全文获取类型
收费全文 | 784篇 |
免费 | 49篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 7篇 |
综合类 | 2篇 |
化学工业 | 226篇 |
金属工艺 | 16篇 |
机械仪表 | 28篇 |
建筑科学 | 14篇 |
矿业工程 | 1篇 |
能源动力 | 50篇 |
轻工业 | 44篇 |
水利工程 | 1篇 |
石油天然气 | 5篇 |
无线电 | 105篇 |
一般工业技术 | 144篇 |
冶金工业 | 41篇 |
原子能技术 | 3篇 |
自动化技术 | 148篇 |
出版年
2024年 | 3篇 |
2023年 | 20篇 |
2022年 | 62篇 |
2021年 | 47篇 |
2020年 | 52篇 |
2019年 | 32篇 |
2018年 | 54篇 |
2017年 | 51篇 |
2016年 | 40篇 |
2015年 | 31篇 |
2014年 | 37篇 |
2013年 | 58篇 |
2012年 | 41篇 |
2011年 | 38篇 |
2010年 | 36篇 |
2009年 | 23篇 |
2008年 | 40篇 |
2007年 | 25篇 |
2006年 | 17篇 |
2005年 | 8篇 |
2004年 | 16篇 |
2003年 | 3篇 |
2002年 | 5篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 10篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1988年 | 2篇 |
1986年 | 5篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 6篇 |
1982年 | 2篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有835条查询结果,搜索用时 31 毫秒
831.
Davis Rahul Singh Abhishek Amorim Fred Lacerda Jackson Mark James Sales Wisley Falco 《SILICON》2022,14(1):27-45
Silicon - The manufacturing of hybrid metal matrix composites (HMMCs) combines two or more reinforcing materials exhibiting distinct properties, with a steady metal matrix phase. Such combinations... 相似文献
832.
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
833.
Nigam Kaushal Kondekar PN Chandan Bandi Venkata Kumar Satyendra Tikkiwal Vinay Anand Dharmender Singh Km. Sucheta Bhardwaj Eshaan Choubey Shubham Chaturvedi Savitesh 《SILICON》2022,14(4):1549-1558
Silicon - To overcome the fabrication complexity and achieve a better switching ratio is a major grave concern for applications in semiconductor devices. In this regards, a novel stack gate-oxide... 相似文献
834.
Dutt Arya Tiwari Sanjana Upadhyay Abhishek Kumar Mathew Ribu Beohar Ankur 《SILICON》2022,14(15):9789-9796
Silicon - This paper comprises of design and analysis of novel gate all around (GAA) cylindrical tunnel field effect transistor (TFET) using technology computer aided designing (TCAD) tool. The... 相似文献
835.
Abhishek Srivastava Radhey Mohan Naik Jyoti Rai Indresh Kumar Bushra Yaseen Chinky Gangwar 《Journal of surfactants and detergents》2023,26(1):13-22
The kinetic investigation of Hg(II)-promoted reaction between [Fe(CN)6]4− and 2,2′-bipyridine (Bipy) has been performed in anionic sodium dodecyl sulfate (SDS) micellar medium by recording the surge in absorbance at 400 nm, corresponding to ultimate reaction product [Fe(CN)4 Bipy]2− using UV–visible spectrophotometer. Pseudo-first-order condition has been used to examine the progress of reaction as a function of temperature, [Fe(CN)64−], ionic strength, [SDS], pH, [Hg2+], and [Bipy] by changing one parameter at a time. The results exhibit that [Hg2+], [SDS], and pH are the decisive parameter showing maximum reaction rate at 1.5 × 10−4 mol dm−3, 6.0 × 10−3 mol dm−3, and 3.8, respectively. [Fe(CN)6]4− does not show any appreciable effect on the critical micellar concentration (CMC) of SDS as the polar head of SDS and [Fe(CN)6]4− both are negatively charged. Variable order kinetics was observed for [Fe(CN)6]4− and Bipy in their examined concentration range. The reverse response observed in the reaction rate with [KNO3] shows a negative salt effect. The K+ provided by K4[Fe(CN)6] and KNO3 decreases the repulsion between the negatively charged heads of the surfactant molecules thereby decreasing the CMC of SDS. The negative value for the entropy of activation also supports the interchange dissociative (Id) mechanism recommended by us. 相似文献