This paper examined how microstructure influences the homogenized thermal conductivity of cellular structures and revealed a surface-induced size-dependent effect.This effect is linked to the porous microstructural fe...This paper examined how microstructure influences the homogenized thermal conductivity of cellular structures and revealed a surface-induced size-dependent effect.This effect is linked to the porous microstructural features of cellular structures,which stems from the degree of porosity and the distri-bution of the pores.Unlike the phonon-driven surface effect at the nanoscale,the macro-scale surface mechanism in thermal cellular structures is found to be the microstructure-induced changes in the heat conduction path based on fully resolved 3D numerical simulations.The surface region is determined by the microstructure,characterized by the intrinsic length.With the coupling between extrinsic and intrinsic length scales under the surface mechanism,a surface-enriched multiscale method was devel-oped to accurately capture the complex size-dependent thermal conductivity.The principle of scale separation required by classical multiscale methods is not necessary to be satisfied by the proposed multiscale method.The significant potential of the surface-enriched multiscale method was demon-strated through simulations of the effective thermal conductivity of a thin-walled metamaterial struc-ture.The surface-enriched multiscale method offers higher accuracy compared with the classical multiscale method and superior efficiency over high-fidelity finite element methods.展开更多
在早期中国思想的研究中,神(deities)、灵(spirit)及其内涵变迁是一个聚讼纷纭的问题。不同的语境中意涵各异的神、灵及其诠释不仅是一个概念研究的课题,也是一个古典思想研究的方法论问题。并不一定存在着一个划一的类型学框架来说明...在早期中国思想的研究中,神(deities)、灵(spirit)及其内涵变迁是一个聚讼纷纭的问题。不同的语境中意涵各异的神、灵及其诠释不仅是一个概念研究的课题,也是一个古典思想研究的方法论问题。并不一定存在着一个划一的类型学框架来说明神、灵及其相关语汇的意涵。与之相对,神灵以及与之相关的一组语词在传统思想文本中的使用是多线索并行的、互不统属的、非结构化和线索性的。这些语词在不同文本中的意义之间并不存在着一种自觉的连贯性和结构性,恰恰相反,它们的意涵是随事变化的。以一种类型学或线索性框架形成的对“神灵”意义的诠释是一种全局性预设的结果。“随事变化”(varying with changing contexts)的理解进路一方面提出“全局性”和“词典式”预设在思想史和观念研究中可能存在的问题,另一方面也尝试进一步探究以经验边缘的独特叙述方法为经验世界及其秩序奠基的描述性方法,以及它对于理解早期中国思想可能的方法论意义。展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2021YFB1714600)the National Natural Science Foundation of China(Grant No.52175095)the Young Top-Notch Talent Cultivation Program of Hubei Province of China.
文摘This paper examined how microstructure influences the homogenized thermal conductivity of cellular structures and revealed a surface-induced size-dependent effect.This effect is linked to the porous microstructural features of cellular structures,which stems from the degree of porosity and the distri-bution of the pores.Unlike the phonon-driven surface effect at the nanoscale,the macro-scale surface mechanism in thermal cellular structures is found to be the microstructure-induced changes in the heat conduction path based on fully resolved 3D numerical simulations.The surface region is determined by the microstructure,characterized by the intrinsic length.With the coupling between extrinsic and intrinsic length scales under the surface mechanism,a surface-enriched multiscale method was devel-oped to accurately capture the complex size-dependent thermal conductivity.The principle of scale separation required by classical multiscale methods is not necessary to be satisfied by the proposed multiscale method.The significant potential of the surface-enriched multiscale method was demon-strated through simulations of the effective thermal conductivity of a thin-walled metamaterial struc-ture.The surface-enriched multiscale method offers higher accuracy compared with the classical multiscale method and superior efficiency over high-fidelity finite element methods.
文摘在早期中国思想的研究中,神(deities)、灵(spirit)及其内涵变迁是一个聚讼纷纭的问题。不同的语境中意涵各异的神、灵及其诠释不仅是一个概念研究的课题,也是一个古典思想研究的方法论问题。并不一定存在着一个划一的类型学框架来说明神、灵及其相关语汇的意涵。与之相对,神灵以及与之相关的一组语词在传统思想文本中的使用是多线索并行的、互不统属的、非结构化和线索性的。这些语词在不同文本中的意义之间并不存在着一种自觉的连贯性和结构性,恰恰相反,它们的意涵是随事变化的。以一种类型学或线索性框架形成的对“神灵”意义的诠释是一种全局性预设的结果。“随事变化”(varying with changing contexts)的理解进路一方面提出“全局性”和“词典式”预设在思想史和观念研究中可能存在的问题,另一方面也尝试进一步探究以经验边缘的独特叙述方法为经验世界及其秩序奠基的描述性方法,以及它对于理解早期中国思想可能的方法论意义。
