全文获取类型
收费全文 | 754篇 |
免费 | 38篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 25篇 |
综合类 | 2篇 |
化学工业 | 163篇 |
金属工艺 | 16篇 |
机械仪表 | 23篇 |
建筑科学 | 14篇 |
矿业工程 | 2篇 |
能源动力 | 24篇 |
轻工业 | 53篇 |
水利工程 | 9篇 |
无线电 | 79篇 |
一般工业技术 | 205篇 |
冶金工业 | 79篇 |
原子能技术 | 9篇 |
自动化技术 | 94篇 |
出版年
2024年 | 6篇 |
2023年 | 11篇 |
2022年 | 16篇 |
2021年 | 29篇 |
2020年 | 27篇 |
2019年 | 30篇 |
2018年 | 36篇 |
2017年 | 31篇 |
2016年 | 21篇 |
2015年 | 17篇 |
2014年 | 29篇 |
2013年 | 58篇 |
2012年 | 39篇 |
2011年 | 44篇 |
2010年 | 38篇 |
2009年 | 37篇 |
2008年 | 29篇 |
2007年 | 32篇 |
2006年 | 30篇 |
2005年 | 33篇 |
2004年 | 12篇 |
2003年 | 16篇 |
2002年 | 16篇 |
2001年 | 7篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 10篇 |
1997年 | 12篇 |
1996年 | 13篇 |
1995年 | 13篇 |
1994年 | 9篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1991年 | 11篇 |
1990年 | 2篇 |
1989年 | 10篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 2篇 |
1976年 | 1篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1970年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有797条查询结果,搜索用时 15 毫秒
791.
Pradhan Smruti Ranjan Singh Rupinder Banwait Sukhwant Singh 《Journal of Mechanical Science and Technology》2022,36(8):4197-4203
Journal of Mechanical Science and Technology - DMLS is one of the established metal powder-based 3D printing technologies commercially used for customized DC and implants for human dentistry... 相似文献
792.
Mohammed Sayyad Ying Qin Jan Kopaczek Adway Gupta Naim Patoary Shantanu Sinha Emmie Benard Austin Davis Kentaro Yumigeta Cheng-Lun Wu Han Li Shize Yang Ivan Sanchez Esqueda Arunima Singh Sefaattin Tongay 《Advanced functional materials》2023,33(42):2303526
2D Janus transition metal dichalcogenides (TMDs) have attracted attention due to their emergent properties arising from broken mirror symmetry and self-driven polarization fields. While it has been proposed that their vdW superlattices hold the key to achieving superior properties in piezoelectricity and photovoltaic, available synthesis has ultimately limited their realization. Here, the first packed vdW nanoscrolls made from Janus TMDs through a simple one-drop solution technique are reported. The results, including ab initio simulations, show that the Bohr radius difference between the top sulfur and the bottom selenium atoms within Janus (M = Mo, W) results in a permanent compressive surface strain that acts as a nanoscroll formation catalyst after small liquid interaction. Unlike classical 2D layers, the surface strain in Janus TMDs can be engineered from compressive to tensile by placing larger Bohr radius atoms on top (to yield inverted C scrolls. Detailed microscopy studies offer the first insights into their morphology and readily formed Moiré lattices. In contrast, spectroscopy and FETs studies establish their excitonic and device properties and highlight significant differences compared to 2D flat Janus TMDs. These results introduce the first polar Janus TMD nanoscrolls and introduce inherent strain-driven scrolling dynamics as a catalyst to create superlattices. 相似文献
793.
Shantanu Sen Dr. Rafat Ali Akanksha Onkar Prof. Dr. Subramaniam Ganesh Prof. Dr. Sandeep Verma 《Chembiochem : a European journal of chemical biology》2022,23(11):e202100678
The discovery of insulin came with very high hopes for diabetic patients. In 2021, the world celebrated the 100th anniversary of the discovery of this vital hormone. However, external use of insulin is highly affected by its aggregating tendency that occurs during its manufacturing, transportation, and improper handling which ultimately leads to its pharmaceutically and biologically ineffective form. In this review, we aim to discuss the various approaches used for decelerating insulin aggregation which results in the enhancement of its overall structural stability and usage. The approaches that are discussed are broadly classified as either a measure through excipient additions or by intrinsic modifications in the insulin native structure. 相似文献
794.
Silicon - Miniaturization of the semiconducting materials propelled the discovery of low dimensional transition metal dichalcogenides (TMDC) thin films. In this work, MoS2 thin films have been... 相似文献
795.
Rahul Chandra Pradhan Abhishek Gautam Tripathy Kumar Shantanu Prasad Barada Prasanna Sahoo Diptikanta Das Ramanuj Kumar 《Materialwissenschaft und Werkstofftechnik》2023,54(8):986-1002
Multiwall carbon nanotube buttressed aluminium 7075 metal matrix composite was synthesized through an amended liquid metallurgy method, which consisted semisolid stirring, ultrasonic treatment and squeeze casting. Aim was to investigate its machinability and surface morphology during electrical discharge machining. Variable machining factors were peak current, pulse-on time and gap voltage, whereas the responses under investigation were electrode wear rate, material removal rate and average surface roughness. Results revealed electrode wear rate, material wear rate and average surface roughness increased on increasing peak current and pulse-on time, but all these responses behaved inversely with the increase of gap voltage. Average surface roughness reduced by around 44 % on reducing the peak current from 10 A to 4 A and increasing gap voltage from 55 V to 80 V at constant pulse-on time of 300 μs; however, it increased by around 25 % on reducing the gap voltage from 80 V to 55 V and increasing the pulse-on time from 100 μs to 300 μs at constant peak current of 10 A. Significance of the process parameters were verified, regression models were developed and morphology of the machined surfaces was studied. Finally, multiple response optimization was conducted following grey relational approach. 相似文献
796.
Anand Rahul Nayak Bibhuti B. Behera Shantanu K. 《Journal of Inorganic and Organometallic Polymers and Materials》2022,32(9):3546-3555
Journal of Inorganic and Organometallic Polymers and Materials - The current investigation describes the synthesis of SiTiCNO ceramics derived from the mixture of a preceramic polymer... 相似文献
797.
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