检索结果-南通市图书馆

Flexible nanocomposite electrodes with optimized hybrid structure for improved low-grade heat harvest via thermocells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第6期66卷 1814-1823页

作者： Ziwei Mo Jiaqian zhou Xin Lu Lirong Liang fusheng Liu Zhuoxin Liu Guangming Chen College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065China

Thermal energy is ubiquitous and constantly generated in nature and society.Thermocells(TECs)represent a promising energyconversion technology that can directly translate thermal energy into electricity with a large thermopower,thus having attracted considerable attention in recent years.Nevertheless,the use of noble platinum electrodes in TECs has substantially limited their widespread applications,as the scarcity of platinum element increases the cost of materials,and its intrinsic rigidity is not conducive to flexible and wearable applications under heat sources with complex surface geometry.Herein,we propose a facile hybridizing route to constructing flexible electrodes with optimized nanostructures.The flexible composite electrode is fabricated by decorating a single-walled carbon nanotube network with conducting polypyrrole nanospheres through controlled electrochemical deposition.With refined interfacial nanostructures,the resultant composite film can facilitate carrier transport/transfer at the electrolyte-electrode interface,and thereby shows superior overall thermoelectrochemical performance to noble platinum electrode.The TEC employing the flexible composite electrodes yields a maximum output power of 2.555μW under the temperature difference of 30 K,and a device comprising 6 TEC units is assembled to efficiently utilize waste heat and human body heat,revealing the high potential of low-grade heat harvesting.

关键词： nanocomposites thermocells carbon nanotubes polymers

Defects and failure types of solid insulation in gas‐insulated switchgear:In situ study and case analysis

在线全文

学校读者我要写书评

暂无评论

High Voltage 2022年第1期7卷 158-164页

作者： Yunqi Xing Zhiwen Wang Lin Liu Yuan Xu Yang Yang Shan Liu Fusheng Zhou Shun He Chuanyang Li State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjinChina Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of TechnologyTianjinChina School of Electric Power South China University of TechnologyGuangzhouChina High Voltage Institute China Electric Power Research InstituteBeijingChina Simpson Querrey Institute Northwestern UniversityEvanstonIllinoisUSA HVDC Transmission Technology Department Globe Energy Interconnection Research InstituteBeijingChina Electric Power Research Institute China Southern Power GridGuangzhouChina High Voltage Institute Yunnan Institute of Electrical ScienceYunnanChina Institute of Material Science University of ConnecticutStorrsConnecticutUSA

The gas‐insulated switchgear(GIS)has been widely used in modern ultra‐high voltage systems.However,once it fails,its fully enclosed feature brings challenges in its diagnosis and maintenance.As the failure rate of GIS due to insulator failure has been increasing in recent years,it is necessary and important to understand the commonly existing defects presented in the insulator.First,the manufacturing process of GIS insulators is intro-duced here.The defect types commonly existing in the insulator are categorised.The failure of GIS due to insulator defects that occurred in recent years are reviewed and discussed.The content in this study is useful for engineers and scientists to study on the GIS solid insulation defects and their failure mechanisms.

关键词： (GIS) insulation solid

Enhancing hydrogen storage properties of MgH_(2) using FeCoNiCrMn high entropy alloy catalysts

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 Materials Science & Technology 2023年第18期149卷 88-98页

作者： Haiyi Wan Xiu Yang Shiming zhou Lei Ran Yangfan Lu Yu’an Chen Jingfeng Wang fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Guangdong Guoyan Science and Technology Research Center Co. LtdGuangdong 518000China

Herein,we report the successful preparation of the FeCoNiCrMn high entropy alloy(HEA)loaded MgH_(2) and HEA’s effect on the hydrogen storage properties of Mg/MgH_(2).The HEA shows high catalytic activity toward hydrogen dissociation and recombination reaction,and successfully suppressed activation energy of dehydrogenation reaction from 151.9 to 90.2 kJ mol-1.Moreover,part of Co and Ni can react with Mg,and produce Mg_(2) Co/Mg_(2) CoH 5 and Mg_(2) Ni/Mg_(2) NiH_(4) during the hydrogen storage processes,further en-hancing dehydrogenation reaction through the“hydrogen pumping”mechanism.Asa result,the MgH_(2)-5 wt%HEA composite can release 5.6 wt%of H_(2) at 280℃ within 10 min,and absorb 5.5 wt%H_(2) within 0.5 min at 150℃.The loaded HEA shows robustness against particle aggregation,leading to stable re-versible hydrogen storage processes at least 50 times.These findings show the synergistic effects of HEA on Mg-based hydrogen storage materials,providing an additional degree of freedom for catalyst design.

关键词： Hydrogen storage Magnesium hydride High entropy alloy Catalytic effects

A First-principles Study on the Adhesion Strength,Interfacial Stability,and Electronic Properties of Mg/Mg_(2)Y Interface

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 537-550页

作者： Yunxuan zhou Wenjun Tian Quan Dong Hailian Wang Jun Tan Xianhua Chen Kaihong Zheng fusheng Pan College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China

The interfacial microstructures and configurations directly affect the comprehensive properties of the composites,but their interfacial adhesion mechanism is complicated to expound by experimental methods.In this work,based on the stacking sequence of the Mg/Mg_(2)Y interface models,nine different Mg/Mg_(2)Y interface configurations with top site,bridge site,and hollow site(HCP)under Mg1,Mg_(2),and Y terminations were successfully constructed and systematically explored by first-principles calculations.The results showed that the Mg_(2)Y(0001)surface with Y termination is the most stable when the yttrium chemical potential()is less than-1.09 eV;otherwise,Mg_(2)Y(0001)surface with Mg1 termination is the most stable.The seven-layer Mg(0001)and eleven-layer Mg_(2)Y(0001)slabs are employed to reflect the bulk-like interior properties.Additionally,the Mg(0001)/Mg_(2)Y(0001)with the Y-HCP stacking has the largest interface thermodynamic stability with the value of 2.383 J/m^(2) in all interface configurations owing to its largest work of adhesion.In addition,the interfacial energy of Y-HCP stacking is significantly smaller than those of Mg1-HCP when is approximately less than-0.55 eV,showing that it is more stable.The thermodynamic stability of Mg/Mg_(2)Y with Y-HCP is due to Mg-Y chemical bonds formed between Mg and Y atoms.Lastly,the Mg/Mg_(2)Y interfaces are strong interfaces based on the Griffith fracture theory.

关键词： Mg/Mg_(2)Y interface Interface stability Work of adhesion Electronic structure First-principles calculations

Microstructure and Corrosion Properties of Duplex-Structured Extruded Mg-6Li-4Zn-xMn Alloys

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 867-878页

作者： Minmin Li Zhe Qin Yan Yang Xiaoming Xiong Gang zhou Xiaofei Cui Bin Jiang Xiaodong Peng fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing400044China State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing400044China International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing400044China

The extruded Mg-6 Li-4 Zn-xMn(x=0,0.4,0.8,1.2 wt%)alloys were prepared,and the microstructure of the test alloys was investigated by optical microscopy,scanning electron microscopy and transmission electron microscopy.The corrosion properties were determined by electrochemical measurements and immersion measurements in 3.5%NaCl solution.The results indicate that the extruded Mg-6 Li-4 Zn-xMn alloys are mainly composed ofα-Mg phase,β-Li phase,Mn precipitates and some intermetallic compounds(MgLi_(2)Zn).With the addition of Mn,stable corrosion products were formed on the surface of the test alloy,which can effectively inhibit further corrosion progress and improve the corrosion resistance.Mg-6 Li-4 Zn-1.2 Mn alloy exhibits the best corrosion resistance,attributed to grain refinement,the improvement of the stability of corrosion product film and uniform distribution of fine second phases.

关键词： Mg-Li alloys Microstructure Extruded Corrosion resistance property

Interfacial Reaction of Ti6Al4V Lattice Structure-Reinforced VW92 Alloy Matrix Composites

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 570-576页

作者： Haijun Wang Renju Cheng Xianhua Chen Mingbo Yang Daiyi Deng Lirui Liu Yongfeng zhou Yanlong Ma Kaihong Zheng fusheng Pan College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China

A novel melting infiltration by ultrasonic vibration was investigated and applied to fabricate Ti6Al4V(TC4)lattice structure-reinforced Mg-10Gd-2Y-1Zn-xZr(refer to VW92 hereafter,x=0,0.5 wt%)alloy matrix composites.The edge-to-edge matching model indicates that the well-matching and possible orientation relationships(ORs)between theα-Mg andα-Ti,[10-10]_(α-Mg)//[11-23]_(α-Ti) in(0002)_(α-Mg)//(10-10)_(α-Ti) possesses the smallest misfit of 0.4%(f_(r)),and thus theα-Mg grains can nucleate on the TC4 lattice structure.Interfacial reaction occurred in the TC4/VW92+0.5 wt%Zr composites,and the reaction product was confirmed to be Al_(2)Zr_(3),AlZr_(2) andα-Ti(Zr)particles formed by continuous solution of Zr-Ti.Among the interfacial products,the AlZr_(2) phase is a brittle phase with high-volume fraction,which is not conducive to the load transfer.But generally speaking,theα-Ti(Zr)and theα-Mg tend to form a coherent interface,which is beneficial for improving the interfacial bonding strength of composites.

关键词： TC4 VW92 composites TC4 lattice structure Interfacial reaction Mismatch

Understanding the superior mechanical properties of Mg-3Al-Zn alloy sheets:Role of multi-type unique textures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1104-1112页

作者： Jun Xu Jun Zhao Bin Jiang Wenjun Liu Hong Yang Xintao Li Yuehua Kang Nan zhou Kaihong Zheng fusheng Pan Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China School of Mechanical and Electrical Engineering Hunan City UniversityYiyang 413002China National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Chongqing Institute for Advanced Light Metals Chongqing 400030China College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China

Mg-3Al-1Zn(AZ31)sheets were produced by transverse gradient extrusion(TGE)process.The flow behavior and dynamic recrystallization during extrusion were systematically analyzed.The microstructures,textures,and mechanical behavior of extruded AZ31 sheet were also analyzed and compared with conventional extruded(CE)sheet.The results showed that fine grain structure and multi-type unique textures were formed in TGE sheet because of the generation of extra flow velocity along transverse direction(TD)and flow velocity gradient along extrusion direction(ED)during extrusion.The basal poles gradually deviated away normal direction(ND)from edge to center of the TGE sheet along TD,and the largest inclination angle at center region reached around 65°.Furthermore,the basal poles inclined from ED to TD 40°-63°,except for the center region of TGE sheet.The TGE sheet presented higher ductility and strain hardening exponent(n-value),but lower yield strength and Lankford value(r-value)in comparison with the CE sheet.Both the basalslip and tensile twins were easy to be activated during deformation,and the largest elongation of 41%and the lowest yield strength of 86.5 MPa were obtained for the ED-center sample in the TGE sheet.

关键词： transverse gradient extrusion multi-type unique textures mechanical properties

3D Geological Modeling of the Xiangshan Uraniferous Volcanic, Jiangxi Province

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2020年第4期94卷 1319-1320页

作者： GUO fusheng LI Guangrong WU Zhichun YANG Haiyan LIN Ziyu zhou Wanpeng State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China

Objective Three-dimensional(3D)subsurface geological models have been gaining considerable attention wordwide.3D geological surveys and modelling in the Xiangshan uraniferous volcanic basin,Le’an county,Jiangxi Province is a pilot project of the China Geological Survey.The Xiangshan volcanic basin is the third largest volcanic-type uranium ore field worldwide.This basin is composed of Lower Cretaceous rhyodacite and porphyritic lava with shattered phenocrysts,as well as small amounts of high-level intrusive acidic rocks,overlying a basement of metamorphic rocks.More than 60 years of exploration and mining activities have revealed the most important geological characteristics and factors controlling the uranium mineralization。

关键词： Jiangxi Geological Cretaceous

DNA methylation-based subclassification of psoriasis in the Chinese Han population

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2018年第6期12卷 717-725页

作者： Fusheng Zhou Changbing Shen Yi-Hsiang Hsu Jing Gao Jinfa Dou Randy KO Xiaodong Zheng Liangdan Sun Yong Cui Xuejun Zhang Institute of Dermatology The First Affiliated HospitalAnhui Medical UniversityHefei 230032China Department of Dermatology The Second Affiliated HospitalAnhui Medical UniversityHefei 230601China Department of Biochemistry University of New MexicoAlbuquerqueNM 87131USA The Key Laboratory of Dermatology (Anhui Medical University) Ministry of EducationHefei 230032China Collaborative Innovation Center for Complex and Severe Dermatosis Anhui Medical UniversityHefei 230032China Department of Dermatology China-Japan Friendship HospitalBeijing 100029China Graduate School Peking Union Medical College and Chinese Academy of Medical SciencesBeijing 100730China Department of Dermatology The First Affiliated HospitalAnkui Medical UniversityHefei 230032China Molecular and Integrative Physiological Sciences Harvard T.H.CHAN School of PubIic HealthBostonMA 02115USA Hebrew SeniorLife Institute for Aging Research and Harvard Medical School BostonMA 02131USA Broad Institute of MIT and Harvard CambridgeMA 02142USA

Psoriasis (Ps) is an inflammatory skin disease caused by genetic and environmental factors. Previous studies on DNA methylation (DNAm) found genetic markers that are closely associated with Ps, and evidence has shown that DNAm mediates genetic risk in Ps. In this study, Consensus Clustering was used to analyze DNAm data, and 114 Ps patients were divided into three subclassifications. Investigation of the clinical characteristics and copy number variations (CNVs) of DEFB4, IL22, and LCE3C in the three subclassifications revealed no significant differences in gender ratio and in Ps area and severity index (PASI) score. The proportion of late-onset ( ≥ 40 years) Ps patients was significantly higher in type I than in types II and III (P = 0.035). Type III contained the smallest proportion of smokers and the largest proportion of non-smoking Ps patients (P = 0.086). The CNVs of DEFB4 and LCE3C showed no significant differences but the CNV of IL22 significantly differed among the three subclassifications (P = 0.044). This study is the first to profile Ps subclassifications based on DNAm data in the Chinese Han population. These results are useful in the treatment and management of Ps from the molecular and genetic perspectives.

关键词： DNA methylation psoriasis subclassification