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Uncovering the hierarchical clusters in the heat-affected zone of an electron beam weldedα/βtitanium alloy joint

Journal of materials Science & Technology 2024年第7期174卷 120-132页

作者： C.Xu X.H.Shao H.J.Yang m.lv H.Q.Liu X.L.ma Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Suzhou laboratory Suzhou 215028China Department of mechanical Engineering Kyushu UniversityFukuoka 819-0395Japan Bay Area Center for Electron microscopy Songshan Lake Materials LaboratoryDongguan 523808China

Using high-resolution transmission Kikuchi diffraction(TKD)and transmission electron microscopy(TEm),we examined the hierarchical clusters that form in situ in the heat-affected zone(HAZ),which are com-monly referred to as“ghost”structures,of bimodal titanium alloy Ti-5Al-2Sn-2Zr-4mo-4Cr(wt%,TC17).The ghost structures are enriched with Al elements but poor in mo and Cr compared to the surroundingβ*** results show that the ghost structure in middle-HAZ mainly consists ofα_(L)laths with a high-angle grain boundary,which exhibits the classic Burgers orientation relationship(BOR)with the host matrix,while it encircles theα_(P)grains in *** the ghost structure is evidenced to form via in-complete martensitic *** results further confirm that the ghost structure is composed ofαL and tinyβ_(L)laths with BOR,with the former being enriched with Al and poor with Cr and mo,while the latter is the ***,twoα_(L)variant clusters with a check-mark morphology are fre-quently observed viewed along[0001]_(αL)//[110]_(βL)directions,which are dominated by the crystallographic and geometrical relationships betweenαandβ*** on the microstructural characterization,it is hypothesized that the ghost structure is transformed from the initialα_(P)phase,due to the coupling ef-fect of high thermal stress(which induces the formation of a large number of dislocations)and element diffusion caused by sudden temperature increase and plunge cooling in the HAZ during the welding pro-cess.

关键词： TC17 titanium alloy Electron beam welding(EBW) The ghost structure Transmission Kikuchi diffraction(TKD) Transmission electron microscopy(TEm)

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The role of melt cooling rate on the interface between 18R and mg matrix in mg_(97)Zn_(1)Y_(2) alloys

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Journal of magnesium and Alloys 2023年第8期11卷 2883-2890页

作者： Q.Q.Jin X.H.Shao J.m.Li Z.Z.Peng m.lv B.Zhang Y.m.Li X.L.ma materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering Hebei University of Science and TechnologyShijiazhuangHebei 050018China

The role of melt cooling rate on the interface morphology and dislocation configuration between 18R long-period stacking ordered(LPSO)structure and mg matrix in mg_(97)Zn_(1)Y_(2)(at.%)alloys was investigated by atomic-scale HAADF-STEm *** 18R/mg interface is step-like both in the near-equilibrium alloy and non-equilibrium *** cooling rate makes the step size more regular and *** 54R structure can be observed at the interface in the near-equilibrium alloy,and the dislocations are highly ordered.54R and 54R′structure sandwiched by b1 and b2+b3 dislocation arrays,and new dislocation configuration can be detected at the interface in the non-equilibrium alloy,but the dislocations are less ordered.18R/mg interface containing 54R or 54R′in equilibrium width,parallel to the(010)plane,should be most stable based on elastic *** segregation of solute atoms and its strong interaction with dislocations dominate the LPSO/mg interface via diffusion-displacive transformation.

关键词： magnesium alloys Long-period stacking ordered phases Dislocations Interface structure

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In situ TEm investigation of electron irradiation and aging-induced high-density nanoprecipitates in an mg-10Gd-3Y-1Zn-0.5Zr alloy

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Journal of magnesium and Alloys 2024年第5期12卷 1841-1853页

作者： m.lv H.L.Ge Q.Q.Jin X.H.Shao Y.T.Zhou B.Zhang X.L.ma Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China

In-situ electron irradiation and aging are applied to introduce high-density precipitates in an mg-10Gd-3Y-1Zn-0.5Zr(GWZ1031K,wt.%)alloy to improve the *** results show that the hardness of the mg alloy after irradiation for 10 h and aging for 9 h at 250℃ is 1.64 GPa,which is approximately 64% higher than that of the samples before being *** is mainly attributed to γ'precipitates on the basal plane after irradiation and the high-density nanoscale β'precipitates on the prismatic plane after aging,which should be closely related to the irradiation-induced homogenous *** latter plays a key role in precipitation *** result paves a way to improve the mechanical properties of metallic materials by tailoring the precipitation through irradiation and aging.

关键词： mg alloy Electron beam irradiation Hardening Precipitates In-situ TEm

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Hydrothermal synthesis and luminescent properties of spherical LaPO4:Ln3+(Ln3+=Eu3+,Dy3+,Ce3+,Tb3+)

Hydrothermal synthesis and luminescent properties of spheric...

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TEIm2015第六届无机材料结构、性能及测试表征技术研讨会

作者： J.Dai G.C.Li m.lv X.Li 青岛科技大学材料科学与工程学院

In the recent decade,inorganic luminescent materials with controllable morphology have attracted growingattention because of their unique shape-dependent properties,which enable their applications in the fields of catalysis and electrical,optical,and magnetic ***-earth ion-doped lanthanum phosphates are important types of phosphors,because of their extensive applications in photonic devices,photon up-conversion materials,and biological *** this paper,uniform LaPO and LaPO:Ln(Ln=Eu,Dy,Ce,Tb)microspheres have been selectively synthesized via a hydrothermal route,without using any catalyst,surfactant,or template.X-ray diffraction,scanning electron microscopy,transmission electron microscopy,and photoluminescence spectroscopy were used to characterize the phase structure,morphology,and luminescence properties of the as-prepared *** SEm results indicated that as-obtained samples have perfect spherical morphology with narrow size *** LaPO:Lnphosphors show strong light emissions with different colors coming from different activator ions under ultraviolet excitation,which might find potential applications in fields such as light phosphor powders and advanced flat panel displays.

关键词： Hydrothermal synthesis and luminescent properties of spherical LaPO4:Ln

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Thermogravimetric analysis of the hydrolysis of zinc

Thermogravimetric analysis of the hydrolysis of zinc

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第九届全国氢能学术会议

作者： m.lv,J.H.Zhou,W.J.Yang,K.F.Cen Zhejiang University,China

The production of hydrogen via the hydrolysis of zinc has been applied to a two-step water splitting thermochemical cycle using high-temperature solar process *** measurements were conducted on the hydrolysis of zinc to reveal the reaction mechanism and elucidate the influence of heating rate,water partial pressure,total process pressure,and the particle size and purity of zinc on the reaction *** experimental results shows that

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Co-production of hydrogen, oxygen, and electricity via an integrated solar-driven system with decoupled water electrolyzer and Na-Zn ion battery

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Journal of Energy Chemistry 2025年第1期 621-627页

作者： Fei lv Longjie Liu Jiazhe Wu Pengfei Wang Lixia Pan Dengwei Jing Yubin Chen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Combining water electrolysis and rechargeable battery technologies into a single system holds great promise for the co-production of hydrogen （H2） and ***,the design and development of such systems is still in its ***,an integrated hydrogen-oxygen （O2）-electricity co-production system featuring a bipolar membrane-assisted decoupled electrolyzer and a Na-Zn ion battery was established with sodium nickelhexacyanoferrate （NaNiHCF） and Zn2+/Zn as dual redox *** decoupled electrolyzer enables to produce H2and O2in different time and space with almost 100%Faradaic efficiency at 100 mA ***,the charged NaNiHCF and Zn electrodes after the electrolysis processes formed a Na-Zn ion battery,which can generate electricity with an average cell voltage of 1.75 V at 10 m A *** connecting Si photovoltaics with the modular electrochemical device,a well-matched solar driven system was built to convert the intermittent solar energy into hydrogen and electric energy with a solar to hydrogen-electricity efficiency of 16.7%,demonstrating the flexible storage and conversion of renewables.

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Efficacy,safety and treatment satisfaction of transition to a regimen of insulin degludec/aspart:A pilot study

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World Journal of Diabetes 2025年第1期16卷 65-73页

作者： Na Yang Lu lv Shu-meng Han Li-Yun He Zi-Yi Li Yu-Cheng Yang Fan Ping Ling-Ling Xu Wei Li Hua-Bing Zhang Yu-Xiu Li Department of Endocrinology Key Laboratory of Endocrinology of National Health CommissionPeking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Allergy Beijing Key Laboratory of Precision Medicine for Diagnosis and Treatment of Allergic DiseasesNational Clinical Research Center for Dermatologic and Immunologic DiseasesPeking Union Medical College HospitalChinese Academy of Medical SciencesPeking Union Medical CollegeBeijing 100730China

BACKGROUND There is a lack of clinical evidence on the efficacy and safety of transitioning from a thrice-daily pre-mixed insulin or basal-prandial regimen to insulin degludec/aspart(IDegAsp)therapy,with insufficient data from the Chinese *** To demonstrate the efficacy,safety,and treatment satisfaction associated with the transition to IDegAsp in type 2 diabetes mellitus(T2Dm).mETHODS In this 12-week open-label,non-randomized,single-center,pilot study,patients with T2Dm receiving thrice-daily insulin or intensive insulin treatment were transitioned to twice-daily injections of insulin *** doses,hemoglobin A1c(HbA1c)levels,fasting blood glucose(FBG),hypoglycemic events,a Diabetes Treatment Satisfaction Questionnaire,and other parameters were assessed at baseline and *** This study included 21 participants.A marked enhancement was observed in the FBG level(P=0.02),daily total insulin dose(P=0.03),and overall diabetes treatment satisfaction(Pmic events of those who switched to IDegAsp decreased,however,there was no statistically significant *** The present findings suggest that treatment with IDegAsp enhances clinical outcomes,particularly FBG levels,daily cumulative insulin dose,and overall satisfaction with diabetes treatment.

关键词： Insulin degludec/aspart Type 2 diabetes management Basal-bolus insulin therapy Pre-mixed insulin Diabetes treatment satisfaction questionnaire

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A GREEDY ALGORITHm FOR SPARSE PRECISION mATRIX APPROXImATION

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Journal of Computational mathematics 2021年第5期39卷 693-707页

作者： Didi lv Xiaoqun Zhang School of mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240China School of mathematical Sciences MOE-LSC and Institute of Natural SciencesShanghai Jiao Tong UniversityShanghai 200240China

Precision matrix estimation is an important problem in statistical data *** paper proposes a sparse precision matrix estimation approach,based on CLImE estimator and an efficient algorithm GISSP that was originally proposed for li sparse signal recovery in compressed *** asymptotic convergence rate for sparse precision matrix estimation is analyzed with respect to the new stopping criteria of the proposed GISSP ***,numerical comparison of GISSP with other sparse recovery algorithms,such as ADmm and HTP in three settings of precision matrix estimation is provided and the numerical results show the advantages of the proposed algorithm.

关键词： Precision matrix estimation CLImE estimator Sparse recovery Inverse scale space method Greedy methods

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Effects of nozzle and fluid properties on the drop formation dynamics in a drop-on-demand inkjet printing

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Applied mathematics and mechanics(English Edition) 2019年第9期40卷 1239-1254页

作者： A. B. AQEEL m. mOHASAN Pengyu lv Yantao YANG Huiling DUAN State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science Beijing Innovation Center for Engineering Science and Advanced Technology College of Engineering Peking University Beijing 100871 China National University of Sciences and Technology H-12 Islamabad Pakistan Center for Applied Physics and Technology Key Laboratory of High Energy Density Physics and Inertial Fusion Sciences and Application Collaborative Innovation Center of Ministry of Education Peking University Beijing 100871 China

The droplet formation dynamics of a Newtonian liquid in a drop-on-demand (DOD) inkjet process is numerically investigated by using a volume-of-fluid (VOF) method. We focus on the nozzle geometry, wettability of the interior surface, and the fluid properties to achieve the stable droplet formation with higher velocity. It is found that a nozzle with contracting angle of 45° generates the most stable and fastest single droplet, which is beneficial for the enhanced printing quality and high-throughput printing rate. For this nozzle with the optimal geometry, we systematically change the wettability of the interior surface, i.e., different contact angles. As the contact angle increases, pinch-off time increases and the droplet speed reduces. Finally, fluids with different properties are investigated to identify the printability range.

关键词： inkjet printing drop-on-demand (DOD) droplet formation nozzle geometry surface wettability printability range

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THEORETICAL ANALYSES ON DISCRETE FORmULAE OF DIRECTIONAL DIFFERENTIALS IN THE FINITE POINT mETHOD

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Journal of Computational mathematics 2022年第1期40卷 1-25页

作者： Guixia lv Longjun Shen Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.0.Box 8009-26Beijing 100088China

For the five-point discrete formulae of directional derivatives in the finite point method,overcoming the challenge resulted from scattered point sets and making full use of the explicit expressions and accuracy of the formulae,this paper obtains a number of theoretical results:(1)a concise expression with definite meaning of the complicated directional difference coefficient matrix is presented,which characterizes the correlation between coefficients and the connection between coefficients and scattered geometric characteristics;(2)various expressions of the discriminant function for the solvability of numerical differentials along with the estimation of its lower bound are given,which are the bases for selecting neighboring points and making analysis;(3)the estimations of combinatorial elements and of each element in the directional difference coefficient matrix are put out,which exclude the existence of ***,the theoretical analysis results are verified by numerical *** results of this paper have strong regularity,which lay the foundation for further research on the finite point method for solving partial differential equations.

关键词： Finite point method Finite difference Scattered point distribution Discrete directional differentials Theoretical analysis

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