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   15295篇
  免费   1915篇
  国内免费   941篇
电工技术   644篇
综合类   1576篇
化学工业   241篇
金属工艺   193篇
机械仪表   1037篇
建筑科学   274篇
矿业工程   211篇
能源动力   81篇
轻工业   458篇
水利工程   85篇
石油天然气   98篇
武器工业   118篇
无线电   5394篇
一般工业技术   769篇
冶金工业   70篇
原子能技术   75篇
自动化技术   6827篇
  2025年   98篇
  2024年   283篇
  2023年   300篇
  2022年   401篇
  2021年   512篇
  2020年   569篇
  2019年   440篇
  2018年   421篇
  2017年   587篇
  2016年   607篇
  2015年   678篇
  2014年   1172篇
  2013年   1086篇
  2012年   1069篇
  2011年   1004篇
  2010年   868篇
  2009年   843篇
  2008年   984篇
  2007年   1059篇
  2006年   860篇
  2005年   857篇
  2004年   732篇
  2003年   635篇
  2002年   481篇
  2001年   464篇
  2000年   256篇
  1999年   196篇
  1998年   153篇
  1997年   124篇
  1996年   98篇
  1995年   114篇
  1994年   66篇
  1993年   32篇
  1992年   28篇
  1991年   19篇
  1990年   20篇
  1989年   12篇
  1988年   7篇
  1987年   9篇
  1986年   1篇
  1985年   3篇
  1984年   1篇
  1980年   1篇
  1974年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
本文阐述了一种新型的X射线聚束装置─—X射线透镜的聚束原理。给出了透镜的基本设计方法,并对它应用于X射线光刻研究领域的前景作了展望。  相似文献   
2.
In order to investigate the effects of freezing and thawing on the compressibility of fine-grained soils, freezing and thawing tests and subsequent compression tests with fine-grained soils in an oedometer were carried out. During the freezing, a part of the soils is loosened and another part is over-consolidated under the freezing pressure ?E. The compression curves after the freezing and thaw consolidation are neither different from the normal consolidation curve nor from the rebound curve of an unfrozen soil, until the consolidation pressure ?z = ?E is arrived. Based on the experimental results, a theoretical model has been developed to predict the frost heaves, the thaw-settlements and the compressive deformations of fine-grained soils after the thaw consolidation. The theoretical results are very close to the experimental results.  相似文献   
3.
As the use of smartphones become popular,people heavily depend on smartphone applications to deal with their social activities.For this reason,traditional message texting between mobile applications does not fulfill the versatile requirements of social networking.Many mobile applications use multimodality to deliver multimedia messages including sticker,voice and photo message,video call,and snap movie to enhance the communicative capability.However,without face-to-face interaction,people may fail to detect the other side’s non-verbal social behavior such as fine-grain facial expressions,body movements,or hand gesture.During social interaction,non-verbal behavior conveys information about the involved individuals and help the speakers express their social emotion in an implicit way.It is so important for real-world face-to-face interaction but is often blocked on the mobile telephony.To cope with this problem,we propose an afective computing model to assist the representation of social emotion and then help the progress of social interaction on the mobile telephony.In this model,for the purpose of real-time afective analysis,we delegate the computing loading to the cloud side service and enhance the system’s scalability and availability.The result of this experiment approves the feasibility of our system design for the applications of social intelligent.Also,the system provides a research framework of the social intelligent system on the mobile telephony.  相似文献   
4.
Vehicle Teleoperation Interfaces   总被引:1,自引:1,他引:0  
Despite advances in autonomy, there will always be a need for human involvement in vehicle teleoperation. In particular, tasks such as exploration, reconnaissance and surveillance will continue to require human supervision, if not guidance and direct control. Thus, it is critical that the operator interface be as efficient and as capable as possible. In this paper, we provide an overview of vehicle teleoperation and present a summary of interfaces currently in use.  相似文献   
5.
蒲石河工程下水库大坝顶部混凝土护栏位于坝顶临空边沿,钢筋绑扎和模板支立作业难度大,施工时存在安全隐患。为此,蒲石河工程设计了移动台车栏板辅助浇筑系统并成功应用。实践表明,作业台车设计可靠、安全稳定、操作简便、定位准确、移动方便,保障了施工人员人身安全,节约了成本,加快了工期,提高了模板支立质量,值得类似工程借鉴并推广使用。  相似文献   
6.
A new positioning method in mobile networks is presented. Based on the data fusion technology, it processes multi-layer information fusion for the location estimates achieved by the Chan algorithm, which increases mobile positioning accuracy effectively by only using measured difference of arriving (TDOA) signals. The method is simple and practical, especially when the location estimates are corrupted by the non-line-of-sight (NLOS) error. It not only has high positioning accuracy, but also reduces the location failure probability. Results from computer simulation show that the proposed method is effective in various environments. __________ Translated from Journal of Dalian University of Technology, 2005, 45(1): 138–141 (in Chinese)  相似文献   
7.
详细叙述了终端的音频指标要求和测试调试方法,之后基于Infineon平台的一个实际项目中,论述了如何测试和配置控制数据全过程,使读者能够全面了解GSM手机音频方面的技术标准和电路调试过程.  相似文献   
8.
传统的用软盘收集信息的方法存在一些不足之处,本文介绍了移动代理技术,给出了用移动代理技术来实现信息收集的方法,对该方法进行了安全性分析,并说明了该方法的优点。  相似文献   
9.
A method of determining the orientation of the axes of a three-component magnetometer sensor with respect to the axes of the navigation system of a ferromagnetic mobile object is considered, which eliminates the effect of the magnetization of the object on the determination of the angular position of the axes of the sensor with respect to the axes of the navigation system.  相似文献   
10.
The question of developing measurement provisions for the parameters of petroleum products is considered. The main technical features of a KLAN-1 mobile laboratory unit for analyzing petroleum products intended for rapid analysis of fuel and lubricating materials in storage and on sale are provided.  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