Improvement of the Induction Heating Process by Numerical Simulation for the Semi-finished Products

In the paper we present the numericalsimulation of the electromagnetic phenomena coupledwith the thermal ones when processing the semifinishedproducts made up of non-ferrous alloy,through electromagnetic induction with the purpose toobtain a homogenous heating of the pieces in theshortest time. Maxwell’s equations that describe theheating process through induction, show that theimportant quantity, basically important to determinethe eddy currents induced in the piece, is the intensityof the magnetic field, resulting the electromagneticlosses, due to their transformation in thermal energy.Determining these losses and verifying the quantity ofheat emerged in the piece is also possible by means ofmathematical calculus with the help the numericalmodeling by methods of approximation such as themethod of the finite differences or the finite elementmethod. So far the results of the experiments haveshow that the intensity of the magnetic field for a longinductor is more intense in the center of the inductorand weaker at its extremes. The purpose of thenumerical modeling is to render solution tohomogenize the intensity of the magnetic fieldaccording to the geometry of the inductor

About Electromagnetic and Thermal Phenomena in the Controlled Phase Transformation Melting Process

This paper presents the electromagnetic andthermal phenomena during the melting process, withphase transformation control, of ferromagnetic alloys.The probes cast using this method will have a uniformstructure, without micro-fissures. If the solid’s partgrowth of the molten is controlled, we can stop theprocess that creates solidification centers, thus thematerial structure will be homogenous. A solution forthis matter is given by the control of the solidificationlayer (phase transformation) using forced heating ofthe liquid part with eddy currents and forced cooling ofthe solid part. The evolution of the area with eddycurrents and the cooled one, controls the phasetransformatio

Modeling and Simulating the Process of Superficial Heat Treatment, by Induction

This paper presents aspects of modeling and simulating the superficial heat treatment process, in an electromagnetic field, using specific software for the induction heating process. It presents the modeling of the inductive heating process for a ferromagnetic work piece, using a facility that allows the adjustment of frequency range, so as it becomes adequate for the heat treatment process

Structure, diversity and seasonal dynamics of algal communities, with special attention to diatoms, from "Lacul Dulce" (Lake no.3) -Turda (Cluj county, Romania)

Abstract. Structure, diversity and seasonal dynamics of algal communities, with special attention to diatoms, from "Lacul Dulce" (Lake No. 3) -Turda (Cluj County, Romania). The subject of the present paper is the investigation of the algal communities inhabiting of Lake No. 3 (known as "Lacul Dulce") from Turda, Cluj County. The algal flora of this lake has not yet been investigated. There have been identified 80 algal taxa, belonging to 5 phyla: Cyanoprokaryota (12 taxa), Dinophyta (5 taxa), Bacillariophyta (48 taxa), Euglenophyta (9 taxa) and Chlorophyta (6 taxa). A special attention was paid to the investigation of diatom communities, the group of algae that is the subject of the first author's PhD thesis. The 48 identified diatoms belong to the following 7 families: Thalassiosiraceae, Chaetoceraceae, Fragilariaceae, Achnanthaceae, Naviculaceae, Bacillariaceae and Epithemiaceae. Some aspects regarding community structure, seasonal dynamics, ecological preferences (salinity concentration) were also studied and are discussed in the pape

About Eddy Currents in Induction Melting Processes

In this paper we present a method forcomputing the eddy currents in induction meltingprocesses for non-ferrous alloys. We take intoconsideration the situation when only the crucible ismoving, inside the coils. This fact makes differentialcomputation methods to be hard to apply, because isnecessary to generate a new mesh and a new systemmatrix for every for every new position of the cruciblerelated to the coils. Integral methods cancel thisdrawback because the mesh is generated only for thedomains with eddy currents. For integral methods, themesh and the inductance matrix remain unchangedduring the movement of the crucible; only the free termsof the equation system will change

The de Larosière Report Regarding the new Structure of European System of Financial Supervision

The aim of this study is to present the new architecture of the European financial supervision the necessity of which had been brought into sharp focus by its deficiencies in the current financial crisis. The study presents through the prism of the report edited by the de Larosière Group the main generating elements of the financial crisis, the deficiencies of the risk management, of corporate governance regulations, the lack in applying the regulation framework and in supervision regarding risk management