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   126474篇
  免费   7107篇
  国内免费   3565篇
电工技术   6209篇
技术理论   7篇
综合类   11066篇
化学工业   9187篇
金属工艺   5274篇
机械仪表   14132篇
建筑科学   28602篇
矿业工程   3908篇
能源动力   2983篇
轻工业   5131篇
水利工程   3626篇
石油天然气   4080篇
武器工业   1438篇
无线电   7738篇
一般工业技术   13325篇
冶金工业   3042篇
原子能技术   660篇
自动化技术   16738篇
  2024年   455篇
  2023年   1243篇
  2022年   2072篇
  2021年   2642篇
  2020年   2918篇
  2019年   2229篇
  2018年   2190篇
  2017年   2792篇
  2016年   3217篇
  2015年   3460篇
  2014年   9078篇
  2013年   7127篇
  2012年   8900篇
  2011年   9545篇
  2010年   8113篇
  2009年   8398篇
  2008年   7528篇
  2007年   9022篇
  2006年   7563篇
  2005年   6667篇
  2004年   5365篇
  2003年   5066篇
  2002年   4030篇
  2001年   3391篇
  2000年   2769篇
  1999年   2168篇
  1998年   1784篇
  1997年   1495篇
  1996年   1265篇
  1995年   993篇
  1994年   810篇
  1993年   562篇
  1992年   442篇
  1991年   374篇
  1990年   236篇
  1989年   240篇
  1988年   184篇
  1987年   138篇
  1986年   82篇
  1985年   94篇
  1984年   122篇
  1983年   81篇
  1982年   92篇
  1981年   33篇
  1980年   35篇
  1979年   28篇
  1978年   13篇
  1977年   11篇
  1959年   12篇
  1951年   7篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
给出了以PCI-I64IOT型I/O卡为核心的硬件接口电路和软件设计思想,详细分析了编程方法。实践表明,利用该系统能完全实现侦察专业的全部训练科目,满足部队和院校训练的需要。  相似文献   
62.
项目教学法对于中高职院校培养学生的实际操作能力十分有效,针对《计算机组装与维护》这门课程,通过项目设置、任务分解、组织完成的形式,激发学生学习的兴趣,提高了学生的实际动手能力,取得较好的教学效果。  相似文献   
63.
本文对几种典型减振器做了一些分析,并根据我国主战坦克的特点提出了一种新的改进设计方案,在文中暂称为“复合作用”式减振器。它既能产生象摩擦减振器的摩擦阻尼,又能具有筒式减振器的小孔节流阻尼效果。两种阻尼的复合作用如调整适当,则对提高悬挂系统对地面情况的变化适应能力,改善车辆行驶平稳性和可靠性有很大的帮助。  相似文献   
64.
Utilizing the existing properties of steel, a modern technological society has been constructed. While there are over 25,000 worldwide equivalent steels based on manipulating the eutectoid transformation, there exist only a handful of commercial nanostructured steel alloys based on manipulating the more complex glass devitrification transformation. Thus, research on nanostructured steels is in its infancy, and many further developments are expected with the demonstrated promise of developing new combinations of superior properties. In this article, seven enabling metallurgical factors are presented that ultimately allow a variety of nanostructured steel products to be produced in an ever-increasing array of industrial processing techniques. Additionally, a case example of the formation of nanostructured steel are given showing how these factors can be harnessed on an industrial scale.  相似文献   
65.
郑银环  张仲甫 《机床与液压》2005,(3):107-108,51
讨论了渐变刚度钢板弹簧的载荷、变形量、刚度和应力的计算,建立了少片渐变刚度钢板弹簧的优化数学模型,利用MATLAB优化工具箱进行优化,并给出了计算实例。  相似文献   
66.
水性聚氨酯材料配方设计技巧   总被引:1,自引:1,他引:1  
介绍了优选法的0.618法和分数法,对其进行改进创新和原理证明,并应用于生产涂料配方设计中。  相似文献   
67.
阐述了设计院拥有技术和开发技术的重要性及获取技术的途径,并详细介绍了设计人员能够开展的技术开发工作。  相似文献   
68.
We present a simple and fast algorithm to test the thermodynamic stability and determine the necessary chemical environment for the production of a multiternary material, relative to competing phases and compounds formed from the constituent elements. If the material is found to be stable, the region of stability, in terms of the constituent elemental chemical potentials, is determined from the intersection points of hypersurfaces in an (n−1)(n1)-dimensional chemical potential space, where nn is the number of atomic species in the material. The input required is the free energy of formation of the material itself, and that of all competing phases. Output consists of the result of the test of stability, the intersection points in the chemical potential space and the competing phase to which they relate, and, for two- and three-dimensional spaces, a file which may be used for visualization of the stability region. We specify the use of the program by applying it both to a ternary system and to a quaternary system. The algorithm automates essential analysis of the thermodynamic stability of a material. This analysis consists of a process which is lengthy for ternary materials, and becomes much more complicated when studying materials of four or more constituent elements, which have become of increased interest in recent years for technological applications such as energy harvesting and optoelectronics. The algorithm will therefore be of great benefit to the theoretical and computational study of such materials.  相似文献   
69.
Despite the apparent maturity of the learning design field, and the variety of tooling available to support it, adoption among the teacher community (one of its alleged main targets) is still low. There is a lack of research on teachers' perception and use of different technological learning design tools, as existing evaluations are often restricted to a single tool. In order to explore whether there are common factors hampering teacher adoption, and which tool features might appeal to different teachers, more studies involving multiple authoring tools are needed. This paper provides a first step in this direction, describing a mixed methods study performed around a professional development workshop with 18 university teachers from multiple disciplines. This workshop exposed teachers to two different authoring tools (WebCollage and EDIT2), as they learned to create computer-supported collaborative learning (CSCL) designs and implement them. The findings of our interpretive study (which included questionnaires, observations, or group discussion recordings) support the idea that there is no single tool or set of features that are globally perceived as better, although our evidence also highlights certain factors as important for participant teachers – amongst others, the integration of learning designs with the ICT platforms for enactment, as well as with other tools that they already use in their everyday practice.  相似文献   
70.
Defining appropriate pricing strategy for smart environment is important and complex task at the same time. It holds the primal fraction in Demand Response (DR) program. In our work, we devise an incentive based smart dynamic pricing scheme for consumers facilitating a multi-layered scoring rule. The proposed strategy characterizes both incentive based DR and price based DR programs facilities. This mechanism is applied between consumer agents (CA) to electricity provider agent (EP) and EP to Generation Company (GENCO). Based on the Continuous Ranked Probability Score (CRPS), a hierarchical scoring system is formed among these entities, CA–EP–GENCO. As CA receives the dynamic day-ahead pricing signal from EP, it will schedule the household appliances to lower price period and report the prediction in a form of a probability distribution function to EP. EP, in similar way reports the aggregated demand prediction to GENCO. Finally, GENCO computes the base discount after running a cost-optimization problem. GENCO will reward EP with a fraction of discount based on their prediction accuracy. EP will do the same to CA based on how truthful they were reporting their intentions on device scheduling. The method is tested on real data provided by Ontario Power Company and we show that this scheme is capable to reduce energy consumption and consumers’ payment.  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