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   24430篇
  免费   557篇
  国内免费   124篇
电工技术   793篇
综合类   106篇
化学工业   4244篇
金属工艺   1337篇
机械仪表   1704篇
建筑科学   487篇
矿业工程   314篇
能源动力   264篇
轻工业   951篇
水利工程   405篇
石油天然气   862篇
武器工业   11篇
无线电   2418篇
一般工业技术   5789篇
冶金工业   2190篇
原子能技术   460篇
自动化技术   2776篇
  2023年   121篇
  2022年   522篇
  2021年   729篇
  2020年   481篇
  2019年   638篇
  2018年   1262篇
  2017年   1300篇
  2016年   1568篇
  2015年   932篇
  2014年   1337篇
  2013年   1803篇
  2012年   1600篇
  2011年   1482篇
  2010年   1414篇
  2009年   1614篇
  2008年   1502篇
  2007年   1377篇
  2006年   1132篇
  2005年   710篇
  2004年   446篇
  2003年   242篇
  2002年   243篇
  2001年   198篇
  2000年   493篇
  1999年   387篇
  1998年   392篇
  1997年   389篇
  1996年   88篇
  1995年   45篇
  1994年   37篇
  1993年   34篇
  1992年   29篇
  1991年   24篇
  1990年   30篇
  1989年   17篇
  1988年   15篇
  1985年   25篇
  1984年   28篇
  1983年   23篇
  1982年   16篇
  1981年   19篇
  1980年   30篇
  1979年   20篇
  1978年   29篇
  1977年   20篇
  1976年   27篇
  1975年   15篇
  1974年   15篇
  1969年   24篇
  1968年   15篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
41.
Tests of a prototype model of TUK-84 and the corresponding experimental procedures used at the test center of the All-Russia Research Institute of Technical Physics are described. The results are presented, and it is shown that the prototype withstood the tests. __________ Translated from Atomnaya énergiya, Vol. 100, No. 6, pp. 441–445, June, 2006.  相似文献   
42.
Methods for cleaning commercial T-1500 dielectric oil with different adsorbents are studied. The oil is intended for impregnation of high-voltage pulse capacitors with film dielectric.  相似文献   
43.
A study has been made on the effects of loading scheme and conditions restricting macroscopic strain on the work-hardening kinetics and strain accumulation in the solid state in sintering materials with bimodal pore size distributions. Active loading intensifies the reduction in the small pores. The greatest effect comes from combining sintering with hydrostatic compression. At the same time, kinematic constraints (partial or complete adhesion in surfaces) substantially retards the shrinkage of large pores, which means that the porous structure can be controlled. __________ Translated from Poroshkovaya Metallurgiya, Nos. 5–6(449), pp. 10–15, May–June, 2006.  相似文献   
44.
A theoretical method for determining the percolation limit and effective conductivity of composites based on polydisperse mixtures of insulator and conductor powders is proposed. The effect of the particle size ratio between the insulator and conductor on the percolation limit and effective conductivity is studied. Numerical simulation of the microstructure, effective properties, and percolation limit in composites is discussed. __________ Translated from Poroshkovaya Metallurgiya, Vol. 46, No. 1–2(453), pp. 31–40, 2007.  相似文献   
45.
A new approach to synthesize algorithms for selective control of the observables in quantum mechanical systems in the presence of additional constraints during the whole period of control is proposed. Analytic results of achieving the goal of control under some additional assumptions were obtained. It was demonstrated that the error in achieving the goal of control is proportionate to the error in prescribing the initial state of system and the error in realizing the control action. Numerical results for the problem of selective control for energy of hydrogen molecules (H2) with different isotopes are represented. The proposed algorithms are easy to design.  相似文献   
46.
The results of investigations performed by specialists at Research and Design Institute of Electrical Technology together with other enterprises, institutes, and organizations concerning the formulation of a strategy for the development of nuclear power in Russia in the first half of the 21st century are presented. The individual stages of the work, key assumptions, ideas, and recommendations, on which the strategy is based, the initiatives which the President of the Russian Federation advanced at the millennium summit held at the United Nations, and the international INPRO project initiated by Russia are examined. It is concluded that innovative development and a transition to building as quickly as possible nuclear power objects that meet the requirements and demands of the new century are necessary. __________ Translated from Atomnaya énergiya,Vol. 103, No. 1, pp. 5–15, July, 2007.  相似文献   
47.
48.
49.
50.
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