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   2138篇
  免费   41篇
  国内免费   7篇
电工技术   36篇
综合类   4篇
化学工业   240篇
金属工艺   36篇
机械仪表   24篇
建筑科学   144篇
矿业工程   3篇
能源动力   63篇
轻工业   186篇
水利工程   21篇
石油天然气   8篇
武器工业   1篇
无线电   153篇
一般工业技术   278篇
冶金工业   565篇
原子能技术   24篇
自动化技术   400篇
  2023年   8篇
  2022年   17篇
  2021年   41篇
  2020年   16篇
  2019年   27篇
  2018年   30篇
  2017年   19篇
  2016年   39篇
  2015年   24篇
  2014年   42篇
  2013年   137篇
  2012年   98篇
  2011年   115篇
  2010年   93篇
  2009年   91篇
  2008年   87篇
  2007年   102篇
  2006年   90篇
  2005年   57篇
  2004年   52篇
  2003年   64篇
  2002年   62篇
  2001年   44篇
  2000年   34篇
  1999年   47篇
  1998年   136篇
  1997年   88篇
  1996年   73篇
  1995年   52篇
  1994年   50篇
  1993年   46篇
  1992年   21篇
  1991年   19篇
  1990年   21篇
  1989年   16篇
  1988年   21篇
  1987年   15篇
  1986年   16篇
  1985年   16篇
  1984年   10篇
  1983年   7篇
  1982年   13篇
  1981年   18篇
  1980年   7篇
  1979年   8篇
  1977年   18篇
  1976年   23篇
  1974年   8篇
  1971年   6篇
  1969年   6篇
排序方式: 共有2186条查询结果,搜索用时 0 毫秒
11.
12.
Examined V. Axlines's book, Play Therapy (1947) which includes 8 basic principles on non-directive play therapy. Student responses to learning these principles in play therapy classes were also examined. Each student was assigned a play therapy client and was observed and assisted directly by the instructor, a licensed clinical psychologist. Clients were mildly trouble children (aged 5–10 yrs) and were selected from a referral base by the instructor as appropriate for the course. As the semester progressed and students gained direct experience, weekly small (3–4 student) group discussions were held to explore in-depth understanding of play therapy principles and how these principles are put into practice. It is concluded that Axline's book remains a classic text and a foremost resource in the field. Coupling it with experiential learning is an invaluable basis for teaching play therapy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
13.
14.
15.
This paper outlines a philosophical and psycho-physiological basis for embodied perception, and develops a framework for conceptual embodiment of vision-guided robots. We argue that categorisation is important in all stages of robot vision. Further, that classical computer vision is unsuitable for this categorisation, however, through conceptual embodiment, active perception can be effective. We present a methodology for developing vision-guided robots that applies embodiment, explicitly and implicitly, in categorising visual data to facilitate efficient perception and action. Finally, we present systems developed using this methodology, and demonstrate that embodied categorisation can make algorithms more efficient and robust.  相似文献   
16.
Fuzzy Cognitive Map (FCM) technique is a combination of Fuzzy Logic and Artificial Neural Networks that is extensively used by experts and scientists of a diversity of disciplines, for strategic planning, decision making and predictions. A standardized representation of FCMs accompanied by a system that would assist decision makers to simulate their own developed Fuzzy Cognitive Maps would be highly appreciated by them, and would help the dissemination of FCMs. In this paper, (a) a RuleML representation of FCM is proposed and (b) a system is designed and implemented in Prolog programming language to assist experts to simulate their own FCMs. This system returns results in valid RuleML syntax, making them readily available to other cooperative systems. The representation capabilities and the design choices of the implemented system are discussed and a variety of examples are given to demonstrate the use of the system.  相似文献   
17.
ABSTRACT

This article examines the phenomenon of Virtual Interpersonal Touch (VIT), people touching one another via force-feedback haptic devices. As collaborative virtual environments become utilized more effectively, it is only natural that interactants will have the ability to touch one another. In the work presented here, we used relatively basic devices to begin to explore the expression of emotion through VIT. In Experiment 1, participants utilized a 2 DOF force-feedback joystick to express seven emotions. We examined various dimensions of the forces generated and subjective ratings of the difficulty of expressing those emotions. In Experiment 2, a separate group of participants attempted to recognize the recordings of emotions generated in Experiment 1. In Experiment 3, pairs of participants attempted to communicate the seven emotions using physical handshakes. Results indicated that humans were above chance when recognizing emotions via VIT but not as accurate as people expressing emotions through nonmediated handshakes. We discuss a theoretical framework for understanding emotions expressed through touch as well as the implications of the current findings for the utilization of VIT in human-computer interaction.  相似文献   
18.
This study evaluated the significance of different process parameters (press temperature, closing time, holding time, moisture content and compression ratio) on solid wood surface densification and its effect on the density profile generated in Scots pine sapwood. Changes in the microstructure of the wood were also evaluated microscopically. The results showed that with a shorter closing time, densification occurred closer to the sample surface than with an extended closing time. At a compression temperature of 150 °C, the vertical density profile exhibited a sharp peak in density that was close to the wood surface. A higher temperature of 200 °C resulted in a slightly broader density peak that was less intense and further from the surface. A holding time of 10 min resulted in the wood compressing to a slightly greater extent than when using a holding time of 1 min. Higher moisture content led to more extensive deformation. The results indicate that surface modification by densification is a viable method of enhancing wood properties.  相似文献   
19.
20.
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