全文获取类型
收费全文 | 815篇 |
免费 | 52篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 25篇 |
化学工业 | 178篇 |
金属工艺 | 12篇 |
机械仪表 | 18篇 |
建筑科学 | 22篇 |
能源动力 | 19篇 |
轻工业 | 46篇 |
水利工程 | 4篇 |
无线电 | 115篇 |
一般工业技术 | 153篇 |
冶金工业 | 47篇 |
原子能技术 | 2篇 |
自动化技术 | 227篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 34篇 |
2021年 | 42篇 |
2020年 | 34篇 |
2019年 | 35篇 |
2018年 | 30篇 |
2017年 | 19篇 |
2016年 | 29篇 |
2015年 | 20篇 |
2014年 | 42篇 |
2013年 | 56篇 |
2012年 | 59篇 |
2011年 | 64篇 |
2010年 | 39篇 |
2009年 | 50篇 |
2008年 | 45篇 |
2007年 | 42篇 |
2006年 | 30篇 |
2005年 | 34篇 |
2004年 | 29篇 |
2003年 | 20篇 |
2002年 | 14篇 |
2001年 | 8篇 |
2000年 | 4篇 |
1999年 | 11篇 |
1998年 | 20篇 |
1997年 | 4篇 |
1996年 | 11篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1985年 | 5篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有868条查询结果,搜索用时 15 毫秒
31.
Dario Natali Mario Caironi Marco Sampietro Andrew P. Meacham Steven J. Vickers Michael D. Ward 《Optical Materials》2006,28(12):1362-1365
We report on the electrochromic behavior of a dinuclear ruthenium complex, which provides high environmental stability together with an intense absorption maximum at 1237 nm in solution in its +3 oxidation state. To verify its optoelectronic properties, we used this complex as the photoactive material in a planar photodetector prototype for near-infrared light pulses, succeeding in the detection of a train of light pulses at a wavelength of 1280 nm. 相似文献
32.
Holahan Matthew R.; Taverna Franco A.; Emrich Stephen M.; Louis Meira; Muller Robert U.; Roder John C.; McDonald Robert J. 《Canadian Metallurgical Quarterly》2005,119(6):1563
Male Long-Evans rats were injected with 32 ng/μl of the N-methyl-D-aspartate (NMDA) receptor antagonist 3-(2-carboxypiperazin-4-yl) propyl-1-phosphonic acid (CPP) or vehicle and trained to locate a hidden platform in a different location (reversal training) than used on the initial 4 days of training. Rats treated with vehicle or CPP into the dorsal hippocampus, basolateral amygdala, or mediodorsal striatum had similar latencies to locate the platform on the reversal day. Rats infused with CPP into the dorsal hippocampus or mediodorsal striatum failed to search preferentially in the novel location during a 24-hr, drug-free retention test, whereas all other groups searched preferentially in this location. Therefore, blocking dorsal hippocampal or mediodorsal striatal NMDA receptors selectively blocked long-term spatial retention without producing short-term performance deficits. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
33.
Dario Forte 《Network Security》1998,1998(5):15-19
During a recent conference on Information Security, a group of experts raised the issue of the potential problems with the security of Java, initiating an interesting discussion between the developers and technicians at Sun Microsystems. This article considers Java security from an Italian perspective. 相似文献
34.
35.
Dario Imbraguglio Andrea Mario Giovannozzi Annalisa Nastro Andrea Mario Rossi 《Nanoscale research letters》2012,7(1):530
Three-dimensional submicrometric structures and biomolecular patterns have been fabricated on a porous silicon film by an electron beam-based functionalization method. The immobilized proteins act as a passivation layer against material corrosion in aqueous solutions. The effects'' dependence on the main parameters of the process (i.e., the electron beam dose, the biomolecule concentration, and the incubation time) has been demonstrated. 相似文献
36.
37.
In literature, a large number of studies on the Italian districts exhibit a portrait which points out the Italian economic specificity. A specific feature of the Italian districts is the large number of collaborative actions carried on by the associated enterprises which are not limited to the solution of the usual supply chain management problems. As not all the collaborative actions bring immediate (and measurable) economic benefits, there is the need for a reliable and unbiased method aimed at the identification and analysis of the collaborative patterns inside an industry network, to determine their presence and effectiveness. The proposed method uses a graph representation of the inter-firm relationships inside a network and induces the presence of collaborative behaviours by the analysis of the graph topology. 相似文献
38.
Kim Christensen Dario Papavassiliou Alexandre de Figueiredo Nigel R. Franks Ana B. Sendova-Franks 《Journal of the Royal Society Interface》2015,12(102)
Prediction for social systems is a major challenge. Universality at the social level has inspired a unified theory for urban living but individual variation makes predicting relationships within societies difficult. Here, we show that in ant societies individual average speed is higher when event duration is longer. Expressed as a single scaling function, this relationship is universal because for any event duration an ant, on average, moves at the corresponding average speed except for a short acceleration and deceleration at the beginning and end. This establishes cause and effect within a social system and may inform engineering and control of artificial ones. 相似文献
39.
Machine Learning - Gaussian processes (GPs) are distributions over functions, which provide a Bayesian nonparametric approach to regression and classification. In spite of their success, GPs have... 相似文献
40.