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   25578篇
  免费   1290篇
  国内免费   304篇
电工技术   752篇
技术理论   1篇
综合类   2589篇
化学工业   707篇
金属工艺   125篇
机械仪表   220篇
建筑科学   18354篇
矿业工程   445篇
能源动力   589篇
轻工业   113篇
水利工程   265篇
石油天然气   137篇
武器工业   43篇
无线电   425篇
一般工业技术   1120篇
冶金工业   275篇
原子能技术   57篇
自动化技术   955篇
  2024年   56篇
  2023年   103篇
  2022年   386篇
  2021年   382篇
  2020年   440篇
  2019年   323篇
  2018年   267篇
  2017年   455篇
  2016年   531篇
  2015年   685篇
  2014年   3132篇
  2013年   1568篇
  2012年   1938篇
  2011年   1967篇
  2010年   1742篇
  2009年   1877篇
  2008年   1641篇
  2007年   1930篇
  2006年   1349篇
  2005年   1220篇
  2004年   987篇
  2003年   819篇
  2002年   658篇
  2001年   624篇
  2000年   469篇
  1999年   431篇
  1998年   290篇
  1997年   212篇
  1996年   176篇
  1995年   116篇
  1994年   85篇
  1993年   87篇
  1992年   56篇
  1991年   39篇
  1990年   26篇
  1989年   12篇
  1988年   10篇
  1987年   18篇
  1986年   8篇
  1985年   14篇
  1984年   7篇
  1983年   8篇
  1982年   3篇
  1981年   1篇
  1980年   20篇
  1979年   2篇
  1975年   1篇
  1954年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
黄晓齐 《节能》2005,(11):32-34
讨论人体新陈代谢发热率及其影响因素;论述节能建筑中舒适的环境温度、空气相对湿度、空气流速以及新鲜空气供给量的最佳值范围;同时考虑皮肤和肺部的显热散热和蒸发潜热散热,建立了传热模型,得出了计算公式。  相似文献   
82.
基于GPS的高层建筑环境激励动态特性研究及应用   总被引:2,自引:0,他引:2  
本文结合重庆大学主教学楼工程实例,对GPS技术在环境激励下的动态特性进行监控的情况进行了分析和论述。研究结果表明,在高层建筑施工中,应用GPS技术进行建筑物环境激励动态特性监控是一种行之有效的方法。  相似文献   
83.
The architects and builders in the past lacked our knowledge concerning fluid dynamics, but they exhibited a deep rooted ability to observe and reflect - thus, different cultures have developed by trial and error. The authors have produced a stimulating analysis which couples the science of fluid dynamics and a sensitive understanding of past cultures. The paper is recommended reading.  相似文献   
84.
高层结构几何非线性分析的QR法   总被引:3,自引:1,他引:2  
秦荣 《工程力学》1996,13(1):8-15
本文利用QR法分析高层建筑结构几何非线性问题,建立了新的计算格式。该法不仅未知量的数目少,精度高,而且输入简单,计算速度快,可以用微机分析复杂问题。  相似文献   
85.
During the winter of 1988/1989, the relationships between the prevalence of work-related health and indoor climate complaints and a number of building, management, workplace and personal characteristics have been investigated in a study in more than 60 office buildings located throughout the Netherlands. To collect the information, a questionnaire was prepared on health and indoor climate complaints and personal and workplace characteristics. A checklist was used to obtain information on building characteristics More than 7000 questionnaires were completed by the regular users of the buildings investigated. The results showed that the prevalence of symptoms was higher in air-conditioned buildings than in naturally or mechanically ventilated buildings. some other variables were also related with most work-related complaints after adjustment for selected management, personal, workplace and job characteristics. These included gender, work satisfaction in general, presence of allergies and/or respiratory symptoms, and personal control over temperature at the workplace. No differences were found in symptom prevalences between buildings with spray and steam humidification. The combination of air-conditioning and humidification did not lead to further increases in the prevalence of complaints as compared to buildings with only airconditioning or only humidification.  相似文献   
86.
就民用建筑设计部门设计图纸质量抽查中出现的问题,进行了剖析并提出了注意事项。  相似文献   
87.
The role of the project manager has traditionally concentrated upon the execution of a project, from conception to completion. The commissioning and operation have been a secondary priority, for good reasons which are discussed in this paper. Nowhere has this been more true than in building construction, despite the fact that a building is a place where there is maximum interaction with people of all types. Some 10% of people worldwide are disabled, which prevents them from using buildings and facilities designed for able-bodied people. All this is changing rapidly. No longer should buildings be designed to be accessible only to the majority, nor should special arrangements be provided as an ‘extra’ for disabled people. Design philosophy is being impelled to provide for all building users. Great impetus was provided by the 1981 International Year of Disabled Persons, designated by the United Nations. In the UK, The Prince of Wales' Advisory Group on Disability and the Access Committee for England are influential and active organizations that are exerting a powerful influence for change. New building regulations are introducing a statutory imperative. The attention of project managers is drawn to what is happening in this area, and it is suggested that in their unique position they can influence the bridging of the gap between designers and building operators, to ensure that buildings can be used by all, and that nothing is overlooked at any stage. Legislation alone cannot solve the problem, and a change in attitude is necessary.  相似文献   
88.
王禄鹏 《钢结构》2002,17(6):19-21
介绍了高层钢结构安装测控的基本方法和工艺流程 ,并对高层钢结构安装中的控制要点和控制方法进行了详细论述。  相似文献   
89.
事实上,许多饭店存在的许多环境问题都是由于饭店的“先天不足”造成的。因此,饭店绿色建筑设计是创建绿色饭店的根本环节。文章对绿色建筑设计的基本原则和内容作了初步的探讨。  相似文献   
90.
Photovoltaic (PV) cells, when integrated within a building facade, offer the possibility of generating electric power and heat for local use or export. This paper reports on a project to investigate the practical operational efficiencies that might be delivered from such facades. The results from laboratory experiments and computer simulations are presented: the former were used to develop an empirical relationship between cell temperature and power output; the latter were undertaken to assess operational efficiencies under a range of climate conditions representative of the UK.  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