ACKNOWLEGMENT Many scientists and colleagues from abroad and inside Iran (listed below) voluntari... more ACKNOWLEGMENT Many scientists and colleagues from abroad and inside Iran (listed below) voluntarily helped us very much in review and evaluation process of manuscripts being accepted for publication in 2015 issues of IJRR (volume 13, numbers 1-4) and those not suitable for publication. Indeed their careful and critically reading the manuscripts and their valuable comments and suggestions greatly improved the quality of papers. On behalf of the executive and editorial board of the International Journal of Radiation Research (IJRR) I sincerely thank all of them for their efforts and support throughout the past years and we hope to have their continued support and help in the future. Prof.
The article presents the needs for professional training of technicians and engineers in mechanic... more The article presents the needs for professional training of technicians and engineers in mechanical engineering and mechatronics was conducted in two areas of Bulgaria - Gabrovo and Plovdiv, Kavala, Greece, Pomorskie Region, Poland and Nis region, Serbia. These regions are very different, both in area and population and the most developed sectors of the economy. The survey was realized under an Erasmus+ KA2 programme which duration from 1.09.2020 up to 31.08.2022 with title Active Learning Community for Upskilling Technicians and Engineers. This works presents the basic data about the training proposals both for engineers and technicians. Last but not least illustrates the preferences of companies about the most suitable training method.
Based on the data of a recent survey in European Union more than 40% of EU employees experienced ... more Based on the data of a recent survey in European Union more than 40% of EU employees experienced a recent change in the technologies they use at work. According to the experts new technologies and structural modification in many areas and professions will provide a higher dependence on cognitive and interpersonal skills in future works. Active Learning Community for Upskilling Technicians and Engineers is a project, developed under Erasmus+ programme, KA2 and lasting from 1.09.2020 to 31.08.2022. It offers an alternative solution to address these challenges and needs by developing an active learning platform for engineering and technical staff in the sector of Machine Building and Mechatronics. This article also presents the results from the 2 lesson which realized in Kavala, Greece.
Background : Monte Carlo simulaons play a vital role in the calculaon of the necessary shielding ... more Background : Monte Carlo simulaons play a vital role in the calculaon of the necessary shielding both for neutrons and photons. Advanced and simple shielding materials against neutron and gamma rays were compared by simulaon using the MCNB4B Monte Carlo code. The simulaons were carried out for the three common neutron sources, namely the 252 Cf, the 241 Am/Be and the DD neutron generator which are suitable for transportable facilies. Materials and Methods : The source has been simulated as sphere with 3 cm diameter while the necessary shielding is designed in the form of a sphere around the neutron source. The materials considered were chosen according to the EU Direcve 2002/95/EC, hence excluding lead and cadmium. Results: In the case of DD neutron generator the thickness, the weight and the volume of the shield can decrease up to 41.3, 44, and 78.4% correspondingly. With regard to the 252 Cf neutron source the use of advanced shielding materials can reduce the corresponding parame...
ABSTRACT The potential for a 20 kW photovoltaic (PV) power plant in Greece is examined in this st... more ABSTRACT The potential for a 20 kW photovoltaic (PV) power plant in Greece is examined in this study. HOMER software is used to predict energy production, cost of energy and reduction of green house gasses (GHGs) emissions. The long-term meteorological parameters for 46 sites in Greece being considered by the Centre for Renewable Energy Sources and Saving (CRES) are analyzed. The global solar radi-ation varies between a minimum of 4.04 kW h/m 2 /day in Ioannina and a maximum of 4.89 kW h/m 2 /day in Tymbakion, while the mean value for the 46 locations remained as 4.46 kW h/m 2 /day. The renewable energy produced each year from the PV power plant varied between 33.35 MW h in Ioannina and 41.63 MW h in Tymbakion while the average value for the 46 locations is 37.61 MW h. The results of the financial analysis demonstrate that a PV power plant can operate profitably at any of the considered sites in Greece. The capacity factor of a PV plant varies between 19.4% and 24.2% and the cost of electricity varies between 0.122 €/kW h and 0.152 €/ kW h from the most appropriate location to the least attractive location respectively. Bearing in mind that the electricity cost for con-sumers in Greece is approximately 0.13 €/kW h, the present study demonstrates that photovoltaics can play an important role in Greek energy generation. Last but not least, utilization of photovoltaics means that considerable quantity of CO 2 is not released into the local atmosphere each year.
International Journal of Computational Engineering Science
The primary objective of this study is to determine a hybrid system, which combines wind and hydr... more The primary objective of this study is to determine a hybrid system, which combines wind and hydraulic energy, able to supply the necessary electrical load of a typical community in a remote location in Plaka, Alexandroupolis, Greece. This is the first effort for utilization of wind and hydraulic energy potential of the aforementioned area. The obtained results prove that the development of a hybrid energy system is feasible, which uses a combination of renewable energy sources in this area, with satisfactory efficiency and without creating environmental pollution.
Normal 0 false false false EL X-NONE X-NONE MicrosoftInternetExplorer4 Based on a portable and hi... more Normal 0 false false false EL X-NONE X-NONE MicrosoftInternetExplorer4 Based on a portable and high-resolution infrared thermographic system, this work studies the temperature measurement of the windings in a three phase electrical motor. The electrical machine operated under two scenarios, without load and under full-load conditions. The full-load scenario presents considerably higher temperatures and requires more time in order to reach a steady temperature state. In order to evaluate how an overload condition affects the temperature of the windings, we tested the machine under 10% overload for 15 minutes and the results proved that the temperature increases rapidly not only in the windings but also in the whole machine.
The financial and economic crisis in Greece has brought new taxes on the fossil fuels. During the... more The financial and economic crisis in Greece has brought new taxes on the fossil fuels. During the depression (January 2009 - June 2011) the diesel-oil price was rising more than 65%. The aim of this study is to investigate how this crisis has affected the electricity cost for a remote consumer. The HOMER software was used in order to find the optimum hybrid system for a typical country house in four different Greek Islands. The generality of Greek Islands are suitable for exploitation of wind energy for electricity generation. Due to the dramatically increased prices for diesel-oil over the last two years in Greece, the PV generators offer not only environmental benefits but also provide lower cost of energy and can displace the diesel engine generators.
ACKNOWLEGMENT Many scientists and colleagues from abroad and inside Iran (listed below) voluntari... more ACKNOWLEGMENT Many scientists and colleagues from abroad and inside Iran (listed below) voluntarily helped us very much in review and evaluation process of manuscripts being accepted for publication in 2015 issues of IJRR (volume 13, numbers 1-4) and those not suitable for publication. Indeed their careful and critically reading the manuscripts and their valuable comments and suggestions greatly improved the quality of papers. On behalf of the executive and editorial board of the International Journal of Radiation Research (IJRR) I sincerely thank all of them for their efforts and support throughout the past years and we hope to have their continued support and help in the future. Prof.
The article presents the needs for professional training of technicians and engineers in mechanic... more The article presents the needs for professional training of technicians and engineers in mechanical engineering and mechatronics was conducted in two areas of Bulgaria - Gabrovo and Plovdiv, Kavala, Greece, Pomorskie Region, Poland and Nis region, Serbia. These regions are very different, both in area and population and the most developed sectors of the economy. The survey was realized under an Erasmus+ KA2 programme which duration from 1.09.2020 up to 31.08.2022 with title Active Learning Community for Upskilling Technicians and Engineers. This works presents the basic data about the training proposals both for engineers and technicians. Last but not least illustrates the preferences of companies about the most suitable training method.
Based on the data of a recent survey in European Union more than 40% of EU employees experienced ... more Based on the data of a recent survey in European Union more than 40% of EU employees experienced a recent change in the technologies they use at work. According to the experts new technologies and structural modification in many areas and professions will provide a higher dependence on cognitive and interpersonal skills in future works. Active Learning Community for Upskilling Technicians and Engineers is a project, developed under Erasmus+ programme, KA2 and lasting from 1.09.2020 to 31.08.2022. It offers an alternative solution to address these challenges and needs by developing an active learning platform for engineering and technical staff in the sector of Machine Building and Mechatronics. This article also presents the results from the 2 lesson which realized in Kavala, Greece.
Background : Monte Carlo simulaons play a vital role in the calculaon of the necessary shielding ... more Background : Monte Carlo simulaons play a vital role in the calculaon of the necessary shielding both for neutrons and photons. Advanced and simple shielding materials against neutron and gamma rays were compared by simulaon using the MCNB4B Monte Carlo code. The simulaons were carried out for the three common neutron sources, namely the 252 Cf, the 241 Am/Be and the DD neutron generator which are suitable for transportable facilies. Materials and Methods : The source has been simulated as sphere with 3 cm diameter while the necessary shielding is designed in the form of a sphere around the neutron source. The materials considered were chosen according to the EU Direcve 2002/95/EC, hence excluding lead and cadmium. Results: In the case of DD neutron generator the thickness, the weight and the volume of the shield can decrease up to 41.3, 44, and 78.4% correspondingly. With regard to the 252 Cf neutron source the use of advanced shielding materials can reduce the corresponding parame...
ABSTRACT The potential for a 20 kW photovoltaic (PV) power plant in Greece is examined in this st... more ABSTRACT The potential for a 20 kW photovoltaic (PV) power plant in Greece is examined in this study. HOMER software is used to predict energy production, cost of energy and reduction of green house gasses (GHGs) emissions. The long-term meteorological parameters for 46 sites in Greece being considered by the Centre for Renewable Energy Sources and Saving (CRES) are analyzed. The global solar radi-ation varies between a minimum of 4.04 kW h/m 2 /day in Ioannina and a maximum of 4.89 kW h/m 2 /day in Tymbakion, while the mean value for the 46 locations remained as 4.46 kW h/m 2 /day. The renewable energy produced each year from the PV power plant varied between 33.35 MW h in Ioannina and 41.63 MW h in Tymbakion while the average value for the 46 locations is 37.61 MW h. The results of the financial analysis demonstrate that a PV power plant can operate profitably at any of the considered sites in Greece. The capacity factor of a PV plant varies between 19.4% and 24.2% and the cost of electricity varies between 0.122 €/kW h and 0.152 €/ kW h from the most appropriate location to the least attractive location respectively. Bearing in mind that the electricity cost for con-sumers in Greece is approximately 0.13 €/kW h, the present study demonstrates that photovoltaics can play an important role in Greek energy generation. Last but not least, utilization of photovoltaics means that considerable quantity of CO 2 is not released into the local atmosphere each year.
International Journal of Computational Engineering Science
The primary objective of this study is to determine a hybrid system, which combines wind and hydr... more The primary objective of this study is to determine a hybrid system, which combines wind and hydraulic energy, able to supply the necessary electrical load of a typical community in a remote location in Plaka, Alexandroupolis, Greece. This is the first effort for utilization of wind and hydraulic energy potential of the aforementioned area. The obtained results prove that the development of a hybrid energy system is feasible, which uses a combination of renewable energy sources in this area, with satisfactory efficiency and without creating environmental pollution.
Normal 0 false false false EL X-NONE X-NONE MicrosoftInternetExplorer4 Based on a portable and hi... more Normal 0 false false false EL X-NONE X-NONE MicrosoftInternetExplorer4 Based on a portable and high-resolution infrared thermographic system, this work studies the temperature measurement of the windings in a three phase electrical motor. The electrical machine operated under two scenarios, without load and under full-load conditions. The full-load scenario presents considerably higher temperatures and requires more time in order to reach a steady temperature state. In order to evaluate how an overload condition affects the temperature of the windings, we tested the machine under 10% overload for 15 minutes and the results proved that the temperature increases rapidly not only in the windings but also in the whole machine.
The financial and economic crisis in Greece has brought new taxes on the fossil fuels. During the... more The financial and economic crisis in Greece has brought new taxes on the fossil fuels. During the depression (January 2009 - June 2011) the diesel-oil price was rising more than 65%. The aim of this study is to investigate how this crisis has affected the electricity cost for a remote consumer. The HOMER software was used in order to find the optimum hybrid system for a typical country house in four different Greek Islands. The generality of Greek Islands are suitable for exploitation of wind energy for electricity generation. Due to the dramatically increased prices for diesel-oil over the last two years in Greece, the PV generators offer not only environmental benefits but also provide lower cost of energy and can displace the diesel engine generators.
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