The paper deals with the problem of determining the stator end winding inductance of A.C. machines. It refers to the two-layer windings with shortened pitch, the relative pitch being less than one. The inductance has been determined by numerical analysis based on finite elements method (FEM), the procedure being described in this paper. In or...

By Olivian Chiver, Liviu Neamt, Cristian Barz, Eleonora Pop, Cristinel Costea, Zoltan Erdei

 In order to model natural phenomena, a faithful model describing the evolution of the analyzed phenomena must consider as many aspects as possible. An advantage of a correct representation of the studied phenomenon is the highlighting of the aspects hard to notice initially. To support these affirmations, two examples are brought into attenti...

By Ciornei Florina-Carmen, Cristian Barz, Stelian Alaci, Ionut-Cristian Romanu, Bogdan-Ion Dragoi

 Steganography is a technique of hiding secret information into an innocent looking container. Although a large number of steganography techniques exist, there is a constant need for new ones because they have a relatively short lifespan, being constantly defeated by steganalysis methods. Least Significant Bit substitution (LSB) is one of the ...

By Ovidiu Cosma

In this article we obtain some numerical results for the considered problem u'' - u' + (-u^2 + 1)e^(-1/(1+u)) = 0 on [0,1] u'(0) - u(0) = 0u'(1) = 0 This problem arises from the theory of adiabatic tubular chemical reactors. To solve the problem from above we applied a common fixed point result for non-deceasing and weakly increasing operators i...

By Horvat-Marc Andrei, Ioana Tașcu-Stavre

The magnetic field of a closed loop of conductive wire can be computed due to Biot-Savart law, which analyses the value of the field at an exterior point from the transversal axis. If the measure point is out of the axis then the magnetic field has completely different values. A general stated form of this law can measure the value in any point, in...

By Iuga Bogdan, Radu-Adrian Tirnovan

In this paper we present a technological problem encountered in the machining accuracy of the parts for aerospace, made of aluminium alloy extruded profile with 7 meters length. Those parts have very tight tolerances and on milling process appear deviation due to thermal expansion effect, that influence the repeatability of machining processes. Thr...

By Stefan Adrian Moldovan, Vasile Nasui, Marius Cosma

The wide application of various regulators in automated control systems of technological objects determines the necessity to solve problems of constructing optimal, adaptive and with expanded functional capabilities of technological controllers. The toolkit for constructing technological controllers is Simatic S7 hardware devices (PLC S7-1200, Freq...

By Mykola Nykolajchuk

This paper proposes new models and possible strategies for revitalization of Romanian railways. Based on the analysis of the issues of rail infrastructure, freight and passengers transportation, there have been identified solutions for future direction in order to solve the main problems of this sector. There have been analysed, also, various finan...

By Stet Mihaela

The subject of the research are the demographic changes determined by the changes that have occured in the technical, technological, economic, social, health and cultural development of Bosnia and Herzegovina and its entities. The aim of the research is to define the concepts needed for understanding the process of demographic aging and to explore ...

By Milan Šušić

The aim of this paper is to establish some convergence theorems for a Krasnoselskii type fixed point iterative method defined by means of the concept ofadmissible perturbation introduced in [Rus, I. A., An abstract point of view on iterative approximation of fixed points, Fixed Point Theory 13 (2012), No. 1, 179–192] for an asymptotically pse...

By Cristina Ticala