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Abnormal grain growth induced byδ→γphase transformation in Fe-based shape memory alloys

Journal of Materials Science & Technology 2024年第5期172卷 196-201页

作者： Huabei Peng Liqiu Yong gaixia wang Jiazhen Yan Bing Xu Yuhua Wen School of Mechanical Engineering Sichuan UniversityChengdu 610065China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China

Grain boundaries,including low-angle,high-angle,and coinci-dence boundaries,are intrinsic interfaces in polycrystalline materi-als.During heat-treatment at sufficiently high temperatures,grain boundary migration occurs because the grain boundaries are ther-modynamically unstable.Consequently,grain growth occurs due to a decrease in grain boundary area after heat-treatment[1].In general,there are two types of grain growth:normal grain growth,where grains grow uniformly,and abnormal grain growth,where one or a few grains selectively grow and engulf surround-ing smaller grains,leading to the formation of large grains,some-times several millimeters or greater in size[2].The classical tech-nique to achieve abnormal grain growth is the strain-annealing method,which involves subjecting the material to a small strain followed by annealing[3,4].This method has been reported to ob-tain single-crystal wires or plates[1].Additionally,abnormal grain growth can be achieved by plastic straining at high temperatures,resulting in the fabrication of large grains or single crystals[5].However,the above methods are not applicable to components with complicated shapes due to the inevitable deformation pro-cess.Recently,Omori et al.developed a simply method of abnor-mal grain growth to fabricate ultra-large grains,even single crys-tals,in Cu-Al-Mn[1],Fe-Mn-Al-Ni[2],and Fe-Mn-Al-Ni-Cr[6]al-loys.This method involves applying cyclic heat treatment between a high temperature BCC single-phase region and a low tempera-ture BCC+FCC two-phase region[1,2,6-12].Note that the cyclic heat treatment resulted in the formation of BCC sub-grain struc-tures responsible for abnormal grain growth[1,2,6-12].In addition,Yang et al.reported that abnormal grain growth occurred at above 900℃,and large-grains,even single crystals,were obtained only through annealing cast Cu-based polycrystalline alloys contained coherent nano-particles[13,14].Notably,the cyclic heat treatment and annealing cast alloys are deformation-free and much simpler than the strain-anne

关键词： grain alloys deformation

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Central Reflexive Rings with an Involution

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Journal of Mathematical Research with Applications 2020年第2期40卷 119-126页

作者： Beilei GAO gaixia wang School of Mathematics and Physics Anhui University of Technology

We study the central reflexive properties of rings with an involution. The concept of central *-reflexive rings is introduced and investigated. It is shown that central *-reflexive rings are a generalization of reflexive rings, central reflexive rings and *-reflexive rings. Some characterizations of this class of rings are given. The related ring extensions including trivial extension, Dorroh extension and polynomial extensions are also studied.

关键词： *-reflexive rings central *-reflexive rings central *-semicommutative ring Dorroh extension

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Finite Two-Arc-Regular Graphs Admitting an Almost Simple Group

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Journal of Mathematical Research with Applications 2021年第1期41卷 7-13页

作者： gaixia wang Beilei GAO School of Mathematics and Physics Anhui University of Technology

This paper completes the classification of (G, 2)-arc-regular graphs of square-free order where G is an almost simple group.

关键词： coset graph two-arc-regular automorphism group square-free

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Special issue on electrochemical energy storage and conversion

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Frontiers in Energy 2024年第2期18卷 125-127页

作者： Yun ZHENG gaixia ZHANG Sixu DENG Jiujun ZHANG Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Department of Electrical Engineering École de Technologie Supérieure(ÉTS)Universitédu QuébecMontréalH3C 1K3Canada Department of Chemical and Materials Engineering Concordia UniversityMontrealQC H3G 1M8Canada

The escalating global consumption of fossil fuels has significantly elevated the levels of CO_(2)in the atmosphere,leading to an undesirable global energy crisis and environmental degradation.Rapid deployment of renewable energy resources is crucial to mitigate these challenges.In recent years,there has been noteworthy progress in electrochemical energy storage and conversion techniques and devices,including hydrogen energy and fuel cells,advanced energy storage and power batteries,and CO_(2)electrochemical conversion and utilization.

关键词： electrochemical energy elevated

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Strategies to achieve effective nitrogen activation

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Carbon Energy 2024年第5期6卷 137-163页

作者： Bin Chang Huabin Zhang Shuhui Sun gaixia Zhang KAUST Catalysis Center(KCC) King Abdullah University of Science and Technology(KAUST)ThuwalKingdom of Saudi Arabia Institut National de la Recherche Scientifique(INRS) CentreÉnergie Matériaux TélécommunicationsVarennesQuébecCanada Department of Electrical Engineering École de Technologie Supérieure(ÉTS)MontréalQuébecCanada

Ammonia serves as a crucial chemical raw material and hydrogen energy carrier.Aqueous electrocatalytic nitrogen reduction reaction(NRR),powered by renewable energy,has attracted tremendous interest during the past few years.Although some achievements have been revealed in aqueous NRR,significant challenges have also been identified.The activity and selectivity are fundamentally limited by nitrogen activation and competitive hydrogen evolution.This review focuses on the hurdles of nitrogen activation and delves into complementary strategies,including materials design and system optimization(reactor,electrolyte,and mediator).Then,it introduces advanced interdisciplinary technologies that have recently emerged for nitrogen activation using high-energy physics such as plasma and triboelectrification.With a better understanding of the corresponding reaction mechanisms in the coming years,these technologies have the potential to be extended in further applications.This review provides further insight into the reaction mechanisms of selectivity and stability of different reaction systems.We then recommend a rigorous and detailed protocol for investigating NRR performance and also highlight several potential research directions in this exciting field,coupling with advanced interdisciplinary applications,in situ/operando characterizations,and theoretical calculations.

关键词： activation via mediators catalyst optimization electrochemical nitrogen fixation high-energy activation of nitrogen nitrogen

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Advancements on metal oxide semiconductor photocatalysts in photo-electrochemical conversion of carbon dioxide into fuels and other useful products

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Frontiers in Energy 2024年第2期18卷 187-205页

作者： Jai PRAKASH Zhangsen CHEN Shakshi SAINI gaixia ZHANG Shuhui SUN Department of Chemistry National Institute of Technology HamirpurHamirpur 177005India Institut National de la Recherche Scientifique(INRS) Centre Énergie Matériaux TélécommunicationsVarennes J3X 1P7Canada Department of Chemistry Indian Institute of Technology MandiHimachal PradeshIndia Department of Electrical Engineering École de Technologie SupérieureMontréal H3C 1K3Canada

Due to its fascinating and tunable optoelectronic properties,semiconductor nanomaterials are the best choices for multidisciplinary applications.Particularly,the use of semiconductor photocatalysts is one of the promising ways to harness solar energy for useful applications in the field of energy and environment.In recent years,metal oxide-based tailored semiconductor photocatalysts have extensively been used for photocatalytic conversion of carbon dioxide(CO_(2))into fuels and other useful products utilizing solar energy.This is very significant not only from renewable energy consumption but also from reducing global warming point of view.Such current research activities are promising for a better future of society.The present mini-review is focused on recent developments(2–3 years)in metal oxide semiconductor hybrid photocatalysts-based photo-electrochemical conversion of CO_(2)into fuels and other useful products.First,general mechanism of photo-electrochemical conversion of CO_(2)into fuels or other useful products has been discussed.Then,various metal oxide-based emerging hybrid photocatalysts including tailoring of their morphological,compositional,and optoelectronic properties have been discussed with emphasis on their role in enhancing photoelectrochemical efficienty.Afterwards,mechanism of their photo-electrochemical reactions and applications in CO_(2)conversion into fuels/other useful products have been discussed.Finally,challenges and future prospects have been discussed followed by a summary.

关键词： metal-oxide semiconductors nanohybrid photocatalysts photo-electrochemical CO_(2)conversion tailoring morphology fuels challenges and future prospects

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课程思政视角下高校会计专业《审计学》课程改革研究

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中国乡镇企业会计 2022年第2期 181-183页

作者：王改霞安阳师范学院商学院

课程思政的目的是挖掘课程的思政元素,发挥课堂教学的主导作用,达到技能培养与思政教育的有机统一。《审计学》作为会计专业的一门核心课程,将思政教育融入到专业课教学中,对于人才培养具有至关重要的意义。本文针对课程思政视角下《审... 详细信息

课程思政的目的是挖掘课程的思政元素,发挥课堂教学的主导作用,达到技能培养与思政教育的有机统一。《审计学》作为会计专业的一门核心课程,将思政教育融入到专业课教学中,对于人才培养具有至关重要的意义。本文针对课程思政视角下《审计学》课程改革的现状以及意义进行了探讨,并提出了创新教学方法、重置教学目标、优化教学内容、改革课程评价等一系列方法措施,以期对会计专业课程思政教学改革提供借鉴意义。

关键词：课程思政会计专业审计学教学改革

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人教社2019版高中英语教材中国文化融合研究

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内江师范学院学报 2022年第1期37卷 91-95页

作者：王改霞内江师范学院外国语学院四川内江641100

2017版的《普通高中英语课程标准》将“文化意识”列为英语学科核心素养之一,强调尊重和包容文化多元性的同时,加强中国文化学习。人教社2019版高中英语教材中中国文化所占比重大幅度增加,做到了目标语文化和中国文化所占比重总体上相... 详细信息

2017版的《普通高中英语课程标准》将“文化意识”列为英语学科核心素养之一,强调尊重和包容文化多元性的同时,加强中国文化学习。人教社2019版高中英语教材中中国文化所占比重大幅度增加,做到了目标语文化和中国文化所占比重总体上相对均衡,纠正了以往英语教材中目标语文化占主导、中国文化失语或重视不足等问题。同时,新教材在中国文化内容的设置上涉及面广,体现出时代性特征,但也存在各类文化因素分配不均衡、少数民族文化涉及少等问题。因此,教材修订时应注意中国文化各要素的均衡配置。在教材的使用中,应充分挖掘其中国文化元素,重视中国文化渗透在英语教育中的重要性。

关键词：高中英语教材中国文化

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核电站蒸汽发生器再循环水质量流量实时估计方法

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上海交通大学学报 2022年第1期56卷 21-27页

作者：惠久武凌君栾振华王改霞董贺袁景淇中广核工程有限公司核电安全监测技术与设备国家重点实验室广东深圳518172 上海交通大学自动化系上海200240

根据蒸汽发生器的实际结构,将蒸汽发生器划分为热段、冷段、汽水分离器和汽室,热段和冷段又划分为下降通道和上升通道.基于质量、能量、动量守恒定律,依次建立蒸汽发生器热段、冷段、汽水分离器和汽室分布的参数模型.结合工质物性参数... 详细信息

根据蒸汽发生器的实际结构,将蒸汽发生器划分为热段、冷段、汽水分离器和汽室,热段和冷段又划分为下降通道和上升通道.基于质量、能量、动量守恒定律,依次建立蒸汽发生器热段、冷段、汽水分离器和汽室分布的参数模型.结合工质物性参数数据库和数据采集系统(DCS)实时测量数据实时求解模型,从而获得蒸汽发生器再循环水的质量流量估计值.采用某CPR1000核电机组运行数据的验证结果表明,由所提方法解算得到的蒸汽发生器顶部出口饱和蒸汽温度、压力和质量流量与实测值吻合较好,从而间接证实了蒸汽发生器再循环水质量流量估计的正确性.

关键词：蒸汽发生器分布参数模型再循环水质量流量实时估计

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Design of Metering Device Key Parts of Pneumatic Grass Seeder

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Journal of Earth Science and Engineering 2015年第5期5卷 289-295页

作者： Zhai gaixia wang Zhenhua He Gang Liu Guilin Yang Li Hohhot Branch of Chinese Academy of Agricultural Mechanization Sciences Hohhot 010020 China

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