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Friction and wear behavior and mechanism of low carbon microalloyed steel containing Nb

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China Foundry 2023年第3期20卷 263-270页

作者： mei-yi Yuan Jia-cheng Zhang yi-tao Yang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

Dry sliding friction and wear test of Nb containing low carbon microalloyed steel was carried out at room temperature,and the effect of Nb on the wear behavior of the steel,as welll as the mechanism was *** electron microscopy(SEM) and energy dispersive spectrometry(EDS) were employed to analyze the morphology and composition of the worn surface,and the structure evolution of the plastic deformation *** carbide content and type in the steel were analyzed by the electrolytic extraction device and X-ray diffraction(XRD).The experimental results demonstrate that the addition of 0.2% Nb can refine the grain and generate Nb C to improve the wear resistance of the *** enhancing the load and speed of wear experiment,the wear mechanism of the test steel with 0.2% Nb changes from slight oxidation wear to severe adhesion wear and oxidation *** with the load,the increase in the rotation speed exerts a greater influence on the wear of the test steel.

关键词： Nb content low carbon microalloyed steel friction and wear carbide

Full-scale study of removal effect on Cyclops of zooplankton with chlorine dioxide

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Journal of Environmental Sciences 2004年第5期16卷 746-750页

作者： LINTao CUIFu-yi LIUDong-mei ANDong SchoolofMunicipalandEnvironmentalEngineering HarbinInstituteofTechnologyHarbin150090China

Cyclops of zooplankton propagated excessively in eutrophic water body and could not be effectively inactivated by the conventional disinfections process like chlorination due to its stronger resistance to oxidation. In this paper, a full-scale study of chlorine dioxide preoxidation cooperating with routine clarification process for Cyclops removal was conducted in a waterworks. The experimental results were compared with that of the existing prechlorination process in several aspects: including the Cyclops removal efficiencies of water samples taken from the outlets of sedimentation tank and sand filter and the security of drinking water and so on. The results showed that chlorine dioxide might be more effective to inactivate Cyclops than chlorine and Cyclops could be thoroughly removed from water by pre-dosing chlorine dioxide process. The GC-MS examination and Ames test further showed that the sort and amount of organic substance in the treated water by chlorine dioxide preoxidation were evidently less than that of prechlorination and the mutagenicity of drinking water treated by pre-dosing chlorine dioxide was substantially reduced compared with prechlorination.

关键词： Cyclops of zooplankton chlorine dioxide chlorine preoxidation water treatment

九年制中西医临床医学专业学生核心能力体系构建

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中国中西医结合杂志 2025年第1期45卷 12-17页

作者：张雅萍薛培何伊梅闫永红北京中医药大学管理学院北京102488 北京中医药大学教务处北京102488

目的从培养中西医结合临床人才相关问题出发,构建九年制中西医临床医学专业学生核心能力体系。方法运用文献研究法、半结构访谈法、质化内容分析法,通过“开放式编码—主轴式编码—选择式编码”的扎根理论编码程序,初步构建九年制中西... 详细信息

目的从培养中西医结合临床人才相关问题出发,构建九年制中西医临床医学专业学生核心能力体系。方法运用文献研究法、半结构访谈法、质化内容分析法,通过“开放式编码—主轴式编码—选择式编码”的扎根理论编码程序,初步构建九年制中西医临床医学专业学生核心能力体系。采用德尔菲法和层次分析法完善体系,确认各项核心能力权重。结果在初步构建阶段,建立包含4个一级指标、13个二级指标、35个三级指标的九年制中西医临床医学专业学生核心能力体系。在修订完善阶段,遴选24名从事相关工作10年以上的中西医结合临床、科研、教育等专家进行咨询。两轮咨询的专家权威系数分别为0.93、0.96,问卷回收率均为100%。根据专家咨询反馈,结合课题组讨论,最终确立包括专业基础、社会协调、人文素养、自我发展在内的4个一级指标、10个二级指标、33个三级指标,形成中西医临床医学专业学生核心能力体系。结论构建的九年制中西医临床医学专业学生核心能力体系体现了“专博兼顾、中西融通”的专业培养特色,具有良好的合理性和科学性。

关键词：核心能力中西医临床医学中西医结合九年制教育拔尖人才

Programmed cell death receptor 1 inhibitor Pembrolizumab in the treatment of advanced gastric cancer

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World Journal of Gastrointestinal Surgery 2025年第2期17卷 16-19页

作者： Xue-mei yi Hong-Qiao Cai Yan Jiao Department of Second Operation Room The First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina Department of Hepatobiliary and Pancreatic Surgery General Surgery CenterThe First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina

This editorial discusses Christodoulidis et al's article,which appeared in the most recent *** clinical trials have demonstrated the programmed cell death receptor 1(PD-1)inhibitor Pembrolizumab involved combination therapy can improve the efficacy of advanced gastric cancer(AGC).Pembrolizumab combined with chemotherapy can enhance its sensitivity,and further eliminate tumor cells that develop resistance to *** combination of Pembrolizumab and Trastuzumab targeting human epidermal growth factor receptor 2 showed improved *** overall toxic effects of Pembrolizumab are significantly lower than traditional chemotherapy,and the safety is ***-1 inhibitor Pembrolizumab sheds a light on the treatment of AGC and brings new hope to the clinical practice.

关键词： Programmed cell death receptor 1 inhibitor Pembrolizumab Advanced gastric cancer Chemotherapy Trastuzumab

Improved length of calcium sulfate crystal seeds and whiskers via ball milling and hydration treatment

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Chinese Journal of Chemical Engineering 2024年第7期71卷 102-109页

作者： Yuke Li Yuxin Liu Jizhen Huang yi mei Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Kunming University of Science and TechnologyKunming 650500China

Elucidating the effect of growth periods on the quality of calcium sulfate whiskers(CSWs)prepared from calcium sulfate dihydrate(DH)is ***,crystal seeds and whiskers were prepared from DH in a water–glycerol *** whiskers were obtained from crystal seeds prepared via hydration of DH for 30 s than via ball milling for 5 min followed by hydration for 20 *** attachment of cetyltrimethyl ammonium bromide and glycerol additives to the whisker tops promoted whisker *** whisker sponges exhibited good thermal barrier properties and compression cycle stability.

关键词： Hemihydrate gypsum whisker Hydration Ball milling/hydration Crystal seed Growth process

Effect of pH on binding of pyrene to hydrophobic fractions of dissolved organic matter(DOM) isolated from lake water

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Acta Geochimica 2016年第3期35卷 288-293页

作者： yi mei yingchen Bai Liying Wang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences State Environmental Protection Key Laboratory for Lake Pollution Control Research Center of Lake EnvironmentChinese Research Academy of Environmental Sciences

In order to better understand the compositional and structural complexity of dissolved organic matter(DOM) macromolecules and provide mechanistic information on the binding of hydrophobic organic contaminants(HOCs) to DOM, we fractionated large amounts of lake water into three hydrophobic DOM-fractions. The variation of the partitioning coef?cients(K_(DOC)) of pyrene at different p H levels was examined by ?orescence quenching titration. Results show that, relative to the more polar acidic DOM-fractions, the hydrophobic neutral fraction exhibits a higher sorption ability to pyrene. Generally, the sorption of pyrene to the three hydrophobic fractions is strongly pH-dependent. The K_(DOC) values of pyrene generally increase with decreasing p H levels, which is especially obvious in the sorption of pyrene to the fulvic acid fractions, suggesting that the binding is controlled by hydrophobic interactions. The mechanisms underlying the binding of pyrene to the hydrophobic fractions were also discussed. Our data are bene?cial to further understanding the binding of HOCs to DOM and how it has been affected,which may result in more accurate predictions of K_(DOC).

关键词：疏水性有机污染物溶解有机物 DOM 酸组分 pH值分离湖水绑定

Experimental study and cellular automata simulation of corrosion behavior of ferritic stainless steel in molten aluminum

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Journal of Iron and Steel Research International 2022年第9期29卷 1485-1494页

作者： Ji-yin Long Tian-tian Zhao mei-yi Yuan yi-tao Yang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

The corrosion behavior of feritic stainless steel(446)after being immersed in molten Al alloy at 750℃ for 1,2,4,and 8 h has been investigated experimentally and *** microstructure and composition distribution at the corrosion interface were characterized using the optical microscope,scanning electron microscope,and energy dispersive *** results showed that Cr and Si synergistically delay the progress of corrosion at the interface of the intermetallic compounds(IMC).In the early stage of corrosion,Si element was enriched at the interface of IMC1 and IMC2,and the diffusion channels of Al element were occupied by ***,as the corrosion progresses,Cr and Si gradually gather to form a band-like structure and coarsen,causing their hindering effect to be *** the corrosion time increases,the banded structure was further aggregated and coarsened,and the inhibitory effect of Cr and Si elements on corrosion was strongly *** addition,based on the cellular automata dynamics model of reaction-diffusion,the corrosion process of ferritic stainless steel in aluminum alloy melts was *** is demonstrated that if there is no stabilizing effect of Cr element,the thickness of IMC will be doubled.

关键词： Stainless steel Molten Al alloy Intermetallic Diffusion-Cellular automata

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耐高温含氢乙烯基有机硅树脂的合成及改性

中国塑料 2025年第1期39卷 31-36页

作者：何文峰赵彤杰谢于辉梅毅谢德龙昆明理工大学化学工程学院云南省磷化工节能与新材料重点实验室昆明云南省磷资源技术创新中心昆明650500

随着国防工业、电子信息工业以及航空航天等领域的快速发展,对性能优异的耐高温材料的需求不断增加。以含有硅-氢键和硅-乙烯键的烷氧基硅烷为原料,采用简单的两步法在酸性条件下成功制备出了热稳定性较好的含氢乙烯基有机硅树脂。研究... 详细信息

随着国防工业、电子信息工业以及航空航天等领域的快速发展,对性能优异的耐高温材料的需求不断增加。以含有硅-氢键和硅-乙烯键的烷氧基硅烷为原料,采用简单的两步法在酸性条件下成功制备出了热稳定性较好的含氢乙烯基有机硅树脂。研究了改性有机硅树脂的合成条件,通过红外光谱和热重分析仪表征了其化学结构和热稳定性,并采用热重-红外光谱联用分析了其热解机理。结果显示,三乙氧基硅烷和乙烯基三乙氧基硅烷以摩尔比5/1投料,控制盐酸水溶液的pH值为1、水解温度为30℃、水解时间为3 h制备的有机硅树脂在800℃下残炭率达到97.84%,远高于一般有机硅树脂的耐高温性能。对有机硅树脂的热解机理分析表明,含氢乙烯基有机硅树脂主要经历两个热分解阶段:首先是253℃左右的由有机硅树脂侧链连接部分引起的乙烯基氧化降解;其次是578℃左右有机硅树脂末端的硅羟基回咬导致有机硅树脂骨架的随机断裂和重排。

关键词：耐高温改性有机硅树脂热降解机理聚合物

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移动式三维激光扫描在地铁竣工测量中的应用

城市勘测 2025年第1期 76-80页

作者：周翔周凯朱海易梅武汉市测绘研究院湖北武汉430022

基于SINS惯导系统的移动式三维激光扫描方法,将三维激光扫描仪搭载于地铁隧道检测小车上,可快速、准确、大量采集地铁隧道三维点云数据,运用相应数据处理软件将三维点云模型展开还原,实现地铁隧道三维可视化,得到竣工测量需要的各种数... 详细信息

基于SINS惯导系统的移动式三维激光扫描方法,将三维激光扫描仪搭载于地铁隧道检测小车上,可快速、准确、大量采集地铁隧道三维点云数据,运用相应数据处理软件将三维点云模型展开还原,实现地铁隧道三维可视化,得到竣工测量需要的各种数据。以武汉市某地铁竣工项目为例,将基于点云数据形成的隧道边线、轨道边线与经传统测量技术所取得的测量成果进行精度对比分析,结果表明,该方法在地铁竣工测量中,具有可行性和一定的精度、效率优势。

关键词：移动式三维激光扫描 SINS惯导系统地铁竣工测量精度检验与分析