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   20002篇
  免费   2595篇
  国内免费   1633篇
电工技术   1662篇
技术理论   1篇
综合类   2700篇
化学工业   792篇
金属工艺   463篇
机械仪表   2187篇
建筑科学   3619篇
矿业工程   1291篇
能源动力   502篇
轻工业   427篇
水利工程   718篇
石油天然气   419篇
武器工业   397篇
无线电   2323篇
一般工业技术   1576篇
冶金工业   485篇
原子能技术   143篇
自动化技术   4525篇
  2024年   83篇
  2023年   288篇
  2022年   461篇
  2021年   563篇
  2020年   641篇
  2019年   496篇
  2018年   525篇
  2017年   602篇
  2016年   736篇
  2015年   827篇
  2014年   1331篇
  2013年   1184篇
  2012年   1671篇
  2011年   1575篇
  2010年   1282篇
  2009年   1309篇
  2008年   1316篇
  2007年   1523篇
  2006年   1235篇
  2005年   1180篇
  2004年   927篇
  2003年   775篇
  2002年   615篇
  2001年   561篇
  2000年   522篇
  1999年   401篇
  1998年   294篇
  1997年   265篇
  1996年   191篇
  1995年   165篇
  1994年   188篇
  1993年   104篇
  1992年   74篇
  1991年   67篇
  1990年   47篇
  1989年   39篇
  1988年   31篇
  1987年   24篇
  1986年   17篇
  1985年   19篇
  1984年   18篇
  1983年   8篇
  1982年   14篇
  1981年   2篇
  1980年   4篇
  1979年   7篇
  1962年   3篇
  1959年   5篇
  1956年   2篇
  1955年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
This paper proposes a novel optimization algorithm inspired by the ions motion in nature. In fact, the proposed algorithm mimics the attraction and repulsion of anions and cations to perform optimization. The proposed algorithm is designed in such a way to have the least tuning parameters, low computational complexity, fast convergence, and high local optima avoidance. The performance of this algorithm is benchmarked on 10 standard test functions and compared to four well-known algorithms in the literature. The results demonstrate that the proposed algorithm is able to show very competitive results and has merits in solving challenging optimization problems.  相似文献   
2.
曾秋云 《电子科技》2015,28(4):116-119
基于传统AI-EBG结构,提出了一种小尺寸的增强型电磁带隙结构,实现了从0.5~9.4 GHz的宽频带-40 dB噪声抑制深度,且下截止频率减少到数百MHz,可有效抑制多层PCB板间地弹噪声。文中同时研究了EBG结构在高速电路应用时的信号完整性问题,使用差分信号方案可改善信号完整性。  相似文献   
3.
The scale along the coordinate axes in the equations of motion hitherto used for an H-maser (in relative units) is shown to depend on Q as the quality factor for an H-maser. This hinders both analysis of the operation of the H-maser and optimization of its parameters. The modified equations of motion proposed here do not have that shortcoming. We determine the atomic flux into the bulb that gives the H-maser the best metrological characteristics.  相似文献   
4.
When examined using continuous wave electron paramagnetic resonance and nuclear magnetic resonance spectrometers, the highT c superconductors give rise to intense, low field, ‘non-resonant’ absorption signals in the superconducting state. This phenomenon can be used as a highly sensitive, contactless technique for the detection and characterization of superconductivity even in samples containing only minute amounts of the superconducting phase. Further, it can also be applied to the determination of material parameters of interest such asJ c andH c2 in addition to being a powerful way of distinguishing between weak-link superconductivity and bulk superconductivity. The details of these aspects are discussed.  相似文献   
5.
The precise representation of rigid body motions in the displacement patterns of curved Timoshenko–Mindlin (TM) shell elements is considered. This consideration requires the development of the strain–displacement relationships of the TM shell theory with regard to their consistency with the rigid body motions. For this purpose a refined TM theory of multilayered anisotropic shells is elaborated. The effects of transverse shear deformation and bending‐extension coupling are included. The fundamental unknowns consist of five displacements and eight strains of the face surfaces of the shell, and eight stress resultants. On the basis of this theory the simple and efficient mixed models are developed. The elemental arrays are derived using the Hu–Washizu mixed variational principle. Numerical results are presented to demonstrate the high accuracy and effectiveness of the developed 4‐node shell elements and to compare their performance with other finite elements reported in the literature. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   
6.
季广森  刘学超 《物探装备》2002,12(3):188-189
本文着重介绍了可控震源的防寒问题以及在复杂地区作业的施工方法.  相似文献   
7.
A continuum-based modeling of coupled electrostatics-structure interactions is presented for the frequency computations of MEMS devices. The present general formulation of electrostatics accounting for free space is validated first by specializing it to one-dimensional uniform motion of conducting surfaces and comparing the resulting electrostatics to conventional lumped models. The general coupled electrostatics-structure interactions are then applied for the prediction of resonant frequencies of MEMS devices due to bias-voltage changes and temperature variations. Comparisons of predicted resonant frequencies obtained by the present coupled electrostatics-structure interaction models with experimental results available in the literature demonstrate that the proposed continuum-based interaction modeling yields high-confidence predictions of resonant frequencies of MEMS devices.  相似文献   
8.
This letter presents a novel approach for organizing computational resources into groups within H.264/AVC motion estimation architectures, leading to reductions of up to 75% in the equivalent gate count with respect to state‐of‐the‐art designs.  相似文献   
9.
Why are human observers particularly sensitive to human movement? Seven experiments examined the roles of visual experience and motor processes in human movement perception by comparing visual sensitivities to point-light displays of familiar, unusual, and impossible gaits across gait-speed and identity discrimination tasks. In both tasks, visual sensitivity to physically possible gaits was superior to visual sensitivity to physically impossible gaits, supporting perception-action coupling theories of human movement perception. Visual experience influenced walker-identity perception but not gait-speed discrimination. Thus, both motor experience and visual experience define visual sensitivity to human movement. An ecological perspective can be used to define the conditions necessary for experience-dependent sensitivity to human movement. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
10.
非线性隔振理论初探   总被引:17,自引:2,他引:15  
彭献  唐驾时 《振动与冲击》1996,15(4):13-17,36
本文以线必阻尼,立方刚度非线性系统为例,对非线性隔振理论进行了初步探讨,导出了系统的无量纲运动响应和传递率,并与线性隔振系统进行了比较,着重讨论了非线性对它们的影响,获得了一些有用的结论。  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