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   346931篇
  免费   27585篇
  国内免费   16930篇
电工技术   20804篇
技术理论   52篇
综合类   42043篇
化学工业   45537篇
金属工艺   11855篇
机械仪表   18388篇
建筑科学   43368篇
矿业工程   17107篇
能源动力   11610篇
轻工业   27352篇
水利工程   15318篇
石油天然气   30899篇
武器工业   2992篇
无线电   20867篇
一般工业技术   22352篇
冶金工业   18589篇
原子能技术   3241篇
自动化技术   39072篇
  2024年   1208篇
  2023年   3554篇
  2022年   6768篇
  2021年   8177篇
  2020年   8838篇
  2019年   7790篇
  2018年   7187篇
  2017年   8949篇
  2016年   10374篇
  2015年   11048篇
  2014年   19375篇
  2013年   18433篇
  2012年   23020篇
  2011年   24425篇
  2010年   19066篇
  2009年   19563篇
  2008年   18244篇
  2007年   23724篇
  2006年   22762篇
  2005年   19766篇
  2004年   16865篇
  2003年   15275篇
  2002年   12730篇
  2001年   10811篇
  2000年   9131篇
  1999年   7487篇
  1998年   5725篇
  1997年   5013篇
  1996年   4462篇
  1995年   3766篇
  1994年   3290篇
  1993年   2407篇
  1992年   2157篇
  1991年   1605篇
  1990年   1383篇
  1989年   1176篇
  1988年   921篇
  1987年   659篇
  1986年   479篇
  1985年   530篇
  1984年   612篇
  1983年   534篇
  1982年   430篇
  1981年   456篇
  1980年   255篇
  1979年   147篇
  1978年   95篇
  1977年   84篇
  1976年   70篇
  1975年   73篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
岳飞《满江红》词在中国诗歌史上享誉千古,其豪迈壮烈的艺术张力和悲壮的魅力,震撼并感染了无数国人,铸就了一代代中华儿女的爱国情怀。作为爱国诗篇,其爱国情结与忠君理念相伴共生,今天我们对之作当代审视和解读,应突破狭隘的爱国范畴,将其升华为中华复兴的精神动力。  相似文献   
82.
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   
83.
Safe and Economic Operation of Power Plants – Research Results in the Field of Materials, Design and Maintenance Components of power plants which undergo high temperatures are subjected to complex loading situations. The requirements on the used materials result from the special operation conditions of the plants and have to be adjusted to the steadily growing requirements on higher efficiency of the complete power plant as well as to those of safe and economic operation. The expenses for control and downtimes are directly connected with economic efficiency and availability. However, in case of new procedures or components it is not possible to revert to the existing know‐how. Different failure mechanisms than known before can occur. The same goes for the load situation. Therefore the knowledge base has to be extended to in‐advance or even parallely running scientific examinations that life assessment and maintenance strategies can be applied which guarantee the operational reliability and the efficiency of the plant. The main emphasis of these F&E works has to be put on condition monitoring based on actual operational data, the standard materials’ and component’s behaviour (deformation, damage and failure behaviour) in connection with design of components and the related material laws. In the framework of applied AVIF projects, following problems are handled:. – qualification of materials by determinating parameters related to practise. – optimal design of components by making available material laws and numerical tools. – economic manufacturing of components by qualifying processing methods such as welding. – The results can be transferred to concepts for safe and economic operation of power plants, especially for newly introduced materials for which there is no operational experience available.  相似文献   
84.
龙新良 《煤炭技术》2003,22(2):49-51
总结了实际工作中防突管理的经验和问题 ,探讨了科学理论与具体实际的有机结合与统一 ,采取针对性强的有效措施 ,确保突出矿井的安全生产  相似文献   
85.
Poly(methyl methacrylate) (PMMA) gels with varying amounts of silicone and solvent and constant amounts of crosslinker were prepared by solution free radical crosslinking copolymerization of methyl methacrylate (MMA), ethylene glycol dimethacrylate (EGDM), tetraethoxysilane (TEOS) and vinyltriethoxysilane (VTES) comonomer systems. They were then studied in benzene at a total monomer concentration of 3.5 mol L?1 and 70 °C. The conversion of monomer, volume swelling ratio, weight fraction and gel point were measured as a function of the reaction time, silicone concentration and benzene content up to the onset of macrogelation. Structural characteristics of the gels were examined by using equilibrium swelling in benzene, gel fraction and Fourier‐transform infrared (FTIR) analysis. The morphology of the copolymers was also investigated by SEM. Based on the obtained results, it was concluded that the FTIR data did not have the capacity to show the presence of the VTES or TEOS moiety in these kinds of copolymers. On the other hand, the variation of weight fraction of gel, Wg, and its equilibrium volume swelling ratio in benzene, qv, exhibited the same behaviour as that of MMA/EGDM copolymers. Also, the dilution of the monomer mixture resulted in an increase in the gel point and swelling degree and a decrease in the percent of conversion and gel fraction. Finally, TEOS is not an ideal silicone compound for reaction in the MMA/EGDM copolymerization system, whereas VTES is a suitable silicone comonomer for this system and it has been proved useful. Copyright © 2005 Society of Chemical Industry  相似文献   
86.
In a series of experiments, participants were required to keep track of 1 or 2 working memory (WM) objects, having to update their values in 80% of the trials. Updating cost, defined as the difference between update and non-update trials, was larger when 2 objects were involved compared with when there was only 1 object was involved. This finding was interpreted as evidence that the updating process encompasses both objects in WM, even though only 1 of them is actually updated. This feature of WM updating is limited to objects defined as "updateable," throughout the trial sequence. The results are explained by the need to reprogram the phonological loop when updating or the need for desynchronization followed by resynchronization of WM contents. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
87.
介绍了我院资源开发工程系的历史、现状和前景,指出了面临的问题及摆脱困境的途径。  相似文献   
88.
全文围绕树立和落实科学发展观这一主题 ,研究和探索如何在新时期、新阶段进一步做好国土资源管理工作的新思路、新途径和新方法。提出要进一步加强国土资源宏观管理 ,更好地为甘肃省经济社会的协调、可持续发展提供保障服务。  相似文献   
89.
根据对选煤厂细粒煤样的实验室优化脱水试验、工业试验及分析结果 ,对真空系统、气水分离器和分配头实施了技术改造 ,细粒煤脱水系统的运行状况得到显著改善 :圆盘真空过滤机滤饼水分降到 2 0 %左右 ,脱饼率在 95 %以上 ,每年的直接经济效益可达 30 0多万元  相似文献   
90.
人类聚居环境学对于居住区规划设计的启示   总被引:1,自引:0,他引:1  
高向鹏 《山西建筑》2007,33(18):24-25
以人类聚居环境学的研究方法从若干方面对目前的居住区规划设计进行了一定的探讨,分析规划设计及建设方面目前存在的主要问题,提出以人类聚居环境学为指导的居住区规划设计理念。  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