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Effects of Predeformation on the Reverse Martensitic Transformation of TiNi Shape Memory Alloy

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Journal of Materials Science & Technology 2000年第6期16卷 611-614页

作者： Yanjun ZHENG Lishan CUI Fan ZHANG dazhi yang Department of Materials Science and Engineering University of Petroleum Beijing 102200 China Department of Materials Engineering Dalian University of Technology Dalian 116024 China

DSC was used to study the effects of predeformation on the reverse martensitic transformation of near-equiatomic TiNi alloy. Both the start temperature As and the finish temperature Af of the reverse transformation increased with increasing degree of predeformation, but the algebraic difference between As and Af decreased with increasing predeformation until it reached a minimum value, then remained unchanged with further deformation. Transformation heat also increased with increasing predeformation until it reached a maximum value, then decreased with further predeformation. All the phenomena above were considered to be closely related with the release of elastic strain energy during predeformation.

关键词： TiNi Effects of Predeformation on the Reverse Martensitic Transformation of TiNi Shape Memory Alloy

Study on Stress-softening Effect in CuZnAl Shape Memory Alloys

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Rare Metals 1989年第4期9卷 38-43页

作者： Yi, Huchun Qi, Min Wang, Fengting yang, dazhi Dalian Univ of Technology China

The effect of mechanical cyclings on the stress-strain(S-S) curves was studied systematically using tensile tests over a wide temperature range. Two-stage yielding was observed in the temperature range between Ms and the ultimate temperature to induce martensite, denoted by Md. The first stage was confirmed to be associated with stress-induced martensite(SIM) and the second stage was associated with the yielding of SIM. When the samples were mechanically cycled between Ms and Md, a stress-softening phenomenon was observed. The cyclings made the martensite amount increase, critical stress σc of SIM decrease according to exponential law, and the entropy(also enthalpy) of the parent to martensite transformation also decrease. The variations of SIM relative amount were determined by recording the changes of electrical resistances in the course of tension.

关键词： Copper and Alloys Phase Transitions Copper Metallography Martensite Materials with Memory Phase Transitions Metals Testing Tensile Tests Stresses Effects

A Tutorial Review of the Solar Power Curve: Regressions, Model Chains, and Their Hybridization and Probabilistic Extensions

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Advances in Atmospheric Sciences 2024年第6期41卷 1023-1067页

作者： dazhi yang Xiang’ao XIA Martin János MAYER School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Key Laboratory for Middle Atmosphere and Global Environment Observation(LAGEO) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Energy Engineering Faculty of Mechanical EngineeringBudapest University of Technology and EconomicsMűegyetem rkp.3Budapest H-1111Hungary

Owing to the persisting hype in pushing toward global carbon neutrality,the study scope of atmospheric science is rapidly *** numerous trending topics,energy meteorology has been attracting the most attention *** essential skill of solar energy meteorologists is solar power curve modeling,which seeks to map irradiance and auxiliary weather variables to solar power,by statistical and/or physical *** this regard,this tutorial review aims to deliver a complete overview of those fundamental scientific and engineering principles pertaining to the solar power *** power curves can be modeled in two primary ways,one of regression and the other of model *** classes of modeling approaches,alongside their hybridization and probabilistic extensions,which allow accuracy improvement and uncertainty quantification,are scrutinized and contrasted thoroughly in this review.

关键词： review energy meteorology solar power curve model chain solar power prediction

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

Site adaptation with machine learning for a Northern Europe gridded global solar irradiance product

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Energy and AI 2024年第1期15卷 265-278页

作者： Sebastian Zainali dazhi yang Tomas Landelius Pietro Elia Campana Mälardalen University Department of Sustainable Energy SystemsVästerås SE 72123Sweden School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbinHeilongjiangChina Swedish Meteorological and Hydrological Institute Norrköping SE 60176Sweden

Gridded global horizontal irradiance(GHI)databases are fundamental for analysing solar energy applications’technical and economic aspects,particularly photovoltaic ***,there exist numerous gridded GHI databases whose quality has been thoroughly validated against ground-based irradiance ***,databases that generate data at latitudes above 65˚are few,and those available gridded irradiance products,which are either reanalysis or based on polar orbiters,such as ERA5,COSMO-REA6,or CM SAF CLARA-A2,generally have lower quality or a coarser time resolution than those gridded irradiance products based on geostationary *** the high-latitude gridded GHI databases,the STRÅNG model developed by the Swedish Meteorological and Hydrological Institute(SMHI)is likely the most accurate one,providing data across *** further enhance the product quality,the calibration technique called"site adaptation"is herein used to improve the STRÅNG dataset,which seeks to adjust a long period of low-quality gridded irradiance estimates based on a short period of high-quality irradiance *** study introduces a novel approach for site adaptation of solar irradiance based on machine learning techniques,which differs from the conventional statistical methods used in previous *** machine-learning algorithms have been analysed and compared with conventional statistical approaches to identify Sweden’s most accurate algorithms for site *** irradiance data gathered from three weather stations of SMHI is used for training and *** results show that machine learning can substantially improve the STRÅNG model’s ***,due to the spatiotemporal heterogeneity in model performance,no universal machine learning model can be identified,which suggests that site adaptation is a location-dependant procedure.

关键词： Machine learning Global horizontal irradiance STRÅNG Site adaptation Agrivoltaic Sweden

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

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