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   17610篇
  免费   2226篇
  国内免费   1573篇
电工技术   1464篇
综合类   1747篇
化学工业   2637篇
金属工艺   522篇
机械仪表   857篇
建筑科学   1154篇
矿业工程   416篇
能源动力   383篇
轻工业   2185篇
水利工程   650篇
石油天然气   1149篇
武器工业   527篇
无线电   1184篇
一般工业技术   2287篇
冶金工业   1106篇
原子能技术   248篇
自动化技术   2893篇
  2024年   139篇
  2023年   340篇
  2022年   617篇
  2021年   745篇
  2020年   951篇
  2019年   732篇
  2018年   675篇
  2017年   807篇
  2016年   849篇
  2015年   837篇
  2014年   1151篇
  2013年   1376篇
  2012年   1289篇
  2011年   1290篇
  2010年   933篇
  2009年   983篇
  2008年   878篇
  2007年   1101篇
  2006年   971篇
  2005年   866篇
  2004年   682篇
  2003年   583篇
  2002年   500篇
  2001年   373篇
  2000年   332篇
  1999年   239篇
  1998年   183篇
  1997年   156篇
  1996年   145篇
  1995年   116篇
  1994年   94篇
  1993年   90篇
  1992年   79篇
  1991年   56篇
  1990年   46篇
  1989年   33篇
  1988年   12篇
  1987年   18篇
  1986年   14篇
  1985年   20篇
  1984年   20篇
  1983年   16篇
  1982年   15篇
  1981年   5篇
  1980年   5篇
  1979年   8篇
  1971年   3篇
  1963年   3篇
  1959年   6篇
  1957年   4篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
Fusion of multi-sensor information is an important technology, which is growing exponentially due to its tremendous application potential in many areas. Effective fusion of data from sensors is very critical in increasing an intelligent system's capability to accomplish complex tasks. Appropriate fusion technologies are needed to be developed specially when a system requires redundant sensors to be used. More the redundancy in sensors, more is the computational complexity for controlling the system and more is its intelligence level. This research presents a strategy developed for multiple sensor fusion, based on geometric optimization. Each sensor's uncertainty has been modeled using classical Lagrangian optimization techniques. However, the uniqueness and effectiveness of the present technique lies on the fact that starting from the optimized value as initial estimate the accuracy of the sensory information has further been improved up to any pre defined bounded range, by developing two architectures – FFA (fission–fusion architecture) and FDD (fusion in differential domain). Sufficient evidences and analyses have been provided in the paper to show its effectiveness in various applications.  相似文献   
32.
The effects of amounts of gelatinized starch and moisture in the final slurry or dough, cooking time, holding time, and holding temperature on physical properties of mungbean noodles were studied. Cooking loss, cutting stress, work to cut, and transparency of noodles were measured. Moisture content of the final slurry or dough, cooking time, and holding temperature were the most important factors that affected physical properties of mungbean noodles. Processing should be done at moisture contents not exceeding 55%, cooking times not longer than 40 set, and holding temperatures not lower than 3° using 5% of total starch as gelatinized starch and holding time of 36 hr.  相似文献   
33.
龚欣  马琳  张晓菊  张金凤  杨燕  郝跃 《半导体学报》2006,27(9):1600-1603
基于实验数据对GaN材料的少子寿命和碰撞电离率进行了建模,应用漂移-扩散传输模型开展了npnAlGaN/GaN异质结双极晶体管的特性研究,给出了器件导通电压、偏移电压和饱和电压的解析式.结果表明:实际器件导通电压、偏移电压及饱和电压较大的原因主要是高基区电阻和基区接触的非欧姆特性,为器件的工艺制造提供了理论指导.  相似文献   
34.
FAFFA加速的PO-MM研究复杂金属载体上线天线电磁特性   总被引:3,自引:0,他引:3       下载免费PDF全文
华夷和  徐金平  牛臻弋 《电子学报》2003,31(Z1):2045-2049
本文提出了一种快速远场近似(FAFFA)加速的混合物理光学矩量法(POMM),利用FAFFA加速计算矩阵方程中的矩阵矢量积,明显提高了计算效率.对物体表面上的远场组之间的耦合作用推导出了一组简洁的计算公式,并分析了计算复杂度.复杂金属组合体上线天线输入导纳、互导纳和方向性图的计算结果与文献结果一致.利用该方法分析计算了一个舰船模型上线天线的电磁特性.数值结果表明了这种方法的正确性和工程应用中的有效性.  相似文献   
35.
The current study examined psychological and physical health outcomes of the written disclosure paradigm and the hypothesis that the principles of therapeutic exposure account for the beneficial effects of the paradigm. Participants were randomly assigned to either a written disclosure condition or a control condition. Reactivity to the writing sessions was examined using both subjective and physiological measures. Measures of psychological and physical health were completed before and 1 month after the sessions. Participants assigned to the disclosure condition reported fewer psychological and physical symptoms at follow-up compared with control participants, though reductions were clinically significant for only 1 outcome measure. Physiological activation to the 1st disclosure session was associated with reduced psychological symptoms at follow-up for disclosure participants. Subjective reports of emotional responding corresponded with physiological reactivity. Implications of these findings are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
36.
沙河街组是沾化凹陷东部五号桩-长堤地区重要的储油层系,主要目的层段为沙三段和沙二段。沙三段和沙二段主要发育有浊积扇、水下冲积扇和滩坝沉积体系,在浊积扇、水下冲积扇中发育辫状水道、扇中前缘、辫状水道间以及扇根、扇缘等沉积微相类型,其中辫状水道、扇中前缘砂体物性好,原生孔隙及次生孔隙均较发育,辫状水道间以及扇根砂体物性较差。其储集特征主要受岩性、沉积微相、成岩作用等因素控制,结合该地区实际情况,将沙二段、沙三段储集层划分为好、中、差3种类型。图4表1参7  相似文献   
37.
乌江索风营水电站坝址区分布有7个堆积体,其成因有崩塌堆积、蠕变-拉裂-崩解堆积、塌滑堆积及混和堆积等.在勘察过程中采用了地质测绘、钻探、硐探、物探、科研试验等多种勘察方法与手段,在勘察成果基础上对堆积体稳定性进行了分析,并结合对工程的不同影响提出了相应的工程处理措施.  相似文献   
38.
A stochastic model is proposed for a basic mechanism in the formation of uncertainties in physical quantity measurements. __________ Translated from Izmeritel'naya Tekhnika, No. 1, pp. 12–17, January, 2006.  相似文献   
39.
1. Introduction Seismic physical modeling technology is an important method for the research on seismic exploration theory and methods. In seismic physical experiments, the earth, mantle or field site are scaled down to physical models according to the similarity principle, and then the seismic field and its variation are observed in the laboratory for the research work on the theories and methods of the earth structure, earthquake forecasting, energy and mineral resource exploration, and engi…  相似文献   
40.
A theoretical study has been made to optimize the fin geometry of a horizontal finned tube which is to be usedfor condensers that handle the vapor load of a liquid phase change cooling module.Systematic numerical calcu-lations of the vapor to coolant heat transfer have been performed for parametric values of fin height,fin spacing,vertical bundle depth and tubeside heat transfer coefficient.Three dielectric fluids (R-113,FC-72,and FC-87)at atmospheric pressure were selected as the working fluids.For a single tube with optimized fin geometry,theaverage heat flux increased in the order of FC-87,R-113 and FC-72.Both the optimum fin height and optimumfin spacing increased with increasing vertical bundle depth.  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