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Effect of Directional Stretching on Properties of PVA-HA-PAA Composite Hydrogel

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Journal of Bionic Engineering 2021年第5期18卷 1202-1214页

作者： Kai Chen Qin Chen Tian Zong Siyu Liu Xuehui Yang yong luo Dekun Zhang School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Department of Mechanical Engineering Purdue School of Engineering and TechnologyIUPUIIndianapolisIN 46202USA

Polyvinyl alcohol(PVA)hydrogels with excellent characteristics are considered as promising cartilage replacement materials.However,there are still some main issues to be solved for PVA hydrogel,such as poor mechanical strength and disordered structure.Inspired by the highly ordered structure of biological soft tissues such as articular cartilage,here,we prepared a high-strength but anisotropic polyvinyl alcohol-nanohydroxyapatite-polyacrylic acid(PVA-HA-PAA)composite hydrogel by directional stretching,freezing–thawing,and annealing method.Stretching of an as-prepared isotropic PVA-HA-PAA composite hydrogel leads to the orientation of PVA crystallites and PVA chains,which enables the formation of ordered structure and more hydrogen bonds via freezing under stretching.The microstructure,water content,swelling and creep performance,tensile and bio-tribology properties of the composite hydrogel are studied,the results indicated that the properties of the hydrogel are aff ected by stretching due to the formation of ordered structure in the anisotropic hydrogel.For instance,the elastic modulus and tensile strength of the anisotropic hydrogel reach 5.703 MPa and 18.958 MPa,respectively,which is significantly enhanced by comparing with isotropic hydrogel.Moreover,the friction property is anisotropic,and the Coefficient Of Friction(COF)reduced in the parallel direction.Thus,this work provides a simple and practicable strategy to design strong and anisotropic hydrogels for potential applications in biomedical materials such as cartilage substitute.

关键词： PVA-HA-PAA hydrogel Directional stretching Anisotropic Mechanical properties Friction property

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无损检测技术在陶瓷材料检测中的应用

广东建材 2024年第1期40卷 48-49页

作者：罗湧广东省建筑材料研究院有限公司

本文简述陶瓷制品的制作要求及材料制作过程中容易产生的缺陷。介绍超声检测、红外热成像检测技术在陶瓷材料检测中的应用。超声检测术适用于检测陶瓷制品生产过程中的各类缺陷;红外成像检测技术更适合工业生产自动化、大批量检测。为... 详细信息

本文简述陶瓷制品的制作要求及材料制作过程中容易产生的缺陷。介绍超声检测、红外热成像检测技术在陶瓷材料检测中的应用。超声检测术适用于检测陶瓷制品生产过程中的各类缺陷;红外成像检测技术更适合工业生产自动化、大批量检测。为今后陶瓷制品的检测及质量把控奠定了基础。

关键词：陶瓷制品超声检测红外成像检测

学习共同体:构建优良学风建设的新思路——以浙江工业大学机械工程学院为例

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绵阳师范学院学报 2024年第7期43卷 72-78页

作者：罗勇林洁浙江工业大学机械工程学院浙江杭州310023

学习共同体是新时代高校教育改革发展背景下加强优良学风建设的新思路。其内涵是通过提升理想抱负水平来提高优良学风建设,最终达到学生的全方位成长。学生在共同体验、交互的环境中,以参与、合作、交流的方式互构提升。学习共同体具有... 详细信息

学习共同体是新时代高校教育改革发展背景下加强优良学风建设的新思路。其内涵是通过提升理想抱负水平来提高优良学风建设,最终达到学生的全方位成长。学生在共同体验、交互的环境中,以参与、合作、交流的方式互构提升。学习共同体具有三重内涵特征——成长共同体、价值共同体、育人共同体。学习共同体的构建与发展得益于学生共同的价值追求、理想抱负水平的提升以及充分有效的沟通。同时,以机械工程学院为例提出学习共同体建设的实践路径与现实成效。

关键词：学习共同体学风建设理想抱负大学生

习近平文化思想的方法体系及其实践指向——基于建设中华民族现代文明的视角

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哈尔滨工业大学学报（社会科学版） 2024年第3期26卷 1-7页

作者：罗永宽王文浩武汉大学马克思主义学院武汉430072

建设中华民族现代文明是实现中华民族伟大复兴的应有之义和内在要求。“七个着力”要求是对习近平文化思想方法体系的集中概括,科学谋划了建设中华民族现代文明的路线图和任务书。“着力加强党对宣传思想文化工作的领导”是建设中华民... 详细信息

建设中华民族现代文明是实现中华民族伟大复兴的应有之义和内在要求。“七个着力”要求是对习近平文化思想方法体系的集中概括,科学谋划了建设中华民族现代文明的路线图和任务书。“着力加强党对宣传思想文化工作的领导”是建设中华民族现代文明的根本保证和首要前提;“着力建设具有强大凝聚力和引领力的社会主义意识形态”决定了中华民族现代文明的建设方向;“着力培育和践行社会主义核心价值观”在中华民族现代文明建设进程中发挥着价值引领作用;“着力提升新闻舆论传播力引导力影响力公信力”和“着力推动文化事业和文化产业繁荣发展”是建设中华民族现代文明的关键支撑和重要载体;“着力赓续中华文脉、推动中华优秀传统文化创造性转化和创新性发展”筑牢了建设中华民族现代文明的文脉根基;“着力加强国际传播能力建设、促进文明交流互鉴”拓展了建设中华民族现代文明的世界眼光。

关键词：习近平文化思想 “七个着力” 中华民族现代文明

An Evaluation of Metronidazole Degradation in a Plasma-Assisted Rotating Disk Reactor Coupled with TiO2 in Aqueous Solution

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Engineering 2021年第11期7卷 1603-1610页

作者： yong Cai Guang-Wen Chu yong luo Meng-Jun Su Bao-Ju Wang Bao-Chang Sun Jian-Feng Chen State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High-Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Pollution involving pharmaceutical components in bodies of water is an increasingly serious environmental issue.Plasma discharge for the degradation of antibiotics is an emerging technology that may be relevant toward addressing this issue.In this work,a plasma-assisted rotating disk reactor(plasma-RDR)and a photocatalyst—namely,titanium dioxide(TiO_(2))—were coupled for the treatment of metronidazole(MNZ).Discharge uniformity was improved by the use of a rotating electrode in the plasma-RDR,which contributed to the utilization of ultraviolet(UV)light radiation in the presence of TiO_(2).The experimental results showed that the degradation efficiency of MNZ and the concentration of generated hydroxyl radicals respectively increased by 41%and 2.954 mg∙L^(-1) as the rotational speed increased from 0 to 500 r∙min^(-1).The synergistic effect of plasma-RDR plus TiO_(2) on the generation of hydroxyl radicals was evaluated.Major intermediate products were identified using three-dimensional(3D)excitation emission fluorescence matrices(EEFMs)and liquid chromatography-mass spectrometry(LC-MS),and a possible degradation pathway is proposed herein.This plasma-catalytic process has bright prospects in the field of antibiotics degradation.

关键词： Plasma-assisted rotating disk reactor Pulsed discharge Metronidazole Degradation TiO_(2)

Flexible microfluidic nanoplasmonic sensors for refreshable and portable recognition of sweat biochemical fingerprint

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npj Flexible Electronics 2022年第1期6卷 593-602页

作者： Xuecheng He Chuan Fan yong luo Tailin Xu Xueji Zhang School of Biomedical Engineering Health Science CenterShenzhen UniversityShenzhen 518060People’s Republic of China Beijing Advanced Innovation Center for Materials Genome Engineering Research Center for Bioengineering and Sensing TechnologyUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China

Wearable sweat sensors with various sensing systems can provide noninvasive medical diagnostics and healthcare monitoring.Here,we demonstrate a wearable microfluidic nanoplasmonic sensor capable of refreshable and portable recognition fingerprint information of targeted biomarkers including urea,lactate,and pH in sweat.A miniature,thin plasmonic metasurface with homogeneous mushroom-shaped hot spots and high surface-enhanced Raman scattering(SERS)activity is designed and integrated into a microfluidics platform.Compared to conventional wearable SERS platforms with the risk of mixed effect between new and old sweat,the microfluidic SERS system allows sweat administration in a controllable and high temporal-resolution fashion,providing refreshable SERS analysis.We use a portable and customized Raman analyzer with a friendly human-machine interface for portable recognition of the spectroscopic signatures of sweat biomarkers.This study integrates epidermal microfluidics with portable SERS molecular recognition,presenting a controllable,handy,and dynamical biofluid sensing system for personalized medicine.

关键词： signature portable fluid

基于分布式光纤传感技术的北京宋庄地面沉降和地裂缝综合监测

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地质通报 2024年第5期43卷 859-867页

作者：沙特罗勇雷坤超田芳王新惠北京市地质环境监测所北京100195 城市地下水安全防控技术创新基地北京100195

针对地面沉降及地裂缝,传统点式监测技术手段难以实现地质体变形的连续监测,且无法通过地面沉降、地裂缝的综合监测定量分析两者之间的关系。基于钻孔全断面分布式光纤监测技术实现了地面沉降和地裂缝同步监测,根据监测结果对北京宋庄... 详细信息

针对地面沉降及地裂缝,传统点式监测技术手段难以实现地质体变形的连续监测,且无法通过地面沉降、地裂缝的综合监测定量分析两者之间的关系。基于钻孔全断面分布式光纤监测技术实现了地面沉降和地裂缝同步监测,根据监测结果对北京宋庄地区地下水-地面沉降-地裂缝之间的关系进行了分析。监测结果表明,宋庄地面沉降主要受到地下水开采影响,含水砂层抽水发生压缩变形,地裂缝两侧均存在明显的地面沉降,且差异沉降显著;差异沉降量和地裂缝变形量均持续增大,但增大速率放缓。地面沉降、地裂缝同步监测结果表明,该地区地裂缝发育主要受地层差异沉降影响。

关键词：分布式光纤钻孔全断面光纤监测地面沉降地裂缝差异沉降北京

A low-density polyethylene composite with phosphorus-nitrogen based flame retardant and multi-walled carbon nanotubes for enhanced electrical conductivity and acceptable flame retardancy

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1332-1345页

作者： yong luo Yuhui Xie Renjie Chen Ruizhi Zheng Hua Wu Xinxin Sheng Delong Xie Yi Mei Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan ProvinceFaculty of Chemical EngineeringKunming University of Science and TechnologyKunming650500China Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou510006China Institute for Chemical and Bioengineering Department of Chemistry and Applied BiosciencesETH Zurich8093ZurichSwitzerland

Design and exploitation of flame retardant polymers with high electrical conductivity are desired for polymer applications in electronics.Herein,a novel phosphorus-nitrogen intumescent flame retardant was synthesized from pentaerythritol octahydrogen tetraphosphate,phenylphosphonyl dichloride,and aniline.Low-density polyethylene was combined with the flame retardant and multi-walled carbon nanotubes to form a nanocomposite material via a ball-milling and hot-pressing method.The electrical conductivity,mechanical properties,thermal performance,and flame retardancy of the composites were investigated using a four-point probe instrument,universal tensile machine,thermogravimetric analysis,and cone calorimeter tests,respectively.It was found that the addition of multi-walled carbon nanotubes can significantly improve the electrical conductivity and mechanical properties of the low-density polyethylene composites.Furthermore,the combination of multi-walled carbon nanotubes and phosphorus–nitrogen flame retardant remarkably enhances the flame retardancy of matrixes with an observed decrease of the peak heat release rate and total heat release of 49.8%and 51.9%,respectively.This study provides a new and effective methodology to substantially enhance the electrical conductivity and flame retardancy of polymers with an attractive prospect for polymer applications in electrical equipment.

关键词： MWCNTs PEPA electrical conductivity flame retardant low density polyethylene

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浅谈富氢燃气锅炉的工程建设及试车

广州化工 2024年第3期52卷 138-141页

作者：骆咏章东莞巨正源科技有限公司广东东莞523980

探讨了基于富氢气含量的燃料,建设120 t/h中温中压燃气锅炉项目的特点和成功经验。通过介绍富氢燃气锅炉工程建设中应重点关注安装前的准备工作、锅炉钢结构安装、水冷壁组装、水压试验和化学清洗等工作;试车过程中要确保锅炉联锁正常投... 详细信息

探讨了基于富氢气含量的燃料,建设120 t/h中温中压燃气锅炉项目的特点和成功经验。通过介绍富氢燃气锅炉工程建设中应重点关注安装前的准备工作、锅炉钢结构安装、水冷壁组装、水压试验和化学清洗等工作;试车过程中要确保锅炉联锁正常投用,锅炉给水泵、鼓风机、循环风机平稳运行,转动设备轴承温度、振动等符合设计要求,锅炉本体附属系统膨胀、严密性工作正常,燃烧器调试火焰外观正常、强度稳定可靠,燃烧器负荷易于调整;汽水系统严密性好;并分析项目实施过程中出现的问题和采取相应的工程对策。以期对今后同类项目的建设和试车有所借鉴意义。

关键词：富氢气燃气锅炉工程建设试车