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   31122篇
  免费   5321篇
  国内免费   3858篇
化学   22704篇
晶体学   350篇
力学   1793篇
综合类   239篇
数学   3619篇
物理学   11596篇
  2024年   81篇
  2023年   683篇
  2022年   931篇
  2021年   1091篇
  2020年   1286篇
  2019年   1251篇
  2018年   1052篇
  2017年   916篇
  2016年   1455篇
  2015年   1421篇
  2014年   1762篇
  2013年   2255篇
  2012年   2772篇
  2011年   2724篇
  2010年   1945篇
  2009年   1727篇
  2008年   1962篇
  2007年   1853篇
  2006年   1693篇
  2005年   1540篇
  2004年   1108篇
  2003年   967篇
  2002年   994篇
  2001年   824篇
  2000年   657篇
  1999年   713篇
  1998年   597篇
  1997年   561篇
  1996年   559篇
  1995年   479篇
  1994年   406篇
  1993年   353篇
  1992年   291篇
  1991年   255篇
  1990年   242篇
  1989年   205篇
  1988年   138篇
  1987年   95篇
  1986年   91篇
  1985年   102篇
  1984年   73篇
  1983年   50篇
  1982年   47篇
  1981年   32篇
  1980年   20篇
  1979年   4篇
  1978年   3篇
  1977年   6篇
  1957年   6篇
  1916年   3篇
排序方式: 共有10000条查询结果,搜索用时 453 毫秒
131.
In this paper, variational conclusions of set-valued bifunctions on convex subsets of Banach spaces are investigated and several new results are obtained. The results are applied to the fixed point theory and variational inequalities. We obtain two fixed point theorems and existence theorems of solutions of variational inequalities.  相似文献   
132.
深能级杂质对光导半导体开关非线性特性的影响   总被引:2,自引:2,他引:0  
建立了非线性GaAs光导开关深能级杂质瞬态模型的基本方程,获得了与实验现象定性吻合的电流输出,给出了平均载流子随时间演化的情况.分析结果表明,在考虑了深能级杂质的俘获、发射和碰撞电离后,有可能对非线性光导开关中发生的一系列现象做出解释,进一步的仔细分析将对非线性光导开关的设计和制作提供理论指导.  相似文献   
133.
134.
Testing for additivity with B-splines   总被引:1,自引:0,他引:1  
Regression splines are often used for fitting nonparametric functions, and they work especially well for additivity models. In this paper, we consider two simple tests of additivity: an adaptation of Tukey's one degree of freedom test and a nonparametric version of Rao's score test. While the Tukey-type test can detect most forms of the local non-additivity at the parametric rate of O(n-1/2), the score test is consistent for all alternative at a nonparametric rate. The asymptotic distribution of these test statistics is derived under both the null and local alternative hypotheses. A simulation study is conducted to compare their finite-sample performances with some existing kernel-based tests. The score test is found to have a good overall performance.  相似文献   
135.
Lipase from Candida rugosa was covalently anchored onto acid-treated multi-walled carbon nanotubes (MWNTs) through a self-catalytic mechanism. A variety of characterization techniques including FTIR, Raman spectroscopy, and XPS were employed to demonstrate the formation of the ester linkage between lipase and MWNTs. The MWNTs-lipase biocomposites showed significantly increased solubility in some common-used organic solvents, such as THF, DMF and chloroform. This study may offer a novel and facile route for covalent modification of carbon nanotubes, and expand the potential utilization of both lipases and MWNTs in the fields of biocatalyst and biosensor.  相似文献   
136.
The existence of global error bound for convex inclusion problems is discussed in this paper, including pointwise global error bound and uniform global error bound. The existence of uniform global error bound has been carefully studied in Burke and Tseng (SIAM J. Optim. 6(2), 265–282, 1996) which unifies and extends many existing results. Our results on the uniform global error bound (see Theorem 3.2) generalize Theorem 9 in Burke and Tseng (1996) by weakening the constraint qualification and by widening the varying range of the parameter. As an application, the existence of global error bound for convex multifunctions is also discussed.  相似文献   
137.
The main aim of this paper is to provide convergence analysis of Quasi-Wilson nonconforming finite element to Maxwell's equations under arbitrary quadrilateral meshes.The error estimates are derived,which are the same as those for conforming elements under conventional regular meshes.  相似文献   
138.
Fabrication of bamboo-shaped GaN nanorods   总被引:1,自引:0,他引:1  
Bamboo-shaped GaN nanorods were formed through a simple sublimation method. They were characterized by means of X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and selected-area electron diffraction (SAED). The TEM image showed that the nanorods were bamboo-like. XRD, HRTEM and SAED patterns indicated that the nanorods were single-crystal wurtzite GaN. Received: 8 January 2001 / Accepted: 28 April 2001 / Published online: 20 December 2001  相似文献   
139.
A crystallization study has been carried out for rapidly solidified Bi2Pb0.5Sr2Ca4Cu5Ox glass. Glass transition temperature T g, crystallized superconducting phases and microstructural changes were measured and analysed by differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The crystallization mechanism of the three superconducting phases — (2201) 20 K phase, (2212) 80 K phase, and (2223) 110 K phase — has been discussed, and a time-temperature-transformation diagram for the glass has been constructed.  相似文献   
140.
The optical logic-operated moire,which is proposed on the basis of optical logicoperation,is a new method to obtain specific moire beat pattern.Its advantages lie in the ca-pability to select carrier-free,sharpened fringes with high contrast.The experimental methodand results of the application of the optical logic-operared moire in moire topography are pre-sented in this paper.  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