|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate显示文摘In eddy current testing, the law of attenuation of eddy current(EC) is of great concern. In conductive half space under the excitation of uniform magnetic field, the EC density decreases exponentially in the depth direction. However, in conductor with finite thickness tested by coil, the distribution of EC in the depth direction is more complicated. This paper studies the characteristics of EC attenuation in metallic plate of finite thickness. Simulation results show that there is an EC reflection at the bottom of plate, which changes the law of EC attenuation. A new concept, namely the equivalent attenuation coefficient, is proposed to quantify the speed of EC attenuation. The characteristics of EC attenuation are utilized to explain the nonmonotonic relation between coil voltage and plate thickness. Procedure of selecting frequency is discussed. Thereafter, measurement of plate thickness is carried out and accurate result is obtained. | Zhiwei Zeng Pengcheng Ding Jiayi Li Shaoni Jiao Junming Lin Yonghong Dai | 2019 | Chinese Journal of Mechanical Engineering2019，32，6： | 2 |
| 2 | Preparation of erbium ion-doped TiO2 films and the study of their photocatalytic activity under simulated solar light显示文摘A series of erbium ion-doped TiO_2(Er^(3+)-TiO_2) films were prepared by a sol-gel dip/spin coating method, and the effect of the dosage of erbium ion(0–2.0 mol%), the films coating layers(1–5 layers), and calcination temperature(400–700 °C) on the film structure and photocatalytic activity were investigated in detail. The films were characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), thermal analysis(TG-DTG) and UV–Vis diffusive reflectance spectra(DRS). The results showed that the films were composed of anatase, and no other TiO_2 phases(rutile and brookite). With the increase of the erbium ion dosage, the crystal size decreased. Erbium ion doping could enhance the thermal stability of TiO_2 and inhibit the increase of the crystallite size. Meanwhile doping of erbium ions gave rise to three typical absorption peaks within the range of visible light(400–700 nm), locating at 490, 523, and 654 nm, attributed to the transition of 4 f electrons. The higher calcination temperature led to higher crystallinity and bigger crystal grains. The photocatalytic performance of the films was evaluated by degradation of methyl orange solution under simulated solar light. The highest quality film we prepared was with 4 layers, 1.0 mol% dosage of erbium ion, and the calcination temperature of 500 °C. With this film,the degradation percentage of 7.8 mg/L methyl orange solution was up to 53.3% under simulated solar light after 6 h photoreaction. | Hongfei Lin Yujiao Huang Shaoni Li Chunhui Luan Wei Huang Xiaodong Wang Xianshe Feng | 2017 | Journal of Semiconductors2017，38，11： | 1 |
| 3 | Geochemical characteristics of upper Sinian Dengying dolomite at northern Yangtze platform: implication for Pb-Zn metallogenesis显示文摘1 Introduction and geological setting Several Pb-Zn ore deposits(i.e.,Mayuan Pb-Zn deposit)occurring inthe upper Sinian Dengying dolomitesin northern Yangtze platform have been discovered in recent years,interesting research | CHEN Baoyun LI Rongxi YU Jinjie LIU Shuaijie ZHANG Shaoni | 2017 | Acta Geologica Sinica(English Edition)2017，91，S1： | 0 |
| 4 | Genesis and mineralization of gold-bearing quartz veins in the Xiao Qinling area,central China显示文摘Gold-bearing quartz veins of the Taihua Group consisting of Archean metavolcanic rocks are a main gold deposit type in the Xiao Qinling area,one of the three biggest gold production areas in China.The quartz veins experienced strong alteration characterized by a typical mesothermal hydrothermal altered mineral assemblage.The grade of gold is affected by the contents of sulphides,e.g.galena,pyrite and chalcopyrite.Results of minor elements analysis for the of gold-bearing quartz veins indicate higher contents of Au and high contents of Ag,Pb,Cu,Cd,W,and Mo.Abundant fluid inclusions were found in the gold-bearing quartz veins.Three types of fluid inclusions were identified:(1) aqueous inclusions;(2) CO 2-bearing inclusions;and(3) daughter crystal-bearing fluid inclusions.Homogenization temperatures ranged from 110 to 670℃ with low and high peaks appearing at 160 180℃ and 280 300℃,respectively.The salinity of aqueous inclusions varies between 1.8 wt% and 38.2 wt% NaCl.The homogenization temperature and salinity show a positive correlation.The H and O isotopes of fluid inclusions in the gold-bearing quartz veins indicate that magmatic solution and metamorphic hydrothermal solution,together with meteoric water,were involved in the formation of gold-bearing fluid.Mesozoic magma activities related to granite intrusions should be the main source of CO 2 fluid with higher temperature and salinity. | LIANG Jiwei LI Rongxi ZHANG Shaoni CHEN Baoyun DUAN Lizhi Pierre Thibault | 2012 | Chinese Journal Of Geochemistry2012，31，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员