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   1503347篇
  免费   27339篇
  国内免费   7039篇
电工技术   34461篇
综合类   6523篇
化学工业   269281篇
金属工艺   64783篇
机械仪表   43221篇
建筑科学   46375篇
矿业工程   11470篇
能源动力   50276篇
轻工业   114672篇
水利工程   15105篇
石油天然气   37764篇
武器工业   154篇
无线电   196568篇
一般工业技术   284950篇
冶金工业   158470篇
原子能技术   34089篇
自动化技术   169563篇
  2021年   15412篇
  2019年   14571篇
  2018年   15773篇
  2017年   15160篇
  2016年   21302篇
  2015年   17318篇
  2014年   28656篇
  2013年   87731篇
  2012年   35521篇
  2011年   48266篇
  2010年   42728篇
  2009年   51124篇
  2008年   45048篇
  2007年   42413篇
  2006年   44941篇
  2005年   39780篇
  2004年   41901篇
  2003年   41773篇
  2002年   40865篇
  2001年   37455篇
  2000年   35909篇
  1999年   34693篇
  1998年   42655篇
  1997年   37783篇
  1996年   34567篇
  1995年   30423篇
  1994年   28500篇
  1993年   28236篇
  1992年   26240篇
  1991年   23302篇
  1990年   23730篇
  1989年   22755篇
  1988年   21270篇
  1987年   19562篇
  1986年   18954篇
  1985年   22323篇
  1984年   22479篇
  1983年   20411篇
  1982年   19333篇
  1981年   19399篇
  1980年   18065篇
  1979年   18676篇
  1978年   17877篇
  1977年   17767篇
  1976年   18978篇
  1975年   16109篇
  1974年   15646篇
  1973年   15734篇
  1972年   13214篇
  1971年   11861篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
211.
Journal of Communications Technology and Electronics - Abstract—The two-dimensional diffraction problem of a plane polarized TM-wave on two identical solid silver nanocylinders is considered....  相似文献   
212.
Wireless Personal Communications - The rapid development of Information and Communication Technology and the growing number of devices connected to the Internet make the Internet of Things (IoT) as...  相似文献   
213.
Metallurgical and Materials Transactions B - The process of obtaining titanium tetrachloride (TiCl4) from the quartz-leucoxene concentrate (QLC) from the Yaregskoe oil-titanium field was studied....  相似文献   
214.
Hassan  Lovelu  Khan  K. A. 《Microsystem Technologies》2020,26(3):1031-1041

The efficiency of any electric cell or battery is very important. To keep it in mind it has been studied the columbic efficiency, voltaic efficiency and energy efficiency of a PKL (Pathor Kuchi Leaf) Quasi Voltaic Cell or Modified Voltaic Cell. It was found that the columbic efficiency data illustrated that this efficiency was lower comparing to other efficiencies may be the absence of salt bridge or separator between the electrodes. Because, our designed and fabricated PKL cell does not have any salt bridge. So that the internal resistance is lower than the traditional voltaic cell and as a result more current was found. The voltage and current changes with time and I–V characteristics for PKL unit cell, module, panel and array have also been studied. It is shown that the voltaic and energy efficiency have been studied. However, the highest efficiency was obtained for 40% PKL sap with 5% secondary salt in 55% aqueous solution, which implies that the concentration of PKL juice can play an important role regarding efficiency. It was also found that the average energy efficiency was 97.43% and it was also found that the average voltaic efficiency was 57.29%. Finally, morphological study FESEM (Field Emission Scanning Electron Microscopy) has also been performed. It is seen that the results confirmed that Zn was deposited on the Cu surface during the electro deposition process in PKL solution. Using AAS, it has been measured the concentration of [Cu2+] as a reactant ion and the concentration of [Zn2+] as a product ion those have been tabulated and graphically discussed. The variation of pH has also been studied with time and which was also tabulated and graphically discussed.

  相似文献   
215.
The use of field robots can greatly decrease the amount of time, effort, and associated risk compared to if human workers were to carryout certain tasks such as disaster response. However, transportability and reliability remain two main issues for most current robot systems. To address the issue of transportability, we have developed a lightweight modularizable platform named AeroArm. To address the issue of reliability, we utilize a multimodal sensing approach, combining the use of multiple sensors and sensor types, and the use of different detection algorithms, as well as active continuous closed‐loop feedback to accurately estimate the state of the robot with respect to the environment. We used Challenge 2 of the 2017 Mohammed Bin Zayed International Robotics Competition as an example outdoor manipulation task, demonstrating the capabilities of our robot system and approach in achieving reliable performance in the fields, and ranked fifth place internationally in the competition.  相似文献   
216.
217.
218.
219.
220.
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