全文获取类型
收费全文 | 4539篇 |
免费 | 88篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 219篇 |
综合类 | 7篇 |
化学工业 | 735篇 |
金属工艺 | 1610篇 |
机械仪表 | 66篇 |
建筑科学 | 46篇 |
矿业工程 | 1篇 |
能源动力 | 108篇 |
轻工业 | 191篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 370篇 |
一般工业技术 | 475篇 |
冶金工业 | 460篇 |
原子能技术 | 104篇 |
自动化技术 | 234篇 |
出版年
2023年 | 14篇 |
2022年 | 28篇 |
2021年 | 46篇 |
2020年 | 25篇 |
2019年 | 29篇 |
2018年 | 29篇 |
2017年 | 37篇 |
2016年 | 56篇 |
2015年 | 40篇 |
2014年 | 65篇 |
2013年 | 196篇 |
2012年 | 138篇 |
2011年 | 176篇 |
2010年 | 135篇 |
2009年 | 155篇 |
2008年 | 201篇 |
2007年 | 161篇 |
2006年 | 155篇 |
2005年 | 138篇 |
2004年 | 111篇 |
2003年 | 145篇 |
2002年 | 178篇 |
2001年 | 143篇 |
2000年 | 127篇 |
1999年 | 155篇 |
1998年 | 267篇 |
1997年 | 226篇 |
1996年 | 180篇 |
1995年 | 117篇 |
1994年 | 129篇 |
1993年 | 177篇 |
1992年 | 167篇 |
1991年 | 155篇 |
1990年 | 61篇 |
1989年 | 50篇 |
1988年 | 41篇 |
1987年 | 41篇 |
1986年 | 42篇 |
1985年 | 39篇 |
1984年 | 52篇 |
1983年 | 40篇 |
1982年 | 24篇 |
1981年 | 33篇 |
1980年 | 24篇 |
1979年 | 21篇 |
1978年 | 14篇 |
1977年 | 7篇 |
1976年 | 18篇 |
1974年 | 5篇 |
1973年 | 6篇 |
排序方式: 共有4630条查询结果,搜索用时 46 毫秒
1.
Wesley P. Chan Hiroto Mizohana Xiangyu Chen Yasuto Shiigi Yoshiyuki Yamanoue Masaki Nagatsuka Masayuki Inaba 《野外机器人技术杂志》2019,36(1):17-33
The use of field robots can greatly decrease the amount of time, effort, and associated risk compared to if human workers were to carryout certain tasks such as disaster response. However, transportability and reliability remain two main issues for most current robot systems. To address the issue of transportability, we have developed a lightweight modularizable platform named AeroArm. To address the issue of reliability, we utilize a multimodal sensing approach, combining the use of multiple sensors and sensor types, and the use of different detection algorithms, as well as active continuous closed‐loop feedback to accurately estimate the state of the robot with respect to the environment. We used Challenge 2 of the 2017 Mohammed Bin Zayed International Robotics Competition as an example outdoor manipulation task, demonstrating the capabilities of our robot system and approach in achieving reliable performance in the fields, and ranked fifth place internationally in the competition. 相似文献
2.
The World robot summit disaster robotics category – achievements of the 2018 preliminary competition
Satoshi Tadokoro Tetsuya Kimura Masayuki Okugawa Katsuji Oogane Hiroki Igarashi Yoshikazu Ohtsubo 《Advanced Robotics》2019,33(17):854-875
The World Robot Summit is a robot Olympics and aims to be held in a different country every four years from 2020. The concept of the Plant Disaster Prevention challenge is daily inspections, checks, and emergency response in industrial plants, and in this competition, robots must carry out these types of missions in a mock-up plant. The concept of the Tunnel Disaster Response and Recovery challenge is emergency response to tunnel disasters, and is a simulation competition whereby teams compete to show their ability to deal with disasters, by collecting information and removing debris. The Standard Disaster Robotics challenge assesses, in the form of a contest, the standard performance levels of a robot that are necessary for disaster prevention and emergency response. The World Robot Summit Preliminary Competition was held at Tokyo Big Sight in October 2018, and 36 teams participated in the Disaster Robotics Category. UGVs and UAVs contended the merits of new technology for solving complex problems, using core technologies such as mobility, sensing, recognition, performing operations, human interface, autonomous intelligence etc., as well as system integration and implementation of strategies for completing missions, gaining high-level results. 相似文献
3.
4.
5.
6.
7.
Masami Ikeda Susumu Fukumoto Hiroshi Takao Shinya Ohtsuka Eiichi Haginomori Masayuki Hikita 《Electrical Engineering in Japan》2002,141(4):16-24
This paper describes the dielectric breakdown characteristics of oil and oil‐impregnated paper for very fast transient (VFT) voltages. Blumlein circuits generate VFT voltages of 60 and 300 ns in a pulse width that simulates disconnecting switching surges in gas‐insulated switch gears. We measured the breakdown voltages of needle‐to‐plane, plane‐to‐plane oil gaps and several pieces of paper between plane electrodes for VFT and lightning impulse voltages. The measured data were formulated in V‐t characteristics and Weibull probability distributions. The inclination n of V‐t characteristics of insulating paper is 150, which is less than n = 13.7 of the plane‐to‐plane oil gap in the VFT time range. The shape parameters of Weibull distribution obtained in this study show that the scattering of breakdown voltages of paper is much less than that of oil. © 2002 Wiley Periodicals, Inc. Electr Eng Jpn, 141(4): 16–24, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10043 相似文献
8.
H. Okamoto 《Journal of Phase Equilibria and Diffusion》2002,23(4):384-385
9.
10.
1-GHz-spaced 16-channel arrayed-waveguide grating for a wavelength reference standard in DWDM network systems 总被引:3,自引:0,他引:3
We fabricated a 1-GHz-spaced 16-channel arrayed-waveguide grating (AWG) by using a new AWG configuration where the path of each arrayed waveguide winds backward and forward across a 4-in diameter wafer without crossing any other waveguides. The ultra-narrow (< 1 GHz) and stable transmission bands of this AWG can be used to construct a wavelength reference standard covering the S, C, and L bands in the dense wavelength-division-multiplexing network systems whose frequency deviation is /spl plusmn/160 MHz. 相似文献