全文获取类型
收费全文 | 1179篇 |
免费 | 29篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 48篇 |
化学工业 | 242篇 |
金属工艺 | 74篇 |
机械仪表 | 48篇 |
建筑科学 | 29篇 |
能源动力 | 36篇 |
轻工业 | 114篇 |
水利工程 | 12篇 |
无线电 | 73篇 |
一般工业技术 | 200篇 |
冶金工业 | 174篇 |
原子能技术 | 27篇 |
自动化技术 | 132篇 |
出版年
2023年 | 4篇 |
2021年 | 16篇 |
2020年 | 12篇 |
2019年 | 12篇 |
2018年 | 14篇 |
2017年 | 12篇 |
2016年 | 13篇 |
2015年 | 12篇 |
2014年 | 25篇 |
2013年 | 75篇 |
2012年 | 47篇 |
2011年 | 65篇 |
2010年 | 34篇 |
2009年 | 46篇 |
2008年 | 73篇 |
2007年 | 78篇 |
2006年 | 59篇 |
2005年 | 45篇 |
2004年 | 37篇 |
2003年 | 39篇 |
2002年 | 35篇 |
2001年 | 26篇 |
2000年 | 17篇 |
1999年 | 20篇 |
1998年 | 76篇 |
1997年 | 40篇 |
1996年 | 42篇 |
1995年 | 28篇 |
1994年 | 20篇 |
1993年 | 18篇 |
1992年 | 13篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 15篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 12篇 |
1982年 | 6篇 |
1981年 | 11篇 |
1980年 | 8篇 |
1979年 | 10篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1976年 | 9篇 |
1975年 | 3篇 |
1974年 | 5篇 |
1973年 | 3篇 |
排序方式: 共有1209条查询结果,搜索用时 31 毫秒
51.
Julie K. Furmick Dr. Ichiro Kaneko Angela N. Walsh Joanna Yang Jaskaran S. Bhogal Geoffrey M. Gray Juan C. Baso Drew O. Browder Jessica L. S. Prentice Luis A. Montano Chanh C. Huynh Lisa M. Marcus Dorian G. Tsosie Jungeun S. Kwon Alexis Quezada Nicole M. Reyes Brittney Lemming Puneet Saini Dr. Arjan van der Vaart Dr. Thomas L. Groy Dr. Pamela A. Marshall Dr. Peter W. Jurutka Dr. Carl E. Wagner 《ChemMedChem》2012,7(9):1551-1566
52.
To survive worldwide competitions of research and development in the current rapid increase of information, decision-makers and researchers need to be supported to find promising research fields and papers. But finding those fields from an available data in too much heavy flood of information becomes difficult. We aim to develop a methodology supporting to find emerging leading papers with a bibliometric approach. The analyses in this work are about four academic domains using our time transition analysis. In the time transition analysis, after citation networks are constructed, centralities of each paper are calculated and their changes are tracked. Then, the centralities are plotted, and the features of the leading papers are extracted. Based on the features, we proposed ways to detect the leading papers by focusing on in-degree centrality and its transition. This work will contribute to finding the leading paper, and it is useful for decision-makers and researchers to decide the worthy research topic to invest their resources. 相似文献
53.
Ichiro Imae Yuto Nakamura Kenji Komaguchi Yousuke Ooyama Joji Ohshita Yutaka Harima 《Science and Technology of Advanced Materials》2012,13(4)
We have developed a simple method of fabricating transparent conductive films with a high mechanical strength on glass and indium tin oxide substrates. It does not require a large excess of organic solvents and polymerization catalysts and can yield smooth films by spin-coating of a mixture of a commercially available aqueous dispersion of poly(3,4-ethylenedioxythiophene)-poly(4-styrene sulfonate) and a neat liquid of tetraethyl orthosilicate. Preparation conditions such as feed ratio, kinds of additives, and annealing temperature and time were optimized to give highly conductive, transparent and mechanically strong films. 相似文献
54.
55.
Electrochemical carbonylation of phenol with CO to diphenyl carbonate (DPC) using Pd electrocatalyst was studied at P(CO) = 1 atm and room temperature. Electrochemical carbonylation was conducted by galvanostatic electrolysis at 1 mA in electrolyte solutions containing phenol, sodium phenoxide and CH3CN. It was found that electrochemical carbonylation by Pd was promoted by using 1,3-dimesitylimidazol-2-ylidene (IMes) ligand of a N-heterocyclic carbene. The current efficiency of DPC increased more than 3.4 times using the IMes ligand. The maximum current efficiency of DPC formation was 45 %. 相似文献
56.
Yuki Chikahiro Ichiro Ario Piotr Pawlowski Cezary Graczykowski Jan Holnicki‐Szulc 《Computer-Aided Civil and Infrastructure Engineering》2019,34(6):523-538
Scissors mechanisms are commonly used in safety engineering during the construction of temporary structures, owing to their inherent advantages of foldability, transformability, and reusability. We effectively utilized these scissors mechanism features to develop a lightweight, deployable emergency Mobile Bridge (MB) based on optimization, and control of the folding structure. Here, we discuss the problems of optimal reinforcement layout for the MB by formulating and solving three optimization problems, namely: (a) the load capacity maximization problem, (b) the weight minimization problem, and (c) coupling the load capacity maximization problem and the weight minimization problem. The potential benefits resulting from the application of reinforcement were evaluated using a combination of finite element analysis and an optimization algorithm based on the differential evolution method. The results demonstrate the significant positive influence of the additional reinforcing members. In particular, the limit load was increased by over 10 times, while the weight was decreased to approximately half. The proposed methodology enabled the development of a substantially improved version of the MB characterized by a higher load capacity and lower weight in comparison to the initial bridge design. 相似文献
57.
58.
Huawei Chen Xiaopeng Shang Ichiro Hagiwara Deyuan Zhang 《Journal of Porous Materials》2012,19(4):511-518
Patterned micro- and nanostructure are of great significance in industrial applications such as electronics, optics and sensors. Microporous honeycomb film of polyhpenylene oxide (PPO) was fabricated as the template via evaporation of solution in carbon bisulfide under humid ambience. The effect of fabrication conditions on patterned microstructure was investigated by self-organization experiments to build quantitative relationship between ambient conditions such as humidity, concentration and honeycomb microstructure (diameter and height), through which the honeycomb film formation can be controlled to self-organize desirable PPO patterned microstructure. Especially, the height of honeycomb was derived from the diameter of honeycomb, and its validity was clarified by morphological comparison between PPO template and PDMS molded structure. Moreover, soft mold experiments were conducted to demonstrate its high efficiency and excellence as an alternative to construct regular micro-pattern. 相似文献
59.
Ichiro Imae 《Materials Chemistry and Physics》2012,131(3):752-756
Polythiophene containing 3,4-ethylenedioxythiophene (EDOT), poly(3′,4′-ethylenedioxy-2,2′:5′,2′′-terthiophene), was synthesized by electrochemical oxidation of the corresponding monomer, 3′,4′-ethylenedioxy-2,2′:5′,2′′-terthiophene, in acetonitrile. The resulting polymer was soluble in DMSO and THF, and was characterized by 1H NMR and mass spectroscopies, and GPC. The electrical conductivity of the oxidized polymer film was found to be comparable to those for polythiophene and poly(methylthiophene) despite of its short π-conjugation length. 相似文献
60.
Zhiling Li Yasushi Inoue Suyin Yang Naoko Yoshida Arata Katayama 《Journal of Bioscience and Bioengineering》2010,110(3):326-332
A mass balance and kinetic investigation of anaerobic dechlorination of pentachlorophenol (PCP) was undertaken using an enriched microbial consortium in a laboratory scale continuous flow column, as a model microbial permeable reactive barrier. The chlorine balance showed that 50 µM PCP was largely dechlorinated to phenol with the formation of a small quantity of 3-chlorophenol as an intermediate metabolite (hydraulic retention time 7.6 days), and the chlorine removal efficiency reached 36 µM d-1. When the initial PCP concentration was increased to 100 µM the chlorine removal efficiency increased 1.5 times. However, the dechlorination activity disappeared after 7.4 pore volumes (58 days), demonstrating the susceptibility of the dechlorination culture to high concentrations of PCP. Lactate released hydrogen as an electron donor during PCP dechlorination, with acetate, propionate, CO2 and CH4 as byproducts. The carbon balance showed that some of the organic carbon source (PCP, lactate) in the influent was converted to gas and utilized for biomass growth in addition to organic metabolites. The kinetic study was conducted in a batch culture and yielded 1.99 mg l-1 biomass growth per unit of chlorine consumption (µM). The Monod equation was well fitted to the specific growth rate of 1.38 d-1 and a half saturation constant of 0.29 µM. The organic chlorine removal rate in the batch culture was consistent with the results in the flow column, indicating the feasibility of and potential for in situ estimation and prediction through batch culture studies. 相似文献