全文获取类型
收费全文 | 839篇 |
免费 | 85篇 |
国内免费 | 10篇 |
专业分类
电工技术 | 19篇 |
综合类 | 1篇 |
化学工业 | 326篇 |
金属工艺 | 10篇 |
机械仪表 | 11篇 |
建筑科学 | 24篇 |
能源动力 | 32篇 |
轻工业 | 155篇 |
水利工程 | 10篇 |
石油天然气 | 15篇 |
无线电 | 60篇 |
一般工业技术 | 147篇 |
冶金工业 | 14篇 |
原子能技术 | 7篇 |
自动化技术 | 103篇 |
出版年
2024年 | 2篇 |
2023年 | 24篇 |
2022年 | 68篇 |
2021年 | 84篇 |
2020年 | 57篇 |
2019年 | 79篇 |
2018年 | 68篇 |
2017年 | 81篇 |
2016年 | 72篇 |
2015年 | 44篇 |
2014年 | 60篇 |
2013年 | 76篇 |
2012年 | 43篇 |
2011年 | 47篇 |
2010年 | 27篇 |
2009年 | 28篇 |
2008年 | 16篇 |
2007年 | 12篇 |
2006年 | 11篇 |
2005年 | 5篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1997年 | 1篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有934条查询结果,搜索用时 233 毫秒
31.
Zahra Taherian Mardali Yousefpour Mohammad Tajally Behnam Khoshandam 《International Journal of Hydrogen Energy》2017,42(26):16408-16420
Ni-based/SBA-15 catalysts, were promoted by 3wt % of samaria (Sm2O3), Yttria (Y2O3) and Zirconia (ZrO2), by two-solvent impregnation method. The catalysts characterization was performed by N2 adsorption–desorption, X-ray Diffraction (XRD), X-ray Fluorescence (XRF), High Resolution Transmission Electron Microscopy (HRTEM), Field Emission Electron Scanning Microscopy (FESEM), Temperature Programmed Oxidation/Reduction (TPO/TPR) and NH3-Temperature Programmed Desorption (NH3-TPD) techniques. Then, evaluated by CO2/methane reforming.The CO2/methane reforming outcomes revealed that samaria-promoted catalyst showed excellent activity, stability and cock resistance, while yttria-promoted catalyst just illustrated good activity at high temperature and zirconia-promoted catalyst didn't show any modification in catalytic performance in comparison to Ni-based catalyst with no promoter. Samaria-promoted TEM and TPR analysis, indicated adding samaria improved the NiO particles interaction with SBA-15 support pores wall and NiO dispersion. The TPO analysis displayed that coke deposition in samaria-promoted sample after 12 h reaction is less than yttria-promoted during stream of 5 h. Also, it is suggested that for samaria containing catalyst, cock deposition occurred on the support. Therefore, nickel active sites were preserved for time on stream of 12 h, which is the main reason for samaria-promoted catalyst superior stability than other's. 相似文献
32.
33.
Keyvanpour Mohammad Reza Khanbani Neda Aliniya Zahra 《Multimedia Tools and Applications》2021,80(9):13879-13910
Multimedia Tools and Applications - Auto understanding of human activities in video is an increasing necessity in some application realms. The existing methods for human’s activity... 相似文献
34.
Taheri Mostafa Zhang Chongqi Berardehi Zahra Rasooli Chen Yucheng Roohi Majid 《Multimedia Tools and Applications》2022,81(17):24167-24197
Multimedia Tools and Applications - Synchronization of different Chaotic dynamical systems is one of the main issues in engineering which has a lot of applications in applied sciences like secure... 相似文献
35.
36.
37.
38.
Zahra Bakhtiary Jaleh Barar Ayuob Aghanejad Amir Ata Saei Elhameh Nemati 《Drug development and industrial pharmacy》2017,43(8):1244-1253
Non-small cell lung cancer (NSCLC) patients with sensitizing mutations in the exons 18–21 of the epithelial growth factor receptor (EGFR) gene show increased kinase activity of EGFR. Hence, tyrosine kinase inhibitors (TKIs) such as erlotinib (ETB) have commonly been used as the second line therapeutic option for the treatment of metastatic NSCLC. While the ETB is available as an oral dosage form, the local delivery of this TKI to the diseased cells of the lung may ameliorate its therapeutic impacts. In the current study, we report on the development of ETB-loaded solid lipid nanoparticle (SLN) based formulation of dry powder inhaler (ETB-SLN DPI). ETB-SLNs were formulated using designated amount of compritol/poloxamer 407. The engineered ETB-SLNs showed sub-100?nm spherical shape with an encapsulation efficiency of 78.21%. MTT assay and DAPI staining revealed that the ETB-SLNs enhanced the cytotoxicity of cargo drug molecules in the human alveolar adenocarcinoma epithelial A549 cells as a model for NSCLC. To attain the ETB-SLN DPI, the ETB-SLNs were efficiently spray dried into microparticles (1–5?μm) along with mannitol. The ETB-SLN DPI powder displayed suitable flowability and aerodynamic traits. The Carr's Index, Hausner ratio and Next Generation Impactor (NGI) analyses confirmed deep inhalation pattern of the formulation. Based on these findings, we propose the ETB-SLN DPI as a promising treatment modality for the NSCLC patients. 相似文献
39.
Glucose oxidase effect on treatment of textile effluent containing reactive azo dyes by Phanerochaete chrysosporium 下载免费PDF全文
40.