全文获取类型
收费全文 | 1807篇 |
免费 | 57篇 |
国内免费 | 3篇 |
学科分类
工业技术 | 1867篇 |
出版年
2023年 | 18篇 |
2022年 | 34篇 |
2021年 | 46篇 |
2020年 | 29篇 |
2019年 | 28篇 |
2018年 | 36篇 |
2017年 | 42篇 |
2016年 | 48篇 |
2015年 | 37篇 |
2014年 | 57篇 |
2013年 | 89篇 |
2012年 | 97篇 |
2011年 | 116篇 |
2010年 | 76篇 |
2009年 | 93篇 |
2008年 | 98篇 |
2007年 | 78篇 |
2006年 | 81篇 |
2005年 | 76篇 |
2004年 | 61篇 |
2003年 | 47篇 |
2002年 | 54篇 |
2001年 | 25篇 |
2000年 | 29篇 |
1999年 | 27篇 |
1998年 | 36篇 |
1997年 | 36篇 |
1996年 | 36篇 |
1995年 | 39篇 |
1994年 | 29篇 |
1993年 | 23篇 |
1992年 | 15篇 |
1991年 | 19篇 |
1990年 | 16篇 |
1989年 | 13篇 |
1988年 | 12篇 |
1987年 | 8篇 |
1985年 | 8篇 |
1984年 | 16篇 |
1983年 | 14篇 |
1982年 | 10篇 |
1981年 | 12篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 9篇 |
1977年 | 6篇 |
1976年 | 9篇 |
1974年 | 7篇 |
1973年 | 8篇 |
1948年 | 7篇 |
排序方式: 共有1867条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
Knowledge representation issues related to the modelling of imprecision and uncertainty are discussed in the framework of possibility theory. Differences and relations between possibility theory, fuzzy sets, probability theory and Shafer evidence theory are presented. Then, patterns of reasoning and inference and control procedures are studied in presence of uncertainty and imprecision using a possibilistic approach. the basic ideas and the main trends are emphasized rather than the mathematical and logical foundations or the technical details of implementation which can be found in the references. 相似文献
7.
Carole E. Baddour Cedric L. Briens Serge Bordere Didier Anglerot Patrice Gaillard 《Chemical Engineering and Processing: Process Intensification》2008,47(12):2195-2202
Since their observation in 1976 and 1991, carbon nanotubes (CNTs) have generated much interest due to their properties and potential applications. CNTs are tubular carbon molecules with remarkable mechanical, electrical, chemical and thermal properties, which make them useful in various applications. Industries producing CNTs via the fluidized bed chemical vapor deposition technique face challenges related to the size of CNT bundles. The two main challenges are agglomeration and agglomerate size distribution control. A solution to these challenges involves the use of jet mills to grind the CNT agglomerates. The goal of this study was to determine whether the nanotubes could be ground with air jets using a commercial jet mill and apply a two-parameter model to describe the grinding process. The present study has indicated that air-jet grinding of CNTs is feasible with a typical commercial jet mill. This paper presents the effect of operational parameters on the arithmetic mean diameter of the ground product. Sonic velocity through the grinding nozzles was required to obtain reasonable grinding rates and relatively narrow particle size distributions. This occurs at high air to solids feedrate ratios. Additionally, a simple attrition model can describe the grinding process in the spiral jet mill. 相似文献
8.
Didier SBILLEAU 《核技术(英文版)》2003,14(1)
We present here a general overview of electron spectroscopies from a practical point of view. The most frequently used ones are described and the type of structural information they can provide on materials is explained in relation to the physical processes on which they are based. Furthermore, we explore critically and in detail various tools that have been developed to allow a systematic solving of structures by these spectroscopies. 相似文献
9.
Didier Perrin Céline Guillermain Anne Bergeret José-Marie Lopez-Cuesta Gilles Tersac 《Journal of Materials Science》2006,41(12):3593-3602
A new process of management of waste of composite materials from Sheet Moulding Compounds (SMC), as reinforcing fillers for
thermoplastic materials, including both mechanical and chemical processes is proposed in this paper. Communited SMC being
composed of coated glass fibres intimately mixed with calcium carbonate powder, their reinforcing power is low. First, the
fibrous part was increased by partial dissolution of calcium carbonate present in the crushed products SMC. Second, a process
of partial solvolysis was developed aiming at strong increasing the interfacial mechanical properties by functionalising of
SMC load incorporated into polypropylene/grafted maleic anhydride polypropylene (PP/PPgma). At this effect, we investigated a treatment with a hot triamine (diethylenetriamine, DETA) in order to create a functionalisation,
after scission of the bond ester of unsaturated polyester, as bridging amino-succinimide.The effect of this recycling way
by partial solvolysis was checked from the mechanical properties of the resulting reinforced PP/PPgma material: Although a lower of Young modulus, better yield stress and especially resilience were observed. 相似文献
10.