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RETRACTED: Preparation of high-performance polymer piezoelectric thin film by electric field induction technology

Polymer 2020年 196卷

作者： Tingting Cai Ting Bi Yun Yang Ernest Bi Shuping Xue Department of Chemistry and Chemical Engineering Luliang University Lvliang 033000 PR China Material Forming and Control Engineering Taiyuan University of Science and Technology Jincheng 048011 PR China Department of Mining Engineering Luliang University Lvliang 033000 PR China School of Chemical Engineering Changchun University of Technology Changchun 130012 PR China

This article has been retracted: please see Elsevier Policy on Article Withdrawal ( https://***/about/our-business/policies/article-withdrawal ). This article has been retracted at the request of the authors. The authors have found that the test methods used in the article are not rigorous. They simply considered the force produced by different weights. In fact, because the bottom area of the weight is different, the pressure on the film is not equal to the force. All of the co-authors have agreed to retract this paper and apologise to readers of the journal.

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BaTiO3 assisted PAN fiber preparation of high performance flexible nanogenerator

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Nanotechnology 2020年第24期31卷 24LT01页

作者： Tingting Cai Yun Yang Ting Bi Ernest Bi Yanfang Li Department of Chemistry and Chemical Engineering Luliang University Lvliang 033000 People's Republic of China. Department of Mining Engineering Key Laboratory of Maintenance and Inspection of Coal Mine Mechanical Equipment Luliang University Lvliang 033000 People's Republic of China. Material Forming and Control Engineering Taiyuan University of Science and Technology Jincheng 048011 People's Republic of China. School of Chemical Engineering Advanced Institute of Materials Science Changchun University of Technology Changchun 130012 People's Republic of China.

Recently, polyacrylonitrile (PAN) fiber films have shown greater advantages over polyvinylidene fluoride (PVDF) in the field of energy harvesting. Adding other substances with high piezoelectric coefficient is worth exploring to further improve the output voltage of PAN. Here, we successfully dispersed high dielectric constant barium titanate in PAN nanofiber films with different dosages using an electrospinning technology. The X-ray diffraction and Fourier transform infrared spectroscopy results indicated that BaTiO nanoparticles aid in transforming PAN from a 3-helical conformation to a planar zigzag conformation, thus improving the output voltage of PAN nanofibers significantly and also promoting its mechanical properties. In addition, the human body function monitoring experiment showed a good response current to the rhythm of elbow bending, knee bending, running, and breathing. Besides, when a simple rectifier circuit was applied, the capacitor could be charged to 2 V in less than 2 min and light a commercial LED through repeated tapping.

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Review of the image assessment evaluation algorithm based on local information and structure 17

Review of the image assessment evaluation algorithm based on...

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2017 International Conference on Data Mining, Communications and Information Technology, DMCIT 2017

作者： Xiao, Wenyu Feng, Shide Zhang, Chuankai Faculty of Information Technology Macau University of Science and Technology C-Macau China Material Forming and Control Engineering Dept. Harbin University of Science and Technology Harbin250021 China Dept. of Computer Science and Technology Wuhan University Wuhan430072 China

ISBN: (纸本)9781450352185

Image quality assessment (IQA) of an image is a vital research direction in the field of image processing. With the quickly developing evaluation methods, study of image quality evaluation method has a profound impact on image and video processing. At present, most of the image quality assessment methods are based on full reference. The traditional quality evaluation method based on structural similarity has the characteristics of narrow application range, unstable evaluation algorithm and so on. The difficulties of obtaining the original image and the difficulty of the reference model design directly incented the development of the semi reference IQA. In this context, a topic-based image quality evaluation process grounded on local information and structure information is proposed. Compared to the traditional image quality evaluation algorithm, the structure similarity has been improved by combining local information. The results show that the evaluation results of the method are more reasonable and stable, which provides a good reference for the post processing of the image. © 2017 Association for Computing Machinery.

关键词： Quality control

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Effect of CO2 on the permeation of hydrogen in carbon steel in H2S environment

Effect of CO2 on the permeation of hydrogen in carbon steel ...

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Chinese materials Conference on materials and Technologies for Energy Supply and Environmental engineering, 2015

作者： Bai, Pengpeng Liang, Yuxuan Liu, Liwei Zhou, Chengshuang Zheng, Shuqi Chen, Changfeng State Key Laboratory of Heavy Oil Processing and Department of Materials Science and Engineering China University of Petroleum Beijing102249 China Shougang Research Institute of Technology Beijing100041 China Institute of Material Forming and Control Engineering Zhejiang University of Technology Hangzhou310014 China

ISBN: (纸本)9783038356561

The effect of CO2 on the hydrogen permeation behaviour of carbon steel was investigated in a high temperature and high pressure hydrogen permeation device, through hydrogen permeation test, weight loss test, hydrogen content test, and SEM-EDS. The results showed that the peak value of the hydrogen permeation curves were almost the same with or without CO2, but the hydrogen permeation curve rose sharply, and then decreased gradually to a stabilized current value in H2S/CO2 environment, which was lower than in H2S environment. The corrosion rates and the amount of hydrogen of steel in H2S/CO2 environment were lower than in H2S environment. Therefore, it is considered that CO2 has an effect on the hydrogen permeation in H2S, mainly due to the change of corrosion products. © 2016 Trans Tech Publications, Switzerland.

关键词： Carbon dioxide

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Motion Stability Analysis of Non-sinusoidal Oscillation of Mold Driven by Servomotor

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Chinese Journal of Mechanical engineering 2015年第6期28卷 1269-1276页

作者： YAO Yunfeng LI Junxia FANG Yiming School of Materials Science and Engineering Hebei University of Science and Technology Key Laboratory of Material Near-net Forming Technology of Hebei Province Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

The investments of the electro-hydraulic servo system of the mold non-sinusoidal oscillator are great, the modification ratio of the mechanical type is unable to be adjusted online, and some continuous casters suffer from server resonance during the casting. A mold non-sinusoidal oscillation mechanism driven by servomotor is proposed and the prototype is produced in the lab, the investment is low and the modification ratio is can be adjusted online, and the stability problem is studied. At first the dynamics model of the servomotor non-sinusoidal oscillation is established, and the kinematics differential function is deduced. Furthermore, based on the harmonic balance method, the eigenvalues of the system are solved; the criterion of the stability of the system is put forward. In addition, the eigenvalues and harmonic with different oscillating parameters are analyzed. Analytical results show that the real parts of the eigenvalues are positive, the system will be unstable, and the resonance will occur when the positive real parts of the eigenvalues are extremum. A foundation is established for solving the running smooth problem and next application of this mechanism.

关键词： continuous casting mold non-sinusoidal oscillation servomotor stability resonance

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Experimental research on tribological performance of water-based rolling liquid containing nano-TiO2

Experimental research on tribological performance of water-b...

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作者： Zhu, Zuoxin Sun, Jianlin Niu, Tailong Liu, Nana Department of Material Forming and Control Engineering School of Materials and Engineering University of Science and Technology Beijing 30 Xueyuan Road Haidian District Beijing100083 China

Nano-TiO2 was dispersed in water to study the influences of nanoparticles on the tribological properties of water-based rolling liquid for hot steel. The phase composition and microstructure of nano-TiO2 were investigated by X-ray diffraction and transmission electron microscopy methods. The friction reduction and antiwear properties were measured on a four-ball friction tester, and then hot rolling experiments with lubrication have been carried out. The rolling force and surface roughness were measured. Moreover, the surface elements of the steel lubricated by nano-TiO2 rolling liquid were analyzed by energy dispersive spectroscopy. The results showed that nano-TiO2 as water-based liquid additives can effectively improve the antiwear properties of steel-steel friction pair and reduce the friction coefficient. At the same time, nano-TiO2 shows good lubrication properties during hot rolling. It is inferred from the lubrication and repairing mechanism that TiO2 nanoparticles sediment on the surface of steel, and the lower surface film is formed under high temperature and high pressure. The film possesses excellent antiwear, friction-reducing and repair properties. © IMechE 2014.

关键词： Nanoparticles

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Microstructure and performance of AZ80D magnesium alloy by purification of chloride flux containing Er

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Rare Metals 2014年第5期33卷 541-546页

作者： Zhong-Jun Wang Guan-Qiao Su Wei-Ping Jia Qing-Xiang Yang School of Material and Metallurgy University of Science and Technology Liaoning Key Laboratory of Materials Forming and Microstructure and Properties Control Education Department in Liaoning Province State Key Laboratory of Metastable Materials Science and Technology College of Materials Science and EngineeringYanshan University

The purification effects of Er addition in chloride flux during smelting on microstructure, tensile properties, and corrosion resistance of as-cast AZ80 D magnesium alloy were carried out. The results show that Er addition in the flux can eliminate the MgO inclusions and improve the tensile properties and corrosion resistance of the alloy. Using chloride flux mixed with 8.0 wt% Er, σb and δ of the as-cast AZ80 D magnesium alloy can be improved from 150 MPa and 2.1 % to the maximum value of 230 MPa and 4.8 %, respectively. Meanwhile, the corrosion rate decreases from 1.10 to 0.12 mg·（cm^2·d）^-1 in 5 wt% NaCl solution. However, with increasing Er content in chloride flux further, φ-（Al7ErMn5） and τ-（Al66.7Mg23.3Er10） phase are formed, and the morphology of γ-（Mg17Al12） phase is modified. The coarse φ-（Al7ErMn5）phase along dendrite boundaries decreases cohesion force between dendrites, which results in the worse of tensile properties.

关键词： Er Chloride flux AZ80D Microstructure Magnesium alloy

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Dependence of the abnormal protective property on the corrosion product film formed on H2S-adjacent API-X52 pipeline steel

Dependence of the abnormal protective property on the corros...

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作者： Zheng, Shuqi Zhou, Chengshuang Chen, Xingyang Zhang, Lin Zheng, Jinyang Zhao, Yongzhi State Key Laboratory of Heavy Oil Processing Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China Institute of Material Forming and Control Engineering College of Materials Science and Engineering Zhejiang University of Technology Hangzhou 310014 China Institute of Process Equipment Zhejiang University Hangzhou 310027 China

The dependence of the protective property on the corrosion product film formed on API-X52 pipeline steel was investigated using the electro-chemical hydrogen permeation method in acidic solution under various H2S partial pressures. The hydrogen permeation current is dependent on the H 2S concentration and the corrosion product film. The hydrogen permeation current increases with the H2S partial pressure, and decreases with thickening the corrosion product film. The dense corrosion product films formed in 1.0 MPa H2S shows the obvious protective property against hydrogen permeation, while the delamination of the corrosion product film formed in 0.1 MPa H2S weakens the protective property. The hydrogen permeation current in 1.0 MPa H2S is lower than that in 0.1 MPa H2S after 200 h immersion in acidic solution and this is of great significance to the service life prediction and the prevention of hydrogen embrittlement in H2S-adjacent pipelines. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Steel pipe

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Hydrogen Effects on Nanoindentation Creep of Austenitic Stainless Steels

Hydrogen Effects on Nanoindentation Creep of Austenitic Stai...

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第十五届全国氢能会议暨第7届两岸三地氢能研讨会

作者： Lin ZHANG Chengshuang ZHOU Jinyang ZHENG Yongzhi ZHAO Chaohua GU Chilou ZHOU Zhengli HUA Xingyang CHEN Institute of Process Equipment Zhejiang UniversityHangzhou 310027China Institute of Material Forming and Control Engineering Zhejiang University of TechnologyHangzhou 310014

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LJ707-crnimo flux cored wire of basic slag system be applied to non-preheating welding technology of HSLA

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2nd International Conference on Mechanical Automation and materials engineering, ICMAME 2013

作者： Hurile, Tao Gao Chen, Fu Rong Hao, Yong Fei Zhang, Ai Ai College of Materials Science and Engineering Material Forming and Control Engineering Laboratory Inner Mongolia University of Technology Hohhot 010051 China

ISBN: (纸本)9783037857830

This article investigates the welded joints of HSLA Q550 without preheating and post-heating treatment process. Tensile test, bending test, low temperature impact test, and the impact fractures and joint microstructure observation and analysis are *** test result shows that the welded joins achieves equal strength with base metal. The average values of the welded joints impact absorbed energy at -20 °C are greater than 40J and at -40 °C its average values are greater than 27J, thus the low-temperature impact energy joint can meet the service requirements of hydraulic support. It shows that choosing proper welding material, developing reasonable welding and post-heating treatment process can cancel the preheating process of Q550 steel welding. © (2013) Trans Tech Publications, Switzerland.

关键词： Welding

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