全文获取类型
收费全文 | 121篇 |
免费 | 9篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 9篇 |
综合类 | 2篇 |
化学工业 | 27篇 |
金属工艺 | 2篇 |
机械仪表 | 6篇 |
建筑科学 | 5篇 |
能源动力 | 3篇 |
轻工业 | 37篇 |
无线电 | 5篇 |
一般工业技术 | 19篇 |
冶金工业 | 4篇 |
原子能技术 | 6篇 |
自动化技术 | 9篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 6篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2013年 | 22篇 |
2012年 | 1篇 |
2011年 | 2篇 |
2010年 | 5篇 |
2009年 | 7篇 |
2008年 | 5篇 |
2007年 | 5篇 |
2006年 | 4篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 5篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1978年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 3篇 |
1970年 | 1篇 |
排序方式: 共有134条查询结果,搜索用时 0 毫秒
101.
This study presents a novel floating probe method to measure electron temperatures using a hollow cathode-type discharge tube. The proposed method detects a shift in the floating potential when an AC voltage is applied to a probe through an intermediary blocking capacitor.The shift in the floating potential is described as a function of the electron temperature and the applied AC voltage. The floating probe method is simpler than the Langmuir probe method because it does not require the measurement of volt-ampere characteristics. As the input AC voltage increases, the electron temperature converges. The electron temperature measured using the floating probe method with an applied sinusoidal voltage shows a value close to the first(tail)electron temperature in the range of the floating potential. 相似文献
102.
Y. KONDO C. SAKAE M. KUBOTA T. NAGASUE S. SATO 《Fatigue & Fracture of Engineering Materials & Structures》2004,27(5):361-368
This paper proposes a local stress concept to evaluate the fretting fatigue limit for contact edge cracks. A unique S–N curve based on the local stress could be obtained for a contact edge crack irrespective of mechanical factors such as contact pressure, relative slip, contact length, specimen size and loading type. The analytical background for the local stress concept was studied using FEM analysis. It was shown that the local stress uniquely determined the ΔK change due to crack growth as well as the stress distribution near the contact edge. The condition that determined the fretting fatigue limit was predicted by combining the ΔK change due to crack growth and the ΔKth for a short crack. The formation of a non‐propagating crack at the fatigue limit was predicted by the model and it was experimentally confirmed by a long‐life fretting fatigue test. 相似文献
103.
In a deuterium operation on the Large Helical Device,the measurement and control equipment placed in the torus hall must survive under an environment of radiation.To study the effects of gamma-ray irradiation on the equipment,an irradiation experiment is performed at the Cobalt-60 irradiation facility of Nagoya University.Transient and permanent effects on a personal computer,media converters,programmable logic controllers,isolation amplifiers,a web camera,optical flow meters,and water sealing gaskets are experimentally surveyed.Transient noise appears on the web camera.Offset of the signal increases with an increase of the integrated dose on the programmable logic controller.The DeviceNet module on the programmable logic controller is broken at the integrated dose of 72 Gy,which is the expected range of the integrated dose of the torus hall.The other equipment can survive under the gamma-ray field in the torus hall. 相似文献
104.
频率步进方法是探地雷达技术的工作体制之一,与时域无载频脉冲体制的探地雷达技术相比,在探测性能上具有较多的优越性.本文在简述其工作原理的基础上,介绍了作者研制的一种频率步进探地雷达系统,该系统主要用于对地雷目标进行三维成像探测.在研制该雷达系统过程中,对已有的反对称Vivaldi天线提出了改进设计.实验测量结果表明,本文研制的反对称Vivaldi天线与传统的同类天线相比,性能更加优越.同时,为了得到更加清晰的地雷图像,本文还分别引入了f-k偏移成像方法和合成孔经雷达(SAR)处理技术对雷达探测信号进行处理,得到了满意的结果.探测实例表明,频率步进探地雷达系统能够实现对浅层地下地雷目标的高分辨率三维成像探测. 相似文献
105.
水轮机转轮泥沙磨损的数值模拟 总被引:1,自引:0,他引:1
本文利用κ-ε-Ap两组湍流模型计算水轮机转轮中泥沙固液两相湍流。根据液相和固相三维流速场的计算结果数值模拟了转轮叶片面的泥沙磨损。 相似文献
106.
107.
108.
109.
State space is one of the key concepts of systems theory. In the previous paper (Nakano et al. 1987) a system-theoretic framework about the choice of a state space was developed and the canonical forms of linear control theory were interpreted. Four realizations of a single-input and single-output discrete basic linear system were constructed. The isomorphism between the realizations and the universal state space representation shows systemic meanings of the state space. In this paper, using the same approach, two other realizations—a controllability realization and a constructibility realization—are constructed. By the matrix representations of these realizations the meanings of the controllability and constructibility canonical forms are shown in relation to the universal state-space representation. 相似文献
110.
KUNIYOSHI YOKOO TAKEHISA SUZUKI MOHAMAD RAZEGHI NOBUYUKI SATO SHOICHI ONO 《International Journal of Electronics》2013,100(3):645-651
The modified peniotron is expected to have an extremely high conversion efficiency and a higher output power in centimetre and millimetre wave regions than those of the original peniotron. This paper describes the design considerations of a test tube used for experimental confirmation of its promising features, and shows some experimental results in connection with electron beam and oscillation characteristics obtained up to the present 相似文献