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基于自适应阈值分割的动车组辅助供电系统单芯动力电缆故障定位方法研究

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铁道学报 2024年第4期46卷 80-88页

作者：王东阳胡宇鹏蒋伟辉马含青刘博凯周利军西南交通大学电气工程学院四川成都611756

单芯动力电缆是动车组辅助供电系统能量传输通道之一,其故障后准确定位对检修具有重要意义。当前,电缆故障定位使用较为广泛的方法为时频域反射法,但在对反射信号进行时频分析过程中,产生的交叉项是制约定位准确度的重要原因。为此提出... 详细信息

单芯动力电缆是动车组辅助供电系统能量传输通道之一,其故障后准确定位对检修具有重要意义。当前,电缆故障定位使用较为广泛的方法为时频域反射法,但在对反射信号进行时频分析过程中,产生的交叉项是制约定位准确度的重要原因。为此提出一种基于自适应阈值分割的Wigner-Ville变换方法:在70 m长的电缆样品中设置低阻、高阻、开路和短路四种缺陷故障样本,对时频域法检测到的信号使用Wigner-Ville变换进行时频分析,说明原始Wigner-Ville变换产生交叉项的原因,并据此提出基于自适应阈值分割的Wigner-Ville变换方法,解决交叉项干扰问题;将本文方法与当前交叉项抑制方法进行测试效果对比。结果表明:提出的基于自适应阈值分割的Wigner-Ville变换方法可以有效消除交叉项,且对于单个缺陷故障和多个缺陷的电缆均可适用;对于所设置的单个缺陷故障位置的定位误差均小于0.80%,对于双缺陷故障检测结果的定位误差小于0.40%,验证了本文方法的有效性。

关键词：电缆绝缘缺陷与故障定位时频反射法交叉项消除

Synthesis of CeO2 nanosheets with a room temperature ionic liquid assisted method

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Journal of Advanced Ceramics 2016年第2期5卷 111-116页

作者： Ting CHEN Zhixiang XIE weihui jiang Wan jiang Xiaojun ZHANG Jianmin LIU School of Material Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science & Engineering Donghua University Shanghai 201620 China

CeO2 nanosheets were directly synthesized by a precipitation process with the aid of 1-butyl-3-methyl-imidazolium ionic liquids at room temperature. The anion species and the concentration of the room temperature ionic liquids (RTILs) have a great influence on the morphology of the resulting products. The as-prepared CeO2 is irregular and agglomerated seriously in the absence of RTILs, while it changes from nanocube to nanosheet with increasing the RTIL concentration or decreasing the polarity and hydrophilicity in the orders [Bmim] Cl > [Bmim] Br > [Bmim] BF4 > [Bmim] PF6. The CeO2 nanocubes have relatively uniform grain size distribution with size of 4.5-6.4 nm, and the nanosheets are assembled by a great deal of nanocrystalline whose length and width extend to hundreds of nanometers. The as-synthesized CeO2 exhibits an excellent removal capacity for the organic pollutant Congo red dye, indicating its potential use in practical wastewater treatment.

关键词： ceria nanocrystalline ionic liquid room temperature catalysis

Partially stabilized tetragonal ZrO_(2) whiskers with preferred [001] direction derived from CaF_(2)

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Journal of Materiomics 2021年第4期7卷 879-885页

作者： Xuefeng Liu Quan Zhang Jianmin Liu Tao Wang Yanqiao Xu Jian Liang Feng jiang Guo Feng weihui jiang School of Materials Science and Engineering Jingdezhen Ceramic InstituteJingdezhen333403China National Engineering Research Center for Domestic&Building Ceramics Jingdezhen333001China

The simultaneous control of crystal phase stability and one-dimensional growth has always been the major challenge for the preparation of tetragonal zirconia *** this study,we report a facile molten salt processing that utilizes CaF_(2) as a stabilizer and adsorbent to meet the phase and morphology *** processes of stabilization,phase transition,ion adsorption and formation of special morphology involved in zirconia growth were investigated by XRD,IR,SEM,DTA-TG and *** controlling the amount of CaF_(2)(15 wt%)added in the reaction precursor,tetragonal zirconia whiskers with a desired aspect ratio(>16)can be synthesized,which show single crystalline nature and[001]preferred *** ions doped at low temperature inhibit the occurrence of phase transition,which allows the tetragonal structure to be retained to room *** inducement and pattern of whisker growth are supposed to be F-adsorption and screw dislocation elongation,*** specific selectivity of surface adsorbed ions to certain zirconia crystal planes reduces or even inhibits the epitaxial growth rate in this direction,offering a viable avenue for the morphology modulation of inorganic nanomaterials.

关键词： Tetragonal zirconia whisker Molten salt processing CaF_(2) Phase stability Ion adsorption

非水解溶胶-凝胶法制备TiO_2光催化薄膜

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硅酸盐学报 2007年第11期35卷 1508-1513页

作者：江伟辉包镇红景德镇陶瓷学院材料科学与工程学院江西景德镇333001

以TiCl_4为前驱体,无水乙醇为氯供体,聚乙二醇(polyethyleneglycol,PEG)为成膜控制剂,通过非水解溶胶-凝胶法制备了TiO_2光催化薄膜。应用X射线衍射和热重-差式扫描量热研究了TiO_2凝胶在热处理过程中的物相变化。采用场发射扫描电镜和... 详细信息

以TiCl_4为前驱体,无水乙醇为氯供体,聚乙二醇(polyethyleneglycol,PEG)为成膜控制剂,通过非水解溶胶-凝胶法制备了TiO_2光催化薄膜。应用X射线衍射和热重-差式扫描量热研究了TiO_2凝胶在热处理过程中的物相变化。采用场发射扫描电镜和光照甲基橙的降解实验研究了TiCl_4浓度和镀膜次数对TiO_2薄膜显微结构和光催化活性的影响。结果表明:非水解溶胶-凝胶法制备的TiO_2薄膜开始出现金红石相的温度为750℃,高于传统水解溶胶-凝胶法制备的薄膜。TiCl_4浓度和PEG用量是影响薄膜结构和光催化性能的关键因素。当TiCl_4浓度为0.83mol/L,PEG与TiCl_4摩尔比为0.1时,所制备的薄膜是一种晶粒细小且孔隙及孔径分布均匀的多孔膜,这有利于提高薄膜的比表面积,薄膜具有最佳的光催化性能。

关键词：四氯化钛非水解溶胶-凝胶法二氧化钛薄膜光催化

An Occupational Dimethylacetamide Poisoning Incident Responded Efficiently in Health Emergency Response Network—Zhuhai City,Guangdong Province,China,August 2023

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China CDC weekly 2024年第34期6卷 872-875页

作者： Jiaxin jiang Jian Huang Jintong He Chudong Zhang weihui Liang Qifeng Wu Weifeng Rong Xiaoyong Liu Guangdong Province Hospital for Occupational Disease Prevention and Treatment(GDHOD) Guangzhou CityGuangdong ProvinceChina The Third People’s Hospital of Zhuhai(Zhuhai Hospital for Occupational Disease Prevention and Treatment ZHHOD)Zhuhai CityGuangdong ProvinceChina

Summary What is already known about this topic?Dimethylacetamide(DMA),a colorless liquid with low toxicity,is commonly used as a solvent in the production of synthetic materials,petroleum processing,and pharmaceutical *** comparison to substances of higher toxicity,occupational exposure to DMA presents a deceptive risk due to its insidious and subacute progression,increasing the likelihood of escalating into major incidents.

关键词： Dimethyl Guangdong manufacture

聚乙二醇对非水解溶胶-凝胶法制备TiO_2薄膜结构及性能的影响(英文)

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硅酸盐学报 2008年第2期36卷 187-191页

作者：江伟辉包镇红景德镇陶瓷学院材料科学与工程学院江西景德镇333001

采用非水解溶胶-凝胶法制备了多孔TiO_2光催化薄膜。用紫外光照甲基橙的降解实验研究了聚乙二醇(polyethylene glycol,PEG)分子量和添加量对TiO_2薄膜光催化活性的影响。应用场发射扫描电镜分析了薄膜的显微结构与其光催化性能的关系。... 详细信息

采用非水解溶胶-凝胶法制备了多孔TiO_2光催化薄膜。用紫外光照甲基橙的降解实验研究了聚乙二醇(polyethylene glycol,PEG)分子量和添加量对TiO_2薄膜光催化活性的影响。应用场发射扫描电镜分析了薄膜的显微结构与其光催化性能的关系。结果表明:当PEG的相对分子量为1 000,PEG与TiCl_4的摩尔比为0.1时,薄膜的比表面积大,薄膜颗粒细小,薄膜中存在均匀分布的大量微小孔隙,其光催化性能最佳。PEG的分子量和加入量过高或过低均会降低薄膜的光催化性能。当PEG的分子量过小或其加入量过少时,TiO_2薄膜显微结构的特点是晶粒粗、孔隙数量多和孔径大。PEG的分子量过大或加入量过多,薄膜的颗粒细小,但前者导致薄膜致密而后者又促使薄膜多孔。

关键词：聚乙二醇非水解溶胶-凝胶法二氧化钛薄膜光催化

R_2O–RO–B_2O_3–SiO_2–Al_2O_3–P_2O_5–CaF_2系分相–析晶乳浊釉的形成机理

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硅酸盐学报 2006年第11期34卷 1356-1361页

作者：江伟辉廖奇丽景德镇陶瓷学院材料科学与工程学院江西景德镇333001

通过正交试验方法优化釉料组成和烧成工艺,制备了R_2O–RO–B_2O_3–SiO_2–Al_2O_3–P_2O_5–CaF_2多元系光亮无锆的分相–析晶乳浊釉。采用X射线衍射仪、透射电子显微镜/X射线能谱、场发射扫描电子显微镜等研究了釉的显微结构及分相... 详细信息

通过正交试验方法优化釉料组成和烧成工艺,制备了R_2O–RO–B_2O_3–SiO_2–Al_2O_3–P_2O_5–CaF_2多元系光亮无锆的分相–析晶乳浊釉。采用X射线衍射仪、透射电子显微镜/X射线能谱、场发射扫描电子显微镜等研究了釉的显微结构及分相与析晶的形成机理。结果表明析晶与分相结构并存,分相促进析晶;尺寸接近可见光波长的孤立液滴和所析出的钙钠长石晶体是釉面产生乳浊的根本原因。研究了不同烧成制度对分相–析晶乳浊釉显微结构的影响,发现缓冷釉样的分相液滴尺寸明显大于急冷釉样,急冷釉样中的第二相形貌表里存在明显差异,内部呈球形液滴状,表面则为蠕虫状。

关键词：分相析晶乳浊釉显微结构

SIL1 improves cognitive impairment in APP23/PS45 mice by regulating amyloid precursor protein processing and Aβ generation

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Zoological Research 2024年第4期45卷 845-856页

作者： Qunxian Wang Yanshuang jiang Zijun Meng Xiangjun Dong Dongjie Hu Liangye Ji weihui Zhou Weihong Song Chongqing Key Laboratory of Child Neurodevelopment and Cognitive Disorders Ministry of Education Key Laboratory of Child Development and DisordersNational Clinical Research Center for Child Health and DisordersChina International Science and Technology Cooperation Base of Child Development and Critical DisordersChildren's Hospital of Chongqing Medical UniversityChongqing 400000China Second Affiliated Hospital and Yuying Children’s Hospital Institute of AgingKey Laboratory of Alzheimer’s Disease of Zhejiang ProvinceWenzhou Medical UniversityWenzhouZhejiang 325000China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)WenzhouZhejiang 325001China

SIL1,an endoplasmic reticulum(ER)-resident protein,is reported to play a protective role in Alzheimer’s disease(AD).However,the effect of SIL1 on amyloid precursor protein(APP)processing remains *** this study,the role of SIL1 in APP processing was explored both in vitro and in *** the in vitro experiment,SIL1 was either overexpressed or knocked down in cells stably expressing the human Swedish mutant *** the in vivo experiment,AAV-SIL1-EGFP or AAV-EGFP was microinjected into APP23/PS45 mice and their wild-type *** blotting(WB),immunohistochemistry,RNA sequencing(RNA-seq),and behavioral experiments were performed to evaluate the relevant *** indicated that SIL1 expression decreased in APP23/PS45 *** of SIL1 significantly decreased the protein levels of APP,presenilin-1(PS1),and C-terminal fragments(CTFs)of APP in vivo and in ***,knockdown of SIL1 increased the protein levels of APP,β-site APP cleavage enzyme 1(BACE1),PS1,and CTFs,as well as APP mRNA expression in 2EB2 ***,SIL1 overexpression reduced the number of senile plaques in APP23/PS45 ***,Y-maze and Morris Water maze tests demonstrated that SIL1 overexpression improved cognitive impairment in APP23/PS45 *** findings indicate that SIL1 improves cognitive impairment in APP23/PS45 mice by inhibiting APP amyloidogenic processing and suggest that SIL1 is a potential therapeutic target for AD by modulating APP processing.

关键词： Alzheimer’s disease SIL1 APP processing Cognitive impairment

组成对分相-析晶乳浊釉显微结构及表面性质的影响

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硅酸盐学报 2007年第2期35卷 230-235页

作者：江伟辉廖奇丽景德镇陶瓷学院材料科学与工程学院江西景德镇333001

采用X射线衍射、透射电镜和扫描电镜等测试手段,研究了不同组成对分相-析晶乳浊釉显微结构及釉面性状的影响。研究表明:B2O3和P2O5能促进分相形成,并且由于分相具有很小的表面张力而使其液滴易于长大。适量引入CaO能使液滴尺寸增大,体... 详细信息

采用X射线衍射、透射电镜和扫描电镜等测试手段,研究了不同组成对分相-析晶乳浊釉显微结构及釉面性状的影响。研究表明:B2O3和P2O5能促进分相形成,并且由于分相具有很小的表面张力而使其液滴易于长大。适量引入CaO能使液滴尺寸增大,体积分数提高,但过量引入会由于析晶而使体积分数降低。控制分相液滴尺寸接近可见光波长以及使釉中析出适量钙钠长石晶体可获得最佳的乳浊效果,而液滴过大或过小都难以获得较佳的乳浊效果。

关键词：分相乳浊釉显微结构组成釉面性状