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Journal of Semiconductors 2024年第7期45卷 46-53页

作者： Shuo Deng Mengxi Cui Jingru Jiang Chuang Wang Zengguang Cheng huajun sun Ming Xu Hao Tong Qiang He Xiangshui Miao School of Integrated Circuits Huazhong University of Science and TechnologyWuhan 430074China Hubei Yangtze Memory Laboratories Wuhan 430205China School of Microelectronics Fudan UniversityShanghai 200433China

All-dielectric metasurface, which features low optical absorptance and high resolution, is becoming a promising candidate for full-color generation. However, the optical response of current metamaterials is fixed and lacks active tuning. In this work, we demonstrate a reconfigurable and polarization-dependent active color generation technique by incorporating low-loss phase change materials(PCMs) and CaF_2 all-dielectric substrate. Based on the strong Mie resonance effect and low optical absorption structure, a transflective, full-color with high color purity and gamut value is achieved. The spectrum can be dynamically manipulated by changing either the polarization of incident light or the PCM state. High transmittance and reflectance can be simultaneously achieved by using low-loss PCMs and substrate. The novel active metasurfaces can bring new inspiration in the areas of optical encryption, anti-counterfeiting, and display technologies.

关键词： structural color reconfigurable all-dielectric metasurfaces phase change material

指向初中科学“理解”学习的表现性评价实践研究

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物理教学 2024年第6期46卷 34-38页

作者：孙华君绍兴市柯桥区鲁迅外国语学校浙江312030

“理解”是学习的过程和方式。在初中科学学习中,对学生开展指向“理解”学习的评价,可以帮助学生掌握理解学习的操作要点,开展有效的理解学习活动,提升学生科学学习的效度。文章以华东师大版《科学(七年级下册)》“透镜和视觉”一课为... 详细信息

“理解”是学习的过程和方式。在初中科学学习中,对学生开展指向“理解”学习的评价,可以帮助学生掌握理解学习的操作要点,开展有效的理解学习活动,提升学生科学学习的效度。文章以华东师大版《科学(七年级下册)》“透镜和视觉”一课为例,通过指向理解学习的表现性任务设计和表现性评价量表制作,阐述指向初中科学“理解”学习的表现性评价实施策略。

关键词：初中科学理解学习表现性评价实施研究

Robust superamphiphobic coatings with gradient and hierarchical architecture and excellent anti-flashover performances

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Nano Research 2022年第8期15卷 7565-7576页

作者： Yi Xie Wei Xiong Shefiu Kareem Chuxiong Qiu Yongfei Hu Ivan PParkin Shengwu Wang Huayun Wang Junwu Chen Lee Li Zhi Chen huajun sun Xiujian Zhao State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Chemistry University College LondonLondon WC1H 0AJUK State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science&Technology) Wuhan 430074China State Grid Jiangxi Electric Power CompanyLtd.Electric Power Research InstituteNanchang 330096China Wuhan Shuneng New Material Co. LTDWuhan 430074China

Biomimetic superhydrophobic(SH)coatings have emerged as a promising alternative to traditional room temperature vulcanizing(RTV)silicone rubber coatings for improving the flashover strength of insulators.However,organic contamination occurs in outdoor applications and thus a superamphiphobic(SAP)surface is more desirable but not yet reported for improving flashover performance.Herein,we developed a novel anti-flashover technique by fabricating robust SAP coating with unique gradient and micro-nanoscale hierarchical architecture.The SAP coating was fabricated by sequentially spray-depositing a resin-based primer and a silica-based topcoat on substrates(i.e.,glass slides and insulators).The primer not only functions as an adhesive offering strong adhesion to the substrate but also offers a micromastoid-like structure facilitating the subsequent formation of hierarchical micro-nanostructure.The appropriate spraying pressure leads to a diffusion of the fluorocarbon-modified silica nanoparticles into the primer to form a unique gradient structure,by analogy to inserting bullets into a wood.These features render the SAP coating excellent robustness with strong abrasive resistance,excellent ultraviolet(UV)resistance,and excellent chemical and thermal stability.Pollution flashover property of the SAP coating was explored and compared with that of SH and RTV specimens,from which a novel organic-contamination model to evaluate the flashover performance was proposed.The coated SAP glass insulator demonstrated 42.9%pollution flashover voltage improvement than RTV-coated insulator.These stated unique features reveal the convincing potential of the present SAP coatings to be applied for not only outdoor transmission line insulators for antiflashover but also other fields for self-cleaning,anti-fouling,and anti-icing.

关键词： superamphiphobic coatings superhydrophobic coatings insulator pollution flashover voltage anti-flashover

Significantly enhanced piezo-photocatalytic capability in BaTiO_(3) nanowires for degrading organic dye

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Journal of Materiomics 2020年第2期6卷 256-262页

作者： Xiaofang Liu Longyin Xiao Yong Zhang huajun sun School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device IntegrationSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Advanced Ceramics Institute of Zibo New&High-Tech Industrial Development Zone Zibo255000China

Over the last several years,piezo-photocatalytic effect was intensively investigated for a facile,effective and promising protocol to sewage treatment and environmental remediation.The research on the integration of piezocatalytic and photocatalytic process on lead-free ferroelectric materials is highly demanded to further push this field forward.In this work,BaTiO_(3) nanowires(BT NWs)were fabricated by a two-step hydrothermal method.The degradation of organic dye(methyl orange,MO)aqueous solution(5 mg L^(-1))by integrating photocatalysis with the piezoelectric-like effect under UV light radiation and ultrasonic vibration was investigated.The decomposition ratio reaches up to ~98.17%(at 80 min),which is around 1.28 and 2.24 times of the sole piezocatalysis and photocatalysis process,respectively.The intermediate product of hydroxyl radical(·OH)and superoxide radical(·O_(2)^(-))was detected and quantified by radical trapping experiments,to illustrating their key role in degrading MO molecules.In addition,we carried out sequential cycles to evaluate the cycling stability and usage durability of catalysts and a reduction of ~15% in the efficiency was observed after four cycles.This work provides a promising paradigm for the further development of piezo-photocatalytic materials and target applications in environmental field.

关键词： Hydrothermal BaTiO_(3) Piezo-photocatalytic Piezoelectric potential Catalysis

Construction of direct Z-scheme BPQDs-modified BiOBr thin film for enhanced photocatalytic performance under visible light irradiation

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Journal of Materiomics 2021年第5期7卷 1122-1130页

作者： Ziyu Yao huajun sun Yunlong Hu Xiaofang Liu Yong Zhang State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device IntegrationSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China Advanced Ceramics Institute of Zibo New&High-Tech Industrial Development Zone Zibo255000China

Surface modification on photocatalytic thin films is long considered as an effective strategy to improve the degradation performance,which in turn helps to alleviate the worldwide environmental pollution issue.In this study,a direct Z-scheme photocatalytic system is constructed successfully by integrating black phosphorus quantum dots(BPQDs)on the surface of BiOBr thin film prepared by hydrothermal method.The optimal BPQDs/BiOBr-1 thin film presents remarkable enhanced photocatalytic activity for degrading methyl violet(MV)and tetracycline hydrochloride(TC),which is 3 and 3.65 times higher than that of pure BiOBr counterpart.The active species involved in the reaction are ^(+),·O_(2)^(-),and·OH,which determined by radical trapping experiments.The formation of direct Z-scheme photocatalytic system makes electrons assembled in the conduction band(CB)of BPQDs and holes gathered in the valence band(VB)of BiOBr,which supports the generation of h^(+) and·O_(2)^(-) and in turn accelerates the photocatalytic reaction.Besides,the improved efficiency of charge separation,enhanced visible light absorption and enlarged specific surface area also contributed to the enhanced photocatalytic performance of BPQDs/BiOBr.This work provides a feasible strategy for optimizing photocatalytic thin films via detailed analyzing the role of BPQDs in the construction of direct Z-scheme photocatalysts.

关键词： Photocatalytic thin films Direct Z-scheme Surface modification BPQDs BiOBr

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果实采后软化机制研究进展

食品工业科技 2024年第4期45卷 371-378页

作者：钱丽丽杨斯琪李跃刘盈李雪静孙华军黑龙江八一农垦大学食品学院黑龙江大庆163319 国家杂粮工程技术研究中心黑龙江大庆163319 黑龙江省农产品加工与质量安全重点实验室黑龙江大庆163319

采后果实在经过储藏运输等一系列过程后会发生软化现象,而软化现象产生的原因有很多,例如由于细胞壁代谢相关酶活性的作用,使得细胞壁的物质成分、结构等发生改变;也可能是由于果实成熟后相关物质的变化以及受到植物激素的调控,进而促... 详细信息

采后果实在经过储藏运输等一系列过程后会发生软化现象,而软化现象产生的原因有很多,例如由于细胞壁代谢相关酶活性的作用,使得细胞壁的物质成分、结构等发生改变;也可能是由于果实成熟后相关物质的变化以及受到植物激素的调控,进而促进果实成熟软化。本文综述了采后果实软化产生的原因,包括植物激素合成以及与受体结合进而促进果实软化、相关转录因子对果实软化的调控和果实软化相关的细胞壁代谢与碳水化合物代谢等途径,以期为探究采后果实软化机制提供参考。

关键词：采后果实软化细胞壁代谢植物激素研究进展

Piezoelectric ceramics with high piezoelectricity and broad temperature usage range

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Journal of Materiomics 2021年第4期7卷 683-692页

作者： Qinghu Guo Fei Li Fangquan Xia Pengbin Wang Xiaoyi Gao Hua Hao Hanxing Liu huajun sun Shujun Zhang State Key Laboratory Silicate Materials for Architectures Center for Smart Materials and Device IntegrationSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationXi’an Jiaotong UniversityXi’an710049China School of Chemistry and Chemical Engineering University of JinanJinan250022China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNew South Wales2500Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China

There is a general observation that the Curie temperature and piezoelectric property of the ferroelectric ceramics can be enhanced only at the expense of each other,i.e.,higher piezoelectricity,lower Curie temperature,thus,limits their applications over broad temperature range.In this research,Sm-modified 0.15 Pb(Mg_(1/3)Nb_(2/3))O_(3)-(0.85-x)PbZrO_(3)-xPbTiO_(3) ceramics have been studied,where excellent piezoelectric coefficients d33¼720 pC/N,d_(33)*=950 pm/V and high Curie temperature T_(C)=293℃ were simultaneously achieved for x=0.42 composition by designing the morphotropic phase boundary(MPB)with local structural heterogeneity.Of particular significance is that a high thermal stability was observed with piezoelectric variation below 20%with temperature up to 280℃,demonstrating that the x=0.42 composition is a good candidate for piezoelectric application over broad temperature range where high temperature stability is required.This work provides a good paradigm for designing highperformance piezoelectric ceramics with high thermal stability via a combination of MPB and local structural heterogeneity.

关键词： Piezoelectric ceramics Local structural heterogeneity Electromechanical response Thermal stability

Fabrication of Ceramic-Polymer Piezo-Composites with Triply Periodic Minimal Interfaces via Digital Light Processing

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第4期2卷 3-12页

作者： Kai Liu Junchao He Tianyang Li Jiaming Hu Yanying Du Yusheng Shi Chunzhe Yan Zhangwei Chen Shangyu Huang huajun sun State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China School of Logistics Engineering Wuhan University of TechnologyWuhan430070China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan430074China Additive Manufacturing Institute Shenzhen UniversityShenzhen518060China

The geometry of the phase interface in co-continuous piezoelectric composites is critical in improving their piezo-electric properties.However,conventional co-continuous piezoelectric composites are mostly simple structures such as wood stacks or honeycombs,which are prone to stress concentrations at the joints,thus reducing the fatigue service performance and force-electric conversion efficiency of piezoelectric composites.Such simple structures limit further improvements in the overall performance of co-continuous piezoelectric composites.In this study,based on the digital light processing 3D printing method,we investigated the influence of three dif-ferent structures-the gyroid,diamond,and woodpile interfaces-on the piezoelectric and mechanical properties of co-continuous ceramic/polymer piezoelectric composites.These findings demonstrate that the gyroid and di-amond interfaces outperformed the ceramic skeleton of the woodpile interface in terms of both mechanical and electrical properties.When the ceramic volume percentage was 50%,the piezo-composite of the gyroid surface exhibited the greatest hydrostatic figure of merit(HFOM),reaching 4.23×10^(−12) Pa^(−1),and its piezoelectric coeffi-cient(d_(33))and relative dielectric constant(εr)reached 115 pC/N and 748,respectively.The research results lay the foundation for the application of co-continuous piezoelectric composites in underwater communication and detection.

关键词： Additive manufacturing Digital light processing BaTiO_(3) Triply periodic minimal surface Piezoelectric composite

The Structure and Properties of Multi-cations Doped KNN-based Piezoelectric Ceramics

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Journal of Wuhan University of Technology(Materials Science) 2023年第2期38卷 261-266页

作者： GAO Xiaoyi sun huajun HAO Hua WANG Chuanbin SHEN Qiang ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China

The piezoelectric strain of K_(0.5)Na_(0.5)NbO_(3)-based lead-free ceramic at different temperatures was studied.The Rayleigh analysis shows that the intrinsic and extrinsic contributions are increased at temperature from 173 to 298 K.In addition,a monoclinic phase structure was observed at 83 K.The results of phase field simulation show that the temperature dependent microstructure evolution is a function of the local structure size.This work contributes to understanding the structure and properties relationship of the multi-cations doped KNN-based piezoelectric ceramics as a function of temperature.

关键词： microstructure evolution phase structure monoclinic phase strain behavior

基于PICO模型的中医药循证指南知识图谱构建与智能问答系统研究

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中国数字医学 2024年第5期19卷 20-27页

作者：崔唐明孙美玲孙华君李海燕中国中医科学院中医药信息研究所北京100700

目的:基于PICO模型构建中医药循证指南知识图谱,探索以此知识图谱为知识库搭建智能问答系统,增强临床决策支持。方法:采用自上而下与自下而上相结合的方法设计知识图谱的概念层和数据层,并以多囊卵巢综合征为例,利用“文心一言”大模型... 详细信息

目的:基于PICO模型构建中医药循证指南知识图谱,探索以此知识图谱为知识库搭建智能问答系统,增强临床决策支持。方法:采用自上而下与自下而上相结合的方法设计知识图谱的概念层和数据层,并以多囊卵巢综合征为例,利用“文心一言”大模型工具进行知识抽取,抽取结果通过Neo4j图数据库进行存储,实现知识图谱的可视化展示,同时对智能问答系统进行临床专家问卷调研和框架结构设计。结果:构建了包含13种类别、248个节点、12种关系类型、337条关系以及10种数据属性的中医药循证指南知识图谱,并展示了其可视化功能和应用示例。智能问答系统部分,已根据指南临床问题范围将其分为12大类,并预设了24种问题模板,为后续问题预处理奠定了基础,并对系统实现提供了有力支撑。结论:本研究以循证指南为数据源确保了临床辅助决策系统科学性和准确性,也为中医药领域的智能化信息服务提供了新的思路和方法。

关键词： PICO 循证指南知识图谱智能问答系统大模型