全文获取类型
收费全文 | 203篇 |
免费 | 11篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 3篇 |
综合类 | 1篇 |
化学工业 | 53篇 |
金属工艺 | 10篇 |
机械仪表 | 4篇 |
建筑科学 | 6篇 |
能源动力 | 10篇 |
轻工业 | 26篇 |
水利工程 | 4篇 |
石油天然气 | 16篇 |
无线电 | 16篇 |
一般工业技术 | 32篇 |
冶金工业 | 7篇 |
原子能技术 | 3篇 |
自动化技术 | 28篇 |
出版年
2023年 | 2篇 |
2022年 | 9篇 |
2021年 | 15篇 |
2020年 | 6篇 |
2019年 | 18篇 |
2018年 | 17篇 |
2017年 | 10篇 |
2016年 | 9篇 |
2015年 | 11篇 |
2014年 | 16篇 |
2013年 | 19篇 |
2012年 | 10篇 |
2011年 | 18篇 |
2010年 | 8篇 |
2009年 | 9篇 |
2008年 | 5篇 |
2007年 | 9篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有219条查询结果,搜索用时 31 毫秒
51.
52.
Gas–solid flow in a pipe with different configurations (vertical, horizontal, and inclined positions) is studied experimentally. Air with temperature around 170°C and sand particles with mean diameter of 253 μm are used as gas and solid mediums, respectively. Effects of different parameters (pipe slope and solid particles feed rate) are studied on heat transfer rate between gas and solid particles. The Nusselt number decreases at lower solids feed rate in a dilute regime of the mixture; however, it increases at higher solids feed rates. Furthermore, results show that a higher Nusselt number takes place at the angles closer to 45 degrees. 相似文献
53.
Estimating shear stress in a rectangular channel with rough boundaries using an optimized SVM method
Khozani Zohreh Sheikh Bonakdari Hossein Zaji Amir Hossein 《Neural computing & applications》2018,30(8):2555-2567
Neural Computing and Applications - The accurate simulation of wall and bed shear stresses in rectangular channels is one of the most important topics in hydraulic engineering. In this study, the... 相似文献
54.
55.
Bernard Carpentier Arnd Wilhelms G. Ali Mansoori 《Journal of Petroleum Science and Engineering》2007,58(3-4):341
This Special Issue of the “Journal of Petroleum Science and Engineering” is devoted to organic geochemistry and published in honor of Dr Alain-Yves Huc. Alain has been involved in promoting and developing reservoir geochemistry as a tool in the field development and exploitation problem solving toolbox. This volume includes general papers on the potential interest of organic geochemistry for production purposes and discusses some physical processes such as hydrocarbon/water interactions and TSR (Thermochemical Sulfate Reduction). It presents new analytical techniques and shows industrial field applications, demonstrating the potential contribution of organic geochemistry in enhancing hydrocarbon production. 相似文献
56.
57.
58.
59.
Zohreh Sajadi Hezaveh Masoumeh Khalighi Sikaroudi Mohammadreza Vafa Zachary Stephen Clayton Sepideh Soltani 《Journal of the science of food and agriculture》2019,99(15):6663-6670
There is little evidence about whether eggs affect inflammation. The aim of this meta-analysis was to explore the effects of egg consumption on inflammation. A systematic search of online databases (Institute for Scientific Information (ISI), Scopus, Ovid, PubMed, Cochrane) was used to gather clinical trials that assessed the effect of egg consumption on circulating inflammatory biomarkers. Using a random-effects model, pooled weighted mean differences (WMD) and corresponding standard deviations (SD) were calculated. Of the 21 eligible studies found, nine trials were eligible for analysis. Eight trials assessed high-sensitivity C-reactive protein (hs-CRP), four trials assessed interleukin-6 (IL-6), and five trials assessed tumor necrosis factor-alpha (TNF-α). Egg consumption did not affect hs-CRP (WMD 0.24 mg/L; 95% CI: -0.43, 0.90; I2 = 53.8; P = 0.48), IL-6 (WMD 0.20 pg/mL; 95% CI: -0.71, 1.11; I2 = 69.3; P = 0.50), and TNF-α (WMD: -0.38 pg/mL; 95% CI: -0.87, 0.10; I2 = 0.00; P = 0.12) relative to controls. Overall, this meta-analysis revealed that egg consumption had no significant effect on serum biomarkers of inflammation in adults. © 2019 Society of Chemical Industry 相似文献
60.