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Nano-phase transformation of composite precipitates in multicomponent Al-Mg-si(-sc)alloys

journal of Materials science & Technology 2022年第15期110卷 216-226页

作者： s.B.Wang C.F.Pan B.Wei X.Zheng Y.X.Lai j.h.Chen Key Laboratory of LCR Materials and Devices of Yunnan Province National Center for International Research on Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China Collaborative Innovation Center of Renewable Energy Materials and Department of Physics Guangxi UniversityNanning 530004China Center for high-Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China

sc-addition can significantly enhance the performance of the micro-alloyed Al-Mg-si-sc ***,the mechanisms by which the sc element modifies the microstructure of the alloys are still unknown in many ***,using atomic-scale transmission electron microscopy and atomic-resolution spectroscopy,we have revealed the microstructural differences between two age-hardened Al-0.5Mg-0.4si(wt.%)alloys with and without *** first significant effect of sc-addition on the precipitation microstructure of the Al-Mg-si-sc alloy is that sc-atoms may distribute at theβ"-precipitate/Al-matrix interface and therefore accelerate aging kinetics at the initial stage of *** second significant effect of sc-addition is that in the transition from theβ"-hardened peak-age stage to theβ′-hardened late stage,sc-atoms can greatly improve the stability of transitionalβ"/B'/β′composite precipitates by entering the B'-substructures and/or locating at the precipitate/Al *** such sc-atoms effectively suppressβ"toβ'transformation and cross-sectional coarsening of bothβ"and composite precipitates,leading to much finer precipitate needles with smaller diameter but much larger length,as compared with those precipitate needles formed in the alloy without ***,the alloy with sc-addition exhibits a much better thermal stability than that without sc.

关键词： Al alloy strengthening mechanism Phase transition Transmission electron microscopy

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A portable X-pinch design for x-ray diagnostics of warm dense matter

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Matter and Radiation at Extremes 2022年第1期7卷 53-63页

作者： j.strucka j.W.D.halliday T.Gheorghiu h.horton B.Krawczyk P.Moloney s.Parker G.Rowland N.schwartz s.stanislaus s.Theocharous C.Wilson Z.Zhao T.A.shelkovenko s.A.Pikuz s.N.Bland Plasma Physics Group Imperial College LondonLondon SW72BWUnited Kingdom University of Cambridge CambridgeUnited Kingdom Department of Nuclear Plasmaand Radiological EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Lebedev Physical Institute Russian Academy of SciencesMoscow 119991Russia

We describe the design and x-ray emission properties(temporal,spatial,and spectral)of Dry Pinch I,a portable X-pinch driver developed at Imperial College *** Pinch I is a direct capacitor discharge device,30033003700 mm3 in size and∼50 kg in mass,that can be used as an external driver for x-ray diagnostics in high-energy-density physics *** key findings,the device is shown to reliably produce 1.1±0.3 ns long x-ray bursts that couple∼50 mj of energy into photon energies from 1 to 10 *** average shot-to-shot jitter of these bursts is found to be 10±4.6 ns using a combination of x-ray and current *** spatial extent of the x-ray hot spot from which the radiation emanates agrees with previously published results for X-pinches-suggesting a spot size of 10±6μm in the soft energy region(1–10 keV)and 190±100μm in the hard energy region(>10 keV).These characteristics mean that Dry Pinch I is ideally suited for use as a probe in experiments driven in the laboratory or at external facilities when more conventional sources of probing radiation are not *** the same time,this is also the first detailed investigation of an X-pinch operating reliably at current rise rates of less than 1 kA/ns.

关键词： energy diagnostics pinch

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A new nano-scale surface marking technique for the deformation analysis of Mg-based alloys

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journal of Magnesium and Alloys 2022年第9期10卷 2398-2403页

作者： Y.h.huang s.W.Xu W.N.Tang j.F.Nie Department of Materials science and Engineering Monash UniversityVictoria 3800Australia Automotive steel Research Institute Research Institute(R&D Centre)Baowu Iron&Steel Co.Ltd.Shanghai 201900China Received

In this work a new nanoscale surface marking technique,namely electron beam damage induced surface marking(EBDIsM),is developed and tested for the first time on a fine-grained pure Mg *** technique utilizes focused high-energy electron beam of a scanning electron microscope to“burn”dense arrays of nano-scale grid patterns on the sample surface,and it is proved to be very effective for identifying and measuring localised deformation ***,the surface marking deposited by EBDIsM is not permanent and it tends to deteriorate ***,easy to use and versatile,the EBDIsM technique has a huge potential for quantitative measurement of strain field and nano-scale deformation analysis.

关键词： Magnesium alloy Fine grain structure Deformation analysis surface patterning Deformation field

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Plasma density measurement and downstream etching of silicon and silicon oxide in Ar/NF3 mixture remote plasma source

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Plasma science and Technology 2019年第6期21卷 52-57页

作者： h j YEOM D h ChOI Y s LEE j h KIM D j sEONG s j YOU h C LEE Korea Research Institute of standards and science(KRIss) Daejeon 34113 Republic of Korea Department of Physics Chungnam National University Daejeon 34134 Republic of Korea

In this study,plasma density measurements were performed near the plume region of the remote plasma source (RPs) in Ar/NF3 gas mixtures using a microwave cutoff *** measured plasma density is in the range of 1010-1011 cm-3 in the discharge conditions with RPs powers of 2-4 kW and gas pressures of 0.87-4 *** plasma density decreased with increasing gas pressures and RPs powers under various Ar/NF3 mixing *** decrease in the plasma density measured at the fixed measurement position (plume region) can be understood by the reduction of the electron energy relaxation length with increases in the gas pressures and mixing ratio of NF3/(Ar/NF3).We also performed downstream etching of silicon and silicon oxide films in this *** etch rate of the silicon films significantly increases while the silicon oxide is slightly etched with the gas pressures and *** was also found that the etch rate strongly depends on the wafer position on the processing chamber electrode,and that the etch selectivity reached 96-131 in the discharge conditions of RF powers (3730-4180 W) and gas pressures (3.6-4 Torr).

关键词： remote plasma source electron density cutoff probe downstream etch

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Insensitivity of a turbulent laser-plasma dynamo to initial conditions

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Matter and Radiation at Extremes 2022年第4期7卷 50-64页

作者： A.F.A.Bott L.Chen P.Tzeferacos C.A.j.Palmer A.R.Bell R.Bingham A.Birkel D.h.Froula j.Katz M.W.Kunz C.-K.Li h-s.Park R.Petrasso j.s.Ross B.Reville D.Ryu F.h.séguin T.G.White A.A.schekochihin D.Q.Lamb G.Gregori Department of Physics University of OxfordOxfordUnited Kingdom Department of Astrophysical sciences University of PrincetonPrincetonNew Jersey 08544USA Department of Physics and Astronomy University of RochesterRochesterNew York 14627USA Laboratory for Laser Energetics University of RochesterRochesterNew York 14623USA school of Mathematics and Physics Queens University BelfastBelfastUnited Kingdom Rutherford Appleton Laboratory ChiltonDidcotUnited Kingdom Department of Physics University of StrathclydeGlasgowUnited Kingdom Massachusetts Institute of Technology CambridgeMassachusetts 02139USA Lawrence Livermore National Laboratory LivermoreCalifornia 94550USA Max-Planck-Institut für Kernphysik HeidelbergGermany Department of Physics School of Natural SciencesUNISTUlsanSouth Korea Department of Physics University of NevadaRenoNevada 89557USA Department of Astronomy and Astrophysics University of ChicagoChicagoIllinois 60637USA

It has recently been demonstrated experimentally that a turbulent plasma created by the collision of two inhomogeneous,asymmetric,weakly magnetized,laser-produced plasma jets can generate strong stochastic magnetic fields via the small-scale turbulent dynamo mechanism,provided the magnetic Reynolds number of the plasma is sufficiently *** this paper,we compare such a plasma with one arising from two pre-magnetized plasma jets whose creation is identical save for the addition of a strong external magnetic field imposed by a pulsed magnetic field *** investigate the differences between the two turbulent systems using a Thomson-scattering diagnostic,x-ray selfemission imaging,and proton *** Thomson-scattering spectra and x-ray images suggest that the external magnetic field has a limited effect on the plasma dynamics in the *** the external magnetic field induces collimation of the flows in the colliding plasma jets and although the initial strengths of the magnetic fields arising from the interaction between the colliding jets are significantly larger as a result of the external field,the energies and morphologies of the stochastic magnetic fields post-amplification are *** conclude that,for turbulent laser-plasmas with supercritical magnetic Reynolds numbers,the dynamo-amplified magnetic fields are determined by the turbulent dynamics rather than the seed fields or modest changes in the initial flow dynamics of the plasma,a finding consistent with theoretical expectations and simulations of turbulent dynamos.

关键词： turbulent initial stochastic

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术中麻醉方法对全膝置换术后镇痛效果和吗啡使用的影响:一项网状荟萃分析

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临床骨科杂志 2024年第1期27卷 136-136页

作者： YOO j D hUh M h LEE s h 胡孔足(摘译) 不详

作者使用网状荟萃分析方法,纳入40项研究。结果发现,切口周围浸润麻醉结合隐神经阻滞麻醉对全膝置换患者术后第1、2天镇痛效果最好,对术后第1、3天吗啡需要量最少。股神经阻滞麻醉术后第3天镇痛效果最好,布比卡因神经阻滞麻醉术后第2天... 详细信息

作者使用网状荟萃分析方法,纳入40项研究。结果发现,切口周围浸润麻醉结合隐神经阻滞麻醉对全膝置换患者术后第1、2天镇痛效果最好,对术后第1、3天吗啡需要量最少。股神经阻滞麻醉术后第3天镇痛效果最好,布比卡因神经阻滞麻醉术后第2天吗啡需要量最少。

关键词：神经阻滞麻醉浸润麻醉荟萃分析镇痛效果布比卡因术中麻醉全膝置换吗啡

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γ"variant-sensitive deformation behaviour of Inconel 718 superalloy

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journal of Materials science & Technology 2022年第31期126卷 169-181页

作者： R.Y.Zhang h.L.Qin Z.N.Bi Y.T.Tang j.Araújo de Oliveira T.L.Lee C.Panwisawas s.Y.Zhang j.Zhang j.Li h.B.Dong Centre of Excellence for Advanced Materials Dongguan 523808China school of Engineering University of LeicesterUniversity RoadLeicester LE17RHUnited Kingdom Beijing Key Laboratory of Advanced high Temperature Materials Central Iron and Steel Research InstituteBeijing 100081China Department of Materials University of OxfordParks RoadOxford OX13PHUnited Kingdom stressMap Engineering and Innovation DepartmentThe Open UniversityWalton HallMilton Keynes MK76AAUnited Kingdom IsIs Neutron source Rutherford Appleton LaboratoryHarwell Science and Innovation CampusChiltonOxfordshire OX110QXUnited Kingdom school of Material science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

strengthening in Inconel 718 superalloy is derived from dislocation interaction withγ"precipitates,which exist in disk-shaped three possible orientation variants with their{100}habit plane normal to each *** interactions between dislocations andγ"precipitates vary according to theγ"orienta-tion variants,which makes the deformation behaviour complicated and difficult to reveal *** this work,γ"variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive ***γ"variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room *** is demonstrated that yield-ing first takes place in grains oriented withparallel to the loading *** identical lattice strain response to applied stress of both theγmatrix and theγ"precipitates was observed during yield-ing,suggesting that dislocations shearing through theγ"precipitates is predominant at this ***-ations in yield strength for samples with differentγ"variant distributions were observed,which can be attributed to different strengthening that arises from interactions between dislocation and differentγ"variants.

关键词： Ni-base superalloys Precipitation strengthening Neutron diffraction Lattice strains Plastic deformation

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左心室熵是冠状动脉粥样硬化病人主要不良心血管事件的新型预测指标：一项多中心研究

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国际医学放射学杂志 2024年第4期 499-499页

作者： W.X.Wang Y.Gao j.Wang M.X.Liu h.Gu X.s.Yuan 代静文

摘要目的探讨左心室熵在大型多中心冠状动脉粥样硬化性心脏病（CAD）人群中的不良事件预测价值。目前对CAD病人的风险分层缺乏足够的精准性。方法纳入2015年

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EZh2 inhibitors promote β-like cell regeneration in young and adult type 1 diabetes donors

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signal Transduction and Targeted Therapy 2024年第2期9卷 679-692页

作者： Keith Al-hasani safiya Naina Marikar harikrishnan Kaipananickal scott Maxwell jun Okabe Ishant Khurana Thomas Karagiannis julia j.Liang Lina Mariana Thomas Loudovaris Thomas Kay Assam El-Osta Epigenetics in human health and Disease Program Baker Heart and Diabetes Institute75 Commercial RoadMelbourne 3004 VICAustralia Department of Diabetes Central Clinical SchoolMonash UniversityMelbourne 3004 VICAustralia Epigenetics in human health and Disease Laboratory Central Clinical SchoolMonash UniversityMelbourne 3004 VICAustralia school of science STEM CollegeRMIT UniversityMelbourne 3001 VICAustralia Immunology and Diabetes Unit St Vincent’s Institute of Medical ResearchFitzroy 3065 VICAustralia Department of Medicine and Therapeutics The Chinese University of Hong KongSha TinHong Kong SAR hong Kong Institute of Diabetes and Obesity Prince of Wales HospitalThe Chinese University of Hong Kong3/F Lui Che Woo Clinical Sciences Building30-32-Ngan Shing StreetSha TinHong Kong SAR Li Ka shing Institute of health sciences The Chinese University of Hong KongSha TinHong Kong SAR Biomedical Laboratory science Department of TechnologyFaculty of HealthUniversity College CopenhagenCopenhagenDenmark

β-cells are a type of endocrine cell found in pancreatic islets that synthesize,store and release *** type 1 diabetes(T1D),T-cells of the immune system selectively destroy the insulin-producingβ-*** of these cells leads to a lifelong dependence on exogenous insulin administration for ***,there is an urgent need to identify novel therapies that stimulateβ-cell growth and induceβ-cell *** and others have shown that pancreatic ductal progenitor cells are a promising source for regeneratingβ-cells for T1D owing to their inherent differentiation *** transcriptional suppression is refractory to exocrine reaction and tightly controls the regenerative potential by the EZh2 *** the present study,we show that transient stimulation of exocrine cells,derived from juvenile and adult T1D donors to the FDAapproved EZh2 inhibitors GsK126 and Tazemetostat(Taz)influence a phenotypic shift towards aβ-like cell *** transition from repressed to permissive chromatin states are dependent on bivalent h3K27me3 and h3K4me3 chromatin *** EZh2 is fundamental toβ-cell regenerative *** pancreatic ductal cells exhibit insulin production and secretion in response to a physiological glucose challenge ex *** pre-clinical studies underscore the potential of small molecule inhibitors as novel modulators of ductal progenitor differentiation and a promising new approach for the restoration ofβ-like cell function.

关键词： EZh2 struction inhibitors

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Two-dimensional atomically thin Pt layers on MXenes: The role of electronic effects during catalytic dehydrogenation of ethane and propane

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Nano Research 2024年第3期17卷 1251-1258页

作者： Zhe Li Tobias K.Misicko Fan Yang Xiaopeng Liu Zhenwei Wu Xiaoyang Gao Tao Ma jeffrey T.Miller Daniela s.Mainardi Collin D.Wick Zhenhua Zeng Yang Xiao Yue Wu Department of Chemical and Biological Engineering Iowa State University618 Bissell RoadAmesIA 50011USA Institute for Micromanufacturing Louisiana Tech University505 Tech DriveRustonLA 71272USA Davidson school of Chemical Engineering Purdue University480 Stadium Mall DriveWest LafayetteIN 47907USA Michigan Center for Materials Characterization University of Michigan2800 Plymouth RdAnn Arbor MI 48109USA College of Engineering and science Louisiana Tech UniversityRustonLA 71272USA

Atomically thin Pt nanolayers were synthesized on the surface of Mo2TiC2 MXenes and used for the catalytic dehydrogenation of ethane and propane into ethylene and propylene,two important chemicals for the petrochemical *** compared with Pt nanoparticles,the atomically thin Pt nanolayer catalyst showed superior coke-resistance(no deactivation for 24 h),high activity(turnover frequencies(TOFs)of 0.4–1.2 s^(-1)),and selectivity(>95%)toward ethylene and *** unique Pt nanolayer has a similar geometric surface to Pt nanoparticles,enabling the investigations of the electronic effect on the catalytic performance,where the geometric effect is *** is found that the electronic effect plays a critical role in dehydrogenative product selectivity and catalyst *** metal–support interaction is found dependent on the substrate and metal components,providing wide opportunities to explore high-performance MXene-supported metallic catalysts.

关键词： MXene catalysis alkane dehydrogenation nanolayers

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