检索结果-南通市图书馆

Journal of Rare Earths 2021年第8期39卷 897-904页

作者： Haojun Qian Chenli Fan kaixin song Weitao Su Huanping Wang Qingming Huang College of Electronics Information Hangzhou Dianzi University.Hangzhou 310018China College of Sciences Hangzhou Dianzi UniversityHangzhou 310018China College of Materials Sciences and Engineering China Jiliang UniversityHangzhou 310018China Testing Center of Fuzhou University Fuzhou UniversityFuzhou 350116China

Blue-emitting phosphors Sr_(6)Ca_(4)(PO_(4))_(6) F_(2):Eu^(2+)(SCPF:Eu^(2+)),Sr_(6 )Ca_(4)(PO4)6 F_(2):Eu^(2+),Dy^(3+)(SCPF:Eu^(2+),Dy^(3+))and Sr_(6)Ca_(4)(PO4)6 F_(2):Eu^(2+),Dy^(3+),Si^(4+)(SCPF:Eu^(2+),Dy^(3+),Si^(4+)) with apatite structure were successfully synthesized by traditional solid-state reaction under reducing ***^(2+),Dy^(3+) and Si^(4+)ions occupy the corresponding sites of Sr^(2+),Ca^(2+) and P5+.Strong broad blue photo luminescence band is exhibited in SCPF:Eu^(2+),Dy^(3+) phosphor ranging from 400 to 550 nm centered at 455 nm and Dy^(3+) ions are vital in creating *** intensity of Eu^(2+),Dy^(3+) co-doped SCPF:0.02 Eu^(2+),0.02 Dy^(3+) is about 1.8 times that of SCPF:0.02 Eu^(2+) and electron trap centers serve as energy transporting *** further elucidate the formation and effect of the specific defect on the luminescence of SCPF:0.02 Eu^(2+),0.02 Dy^(3+) phosphor,the thermoluminescence properties,decay curves and thermal stability studies were performed while the Si^(4+)-P^(5+) charge compensated pho sphor SCPF:0.02 Eu^(2+),0.02 Dy^(3+),0.02 Si^(4+) was prepared as a *** the results of present work indicate that Dy^(3+) co-doping can obviously enhance photoluminescence intensity of SCPF:0.02 Eu^(2+) by the electron traps generated by non-equivalence replacement of Dy^(3+)-Ca^(2+).

关键词： Apatite Phosphor Thermoluminescence Charge compensation Rare earths

Luminescent ionic lattice occupation and wide tunable emission spectra of La_(2)MgZrO_(6):Bi^(3+),Eu^(3+)double perovskite phosphors for white light LED

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第4期41卷 489-497页

作者： Chen Yang Chenli Fan Fayaz Hussain Weiqing Sheng kaixin song Jun Wu Qingming Huang Weitao Su Junming Xu Shikuan Sun Dawei Wang College of Electronics Information Hangzhou Dianzi UniversityHangzhou 310018China Department of Materials Engineering NED University of Engineering and TechnologyMain University RoadKarachi75270Pakistan Testing Center of Fuzhou University Fuzhou UniversityFuzhou 350116China College of Sciences Hangzhou Dianzi UniversityHangzhou 310018China School of Material Science and Energy Engineering Foshan UniversityFoshan 528000China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesSciencesShenzhen 55China

La_(2)Mg_(1-x/2)Zr_(1-x/2)O_(6):xBi^(3+)(x=0.01-0.035,abbreviated as LMZ:Bi^(3+))and La_(2-y)Mg_(0.99)Zr_(0.99)O_(6):0.02Bi^(3+),yEu^(3+)(y=0.1-0.11,abbreviated as LMZ:Bi^(3+),Eu^(3+))double-perovskite phosphors were prepared through high-temperature solid-phase *** emission spectrum of LMZ:xBi^(3+)(x=0.01-0.035)phosphors excited at 353 nm is asymmetric in the range between 375 and 650 nm,showing strong green *** are two luminescent centers of[Mg1/Zr2-O_(6)]and[Mg2/Zr1-O_(6)]for Bi^(3+)occupation,which were analyzed through different excitation wavelengths,Gaussian fitting peaks,fluorescence decay curves and Rietveld refinement of powder X-ray diffraction *** deep study of the luminescent lattices in the LMZ matrix,the green to blue tunning-emission is observed by different excitation *** addition,red emission is obtained by co-doping Bi^(3+)/Eu^(3+),and adjustable emission was investigated by changing the content of Eu^(3+)in the co-doped phosphor formulation,so it is converted from green emission to red *** above results demonstrate how to tune emission color by co-doping rare earth ions in the double perovskite phosphor,which is attractive for future applications.

关键词： Double perovskite Phosphor Tunable emission Energy transfer Rare earths

A Multilayered Magnetoelectric Transmitter with Suppressed Nonlinearity for Portable VLF Communication

在线全文

学校读者我要写书评

暂无评论

Research 2024年第2期2023卷 553-563页

作者： Zhaoqiang Chu Zhineng Mao kaixin song Shizhan Jiang Shugang Min Wei Dan Chenyuan Yu Meiyu Wu Yinghui Ren Zhichao Lu Jie Jiao Tianxiang Nan Shuxiang Dong Qingdao Innovation and Development Base Harbin Engineering UniversityQingdao 266071China College of Underwater Acoustics Engineering Harbin Engineering UniversityHarbin 150001China songshan Lake Materials Laboratory DongguanGuangdong 523808 China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 201800China School of Integrated Circuits and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084China College of Engineering Peking UniversityBeijing 100871China

Acoustically actuated magnetoelectric(ME)antenna based on the efficient oscillation of magnetic dipoles has recently been considered as a promising solution for portable very-low-frequency ***,the severe nonlinear dynamic behavior in the case of strong-field excitation results in insufficient radiation capability and poor communication performance for a conventional ME *** this work,we propose to suppress the nonlinearity of an ME antenna by neutralizing the spring-hardening effect in amorphous Metglas and the spring-softening effect in piezoelectric ceramics through an ME multilayered transmitter(ME-MLTx)*** a driving voltage of 50 V_(pp)at the resonance frequency of 21.2 kHz,a magnetic flux density as high as 108 fT at a distance of 100 m is produced from a single *** addition,ME-MLTx performs a decreased mechanical quality factor(Q_(m))less than 40.65,and,thus,a broadened bandwidth of 500 Hz is ***,a communication link transmitting binary American Standard Code for Information Interchange-coded message is built,which allows for an error-free communication with a distance of 18 m and a data rate of 300 bit/s in the presence of heavy environment *** communication distance can be further estimated over 100 m when using a femtotesla-class-inductive magnetic field *** obtained results are believed to bring ME antennas one step closer to being applicable in very-low-frequency communications.

关键词： closer nonlinearity inductive

UltrahighQ Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)microwave dielectric ceramics for temperature-stable millimeter-wave dielectric resonator antennas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第2期13卷 155-165页

作者： Guoqiang He Yu Jiang kaixin song Yanjun Liu Yuan Nie Wenjie Zhang Ziqi Zhao Yinghan He Xinyue Ma Xiuli Chen Xu Li Huanfu Zhou Collaborative Innovation Centre for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of EducationSchool of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China College of Electronic Information Hangzhou Dianzi UniversityHangzhou 310018China

Microwave dielectric ceramics should be improved to advance mobile communication technologies *** this study,we prepared Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics with nonstoichiometric Sr^(2+)ratios based on our previously reported SrY_(2)O_(4) microwave dielectric ceramic,which has a low dielectric constant and an ultrahigh quality factor(Q value).The ceramic exhibited a 33.6% higher Q-by-frequency(Q×f)value(Q≈12,500)at x=0.02 than SrY_(2)O_(4).All Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics exhibited pure phase structures,although variations in crystal-plane spacings were *** ceramics are mainly composed of Sr-O,Y1-O,and Y_(2)-O octahedra,with the temperature coefficient of the resonant frequency(τ_(f))of the ceramic increasing with Y_(2)-O octahedral *** ceramic comprises uniform grains with a homogeneous elemental distribution,clear grain boundaries,and no obvious cavities at x=*** Sr_(1+x)Y_(2)O_(4+x)(x=0-0.04)ceramics exhibited good microwave dielectric properties,with optimal performance observed at x=0.02(dielectric constant(εr)=15.41,Q×f=112,375 GHz,and τ_(f)=-17.44 ppm/℃).The τ_(f) value was reduced to meet the temperaturestability requirements of 5G/6G communication systems by adding CaTiO_(3),with Sr_(1.02)Y_(2)O_(4.02)+2wt% CaTiO_(3) exhibiting ε_(r)=16.14,Q×f=51,004 GHz,andτf=0 ppm/℃.A dielectric resonator antenna prepared using Sr_(1.02)Y_(2)O_(4.02)+2wt%CaTiO_(3) exhibited a central frequency of 26.6 GHz,with a corresponding gain and efficiency of 3.66 dBi and 83.14%,***,Sr_(1.02)Y_(2)O_(4).02-based dielectric resonator antennas are suitable for use in 5G millimeter-wave band(24.5-27.5 GHz)applications.

关键词： millimeter wave microwave dielectric ceramics dielectric resonator antenna nonstoichiometric ratio

Lattice vibrational characteristics,crystal structures and dielectric properties of non-stoichiometric Nd_((1+x))(Mg_(1/2)Sn_(1/2))O_(3) ceramics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2020年第3期6卷 476-484页

作者： Zhikai Cao En-Cai Xiao Xue-Hui Li Zhenxing Yue Guohua Chen Ying Chen kaixin song Huanfu Zhou Ze-Ming Qi Feng Shi School of Material Science&Engineering Shandong University of Science and TechnologyQingdao266590China College of Arts and Design Shandong Jiaotong UniversityJinan250357China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin541004China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of Sciences1295 Dingxi RoadShanghai200050China School of Electronics Information Hangzhou Dianzi UniversityHangzhou310018China Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials School of Materials Science and EngineeringGuilin University of TechnologyGuilin541004China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei230029China Key Laboratory of Processing and Testing Technology of Glass&Functional Ceramics of Shandong Province School of Materials Science and EngineeringQilu University of Technology(Shandong Academy of Sciences)Jinan250353China

Non-stoichiometric Nd_((1+x))(Mg_(1/2)Sn_(1/2))O_(3)(-0.04=x≤0.04,NMS)ceramics were fabricated via a conventional solid-state reaction *** structures and morphologies were investigated by Xray diffraction(XRD)and scanning electron microscopy(SEM),*** main crystalline phase is monoclinic Nd(Mg_(1/2)Sn_(1/2))O_(3) with a double perovskite structure(P21/n space group)for the NMS system proved by *** sample at x=0.01 has the best crystallinity and evenly distributed crystal grains observed by *** optimum performances(ε_(r)=19.87,Q×f=41840 GHz,f=12.05 GHz)are obtained at x=*** vibrational modes of the Raman spectra were assigned and illustrated,in *** dielectric properties obtained by fitting infrared reflectance spectra with the help of four-parameter semi-quantum model are consistent with the calculated values by microscopic polarization and damping *** reverse translational vibration of the NdeMgO_(6),the F_(5u)^((5)) mode,provides the greatest contribution to the dielectric *** relationships between crystal structures and dielectric properties were mainly established using lattice vibrational modes as a media.

关键词： Microwave dielectric ceramics Non-stoichiometric Lattice vibrational characteristics Crystal structures Dielectric properties

Study on properties of ultra-low dielectric loss mPPO/MTCLT composites prepared by injection molding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2022年第3期12卷 28-34页

作者： Yahan Liu Haiyi Peng Xiaogang Yao Minmin Mao kaixin song Huixing Lin College of Electronic Information and Engineering Hangzhou Dianzi University 1158 Baiyang Street 2nd StreetHangzhou 310018P.R.China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of Ceramics Chinese Academy of Sciences588 Heshuo RoadShanghai 201800P.R.China

A novel category of polyphenylene oxide/high-impact polystyrene(PPO/HIPS)alloy was used as the polymer matrix(abbreviated as mPPO)and loaded with different volume fractions(0,10,20,30,40,50 vol.%)of MgTiO_(3)-Ca_(0.7)La_(0.2)TiO_(3)(abbreviated as MTCLT)ceramics to prepare composites by injection *** micromorphology,density,dielectric,thermal and mechanical properties were analyzed in *** experimental results show that the composites possess a compact microstructure because HIPS increases the fluidity of *** to the excellent dielectric properties of both mPPO and MTCLT,the composites have an extremely low dielectric *** realization of the high ceramic filler fraction greatly limits the thermal expansion of the polymer chain by introducing the interphase,so that the coefficient of thermal expansion of the composite material could be as low as 21.8 ppm/°*** the same time,the presence of ceramic particles could reinforce the mechanical property of the *** the ceramic filler fraction is higher than 20 vol.%,the bending strength of the composite material is around 110 *** the ceramic filler fraction is 40 vol.%,the composite possesses the best comprehensive *** dielectric constant is 6.81,the dielectric loss is 0.00104,the thermal expansion coefficient is as low as 25.3 ppm/°C,and the bending strength is 110.4 *** to its excellent properties,this material can be a good candidate in the field of microwave communication.

关键词： Injection molding composites dielectric properties polyphenylene oxide alloy

低介电常数(Mg_(1–x)Y_x)_2Al_4Si_5O_(18)陶瓷的制备与微波介电性能

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

硅酸盐学报 2015年第9期43卷 1203-1208页

作者：王闳毅刘鹏魏金生吴松宋开新杭州电子科技大学电子信息学院电子材料与器件重点实验室杭州310018

采用传统陶瓷固相反应烧结法制备(Mg1–xYx)2Al4Si5O18陶瓷。Y3+掺杂产生液相烧结作用,使得堇青石陶瓷的烧结温度从1 450℃降低到1 325℃。结果表明:(Mg1–xYx)2Al4Si5O18陶瓷在0≤x<0.05范围内,以(Mg,Y)2Al4Si5O18固溶体形式存在;在0.0... 详细信息

采用传统陶瓷固相反应烧结法制备(Mg1–xYx)2Al4Si5O18陶瓷。Y3+掺杂产生液相烧结作用,使得堇青石陶瓷的烧结温度从1 450℃降低到1 325℃。结果表明:(Mg1–xYx)2Al4Si5O18陶瓷在0≤x<0.05范围内,以(Mg,Y)2Al4Si5O18固溶体形式存在;在0.05≤x<0.25范围内,以Mg2Al4Si5O18/Y2Si2O7复相陶瓷形式存在。Y3+能够改善(Mg1–xYx)2Al4Si5O18陶瓷的颗粒尺寸分布,并使陶瓷的气孔率降低。(Mg1–xYx)2Al4Si5O18陶瓷的相对介电常数由x=0的6.15提高到x=0.05的6.31;然后逐渐降低至x=0.25的5.90。品质因数Qf值由x=0的33 000 GHz提高到x=0.05的41 000 GHz,然后降低至x=0.25的24 000 GHz。谐振频率温度系数(0.05≤x<0.25)值从–32×10–6/℃提高到–24×10–6/℃。

关键词：堇青石低介电常数微波介电性能

在线全文

学校读者我要写书评

暂无评论

微波铁氧体材料及其应用

材料导报 2009年第11期23卷 45-49页

作者：宋开新徐军明郑梁应智花武军秦会斌杭州电子科技大学电子信息学院工业与信息化产业部电子信息材料与器件重点实验室杭州310018

总结和评述了近年来国际国内微波铁氧体材料及其应用研究发展动态。特别是随着材料制备技术与电子通信技术的集成化、高频与宽频化以及MMIC集成电路工艺的快速发展,作为现代通信与军事系统中的关键元器件,新结构体系的微波铁氧体材料在... 详细信息

总结和评述了近年来国际国内微波铁氧体材料及其应用研究发展动态。特别是随着材料制备技术与电子通信技术的集成化、高频与宽频化以及MMIC集成电路工艺的快速发展,作为现代通信与军事系统中的关键元器件,新结构体系的微波铁氧体材料在米波-毫米波段领域的应用也得到不断的更新。设计与制备出可用于各频带的超小型化、高性能和超宽带高性能器件的新结构新体系铁氧体材料是微波铁氧体材料的开发研究方向。

关键词：微波铁氧体应用

考虑CO_(2)吸附和滑脱效应影响的页岩渗透率演化机制研究

在线全文

学校读者我要写书评

暂无评论

实验力学 2024年第1期39卷 115-125页

作者：吴迪宋开鑫曹启坤翟文博苗丰辽宁工程技术大学力学与工程学院辽宁阜新123000 辽宁工程技术大学土木工程学院辽宁阜新123000

为探究气体吸附以及滑脱效应对页岩渗透率的影响规律,利用自主研制的渗流装置,开展了CO_(2)的脉冲衰减渗流试验。试验结果表明:在低孔隙压力下,CO_(2)吸附对渗透率计算结果影响较大,随着孔隙压力增大,CO_(2)吸附对渗透率的影响逐渐减小... 详细信息

为探究气体吸附以及滑脱效应对页岩渗透率的影响规律,利用自主研制的渗流装置,开展了CO_(2)的脉冲衰减渗流试验。试验结果表明:在低孔隙压力下,CO_(2)吸附对渗透率计算结果影响较大,随着孔隙压力增大,CO_(2)吸附对渗透率的影响逐渐减小;通过修正后的滑脱效应渗流公式对渗透率进行拟合,发现修正后的滑脱效应公式与渗透率变化趋势更加贴合;利用滑脱效应贡献率量化分析滑脱效应对渗透率的影响规律,孔隙压力为2.5MPa~4MPa时,滑脱效应对渗透率影响较大,贡献率达到27.78%,随着孔隙压力的增大,贡献率逐渐下降至8.44%,在低孔隙压力条件下,滑脱效应影响更加明显,随着孔隙压力的增大,滑脱效应影响呈指数形式逐渐减小。

关键词：页岩吸附性滑脱效应渗透率孔隙度

在线全文

学校读者我要写书评

暂无评论

综合OSAL的ZigBee协议栈设计

杭州电子科技大学学报（自然科学版） 2015年第6期35卷 32-35页

作者：郑海杰宋开新杭州电子科技大学新型电子器件与应用研究所浙江杭州310018

介绍了在IEEE802.15.4协议标准和ZigBee协议栈架构的基础上,结合OSAL事件轮询机制和多任务处理机制的ZigBee协议栈设计。将触发事件与事件处理函数形成映射,由操作系统抽象层OSAL进行管理,实现任务调度和处理、数据发送和接收。实验结... 详细信息

介绍了在IEEE802.15.4协议标准和ZigBee协议栈架构的基础上,结合OSAL事件轮询机制和多任务处理机制的ZigBee协议栈设计。将触发事件与事件处理函数形成映射,由操作系统抽象层OSAL进行管理,实现任务调度和处理、数据发送和接收。实验结果表明,该ZigBee协议栈能建立稳定的星型网络拓扑结构,数据在网络中能正确发送和接收。

关键词：无线通信操作系统抽象层无线射频星型网络拓扑结构