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Effect of Y_(2)O_(3) on microstructure and properties of CoCrFeNiTiNb high entropy alloy coating on Ti-6Al-4V surface by laser cladding

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Journal of Rare Earths 2024年第3期42卷 586-599,I0006页

作者： Zhen Li Wei Zhao Kedong Yu Ning Guo Guangchun Xiao zhiming wang Hui Zhang College of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China Shandong Institute of Mechanical Design and Research Jinan250031China

The effects of Y_(2)O_(3) on the microstructure, microhardness, wear resistance, high-temperature oxidation resistance, hot corrosion resistance, and electrochemical corrosion behaviour of CoCrFeNiTiNb high entropy alloy coatings formed on Ti-6Al-4V alloy surfaces were studied. The results show that the addition of Y_(2)O_(3) changes the proportion of the phase but does not change its type. The average grain size is only 1/4.7 of that of the high entropy alloy(HEA) coating, and the fine-grained strengthening leads to increases in the microhardness and wear resistance of 21.8% and 26.9%, respectively. The addition of Y_(2)O_(3) enhances the denseness and bonding properties of the oxide and corrosion product layers, reducing the oxidation and hot corrosion rates by 60.3% and 40.3%, respectively. The addition of Y_(2)O_(3) doubles the corrosion resistance which is attributed to the refinement of the grains, the increased proportion of HCP and TiN, and the weakening of galvanic coupling corrosion.

关键词： Laser cladding High entropy alloy coatings Rare earths Wear properties High temperature properties Electrochemical corrosion

Microstructure and Properties of AlCoCrFeNiTi High-Entropy Alloy Coatings Prepared by Laser Cladding

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Journal of Harbin Institute of Technology(New Series) 2024年第2期31卷 50-61页

作者： Mengxian Li Zhiping Sun Zhaomin Xu zhiming wang Qingdao ADR Axles Manufacturing Co. LtdShandong Qingdao 266400China School of Mechanical&Automotive Engineering Qilu University of Technology(Shandong Academy of Sciences)Ji'nan 250300China

21-4N(5Cr21Mn9Ni4N)is extensively employed in the production of engine valves,operating under severe *** from withstanding high-temperature gas corrosion,it must also endure the impact of cylinder explosion *** predominant failure mode of 21-4N valves is abrasive *** coatings serve as an effective approach to prevent such *** this investigation,Laser cladding technology was utilized to fabricate AlCoCrFeNiTi high entropy alloy coatings onto the surfaces of 21-4N *** to the findings,the cladding zone has a normal dendritic microstructure,a good substrate-to-cladding layer interaction,and no obvious *** terms of hardness,the cladding demonstrates an average hardness of 620 *** hardness has increased by 140%compared to the *** average hardness of the cladding remains at approximately 520 HV even at elevated *** frictional wear performance,between 400℃and 800℃,the cladding layer exhibits an average friction coefficient of 0.4,with the primary wear mechanisms being abrasive wear,adhesive wear,and a minor degree of plastic deformation.

关键词： high entropy alloy laser cladding microstructure microstructure and properties

Unveiling the chemistry behind the electrolytic production of hydrogen peroxide by oxygenated carbon

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Journal of Energy Chemistry 2024年第9期96卷 49-58页

作者： Pan Xiang Kunshang Yang Qihao Yang Yang Gao Wenwen Xu Zhiyi Lu Liang Chen zhiming wang Ziqi Tian Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201ZhejiangChina Institute for Advanced Study Chengdu UniversityChengdu 610106SichuanChina

Oxygenated carbon materials exhibit outstanding electrocatalytic performance in the production of hydrogen peroxide(H2O2)through a two-electron oxygen reduction *** nature of the active functional group and underlying reaction mechanism,however,remain ***,a comprehensive workflow was established to identify the active sites from the numerous possible *** common hydroxyl group at the notched edge demonstrates a key role in the two-electron *** local chemical environment weakens the binding of OOH intermediate to substrate while enhancing interaction with solution,thereby promoting the H_(2)O_(2)*** increasing pH,the intramolecular hydrogen bond between OOH intermediate and hydroxyl decreases,facilitating OOH ***,the rise in selectivity with increasing potential stems from the suppression of the four-electron *** active site was further validated through *** by theoretical understanding,optimal performance was achieved with high selectivity(>95%)and current density(2.06 mA/cm^(2))in experiment.

关键词： First-principles calculation Oxygen reductionreaction Hydrogen peroxide production Fixed-potential method Oxygenated carbon materials

Fabricating AC/DC nanogenerators based on single ZnO nanowires by using a nanomanipulator in a scanning electron microscope

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Nanotechnology and Precision Engineering 2024年第2期7卷 25-31页

作者： Mei Liu Mengfan He Aristide Djoulde Lingdi Kong Weilin Su Xin Bai Jinbo Chen Jinjun Rao zhiming wang Shanghai Key Laboratory of Intelligent Manufacturing and Robotics School of Mechatronic Engineering and AutomationShanghai UniversityShanghai 200444China Guangdong Provincial Key Laboratory of Fuel Cell Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641China

Single zinc oxide nanowires(ZnO NWs)are promising for nanogenerators because of their excellent semiconducting and piezoelectric properties,but characterizing the latter efficiently is *** reported here,an electrical breakdown strategy was used to construct single ZnO NWs with a specific *** the high operability of a nanomanipulator in a scanning electron microscope,ZnO-NW-based twoprobe and three-probe structures were constructed for fabricating AC/DC nanogenerators,*** a ZnO NW,an AC output of between−15.31 mV and 5.82 mV was achieved,while for a DC nanogenerator,an output of24.3 mV was ***,the three-probe structure’s output method was changed to verify the distribution of piezoelectric charges when a single ZnO NW is bent by a probe,and DC outputs of different amplitudes were *** study provides a low-cost,highly convenient,and operational method for studying the AC/DC output characteristics of single NWs,which is beneficial for the further development of nanogenerators.

关键词： Zinc oxide nanowire Piezoelectric properties Nanomanipulator SEM AC/DC nanogenerators

Circular polarization-selective optical,photothermal,and optofluidic effects in chiral metasurfaces

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Photonics Research 2024年第2期12卷 331-340页

作者： CUIPING MA PENG YU ZHIMIN JING YISONG ZHU PEIHANG LI WENHAO wang HONGXING XU YANNING ZHANG LIANG PAN TAE-YOUL CHOI ARUP NEOGI ALEXANDER OGOVOROV zhiming wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore School of Physics and Technology Center for Nanoscience and NanotechnologyWuhan UniversityWuhan 430072China Department of Mechanical Engineering University of North TexasDentonTexas 76207USA Department of Physics and Astronomy and Nanoscale and Quantum Phenomena Institute Ohio UniversityAthensOhio 45701USA

Circular dichroism (CD) is extensively used in various material systems for applications including biological detection,enantioselective catalysis,and chiral *** paper introduces a chiral absorptive metasurface that exhibits a circular polarization-selective effect in dual bands-positive and negative CD peaks at short wavelengths and long wavelengths,***,we uncover that this phenomenon extends beyond the far-field optical response,as it is also observed in the photothermal effect and the dynamics of thermally induced fluid *** carefully engineering the metasurface design,we achieve two distinct CD signals with high g factors (1) at the wavelengths of 877 nm and 1045 nm,*** findings presented in this study advance our comprehension of CD and offer promising prospects for enhancing chiral light–matter interactions in the domains of nanophotonics and optofluidics.

关键词： chiral catalysis circular

Progress in manipulating spin polarization for solar hydrogen production

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Materials Reports(Energy) 2024年第1期4卷 43-57页

作者： Qian Yang Xin Tong zhiming wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054PR China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001PR China Institute for Advanced Study Chengdu UniversityChengdu 610106PR China

Photocatalytic and photoelectrochemical water splitting using semiconductor materials are effective approaches for converting solar energy into hydrogen *** the past few years,a series of photocatalysts/photoelectrocatalysts have been developed and optimized to achieve efficient solar hydrogen *** various optimization strategies,the regulation of spin polarization can tailor the intrinsic optoelectronic properties for retarding charge recombination and enhancing surface reactions,thus improving the solar-to-hydrogen(STH)*** review presents recent advances in the regulation of spin polarization to enhance spin polarized-dependent solar hydrogen evolution ***,spin polarization manipulation strategies of several typical photocatalysts/photoelectrocatalysts(e.g.,metallic oxides,metallic sulfides,non-metallic semiconductors,ferroelectric materials,and chiral molecules)are *** the end,the critical challenges and perspectives of spin polarization regulation towards future solar energy conversion are briefly provided.

关键词： Spin polarization Solar energy conversion Photocatalytic hydrogen production Photoelectrochemical water splitting

Colloidal quantum dots and two-dimensional material heterostructures for photodetector applications

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Electron 2024年第2期2卷 123-158页

作者： Jingying Luo Gurpreet Singh Selopal Xin Tong zhiming wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduChina Department of Engineering Faculty of AgricultureDalhousie UniversityTruroNova ScotiaCanada Key Laboratory of Quantum Physics and Photonic Quantum Information Ministry of EducationUniversity of Electronic Science and Technology of ChinaChengduChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhouChina Institute for Advanced Study Chengdu UniversityChengduChina

Photodetectors(PDs)are optoelectronic devices that convert optical signals into electrical ***,there has been a tremendous increase in research interest in PDs based on colloidal quantum dots(QDs)and two-dimensional(2D)material heterostructures owing to the strong light-absorption capacity and the well-adjustable band gap of QDs and the superior charge carriers transfer ability of 2D *** particular,the heterojunction formed between QDs and 2D materials can effectively enhance the separation and transport of photogenerated charge carriers,which is expected to establish PDs with ultrahigh photoconductive gain,high responsivity,and *** review aimed to summarize the state-of-the-art advances in the research of QDs/2D material nanohybrid PDs,including the device parameters,archi-tectures,working mechanisms,and fabrication *** prog-ress of hybrid PDs based on the heterojunction of QDs with different 2D materials,along with their innovative applications,are comprehensively *** the end,the challenges and feasible strategies in future research and development are briefly proposed.

关键词： heterostructures photodetectors quantum dots two-dimensional materials

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内幕交易民事赔偿制度之审思

交大法学 2024年第4期 112-129页

作者：王志明中国证监会深圳监管局

随着证券虚假陈述民事赔偿制度改革成效渐次显现,在立体追责的政策导向下,内幕交易民事责任的制度构建似乎势在必行。但基于内幕交易的特殊行为构造,其民事责任面临理论与实践的双重困境。现有诸多学说既难以令人信服地解释因果关系,也... 详细信息

随着证券虚假陈述民事赔偿制度改革成效渐次显现,在立体追责的政策导向下,内幕交易民事责任的制度构建似乎势在必行。但基于内幕交易的特殊行为构造,其民事责任面临理论与实践的双重困境。现有诸多学说既难以令人信服地解释因果关系,也无法精准识别所谓的适格原告。立法进程上曾有细化赔偿规则的激进尝试,但因其规范逻辑、功能定位等方面的诸多争议而失败。相关司法实践案例极为稀少,且多以原告败诉、撤诉告终,仅有的一起原告胜诉案件,其法理逻辑也多有可议之处。在我国对内幕交易实施惩罚性赔偿可能导致责任过苛,也无助于提升惩处概率;内幕交易对投资者的损害具有整体性和抽象性,比较法上并无强化民事追责的趋向。其民事赔偿制度的先天不足亦难以在传统私法责任框架下通过规则修补而获得“新生”。立足我国实际,本土化构建以证券公共执法促进投资者“私利”实现的公共补偿制度或是高效填补内幕交易损害、增强投资者信心的更优方案。

关键词：内幕交易民事赔偿因果关系适格原告公共补偿

基于CESE方法的煤矿风井泄爆全过程模拟与消波增效研究

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煤炭科学技术 2024年第5期52卷 127-138页

作者：宋维宾孙玉宁王永龙王志明河南理工大学能源科学与工程学院河南焦作454003 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454003

为揭示煤矿风井泄爆过程、探寻增强泄爆效果方法,针对现行泄爆方法和多种改进泄爆方法,建立了系列全尺寸三维仿真模型,利用LS−DYNA软件的CESE求解器,进行了全过程流固耦合模拟分析。结果表明:现行防爆门在泄爆过程中会引发较强烈的反射... 详细信息

为揭示煤矿风井泄爆过程、探寻增强泄爆效果方法,针对现行泄爆方法和多种改进泄爆方法,建立了系列全尺寸三维仿真模型,利用LS−DYNA软件的CESE求解器,进行了全过程流固耦合模拟分析。结果表明:现行防爆门在泄爆过程中会引发较强烈的反射冲击波且不能快速有效地予以消弱,致使风硐中先后出现可对风机造成二次冲击的2道冲击波;去除防爆门立壁结构对提升泄爆效果作用不明显,但可使防爆门受到的冲击明显减弱;在一定范围内,减轻防爆门质量对提高泄爆效果的作用较为有限,且会使防爆门吸收的爆炸能量明显增加;在增量不大的情况下,增大防爆门到风井和风硐交岔点的距离即能有效改善泄爆效果;侧向和正向先行泄爆方法均能明显增强泄爆效果,并对防爆门有显著的减冲和保护作用,在算例条件下,最优可使反射波超压峰值下降49.4%和28.3%;防爆门开启时间、泄爆面积和防爆门到风井/风硐交岔点的距离是影响泄爆效果的重要因素;风井达到良好泄爆效果所需要的开启时间比现行防爆门要短得多;仅在井口设置防爆门存在不能消减风硐中第1道冲击波超压峰值的局限性。基于对风井泄爆过程、机理和方法的新认识,提出了以“两区域多通道”泄爆为特征的主辅防爆门协同泄爆方法,以系统提升风井泄爆效果和防爆水平。

关键词：风井煤矿风井泄爆先行泄爆协同泄爆防爆门流固耦合