Show that the flow of electromagnetic energy far from localized, time-dependent sources in a uniform, linear anisotropic dielectric medium is purely radial, despite the complexity of the wavefronts. Thus, the waves are transverse electromagnetic (TEM) in this region, although the electric displacement D has a longitudinal component in general. It suffices to consider sources with time dependenc...

‎The object of the present paper is to study spacetimes admitting‎ ‎quasi-conformal curvature tensor‎. ‎At first we prove that a quasi-conformally flat spacetime is Einstein‎ ‎and hence it is of constant curvature and the energy momentum tensor of such a spacetime satisfying‎ ‎Einstein's field equation with cosmological constant is covariant constant‎. ‎Next‎, ‎we prove that if the perfect flui...

Stroke is a serious healthcare problem with high mortality and long-term disability. However, to date, our ability to prevent and cure stroke remains limited. One important goal in stroke research is to identify the extent and location of lesion for treatment. In addition, accurately differentiating salvageable tissue from infarct and evaluating therapeutic efficacies are indispensible. These o...

Helical flow leads to deformation of solute plumes and enhances transverse mixing in porous media. We present experiments in which macroscopic helical flow is created by arranging different materials to obtain an anisotropic macroscopic permeability tensor with spatially variable orientation. The resulting helical flow entails twisting streamlines which cause a significant increase in lateral m...

Contents 1. Introduction 2 1.1. Porous media 2 1.2. Defining the microstructure 2 1.3. Darcy's law 3 2. Function spaces 4 2.1. Definitions 4 2.2. Some properties 5 3. Pressure as a Lagrange multiplier 5 3.1. A splitting of H 1 0 (Γ) 5 3.2. Finding the pressure 7 4. Solving the Stokes problem 7 5. Technical preliminaries for Darcy's law 9 5.1. The Poincaré inequality in Ω ε 9 5.2. Extension and ...

For the calculationof torque in synchronousmotors a local method is analysed, based on the Maxwell stress theory and the filtered contributions due to the harmonics of the magnetic vector potential in the motor air-gap. By considering the space fundamental field only, the method can efficiently estimate the average synchronous torque for a variety ormotor topologies, including concentratedwindi...

This paper deals with the analysis of different PM machines for hybrid electric vehicles application. The main machine parameters, electromagnetic torque and the skewing effect is investigated using ANSYS program. The model parameters of the PM machines are derived with Fixed Permeability Method (FPM). With this method the components of the PM machine can be calculated with high accuracy. Diffe...