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   23413篇
  免费   2584篇
  国内免费   1707篇
电工技术   2112篇
技术理论   7篇
综合类   3289篇
化学工业   562篇
金属工艺   215篇
机械仪表   1129篇
建筑科学   8637篇
矿业工程   345篇
能源动力   342篇
轻工业   346篇
水利工程   203篇
石油天然气   442篇
武器工业   233篇
无线电   2490篇
一般工业技术   1485篇
冶金工业   242篇
原子能技术   163篇
自动化技术   5462篇
  2024年   75篇
  2023年   282篇
  2022年   538篇
  2021年   596篇
  2020年   630篇
  2019年   526篇
  2018年   522篇
  2017年   636篇
  2016年   805篇
  2015年   916篇
  2014年   1696篇
  2013年   1366篇
  2012年   1839篇
  2011年   1985篇
  2010年   1731篇
  2009年   1690篇
  2008年   1667篇
  2007年   1822篇
  2006年   1595篇
  2005年   1239篇
  2004年   984篇
  2003年   803篇
  2002年   650篇
  2001年   565篇
  2000年   512篇
  1999年   407篇
  1998年   292篇
  1997年   216篇
  1996年   191篇
  1995年   181篇
  1994年   144篇
  1993年   109篇
  1992年   116篇
  1991年   59篇
  1990年   53篇
  1989年   54篇
  1988年   46篇
  1987年   25篇
  1986年   22篇
  1985年   15篇
  1984年   12篇
  1983年   8篇
  1982年   13篇
  1981年   14篇
  1980年   11篇
  1979年   7篇
  1978年   6篇
  1977年   6篇
  1976年   5篇
  1959年   7篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
61.
Many problems in geophysics, acoustics, elasticity theory, cancer treatment, food process control and electrodynamics involve study of wave field synthesis (WFS) in some form or another. In the present work, modelling of wave propagation phenomena is studied as a static problem, using finite element method and treating time as an additional spatial dimension. In particular, WFS problems are analysed using discrete methods. It is shown that a fully finite element-based scheme is very natural and effective method for the solution of such problems. Distributed WFS in the context of two-dimensional problems is outlined and incorporation of any geometric or material non-linearities is shown to be straightforward. This has significant implications for problems in geophysics or biological media, where material inhomogeneities are quite prevalent. Numerical results are presented for several problems referring to media with material inhomogeneities and predefined absorption profiles. The method can be extended to three-dimensional problems involving anisotropic media properties in a relatively straightforward manner. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   
62.
We propose a generalized null space uncorrelated Fisher discriminant analysis (GNUFDA) technique integrating the uncorrelated discriminant analysis and weighted pairwise Fisher criterion. The GNUFDA can effectively deal with the small sample-size problem and perform satisfactorily when the dimensionality of the null space decreases with increase in the number of training samples per class and/or classes, C. The proposed GNUFDA can extract at most C-1 optimal uncorrelated discriminative vectors without being influenced by the null-space dimensionality.  相似文献   
63.
非线性地基上桩结构物空间分析   总被引:1,自引:0,他引:1  
本文提出了桩结构物-非线性地基空间相互作用分析的迭代法和非线性有限元法。其中,桩基分析用p-y曲线法。结合实际结构物进行了大量的计算及比较分析,成果是令人满意的,可以付诸应用。  相似文献   
64.
石油钻机司钻工作空间设计   总被引:1,自引:0,他引:1  
在对国产石油钻机司钻控制房调查的基础上,本着“以人为本”的设计理念,结合人机工程学理论,对司钻控制系统中的显示、操纵装置进行了分析,并给出了便于人操作的合理空间尺寸。  相似文献   
65.
In this paper an original variant of the Schwarz domain decomposition method is introduced for heterogeneous media. This method uses new optimized interface conditions specially designed to take into account the heterogeneity between the sub-domains on each sides of the interfaces. Numerical experiments illustrate the dependency of the proposed method with respect to several parameters, and confirm the robustness and efficiency of this method based on such optimized interface conditions. Several mesh partitions taking into account multiple cross points are considered in these experiments.  相似文献   
66.
Markovian and semi-Markovian random processes are used to analyze the problem of optimal search for signals in a multichannel communication system with arbitrarily distributed random outputs. The search efficiency factor is found in explicit form based on state space merging, and a mathematical programming problem is set up to find a numerical suboptimal solution. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 3, pp. 144–150, May–June 2007.  相似文献   
67.
The measure-theoretic definition of Kullback-Leibler relative-entropy (or simply KL-entropy) plays a basic role in defining various classical information measures on general spaces. Entropy, mutual information and conditional forms of entropy can be expressed in terms of KL-entropy and hence properties of their measure-theoretic analogs will follow from those of measure-theoretic KL-entropy. These measure-theoretic definitions are key to extending the ergodic theorems of information theory to non-discrete cases. A fundamental theorem in this respect is the Gelfand-Yaglom-Perez (GYP) Theorem [M.S. Pinsker, Information and Information Stability of Random Variables and Process, 1960, Holden-Day, San Francisco, CA (English ed., 1964, translated and edited by Amiel Feinstein), Theorem. 2.4.2] which states that measure-theoretic relative-entropy equals the supremum of relative-entropies over all measurable partitions. This paper states and proves the GYP-theorem for Rényi relative-entropy of order greater than one. Consequently, the result can be easily extended to Tsallis relative-entropy.  相似文献   
68.
CIE TC8‐01 has adopted a new color appearance model: CIECAM021 replaces the CIECAM97s.2 The new model consists of a number of refinements and simplifications of the CIECAM97s color appearance model. This article describes further tests to the robustness of the forward and reverse modes. © 2005 Wiley Periodicals, Inc. Col Res Appl, 30, 99–106, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20087  相似文献   
69.
康续瀚  周亚军 《山西建筑》2007,33(30):54-55
介绍了法西斯大厦的基本情况,通过对朱赛普·特拉尼的代表作法西斯大厦的空间结构、承重结构、围护结构、立面结构的分析,以使人们更深刻地理解特拉尼的建筑思想,探索其积极的现实意义。  相似文献   
70.
An Efficient Code-Based Voxel-Traversing Algorithm   总被引:3,自引:1,他引:2  
The paper considers an efficient approach to traversing a uniformly-subdivided space pierced by a line segment. A voxel, as the basic constituent element of the uniformly subdivided space, is restricted to having the form of a cube. The algorithm works in two steps. In the first step, the so-called Bresenham voxels are identified and, by comparing their position codes, their type of connectivity is determined. To achieve the required connectivity between neighbouring voxels, the second step of the algorithm is applied to find the missing voxels. In this way, the algorithm efficiently switches between face-, edge- and vertex-connectivity. Although the algorithm works with oating-point precision, it is extremely computationally efficient, and tests of speed compared with the Müller, Cleary & Wyvill, Amanatides & Woo, and Zemčik algorithms are described.  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