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Moderate Fields, Maximum Potential: Achieving High Records with Temperature‑Stable Energy Storage in Lead‑Free BNT‑Based Ceramics

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Nano-Micro Letters 2024年第5期16卷 184-200页

作者： Wenjing Shi Leiyang Zhang Ruiyi Jing Yunyao Huang Fukang Chen Vladimir Shur Xiaoyong Wei Gang Liu hongliang du Li Jin Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Materials and Energy Southwest UniversityChongqing 400715People’s Republic of China School of Natural Sciences and Mathematics Ural Federal UniversityEkaterinburg 620000Russia Multifunctional Electronic Ceramics Laboratory College of EngineeringXi’an International UniversityXi’an 710077People’s Republic of China

The increasing awareness of environmental concerns has prompted a surge in the exploration of leadfree,high-power ceramic *** efforts to develop leadfree dielectric ceramics with exceptional energystorage performance(ESP)have predominantly relied on multicomponent composite strategies,often accomplished under ultrahigh electric ***,this approach poses challenges in insulation and system downsizing due to the necessary working voltage under such *** extensive study,bulk ceramics of(Bi_(0.5)Na_(0.5))TiO_(3)(BNT),a prominent lead-free dielectric ceramic family,have seldom achieved a recoverable energy-storage(ES)density(Wrec)exceeding 7 J cm^(−3).This study introduces a novel approach to attain ceramic capacitors with high ESP under moderate electric fields by regulating permittivity based on a linear dielectric model,enhancing insulation quality,and engineering domain structures through chemical formula *** incorporation of SrTiO_(3)(ST)into the BNT matrix is revealed to reduce the dielectric constant,while the addition of Bi(Mg_(2/3)Nb_(1/3))O_(3)(BMN)aids in maintaining ***,the study elucidates the methodology to achieve high ESP at moderate electric fields ranging from 300 to 500 kV cm^(−1).In our optimized composition,0.5(Bi_(0.5)Na_(0.4)K_(0.1))TiO_(3)–0.5(2/3ST-1/3BMN)(B-0.5SB)ceramics,we achieved a Wrec of 7.19 J cm^(−3) with an efficiency of 93.8%at 460 kV cm^(−1).Impressively,the B-0.5SB ceramics exhibit remarkable thermal stability between 30 and 140℃ under 365 kV cm^(−1),maintaining a Wrec exceeding 5 J cm^(−3).This study not only establishes the B-0.5SB ceramics as promising candidates for ES materials but also demonstrates the feasibility of optimizing ESP by modifying the dielectric constant under specific electric field ***,it provides valuable insights for the future design of ceramic capacitors with high ESP under constraints of limited electric field.

关键词： BNT Energy storage Lead-free Relaxor ferroelectrics Capacitors

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大跨度钢桁架人行桥舒适度探讨

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四川水力发电 2024年第3期43卷 71-76,83页

作者：杜洪亮中国电建集团成都勘测设计研究院有限公司四川成都611130

对大跨度钢桁架人行桥的约束条件、桁架高度、人行道位置、桁架杆件截面尺寸等因素进行分析,从中选出对人行桥的自振频率影响最敏感的因素。结合实际情况优化设计方案,人行桥的自振频率不满足中国相关规范规定时,通过对国际主流规范的分... 详细信息

对大跨度钢桁架人行桥的约束条件、桁架高度、人行道位置、桁架杆件截面尺寸等因素进行分析,从中选出对人行桥的自振频率影响最敏感的因素。结合实际情况优化设计方案,人行桥的自振频率不满足中国相关规范规定时,通过对国际主流规范的分析,发现德国规范操作性强和适用性广,故可以按照德国规范对大跨度钢桁架人行桥进行舒适性分析,笔者对不满足德国规范舒适性要求的情况,进行了阻尼器设计,并提出了调频桥面板的设计展望。

关键词：人行桥大跨度钢桁架舒适度分析调频桥面板

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四方相锆钛酸铅陶瓷制备及温度稳定性研究

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压电与声光 2024年第3期46卷 351-355页

作者：杨洋侯育冬杜红亮张阿梅侯鸿平北京工业大学材料科学与工程学院北京100124 西安外事学院多功能电子陶瓷材料研究中心陕西西安710077

采用传统固相法制备了Pb(Zr_(1-x)Ti_(x))O_(3)陶瓷,通过调节锆钛摩尔比将其定位于四方区域以改善温度稳定性,并通过优化烧结温度改善电学性能。实验结果表明,当x=0.52时,体系处于四方区域,此时陶瓷的温度稳定性有所提升,在室温~300℃时... 详细信息

采用传统固相法制备了Pb(Zr_(1-x)Ti_(x))O_(3)陶瓷,通过调节锆钛摩尔比将其定位于四方区域以改善温度稳定性,并通过优化烧结温度改善电学性能。实验结果表明,当x=0.52时,体系处于四方区域,此时陶瓷的温度稳定性有所提升,在室温~300℃时,d33变化率为±14.7%。在1250℃下烧结的Pb(Zr_(0.48)Ti_(0.52))O_(3)陶瓷具有最佳的电学性能:压电常数d_(33)=183 pC/N,居里温度TC=402℃,相对介电常数ε_(r)=1209。

关键词：压电陶瓷锆钛酸铅四方相温度稳定性烧结温度

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The contribution of cultivated land occupation by construction to China＇s economic growth

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Journal of Geographical Sciences 2011年第5期21卷 897-908页

作者： YANG Ke CHEN Baiming du hongliang TANG Xiumei Institute of Urban Development of Pan-China Construction Group Beijing 100070 China Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Institute of Scientific and Technical Information of China Beijing 100038 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The paper applies Cobb-Douglas Production Function and Solow-Swan Model to constructing the calculation model of the contribution rate of cultivated land occupation by construction （CLOC） to China＇s economic growth,and analyzes the contribution change of CLOC to China＇s economic growth qualitatively and *** main conclusions are as follows：1） From 1989 to 2007,the contribution rates of capital,labor,and CLOC to China＇s economic growth were 45.76%,8.47%,and 6.19% respectively.2） From the period 1989-1996 to the period 1997-2007 the contribution rate of CLOC to China＇s economic growth increased from 5.40% to 5.87%.The degree of contribution was enhanced significantly.3） The contribution of CLOC to China＇s economic growth had a spatial distribution characteristic that the contribution rate of eastern coastal regions was the highest,that of central regions came second,and that of western regions the *** paper indicates that in order to enhance the contribution of CLOC to China＇s economic growth,some relevant economic and administrative measures might be taken,and land might be used intensively and economically to increase land economic *** cost of promoting gross domestic product （GDP） growth might be reduced as much as possible to achieve higher GDP growth and lower land resource consumption.

关键词： cultivated land occupation by construction economic growth contribution production function

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深大竖井开挖稳定性数值模拟分析

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科技通报 2024年第9期40卷 93-98页

作者：杜红亮常小兵傅鹤林姚涛中铁一局集团第五工程有限公司陕西宝鸡721013 中南大学土木工程学院长沙410075 湖南省芷铜高速公路建设开发有限公司湖南芷江419100

依托芷铜高速椿木山隧道通风竖井工程,针对竖井施工对围岩造成的扰动影响以及初期支护受力情况进行数值模拟分析,探明了竖井开挖中围岩最危险区以及初期支护参数的合理性,并根据分析结果提出相应的加固或处理措施。结果表明:竖井施工对... 详细信息

依托芷铜高速椿木山隧道通风竖井工程,针对竖井施工对围岩造成的扰动影响以及初期支护受力情况进行数值模拟分析,探明了竖井开挖中围岩最危险区以及初期支护参数的合理性,并根据分析结果提出相应的加固或处理措施。结果表明:竖井施工对围岩造成的扰动较小,围岩不会出现明显的塑性区,揭示了在开挖并施作初期支护后,围岩具有一定的稳定性;随着开挖深度的加大,岩体最大应力也在增大,在竖井底部达到最大值3.36 MPa,地表沉降曲线呈现出明显的V形特征,中间沉降量大,越远离中部开挖区,沉降量越小;不同性质的围岩过渡区会出现应力突变,在实际操作中应加强围岩过渡区的支护与监测频率。

关键词：公路隧道竖井施工围岩扰动初期支护数值模拟

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Fabrication and Performances of 1-3-2 Piezoelectric Ceramic/Polymer Composite

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稀有金属材料与工程 2006年第A3期35卷 511-513页

作者： Likun Wang Guang Li hongliang du Lei Qin Shuxiang Li Sensor Technology Research Center Beijing Information Technology Institute Beijing 100101 China National Ocean Technology Center Tianjin 300111 China

A novel 1-3-2 piezoelectric composite has been developed,which consists of piezoelectric ceramic plate and 1-3 piezoelectric *** composite was fabricated by dicing PZT ceramic along mutual perpendicular two directions and then filling epoxy into *** piezoelectric and electromechanical properties of the novel composite were determined. The results show a coefficient d_ (33) of 405pC/N,a vibration displacement of 113.5pm,an acoustic impendence of 13.3 Mraly, a bandwidth of 12kHz and a thickness electromechanical coupling coefficient of 0.56.

关键词： 1-3-2 piezoelectric composite fabrication performances

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Improvement in the piezoelectric temperature stability of(K_(0.5)Na_(0.5))NbO_3 ceramics

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Chinese Science Bulletin 2011年第22期56卷 2389-2393页

作者： ZHAO JingBo du hongliang QU ShaoBo ZHANG HongMei XU Zhuo The College of Science Air Force Engineering University Xi'an 710051 China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China Electronic Materials Research Laboratory Key Laboratory of Educational Ministry Xi'an Jiaotong University Xi'an 710049 China

Through an analysis of the temperature stability of(K0.5Na0.5)NbO3(KNN)based ceramics and KNN solid solutions,we propose a method to enhance the temperature stability of KNN *** materials are valuable for their piezoelectric *** verify the feasibility of this method,0.9(K1-xNax)NbO3-0.06LiNbO3-0.04CaTiO3(KNLN-CaTiO3)ceramics were designed,and their structure and properties were *** results show that KNLN-CaTiO3(x=0.54)ceramics have a good temperature stability over a wide temperature range(25-320°C).Also,they have good piezoelectric properties(d33=152 pC/N in x=0.54).This result confirms the feasibility of our proposed solution for improving the piezoelectric properties of KNN-based ceramics that have poor temperature stability.

关键词：温度稳定性压电性能陶瓷设计 CaTiO3 KNN 温度范围材料

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椿木山特长隧道施工风险评估及精细化施工方案研究

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科技通报 2024年第4期40卷 77-83页

作者：唐盛刘坤薛沛杜红亮易海东傅鹤林湖南省高速公路集团有限公司长沙410031 中铁一局集团有限公司西安361001 中南大学长沙410075

为提高特长隧道的施工效率,降低施工成本,本文依托椿木山特长隧道开展风险评估及精细化施工技术研究。分析了该隧道施工的重难点,结合各种风险源对隧道风险进行评估。基于隧道施工工艺,从人力安排和施工工时多角度分析了“七台套”大机... 详细信息

为提高特长隧道的施工效率,降低施工成本,本文依托椿木山特长隧道开展风险评估及精细化施工技术研究。分析了该隧道施工的重难点,结合各种风险源对隧道风险进行评估。基于隧道施工工艺,从人力安排和施工工时多角度分析了“七台套”大机作业的实施成效。并根据多种因素对比各种竖井布置方案的经济效益。结果表明:(1)隧道风险评估仅考虑单一风险忽视作业风险会使得风险出现不可控现象,应从地层、水文及技术水平等多角度分析;(2)与传统钻爆法施工相比,大机作业施工在降低人力成本和提高施工效率方面都具有明显优势;(3)竖井布置方案应在满足正常运营通风条件下选择埋深短、施工方便、经济效益好的方案。本文的研究成果为椿木山隧道施工提供了技术支持,也可为类似隧道提供技术参考,有助于大机作业推广。

关键词：特长隧道施工技术大机作业竖井

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Polarization insensitive metamaterial absorber based on E-shaped all-dielectric structure

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Journal of Advanced Dielectrics 2015年第1期5卷 65-70页

作者： Liyang Li Jun Wang Hua Ma Jiafu Wang hongliang du Shaobo Qu College of Science Air Force Engineering UniversityXi'an 710051 ShaanxiP.R.China

In this paper,we designed a metamaterial absorber performed in microwave frequency *** absorber is composed of E-shaped dielectrics which are arranged along different *** E-shaped all-dielectric structure is made of microwave ceramics with high permittivity and low *** about 1 GHz frequency band,more than 86%absorption efficiency was observed for this metamaterial *** absorber is polarization insensitive and is stable for incident *** is figured out that the polarization insensitive absorption is caused by the nearly located varied resonant modes which are excited by the E-shaped all-dielectric resonators with the same size but in the different *** E-shaped dielectric absorber contains intensive resonant *** research work paves a way for designing all-dielectric absorber.

关键词： Absorber all-dielectrics E-shaped microwave ceramics

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A transmit/reflect switchable frequency selective surface based on all dielectric metamaterials

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Journal of Advanced Dielectrics 2015年第4期5卷 61-66页

作者： Fei Yu Jun Wang Jiafu Wang Hua Ma hongliang du Xu Zhuo Shaobo Qu Department of Mathematics and Physics College of Science Air Force Engineering University Xi'an 710051P.R.China Electronic Materials Research Laboratory Xi'an Jiaotong University Xi'an 710049P.R.China

In this paper,we propose a novel transmit/reflect switchable frequency selective surface(FSS)in millimeter wave band based on the effective medium theory under quasi-static limit,which is designed with square-hole elements cut from continuum dielectric *** building elements of the surface are composed of all dielectric metamaterial rather than metal *** proper structural design and parameters tuning,the resonance frequencies can be tuned *** frequency response of the surface can be switched from that of a reflecting structure to a transmitting one by rotating the surface 90°,which means under different incident *** reflective response can be realized due to the effect of electric and magnetic *** analysis shows that the reflective response arises from impedance mismatching by electric and magnetic *** the transmitting response is the left-handed passband,arises from the coupling of the electric and magnetic *** addition,effective electromagnetic parameters and the dynamic induced field distributions are analyzed to explain the mechanism of the *** method can also be used to design switchable all-dielectric FSS with continuum structures in other frequencies.

关键词： Switchable FSS dielectric resonance

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