A joint inversion method is developed to estimate the elastic constants of two elastic, homogeneous, isotropic media separated by a flat horizontal boundary. The method jointly uses P and S-converted wave reflection amplitude-versusangle (AVA) data and seeks the Poisson’s ratios of each layer, ratios of the densities and bulk modulus of the layers. The generalized linear inversion (GLI) method ...

Pulmonary emphysema is a connective tissue disease characterized by the progressive destruction of alveolar walls leading to airspace enlargement and decreased elastic recoil of the lung. However, the relationship between microscopic tissue structure and decline in stiffness of the lung is not well understood. In this study, we developed a 3D computational model of lung tissue in which a pre-st...

SUMMARY We derive exact expressions for the thermal expansivity, heat capacity and bulk modulus assemblages with arbitrarily large numbers of components phases, including influence phase transformations chemical exchange. illustrate results in simple two-component, two-phase systems, Mg–Fe olivine-wadsleyite Ca–Mg clinopyroxene-orthopyroxene a multicompontent model mantle composition form pyrol...

We show that composite materials can exhibit a viscoelastic modulus (Young's modulus) that is far greater than that of either constituent. The modulus, but not the strength, of the composite was observed to be substantially greater than that of diamond. These composites contain bariumtitanate inclusions, which undergo a volume-change phase transformation if they are not constrained. In the comp...

In this work the typical mechanical properties for the catalyst support material, ZSM5 zeolite particles, have been measured in order to relate the bulk behaviour of the powder material to the single particles mechanical properties. Particle shape and size distribution of the powders were determined by laser diffraction and Scanning Electron Microscopy (SEM) confirmed the spherical shape of the...

The structural, mechanical, elastic anisotropic, and electronic properties of Pbca-XN (X = C, Si, Ge) are investigated in this work using the Perdew-Burke-Ernzerhof (PBE) functional, Perdew-Burke-Ernzerhof for solids (PBEsol) functional, and Ceperly and Alder, parameterized by Perdew and Zunger (CA-PZ) functional in the framework of density functional theory. The achieved results for the lattic...

The distribution of elastic stiffness and damping of individual phases in an α + β titanium alloy (Ti-6Al-4V) measured by using atomic force acoustic microscopy (AFAM) is reported in the present study. The real and imaginary parts of the contact stiffness k (*) are obtained from the contact-resonance spectra and by using these two quantities, the maps of local elastic stiffness and the damping ...

The water permeability of the leaves of three deciduous plants (Acer campestre, Fagus sylvatica, Quercus petraea) and two evergreen plants (Hedera helix, Ilex aquifolium) was analysed in order to assess its role as a mechanism of drought resistance. Cuticular permeances were determined by measurement of the water loss through adaxial, astomatous leaf surfaces. Minimum conductances after complet...

This research was conducted to determine how the incorporation of different poroelastic equations would affect measured rock matrix bulk modulus in laboratory. To do this, three experimental methods were used measure modulus, Ks, seven sandstone specimens taken from Świętokrzyskie mine Poland. Those based on governing poroelasticty theory. The has a substantial impact strength against external ...