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Carbon fiber cannot always reduce the wear of PEEK for orthopedic implants under DPPC lubrication

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Friction 2023年第3期11卷 395-409页

作者： Shuai YAN Shichao MEN Hongbo ZOU haoji wang Zhongjiang ZHANG Chunshen wang Tianyi SUI Bin LIN Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin UniversityTianjin 300072China

Excellent wear resistance is an important feature of orthopedic ***,although pure polyetheretherketone(PEEK)is outperformed by carbon fiber-reinforced PEEK(CF-PEEK)for stability and durability under laboratory conditions,it is not clear whether CF-PEEK should be preferred in all real-world *** indicate that,under dipalmitoylphosphatidylcholine(DPPC)lubrication,the wear rates of PEEK are 35%-80%lower than the wear rates of CF-PEEK for different implant materials,speeds,loadings,and DPPC *** dynamics calculations confirm that DPPC self-assembles on the PEEK surface to form an easily adsorbed continuous phospholipid lubricating *** contrast,the carbon fibers on the CF-PEEK surface hinder the formation of the protective DPPC film and the CF-PEEK surface is thus subject to faster wear.

关键词： polyetheretherketone(PEEK) carbon fiber-reinforced PEEK(CF-PEEK) dipalmitoylphosphatidylcholine(DPPC) orthopedic implants self-assembly

Water-soluble brown carbon in atmospheric aerosols from the resource-dependent cities:Optical properties,chemical compositions and sources

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Journal of Environmental Sciences 2024年第4期138卷 74-87页

作者： haoji wang Yue Su Yangzheng Liu Fei Xie Xingjun Zhou Ruihong Yu Changwei Lü Jiang He School of Ecology and Environment Inner Mongolia UniversityHohhot 010021China Institute of Environmental Geology Inner Mongolia UniversityHohhot 010021China Environmental Monitoring Center of Inner Mongolia Hohhot 010011China

As a vital type of light-absorbing aerosol,brown carbon(BrC)presents inherent associations with atmospheric photochemistry and climate ***,the understanding of the chemical and optical properties of BrC is limited,especially in some resource-dependent cities with long heating periods in northwest *** study showed that the annual average abundances of Water-soluble BrC(WS-BrC)were 9.33±7.42 and 8.69±6.29μg/m^(3)in Baotou and Wuhai and the concentrations,absorption coefficient(Abs_(365)),and mass absorption efficiency(MAE365)of WS-BrC presented significant seasonal patterns,with high values in the heating season and low values in the non-heating season;while showing opposite seasonal trends for the Absorption Angstr?m exponent(AAE_(300-400)).Comparatively,the levels of WS-BrC in developing regions(such as cities in Asia)were higher than those in developed regions(such as cities in Europe and Australia),indicating the significant differences in energy consumption in these *** combining fluorescence excitation-emission matrix(EEM)spectra with the parallel factor(PARAFAC)model,humic-like(C1 and C2)and proteinlike(C3)substances were identified,and accounted for 61.40%±4.66%and 38.6%±3.78%at Baotou,and 60.33%±6.29%and 39.67%±4.17%at Wuhai,*** results of source apportionment suggested that the potential source regions of WS-BrC varied in heating ***-heating seasons and that the properties of WS-BrC significantly depended on primary emissions(e.g.,combustion emissions)and secondary formation.

关键词： Water-soluble brown carbon Atmospheric aerosols Optical properties PARAFAC Source apportionment

3D multicore-shell CoSn nanoboxes encapsulated in porous carbon as anode for lithium-ion batteries

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Chinese Chemical Letters 2022年第8期33卷 3925-3930页

作者： Daxu Zhang Gen Chen haoji wang Long Chen Ziwei Guo Zuxin Wen Ning Zhang Xiaohe Liu Renzhi Ma School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Chemical Engineering and Energy Zhengzhou UniversityZhengzhou 450001China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)Ibaraki 305-0044Japan Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha 410083China

Due to its high theoretical capacity and appropriate potential platform,tin-based alloy materials are expected to be a competitive candidate for the next-generation high performance anodes of lithium-ion ***,the immense volume change during the lithium-ion insert process leads to severe disadvantages of structural damage and capacity fade,which limits its practical *** this work,a three-dimensional(3 D)multicore-shell hollow nanobox encapsulated by carbon layer is obtained via a three-step method of hydrothermal reaction,annealing and alkali *** the electrochemical reactions,the CoSn@void@C nanoboxes provide internal space to compensate the volumetric change upon the lithiation of Sn,while the inactive component of Co acts as chemical buffers to withstand the anisotropic expansion of *** to the above-mentioned advantages,the elaborated anode delivers an excellent capacity of 788.2 m Ah/g at 100 m A/g after 100 cycles and considerable capacity retention of 519.2 mAh/g even at a high current density of 1 A/g after 300 *** superior stability and high performance indicate its capability as promising anodes for lithium-ion batteries.

关键词： Lithium-ion battery CoSn nanoalloys Multicore-shell nanobox Hydrothermal reaction Sacrificial template

Cu-substitution P2-Na_(0.66)Mn_(1-x)Cu_(x)O_(2) sodium-ion cathode with enhanced interlayer stability

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Journal of Energy Chemistry 2022年第12期75卷 478-485,I0012页

作者： Huanqing Liu Xu Gao Jun Chen Jinqiang Gao haoji wang Yu Mei Huan Liu Wentao Deng Guoqiang Zou Hongshuai Hou Xiaobo Ji State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina School of Materials Science and Engineering Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and ConversionHunan University of Science and TechnologyXiangtan 411201HunanChina

P2-type Mn-based layered oxides are viewed as promising cathode materials for sodium ion battery by virtue of their high theoretical *** that pure Na_(2/3)MnO_(2)suffers from poor cycling performances,Cu-substitution strategy is proposed to effectively alleviate this ***,the structural evolution mechanism of the Cu-containing samples still remains ***,we propose that CuSubstitution P2-type Na_(0.66)Mn_(1-x)Cu_(x)O_(2)with enlarged lattice parameters are conducive to improving the interlayer structure stability through mitigating TMO_(2)slabs *** by synchrotron XAS spectra and ex/in situ XRD,the expansion/contraction of MnO_6 octahedron is dramatically reduced with the increased Cu content,showing the facilitated Na ion ***,when the ratio of Cu to Mn reaches 1:4,the phase transition from P2 to P'2 type at the end of discharge can be suppressed,resulting in the improved interlayer skeleton *** Cu-containing samples with stable interlayer structure exhibit high capacity retention and outstanding rate performances(a capacity of 79.9 m Ah g^(-1)at 5C).This Cu-substitution strategy provides a promising approach to designing highly stable cathodes.

关键词： Sodium-ion battery Manganese-based cathode Cu-substitution In-plane distortion Jahn-Teller effect

SiO2编织纤维增强SiO2复合材料胞体表面测量

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天津大学学报（自然科学与工程技术版） 2020年第6期53卷 609-616页

作者：王玉果王皓吉林彬魏金花方胜天津大学先进陶瓷与加工技术教育部重点实验室天津300072 中国航天科技集团有限公司先进功能复合材料重点实验室北京101312

面向SiO2编织纤维增强SiO2(WFSiO2/SiO2)复合材料在胞体层面的表面形貌测量工程,提出了一种三维测量方法.针对采样参数设置不合理,会造成测量结果失真的问题,设计开发了一种确定最大采样步长的方法.该方法利用误差估计的统计学原理,建... 详细信息

面向SiO2编织纤维增强SiO2(WFSiO2/SiO2)复合材料在胞体层面的表面形貌测量工程,提出了一种三维测量方法.针对采样参数设置不合理,会造成测量结果失真的问题,设计开发了一种确定最大采样步长的方法.该方法利用误差估计的统计学原理,建立了任意采样参数下获得的测量结果与准确测量值之间的误差的概率密度关系,并在此基础上提出了判断特定采样步长得到的测量结果是否可靠的准则,进而可以确定使测量结果符合工程要求的最大采样步长,从而将由采样引起的测量结果误差控制在最大残差的15%范围内.应用本文提出的方法确定了3种WFSiO2/SiO2复合材料的胞体最大采样步长,数值分别为7μm、6μm和8μm.研究了WFSiO2/SiO2复合材料的微观组织结构对其胞体层面的最大采样步长的影响,注意到材料所用的编织纤维直径在6~8μm之间.根据纤维直径与胞体最大采样步长之间的数值关系可以判明:在胞体层面,WFSiO2/SiO2复合材料的最大采样步长与其微观重复性特征具有密切关系,数值上约等于其微观的增强纤维直径;利用本方法确定的最大采样步长,可以实现WFSiO2/SiO2复合材料胞体表面不失真的采样与测量分析.该研究成果作为编织纤维增强复合材料纤维束-胞体-全表面测量评价体系的一个环节,为该种材料更可靠的表面质量检测和工程应用奠定了基础.

关键词：长纤维编织增强复合材料表面测量最大采样步长石英纤维

乡村振兴视角下界首市高素质农民培育体系构建探析

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南方农业 2023年第23期17卷 84-86,93页

作者：王浩基界首市乡村振兴学院安徽界首236500

实施乡村振兴战略,是党中央作出的重大决策部署,是全面建设社会主义现代化国家的重大历史任务,高素质农民的培育和发展是乡村振兴的重要组成部分。作为国家级农业产业化重点县,安徽省界首市在农业农村领域有着广阔的发展空间和机遇。为... 详细信息

实施乡村振兴战略,是党中央作出的重大决策部署,是全面建设社会主义现代化国家的重大历史任务,高素质农民的培育和发展是乡村振兴的重要组成部分。作为国家级农业产业化重点县,安徽省界首市在农业农村领域有着广阔的发展空间和机遇。为了建立健全的高素质农民培育体系、推动乡村振兴战略的实施,介绍了界首市高素质农民培育工作的主要做法和成效,分析了工作中存在的一些问题和挑战,提出了强化资金支持、提升学员求知欲望、提供延伸服务等对策。

关键词：乡村振兴高素质农民培育安徽省界首市

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重视和加强医疗器械管理的全过程

中国医学装备 2005年第6期2卷 14-16页

作者：王浩基新疆哈密地区第二人民医院新疆哈密839001

随着科学技术的发展,医院现代化程度越来越高,设备技术越趋高、精、尖,对医疗器械科的任务、人员素质、技术水平的要求将更高更严。本文从医疗器械的论证、选购、验收、安装、调试、使用、归档、建立各种帐卡、维修、报废等全过程进行分... 详细信息

随着科学技术的发展,医院现代化程度越来越高,设备技术越趋高、精、尖,对医疗器械科的任务、人员素质、技术水平的要求将更高更严。本文从医疗器械的论证、选购、验收、安装、调试、使用、归档、建立各种帐卡、维修、报废等全过程进行分析,提出对医疗器械规范化、制度化、系统化的管理体系,提高医疗器械的使用率。

关键词：医疗器械管理医院现代化医疗器械科科学技术人员素质管理体系规范化制度化系统化使用率

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基于深度学习的图像修复方法研究进展

计算机工程与应用 2024年第22期60卷 58-73页

作者：陈文祥田启川廉露张晓行王浩吉北京建筑大学电气与信息工程学院北京100044 建筑大数据智能处理方法研究北京市重点实验室北京100044

图像修复是通过算法或技术对受损或缺失的图像进行恢复和修复的过程,是计算机视觉领域的研究热点之一。梳理了近些年基于深度学习的图像修复方法的发展脉络,将其分为单模态图像修复方法和多模态图像修复方法。单模态图像修复方法分为基... 详细信息

图像修复是通过算法或技术对受损或缺失的图像进行恢复和修复的过程,是计算机视觉领域的研究热点之一。梳理了近些年基于深度学习的图像修复方法的发展脉络,将其分为单模态图像修复方法和多模态图像修复方法。单模态图像修复方法分为基于卷积自编码的图像修复方法、基于GAN的图像修复方法、基于Transformer的图像修复方法和基于扩散模型的图像修复方法,而多模态图像修复方法分为基于文本引导的图像修复方法、基于音频引导的图像修复方法、基于视频引导的图像修复方法和基于多模态融合的图像修复方法。对比分析了各类方法的原理和优缺点,介绍了常用数据集和评价指标,评估了代表性方法在常用数据集上的性能表现,并对该领域目前存在的挑战和未来的发展方向进行了分析和展望。

关键词：图像修复计算机视觉深度学习

纤维方向对C/SiC复合材料摩擦学特性的影响

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润滑与密封 2018年第4期43卷 1-7页

作者：隋天一林彬魏金花王皓吉闫帅王安颖天津大学机械工程学院天津300000

以不同纤维方向C/SiC复合材料分别与氧化铝增韧的氧化锆陶瓷(Al_2O_3-ZrO_2)及调质处理的45~#钢组成摩擦副进行销-盘摩擦实验,研究对摩副材料及纤维方向对摩擦副摩擦磨损性能及磨损机制的影响。结果表明,C/SiC复合材料与Al_2O_3-ZrO_2和... 详细信息

以不同纤维方向C/SiC复合材料分别与氧化铝增韧的氧化锆陶瓷(Al_2O_3-ZrO_2)及调质处理的45~#钢组成摩擦副进行销-盘摩擦实验,研究对摩副材料及纤维方向对摩擦副摩擦磨损性能及磨损机制的影响。结果表明,C/SiC复合材料与Al_2O_3-ZrO_2和45~#钢摩擦时,其垂直纤维叠层方向的摩擦磨损性能均优于平行纤维叠层方向,且垂直纤维叠层方向C/SiC复合材料与Al_2O_3-ZrO_2摩擦副具有最小的摩擦因数和磨损率,摩擦过程更稳定;纤维C/SiC复合材料与Al_2O_3-ZrO_2陶瓷和45~#钢摩擦副的磨损形式主要均为磨粒磨损,与45~#钢摩擦时还伴随着化学磨损。

关键词： C/SiC复合材料摩擦副材料纤维方向摩擦性能磨损机制