全文获取类型
收费全文 | 32227篇 |
免费 | 3220篇 |
国内免费 | 1620篇 |
专业分类
电工技术 | 5057篇 |
技术理论 | 2篇 |
综合类 | 2259篇 |
化学工业 | 1445篇 |
金属工艺 | 747篇 |
机械仪表 | 2502篇 |
建筑科学 | 3952篇 |
矿业工程 | 2696篇 |
能源动力 | 881篇 |
轻工业 | 777篇 |
水利工程 | 3094篇 |
石油天然气 | 900篇 |
武器工业 | 151篇 |
无线电 | 2915篇 |
一般工业技术 | 1650篇 |
冶金工业 | 865篇 |
原子能技术 | 495篇 |
自动化技术 | 6679篇 |
出版年
2024年 | 130篇 |
2023年 | 422篇 |
2022年 | 953篇 |
2021年 | 1147篇 |
2020年 | 1158篇 |
2019年 | 772篇 |
2018年 | 760篇 |
2017年 | 1021篇 |
2016年 | 1260篇 |
2015年 | 1482篇 |
2014年 | 2619篇 |
2013年 | 2244篇 |
2012年 | 3213篇 |
2011年 | 3075篇 |
2010年 | 2027篇 |
2009年 | 1934篇 |
2008年 | 1753篇 |
2007年 | 1970篇 |
2006年 | 1723篇 |
2005年 | 1532篇 |
2004年 | 1318篇 |
2003年 | 1056篇 |
2002年 | 812篇 |
2001年 | 592篇 |
2000年 | 491篇 |
1999年 | 358篇 |
1998年 | 275篇 |
1997年 | 223篇 |
1996年 | 177篇 |
1995年 | 139篇 |
1994年 | 102篇 |
1993年 | 62篇 |
1992年 | 40篇 |
1991年 | 43篇 |
1990年 | 28篇 |
1989年 | 29篇 |
1988年 | 21篇 |
1987年 | 6篇 |
1986年 | 13篇 |
1985年 | 11篇 |
1984年 | 7篇 |
1983年 | 11篇 |
1982年 | 10篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1977年 | 3篇 |
1964年 | 5篇 |
1963年 | 3篇 |
1957年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Burle Borís; Allain Sonia; Vidal Franck; Hasbroucq Thierry 《Canadian Metallurgical Quarterly》2005,31(4):831
Although it is widely accepted that control mechanisms are necessary for human behavior to be adapted, very little is known about how such mechanisms are recruited. A suggestion to fill the gap was put forward by M. M. Botvinick, T. S. Braver, C. S. Carter, D. M. Barch, and J. D. Cohen (2001), who proposed the conflict-loop theory. This theory has been successful in accounting for the reduction of compatibility effects after an incompatible trial: The level of conflict being, on average, higher during an incompatible trial, more control occurs after such a trial. The authors have tested this prediction by sorting the trials on the basis of amount of conflict (quantified by the electromyographic activity) they presented. A reduction of the compatibility effect was observed after incompatible trials, but it was independent of the level of conflict on previous trials, suggesting that the conflict does not trigger changes in executive control. Consequences for the conflict monitoring model are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
102.
Neutral Beam Injection control system (NBICS) is constructed to measure the plasma current, Magnet current, vacuum pressure, cryopump temperature, control water cooling, filament voltage, and power supply, etc. The NBICS, consisting mainly of a Programmable Logic Controller (PLC) subsystem, data acquisition and processing subsystem and cryopump and vacuum pressure monitoring subsystem, has successfully been used on a NBI device. In this article, the design of NBICS on HT-7 is discussed and each subsystem is described in particular.In addition, some experimental results are reported which are very important data for further research related to the HT-7 tokamak. 相似文献
103.
The investigation and application of on-line monitoring programs has been ongoing for over two decades by the U.S. nuclear industry and researchers. To this date, only limited pilot installations have been demonstrated and the original objectives have changed significantly. Much of the early work centered on safety critical sensor calibration monitoring and reduction. The current focus is on both sensor and equipment monitoring. This paper presents the major lessons learned that contributed to the lengthy development process including model development and implementation issues, and the results of a recently completed cost benefit analysis. 相似文献
104.
J. Pohlus 《Progress in Nuclear Energy》2003,43(1-4):27-34
The nuclear reactor core design and the nuclear fuel management have been changed remarkable during the last few years. This development was initiated by increasing costs for the fuel recycling and nuclear waste storage. The fuel material, the fuel pellet fabrication, the fuel assembly structure and the core composition have been varied to get an effective fuel exploitation. Based on advanced core process conditions the reactor power and the fuel burn-up have been increased at German plants in recent years. Improved dynamic process monitoring procedures are required to get more information about the varied core process behaviour during the reactor operation. Since several years ISTec has been performed investigations to the process monitoring based on process signal measurements in German nuclear power plants. Using the standard instrumentation of the plants process signals have been measured and analysed by means of the digital data acquisition system SIGMA. The measured time signals are influenced by core process transients, global and local process fluctuations and by signal line transfer functions. Advanced time series analysis methods have been applied to separate different process effects in the multiple signal matrix. The separation of different process influences can improve significantly the information about the process condition in the reactor core. 相似文献
105.
文章分析了半导体薄膜生长工艺流程的特点。在此基础上,为实验室的ECR—MOCVD设备设计了一套半导体薄膜生长的实时监控系统,介绍了系统的硬件结构以及在WIN98环境下用VB6.0实现生长实时监控系统软件的实现方法。经实验证明,系统保证了工艺流程的连续可靠运行,实验数据的可靠性和工艺流程的可重复性也大大提高,使用方便,降低了试验人员的劳动强度,实现了预期的设计目标。 相似文献
106.
组态王在电梯监控系统中的应用 总被引:4,自引:2,他引:4
本文介绍了组态王kingview5.1组成的电梯监控和数据采集系统,主要讨论了其设计步骤,调试方法等。 相似文献
107.
RSView32组态软件在火电厂生产调度监控系统中的应用 总被引:3,自引:0,他引:3
主要论述了RSView32组态软件,在火电厂生产调度监控系统中的应用,并介绍了使用高新技术网络采集控制器NETRTU。其配置简捷、高速和可靠,将代表着自动化硬件新的发展趋势,与RSView32组态软件配合使用真可谓绵上添花。 相似文献
108.
109.
110.