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Electropolishing of NiTi for Improving Biocompatibility

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Journal of Materials Science & Technology 2008年第6期24卷 926-930页

作者： Wei WU Xinjie LIU Huimin HAN dazhi yang Shoudong LU State Key Laboratory for Material Modification by Laser Ion and Electron Beams Dalian University of Technology Dalian 116085 China School of Materials Science and Engineering Dalian University of Technology Dalian 116085 China

A modified electrolyte （CH3COOH-HClO4-A-B） for electropolishing （EP） of NiTi was presented for improving the corrosion resistance and biocompatibility of the alloy. Using the proposed parameters, a homogeneous and uniform surface was obtained. Atomic force microscopy （AFM） revealed that the surface roughness （Ra） for EP sample （23.21 nm） was close to mechanical polishing （MP） sample （19.36 nm）. Analysis by X-ray photoelectron spectroscopy （XPS） showed that Ti/Ni ratio increased from 3.1 for MP sample to 27.6 for EP sample. Measurements using potentiodynamic polarization in Hanks＇ solution showed that no pitting occurred for EP sample even though the applied potential increased up to 1500 mV （vs SCE）, while the MP sample was broken down at 650 mV. The present study indicates that electropolishing NiTi with this modified electrolyte contributes to the improved biocompatibility of NiTi.

关键词： NiTi Electropolishing XPS Corrosion resistance Biocompatibility

Roles of mechanosensitive channel Piezo 1/2 proteins in skeleton and other tissues

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Bone Research 2021年第4期9卷 456-472页

作者： Lei Qin Tailin He Sheng Chen dazhi yang Weihong Yi Huiling Cao Guozhi Xiao Department of Orthopedics Huazhong University of Science and Technology Union Shenzhen HospitalShenzhenGuangdongChina Department of Biochemistry School of MedicineGuangdong Provincial Key Laboratory of Cell Microenvironment and Disease ResearchShenzhen Key Laboratory of Cell MicroenvironmentSouthern University of Science and TechnologyShenzhenGuangdongChina Department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubeiChina

Mechanotransduction is a fundamental ability that allows living organisms to receive and respond to physical signals from both the external and internal *** mechanotransduction process requires a range of special proteins termed mechanotransducers to convert mechanical forces into biochemical signals in *** Piezo proteins are mechanically activated nonselective cation channels and the largest plasma membrane ion channels reported thus *** regulation of two family members,Piezol and Piezo2#has been reported to have essential functions in mechanosensation and transduction in different organs and ***,the predominant contributions of the Piezo family were reported to occur in the skeletal system,especially in bone development and mechano-stimulated bone *** we review current studies focused on the tissue-specific functions of Piezol and Piezo2 in various backgrounds with special highlights on their importance in regulating skeletal cell *** this review,we emphasize the diverse functions of Piezol and Piezo2 and related signaling pathways in osteoblast lineage cells and *** also summarize our current understanding of Piezo channel structures and the key findings about PIEZO gene mutations in human diseases.

关键词： mec sensation organs

Application of CoFe_(2)O_(4)-NiO nanoparticle-coated foam-structured material in a high-flux solar thermochemical reactor

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Science China(Technological Sciences) 2023年第11期66卷 3276-3286页

作者： ZHANG Hao ZHANG XiaoMi yang dazhi SHUAI Yong GUENE LOUGOU Bachirou PAN QingHui WANG FuQiang School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China

The splitting of carbon dioxide through the two-step solar thermochemical cycle presents enormous potential,for it holds the dual functionalities of solar fuel production and carbon-based energy ***,the industrialization of this technology is impeded by two critical factors:The absence of fully developed oxygen carriers and advanced reaction devices that deliver exceptional *** order to identify a potentially effective oxygen carrier,50 wt%NiO-modified Co Fe_(2)O_(4)is selected as the active component and characterized by means of thermogravimetry,scanning electron microscopy,and energy dispersive spectroscopy,so as to clarify its oxygen exchange capacity,micromorphology and elemental composition in high-temperature thermochemical ***,nanoparticle-coated foam-structured materials are prepared in combination with Si C ceramic foam for experimental testing in a high-flux solar *** results indicate that a peak CO yield of 1.96 m L min^(-1)g^(-1)can be gained in a 1500–1250 K preliminary test,demonstrating the application potential of the *** contrast to conventional redox materials,the CO_(2)activity of the materials synthesized in this study exhibits an enhancement with rising oxidation *** means that isothermal cycles can potentially achieve higher conversion and fuel yield than non-isothermal cycles,while simultaneously reducing the amount of irreversible heat loss during high-temperature *** the estimated steadystate thermal efficiency of the solar reactor can reach up to 42%,further optimization of the reactor design is necessary to enhance energy conversion efficiency,as it is partially limited by the dimensions of the reaction chamber.

关键词： solar thermochemistry CO_(2)splitting two-step redox cycle iron-base oxygen carrier reactor design

Modification of polycarbonateurethane surface with poly （ethylene glycol） monoacrylate and phosphorylcholine glyceraldehyde for anti-platelet adhesion

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Frontiers of Chemical Science and Engineering 2014年第2期8卷 188-196页

作者： Jing yang Juan LV Bin GAO Li ZHANG dazhi yang Changcan SHI Jintang GUO Wenzhong LI Yakai FENG School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Tianjin University-Helmholtz-Zentrum Geesthacht Joint Laboratory for Biomaterials and Regenerative Medicine Tianjin 300072 China Key Laboratory of Systems Bioengineering Ministry of Education Tianjin University Tianjin 300072 China University of Rostock Department of Cardiac Surgery Reference & Translation Center for Cardiac Stem Cell Therapy Schillingallee 69 D-18057 Rostock Germany

Poly（ethylene glycol） monoacrylate （PEGMA） is grafted onto polycarbonateurethane （PCU） surface via ultraviolet initiated photopolymerization. The hydroxyl groups of poly（PEGMA） on the surface react with one NCO group of isophorone diisocyanate （IPD1） and another NCO group of IPDI is then hydrolyzed to form amino terminal group, which is further grafted with phosphorylcholine glyceraldehyde to establish a biocompatible hydrophilic structure on the surface. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirm the successful grafting of both PEG and phosphorylcholine functional groups on the surface. The decrease of the water contact angle for the modified film is caused by synergic effect of PEG and phosphorylcholine, which both have the high hydrophilicity. Furthermore, the number of platelets adhered is relative low on the synergetically modified PCU film compared with the PCU film modified only by poly（PEGMA）. Our synergic modification method using both PEG and phosphorylcho- line may be applied in surface modification of bloodcontacting biomaterials and some relevant devices.

关键词： poly(ethylene glycol) monoacrylate phos-phorylcholine polycarbonateurethane surface modifica-tion anti-platelet adhesion biomaterials

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不确定环境下危险货物公铁联运路径优化研究

兰州交通大学学报 2024年第3期43卷 28-38页

作者：董佳马昌喜齐博刘又萁杨大志包头铁道职业技术学院铁道交通运营管理系内蒙古包头014060 兰州交通大学交通运输学院兰州730070 西交利物浦大学江苏苏州215123 山东建筑大学交通工程学院济南250101

为使得危险货物公铁联运路径优化更贴合实际,其引入随机机会约束理论,再用决策分析法、理论研究法和算例分析法等,把含有随机变量的不确定式子转换为确定等价形式,考虑集装箱限容、时间窗约束和运输风险等因素,以运输总成本最低、总时... 详细信息

为使得危险货物公铁联运路径优化更贴合实际,其引入随机机会约束理论,再用决策分析法、理论研究法和算例分析法等,把含有随机变量的不确定式子转换为确定等价形式,考虑集装箱限容、时间窗约束和运输风险等因素,以运输总成本最低、总时间最短和总风险最小为目标,建立不确定环境下的危险货物多式联运路径优化模型。基于随机模拟算法、神经元网络算法和遗传算法,设计一种改进的混合智能算法验证模型的可行性和有效性。参数变化分析表明:设计的混合智能算法比普通的启发式算法求解效率高;选用大载货量的集装箱对运输企业和风险管理部门均有益;运输途中人口密度或风险阈值越小,可使危险货物运输风险降低;花费较多财力来达到客户的时效要求,也可提高客户满意度;在途运输时间越长,风险值也就越高。以此为运输企业和管理部门提供基础理论知识和多样化的决策方案。

关键词：危险货物公铁联运不确定环境混合智能算法参数变化分析

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考虑个体感知的公交接驳轨道交通范围确定

交通科技与经济 2024年第3期26卷 45-54页

作者：毕亚茹于晓桦杨大志田雨晗刘欣萍山东建筑大学交通工程学院济南250101

为提高轨道交通与公交接驳的有效性,对轨道交通的站点公交接驳范围进行研究。基于问卷调查数据,分析不同轨道交通段乘行时间场景下个体出行感知分布特征,包括出行心理分布特征和距离衰减特征,确定可接受接驳时间和轨道段乘行时间的相关... 详细信息

为提高轨道交通与公交接驳的有效性,对轨道交通的站点公交接驳范围进行研究。基于问卷调查数据,分析不同轨道交通段乘行时间场景下个体出行感知分布特征,包括出行心理分布特征和距离衰减特征,确定可接受接驳时间和轨道段乘行时间的相关性关系,采用非集计价格敏感度模型计算不同轨道段乘行时间场景下的公交接驳时空阈值。结果表明:可接受的公交接驳时间随轨道段乘行时间增长呈非线性增长,增长速度逐渐变缓,两者之间的关系可用对数模型拟合,R^(2)为0.83;出行者在轨道段乘行10 min、20 min、30 min、40 min、60 min和80 min时,可接受的接驳公交服务范围分别为1.65 km、2.4 km、3.51 km、4.86 km、5.79 km和6.36 km;以济南市地铁2号为例,计算19个轨道车站的公交接驳范围,其中位于城市外围区域的轨道站点公交接驳范围相对较大。

关键词：交通工程公交接驳范围非集计价格敏感度模型轨道段乘行时间个体感知距离衰减模型

A novel sprayable thermosensitive hydrogel coupled with zinc modified metformin promotes the healing of skin wound

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Bioactive Materials 2023年第2期20卷 610-626页

作者： Zhengwei Liu Wanze Tang Jiayi Liu Yingying Han Qinnan Yan Yuechao Dong Xiaomei Liu dazhi yang Guixing Ma Huiling Cao Department of Biochemistry School of MedicineSouthern University of Science and TechnologyGuangdong Provincial Key Laboratory of Cell Microenvironment and Disease ResearchShenzhen Key Laboratory of Cell MicroenvironmentShenzhen518055China Southern University of Science and Technology Shenzhen518055China Department of Biomedical Engineering Southern University of Science and TechnologyShenzhen518055China The First Affiliated Hospital Southern University of Science and TechnologyShenzhen518055China

A novel sprayable adhesive is established(ZnMet-PF127)by the combination of a thermosensitive hydrogel(Pluronic F127,PF127)and a coordination complex of zinc and metformin(ZnMet).Here we demonstrate that ZnMet-PF127 potently promotes the healing of traumatic skin defect and burn skin injury by promoting cell proliferation,angiogenesis,collagen ***,we find that ZnMet could inhibit reactive oxygen species(ROS)production through activation of autophagy,thereby protecting cell from oxidative stress induced damage and promoting healing of skin *** complex exerts better effects on promoting skin wound healing than ZnCl2 or metformin *** complex also displays excellent antibacterial activity against Staphylococcus aureus or Escherichia coli,which could reduce the incidence of skin wound ***,we demonstrate that sprayable PF127 could be used as a new drug delivery system for treatment of skin *** advantages of this sprayable system are obvious:(1)It is convenient to use;(2)The hydrogel can cover irregular skin defect sites evenly in a liquid *** combination with this system,we establish a novel sprayable adhesive(ZnMet-PF127)and demonstrate that it is a potential clinical treatment for traumatic skin defect and burn skin injury.

关键词： Thermosensitive hydrogel Skin wound ZnMet-PF127 Reactive oxygen species(ROS) Autophagy

DRY SLIDING WEAR OF Cu-BASED SHAPE MEMORY ALLOY

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Acta Metallurgica Sinica(English Letters) 1992年第3期5卷 193-198页

作者： WANG Hongwei Dalian University of Technology,Dalian,ChinaWU Wangzi Shenyang Institute of Technology,Shenyang,ChinaWANG Fengting yang dazhi Dalian University of Technology,Dalian,China Dalian Univ of Technology Dalian China

The wear of Cu-based CuZnAl shape memory alloys under dry sliding against steel was found to be plasticity-dominated,with adhesion and delamination being the two main mecha- *** was found to be accompanied by metal *** observation on tensile test of thin foil showed that the stress-induced martensitic transformation occurred from β-phase in the vicinity of pre-existing *** blunt effect of crack tips may be proposed to explain the wear of CuZnAl shape memory alloy due to preferential orientation reaction of variants in martensite and stress-induced martensitic transformation in β-phase.

关键词： CuZnAl allov shape memory alloy wear martensitic transformation

GROWTH OF ISOTHERMAL MARTENSITE IN AN Fe-Ni-Mn ALLOY

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Acta Metallurgica Sinica(English Letters) 1989年第1期2卷 16-21页

作者： yang dazhi ZHU Min Dalian Institute of Technology,Dalian,Liaoning,China. yang dazhi,Professor,Dept.of Mater.Sci.and Eng.,Dalian Institute of Technology,Dalian,Liaoning,China

The substructural development of martensite plates at different stage of the transformation for an Fe-21Ni-4Mn alloy has been investigated by using transmission electron microscope. Twinning was found in small thin platelets at the initial *** twins extend to the whole *** dislocations and twins were found in the thick platelets at a later *** of the twins was also observed frequently at this ***,several platelets coalesce with each other to form a macroscopic(252)_f martensite“plate”.The original habit plane of the individual platelet was measured to be close to(121)_f.

关键词： Fe-Ni-Mn alloy plate martensite isothermal transformation