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Effect of mechanical force on domain switching in BiFeO3 ultrathin films

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Science China(Physics,Mechanics & Astronomy) 2020年第1期63卷 93-99页

作者： ShiLu Tian Can Wang Yong Zhou Yu Feng xiaokang yao Chen Ge Meng He GuoZhen Yang KuiJuan Jin Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Ferroelectric polarization can be switched by an external applied electric field and may also be reversed by a mechanical force via flexoelectricity from the strain *** this study,we report the mechanical writing of an epitaxial BiFeO3(BFO)thin film and the combined action of an applied mechanical force and electric field on domain switching,where the mechanical force and electric field are applied using the tip of atomic force *** the applied force exceeds the threshold value,the upward polarization of the BFO thin film can be reversed by pure mechanical force via flexoelectricity;when an electric field is simultaneously applied,the mechanical force can reduce the coercive electric field because both the piezoelectricity from the homogeneous strain and the flexoelectricity from strain gradient contribute to the internal electric field in the *** mechanically switched domains exhibit a slightly lower surface potential when compared with that exhibited by the electrically switched domains due to no charge injection in the mechanical ***,both the mechanically and electrically switched domains exhibit a tunneling electroresistance in the BFO ferroelectric tunnel junction.

关键词： BFO flexoelectricity mechanical writing ferroelectric domain reversal

Dynamic room-temperature phosphorescence by reversible transformation of photo-induced free radicals

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Science China Chemistry 2022年第8期65卷 1538-1543页

作者： xiaokang yao Huifang Shi Xiao Wang He Wang Qiuying Li Yuxin Li Jian Liang Jingjie Li Yixiao He Huili Ma Wei Huang Zhongfu An Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts&TelecommunicationsNanjing 210023China

Room-temperature phosphorescence(RTP)with a dynamic feature endows organic luminescent materials with promising application in optoelectronic ***,it remains a formidable challenge to obtain dynamic RTP ***,we reported a strategy for dynamic RTP via reversible transformation of radicals under external *** gradually disappeared with continuous UV-light irradiation owing to the conversion of NDIA to NDIA^(·-)in NDIA/PVA film,which can be recovered by oxidation with *** the excellent reversibility and repeatability,the potential applications for round-the-clock anticounterfeiting and tag were first *** finding not only outlines a principle to synthesize new RTP materials with dynamic behavior,but also expands the scope of applications of dynamic RTP materials.

关键词： room-temperature phosphorescence radical emission supramolecular self-assembly anti-counterfeiting

Halogenated Thermally Activated Delayed Fluorescence Materials for Efficient Scintillation

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Research 2023年第4期2023卷 391-398页

作者： Xiao Wang Guowei Niu Zixing Zhou Zhicheng Song Ke Qin xiaokang yao Zhijian Yang Xiaoze Wang He Wang Zhuang Liu Chengzhu Yin Huili Ma Kang Shen Huifang Shi Jun Yin Qiushui Chen Zhongfu An Wei Huang The Institute of Flexible Electronics(IFE Future Technologies)Xiamen UniversityXiamen 361005China Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing 211816China MOE Key Laboratory for Analytical Science of Food Safety and Biology State Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou 350108China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing 210023China Department of Applied Physics The Hong Kong Polytechnic UniversityKowloon 999077 Hong KongChina

Organic scintillators,materials with the ability to exhibit luminescence when exposed to X-rays,have aroused increasing interest in recent ***,the enhancement of radioluminescence and improving X-ray absorption of organic scintillators lie in the inherent dilemma,due to the waste of triplet excitons and weak X-ray absorption during ***,we employ halogenated thermally activated delayed fluorescence materials to improve the triplet exciton utilization and X-ray absorption simultaneously,generating efficient scintillation with a low detection limit,which is one order of magnitude lower than the dosage for X-ray medical *** experimental study and theoretical calculation,we reveal the positive role of X-ray absorption,quantum yields of prompt fluorescence,and intersystem crossing in promoting the radioluminescence *** finding offers an opportunity to design diverse types of organic scintillators and expands the applications of thermally activated delayed fluorescence.

关键词： luminescence absorption Fluorescence

基于双通道参考技术的磁共振地下水探测电磁噪声分布规律研究

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地球物理学报 2021年第1期64卷 355-362页

作者：林婷婷于思佳么晓康韦萌张扬吉林大学仪器科学与电气工程学院/地球信息探测仪器教育部重点实验室长春130026

磁共振地下水探测(MRS)技术能直接测量水中氢质子的拉莫尔进动,可表征地下水含水量和介质孔隙度等信息,因而获得了广泛应用.然而,MRS信号微弱,实际探测中电磁噪声强度大,若噪声未被有效去除,会导致后续水文参数解释不准确,采用“8”字... 详细信息

磁共振地下水探测(MRS)技术能直接测量水中氢质子的拉莫尔进动,可表征地下水含水量和介质孔隙度等信息,因而获得了广泛应用.然而,MRS信号微弱,实际探测中电磁噪声强度大,若噪声未被有效去除,会导致后续水文参数解释不准确,采用“8”字形线圈或运用带参考线圈的噪声抵消等方法可抑制噪声干扰,但这些方法消噪效果的好坏取决于电磁噪声的空间分布.另外,在强噪声或多噪声源环境下应用MRS方法,选择恰当的探测位置对提高探测效率以及增加探测结果的有效性具有重要意义.因此,本文使用双通道噪声采集装置在实验前记录环境中的电磁噪声,通过双通道参考技术推导同一时刻不同测点的噪声强度,再得到测区电磁噪声分布结果,该噪声分布情况对MRS方法探测方式的选取具有指导性的作用.同时,可根据噪声分布情况为探测线圈选择最佳测点以避开噪声强度大的区域,进而提高采集信号的信噪比.最后,通过采集室外环境下的电磁噪声,验证本文提出的基于双通道参考技术的电磁噪声分布规律研究方法的有效性,为可靠高效地开展磁共振地下水探测提供了新的技术手段.

关键词：磁共振探测双通道参考技术噪声分布水文地球物理

钨矿井下破损高压导线对WSN节点电磁干扰机理的建模分析

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金属矿山 2016年第4期45卷 106-109页

作者：樊宽刚辛鹏武么晓康石明珠江西理工大学机电工程学院江西赣州341000 北京大学深圳研究生院信息工程学院广东深圳518055 山东农业工程学院信息科学与工程系山东济南250100

钨矿输电高压导线遍及整个巷道,常发生电晕和火花放电,由此带来的电磁辐射对无线传感器网络节点造成严重干扰。为此,对钨矿高压导线进行辐射场强建模仿真计算,结果证明,降低干扰后温度数据的错误率由25%下降到10.4%,建立的矿井模型和电... 详细信息

钨矿输电高压导线遍及整个巷道,常发生电晕和火花放电,由此带来的电磁辐射对无线传感器网络节点造成严重干扰。为此,对钨矿高压导线进行辐射场强建模仿真计算,结果证明,降低干扰后温度数据的错误率由25%下降到10.4%,建立的矿井模型和电磁辐射仿真结果能够很好地反映实际运行状态,对实际应用中传感器节点的布置和高压导线的布线具有很强的理论指导意义。

关键词：电磁干扰高压导线无线传感器网络节点建模仿真

一个拟合地质样品复杂穆斯堡尔谱的计算机程序

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岩石矿物学杂志 1987年第3期 246-252页

作者：蒋永才姚小康南京地质矿产研究所江苏省计算技术研究所

本文叙述了一个适合于地质样品复杂穆斯堡尔谱的计算机程序。它用FORTRAN-Ⅳ语言编写,并有一些约束条件可供选用。在CROMEMCO-Ⅲ微型计算机系统上使用本程序曾处理了一般常见地质样品的穆斯堡尔谱数据,如:钛铁矿、辉石、绿辉石、角闪石... 详细信息

本文叙述了一个适合于地质样品复杂穆斯堡尔谱的计算机程序。它用FORTRAN-Ⅳ语言编写,并有一些约束条件可供选用。在CROMEMCO-Ⅲ微型计算机系统上使用本程序曾处理了一般常见地质样品的穆斯堡尔谱数据,如:钛铁矿、辉石、绿辉石、角闪石、蓝铁矿、十字石、海绿石、黑云母、赤铁矿、磁铁矿及磁黄铁矿等,均取得了良好的结果。

关键词：穆斯堡尔谱计算机程序拟合钛铁矿绿辉石

某医学院校学分制下医学生学风状况调查与对策分析

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中国高等医学教育 2017年第6期 3-4页

作者：胡笑甜姚小康徐卫琼赵飞昆明医科大学云南昆明650500 云南省第一人民医院云南昆明650031

目的:了解该校实施学分制的效果,分析在学风建设中存在的问题、产生的原因,并以此来提出解决问题的对策。方法:随机抽取110名学生进行问卷调查。结果:该校医学生的学习目标缺乏,学习动力不足,学习纪律观念弱,自主学习能力较差。对策:在... 详细信息

目的:了解该校实施学分制的效果,分析在学风建设中存在的问题、产生的原因,并以此来提出解决问题的对策。方法:随机抽取110名学生进行问卷调查。结果:该校医学生的学习目标缺乏,学习动力不足,学习纪律观念弱,自主学习能力较差。对策:在培养的过程中,学校应通过提高教师素质,科学管理、专业思想教育等办法,来加强医学院校的学风建设。

关键词：医学生学风学分制

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大型高炉热风炉系统设备运行控制之探索

冶金动力 2017年第3期 1-5,8页

作者：齐立东李景超姚小康宋云山北京首钢股份有限公司河北迁安064404

通过对首钢股份公司三高炉2#热风炉改造的实践案例,介绍了大型高炉热风炉系统在运行中出现的设备问题,分析并确定了问题原因,采取了有针对性的措施加以控制,确保了热风炉系统的稳定运行,总结了在热风炉问题处理时应该注意的事项,为大型... 详细信息

通过对首钢股份公司三高炉2#热风炉改造的实践案例,介绍了大型高炉热风炉系统在运行中出现的设备问题,分析并确定了问题原因,采取了有针对性的措施加以控制,确保了热风炉系统的稳定运行,总结了在热风炉问题处理时应该注意的事项,为大型高炉热风炉系统设备运行控制提供了参考依据。

关键词：大型高炉热风炉系统设备运行控制

Effect of Interface Friction on Overlapping Sheets Bulging Formability and Microstructure of 5A02 Aluminum Alloy

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Journal of Wuhan University of Technology(Materials Science) 2019年第4期34卷 919-924页

作者： GAO Tiejun yao Yongjie WANG xiaokang SHAO Ruowei Faculty of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China Chengdu Aircraft Industrial(Group)Co.Ltd. Chengdu 610092China

Aluminum alloy 5 A02 with low plasticity was used as target sheet, and stainless steel SUS304 with good plasticity was used as overlapping sheet to investigate the effect of interface friction on bulging formability and microstructure of target sheet in overlapping sheets bulging process. Sheet sliding experiment was performed to measure interface friction coefficient of 5 A02/SUS304 in different lubricating conditions and normal pressure. Overlapping sheets bulging experiment of 5 A02/SUS304 was carried out to investigate the influence of interface friction on limit bulging height, wall thickness distribution, microstructure and fracture morphology of 5 A02 bulging specimens. The results showed that increase of the interface friction coefficient of 5 A02/SUS304 could effectively improve the limit bulging height and deformation uniformity of 5 A02. And the fracture style of 5 A02 transformed from toughness fracture of dimples-micropores gathered to fault slip separation fracture. Therefore, target sheet bulging formability is improved with the increase of interface friction coefficient.

关键词： overlapping sheets forming friction coefficient formability microstructure