Liquid foams were recognized early to be porous materials, as liquid flowed between the gas bubbles. Drainage theories have been established, and foam permeability has been modeled from the microscopic description of the equivalent pores geometry, emphasizing similarities with their solid counterparts. But to what extent can the theoretical work devoted to the permeability of solid porous mater...

Foams are complex and challenging materials. The damage process of the foam materials takes place on multiple scales changing several physical and structural properties of the material. In this study, the topology-based variable describing the connectivity state of a cell is introduced to formulate a non-variational phase-field model for the damage evolution in an open-cell foam. The material i...

George E. P. Box wrote, "All models are false, but some models are useful." In that spirit, we examine fractionalflow models for foam enhanced oil recovery (EOR). This approach has long fascinated practitioners by transforming a physics problem first into a mathematics problem and then into a geometry puzzle. This approach, sometimes called the method of characteristics (MOC), makes many seriou...

This paper deals with black holes, bubbles and orbifolds in GaussBonnet theory in five dimensional anti de Sitter space. In particular, we study stable, unstable and metastable phases of black holes from thermodynamical perspective. By comparing bubble and orbifold geometries, we analyse associated instabilities. Assuming AdS/CFT correspondence, we discuss the effects of this higher derivative ...

The optical properties of composite materials are studied theoretically as a function of temperature via a phenomenological model for temperatures up to the melting points of the materials. Both the Maxwell-Garnett and Bruggeman models are considered and the temperature variation of the optical constants of the metallic particles is obtained with an account of the dependence of both the electro...

The change in entropy, DS , at the first-order magnetoelastic phase transition in Gd5(SixGe12x)4 alloys for x<0.5 has been measured with a high-sensitivity differential scanning calorimeter with built-in magnetic field, H. Scaling of DS is achieved by changing the transition temperature, Tt , with x and H from 70 to 310 K. Tt is thus the relevant parameter in determining the giant magnetocalori...

A recently developed long-wavelength continuum phenomenological model is employed to study the phonon tunneling through semiconductor heterostructures where the barrier parameters are varied gradually according to a Gaussian function. The optical modes of a Si/SixGe1Kx Gaussian superlattice are considered. Such structures allow the incident phonons to be nearly totally transmitted when the inci...

Hegel’s Phenomenology of Spirit is knowledge’s voyage of self-discovery. It begins with the mere appearance of knowledge – that is, what knowledge at first seems to be. But what knowledge at first seems to be is not congruent with its reality, even in its first appearance. The incongruence creates an instability that pushes knowledge on to other ways to take itself, stopping only when a concept...

In this article we present a phenomenological model which simulates very well the magnetic relaxation behavior experimentally observed in small magnetic grains and single domain particles. In this model, the occurrence of quantum tunneling of magnetization below a certain temperature is taken into account. Experimental results for different materials are presented to illustrate the most importa...

We propose a general method for modelling transformation paths of multi-phase materials such that elastic moduli can be fitted exactly. The energy landscape obtained in this way is global and automatically enjoys the correct symmetries. The method is applied to the triple point of zirconia, where tetragonal, orthorhombic (orthoI), and monoclinic phases meet. An explicit and relatively simple ex...