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Breaking Through Bottlenecks for Thermally Conductive Polymer Composites:A Perspective for Intrinsic Thermal Conductivity,Interfacial Thermal Resistance and Theoretics

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Nano-Micro Letters 2021年第7期13卷 118-126页

作者： Junwei Gu Kunpeng ruan MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072P.R.China

Rapid development of energy,electrical and electronic technologies has put forward higher requirements for the thermal conductivities of polymers and their ***,the thermal conductivity coefficient(λ)values of prepared thermally conductive polymer composites are still difficult to achieve expectations,which has become the bottleneck in the fields of thermally conductive polymer *** at that,based on the accumulation of the previous research works by related researchers and our research group,this paper proposes three possible directions for breaking through the bottlenecks:(1)preparing and synthesizing intrinsically thermally conductive polymers,(2)reducing the interfacial thermal resistance in thermally conductive polymer composites,and(3)establish.ng suitable thermal conduction models and studying inner thermal conduction mechanism to guide experimental ***,the future development trends of the three above-mentioned directions are foreseen,hoping to provide certain basis and guidance for the preparation,researches and development of thermally conductive polymers and their composites.

关键词： Thermally conductive polymer composites Intrinsic thermal conductivity Interfacial thermal resistance Thermal conduction models Thermal conduction mechanisms

Nonabelian Gauged Linear Sigma Model

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Chinese Annals of Mathematics,Series B 2017年第4期38卷 963-984页

作者： Yongbin ruan Department of Mathematics University of Michigan Ann Arbor MI 48105 USA.

The gauged linear sigma model （GLSM for sh.rt） is a 2d quantum field theory introduced by Witten twenty years ago. Since then, it has been investigated extensively in physics by hori and others. Recently, an algebro-geometric theory （for both abelian and nonabelian GLSMs） was developed by the author and his collaborators so that he can start to rigorously compute its invariants and check against physical predications. The abelian GLSM was relatively better understood and is the focus of current mathematical investigation. In this article, the author would like to look over the horizon and consider the nonabelian GLSM. The nonabelian case possesses some new features unavailable to the ahelian GLSM. To aid the future mathematical development, the author surveys some of the key problems inspired by physics in the nonabelian GLSM.

关键词： GIT quotient Stability condition GLSM

Strong correlations in two-dimensional transition metal dichalcogenides

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Science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 77-91页

作者： Wei ruan Yuanbo Zh.ng State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai200438China Sh.nghai Research Center for Quantum Sciences Shanghai201315China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai200433China Zh.ngjiang Fudan International Innovation Center Fudan UniversityShanghai201210China Sh.nghai Qi Zhi Institute Shanghai200232China

Since the discovery of graphene,the development of two-dimensional material research has enabled the exploration of a rich variety of exotic quantum phenomena that are not accessible in bulk *** two-dimensional materials offer a unique platform to build novel quantum *** transition metal dichalcogenides,when thinned down to atomic thicknesses,exhibit intriguing physical properties such as strong electron *** study of strongly-correlated phenomena in twodimensional transition metal dichalcogenides has been a major research frontier in condensed matter *** this article,we review recent progress on strongly-correlated phenomena in two-dimensional transition metal dichalcogenides,including Mott insulators,quantum spin liquids,and Wigner *** topics represent a rapidly developing research area,where tremendous opportunities exist in discovering exotic quantum phenomena,and in exploring their applications for future electronic devices.

关键词： two-dimensional materials transition metal dichalcogenide strong correlations

Three-dimensional numerical study of supercritical pressure effect on heat transfer of cryogenic methane

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航空动力学报 2011年第7期26卷 1480-1487页

作者： ruan Bo MEng hua School of Aeronautics and Astronautics Zhejiang University Hangzhou 310027 China)

A three-dimensional numerical study of the turbulent convective heat transfer of the cryogenic methane flowing inside a square engine cooling channel under supercritical pressures was systematically *** results indicate that increasing the fluid pressure results in enhanced heat transfer of the cryogenic methane under supercritical *** the pseudo-critical temperature under a corresponding supercritical pressure,drastic property variations cause heat transfer deterioration and sh.rp wall temperature increase at a high wall heat flux of 7MW/m2.A modified Jackson and hall heat transfer equation,which can be used for supercritical heat transfer calculations of the cryogenic methane,has been successfully establish.d in this paper.

关键词： supercritical heat transfer supercritical pressure regenerative cooling cryogenic methane numerical study

A novel particle tracking algorithm using polar coordinate system similarity

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Acta Mechanica Sinica 2005年第5期21卷 430-435页

作者： Xiaodong ruan Wenfeng Zhao The State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

A new algorithm using polar coordinate system similarity （PCSS） for tracking particle in particle tracking velocimetry （PTV） is proposed. The essence of the algorithm is to consider simultaneously the ch.nges of the distance and angle of surrounding particles relative to the object particle. Monte Carlo simulations of a solid body rotational flow and a parallel sh.aring flow are used to investigate flows measurable by PCSS and the influences of experimental parameters on the implementation of the new algorithm. The results indicate that the PCSS algorithm can be applied to flows subjected to strong rotation and is not sensitive to experimental parameters in comparison with the conventional binary image cross-correlation （BICC） algorithm. Finally, PCSS is applied to images of a real experiment.

关键词： PIV . PTV . Polar coordinate system similarity .Binary image cross-correlation.

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

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Chinese Journal of Chemical Engineering 2021年第4期34卷 324-334页

作者： Xuke ruan Xiao-Sen Li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China CAS Key Laboratory of Gas hydrate Guangzhou 510640China

The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate *** this study,the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous *** experiments of methane hydrate depressurizationinduced dissociation were performed in a 1D high pressure cell filled with glass beads,an improved and valid 1D corescale numerical model was developed to simulate gas *** conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media,which formed the functional form of the hydrate dissociation surface area with porosity,hydrate saturation and the average radius of sand sediment *** the establish.ent of numerical model for depressurizationinduced hydrate dissociation in porous media,the cumulative gas productions were modeling and compared with the experimental data at the different hydrate *** results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area,and the graincoating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation,whereas at higher hydrate saturation,the hydrate dissociation simulation from the porefilling surface area model is more ***,the sensitivity analysis sh.wed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词： Surface area Methane hydrate hydrate dissociation hydrate morphology Depressurization

The CalderSn-Zygmund Decomposition and Interpolation on Weighted hardy Spaces

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Acta Mathematica Sinica,English.Series 2011年第10期27卷 1967-1978页

作者： Zhuo Ping ruan Department of Mathematics Beijing Normal University Beijing 100875 P. R. China

We apply discrete Littlewood Paley Stein theory, developed by han and Lu, to establish.Calderon Zygmund decompositions and interpolation theorems on weighted hardy spaces hp for w C A∞ in both the one-parameter and t... 详细信息

关键词： Calderdn Zygmund decomposition interpolation weighted hardy spaces discrete Little- wood Paley analysis

INTERFACE DEFORMATION ChARACTERISTICS OF BIMETAL FORMIng

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中国有色金属学会会刊：英文版 1998年第1期8卷 35-39页

作者： Peng, Yingh.ng ruan, Xueyu Sh.nghai Jiao Tong Univ Shanghai China

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关键词： bimetal forming interface deformation characteristics frictional element

Unexpected thermal conductivity enhancement in aperiodic superlattices discovered using active machine learning

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npj Computational Materials 2022年第1期8卷 99-105页

作者： Prabudhya Roy Chowdhury Xiulin ruan School of Mechanical Engineering and the Birck Nanotechnology Center Purdue UniversityWest LafayetteIN47907-2088USA

While machine learning(ML)has sh.wn increasing effectiveness in optimizing materials properties under known physics,its application in discovering new physics remains challenging due to its interpolative *** this work,we demonstrate a general-purpose adaptive ML-accelerated search process that can discover unexpected lattice thermal conductivity(κ_(l))enhancement in aperiodic superlattices(SLs)as compared to periodic superlattices,with implications for thermal management of multilayer-based electronic *** use molecular dynamics simulations for high-fidelity calculations ofκ_(l),along with a convolutional neural network(CNN)which can rapidly predictκ_(l)for a large number of *** ensure accurate prediction for the target unknown SLs,we iteratively identify aperiodic SLs with structural features leading to locally enhanced thermal transport and include them as additional training data for the *** identified structures exhibit increased coherent phonon transport owing to the presence of closely spaced interfaces.

关键词： thermal conductivity transport