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Hollow FeCoNiAl microspheres with stabilized magnetic properties for microwave absorption

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Nano Research 2024年第3期17卷 2079-2087页

作者： Linhe Yu Gangjie Lian Guozhen Zhu sue Ren Yanfang Du Xuhui Xiong Rui Chen Jincang Zhang Wenbin You Renchao Che Institute of Advanced Materials College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438China Zhejiang Laboratory Hangzhou 311100China Capital Aerospace Machinery Corporation Limited Beijing 100000China AECC Beijing Institute of Aeronautical Materials Beijing 100095China International Center for Quantum and Molecular Structures Materials Genome InstitutePhysics DepartmentShanghai UniversityShanghai 200444China

Development of high-performance microwave absorption materials(MAM)with stabilized magnetic properties at high temperatures is specifically essential but remains ***,the Snoke's limitation restrains the microwave absorption(MA)property of magnetic *** alloy components is considered an effective way to solve the aforementioned ***,a hollow medium-entropy FeCoNiAl alloy with a stable magnetic property is prepared via simple spray-drying and two-step annealing for efficient *** exhibited an ultrabroad effective absorption band(EAB)of 5.84 GHz(12.16–18 GHz)at a thickness of just 1.6 mm,revealing an excellent absorption ***,the MA mechanism of FeCoNiAl is comprehensively investigated via off-axis ***,the electromagnetic properties,antioxidant properties,and residual magnetism at high temperatures of FeCoNiAl alloys are summarized in detail,providing new insights into the preparation of MAM operating at elevated temperatures.

关键词： microwave absorption hollow structure magnetic stability multiple microwave absorption mechanism

The Ananthakrishna Model Under Non-synchronous Perturbation

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Acta Mathematicae Applicatae Sinica 2024年

作者： Yi-wen TAO sue Ann CAMPBELL Jing-li REN School of Mathematics and Statistics Zhengzhou University Department of Applied Mathematics University of Waterloo

The Ananthakrishna model, seeking to explain the Portevin-Le Chatelier effect, is studied with or without non-synchronous perturbations. For the unperturbed model, Bogdanov-Takens bifurcation and zeroHopf bifurcation are detected. For the perturbed model, rich dynamical behaviors are given by researching the Poincaré map, including solutions of different periods, quasi-periodic solutions, chaotic solutions, and ***, an augmented temperature-dependent perturbation amplitude induces a transition from non-serrated to serrated flow on the stress-time curve. Notably, on the stress-strain curve, the phenomenon of repeated yielding diminishes with an increase in the value of a temperature-dependent parameter, while it persists with an increase in the value of a temperature-independent parameter. Sensitivity analysis sheds light on the factors exerting the most significant influence on dislocation density.

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高度取向磷酸锆/环氧树脂纳米复合涂层的防腐蚀性能

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高分子材料科学与工程 2024年第4期40卷 72-78页

作者：雷凡冯民生李涛 Hung-Jue sue 李姜成都大学机械工程学院四川成都610106 Polymer Technology Center Department of Materials Science and EngineeringTexas A&M UniversityCollege StationTX 77843-3123USA 高分子材料工程国家重点实验室(四川大学)四川大学高分子研究所四川成都610065

针对金属防腐蚀的需求,采用简单的喷涂法在金属基底上制备了高度取向磷酸锆/环氧树脂纳米复合涂层。利用透射电镜和X射线衍射分析探究了复合涂层中磷酸锆纳米粒子的分散形貌,采用电化学交流阻抗谱和动电位极化曲线等测试评价了复合涂层... 详细信息

针对金属防腐蚀的需求,采用简单的喷涂法在金属基底上制备了高度取向磷酸锆/环氧树脂纳米复合涂层。利用透射电镜和X射线衍射分析探究了复合涂层中磷酸锆纳米粒子的分散形貌,采用电化学交流阻抗谱和动电位极化曲线等测试评价了复合涂层的防腐蚀性能和其作用机理。结果表明,高度取向的磷酸锆纳米粒子可有效地增加水、氧气、电解液的扩散路径,改善涂层的防腐蚀性能。此外,该绝缘涂层也可进一步阻止腐蚀介质的迁移,增加涂层电阻,显著提高环氧树脂涂层对金属基底的长期防护性能。

关键词：环氧树脂磷酸锆高度取向防腐蚀性能

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Facilitators and Constraints:Perceptions of Gender Differences on Women’s Career Advancement

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Journal of Tourism and Hospitality Management 2018年第2期6卷 61-72页

作者： Yan(Grace)Zhong Shane C.Blum sue couch Virginia State University(VSU) VirginiaUSA Texas Tech University(TTU) TexasUSA

The underrepresentation in top management positions has made women’s status in the hospitality industry a great *** study examined hospitality students’,educators’,and industry recruiters’perceptions of facilitators and constraints on women’s career advancement and identified if there were any significant differences among *** were collected through an online *** of gender differences of facilitators and constraints in women’s career advancement and gender issues were analyzed within the three groups(students,educators,and recruiters).Results revealed significant gender differences between male and female educators and *** findings suggested that hospitality education should make a contribution and reveal barriers and gender issues in the industry.

关键词： women in hospitality management women’s career advancement hospitality education

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视点:有关设计文档的探讨

装饰 2024年第3期 60-67页

作者： [英]苏·布雷克尔汪芸布莱顿大学设计档案馆《装饰》

如今,档案比以往任何时候都更加引人关注,这不仅体现在艺术实践和理论话语中,而且反映在流行文化中。现在,任何较新但已经被保留的内容皆可以被理解为存档。本文探讨了在档案概念已广为人知,但其含义却不那么确定的情况下,档案实践如何... 详细信息

如今,档案比以往任何时候都更加引人关注,这不仅体现在艺术实践和理论话语中,而且反映在流行文化中。现在,任何较新但已经被保留的内容皆可以被理解为存档。本文探讨了在档案概念已广为人知,但其含义却不那么确定的情况下,档案实践如何进一步融入当前的艺术史、理论和实践话语之中。

关键词：设计文档实践和理论艺术史理论和实践

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基于角频率暂态前馈的VSG控制策略

电工电能新技术 2024年第5期43卷 38-49页

作者：王素娥刘煜帆郝鹏飞陈景文陕西科技大学电气与控制工程学院陕西西安710021

针对虚拟同步发电机(VSG)并网时,输出功率的稳态性能与动态性能之间存在耦合,无法同时满足抑制有功振荡和电网一次调频的需求,提出基于角频率暂态前馈的控制策略,通过补偿输出功率,减小Δω,进而减小振荡过程。该控制策略可以有效抑制... 详细信息

针对虚拟同步发电机(VSG)并网时,输出功率的稳态性能与动态性能之间存在耦合,无法同时满足抑制有功振荡和电网一次调频的需求,提出基于角频率暂态前馈的控制策略,通过补偿输出功率,减小Δω,进而减小振荡过程。该控制策略可以有效抑制有功振荡,并且实现了稳态性能与动态性能间的解耦,不会影响一次调频特性,同时提高了响应速度。首先建立VSG有功闭环小信号模型,分析了输出功率稳态性能与动态性能之间的矛盾,并根据同步发电机功角特性分析了有功振荡机理;在此基础上提出了基于角频率暂态前馈的控制策略,利用闭环零极点与Bode图分析了所提控制策略对系统的影响;最后通过仿真和RT-LAB半实物平台验证了所提控制策略的可行性与优越性。

关键词：虚拟同步发电机有功振荡功角特性角频率暂态前馈性能解耦

Theory of Critical Phenomena with Memory

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Chinese Physics Letters 2022年第12期39卷 1-7页

作者： Shaolong Zeng sue Ping Szeto Fan Zhong State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-Sen UniversityGuangzhou 510275China

Memory is a ubiquitous characteristic of complex systems,and critical phenomena are one of the most intriguing phenomena in ***,we propose an Ising model with memory,develop a corresponding theory of critical phenomena with memory for complex systems,and discover a series of surprising novel *** show that a naive theory of a usual Hamiltonian with a direct inclusion of a power-law decaying long-range temporal interaction violates radically a hyperscaling law for all spatial dimensions even at and below the upper critical *** entails both indispensable consideration of the Hamiltonian for dynamics,rather than the usual practice of just focusing on the corresponding dynamic Lagrangian alone,and transformations that result in a correct theory in which space and time are inextricably interwoven,leading to an effective spatial dimension that repairs the hyperscaling *** theory gives rise to a set of novel mean-field critical exponents,which are different from the usual Landau ones,as well as new universality *** exponents are verified by numerical simulations of the Ising model with memory in two and three spatial dimensions.

关键词： critical Hamiltonian scaling

不同生长年限巴戟天蒽醌类含量差异比较及转录组学挖掘蒽醌类生物合成相关基因

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中草药 2024年第11期55卷 3845-3854页

作者：梁雪黄鼎黄雪慧黄勇张超裕王素娥田慧广西中医药大学药学院广西南宁530000

目的研究不同生长年限巴戟天Morinda officinalis根部蒽醌类化合物的含量差异及生物合成相关基因。方法采用HPLC测定1年生和6年生巴戟天根中蒽醌类化合物成分,并进行比较转录组分析,采用qRT-PCR验证基因表达结果。结果HPLC检测结果显示... 详细信息

目的研究不同生长年限巴戟天Morinda officinalis根部蒽醌类化合物的含量差异及生物合成相关基因。方法采用HPLC测定1年生和6年生巴戟天根中蒽醌类化合物成分,并进行比较转录组分析,采用qRT-PCR验证基因表达结果。结果HPLC检测结果显示在6年生根中蒽醌类物质显著增加,通过比较转录组分析,从1年生和6年生巴戟天的根中筛选到8619条差异表达基因,KEGG分析表明差异基因主要富集在各种次生代谢物的生物合成、苯丙素生物合成、泛醌和其他萜类醌生物合成等通路中。此外,共鉴定到13条蒽醌生物合成途径相关的差异表达Unigenes,其中ICS、SK、CS、DHNA-CoA synthase均在6年生根中上调表达,而DXS、DXR、DAHPS、IDH均下调表达,DHQD/SDH既有上调表达的又有下调表达的Unigenes。进一步选择6个候选基因进行qRT-PCR验证,验证结果与转录组数据一致。结论为鉴别参与巴戟天蒽醌生物合成的相关基因提供参考,为后期进一步深入研究蒽醌类生物合成的累积规律分子机制提供基础数据。

关键词：巴戟天比较转录组蒽醌类生物合成差异表达基因生长年限

Dimensional heterojunction design:The rising star of 2D bismuthbased nanostructured photocatalysts for solar-to-chemical conversion

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Nano Research 2023年第4期16卷 4310-4364页

作者： Joel Jie Foo sue-Faye Ng Wee-Jun Ong School of Energy and Chemical Engineering Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia Center of Excellence for NaNo Energy&Catalysis Technology(CONNECT) Xiamen University MalaysiaSelangor Darul Ehsan 43900Malaysia College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518057China

With the fast-pace digitalization evolution in the current generation’s lifestyle and the industry revolution,the energy demand has been ***,the two-dimensional(2D)bismuth-based nanomaterials emerged as a promising photocatalyst candidate in solar fuel conversion,not only for its exceptional light absorption capability and tunable optical properties,but it also can be synthesized into diverse variety of nanomaterials with different ranges of potential gap and band position to fulfill the potential requirement of wide range of photocatalytic ***,the weak light harvesting ability and ultrafast charge recombination has restricted its potential in commercial ***,recent researches have been focusing on tackling these issues by incorporating some modification strategies such as heteroatom doping,vacancy engineering,facet engineering,bismuth rich strategy and heterojunction ***,this review article presents the state-of-the-art modifications on 2D bismuth-based parent material,specifically on the relationship between each of the modification strategy on the electronic properties and surface chemistry in achieving boosted photocatalytic *** the view of the unique charge interaction between two semiconductors with different dimensions,we systematically discuss the rational heterostructure design from the dimensionality perspective,namely,point-to-face,line-to-face,face-to-face,and bulk-to-face in solar fuel conversion to provide inspiring insights for future interface ***,the challenges and the future research outlook in the solar-to-fuel conversion are highlighted to push forward the design of high-performance bismuth-based photocatalyst in realizing commercialscale solar-to-fuel conversion.

关键词： 2D heterojunction 2D nanomaterial CO_(2)reduction water splitting N2 fixation Z-scheme