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Applied Mathematics and Mechanics(English Edition) 2023年第7期44卷 1039-1068页

作者： W.WU M.DANEKER M.A.JOllEY K.T.TURNER l.lu Department of Anesthesiology and Critical Care Medicine Children's Hospital of PhiladelphiaPhiladelphiaPA 19104U.S.A. Division of Pediatric Cardiology Children's Hospital of PhiladelphiaPhiladelphiaPA 19104U.S.A. Department of Chemical and Biomolecular Engineering University of PennsylvaniaPhiladelphiaPA 19104U.S.A. Department of Mechanical Engineering and Applied Mechanics University of PennsylvaniaPhiladelphiaPA 19104U.S.A.

Material identification is critical for understanding the relationship between mechanical properties and the associated mechanical functions.However,material identification is a challenging task,especially when the characteristic of the material is highly nonlinear in nature,as is common in biological tissue.In this work,we identify unknown material properties in continuum solid mechanics via physics-informed neural networks(PINNs).To improve the accuracy and efficiency of PINNs,we develop efficient strategies to nonuniformly sample observational data.We also investigate different approaches to enforce Dirichlet-type boundary conditions(BCs)as soft or hard constraints.Finally,we apply the proposed methods to a diverse set of time-dependent and time-independent solid mechanic examples that span linear elastic and hyperelastic material space.The estimated material parameters achieve relative errors of less than 1%.As such,this work is relevant to diverse applications,including optimizing structural integrity and developing novel materials.

关键词： solid mechanics material identification physics-informed neural network(PINN) data sampling boundary condition(BC)constraint

Dynamic mechanical properties,deformation and damage mechanisms of eutectic high-entropy alloy AlCoCrFeNi_(2.1)under plate impact

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Journal of Materials Science & Technology 2023年第3期134卷 178-188页

作者： S.P.Zhao Z.D.Feng l.X.li X.J.Zhao l.lu S.Chen N.B.Zhang Y.Cai S.N.luo The Peac Institute of Multiscale Sciences ChengduChina Key laboratory of Advanced Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengduChina

Shock compression and spallation of a eutectic high-entropy alloy(HEA)AlCoCrFeNi_(2.1)with lamellar structure are investigated via plate impact loading with free-surface velocity measurements.The as-cast and postmortem samples are characterized with transmission electron microscopy,electron back-scatter diffraction and scanning electron microscopy.An accurate Hugoniot equation of state is determined.Af-ter shock compression to∼12 GPa,both the l1_(2)and B_(2)phases retain their ordered structures.Dense dislocations in the{111}slip planes,stacking faults and deformation twins are found in the l1_(2)phase,along with fewer dislocations in the{110}slip bands in the B(2)phase.Shock-induced deformation twin-ning within the l1_(2)phase of this HEA is observed as a new deformation mechanism under various load-ing conditions.For spallation,both ductile and brittle damage modes are observed.The micro voids and cracks prefer to nucleate at the phase boundaries chiefly,then in the B(2)phase.Under similar shock stress,the spall strength of AlCoCrFeNi_(2.1)HEA is about 40%higher than those of other reported dual-phase HEAs due to the high stability of its semi-coherent phase boundaries.

关键词： High-entropy alloy Hugoniot Spall damage Microstructure

Shock compression and spallation damage of high-entropy alloy Al_(0.1)CoCrFeNi

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Journal of Materials Science & Technology 2022年第33期128卷 1-9页

作者： N.B.Zhang J.Xu Z.D.Feng Y.F.Sun J.Y.Huang X.J.Zhao X.H.Yao S.Chen l.lu S.N.luo Key laboratory of Advanced Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China The Peac Institute of Multiscale Sciences Chengdu 610031China Department of Engineering Mechanics South China University of TechnologyGuangzhou 510641China

Shock compression and spallation damage of a face-center cubic phase high-entropy alloy(HEA)Al_(0.1)CoCrFeNi were investigated via plate impact experiments along with free surface velocity measurements.Postmortem samples were characterized with transmission electron microscopy and electron backscatter diffraction.The Hugoniot equation of state and spall strength at different impact strengths were determined.There exists a power-law relation between spall strength and strain rate.The spall strength of Al_(0.1)CoCrFeNi HEA is about 50%higher than those of previously studied HEAs and comparable to those widely applied structural stainless steels at the same shock stress.Dislocation glide and stacking faults are the important deformation mechanisms in the Al_(0.1)CoCrFeNi HEA.Nanotwins are only observed at high shock stress.Damage in the Al_(0.1)CoCrFeNi HEA is ductile in nature.Voids are nucleated preferentially in grain interiors,and the intragranular voids show a strong dependence on grain boundary misorientation and peak stress.

关键词： Al_(0.1)CoCrFeNi High-entropy alloy Hugoniot Spall damage Microstructure

Modeling biomembranes and red blood cells by coarse-grained particle methods

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Applied Mathematics and Mechanics(English Edition) 2018年第1期39卷 3-20页

作者： H.lI H.Y.CHANG J.YANG l.lu Y.H.TANG G.lYKOTRAFITIS Division of Applied Mathematics Brown University Department of Materials Science and Engineering Massachusetts Institute of Technology Department of Mechanical Engineering University of Connecticut

In this work, the previously developed coarse-grained （CG） particle models for biomembranes and red blood cells （RBCs） are reviewed, and the advantages of the CG particle methods over the continuum and atomistic simulations for modeling biological phenomena are discussed. CG particle models can largely increase the length scale and time scale of atomistic simulations by eliminating the fast degrees of freedom while preserving the mesoscopic structures and properties of the simulated system. Moreover, CG particle models can be used to capture the microstructural alternations in diseased RBCs and simulate the topological changes of biomembranes and RBCs, which are the major challenges to the typical continuum representations of membranes and RBCs. The power and versatility of CG particle methods are demonstrated：through simulating the dynamical processes mvolving significant topological .changes e.g. lipid self-assembly vesicle fusion and membrane budding.

关键词： coarse-grained molecular dynamics,lipid bilayer red blood cell membrane membrane fusion

Optical and thermal performance analysis of aerogel glazing technology in a commercial building of Hong Kong

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能源与人工环境(英文)

能源与人工环境(英文) 2020年第2期1卷 215-223页

作者： C.K.leung l.lu Y.liu H.S.Cheng Jeff H.Tse Department of Building Services Engineering The Hong Kong Polytechnic UniversityZS850Block ZHung HomKowloonHong KongChina College of Civil Engineering Hunan UniversityChangshaHunan 410082China Electrical and Mechanical Services Department HKSARHong KongChina

Improving the thermal insulation of glazing units is a common strategy of reducing building energy use for spacing cooling.This paper newly examined the application of aerogel glazing technology in Hong Kong by the means of laboratory testing and simulation.Nine prototypes of granular aerogel glazing were selected to examine their optical properties,and the measured optical properties of aerogel were used to calculate the total window thermal performance indices.A typical 40-story commercial office building was chosen for energy simulation to compare the thermal performance of aerogel glazing with different glazing technologies in Hong Kong.The results showed that aerogel glazing could achieve the promising reduction of window heat gain up to 57%and cooling energy up to 8.5%compared with double glazing.The heat insulation performance of aerogel glazing is even better than the double glazing with low-E coating in Hong Kong.Therefore,aerogel glazing can be a good alternative of glazing to comply with the existing local Overall Thermal Transfer Value(OTTV)requirement and to reduce the building energy use for space cooling in Hong Kong and other regions.

关键词： Glazing technology Aerogel glazing Building energy saving

高分辨3D FSE增强MRI提高对库欣综合征中垂体微腺瘤的诊断效能

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国际医学放射学杂志 2023年第6期 744-745页

作者： Z.Y.liu B.Hou H.You l.lu l.Duan M.l.li 王倩

摘要目的对比二维快速自旋回波（2D FSE）序列的常规增强MRI(cMRI)和动态增强MRI(dMRI)，评估高分辨三维快速自旋回波（3D FSE）序列的MRI(hrMRI)对垂体微腺瘤

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The enhanced negative thermal expansion in less-oxygen-vacancies copper pyrophosphate

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Journal of Materials Science & Technology 2023年第15期146卷 80-85页

作者： l.lu Xie T.Fei Shi J.Chao lin X.Kai Zhang X.Kang Zhong K.Ke liu B.Ke Dong Cheng Yang X.lian Wang T.Jiao Xiong W.Sheng Yan J.Ping Xu H.Can Chen Wen Yin Ming li Peng Tong W.Hai Song Y.Ping Sun Key laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Anhui Province Key laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of SciencesHefei 230031China Spallation Neutron Source Science Center Dongguan 523803China Department of Chemistry University of Warsaw02093 WarsawPoland National Synchrotron Radiation laboratory University of Science and Technology of ChinaHefei 230029China

For oxides,controlling the concentration of oxygen vacancy is a useful way to optimize their functional properties.However,when it comes to the field of negative thermal expansion(NTE),much less attention has been paid to the effect of oxygen vacancy on NTE,though oxide-typed NTE materials account for more than 40%of the total NTE materials.Here,we report that the linear coefficient of thermal expansion at 250–350 K of copper pyrophosphate(i.e.,Cu_(2)P_(2)O_(7))can be significantly improved from–13.88 to–36.60 ppm/K when the synthesis temperature is raised from 1073 to 1373 K.The combined study including X-ray absorption near edge structure,neutron powder diffraction,and X-ray diffraction has confirmed the selective vacancies in the O1 site for low-temperature synthesized samples,which suppress both the phase-transition and framework-structure driven NTE simultaneously.Our result proposes a new approach for optimizing the NTE effect of oxides.

关键词： Negative thermal expansion XANES Oxygen vacancy Oxide lattice distortion Phase transition

Dynamic fracture of carbon nanotube-epoxy composites under high strain-rate loading

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Dynamic fracture of carbon nanotube-epoxy composites under h...

Material flow analysis and global warming potential assessment of an industrial insect-based bioconversion plant using housefly larvae

第十三届全国物理力学学术会议

作者： B.X.Bie J.H.Han l.lu X.M.Zhou H.J.Huang Z.Zhang S.N.luo School of Science Wuhan University of Technology The Peac Institute of Multiscale Sciences National Center for Nanoscience and Technology CAS Key laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of China

We investigate dynamic fracture of three types of multiwalled carbon nanotube(CNT)-epoxy composites and neat epoxy under high strain-rate loading(105-106 s-1).The composites include randomly dispersed,1 wt\%,functionalized and pristine CNT-epoxy composites,as well as laminated,0 wt\%CNT-epoxy composites.The pristine and functionalized CNT composites demonstrate spall strength and fracture

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Journal of Environmental Sciences 2024年第5期139卷 483-495页

作者： Tao lu Fan lü Nanlin liao Honghui Chai Hua Zhang Pinjing He Institute of Waste Treatment and Reclamation Tongji UniversityShanghai 200092China State Key laboratory of Pollution Control and Source Reuse Tongji UniversityShanghai 200092China Zhejiang Qihe Ecological Technology Co. Ltd.Hangzhou 310052China

The significant increase in the demand for biomass waste treatment after garbage classification has led to housefly larvae treatment becoming an attractive treatment option.It can provide a source of protein while treating biomass waste,which means that nutrients can be returned to the natural food chain.However,the performance of this technology in terms of its environmental impacts is still unclear,particularly with regards to global warming potential(GWP).This study used a life cycle assessment(lCA)approach to assess a housefly larvae treatment plant with a treatment capacity of 50 tons of biomass waste per day.The lCA results showed that the 95% confidence intervals for the GWP in summer and winter were determined to be 24.46-32.81 kg CO_(2) equivalent(CO_(2)-eq)/ton biomass waste and5.37-10.08 kg CO_(2)-eq/ton biomass waste,respectively.The greater GWP value in summer is due to the longer ventilation time and higher ventilation intensity in summer,which consumes more power.The main GWP contributions are from(1)electricity needs(accounting for 78.6% of emissions in summer and 70.2%in winter)and(2)product substitution by mature housefly larvae and compost(both summer and winter accounting for 96.8% of carbon reduction).

关键词： Biomass waste Musca domestica Housefly larvae life cycle assessment Global warming potential

影像组学机器学习特征诊断肝硬化伴未定性结节病人的肝细胞癌

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国际医学放射学杂志 2020年第2期 247-247页

作者： F.Z.Mokrane l.lu A.Vavasseur P.Otal J.M.Peron l.luk 高珍 Radiology Department Rangueil University Hospital

目的采用三期CT扫描提取的定量特征提高医生对肝硬化伴未定性肝结节病人肝细胞癌(HCC)诊断的决策水平。材料与方法回顾性分析27所医院178例肝硬化病

关键词：影像组学肝结节肝硬化未定性结节病机器学习肝细胞癌