全文获取类型
收费全文 | 599篇 |
免费 | 16篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 8篇 |
化学工业 | 109篇 |
金属工艺 | 12篇 |
机械仪表 | 8篇 |
建筑科学 | 6篇 |
能源动力 | 17篇 |
轻工业 | 28篇 |
水利工程 | 1篇 |
无线电 | 95篇 |
一般工业技术 | 135篇 |
冶金工业 | 70篇 |
原子能技术 | 1篇 |
自动化技术 | 127篇 |
出版年
2023年 | 6篇 |
2022年 | 13篇 |
2021年 | 16篇 |
2020年 | 17篇 |
2019年 | 15篇 |
2018年 | 13篇 |
2017年 | 7篇 |
2016年 | 10篇 |
2015年 | 12篇 |
2014年 | 17篇 |
2013年 | 40篇 |
2012年 | 22篇 |
2011年 | 33篇 |
2010年 | 21篇 |
2009年 | 27篇 |
2008年 | 20篇 |
2007年 | 21篇 |
2006年 | 24篇 |
2005年 | 17篇 |
2004年 | 22篇 |
2003年 | 17篇 |
2002年 | 20篇 |
2001年 | 5篇 |
2000年 | 10篇 |
1999年 | 15篇 |
1998年 | 16篇 |
1997年 | 18篇 |
1996年 | 14篇 |
1995年 | 19篇 |
1994年 | 14篇 |
1993年 | 5篇 |
1992年 | 8篇 |
1991年 | 14篇 |
1990年 | 2篇 |
1989年 | 6篇 |
1988年 | 6篇 |
1986年 | 2篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1977年 | 6篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1972年 | 3篇 |
1971年 | 2篇 |
1969年 | 3篇 |
排序方式: 共有617条查询结果,搜索用时 78 毫秒
101.
Single crystals of CulnS2, CulnSe2, CulnTe2, CuGaS2, AgGaS2 CulnSSe, AgGaSSe have been grown by chemical vapour transport technique on the basis of a new general thermodynamical model which enables the minimum source temperature T
s, and the minimum deposition temperature, T
d, to be determined. X-ray analysis, X-ray photoelectron spectroscopic analysis, surface analysis, and microhardness studies have been carried out on the single crystals grown. 相似文献
102.
Commercial 50 and 100 kD polyethersulfone (PES) and polysulfone (PS) ultrafiltration membranes were surface modified by UV photografting of poly(ethylene glycol) methacrylate (PEGMA) monomer. The modified membranes were characterized by the degree of grafting, water flux and molecular weight cutoff (MWCO) rating. The flux and fouling of the modified and unmodified membranes were examined with sugarcane juice and its polysaccharide fraction. Under the conditions of this study, the modified membranes displayed a low degree of grafting (26-36 μg/cm2), which was independent of the UV exposure duration; however, both membrane water flux and MWCO rating were affected by the irradiation time. In the best case, the modified membranes exhibited lower fouling with sugarcane juice; furthermore, the propensity to foul also decreased. More significantly, juice flux recovery was almost complete for successive UF-cleaning cycles. 相似文献
103.
An instrumented data glove with a wireless interface provides convenient and natural human-computer interaction for people with speech or hearing impairments. 相似文献
104.
Rebecca L. Tarnopol Sierra Bowden Kevin Hinkle Krithika Balakrishnan Akira Nishii Caleb J. Kaczmarek Tara Pawloski Dr. Anthony G. Vecchiarelli 《Chembiochem : a European journal of chemical biology》2019,20(20):2535-2545
One of the primary challenges facing synthetic biology is reconstituting a living system from its component parts. A particularly difficult landmark is reconstituting a self-organizing system that can undergo autonomous chromosome compaction, segregation, and cell division. Here, we discuss how the syn3.0 minimal genome can inform us of the core self-organizing principles of a living cell and how these self-organizing processes can be built from the bottom up. The review underscores the importance of fundamental biology in rebuilding life from its molecular constituents. 相似文献
105.
Measurement Techniques - We propose the principle of operation of a special flowmeter of accumulative type and develop its design and electric circuit. This device is intended for the automatic... 相似文献
106.
Joy Jestin Balakrishnan Kannan Madhavankutty Sreeraj 《Universal Access in the Information Society》2022,21(3):717-723
Universal Access in the Information Society - Lack of Sign Language-based learning tools is a hindrance in acquiring knowledge for deaf students. Technology-based tools have introduced innovative... 相似文献
107.
Vimala Balakrishnan 《Telematics and Informatics》2018,35(5):1190-1200
This paper examined the emotional reactions and actions involving cyberbullying, focusing on the cyber bullies, victims, bully-victims and bystanders. Gender analysis was conducted to examine if males and females behave and react differently. Self-administered surveys were used to gather data from a large sample of 1158 young adults, mostly university students in Malaysia (Mage?=?21.0?years; SD?=?2.16). Findings indicate the presence of cyberbullying perpetration after the schooling years, with 8% (N?=?93) bullying, 18.6% (N?=?216) victimization, 15.2% (N?=?174) bullying and victimization, and 53.4% (N?=?675) witnessing a cyberbullying incident in the past one year. Most of the bullies reported to be remorseful; however the majority did nothing after a perpetration. Most of the victims on the other hand, experienced anger, sadness and depression after a victimization with the majority claiming to have defended themselves (75%). The majority of the bully-victims regretted their actions, pitied the victims and felt angry after a cyberbullying perpetration/victimization. Bystanders mostly reported feeling pity for the victim and angry at the bullies, with the majority (61.5%) claiming to have defended the victims. However, 40% of them behaved indifferently out of fear retaliation. Finally, gender analysis revealed females to have significantly experienced more emotions than males whereas more males did nothing after a cyberbullying incident, both as victims and bystanders. 相似文献
108.
The Journal of Supercomputing - Building sentiment analysis resources is a fundamental step before developing any sentiment analysis model. Sentiment lexicons are one of these critical resources.... 相似文献
109.
110.