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electrical properties of Medium Voltage Electricity Distribution Networks

CSEE Journal of Power and Energy Systems 2021年第3期7卷 497-509页

作者： Sathsara Abeysinghe Muditha Abeysekera Jianzhong Wu Mahesh Sooriyabandara School of Engineering Cardiff UniversityCardiff CF243AAUnited Kingdom Toshiba-Bristol Research and Innovation Laboratory Bristol BS14ND.United Kingdom

An increasing amount of low carbon technologies(LCT)such as solar photovoltaic,wind turbines and electric vehicles are being connected at medium and low voltage levels to electric power *** support high-level decision-making processes,the impacts of the LCTs on large numbers of different types(e.g.,rural,suburban,urban)of distribution networks need to be fully understood and ***,detailed modeling of large numbers of real-world networks is challenging for two ***,access to real-world network data is limited,and second,cleaning the data requires a significant amount of time,even before modeling of the *** paper offers a novel systematic methodology aimed at identifying and quantifying the key electrical properties of medium-voltage level distribution *** methodology allows for characterizing different types(e.g.,suburban,urban)of distribution networks and obtaining'depth'dependent electrical properties of the models of the *** key sets of(electrical)data were used for the *** first set was installed capacities of distribution substations;and the second set was the conductor cross sections of the distribution *** the graph models of real-world networks,'nodes'represent the distribution sub-stations,switchgears,busbars and consumers locations of the network.'Links/edges'stand for the connections between the nodes through distribution *** results of the investigation of the real-world networks showed that,the substation capacities and the conductor cross sections could characterize the electrical properties of suburban and urban type distribution *** resulted probability density functions(PDF)of the electrical properties of suburban and urban type distribution networks have the potential to be directly used in generating realistic distribution network models.

关键词： Electricity distribution networks electrical properties medium voltage synthetic networks statistically-similar networks

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electrical properties of m×n cylindrical network

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Chinese Physics B 2020年第8期29卷 182-197页

作者： Zhi-Zhong Tan Zhen Tan Department of Physics Nantong UniversityNantong 226019China School of Information Science and Technology Nantong UniversityNantong 226019China

We consider the problem of electrical properties of an m×n cylindrical network with two arbitrary boundaries,which contains multiple topological network models such as the regular cylindrical network,cobweb network,globe network,and so *** deduce three new and concise analytical formulae of potential and equivalent resistance for the complex network of cylinders by using the RT-V method(a recursion-transform method based on node potentials).To illustrate the multiplicity of the results we give a series of special ***,the results obtained from the resistance formulas of cobweb network and globe network obtained are different from the results of previous studies,which indicates that our research work creates new research ideas and *** a byproduct of the study,a new mathematical identity is discovered in the comparative study.

关键词： cylindrical network complex boundaries RT-V method electrical properties Laplace equation

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electrical properties OF CONDUCTIVE POLYMER COMPOSITES PREPARED BY AN INNOVATIONAL METHOD

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Chinese Journal of Polymer Science 2010年第6期28卷 869-876页

作者： Chang Lu Cui-yun Liu Zhi-zheng Li Tao Jiang Ji-chun Liu Shu-ge Peng Yu-qing Zhang Key Lab of Polymer Science and Nanotechnology Chemical Engineering&Pharmaceutics SchoolHenan University of Science and TechnologyLuoyang 471003China

An innovational method that poly(styrene-co-maleic anhydride)(SMA),a compatibilizer of immiscible nylon6/polystyrene(PA6/PS) blends,was first reacted with carbon black(CB) and then blended with PA6/PS,has been employed to prepare the PA6/PS/(SMA-CB) composites of which CB localized at the *** PA6/PS/CB blends,CB was found to preferentially localize in the PA6 ***,in the PA6/PS/(SMA-CB) blends,it was found that CB particles can be induced by SMA to localize at the *** electrical porperties of PA6/PS/(SMA-CB) composites were *** results showed that the composites exhibited distinct triple percolation behavior,*** percolation is governed by the percolation of CB in SMA phase,the continuity of SMA-CB at the interface and the continuity of PA6/PS *** percolation threshold of PA6/PS/(SMA-CB) was only 0.15 wt%,which is much lower than that of PA6/PS/***,the PTC(positive temperature coefficient) intensity of PA6/PS/(SMA-CB) composites was stronger than that of PA6/PS/CB and the negative temperature coefficient(NTC) effect was *** electrical properties of PA6/PS/(SMA-CB) were explained in terms of its special interface morphology:SMA and CB localize at interphase to form the conductive pathways.

关键词： Polymer composites Carbon black Morphology electrical properties

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electrical properties of Plasma Deposited Low-Dielectric-Constant Fluorinated Amorphous Carbon Films

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Plasma Science and Technology 2006年第6期8卷 724-726页

作者：吴振宇杨银堂汪家友 Key Lab of Ministry of Education for Band-Gap Semiconductor Materials and Devices Institute of MicroelectronicsXidian UniversityXi'an 710071China

Fluorinated amorphous carbon （a-C：F） films were deposited at room temperature using C4Fs and CH4 as precursor gases by electron cyclotron resonance chemical vapour deposition （ECR-CVD）. Chemical structures were analysed using X-ray photoelectron spectroscopy （XPS）. The current conduction shows ohmic behaviour and the leakage current increases with the content of C sp2 in the deposited a-C：F films at a low electric field. The behaviour of the leakage current is well e^plained by the Poole-Frankel mechanism at a high electric field. The interface traps, rather than chemical structures, of a-C：F films determine the PF emission current.

关键词： electrical properties conduction behaviour chemical vapour deposition a-C:F

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electrical properties of Na_(2)Pb_(2)R_(2)W_(2)Ti_(4)V_(4)O_(30)(R=Dy,Pr)ceramics

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Journal of Advanced Ceramics 2013年第2期2卷 112-118页

作者： Piyush R.DAS B.N.PARIDA R.PADHEE R.N.P.CHOUDHARY Department of Physics Institute of Technical Education&ResearchSiksha‘O’Anusandahan UniversityKhandagiriBhubaneswar 751030OdishaIndia

The polycrystalline samples of complex tungsten bronze(TB)Na_(2)Pb_(2)R_(2)W_(2)Ti_(4)V_(4)O_(30)(R=Dy,Pr)compounds were prepared by solid-state reaction ***-temperature preliminary structural studies confirm the formation of the compounds in the orthorhombic crystal *** studies of electrical properties of the materials using complex impedance spectroscopy technique exhibit that the impedance and related parameters are strongly dependent upon temperature and microstructure(bulk,grain boundary,etc).An observation of negative temperature coefficient of resistance(NTCR)suggests the materials have semiconducting *** variation of AC conductivity with temperature shows a typical Arrhenius behavior of the *** the samples obey Jonscher’s universal power *** existence of hopping mechanism in the electrical transport processes in the system with non-exponential type of conductivity relaxation is confirmed by electrical modulus analysis.

关键词： ceramics impedance spectroscopy electrical properties ferroelectricity microstructure

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electrical properties of BaFe_(0.9)Sn_(0.1)O_(3)–BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3)composite thick-film thermistors

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Rare Metals 2020年第11期39卷 1321-1327页

作者： Chang-Lai Yuan Ying Luo Qin Feng Yun Yang Xiu-Juan Zhou Xin-Yu Liu School of Material Science and Engineering Guilin University of Electronic TechnologyGuilin541004China Guilin Academy of Air Force Guilin541004China

The BaFe_(0.9)Sn_(0.1)O_(3)-BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3)composite thick films were prepared by screen printing.X-ray diffraction(XRD)analysis confirms that the composite films are still composed of BaFe_(0.9)Sn_(0.1)O_(3)-BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3)*** the prepared BaFe_(0.9)Sn_(0.1)O_(3)-BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3)composite thick films,a linear relationship between the logarithmic resistivity and the reciprocal of the absolute temperature is observed,indicating an excellent NTC thermistor *** values of resistivity at 25℃,thermistor constant and activation energy,decreasing with BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3)content increasing,are in the range of 8.9-92,990Ω·cm,1,126-3,777 K and 0.097-0.325 eV,*** analysis shows that at higher BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3)content,the electrical properties of the composite films are mainly attributed to the contribution of grains and grain *** the gradual decrease of BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3)content,the grain boundaries affect strongly the electrical properties of the composite films.

关键词： Thick films BaCo_(0.02)^(Ⅱ)Co_(0.04)^(Ⅲ)Bi_(0.94)O_(3) BaFe_(0.9)Sn_(0.1)O_(3) electrical properties

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Influence of Nitrogen Vacancy Concentration on Mechanical and electrical properties of Rocksalt Zirconium Nitride Films

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Acta Metallurgica Sinica(English Letters) 2017年第11期30卷 1100-1108页

作者： Ke-Chang Han Guo-Qiang Lin Chuang Dong Kai-Ping Tai Xin Jiang Key Laboratory for Material Modification by Laser Ion and Electron Beams(Ministry of Education)Dalian University of Technology Institute of Metal Research Chinese Academy of Sciences

To study the influence of the nitrogen vacancy （VN） on mechanical and electrical properties of zirconium nitride deeply, ZrNx films with different VN concentrations were synthesized on the Si （111） substrates by enhanced magnetic filtering arc ion plating. The morphologies, microstructures, residual stresses, compositions, chemical states, mechanical and electrical properties of the as-deposited films were characterized by field-emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectrometry, Nanoindenter and Hall effect measurements. The results showed that ZrNx films exhibited rocksalt single-phase structure within a VN concentration ranging from 26 to 5%. The preferred orientation, thickness, grain size and residual stress of the ZrNx films kept constant at different VN concentrations. Both the nanohardness and elastic modulus first increased and then decreased with the decrease in VN concentration, reaching the peaks around 16%. And the electric conductivity of the ZrNx films showed a similar tendency with nanohardness. The underlying atomic-scale mechanisms of VN concentration-dependent hardness and electric conductivity enhancements were discussed and attributed to the different electronic band structures, rather than conventional meso-scale factors, such as preferred orientation, grain size and residual stress.

关键词： ZrN_x films Nitrogen vacancy Hardness electrical properties Band structure

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Optical and electrical properties of electrochemically deposited polyaniline/CeO2 hybrid nanocomposite film

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Journal of Semiconductors 2011年第4期32卷 25-30页

作者： Anees A.Ansari M.A.M.Khan M.Naziruddin Khan Salman A.Alrokayan M.Alhoshan M.S.Alsalhi King Abdullah Institute for Nanotechnology King Saud UniversityRiyadh-11451P.O.Box-2454Saudi Arabia Department of Chemical Engineering King Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia

This paper reports the optical and electrical properties of electrochemically deposited polyaniline （PANI）/cerium oxide（CeO;） hybrid nano-composite film onto indium-tin-oxide（ITO） glass ***-visible spectroscopy andⅠ-Ⅴcharacteristic were performed to study the optical and electrical parameters of the electrochemically deposited *** film exhibited a strong absorption below 400 nm（3.10 eV） with a well defined absorbance peak at around 285 nm（4.35 eV）.The estimated band gap of the CeO;sample was 3.44 eV,higher than bulk CeO;powder（E;= 3.19 eV） due to the quantum confinement *** and electrochemical characteristics indicated that the electrical properties of PANI/CeO;hybrid nanocomposite film arc dominated by PANI doping.

关键词： cerium oxide polyaniline nanocomposite optical properties electrical properties

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Tailoring of structural,optical and electrical properties of anatase TiO_(2)via doping of cobalt and nitrogen ions

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Journal of Materials Science & Technology 2022年第16期111卷 287-297页

作者： Anchal Sharma Puneet Negi Ruhit Jyoti Konwar Hemaunt Kumar Yogita Verma Shailja Prakash Chandra Sati Bhargav Rajyaguru Himanshu Dadhich N.A.Shah P.S.Solanki Department of Physics Eternal UniversityBaru SahibHimachal Pradesh173101India Centre of Excellence in Energy Science and Technology Shoolini UniversitySolanHimachal Pradesh173229India Department of Applied Science and Humanities Rajkiya Engineering CollegeBijnorUttar Pradesh246725India Department of Physics Rajiv Gandhi Government Post Graduate CollegeMandsaurMadhya Pradesh458001India Department of Physics Saurashtra UniversityRajkot360005India

Pure(pristine)anatase and mono–doped and co–doped derivatives of TiO_(2)having nitrogen(N)and cobalt(Co)as dopants with respective fixed doping concentrations of 0.7 mol.%and 1.0 mol.%were synthesized using auto–combustion sol–gel *** doping effects at corresponding non–metal and transition metal sites of TiO_(2)on the basis of the structural,optical and electrical properties have been investigated.X–ray diffraction(XRD)measurement confirms the formation of pure anatase phase of TiO_(2)for all samples having I41/amd space group of tetragonal structure which has been also verified by the Raman spectroscopy *** crystallographic parameters have been calculated by performing Rietveld refinement of XRD data including average crystallite size that has been observed in the range of10–15 *** anatase phase indicates the incorporation of Co^(2+)into TiO_(2)lattice which assists the substitution of N in place of oxygen in co–doped TiO_(2).The band gap tuning towards the visible region from3.2 to 2.1 e V has been achieved with mono–doping and co–doping of the N and Co in TiO_(2)*** can be described in terms of the formation of localized levels of N–2p and Co–3d states in mono–doping and an isolated intermediate band formation in co–doping *** properties have been investigated in details and explained as the synergetic effects of structural and inherent ionic characters of various *** observed band gaps of all doped samples lie within the visible region which makes them pertinent as the solar energy harnessing materials for photocatalytic and photovoltaic applications.

关键词： TiO_(2) Sol–Gel X–ray diffraction electrical properties Optical properties

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Effects of cooling rate on the microstructure and electrical properties of Dy_2O_3-doped ZnO-based varistor ceramics

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Rare Metals 2007年第1期26卷 39-44页

作者： LIU Hongyu KONG Hui JIANG Dongmei SHI Wangzhou MA Xueming ZHANG Huining Department of Physics East China Normal University Shanghai 200062 China College of Science Wuhan University of Science and Technology Wuhan 430081 China Shanghai Research Institute of Petrochemical Technology Shanghai 201208 China

The microstructure, electrical properties, and density of Dy2O3-doped ZnO-based varistor ceramics, prepared using high-energy ball milling （HEBM） and sintered at 800℃, were investigated by increasing the cooling rate in the order of H （slow cooling in furnace） → L （cooling in furnace） → K （cooling in air）. With the increase in cooling rate, the grain size and density decreased, the breakdown voltage （VImA/mm） increased, and the nonlinear coefficient （α） and leakage current （IL） exhibited extremum. The sample with the cooling type L showed the best properties with the breakdown voltage of 2650 V/ram, o：of 20.3, IL of 5.2 laA, and density of 5.42 g/cm^3. The barrier height （ФB）, donor concentration （Nd）, density of the interface states （Nd）, and barrier width （ω） all exhibited extremum during the alteration in cooling rate. The different relative amount of Bi-rich phase and its distribution as well as the characteristic parameters of grain boundary, resulting from the alteration of cooling rate, led to the changes in the properties of varistor ceramics.

关键词： varistor ZnO Dy2O3 microstructure electrical properties high-energy ball milling low-temperature sintering

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