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   10123篇
  免费   873篇
  国内免费   907篇
化学   1966篇
晶体学   44篇
力学   1469篇
综合类   235篇
数学   5967篇
物理学   2222篇
  2024年   12篇
  2023年   90篇
  2022年   200篇
  2021年   230篇
  2020年   238篇
  2019年   235篇
  2018年   243篇
  2017年   285篇
  2016年   331篇
  2015年   249篇
  2014年   421篇
  2013年   691篇
  2012年   535篇
  2011年   589篇
  2010年   512篇
  2009年   668篇
  2008年   675篇
  2007年   601篇
  2006年   637篇
  2005年   476篇
  2004年   464篇
  2003年   453篇
  2002年   410篇
  2001年   389篇
  2000年   310篇
  1999年   313篇
  1998年   282篇
  1997年   251篇
  1996年   179篇
  1995年   149篇
  1994年   116篇
  1993年   101篇
  1992年   80篇
  1991年   68篇
  1990年   62篇
  1989年   50篇
  1988年   31篇
  1987年   38篇
  1986年   31篇
  1985年   35篇
  1984年   31篇
  1983年   19篇
  1982年   27篇
  1981年   32篇
  1980年   21篇
  1979年   13篇
  1978年   12篇
  1977年   3篇
  1976年   4篇
  1974年   3篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
1.
2.
We relate the distribution characters and the wave front sets of unitary representation for real reductive dual pairs of type I in the stable range.  相似文献   
3.
《Discrete Mathematics》2021,344(12):112589
Let N be the set of positive integers. For a nonempty set A of integers and every integer u, denote by dA(u) the number of (a,a) with a,aA such that u=aa. For a sequence S of positive integers, let S(x) be the counting function of S. The set AN is called a perfect difference set if dA(u)=1 for every positive integer u. In 2008, Cilleruelo and Nathanson (2008) [4] constructed dense perfect difference sets from dense Sidon sets. In this paper, as a main result, we prove that: let f:NN be an increasing function satisfying f(n)2 for any positive integer n, then for every Sidon set B and every function ω(x), there exists a set AN such that dA(u)=f(u) for every positive integer u and B(x/3)ω(x)A(x)B(x/3)+ω(x) for all xCf,B,ω.  相似文献   
4.
数据包络分析(DEA)是评价供应链系统(Supply chain system)间相对有效性的一种重要的工具,但是传统的DEA不考虑供应链的内部结构,对系统效率评价偏高;而本文所研究两阶段串联供应链系统,考虑把部分中间产品作为最终产品输出,增加额外中间投入的情形.基于所提出的供应链系统结构,本文建立相应的串联结构下的网络DEA模型,并针对所建立模型进行相关理论的研究,给出了串联结构下的生产可能集和规模收益情况判定方法.最后,进行数值实验,以验证我们提出的结论.  相似文献   
5.
Multivariate curve resolution methods, frequently used in analyzing bilinear data sets, result in ambiguous decomposition in general. Implementing the adequate constraints may lead to reduce the so-called rotational ambiguity drastically, and in the most favorable cases to the unique solution. However, in some special cases, non-negativity constraint as minimal information of the system is a sufficient condition to resolve profiles uniquely. Although, several studies on exploring the uniqueness of the bilinear non-negatively constrained multivariate curve resolution methods have been made in the literature, it has still remained a mysterious question. In 1995, Manne published his profile-based theorems giving the necessary and sufficient conditions of the unique resolution. In this study, a new term, i.e., data-based uniqueness is defined and investigated in details, and a general procedure is suggested for detection of uniquely recovered profile(s) on the basis of data set structure in the abstract space. Close inspection of Borgen plots of these data sets leads to realize the comprehensive information of local rank, and these argumentations furnish a basis for data-based uniqueness theorem. The reported phenomenon and its exploration is a new stage (it can be said fundament) in understanding and describing the bilinear (matrix-type) chemical data in general.  相似文献   
6.
In this work the results of the statistical topometric analysis of fracture surfaces of soda-lime-silica glass with and without ionic exchange treatment are reported. In this case, the mechanism of substitution is K+-Na+. atomic force microscopy (AFM) was employed to record the topometric data from the fracture surface. The roughness exponent (ζ) and the correlation length (ξ) were calculated by the variable bandwidth method. The analysis for both glasses (subjected and non-subjected to ionic exchange) for ζ shows a value ∼0.8, this value agrees well with that reported in the literature for rapid crack propagation in a variety of materials. The correlation length shows different values for each condition. These results, along with those of microhardness indentations suggest that the self-affine correlation length is influenced by the complex interactions of the stress field of microcracks with that resulting from the collective behavior of the point defects introduced by the strengthening mechanism of ionic exchange.  相似文献   
7.
Sensitivity analysis is a mathematical tool, first developed for optimization methods, which aim is to characterize a system response through the variations of its output parameters following modifications imposed on the input parameters of the system. Such an analysis may quickly become laborious when the thermal model under consideration is complex or the number of input parameters is high. In this paper, we develop a mathematical model to analyse the heat exchanges in four different types of solar air collectors. When building this thermal model we show that for each collector, at quasi-steady state, the energy balance equations of the components of the collector cascade into a single first-order non-linear differential equation that is able to predict the thermal behaviour of the collector. Our heat transfer model clearly demonstrates the existence of an important dimensionless parameter, referred to as the thermal performance factor of the collector, that compares the useful thermal energy which can be extracted from the heater to the overall thermal losses of that collector for a given set of input parameters. A sensitivity analysis of our thermal model has been performed for the most significant input parameters such as the incident solar irradiation, the inlet fluid temperature, the air mass flow rate, the depth of the fluid channel, the number and nature of the transparent covers in order to measure the impact of each of these parameters on our model. An important result which can be drawn from this study is that the heat transfer model developed is robust enough to be used for thermal design studies of most known flat plate solar air heaters, but also of flat plate solar water collectors and linear solar concentrators.  相似文献   
8.
9.
Balaganskii  V. S. 《Mathematical Notes》2002,72(5-6):752-756
Necessary conditions for the Gâteaux differentiability of the distance function to a set are considered. A series of characterizing results is obtained.  相似文献   
10.
本文研究了图有分数因子的度条件,得到了下面的结果:令k(?)1是一个整数,G是一个连通的n阶图,n(?)4k-3且最小度δ(G)(?)k,若对于每一对不相邻的顶点u,v∈V(G)都有max{d_G(u),d_G(v)}(?)n/2,则G有分数k-因子.并指出该结果在一定意义上是最好可能的。  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