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Recent progresses in thermal.treatment of β-Ga_(2)O_(3) singl. crystal. and devices

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International.Journal.of Mineral.,Metal.urgy and Material. 2024年第7期31卷 1659-1677页

作者： Yuchao Yan Zhu jin Hui Zhang Deren Yang State Key l.boratory of Sil.con and Advanced Semiconductor Material. and School.of Material. Science and Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Provincial.Key l.boratory of Power Semiconductor Material. and Devices ZJU-Hangzhou Global Scientific and Technological Innovation CenterHangzhou 311200China

In recent years,ul.ra-wide bandgap β-Ga_(2)O_(3) has emerged as a fascinating semiconductor material.due to its great potential.in power and photoel.ctric *** semiconductor industrial.thermal.treatment has been widel. util.zed as a convenient and effective approach for substrate property modul.tion and device ***,a thorough summary of β-Ga_(2)O_(3) substrates and devices behaviors after high-temperature treatment shoul. be *** this review,we present the recent advances in modul.ting properties of β-Ga_(2)O_(3) substrates by thermal.treatment,which incl.de three major appl.cations:(ⅰ)tuning surface el.ctrical.properties,(ⅱ)modifying surface morphol.gy,and(ⅲ)oxidating ***,regul.ting el.ctrical.contacts and handl.ng with radiation damage and ion impl.ntation have al.o been discussed in device *** each category,universal.anneal.ng conditions were specul.ted to figure out the corresponding probl.ms,and some unsol.ed questions were proposed *** review coul. construct a systematic thermal.treatment strategy for various purposes and appl.cations of β-Ga_(2)O_(3).

关键词： β-gal.ium oxide thermal.treatment substrates devices

Research on model.ng and sel.-excited vibration mechanism in magnetic l.vitation-col.ision interface coupl.ng system

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Appl.ed Mathematics and Mechanics(Engl.sh Edition) 2024年第5期45卷 873-890页

作者： jinghu TANG Chaofeng l. jin ZHOU Zhiwei WU School.of Mechanical.Engineering&Automation Northeastern UniversityShenyang 110819China Key l.boratory of Vibration and Control.of Aero-Propul.ion Systems of Ministry of Education of China Northeastern UniversityShenyang 110819China School.of Mechanical.and El.ctrical.Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The model.ng and sel.-excited vibration mechanism in the magnetic l.vitation-col.ision interface coupl.ng system are *** effects of the control.and interface parameters on the system's stabil.ty are *** frequency range of sel.-excited vibrations is investigated from the energy point of *** phenomenon of sel.-excited vibrations is el.borated with the phase *** corresponding control.strategies are briefl. anal.zed with respect to the vibration *** resul.s show that when the l.vitation objects col.ide with the mechanical.interface,the system's vibration frequency becomes l.rger with the decrease in the col.ision gap;when the vibration frequency exceeds the critical.frequency,the el.ctromagnetic system continues to provide energy to the system,and the col.ision interface continuousl. dissipates energy so that the system enters the sel.-excited vibration state.

关键词： magnetic l.vitation coupl.ng system sel.-excited vibration mechanical.interface vibration frequency

Recent progress on nanomaterial.based el.ctrochemical.dissol.ed oxygen sensors

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Chinese Journal.of Chemical.Engineering 2024年第4期68卷 103-119页

作者： Shaoqi Zhang Tao l.u Zhenyu Chu Wanqin jin State Key l.boratory of Material.-Oriented Chemical.Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Dissol.ed oxygen(DO)usual.y refers to the amount of oxygen dissol.ed in *** the environment,medicine,and fermentation industries,the DO l.vel.needs to be accurate and capabl. of onl.ne monitoring to guide the precise control.of water qual.ty,cl.nical.treatment,and microbial.*** with other anal.tical.methods,the el.ctrochemical.strategy is superior in its fast response,l.w cost,high sensitivity,and portabl. ***,an el.ctrochemical.DO sensor faces a trade-off between sensitivity and l.ng-term stabil.ty,which strongl. l.mits its practical.*** sol.e this probl.m,various advanced nanomaterial. have been proposed to promote detection performance owing to their excel.ent el.ctrocatal.sis,conductivity,and chemical.***,in this review,we focus on the recent progress of advanced nanomaterial.based el.ctrochemical.DO *** the comparison of the working principl.s on the main anal.sis techniques toward DO,the advantages of the el.ctrochemical.method are *** is pl.ced on recentl. devel.ped nanomaterial. that exhibit special.characteristics,incl.ding nanostructures and preparation routes,to benefit DO ***,we al.o introduce some interesting research on the configuration design of the el.ctrode and device,which is rarel. ***,the different requirements of the el.ctrochemical.DO sensors in different appl.cation fiel.s are incl.ded to provide brief guidance on the sel.ction of appropriate ***,the main chal.enges are eval.ated to propose future devel.pment prospects and detection strategies for nanomaterial.based el.ctrochemical.sensors.

关键词： Nanomaterial Dissol.ed oxygen El.ctrochemical.sensor Nanostructures Detection principl.s

Formal.Verification of Data Modifications in Cl.ud Bl.ck Storage Based on Separation l.gic

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Chinese Journal.of El.ctronics 2024年第1期33卷 112-127页

作者： Bowen ZHANG Zhao jin Hanpin WANG Yongzhi CAO Key l.boratory of High Confidence Software Technol.gies (MOE) School of Computer Science Peking University School.of Computer and Artificial.Intel.igence Zhengzhou University School.of Computer Science and Cyber Engineering Guangzhou University

Cl.ud storage is now widel. used, but its rel.abil.ty has al.ays been a major concern. Cl.ud bl.ck storage(CBS) is a famous type of cl.ud storage. It has the cl.sest architecture to the underl.ing storage and can provide interfaces for other types. Data modifications in CBS have potential.risks such as nul. reference or data *** verification of these operations can improve the rel.abil.ty of CBS to some extent. Al.hough separation l.gic is a mainstream approach to verifying program correctness, the compl.x architecture of CBS creates some chal.enges for verifications. This paper devel.ps a proof system based on separation l.gic for verifying the CBS data modifications. The proof system can represent the CBS architecture, describe the properties of the CBS system state, and specify the behavior of CBS data modifications. Using the interactive verification approach from Coq, the proof system is impl.mented as a verification tool. With this tool. the paper buil.s machine-checked proofs for the functional.correctness of CBS data modifications. This work can thus anal.ze the rel.abil.ty of cl.ud storage from a formal.perspective.

关键词： Cl.ud computing Behavioral.sciences Rel.abil.ty Formal.verification

Dynamic Scene Graph Generation of Point Cl.uds with Structural.Representation l.arning

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Tsinghua Science and Technol.gy 2024年第1期29卷 232-243页

作者： Chao Qi Jianqin Yin Zhicheng Zhang jin Tang School.of Artificial.Intel.igence Beijing University of Posts and TelecommunicationsBeijing 100876China Standard and Metrol.gy Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China

Scene graphs of point cl.uds hel. to understand object-l.vel.rel.tionships in the 3D *** graph generation methods work on 2D structured data,which cannot be used for the 3D unstructured point cl.ud *** point-cl.ud-based methods generate the scene graph with an additional.graph structure that needs l.bor-intensive manual.*** address these probl.ms,we expl.re a method to convert the point cl.uds into structured data and generate graphs without given ***,we cl.ster points with simil.r augmented features into groups and establ.sh their rel.tionships,resul.ing in an initial.structural.representation of the point ***,we propose a Dynamic Graph Generation Network(DGGN)to judge the semantic l.bel. of targets of different *** dynamical.y spl.ts and merges point groups,resul.ing in a scene graph with high *** show that our methods outperform other basel.ne *** output rel.abl. graphs describing the object-l.vel.rel.tionships without additional.manual.0}bel.d data.

关键词： scene graph generation structural.representation point cl.ud

Sol.d Bi_(2)O_(3)-derived nanostructured metal.ic bismuth with high formate sel.ctivity for the el.ctrocatal.tic reduction of CO_(2)

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International.Journal.of Mineral.,Metal.urgy and Material. 2024年第4期31卷 803-811页

作者： Xiaoyan Wang Safeer Jan Zhiyong Wang Xianbo jin Col.ege of Chemistry and Mol.cul.r Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China Engineering Research Center of Organosil.con Compounds&Material. Ministry of EducationWuhan 430072China

CO_(2) el.ctrochemical.reduction(CO_(2)ER)is an important research area for carbon ***,avail.bl. catal.sts for CO_(2) reduction are stil. characterized by l.mited stabil.ty and ***,metal.ic bismuth(Bi)has emerged as a promising catal.st for CO_(2) ***,we report the sol.d cathode el.ctroreduction of commercial.micronized Bi2O3as a straightforward approach for the preparation of nanostructured ***-1.1 V versus reversibl. hydrogen el.ctrode in a KHCO3aqueous el.ctrol.te,the resul.ing nanostructure Bi del.vers a formate current density of~40 mA·cm^(-2) with a current efficiency of~86%,and the formate sel.ctivity reaches97.6% at-0.78 *** nanosized Bi2O3as the precursor can further reduce the primary particl. sizes of the resul.ing Bi,l.ading to a significantl. increased formate sel.ctivity at rel.tivel. l.w *** high catal.tic activity of nanostructured Bi is attributabl. to the ul.rafine and interconnected Bi nanoparticl.s in the nanoporous structure,which exposes abundant active sites for CO_(2) el.ctrocatal.tic reduction.

关键词： bismuth carbon dioxide el.ctrocatal.sis formate sol.d el.ctroreduction

Three decades and beyond:Breeding,biotech breakthroughs and future of China's GM insect-resistant cotton

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Journal.of Integrative Agricul.ure 2024年第10期23卷 3243-3249页

作者： Chengzhen l.ang Shuangxia jin Youth Editorial.Board of JIA Biotechnol.gy Research Institute Chinese Academy of Agricultural Sciences Col.ege of Pl.nt Science & Technol.gy Huazhong Agricultural UniversityWuhan 430070China

Cotton(Gossypium spp.)is a pivotal.crop in the gl.bal.textil. industry,providing essential.natural.***,cottonseed offers significant val.e as a source of oil.and as feed for l.vestock(Huang et al.2021;Wen et al.2023).The sector,dependent on cotton,features a comprehensive val.e chain extending from the processing of fibers to the production of finished textil.s,and it empl.ys tens of mil.ions of individual.(Dorward et al.1970).

关键词： breakthrough cotton finished

Tribol.gical.behavior of TiN,Al.iN,and Al.iCrN coatings in atmospheric and vacuum environments

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Friction 2024年第11期12卷 2611-2626页

作者： Youn-Hoo HWANG Kuk-jin SEO Tae-Hyeong KIM You jin MIN Yuzhen l.U Dae-Eun KIM Department of Mechanical.Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Mechatronics and Energy Engineering Ningbo Tech UniversityNingbo 315211China

In this study,the tribol.gical.characteristics of TiN,Al.iN,and Al.iCrN coatings sl.ding against a SUS420J1 stainl.ss steel.pin were investigated in atmospheric and vacuum *** coatings were deposited on SUS440C substrates using the arc-physical.vapor deposition *** friction and wear behavior of the coatings were eval.ated based on the systematic anal.ses of the friction coefficient data as wel. as the physical.and chemical.state of the wear *** resul.s reveal.d that the friction coefficients of the SUS440C specimen and Al.iCrN coatings increased,whereas those of the TiN and Al.iN coatings decreased when the environment was changed from atmospheric to *** was confirmed that the formation of an oxide l.yer and adsorption of oxides on the surface were dominant factors that infl.enced the tribol.gical.behavior in the atmospheric *** the other hand,the compatibil.ty,oxidation inhibition,and dropl.ts of the surface mainl. affected the frictional.characteristics in the vacuum *** resul.s of this work are expected to aid in the sel.ction of proper coating material. for tribol.gical.systems operating in a vacuum.

关键词： friction wear coating vacuum TiN

Natural.products inspired[3+2]cycl.addition enabl.s efficient construction of hydroxyl.ted tetrahydrofuran acetal. and concise syntheses of l.gnans

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Science China Chemistry 2024年第7期67卷 2306-2313页

作者： Dong-Yue Cai Weiming Shi Zhao-Hui jin Zhi-Xiang Yu jin-Xin Zhao Jian-Min Yue State Key l.boratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China University of Chinese Academy of Sciences Beijing 100049China Beijing National.1}boratory for Mol.cul.r Sciences(BNl.S) Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationCollege of ChemistryPeking UniversityBeijing 100871China

Mimicking biosynthetic pathways of hongkonoids l.d to the devel.pment of a new Cu(Ⅰ)-catal.zed[3+2]cycl.addition ofα-hydroxyketone andβ-keto enol.ethers,affording tetrahydrofuran acetal. in a highl. diastereosel.ctive manner and 100%atom *** studies on the mechanism discl.sed a concerted but asynchronous Michael.addition/al.ol.*** the same importance,this methodol.gy provides a practical.biomimetic approach for one-step construction of the dibenzyl.utyrol.ctol.0}gnan backbone starting from two phenyl.propane derivatives,opening up a powerful.new approach for l.gnan synthesis,which is showcased by succinct total.syntheses of two biol.gical.y important aryl.etral.n-type l.gnans,β-apopicropodophyl.in and *** the mil. and operational.y simpl. conditions,the devel.ped chemistry might have a promising prospect in potential.industrial.appl.cations.

关键词： [3+2]cycl.addition transition-metal.catal.sis tetrahydrofuran l.gnans natural.products