全文获取类型
收费全文 | 3032篇 |
免费 | 88篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 15篇 |
综合类 | 10篇 |
化学工业 | 546篇 |
金属工艺 | 27篇 |
机械仪表 | 46篇 |
建筑科学 | 209篇 |
矿业工程 | 21篇 |
能源动力 | 89篇 |
轻工业 | 318篇 |
水利工程 | 37篇 |
石油天然气 | 11篇 |
无线电 | 262篇 |
一般工业技术 | 523篇 |
冶金工业 | 506篇 |
原子能技术 | 16篇 |
自动化技术 | 488篇 |
出版年
2022年 | 16篇 |
2021年 | 48篇 |
2020年 | 36篇 |
2019年 | 40篇 |
2018年 | 48篇 |
2017年 | 43篇 |
2016年 | 41篇 |
2015年 | 59篇 |
2014年 | 73篇 |
2013年 | 211篇 |
2012年 | 98篇 |
2011年 | 174篇 |
2010年 | 110篇 |
2009年 | 115篇 |
2008年 | 139篇 |
2007年 | 142篇 |
2006年 | 119篇 |
2005年 | 110篇 |
2004年 | 87篇 |
2003年 | 84篇 |
2002年 | 66篇 |
2001年 | 53篇 |
2000年 | 61篇 |
1999年 | 58篇 |
1998年 | 129篇 |
1997年 | 79篇 |
1996年 | 66篇 |
1995年 | 55篇 |
1994年 | 65篇 |
1993年 | 49篇 |
1992年 | 50篇 |
1991年 | 28篇 |
1990年 | 33篇 |
1989年 | 27篇 |
1988年 | 33篇 |
1987年 | 27篇 |
1986年 | 29篇 |
1985年 | 44篇 |
1984年 | 36篇 |
1983年 | 28篇 |
1982年 | 33篇 |
1981年 | 21篇 |
1980年 | 24篇 |
1979年 | 28篇 |
1978年 | 23篇 |
1977年 | 22篇 |
1976年 | 43篇 |
1975年 | 20篇 |
1973年 | 16篇 |
1972年 | 16篇 |
排序方式: 共有3124条查询结果,搜索用时 15 毫秒
1.
To overcome the drawbacks of solid microporous materials for CO2 capture, this proof‐of‐concept study demonstrates a low‐cost and rapid method for producing composites consisting of hypercrosslinked polymers (HCP) with a polyethyleneimine (PEI) binder. The resulting materials capture CO2 through physical and chemical absorption simultaneously. Compared with HCP, the composites exhibit higher CO2 uptake, higher volumetric density, and improved tolerance to water which is attributed to the PEI binder. 相似文献
2.
Quality of service has become today a major concern for operators of mobile communication networks. The massive development of networks and strong competition between operators has lead to the necessary and daily follow-up of network quality of service, a key factor for its subscriber’s fidelity. This article aims at presenting the optimization methodology and proposes its illustration with a case of RNO (Radio Network Optimisation) software usage, one of the Alcatel optimization toolchain component. After a short presentation of cellular network, the optimization basic principles are described. RNO software and its main functionnalities are then detailed before a last part dedicated to a real case of optimization done with RNO software. 相似文献
3.
The telecommunications information networking architecture (TINA), which builds on the current advances in broadband communication and distributed computing technologies, specifying a software-based architecture for future information networks that are required to transport multimedia information and manage multimedia communication, is described. An important aspect of the architecture is that service segment functions are separated from delivery segment functions. Another key aspect is the elimination of the rigid division between network applications and operations applications that exists in current-day networks. In the TINA architecture, both kinds of applications execute on a common distributed processing platform that hides from applications the effects and complexities introduced by distribution. The architecture supports application interoperability enabling flexible construction of services, composed of service components distributed across network domains, allowing network operators and service providers to cooperatively meet the needs of the user 相似文献
4.
Bound-state beta decay of highly ionized atoms 总被引:1,自引:0,他引:1
5.
6.
7.
Colin Palmer 《International Journal of Project Management》1985,3(4):208-216
There are many ways in which quantitative decision models can be applied in project management. The introduction of a project evaluation review technique network model to the development of a school education service in the city of Delhi, India, is described. The reasons for choosing this method, its advantages and limitations are discussed. Examples of the information obtained from the model are presented and explained. 相似文献
8.
9.
10.
With this volume, the 47-year old Canadian Journal of Psychology takes a new name and makes a renewed commitment. In retitling the journal the Canadian Journal of Experimental Psychology, the intention is to reflect more clearly what has always been the major goal of the journal--to publish the best new research in experimental psychology, both Canadian and international, in both French and English. I am honoured to become the tenth editor of the major journal for experimental psychology in Canada. CJP has served the field very well; my primary goal is to ensure that CJEP continues to do so. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献