Cobalt ferrite nanoparticles (CoFe2O4) are well known for some distinctive characteristics such as high magnetic permeability and coercive force, good saturation magnetization, excellent physical, and chemical stability, which make them so attractive for magnetic storage, magnetic resonance imaging (MRI), drug delivery, optical-magnetic equipment, radar absorbing materials...

Inflow control devices (ICD), which prevent water breakthrough by controlling the inflow profile of a well, have been used successfully in many oilfields. This paper will introduce a new discovery and an unsuccessful example. Moreover, this paper investigates meticulously and thoroughly to find the application conditions of the new discovery. Based on permeability rush coefficient and permeabil...

The effect on dynamo action of an anisotropic electrical conductivity conjugated to magnetic permeability is considered. Not only the fully axisymmetric, but it requires a simple differential rotation, which twice challenges well-established theory. Stability analysis conducted entirely analytically, leading explicit expression threshold. results show competition between anisotropy and that per...

In this research work, an improved two-dimensional semi-analytical subdomain based method for performance computation in IPM machine considering infinite-/finite-magnetic material permeability in pseudo-Cartesian coordinates by using hyperbolic functions has been presented. In the developed technique, all subdomains are divided into periodic or non-periodic regions with homogeneous or non-homog...

This article discusses the calculation of magnetic fields differential scattering stator, passing in radial direction (penetrating body rotor core), taking into account saturation nonlinearities tooth zones circuit. The results method for calculating permeability final values steel sections circuit stator and a salient-pole synchronous motor its spatial harmonic air gap are presented.

Magnetic permeability data of cobalt ferrite and carbonyl iron suspensions are discussed. Using an induction method, the relative differential permeability, mr;dif ; was measured as a function of the internal magnetic field for different volume fractions of the solid phase. In the case of cobalt ferrite suspensions, the mr;dif H curve was obtained for a first increasing ramp of magnetic field (...

The Preisach formalism is used to model magnetic hysteresis loops in soft magnetic materials subject to tensile stress. The model uses the Stoner-Wohlfarth mechanism of coherent rotation and dispersion of easy axes to capture the vector response of the magnetization. The Preisach density is constructed as the weighed sum of normal probability density functions (pdf) for the regions of high and ...

The paper is concerned with the homogenization of a nonlinear differential system describing flow an electrically conducting, incompressible and viscous Newtonian fluid through periodic porous medium, in presence magnetic field. We introduce variational formulation equipped boundary conditions. show existence solution problem, derive uniform estimates solutions depending on characteristic param...

The combined effects of viscous dissipation and Joule heating on unsteady MHD flow over a stretching sheet saturated in porous medium are analyzed. The governing nonlinear coupled partial differential equations are transformed into ordinary coupled differential equations by similarity transformation and solved numerically using Runge-Kutta fourth order method with shooting technique. The study ...