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   5208篇
  免费   177篇
  国内免费   203篇
电工技术   96篇
综合类   36篇
化学工业   537篇
金属工艺   297篇
机械仪表   73篇
建筑科学   117篇
矿业工程   18篇
能源动力   55篇
轻工业   327篇
水利工程   18篇
石油天然气   332篇
武器工业   13篇
无线电   277篇
一般工业技术   498篇
冶金工业   2396篇
原子能技术   39篇
自动化技术   459篇
  2022年   49篇
  2021年   69篇
  2020年   52篇
  2019年   47篇
  2018年   80篇
  2017年   85篇
  2016年   97篇
  2015年   87篇
  2014年   106篇
  2013年   165篇
  2012年   163篇
  2011年   249篇
  2010年   223篇
  2009年   205篇
  2008年   229篇
  2007年   181篇
  2006年   235篇
  2005年   196篇
  2004年   175篇
  2003年   167篇
  2002年   202篇
  2001年   154篇
  2000年   143篇
  1999年   157篇
  1998年   125篇
  1997年   137篇
  1996年   93篇
  1995年   104篇
  1994年   123篇
  1993年   130篇
  1992年   89篇
  1991年   46篇
  1990年   91篇
  1989年   91篇
  1988年   67篇
  1987年   58篇
  1986年   63篇
  1985年   57篇
  1984年   52篇
  1983年   50篇
  1981年   58篇
  1979年   42篇
  1978年   37篇
  1977年   40篇
  1976年   32篇
  1975年   43篇
  1974年   33篇
  1971年   79篇
  1970年   38篇
  1968年   34篇
排序方式: 共有5588条查询结果,搜索用时 15 毫秒
51.
用粘土熟料、软质粘土及复合结合剂研制的胶结剂,用于马克法铸钢输铝管系统的胶结,其使用性能和使用寿命达到或超过了进口胶结剂的水平。  相似文献   
52.
Provides the biography of Dante Cicchetti and announces that he has received the APA Award for Distinguished Senior Career Contributions to Psychology in the Public Interest (2004) for his seminal role in bridging theory, research, and practice by fostering the emergence and coalescence of the field of developmental psychopathology. A selected bibliography is also provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
53.
Provides the biography of Cortney S. Warren and announces that she has received the APA Psi Chi/APA Edwin B. Newman Graduate Research Award (2004) for an outstanding research paper whose findings examine the potential for ethnicity to protect against body image disturbance by moderating the relationships between awareness and internalization of a thin physical ideal and body dissatisfaction. A selected bibliography is also provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
54.
Presents the citation for Anthony D. Wagner, who received the Award for Distinguished Scientific Early Career Contributions to Psychology (cognition and human learning) "for outstanding and innovative research on the neural basis of memory and executive control." A brief profile and a selected bibliography accompany the citation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
55.
Presents a collection of abstracts from the 2007 Canadian Society for Brain, Behaviour and Cognitive Science (CSBBCS) Annual Meeting. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
56.
33m跨钢管屋架吊装工程由于准备充分、方案科学、组织工作到位 ,在短时间内吊装成功  相似文献   
57.
Seven linseed varieties were harvested at seven times before complete maturity. Microscale oilseed expressions were subsequently carried out on it. A pressure of 10 MPa was applied for 1 h under uniaxial stress. The results were characterized in terms of oil, water and mucilage content, harvest date and oil yield. The piston displacement versus time (creep curves) was described by a four‐Kelvin‐Voigt elements viscoelastic model. Parameters were derived from the model, such as the mechanical properties of seeds (compressibility moduli), showing that the viscoelastic model fits well the experimental data (R² ≈ 0.999). The modeling parameters were combined with some biochemical data in order to predict the kinetics of oil extraction.  相似文献   
58.
59.
使用有限元程序SAP5对某新型导弹发射筒内的适配器的强度进行了计算。通过结果分析,找出了适配器危险应力点的分布规律,它对结构选型设计具有指导意义。  相似文献   
60.
Current sanitation concepts of decentralised wastewater treatment and reuse raise the issue of monitoring and maintenance of such systems. To guarantee high quality of the recycled water, systems with high requirements concerning process technology are essential. With increasing numbers of decentralised treatment systems spread over far distances it will become more and more impossible and uneconomic to have expert personnel on site. Therefore, new visualisation and intelligent information systems are necessary. The paper describes the structure and 3D-demonstrations as a base for information visualisation. Up-to-date visualisation techniques, facilitating the cognition of context-adapted information, make it possible to maximise the amount of information presented to the user without overwhelming her or him. Concerning diagnosis and decision support systems in the domain of wastewater treatment, several interesting approaches are presented, estimating their applicability for decentralised wastewater treatment systems. The intelligent decision support system presented here consists of a combined ontology- and case-based reasoning system in addition to a process monitoring system. It is responsible for plausibility checks, error diagnosis, solution proposals, and optimisation suggestions.  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