010年   58篇
  2009年   104篇
  2008年   122篇
  2007年   103篇
  2006年   96篇
  2005年   68篇
  2004年   73篇
  2003年   69篇
  2002年   44篇
  2001年   56篇
  2000年   56篇
  1999年   42篇
  1998年   46篇
  1997年   37篇
  1996年   46篇
  1995年   16篇
  1994年   17篇
  1993年   17篇
  1992年   17篇
  1991年   13篇
  1990年   11篇
  1989年   5篇
  1988年   11篇
  1987年   5篇
  1986年   5篇
  1985年   7篇
  1984年   8篇
  1983年   3篇
  1982年   11篇
  1981年   6篇
  1980年   11篇
  1979年   3篇
  1978年   4篇
  1977年   7篇
  1976年   3篇
  1974年   1篇
排序方式: 共有1806条查询结果,搜索用时 15 毫秒
21.
We investigate holomorphic maps between compact generalized Hopf manifolds (i.e., locally conformal Kähler manifolds with parallel Lee form). We show that they preserve the canonical foliations. Moreover, we study compact complex submanifolds of g.H. manifolds and holomorphic submersions from compact g.H. manifolds.  相似文献   
22.
张伦传 《数学进展》2002,31(3):275-278
给出了可补Hilbert C^*-模一系列等价刻画,获得了一类有界模映射的分解定理。  相似文献   
23.
Generalized Equilibrium Problems and Generalized Complementarity Problems   总被引:2,自引:0,他引:2  
From a general minimax inequality or an abstract lopsided saddle-point theorem, we deduce general Karamardian-type equilibrium theorems and generalized complementarity theorems. Our new results extend a number of well-known earlier works of many authors.  相似文献   
24.
王勤 《数学杂志》1997,17(4):468-472
记X为复数域上无限维Banach空间,H为无限维复可分Hilert空间。本文给出B(X)上保持点谱的满射可加射具有的形式,以及B(H)上某些初等算子保点谱的充要条件。  相似文献   
25.
Let f and g be two permutable transcendental holomorphic maps in the plane. We shall discuss the dynamical properties of f, g and f o g and prove, among other things, that if either f has no wandering domains or f is of bounded type, then the Julia sets of f and f(g) coincide. Dedicated to Professor Sheng GONG on the occasion of his 75th birthday  相似文献   
26.
Two results on product of compact filters are shown to be the common principle behind a surprisingly large number of theorems.  相似文献   
27.
In a general measure-theoretic context, it is proved that the action of a stochastic map on a pair of probability distributions can be characterized by the criterion of decreasing mixing distance.  相似文献   
28.
Poisson-Lie T-duality in N = 2 superconformal WZNW models on the real Lie groups is considered. It is shown that Poisson-Lie T-duality is governed by the complexifications of the corresponding real groups endowed with Semenov-Tian-Shansky symplectic forms, i.e. Heisenberg doubles. Complex Heisenberg doubles are used to define on the group manifolds of the N = 2 superconformal WZNW models the natural actions of the isotropic complex subgroups forming the doubles. It is proved that with respect to these actions N = 2 superconformal WZNW models admit Poisson-Lie symmetries. The Poisson-Lie T-duality transformation maps each model onto itself but acts non-trivially on the space of classical solutions.  相似文献   
29.
On the numerical solution of a class of Stackelberg problems   总被引:1,自引:0,他引:1  
This study tries to develop two new approaches to the numerical solution of Stackelberg problems. In both of them the tools of nonsmooth analysis are extensively exploited; in particular we utilize some results concerning the differentiability of marginal functions and some stability results concerning the solutions of convex programs. The approaches are illustrated by simple examples and an optimum design problem with an elliptic variational inequality.Prepared while the author was visiting the Department of Mathematics, University of Bayreuth as a guest of the FSP Anwendungsbezogene Optimierung und Steuerung.  相似文献   
30.
In this paper, we consider a convex program with either a finite or an infinite number of constraints and its formal Lagrangian dual. We show that either the primal program satisfies a general condition which implies there is no duality gap or that there is a nonzero vectord with the following properties: First, wheneverd is added to the objective function, where is a positive number not greater than one, the resulting program satisfies the general sufficient condition cited above for no duality gap. Second, the optimal value of this perturbed program is attained and tends to the optimal value of the original program as tends to zero. Third, the optimal solutions of the perturbed programs form a minimizing sequence of the original program. As a consequence of the above, we derive the limiting Lagrangian theory of Borwein, Duffin, and Jeroslow.The authors are indebted to an unknown referee who suggested the very short and elegant proofs of Lemma 2.3 and Theorem 2.3.This work was completed while the first author was a member of the College of Management, Georgia Institute of Technology, Atlanta, Georgia.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号