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Grain refinement of Mg-alloys by native MgO particles: An overview

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Journal of Magnesium and Alloys 2022年第11期10卷 2919-2945页

作者： Z.Fan F.Gao y.wang S.H.wang J.B.Patel Brunel Centre for Advanced Solidification Technology(BCAST) Brunel University LondonUxbridgeUB83PHUK

A fine and equiaxed solidification process delivers multidimensional benefits to Mg-alloys, such as improved castability, reduced casting defects, enhanced mechanical properties, increased corrosion resistance and potential for increased recycled contents. Despite extensive research on grain refinement of Mg-alloys in the last few decades, currently, there is no effective grain refiner available for refining Mg-Al alloys, and our current understanding of grain refining mechanisms is not adequate to facilitate the development of effective grain refiners.Under the EPSRC(UK) Li ME Hub’s research program, substantial advances have been made in understanding the early stages of solidification covering prenucleation, heterogeneous nucleation, grain initiation and grain refinement. In this paper, we provide a comprehensive overview of grain refinement of Mg-alloys by native MgO particles. We show that native MgO particles can be made available for effective grain refinement of Mg-alloys by intensive melt shearing regardless of the alloy compositions. More importantly, we demonstrate that(1) the addition of more potent exogenous particles will not be more effective than native MgO;and(2) MgO particles are difficult to be made more impotent for grain refinement through promoting explosive grain initiation. We suggest that the most effective approach to grain refinement of Mg-alloys is to make more native MgO particles available for grain refinement through dispersion, such as by intensive melt shearing.

关键词： Mg-alloys Grain refinement Magnesia(MgO) Nucleation Grain initiation

应用诊断超声和微泡对无法手术的胰腺癌病人进行临床超声化疗：一项多中心、开放标签的随机对照试验研究

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国际医学放射学杂志 2024年第3期 373-373页

作者： F.Han y.wang X.Dong Q.Lin y.wang W.Gao 余翔玲

摘要目的超声化疗，即采用微泡（MB）辅助超声（US）递送化疗药物，具有增强肿瘤化疗疗效的潜力。US和MB的联合应用已被证实可以延长胰腺癌病人的生存期。这项2期

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Slip effects on shearing flows in a porous medium

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Acta Mechanica Sinica 2008年第1期24卷 51-59页

作者： M.Khan T.Hayat y.wang Department of Mathematics Quaid-i-Azam University Islamabad 44000 Pakistan Chair of Fluid Dynamics Department of Mechanical Engineering Darmstadt University of TechnologyHochschulstrasse 164289 Darmstadt Germany

This paper deals with the magnetohydrodynamic （MHD） flow of an Oldroyd 8-constant fluid in a porous medium when no-slip condition is no longer valid. Modified Darcy＇s law is used in the flow modelling. The non-linear differential equation with non-linear boundary conditions is solved numerically using finite difference scheme in combination with an iterative technique. Numerical results are obtained for the Couette, Poiseuille and generalized Couette flows. The effects of slip parameters on the velocity profile are discussed.

关键词： Porous medium. Magnetohydrodynamic flow Slip effect

Stresses State and Mechanical Behaviors of the Green Body During Die Compaction and Ejection Process

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 605-614页

作者： S.M.wang y.wang y.X.wang F.P.Liu J.Cao Department of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 15001China

Finite element simulations for metal powder compaction of a clutch plate were performed to examine the stresses during compaction,unloading,and ejection.To describe the mechanical behavior of compacted green body,a modified densitydependent Drucker-Prager Cap model was utilized to predict the stress and density distribution of the compacted clutch plate during loading and ejection stages.The results indicate that maximum tensile principal stress was a main driving force for the tensile crack initiation during ejection stage,and shear stress may be another driving force in both compaction and ejection stages for shear crack initiation.There were peak value of the stresses during ejection stage,and the stresses are in compressive state only during compaction stage.Therefore,the tensile crack initiation is not possible during compaction except shear crack.Hoop stress in the clutch plate is of less contribution to the crack initiation during compaction,unloading and ejection.Study of criteria of the crack initiation and fracture is necessary in order to obtain uniform density and crackfree components in the manufacturing of metal powder compaction.

关键词： Powder compaction Finite element simulation Stress history Cap model Green body

人工智能辅助压缩感知方案在膝关节MR成像中的可行性：一项前瞻性多阅片者研究

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国际医学放射学杂志 2024年第1期 129-129页

作者： Q.Z.wang W.L.Zhao X.y.Xing y.wang P.J.Xin y.y.Chen 陈莉

摘要目的评价人工智能辅助压缩感知（ACS）加速二维快速自旋回波MRI与标准并行成像（PI）在3.0 T快速膝关节扫描中的影像质量和诊断效能。方法该前瞻性研究在

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Flexible and transparent piezoelectric loudspeaker

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npj Flexible Electronics 2021年第1期5卷 198-203页

作者： M.Shehzad S.wang y.wang School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjingJiangsuChina School of Chemical and Materials Engineering National University of Sciences and Technology(NUST)H-12IslamabadPakistan

The simple structure of flexible piezoelectric polymers implies promise innumerous applications,such as transparent loudspeakers.In this study,we fabricated and characterized a prototype loudspeaker device.The loudspeaker was fabricated using a straightforward method of sandwiching a film of copolymer blend between a pair of flexible ITO substrates,which served as top and bottom electrodes.The dependence of acoustic properties of the devices was investigated in accordance with d_(33)and piezoresponse force microscopy(PFM).In this study,we examine the sound pressure level(SPL)and sound intensity(SI)of devices featuring 0.5≤α≤0.9 blends,with an active area of 6.5 cm×5 cm at 100 Vpp applied voltage.Here we report SPL of 96 dB and SI of 3.98mWm^(−2)for anα=0.7 blend at 100 Vpp.Our results are helpful in developing flexible,transparent piezoelectric polymers and in the development of lightweight,transparent loudspeaker devices.

关键词： transparent piezoelectric straight

On the use of deep learning for phase recovery

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Light(Science & Applications) 2024年第2期13卷 190-235页

作者： Kaiqiang wang Li Song Chutian wang Zhenbo Ren Guangyuan Zhao Jiazhen Dou Jianglei Di George Barbastathis Renjie Zhou Jianlin Zhao Edmund y.Lam Department of Electrical and Electronic Engineering The University of Hong KongHong Kong SARChina School of Physical Science and Technology Northwestern Polytechnical UniversityXi’anChina Department of Biomedical Engineering The Chinese University of Hong KongHong Kong SARChina School of Information Engineering Guangdong University of TechnologyGuangzhouChina Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMAUSA

Phase recovery(PR)refers to calculating the phase of the light field from its intensity measurements.As exemplified from quantitative phase imaging and coherent diffraction imaging to adaptive optics,PR is essential for reconstructing the refractive index distribution or topography of an object and correcting the aberration of an imaging system.In recent years,deep learning(DL),often implemented through deep neural networks,has provided unprecedented support for computational imaging,leading to more efficient solutions for various PR problems.In this review,we first briefly introduce conventional methods for PR.Then,we review how DL provides support for PR from the following three stages,namely,pre-processing,in-processing,and post-processing.We also review how DL is used in phase image processing.Finally,we summarize the work in DL for PR and provide an outlook on how to better use DL to improve the reliability and efficiency of PR.Furthermore,we present a live-updating resource(https://***/kqwang/phase-recovery)for readers to learn more about PR.

关键词： networks phase optics

Inside-Out 3D Reversible Ion-Triggered Shape-Morphing Hydrogels

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Research 2019年第1期2019卷 1237-1248页

作者： X.Du H.Cui Q.Zhao J.wang H.Chen y.wang Institute of Biomedical&Health Engineering Shenzhen Institutes of Advanced Technology(SIAT)Chinese Academy of Sciences(CAS)Shenzhen518035China

Shape morphing is a critical aptitude for the survival of organisms and is determined by anisotropic tissue composition and directional orientation of micro-and nanostructures within cell walls,resulting in diferent swelling behaviors.Recent eforts have been dedicated to mimicking the behaviors that nature has perfected over billions of years.We present a robust strategy for preparing 3D periodically patterned single-component sodium alginate hydrogel sheets cross-linked with Ca^(2+)ions,which can reversibly deform and be retained into various desirable inside-out shapes as triggered by biocompatible ions(Na^(+)/Ca^(2+)).By changing the orientations of the patterned microchannels or triggering with Na^(+)/Ca^(2+)ions,various 3D twisting,tubular,and plantinspired architectures can be facilely programmed.Not only can the transformation recover their initial shapes reversibly,but also it can keep the designated shapes without continuous stimuli.Tese inside-out 3D reversible ion-triggered hydrogel transformations shall inspire more attractive applications in tissue engineering,biomedical devices,and sof robotics felds.

关键词： swelling preparing attractive

Response Evaluation Using Contrast-Enhanced Ultrasound for Unresectable Advanced Hepatocellular Carcinoma Treated With Tyrosine Kinase Inhibitors Plus Anti-PD-1 Antibody Therapy

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