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Enhanced High-Temperature Energy Storage Performance of All-Organic Composite Dielectric via Constructing Fiber-Re in forced Structure

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Energy & Environmental Materials 2024年第2期7卷 299-307页

作者： mengjia feng Yu feng Changhai Zhang Tiandong Zhang Xu Tong Qiang Gao Qingguo Chen Qingguo Chi Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbin 150080China

Optimizing the high-temperature energy storage characteristics of energy storage dielectrics is of great significance for the development of pulsed power devices and power control *** a polymer with a higher glass transition temperature(T_(g))as the matrix is one of the effective ways to increase the upper limit of the polymer operating ***,current high-T_(g)polymers have limitations,and it is difficult to meet the demand for high-temperature energy storage dielectrics with only one *** example,polyetherimide has high-energy storage efficiency,but low breakdown strength at high *** has high corona resistance,but low high-temperature energy storage *** this work,combining the advantages of two polymer,a novel high-T_(g)polymer fiber-reinforced microstructure is *** is designed as extremely fine fibers distributed in the composite dielectric,which will facilitate the reduction of high-temperature conductivity loss for *** the same time,due to the high-temperature resistance and corona resistance of polyimide,the high-temperature breakdown strength of the composite dielectric is *** the polyimide content with the best high-temperature energy storage characteristics is determined,molecular semiconductors(ITIC)are blended into the polyimide fibers to further improve the high-temperature ***,excellent high-temperature energy storage properties are *** 0.25 vol%ITIC-polyimide/polyetherimide composite exhibits high-energy density and high discharge efficiency at 150℃(2.9 J cm^(-3),90%)and 180℃(2.16 J cm^(-3),90%).This work provides a scalable design idea for high-performance all-organic high-temperature energy storage dielectrics.

关键词： all-organic energy storage density high-temperature high-temperature breakdown strength

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Effect of nucleating agents on the electrical properties of cross-linked polyethylene under tensile stress

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High Voltage 2024年第2期9卷 429-439页

作者： Yunqi Xing Jiahao Liu Jingang Su Junwei Zha Guochang Li Ze Guo Xiaozhen Zhao mengjia feng State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjinChina Electric Power Research Institute of State Grid Hebei Electric Power Supply Co. Ltd.ShijiazhuangChina Beijing Advanced Innovation Center for Materials Genome Engineering School of Chemistry and Biological EngineeringUniversity of Science&Technology BeijingBeijingChina Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdaoChina

During the operation of high-voltage cables,external stress and residual stress can affect the aggregated structure of insulating materials and lead to significant deterioration in their electrical *** investigate the evolution characteristics of the electrical properties of cross-linked polyethylene(XLPE)under mechanical stress,this paper ex-plains the relationship between the aggregated structure of XLPE and its electrical properties and proposes a method for improving insulation performance under me-chanical *** results show that metallocene polyethylene used as a nucleating agent can promote crystallisation through heterogeneous nucleation and increase Young's modulus by non-uniform nucleation,increasing crystallinity and reducing interplanar spacing,resulting in more complete crystal forms and reduced damage to the aggregated structure during the tensile *** nucleating agent modification,the XLPE crystallisation becomes more uniform,and interfacial adhesion forces *** weakened interface damage process between the amorphous and crystalline regions under tensile stress effectively inhibits the process of molecular chain polarisation turning and reduces trap *** modified XLPE crystal structure shows a tendency towards densification and enhanced molecular chain interactions,which can reduce the damage to the aggregated structure under tensile stress,while the reduced free volume inside the material and the shortened average free path of carriers can weaken the damage of high-energy electrons to molecular chains,thereby inhibiting the process of electrical tree *** results show that nucleating agents have great potential for maintaining the stable operation of XLPE cables under mechanical stress.

关键词： stress electrical damage

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一类非自治随机时滞系统的状态反馈镇定

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数学理论与应用 2020年第3期40卷 11-21页

作者：冯梦佳王辉朱全新李苗苗吴锡蒋茜泉南京信息工程大学数学与统计学院南京210044 湖南师范大学数学与统计学院长沙410081

本文讨论一类非自治随机时滞系统的状态反馈镇定问题.一方面,考虑到模型的特征(复杂非线性、随机以及非自治),本文在反步框架下设计随机时滞系统的时变反馈控制器,给出相应的状态反馈控制策略;另一方面,基于随机Razumikhin稳定性理论来... 详细信息

本文讨论一类非自治随机时滞系统的状态反馈镇定问题.一方面,考虑到模型的特征(复杂非线性、随机以及非自治),本文在反步框架下设计随机时滞系统的时变反馈控制器,给出相应的状态反馈控制策略;另一方面,基于随机Razumikhin稳定性理论来分析系统的依概率全局渐近稳定性,放宽了系统镇定对时滞项的要求.最后,利用数值仿真验证了反馈控制器及控制策略的有效性.

关键词：随机非自治系统时滞反步法 Razumikhin方法状态反馈

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2019-2022年上海市杨浦区视力残疾病因调查

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国际眼科杂志 2024年第8期24卷 1341-1344页

作者：冯建秀陈潞王佳朱希倩孙祖贤张梦佳王宏冯彦清姜敏敏中国上海市杨浦区眼病防治所、上海市杨浦区控江医院 200093

目的:分析2019-2022年上海市杨浦区视力残疾患者致盲和低视力的原因。方法:采用横断面研究方法,选取2019-04/2022-12于上海市杨浦区控江医院参加视力残疾评定的患者1604例为研究对象,由经过培训的医生确定视力残疾的等级和主要致盲和低... 详细信息

目的:分析2019-2022年上海市杨浦区视力残疾患者致盲和低视力的原因。方法:采用横断面研究方法,选取2019-04/2022-12于上海市杨浦区控江医院参加视力残疾评定的患者1604例为研究对象,由经过培训的医生确定视力残疾的等级和主要致盲和低视力的原因。结果:共鉴定出视力残疾患者804例,60岁及以上者占87.31%。致残病因依次为高度近视性视网膜病变(30.47%)、年龄相关性黄斑变性(23.26%)、青光眼(17.04%)和糖尿病视网膜病变(11.07%)。青光眼(36.96%)是首位致盲病因。结论:视力残疾患者以60岁及以上老年人为主,应多关注老年人,针对不同眼部疾病采取分级分类的综合防治和康复手段,早发现、早干预,减少视力残疾的发生。

关键词：视力残疾盲低视力老年人高度近视青光眼

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Epidemiological characteristics and disease burden of infectious mononucleosis in hospitalized children in China:A nationwide retrospective study

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Virologica Sinica 2022年第5期37卷 637-645页

作者： mengjia Liu Xinyu Wang Linlin Zhang Guoshuang feng Yueping Zeng Ran Wang Zhengde Xie Beijing Key Laboratory of Pediatric Respiratory Infectious Diseases Key Laboratory of Major Diseases in ChildrenMinistry of EducationNational Clinical Research Center for Respiratory DiseasesLaboratory of Infection and VirologyBeijing Pediatric Research InstituteBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing100045China Research Unit of Critical Infection in Children 2019RU016Chinese Academy of Medical SciencesBeijingChina Big Data Center Beijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing100045China Medical Record Management Office Beijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing100045China

Epstein-Barr virus(EBV)is very common,with the infection rate in adults over 90%*** mononucleosis(IM)is caused by primary infection with *** IM patients are generally considered to have a favorable prognosis,but a few patients will also develop *** with severe symptoms will require ***,the disease burden of children hospitalized with IM in China has been rarely *** this study,we included the Face sheets of discharge medical records from 27 member children's hospitals of Futang Research Center of Pediatric Development from Jan 1st,2016 to Dec 31st,2020,and medical information such as gender,age,region,time of admission,length of stay and expenditure were *** were 24,120 IM cases,which accounted for 0.42%(24,120/5,693,262)of all hospitalized cases during this *** ratio of male to female was 1.48:*** for IM in the 4-6 years age group was the highest among inpatients of all age *** numbers increased year by year between 2016 and 2020,and the monthly hospitalization was generally high from Jul to Sep but reduced from Jan to Feb per ***/pneumonia and hepatic dysfunction were two common complications in hospitalized IM *** median length of stay was 8 days,and the median cost of hospitalization was 970.59 US *** study will help understand the epidemiological characteristics and disease burden of hospitalized children with IM in China.

关键词： Epstein-Barr virus(EBV) Infectious mononucleosis(IM) Children Epidemiological characteristics Disease burden

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Rock Climbing‑Inspired Electrohydrodynamic Cryoprinting of Micropatterned Porous Fiber Scaffolds with Improved MSC Therapy for Wound Healing

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Advanced Fiber Materials 2023年第1期5卷 312-326页

作者： Jinjian Huang Jie Wu Jiahang Wang mengjia Xu Jiao Jiao Yuhao Qiang feng Zhang Zongan Li Research Institute of General Surgery Jinling HospitalSchool of MedicineSoutheast UniversityNanjing 210009China Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing NARI School of Electrical and Automation EngineeringNanjing Normal UniversityNanjing 210042China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridge 02139USA

Impaired wound healing imposes great health risks to ***,mesenchymal stem cell(MSC)therapy has shown potential to improve the healing process,but approaches to employ MSCs in the treatment of wounds remain *** this study,we reported a novel electrohydrodynamic(EHD)cyroprinting method to fabricate micropatterned fiber scaffolds with polycaprolactone(PCL)dissolved in glacial acetic acid(GAC).Cyroprinting ensured the formation of a porous struc-ture of PCL fibers by preventing the evaporation of GAC,thus increasing the surface roughness parameter Ra from 11 to 130 *** to how rough rocks facilitate easy climbing,the rough surface of fibers was able to increase the adhesion of adipose-derived MSCs(AMSCs)by providing more binding sites;therefore,the cell paracrine action of secreting growth factors and chemokines was enhanced,promoting fibroblast migration and vascular endothelial cell tube *** rat models with one-centimeter wound defects,enhanced MSC therapy based on porous PCL fiber scaffolds improved wound healing by augmenting scarless collagen deposition and angiogenesis and reducing proinflammatory ***,this study offers a new and feasible strategy to modulate the surface topography of polymeric scaffolds to strengthen MSC therapy for wound healing.

关键词： Electrohydrodynamic cryoprinting Porous fiber scaffolds Mesenchymal stem cell Wound healing

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Characteristics of Uranium Mineralization in Red Clastic Formations in the Southwestern Margin of the Ordos Basin

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1471-1487页

作者： ZHANG Zilong HE feng YI Longsheng FAN Honghai CAI Yuqi LIU Hongxu LIU Xinyang CHEN Hongbin JIA Cui YANG mengjia Key Laboratory of Uranium Resource Exploration and Evaluation Technology(CNNC) Beijing Research Institute of Uranium GeologyBeijing 100029China China National Uranium Corp. Beijing 100013China No.203 Research Institute of CNNC XianyangShaanxi 712000China

In the southwestern margin of the Ordos Basin,uranium mineralization is primarily hosted by predominantly oxidative red clastic formations in the Lower *** main target layers for uranium exploration are the Madongshan and Liwaxia formations of the Liupanshan Group,followed by the Jingchuan Formation of the Zhidan *** host rocks(medium-fine feldspar quartz sandstone),which are bleached to a light grayish white color,contain a minor organic matter component and *** mineralization changes from surficial infiltration or phreatic oxidation in the upper part to interlayer oxidation in the lower *** ore bodies are mostly lenticular or tabular in shape,locally shaped like crescent *** ore bodies are typically small and *** predominantly manifests as pitchblende and *** is usually short and columnar or granular in habit,whereas pitchblende occurs as an irregular colloidal covering on the surface or in fissures of ferric oxide,silicate,clay or *** uranium minerals are torbernite,uranophane,and *** associated with uranium are mainly pyrite,chalcopyrite and,to a minor extent,arsenopyrite and *** associated elements are Mo,V,Se,Co,Ni,and Mn,the host sandstone being high in Cu and ***,the red clastic formations in the southwestern margin of the Ordos Basin are characterized by’five multiples but one low’which means multiple target layers,multiple stages of mineralization,multiple ore body shapes,multiple kinds of uranium minerals,multiple associated elements,but low organic *** implies an overall complex uranium metallogenic environment and mineralization *** is recommended that future uranium exploration should take into consideration regional metallogenic conditions and mineralization features,with target layers in the wide-smooth synclinal slope being focused *** uranium deposits are small to medium in size,and the main type of urani

关键词： red clastic formation uranium mineralization Lower Cretaceous southwestern Ordos Basin

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A[Th_(8)Co_(8)]Nanocage-Based Metal–Organic Framework with Extremely Narrow Window but Flexible Nature Enabling Dual-Sieving Effect for Both Isotope and Isomer Separation

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CCS Chemistry 2022年第3期4卷 1016-1027页

作者： mengjia Yin Rajamani Krishna Wenjing Wang Daqiang Yuan Yaling Fan Xuefeng feng Li Wang feng Luo School of Chemistry Biology and Materials ScienceEast China University of TechnologyNanchang 330013 Van’t Hoff Institute for Molecular Sciences University of Amsterdam1098 XH Amsterdam State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002

The synthesis of nanoporous materials that display a combination of molecular sieving(MS)and quantum sieving(QS)effects is still a challenging *** this work,we have demonstrated the synthesis of a nanocaged metal–organic framework(MOF),ECUT-8,that has a dual-sieving ***-8 afforded H_(2)/D_(2) isotope separation due to its extremely narrow window size(3.0Å),resulting in ***,the framework flexibility of ECUT-8 was exploited for the separation of butane and hexane isomers due to its MS *** desirable features of ECUT-8 include high thermal,water,and chemical stability,making it suitable for practical ***,these results open up an avenue to design the effects of coexistence of multiple sieving in one material.

关键词： metal-organic framework molecular sieving effect quantum sieving effect gate-opening multiple sieving effects isotope separation isomer separation thorium-based cage

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Preparation of Gallic Acid-chitosan Copolymer and Its Antibacterial Activity against Staphylococcus Aureus and Escherichia Coli

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Journal of Wuhan University of Technology(Materials Science) 2021年第6期36卷 934-941页

作者： YAN Chunchao XIAO feng QIU Tong ZHANG Xueqiong ZHAN Siwen LU Mengli YANG mengjia ZHANG Juan College of Pharmacy Hubei University of Chinese MedicineWuhan 430065China Department of Pharmacy Hubei Provincial Hospital of Traditional Chinese MedicineWuhan 430060China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China Maternal and Child Health Hospital of Hubei Wuhan 430070China

To synthesize three different grafting ratios of gallic acid(GA)-chitosan(CS)copolymer by a free radical mediated grafting method,which is further applied to the field of antibacterial materials,crosslinking structures of the compound GA-CS copolymer were characterized,fully indicating that gallic acid is resoundingly grafted onto *** grafting ratios of three copolymers GA-CS are 45.71%(Ⅰ),36.12%(Ⅱ),and 18.96%(Ⅲ)were determined by UV-Vis *** minimum inhibitory concentrations of three GA-CS copolymers are 30μg/mL against Escherichia coli and are ranged from 250 to 550μg/mL against Staphylococcus *** counting viable bacterial colonies,it can be found that antibacterial property is preferable by increasing the grafting ratio of GA-CS *** of investigation on aforementioned bacteria experiment indicate that the CFU/mL values of GA-CS(Ⅰ,Ⅱ,Ⅲ)are 2.04×10^(6),7.56×10^(6),1.48×10^(7) to Staphylococcus aureus,and 2.96×10^(6),1.01×10^(7),2.14×10^(7) to Escherichia coli after 12 h *** addition,the interaction process between GA-CS copolymer and bacteria can be observed through a transmission electron *** specific manifestation is that the bacterial cell membranes are ruptured after being treated with the copolymer,which causes the cell contents to flow out,and the cell morphology is shrunk and out ofshape.

关键词： gallic acid chitosan antibacterial activity antibacterial material

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杏鲍菇多糖水提物新型护肤乳配方工艺及抗氧化功效

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香料香精化妆品 2024年第2期 120-127页

作者：崔丹丹赵旭升刘婵婵龚频王思远彭修娟冯文慧杨梦佳唐柳陕西国际商贸学院医药学院陕西西安710309 铜川矿务局中心医院药剂科陕西铜川610200 陕西科技大学食品与生物工程学院陕西西安710021

探究了以杏鲍菇多糖水提物为主要成分的护肤乳配比及功效。通过提取物的不同比例来设计配方,以质量分数0、25%、50%和75%的杏鲍菇多糖水提物添加量制备出4种具有抗氧化效果的护肤乳,并通过感官评定、耐热耐寒测试等试验,测定其理化性质... 详细信息

探究了以杏鲍菇多糖水提物为主要成分的护肤乳配比及功效。通过提取物的不同比例来设计配方,以质量分数0、25%、50%和75%的杏鲍菇多糖水提物添加量制备出4种具有抗氧化效果的护肤乳,并通过感官评定、耐热耐寒测试等试验,测定其理化性质及稳定性,同时结合DPPH自由基与超氧阴离子清除试验考察其氧化活性。结果表明4种产品均符合行业标准;由体外抗氧化试验可知,随着多糖水提物添加量的增加,护肤乳对DPPH和超氧阴离子的清除能力也增强。其中,含质量分数75%提取物的护肤乳效果最佳,皮肤水分含量增加8%,DPPH自由基和超氧阴离子能力的最大清除率分别为30.52%和51.86%。杏鲍菇多糖水提物具有良好的抗氧化效果和保湿性,可作为新型化妆品中的天然抗氧化活性物质。

关键词：杏鲍菇多糖水提物抗氧化保湿性护肤乳

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