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Improved direct current electrical properties of XLPE modified by graftable antioxidant and crosslinking coagent at a wide temperature range

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High Voltage 2024年第1期9卷 94-104页

作者： Xu yang Hong Zhao Chengcheng Zhang Chunyang Li Xindong Zhao jiaming yang Xuan Wang Key Laboratory of Engineering Dielectrics and Its Application Harbin University of Science and TechnologyHarbinChina

To enhance the DC electrical performance of cross-linked polyethylene(XLPE),the graftable antioxidant methacrylic acid 2-hydroxy-3-(4-anilinoanilino)propyl ester(GA),which contains carbonyl and amino groups,and the crosslinking coagent trimethylolpropane trimethacrylate(TMPTMA),which contains carbonyl groups,are individually or co-grafted onto *** slightly higher deep trap density introduced by higher grafting concentration of TMPTMA results in more significant suppression effect of conductance current and enhanced breakdown strength at a lower temperature,while the suppression effect for the conductance current at 90°C becomes weakened due to limited trap ***,the deeper energy level introduced by GA suppresses the conductance current and improves the electrical strength of XLPE at 90°C more *** co-grafting,the conductance current of XLPE in a wide range temperature can be significantly reduced,especially for the temperature dependence of conductance current,which is beneficial to suppress the field strength *** results of thermally stimulated current and molecular simulation show that the polar groups of two monomers introduce deep charge traps in *** co-grafting system ensures the rationality of the crosslinking reaction kinetics and does not affect the cable manufacturing.

关键词： crosslinking electrical grafting

T-Splines Based Isogeometric Topology Optimization with Arbitrarily Shaped Design Domains

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Computer Modeling in Engineering & Sciences 2020年第6期123卷 1033-1059页

作者： Gang Zhao jiaming yang Wei Wang yang Zhang Xiaoxiao Du Mayi Guo School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China Beijing Engineering Technological Research Center of High-Efficient&Green CNC Machining Process Beijing100191China

In this paper,a new isogeometric topology optimization(ITO)method is proposed by using T-splines based isogeometric analysis(IGA).The arbitrarily shaped design domains,directly obtained from CAD,are represented by a single T-spline surface which overcomes the topological limitations of Non-Uniform Rational B-Spline(NURBS).The coefficients correlated with control points are directly used as design ***,the T-spline basis functions applied for geometry description and calculation of structural response are simultaneously introduced to represent the density *** numerical examples show that the proposed approach leads to a coherent workflow to handle design problems of complicated *** optimized results are free of checkerboard patterns without additional stabilization and filtering techniques due to the properties of T-splines,which also simplified the *** addition,through performing local refinement,we can easily achieve multiresolution optimization and infill optimization within the T-splines based *** general,the proposed method provides a possibility to design,analyze,and optimize engineering structures in a uniform model,which has the potential to improve design efficiency and reduce the cost of product development.

关键词： Topology optimization isogeometric analysis unstructured T-splines Bézier extraction

Cerium and ruthenium co-doped La_(0.7)Sr_(0.3)FeO_(3-δ) as a high-efficiency electrode for symmetrical solid oxide fuel cell

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Journal of Rare Earths 2021年第9期39卷 1095-1099页

作者： Junkai Wang Lei Fu jiaming yang Ke Wu Jun Zhou Kai Wu Center of Nanomaterials for Renewable Energy State Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'an710049China

Symmetrical solid oxide fuel cells(SSOFCs)could be alternative energy conversion devices due to their simple fabrication process and low ***,perovskite La_(0.6)Ce_(0.1)Sr_(0.3)Fe_(0.95)Ru_(0.05O3-δ)(LCSFR)was synthesized and evaluated as a high-performance electrode for SSOFCs based on the electrolyte of La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ)(LSGM).LCSFR retains their stable perovskite crystal structure in both reducing and oxidizing atmospheres,though a minor amount of LaSrFeO4 phase is present under reducing *** investigation shows that homogeneously dispersed Ru metallic nanoparticles are exsolved on the surface of LCSFR after being *** polarization resistance(Rp)of LCSFR-CGO(Ce_(0.9)Gd_(0.1O2-δ))is about 0.11Ω·cm^(2)at 800℃in air,while the value of Rp for LCSFR-CGO in wet H_(2)(3%H_(2)O)increases up to 0.32Ω·cm^(2).The symmetrical LCSFR-CGOILSGMILCSFR-CGO cell demonstrates a performance with an open circuit potential(OCV)of 1.07 V and a maximum peak power density of 904 mW/cm^(2)at 800℃using wet H2 as the *** high performance indicates that LCSFR is a candidate electrode for SSOFCs.

关键词： Symmetrical electrode SSOFCs Exsolution Nanoparticle catalysts Rare earths

Optimisation method for carbon black distribution of polypropylene-based semi-conductive screen materials and its effect on charge emission behaviour at screen/insulation interface

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High Voltage 2023年第2期8卷 239-250页

作者： jiaming yang Rui Zhang Xu yang Zhi Sun Xindong Zhao Hong Zhao Xuan Wang Lin Li Heqian Liu Key Laboratory of Engineering Dielectrics and Its Application Harbin University of Science and TechnologyHarbinChina State Grid Heilongjiang Electric Power Company Limited Electric Power Research Institute State Grid Corporation of ChinaHarbinChina

The semi-conductive(SC)screen materials used in polypropylene(PP)-based cables are usually multi-component *** shows poor compatibility with carbon black(CB),and CB particles tend to disperse in the elastomer phase,which results in CB non-uniform dispersion in screen *** non-uniform distribution of CB will cause abnormal electric fields at the screen/insulation interface and affect insulation *** paper prepared modified PP grafted by molecule maleic anhydride,and four PP-based SC shielding materials were blended in combination with PP,PP-g-MAH,and thermoplastic elastomer(POE)as matrix *** CB distribution,electrical conductivity,and basic physical properties of the shielding material were *** screen materials were served as electrodes to test their effects on the space charge and conductivity characteristics of *** relationship between the macroscopic properties and the distribution characteristics of CB was *** show that the selective dispersion of CB in screen material was improved by PPg-MAH and the surface electric potential distribution was *** emission at the screen/insulation interface and conductivity can be reduced by homogenising the CB ***/PP-g-MAH/POE prepared in this paper exhibits relatively uniform CB distribution,which can reduce the charge emission from the screen/insulation interface.

关键词： insulation distribution interface

T-Splines for Isogeometric Analysis of Two-Dimensional Nonlinear Problems

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Computer Modeling in Engineering & Sciences 2020年第5期123卷 821-843页

作者： Mayi Guo Gang Zhao Wei Wang Xiaoxiao Du Ran Zhang jiaming yang School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China

Nonlinear behaviors are commonplace in many complex engineering applications,e.g.,metal forming,vehicle crash test and so *** paper focuses on the T-spline based isogeometric analysis of two-dimensional nonlinear problems including general large deformation hyperelastic problems and small deformation elastoplastic problems,to reveal the advantages of local refinement property of T-splines in describing nonlinear behavior of *** applying the adaptive refinement capability of T-splines during the iteration process of analysis,the numerical simulation accuracy of the nonlinear model could be increased *** Bézier extraction of the T-splines provides an element structure for isogeometric analysis that can be easily incorporated into existing nonlinear finite element *** addition,T-splines show great superiority of modeling complex geometries especially when the model is irregular and with hole *** numerical examples have been tested to validate the accuracy and convergence of the proposed *** obtained results are compared with those from NURBS-based isogeometric analysis and commercial software ABAQUS.

关键词： Isogeometric analysis T-splines nonlinear hyperelasticity elastoplasticity adaptive refinement

Tuning exsolution of nanoparticles in defect engineered layered perovskite oxides for efficient CO_(2) electrolysis

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Journal of Energy Chemistry 2023年第9期84卷 219-227页

作者： Zhengrong Liu Jun Zhou Yueyue Sun Xiangling Yue jiaming yang Lei Fu Qinyuan Deng Hongfei Zhao Chaofan Yin Kai Wu Center of Nanomaterials for Renewable Energy State Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049ShaanxiChina School of Chemistry University of St AndrewsSt AndrewsFife KY169STUK

Solid oxide electrolysis cell(SOEC) could be a potential technology to afford chemical storage of renewable electricity by converting water and carbon *** this work,we present the Ni-doped layered perovskite oxides,(La_(4)Sr_(n-4))_(0.9)Ti_(0.9n)Ni_(0.1n)O_(3n+2) with n=5,8,and 12(LSTNn) for application as catalysts of CO_(2) electrolysis with the exsolution of Ni nanoparticles through a simple in-situ growth *** is found that the density,size,and distribution of exsolved Ni nanoparticles are determined by the number of n in LSTNn due to the different stack structures of TiO_6 octahedra along the c *** Ni doping in LSTNn significantly improved the electrochemical activity by increasing oxygen vacancies,and the Ni metallic nanoparticles afford much more active *** results show that LSTNn cathodes can successfully be manipulated the activity by controlling both the n number and Ni *** these LSTNn(n=5,8,and 12),LSTN8 renders a higher activity for electrolysis of CO_(2) with a current density of 1.50A cm^(-2)@2.0 V at 800℃ It is clear from these results that the number of n in(La_(4)Sr_(n-4))_(0.9)Ti_(0.9n)Ni_(0.1n)O_(3n+2)with Ni-doping is a key factor in controlling the electrochemical performance and catalytic activity in SOEC.

关键词： Layered perovskite oxides In-situ growth SOEC Titanate

University Museum Flourishing

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China's Tibet 2003年第4期14卷 37-38页

作者： yang jiaming

When the Southwest University for Nationalities was first built in 1951,Wang Weizhou, Director of the Southwest Commission of Civil Affairs and President of the college contributed to the college for storage all the e... 详细信息

关键词：西南大学大学博物馆展厅馆藏资源管理机制

Cradle of the Gesar Culture

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China's Tibet 2005年第3期16卷 19-23页

作者： yang jiaming

EDITOR'S NOTE: Shiqu is located in the area inhabited by people of the Tibetan ethnic group. It is dose to the Gesar Cultural Area in Yushu and Golog of Qinghai, Qamdo of Tibet, Dege of Garze of Sichuan Province. Our visit to that part of the world not long ago shows that Dege is regarded as the hometown of Gesar, and Shiqu is the cradle of Gesar Culture.

关键词：葛萨尔文化民族文化藏族历史遗迹

Gesar Stone Carvings in Moska

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China's Tibet 2004年第4期15卷 9-13页

作者： yang jiaming

During the May Day of 2002, Li Xingxing, an associate research fellow of the Nationality Research Institute of Sichuan Province, a cameraman of the production team of a certain TV sta-tion of Sichuan, a number of teachers and students of Southwest Jiaotong University Architecture College and I, went to Dain-ba County for an inspection related to the application for world cultural relic

关键词：格萨王石雕艺术西藏艺术风格文化内涵