Means of controlling induction rheostat parameters in electromagnetic working shaft system

Methods of increasing the driving torques of an electromagnetic working shaft (EMWS) by directly affecting the induction rheostat parameters by connecting the additional rheostats in parallel in the rotor circuit are examined. Original and more precise analytical expressions are obtained for the driving torques of the electromagnetic working shaft. In these expressions, the stator resistance is taken into account for the first time. It is easy to calculate the electromagnetic working shaft performances uainf these expressions and the accuracy of calculations is high.     

Elaboration and characterization of metallic foams based on tin–lead

This study is devoted to the fabrication of metallic foams based on tin–lead of various relative densities and pore sizes by means of the liquid alloy infiltration process and its characterization (mechanical behavior and microstructure). Room temperature uniaxial compression tests were carried out in order to study the influence of the size of cell and of the relative density on the behavior in compression and to interpret these relations within a framework. A characterization on a microscopic scale (metallography and hardness) is achieved in order to link the morphological and mechanical characteristics of the constitutive phases, the parameters of the process and the macroscopic mechanical behavior.     

Contrôle hydrodynamique de l'evaporation d'un film liquide ruisselant sur une paroi isotherme à symétrie de révolution dans un courant d'air humide

A thin-film evaporation from a surface of a axisymmetrical body in a humid air stream was studied using a finite difference method associated with Thomas' algorithm. The surface of the body is supposed isothermal. The variability of physical properties is taken into account, and a steady-state and laminar regime is supposed. The influence of the main parameters of the system on the evaporation is determined, especially the wall profile. It is shown that, for certain conditions of calculation, it is possible to find a flat ellipsoid of revolution offering a uniformly accessible wall between the pole and the equator.     

Virtual reality for fire safety training: study of factors involved in immersive learning

Virtual Reality - For several years, virtual reality (VR) has been increasingly used in many fields, including learning. It has shown many benefits such as increased learner’s safety and...