全文获取类型
收费全文 | 2674篇 |
免费 | 136篇 |
国内免费 | 12篇 |
专业分类
电工技术 | 28篇 |
化学工业 | 815篇 |
金属工艺 | 56篇 |
机械仪表 | 80篇 |
建筑科学 | 92篇 |
矿业工程 | 21篇 |
能源动力 | 85篇 |
轻工业 | 194篇 |
水利工程 | 18篇 |
石油天然气 | 8篇 |
武器工业 | 1篇 |
无线电 | 222篇 |
一般工业技术 | 521篇 |
冶金工业 | 159篇 |
原子能技术 | 33篇 |
自动化技术 | 489篇 |
出版年
2023年 | 32篇 |
2022年 | 121篇 |
2021年 | 117篇 |
2020年 | 87篇 |
2019年 | 65篇 |
2018年 | 97篇 |
2017年 | 100篇 |
2016年 | 97篇 |
2015年 | 92篇 |
2014年 | 128篇 |
2013年 | 207篇 |
2012年 | 154篇 |
2011年 | 180篇 |
2010年 | 132篇 |
2009年 | 126篇 |
2008年 | 134篇 |
2007年 | 103篇 |
2006年 | 89篇 |
2005年 | 82篇 |
2004年 | 59篇 |
2003年 | 56篇 |
2002年 | 48篇 |
2001年 | 30篇 |
2000年 | 27篇 |
1999年 | 28篇 |
1998年 | 39篇 |
1997年 | 24篇 |
1996年 | 19篇 |
1995年 | 25篇 |
1994年 | 24篇 |
1993年 | 22篇 |
1992年 | 15篇 |
1991年 | 16篇 |
1990年 | 11篇 |
1989年 | 13篇 |
1988年 | 11篇 |
1987年 | 24篇 |
1986年 | 15篇 |
1985年 | 15篇 |
1984年 | 13篇 |
1983年 | 9篇 |
1982年 | 16篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 11篇 |
1976年 | 7篇 |
1975年 | 9篇 |
1974年 | 7篇 |
1973年 | 13篇 |
1972年 | 8篇 |
排序方式: 共有2822条查询结果,搜索用时 15 毫秒
81.
Ivan Rodero David Villegas Norman Bobroff Yanbin Liu Liana Fong S. Masoud Sadjadi 《Journal of Grid Computing》2013,11(2):311-336
The goal of Grid computing is to integrate the usage of computer resources from cooperating partners in the form of Virtual Organizations (VO). One of its key functions is to match jobs to execution resources efficiently. For interoperability between VOs, this matching operation occurs in resource brokering middleware, commonly referred to as the meta-scheduler or meta-broker. In this paper, we present an approach to a meta-scheduler architecture, combining hierarchical and peer-to-peer models for flexibility and extensibility. Interoperability is further promoted through the introduction of a set of protocols, allowing meta-schedulers to maintain sessions and exchange job and resource state using Web Services. Our architecture also incorporates a resource model that enables an efficient resource matching across multiple Virtual Organizations, especially where the compute resources and state are dynamic. Experiments demonstrate these new functional features across three distributed organizations (BSC, FIU, and IBM), that internally use different job scheduling technologies, computing infrastructure and security mechanisms. Performance evaluations through actual system measurements and simulations provide the insights on the architecture’s effectiveness and scalability. 相似文献
82.
Michal Pluhacek Roman Senkerik Ivan Zelinka 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2014,18(4):631-639
In this paper, the utilization of different chaotic systems as pseudo-random number generators (PRNGs) for velocity calculation in the PSO algorithm are proposed. Two chaos-based PRNGs are used alternately within one run of the PSO algorithm and dynamically switched over when a certain criterion is met. By using this unique technique, it is possible to improve the performance of PSO algorithm as it is demonstrated on different benchmark functions. 相似文献
83.
This article reports an extraction–purification of napins from an industrial rapeseed meal and the assessment of their antimicrobial activity against Fusarium langsethiae. The best extraction conditions are observed at pH 2, 12% (w/w) of rapeseed meal after 15 min of extraction in water at room temperature. Under these conditions the extraction is highly selective, allowing a simple purification process (ammonium sulfate precipitation followed by desalting size exclusion chromatography) to get purified napins. These napins possessed significant anti-Fusarium activity (IC50 = 70 μM) and a compact secondary structure rich in α-helix, which may explain this bioactivity. 相似文献
84.
Oswaldo Burciaga-DiazJose Ivan Escalante-Garcia Alexander Gorokhovsky 《Cement and Concrete Composites》2012,34(1):18-24
A coarse mineral with 70% kaolinite and 30% quartz was calcined and chemically activated by alkaline solutions of Na2SiO3 and NaOH. The compressive strength evolution was investigated as a function of the curing temperature at 20 and 80 °C, and the molar ratios of SiO2/Al2O3 (2.64-4.04) and Na2O/Al2O3 (0.62-1.54). For curing at 20 °C, the best composition was SiO2/Al2O3 = 2.96 and NaO/Al2O3 = 0.62, reaching 85 MPa at 28 days. Curing at 80 °C had a positive effect on the strength development only in the first 3 days. X-ray diffraction of the geopolymeric formulations showed the formation of amorphous silicoaluminates of similar nature. The microstructure consisted of unreacted quartz and metakaolinite particles in a matrix of silicoaluminate polymer and condensed silica gel from the unreacted sodium silicate. 相似文献
85.
86.
87.
Igor V. Zagaynov Ivan V. Shelepin Anatoly A. Konovalov Ekaterina A. Obraztsova Alexander V. Naumkin Alexey V. Bykov Vladimir G. Leontiev 《Ceramics International》2021,47(6):8142-8149
Ceria based solid solutions doped by Gd, Bi, and the third dopant were synthesized by the co-precipitation method with ultrasonic treatment, followed by calcination at the temperature of 500°С. Characterization of the synthesized nanosystems by XRD, TEM, TG, Raman spectroscopy, FTIR, XPS was carried out. It is shown that all obtained powders of solid solutions crystallized into a cubic structure of the fluorite type, with an average particle size of 5–15 nm. The samples had a mesoporous structure of the pore diameter of 2–5 nm. The catalytic activity of Gd-Bi-M-Ce-O (M = Cu, Zr, Ni, Co, Mn) solid solutions was carried out. The catalyst Gd0.05Bi0.15Mn0.20Ce0.60O2 has the lowest oxidation temperature. 相似文献
88.
89.
Dicho Stratiev Ivelina Shishkova Mihail Ivanov Ivan Chavdarov Dobromir Yordanov 《化学工程与技术》2020,43(11):2266-2276
The effect of the quality of ebullated bed vacuum residue H-Oil hydrocracking gas oils cracked in a commercial fluid catalytic cracking unit (FCCU) on its performance was studied. Six different catalysts were employed in this study. Four catalysts were tested in a commercial FCCU, and two in a laboratory FCCU. An increase of the H-Oil hydrocracker reaction temperature was associated with a decrease in the KW factor of the H-Oil gas oils. The diminished KW factor of H-Oil gas oils resulted in lower FCCU conversion and higher regenerator temperatures. The FCC conversion at maximum gasoline yield is best predicted by the feed KW factor. The higher-activity, higher-Δcoke catalyst is unfavorable for FCCU performance because the excessive regenerator temperature excursions require reduction of the throughput. 相似文献
90.