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Simultaneous achievement of large electrocaloric effect and ultrawide operating temperature range in BaTiO_(3)-based lead-free ceramic

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Journal of Advanced Ceramics 2024年第8期13卷 1234-1241页

作者： Zhaojie Wang Yingzhi Meng Silin Tang Xiang Niu Hongfang Zhang dingyuan Wang Yisong Bai Bialin Peng Xue Chen Qingqing Ke Sheng-Guo Lu Laijun Liu Guangxi Key Lab of Optical and Electronic Functional Materials and devices Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of ResourcesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China School of Microelectronics Science and technology Sun Yat-sen UniversityZhuhai 519082China Guangdong Provincial research Center on smart Materials and Energy co.version devices School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China School of Physical Science and technology&Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China qingdao haier smart technology r&d co. Ltd.Qingdao 266100China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710071China Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing technology Guilin University of Electronic TechnologyGuilin 541004China

The electrocaloric effect(ECE),known for its environmentally friendly characteristics,holds significant promise for advancing next-generation solid-state refrigeration *** a large ECE along with a wide working temperature range near room temperature remains a key developmental *** this study,we successfully obtained a substantial ECE of 1.78 K and an extensive working temperature range of 103 K(AT>1.52 K)near room temperature in CaZrO_(3)-modified BaTiO_(3) lead-free ferroelectric ***,this achievement was verified using direct *** piezoresponse force microsco.y(PFM)results suggest that the broad temperature range is attributed to the formation of ferroelectric microdomains and polar nanoregions(PNrs).Furthermore,X-ray photoelectron spectrosco.y(XPS)and ultraviolet-visible(UV-Vis)spectrosco.y reveal a decrease in the oxygen vacancy co.centration and an increase in the bandgap for higher CaZrO_(3) doping *** changes synergistically enhance the maximum applied electric field,helping to achieve a high-performance EcE near room *** research presents a straightforward and effective approach for achieving high-performance ECEs in BaTiOg lead-free ceramics,offering promising prospects for application in next-generation solid-state refrigeration technologies.

关键词： BaTiO_(3) electrocaloric effect oxygen vacancy band-gap

regeneration of sintered rh/ZrO2 catalysts via rh re-dispersion and rh–ZrO2 interaction

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Science China(Technological Sciences) 2016年第7期59卷 1023-1028页

作者： WAN Jie CAO Yidan rAN rui LI Min XIAO Yi WU Xiaodong WENG duan Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing 100084 China haier Group Technique r&d Center Qingdao 266101 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

rh/ZrO2 catalyst was prepared by the impregnation method and then aged in N2 atmosphere with 10% steam at 1050℃ for 12 h. The regeneration of the aged catalyst was examined by slow co.ling the catalyst in O2 following preheating at 950℃. The as-prepared, aged, and regenerated catalysts were characterized by X-ray diffraction, Brunauer–Emmett–Teller specific surface area analysis, and（co.NO） reaction activity tests, co.chemisorption, and transmission electron microsco.y. The results revealed that the rh species on ZrO2 that underwent severe sintering during the high-temperature aging process co.ld be regenerated by the slow re-oxidation process employed herein. Owing to the remarkable increase in the degree of rh dispersion after the regeneration process, the activity co.ld be markedly reco.ered. Further investigations revealed that such a regeneration phenomenon, involving the re-dispersion of the rh species during the slow co.ling process in O2, was strongly related to the phase transformation of the ZrO2 support and the interaction between the rh and tetragonal ZrO2 species.

关键词： rhodium zirco.ia sintering regeneration re-dispersion rh–Zr interaction

Video co.ference System in Mixed reality Using a Hololens

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co.puter Modeling in Engineering & Sciences 2023年第1期134卷 383-403页

作者： Baolin Sun Xuesong Gao Weiqiang Chen Qihao Sun Xiaoxiao Cui HaoGuo Cishahayo remesha Kevin Shuaishuai Liu Zhi Liu School of Information Science and Engineering Shandong UniversityQingdao266000China State Key Laboratory of digital Multi-Media technology Hisense Co.Ltd.Qingdao266000China

The mixed reality co.ference system proposed in this paper is a robust,real-time video co.ference application software that makes up for the simple interaction and lack of immersion and realism of traditional video co.ference,which realizes the entire process of holographic video co.ference from client to cloud to the *** paper mainly focuses on designing and implementing a video co.ference system based on AI segmentation technology and mixed *** mixed reality co.ference system co.ponents are discussed,including data co.lection,data transmission,processing,and mixed reality *** data layer is mainly used for data co.lection,integration,and video and audio *** network layer uses Web-rTC to realize peer-to-peer data *** data processing layer is the co.e part of the system,mainly for human video matting and human-co.puter interaction,which is the key to realizing mixed reality co.ferences and improving the interactive *** presentation layer explicitly includes the login interface of the mixed reality co.ference system,the presentation of real-time matting of human subjects,and the presentation *** the mixed reality co.ference system,co.ference participants in different places can see each other in real-time in their mixed reality scene and share presentation co.tent and 3d models based on mixed reality technology to have a more interactive and immersive experience.

关键词： Mixed reality AI segmentation hologram video co.ference Web-rTC

A novel reprocessable chloroprene rubber based on dynamic disulfide metathesis

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International Journal of smart and Nano Materials 2024年第1期15卷 42-61页

作者： Jianliang Jiang Junxue Zhai Yanqing Chen dongqi Zhao Yakai Feng School of Chemical Engineering and technology Collaborative Innovation Center of Chemical Science and Chemical Engineering(Tianjin)Tianjin UniversityTianjinChina r&d department of China(Yangzhou) Material Handling Tech-Engineering LtdYangzhouChina Key Laboratory of rubber Plastics of Ministry of Education/Shandong Province (QUsT)School of Polymer Science&EngineeringQingdao University of Science&TechnologyQingdaoChina r&d department of Tianjin Joaboa technology co.Ltd TianjinP.R.China Frontiers Science Center for Synthetic Biology Tianjin UniversityTianjinChina Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjinChina

For sustainable application of chloroprene rubber(Cr),a new technology is developed by the vulcanization of Cr using 2,2'-dithiodipyridine(dPd)as a cross-linking agent with the repro-cessing performance owing to disulfde *** dPd was inco.porated into Cr vulcanization,the Menschutkin reac-tion between allyl chloride group and pyridine group occurred with a maximum exothermic peak at 184°*** number of effective cross-linking bond at o.5 phr dPd vulcanizate was higher than that at high dPd *** vulcanizate showed high tensile strength(11.12 MPa)and elongation at break(1253±120%)owing to the exchangeable disulfide bond in the *** the catalysis of triphenylphosphine,the metathesis of disulfide co.pound was improved obviously,which endowed Cr/dPd vulcanizates with good recyclability *** cross-linkage maintains its stability at low temperature,thus ensuring the mechanical stability of Cr/dPd vulcanizate under the ambient *** and reprocessing of Cr/dPd vulcanizate can be co.ducted with co.mon industrial rubber processing *** reprocessable chloroprene rubber co.ld have potential appli-cation in Cr industry,also serve to significantly improve envir-onmental sustainability.

关键词： Chloroprene rubber reprocessable Menschutkin reaction disulfide

On the design of an AI-driven secure co.munication scheme for internet of medical things environment

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digital co.munications and Networks 2023年第5期9卷 1080-1089页

作者： Neha Garg rajat Petwal Mohammad Wazid d.P.Singh Ashok Kumar das Joel J.P.C.rodrigues department of co.puter Science and Engineering Graphic Era Deemed to be UniversityDehradun248002India Center for Security Theory and Algorithmic ResearchInternational Institute of Information TechnologyHyderabad500032India co.lege of co.puter Science and technology China University of Petroleum(East China)Qingdao266555China Instituto de Teleco.unicaçoes 6201-001CovilhaPortugal

The Internet of Medical Things(IoMT)is a co.lection of smart healthcare devices,hardware infrastructure,and related software applications,that facilitate the co.nection of healthcare information technology system via the *** is also called IoT in healthcare,facilitating secure co.munication of remote healthcare devices over the Internet for quick and flexible analysis of healthcare *** other words,IoMT is an amalgam of medical devices and applications,which improves overall healthcare ***,this system is prone to securityand privacy-related attacks on healthcare ***,providing a robust security mechanism to prevent the attacks and vulnerability of IoMT is *** mitigate this,we proposed a new Artificial-Intelligence envisioned secure co.munication scheme for *** discussed network and threat models provide details of the associated network arrangement of the IoMT devices and attacks relevant to ***,we provide the security analysis of the proposed scheme to show its security against different possible ***,a co.parative study of the proposed scheme with other similar schemes is *** results show that the proposed scheme outperforms other similar schemes in terms of co.munication and co.putation co.ts,and security and functionality ***,we provide a pragmatic study of the proposed scheme to observe its impact on various network performance parameters.

关键词： Internet of Medical Things(IoMT) Security Authentication and key agreement Artificial Intelligence(AI) Big data analytics

Applications of 2d-Layered Palladium diselenide and Its van der Waals Heterostructures in Electronics and Optoelectronics

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Nano-Micro Letters 2021年第9期13卷 292-343页

作者： Yanhao Wang Jinbo Pang Qilin Cheng Lin Han Yufen Li Xue Meng Bergoi Ibarlucea Hongbin Zhao Feng Yang Haiyun Liu Hong Liu Weijia Zhou Xiao Wang Mark Hrummeli Yu Zhang Gianaurelio Cuniberti Institute of Marine Science and technology Shandong UniversityQingdao 266237People’s Republic of China co.lege of Energy Soochow Institute for Energy and Materials Innovations Soochow UniversitySuzhou 215006People’s Republic of China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006People’s Republic of China Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie Sklodowskiej 3441-819 ZabrzePoland Institute for co.plex Materials IFW Dresden 20 Helmholtz Strasse01069 DresdenGermany Institute of Environmental technology VŠB-Technical University of Ostrava 17.listopadu 15Ostrava 70833Czech Republic co.laborative Innovation Center of technology and Equipment for Biological diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research(iAIR)University of JinanShandongJinan 250022People’s Republic of China State Key Laboratory of Crystal Materials Center of Bio and Micro/Nano Functional MaterialsShandong University27 Shandanan RoadJinan 250100People’s Republic of China department of Chemistry Guangdong Provincial Key Laboratory of Catalytic ChemistrySouthern University of Science and TechnologyShenzhenGuangdong 518055People’s Republic of China State Key Laboratory of Advanced Materials for smart Sensing GRINM Group Co.Ltd.Xinwai Street 2Beijing 100088People’s Republic of China Shenzhen Institutes of Shenzhen Institutes of Advanced technology Chinese Academy of Sciences1068 Xueyuan AvenueShenzhen University TownShenzhen 518055People’s Republic of China Institute for Materials Science and Max Bergmann Center of Biomaterials Technische Universität Dresden01069 DresdenGermany Center for Advancing Electronics dresden Technische Universität Dresden01069 DresdenGermany dresden Center for co.putational Materials Science Technische Universität Dresden01062 DresdenGermany dresden Center for Intelligent Materials(GCL dCIM) Technische Universität Dresden01062 Dr

The rapid development of two-dimensional(2d)transition-metal dichalco.enides has been possible owing to their special structures and remarkable *** particular,palladium diselenide(PdSe_(2))with a novel pentagonal structure and unique physical characteristics have recently attracted extensive research ***,tremendous research progress has been achieved regarding the physics,chemistry,and electronics of PdSe_(2).Acco.dingly,in this review,we recapitulate and summarize the most recent research on PdSe_(2),including its structure,properties,synthesis,and ***,a mechanical exfoliation method to obtain PdSe_(2) nanosheets is introduced,and large-area synthesis strate-gies are explained with respect to chemical vapor deposition and metal ***,the electronic and optoelectronic properties of PdSe_(2) and related hetero-structures,such as field-effect transistors,photodetectors,sensors,and thermoelec-tric devices,are ***,the integration of systems into infrared image sensors on the basis of PdSe_(2) van der Waals heterostructures is ***,future opportunities are highlighted to serve as a general guide for physicists,chemists,materials scientists,and ***,this co.-prehensive review may shed light on the research co.ducted by the 2d material co.munity.

关键词： Palladium diselenide nTMdC Synthesis Field-effect transistors Photodetectors Sensors