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Solid solution strengthening of high-entropy alloys from first-principles study

Journal of Materials Science & Technology 2022年第26期121卷 105-116页

作者： H.L.Zhang d.d.Cai x.Sun H.Huang S.Lu Y.Z.Wang Q.M.Hu L.Vitos X.D.Ding State Key Laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China department of Materials Science and Engineering The Ohio State University2041 College RoadColumbusOH 43210United States Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China Applied Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholm SE-10044Sweden

Solid solution strengthening(SSS)is one kind of strengthening mechanisms and plays an important role in alloy design,in particular for single-phase alloys including high-entropy alloys(HEAs).The classical Labusch–Nabarro model and its expansions are most widely applicable to treating SSS of solid solution alloys including both conventional alloys(CAs)and HEAs.In this study,the SSS effects in a series of Febased CAs and HEAs are investigated by using the classical Labusch–Nabarro model and its expansions.The size misfit and shear modulus misfit parameters are derived from first-principles calculations.Based on available experimental data in combination with empirical SSS model,we propose fitting constants(i.e.,the ratio between experimental hardness and predicted SSS effect)for these two families of alloys.The predicted host/alloy family-dependent fitting constants can be used to estimate the hardness of these SSS alloys.General agreement between predicted and measured hardness values is satisfactory for both CAs and HEAs,implying that the proposed approach is reliable and successful.

关键词： Alloys Solid solution strengthening Hardness Size misfit parameter Shear modulus misfit parameter First-principles calculations

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Enhanced mechanical performance of grain boundary precipitation-hardened high-entropy alloys via a phase transformation at grain boundaries

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Journal of Materials Science & Technology 2021年第27期86卷 271-284页

作者： Y.L.Qi L.Zhao x.Sun H.x.Zong X.D.Ding F.Jiang H.L.Zhang Y.K.Wu L.He F.Liu S.B.Jin G.Sha J.Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China

Grain-boundary(GB)precipitation has a significant adverse effect on plasticity of alloys,which easily leads to catastrophic intergranular failure in safety-critical applications under high external loading.Herein,we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger phase transformation of preset non-equiatomic high-entropy solid-solution phase at GBs.This in situ deformation-induced phase transformation at GBs introduces a well-known effect:transformation-induced plasticity(TRIP),which enables an exceptional elongation to fracture(above 38%)at a high strength(above 1.5 GPa)in a GB precipitation-hardened high-entropy alloy(HEA).The present strategy in terms of"local stress concentration-induced phase transformations at GBs"may provide a fundamental approach by taking advantage of(rather than avoiding)the GB precipitation to gain a superior combination of high strength and high ductility in HEAs.

关键词： Non-equiatomic Grain-boundary precipitation High-entropy alloys ductility Transformation-induced plasticity

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A note on diagnosis and performance degradation detection in automatic control systems towards functional safety and cyber security

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Security and Safety 2022年第1期1卷 2-30页

作者： Steven x.ding Institute for Automatic Control and Complex Systems(AKS) University of Duisburg-EssenBismarckstr.81 BB47057 DuisburgGermany

This note addresses diagnosis and performance degradation detection issues from an integrated viewpoint of functionality maintenance and cyber security of automatic control systems.It calls for more research attention on three aspects:(i)application of control and detection uni ed framework to enhancing the diagnosis capability of feedback control systems,(ii)projection-based fault detection,and complementary and explainable applications of projection-and machine learning-based techniques,and(iii)system performance degradation detection that is of elemental importance for today's automatic control systems.Some ideas and conceptual schemes are presented and illustrated by means of examples,serving as convincing arguments for research e orts in these aspects.They would contribute to the future development of capable diagnosis systems for functionality safe and cyber secure automatic control systems.

关键词： diagnosis in automatic control systems Cyber security in industrial cyber physical systems Uni ed framework of control and detection Projection-based diagnosis Explainable application of ML-methods Performance degradation detection

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坐骨神经阻滞缓解新生儿手术切口致切口痛敏化的新机制

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中国疼痛医学杂志 2023年第2期29卷 81-83页

作者： ding x Liao FF Su L 丁绪(译) 杨溪(校) 不详首都医科大学附属北京儿童医院、国家儿童医学中心

坐骨神经阻滞或可预防新生儿损伤引起的再损伤后疼痛反应加剧,目前正在研究之中。脊髓小胶质细胞过度激活、脑源性神经营养因子(brain-derived neurotrophic factor,BdNF)和含有SH2结构域的蛋白酪氨酸磷酸酶2(SHP2)参与新生动物手术切... 详细信息

坐骨神经阻滞或可预防新生儿损伤引起的再损伤后疼痛反应加剧,目前正在研究之中。脊髓小胶质细胞过度激活、脑源性神经营养因子(brain-derived neurotrophic factor,BdNF)和含有SH2结构域的蛋白酪氨酸磷酸酶2(SHP2)参与新生动物手术切口导致的切口痛敏化。然而,坐骨神经阻滞对切口痛敏化的影响及其机制尚不清楚。该研究发现,坐骨神经阻滞可减轻新生儿期切口、成年期再次切口大鼠(nIN-IN)的痛敏反应和脊髓小胶质细胞激活。使用化学遗传学工具激活或抑制脊髓小胶质细胞,能分别模拟或减弱坐骨神经阻滞对痛行为的影响。此外,脊髓背角α-氨基-3-羟基-5-甲基-4-丙酸异恶唑(α-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptor,AMPA)受体Glu A1亚基参与切口痛敏化。在n IN-IN大鼠抑制BdNF或SHP2,阻断了下游分子的上调。在仅新生儿期切口的成年大鼠(nIN)敲减SHP2,可抑制鞘内给予BdNF引起的Glu A1增加。在n IN-IN啮齿类动物抑制小胶质细胞或敲除小胶质细胞的BdNF,可抑制SHP2和Glu A1的上调。此外,坐骨神经阻滞后可下调此三分子表达。BdNF、SHP2或AMPA受体的上调,可减弱坐骨神经阻滞对下游分子、痛行为的缓解作用。小胶质细胞激活可消除坐骨神经阻滞对此三分子的下调。上述结果表明,坐骨神经阻滞通过减少脊髓小胶质细胞激活,下调BdNF/SHP2/含有Glu A1亚基AMPA受体信号通路,从而缓解新生儿期切口致切口痛敏化。因此,坐骨神经阻滞可能是切口痛敏化的一种防治策略。

关键词：坐骨神经阻滞新生儿期手术切口切口痛脑源性神经营养因子小胶质细胞疼痛反应 AMPA受体

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Unveiling the mechanism of non-conventional superconductivity through material genome engineering

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Frontiers of physics 2022年第3期17卷 7-8页

作者： x.-d.xiang department of materials science and engineering and department of physicssouthern university of science and technologyshenzhen 518055china

Studying the complexity of the electronic phase diagram is at the heart of understanding strongly correlated system in general,with high Tc superconductors as the most known examples.High temperature superconductivity has a wide range of application potentials in power transmission,nuclear magnetic resonance,magnetic levitation transportation,aerospace,information and communication technologies,etc.Understanding its mechanism remains a long-standing challenge,due to its complex material structures and interlays among different phases such as charge density wave,antiferromagnetic and superconducting phases.As a result,this has greatly hindered its further development.

关键词： mechanism superconductivity magnetic

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A Model-free Approach to Fault detection of Continuous-time Systems Based on Time domain data

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International Journal of Automation and computing 2007年第2期4卷 189-194页

作者： Steven x. ding Institute of Automatic Control and Complex Systems University of Duisburg-EssenDuisburg 47057Germany

In this paper, a model-free approach is presented to design an observer-based fault detection system of linear continuoustime systems based on input and output data in the time domain. The core of the approach is to directly identify parameters of the observer-based residual generator based on a numerically reliable data equation obtained by filtering and sampling the input and output signals.

关键词： Fault detection linear continuous time-invariant systems time domain data subspace methods observer-based residual generator,

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dose-dependent associations of joint aerobic and muscle-strengthening exercise with obesity:A cross-sectional study of 280,605 adults

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Journal of Sport and Health Science 2023年第2期12卷 186-193页

作者： Jason A Bennie ding ding Katrien de Cocker Physically Active Lifestyles Research Group(USQ-PALs) Centre for Health ResearchUniversity of Southern QueenslandSpringfield CentralQLD 4300Australia Prevention Research Collaboration Sydney School of Public HealthUniversity of SydneySydneyNSW 2006Australia Charles Perkins Centre Epidemiology Unit Charles Perkins CentreUniversity of SydneySydneyNSW 2006Australia

Background:Emerging epidemiological evidence suggests that compared to engaging in 1 activity mode alone,a combination of moderate-tovigorous physical activity(MVPA:brisk walking/jogging,cycling)and muscle-strengthening exercise(MSE:push-ups/sit-ups,using weight machines)has more favorable associations with optimal weight status.However,few studies have examined the dose-dependent and joint associations of MVPA and MSE with obesity.Methods:Based on cross-sectional analyses of the European Health Interview Survey Wave 2(2013-2014),we examined prevalence ratios(PRs)of joint and stratified associations between MVPA(4 categories:(ⅰ)0 min/week,(ⅱ)1-149 min/week,(ⅲ)150-299 min/week,and(ⅳ)≥300 min/week)and MSE(3 categories:(ⅰ)0 day/week,(ⅱ)1 day/week,and(ⅲ)>2 days/week)with body mass index-defined obesity(body mass index of>30.0 kg/m2)using Poisson regression with robust error variance.PRs were examined unadjusted and adjusted for sociodemographic and lifestyle characteristics(e.g.,sex,age,education,income,and smoking status).Results:data were available for 280,456 adults(≥18 years),of which 46,166(15.5%)were obese.The interaction MVPA x MSE guideline adherence was statistically significant for obesity(p≤0.05).The joint MVPA-MSE analysis showed that compared to the reference group(i.e.,no MVPA and no MSE),the PRs followed a dose-dependent pattern,with the lowest observed among those reporting≥150 MVPA min/week and≥1 MSE days/week(PR:0.43;95%confidence interval:0.41-0.46).When stratified across each MVPA strata,the PRs were mostly lower among those engaging in MSE 1 day/week,as compared to those doing MSE≥2 days/week.Conclusion:"There was evidence for a dose-dependent association between joint MVPA-MSE with a reduced prevalence of obesity.Public health strategies for the prevention and management of obesity should recommend both MVPA and MSE.

关键词： Body mass index Epidemiology Public health Resistance exercise

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高脂饮食诱导的肠道微生物代谢障碍对精子发生和精子运动的损害

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中华医学杂志 2020年第26期100卷 2058-2058页

作者： ding N Zhang x Zhang xd 季文(编译) 不详北京协和医院内分泌科

1973至2011年间西方国家男性精子密度快速下降50%以上,且当前无有效治疗方法减缓其下降趋势。越来越多的临床研究及动物实验表明,高脂饮食介导的肥胖、代谢综合征可以重塑肠道菌群,继而影响能量代谢、肠道黏膜屏障、宿主免疫、预防病原... 详细信息

1973至2011年间西方国家男性精子密度快速下降50%以上,且当前无有效治疗方法减缓其下降趋势。越来越多的临床研究及动物实验表明,高脂饮食介导的肥胖、代谢综合征可以重塑肠道菌群,继而影响能量代谢、肠道黏膜屏障、宿主免疫、预防病原菌等生理功能。为了解高脂饮食是否通过肠道菌群影响男性生殖,该研究分别将正常饮食喂养的小鼠肠道菌群移植入6只正常饮食小鼠(组1),高脂饮食喂养的小鼠肠道菌群移植入另外6只正常饮食小鼠(组2)体内,15周后,检测到组2小鼠的精子生成、精子运动、曲细精管内精原干细胞数量、精母细胞数量均显著下降,血液内毒素升高近2倍,但组1小鼠的上述指标无明显改变。

关键词：精子运动高脂饮食精子生成代谢障碍代谢综合征动物实验精子密度肠道微生物

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动脉自旋标记和体素内不相干运动扩散加权成像检测慢性肾病早期肾损伤的能力

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国际医学放射学杂志 2023年第4期 488-489页

作者： W.Mao Y.Q.ding x.Q.ding C.x.Fu B.H.Cao B.Kuehn 易小琦

摘要目的探讨动脉自旋标记（ASL）和体素内不相干运动扩散加权成像（IVIM-dWI）对估计肾小球滤过率（e GFR）正常的慢性肾病（CKd）病人早期肾损伤的鉴别价值。方法

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A Novel Melt Processing for Mg Matrix Composites Reinforced by Multiwalled Carbon Nanotubes

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Journal of Materials Science & Technology 2016年第12期32卷 1303-1308页

作者： H.L.Shi x.J.Wang C.L.Zhang C.d.Li C.ding K.Wu x.S.Hu School of Materials Science and Engineering Harbin Institute of Technology

Carbon nanotubes（CNTs） reinforced Mg matrix composites were fabricated by a novel melt processing.The novel processing consisted of two courses：CNTs pre-dispersion and ultrasonic melt processing.Mechanical ball-milling was employed to pre-disperse CNTs on Zinc（Zn） flakes.Serious CNT entanglements were well dispersed to single CNT or tiny clusters on Zn flakes.The ultrasonic melt processing further dispersed CNTs in the Mg melt,especially tiny CNT clusters.Thus,a uniform dispersion of CNTs was achieved in the as-cast composites.Hot extrusion further improved the distribution of CNTs.CNTs increased both the strength and elongation of the matrix alloy.Notably,the elongation of the matrix alloy was enhanced by 40%.Grain refinement and the pulling-out of CNTs resulted in the evident improvement of ductility for the composites.

关键词： Pre-dispersion Carbon nanotubes Magnesium matrix composites Ultrasonic

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