全文获取类型
收费全文 | 98篇 |
免费 | 6篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 22篇 |
金属工艺 | 5篇 |
机械仪表 | 2篇 |
建筑科学 | 1篇 |
能源动力 | 6篇 |
轻工业 | 4篇 |
水利工程 | 1篇 |
无线电 | 23篇 |
一般工业技术 | 19篇 |
冶金工业 | 1篇 |
自动化技术 | 19篇 |
出版年
2023年 | 2篇 |
2022年 | 8篇 |
2021年 | 9篇 |
2020年 | 7篇 |
2019年 | 7篇 |
2018年 | 9篇 |
2017年 | 8篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 7篇 |
2012年 | 2篇 |
2011年 | 7篇 |
2009年 | 2篇 |
2008年 | 6篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
1991年 | 1篇 |
排序方式: 共有104条查询结果,搜索用时 0 毫秒
101.
Abstract—Autonomy of light electric vehicles with limited mobility can be improved by assisting onboard energy sources, such as battery and ultra-capacitors, by solar energy. This article discusses the integration of a photovoltaic panel with an electric city car. The Photovoltaic Geographical Information Systems of Joint Research Center, Europe, is used for estimating the solar irradiance. Based on the estimations, a DC-to-DC boost converter topology is considered to interface the panel with the DC bus of the electric car. Experimental evaluation of the performance is carried out under a real climatic situation. An analytical loss model is used to comment on the associated losses and to explain the measured changes in gain and efficiency under varying irradiance. Acceptable extension in the autonomy of the electric city car is predicted from the results. 相似文献
102.
Ritesh Urade Yan-Hui Chiu Chien-Chih Chiu Chang-Yi Wu 《International journal of molecular sciences》2022,23(9)
Members of the Ras superfamily have been found to perform several functions leading to the development of eukaryotes. These small GTPases are divided into five major subfamilies, and their regulators can “turn on” and “turn off” signals. Recent studies have shown that this superfamily of proteins has various roles in the process of vascular development, such as vasculogenesis and angiogenesis. Here, we discuss the role of these subfamilies in the development of the vascular system in zebrafish. 相似文献
103.
Vijay Singh Bhadouria Monika Agrawal Ritesh Kumar 《International Journal of Communication Systems》2023,36(18):e5616
Developing a reliable and robust underwater acoustic communication system is a difficult task due to the complicated nature of the underwater channel, non-stationary noise, and several other factors. Indeed, channel estimation or equalization presents numerous challenges in this non-stationary, highly Doppler, multipath environment; as a result, traditional equalizers and PLL-based methods have limited performance. Generally, communication over such time-varying channels is accomplished via packets that contain a prefix/preamble signal for training, a payload containing the actual data, and a silent period for proper alignment. The prefix signal must be designed properly because it is used to estimate the channel and determine the start of the packet. In this paper, we propose a new prefix signal based on the hyperbolic chirp signal, which has Doppler invariance properties. These properties enable the extraction of the entire packet even under severe multipath and Doppler. Our new proposed prefix signal can accurately and efficiently characterize an underwater channel by estimating the multipath delay, amplitude, and Doppler scales. Our new method has been validated through extensive simulations using various channel models for its robustness and effectiveness under various conditions. It has also been tested on a real-world channel. 相似文献
104.
Kumar Amit Asoria Saisaurabh Chaudhary Rubina Kumar Rakesh Vijay Ritesh 《Clean Technologies and Environmental Policy》2023,25(4):1397-1405
Clean Technologies and Environmental Policy - Hydropower contributes around 13% of the total renewable power generation in India. Hydraulic power plants are dependent on diversion... 相似文献