全文获取类型
收费全文 | 735篇 |
免费 | 47篇 |
学科分类
工业技术 | 782篇 |
出版年
2024年 | 1篇 |
2023年 | 19篇 |
2022年 | 33篇 |
2021年 | 38篇 |
2020年 | 37篇 |
2019年 | 33篇 |
2018年 | 42篇 |
2017年 | 57篇 |
2016年 | 55篇 |
2015年 | 23篇 |
2014年 | 33篇 |
2013年 | 60篇 |
2012年 | 39篇 |
2011年 | 45篇 |
2010年 | 45篇 |
2009年 | 31篇 |
2008年 | 13篇 |
2007年 | 18篇 |
2006年 | 18篇 |
2005年 | 14篇 |
2004年 | 11篇 |
2003年 | 15篇 |
2002年 | 12篇 |
2001年 | 6篇 |
2000年 | 6篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 8篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有782条查询结果,搜索用时 5 毫秒
781.
Gayatri Deepaksingh Hazare Soumya Sucharita Pradhan Nilima Dash Ranjan Kumar Dwari 《加拿大化工杂志》2023,101(6):3074-3093
The present paper outlines the characterization, electrokinetic behaviour, and flotation response of rejected coking coal fines with 32.5% ash generated in a coal washery in Eastern India. The response methodology and central composite rotatable design (RSM-CCRD) were used for the process modelling and optimization of the flotation process using diesel, methyl isobutyl carbinol (MIBC), and sodium hexametaphosphate as a collector, frother, and depressant to maximize ash reduction, yield, and combustible recovery. At optimum condition, a 9.7% clean ash coal was achieved with a 63% yield at collector, frother, and depressant dosages of 0.78, 0.31, and 0.80 kg/ton, respectively. The model prediction and experimental data corroborated sufficiently. Subsequently, within 1 year, the fines oxidized and did not float with the collector. Fourier-transform infrared spectroscopy (FTIR) confirmed surface oxidation on oxidized coal. The oxidized coal responded favourably to acid oil, a vegetable oil refinery waste. With acid oil as a collector, the oxidized coal can upgrade to 12% clean ash coal with a 60% yield; the combustible recovered is 80%. The work indicates successful upgradation of fresh and oxidized coal using the froth flotation process. 相似文献
782.
Meixia Zhou Tapas Ranjan Behera Beilei Xu Quanquan Shen 《Hemodialysis international. International Symposium on Home Hemodialysis》2023,27(1):E9-E11
Patients with end-stage renal disease require to establish vascular access for regular hemodialysis. The creation of arteriovenous fistula (AVF) is usually a safe procedure; however, there could be complications such as bleeding, hematoma, pseudoaneurysm, thrombosis, infection, and steal syndrome. A rare complication of such vascular manipulation could be formation of lymphocele. We present a case of a 67-year-old man who presented with a progressively enlarging mass 12 days after the surgery for AVF creation at the site of surgery in the right upper arm. Ultrasonographic examination revealed a fluid-filled cystic structure measuring about 4.2 × 3.6 × 1.9 cm under the skin just above the anastomosis. The fluid was aspirated using ultrasound-guided fluoroscopy that relieved the swelling. The analysis of aspirate suggested the cyst to be a lymphocele. The mass re-enlarged to its previous size in the next 3 days. While under observation for signs of complication, regular intermittent compression and a low-fat diet completely resolved the lymphocele over the subsequent 3 months. The less common occurrence of such lymphocele post AVF creation needs to be evaluated for its potential for complication, in the absence of which the lymphocele is amenable to conservative management using regular intermittent compression and low-fat oral diet. 相似文献