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   491篇
  免费   11篇
电工技术   10篇
化学工业   38篇
金属工艺   9篇
机械仪表   14篇
建筑科学   35篇
能源动力   7篇
轻工业   31篇
水利工程   6篇
石油天然气   2篇
无线电   33篇
一般工业技术   64篇
冶金工业   173篇
原子能技术   2篇
自动化技术   78篇
  2023年   3篇
  2021年   4篇
  2020年   6篇
  2019年   4篇
  2018年   4篇
  2017年   6篇
  2016年   4篇
  2015年   4篇
  2014年   6篇
  2013年   18篇
  2012年   12篇
  2011年   29篇
  2010年   12篇
  2009年   18篇
  2008年   27篇
  2007年   17篇
  2006年   14篇
  2005年   10篇
  2004年   16篇
  2003年   11篇
  2002年   6篇
  2001年   8篇
  2000年   5篇
  1999年   11篇
  1998年   49篇
  1997年   23篇
  1996年   19篇
  1995年   18篇
  1994年   12篇
  1993年   11篇
  1992年   5篇
  1991年   6篇
  1990年   4篇
  1989年   6篇
  1988年   4篇
  1987年   4篇
  1986年   3篇
  1985年   5篇
  1984年   5篇
  1983年   5篇
  1982年   4篇
  1981年   11篇
  1980年   4篇
  1979年   3篇
  1978年   5篇
  1977年   5篇
  1976年   9篇
  1975年   3篇
  1973年   6篇
  1972年   3篇
排序方式: 共有502条查询结果,搜索用时 0 毫秒
41.
Patients who express intense, erotic attraction to their analysts pose special treatment challenges that may not respond well to the analyst's interpretive efforts. A detailed case presentation is offered, describing one such patient, who demanded that her analyst convey his interest in her concretely, insisting that he offer her gifts, tell her he loved her, and even engage her sexually. It is argued that such concrete conveyances reflect, in part, the patient's attempt to self- and mutually regulate intense, affect-laden experience. The wish that the analyst demonstrate love for the patient expressed in modulated form her history of deeply painful and frustrated longings, as well as her hope for a different outcome within the treatment relationship. Finally, their spontaneous, shared playfulness evolved into a form of ongoing relatedness that provided the patient significant understanding and acceptance while providing the analyst an appropriate means of responding to the patient's erotic demands. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
42.
COTS software products are increasingly becoming standard components for building integrated information systems. At the same time, the growth of electronic trading, turbulent market conditions, and a project-style approach to business have created a demand for information systems that can be rapidly adapted to changing business process demands. However, the ongoing development of COTS products is unpredictable as their developers and source code are rarely available. Flexible information systems use COTS components because they cost-effectively supply required component functionality. A software architecture can capture a system design as a set of interacting components and capture the role of COTS software in "implementing" certain components.  相似文献   
43.
44.
Reviews the progress of the planning-attention-simultaneous-successive (PASS) theory, described by J. P. Dass (1972, 1973). The theory describes behavior as the result of the interdependent functioning of planning, attention (arousal), and coding (either simultaneous or successive) systems. Most research conducted to 1979 concerned simultaneous and successive coding in working memory and relied on principle components analyses. Research since 1980 has examined the roles of arousal, especially in attention, and of the planning system; experimental studies and confirmatory analyses have also been conducted. Relationships of PASS theory to other theories and approaches are considered. Three areas of application are examined: understanding achievement skills and learning problems, theory-based assessment of cognitive processes, and instructional design. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
45.
The cover image, by Hannah C Wells et al., is based on the Research Article Deer leather: analysis of the microstructure affecting pebble, DOI: 10.1002/jsfa.8199 .

  相似文献   

46.
Recent efforts to model tricalcium silicate based cements assume a two-step hydration mechanism where, in the first step, the empty space between cement particles rapidly fills with a low density calcium silicate hydrate (C-S-H) and in the second step, the thus formed C-S-H densifies slowly. This gives rise to models that nicely mimic the shape of experimentally observed hydration calorimetry curves and explains the transition between Stage 3 (acceleration) and Stage 4 (decreasing rate) hydration as well as post Stage 4 continued slow reaction. If this mechanism is correct, however, one would expect that the amount of heat energy released should increase with available space between particles, i.e. with water-to-cement ratio. A series of experiments, wherein the water-to-cement ratio was systematically varied showed little or no increase in total heat released when the water-to-cement ratio was doubled or tripled suggesting that the two-step mechanism may need revision.  相似文献   
47.
A new laser transfer process is reported which allows damage-free transfer of ferroelectric thin films from a growth substrate directly to a target substrate. The thin film ferroelectric material is deposited on a fused silica growth substrate with a sacrificial release layer of ITO (indium tin oxide). Regions of the film that are to be transferred are then selectively metallised, and bonded to the target substrate. Separation from the growth substrate is achieved by laser ablation of the ITO release layer by a single pulse from a KrF excimer laser, with the laser light being incident through the growth substrate. The residual ITO on the transferred ferroelectric layer is electrically conducting, and may be suitable for incorporation into the final device, depending on the application. The new process has been demonstrated for 500 nm-thick layers of sol-gel PZT which were thermosonically bonded to a silicon target substrate prior to laser release. The transferred films show ferroelectric behaviour and have a slightly reduced permittivity compared to the as-deposited material.  相似文献   
48.
Perceptions of tourism held by a sample of New Zealand's Antarctic community are explored, and the small, mixed group of scientists and support workers that populate Scott Base (New Zealand's research base in the Ross Dependency, Antarctica) are treated as proxy for a ‘host’ community. This exploration is part of a wider study that set out to investigate the nature and meanings of Antarctic heritage. Although the research did not explicitly set out to survey perceptions of tourism, approximately one-half of those interviewed in the wider study gave an insight into this topic. The qualitative data reported were gathered during two visits to Scott Base in 1999. From the responses a three-fold classification was derived, indicating degrees of tolerance toward tourism: cautious, complex and comfortable tolerance.  相似文献   
49.
The preliminary results of a project that is currently investigating the nature and range of meanings of Antarctic heritage are explored. The project involves two visits to Scott Base, and the subjects of the qualitative research are the members of the New Zealand Antarctic community. Work so far suggests that different meanings do exist, and a four-fold typology of meanings is suggested which needs to be considered in decisions affecting the future of Antarctica.  相似文献   
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