全文获取类型
收费全文 | 15329篇 |
免费 | 1824篇 |
国内免费 | 1129篇 |
专业分类
电工技术 | 3004篇 |
技术理论 | 9篇 |
综合类 | 1691篇 |
化学工业 | 670篇 |
金属工艺 | 278篇 |
机械仪表 | 1456篇 |
建筑科学 | 1032篇 |
矿业工程 | 661篇 |
能源动力 | 218篇 |
轻工业 | 358篇 |
水利工程 | 221篇 |
石油天然气 | 290篇 |
武器工业 | 168篇 |
无线电 | 2146篇 |
一般工业技术 | 803篇 |
冶金工业 | 350篇 |
原子能技术 | 19篇 |
自动化技术 | 4908篇 |
出版年
2024年 | 142篇 |
2023年 | 353篇 |
2022年 | 674篇 |
2021年 | 849篇 |
2020年 | 815篇 |
2019年 | 416篇 |
2018年 | 377篇 |
2017年 | 463篇 |
2016年 | 471篇 |
2015年 | 534篇 |
2014年 | 1150篇 |
2013年 | 867篇 |
2012年 | 1307篇 |
2011年 | 1147篇 |
2010年 | 881篇 |
2009年 | 767篇 |
2008年 | 830篇 |
2007年 | 1032篇 |
2006年 | 799篇 |
2005年 | 781篇 |
2004年 | 650篇 |
2003年 | 568篇 |
2002年 | 493篇 |
2001年 | 460篇 |
2000年 | 358篇 |
1999年 | 263篇 |
1998年 | 174篇 |
1997年 | 148篇 |
1996年 | 96篇 |
1995年 | 92篇 |
1994年 | 78篇 |
1993年 | 69篇 |
1992年 | 44篇 |
1991年 | 37篇 |
1990年 | 31篇 |
1989年 | 16篇 |
1988年 | 9篇 |
1987年 | 11篇 |
1986年 | 9篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 5篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
The intelligent controlling and data process of pitch error measurement is proposed. The whole system takes C++ as the development tool and takes advantages of object-oriented and visualization, having the advantages of easy operation and humanistic interface. In the meanwhile, the system can be complemented and improved according to the demand of user, having certain independence. The research of the system provides an efficient and reliable way to measure and analyze the gear pitch, which can be referenced in the future research. 相似文献
24.
This paper presents an electromechanical wheel suspension, where the upper arm of the suspension has been provided with an electric levelling and a damper actuator, both are allowed to work in a fully active mode. A control structure for the proposed suspension is described. The complex design task involving the control of the electric damper and its machine parameters is tackled by genetic optimisation. During this process, these parameters are optimised to keep the power dissipation of the electric damper as low as possible, while maintaining acceptable comfort and road-holding capabilities. The results of the evaluations carried out demonstrate that the proposed suspension can easily adopt its control parameters to obtain a better compromise of performance than that offered by passive suspensions. If the vehicle is to maintain acceptable performance during severe driving conditions, the damper has to be unrealistically large. However, if the electric damper is combined with a hydraulic damper, the size of the electric damper is significantly reduced. In addition, the design of the electric damper with the suggested control structure, including how it regenerates energy, is discussed. 相似文献
25.
本文分析了压缩机过载保护器特性自动测试系统的设计原理与特点,并根据控温要求,针对本系统特点,提出了一种基于控制规则集,采用预估补偿和自适应调整策略的智能控制算法。 相似文献
26.
面向智能计算的记忆结构理论综述 总被引:5,自引:0,他引:5
本文从智能计算角度出发,对记忆的总体结构、信息表征及记忆模型等方面的理论作一综述。并在分析、比较了这些理论与AI中的相关理论差异的基础上,对面向智能计算的记忆理论研究方法与方向作了扼要讨论。 相似文献
27.
N. M. Wereley T. F. Zahrah F. H. Charron 《Journal of Materials Engineering and Performance》1993,2(5):671-682
Intelligent processing of materials (IPM) deals with the integration of process models and in situ sensors into an intelligent
process controller to achieve desired material properties. IPM-based control systems recently have been developed for both
consolidation and solidification processes. This article explores the application of models based on the finite- element method
(FEM) to develop process actuation systems, to design process schedules and component shape, and to develop a control model
with which to control the process.
The results in this article were presented at the AeroMat ’93 Advanced Aerospace Materials/Processes Conference and Exposition,
Anaheim, CA, 7–10 June 1993 相似文献
28.
In process-control system design, the Computer Aided Design (CAD) techniques have evolved a new generation of design techniques. This also paves the way for implementing Computer Integrated Manufacturing Systems (CIMS). However, the key issue to accomplishing the objectives in CAD is the automation of conceptual design. This paper first introduces the fundamentals of conceptual design for process-control system design. Then, a strategy to solve the problems in conceptual design is proposed. The associated system configuration and software implementation platform for developing intelligent systems for process control system design are presented. Finally, an application case is studied. 相似文献
29.
30.
文章简单介绍了INFORMIX关系数据库动态RDSQL语句的使用方法以及利用动态RDSQL语句成功开发的中国建设银行湖南省分行智能帐务调整模块的设计方法。 相似文献