全文获取类型
收费全文 | 252篇 |
免费 | 21篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 1篇 |
综合类 | 2篇 |
化学工业 | 54篇 |
金属工艺 | 1篇 |
机械仪表 | 14篇 |
建筑科学 | 2篇 |
能源动力 | 9篇 |
轻工业 | 80篇 |
水利工程 | 2篇 |
无线电 | 41篇 |
一般工业技术 | 34篇 |
冶金工业 | 5篇 |
原子能技术 | 1篇 |
自动化技术 | 28篇 |
出版年
2024年 | 2篇 |
2023年 | 9篇 |
2022年 | 16篇 |
2021年 | 17篇 |
2020年 | 13篇 |
2019年 | 20篇 |
2018年 | 15篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 14篇 |
2014年 | 13篇 |
2013年 | 26篇 |
2012年 | 14篇 |
2011年 | 15篇 |
2010年 | 7篇 |
2009年 | 10篇 |
2008年 | 6篇 |
2007年 | 19篇 |
2006年 | 10篇 |
2005年 | 1篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 5篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有274条查询结果,搜索用时 15 毫秒
271.
Bilal Anjum Ahmed Tahar Laoui Abbas Saeed Hakeem 《Journal of the American Ceramic Society》2023,106(2):1576-1586
The present study reports for the first time the synthesis and evaluation of magnesium (Mg)-doped nitrogen-rich (N-rich) sialon ceramics exploring the possible existence of Mg-stabilized single-phase alpha-sialon (on the Mg-alpha-sialon plane). Mg-stabilized N-rich sialons, with the general formula of MgxSi12−2xAl2xN16 having x value in the range of 0.2–2.2 for the composition laying along the Si3N4–0.5Mg3N2:3AlN line, were synthesized at 1500°C, using nano-size starting powder precursors and field-assisted (or spark plasma) sintering technique. Consolidated sialon ceramic samples were characterized for their microstructure, phase stability regime, and physical and mechanical properties. Although a relatively low synthesis temperature was adopted, well densified sialon samples were achieved; however, the densification of the samples became difficult with a higher x value (containing high Mg3N2/AlN content). Contrary to what was expected to take place, a single-phase Mg-doped sialon was not obtained near the N-rich line (on Mg-alpha-sialon plane). Such distinctive behavior in Mg-doped sialons was supposed to be due to the formation of a highly stable Mg-containing aluminum nitride polytype phase, which consumed most of the high-temperature transient liquid phase. Mg-doped N-rich sialon sample having the maximum amount of alpha phase depicted a remarkable hardness (HV10) of 21.4 GPa and a fracture toughness of 3.5 MPa m1/2. 相似文献
272.
Islam Adeela Anjum Tayaba Khan Nazar 《International Journal on Document Analysis and Recognition》2023,26(3):335-346
International Journal on Document Analysis and Recognition (IJDAR) - Extraction of text lines from handwritten document images is important for downstream text recognition tasks. It is challenging... 相似文献
273.
274.
Cognition, Technology & Work - The underlying relationship dynamics leading to authority gradients between frontline rail workers are being overlooked despite rail incident investigation... 相似文献