检索结果-南通市图书馆

Microstructures and mechanical properties of a commercial Mg-Al-Zn-Mn alloy with various hot-extrusion processes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1329-1336页

作者： He Ma Fan-Zhi Meng Qiang Yang Ze-Feng Xie Yuan-Ding Huang Xin Qiu State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun130022China magic-Magnesium Innovation Center Helmholtz-Zentrum Geesthacht21502GeesthachtGermany Engineering Research Center of Optoelectronic Functional Materials Ministry of EducationChangchun University of Science and TechnologyChangchun130022China

Mg-Al-Zn-Mn(AZ)system alloys have become widely used due to their good castability,excellent formability and outstanding corrosion resistance[1-6].However,their strength is still much lower than that of traditional Mg... 详细信息

关键词： alloys alloy corrosion

Adiposity in Chinese people with type 1 diabetes

在线全文

学校读者我要写书评

暂无评论

World Journal of Diabetes 2024年第7期15卷 1404-1408页

作者： Nian-Wei Wu Xia-Fei Lyu Zhen-Mei An She-Yu Li Department of Endocrinology and Metabolism West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Radiology West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Guideline and Rapid Recommendation Chinese Evidence-based Medicine CenterCochrane China Center and MAGIC China CenterWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

Adiposity,synonymous with obesity,is prevalent among both children and adults with type 1 diabetes in *** literature underscored the pathophysiological and socioeconomic factors associated with adiposity,and consistently highlighted its impact on cardiovascular,kidney,and metabolic diseases among Chinese individuals with type 1 *** and managing adiposity in individuals with type 1 diabetes are complicated and entail comprehensive approaches including lifestyle modifications,cognitive-behavioral therapy,insulin dose titration,and other diabetes treatment *** condition calls for coordination among policymakers,researchers,clinicians,and patients.

关键词： Type 1 diabetes China Metabolic syndrome Obesity Anti-obesity medications

时间-事件结局证据合成中时间的效应修饰作用

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国循证医学杂志 2024年第3期24卷 364-372页

作者：邹昕雨李舍予四川大学华西医院内分泌与代谢科成都610041 四川大学华西医院中国循证医学中心/magic中国中心/Cochrane中国中心成都610041

时间-事件结局是临床研究中重要的结局类型。在预后因素研究中进行时间-事件结局的效应分析时,时间的效应修饰作用的处理较为复杂,且容易被忽视。在一些临床场景中,时间的效应修饰作用可能对临床决策产生巨大影响。本文阐述了如何在时间... 详细信息

时间-事件结局是临床研究中重要的结局类型。在预后因素研究中进行时间-事件结局的效应分析时,时间的效应修饰作用的处理较为复杂,且容易被忽视。在一些临床场景中,时间的效应修饰作用可能对临床决策产生巨大影响。本文阐述了如何在时间-事件结局存在时间的效应修饰作用时,使用恰当的方法进行证据合成。

关键词：效应修饰单个患者数据 Meta分析时间-事件结局时间依存性协变量时间依存性系数

Serum 25-hydroxyvitamin D,genetic susceptibility,and the risk of incident type 2 diabetes:A prospective cohort in East China

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第8期137卷 972-979页

作者： Ying Sun Haojie Zhang Bin Wang Yuying Wang Chi Chen Yi Chen Yingli Lu Ningjian Wang Institute and Department of Endocrinology and Metabolism Shanghai Ninth People’s HospitalShanghai JiaoTong University School of MedicineShanghai 200011China Department of Endocrinology and Metabolism and Department of Guideline and Rapid Recommendation Cochrane China CenterMAGIC China CenterChinese Evidence-Based Medicine CenterWest China HospitalSichuan UniversityChengduSichuan 610041China Department of Endocrinology Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghai 201203China

Background:The serum vitamin D level varies widely by population,and studies have linked vitamin D levels with the risk of type 2 diabetes mellitus(T2DM).However,the relationship is inconsistent and the impact of vitamin D on T2DM among East Chinese adults is *** study aimed to investigate the association between serum 25-hydroxyvitamin D(25[OH]D)levels and the risk of T2DM and evaluated whether the association is modified by genetic ***:In the Survey on Prevalence in East China for Metabolic Diseases and Risk Factors(SPECT-China)cohort,1862 participants free of T2DM at baseline were included.A weighted genetic risk score was calculated with 28 variants associated with *** logistic models were used to examine the association of serum 25(OH)D and genetic risk with ***:After a 5-year follow-up,132 cases of T2DM were *** observed no significant association between quartiles of serum 25(OH)D and T2DM risk after multivariable adjustment(χ^(2)=0.571,P_(for trend)=0.426).Compared to those in the lowest quartile of 25(OH)D,the odds ratios(ORs)(95%confidence interval[CI])for participants with increased quartiles were 1.29(0.74-2.25),1.35(0.77-2.36),and 1.27(0.72-2.24),*** observed a positive association of glycated hemoglobin(HbA1c)with 25(OH)D at baseline(β=1.752,P=0.001)and after follow-up(β=1.385,P=0.003),and a negative association of ln conversion homeostasis model assessment(HOMA)-βwith 25(OH)D at baseline(β=-0.982,P=0.021).There was no significant interaction between 25(OH)D and diabetes genetic predisposition on the risk of T2DM(χ^(2)=2.710,P_(for interaction)=0.100).The lowest OR(95%CI)of T2DM was among participants with low genetic risk and the highest quartile of 25(OH)D(0.17[0.05-0.62]).Conclusion:Serum 25(OH)D may be irrelevant to the risk of incident T2DM among East Chinese adults regardless of genetic predisposition.

关键词： Vitamin D Diabetes mellitus,Type 2 Genetic predisposition to disease Prospective cohort Glycated hemoglobin SPECT-China

Recycling of magnesium drive train components

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第1期52卷 148-154页

作者： Daniel FECHNER Carsten BLAWERT Norbert HORT Karl Ulrich KAINER magic-Magnesium Innovation Centre GKSS Research Centre Max-Planck-Straβe 1

With the development of new heat resistant magnesium alloys, the automotive industry has introduced several parts to the drive train. The rising number of large magnesium components will result in a higher quantity of automotive post consumer scrap. It was the aim of this work to find a reasonable alloy system for the recycling of these magnesium drive train components. A matrix of potential recy-cling alloys based on the magnesium alloy AM50 was prepared via permanent mould casting. The materials were investigated via tensile testing, creep tests and salt spray tests. Three alloys were selected for processing via high pressure die casting and the tests were repeated on the new materials. A promising system for recycling has been isolated and will be investigated more deeply for the influence of impurities.

关键词： magnesium recycling end-of-life vehicles recycling alloy post consumer scrap

Effects of Gd solutes on hardness and yield strength of Mg alloys

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2018年第6期28卷 724-730页

作者： Yuling Xu Felix Gensch Zhen Ren Karl Ulrich Kainer Norbert Hort magic-Magnesium Innovation Center Helmholtz-Zentrum Geesthacht TU Berlin Forschungszentrum Strangpressen China North Material Science and Engineering Technology Group

Relative contribution of individual strengthening mechanisms to the yield strength of Mg–0–15 wt%Gd alloys were *** with different grain size were prepared by adding Zr and hot *** and tensile/compression yield strength were tested on the alloys after solid solution treatment and *** constants were calculated with hardness and tensile/compressive *** results showed that the hardness of Mg–Gd alloys with similar Gd content and different grain size were almost the same,which indicates that grain size had little effect on *** hardness linearly increased with rising Gd content(d Hv/dc≈25 kg mm-2/at%Gd).The tensile and compressive yield strengths enhanced with the increase of Gd content for all alloys in different *** addition,the tensile/compressive(t/c)yield asymmetry of extruded alloys decreased with increasing Gd *** t/c yield asymmetry ratio(1.77)was observed for pure Mg,and with increasing Gd content this value decreased to *** the increasing of tensile strength,the stress intensity factor,ky,decreased from 0.27 MPa m1/2for Mg–2 wt%Gd alloy to 0.19 MPa m1/2for Mg–5 wt%Gd alloy,then increased to 0.29 MPa m1/2for Mg–15 wt%Gd ***,kyincreased linearly form 0.16–0.31 MPa for compression *** influence of grain size strengthening was eliminated,and the yield strength of tension and compression both linearly increased with cn,where c is the atom concentration of Gd,and n=1/2 or 2/3.

关键词： Mg–Gd alloy Solid solution strengthening Hardness Yield strength

Influence of secondary phases of AlSi9Cu3 alloy on the plasma electrolytic oxidation coating formation process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第15期47卷 75-85页

作者： Ting Wu Carsten Blawert Mikhail LZheludkevich magic-Magnesium Innovation Centre Helmholtz-Zentrum Geesthacht21502 GeesthachtGermany Institute of Materials Science Faculty of EngineeringKiel UniversityKaiserstrasse 224143 KielGermany

To understand the formation and growth of plasma electrolytic oxidation(PEO) coatings in presence of different secondary phases in a substrate,PEO treatment was carried out on AlSi9 Cu3 alloy at different treatment times ranging from 15 s to 480 *** coating formation and evolution process was traced by surface and cross-sectional observation of the layers on the different phases of the *** results demonstrated a sequential involvement of the different phases in the plasma discharges:firstly,discharges start on the α-Al matrix,then on the intermetallic Al2 Cu and β-Al5 FeSi phases at the same time and finally on the eutectic *** presence of intermetallic Al2 Cu remarkably affects the initial dissolution,the deposition of conversion products and the ignition of discharges at the early stages of *** Si in the substrate exhibits the highest electrochemical stability at all stages and contributes in the beginning to a distinct coating morphology *** resultant PEO coating tends to be uniform if processing times are longer and a double-layer structure appears in the coating.

关键词： Plasma electrolytic oxidation Aluminum alloy Secondary phases

Clarifying the influence of albumin on the initial stages of magnesium corrosion in Hank's balanced salt solution

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第3期9卷 805-817页

作者： Di Mei Cheng Wang Sviatlana V.Lamaka Mikhail L.Zheludkevich Magnesium Innovation Centre-magic Institute of Materials ResearchHelmholtz-Zentrum GeesthachtGeesthacht 21502Germany Institute for Materials Science Faculty of EngineeringKiel UniversityKiel 24103Germany

The corrosion behavior of Mg,a promising biodegradable metallic material,in protein-containing pseudophysiological environment is still not fully *** this work,the influence of albumin on the corrosion behavior of commercially pure magnesium(CP Mg)is investigated during short-term tests in Hank’s Balanced Salt Solution(HBSS).This work focuses on the reactions at the Mg/medium interface from the perspective of the interactions among albumin,media components and *** evolution tests demonstrate that the physiological amount of albumin(40 g L^(-1))accelerates Mg corrosion in HBSS during the first few hours but slows down the degradation *** presence of albumin decreases the concentration of free Ca^(2+)in HBSS and delays formation of protective co-precipitation products on Mg *** evolution of local pH(differs from typically monitored bulk pH)near Mg/medium interface in albumincontaining HBSS is reported for the first *** of local and bulk pH values elucidates the pH buffering effect of albumin during the immersion *** on these results,adsorption,chelating and pH buffering effects are summarized as three important aspects of albumin influence on Mg ***,constant replenishment of medium components is shown to be an influential factor during the Mg corrosion tests.

关键词： Magnesium Corrosion Albumin Biodegradable Local pH

Recent research and developments on wrought magnesium alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2017年第3期5卷 239-253页

作者： Sihang You Yuanding Huang Karl Ulrich Kainer Norbert Hort magic-Magnesium Innovation Centre Helmholtz-Zentrum GeesthachtMax-Planck-Str.1D-21502 GeesthachtFederal Republic of Germany

Wrought magnesium alloys attract special interests as lightweight structural material due to their homogeneous microstructure and enhanced mechanical properties compared to as-cast *** this contribution,recent research and developments on wrought magnesium alloys are reviewed from the viewpoint of the alloy design,focusing on Mg-Al,Mg-Zn and Mg-rare earth(RE)*** effects of different alloying elements on the microstructure and mechanical properties are described considering their strengthening mechanisms,*** refinement,precipitation and texture hardening ***,the new alloy design and also the future research of wrought magnesium alloys to improve their mechanical properties are discussed.

关键词： Wrought magnesium alloys Alloy design Mechanical properties