全文获取类型
收费全文 | 562篇 |
免费 | 14篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 7篇 |
化学工业 | 127篇 |
金属工艺 | 18篇 |
机械仪表 | 20篇 |
建筑科学 | 5篇 |
能源动力 | 12篇 |
轻工业 | 43篇 |
水利工程 | 2篇 |
石油天然气 | 3篇 |
无线电 | 45篇 |
一般工业技术 | 66篇 |
冶金工业 | 123篇 |
原子能技术 | 17篇 |
自动化技术 | 89篇 |
出版年
2023年 | 9篇 |
2022年 | 15篇 |
2021年 | 10篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 6篇 |
2017年 | 6篇 |
2016年 | 8篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 32篇 |
2012年 | 17篇 |
2011年 | 20篇 |
2010年 | 7篇 |
2009年 | 15篇 |
2008年 | 23篇 |
2007年 | 17篇 |
2006年 | 11篇 |
2005年 | 18篇 |
2004年 | 27篇 |
2003年 | 19篇 |
2002年 | 16篇 |
2001年 | 10篇 |
2000年 | 15篇 |
1999年 | 8篇 |
1998年 | 25篇 |
1997年 | 19篇 |
1996年 | 21篇 |
1995年 | 23篇 |
1994年 | 8篇 |
1993年 | 13篇 |
1992年 | 12篇 |
1991年 | 10篇 |
1990年 | 6篇 |
1989年 | 11篇 |
1988年 | 15篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 12篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1970年 | 2篇 |
1956年 | 1篇 |
排序方式: 共有577条查询结果,搜索用时 15 毫秒
1.
Service composition for generic service graphs 总被引:1,自引:0,他引:1
Service composition is a promising approach to multimedia service provisioning, due to its ability to dynamically produce new multimedia content, and to customize the content for individual client devices. Previous research work has addressed various aspects of service composition such as composibility, QoS-awareness, and load balancing. However, most of the work has focused on applications where data flow from a single source is processed by intermediate services and then delivered to a single destination. In this paper, we address the service composition problem for multimedia services that can be modeled as directed acyclic graphs (DAGs). We formally define the problem and prove its NP hardness. We also design a heuristic algorithm to solve the problem. Our simulation results show that the algorithm is effective at finding low-cost composition solutions, and can trade off computation overhead for better results. When compared with a hop-by-hop approach for service composition, our algorithm can find composition solutions that aress 10% smaller in cost, even when the hop-by-hop approach uses exhaustive searches. 相似文献
2.
Stewart L. Stokes Jr. 《Information Systems Management》1994,11(3):34-40
Mentoring has been around for ages, often masquerading as the management club or the fast track. Among successful business unit managers, mentoring is a well-understood practice, and it's a career development strategy today's IS professional would be wise to consider. 相似文献
3.
Tuan Vo-Dinh Guy Griffin David L. Stokes Alan Wintenberg 《Sensors and actuators. B, Chemical》2003,90(1-3):104-111
We describe a multi-functional biochip (MFB), which uses two different types of bioreceptors, including nucleic acid and antibody probes, on a single platform. The multi-functional capability of the MFB device for biomedical diagnostics is illustrated by measurements of DNA probes specific to gene fragments of Bacillus anthracis and antibody probes targeted to Escherichia coli. Calibration curves for monitoring pathogenic species using antibody probes against E. coli and DNA probes for B. anthracis illustrate the capability of the device for medical diagnostics and for quantitative detection of pathogenic agents. 相似文献
4.
5.
Bryce J. Stokes 《Biomass & bioenergy》1992,2(1-6):131-147
Eight countries collaborated and shared technical information on the harvesting of small trees and forest residues in a three year program. Proceedings and reports from workshops and reviews are summarized in a review of activities and harvesting systems of the participating countries. Four databases were developed for harvesting and transportation of these materials. 相似文献
6.
7.
8.
DL Stokes 《Canadian Metallurgical Quarterly》1997,7(4):550-556
Electron microscopy is gradually revealing more and more about the structure of the calcium pump from the sarcoplasmic reticulum, Ca(2+)-ATPase. The most recent result reveals the ATP-binding site, and two different avenues are being pursued towards achieving a higher resolution structure. Although no such structures are currently available for phospholamban, various spectroscopies and site-directed mutagenesis have been combined to produce a compelling structural model for its regulation of Ca(2+)-ATPase. 相似文献
9.
The paper presents recent results in the area of high-power testing aimed at improving the safety of electrical staff working on live equipment. The driver for this work is the American Guide (IEEE 1584) on such exposure hazards, which has the potential for international adoption and, in the authors' opinion, does not provide a suitable methodology for assessing the hazard. A selection of results is presented, obtained in a high-power-system-supplied commercial test laboratory, using the latest charge-coupled device (CCD)-based high-speed video-recording methods. Results are reported for 415-V currents in the range of 1000-70 000 prospective root mean square (rms) amperes and for tests at 5000 V in the range of 1000-27 000 A. The impact of conventional protective devices is included together with some disturbing video results for circuit-breaker-protected systems. The major part of the material in this paper was first presented at the 7th International Conference on Electric Fuses and Their Applications, Jurata, Poland, in 2003. 相似文献
10.
EFFECTOFTHERATIOTh/UONTLDATINGACCURACY¥P.L.Leung(梁宝鎏);MichaelJ.Stokes(DepartmentofPhysicsandMaterialsScience,CityPolytechnico... 相似文献