全文获取类型
收费全文 | 1537篇 |
免费 | 39篇 |
国内免费 | 9篇 |
专业分类
电工技术 | 111篇 |
综合类 | 2篇 |
化学工业 | 386篇 |
金属工艺 | 49篇 |
机械仪表 | 35篇 |
建筑科学 | 27篇 |
矿业工程 | 1篇 |
能源动力 | 105篇 |
轻工业 | 85篇 |
水利工程 | 8篇 |
石油天然气 | 6篇 |
无线电 | 154篇 |
一般工业技术 | 331篇 |
冶金工业 | 101篇 |
原子能技术 | 72篇 |
自动化技术 | 112篇 |
出版年
2022年 | 16篇 |
2021年 | 13篇 |
2020年 | 5篇 |
2019年 | 17篇 |
2018年 | 20篇 |
2017年 | 14篇 |
2016年 | 30篇 |
2015年 | 17篇 |
2014年 | 30篇 |
2013年 | 67篇 |
2012年 | 62篇 |
2011年 | 68篇 |
2010年 | 70篇 |
2009年 | 67篇 |
2008年 | 63篇 |
2007年 | 68篇 |
2006年 | 56篇 |
2005年 | 49篇 |
2004年 | 56篇 |
2003年 | 45篇 |
2002年 | 58篇 |
2001年 | 45篇 |
2000年 | 48篇 |
1999年 | 37篇 |
1998年 | 57篇 |
1997年 | 38篇 |
1996年 | 38篇 |
1995年 | 34篇 |
1994年 | 29篇 |
1993年 | 27篇 |
1992年 | 20篇 |
1991年 | 16篇 |
1990年 | 15篇 |
1989年 | 14篇 |
1988年 | 19篇 |
1987年 | 16篇 |
1986年 | 14篇 |
1985年 | 27篇 |
1984年 | 25篇 |
1983年 | 28篇 |
1982年 | 25篇 |
1981年 | 21篇 |
1980年 | 19篇 |
1979年 | 16篇 |
1978年 | 17篇 |
1977年 | 13篇 |
1976年 | 7篇 |
1975年 | 9篇 |
1973年 | 5篇 |
1971年 | 4篇 |
排序方式: 共有1585条查询结果,搜索用时 15 毫秒
41.
An artificial olfactory, which is called an electronic nose system (e-nose), is studied for realizing new human–machine interface. The system consists of sensor unit and a signal processing unit. There are some types of sensors for the sensor unit, metal oxide semiconductor gas sensors (MOGS) and quartz crystal microbalance gas sensors are useful in our study. Our system in this paper has MOGS. Many of MOGS utilize an effect of an oxidation–reduction reaction on the surface of the sensors. One of the features of the sensor, the character of the sensor is changed by temperature of the sensors. In this paper, we build a extend output sensor unit using this feature, and show experimental result of classification applying multilayer perceptron. In the experiment, we choose soy sauce as classification targets because we are considering applying the system for management of cooked foods. 相似文献
42.
Voltage Control of Static Var Compensator for a Remote System Interconnected by Long‐Distance AC Cables
下载免费PDF全文
![点击此处可从《Electrical Engineering in Japan》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Yuji Tamura Shinji Takasaki Yasuyuki Miyazaki Hideo Takeda Shoichi Irokawa Kikuo Takagi Naoto Nagaoka 《Electrical Engineering in Japan》2014,186(3):19-30
The voltage variation in a remote system is large when the system is connected by long‐distance AC cables due to the cable capacitance. In Japan, the longest 54‐km 66‐kV AC submarine cable interconnection between the Kyushu mainland and Goto Islands was commissioned in 2005. It was requested to mitigate the voltage variation caused by switching off and on one circuit of the two circuits in the AC cables when a fault occurs. Since the conventional voltage control methods such as transformer tap changer or shunt capacitor and reactor banks are not sufficient because of their slow response time, a static var compensator (SVC) was installed on the Goto Islands. In such an application, an SVC control method should be developed so as not to override the existing voltage control systems. This paper describes the SVC control method developed for the Goto Islands AC interconnection project, which can be applied to similar situations. The effectiveness of the control method was verified by the results of effective value simulation and of field testing, which was implemented before the SVC was commissioned in 2007. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 186(3): 19–30, 2014; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.22337 相似文献
43.
44.
Jun Koyanagi Hideo Nagayama Satoru Yoneyama Takahira Aoki 《Mechanics of Time-Dependent Materials》2016,20(2):219-232
This paper presents the time dependence of the mesoscopic strain of a triaxial woven carbon-fiber-reinforced polymer under creep loading measured using digital image correlation (DIC). Two types of DIC techniques were employed for the measurement: conventional subset DIC and mesh DIC. Static tensile and creep tests were carried out, and the time dependence of the mesoscopic strain distribution was investigated by applying these techniques. The ultimate failure of this material is dominated by inter-bundle decohesion caused by relative rigid rotation and relating shear stress. Therefore, these were focused on in the present study. During the creep tests, the fiber directional strain, shear strain, and rotation were monitored using the DIC, and the mechanism for the increase in the specimen’s macro-strain over time was investigated based on the results obtained by the DIC measurement. 相似文献
45.
46.
Yoshitomo Isomae Takahiro Ishinabe Yosei Shibata Hideo Fujikake 《Journal of the Society for Information Display》2019,27(4):251-258
We achieved uniform liquid crystal (LC) alignment in lattice‐shaped dielectric walls 1 μm in pitch; this is a prerequisite when driving the individual pixels of spatial light modulators, facilitating the development of practical electronic holographic displays with a wide field of view. In lattice‐shaped dielectric walls, LC alignment becomes unstable, particularly on the bottom and the walls; the LC directors tend to align parallel to the walls. To overcome this problem, we created lattice‐shaped walls featuring partition plates that allow uniform LC alignment. When the plates confine LCs to small regions exhibiting spatial anisotropy, the LC elastic effect and wall anchoring forces align the LC directors parallel to the long anisotropic axis. We found that pixels 0.5 μm × 1.0 μm in pitch formed if the partition plates were sufficiently thick to allow shielding of electric field leakage. 相似文献
47.
48.
49.
Hiroyuki Kuramae Yuki Ikeya Hideo Morimoto 《International Journal of Mechanical Sciences》2010,52(2):183-197
A multi-scale parallel finite element (FE) procedure based on the crystallographic homogenization method was applied to the LDH sheet formability test analysis. For the multi-scale structure, two scales are considered. One is a microscopic polycrystal structure and the other is a macroscopic elastic plastic continuum. The analysis code can predict the formability of sheet metal in macro-scale, simultaneously the crystal texture and hardening evolutions in the micro-scale (Nakamachi E et al. Int J Plasticity 2007;23:450-8). Since huge computation time is required for the nonlinear dynamic multi-scale FE analysis, parallel computing technique based on domain partitioning of FE model for macro-continuum is introduced into the multi-scale code using the message passing interface (MPI) library and PC cluster (Kuramae H et al. In: Proceedings of the eighth international conference on computational plasticity, Part 1, 2005. p. 622-5). The explicit time stepping solution scheme in the nonlinear multi-scale FE dynamic problem is well-suited for parallel computing on distributed memory environment such as PC cluster because solving simultaneous equation is not required. We measured crystal morphologies of four automotive sheet metals, aluminum alloy sheet metals A6022-T43 and A5182-O, an asymmetrically rolled aluminum alloy sheet metal A6022-ASR, and mild steel HC220YD, by using the scanning electron microscope (SEM) with electron back scattered diffraction (EBSD) analyses, and defined a three-dimensional representative volume element (RVE) of micro polycrystal structure, which satisfy the periodicity condition of crystal orientation distribution. We evaluate not only macroscopic formability of the automotive sheet metals by the multi-scale LDH test analysis, but also microcrystalline texture evolution during plastic deformation. Furthermore, a relationship between the macroscopic formability and the microcrystal texture evolution was discussed through looking at multi-scale FE results. It is concluded that the mild steel HC220YD was the highest formability than the aluminum alloy sheet metals because of remaining and generating the γ-fiber texture, such as {1 1 1}〈1 1 0〉-{1 1 1}〈1 1 2〉 orientations, during plastic deformation. 相似文献
50.
Ultrastructure of the digestive tract in neotropical carnivorous catfish Hemisorubim platyrhynchos (Valenciennes, 1840) (Siluriformes,Pimelodidae)
下载免费PDF全文
![点击此处可从《Scanning》网站下载免费的PDF全文](/ch/ext_images/free.gif)