全文获取类型
收费全文 | 1440篇 |
免费 | 191篇 |
国内免费 | 170篇 |
专业分类
电工技术 | 165篇 |
综合类 | 178篇 |
化学工业 | 26篇 |
金属工艺 | 26篇 |
机械仪表 | 272篇 |
建筑科学 | 17篇 |
矿业工程 | 15篇 |
能源动力 | 11篇 |
轻工业 | 9篇 |
水利工程 | 11篇 |
石油天然气 | 38篇 |
武器工业 | 19篇 |
无线电 | 143篇 |
一般工业技术 | 45篇 |
冶金工业 | 25篇 |
原子能技术 | 11篇 |
自动化技术 | 790篇 |
出版年
2024年 | 5篇 |
2023年 | 35篇 |
2022年 | 35篇 |
2021年 | 38篇 |
2020年 | 48篇 |
2019年 | 33篇 |
2018年 | 43篇 |
2017年 | 50篇 |
2016年 | 56篇 |
2015年 | 73篇 |
2014年 | 93篇 |
2013年 | 85篇 |
2012年 | 112篇 |
2011年 | 116篇 |
2010年 | 68篇 |
2009年 | 74篇 |
2008年 | 89篇 |
2007年 | 93篇 |
2006年 | 92篇 |
2005年 | 82篇 |
2004年 | 69篇 |
2003年 | 53篇 |
2002年 | 55篇 |
2001年 | 53篇 |
2000年 | 51篇 |
1999年 | 39篇 |
1998年 | 24篇 |
1997年 | 24篇 |
1996年 | 18篇 |
1995年 | 18篇 |
1994年 | 11篇 |
1993年 | 12篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 7篇 |
1989年 | 13篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有1801条查询结果,搜索用时 203 毫秒
1.
2.
Christos Bouras Agisilaos Konidaris 《International Journal of Communication Systems》2005,18(2):119-142
Redundant data transfers over the Web, can be mainly attributed to the repeated transfers of unchanged data. Web caches and Web proxies are some of the solutions that have been proposed, to deal with the issue of redundant data transfers. In this paper we focus on the efficient estimation and reduction of redundant data transfers over the Web. We first prove that a vast amount of redundant data is transferred in Web pages that are considered to carry fresh data. We show this by following an approach based on Web page fragmentation and manipulation. Web pages are broken down to fragments, based on specific criteria. We then deal with these fragments as independent constructors of the Web page and study their change patterns independently and in the context of the whole Web page. After the fragmentation process, we propose solutions for dealing with redundant data transfers. This paper has been based on our previous work on ‘Web Components’ but also on related work by other researchers. It utilises a proxy based, client/server architecture, and imposes changes to the algorithms executed on the Proxy server and on clients. We show that our proposed solution can considerably reduce the amount of redundant data transferred on the Web. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
3.
4.
Erick García-Benitez Stephen Yurkovich Kevin M. Passino 《Journal of Intelligent and Robotic Systems》1993,7(2):195-213
In this paper, we propose a two level hierarchical control strategy to achieve accurate end-point position of a planar two-link flexible manipulator. The upper level consists of a feedforward rule-based supervisory controller that incorporates fuzzy logic, whereas the lower level consists of conventional controllers that combine shaft position-endpoint acceleration feedback for disturbance rejection properties and shaping of the (joint) actuator inputs to minimize the energy transferred to the flexible modes during commanded movements. The effectiveness of this hierarchical control strategy is verified by experimental results for various movements of the links, in various configurations. In particular, we illustrate how the hierarchical intelligent control strategy performs better than conventional control techniques for endpoint position control in the presence of flexure effects. 相似文献
5.
应用现代可靠性理论,从设计、工艺、技术等方面对油田集输系统进行了可靠性探讨,提出了增强系统可靠性的措施。 相似文献
6.
P. I. Stetsyuk 《Cybernetics and Systems Analysis》2006,42(1):54-64
New quadratic models are proposed to improve the upper-bound estimates in the maximum weighted cut problem. They are found
by two original methods for deriving redundant quadratic constraints. A well-known linear model is shown to follow from the
models proposed. Recommendations on how to develop its strengthened analogs are given.
This study is partially sponsored from the grant UM2-2574-KV-03 (CRDF Cooperative Grants Program).
__________
Translated from Kibernetika i Sistemnyi Analiz, No. 1, pp. 63—75, January–February 2006. 相似文献
7.
In target detection tasks, responses are faster when displays have 2 targets (redundant-targets effect; RTE) and slower when they have no targets (nontargets effect; NTE) relative to displays with a single target. The psychological refractory period paradigm was used to localize these effects. In Experiment 1, participants classified tones as high or low and then classified letters as targets or nontargets after a short or long stimulus onset asynchrony (SOA). The magnitudes of the RTE and NTE did not depend on SOA. In Experiment 2, the order of the tasks was reversed, and at short SOAs the RTE and NTE had similar magnitudes for both tone discrimination and target detection responses. These findings suggest that the RTE and NTE arise during response selection. Interactive effects of tone pitch with the number and type of target features were also observed, and these were tentatively interpreted as synesthetic effects. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
9.
10.
Marco A. Arteaga Author Vitae 《Automatica》2003,39(1):67-73
Most adaptive control schemes for rigid robots assume velocities measurements to be available. Although it is possible to measure velocities by using tachometers, this increases costs and the signals delivered may be contaminated with noise. Since the use of encoders allows to read joint position pretty accurately, it is desirable to estimate joint velocities through an observer. This paper presents an adaptive scheme designed in conjunction with a linear observer. Boundedness of the estimated parameters and uniform ultimate boundedness for the tracking and observation errors are guaranteed. Experimental results are included to support the developed theory. 相似文献