Aim. To define the character of mutagenic influence of cancer disease on the dielectric relaxation frequency of the water molecules in suspensions and erythrocyte ghosts in diapason of ultrahigh frequencies (UHF).Methods.
Steady magnetohydrodynamic (MHD) flows of suspensions of conducting micro/nanoparticles through a thin tube of a circular cross-section in a transverse constant magnetic field driven by a constant pressure drops at the ends of the tube is studied. The governing MHD system of equations for a viscous incompressible micro/nanofluid in the non-induction approximation is solved with the second order velocity slip boundary condition at the wall of the tube. The material parameters of the fluid are considered as nonlinear functions of the particle concentration according to the mixture models of suspensions and electric conductivity theory. The velocity field, pressure, electric current and magnetic field have been computed as series expansions. The influence of two non-dimensional slip coefficients of the flow rate and wall shear stress is studied. Optimal concentrations of the micro/nanoparticles in the suspensions have been computed from the minimum entropy production condition for different slip conditions, material parameters, magnetic fields and flow regimes (Reynolds and Hartmann numbers).
Abstract. The dielectric theories which used for applications of dielectric spectroscopy to investigate heterogeneous systems, such as particle suspensions, membranes, and tissue are described in this article. The dielectric constant ′ ε , the loss ′′ ε , and the conductivity σ of substances in a broad frequency range (1 Hz to 10 11 Hz), with for using a combination of different method of dielectric spectroscopy applied to identical samples was described. In the present work, we analyze the dispersion regions, commonly found in biological substances and tissue, usually as termed as α , β , δ and γ -dispersions. The nature of the dispersion caused by the membrane of RBCs in the radio frequency spectrum of the dielectric properties of blood which often is ascribed to the motion of bound water molecules is not yet fully understood. Dielectric properties of RBS membrane have been studied by means of the spheroidal model, where the three shells correspond to the double lipid bilayer and the spectrin network of the inner membrane, respectively. Based on the Maxwell-Wagner model and takes into account the morphological parameters of RBS membranes of cells using appropriate approximations the some simple relations was derived. In discussing the dielectric properties of RBS membrane was considered the mathematical model which accurately fit the experimental observations. Such models have obvious applications when characterizing the data and testing it against possible physical theories. Modeling of dielectric permittivity of the erythrocytes membrane as…
IntroductionThe blood represents of heterogeneous material containing water, dissolved organic molecules, macromolecules, ions and soluble matter. The constituents of the blood are highly organized in cellular and subcellular structures forming macroscopic elements. The presence of ions in the blood plays an important role in the interaction with an electric field, providing means for ionic conduction and polarization effects. The ionic charge drift creates conduction currents and as knows as initiates polarization mechanisms through charge accumulation at structural interfaces, which occur at various organizational levels of membranes of cells of blood. Their dielectric properties will thus reflect contributions to the polarization from both structure and composition [1]. A common way to describe dielectric properties of cell of human blood or tissue between 1 Hz and 50 GHz is to fit ColeCole or Cole-Cole-type relaxation models to measurement data [2][3][4][5]. The measurement of dielectric properties of blood is known to be of importance for diagnosis of diseases [6][7][8][9][10][11]. Early studies of dielectric properties of the human erythrocytes are connecting with alternating current in the frequency domain were pioneered at the beginning of this century [12][13][14][15][16]. The frequency dependence of the dielectric properties of the RBC in suspension has been investigated by many scientists [17][18][19][20][21][22][23][24][25][26][27][28]. In the simplest model...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.