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Cold Plasma Surface Modification of NiTi for Biomedical Applications

Journal of Materials Science & Technology 2004年第6期20卷 769-771页

作者： JunYANG jianhuawang InstituteofPlasmaPhysics ChineseAcademyofSciencesHefei230031China SchoolofMaterialsScienceandEngineering WuhanInstituteofChemicalTechnologyWuhan430073China

Surface-grafted poly(ethylene glycol) (PEG) molecules are known to prevent protein adsorption to the surface. Nitinol samples were coated under tetraglyme ECR cold plasma conditions to enhance its biocompatibility. The modified Nitinol surfaces were characterized by high resolution ESCA and contact angle, it was demonstrated that the deposited PEG-like coatings were built up mainly of-CH2-CH2-O- linkages in surfaces. The surface wettability of the modified Nitinol was increased compared with the control surface. Human plasma protein was adsorbed on Nitinol evaluated by SEM, the protein adsorption on modified surfaces decreased rapidly. Thus, the potential benefits of cold plasma technique will be of use to the biomedical industries improving the biocompatibility of metals.

关键词： Cold plasma Nitinol Modification Protein adsorption

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Platelet Adhesion onto Nitinol Surfaces Modified by Microwave Cold-plasma

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Chinese Chemical Letters 2005年第1期16卷 75-77页

作者： JunYANG jianhuawang ShenYiTONG InstituteofPlasmaPhysics ChineseAcademyofSciencesHefei230031／／SchoolofMaterialsScienceandEngineeringWuhanInstituteofChemicalTechnologyWuhan430073 SchoolofMaterialsScienceandEngineering WuhanInstituteofChemicalTechnologyWuhan430073

The macromolecular structures on nitinol surfaces were prepared by ECR microwave cold-plasma of tetraglyme conditions. The surface chemistry was characterized by high resolution ESCA. The results showed that the modified nitinol surfaces were built up mainly of -CH2-CH2-O- linkages and were particularly effective in preventing platelet adhesion.

关键词： Nitinol cold-plasma modification platelet adhesion.

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Hyperspectral Inversion of Heavy Metal Content in Reclaimed Soil from a Mining Wasteland Based on Different Spectral Transformation and Modeling Methods

Hyperspectral Inversion of Heavy Metal Content in Reclaimed ...

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中国煤炭学会土地复垦与生态修复专业委员会第七届学术研讨会暨第二届委员会会议

作者： ShiwenZhang QiangShen ChaojiaNie YuanfangHuang jianhuawang Qingqing Hu XuejiaoDing Yan Zhou YuanpengChen College of Earth and Environmental Science Anhui University of Science and Technology Faculty of Surveying and Mapping Anhui University of Science and Technology College of Resources and Environmental Sciences China Agricultural University No.1 Engineering Company Ltd.of CCCC First Harbor Engineering Company Lrd Soil remediation center of the Ministry of land and resources of China

The heavy metals(Cr,As,Ni,Cd) in soil surface layer(0-20 cm) were measured by chemical method,and the hyperspectral reflectance data were obtained by *** spectral transformation methods,first-order differential(FDR),second-order differential(SDR),continuum removal(CR) and continuous wavelet transform(CWT),are used for the original spectral *** preprocessing effectively eliminated the noise and baseline drifting and also highlighted the locations of the spectral feature *** least squares regression(PLSR) and radial basis function neural network(RBF) were used to study the hyperspectral inversion of four heavy metals(Cr,As,Ni,Cd).The inversion models of four heavy metals were established in the bands with the highest correlation *** inversion effects were comprehensively evaluated by coefficient of determination(R),root mean square error(RMSE) and residual predictive deviation(RPD) *** results showed that the R valuesof the correlation coefficient were significantly improved after smoothing and spectral transformation when compared to the original *** method combined continuous wavelet transform(CWT)with radial basis function neural network(RBF) demonstrated the best inversion effect on the four heavy metals,and when compared to partial least squares regression(PLSR),the RMSE values were reduced by approximately *** CWT-RBF method can be used as a means of inversion of heavy metals in mining wasteland reclaimed land.

关键词： Heavy metals Reclaimed Soil Mining wasteland

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钢轨轨头探伤不合原因分析

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武汉工程职业技术学院学报 2021年第3期33卷 18-20页

作者：刘晓卫欧阳珉路周剑华王瑞敏赵国知中国铁路郑州局集团有限公司工务部河南郑州450052 宝钢股份中央研究院武钢有限技术中心湖北武汉430080

某线路60kg/m U71Mn钢轨服役10个月后,在日常探伤检查作业中发现一处钢轨轨头部位探伤出波,波幅达到100%,判定为轨头内部重伤。为了分析钢轨探伤不合的原因,取探伤不合钢轨试样采用人工复探方式对伤损进行定位,并对该部位进行微观检验分... 详细信息

某线路60kg/m U71Mn钢轨服役10个月后,在日常探伤检查作业中发现一处钢轨轨头部位探伤出波,波幅达到100%,判定为轨头内部重伤。为了分析钢轨探伤不合的原因,取探伤不合钢轨试样采用人工复探方式对伤损进行定位,并对该部位进行微观检验分析,发现钢轨轨头表面存在外力造成的冷态形变伤损,伤损面平滑,对超声波形成反射,从而引起探伤异常回波。建议钢轨探伤作业出现探伤不合时,应对钢轨表面状态进行检查,如果出波部位存在表面伤损,应对表面修磨后再进行复探,以排除钢轨表面伤损引起的异常回波。

关键词：钢轨超声波探伤表面伤损缺陷分析

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