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Effect of electric field intensity on the Morphology of Magnetic-field-assisted Electrospinning PVP Nanofibers

Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1107-1111页

作者： MEI Linyu HAN Rui GAO Yanfang FU Yizheng LIU Yaqing Research Center for Engineering Technology of Polymeric Composites of Shanxi Province North University of China School of Mechanical and Power Engineering North University of China College of Materials and Science Engineering North University of China

Polyvinylpyrrolidone （PVP） nanofibers were processed by magnetic-field-assisted electrospinning （MFAES） technique. Since electric field intensity was one of the most important parameters influencing fiber morphology, the research aimed to study how electric field intensity affects fiber morphology in MFAES technique. The experimental results revealed that the distribution of diameter widened while the average diameter of PVP fibers decreased and the degree of the alignment reduced with the increase of electric field intensity. However, the fibers would be conglutinated together when the electric field intensity was too low. Also, the increase of working distance made the average diameter and the degree of the alignment increase slightly under the same electric field intensity, but the fibers could be partially curved instead of being fully straight if the working distance was too long. It was also indicated that maintaining the electric field intensity at 1 kV/cm With the voltage-distance combinations of 12 kV-12 cm （for 12wt% PVP） and 15 kV-15 cm （for 14wt% PVP） among all other combinations would result in the optimal alignment as well as a narrow size distribution of the fibers.

关键词： magnetic-field-assisted electrospinning PVP ordered fibers electric field intensity

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Research on Simulation Methods of electric field intensity on Surface of 10 kV Cable Joint

Research on Simulation Methods of Electric Field Intensity o...

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作者： Ruxin Zhang Jun Xiong Zheng Wu Lei Liao Mingyan Wu Gang Du Xueyou Huang Wenpei Jin Haiming Li Jian Zhang Wenli Cheng Binxian Lu Guagnzhou Power Supply CSG Department of electrical and Electronic Engineering North China Electric Power University

The electric field intensity（EFI） is important characteristic quantity for evaluating the internal insulation state of cable joints. Based on finite element method, this paper proposes two EFI research methods, field-circuit coupling method and equivalent circuit method. The average EFI of the inner surface of the outer semi-conducting shield can be calculated from the current in the measuring circuit. The relative error between these two methods is about 15%, which roughly proves the consistency of the two methods. Further practical application research enables online monitoring of cable joints.

关键词： Cable Joints electric field intensity Equivalent Circuit Method field-Circuit Coupling Method Finite Element Simulation Software

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electric field Distribution of Soluble Salt Deposition on the Surface of Insulators in Railway Overhead Lines

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Chinese Journal of electrical Engineering 2022年第3期8卷 123-132页

作者： Sihua Wang Junjun Wang Long Chen Lei Zhao School of Automation&electrical Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Rail Transit electrical Automation Engineering Laboratory of Gansu Province Lanzhou Jiaotong UniversityLanzhou 730070China

Different constituents of soluble salts have different effects on the insulation performance of insulators.To study the electric field distribution of soluble salt deposition on the surface of high-speed railway insulators,a two-dimensional model of the cantilever insulator electrostatic field and constant-current field with soluble salt deposition is constructed.The simulation results indicate that the relative dielectric constant of dry pollution is the main factor that affects the electric field distribution on the surface of the insulator.The electric field intensity is arranged in the following order:CaSO_(4)>KNO_(3)>NaNO_(3)>K_(2)SO_(4)>NaCl>MgSO_(4),and the conductivity of each dirty liquid in the wet state becomes a key factor affecting the electric field distribution,which is specifically shown as sodium chloride>nitrate>sulfate.The simulation results are compared with existing test results to verify that they were correct.It is also found that the electric field intensity of the insulator with good hydrophobicity is slightly greater than that of the insulator without hydrophobicity.The results provide a theoretical basis for the classification of regional pollution levels and the testing of insulator contamination in the laboratory.

关键词： Catenary insulator soluble salt composition electric field intensity electrostatic field constant-current field

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Numerical Study of Temperature and electric field Effects on the Total Optical Absorption Coefficient in the Presence of Optical Inter-Conduction-Subband Transitions in InGaN/GaN Single Parabolic Quantum Wells

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1253-1261页

作者： Redouane En-nadir Haddou El-ghazi Anouar Jorio Izeddine Zorkani Hassan Abboudi Fath Allah Jabouti LPS Sidi Mohamed Ben Abdullah UniversityFez30000Morocco ENSAM Hassan-II UniversityCasablanca20470Morocco

In this paper,we theoretically investigate the total optical coefficient(TOAC)considering 1S-2P and 2S-2P conduction subband transitions in a single parabolic quantum well(SPQW)with an on-center hydrogen-like impurity.Within the framework of the effective-mass approximation,the Schrödinger equation is solved numerically to obtain the eigenvalues and their corresponding eigenvectors using the finite difference method.The calculations are performed for finite confinement potential height,taking into account the dielectric and effective mass mismatches between GaN and InGaN materials under the considered electric field and temperature effects.The temperature dependence of the effective mass,dielectric constant and band gap energy are obtained accordingly.On the one hand,the results show that a significant shift is produced with the variation of both the temperature and the intensity of the electric field.On the other hand,the absorption spectrum is shifted to lower energies with increasing both electric field strength and temperature.Moreover,its amplitude is enhanced with an increase in the intensity of the electric field,and show a slight drop with increasing temperature for the two optical transitions considered.The results show that such parameters can be used to adjust the optical properties of single parabolic Quantum Well for solar cell applications.

关键词： TOAC optical transitions SPQW electric field intensity temperature hydrogenic-impurity

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Research on electric Mesh Grid for Seawater Desalination Based on Capacitive deionization

Research on Electric Mesh Grid for Seawater Desalination Bas...

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11th International Conference on electrical Machines and Systems

作者： CHENG Shukang GONG Hailong GUO Bin ZHANG Peng Harbin Institute of Technology,Harbin 150080,China Harbin Institute of Technology Harbin 150080 China

ISBN: (纸本)9787506292214

＜正＞To study seawater desalination method which has low energy consumption and environmental friendly effect,the concept of electric mesh grid for seawater desalination based on capacitive deionization is proposed.The electric mesh grid adopts mesh structure and realizes the desalination function by the electric field which is produced by network of high-density with the charge of the contrary sign.The process principle of electric mesh grid is introduced in this paper.The gain condition of the surface area of electric mesh grid is discussed, the field distribution in electric mesh grid is calculated by FEA and the ion adsorption with different mesh structure is researched.The analysis results show that the electric mesh grid of same-mesh with contrary-sign has a significant advantage for increasing ion adsorption.

关键词： seawater desalination electric mesh grid electric field intensity ion adsorption

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Analysis of Electromagnetic Environment Optimization Measures for UHV Transmission Lines

Analysis of Electromagnetic Environment Optimization Measure...

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第37届中国控制会议

作者： Liqun Shang Weiwei Zhu College of electrical and Control Engineering Xi’an University of Science and Technology

To reduce the electric field intensity under UHV transmission lines based on erecting shielded wires,this paper studies shielding effect of shield wire from four aspects,respectively,the number,erection height,radius and arrangement,so as to seek the optimal position of the shield wire.In addition,simulation results verify that reasonable setting of shielded wire parameters can control the electric field below the transmission line within the limiting value.

关键词： electric field intensity transmission lines shielded wires shielding effect

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