2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)最新文献

{"title":"100 Years - Evolution of Electrical Engineering Curriculum","authors":"C. Popescu, Mihai Octavian Popescu","doi":"10.1109/ISFEE.2018.8742449","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742449","url":null,"abstract":"The evolution of the society towards an economy that is based on knowledge and information determines a new definition of electrical engineering. In this paper, it is considered a different approach regarding the electrical energy systems as power systems that are controlled with the use of microprocessors, taking as reference the situation from 100 years ago. New tendencies that can be found in the reform of electrical engineering curricula are discussed and also some invariants.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122176663","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}

{"title":"ISFEE 2018 Copyright Page","authors":"","doi":"10.1109/isfee.2018.8742482","DOIUrl":"https://doi.org/10.1109/isfee.2018.8742482","url":null,"abstract":"","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115355997","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}

{"title":"Effect of Iron and Aluminum Powders on the Properties of Composites with Isotactic Polypropylene","authors":"D. Gavrilă, A. Caramitu, S. Mitrea, C. Păun, Mihai Zburlea","doi":"10.1109/ISFEE.2018.8742420","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742420","url":null,"abstract":"It is studied the behavior of composite materials with isotactic polypropylene (iPP) matrix and iron (Fe) and aluminum (Al) metallic powders. Concentrations of metallic powders were 3, 5 and 8 %. The raw materials are mixed in a turbula in the required quantities and the melt is injected in the form of the samples used in the measurements. The Al and Fe powders had two granulations. A comparative study is made in the case of materials for the mechanical, thermal and electrical characteristics. Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) measurements allowed to explain the changes in the structure.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121843187","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}

{"title":"An Overview of the Properties and Industrial Applications of Shape Memory Alloys","authors":"S. Degeratu, P. Rotaru, Irina Boncea, D. Tarniţă, L. Alboteanu","doi":"10.1109/ISFEE.2018.8742410","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742410","url":null,"abstract":"In shape memory alloys (SMAs), the thermoelastic martensitic transformation between austenite and martensite phases leads to the appearance of the shape memory effect and super-elasticity. In addition, these alloys present high mechanical strength, great ductility, vibration damping property and hysteresis behavior. All of the above-mentioned properties make these alloys very promising for industrial applications and their usage leads to the increase of productivity and efficiency of the devices they pertain to. The purpose of this article is, on the one hand, to increase the awareness of R & D engineers about the existence and use of SMAs by describing and promoting the unusual properties and effects of these materials and, on the other hand, to outline some of their most promising industrial applications.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125147149","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}

{"title":"Concerning the separation of space charge at the DC cable joints interfaces","authors":"L. Taranu, P. Notingher, C. Stancu","doi":"10.1109/ISFEE.2018.8742454","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742454","url":null,"abstract":"This paper presents a study concerning the experimental and theoretical determination of the charge separated at the EPR/XLPE joint interface.Taking into consideration the values of the electrical conductivities and permittivities experimentally determined, the relaxation times of the electric charge, charge density s separated at the interface EPR/XLPE and those of the electric field were computed, both in electrostatic and steady-state regimes.It has been found that the computed values of s are close to those determined experimentally, that s increases in time and with temperature. The higher values of s lead to the intensification of the electric field during the operation and of the residual electric field after power-off.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129647148","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}

{"title":"An Integrated Probabilistic Approach for Power Transformers Availability","authors":"C. Mihalcea, F. Munteanu, F. Băiceanu","doi":"10.1109/ISFEE.2018.8742432","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742432","url":null,"abstract":"The paper present an integrated approach of power transformers availability considering 7 high power 110/6.3 kV and 20 years as the monitoring time interval. With respect to a given load point, the interruptions frequency, duration and cause are revealed on a statistical bases. Not only the PTs and their unavailability but also the surround equipment like circuit-breakers, feeder and load point events were included as interruption sources. For PTs, internal and external failures as well as the planned (maintenance) events were considered.Time to failure, time to repair, mean time between events and its progress over time were probabilistically estimated. The results allow for a better maintenance management and for a good estimation of the quality of supply.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128772092","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}

{"title":"Frequency Domain Models for Nonlinear Home Appliance Devices","authors":"A. Gheorghe, F. Constantinescu, M. Marin, V. Ștefănescu, Gabriel Vătășelu","doi":"10.1109/ISFEE.2018.8742469","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742469","url":null,"abstract":"New frequency domain models for nonlinear home appliances as air conditioning systems, vacuum cleaners, microwave ovens and compact fluorescent lamps are proposed. These models employ measured amplitudes and phases of the current fundamental and harmonic components. The harmonic balance simulation using these models is very fast.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128439367","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}

{"title":"Automatic control system for stage lights","authors":"Iulian-Dan Stanescu, B. Enache, G. Seritan, S. Grigorescu, F. Argatu, F. Adochiei","doi":"10.1109/ISFEE.2018.8742409","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742409","url":null,"abstract":"In this paper we present an automatic control system for stage lights that can be used for small events. The system has two main functions: it can perform a generic light show that corresponds to a specific music type like jazz, pop or rock, or it can adapt to the music performed on stage by the artist. The system uses an Arduino Mega for processing the collected data from a MEMS microphone breakout board and a specialized graphic equalizer chip and for controlling the LED lights.The system is designed to be in the low cost range so an independent or debutant artist can acquire it.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123296474","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}

{"title":"On Optimization of Wireless Power Transfer Systems","authors":"Alina Orasanu, A. Dragomir, Lavinia Bobaru, M. Iordache, S. Deleanu","doi":"10.1109/ISFEE.2018.8742427","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742427","url":null,"abstract":"The main objective of this paper is a study with reference to the optimal electromagnetic power wireless transfer, and with direct application on battery chargers. The main elements impacting the optimal operation of the wireless battery charging systems are: load resistance, mutual coupling factor and the parameters of secondary coil. It is assumed that the two magnetically coupled coils operate at the same resonance frequency, which has a common value for both circuits, source and receiver. The mode the two coils are connected, influences the values of the optimum efficiency and maximum amount of active power transferred to the load, with the best results for the \"series-series\" connection. The magnetically coupled systems must be able to ensure a fast and reliable charging of ultra-capacitors used for the storage of energy. Whereas charging the ultra-capacitors is a fast process, the standard inductively coupled circuits can deliver maximum power only if the impedance of the load reaches a well determined value. This value strongly depends on the shape and dimensions of each coil, as well as the space between the coils. The impedance of the load must be brought to an optimum value, according to the request for optimum efficiency in conditions maximum active power transfer. The procedure involves inductivity adjustment for the secondary coil, accompanied by determination of tuning capacitance at resonance. Optimal efficiency value and maximum real power transferred to the load have been determined through parameter analysis.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115502841","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}

{"title":"Optimization of Storing the Environmental Databases for Future Modeling of Power Plant","authors":"V. Radulescu","doi":"10.1109/ISFEE.2018.8742472","DOIUrl":"https://doi.org/10.1109/ISFEE.2018.8742472","url":null,"abstract":"To make new investments in power plants based on renewable resources is necessary to perform some pre-feasibility studies. They provide data concerning the energetic capacity of the area. Each review is based firstly on the environmental data monitored for an extended period, at least two years, according to the international rules. These complex databases prove and assure the economic feasibility and future efficiency of the power plants. The paper presents a new solution for recording and storing the environmental measurements, performed during four years with masts having 80 m height. They cover a larger area from the interest zone. Firstly some aspects referring to the mast's characteristic and installation are mentioned. Some observations relating to the influences induced by the masts presence are also briefly illustrated. Elaboration of the database was a challenge, due to the 12 instantly recorded parameters at a time interval of 10 minutes (some of them even at 10 seconds) for four years. Besides these main parameters, some other data were stored, referring to the energy possible to be produced daily, with wind turbines or PV panels. The method of compacting the data is original, to use small amounts of computer memory. With the daily collected values and stored the average, the maximum and minimum values for the wind velocity, temperature, solar radiation, pressure, and humidity were calculated, separately, for each day and month, from the data measured at a time interval of 10 minutes. Some dedicated software was used to realize specific reports referring to the wind farms efficiency, for different classes of wind speed and direction. Another part of the database was structured for extreme values, stored separately. A particular chapter is dedicated to the measurements of the temperature, pressure, humidity and their influence in the solar power plant realization. With the recorded data by numerical modeling a future wind power plant was estimated. Finally, the paper ends with numerical results, some conclusions, and references.","PeriodicalId":253583,"journal":{"name":"2018 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115794711","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}