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Papers by duc chinh

Research paper thumbnail of Polarization versus Mori-Tanaka approximations for effective conductivity of isotropic composites

Vietnam Journal of Mechanics, 2018

Our polarization approximations for the effective conductivity of isotropic multicomponent materi... more Our polarization approximations for the effective conductivity of isotropic multicomponent materials, constructed recently as approximate solutions to the minimum energy principles, are compared with the widely used Mori-Tanaka approximation, derived as an approximate solution of the field equations. The similarities and differences, advantages and disadvantages of both approaches are analysed with illustrating numerical examples.

Research paper thumbnail of Macroscopic uncertainty of the effective properties of random media and polycrystals

Journal of Applied Physics, 2007

The concept of macroscopic properties (conductivity, elasticity,...) of heterogeneous media is re... more The concept of macroscopic properties (conductivity, elasticity,...) of heterogeneous media is reexamined and defined, with the assessment that the effective properties of randomly inhomogeneous materials (in the large representative volume element limit) generally are not unique, but scatter within some uncertainty limits; hence, the statistical homogeneity, statistical isotropy, and ergodicity hypotheses often attributed to them may be considered only as approximations, and random irregular systems may not have definite percolation thresholds. Our formal bounds on the elastic moduli of random polycrystals are used to derive explicit estimates of the uncertainty of the moduli with numerical results for the aggregates of hexagonal and tetragonal crystals of all classes. The results indicate that the macroscopic moduli of many polycrystalline materials are determined within just two or three significant digits—similar to the respective results for the conductivity properties.

Research paper thumbnail of Diagnosis of Intestinal Tuberculosis at Viet Duc Hospital (2004-2009)

surgeons.or.th

Purpose: Gastrointestinal tuberculosis, especially complicated intestinal tuberculosis (ITB) is s... more Purpose: Gastrointestinal tuberculosis, especially complicated intestinal tuberculosis (ITB) is still an ongoing challenge for physicians and radiologists. This study aimed to assess the clinical features and related factors which might help the diagnosis ...

Research paper thumbnail of Improved bounds for the elastic moduli of perfectly-random composites

Journal of Elasticity, 1995

Page 1. Journal of Elasticity 41: 1-12, 1995. 1995 Kluwer Academic Publishers. Primed in the Neth... more Page 1. Journal of Elasticity 41: 1-12, 1995. 1995 Kluwer Academic Publishers. Primed in the Netherlands. Improved Bounds for the Elastic Moduli of Perfectly-Random Composites PHAM DUC CHINH Institute of Mechanics, 224 Doi Can, Hanoi, Vietnam ...

Research paper thumbnail of Polarization versus Mori-Tanaka approximations for effective conductivity of isotropic composites

Vietnam Journal of Mechanics, 2018

Our polarization approximations for the effective conductivity of isotropic multicomponent materi... more Our polarization approximations for the effective conductivity of isotropic multicomponent materials, constructed recently as approximate solutions to the minimum energy principles, are compared with the widely used Mori-Tanaka approximation, derived as an approximate solution of the field equations. The similarities and differences, advantages and disadvantages of both approaches are analysed with illustrating numerical examples.

Research paper thumbnail of Macroscopic uncertainty of the effective properties of random media and polycrystals

Journal of Applied Physics, 2007

The concept of macroscopic properties (conductivity, elasticity,...) of heterogeneous media is re... more The concept of macroscopic properties (conductivity, elasticity,...) of heterogeneous media is reexamined and defined, with the assessment that the effective properties of randomly inhomogeneous materials (in the large representative volume element limit) generally are not unique, but scatter within some uncertainty limits; hence, the statistical homogeneity, statistical isotropy, and ergodicity hypotheses often attributed to them may be considered only as approximations, and random irregular systems may not have definite percolation thresholds. Our formal bounds on the elastic moduli of random polycrystals are used to derive explicit estimates of the uncertainty of the moduli with numerical results for the aggregates of hexagonal and tetragonal crystals of all classes. The results indicate that the macroscopic moduli of many polycrystalline materials are determined within just two or three significant digits—similar to the respective results for the conductivity properties.

Research paper thumbnail of Diagnosis of Intestinal Tuberculosis at Viet Duc Hospital (2004-2009)

surgeons.or.th

Purpose: Gastrointestinal tuberculosis, especially complicated intestinal tuberculosis (ITB) is s... more Purpose: Gastrointestinal tuberculosis, especially complicated intestinal tuberculosis (ITB) is still an ongoing challenge for physicians and radiologists. This study aimed to assess the clinical features and related factors which might help the diagnosis ...

Research paper thumbnail of Improved bounds for the elastic moduli of perfectly-random composites

Journal of Elasticity, 1995

Page 1. Journal of Elasticity 41: 1-12, 1995. 1995 Kluwer Academic Publishers. Primed in the Neth... more Page 1. Journal of Elasticity 41: 1-12, 1995. 1995 Kluwer Academic Publishers. Primed in the Netherlands. Improved Bounds for the Elastic Moduli of Perfectly-Random Composites PHAM DUC CHINH Institute of Mechanics, 224 Doi Can, Hanoi, Vietnam ...

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