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   59403篇
  免费   6391篇
  国内免费   6832篇
化学   26012篇
晶体学   1184篇
力学   10908篇
综合类   844篇
数学   15844篇
物理学   17834篇
  2024年   107篇
  2023年   572篇
  2022年   1060篇
  2021年   1231篇
  2020年   1653篇
  2019年   1512篇
  2018年   1430篇
  2017年   1936篇
  2016年   2208篇
  2015年   1824篇
  2014年   2708篇
  2013年   4402篇
  2012年   3510篇
  2011年   3791篇
  2010年   3165篇
  2009年   3677篇
  2008年   3594篇
  2007年   3807篇
  2006年   3452篇
  2005年   3267篇
  2004年   2894篇
  2003年   2544篇
  2002年   2192篇
  2001年   1845篇
  2000年   2562篇
  1999年   2043篇
  1998年   1872篇
  1997年   1201篇
  1996年   1031篇
  1995年   877篇
  1994年   813篇
  1993年   648篇
  1992年   651篇
  1991年   483篇
  1990年   374篇
  1989年   298篇
  1988年   229篇
  1987年   175篇
  1986年   121篇
  1985年   158篇
  1984年   138篇
  1983年   70篇
  1982年   95篇
  1981年   91篇
  1980年   48篇
  1979年   66篇
  1978年   49篇
  1977年   49篇
  1976年   24篇
  1973年   16篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
利用TRS方法对双奇核164Lu的位能面进行了计算,确认了164Lu核的一条三轴超形变带,结果与实验较好地符合,同时指出了三轴超形变带的一个具体的组态  相似文献   
152.
广义最小偏差法(GLDM)是层次分析中一种重要的排序方法.本文讨论了广义最小偏差法的性质和灵敏度分析问题.  相似文献   
153.
映象方程多解问题的某些研究   总被引:1,自引:0,他引:1  
本文用fp-同伦方法,在一定的技巧和变换的配合下,在紧性条件支持下,研究了赋范线性空间中一类集值映象方程的多解问题。还给出所得理论结果的一个应用。  相似文献   
154.
Efficient sequential quadratic programming (SQP) implementations are presented for equality-constrained, discrete-time, optimal control problems. The algorithm developed calculates the search direction for the equality-based variant of SQP and is applicable to problems with either fixed or free final time. Problem solutions are obtained by solving iteratively a series of constrained quadratic programs. The number of mathematical operations required for each iteration is proportional to the number of discrete times N. This is contrasted by conventional methods in which this number is proportional to N 3. The algorithm results in quadratic convergence of the iterates under the same conditions as those for SQP and simplifies to an existing dynamic programming approach when there are no constraints and the final time is fixed. A simple test problem and two application problems are presented. The application examples include a satellite dynamics problem and a set of brachistochrone problems involving viscous friction.  相似文献   
155.
A Modified SQP Method and Its Global Convergence   总被引:6,自引:0,他引:6  
The sequential quadratic programming method developed by Wilson, Han andPowell may fail if the quadratic programming subproblems become infeasibleor if the associated sequence of search directions is unbounded. In [1], Hanand Burke give a modification to this method wherein the QP subproblem isaltered in a way which guarantees that the associated constraint region isnonempty and for which a robust convergence theory is established. In thispaper, we give a modification to the QP subproblem and provide a modifiedSQP method. Under some conditions, we prove that the algorithm eitherterminates at a Kuhn–Tucker point within finite steps or generates aninfinite sequence whose every cluster is a Kuhn–Tucker point.Finally, we give some numerical examples.  相似文献   
156.
Ahn  In-Ae  Woong Kim  Sang  Ro  Seonggu 《Molecular diversity》1998,4(1):23-24
Peptides containing azaglycine located terminally or within the backbone have been prepared in the solid phase by means of an automatic synthesizer.  相似文献   
157.
对一类变形的变分不等式:求,使得提出了一类投影收缩算法,并得到了该算法的收敛性及相关性质.  相似文献   
158.
Two types of mechanisms are proposed for mound coarsening during unstable epitaxial growth: stochastic, due to deposition noise, and deterministic, due to mass currents driven by surface energy differences. Both yield the relation H=(RWL)2 between the typical mound height W, mound size L, and the film thickness H. An analysis of simulations and experimental data shows that the parameter R saturates to a value which discriminates sharply between stochastic () and deterministic () coarsening. We derive a scaling relation between the coarsening exponent 1/z and the mound-height exponent which, for a saturated mound slope, yields . Received: 11 November 1997 / Revised in final form: 28 November 1997 / Accepted: 28 November 1997  相似文献   
159.
We have observed a remarkable two-armed spiral in the collapse process of a floating monolayer at the air-water interface by phase contrast microscopy. This demonstrates that the floating monolayer as a form of soft condensed matter reorganizes itself due to a certain kind of macroscopic or collective behavior of molecules as it collapses. This pattern formation is caused by the breakdown of a critical dynamical balance between the deformation of solid domain and the applied surface pressure. The fragility as well as the flexibility of the floating monolayer can be associated with the observed pattern growth. There are also observed interesting, periodically arranged collections of molecules in numerous collapsed regions. Received: 8 July 1997 / Accepted: 4 November 1997  相似文献   
160.
将弹性有限变形问题纳入Lagrange力学的理论体系中,并用经典力学中业已存在的Routh方法构建了有限变形平面应变问题和有限变形平面应力问题的基本微分方程,讨论了有限变形大挠度问题vonkarman方程中存在的矛盾进而提出了两种改进方案.  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