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PVDF/6H-SiC composite fiber films with enhanced piezoelectric performance by interfacial engineering for diversified applications

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Journal of Materials Science & Technology 2024年第3期170卷 238-245页

作者： Linlin Zhou Tao Yang Chunyu Guo Kang Wang Enhui Wang Laipan Zhu Hailong Wang Sheng Cao Kuo-Chih Chou xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China

Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential applications.However,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications.Here,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light sensors.The open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF films.The effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis.The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli.This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.

关键词： 6H-SiC PVDF Multifunctional composite fiber film Energy harvester Stress/temperature/light sensor

Chinese TV Dramas Shine in World

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China News Release 2024年第3期 70-73页

作者： Zhu xinmei 不详

The past decade saw China’s annual export of TV dramas make up more than 70% of the total export of the audiovisual programs produced in China,and they have been exported to 200-plus countries and regions.This makes ... 详细信息

关键词： exported World programs

Energy storage optimization of ferroelectric ceramics during phase-transition process of amorphous/nanocrystalline and polycrystalline by using a phaseffeld model for dielectric breakdown

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Journal of Advanced Dielectrics 2024年第1期14卷 33-41页

作者： Suilong Huang Jianwen Chen Zhen Su Xiucai Wang Wenbo Zhu Wenjun Chen xinmei Yu Peng Xiao School of Electronic and Information Engineering Foshan University Foshan 528000P.R.China School of Mechatronic Engineering and Automation Foshan University Foshan 528000P.R.China China-Australia Institute for Advanced Materials and Manufacturing Jiaxing University Jiaxing 314001P.R.China School of Materials Science and Hydrogen Energy Foshan University Foshan 528000P.R.China School of Physics and Optoelectronic Engineering Foshan University Foshan 528000P.R.China

Ferroelectric ceramics have the potential to be widely applied in the modern industry and military power systems due to their ultrafast charging/discharging speed and high energy density.Considering the structural design and electrical properties of ferroelectric capacitor,it is still a challenge to ffnd out the optimal energy storage of ferroelectric ceramics during the phase-transition process of amorphous/nanocrystalline and polycrystalline.In this work,a ffnite element model suitable for the multiphase ceramic system is constructed based on the phase ffeld breakdown theory.The nonlinear coupling relationship of multiple physical ffelds between multiphase ceramics was taken into account in this model.The basic structures of multiphase ceramics are generated by using the Voronoi diagram construction method.The speciffed structure of multiphase ceramics in the phase-transition process of amorphous/nanocrystalline and polycrystalline was further obtained through the grain boundary diffusion equation.The simulation results show that the multiphase ceramics have an optimal energy storage in the process of amorphous polycrystalline transformation,and the energy storage density reaches the maximum when the crystallinity is 13.96%and the volume fraction of grain is 2.08%.It provides a research plan and idea for revealing the correlation between microstructure and breakdown characteristics of multiphase ceramics.This simulation model realizes the nonlinear coupling of the multiphase ceramic mesoscopic structure and the phase ffeld breakdown.It provides a reference scheme for the structural design and performance optimization of ferroelectric ceramics.

关键词： Ferroelectric ceramics phase transition phase-field model dielectric breakdown energy storage

Lactobacillus rhamnosus MP108 alleviates ulcerative colitis in mice by enhancing the intestinal barrier， inhibiting inflammation， and modulating gut microbiota

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Food Science and Human Wellness 2024年

作者： Huizhen Li Yang Chen Huiting Fang xinmei Guo Xuecong Liu Jianxin Zhao Wei Chen Bo Yang State Key Laboratory of Food Science and Resources Jiangnan University School of Food Science and Technology Jiangnan University Jinqiao Biotechnology Co. Ltd. Huai'an Jiangsu China National Engineering Research Center for Functional Food Jiangnan University International Joint Research Center for Probiotics & Gut Health Jiangnan University

Ulcerative colitis (UC) is a long-term inflammatory disorder that has evolved into a worldwide challenge. The development of new therapies against UC is imperative as all current therapies for UC are flawed in some way. Thus， the present study aimed to assess the palliative effects of Lactobacillus rhamnosus MP108 on UC in mice and to explore its potential mechanisms. The results showed that L. rhamnosus MP108 ameliorated the symptoms of UC， including preventing body weight loss， DAI elevation， and colon shortening， and attenuated colonic pathological damage. L. rhamnosus MP108 dramatically increased the number of goblet cells， MUC2 level， and tight junction protein level in the colon and remarkably inhibited epithelial cell apoptosis， thereby strengthening the intestinal barrier. L. rhamnosus MP108 pronouncedly diminished pro-inflammatory cytokine levels and strikingly augmented anti-inflammatory cytokine levels， in turn suppressing inflammation. Furthermore， L. rhamnosus MP108 conspicuously boosted the proportion of short-chain fatty acids (SCFAs) producers in gut microbiota， contributing to increased levels of acetate and butyrate. Therefore， L. rhamnosus MP108 might alleviate UC via improving the intestinal barrier， inhibiting inflammation， and modulating intestinal microbiota.

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职业本科教育教学评估的四个基本问题

高教发展与评估 2024年第3期40卷 1-9,I0002页

作者：沙鑫美三江学院江苏南京210012

职业本科是本科教育的新型载体,教学评估是强化内涵的必要手段。面对职业本科教育评估研究不足、评估方案缺位状况,梳理职业本科教育的发展过程,把握稳步发展的核心要义,分析职业本科教育与应用本科教育“同类异型”关系,明确工匠精神... 详细信息

职业本科是本科教育的新型载体,教学评估是强化内涵的必要手段。面对职业本科教育评估研究不足、评估方案缺位状况,梳理职业本科教育的发展过程,把握稳步发展的核心要义,分析职业本科教育与应用本科教育“同类异型”关系,明确工匠精神的引领性、本科教育的层次性、价值取向的兼容性等类型特征,构建聚焦“学校特色、学科特点、学者特质、学生特长”的评估体系,才能促进职业本科教育稳步发展、健康发展、优质发展。

关键词：本科教学评估职业本科分类评估教学评估要素

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经腹部联合经阴道彩色多普勒超声诊断子宫肌瘤的临床价值

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临床医学研究与实践 2022年第34期7卷 142-145页

作者：王亚梅谭深杜新梅宝鸡市陈仓区妇幼保健计划生育服务中心医技科陕西宝鸡721300 宝鸡市中心医院超声医学科陕西宝鸡721008 宝鸡市第二中医医院功能科陕西宝鸡721300

目的分析经腹部联合经阴道彩色多普勒超声诊断子宫肌瘤的临床价值。方法以2018年1月至2021年1月接收的150例子宫肌瘤患者为试验组,同时选取150例子宫腺肌瘤患者为对照组,均实施经腹部与经阴道彩色多普勒超声检查,并分析诊断结果。结果... 详细信息

目的分析经腹部联合经阴道彩色多普勒超声诊断子宫肌瘤的临床价值。方法以2018年1月至2021年1月接收的150例子宫肌瘤患者为试验组,同时选取150例子宫腺肌瘤患者为对照组,均实施经腹部与经阴道彩色多普勒超声检查,并分析诊断结果。结果子宫肌瘤主要发生在阔韧带、黏膜下、肌壁间、浆膜下;经腹部联合经阴道彩色多普勒超声对子宫肌瘤的检出率高于经腹部彩色多普勒超声、经阴道彩色多普勒超声,差异具有统计学意义(P<0.05);经阴道彩色多普勒超声对子宫肌瘤的检出率高于经腹部彩色多普勒超声,差异具有统计学意义(P<0.05)。经腹部联合经阴道彩色多普勒超声诊断子宫肌瘤的灵敏度、准确度及阴性预测值高于经腹部彩色多普勒超声和经阴道彩色多普勒超声,差异具有统计学意义(P<0.05)。结论经腹部联合经阴道彩色多普勒超声在子宫肌瘤诊断中具有较高的应用价值,可提高诊断效能,值得临床推广应用。

关键词：经腹部彩色多普勒超声经阴道彩色多普勒超声子宫肌瘤

Prophylactic treatment of Lacticaseibacillus paracasei K56 ameliorates asthma by regulating short-chain fatty acid production and Treg differentiation

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Food Science and Human Wellness 2024年

作者： Jiaqi Cui Yanfei Hong Wei-Hsien Liu Wen Zhao xinmei Nan Xuekai Shang Yalan Li Haotian Feng Qiuyue Jiang Weilian Hung Guiying Peng Inner Mongolia Yili Industrial Group Co. Ltd. Department of Immunology and Microbiology School of Life Sciences Beijing University of Chinese Medicine

Many studies have shown that the development of allergic asthma is associated with intestinal microbiota dysbiosis. Based on the gut-lung axis theory， probiotic intervention may be a potential strategy for respiratory diseases. Lacticaseibacillus paracasei K56 was reported to regulate gut microbiota in mice. However， its effect on allergic asthma has not been reported. In this study， we investigated the effect of the K56 on ovalbumin-induced asthma and its possible mechanisms. Our results showed that K56 reduced asthma symptoms and inflammatory cell infiltration in the lung of asthmatic mice. And K56 regulated the differentiation of helper T cells in the lung and intestine. Results from 16S rRNA gene sequencing showed that K56 prophylaxis significantly elevated the richness of Akkermansia and Burkholderia. Meanwhile， K56 abrogated the decrease in the levels of short-chain fatty acids (SCFAs) in the feces. In addition， a rebound in the mRNA expression of the SCFA receptors was observed after K56 prophylaxis. Notably， the regulatory T cell (Treg) frequencies and the FFAR3 levels were positively correlated. These results suggest that K56 could attenuate asthma， possibly by modulating the intestinal microbiota and regulating Treg differentiation through SCFA metabolized. Our study showed that K56 may be used as a probiotic to prevent pulmonary inflammation and dysbiosis of the intestinal microbiota in allergic asthma.

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电刷镀Ag-Bi合金镀层的结构与耐蚀性能研究

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表面技术 2024年第4期53卷 110-116,183页

作者：杜宝帅闫芝成张忠文张都清索帅李新梅国网山东省电力公司电力科学研究院济南250002

目的采用电刷镀技术制备Ag-Bi合金镀层,揭示镀层的微观结构特征与耐腐蚀性能。方法基于酸性硫代硫酸钠无氰镀液体系,利用电刷镀技术在铜基体上制备了纯银以及Ag-Bi合金镀层。利用XRD和SEM分析了镀层的物相组成和微观形貌,采用显微硬度... 详细信息

目的采用电刷镀技术制备Ag-Bi合金镀层,揭示镀层的微观结构特征与耐腐蚀性能。方法基于酸性硫代硫酸钠无氰镀液体系,利用电刷镀技术在铜基体上制备了纯银以及Ag-Bi合金镀层。利用XRD和SEM分析了镀层的物相组成和微观形貌,采用显微硬度计测试了镀层的硬度,通过极化曲线和电化学阻抗谱对镀层的耐腐蚀能力进行了表征。结果电刷镀制备的合金镀层均由面心立方结构Ag(Bi)过饱和固溶体组成,在Ag-15.64Bi合金镀层中还形成了六方结构α-Bi相。所制备的镀层具有纳米级晶粒尺寸,范围为13.5~21nm。与纯Ag镀层相比,电刷镀Ag-Bi合金镀层的致密性和平整度明显提高。合金镀层的硬度随着Bi含量的增加而增加,最高为220.7HV。镀层的自腐蚀电位和电荷转移电阻随着Bi含量的增加先增加后减小,腐蚀电流密度呈现相反趋势,Ag-4.52Bi镀层具有最佳的耐腐蚀能力,其自腐蚀电位为-0.189 V,腐蚀电流密度为1.76×10^(-2) mA·cm^(-2),电荷转移电阻为1635Ω·cm^(2)。结论通过在酸性硫代硫酸钠镀液中加入硝酸铋,可以电刷镀制备Ag-Bi合金镀层。Bi元素含量对镀层的显微硬度和耐腐蚀能力均具有显著影响。随着镀层中Bi元素的增加,固溶强化、细晶强化效应使镀层的硬度明显增加。合金镀层中孔隙和缝隙等结构缺陷的减少阻碍了腐蚀介质的渗入,Bi元素对镀层钝化膜的形成具有促进作用,最终使镀层的耐腐蚀性能得到提升。

关键词：电刷镀 Ag-Bi镀层耐蚀性显微硬度

“合同构成”视角下第三人原因违约的理解与突破——以《民法典(合同编)》第593条为中心

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中共南京市委党校学报 2020年第5期 89-98页

作者：杜新梅中南财经政法大学法学院 430073

既有解释路径多通过限制第三人范围及原因的方式,达到合理限制债务人责任范围的目的。能否将思维不限于"第三人",实为必要的解释路径转换方式,第三人原因违约触及的是合同债权拘束力问题,以传统归责原则作为理论分析工具,无法解决《民法... 详细信息

既有解释路径多通过限制第三人范围及原因的方式,达到合理限制债务人责任范围的目的。能否将思维不限于"第三人",实为必要的解释路径转换方式,第三人原因违约触及的是合同债权拘束力问题,以传统归责原则作为理论分析工具,无法解决《民法典(合同编)》第593条根本症结。在履行障碍法上,"合同构成"理论以救济进路代替传统的原因进路,履行请求权不再是先验的存在,而是与损害赔偿请求权一样,成为合同债权的救济手段。《民法典(合同编)》第593条作为总则中关于第三人原因违约的风险分配规范,在一定程度上可弥补现行合同法风险分配规范的缺漏。司法实践中,债务人自身违约与第三人原因违约的复合不容忽视。可预见性规则作为一个多向度的复合构成,将责任限制于正常人可合理预见的风险范围,整体性地来完成责任限制的任务。

关键词：第三人原因违约合同构成风险分配可预见性