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   48863篇
  免费   10893篇
  国内免费   2365篇
化学   50199篇
晶体学   495篇
力学   1113篇
综合类   110篇
数学   3450篇
物理学   6754篇
  2024年   36篇
  2023年   220篇
  2022年   458篇
  2021年   620篇
  2020年   1635篇
  2019年   2945篇
  2018年   1345篇
  2017年   998篇
  2016年   3871篇
  2015年   3993篇
  2014年   4102篇
  2013年   4975篇
  2012年   4165篇
  2011年   3400篇
  2010年   3623篇
  2009年   3510篇
  2008年   3278篇
  2007年   2545篇
  2006年   2215篇
  2005年   2223篇
  2004年   1980篇
  2003年   1809篇
  2002年   2483篇
  2001年   1735篇
  2000年   1509篇
  1999年   645篇
  1998年   224篇
  1997年   163篇
  1996年   178篇
  1995年   162篇
  1994年   137篇
  1993年   137篇
  1992年   109篇
  1991年   98篇
  1990年   81篇
  1989年   85篇
  1988年   46篇
  1987年   48篇
  1986年   38篇
  1985年   54篇
  1984年   23篇
  1983年   20篇
  1982年   22篇
  1981年   23篇
  1980年   17篇
  1977年   10篇
  1959年   12篇
  1958年   11篇
  1957年   15篇
  1956年   10篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
It is proved that the variety of relevant disjunction lattices has the finite embeddability property. It follows that Avron's relevance logic RMI min has a strong form of the finite model property, so it has a solvable deducibility problem. This strengthens Avron's result that RMI min is decidable. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   
62.
We have investigated the quantum mechanical effect of the underdamped, critically damped, and overdamped electric circuits with a power source. The charge of the underdamped circuit oscillates while those of the critically damped and overdamped ones don't. The wave function of the system of overdamped circuit represented parabolic cylinder function while underdamped circuit was represented by well-known Hermite polynomial. The eigenvalues of underdamped circuit is discrete while those of the critically damped and overdamped ones are given as continuously.  相似文献   
63.
离子交换富集-导数火焰原子吸收法测定自来水中Cu,Fe和Zn   总被引:7,自引:0,他引:7  
本文研究了用 2 0 1× 7阳离子交换树脂对自来水中的微量元素进行交换富集 ,采用微量脉冲进样 导数火焰原子吸收法测定富集后溶液中的Cu ,Fe和Zn ,该方法灵敏度分别为 0 2 9,0 5 9和 0 0 6 μg·L- 1 ,精密度分别为 4 2 8% ,1 95 %和 2 2 8% ,检测限分别为 1 2 8,5 85和 0 6 8μg·L- 1 ,回收率分别为 91 13% ,10 1 34%和99 84 % ,本方法大大减少了需样量 ,简便快速 ,灵敏度高。  相似文献   
64.
Ji  X.    B. 《Optical and Quantum Electronics》2003,35(8):749-755
Based on the Collins formula and irradiance moments definition, the propagation of the kurtosis parameter of super-Gaussian beams through a spherically aberrated lens is studied. Detailed numerical results are given. It is shown that, as compared with aberration-free super-Gaussian beams, the profile of spherically aberrated super-Gaussian beams can be leptokurtic, mesokurtic or platykurtic, depending on the aberration and propagation distance. The results for the spherically aberrated Gaussian beams can be dealt with as a special case treated in this paper. Finally, the advantage of our method is pointed out.  相似文献   
65.
A (w,r) cover‐free family is a family of subsets of a finite set such that no intersection of w members of the family is covered by a union of r others. A (w,r) superimposed code is the incidence matrix of such a family. Such a family also arises in cryptography as the concept of key distribution pattern. In the present paper, we give some new results on superimposed codes. First we construct superimposed codes from super‐simple designs which give us results better than superimposed codes constructed by other known methods. Next we prove the uniqueness of the (1,2) superimposed code of size 9 × 12, the (2,2) superimposed code of size 14 × 8, and the (2,3) superimposed code of size 30 × 10. Finally, we improve numerical values of upper bounds for the asymptotic rate of some (w,r) superimposed codes. © 2004 Wiley Periodicals, Inc.  相似文献   
66.
Summary Some estimators of maximum likelihood type are constructed for estimating functionals of one-dimensional Gibbs states. We also show that those estimators are strongly consistent, asymptotically normal and asymptotically efficient.  相似文献   
67.
We present an interpolating, univariate subdivision scheme which preserves the discrete curvature and tangent direction at each step of subdivision. Since the polygon have a geometric information of some original (in some sense) curve as a discrete curvature, we can expect that the limit curve has the same curvature at each vertex as the control polygon. We estimate the curvature bound of odd vertices and give an error estimate for restoring a curve from sampled vertices on curves.  相似文献   
68.
69.
70.
A graph G is N2locally connected if for every vertex ν in G, the edges not incident with ν but having at least one end adjacent to ν in G induce a connected graph. In 1990, Ryjá?ek conjectured that every 3‐connected N2‐locally connected claw‐free graph is Hamiltonian. This conjecture is proved in this note. © 2004 Wiley Periodicals, Inc. J Graph Theory 48: 142–146, 2005  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