全文获取类型
收费全文 | 36514篇 |
免费 | 1449篇 |
国内免费 | 63篇 |
专业分类
电工技术 | 372篇 |
综合类 | 29篇 |
化学工业 | 7267篇 |
金属工艺 | 727篇 |
机械仪表 | 746篇 |
建筑科学 | 1985篇 |
矿业工程 | 114篇 |
能源动力 | 1065篇 |
轻工业 | 2929篇 |
水利工程 | 431篇 |
石油天然气 | 118篇 |
武器工业 | 5篇 |
无线电 | 2490篇 |
一般工业技术 | 6145篇 |
冶金工业 | 6721篇 |
原子能技术 | 270篇 |
自动化技术 | 6612篇 |
出版年
2023年 | 215篇 |
2022年 | 440篇 |
2021年 | 683篇 |
2020年 | 466篇 |
2019年 | 619篇 |
2018年 | 781篇 |
2017年 | 697篇 |
2016年 | 834篇 |
2015年 | 757篇 |
2014年 | 1048篇 |
2013年 | 2379篇 |
2012年 | 1691篇 |
2011年 | 2102篇 |
2010年 | 1657篇 |
2009年 | 1555篇 |
2008年 | 1811篇 |
2007年 | 1783篇 |
2006年 | 1600篇 |
2005年 | 1449篇 |
2004年 | 1182篇 |
2003年 | 1126篇 |
2002年 | 1060篇 |
2001年 | 710篇 |
2000年 | 554篇 |
1999年 | 604篇 |
1998年 | 621篇 |
1997年 | 596篇 |
1996年 | 568篇 |
1995年 | 582篇 |
1994年 | 532篇 |
1993年 | 522篇 |
1992年 | 503篇 |
1991年 | 296篇 |
1990年 | 424篇 |
1989年 | 391篇 |
1988年 | 321篇 |
1987年 | 360篇 |
1986年 | 311篇 |
1985年 | 423篇 |
1984年 | 418篇 |
1983年 | 323篇 |
1982年 | 295篇 |
1981年 | 284篇 |
1980年 | 273篇 |
1979年 | 271篇 |
1978年 | 249篇 |
1977年 | 228篇 |
1976年 | 212篇 |
1975年 | 197篇 |
1974年 | 174篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
Vincent Cantarel David Lambertin Arnaud Poulesquen Fabrice Leroux Guillaume Renaudin Fabien Frizon 《Ceramics International》2018,44(9):10558-10568
This work investigates emulsion templating to synthesize hexadecane oil/geopolymer composites. In a system with hexadecane as the internal (dispersed) phase and an alkali activated continuous phase without added surfactant, adding aluminosilicate clay particles does not increase resistance against creaming or coalescence, while adding a surfactant (L35 or CTAB) stabilizes the solid-liquid interface. Infrared studies and rheological studies of the associated geopolymerization determined that the presence of the organic phase or surfactant has no significant effect on the geopolymerization kinetics, as determined by the change in time of the Si-O-T IR stretching frequency and the rheological moduli involved during the process. The stabilization of the organic template is reminiscent of Pickering emulsion even though we employ a much greater amount of inorganic material for geopolymer formation. Although the addition of surfactant has a significant effect on the behavior of the paste, the percolation of the network remains unmodified, highlighting the fact that the phenomenon is not dependent on viscosity. Finally, rheological measurements were used to obtain the mass fractal dimension of the as-made gel network, which is able to differentiate the interfacial effect between surfactant molecules with a slightly denser interphase when a cationic surfactant is used. 相似文献
25.
David L. Wood Jeffrey D. Quass Jianlin Li Shabbir Ahmed David Ventola Claus Daniel 《Drying Technology》2018,36(2):234-244
Processing lithium-ion battery (LIB) electrode dispersions with water as the solvent during primary drying offers many advantages over N-methylpyrrolidone (NMP). An in-depth analysis of the comparative drying costs of LIB electrodes is discussed for both NMP- and water-based dispersion processing in terms of battery pack $/kWh. Electrode coating manufacturing and capital equipment cost savings are compared for water vs. conventional NMP organic solvent processing. A major finding of this work is that the total electrode manufacturing costs, whether water- or NMP-based, contribute about 8–9% of the total pack cost. However, it was found that up to a 2?×?reduction in electrode processing (drying and solvent recovery) cost can be expected along with a $3–6?M savings in associated plant capital equipment (for a plant producing 100,000 10-kWh Plug-in Hybrid Electric Vehicle (PHEV) batteries) using water as the electrode solvent. This paper shows a different perspective in that the most important benefits of aqueous electrode processing actually revolve around capital equipment savings and environmental stewardship and not processing cost savings. 相似文献
26.
27.
Juana Maria de Lourdes Medina-Contreras Patrick Mailloux-Salinas Juventino III Colado-Velazquez Norma Leticia Gomez Viquez Gómez-Viquez Rodrigo Velázquez-Espejel Ana del Carmen Susunaga-Notario David Julian Arias-Chávez Guadalupe Bravo 《Journal of the science of food and agriculture》2020,100(7):3212-3219
28.
29.
30.
Scientometrics - The expanding presence of multinational research teams highlights the importance of characterizing the outcomes of international collaboration. Herein, we characterize the... 相似文献