全文获取类型
收费全文 | 66篇 |
免费 | 8篇 |
专业分类
电工技术 | 7篇 |
综合类 | 1篇 |
化学工业 | 20篇 |
金属工艺 | 4篇 |
机械仪表 | 4篇 |
能源动力 | 1篇 |
轻工业 | 29篇 |
无线电 | 1篇 |
一般工业技术 | 3篇 |
冶金工业 | 1篇 |
原子能技术 | 1篇 |
自动化技术 | 2篇 |
出版年
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 3篇 |
2013年 | 5篇 |
2012年 | 1篇 |
2011年 | 1篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2006年 | 5篇 |
2005年 | 1篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2000年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1970年 | 1篇 |
1966年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有74条查询结果,搜索用时 31 毫秒
1.
Piezoelectric Properties of Pb(Mg1/3 Nb2/3 )O3 PbTiO3 -PbZrO3 Ceramics Modified with Certain Additives
HIROMU OUCHI MASAMITSU NISHIDA SHIGERU HAYAKAWA 《Journal of the American Ceramic Society》1966,49(11):577-582
Effects of additives on the piezoelectric properties of Pb(Mg1/3 Nb2/3 )O3 -PbTiO3 -PbZrO3 ceramics in a perovskite-type structure are described. The tetragonality of Pb(Mg1/3 Nb2/3 )0.375 -Ti0.375 Zr0.25 O3 ceramics increased with the addition of NiO, Cr2 O3 , or Fe2 O3 but decreased with the addition of MnO2 or CoO. The dielectric and piezoelectric properties of the base composition were improved markedly through selection of additives in proper amounts. Addition of NiO yielded a high dielectric constant and planar coupling coefficient for compositions at the morphotropic transition boundary. High mechanical Q -factors and low electrical dissipation factors were obtained by addition of MnO2 . Addition of both NiO and MnO2 produced a mechanical Q -factor of 2051 and a planar coupling coefficient of 0.553. The resonant frequency of Pb(Mg1/2 Nb2/3 )0.4375 Ti0.4375 zr0.125 O3 containing MnO2 had very low temperature and time dependence. The microstructure indicated that ceramics with a high mechanical Q -factor had a fine, uniform grain structure. Addition of Cr2 O3 retarded grain growth and addition of MnO2 , NiO, CoO, or Fe2 O3 promoted grain growth in the ternary system. 相似文献
2.
Economic Evaluation of Power System Flexibility by Commercial Air Conditioner Control with Large Penetration of Photovoltaic Generation
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)
High penetration of intermittent renewable energy such as photovoltaic (PV) and wind power could cause shortage of power system flexibility. Demand response is expected to help supply ancillary service instead of the conventional power plant. Commercial air conditioners are a promising responsive load for demand response because they account for a large proportion of power consumption in the power system. We calculate a system operation cost and hourly operation pattern of each power plant by using the optimal power generation model considering flexibility supply from controlling commercial air conditioner. We obtained the following results as an effect of commercial air conditioner control. (1) The power generation of oil fired power plants decreases at peak time and annual fuel cost of oil fired plant is reduced by approximately 30% at most in Kanto area. (2) The percentage of rated operation mode of LNG combined cycle plants increases. (3) Curtailed energy rate of PV decreases because a power storage amount by pumped hydropower generation increases. (4) Required battery capacity to reduce PV curtailed amount decreased by combining battery energy storage system in case of high penetration of PV. 相似文献
3.
YOSHIKI SUZUKI MINORU MIZUTANI TAKAMITSU SUGIURA NAOKI SAKAI TAKASHI OHIRA 《Electrical Engineering in Japan》2016,195(1):63-71
Electric vehicles (EVs) are expected to play a leading role in the changeover from fossil fuels to clean energy. However, EVs are currently not very popular, owing to their short cruising distance and long charging time. Wireless power transfer from the infrastructure to running EVs is expected to be the solution to these problems. Electric vehicle and electrified roadway (EVER) has been proposed as a wireless power transfer system for EVs while in motion. Via‐wheel power transfer (V‐WPT) is expected to be a wireless power transfer scheme for EVER. We designed and prototyped a 1:32 scale model of a V‐WPT system that consists of an RF inverter, an electrified roadway, a rectifier, and an EV with a dc motor. The output power of the prototype RF inverter was 5.9 W and the dc–RF conversion efficiency was 36.6%. The LC matching circuits for the V‐WPT were designed with two‐port conjugate matching because S11 of the V‐WPT was intrinsically –0.06 dB. After matching, the S11 value was reduced to –21.5 dB. The power transmission efficiency of the V‐WPT system was 75%. The RF–dc conversion efficiency of the rectifier was 62%. The total efficiency of the EVER system was 24.2%. 相似文献
4.
We discuss checking policies, in which an inspector is requested to perform the check, for a ono-unit system. Applying the unique modifications of Markov renewal processes, we analyse the stochastic behaviour of each CR policy (checking request policy) and CRSL policy (checking request and surveillance limit policy), where it is assumed that the failure time for each unit and the inspector's arrival time havo arbitrary distributions. Introducing replacement eosts, the request for the inspector to perform the check, system failure and surveillance, we derive the optimal policies which maximize the cost effectiveness under suitablo conditions for each model. In particular, wo discuss the optimal policies as a non-linear programming problem with two variables. 相似文献
5.
6.
Consideration of Stretchable Dry Electrodes for Smart Shirts Aimed for Biological Signal Monitoring
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)
YUSAKU AMANO YASUNORI TADA TOMONOBU SATO SHIGERU SAITO MASAHIRO INOUE 《Electrical Engineering in Japan》2018,203(4):63-71
Dry electrodes of a smart shirt for measuring biological signals were prepared by the additive printing method using a stretchable conductive paste with Ag fillers loading. Interfacial impedance between the electrode and skin depended on the contact pressure of electrode and the moisture of stratum corneum. When moisture of stratum corneum was more than 30%, ECG could be measured using the stretchable electrodes printed on a compression shirt. However, noise signal in the ECG signal increased when the moisture of stratum corneum was less than 30%. To solve this problem, we propose to use additional electrodes made of an electrically conductive kneaded rubber. 相似文献
7.
Gelation Mechanism of Soybean 11S Globulin: Formation of Soluble Aggregates as Transient Intermediates 总被引:2,自引:0,他引:2
Thermal association-dissociation behavior of soybean 11S globulin was investigated by sucrose density gradient centrifugation and polyacrylamide gel electrophoresis. Soluble aggregates with a molecular weight of 8 × 106 were formed when 0.5% and 5% protein solutions were heated for 1 min at 100°C. At the lower protein concentration, subsequent heating caused disappearance of the soluble aggregate followed by complete dissociation into acidic and basic subunits. At the higher concentration, however, subsequent heating caused formation of highly polymerized aggregates, and gel was formed after 5 min of heating. The soluble aggregates appear to be transient intermediates in the course of gel formation of 11S globulin. 相似文献
8.
9.
10.
H. OKAMURA S. SAKAI I. SUSUKI 《Fatigue & Fracture of Engineering Materials & Structures》1979,1(4):409-419
Abstract This paper presents a simple algorithm of hysteresis loop counting to make on-line data processing much easier. It involves a modification of the range pair counting method and the rain flow method and yields practically the same result as these methods. In addition, the applicability of the present method to cumulative damage estimation is examined in experiments on fatigue crack growth rates under stationary random loads and low cycle fatigue lives under stationary random loads together with non-stationary random loads such as seismically excited loads. 相似文献