检索结果-南通市图书馆

Remarkably enhanced dielectric stability and energy storage properties in BNT–BST relaxor ceramics by A-site defect engineering for pulsed power applications

引用

Journal of Advanced Ceramics 2022年第2期11卷 283-294页

作者： Zhipeng LI Dong-Xu LI zong-yang shen Xiaojun ZENG Fusheng SONG Wenqin LUO Xingcai WANG Zhumei WANG Yueming LI Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Chengdu Hongke Electronic Technology Co. Ltd.Chengdu 610000China

Lead-free bulk ceramics for advanced pulsed power capacitors show relatively low recoverable energy storage density(Wrec)especially at low electric field condition.To address this challenge,we propose an A-site defect engineering to optimize the electric polarization behavior by disrupting the orderly arrangement of A-site ions,in which Ba_(0.105)Na_(0.325)Sr_(0.245−1.5x)□_(0.5x)Bi_(0.325)+xTiO_(3)(BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T,x=0,0.02,0.04,0.06,and 0.08)lead-free ceramics are selected as the representative.The BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T ceramics are prepared by using pressureless solid-state sintering and achieve large W_(rec)(1.8 J/cm^(3))at a low electric field(@110 kV/cm)when x=0.06.The value of 1.8 J/cm3 is super high as compared to all other W_(rec) in lead-free bulk ceramics under a relatively low electric field(<160 kV/cm).Furthermore,a high dielectric constant of 2930 within 15%fluctuation in a wide temperature range of 40–350℃is also obtained in BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T(x=0.06)ceramics.The excellent performances can be attributed to the A-site defect engineering,which can reduce remnant polarization(P_(r))and improve the thermal evolution of polar nanoregions(PNRs).This work confirms that the BNS_(0.245−1.5x)□_(0.5x)B_(0.325+x)T(x=0.06)ceramics are desirable for advanced pulsed power capacitors,and will push the development of a series of Bi0.5Na0.5TiO3(BNT)-based ceramics with high W_(rec) and high-temperature stability.

关键词： relaxor ferroelectrics energy storage ceramics ceramic capacitor Bi_(0.5)Na_(0.5)TiO_(3)(BNT) defect engine

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

BS_(0.5)BNT-based relaxor ferroelectric ceramic/glass-ceramic composites for energy storage

引用

Journal of Advanced Ceramics 2023年第4期12卷 695-710页

作者： Xuhai Shi Kai Li zong-yang shen Junqi Liu Chaoqun Chen Xiaojun Zeng Bo Zhang Fusheng Song Wenqin Luo Zhumei Wang Yueming Li China National Light Industry Key Laboratory of Functional Ceramic Materials Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi ProvinceAdvanced Ceramic Materials Research InstituteSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China

Relaxor ferroelectric ceramics have very high dielectric constant(e)but relatively low electrical breakdown strength(Eb),while glass-ceramics exhibit higher E,due to the more uniformly dispersed amorphous phases and submicrocrystals/nanocrystals inside.How to effectively combine the advantages of both relaxor ferroelectric ceramics and glass-ceramics is of great significance for the development of new dielectric materials with high energy storage performance.In this work,we firstly prepared BaO-SrO-Bi_(2)O_(3)-Na_(2)0-TiO_(2)-Al_(2)O_(3)-SiO_(2)(abbreviated as GS)glass powders,and then fabricated(Ba_(0.3)Sr_(0.7))_(0.5)(Bi_(0.5)Na_(0.5))_(0.5)TiO_(3)+x wt%GS ceramic composites(abbreviated as BSo.sBNT-xGS,x=0,2,6,10,14,16,and 18).Submicrocrystals/nanocrystals with a similar composition to BSo.sBNT were crystalized from the glass,ensuring the formation of uniform core-shell structure in BSo.sBNT-xGS relaxor ferroelectric ceramic/glass-ceramic composites.When the addition amount of GS was 14 wt%,the composite possessed both high&r(>3200 at 1 kHz)and high E,(~170 kV/cm)at room temperature,and their recoverable energy storage density and efficiency were Wrec=2.1 J/cm’and n=65.2%,respectively.The BSo.sBNT-14GS composite also had several attractive properties such as good temperature,frequency,cycle stability,and fast charge-discharge speed.This work provides insights into the relaxor ceramic/glass-ceramic composites for pulsed power capacitors and sheds light on the utilization of the hybrid systems.

关键词： relaxor ferroelectrics energy storage ceramics glass-ceramics Bi_(0.5)Na_(0.5)TiO_(3)(BNT) Ba_(0.3)Sr_(0.7)TiO_(3)(BST)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress and challenges of ceramics for supercapacitors

引用

Journal of Materiomics 2021年第6期7卷 1198-1224页

作者： Xiaojun Zeng Hanbin Song zong-yang shen Martin Moskovits School of Materials Science and Engineering Jingdezhen Ceramic InstituteJingdezhen333403China Department of Chemistry and Biochemistry University of California Santa BarbaraSanta BarbaraCA93106United States

Supercapacitors(SCs)are one of the most promising electrical energy storage technologies systems due to their fast storage capability,long cycle stability,high power density,and environmental friendliness.Enormous research has focused on the design of nanomaterials to achieve low cost,highly efficient,and stable electrodes.Ceramic materials provide promising candidates for SCs electrodes.However,the low specific surface area and relatively low surface activity severely hinder the SCs performance of ceramic materials.Therefore,the basic understanding of ceramic materials,the optimization strategy,and the research progress of ceramic electrodes are the key steps to enable good electrical conductivity and excellent electron transport capabilities,and realize economically feasible ceramic electrodes in industry.Herein,we review recent achievements in manufacturing the ceramic electrodes for SCs,including metal oxide ceramics,multi-elemental oxide ceramics,metal hydroxide ceramics,metal sulfide ceramics,carbon-based ceramics,carbide and nitride ceramics,and other special ceramics(MXene).We focus on the unique and key factors in the component and structural design of ceramic electrodes,which correlate them with SCs performance.In addition,the current technical challenges and perspectives of ceramic electrodes for SCs are also discussed.

关键词： Ceramic electrodes Component design Structure design Specific capacitance Supercapacitors

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

P-E hysteresis loop going slim in Ba0.3Sr0.7TiO3-modified Bi0.5Na0.5TiO3 ceramics for energy storage applications

引用

Journal of Advanced Ceramics 2020年第2期9卷 183-192页

作者： Dongxu LI zong-yang shen Zhipeng LI Wenqin LUO Xingcai WANG Zhumei WANG Fusheng SONG Yueming LI Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic InstituteJingdezhen333000China Chengdu Hongke Electronic Technology Co. Ltd.Chengdu610000China

(Ba0.3Sr0.7)x(Bi0.5Na0.5)1-xTiO3(BSxBNT,x=0.3–V0.8)ceramics were prepared to investigate their structure,dielectric and ferroelectric properties.BSxBNT ceramics possess pure perovskite structure accompanied from a tetragonal symmetry to pseudo-cubic one with the increase of x value,being confirmed by X-ray diffraction(XRD)and Raman results.The Tm corresponding to a temperature in the vicinity of maximum dielectric constant gradually decreases from 110℃(x=0.3)to-45℃(x=0.8),across Tm=36℃(x=0.5)with a maximum dielectric constant(ɛr=5920@1 kHz)around room temperature.The saturated polarization Ps gradually while the remnant polarization Pr sharply decreases with the increase of x value,making the P-E hysteresis loop of BSxBNT ceramics goes slim.A maximum difference between Ps and Pr(Ps-Pr)is obtained for BSxBNT ceramics with x=0.5,at which a high recoverable energy density(Wrec=1.04 J/cm3)is achieved under an applied electric field of 100 kV/cm with an efficiency ofη=77%.Meanwhile,the varied temperature P-E loops,fatigue measurements,and electric breakdown characteristics for the sample with x=0.5 indicate that it is promising for pulsed power energy storage capacitor candidate materials.

关键词： energy storage ceramics Ba0.3Sr0.7TiO3(BST) Bi0.5Na0.5TiO3(BNT) relaxor ferroelectrics pulsed power capacitor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Progress and perspectives in dielectric energy storage ceramics

引用

Journal of Advanced Ceramics 2021年第4期10卷 675-703页

作者： Dongxu LI Xiaojun ZENG Zhipeng LI zong-yang shen Hua HAO Wenqin LUO Xingcai WANG Fusheng SONG Zhumei WANG Yueming LI Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Chengdu Hongke Electronic Technology Co. Ltd.Chengdu 610000China

Dielectric ceramic capacitors,with the advantages of high power density,fast chargedischarge capability,excellent fatigue endurance,and good high temperature stability,have been acknowledged to be promising candidates for solid-state pulse power systems.This review investigates the energy storage performances of linear dielectric,relaxor ferroelectric,and antiferroelectric from the viewpoint of chemical modification,macro/microstructural design,and electrical property optimization.Research progress of ceramic bulks and films for Pb-based and/or Pb-free systems is summarized.Finally,we propose the perspectives on the development of energy storage ceramics for pulse power capacitors in the future.

关键词： energy storage ceramics dielectric relaxor ferroelectric antiferroelectric pulse power capacitor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ce and W co-doped CaBi_(2)Nb_(2)O_(9) with enhanced piezoelectric constant and electrical resistivity at high temperature

引用

Journal of Materiomics 2020年第3期6卷 459-466页

作者： zong-yang shen Chen Qin Wen-Qin Luo Fusheng Song Zhumei Wang Yueming Li Shujun Zhang Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic InstituteJingdezhen333403China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2500Australia

Ce and W co-doped CaBi_(2)Nb_(2)O_(9) ceramics with chemical formula Ca_(0.96)Ce_(0.04)Bi_(2)Nb_(2-x)W_(x)O_(9)(CCBNW100x,x=0-0.07)are fabricated via conventional solid state sintering method,to investigate the effect of W addition on the structure,electrical resistivity,dielectric and piezoelectric properties.A piezoelectric constant d33 of 13.4 pC/N is obtained in CCBN-W2 ceramics,>100% higher than that of pure CaBi_(2)Nb_(2)O_(9)(d_(33)=5.8e6.4 pC/N).Of particular significance is that the electrical resistivity of CCBN-W2 ceramics(r=3.7×109 U cm at 500℃)is three orders of magnitude higher than pure CaBi_(2)Nb_(2)O_(9)(r=2.9×10^(6) U cm at same temperature).All these properties,together with its low dielectric loss(tandδ0.13%)and excellent d33 thermal stability up to 800℃,merit the CCBN-W2 ceramics for high temperature piezoelectric sensing applications.

关键词： Ultra-high temperature ceramics Piezoelectric properties Aurivillius phase Bismuth layered structure CaBi_(2)Nb_(2)O_(9)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Glass modified barium strontium titanate ceramics for energy storage capacitor at elevated temperatures

引用

Journal of Materiomics 2019年第4期5卷 641-648页

作者： zong-yang shen Yu Wang Yanxue Tang Yuanying Yu Wen-Qin Luo Xingcai Wang Yueming Li Zhumei Wang Fusheng Song Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic InstituteJingdezhen333403China Key Laboratory of Optoelectronic Material and Device Shanghai Normal UniversityShanghai200234China Chengdu Hongming UESTC Electronic New Materials Co. Ltd.Chengdu610100China

A glass with composition of B_(2)O_(3)-Bi_(2)O_(3)-SiO_(2)-CaO-BaO-Al_(2)O_(3)-ZrO_(2)(BBSZ)modified Ba_(x)Sr_(1-x)TiO_(3)(BST,x=0.3 and 0.4)ceramics were prepared by a conventional solid state reaction method abided by a formula of BST+y%BBSZ(y=0,2,4,7,and 10,in mass).The effect of BBSZ glass content on the structure,dielectric properties and energy storage characteristics of the ceramics was investigated.The dielectric constant reduced but the endurable electrical strength enhanced due to the BBSZ glass addition in BST ceramics.In particular,the dielectric loss of the ceramics at elevated temperature(e.g.200℃)can be strongly suppressed from tanδ>20%to tanδ<3% after BBSZ glass modification.For Ba_(0.3)Sr_(0.7)TiO_(3)+2%BBSZ ceramics,an optimized energy storage density(γ=0.63 J/cm^(3))and efficiency(η=91.6%)under an applied electric field of 160 kV/cm was obtained at room temperature.Meanwhile,the temperature dependent polarization-electric field(P-E)hysteresis loops were measured to evaluate the energy storage characteristics of the ceramics potential for high voltage capacitor application at elevated temperatures.

关键词： Barium strontium titanate Glass modification Energy storage Ceramic capacitor

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structure and dielectric properties of NBT-xBT-ST lead-free ceramics for energy storage

引用

Journal of Advanced Dielectrics 2018年第6期8卷 3-7页

作者： Wen-Qin Luo zong-yang shen Yuan-Ying Yu Fu-sheng Song Zhu-Mei Wang Yue-Ming Li Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province China National Light Industry Key Laboratory of Functional Ceramic Materials School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333403P.R.China

(0:74-x)(Na_(0.5)Bi_(0.5))TiO_(3)-xBaTiO_(3)-0.26SrTiO_(3)(x=0~0.1)(abbreviated as NBT-xBT-ST)lead-free ceramics were fabricated by a solid-state reaction method.The effect of Ba doping amount x on the structure and energy storage properties of NBT-xBT-ST ceramics were investigated.All the NBT-xBT-ST ceramics showed single perovskite structure with a pseudocubic phase.Ba doping effectively suppressed grain growth,in favor of forming small and uniform grains.The ceramics with a composition of x=0.04,an optimized energy storage density(γ=0.47 J/cm^(3))and efficiency(η=48:67%),under an applied electric field of 50 kV/cm,should be a candidate for solid-state compact pulsed power capacitor materials.

关键词： Sodium bismuth titanate barium strontium titanate energy storage ceramics compact pulsed power

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A scoping review of methodologies for applying artificial intelligence to physical activity interventions

引用

Journal of Sport and Health Science 2024年第3期13卷 428-441页

作者： Ruopeng An Jing shen Junjie Wang Yuyi yang Brown School Washington UniversitySt.LouisMO 63130USA Department of Physical Education China University of Geosciences BeijingBeijing 100083China School of Kinesiology and Health Promotion Dalian University of TechnologyDalian 116024China Division of Computational and Data Sciences Washington UniversitySt.LouisMO 63130USA

Purpose This scoping review aimed to offer researchers and practitioners an understanding of artificial intelligence(AI)applications in physical activity(PA)interventions;introduce them to prevalent machine learning(ML),deep learning(DL),and reinforcement learning(RL)algorithms;and encourage the adoption of AI methodologies.Methods A scoping review was performed in PubMed,Web of Science,Cochrane Library,and EBSCO focusing on AI applications for promoting PA or predicting related behavioral or health outcomes.AI methodologies were summarized and categorized to identify synergies,patterns,and trends informing future research.Additionally,a concise primer on predominant AI methodologies within the realm of PA was provided to bolster understanding and broader application.Results The review included 24 studies that met the predetermined eligibility criteria.AI models were found effective in detecting significant patterns of PA behavior and associations between specific factors and intervention outcomes.Most studies comparing AI models to traditional statistical approaches reported higher prediction accuracy for AI models on test data.Comparisons of different AI models yielded mixed results,likely due to model performance being highly dependent on the dataset and task.An increasing trend of adopting state-of-the-art DL and RL models over standard ML was observed,addressing complex human–machine communication,behavior modification,and decision-making tasks.Six key areas for future AI adoption in PA interventions emerged:personalized PA interventions,real-time monitoring and adaptation,integration of multimodal data sources,evaluation of intervention effectiveness,expanding access to PA interventions,and predicting and preventing injuries.Conclusion The scoping review highlights the potential of AI methodologies for advancing PA interventions.As the field progresses,staying informed and exploring emerging AI-driven strategies is essential for achieving significant improvements in PA interventions and fostering overall we

关键词： Artificial intelligence Intervention Machine learning Neural network Physical activity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effectiveness and tolerability of programmed cell death protein-1 inhibitor+chemotherapy compared to chemotherapy for upper gastrointestinal tract cancers

引用

World Journal of Gastrointestinal Oncology 2024年第4期16卷 1613-1625页

作者： Xiao-Min Zhang Ting yang Ying-Ying Xu Bao-Zhong Li Wei shen Wen-Qing Hu Cai-Wen Yan Liang zong Department of Central Laboratory Changzhi People’s HospitalThe Affiliated Hospital of Changzhi Medical CollegeChangzhi 046000Shanxi ProvinceChina Department of Gastrointestinal Surgery Yizheng People’s HospitalThe Affiliated Hospital of Yangzhou UniversityYangzhou 225000Jiangsu ProvinceChina Department of General Surgery Anyang Tumor HospitalAnyang 455000Henan ProvinceChina Department of General Surgery Wuxi People’s Hospital Affiliated to Nanjing Medical UniversityWuxi 214023Jiangsu ProvinceChina Department of Gastrointestinal Surgery Changzhi People’s HospitalThe Affiliated Hospital of Changzhi Medical CollegeChangzhi 046000Shanxi ProvinceChina Department of Gastroenterology Changzhi People’s HospitalThe Affiliated Hospital of Changzhi Medical CollegeChangzhi 046000Shanxi ProvinceChina

BACKGROUND The combination of programmed cell death protein-1(PD-1)inhibitor and che-motherapy is approved as a standard first-or second-line treatment in patients with advanced oesophageal or gastric cancer.However,it is unclear whether this combination is superior to chemotherapy alone.AIM To assess the comparative effectiveness and tolerability of combining PD-1 inhibitors with chemotherapy vs chemotherapy alone in patients with advanced gastric cancer,gastroesophageal junction(GEJ)cancer,or oesophageal carcinoma.METHODS We searched the PubMed and Embase databases for studies that compared the efficacy and tolerance of PD-1 inhibitors in combination with chemotherapy vs chemotherapy alone in patients with advanced oesophageal or gastric cancer.We employed either random or fixed models to analyze the outcomes of each clinical trial,en-compassing data on overall survival(OS),progression-free survival(PFS),objective response rate,and adverse events(AEs).RESULTS Nine phase 3 clinical trials(7016 advanced oesophageal and gastric cancer patients)met the inclusion criteria.Our meta-analysis demonstrated that the pooled PD-1 inhibitor+chemotherapy group had a significantly longer OS than the chemotherapy-alone group[hazard ratio(HR)=0.76,95%confidence interval(CI):0.71-0.81];the pooled PFS result was consistent with that of OS(HR=0.67,95%CI:0.61-0.74).The count of patients achieving an objective response in the PD-1 inhibitor+chemotherapy group surpassed that of the chemotherapy-alone group[odds ratio(OR)=1.86,95%CI:1.59-2.18].AE incidence was also higher in the combination-therapy group than in the chemotherapy-alone group,regardless of whether≥grade 3 only(OR=1.30,95%CI:1.07-1.57)or all AE grades(OR=1.88,95%CI:1.39-2.54)were examined.We performed a subgroup analysis based on the programmed death-ligand 1(PD-L1)combined positive score(CPS)and noted extended OS and PFS durations within the CPS≥1,CPS≥5,and CPS≥10 subgroups of the PD-1 inhibitor+chemotherapy group.CONCLUSION In contrast to chemotherapy alone,the combina

关键词： Programmed cell death protein-1 inhibitor Chemotherapy Oesophageal squamous cell carcinoma Gastric/gastroesophageal junction adenocarcinoma Overall survival Progression-free survival Objective response rate Adverse event

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：