全文获取类型
收费全文 | 1169篇 |
免费 | 20篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 14篇 |
化学工业 | 276篇 |
金属工艺 | 55篇 |
机械仪表 | 38篇 |
建筑科学 | 9篇 |
矿业工程 | 1篇 |
能源动力 | 45篇 |
轻工业 | 60篇 |
水利工程 | 8篇 |
石油天然气 | 4篇 |
无线电 | 91篇 |
一般工业技术 | 322篇 |
冶金工业 | 87篇 |
原子能技术 | 16篇 |
自动化技术 | 164篇 |
出版年
2023年 | 9篇 |
2022年 | 26篇 |
2021年 | 33篇 |
2020年 | 25篇 |
2019年 | 21篇 |
2018年 | 25篇 |
2017年 | 26篇 |
2016年 | 24篇 |
2015年 | 24篇 |
2014年 | 30篇 |
2013年 | 91篇 |
2012年 | 54篇 |
2011年 | 89篇 |
2010年 | 63篇 |
2009年 | 62篇 |
2008年 | 59篇 |
2007年 | 52篇 |
2006年 | 32篇 |
2005年 | 35篇 |
2004年 | 26篇 |
2003年 | 21篇 |
2002年 | 25篇 |
2001年 | 18篇 |
2000年 | 26篇 |
1999年 | 27篇 |
1998年 | 28篇 |
1997年 | 18篇 |
1996年 | 21篇 |
1995年 | 13篇 |
1994年 | 11篇 |
1993年 | 10篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 9篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 15篇 |
1981年 | 11篇 |
1980年 | 10篇 |
1979年 | 12篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1974年 | 3篇 |
排序方式: 共有1190条查询结果,搜索用时 15 毫秒
1.
Kumar Kuila Saikat Kumbhakar Partha Sekhar Tiwary Chandra Kumar Kundu Tarun 《Journal of Materials Science》2022,57(19):8658-8675
Journal of Materials Science - Hybrid oxidation methodologies (HOMs) and active site enrichment of 2D nanocatalyst through defects induction are ubiquitously used for generating adequate reactive... 相似文献
2.
3.
4.
Mandal Tarun K.; Mukhopadhyay Chaitali 《Protein engineering, design & selection : PEDS》2002,15(12):979-986
Galectins show remarkable binding specificity towards ß-galactosides.A recently developed method for calculating binding free energiesbetween a protein and its substrates has been used to evaluatethe binding specificity of galectin-3. Five disaccharides anda tetrasaccharide were used as the substrates. The calculatedbinding free energies agree quite well with the experimentaldata and the ranking of binding affinities is well reproduced.For all the six proteinligand complexes it was observedthat electrostatic interactions oppose binding whereas the non-polarcontributions drive complex formation. The observed bindingspecificity of galectin-3 for galactosides rather than glucosidesis discussed in light of our results. 相似文献
5.
In the catalytic reaction of an iron(III) porphyrin with t-BuOOH, CumOOH, H2O2 and C6F5IO, cyclohexene was used as a probe substrate. The selective hydroxylation of cyclohexene by hydroperoxides proceeds through radical path and this has been utilized for successful dioxygen activation/autooxidation. For other oxidants epoxide was the major product and the reactions proceed through non-radical path. 相似文献
6.
Applying the critical path method to manufacturing routing 总被引:1,自引:0,他引:1
Traditionally the critical path method (CPM) has been used primarily as an a'priori planning and scheduling device. Its applications have typically been limited to one-shot projects, usually with a long period of completion time. This paper proposes taking these ideas to continuous production systems, and to implement the CPM not just at the outset but throughout the process. The algorithm calls for repeatedly calculating the critical path through the production process and routing parts so as to remain off this path. Before the model is presented, some basic ideas are introduced from group technology (GT) and CPM. After the presentation of the model, two potential implementations with the usage of computer are proposed. 相似文献
7.
8.
The increasing need to instruct students in the use of personal computer software, especially electronic spreadsheets, is placing greater demands on the already full university curriculum. A potential help in meeting these demands is the readily available computer-based software tutorials. In order to explore the feasibility of computer-based instruction as an alternative to human instruction, this research compares two modes of instruction, computer-based and human. An experiment was conducted with groups of business student subjects. The research results indicate no difference in students' attitude towards computer-based instruction and human instruction of spreadsheets. Students' short-term recall of the software syntax being taught is as strong with computer-based instruction as with human instruction. These results were not affected by the level of personal computer experience that students had prior to the experiment. However, the ability to comprehend and immediately apply the software to a task is greater with human instruction than with computer-aided instruction. This advantage holds true for students instructed by experienced and inexperienced instructors. 相似文献
9.
Amiya S. Sanyal Joydeb Mukerji Siddhartha Bandyopadhyay 《Journal of the American Ceramic Society》1991,74(9):2312-2314
Mössbauer spectra of the products obtained by carbothermal reduction and distribution of silica in the presence of iron in the temperatures range 1200o to 1540o were studied. The preponderance of β- Si3 N4 over the α form at a higher reaction temperature were assumed to be related to the formation of an Fe-Si-N liquid. The liquid did not alter its composition with the variation of reduction-temprature, Iron had no effect on the reaction mechanism below 1300o C. 相似文献
10.