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Žilina, Slovakia

Balog P.,Technical University of Kosice | Brezinova J.,Technical University of Kosice | Pastorek P.,Univerzity of Zilina
Materials Science Forum | Year: 2015

Lap joints are most used joints in automotive industry. These types of welds are usually created by spot welding, but new technologies who came to automotive industry considerably do weld process faster. Paper deals with laser welding parameters and their influence of weld seams. The parameters of welding are readjusting according to shape of weld, impurities of surface and gap. Steel S500MC with thickness of 1.0 and 2.2 mm was used as the base material. For welding was used fiber laser Ytterbium Laser System YLS with power of 6000 watt from IPG Company. Research was oriented on changing weld parameters and their influence of welds quality. It was found that butt welding joints are sensitive to gap and the gap tolerances which in turn is dependent on material thickness, beam diameter, welding speed and beam quality. © (2015) Trans Tech Publications, Switzerland. Source


Faktorova D.,Univerzity of Zilina | Savin A.,National Institute of Research and Development for Technical Physics | Grimberg R.,National Institute of Research and Development for Technical Physics
Journal of Electrical Engineering | Year: 2012

Microwave nondestructive testing methods become nowadays ever more exploited electromagnetic evaluation method not only die-lectric but also metal materials surface and volume homogeneity. A novel microwave sensor created from open waveguide with metamaterial structure for non-destructive testing was developed in an attempt to increase the sensitivity of the microwave nonde-structive evaluation method for detection of defects in metal and dielectric materials. In the paper we describe the new approach with implementation of metamaterial structure with negative permittivity and negative permeability over the open waveguide sen-sor in order to increase the gain and achieve the optimal radiation pattern of designed waveguide sensor with metamaterial struc-ture in microwave X-band. © 2012 FEI STU. Source


Sladek A.,Univerzity of Zilina | Bruna M.,Univerzity of Zilina
70th World Foundry Congress 2012, WFC 2012 | Year: 2012

This article is focused on reoxidation processes during filtration of aluminium alloys. Many of our experimental works pointed out, that using filtration media placed in gating system causes reoxidation of poured aluminium alloy. Main aim of our latest work was to validate our arguments, that filter in gating system can be considered as obstacle for continuous pouring, with help of computer simulations. This article is only a small part of our researches focused on reoxidation processes during filtration of aluminium alloys. Source


Kalasova A.,Univerzity of Zilina | Kuculjakova J.,Univerzity of Zilina
Transport Problems | Year: 2012

Traffic is a key-factor in modern economics. Despite of this, there is a continual conflict between mobility satisfaction and increased delay. Nowadays, many specialists are trying to find out the reasons why some traffic events occur. ITS are systems which help to make efficient use of road and urban communication network, using information, communication and directing technologies. They make basic conditions for high quality communication and information society that we are approaching also in our country. We have to remember that, according to current statistics 93% of traffic accidents are caused by human error. Assistance systems are the main challenge. They are based on communication (data exchange) not only among vehicles themselves but also vehicles and infrastructure. These so called Intelligent Assistance Systems promise great benefits in the sphere of efficiency of transport systems and road safety. These benefits include mainly increase in the capacity of the road network congestion and pollution reduction, shorter and more predictable driving time, improving traffic safety for all participants of road traffic, lower operational costs of vehicles, better organization and management of road network. In this paper, I first review all the available techniques for communication between various vehicles among themselves and with the infrastructure. The aim of this is to have a complete overview of all the possible communication techniques that the world of electronics and telecommunications has proposed in the last years that can be applied for accomplishing the task of enabling vehicles to communicate and interact with other vehicles as well as with the infrastructure. Source


Kvet M.,Univerzity of Zilina | Vajsova M.,Univerzity of Zilina | Matiasko K.,Univerzity of Zilina
Studies in Computational Intelligence | Year: 2015

Cancer is one of the most serious problem of current medicine. Effective diagnostics and proper treatment brings the possibility for patients to become healthy. Global management of MRI results—processing, visualizing is the main part of the developed project. Moreover, these data must be stored effectively to monitor the progress over the time. This document describes the principles of processing, detecting and storing data in column level temporal system with emphasis on index structures. © Springer International Publishing Switzerland 2016. Source

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