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Synergically enhanced piezocatalysis performance of eco-friendly(K_(0.52)Na_(0.48))NbO_(3) through ferroelectric polarization and defects

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International Journal of Minerals,Metallurgy and Materials 2023年第10期30卷 2044-2054页

作者： Min Zhou laijun liang Dingze Lu Xiaomei Lu Zheng Wang Fengzhen Huang Pengfei Cheng Dongdong Liu Mengqi Tian Qiuping Wang Yunjie Zhang School of Science Xi’an Polytechnic UniversityXi’an 710048China National Laboratory of Solid State Microstructures and Physics School Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710126China National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringSoochow UniversitySuzhou 215123China

Piezocatalysis has attracted unprecedented research interest as a newly emerging catalysis ***,the inherent insulating property of ferroelectric materials ultimately leads to the poor vibration-electricity conversion ***,this work reports the(K_(0.52)Na_(0.48))NbO_(3) ferroelectric ceramics(KNNFCx),for which the FeCo modification strategy is *** substitution of the moderate amount of FeCo(x=0.015)at Nb site not only optimizes ferroelectricity but also produces beneficial defects,notably increasing Rhodamine B water purification efficiency to 95%.The pinning effect of monovalent oxygen vacancies on ferroelectric domains is responsible for the excellent ferroelectric polarization of KNNFC0.015 through the generation of an internal field to promote charge carriers separation and reduce nonradiative ***,the accompanying electron carriers can easily move to the material surface and participate in redox reactions because they have low activation ***,ferroelectric polarization and defects play synergetic roles in enhancing piezocatalytic performance.

关键词： piezocatalytic water purification ferroelectric polarization beneficial defects

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Impact of asymmetric activity on interactions between information diffusion and disease transmission in multiplex networks

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Communications in Theoretical Physics 2023年第7期75卷 1-14页

作者： Xiaoxiao Xie liang’an Huo laijun Zhao Ying Qian Business School University of Shanghai for Science and TechnologyShanghai 200093China

Disease is a serious threat to human *** the characteristics of disease transmission is helpful for people to effectively control *** real life,it is natural to take various measures when people are aware of *** this paper,a novel coupled model considering asymmetric activity is proposed to describe the interactions between information diffusion and disease transmission in multiplex ***,the critical threshold for disease transmission is derived by using the micro-Markov chain ***,the theoretical results are verified by numerical *** results show that reducing the activity level of individuals in the physical contact layer will have a continuous impact on reducing the disease outbreak threshold and suppressing the *** addition,the activity level of individuals in the virtual network has little impact on the transmission of the ***,when individuals are aware of more disease-related information,the higher their awareness of prevention will be,which can effectively inhibit the transmission of *** research results can provide a useful reference for the control of disease transmission.

关键词： asymmetric activity information diffusion disease transmission activity level multiplex networks

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Achieving enhanced energy storage performance and ultra-fast discharge time in tungsten–bronze ceramic

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Journal of Advanced Ceramics 2024年第9期13卷 1349-1358页

作者： Yuejun Dan Liupan Tang Wenzhi Ning Yingzhi Meng Changzheng Hu laijun Liu liang Fang Key Laboratory of New Processing Technology for Nonferrous Metal&Materials Ministry of EducationCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China Guangxi Key Laboratory of Optical and Electronic Materials and Devices Guilin University of TechnologyGuilin 541004China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi Guilin University of TechnologyGuilin 541004China

The rapid development of capacitors with high energy density and efficiency has been driven by advanced electronic systems and innovative pulsed power *** this study,we prepared Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=2.5,3,3.5,4,4.5)dielectric ceramics,which exhibited structural distortion due to the co-occupation of Ba^(2+),Sr^(2+),and Sm^(3+)in the A-site and the partial substitution of Nb^(5+)by Zr^(4+)in the *** ordered/disordered distribution due to these distortions thus generated polar nanoregions(PNRs)and induced a relaxation ferroelectric behavior,which was verified by the high-resolution transmission electron *** the use of the Vogel–Fulcher and Maxwell–Boltzmann equations,we found that easy inversion and small dipole sizes are crucial for achieving high energy storage density and *** Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=3.5)dielectric ceramic displayed a ferroelectric/paraelectric transition near room *** ferroelectric testing revealed large energy storage density(Wrec=4.31 J·cm^(−3))and high efficiency(η=93.8%)at 310 kV·cm−***,Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=4.5)exhibited higher breakdown field strength due to its large resistivity and small grain *** led to energy storage density of approximately 5.3 J·cm^(−3)at 460 kV·cm^(−1).Additionally,Sr_(4.5−x)Ba_(x)Sm_(0.5)Zr_(0.5)Nb_(9.5)O_(30)(x=3.5)demonstrated current density(CD)of approximately 713.38 A·cm^(−2)and power density(PD)of approximately 87.51 MW·cm^(−3),with ultrafast discharge time of 34 ns and excellent discharge energy density(Wdis)of approximately 2.27 J·cm^(−3).Overall,this study presents a promising approach for developing dielectric ceramic materials that hold potential for applications in innovative pulsed power components.

关键词： large energy storage high efficiency ultra-fast discharge time tungsten-bronze structure

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Structure evolution,dielectric,and conductivity behavior of(K_(0.5)Na_(0.5))NbO_(3)-Bi(Zn_(2/3)Nb_(1/3))O_(3) ceramics

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Journal of Advanced Ceramics 2021年第4期10卷 809-819页

作者： Tianxiang YAN Kaiyuan CHEN Chengqi LI Min LIU Jie WANG liang FANG laijun LIU College of Mechanical and Control Engineering&College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China Institute of Fluid Engineering Equipment Jiangsu Industrial Technology Research InstituteJiangsu UniversityZhenjiang 212013China Key Laboratory for RF Circuits and Systems Ministry of Education&Key Laboratory of Large Scale Integrated DesignHangzhou Dianzi UniversityHangzhou 310018China

(1-x)K_(0.5)Na_(0.5)Nb0_(3-x)Bi(Zn_(2/3)Nb_(1/3))0_(3)((1-x)KNN-xBZN,x=0.010,0.015,0.020,0.025,and 0.030)lead-free ceramics were fabricated via a traditional solid-state *** crystal structure,microstructure,dielectric,and conductivity behavior of this system were *** with X-ray diffraction(XRD)patterns,Rietveld refinement,and dielectric spectroscopy,an orthorhombic phase was determined for x=0.010,an orthorhombic-tetragonal mixed phase was identified for x=0.015,and a rhombohedral symmetry appears in 0.020≤x≤*** 0.98KNN-0.02BZN and 0.975KNN-0.025BZN ceramics exhibit stable permittivity and low dielectric loss tangent(tan)in wide temperature ranges owing to the combination of rhombohedral-tetragonal step-like feature and the diffuse phase transition from tetragonal to *** activation energies of dielectric relaxation and conductivity behavior at high temperatures initially decrease slightly,then drop sharply,and finally decline slowly,which could be attributed to microstructure morphologies and the concentration of oxygen vacancies.

关键词： ceramic crystal structure dielectric spectroscopy oxygen vacancies

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Dielectric Properties of Unfilled Tetragonal Tungsten Bronze Ba4PrFe(0.5)Nb(9.5)O(30) Ceramics

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Journal of Wuhan University of Technology(Materials Science) 2017年第4期32卷 904-909页

作者：胡长征 ZHU Qihua SUN Zhen GUO Zhe LIU laijun FANG liang Ministry-province Jointly-constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials Guangxi Zhuang Autonomous Region Guilin University of Technology Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education Guilin University of Technology Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices College of Material Science and Engineering Guilin University of Technology

In order to found new dielectrics ceramics in tungsten bronze structure, unfilled tungsten bronze（TB） ceramics with nominal formula Ba4PrFe（0.5）Nb（9.5）O（30） were prepared by the solid state reaction method. The microstructure and dielectric properties were studied using powder X-ray diffraction, field emission scanning electron microscope, and variable temperature dielectric test system. The results show that the ceramics have a single phase and belong to the space group of P4bm with the cell of a = b = 12.4839（3）？, c = 3.9409（5）？, V = 614.192（2）？3. The frequency dependent dielectrics properties show that the ceramics have a Debye-like relaxation at room temperature, while the temperature dependent dielectrics properties indicate that the ceramics are a relaxor and the relaxation is due to the nanopolars and oxygen vacancies. The ceramics have a potential application in electronic ceramics as temperature-stable multilayer ceramic capacitors.

关键词： unfilled tetragonal tungsten bronze dielectric properties ceramic

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Influence of interface point defect on the dielectric properties of Y doped CaCu_(3)Ti_(4)O_(12) ceramics

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Journal of Advanced Dielectrics 2016年第1期6卷 74-82页

作者： Jianming Deng Xiaojun Sun Saisai Liu laijun Liu Tianxiang Yan liang Fang Brahim Elouadi Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education Guilin University of TechnologyGuilin 541004P.R.China College of Materials Science and Engineering Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and DevicesGuilin University of Technology Guilin 541004P.R.China Laboratory of Chemical Analysis Elaboration and Materials Engineering(LEACIM)Universite de La RochelleAvenue Michel Crepeau17042 La Rochelle Cedex 01France

CaCu_(3)Ti_(4-x)Y_(x)O_(12)(0≤x≤0.12)ceramics were fabricated with conventional solid-state reaction *** structure and microstructure of prepared ceramics were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM),*** impedance and modulus tests both suggested the existence of two different relaxation behavior,which were attributed to bulk and grain boundary *** addition,the conductivity and dielectric permittivity showed a step-like behavior under 405 ***,frequency independence of dc conduction became dominant when above 405 *** CCTO ceramic,rare earth element Y^(3+)ions as an acceptor were used to substitute Ti sites,decreasing the concentration of oxygen vacancy around grainelectrode and grain *** reason to the reduction of dielectric behavior in low frequencies range was associated with the Y doping in CCTO ceramic.

关键词： CaCu_(3)Ti_(4)O_(12) grain boundary bulk conduction electrochemical techniques dispersion dielectric properties

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质子交换膜电解槽控制策略研究

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电工技术学报 2023年第17期38卷 4787-4799页

作者：李建林梁忠豪李光辉陈来军北京未来电化学储能系统集成技术创新中心(北方工业大学) 北京100144 电力系统及发电设备控制和仿真国家重点实验室(清华大学) 北京100084 青海省清洁能源高效利用重点实验室(青海大学新能源光伏产业研究中心) 西宁810016

目前氢能已成为支撑新型电力系统发展的洁净能源载体,光伏电解水制氢技术是制氢的最佳方式之一。针对光伏电解水制氢系统中的关键设备质子交换膜电解槽(PEMEL),结合其非线性、时变性、强耦合、多输入多输出的设备特性和运行特性,以PEME... 详细信息

目前氢能已成为支撑新型电力系统发展的洁净能源载体,光伏电解水制氢技术是制氢的最佳方式之一。针对光伏电解水制氢系统中的关键设备质子交换膜电解槽(PEMEL),结合其非线性、时变性、强耦合、多输入多输出的设备特性和运行特性,以PEMEL动态模型为研究对象,对其控制策略进行研究,包括比例积分微分(PID)控制、鲁棒控制、模型预测控制(MPC)、容错控制(FTC)策略,分析这四种控制策略的结构和优缺点,并从平稳性、精度、计算复杂度和响应速度四个维度对每类控制策略进行单独评价,为PEMEL控制技术研究及氢能领域的发展提供新的借鉴思路。

关键词：制氢质子交换膜电解槽 PID控制鲁棒控制模型预测控制容错控制

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白念珠菌高铁还原酶FRP1基因的功能

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微生物学报 2009年第3期49卷 337-342页

作者：梁勇郑雯魏东盛邢来君李明春南开大学微生物学系分子微生物学与技术教育部重点实验室天津300071

白念珠菌(Candida albicans)获得铁的能力影响细胞的生长和毒力,高铁还原酶是白念珠菌高亲和铁吸收系统的重要组成部分。【目的】构建高铁还原酶FRP1(Ferric reductase protein)基因缺失突变株,对FRP1基因功能进行初步研究。【方法】使... 详细信息

白念珠菌(Candida albicans)获得铁的能力影响细胞的生长和毒力,高铁还原酶是白念珠菌高亲和铁吸收系统的重要组成部分。【目的】构建高铁还原酶FRP1(Ferric reductase protein)基因缺失突变株,对FRP1基因功能进行初步研究。【方法】使用Northern杂交的方法分析FRP1基因在缺铁和富铁条件下的表达。利用PCR介导的基因敲除技术构建frp1缺失突变株,并且对野生型和缺失突变株在细胞高铁还原酶活性以及缺铁条件下的生长情况进行比较分析。【结果】缺铁条件可以诱导FRP1基因的表达。frp1缺失突变株不能在铁缺陷的固体培养基上生长。【结论】FRP1蛋白可能是白念珠菌在缺铁条件下起主要作用的高铁还原酶。

关键词：白念珠菌高铁还原酶 FRP1基因

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利用定点突变分析白念珠菌依赖铁基因FRP1启动子元件

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生物工程学报 2008年第8期24卷 1348-1353页

作者：桂磊梁勇魏东盛郑雯邢来君李明春南开大学微生物学系分子微生物学与技术教育部重点实验室天津300071

通过对白念珠菌高铁还原酶基因FRP1启动子进行突变分析,确认启动子中特殊调控元件。我们通过分析FRP1起始密码子上游1000bp序列发现在-160和-650处有2个推测的Rim101p结合位点,对其分别进行定点突变,然后构建启动子与报告基因LacZ融合质... 详细信息

通过对白念珠菌高铁还原酶基因FRP1启动子进行突变分析,确认启动子中特殊调控元件。我们通过分析FRP1起始密码子上游1000bp序列发现在-160和-650处有2个推测的Rim101p结合位点,对其分别进行定点突变,然后构建启动子与报告基因LacZ融合质粒,转化整合到白念珠菌rim101-/-株和野生株中,检测不同缺铁条件下β-半乳糖苷酶活性。结果发现碱性条件,Rim101p能够正向调控FRP1的表达;启动子-160处突变对启动子功能影响较弱,而-650突变使启动子活性大大降低,此结果和双突变的结果相同,表明Rim101p主要通过与启动子-650处结合位点相互作用来调控FRP1的表达。

关键词：定点突变白念珠菌 Rim101蛋白高铁还原酶基因

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可再生能源虚拟同步发电机并网振荡模式及影响因素分析

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可再生能源 2021年第5期39卷 673-680页

作者：程亮朱寰郭岩郑天文汪洋陈来军国网江苏省电力有限公司江苏南京211106 清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室北京100084 北京清能互联科技有限公司北京100084

虚拟同步发电机能使逆变器模拟同步发电机运行特性,有利于可再生能源发电友好并网。但由于虚拟同步发电机兼具同步发电机与逆变器的特点,并网运行时,有可能面临振荡风险,且振荡类型和形式更加复杂。文章首先介绍了虚拟同步机电路拓扑及... 详细信息

虚拟同步发电机能使逆变器模拟同步发电机运行特性,有利于可再生能源发电友好并网。但由于虚拟同步发电机兼具同步发电机与逆变器的特点,并网运行时,有可能面临振荡风险,且振荡类型和形式更加复杂。文章首先介绍了虚拟同步机电路拓扑及多环控制的结构特点;在此基础上,分析了VSG电流内环、功率外环、VSG并联运行等影响因素与不同振荡频率之间的关系。建立了不同影响因素主导情况下的小信号模型,系统地分析了VSG并网运行时存在的高频、工频和低频振荡模式。最后,通过Matlab/Simulink仿真,验证了VSG并网时不同振荡模式与相应主导影响因素之间的关联关系。

关键词：虚拟同步发电机高频振荡工频振荡低频振荡

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