检索结果-南通市图书馆

Corrosion and in vitro cytocompatibility investigation on the designed Mg-Zn-Ag metallic glasses for biomedical application

引用

Journal of Magnesium and Alloys 2024年第4期12卷 1566-1580页

作者： Jian Wang Lingzhong Meng Weixin Xie Chen Ji Ronghua Wang Pinghu Zhang Liling Jin Liyuan Sheng yufeng zheng School of Mechanical Engineering Yangzhou UniversityYangzhou225127China Department of Materials Science and Engineering Seoul National UniversitySeoulSouth Korea Huizhou Port Customs Huizhou516081China Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases Institute of Translational MedicineMedical CollegeYangzhou UniversityYangzhou225009China Center for Research in Computational Thermochemistry(CRCT) Department of Chemical EngineeringEcole polytechnique de MontréalMontréalQuébecH3C 3A7Canada Shenzhen Institute Peking UniversityShenzhen 518057China PKU-HKUST ShenZhen-HongKong Institution Shenzhen518057China

In the present work,seven Mg-Zn-Ag alloys with the nominal composition of Mg_(96-x)Zn_(x)Ag_(4)(x=17,20,23,26,29,32,35 in at.%)were prepared by induction melting and single-roller *** X-ray diffraction(XRD)analyses indicate the metallic glasses with three composition of Mg_(73)Zn_(23)Ag_(4),Mg_(70)Zn_(26)Ag_(4),and Mg_(67)Zn_(29)Ag_(4)were obtained *** differential scanning calorimetry(DSC)measurement was used to obtain the characteristic temperature of Mg-Zn-Ag metallic glasses for the glass-forming ability *** maximum glass transition temperature(Trg)was found to be 0.525 with a composition close to Mg_(67)Zn_(29)Ag_(4),which results in the best glass-forming ***,the immersion test in simulated body fluid(SBF)demonstrate the relative homogeneous corrosion behavior of the Mg-Zn-Ag metallic *** corrosion rate of Mg-Zn-Ag metallic glasses in SBF solution decreases with the increase of Zn *** sample Mg_(67)Zn_(29)Ag_(4)has the lowest corrosion rate of 0.19mm/yr,which could meet the clinical application requirement *** in vitro cell experiments show that the Madin-Darby canine kidney(MDCK)cells cultured in sample Mg_(67)Zn_(29)Ag_(4)and its extraction medium have higher ***,the Mg-Zn-Ag metallic glasses exhibit obvious inhibitory effect on human rhabdomyosarcoma(RD)tumor *** present investigations on the glass-forming ability,corrosion behavior,cytocompatibility and tumor inhibition function of the Mg-Zn-Ag based metallic glass could reveal their biomedical application possibility.

关键词： Metallic glasses Mg-Zn-Ag Corrosion behavior In vitro cytocompatibility

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of layer thickness on formation quality,microstructure,mechanical properties,and corrosion resistance of WE43 magnesium alloy fabricated by laser powder bed fusion

引用

Journal of Magnesium and Alloys 2024年第4期12卷 1367-1385页

作者： Bangzhao Yin Jinge Liu Bo Peng Mengran Zhou Bingchuan Liu Xiaolin Ma Caimei Wang Peng Wen Yun Tian yufeng zheng State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Institute for Precision Medicine Tsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Beijing AKEC Medical Co. Ltd.Beijing 102200China School of Materials Science and Engineering Peking UniversityBeijing 100871China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China

Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical *** thickness(LT)is of great significance to the L-PBF process but has not been studied for Mg *** this study,WE43 Mg alloy bulk cubes,porous scaffolds,and thin walls with layer thicknesses of 10,20,30,and 40μm were *** required laser energy input increased with increasing layer thickness and was different for the bulk cubes and porous *** tended to occur at the connection joints in porous scaffolds for LT40 and could be eliminated by reducing the laser energy *** thin wall parts,a large overhang angle or a small wall thickness resulted in porosity when a large layer thicknesses was used,and the porosity disappeared by reducing the layer thickness or laser energy input.A deeper keyhole penetration was found in all occasions with porosity,explaining the influence of layer thickness,geometrical structure,and laser energy input on the *** the samples achieved a high fusion quality with a relative density of over 99.5%using the optimized laser energy *** increased layer thickness resulted to more precipitation phases,finer grain sizes and decreased grain *** the similar high fusion quality,the tensile strength and elongation of bulk samples were significantly improved from 257 MPa and 1.41%with the 10μm layer to 287 MPa and 15.12%with the 40μm layer,in accordance with the microstructural *** effect of layer thickness on the compressive properties of porous scaffolds was ***,the corrosion rate of bulk samples accelerated with increasing the layer thickness,mainly attributed to the increased number of precipitation phases.

关键词： Magnesium alloy WE43 Laser powder bed fusion Layer thickness Process optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Improving corrosion resistance of additively manufactured WE43 magnesium alloy by high temperature oxidation for biodegradable applications

引用

Journal of Magnesium and Alloys 2024年第3期12卷 940-953页

作者： Jinge Liu Bangzhao Yin Fei Song Bingchuan Liu Bo Peng Peng Wen Yun Tian yufeng zheng Xiaolin Ma Caimei Wang State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Department of Orthopaedics Beijing Tsinghua Changgung HospitalInstitute for Precision MedicineTsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China School of Materials Science and Engineering Peking UniversityBeijing 100871China Beijing AKEC Medical Co. Ltd.Beijing 102200China

Laser powder bed fusion(L-PBF)has been employed to additively manufacture WE43 magnesium(Mg)alloy biodegradable implants,but WE43 L-PBF samples exhibit excessively rapid *** this work,dense WE43 L-PBF samples were built with the relativity density reaching 99.9%.High temperature oxidation was performed on the L-PBF samples in circulating air via various heating temperatures and holding *** oxidation and diffusion at the elevated temperature generated a gradient structure composed of an oxide layer at the surface,a transition layer in the middle and the *** oxide layer consisted of rare earth(RE)oxides,and became dense and thick with increasing the holding *** matrix was composed ofα-Mg,RE oxides and Mg_(24)RE_(5) *** precipitates almost disappeared in the transition *** passivation effect was observed in the samples treated by a suitable high temperature *** original L-PBF samples lost 40%weight after 3-day immersion in Hank’s solution,and broke into fragments after 7-day *** casted and solution treated samples lost roughly half of the weight after 28-day *** high temperature oxidation samples,which were heated at 525℃ for 8 h,kept the structural integrity,and lost only 6.88%weight after 28-day *** substantially improved corrosion resistance was contributed to the gradient structure at the *** one hand,the outmost dense layer of RE oxides isolated the corrosive medium;on the other hand,the transition layer considerably inhibited the corrosion owing to the lack of ***,high temperature oxidation provides an efficient,economic and safe approach to inhibit the corrosion of WE43 L-PBF samples,and has promising prospects for future clinical applications.

关键词： Laser powder bed fusion Biodegradable magnesium alloy High temperature oxidation Corrosion resistance WE43.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tunning the bandgap of MnO_(2)homojunction by building active high-index facet to achieve rapid electron transfer for enhanced photocatalytic sterilization

引用

Journal of Materials Science & Technology 2024年第1期168卷 265-275页

作者： Tao Zhang Bo Li Chaofeng Wang Shuilin Wu Shengli Zhu Hui Jiang yufeng zheng Zhaoyang Li Zhenduo Cui Yu Zhang Paul K Chu Xiangmei Liu Biomedical Materials Engineering Research Center Hubei Key Laboratory of Polymer MaterialsMinistry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science and Engineering Hubei UniversityWuhan 430062China School of Health Science&Biomedical Engineering Hebei University of TechnologyTianjin 300401China School of Materials Science&Engineering Peking UniversityBeijing 100871China School of Materials Science&Engineering the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjin 300072China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China Department of Physics Department of Materials Science and Engineering and Department of Biomedical EngineeringCity University of Hong KongHong Kong 999077China

Photocatalysis has been a research hotspot in recent years,and the design and modification of photocat-alysts have been the key *** methods for designing photocatalysts,including constructing heterojunctions and homojunctions,have been developed on the basis of *** this study,two homojunctions of manganese dioxide(MnO_(2)),including a high-index crystal plane homojunction and a general homojunction,are prepared using a stepwise hydrothermal *** a capping agent,the high-index crystal surface of the MnO_(2)is *** is found that the electron transport efficiency be-tween the two components of the homojunction with high-index planes is higher and the adsorption capacity of the oxygen is stronger,which leads to higher photocatalytic *** addition,the newly designed high-index homojunction is used for the treatment of bacterial infections,and it kills Staphy-lococcus aureus(***)and Escherichia coli(***)at rates of 99.95%±0.04%and 99.31%±0.25%,*** also has excellent therapeutic effects on mouse wounds,which implies superb practical application *** work provides a new strategy for the improved design of homojunctions and the application of photocatalytic materials.

关键词： Photocatalysis Homojunction Bandgap High-index facet Antibacterial

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Corrigendum to“Bi-continuous Mg-Ti interpenetrating-phase composite as a partially degradable and bioactive implant material”[Journal of Materials Science&Technology 146(2023)211-220]

引用

Journal of Materials Science & Technology 2024年第3期170卷 255-257页

作者： Chenxi Dou Mingyang Zhang Dechun Ren Haibin Ji Zhe Yi Shaogang Wang Zengqian Liu Qiang Wang yufeng zheng Zhefeng Zhang Rui Yang Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of StomatologyChina Medical UniversityShenyang 110001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Peking UniversityBeijing 100871China Center for Adaptive System Engineering School of Creativity and ArtShanghaiTech UniversityShanghai 201210China

The authors are very sorry for their carelessness that there are some problems with Fig.3 in the original manuscript.

关键词： composite phase partially

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

巨噬细胞负载Fe_(3)O_(4)@PLGA纳米颗粒触发智能催化功能杀死多重耐药大肠杆菌

引用

Engineering 2024年第3期34卷 174-186页

作者： Jieni Fu Xiangmei Liu Zhaoyang Li yufeng zheng Yu Zhang Hui Jiang Yanqin Liang Shengli Zhu Zhenduo Cui Shuilin Wu Key Laboratory of Advanced Ceramics and Machining Technology of the Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300401China School of Materials Science and Engineering Peking UniversityBeijing 100871China School of Health Sciences and Biomedical Engineering Hebei University of TechnologyTianjin 300401China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China

Infections with multidrug-resistant(MDR)Gram-negative bacteria,such as MDR Escherichia coli(***),remain a challenge due to the lack of safe antibiotics and high fatality rates under anti-infection *** work presents a form of biomimetic intelligent catalysis inspired by the selective biocatalytic property of macrophages(MΦs),consisting of an intelligent controlling center(a living MΦ)and a Fenton reaction catalyst(Fe_(3)O_(4)@poly(lactic-co-glycolic acid)(PLGA)nanoparticles)for killing MDR *** without harming normal *** MΦ-Fe_(3)O_(4)@PLGA particles(i.e.,the intelligent catalysis particles)exhibit selective biocatalysis activity toward MDR *** by producing H_(2)O_(2) and lipid droplets(LDs).This process activates the lipid metabolism and glycan biosynthesis and metabolism pathways based on the result of RNA sequencing data *** H_(2)O_(2) further reacts with Fe_(3)O_(4)@PLGA to form highly toxic hydroxyl radicals(·OH),while the LDs contain antimicrobial peptides and can target MDR *** highly toxicOH and antimicrobial peptides are shown to combat with MDR ***,such that the antibacterial efficiency of the MΦ-Fe_(3)O_(4)@PLGA particles against MDR *** is 99.29%±0.31%in *** importantly,after several passages,the intelligent catalysis function of the MΦ-Fe_(3)O_(4)@PLGA particles is well ***,the concept of biomimetic intelligent catalysts displays potential for treating diseases other than infections.

关键词： Multidrug-resistant Escherichia coli Macrophage-Fe_(3)O_(4)@PLGA particles Biomimetic intelligent catalysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于副边解耦极板的电容式无线电能传输系统拾取端失谐评估

引用

电力系统自动化 2024年第3期48卷 142-149页

作者：周玮郑宇锋陈泽林李志强易云天麦瑞坤西南交通大学电气工程学院四川省成都市611756

对于电容式无线电能传输(CWPT)系统,准确评估拾取端回路的失谐程度是维持系统谐振稳定的前提。然而,由于系统拾取端的感应电压无法被直接观测,难以通过测量感应电压和回路电流间的相位差来评估拾取端回路的失谐程度。文中提出一种能够... 详细信息

对于电容式无线电能传输(CWPT)系统,准确评估拾取端回路的失谐程度是维持系统谐振稳定的前提。然而,由于系统拾取端的感应电压无法被直接观测,难以通过测量感应电压和回路电流间的相位差来评估拾取端回路的失谐程度。文中提出一种能够间接测量拾取端感应电压相位信息,评估拾取端回路失谐程度的CWPT系统。基于Z参数建立三端口CWPT系统的数学模型和等效电路,并依托该模型提出一种基于副边解耦极板的耦合机构。分析在感应电压测量和失谐程度评估过程中存在的误差,提出拾取端回路失谐程度的评估校正方法。搭建了带有副边解耦极板的CWPT系统原理样机,实验结果表明,拾取端谐振时的失谐程度评估误差不超过1Ω,拾取端感性/容性失谐时的失谐程度评估误差分别小于2%和5%。

关键词：无线电能传输极板副边解耦失谐程度评估相位检测

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于深度置信网络的光伏发电阵列的故障诊断方法

引用

海军工程大学学报 2024年第3期36卷 7-14页

作者：彭辉田程程郑宇锋黄婧柠武汉大学电气与自动化学院武汉430072 海军工程大学电磁能技术全国重点实验室武汉430033

为了对光伏发电阵列的故障进行及时准确的诊断,首先以在Matlab/Simulink中搭建的光伏阵列输出特性仿真模型为基础,采用深度置信网络作为光伏阵列故障诊断算法,并通过蝙蝠算法对网络各隐含层神经元的数量进行优化;然后,以蝙蝠算法优化后... 详细信息

为了对光伏发电阵列的故障进行及时准确的诊断,首先以在Matlab/Simulink中搭建的光伏阵列输出特性仿真模型为基础,采用深度置信网络作为光伏阵列故障诊断算法,并通过蝙蝠算法对网络各隐含层神经元的数量进行优化;然后,以蝙蝠算法优化后的深度置信网络(bat algorithm-deep belief network,BA-DBN)作为故障诊断模型,分别采集不同运行工况下的光伏阵列输出特性四参数,并将其归一化后作为特征样本输入BA-DBN故障诊断模型,实现了对光伏阵列的故障诊断。仿真结果表明:所提出的BA-DBN算法在光伏阵列故障诊断应用中的准确率显著高于KNN、BPNN和原始DBN算法,更加适用于光伏阵列故障诊断,具有更优的分类效果。

关键词：光伏阵列故障诊断深度置信网络蝙蝠算法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

空中智能反射面增强的URLLC多无人机网络

引用

西南交通大学学报 2024年第4期59卷 907-916页

作者：崔亚平应兆朋何鹏郑玉峰吴大鹏王汝言陈烙重庆邮电大学通信与信息工程学院重庆400065 重庆邮电大学先进网络与智能互联技术重庆市高校重点实验室重庆400065 重庆邮电大学泛在感知与互联重庆市重点实验室重庆400065

在多无人机超可靠低时延通信(ultra-reliable low-latency communications,URLLC)网络中,为满足超可靠低时延要求,引入空中智能反射面(intelligent reflecting surface,IRS)辅助通信,提出一种多智能体深度确定性策略梯度(multi-agent deep deterministic policy gradient,MADDPG)方法.首先,建立URLLC多无人机系统模型,其中,多架主无人机作为空中基站为多个地面用户提供服务,一架辅无人机携带IRS作为空中无源中继,辅助主无人机与地面用户通信;然后,考虑多种信道条件和能耗,分别建立复合信道模型和总能耗模型;接着,对问题进行分析,在满足有限块长、无人机能量以及IRS相移的约束下,通过联合优化通信调度、IRS相移以及块长,达到总解码错误率最小化的目标;最后,考虑集中式训练在URLLC场景下的时延敏感限制以及分布式训练在无人机资源限制下的能量限制,设计集中式训练、分布式执行的MADDPG框架.研究结果表明:总解码错误率随着IRS反射单元的增加而急剧下降;同时,总解码错误率随着块长和发射功率的增大而减小,具体来说,块长每增加20个符号,总解码错误率减小91.1%.

关键词：多无人机智能反射面可靠性多智能体

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

翅果油树重要害虫榆兴透翅蛾成虫触角的超微结构

引用

东北林业大学学报 2024年第5期52卷 107-111,118页

作者：余涛郑御丰杨兆富董艳玲植保资源与病虫害治理教育部重点实验室(西北农林科技大学) 杨凌712100

榆兴透翅蛾(Synanthedon ulmicola)是危害翅果油树的重要检疫性害虫。以榆兴透翅蛾成虫为研究对象,利用扫描电镜对榆兴透翅蛾成虫触角感器的类型、形态、分布进行观察。结果表明:榆兴透翅蛾成虫触角为栉齿状,由柄节、梗节、鞭节三部分组... 详细信息

榆兴透翅蛾(Synanthedon ulmicola)是危害翅果油树的重要检疫性害虫。以榆兴透翅蛾成虫为研究对象,利用扫描电镜对榆兴透翅蛾成虫触角感器的类型、形态、分布进行观察。结果表明:榆兴透翅蛾成虫触角为栉齿状,由柄节、梗节、鞭节三部分组成,鞭节数量为56~58小节。共发现8种感器类型,分别为B9hm氏鬃毛、毛形感器(ST-I、ST-II、ST-III)、鳞形感器、刺形感器、锥形感器、腔锥形感器、耳形感器I(SAu-I)、栓锥形感器。其中毛形感器数量最多,分布最广,锥形感器数量最少,仅有2~3处分布。除毛形感器III仅分布于雄蛾触角外,其余种类的感器在雌、雄蛾触角上均有分布。在感器形态上,鳞形感器端部具有明显的雌雄二型现象,其余感器在形态上无较大差异。通过测定不同类型感器的长度、基宽,明确了各种类型感器的性二型差异。

关键词：榆兴透翅蛾成虫触角感器扫描电镜性二型差异

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：