Thermoelectric cooling has been attracting increasing interest in recent years. This is due to the development of technologies for the production of highly efficient thermoelectric materials and the number of advantages that thermoelectric energy converters have, e.g., small dimensions, quiet operation and ecological safety. The present paper describes how to simulate two temperatures, the cold side heat sink temperature of a thermoelectric pump and the thermoelectric cooling system volume temperature, applying the method of regression analysis.
{"title":"Regression Models of a Thermoelectric Cooling System Based on Multi-Stage Peltier Module","authors":"I. Belovski, I. Aleksandrova, A. Aleksandrov","doi":"10.1109/ET.2019.8878324","DOIUrl":"https://doi.org/10.1109/ET.2019.8878324","url":null,"abstract":"Thermoelectric cooling has been attracting increasing interest in recent years. This is due to the development of technologies for the production of highly efficient thermoelectric materials and the number of advantages that thermoelectric energy converters have, e.g., small dimensions, quiet operation and ecological safety. The present paper describes how to simulate two temperatures, the cold side heat sink temperature of a thermoelectric pump and the thermoelectric cooling system volume temperature, applying the method of regression analysis.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122395389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Kambushev, S. Biliderov, Kaloyan Yovchev, D. Chikurtev, K. Kambushev, N. Chivarov
Small-sized robotized unmanned flying vehicles are exposed to non-deterministic disturbances caused by the environment in which they operate. This research investigates the influence of the disturbances caused by the atmospheric turbulence. The deviation from the desired flight trajectory in such conditions is evaluated through a MATLAB computer simulation of LQR control of quadrotor. The proposed experimental setup can be used for comparison and evaluation of other trajectory tracking control methods.
{"title":"Influence of atmospheric turbulence on the control of flying robotics systems","authors":"M. Kambushev, S. Biliderov, Kaloyan Yovchev, D. Chikurtev, K. Kambushev, N. Chivarov","doi":"10.1109/ET.2019.8878670","DOIUrl":"https://doi.org/10.1109/ET.2019.8878670","url":null,"abstract":"Small-sized robotized unmanned flying vehicles are exposed to non-deterministic disturbances caused by the environment in which they operate. This research investigates the influence of the disturbances caused by the atmospheric turbulence. The deviation from the desired flight trajectory in such conditions is evaluated through a MATLAB computer simulation of LQR control of quadrotor. The proposed experimental setup can be used for comparison and evaluation of other trajectory tracking control methods.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128949315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Marinov, Ivan Topalov, Borislav Ganev, E. Gieva, Vasil Galabov
Technologies using Unmanned Aerial Vehicles (UAVs) have been the subject of research for many years now. They are increasingly used in a number of public and private projects. UAVs with their mobility and ability to fly at different altitudes can compensate for some shortcomings in the wireless sensor network and offer an alternative approach to data harvesting. With their help, it is easy to allow spatial research of different areas/spaces. This is particularly important in the study of air pollution, which changes sharply even over relatively short distances in the horizontal and vertical directions. In the present study is presented a research of possibilities for application of a new instrument for studying the air quality at different altitudes, which is accessible to a wide range of users. The approach is based on using cheap UAVs and low-cost air quality sensors. This paper shows the relevance of a customized, off the shelf UAV equipped with mobile monitoring devices as an effective, versatile, and unconventional means to collect three-dimensional air pollutant concentration data.
{"title":"UAVs Based Particulate Matter Pollution Monitoring","authors":"M. Marinov, Ivan Topalov, Borislav Ganev, E. Gieva, Vasil Galabov","doi":"10.1109/ET.2019.8878586","DOIUrl":"https://doi.org/10.1109/ET.2019.8878586","url":null,"abstract":"Technologies using Unmanned Aerial Vehicles (UAVs) have been the subject of research for many years now. They are increasingly used in a number of public and private projects. UAVs with their mobility and ability to fly at different altitudes can compensate for some shortcomings in the wireless sensor network and offer an alternative approach to data harvesting. With their help, it is easy to allow spatial research of different areas/spaces. This is particularly important in the study of air pollution, which changes sharply even over relatively short distances in the horizontal and vertical directions. In the present study is presented a research of possibilities for application of a new instrument for studying the air quality at different altitudes, which is accessible to a wide range of users. The approach is based on using cheap UAVs and low-cost air quality sensors. This paper shows the relevance of a customized, off the shelf UAV equipped with mobile monitoring devices as an effective, versatile, and unconventional means to collect three-dimensional air pollutant concentration data.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128626326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The presented article deals with steady-state analysis of five-phase Induction Motor (IM) pentagon connected, which is supplied by rectangular voltage from five-legs Voltage Source Inverter (VSI). Complex Fourier-series was used to express inverter terminal voltages. Based on mathematically described inverter output voltages, a formula for VSI output space phasor was derived. Assuming sinusoidal motor winding distribution and on the basis of motor parameters, stator and rotor current space phasors for were determined a defined motor load. Finally, the electromagnetic torque ripple waveforms for different IM operation states were investigated.
{"title":"Mathematical Model of a Five-Phase Pentagon Connected IM Supplied by a Rectangular Voltage","authors":"P. Záskalický","doi":"10.1109/ET.2019.8878543","DOIUrl":"https://doi.org/10.1109/ET.2019.8878543","url":null,"abstract":"The presented article deals with steady-state analysis of five-phase Induction Motor (IM) pentagon connected, which is supplied by rectangular voltage from five-legs Voltage Source Inverter (VSI). Complex Fourier-series was used to express inverter terminal voltages. Based on mathematically described inverter output voltages, a formula for VSI output space phasor was derived. Assuming sinusoidal motor winding distribution and on the basis of motor parameters, stator and rotor current space phasors for were determined a defined motor load. Finally, the electromagnetic torque ripple waveforms for different IM operation states were investigated.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117295251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper explores new tendencies in the validation of non-formal and informal learning starting with the new trends in the life-long learning. Microlearning, private company certifications versa diploma, social learning, virtual classrooms, artificial intelligence and other nowadays phenomena in the learning are mentioned. Validation trends in VET providers and in private companies sector is presented. Structuring the learning content in assessable units, flexible paths, accumulation of results principles and other trends in the certification procedures are explored. Extended model for validation of non-formal and informal learning showing different aspects of the validation process is presented. The validation trends of non-formal and informal learning are illustrated with some examples from the ICT sector.
{"title":"New Tendencies in the Validation of Non-formal and Informal Learning with Some Examples of Validation in the ICT Sector","authors":"R. Petkov","doi":"10.1109/ET.2019.8878605","DOIUrl":"https://doi.org/10.1109/ET.2019.8878605","url":null,"abstract":"The paper explores new tendencies in the validation of non-formal and informal learning starting with the new trends in the life-long learning. Microlearning, private company certifications versa diploma, social learning, virtual classrooms, artificial intelligence and other nowadays phenomena in the learning are mentioned. Validation trends in VET providers and in private companies sector is presented. Structuring the learning content in assessable units, flexible paths, accumulation of results principles and other trends in the certification procedures are explored. Extended model for validation of non-formal and informal learning showing different aspects of the validation process is presented. The validation trends of non-formal and informal learning are illustrated with some examples from the ICT sector.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125815599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Valentin Atanassov Devedjiev, Iordan Stefanov Chahanov, Svetoslav Orlinov Sotirov, S. Stefanova, T. Vasileva, Anastas Dimitrov Kostenarov
The paper briefly discusses the labor market requirements and need of new school education models to face knowledge economy challenges. The survey of worldwide university integrated schools is given, which proves such institutions as an effective example for todays’ education for tomorrows’ jobs. The concept and experience in integration between the Technical University-Sofia and the Technological school “Electronic Systems”, integrated with the university is considered. Finally the results of close cooperation between school and university are covered.
{"title":"University Affiliated Schools – the Key to a Modern Economy","authors":"Valentin Atanassov Devedjiev, Iordan Stefanov Chahanov, Svetoslav Orlinov Sotirov, S. Stefanova, T. Vasileva, Anastas Dimitrov Kostenarov","doi":"10.1109/ET.2019.8878569","DOIUrl":"https://doi.org/10.1109/ET.2019.8878569","url":null,"abstract":"The paper briefly discusses the labor market requirements and need of new school education models to face knowledge economy challenges. The survey of worldwide university integrated schools is given, which proves such institutions as an effective example for todays’ education for tomorrows’ jobs. The concept and experience in integration between the Technical University-Sofia and the Technological school “Electronic Systems”, integrated with the university is considered. Finally the results of close cooperation between school and university are covered.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"93 Pt A 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122654466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current work is aimed at comparing the models used for describing the vibrational piezoelectric harvesters and the obtained experimental data from such kind of devices. The purpose of such comparison is to determine which features of the models do not correspond to reality.
本文将振动式压电收割机的模型与实验数据进行了比较。这种比较的目的是确定模型的哪些特征与现实不符。
{"title":"Differences between Models for Piezoelectric Harvesters and Practice Results","authors":"D. Kolev, V. Todorova","doi":"10.1109/ET.2019.8878634","DOIUrl":"https://doi.org/10.1109/ET.2019.8878634","url":null,"abstract":"The current work is aimed at comparing the models used for describing the vibrational piezoelectric harvesters and the obtained experimental data from such kind of devices. The purpose of such comparison is to determine which features of the models do not correspond to reality.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122808650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the presented paper we investigate the properties of spectral EEG features for the detection of negative emotional states. In particular, the proposed features represent the dynamics of energy distribution in the frequency range of 20–35 Hz, based on a time-frequency analysis of multichannel EEG signal. The experimental evaluation is based on data from the DEAP database. We report results with J48- and SMO-based classifiers, in terms of average classification accuracy, 94.3% and 96.8%, respectively.
{"title":"Spectral Features of EEG Signals for the Automated Recognition of Negative Emotional States","authors":"F. Feradov, T. Ganchev","doi":"10.1109/ET.2019.8878557","DOIUrl":"https://doi.org/10.1109/ET.2019.8878557","url":null,"abstract":"In the presented paper we investigate the properties of spectral EEG features for the detection of negative emotional states. In particular, the proposed features represent the dynamics of energy distribution in the frequency range of 20–35 Hz, based on a time-frequency analysis of multichannel EEG signal. The experimental evaluation is based on data from the DEAP database. We report results with J48- and SMO-based classifiers, in terms of average classification accuracy, 94.3% and 96.8%, respectively.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121147619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Stoynova, I. Aleksandrova, A. Aleksandrov, G. Goranov
The paper presents a method for non-contact and non-invasive study and monitoring of cut-off wheel wear upon elastic abrasive cutting by applying the methods of infrared thermography and planned experiments. Theoretical and experimental models reflecting the dependence between cut-off wheel wear, cut-off wheel temperature and workpiece temperature have been built for different materials being machined (C45 and 42Cr4 steels). Temperature control possibilities are studied by choosing elastic abrasive cutting conditions so as to ensure the desired cut-off wheel wear values.
{"title":"Non-Contact Measurement and Monitoring of Cut-off Wheel Wear","authors":"A. Stoynova, I. Aleksandrova, A. Aleksandrov, G. Goranov","doi":"10.1109/ET.2019.8878321","DOIUrl":"https://doi.org/10.1109/ET.2019.8878321","url":null,"abstract":"The paper presents a method for non-contact and non-invasive study and monitoring of cut-off wheel wear upon elastic abrasive cutting by applying the methods of infrared thermography and planned experiments. Theoretical and experimental models reflecting the dependence between cut-off wheel wear, cut-off wheel temperature and workpiece temperature have been built for different materials being machined (C45 and 42Cr4 steels). Temperature control possibilities are studied by choosing elastic abrasive cutting conditions so as to ensure the desired cut-off wheel wear values.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116477432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
this paper presents research about characteristics of a single ended resonant converter (SERC). This converter consists of two main parts – a synchronous voltage doubler rectifier (SVDR) and a single ended resonant inverter (SERI). In this circuit variant, the SERI is actually a supplying source for the synchronous rectifier. Because a SERI could work as a current source the examination is made in two variants. In the first variant, the supplying source for synchronous rectifier is an ideal current source. For this purpose the power MOSFET and the other resonant components from SERI are removed. They are replaced by an ideal sinusoidal current source. The high frequency transformer is kept. In that way the output of the converter (the output of the SVDR) is kept galvanically isolated from its input (the current source). In the second variant, the supplying source for the synchronous rectifier is SERI itself. Parametrical analysis with LTSpice simulation software is made for two cases. The first case is when the load resistance is changing but the filtering capacitors have constant capacitance. The second case is when the load resistance doesn’t change but the capacitance of the two filtering capacitors is changing. To confirm the results an experimental model has developed.
{"title":"Characteristics of Single Ended Resonant Converter with Voltage Doubler Synchronous Rectirier","authors":"Dimitar D. Arnaudov, Krasimir Kishkin","doi":"10.1109/ET.2019.8878615","DOIUrl":"https://doi.org/10.1109/ET.2019.8878615","url":null,"abstract":"this paper presents research about characteristics of a single ended resonant converter (SERC). This converter consists of two main parts – a synchronous voltage doubler rectifier (SVDR) and a single ended resonant inverter (SERI). In this circuit variant, the SERI is actually a supplying source for the synchronous rectifier. Because a SERI could work as a current source the examination is made in two variants. In the first variant, the supplying source for synchronous rectifier is an ideal current source. For this purpose the power MOSFET and the other resonant components from SERI are removed. They are replaced by an ideal sinusoidal current source. The high frequency transformer is kept. In that way the output of the converter (the output of the SVDR) is kept galvanically isolated from its input (the current source). In the second variant, the supplying source for the synchronous rectifier is SERI itself. Parametrical analysis with LTSpice simulation software is made for two cases. The first case is when the load resistance is changing but the filtering capacitors have constant capacitance. The second case is when the load resistance doesn’t change but the capacitance of the two filtering capacitors is changing. To confirm the results an experimental model has developed.","PeriodicalId":306452,"journal":{"name":"2019 IEEE XXVIII International Scientific Conference Electronics (ET)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129866219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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