全文获取类型
收费全文 | 5007篇 |
免费 | 118篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 128篇 |
综合类 | 8篇 |
化学工业 | 1230篇 |
金属工艺 | 148篇 |
机械仪表 | 97篇 |
建筑科学 | 283篇 |
矿业工程 | 28篇 |
能源动力 | 107篇 |
轻工业 | 481篇 |
水利工程 | 57篇 |
石油天然气 | 11篇 |
无线电 | 339篇 |
一般工业技术 | 644篇 |
冶金工业 | 960篇 |
原子能技术 | 79篇 |
自动化技术 | 531篇 |
出版年
2021年 | 71篇 |
2019年 | 57篇 |
2018年 | 47篇 |
2017年 | 57篇 |
2016年 | 69篇 |
2015年 | 73篇 |
2014年 | 104篇 |
2013年 | 209篇 |
2012年 | 138篇 |
2011年 | 214篇 |
2010年 | 137篇 |
2009年 | 144篇 |
2008年 | 178篇 |
2007年 | 148篇 |
2006年 | 153篇 |
2005年 | 120篇 |
2004年 | 107篇 |
2003年 | 104篇 |
2002年 | 119篇 |
2001年 | 72篇 |
2000年 | 76篇 |
1999年 | 85篇 |
1998年 | 172篇 |
1997年 | 138篇 |
1996年 | 107篇 |
1995年 | 95篇 |
1994年 | 80篇 |
1993年 | 75篇 |
1992年 | 56篇 |
1991年 | 55篇 |
1990年 | 70篇 |
1989年 | 66篇 |
1988年 | 56篇 |
1987年 | 64篇 |
1986年 | 60篇 |
1985年 | 71篇 |
1984年 | 68篇 |
1983年 | 66篇 |
1982年 | 60篇 |
1981年 | 50篇 |
1980年 | 50篇 |
1979年 | 53篇 |
1978年 | 69篇 |
1977年 | 76篇 |
1976年 | 93篇 |
1975年 | 69篇 |
1974年 | 69篇 |
1973年 | 80篇 |
1972年 | 58篇 |
1971年 | 54篇 |
排序方式: 共有5131条查询结果,搜索用时 31 毫秒
11.
12.
13.
14.
15.
Walter Binder Ion Constantinescu Boi Faltings Klaus Haller Can Türker 《Autonomous Agents and Multi-Agent Systems》2006,12(2):219-237
This article presents an architecture to automatically create ad-hoc processes for complex value-added services and to execute
them in a reliable way. The uniqueness of ad-hoc processes is to support users not only in standardized situations like traditional
workflows do, but also in unique non-recurring situations. Based on user requirements, a service composition engine generates
such ad-hoc processes, which integrate individual services in order to provide the desired functionality. Our infrastructure
executes ad-hoc processes by transactional agents in a peer-to-peer style. The process execution is thereby performed under
transactional guarantees. Moreover, the service composition engine is used to re-plan in the case of execution failures.
The work presented in this article was supported by the Swiss National Science Foundation as part of the project MAGIC (FNRS-68155),
as well as by the Swiss National Funding Agency OFES as part of the European projects KnowledgeWeb (FP6-507482) and DIP (FP6-507483).
Authors in alphabetic order 相似文献
16.
Samuel L. Manzello Richard G. Gann Scott R. Kukuck Kuldeep Prasad Walter W. Jones 《火与材料》2007,31(5):297-310
A gypsum wall assembly was exposed to an intense real‐scale compartment fire. For the wall assembly, temperatures were measured at the exposed face, within the stud cavity, and at the unexposed face during the fire exposure. Total heat flux gauges were used to measure the temporal variation of the energy incident on the walls, and cameras, both visual and infrared, were used to image the unexposed face of the wall assembly during the fire exposure. The behaviour of the wall assembly under the fire load is discussed as are current model results for a simulation of the fire test. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
17.
Salinger Walter L.; Ladrow Pamela; Wheeler Catherine 《Canadian Metallurgical Quarterly》2003,117(6):1257
Reeler (rl/rl) and reeler/wild-type (+/rl) mice synthesize Reln at subnormal rates, as do patients with schizophrenia, bipolar disorder, and autism, thereby forming the basis for a Reln hypothesis for vulnerability to these psychopathologies and justifying attention to the behavioral phenotypes of Reln-deficient mice. Tests of gait, emotionality, social aggression, spatial working memory, novel-object detection, fear conditioning, and sensorimotor reflex modulation revealed the behavioral phenotype of rl/rl, but not +/rl, mice to be different from that of wild-type (+/+) mice. These results reveal no effect of Reln gene dosage and provide significant challenges to both the Reln and the neurodevelopmental hypotheses of the etiology of major psychopathologies. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
18.
Walter Savassi Eddie Mancini 《The Structural Design of Tall and Special Buildings》2004,13(4):315-333
In a previous paper (Mancini and Savassi, 1999), it was shown that every plane panel, used to brace tall building structures, can be easily and generally approached through the use of the continuous medium technique (CMT) (Albigés and Goulet, 1960). In that paper, following a so‐called local formulation, i.e., by deriving the governing differential equations system of the panel, in terms of u(z) panel horizontal displacement and wi columns or walls axial displacements, the equivalence (likeness) of formal mathematics, and hence of structural behaviour, between the panel composed by a pair of shear walls associated by lintel beams and another panel formed by the plane association, by pinned horizontal bars, of one shear wall and one single bay frame, was also shown. In both cases, axial deformations due to axial forces on vertical members were taken into account. In this paper, confirming those conclusions, but now following a global formulation (i.e., considering the total potential energy of each panel: strain energy plus applied load potentials), the mathematical equivalence between those two types of plane panels is again revealed by comparison of their two total potential energy analytical expressions. Additionally, based on that variational approach, the one‐dimensional finite element formulation is presented. This enlarges the possibilities of solutions for more general types of panels, like those with variable geometry or loading, without any further difficulty. The procedure, for any type of panel, can be codified in one single computer program, very similar to those used to solve plain continuous beam problems. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
19.
Dr. Jana Buchwalter Prof. Dr. Walter Brenner Dr. Rüdiger Zarnekow 《WIRTSCHAFTSINFORMATIK》2002,44(4):345-353
Many companies and purchasing departments only possess a limited knowledge about the modelling of inter-company business processes for electronic procurement. In the past the discussion about electronic procurement was mostly focused on technical aspects. This article introduces a reference process model for procurement auctions. The process model is made up of a basic process, which describes a minimal process for procurement auctions, and a number of process alternatives, which allow for the adoption of the basic process to changing parameters and individual company requirements. 相似文献
20.
In January 1990, a well-established heart transplant program added a psychosocial evaluation procedure to its medical evaluation of potential transplant recipients. To determine the predictive value of psychosocial evaluation for decisions to list patients for a transplant and for ultimate clinical outcomes, we reviewed records of 191 patients who underwent psychosocial evaluation in the subsequent 3 years. Informal prescreening for obvious psychopathology and other disqualifiers almost certainly restricted the ranges of psychosocial factors observed in the sample. Of 120 patients listed, 61 actually received transplants. Psychosocial factors were little used in deciding whether to list the patients and were not predictive of recipients' medical outcome or compliance, but were moderately predictive of complication rates and difficulty of managing patients after transplantation. Although psychosocial evaluation of prescreened potential transplant recipients has little value in predicting medical outcome, it may be useful for planning and scheduling care after transplantation. 相似文献