全文获取类型
收费全文 | 2326篇 |
免费 | 77篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 19篇 |
综合类 | 1篇 |
化学工业 | 500篇 |
金属工艺 | 42篇 |
机械仪表 | 33篇 |
建筑科学 | 109篇 |
矿业工程 | 4篇 |
能源动力 | 28篇 |
轻工业 | 333篇 |
水利工程 | 18篇 |
石油天然气 | 3篇 |
无线电 | 135篇 |
一般工业技术 | 353篇 |
冶金工业 | 423篇 |
原子能技术 | 24篇 |
自动化技术 | 381篇 |
出版年
2023年 | 26篇 |
2022年 | 28篇 |
2021年 | 43篇 |
2020年 | 36篇 |
2019年 | 37篇 |
2018年 | 66篇 |
2017年 | 55篇 |
2016年 | 58篇 |
2015年 | 42篇 |
2014年 | 55篇 |
2013年 | 156篇 |
2012年 | 100篇 |
2011年 | 134篇 |
2010年 | 114篇 |
2009年 | 83篇 |
2008年 | 109篇 |
2007年 | 100篇 |
2006年 | 70篇 |
2005年 | 86篇 |
2004年 | 75篇 |
2003年 | 60篇 |
2002年 | 56篇 |
2001年 | 40篇 |
2000年 | 31篇 |
1999年 | 31篇 |
1998年 | 60篇 |
1997年 | 38篇 |
1996年 | 37篇 |
1995年 | 30篇 |
1994年 | 39篇 |
1993年 | 37篇 |
1992年 | 31篇 |
1991年 | 26篇 |
1990年 | 30篇 |
1989年 | 26篇 |
1988年 | 27篇 |
1987年 | 28篇 |
1986年 | 24篇 |
1985年 | 21篇 |
1984年 | 24篇 |
1983年 | 26篇 |
1982年 | 25篇 |
1981年 | 24篇 |
1980年 | 22篇 |
1979年 | 28篇 |
1978年 | 10篇 |
1977年 | 11篇 |
1976年 | 8篇 |
1975年 | 12篇 |
1973年 | 8篇 |
排序方式: 共有2406条查询结果,搜索用时 15 毫秒
1.
Vivien Walsh Robin Roy Margaret Bruce Stephen Potter 《Creativity & Innovation Management》1993,2(2):78-86
A series of studies of top European and other firms has revealed patterns of design management associated with commercial success. Firms that invest resources and professional expertise in product and industrial design in traditional and new industries have been commercially more successful than firms that pay less attention to these aspects of design. As an industry matures there is a shift in emphasis from design associated with technological innovation, to designs supporting technical improvements, and then to supporting user needs, fashion and product variants. These issues are illustrated through the history of the evolution of the bicycle. 相似文献
2.
Action calculi, which generalise process calculi such as Petri nets, π-calculusand ambient calculus, have been presented
in terms of action graphs. We here offer linear action graphs as a primitive basis for action calculi. This paper presents the category of embeddings of undirected linear
action graphs without nesting, using a novel form of graphical reasoning which simplifies some otherwise complex manipulations
in regular algebra. The results are adapted in a few lines to directed graphs. This work is part of a long-term search for
a uniform behavioural theory for process calculi.
Received October 2000 / Accepted in revised form April 2001 相似文献
3.
Mulcahy Nicholas J.; Call Josep; Dunbar Robin I. M. 《Canadian Metallurgical Quarterly》2005,119(1):23
Two important elements in problem solving are the abilities to encode relevant task features and to combine multiple actions to achieve the goal. The authors investigated these 2 elements in a task in which gorillas (Gorilla gorilla) and orangutans (Pongo pygmaeus) had to use a tool to retrieve an out-of-reach reward. Subjects were able to select tools of an appropriate length to reach the reward even when the position of the reward and tools were not simultaneously visible. When presented with tools that were too short to retrieve the reward, subjects were more likely to refuse to use them than when tools were the appropriate length. Subjects were proficient at using tools in sequence to retrieve the reward. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
4.
5.
A total of 188 employed mothers and fathers and their 5–7 yr-old child participated in a study of the relations between the nature of adults' work and their parenting attitudes and behaviors (a line of research influenced by both socialization and stress perspectives). In general, positive features of work (i.e., complexity of work with people, challenge, and stimulation) tended to be associated with both self-report and observational measures of developmentally sound parenting (e.g., less harsh discipline, more warmth and responsiveness). Interaction effects indicated that gender of parent and child further condition these relations. Analyses partially support the interpretation that conditions of work influence parenting through their effect on mood but also suggest that certain conditions of work may directly socialize behavior in the parental role (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
Robin Daniel J.; Berthier Neil E.; Clifton Rachel K. 《Canadian Metallurgical Quarterly》1996,32(5):824
Infants were presented with a moving object under 2 lighting conditions to investigate the role of vision in early reaching. The motion of the target object also allowed for an analysis of the infants' ability to use a predictive style of reaching. Infants were tested twice, at 5 and 7.5 months of age, with a moving object in the light and the same object painted with luminescent paint in the dark. Infants successfully contacted the glowing object on about half of their attempts at both ages, although 7.5 month-olds reached more often. Infants also took into account the motion of the target object by aiming their reaches ahead of the object and by reaching with their contralateral hand. These results suggest that proprioceptive feedback and sight of the target allow for successful reaching with limited visual information, even in relatively complex reaching tasks. The infants' success also demonstrates their ability to adapt their movements and reaching strategy to the speed and trajectory of the target object in order to reach predictively. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
David C. Apperley Robin K. Harris Gregory L. Marshall Derek P. Thompson 《Journal of the American Ceramic Society》1991,74(4):777-782
The 29 Si MAS NMR spectra of the 2H, 4H, 6H, and 3C polytypes of silicon carbide are presented. An attempt is made to correlate differences in the chemical shifts with local atomic environment. The results of the analysis of the spectra of pure polytypes are used as a basic for the interpretation of the spectra of mixed polytypes and a discussion of the crystallinity and impurity levels of different samples. Carbon-13 chemical shifts obtained from spectra of the same polytypes are also tabulated. 相似文献
8.
Integrated Microfluidic CustomArray Device for Bacterial Genotyping and Identification 总被引:2,自引:0,他引:2
9.
Robin Carr D. H. Thomas T. S. Venkataraman Allan L. Smith Michael A. Gealt R. Quinn M. Tanyel 《工程教育杂志》1995,84(2):137-150
All fields of engineering, whether chemical, civil, electrical, materials, mechanical, etc., encompass a common body of essential mathematics and science. In the freshman year of Drexels E4 program, this common mathematical and scientific foundation is cultivated in the Mathematical and Scientific Foundations of Engineering I, II and III (MSFE I, MSFE II, MSFE III). In an integrated fashion, MSFE I presents the essential calculus, physics and engineering mechanics vital to the freshman engineering student. In the first two quarters, MSFE II presents chemistry with clearly defined engineering applications and significance: in the third quarter, MSFE II presents living systems with the same thrust. Also in the third quarter, MSFE III presents basic circuits and circuit elements, and a brief introduction to electromagnetic theory. 相似文献
10.
Campillo Mauricio Sedaghati Ramin Drew Robin A. L. Alfonso Ismeli Prez Luis 《Engineering with Computers》2021,38(3):1767-1785
Engineering with Computers - In this article, a methodology based on Discrete Element Method (DEM) and Finite Elements Method (FEM) combined with modified Approximate Periodic Boundary Condition... 相似文献