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Bjelovar, Croatia

Samardzic I.,Josip Juraj Strossmayer University of Osijek | Cikic A.,Technical college in Bjelovar
Metalurgija | Year: 2013

This paper presents accelerated weldability investigation after weld thermal cycle simulation of TStE 420 steel. The method enables single cycle or multiple cycle thermal simulation of base material specimens and obtaining any point in the heat-affected zone (HAZ) of a welded joint. After weld thermal simulation, an investigation of mechanical properties on treated specimens (hardness, toughness...) is foreseen, based on which it is possible to determine weak points in HAZ of a welded joint and inference regarding to base metal weldability. Source

Petrovic I.,Technical college in Bjelovar | Simic Z.,University of Zagreb | Vrazic M.,University of Zagreb
Przeglad Elektrotechniczny | Year: 2013

The object of this research is to compare three of the most popular conventional analytical models used for estimation of electrical energy production of photovoltaic panels. From this analysis a single model will be selected with the best characteristics for implementation of modifications and corrections in order to get better energy production prediction results. Monthly and annual production results and errors will be the main criteria for the selection of a single model. Single prediction results of the selected model should be as accurate as possible in the smallest time periods, which are in this case monthly energy prediction results. This should guarantee that annual results are also rather accurate. Source

Cikic A.,Technical college in Bjelovar | Samardzic I.,Josip Juraj Strossmayer University of Osijek | Stoic A.,Josip Juraj Strossmayer University of Osijek
Tehnicki Vjesnik | Year: 2013

Dehydration of hygroscopic materials, especially fruit (blueberries, blackberries, raspberries, etc.) and some types of vegetables in vacuum dehydrators by means of radiation at low temperatures preserves their original quality and medicinal value. Experimental research has been carried out, whereby the moisture reduction of vacuum-dried blueberry fruits was measured by applying the capacitive measuring method, in order to check the method and contribute to possible development of applicative devices. A real vacuum chamber with radiating plate electric heaters and additional functional and regulation equipment was used. Measuring sensors were projected and made, and a measuring device was assembled and programmed. By changing very low values of capacitance, the possibility of measuring moisture reduction in blueberry fruits during drying was confirmed. A close connection between the regulation precision of working parameters (subpressure, temperature) in the chamber and the accuracy of measuring the material moisture was underlined. By using an interdigital sensor acceptable sensitivity in measuring the moisture of dried material was achieved. Guidelines for further research and possible development of an applicable measuring device were suggested. Source

Samardzic I.,Josip Juraj Strossmayer University of Osijek | Cikic A.,Technical college in Bjelovar | Dunder M.,University of Rijeka
Tehnicki Vjesnik | Year: 2015

It is of high importance to determine the distribution of thermal fields in arc fusion welding processes due to their influence on mechanical properties and quality of welded joints. This paper presents analytical models for 2D and 3D heat conduction based on solutions of the Fourier’s heat conduction differential equation. Furthermore, authors provide simplified equations for the calculation of cooling time and cooling rate for 2D and 3D heat conduction models. © 2015, Strojarski Facultet. All rights reserved. Source

Cikic A.,Technical college in Bjelovar | Pintaric A.,University of applied sciencies | Samardzic I.,Josip Juraj Strossmayer University of Osijek
Metalurgija | Year: 2013

Various types, forms and states aff ect the heating value of biomass and its conversion into exploitable energy forms. As a result of biomass quality investigations, the share of solid particles in fl ue gases purifi ed in a multicyclone was measured and analyzed at various heating loads of a boiler, the maximum power of which amounts to 2,2 MW. This paper presents the infl uence of fl ue gases on the roughness and corrosiveness of multicyclone material inner wall. A corrective dimensional parameter of the multicyclone was suggested for the purpose of maximum purifi cation of fl ue gases at unfavorable incineration conditions and biomass characteristics. Source

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