Scientific Works

The Hydrophily of Some Lacquers for Electrical Use

Adriana-Mariana Bors, Alina-Ruxandra Caramitu, Dorian Marin, Iosif Lingvay

Materiale Plastice (Mater. Plast.), Year 2020, Volume 57, Issue 1, 122-132
ISSN Print 0025-5289
ISSN Online 2668-8220

Through gravimetric determinations, volume resistivity, dielectric spectroscopy, and comparative thermal analysis (TG, DTA and DTG), the interactions between the distilled water and three different types of alkyd-epoxy-melamine, epoxy and polyurethane lacquers were studied. From the experimental determinations it was found that after 700 h of immersion in water at 20 ± 2°C the alkyd-epoxy-melamine based lacquer has a maximum water uptake, respectively 1.76%, followed by the epoxy lacquer 1.4% and polyurethane 0.93%. The thermal analysis sugests that because the water retained by the investigated polymers does not change the TG diagrams in the temperature range up to 150 °C, which suggests that the weight increase of the samples during the immersion could be due to some chemical processes between the water and polymer by which the chemistry structure of the polymer changes. Through electrical measurementes one can observe that after the immersion in water (over 700 hours), dielectric loss increases and the volume resistivity (measured in DC) of the investigated lakes decreases, which is explained by the increasing of polar groups (-OH) in the polymer structure. A comparative analysis of the experimental data reveals that in electrical applications the lacquer LS (polyurethane) is superior to the lacquers L-528 (alkyd-epoxy-melamine) and LG (epoxy), because it has no mass losses (structural changes) up to 280°C it has a volume resistivity of about 21 % higher than L-G, and about 300 % higher than L-528, and has water uptake and dielectric loss substantially lower comparing to L-528 and L-G.

Complex System for Earthquake Prediction, Warning and Local Assessment of Seismic Events

Iosif LINGVAY, Victorin Emilian TOADER, Ovidiu CIOGESCU, Adriana BORȘ, Andrei MIHAI

Electrotehnica, Electronica, Automatica (EEA), 2021, vol. 69, no. 1, pp. 92-101, ISSN 1582-5175.

A complex system for zonal earthquake prediction, warning, and local assessment of seismic events has been designed, performed, implemented, and experimented/validated. The system was designed to ensure simultaneously: the reception of warning signals following earthquakes with the epicentre on a radius of 1000 km; acquisition of local precursor data for a possible prediction of seismic events with the epicentre in the perimeter of the targeted locality and/or improvement of the database in the field of Earth physics purchased and processed centrally at the national seismic dispatcher; acquisition of data on the intensity of local seismic movements, based on which, when a predetermined threshold considered dangerous is exceeded, a real-time action order is issued for the protection of high-risk equipment and installations in operation. The realized system is structured on the national seismic dispatcher DSN (with the role of seismic data acquisition from the territory) connected by a bidirectional communication system with a local dispatcher DL which is provided with a system for acquiring and storing local seismic data (vibration detector 3D and temperature transducer mounted in a 40 m deep drilled well, radon detector and associated parameters: temperature, pressure, and humidity of the air mounted at the mouth of the drilled well). The implemented system is able, through the specialized software implemented, to take over the warning signals received from the national seismic dispatcher, to process the locally acquired data, and after the local validation of the seismic event to issue real-time action command (when exceeding values of pre-established major risk threshold) of the protections of high-risk installations in operation in the targeted perimeter. The experimentation/validation of the system, of the interconnection networks, and of the specialized software of the implemented application was done both by continuously recording the local seismic parameters, verifying the communication between DSN and DL, and by taking two warnings regarding seismic events produced (on 30.10.2020 – Mw = 7, Greece and on 22.10.2020, at 20:22 hours, ML = 4 R, Vrancea, RO). By processing the data recorded during these events, the speeds of seismic waves in the respective directions were calculated. Thus, for the event of 30.10.2020 Greece, a speed of seismic waves of 7,418 km/second was determined and for the event from 22.10.2020 Vrancea, at 20:22 hours, it was calculated that the secondary waves are moving with 12,686 km/second and the surface seismic waves with 5,063 km/second. Following the analysis/comparison of acceleration intensities with the pre-set threshold level recorded locally for potentially dangerous events, it was found that these events were felt in Râmnicu Vâlcea at a level below the pre-set danger threshold and consequently, the specialized software of the application did not generate a control signal for actuating the protection of high-risk equipment in operation.

Prevention of Explosions and Fires caused by Earthquakes

CIOGESCU Ovidiu, TOADER Victorin, MIHAI Andrei, ȘCHIOPU Mihaela, BORȘ Adriana, LINGVAY Iosif

Electrotehnica, Electronica, Automatica (EEA), 2020, vol. 68, no. 3, pp. 86-93, ISSN 1582-5175.

Seismic warning and prediction systems based on precursor data packets were analysed aiming to develop a system to prevent explosions and fires caused by uncontrolled gas leaks following the deterioration of gas networks produced as a result of major seismic movements. At the current stage of knowledge, the accurate prediction in time and intensity of earthquakes is not possible. The simple information about a major earthquake, it is not a sufficient argument for shutting down gases over a large area. Closure of gases in buildings should only be done in the case of some tectonic movements that, on a local level (in that locality) exceed a certain pre-imposed threshold (considered dangerous). In this context, it is considered that an adequate seismic protection system for gas networks in a given locality must ensure: measuring /validating the intensity of local tectonic movements — preferably in 3D; generating a control signal for the closure of gases at the connections of buildings connected to the system — only if the intensity of seismic movements in the locality exceeds an imposed level (considered dangerous); secure digital communication with autonomous UPS power supply between the place of measurement /evaluation of the intensity of local seismic movements and the execution aquatics (electrovalves mounted before the gas regulation /measurement block of the protected buildings).

Modelling and Simulation of a Brushless DC Motor for Electric Power Steering Assistance

CIOBOATĂ D., NEACȘU M.G., STANCIU D., MATEI S.Șt., NEACȘU I.

Electrotehnica, Electronica, Automatica (EEA), 2020, vol. 68, no. 3, pp. 22-31, ISSN 1582-5175.

This paper presents an approach to develop a brushless DC motor to assist an electric power steering. Optimal design for electric power steering system implies the adequate selection of topology, technology, sizes and control algorithm. This paper briefly describes the electric power steering system structure, the most used topologies of electric power steering and the advantages of using brushless DC motors for electric power steering assistance. An electric power steering architecture is proposed. The method of design the brushless DC motor for this electric power steering is presented. Design of the brushless DC motor was based on the analysis of the requirements of the EPS systems, analysis of the control methods, modelling and simulation in MATLAB/SIMULINK. Simulation for six various conditions are presented and analysed for optimal sizing of the electric motor. An experimental model of the designed motor has been manufactured for validation.

CLOUD BASED MAINTENANCE IIOT PLATFORM FOR SMART MANUFACTURING

Lucian Nicolae Demeter, Radu Calistru, Bogdan Vărăticeanu, Paul Minciunescu, Paula Angheliţă

2020 Proceedings in Manufacturing Systems, Volume 15, Issue 3, Pages 113-119

The main objective of CM4SMART project was to perform research, development, simulation and production implementation of a smart manufacturing maintenance solution based on cloud technologies. The result of the project will enable digital transformation of the production in the direction of smart maintenance and new data driven production efficiency models for the SME sector. Following the key Industry 4.0 design principles, the project has succeeded to interconnect business level software systems with operational data from the field thus aligning production schedules with maintenance activities. Innovative machine learning algorithms for predictive maintenance analyses data and propose both preventive and optimization actions before machine failures take place thus aiming at zero downtime, zero defected manufacturing and a greener enterprise.

Electronic Improvements made for Industrial Valve

Constantin Nicolescu, Bogdan Vărăticeanu, Adrian Stoicescu, Cristian Nechifor

Electrotehnica, Electronica, Automatica, Volume 68, Issue 3

The paper puts in perspective the aspects of classic valve construction and the use of off-the-shelf products in order to improve the valve’s features in terms of user interface, valve status in operating conditions and control interface to classic standardized communication protocols, such as EtherCAT®, ProfiBUS®. Because the resulting products are meant to be functional prototypes, most parts used for implementing new features will not be fully developed as for a sellable product, but only to the stage of proof-of-concept. To fully develop the used equipment will imply a dedicated study, which would allow the shift from general purpose use development boards and breakout sensor boards to application-specific equipment designed for assembly line manufacturing. The same study includes the use of Internet-of-Things in industrial environment and will be the subject of separate and dedicated article. The paper only mentions the possibility and ways of achieving future design ideas.

Performance analysis of brushless motors with segmented cores considering manufacturing constraints

Andrei DUMITRU, Bogdan VĂRĂTICEANU, Paul MINCIUNESCU

Electrotehnica, Electronica, Automatica (EEA), 2020, vol.69, no. 1

Brushless servomotors are widely used in industry and in all domains that require precise and easy position/speed/torque control. To further improve the performance of these motors, the segmentation of the stator core is taken into account. This approach to core construction provides a high slot fill factor, compact design and efficient use of materials. This paper aims to present that the manufacturing constraints and tolerances of this particular core construction can increase unwanted effects in brushless motors, like cogging torque, torque ripple and their influence regarding the back-EMF.Two models for a 12slots-10 pole configuration, one with segmented core and one with standard laminated core are compared and analyzed using the FEA (Finite Element Analysis) method. The influence of the additional air gaps that occur in such constructions is investigated to provide an overview for the design of segmented motors. Various lenghts for air gaps between the segments of the core are taken into consideration and non-uniform distribution of such gaps. The paper also provides further steps than must be taken in order to verify/validate the studied model’s inpact on motor design.

Electromagnetic and mechanical analysis of a modular outer rotor synchronous reluctance machines for light propulsion vehicles

Nicolae-Florin Jurca, Razvan-Alexandru Inte, Dan-Cristian Popa, Bogdan Varaticeanu, Paul Minciunescu, Claudia Martis

IEEE Transactions on Transportation Electrification

This paper presents the optimal design from the electromagnetic and structural point of view of a fault tolerant modular outer rotor synchronous reluctance machine, a not previously constructed topology. Two new topologies with the rotor in modular construction, one with each pole of the rotor can be considered as a separate module and a segmented one, where each rib of a module can be considered as independent, are compared with a classic structure. The electromagnetic analysis is carried out using FLUX 2D software. The main studied parameters are electromagnetic torque, torque ripple content, saliency ratio and power factor. In order to optimize the power factor of the machine, a co-simulation procedure is carried out for each structure, by employing a MATLAB and FLUX 2D coupling. Based on the obtained performances, the best topology is selected. Further, a mechanical analysis is performed to determine if the new proposed rotor meets the structural integrity at rated speed and to establish the maximum speed value that can be attained such that the structural failure of the rotor is prevented. A modular outer rotor synchronous reluctance machine is designed and built. Experimental results of testing the prototype are given to confirm the validity of the proposed machine.

PMASynRM late design-stage rotor shape NVH optimization

Sebastian Ciceo; Fabien Chauvicourt; Bogdan Varaticeanu; Johan Gyselinck; Claudia Martis

2020 International Conference on Electrical Machines (ICEM)

Electrical machine electromagnetic-caused noise and vibration represents an ever-increasing target for machine-designers. A novel late design-stage NVH optimization method using the full rotational velocity synthesized vibration-response map is proposed. This is assisted by a target-setting method for the most important force harmonics using a force sensitivity analysis. The procedure is applied on a PMASynRM used for light traction applications, where the rotor cross-section is modified by introducing notches and saliency. The results for different percentages of permitted decrease in average show that both resonances and individual frequency orders can be directly targeted and minimized.

SYNCHRONOUS ELECTRIC MACHINE WITH PERMANENT MAGNETS IN HALBACH CONFIGURATION WITH STATOR WITHOUT MAGNETIC JUG AND EXTERNAL ROTOR FOR SPECIAL APPLICATIONS

Bogdan Dumitru VĂRĂTICEANU, Paul MINCIUNESCU, Andrei Emanuel DUMITRU și Lucian Nicolae DEMETER

SME’20 – NEWS AND PERSPECTIVES IN THE FIELD OF ELECTRIC MACHINES, 16th EDITION

The paper describes a synchronous electric machine with permanent earth magnets in Halbach configuration, with external rotor and stator with coils without magnetic iron yoke. This electric machine is designed for applications with special requirements in terms of parasitic torque of zero magnetic clamping, significantly reduced electromagnetic torque ripple, short axial length relative to the size of the outer diameter, high rotor inertia and high energy efficiency. The finite element method (FEM) is used to analyze the structure of the electric machine and to estimate its performance.

Environment, Modeller of the Mankind Existence (Part 2)

Eugeniu Alexandru STERE, Ionel POPA

EEA 2017 | vol. 65 | nr. 2 | art. 23

The paper presents some of the actions intented to attenuate the negative influences of anthropic activities. The paper remembers too, the most important actions regarding the global environment protection under the aegis of United Nations Organization and the disappointment offer the inefficiency of the sustainable development actions, who affected the environment, the main objective of the sustainable development. A recent hope was generated by the project of the greenhouse gases (GHG) reduction by the accord between 197 states of the world, at Paris Climate Change Conference, in 2015. The first countries of this accord were United States and China. There are revealed too, the destroyer natural phenomena, very dangerous for the future of mankind. Recent researches explain the major influence of the natural factors (terrestrial and cosmic) on the natural environment of Earth and finally of the mankind existence.

Advanced Monitoring and Control Architecture for Lowering the Energy Consumption of Non-Residential Buildings

Bogdan ONOSE

EEA 2017 | vol. 65 | nr. 2 | art. 1

This paper presents a real case implementation of a proportional integral derivative controller (PID) into a building energy management system (BEMS). The case study building was done in the ICPE Office Building located in București, Romania. The goal of the implementation was to improve the indoor comfort level and maximize the energy efficiency of the heating system of the building. The algorithms developed are based on a series of chained PID control loops that manage the modularity of different heating system components. Also a parallel PID control loop was developed to further improve energy savings in the south area of the building. With the implementation of all PID’s control loop the heating system has an increased efficiency based on modulating the heating source from district heating system (DHS) and modulating the heating distribution into the building. The results show that energy efficiency is capable even with maintaining the indoor set point temperature and comfort level.

The Bioactive Compounds, Antioxidant Capacity, and Color Intensity in Must and Wines Derived from Grapes Processed by Pulsed Electric Field

Simona Ioana VICAȘ, Livia BANDICI, Alin Cristian TEUȘDEA, Valer TURCIN, Dorin POPA, Gheorghe Emil BANDICI

CyTA – Journal of Food, Volumul 15, 2017

The aim of this work was to study the effect of pulsed electric field (PEF) treatment on the content of bioactive compounds (total phenols, total flavonoids, monomeric anthocyanin content), antioxidant capacity, color intensity (CI), and sensory quality of wines derived from three varieties of grapes (Muscat Ottonel, Pinot Noir, and Merlot). PEF treatment resulted in an increase in all bioactive compounds, and consequently, an increase in their antioxidant capacity, which was evaluated by different methods. Applying PEF treatment to red grapes resulted in obtaining wines with higher CI compared to the control sample. For a better interpretation of the results and a proper discrimination of the samples in terms of the variety of grapes and PEF treatment, multivariate analyses, such as the principal component analysis, multivariate analysis of variance, and hierarchical cluster analysis, were applied.

The Environment: Modeller of the Mankind Existence (part 1)

Eugeniu Alexandru STERE, Ionel POPA

EEA 2017 | vol. 65 | nr. 1 | art. 14

The paper presents some actions intended to attenuate the negative influences of anthropic activities. The paper remembers too, the most important actions regarding the global environment protection under the aegis of United Nations Organization and the disappointment offer the inefficiency of the sustainable development actions, who affected the environment, the main objective of the sustainable development. A recent hope was generated by the project of the greenhouse gases (GHG) reduction by the accord among 197 states of the world, at Paris Climate Change Conference, in 2015. The first countries of this accord were United States and China.

High Speed Induction Motor Used in Electric Vehicles

Dan-Cristian POPA, Bogdan VĂRĂTICEANU, Daniel FODOREAN, Paul MINCIUNESCU, Claudia MARTIS

EEA 2016 | vol. 64 | nr. 3 | art. 1

This paper presents some aspects related to the performances of a high-speed induction motor used for the propulsion of an electric vehicle. For the construction of the rotor cage of a 20 kW machine operating at a rated speed of 26000 rpm, both aluminium and copper were used. A comparison among these structures both from the electromagnetic and mechanical point of view, based on an analytical, but mainly numerical analysis, was performed. The differences among these structures, underlining the advantages and shortcomings of the use of the two conductor materials, are discussed in detail in the paper. The performed numerical analysis validates the analytical choices from the electromagnetic point of view and shows the major differences between the two variants from the mechanical point of view.

Synthesis, Properties and Fungal Degradation of the Cellulose - Castor Oil Based Polyurethane Composites

Ștefan OPREA, Violeta Otilia POTOLINCĂ, Petronela GRĂDINARIU, Aurora JOGA, Bica ZORLESCU, Veronica OPREA

Proceedings of International Conference on Green Chemistry and Sustainable Engineering, Rome (Italy)

Three-Dimensional Modelling of a DC, Limited Angle, Torque Motor of Size 16 - 2

Ioana IONICĂ, Mircea MODREANU, Alexandru MOREGA, Cristian BOBOC

Conferință și Expoziție Internațională în Energetică și Inginerie Electrică, EPE, Iași, 2016

This paper is concerned with three-dimensional modelling for a DC Limited Angle Torque Motor using the finite element method, in the design stage. The results of the three-dimensional model are compared with those of a commonly used, simplified, bi-dimensional model, and the advantages are outlined and discussed. The 3D numerical simulation results are then verified against the experimental model with the aim to validate the benefits and accuracy of using the FEM analysis in the design phase of the prototype fabrication.

Silver Nanoparticles Synthesis and Applications

Ionel POPA, Ioana Maria NICOLA, Victoria CEARĂ, Cristian BOBOC, Cristiana Alexandra DANEȘ

EEA 2016 | vol. 64 | nr. 2 | art. 15

The nanoparticles had become, more and more, important for the humankind. The silver is known to be an useful metal for the human organism, it can be effective against a broad range of microorganisms. In this specific article, are presented – synthesis through different methods (physical, chemical and bio.

Performance Comparison Between Surface, Spoke and Interior Permanent Magnet Machines Designed for Traction Applications

Bogdan VĂRĂTICEANU, Paul MINCIUNESCU, Constantin NICOLESCU

Rev. Roum. Sci. Techn. – Électrotechn. et Énerg., Vol. 61, 1, pp. 3–7, Bucharest

Three types of high-performance permanent magnet (PM) machines have been designed and analyzed in order to determine the ideal candidate for high speed traction application. The surface PM machine, spoke PM machine and interior PM machine were compared in terms of performances and capabilities at high speed operation. Finite element analysis was used for accurate performances prediction. For the sake of accuracy, the amount and type of PM and the stator structure are maintained the same in the design process for all three machines.

Constructal Analysis of Thermal Flows in Electrical Machines

Nicolae VASILE, Floarea VASILE, Ramona CHIRESCU, N. FIDEL

Revista SEEEF Universitatea „Valahia” Târgoviște

This paper presents an analysis of how the constructal theory could be applied to construction in optimizing the mass and volume of electrical machines, taking as essential fluid flow of heat produced by the energy losses developed within them.

Three-Dimensional Modelling of a DC, Limited Angle, Torque Motor of Size 16

Ioana IONICĂ, Mircea MODREANU, Alexandru MOREGA, Cristian BOBOC

Simpozionul de Mașini Electrice SME’16, 2016

In this paper we propose the presentation of three-dimensional numerical models and analysis of the results obtained for a DC limited-angle torque motor. The results of the three-dimensional modelling are compared with the results of a two-dimensional modelling. Accuracy tests were performed to validate the numerical results obtained, and a three-dimensional model was established, the results of which are compared to experimental results. Numerical modelling offers the possibility of evaluating different configurations of DC limited-angle torque motors.

Increasing Energy Efficiency Throughout Simulation Based Control for Non-Residential Existing Buildings

Bogdan-Alexandru ONOSE, Viorel URSU, Lucian Nicolae DEMETER

WEC CENTRAL & EASTERN EUROPE REGIONAL ENERGY FORUM – FOREN 2016, 12-16 June 2016, Vox Maris Grand Resort, Costinesti, Romania

This paper presents the objective of the Energy IN TIME (EiT) project of developing more advanced control method for existing non-residential buildings. This approach will be based on advanced building simulation models to reduce the energy consumption and energy bill. The project methodology will cover the most accurate and up to date international standards for energy efficiency.

Design of Matrix Converter for Modern Civil Aircraft Systems based on MEA Concept

M. NEACȘU, F. MARIUȚ, V.S. STANCIU, G.V. RÂȘNOVEANU

EEA 2015 | vol. 63 | nr. 4 | art. 3

Electro Mechanic Components for High-Tech Direct Drive Systems Developed Using Flexible Production Lines

Paul MINCIUNESCU, Mircea MODREANU

EEA 2015 | vol. 63 | nr. 4 | art. 1

In this paper, it is analysed the research project with title electro mechanic components for high-tech direct drive systems developed using flexible production lines. General data, objectives, capacity of realization are presented. The authors insist on the obtained results: one series of torque motor with sub-series- one series of torque motors with brushes and one series of limited angle torque motors, one series of direct drive rotary electric machines and one series of direct drive linear machines. The products proposed in the present project are built with flexible technological lines, which allow rapid execution with minimum costs of high-tech electric machines short series with different characteristics.

Performance Evaluation of Permanent Magnet Assisted Synchronous Reluctance Motor for Micro Electric Vehicle

Bogdan VĂRĂTICEANU, Paul MINCIUNESCU, Silviu MATEI

19th International Forum on Advanced Microsystems for Automotive Applications (AMAA 2015)

A 7.5 kW Permanent Magnet Assisted Synchronous Reluctance Motor (PMASynRM) that works with ferrite magnets has been designed for a micro electric vehicle. Finite element analysis is used to evaluate machine performances and to study the demagnetization effect of ferrite PMs. An experimental validation of the PMASynRM characteristics is made. The measured values of the back electromotive force and torque are compared with the numerical predicted values. The PMASynRM electromagnetic losses are investigated in order to increase the motor efficiency.

Modeling and Analysis of Dual-Sided Coreless Linear Synchronous Motor

Bogdan Dumitru VĂRĂTICEANU, Paul MINCIUNESCU

Rev. Roum. Sci. Techn. – Électrotechn. et Énerg., 60, 1, p. 17–27, Bucharest, 2015

Numerical Studies on a DC, Limited Angle, Torque Motor

Ioana IONICĂ, Mircea MODREANU, Alexandru MOREGA

Conference on Electromechanical and Power Systems, SIELMEN, Chișinău, 2015

The paper aims to analyse and develop numerical models for the DC Limited Angle Torque Motors of TQR-16/2-B type that are important in their construction. Measurements carried on an experimental model are used for validation of numerical model and compares well with the numerical simulation results.

Bio-Polyurethane Materials obtained from Renewable Sources

Aurora JOGA, Victoria CEARĂ, Bica ZORLESCU

EEA 2015 | vol. 63 | nr. 4 | art. 7

Research works carried out were oriented synthesis in the laboratory of experimental models of vegetable polyols needed to achieve matrix bio-polymeric create bio-composites based on natural fibres, characterization and testing patterns obtained. Bio-composites were obtained from polyurethanes with high content of crude vegetable oils or modified, consolidation based support lignocellulose fibres, whose mechanical properties were improved. The main interest in studying these bio-composites is because fibres and polymer matrix derive from renewable resources.

PV OFF-grid Mobile Power Supply System for Remote and Rural Application

Lucian Nicolae DEMETER, Bogdan-Alexandru ONOSE, Viorel URSU

SWIC 2015 – International conference for solar and wind energy, October 1 – 3, 2015 at Icpe Solar Park in Bucureşti

The paper presents a study on the performances of a PV off-grid mobile supply system designed for low-power applications. The solution can solve energy supply demand in remote application, rural application and can represent a solution for efficient irrigation.

Solar and Bio Hydrogen Production Used for Fuel Cells Energy Conversion System

Sandor BARTHA, Lucian Nicolae DEMETER, Viorel URSU

SWIC 2015 – International conference for solar and wind energy, October 1 – 3, 2015 at Icpe Solar Park in Bucureşti

The paper presents aspects of the hydrogen technology production using eletrolysis. Laboratory tests were done using an electrolyser connected to a photovoltaic energy conversion system. The worldwide growing energy consumption can be assured using renewable energy resources. CO2 emission reduction can be achieved by reducing dependence on fossil fuels. Based on statistical data and predictive models, solar energy is one of the most important renewable energy resources that has the potential to meet all energy needs in line with current trends. To generate 20 TW of power from the sun is necessary to cover an area of 816.000 km2 with PV modules. (Gratzel, M, 2011, Lewis 2006). The intermittent nature of solar energy can create difficulties for network operators, and converted energy should be stored in dedicated storage systems, which will ultimately increase the price of electricity. One way to solve these problems is to replace fossil fuels with hydrogen. The most important source for hydrogen is water, a convenient and abundant hydrogen resource. If the world energy consumption will be based on energy stored in hydrogen that can be assured from about 3.5 x1013 l water. This corresponds to 0.01 % of the annual rain fall or 0.000002% of the amount of water in world oceans.

Updating the Qualifications in the Electrical Field and Improving the Quality of Continuing Vocational Training Through POSDRU Funding

Floarea VASILE

Conferința națională de constituire a Rețelei multiactor New SOLAR în cadrul proiectului POSDRU: Noi standarde ocupaționale pentru o economie orientată spre o dezvoltare durabilă și economisirea resurselor energetice – NEW S.O.L.A.R, București, 23-24 noiembrie 2015

Study of a High-Speed Motorization for Electric Vehicle Based on PMSM, IM and VRSM

D. FODOREAN, D.C. POPA, Paul MINCIUNESCU, C. IRIMIA, L. SZABO

International Conference on Electrical Machines, ICEM, 2014

Prerequisites for Sustainable Development

D. Ionel POPA, Eugeniu Alexandru STERE, Sanda Liana COTESCU

EEA 2014 | vol. 62 | nr. 1 | art. 14

The paper presents the preliminaries of the sustainable development, that began after the Second War World by the ecological actions and continued, after 1980, by a new type of development conception. Under the aegis of the United Nations, in 1987, the report ”Our Common Future” officialized the sustainable development concept, named the Brundtland concept too. The report was the ground for the first programmes regarding the sustainable development, presentede and recommended at the ”Earth Summit” from Rio de Janeiro in 1992. The anaysis of the above mentioned preliminaries cempletely explain the complexity of the development problems, and justify the necessity of a morale and spiritual reform of the whole humanity, beside a new social, political, economic, financial and military reforms.

A Novel Brushless Motor/Generator for Electric Vehicles

Bogdan VĂRĂTICEANU, Paul MINCIUNESCU, Stelian MARINESCU, Virgil RACICOVSCHI

8th International Symposium on Advanced Topics in Electrical Engineering (ATEE), Bucharest, Romania, 2013

The paper describes a novel permanent magnets brushless machine with double-gap, two rotors and axially aligned stator poles. The stator coils are separated from each other to encourage airflow around the conductors for more effective cooling and to separate the phases. Finite element analysis is used to determine the electromotive force. The new configuration provides numerous advantages in comparison with classic construction: lower weight, lower permanent magnet weight, higher efficiency, better cooling, lower inertia.

Pulsed Electric Field Analysis for an Efficient Intracellular Fluid Extraction Using Electro-Plasmosis

Ion BÂRSAN, Marius-Aurel COSTEA, Mihai MARICARU, Valer TURCIN, George-Marian VASILESCU

EEA 2015 | vol. 63 | nr. 4 | art. 4

The electro-plasmolysis is a modern procedure used in order to extract useful liquids located in the cell membrane. The computation of the electric field necessary to breakdown the cell membrane requires the solution of an intricate electro-quasi-stationary electromagnetic field problem. Using commercial finite element software is particularly difficult because of the threads involved by adapting the discretization mesh to the membrane thickness, which is very small compared to the cell size. This paper proposes a qualitative analysis of the behaviour of the electric field in the cell.

Design of Direct Matrix Converter for Modern Civil Aircraft Systems Based on MEA Concept

Mihăiță Gabriel NEACȘU, Felix MĂRUȚ, Viorel Șerban STANCIU, Gabriel RÂȘNOVEANU

EEA 2015 | vol. 63 | nr. 4 | art. 3

Within the More Electric Aircraft (MEA) concept, the aerospace world has found the possibility to reduce or to replace traditional pneumatic and hydraulic systems with lighter and more reliable electric systems. Important changes are made to the electric generation and distribution system with a trend of leaving the constant frequency AC energy distribution in favour of variable frequency. The matrix converters (MC) represent a more efficient and reliable solution to replace the standard V-BBC (Voltage link Back to Back Converter); however the control required is more sophisticated. This paper presents an overview of modulation and control of MC and an important part of the paper is dedicated to the power converter design. Finally, a simulation using Matlab-Simulink environment and tests are presented on a laboratory prototype.

Numeric Modelling of a Vehicle Equipped with an Electric System

Nicolae MOCIOI, Alexandru BUMBU

EEA 2015 | vol. 63 | nr. 4 | art. 6

Equipping of land vehicles or boats with a fully electric drive leads to expansion of the main technical characteristics and versions. Whether propulsion is accomplished on water or land, a vehicle electrical composition will be power supply, electric propulsion system, energy flow management system, command, and control system. In this paper, we present a numerical model of a vehicle electrical characteristic using Excel, or Matlab environments.

Electrical Contact Materials Obtained by Spark Plasma Sintering Technology for Vacuum Contactors

Violeta TSAKIRIS, Elena ENESCU, Magdalena LUNGU, Mariana LUCACI, Alexandru RADULIAN, Dorinel TĂLPEANU, Gabriela SBÂRCEA, Alina CARAMITU, Virgil MARINESCU, Ion IOANA

9th INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING, May 7-9, 2015 Bucharest, Romania, DOI: 10.1109/ATEE.2015.7133851, ISSN: 2068-7966

Contact materials from W-Cu, W-Ag and WC-Ag systems obtained by spark plasma sintering technology to be used as electrical contacts for vacuum contactors were developed. The electrical contact materials have been obtained from homogenized powder composite mixtures of W-Cu (70-30, 60-40), W-Ag (70-30, 60-40), and WC-Ag (70-30, 60-40), by spark plasma sintering technology, in vacuum, under pressure of 50 MPa in the 900-1050 °C sintering temperature range, at a constant dwelling time of 5 minutes and a heating/cooling rate of 100°C/min. The physical, microstructural, electrical, mechanical and functional properties of the obtained electrical contact parts of 20 mm in diameter and 4÷5 mm in height were investigated in respect to chemical composition and sintering temperature. All the analyzed electrical contact materials have shown near fully dense and homogeneous microstructures with enhanced physical, mechanical, electrical and functional properties. Best performances have been obtained on the electrical contacts from WC-Ag with 40 wt. % Ag which had the lowest degree of porosity (4.77 %), the highest value of Vickers hardness (220±3 HV), the highest value of Young’s modulus (180±5 GPa), the lowest value of electrical resistivity (4.65 μΩ·cm) and the lowest value of the medium chopping current (0.59 A).

WC-Cu Electrical Contacts Developed by Spark Plasma Sintering Process

Violeta TSARKIRIS, Elena ENESCU, Alexandru RADULIAN, Mariana LUCACI, Magdalena LUNGU, Nicolae MOCIOI, Lucia LEONAT, Diana CÎRSTEA, Alina CARAMITU

Electrical contact materials WC-based to be used as electrical contacts for vacuum contactors were developed by spark plasma sintering process. The electrical contact materials were developed from homogenized powder composite mixtures of WC-Cu (60-40) and WC-Co-Cu (59.5-0.5-40), which were spark plasma sintered in vacuum, in the interval of temperatures of 1015-1045 °C, under 50 MPa pressure and a dwell time of 300 s, at a heating rate and a cooling rate of 100°C/min. The obtained electrical contact pieces of 20.5 mm in diameter and 3 mm in height were investigated from the physical, microstructural, electrical, mechanical and functional properties point of view. At optimal sintering temperatures (1035°C-1045°C) and the same dwell time (300 s), we have obtained electrical contact pieces with homogeneous microstructures and excellent physical and mechanical properties for both studied systems. We have obtained best performances on the electrical contacts from WC-Cu with 40 wt.% Cu which had low degree of porosity (5.16 %), high value of Vickers hardness (226±5 HV), high value of Young’s modulus (160±2 GPa) and the lowest values for electrical resistivity (4.35 μΩ×cm), chopped current (1.76 A) and standard deviation (0.37%). A small amount of sintering additive (0.5 wt%Co) to the WC-40wt% is helping to increase the densification degree and mechanical properties but decreases electrical properties and also, increases the functional parameters. Thus, in compare with the WC-40wt.%Cu electrical contacts, the chopped current for the WC-0.5wt.%Co-40wt.%Cu is increasing with 16%.

Fungal Degradation Behavior of Two Series of Polyurethane Urea Composites Obtained by Different Silver Incorporation Methods

Ștefan OPREA, Petronela GRĂDINARIU, Aurora JOGA, Bica ZORLESCU, Veronica OPREA, Violeta Otilia POTOLINCĂ

Journal of Elastomers and Plastics

This research shows the fungal degradation behavior of two series of composites: a series obtained with silver powder incorporated in sulfadiazine (SD)-based polyurethane urea and another series of composites that incorporates silver through polyurethane chain extension with silver SD. This article reports on the chemical structure variations characterized by Fourier transform infrared (FTIR) spectroscopy and the mechanical properties of these polymers before and after fungal exposure. Although silver SD—used as a chain-extender—ensures a more orderly dispersion of the silver throughout the hard segment of the polyurethane urea main chain, the FTIR results showed some changes on the surface of these composite films. Both silver composites exhibited higher fungal biodegradation resistance.

Environment: primordial condition for a sustainable future (Part 1)

Eugeniu Alexandru STERE, Ionel POPA

EEA 2015 | vol. 63 | nr. 4 | art. 13

During the last half a century, the environment became a global feature of the world. The United Nations Environment Programme (UNEP), which started more than forty years ago, after the continuous aggravated environmental issues as: ecological disasters, nuclear explosions and accidents, the use of very toxic substances, the ozone layer depletion, transboundary pollutions, etc. Under the aegis of the United Nations, the sustainable development programme (Agenda 21), which started twenty years later, made also a normal link between the development and environment. The sustainable development included the main factors of life and survival (peace and security, population control, eradication of extreme poverty and hunger, natural resources protection, protection of species and ecosystems, management of oceans and space, etc.).

Preliminaries of the Durable Development

Ionel POPA, Eugeniu Alexandru STERE, Sanda Liana COTESCU

EEA 2014 | vol. 62 | nr. 1 | art. 14

The paper presents the preliminaries of the sustainable development, that began after the Second War World by the ecological actions and continued, after 1980, by a new type of development conception. Under the aegis of the United Nations, in 1987, the report „Our Common Future” officialised the sustainable development concept, named the “Brundtland concept” too. The report was the ground for the first programs on the sustainable development, presented and recommended at the „Earth Summit” at Rio de Janeiro, in 1992. The analysis of the above mentioned preliminaries completely explain the complexity of the development problems, and justify the necessity of a moral and spiritual reform of the whole humanity, besides a new social, political, economic, financial and military reforms.

Icpe Partner in Energy IN TIME (EIT) Project

Bogdan Onose, Cristian Boboc

EEA 2014 | vol. 62 | nr. 2 | art. 11

This paper presents the Energy IN TIME (EIT) project that is aimed to develop a Smart Energy Simulation Based Control method to reduce the energy consumption and energy bill in the operational stage of existing non-residential buildings. The concept that lies behind the Energy IN TIME approach is the use of more accurate building simulation models able to represent buildings’ complexity and uncertainties for building control and operation while generating forecasted information. The project goes beyond existing building control techniques, mainly demand-response based, developing an integrated control & operation approach that will combine the state of the art modelling techniques and simulation software. Energy IN TIME integrated solution will be validated on a number of existing buildings where the service will be provided. These buildings will be in different Europe locations with different climates.

Computer Aided Measurement System for the Characterization of Limited Angle Torque Motors

Mihail-Iulian ANDREI, Mircea MODREANU, Mihai GUȚU, Liviu GHIȚULESCU, Dumitru VĂRĂTICEANU

EEA 2014 | vol. 62 | nr. 3 | art. 1

The diversity of products fabricated by Icpe enforce us to increase the flexibility within the electric test division. Regardless of the motor stage, experimental model, prototype or series product, a flexible system for the measurement of on load torque is required. Due the fact that indirect methods do not take into account some special effects, a measurement system based on direct methods with torque transducer is recommended to be used. This paper presents such a computer aided measurement system for the caracterization of limited angle torque motors.

Official Adoption of the Sustainable Development Programme

Eugeniu Alexandru STERE, Ionel POPA

EEA 2014 | vol.62 | nr. 4 | art. 14

The paper describes the activities which preceded the „Earth Summit” held at Rio in 1992 and the documents analysed and voted by the leaders of the States and delegates. It was presented too the content of the sustainable development programme, named Agenda 21, Rio Declaration regarding the rights and the obligations of the States and the Declaration on the biological diversity (biodiversity). There were, finally, mentioned some interesting data which can stimulate the sustainable development achievement and also data which can delay this achievement. No wonder that every five years further was necessary to be organized other Summits and working teams or committees.

The Change, is it a Risk? `{`An Essay About Entropy and the Risks of Change`}`

Floarea VASILE

EEA 2013 | vol. 61 | nr. 1 | art. 9

Recent years the world has been in continuous change. This has been caused by the economic crisis. Changes in the external environment of an organization can decisively influence its internal one. A parallel can be drawn between this type of interaction and The Second Principle of thermodynamics, which describes the balance between two environments influencing each other. If an organization’s external environment is out of balance, meaning that it has a higher level of entropy, the entropy of its internal environment will increase as well, However, the risk of external instability can become an advantage for an organization that has a working risk management system. A risk management system can control risk, thus transforming it into an asset.

Performance Evaluation of Some Compact Fluorescent Lamps Equipped by Electronic Ballasts Based on Specialized Integrated Circuits

Constantin IVANOVICI, Ionel POPA, Nicolae GOLOVANOV, Eleonora TIPU

EEA 2013 | vol. 61 | nr. 2 | art. 7

The present paper deals with the studies performed by the specialists in ICPE who have made compact fluorescent lamps (CFL) with improved technical characteristics compared to the existing products. The electronic ballast was redesigned with specialized integrated circuits. There have been developed 16 types of compact fluorescent lamps (CFL) with various powers from 32 W to 85 W by using five power schemes of the CFL’s based on five integrated circuits. In order to assess the CFL’s, which were made by ICPE there have been analyzed their main performances such as the maximum temperatures on the lamp and the plastic housing and the main technical characteristics: the power factor λ, the waveform THDI and the power consumption of the network. We mention that the obtained performances are superior to the similar products of the domestic and foreign markets.

Energy Audit for a Painting Hall

Mihai HANEK, Cornel JIVAN

EEA 2013 | vol. 61 | nr. 3 | art. 9

This paper presents a part of the energetic audit for a painting hall. The audit was done first for assessing the energetic demands of the air conditioning units used for conditioning the air in the painting hall and second for assessing the overall energy consumption. The painting hall is used for painting large sections of metal parts. There were analyzed the structure of the building, the conditioning units and the process of conditioning the air correlated with the technological process in order to propose modern energy efficiency solutions. The audit finished with an efficiency solution. It was mounted an automatic control system for the air conditioning units.

W-Cu Composite Materials for Electrical Contacts Used in Vacuum Contactors

Violeta TSARKIRIS, Magdalena LUNGU, Elena ENESCU, Dan PAVELESCU, Gheorghe DUMITRESCU, Alexandru RADULIAN, Viorel BRAIC

VIth International Conference of Scientific Computing in Electrical Engineering SCEE Journal of Optoelectronics and Advanced Materials,Vol. 15, No. 9 – 10, September – October 2013, p. 1090 – 1094

W-Cu composite materials for electrical contacts to be used in low voltage vacuum contactors were synthesized by means of powder metallurgy (P/M) and infiltration technique. The compacting pressure and sintering temperature were selected in order to achieve the desired skeleton density. Direct infiltration on green compacts of W-Cu-(Ni) was made by using different elements such as Cu and Ag. The influence of chemical composition, nature of infiltrating element and processing parameters on microstructures, and electrical, mechanical and functional properties were emphasized.

Modeling an Electromagnetic Device with Permanent Magnets Using the Finite Element Method

Alexandru RADULIAN

EEA 2012 | vol. 60 | nr. 1 | art. 10

The electromagnetic device with NdFeB permanent magnet is designed to replace traditional mechanical drive system of the VCB vacuum circuit breakers and DC circuit breakers. It has the following advantages: simple structure, small gauge, a high force in the closed position, high mechanical life and is easy to maintain. This paper presents the modeling, simulation and optimization of electromagnetic device using 2D finite element method.

Connecting The Photovoltaic Installations to the Public Network

Paul PENCIOIU, Nicolae GOLOVANOV

EEA 2012 | vol. 60 | nr. 2 | art. 8

Increase installed capacity of photovoltaic installations to values according a conventional power plant necessitate the conditions analysis of the photovoltaic power can work in the public network, without reducing the electricity quality supplied to users connected to the network, and without being affected by disturbances in the network. It is also necessary to know how these plants can participate in system services necessary for safe operation of power system. The paper analyzes the main disturbances that can result from the operation of a photovoltaic power plant in the public network, the conditions for such plants to coexist with the power system and some of the solutions that can be taken to provide specific operational indicators to the source energy power system. It specifies that, that, although they have a specific operating system, the photovoltaic plants connected to the network for more than 10 MW installed capacity, are subject to the same conditions as any power plant in the power system.

Photovoltaics Based Energy Sources and Energy Storage Systems for Small and Residential Buildings

Paula ANGHELIȚĂ, Viorel STANCIU

EEA 2012 | vol. 60 | nr. 2 | art. 13

Climat changes and environment degradation are nowadays important problems that trigger important efforts of the worldwide research to to be focused on finding suitable solutions to solve these issues. Energy generation using renewable sources, represent modern and ecofriendly solutions that can contribute to overcome the pollution problem, with a wide range of practical applications. In this paper will be presented the main results obtained in the frame of the European Research Project RO0054/2009 (EEA Grant) entitled: “ Integrated micro CCHP-Stirling Engine based on renewable energy sources, for the isolated residential consumers from South-East region of Romania”.

Transportation System Based on Light Electric Vehicles

Grigore DANCIU, Virgil RACICOVSCHI, Mihaela CHEFNEUX, Liviu Kreindler

EEA 2012 | vol. 60 | nr. 4 | art. 1

The mobility needs of the modern society are in a continuous growth. On the other hands, people need comfort, and on the other hand clean, safe, and cheap transportation conditions. Following this idea, the authors produced a “bike-sharing” transportation system, based on light electric vehicles, such as bikes, mopeds, and scooters. The present paper presents this system and analyzes it from a practical point of view.

Les Oscillations Haute Frequence du Courant Post-Arc dans le Vide

Dan PAVELESCU, Smaranda NIȚU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

Proceeding of the VI-th International Conference on “Fluctuations des Arcs”, 17-18 Martie 2003, pag. III-10-III-17, Clermont Ferrand, FRANCE

Precedents of the Sustainable Development

Ionel POPA, Eugeniu Alexandru STERE, Sanda Liana COTESCU

EEA 2013 | vol.61 | nr. 4 | art. 10

Started twenty years ago, under the aegis of the United Nations, the sustainable development is not strong enough to replace the actual industrial development. However, it remains the single way for the future of humanity. Until now, in spite of programmes and multitude of actions, the real progresses in the field of sustainability are too small. More, the current worldwide situation continually worsens by the number and intensity of crises. Even the General Secretary of UN, recently recognized some of the severe crises of the present. Unfortunately, the sustainable development cannot be applied, without a moral and spiritual reform of the humanity. This paper analyses some of the obstacles in the way of new type of development, by its own features and the negative precedents continually accumulated during the world evolution.

Efficient Lighting System with CFL's Electric Circuit Based on Integrated Circuit IRS2168D

Nicolae GOLOVANOV, Constantin IVANOVICI, Ionel POPA, Radu PORUMB, Elena ȚIPU

EEA 2012 | vol. 60 | nr. 4 | art. 14

This paper reviews the possibility of using specialized integrated circuit IRS2168D to create an electronic ballast for high frequency supply of compact fluorescent lamps (CFL) with power range of 15•••105 W. The proposed scheme enables the improvement of main electric characteristics of lamps, such as electric current waveform, THDI factor, power factor, power imput and electromagnetic compatibility. A feasibility study was also developed, on the possibility of domestic manufacturing of such lamps, and placing them into a competitive market.

Analysis and Survey of Multi–Phase Power Electronic Converter Topologies for the More Electric Aircraft Applications

R. BOJOI, M. NEACȘU, A. TENCONI

International Symposium on Power Electronics, Electrical Drives, Automation and Motion (Speedam), June 2012

To improve aircraft efficiency, reliability and maintainability, the aerospace world has found in the progressive electrification of on-board services the way to reduce or to remove the presence of the hydraulic, mechanical and the bleed air/pneumatic systems. This concept is called the More Electric Aircraft (MEA), which involves the introduction of the electromechanical actuators and the electrohydraulic actuators. Also the entire electrical generation and distribution system is subject to radical revisiting, with a trend which is leaving the constant frequency AC energy distribution in favor of variable frequency or DC solutions. The literature reports survey papers regarding the electrical machines and their electromechanical design for the MEA but only a few papers presented a survey analysis of the power electronic converters employed for aircraft applications. The paper presents a review of power electronics converters topologies which can be used in more electric aircraft, with a particular focus on multi-phase drive systems.

A New Vector Boundary Elements Procedure for Inductance Computation

R. Mihai MARICARU, Paul MINCIUNESCU, Ioan R.CIRIC, Marian VASILESCU

Revue roumaine des sciences techniques Série Électrotechnique et Énergétique, 2011, issue 2

This paper presents a new method for solving the integral equation of magnetic vector potential on the surfaces of perfect conductor bodies. The definition of magnetic flux of ideal coils implies that these are perfect conductors, so the normal component of magnetic flux density on their surfaces is equal to zero, which is equivalent with enforcing a zero normal component of magnetic vector potential A and the circulations of A on any closed path on their boundaries, only those surrounding the holes being equal to magnetic fluxes. A and curl A are described by a linear combination of special vector functions associated with the surface nodes. The integral equation is projected on these functions, as well as on another set of specialized functions orthogonal on the first set. The small number of unknowns is a great advantage of the proposed method.

Renewable Power Effect on Distribution and Transport Grids

Cornel JIVAN

EEA 2012 | vol. 60 | nr. 2 | art. 5

Renewable energy sources are in development and generally promoted by all national energy politics based on European strategy of limiting emissions and promoting green energy. Modeling the effects of some independent green sources on the transport and distribution power grids underlines a new problem and generates new techniques of adjustment and management. After various modeling simulations during the study, the renewable sources can generate serious power grid falls and provoke even black-outs increasingly seen all over the world. The article puts up a real problem of management and control of the power transit optimized to increase the green energy produced.

The Actuating Time of an Electromagnet Excited by DC Voltage

Marius Aurel COSTEA, Bogdan Dumitru VĂRĂTICEANU, Constanţa BĂLAN

EEA 2012 | vol. 60 | nr. 1 | art. 8

An efficient iterative method is proposed for the computation of the actuation time of electromagnets. The proposed method solves the nonlinear equation of mechanical evolution using a numerical integration procedure. For various feeding curents and by varying the total weight of the mobile armature of a DC fed electromagnet, the actuation time was determined. The magnetic field was calculated with a numerical method, with a finite element software, for a convenient set of positions of the mobile armature, taking into account the nonlinear nature of the ferromagnetic material.

Design and Simulation of the Solar Street Lighting Photovoltaic System with LED Energy Lamp

Sandor Bartha

EEA 2012 | vol. 60 | nr. 2 | art. 12

This article describes the modeling and simulation of photovoltaic street lighting systems and a design concept of the power of LED lighting units proposed to use in areas with moderate solar potential. In finally is determined the contribution value of carbon dioxide emissions by replacing the traditional street lamps with LED lighting, solar lamps.

The Efficient Use of the Lighting Systems with Compact Fluorescent Lamps

Nicolae GOLOVANOV, Constantin IVANOVICI, Ionel POPA, Aurelia IONESCU, Eleonora ȚIPU, Florin STOICA

EEA 2012 | vol. 60 | nr. 2 | art. 17

The reduction of electricity losses in the household lighting are shown in this paper. There are studied the design types of lighting systems, the recommendations regarding the choice of light sources of lighting devices and means of control power consumption. As a result of surveys, it was shown that compact fluorescent lamps are one of the alternatives to the incandescent lamps that has begun to be taken out of production in accordance with EU Directives since 2009.

Technical and Economic Foundation of the Electric Vehicle Market Development

Nicolae VASILE, Floarea VASILE

EEA 2012 | vol. 60 | nr. 4 | art. 8

The electric car cumulates technical, economic and service innovation. The technical innovation refers at a lot of patents on electric energy power supply, traction electric motors and new structures of the mass distribution. Economic innovation refers at avoidance of the indisponibile or perishable fuel and raw materials. Services innovation, consisting in new methods of chipper exploitation, could represent a support for project. The paper propose a way to combine that three innovation solution to the common fezability.

Accelerated Thermal Aging Tests of Paper-Oil Insulation on Electrical Transformers and Autotransformers

Sanda-Liana COTESCU, Adrian MEREANU, Magdalena BUNEA, Cornel PREDUȚ, Carmen POPESCU, Petru NOTHINGER, Laurenţiu DUMITRAN, Gabriel TĂNĂSESCU, Florin CIOLACU

EEA 2007 | vol. 55 | nr. 1 | art. 4

Applications of the Laplace Transform to Solve the Equations of Electric Circuits with Linear or Non-Linear Elements

Valer GIURGIU

EEA 2009 | vol. 57 | nr. 2 | art. 5

Autonomous Outdoor Eco Lighting System

Dan TEODOREANU, Ioan DRÂNGĂ, Constantin IVANOVICI, Ionel POPA, Lorant Arpad KOTELEȘ, Nicolae GOLOVANOV, Mihai CHERSIN, Daniel Emilian DOBRESCU, Sidonia CRĂCIUN, Iulian TURCU

EEA 2009 | vol. 57 | nr. 2 | art. 6

Comparison Between Model and Experiment in Studying the Electric Arc

Smaranda NIȚU, Constantin NIȚU, Constantin MIHALACHE, Paula ANGHELIȚĂ, Dan PAVELESCU

Fifth Japanese-Mediterranean Workshop on Applied Electromagnetic Engineering for Magnetic, Superconducting and Nano-Materials, Larnaco, CIPRU

Electric Servomotors Quality of Design

Floarea VASILE, Mircea COVRIG

EEA 2007 | vol. 55 | nr. 1 | art. 7

Electrical Energy Saving in the Indoor Lighting by Using LEDs

Florin IONESCU, Constantin IVANOVICI, Mioara MAZILU, Ionel POPA, Mihai CHERSIN, Ioan DRANGA, Daniel Emilian DOBRESCU

EEA 2010 | vol. 58 | nr. 1 | art. 5

The general artificial lighting system represents one of the important factors which determines the society development, the labour efficiency and the health level of people, through the conditions ensured over the period without natural lighting. A constant concern on the international level is the increase of the performances of the artificial light sources, which requires studies for both the increase of the present sources parameters and the new solutions for the artificial light generation. The LED lamps, contrary to the compact luminous ones, do not imply the use of any gas, and the technology develops rapidly enough so that one can state that today it represents the best compromise between the luminous emission level and the electrical energy saving.

Electrotechnics Vs. Physics of the 20th Century

Mihai BĂDIC, Lia-Elena ACIU, Maria ȘTEFAN

EEA 2008 | vol. 56 | nr. 1+2 | art. 5

Energy Recovery of Sub-products in Dairy Industry

Nikolić VASILE, Ion BÂRSAN, Alina PĂUN

EEA 2009 | vol. 57 | nr. 1 | art. 13

High Power Vacuum Arc Investigation by Electrical and Optical Measurements

Dan PAVELESCU, Gheorghe DUMITRESCU, Smaranda NIȚU, Paula ANGHELIȚĂ

9th International Balkan Workshop on Applied Physics, 7-9 July 2008

High Power Vacuum Arc Study and Technological Applications

Dan PAVELESCU, Viorel BRAIC, Florin GHERENDI, Mariana BRAIC, C. NIȚU, M. BĂLĂCEANU, Gheorghe DUMITRESCU, Gabriela PAVELESCU, Smaranda NIȚU, Paula ANGHELIȚĂ

IV-th. International Symposyum on Advanced Topics in Electrical Engineering – ATEE 2004, 25-26 Noiembrie 2004, Bucharest, pag. 171-178, ROMANIA

Icpe – A Promoter of Propulsion Systems for Electric and Hybrid Vehicles, in Romania

Virgil RACICOVSCHI, Mihaela CHEFNEUX

EEA 2010 | vol. 58 | nr. 3 | art. 2

The urban transportation raised specific problems and caused important political, social, and environmental harms (pollution, noise, stress) in all countries during last years. The authors’ paper is among the promoters of research activities for Romanian electric vehicles. Starting with the propulsion system (electric motor + driver), Icpe developed several prototypes of electric and hybrid vehicles, aiming to win the competition for a clean transportation in Romania and offering a solution for high performances and low price electric and hybrid vehicles, to the manufacturers. The paper also presents some of the most significant projects put into practice by the Icpe team.

Integrated Intelligent Indoor Lighting Systems Using Power Luminescent Diodes

Lorant Arpad KOTELES, Constantin IVANOVICI, Ionel POPA, Viorel MARINESCU, Ionescu FLORIN, Ioan DRINGA

EEA 2008 | vol. 56 | nr. 3 | art. 11

Investigation of The Arc Evolution in a Vacuum Low Voltage Circuit Breaker

Gabriela PAVELESCU, Viorel BRAIC, Dan Pavelescu, M. BRAIC, Gheorghe DUMITRESCU, M. BĂLĂCEANU, Paula ANGHELIȚĂ

Proceeding of the XVII-th Europhysics Conference on Atomic & Molecular Physics of Ionized Gases – ESCAMPIG 2004, 1-5 Septembrie 2004, Constanța, ROMANIA

Investigation of the Rotating Arc Plasma Generated in Transverse Magnetic Field (TMF) Contacts of Vacuum Interrupter

Dan PAVELESCU, Viorel BRAIC, Florin GHERENDI, Mariana BRAIC, Constantin NIȚU, Mihai BĂLĂCEANU, Gheorghe DUMITRESCU, Gabriela PAVELESCU, Smaranda NIȚU, Paula ANGHELIȚĂ

Proc. of. International Symposium on Discharges and Electrical Insulation in Vacuum ISDEIV 2004, vol. 1, pag. 156-159, 2004

The present paper deals with the problem of the TMF interruption systems breaking capability concerning vacuum circuit breakers. The main goal is a better understanding of the physical phenomena taking place during the interruption process, for high currents, corresponding to short-circuit regime in the electrical networks. The arc appearance and its behaviour were explored with a dedicafed optical sqstem. An example of spatial and temporal distribution of the arc light intensity is presented. Specific peculiarities of the optical spectra recorded in the proximi@ of the short circuit current zero (C.Z.) moments are reported. Different current interruption situations are correlated with plasma spectral diagnosis. On this basis the authors try to define a set of plasma parameters which are critical in the studied interruption processes.

LED Lighting Systems. Energetic Efficiency

Nicolae GOLOVANOV, Virgil RACICOVSCHI, Radu PORUMB, Constantin IVANOVICI, Ionel POPA, Lorant Arpad KOTELES, Sidonia CRĂCIUN

EEA 2009 | vol. 57 | nr. 4 | art. 4

Mathematical Models and Integrated Engine Design Solutions to Ensure Rational Use of Natural and Artificial Resources

Nicolae VASILE, Mihaela CHEFNEUX, Leonard MELCESCU, Mircea RĂDULESCU, Alecsandru SIMION, Ion VONCILĂ

EEA 2007 | vol. 55 | nr. 3 | art. 10

Microwave Measurement of Cereal Humidity

Kocsis L., Schlemm U., Richter H., Mellmann J., Farkas I., Bartha S.

EEA 2007 | vol. 55 | nr. 3 | art. 12

Modeling of Switching Process in High-power Low Voltage Circuit Breakers

Smaranda NIȚU, Constantin NIȚU, Paula ANGHELIȚĂ

EEA 2009 | vol. 57 | nr. 2 | art. 1

Moving Arc Modeling in the Case of Vacuum Interrupter

Dan PAVELESCU, Smaranda NIȚU, Gabriela PAVELESCU, Paula ANGHELIȚĂ

Proc. of the 15th International Conference on Plasma Physics and Applications – CPPA 2010, 1-4 July 2010

Electrical and optical investigations are focused on a vacuum circuit breaker study. The short-circuit regime in the low-voltage network is exactly reproduced by a specific test circuit. The analysis of the phenomena during the high-current evolution and on the current-zero zone is made for the purpose of increasing the breaking capability of this kind of equipment. The displacement speed of the arc column on the surface of the contact pieces in the case of the transverse magnetic field solution is correlated with the spatial and temporal plasma diagnostic. For post-arc current being an important element defining the quality of the short-circuit interruption process, specific measurements are also performed. For better understanding of the high-current interruption in vacuum, the experimentally studied phenomena are mathematically modeled.

Moving Arc Study and Plasma Diagnosis in the Case of Vacuum Interrupter with TMF Contacts - 2

Dan PAVELESCU, Gheorghe DUMITRESCU, Gabriela PAVELESCU, Florin GHERENDI, Smaranda NIȚU, Viorel BRAIC, Paula ANGHELIȚĂ, Paula LUNGU

Proc. of. International Symposium on Discharges and Electrical Insulation in Vacuum ISDEIV 2006, vol. 1, pag. 216-219, 2006

Electrical and optical investigations are focused for a vacuum circuit breaker study. The short circuit regime in the low voltage network is exactly reproduced by a specific test circuit. The analysis of the phenomena during the high current evolution and for the current zero (c.z) zone are done in the aim of increasing the breaking capability of this kind of equipment. The displacement speed of the arc column on the surface of the contact pieces in the case of transverse magnetic field (TMF) solution is correlated with the spatial and temporal plasma diagnostic. The post-arc current being the main element defining the quality of the short circuit interruption process, specific measurements are also performed. In order to a better understanding of the high current interruption process in vacuum, the experimentally studied phenomena are mathematically modeled.

On Determining the Efficacy of Electromagnetic Shielding for Conductive/Semiconductor Materials

Mihai BĂDIC, MAria ȘTEFAN

EEA 2007 | vol. 55 | nr. 3 | art. 7

Optical Analysis of the Vacuum Arc Plasma Generated in Cup Shaped Contacts

Gabriela PAVELESCU, Dan PAVELESCU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ, Florin GHERENDI

The VI International Conference on the Balkan Physical Union, AIP Conference Proceedings, vol. 899, p. 703

Optical Emission Spectroscopy on the Vacuum Arc Plasma Generated in Low Voltage Circuit Breaker

Gabriela PAVELESCU, Dunpin HONG, Viorel BRAIC, Dan PAVELESCU, Claude FLEURIER, Mariana BRAIC, Florin GHERENDI, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ, Mihai BĂLĂCEANU

The VI International Conference on the Balkan Physical Union, AIP Conference XII-th International Conference on Plasma Physics Applications – CPPA 2003, 1-3 Septembrie 2003, Iasi, ROMANIA

Synthesis, Properties and Behavior when Subjected to Fungal Degradation of Silver Sulfadiazine-Based Polyurethane Elastomers

Ștefan OPREA, Petronela GRĂDINARIU, Bica ZORLESCU, Veronica OPREA

Proceedings of the 8th International Conference on Modification, Degradation and Stabilization of Polymers, Portorož (Slovenia) 2004

Optical Investigations on the Rotating Vacuum Arc Plasma

Gabriela PAVELESCU, M. BRAIC, F. GHERENDI, V. BRAIC, Dan PAVELESCU, M. BĂLĂCEANU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

Proceedings of the XVth Int. Conf. on Gas Discharges and their Applications – GD2004, Septembrie 2004, Toulouse, FRANŢA

Parameters that Influence the Quality and Price of Electric Servomotors

Floarea VASILE

EEA 2008 | vol. 56 | nr. 4 | art. 8

Physical Modelling and Numerical Simulation of Constricted High Current Vacuum Arc under TMF Influence

Dan PAVELESCU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ, Smaranda NIȚU

Proc. of the Conference “Cercetarea de excelenţă – premiză favorabilă pentru dezvoltarea spaţiului românesc de cercetare”, 27-29 July 2008

Post-Arc Current in Low Voltage Vacuum Circuit Breaker: Measurements and Physical Peculiarities - 2

Dan PAVELESCU, Smaranda NIȚU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

Proc. of. International Symposium on Discharges and Electrical Insulation in Vacuum ISDEIV 2002, pag. 67-70, 2004

Continuing the investigation of the post-arc (p.a.) current within low voltage switching process in vacuum, the high modulation frequency of the p.a. current was also taken into account. The constants fitted for the adopted mathematical simplified p.a. model were deduced from the experimental data, considering an equivalent scheme of the quenching chamber in vacuum formed from a capacitance and the electric discharge in a nonlinear environment.

Propulsion System Concept for a High Energy Efficient Eco-Boat

Mihaela CHEFNEUX, Viorel STANCIU, Paula ANGHELIȚĂ

Proc. of European Electric Vehicle Congress – EEVC 2011 – 26-28 October 2011

Permanent Magnet Brushless Machine for a Hybrid Electric Scooter

Paul MINCIUNESCU, Relu BALABAN, Corina MINCIUNESCU, Mihaela CHEFNEUX

Advanced Topics in Electrical Engineering (ATEE), 2011 7th International Symposium , Issue Date: 12-14 May 2011

The paper presents the design and analyze of a permanent magnet brushless machine for a hybrid electric scooter. Different combinations of slots number, magnetic poles, and concentrated windings are tested based on the speed-cycle and power-cycle of the scooter. A machine prototype has been build. The experimental data are used to validate the simulation model. A method of increasing the torque density of outer rotor machine is proposed and tested.

Electric Lighting with Compact Fluorescent Lamps

Constantin IVANOVICI, Aurelia IONESCU, Ionel POPA, Eleonora ȚIPU, Nicolae GOLOVANOV, Cristian LUNGANU, Florin STOICA

Revista “Tehnică şi Tehnologie (T&T)”, 10, 4(58)/2011, pag.80-81, ISSN 1453-8423

Rational Application of the Light Sources to the Household Lighting

Constantin IVANOVICI, Ionel POPA, Viorel IONESCU, Eleonora ȚIPU, Mihai CHERSIN

EEA 2010 | vol. 58 | nr. 1 | art. 8

This material deals with the main requirements regarding the household lighting in the kitchen , bathroom , dining rooms, bedrooms, halls etc. One takes into account the main light sources which can be used in the household lighting , taking into consideration the growing of use of the incandescence lamps of 100 W beginning with 01Sept.2009, namely the tubular luminous lamp, compact luminous lamps and, more recently, modules of LEDs with great possibilities of increasing the lifetime of the sources from 1,000 (incandescence electric lamps) to 50,000 working hours (luminescent diodes-LED), as well as the electric energy saving by 30-60 % compared to the incandescence lamps.

Analysis of the Influence of Low Power Factor, Electromagnetic Compatibility and Absorbed Power of CFL on Losses in Power Supply

Constantin IVANOVICI, Nicolae GOLOVANOV, Aurelia IONESCU, Ionel POPA, Eleonora ȚIPU, Cristian LUNGANU, Florin STOICA

Revista “Tehnica Instalaţiilor”, XI, 7(92)/2011, pag.18-21, ISSN 1582-6244

Sustainable Development: Immediate Need for Contemporary Society

Eugeniu Alexandru STERE, Ionel POPA

Simpozion „Impactul acquis-ului comunitar de mediu asupra tehnologiilor şi echipamentelor” – ACQUISTEM 2011, ICPE-Agigea, pag.12, ISBN 978-606-507-0608, editura ELECTRA, 28 – 29 iulie

Solutions Regarding Public Lighting System Modernization in Târgu Jiu

Dumitru PORUMB, Constantin IVANOVICI, Radu PORUMB, Ionel POPA, Nicolae GOLOVANOV

EEA 2011 | vol. 59 | nr. 3 | art. 6

The electric lighting is one of the electricity consumers for which light, energy, economic and aesthetic parameters must be assessed together. The reduction of lighting quality or reduction of total electricity consumption causes most often, costs more important because of indirect costs. The reduction of energy bill for lighting installations can be performed only by fully maintaining the imposed light parameters.

Some Aspects Regarding the Improvement of Ultra-High Vacuum Switching and their Application at Switchgears Manufacturing

Gheorghe ȚULUCA, Paula ANGHELIȚĂ, Florin PĂIȘ

Sesiunea de comunicări ştiinţifice Icpe, Octombrie 2000, Bucureşti, ROMANIA

Energy Production Systems for Residential Buildings from South-East Region of Romania

Paula ANGHELIȚĂ

Proc of. International Workshop – Global and Regional Environmental Protection – GLOREP 2010, vol. 2, p.58-61, 26-28 November 2010

The paper presents the results of the Eureka’s project of an international consortium based on CIVAN Advanced Technologies, Technosoft International and ICPE. The goal of the project is to design, develop, realize and test a 2D laser system machine. The product has components a new laser based on small diode lasers, intelligent servo-drives and a robotized 2D table. The linear movement on two axes is realized by ironless, bilateral linear motors with permanent magnets. The research directions of the project, components, performances and applications of the robotized table are detailed.

Structural Developments of Romanian Research in Relation to the Economic Trends of our Country's Integration into the European Space

Floarea VASILE, Nicolae VASILE

EEA 2007 | vol. 55 | nr. 2 | art. 5

Design Considerations of Permanent Magnet Brushless Generators

Paul MINCIUNESCU, Mihaela SCORȚESCU, Stelian MARINESCU

3rd International Symposium Electrical and Electronics Engineering (ISEEE), 2010

In the frame of the European Research Project RO 0054, there have been studied some aspects concerning the electric generator design. The electric generator, coupled to the Stirling engine, is the heart of the electric system of such kind of solutions for residential homes. In the paper is presented the analyze of possible solutions for the electric generator from different point of view — for example, rotative or linear- with the final target of choosing the optimum for an application. Also, there have been studied aspects regarding permanent magnet brushless generators, with conclusions for the project “Integrated micro CCHP-Stirling Engine based on renewable energy sources, for the isolated residential consumers from SouthEast region of Romania”.

Numerical Modeling of a Synchronous Machine with Permanent Magnets and Core of Composite Magnetic Material

Leonard MELCESCU, Paul MINCIUNESCU, Ciprian HAGIU, Ovidiu CRAIU, Ştefan GHEORGHE

Simpozionul de masini electrice SME’10, 7-8 Octombrie 2010

Researches Regarding the Realization of High-Class Thermal Insulation Classical Lacquer

Ionel POPA, George Dan BIDULESCU

Revista “Lucrările ICPE”, vol.9, nr.1-2/2010, pag.125-134, ISSN 1224-094X

Ecological Solutions for Power Switching Apparatus

Smaranda NIȚU, Dan PAVELESCU, Paula ANGHELIȚĂ, Magdalena LUNGU, Ștefania GAVRILIU

Proc. of the IEEE Conference EUROCON 2009, 18-23 May 2009

The fight for ecological solutions is lead in every technical field. Until 30 years ago, the challenge in the field of power switching apparatus was the interrupting currents and voltages increasing. Nowadays it is important to maintain the same technical performances but to use ecological constructive solutions. In low and medium voltage (up to 36 kV) the switching in vacuum is an ecological very good solution, but it raises technical and technological difficulties. For the low voltage contactors the replacement of the Ag-CdO contact material with Ag-SnO2 is the recommended ecological solution. The paper presents some of the authors’ results obtained in the construction of ecological low voltage interrupters and contactors.

Process Management – A Tool for Technological Changes

Floarea VASILE, M. COVRIG, C. M. GHEORGHE, S. GAMATIOS, K. KIKIS

16th Romanian International Conference On Chemistry And Chemical Engineering, September 9 – 12, 2009, Sinaia

Linear Bilateral Motor

Paul MINCIUNESCU, Stelian MARINESCU, Relu BALABAN

Simpozionul de maşini electrice SME’09, Octombrie 2009

Driving Systems: from Gearboxes to Direct Drive

Corneliu GORNIC, Paul MINCIUNESCU, Dan PRODAN

International Conference on Manufacturing Systems – ICMaS, Vol. 4, 2009, ISSN 1842-3183

Ecological System for the Street Lighting

Constantin IVANOVICI, Ionel POPA, Ion PĂUNA, Iulian TURCU, Aurelia MEGHEA, Rodica Elena CECLAN, Stergios GANATSIOS, Margarita Emilia GANATSIOU, Alina BĂDILĂ

International Symposium „The Environment and Industry” – SIMI 2009, INCD-ECOIND, Proceedings Symposium, pag.123-136, ISBN 978-606-507-039-4, editura ELECTRA, 28 – 30 octombrie 2009

Modeling Study for Forecasting of Urban Air Pollution

Irina MEGHEA, Mihaela MIHAI, Ionel POPA, Margarita Emilia GANATSIOU

International Symposium „The Environment and Industry” – SIMI 2009, INCD-ECOIND, Proceedings Symposium, pag.31-43, ISBN 978-606-507-039-4, editura ELECTRA, 28 – 30 octombrie 2009

Romanian – Portuguese Industry – Academia Partnership for Implementing Knowledge Management Systems - Essential Instruments In Increasing SMEs Economic Competitiveness

Rodica Elena CECLAN, Mihai CECLAN, Aurelia MEGHEA, Diamantino LOPES, Paulo BAPTISTA, Patricia TERCEIRO, Ionel POPA

International Symposium „The Environment and Industry” – SIMI 2009, INCD-ECOIND, Proceedings Symposium, pag.7-16, ISBN 978-606-507-039-4, editura ELECTRA, 28 – 30 octombrie 2009

The Use of Electrical Components in Public Lighting Fixtures - a New Solution for Environmental Protection

Constantin IVANOVICI, Ionel POPA, Mihai STOICA, Sidonia CRĂCIUN, Irina PETCU

Simpozionul „Impactul ACQUIS-ului comunitar de mediu asupra tehnologiilor şi echipamentelor”, ediţia a 6-a, 26-28 august 2009

High Voltage Transformer. Choosing the Nominal Voltage of the Power Supply

Paul MINCIUNESCU, Florian LAZĂR, Gabriel RÂȘNOVEANU, Bogdan Dumitru VĂRĂTICEANU

EEA 2009 | vol. 57 | nr. 3 | art. 5

The Capability and the Quality Level of the Production Processes

Floarea VASILE

ICMAS 2010, Bucuresti, 16-18 sept.2010

Sintered Electrical Contacts for High Current Interruption

Paula LUNGU, Elena ENESCU, Magdalena LUNGU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

Proc. of the XXIII-th. IEEE International Symposium on Discharges and Electrical Insulation in Vacuum – ISDEIV 2008,15 – 99 September 2008

The paper presents the experiments of elaboration copper-chromium electrical contacts, with 40-75 % copper content, manufactured by powder metallurgy techniques: infiltration with copper of a chromium frame and solid state sintering of chromium and copper powder mixture. The influence of technological parameters – powder granulometry, compacting pressure, sintering and infiltration temperature – on the physical (density, hardness) and microstructural characteristics of contacts are presented. The elaborated contacts were tested in order to determine their properties in the case of high currents interruption.

High Power Density Brushless Motors

Paul MINCIUNESCU, Stelian MARINESCU, Corina MINCIUNESCU

Second International Symposium on Electrical and Electronics Engineering – ISEEE- 2008, Galați, Romania

Romania's Accession to ERA, between Efforts and Results

Nicolae VASILE, Floarea VASILE

Masa Rorunda, de finalizare a proiectului 2 CEEX-06-8-66/2006, ICPE SA, București, 4 sept. 2008

Effective Public Lighting Systems with Metal Halide Lamps

Gheorghe GHIUR, Constantin IVANOVICI, Ionel POPA, Nicolae GOLOVANOV, Vasile HORGA

EEA 2008 | vol. 56 | nr. 1 | art. 19

Ecological Electroinsulating Varnish of High Thermal Resistance

Ionel POPA, George Dan BIDULESCU, Silvia Paula MARIN

International Conference on Ecological Materials and Technologies, ECOMAT 2008, September 25-26, 2008

Two-Wheeled Light Electric Vehicle

Mihaela SCORȚESCU, Relu BALABAN, Loren TROCAN, Gabriel RÂȘNOVEANU, Mihaela CHEFNEUX

EEA 2010 | vol. 58 | nr. 3 | art. 13

The authors of the paper present the first step done by ICPE – carrying out an electric scooter- the target of their research being an ecologic transportation system based on individual electric vehicles, supplied from photocells, adapted to the needs of a medium size community placed in a quite large area, where the metropolitan public transportation system is not available, such as the “Politehnica” campus.

Current Interruption Process in Vacuum in the Case of Low Voltage Vacuum Circuit Breakers

Dan PAVELESCU, Gheorghe DUMITRESCU, Smaranda NIȚU, Paula ANGHELIȚĂ

Proc. of the Conference “Cercetarea de excelenţă – premiză favorabilă pentru dezvoltarea spaţiului românesc de cercetare”, 24-26 October 2007

Structural Developments of Romanian Research in Relation to the Economic Trends of our Country's Integration into the European Space

Floarea VASILE, Nicolae VASILE

EEA 2007 | vol. 55 | nr. 2 | art. 5

Contribution of Romanian Companies with Foreign or Domestic Capital to the Integration of Romania into the ERA

Nicolae VASILE, Floarea VASILE

Forumul National pentru Cercetare si Inovare”, 20-21 martie 2007

Direct Drive Torque Motors FEM Modeling

Paul MINCIUNESCU, Radu CÂRNARU

EEA 2007 | vol. 55 | nr. 3 | art. 5

Stage of Acquis Communitare Transposition into National Laws Regarding Waste Management

Carmen POPESCU, Ionel POPA, Cristina CRISTEA

The First International Conference on Waste Management and Green Energy Technologies, 19 aprilie 2007

High-Speed, High-Strength Insulating Lacquer for Impregnation of Class F and H Motors

Ionel POPA, George Dan BIDULESCU, Georgeta NAGHIU, Ion PĂUNA

Simpozion 55 de ani de activitate a Grupului ICPE în dezvoltarea sectorului electrotehnic, 20-21 septembrie 2005, CCIB – Bucureşti

1,2-Disubstituted 2-Imidazolinyl Derivatives. Structure Relationship - Usage Properties

Ionel POPA, Angela LUPU, Victor PĂRĂUȘANU

Revista de Chimie, 2005

Optical Diagnostics of the Vacuum Arc Using Fast Intensified CCD - Spectrograph System

Nicolae GOLOVANOV, Radu PORUMB, Constantin IVANOVICI, Virgil RICICOVSCHI, Gabriela PAVELESCU, S. Guillot, M. BRAIC, D. HONG, Dan PAVELESCU, D. FLEURIER, V. BRAICc, F. GHERENDI, GheorgheDUMITRESCU, Paula ANGHELIȚĂ, J. M. BAUCHIRE

Proceeding of the International Society for Optical Engineering – SPIE 2004, vol 5581, pag.767-774

Studies, Analysis of Modern Methods in Urban Management and Marketing in the European Union and in the Country. Case Study on the Urban Policy Implementation Strategy for Waste Management and Environmental Monitoring in a Municipality with High Tourism Potential

Sanda COTESCU, Ionel POPA

Icpe, vol. I, decembrie 2003, Bucureşti

Conductive Polymers Based on Butadiene-Styrene Rubber

Ileana MĂDESCU, Maria-Magdalena IORDĂCHESCU, Ionel POPA

Lucrările Icpe şi CD al Sesiunii de comunicări ştiinţtifice “Materiale şi componente electrotehnice“, Icpe, 11-12 septembrie 2000, Bucureşti

Opportunity and Evaluation of the Technical Solution for the Recovery of Iodine in the Waters Associated with Oil Deposits

Mircea ȚAPU, Ionel POPA

Icpe, vol. I, noiembrie 2004, Bucureşti

Insulating Varnishes with Added Powders

Maria-Magdalena IORDĂCHESCU, Ionel POPA

Lucrările Icpe şi CD al Sesiunii de comunicări ştiinţifice “Materiale şi componente electrotehnice“, Icpe,11-12 septembrie 2000, Bucureşti

Film-Forming Compounds on the Basis of PTFE Powders

Maria-Magdalena IORDĂCHESCU, leana MĂDESCU, Ionel POPA

12th Romanian International Conference Chemistry and Chemical Engineering, UPB, 13-15 september 2001, Bucharest

Urban Management on the Implementation of European Directives on Waste and Packaging Management

Nicolae VASILE, Paul PENCIOIU, Sanda COTESCU, Ionel POPA, Carmen POPESCU

Simpozion “Impactul ACQUIS-lui comunitar privind mediul asupra tehnologiilor şi echipamentelor”, 19-20 august 2004, Agigea

Using Electronic Ballasts in Street Lighting

Nicolae GOLOVANOV, Radu PORUMB, Constantin IVANOVICI, Ionel POPA, Ecaterina FRANSUA, Doru PATULEA, Vasile HORGA

EEA 2008 | vol. 56 | nr. 3 | art. 8

Design and Modelling of a Hybrid Stepper Motor

Ioana IONICĂ, Mircea MODREANU, Alexandru MOREGA, Cristian BOBOC

The 10th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2017, Bucharest, Romania

This paper presents three-dimensional numerical modeling results for a hybrid stepper motor obtained using the finite element method, in the design stage. The design of the hybrid stepper motor for achieving a specific performance requires adequate geometrical sizing. The study provides for optimal economic and technical solutions obtained through successive improvements made in the design phase, obtained through numerical modeling, and concurring to the requirements of the product specification.

New Solutions of Linear DC Actuator with Additional Permanent Magnets: Working Principle, Design and Testing

Alexandru RADULIAN, Mihai MARICARU, Iosif Vasile NEMOIANU, Radu CREȚU

Rev. Roum. Sci. Techn.– Électrotechn. et Énerg. Vol. 62, 1, pp. 3–7, Bucharest, 2017

The paper presents the principle of a DC high-force compact actuator for operating vacuum circuit breakers. By using properly placed Ne-Fe-B permanent magnets, the actuator we propose has the following advantages: it is able to perform a large number of mechanical operation cycles (at least one million) with high frequency rate and high holding force in closed position. Through reducing air gaps and leakage fluxes and the introduction of permanent magnets in the magnetic circuit, the proposed technical solution ensures low power consumption, compactness, reliability and reduced manufacturing cost. Such a linear actuator proves to be versatile finding application in operating valves remotely, robotic systems, packaging machines, electric switchgears, medical equipment, production machinery etc. Least but not last, it may find application in transportation industry ranging from rail to aircraft equipment. The working principle of the actuator is presented, followed by preliminary calculations and finite element simulations (static and dynamic) in FEMM package, incorporating specially designed LUA scripts. Finally, measurements performed on an actuator prototype are presented and discussed.

A Critical Approach of Thinking Risk-based in the New Issue of ISO 9001:2015 Standard

Floarea VASILE

EEA 2017 | vol. 65 | nr. 1 | art. 3

After decades during which “quality” has been thought of as preventing “non-quality”, the new edition of the ISO 9001:2015 standard brings a new concept, defined as “risk-based thinking”. Risk is defined as the effect of uncertainty in relation to the expected results. When talking about risk, the 2015 edition of the ISO 9001 standard defines it in relation to uncertainty within the organization which is required to plan and implement actions to deal with risks and opportunities”. Is it recognized that “risk-based thinking” is a requirement to “reduce prescriptive requirements” and replace them with performance-based requirements. It is required that management at the highest level drives the planning activities for avoiding or mitigating the negative effects of risks, which means having a proactive and beneficial attitude for the organization.

Environment: primordial condition for a sustainable future (Part 2)

Eugeniu Alexandru STERE, Ionel POPA

EEA 2016 | vol. 64 | nr. 1 | art. 19

Numerical Studies for Special Electric Machines, DC Limited Angle Torque Type of Motors

Ioana IONICĂ, Mircea MODREANU, Alexandru MOREGA, Cristian BOBOC

EEA 2016 | vol. 64 | nr. 3 | art. 2

This paper is concerned with properly sizing all parts of a DC Limited Angle Torque Motor aiming to obtain higher electromagnetic torque and higher uniformity degree of the torque-angle characteristic for the operating range. The magnetic field analysis conducted using the finite element method allowed for successive improvements that led to satisfying the design requirements. The usage of numerical models requires less prototyping through experimental models, which result in shorter design cycle and reduced fabrication costs.

The Antagonistic Relationships Between Development and Environment: the Promoter of the Sustainable Development

Ionel POPA, Eugeniu Alexandru STERE

Sesiunea ştiinţifică de primăvară a Academiei Oamenilor de Ştiinţă din România “Cooperarea între mediul academic şi cel economic pentru o dezvoltare economică durabilă“, Bucureşti şi Mioveni, 26 – 28 mai, 2016

Synthesis and Properties of the Polyurethane Urea with Pyridine-2,6-Dicarboxamide in their Structure

Ștefan OPREA, Violeta Otilia POTOLINCĂ, Aurelian STANCIU, Bica ZORLESCU, Veronica OPREA

Proceedings of the 9th International Conference on Modification, Degradation and Stabilization of Polymers (MoDeSt 2016), Cracow (Poland)

Complete Solutions to Achieve Electric Propulsion for Light Vehicles

M.G. NEACȘU, V.S. STANCIU , G.V. RÂȘNOVEANU, S.S. MATEI, C. NICOLESCU

13th WEC Central & Eastern Europe Regional Energy Forum – FOREN-2016

Autonomous Power System for Supplying Electric Vehicles Using Renewable Energy Sources

Lucian Nicolae DEMETER, Bogdan-Alexandru ONOSE, Viorel URSU

WEC CENTRAL & EASTERN EUROPE REGIONAL ENERGY FORUM – FOREN 2016, 12-16 June 2016, Vox Maris Grand Resort, Costinesti, Romania

This paper presents a study on the performances of an autonomous power system based on renewable energy sources usage, a system designed to equip trailers or car platforms. The electromechanical system was developed by Icpe within “SIMOPEL” project, a large project from the electric mobility field. Icpe through this project imposed itself as a major objective to become a systems, components and services manufacturer in the field of mobility based on electric propelled vehicles.

Mass Optimization of Wind Generators

Nicolae VASILE, Floarea VASILE, Ramona CHIRESCU, N. FIDEL

Conferința Națională de Surse Noi și Regenerabile de Energie Ediția a XVI-a, Târgoviște, 22-23 Octombrie 2016

Photovoltaic Charging Station Developed for Land Vehicles and Boats

Lucian Nicolae DEMETER, Alexandra Ionela VINTILĂ, Viorel URSU

EEA 2015 | vol. 63 | nr. 4 | art. 3

This paper presents the design and analysis of a photovoltaic off-grid power system, an electromechanical structure having the role of an electric charging station within the electro-mobility area. A photovoltaic charging station developed for land vehicles and boats based on electro-mobility, namely a modular electric propulsion system, made in flexible technologies for equipping land electric vehicles or electric boats.

Design and Validation of an 2.5 kW Naval Propulsion System with Rim Driven Propeller

Bogdan Dumitru VĂRĂTICEANU, Paul MINCIUNESCU, Constantin NICOLESCU, Silviu MATEI, Mihai NEACȘU

Electric Vehicle Conference and Show 2015 – EV 2015

Numerical Studies on DC, Limited Angle, Torque Motors - 2

Ioana IONICĂ, Mircea MODREANU, Alexandru MOREGA, Cristian BOBOC

SIMPOZIONUL DE MAŞINI ELECTRICE SME’15, 2015

Special Electric Cables: Setting Production and Preliminary Analysis of Costs

Bica ZORLESCU, Ion BÂRSAN

EEA 2015 | vol. 63 | nr. 4 | art. 8

This paper aims to emphasize the importance of the preliminary analysis and the economic effects within managerial decisions and the cost of operation, so that the account information to be used efficiently. The inventory accounting contributes to the planning, budgeting and managing of the enterprise economic resources. To manage the resources and the costs means not only to try to reduce their value, but also to maintain the balance between the expenditure and the utility generated by this. That means to take good decisions in all domains, which have influences over the enterprise’s resources and costs. The result of the enterprise express its own exploiting elements – the owned resources – the capability of the enterprise to produce by its own activity – namely what is capable to produce – and all the quality dimensions of its own production capacity – how it produces and for whom. Keeping the potential of the enterprise’s activity depends on the way it succeed in recovering, by selling, the costs resulted from the manufacturing activity and the development is conditioned by the difference between the amounts obtained from selling the goods, execution of works or services and the expenditures related to these activities.

Photovoltaic Charging Station Developed for Land Vehicles and Boats

Lucian Nicolae DEMETER, Alexandra Ionela VINTILĂ, Viorel URSU

EEA 2015 | vol. 63 | nr. 4 | art. 3

Modern Commutation Equipments Researched and Developped at Icpe - Industrial Applications

Alexandru RADULIAN, Nicolae MOCIOI, Ionuț DEACONU

MESAGERUL ENERGETIC, ISSN: 2066 – 4974, ANUL XIV, NR. 159, februarie 2015

Chopping Current Phenomena for Various Contact Materials

Alexandru RADULIAN, Nicolae MOCIOI, Ionut DEACONU

EEA 2015 | vol. 63 | nr. 4 | art. 2

The vacuum arc is an electric discharge in metal vapours produced by electric contacts after disconnecting of an AC inductive load. When a current of tens of amperes is disconnected, the vacuum arc has a low energy (diffuse arc) and it cannot longer sustain itself, therefore the current suddenly “chop” to zero. If the value of chopping current is high enough, this fast variation of the current along with circuit impedance can produce over-voltages. In this paper, experiments made on the different contact materials in order to reduce de value of the chopping current, are reported. The chopping current measurements were carried out with a demountable vacuum chamber in a synthetic test circuit that can produces a current pulse with an amplitude up to 100A.

The Need for Continuous Professional Training in the Field of Electricity Generation from Renewable Sources

Floarea VASILE

Conferința Națională de Surse Noi și Regenerabile de Energie Ediția a XV-a, Târgoviște, 29-30 Octombrie 2015

Importance of Know-How Transfer: The New Multi-Actor Network New S.O.L.A.R.

Floarea VASILE, D. ARSENE

Conferința de închidere a proiectului POSDRU: Noi standarde ocupaționale pentru o economie orientată spre o dezvoltare durabilă și economisirea resurselor energetice – NEW S.O.L.A.R, București 11 decembrie 2015

Design of Permanent Magnet Assisted Synchronous Reluctance Motor for Light Urban Electric Vehicle

Bogdan VĂRĂTICEANU, Paul MINCIUNESCU, Silviu MATEI

International Symposium on Fundamentals of Electrical Engineering 2014 – ISFEE 2014

Launch of the Sustainable Development Program

Eugeniu Alexandru STERE, Ionel POPA

EEA 2014 | vol. 62 | nr. 4 | art. 14

The paper describes the activities which preceded the „Earth Summit” held at Rio in 1992 and the documents analysed and voted by the leaders of the States and delegates. It was presented too the content of the sustainable development programme, named Agenda 21, Rio Declaration regarding the rights and the obligations of the States and the Declaration ofn the biological diversity (biodiversity). There weree, finally, mentioned some intersting data which can stimulate the sustainable development achievement and also data which can delay this achievement. No wonder that every five years further was necessary to be organized other Summits and working teams or committees.

Performance Evaluation of Compact Fluorescent Lamps Equipped with Electronic Ballast Based on Specialized Integrated circuits

Constantin IVANPVICI, Ionel POPA, Nicolae GOLOVANOV, Eleonora ȚIPU

The 8th International Symposium on Adevanced Topics in Electrical Engineering – ATEE-2013

Business Model for Innovation Development (III), SR 13547: 2012 - Part 1: Innovation Management

Ionel POPA, Miorița UNGUREANU

Revista „Tehnică şi Tehnologie”, 68, nr.2/2013, pag.92-93, ISSN 1453 8423

Development of W-Cu-Ni Electrical Contact Materials with Enhanced Mechanical Properties by Spark Plasma Sintering Process

Magdalena LUNGU, Violeta TSAKIRIS, Elena ENESCU, Delia PĂTROI, Virgil MARINESCU, Dorinel TĂLPEANU, Dan PAVELESCU, Gheorghe DUMITRESCU, Alexandru RADULIAN

Acta Physica Polonica A, Vol 125 (2014), No. 2, p. 327-330, ISSN: [e]1898-794X ; [p]0587-4246

This study reports on the development of some W-Cu-Ni materials for use as electrical contacts for low voltage vacuum switching contactors for nominal currents up to 630 A. The contact materials with 85 wt% W, 12-14 wt% Cu and 1-3 wt% Ni were obtained by spark plasma sintering process in vacuum. From very nely dispersed W-Cu-Ni powder mixtures there were produced sintered electrical contact pieces that were investigated in terms of physical, microstructural, mechanical, and functional properties. The material sintered at 1200 0C exhibited a near fully dense structure with very low porosity and enhanced mechanical properties: hardness of maximum 480 HV1 and elastic modulus of maximum 220 GPa and low chopping current of maximum 1.77 A.

Nanostructured W-Cu Electrical Contact Materials Processed by Hot Isostatic Pressing

Violeta TSAKIRIS, Magdalena LUNGU, Elena ENESCU, Dan PAVELESCU, Gheorghe DUMITRESCU, Alexandru RADULIAN, Nicolae MOCIOI

Proc. of. International Symposium on Discharges and Electrical Insulation in Vacuum Acta Physica Polonica A, Vol 125 (2014), No. 2, p. 348-352, ISSN: [e]1898-794X ; [p]0587-4246

Nanostructured W-Cu-Ni electrical contact materials to be used in low voltage vacuum switching contactors for nominal currents up to 630 A were developed successfully by hot isostatic pressing. W-Cu-Ni composite powder mixtures with copper content of 20 to 40 wt% and 1 wt% Ni were mechanically alloyed in Ar atmosphere by high -energy ball milling with a ratio of milling steel balls: powders mixtures of 8:1 and rotation speed of 400 rpm for 10 and 20 h. The effect of mechanical alloying on the sintering response of composite compacts was investigated. Also, the sintered contacts were characterized from the point of view of physical, microstructural, mechanical, and functional properties. The nanostructured electrical contacts presented very good sinterability and homogeneous structures with a maximum compactity degree of about 89%. The best W-Cu-Ni compositions with relative density of about 80%, chopping currents lower than 5 A, copper content lower than 40% as W-20Cu-1Ni (10 h of mechanical alloying and 20 h of mechanical alloying) and W-30%Cu-Ni (10 h of mechanical alloying) were selected to be used in vacuum contactors.

Some Aspects about Indoor Environmental Quality

Paula ANGHELIȚĂ

EEA 2015 | vol. 63 | nr. 4 | art. 11

At present, the requirement of obtaining a healthy and comfortable indoor environment becomes of great importance. During the past decade, the Indoor Environmental Quality (IEQ) issue was analysed both from the perspective of its impact on occupants (people spending up to 90 % of their time in indoor environment where level of pollutants are reported two to five times higher than outside), and from perspective of sustainable buildings creation. Lowering the indoor levels of pollutants and their effects represent an important target and a priority both in new buildings design and in rehabilitation process of old buildings. The use of materials and products with low-polluting emissions during rehabilitation successfully contribute to this goal. To create an energy efficient and exceptional living environment, different specific factors, that depends on occupants requirements, the existent constructive solutions, as well as restrictions imposed by standards, have to be balanced against each other in order to fuse health, comfort, and environmental aspects. In this paper, it will be presented the peculiarities about the evaluation process of the Indoor Environmental Quality, in order to obtain both valuable information on users’ perception of the buildings before and after rehabilitation process, and a better understanding of what is most important in the building environment to focus on.

Numeric Modeling of a Two-Channel Limited Angle Torque Motor

Mircea MODREANU, Mihail-Iulian ANDREI

EEA 2014 | vol. 62 | nr. 1 | art. 3

The paper presents the electromagnetic modeling methodologies of a two-channel limited angle torque motor. There are presented two types of numeric models: two 2D models created by using specialized software for the numeric field analysis COMSOL Multiphysics and FEMM and one 3D model created with COMSOL Multiphysics. First, the numeric results for the 2D models will be compared. In the second part, the benefits of the 3D model will be highlighted. Finally, the numeric results of all models will be validated by comparison with the data obtained in the experimental way.

Compact Fluorescent Lamps: a Viable Solution Even Now

Constantin IVANOVICI, Ionel POPA, Gheorghe GHIUR, Viorel IONESCU

EEA 2014 | vol. 62 | nr. 1 | art. 11

New types of compact fluorescent lamps of power from 32 W to 105 W with improved performances in terms of: efficiency (η), power factor (λ), total harmonic distortion of the current (THDI) and the absorbed power (Pabs) were performed by specialists of Icpe. New types of electronic ballasts, composed of specialized integrated circuits depending on the nominal power, were designed and manufactured.

2D Robotized Table for Laser Systems

Paul MINCIUNESCU, Florian LAZĂR, Gabriel RÂȘNOVEANU, Bogdan Dumitru VĂRĂTICEANU

EEA 2014 | vol. 62 | nr. 2 | art. 2

Substantiation of the Sustainable Development Concept

Alexandru Eugeniu STERE, Ionel POPA, Sanda Liana COTESCU

EEA 2014 | vol. 62 | nr. 2 | art. 16

The paper presents the actions deployed by the United Nations during the eights decade of the last century, that were marked by the activities of the first Independent Commissions, Commissions presided by Willy Brandt (1977-1980), Olof Palme (1980-1982) and Mrs Gro Harlem Brundtland (1984-1987). The reports of the first two Commission („North-South: A Program for Survival” from 1980, and „The Common Security: A Blue-print for Survival” from 1982) were very useful for the „World Commission on Environment and Development”, known as „Brundtland Commission” too. The Report „Our Common Future” presented in 1987, the Commission founded the concept of the sustainable development. The new concept made a normal link between environment and development, including the other main factors concerning the life and humanity survival (peace and security, population and human resources, food, protection of species and ecosystems, management of oceans and space, industry, economy, energy, institutional and legal bases, etc.).

A New Concept of Electric Vehicle Charging Station

Bogdan Dumitru VĂRĂTICEANU, Nicolae MOCIOI, Constantin NICOLESCU

EEA 2014 | vol. 62 | nr. 3 | art. 2

This paper presents the Icpe research project regarding design and development of a Level 2 charging station for electric vehicle. The new concept proposes that the charging station should be supplied entirely from renewable energy sources. The research project also includes a study of electric vehicle charging modes.

Mechanical Design and Analysis of a Permanent Magnet Rotors Used in High-Speed Synchronous Motor

Bogdan Dumitru VĂRĂTICEANU, Paul MINCIUNESCU, Daniel FODOREAN

EEA 2014 | vol. 62 | nr. 1 | art. 1

In high-speed machines, the rotor mechanical design often become more critical that the electromagnetic or thermal design. The main focus is to find out and reduce the mechanical stress distribution in the rotor’s component parts. For preliminary mechanical design, the analytical approach is used. Further design and optimization implies 2D finite element analysis. In this paper, two types of permanent magnet rotors (with surface-mounted magnets and with buried magnets) are modeled and analyzed.

Thermoelectric Generator Pulse Operated

Marin NEDELCU, Marian APOSTOL, Viorel Şerban STANCIU, Ion BÂRSAN

EEA 2014 | vol. 62 | nr. 1 | art. 5

A new type of thermoelectric transport is described, consisting of pulses of charge carriers, which “fly” periodically through the external circuit from the hot end of the sample to the cold end, with a determined duration of the “on” and “off” times of the electric contacts, while maintaining continuously the thermal contacts. It is shown that such a non-equilibrium ideal thermal “machine” works cyclically with an improved efficiency compared with efficiency of the thermoelectric devices operated in an equilibrium transport regime, but the electric flow and power are increased, as a consequence of concentrating the charge carriers on pulses of small spatial extent. The machine is reversible, in the sense that it can operate either as a thermoelectric generator or as an electro-thermal cooler. So, it is described a new thermoelectric generator special designing to fulfill the needs of pulse operating and a set up able to measure the thermoelectric parameters of Non Steady-State (pulse) operated generators. Preliminary measurements show a minimum two times increasing of delivered electric power, using same heat power input, when we are working in pulse operation. It is confirmed existence of a lower limit of frequency where the electric power starts to increase comparing with DC operation and a superior limit of frequency, where the increasing is too low to be taken into consideration. All these results are a strong confirmation of “pulsed thermoelectricity” theory.

Influence of Z-2p Combination on the PMSM Performances

Tiberiu TUDORACHE, Bogdan Daniel DUMITRU, Mircea MODREANU

EEA 2013 | vol. 61 | nr. 1 | art. 3

This paper deals with the numerical analysis of a series of Permanent Magnet Synchronous Machines (PMSM) with the purpose to identify favourable combinations of the number of slots Z and number of poles 2p that lead to reduced values of Cogging Torque (CT) and Unbalanced Radial Forces (URF). The numerical analysis is carried out on PMSMs with 10, 12 and 14 poles and with a variable number of slots between 12 and 45. This study uses the field computation software package FLUX based on Finite Element Method (FEM), followed by analytical calculations for the estimation of URF.

A New High-Tech Brushless Motor/Generator with Axially Aligned Stator Poles

Paul MINCIUNESCU, Bogdan Dumitru VĂRĂTICEANU, Stelian MARINESCU

EEA 2013 | vol. 61 | nr. 2 | art. 4

The paper presents a high-tech permanent magnets brushless machine with double-radial air gap, double rotor and axially aligned stator poles. The stator windings are physical separated from each other in order to encourage airflow around the conductors for a better effective cooling. Numerical modeling analysis is used to predict the new machine performances. The new configuration provides some advantages in comparison with a standard construction: higher efficiency, lower permanent magnet weight, efficient cooling system, lower inertia, suited for fault tolerant machine.

Power Quality Analysis Report

Cornel JIVAN, Mihai HANEK

EEA 2013 | vol. 61 | nr. 3 | art. 5

The paper presents an analysis of the power quality in a trader with special technological equipment that requires continuous power. We found very high levels of capacitance energy injected in the electric network, confirmed also by the electric energy bills. After the recorded tests and measurements, we found the generating sources, namely the three power supplies UPS, each of 250 kVA capacity. To remedy this problem, we proposed a number of measures including the installation of a passive filter (inductive) to compensate the capacitive load.

Numerical Modelling of an Electromagnetic Actuator for Vacuum Contactors

Alexandru RADULIAN, Nicolae MOCIOI

2014 International Conference and Exposition on Electrical and Power Engineering (EPE), p. 204 – 209, Publisher : IEEE, DOI:10.1109/ICEPE.2014.6969898, Electronic ISBN: 978-1-4799-5849-8

In this paper, the authors aim to present the modelling, simulation and experimentation of an electromagnetic actuator used in the construction of vacuum contactors. In order to validate the numerical results obtained by computer simulation was performed and an experimental model. The role of the electromagnetic actuator is to achieve movement of the movable electrical contacts of the contactor with certain speeds and precise trajectories. The advantages of the electromagnetic actuator presented in this paper are the following: it is able to perform a large number of mechanical cycles (at least than one million), with high frequency, with high holding force in the closed position, through reducing air gaps and technology leakage flux, low power consumption, enrolling in a compact volume, reliable and low cost manufacturing. Using finite element simulation software, it was modelated and optimized an electromagnetic actuator with high performance, reliable, inexpensive that can be easily used in the construction of the Vacuum Contactors.

The New Building Energy Management System of the Icpe Office Building

Bogdan ONOSE, Cristian BOBOC, Mihaela CHEFNEUX

EEA 2015 | vol. 63 | nr. 4 | art. 5

This paper presents the improvements made to the ICPE Office Building. The concept, which lies behind the new building energy management system (BEMS), is based on extending the existing capabilities in terms of connections and inputs to the system and increase the number of sensors and meters in order to improve the overall data quality, by managing to isolate small areas from the building. The information presented is based on all energetic fluids found in ICPE Office Building, like heating agent, cooling agent, electric current and domestic water. A depth analysis of the building systems operating mode was made and based on that an adequate strategy that was developed in order to monitor and control all the important aspects of the building.

Results Obtained by the Romanian Partners for the Frame of FP5 European Project - ELMAS - Hybrid Vehicles

Răzvan MĂGUREANU, Mihaela SCORȚESCU, Crişan DAVIDESCU

EEA 2012 | vol. 60 | nr. 4 | art. 10

As a partner in ELMAS – “ENK6-CT1999-00017 – New High Efficiency Electric Machines Solutions for Mild Hybrid Applications”, POLITEHNICA University of Bucharest and also ICPE SA and Electrotehnica SA acting as subcontractors were involved in the research of new technical solutions to be used in development of a hybrid vehicle. The project was coordinated by Centro Ricerche Fiat (Italia) Other partners were: University of Sheffield (UK), Politecnico di Torino (Italia), Volvo Technology (Sweden), Aachen University Of Technology (Germany) Switched Reluctance Drives LTD (UK). The Romanian partners were in charge of: design and manufacture of the permanent magnet synchronous motor, design and manufacture of power inverter, control of the motor and inverter through a CAN bus. In this article will be presented the results obtained by romanian partners.

Hybrid propulsion conceptual model for watercraft - Eco-Boat

Viorel STANCIU, Mihaela CHEFNEUX, Paula ANGHELIȚĂ, Bogdan VĂRĂTICEANU

Vol. 60 | nr. 4 | October – December 2012 Article 11
EEA 2012 | vol. 60 | nr. 4 | art. 11

Based on economic reasoning, there is limited access for watercraft in protected areas. The pollution produced by traditional propulsion systems represents the primary reason for these limitations. The hybrid propulsion system from eco-friendly watercraft developed by the ECO-Boat project will be able to improve the performance related to efficiency and pollution of watercraft that require small or medium power. The propulsion system is designed to be adapted to new or retrofitted watercraft based on a thermal propulsion system and using available modules on the market. The electrical engine coupled with the internal combustion engine will be scaled to give the maximum power required for watercraft propulsion, while the power management system will be designed to meet the electrical power requirements of the watercraft. Through it’s eco-friendly propulsion system, Eco-boat will represent an amazing opportunity to visit fragile, pure and protected ecosystems, usually prohibited for motorized watercrafts while preserving their unique integrity and biodiversity.

Tubular Lamps with LEDs Modules for Indoor Lighting

Constantin IVANOVICI, Eleonora ȚIPU, Florin IONESCU, Ionel POPA, Viorel IONESCU, Lorant KOTELES

EEA 2011 | vol. 59 | nr. 1 | art. 8

At present, in indoor lighting, the lighting system with lamps with LEDs is in incipient study for commercialization, but even now this system is a viable substitute and tis probable that in the future it will constitute an alternative for the entire range of lamps.This article presents the aspects related to the study and performance of 3 variants of tubular lamps for indoor lighiting with LEDs for 600mm, 1200mm, and 1500mm, that are equivalent to the tubular fluorescent lamps of 18 W, 36 W and 58 W which they can replace in the existing luminaires. Using the lighting sources with LEDs will achieve an important electrical energy saving for indoor lighting, an lifetime of the lighting source of over 20 years, protecting the environment.

30 Years of Photovoltaics in Romania: the ICPE-NESL Experience

Dan Ilie TEODOREANU, Maria TEODOREANU, Ştefan ȘONTEA

EEA 2011 | vol. 59 | nr. 2 | art. 9

The paper presents the main achievements of the New Energy Sources Laboratory of ICPE in the field of photovoltaics and the main research activities of the centre within national and international collaborations. Founded in February 1981, NESL became an important group performing R&D activities in the field of photovoltaics (PV) and other renewable energy sources.

Evaluation of Vacuum Contactor Testing Facility by Optical and Spectroscopic Investigations

Cătălin VITELARU, Alexandru RADULIAN, Nicolae MOCIOI, Viorel BRAIC

32nd ICPIG, 26-31 Julie, 2015, Iași, Romania

Optical Emission Spectroscopy and fast imaging were performed in a testing facility designed to measure electrical characteristics of vacuum contactors. The emission spectra are used to identify the dominant species in the discharge volume between electrodes, depending on the current regime. The fast imaging offers a global view on the temporal and spatial evolution of the arcs developing between the two electrodes. Moreover the mechanical movement of the mobile electrode is quantified and analysed, in relation with the electrical measurements.

Effect of the Hard Segment Structure on Properties of Resorcinol Derivatives-Based Polyurethane Elastomers

Oprea S., Joga A., Zorlescu B., Oprea V.

Revista High Performance Polymers, vol. 1-8

Two series of polyurethane elastomers were obtained from poly(1,4-butylene adipate) diol and 1,6-diisocyanatohexane, which were then chain extended with resorcinol derivatives such as benzene-1,3-diol, 2,4-dihydroxybenzaldehyde, or 1-(2,4-dihydroxyphenyl) hexan-1-one. This article investigates the effects induced in polyurethane elastomer properties by varying the hard segment composition through changing the amount of aliphatic diisocyanate and through the influence of the chemical structure of the resorcinol derivatives’ chain extenders. The different chemical composition and the presence of different dangling chains on the chain extender structure influenced hard segment cohesion, resulting in important effects on the polyurethane elastomer properties.

Magnetic Field Models for a DC Torque Motor

Ioana IONICĂ, Mircea MODREANU, Alexandru MOREGA, Cristian BOBOC

Buletinul Institutului Politehnic din Iași, Secția Electrotehnică, Energetică și Electronică, Fasc. 4, Tomul LXI (LXV), pp. 53-60, Editura Politehnium, 2015, ISSN: 1223-8139

This paper aims to present and analyse magnetic field models for a DC Torque Motor, by using an electromagnetic field analysis program, which is based on the finite element method that facilitates the accurate evaluation of several configurations, reducing thus the need for experimental models.

Analysis of a Naval Propulsion System with the Electric Motor Mounted in the Propeller Sheath

Stelian MARINESCU, Paul MINCIUNESCU

EEA 2010 | vol. 58 | nr. 3 | art. 11

The paper deals with a naval propulsion system in which the propeller is directly driven, on the periphery, by an electric motor. This configuration enables an increase of the propulsion efficiency. The motor used is synchronous, with permanent magnets, free of slots. The construction and the experimental results are also presented.

Arc Voltage Analysis for Vacuum State Estimation in Vacuum Interrupters

Paula ANGHELIȚĂ, R. W. P. KERKENAAR, W. F. H. MERCK

Proc. of. International Symposium on Discharges and Electrical Insulation in Vacuum ISDEIV 2002, pag. 443-446, 2002

In this paper the arc voltage of a vacuum interrupter, switching a 10 A DC current, is evaluated. Voltage peaks are counted during 6 ms and represented in histograms. These histograms are unambiguously discriminative for pressures above 3*10/sup -2/ Pa. Beyond this pressure a sharp change in the performance of the arc voltage is visible.

The Technical and Economic Foundation of the Electric Car Market Development

Nicolae VASILE, Floarea VASILE

Simpozionul Automobilul electric, octombrie 2012

Autonomous Outdoor Lighting System

Constantin IVANOVICI, Ioan DRANGA, Ionel Popa, Lorant Arpad KOTELES, Mioara MAZILU, Nicolae GOLOVANOV

EEA 2008 | vol. 56 | nr. 4 | art. 13

Eco-Friendly Fireproofing Polymeric Materials

Lidia AVĂDANEI, Sanda COTESCU, Cornel PREDUȚ, Magda BUNEA, Aurelia IONESCU , Marius JITIAN, Rodica ION, Horia IOVU, Petru NOTINGHER, Mihail CONSTANTINESCU

EEA 2007 | vol. 55 | nr.3+ 4 | art. 15

Compatibility of Insulating Materials in Insulation Systems

Elena ROTAR, Aurora JOGA, Liliana PUȘCAȘ

EEA 2008 | vol. 56 | nr. 3 | art. 10

The article presents an original process used to select the components of an insulation system. The results obtained as a result of applying the compatibility test for the insulating materials are presented in parallel with the results obtained in the case of testing of complete insulation systems in accordance with the standardized methodology.

Conception of Power Production/Distribution to Power Isolated Residential Consumers

Paula ANGHELIȚĂ, Mihaela CHEFNEUX, Mihaela SCORȚESCU, Loren TROCAN, Relu BALABAN

EEA 2010 | vol. 58 | nr. 2 | art. 3

Within the European Research Project RO 0054 (Integrated micro CCHP-Stirling Engine based on renewable energy sources, for the isolated residential consumers from South-East region of Romania (m-CCHP-SE)), some aspects regarding the conception of power production /distribuition systems were investigated aiming to develop the power independence of residential buildings, and having a low impact on the environment. The main objective of the project consist on the mCCHP-SE (micro Combined Cooing Heat and Power – with Stirling Engine) system development of the insolated regions, of the regions in country and towns placed on the edge, like a durable

Correlation of Results of Accelerated Aging Tests with the Results Obtained under Normal Conditions of Use

Bunea MAGDALENA

EEA 2007 | vol. 55 | nr. 3+ 4 | art. 14

D&D Black® (Patented and Produced in Romania) VS Nylon Multifilaent Braided

Daniel COCHIOR, Silviu CONSTANTINOIU, Dumitru PEȚA, Paul PENCIOIU, Dan Cusătură CRĂCIUN, Dan Gabriel COSTEA

EEA 2010 | vol. 58 | nr. 1 | art. 10

The paper refers to no absorbable monofilament suture material, known as D&D Black®, the only one made in Romania, after 6 years of hard works. The product has been made as result of collaboration between Surgical Clinics of CF2 and St. Maria Hospital, ICPE – Bucharest (physical and chemical testing) and ICCF – Bucharest (laboratory in vivo testing). Certainly, the idea is not original in medicine, but at a national level can solve few medical and economical problems and seems to by a real advantage to use these threads. This clinical and laboratory study analyzes the use of D&D Black®, no absorbable monofilament suture material versus nylon multifilament suture threads, a suture threads which is still used in Romania despite the fact that it has no medicalaccepted by Health Department of the Government.

Diagnosis and Materials for Electrical Engineering

Dan PAVELESCU, GheorgheDUMITRESCU, Paula ANGHELIȚĂ, Smaranda NIȚU

International Conference on Materials and Electrical Engineering, 16-19 June 2008

Electric Arc Model, for High Power Interrupters

Smaranda NIȚU, Constantin NIȚU, Paula ANGHELIȚĂ

The International Conference on “Computer as a Tool”, EUROCON 2005, vol. 2, pag. 1442-1445

The switching tests, to which are subjected the interrupters, consume a large amount of power and materials. The ante-calculation of the arc voltage or the post-arc current is practically impossible to be analytically achieved. A solution is the switching process modeling, by taking into account the apparatus characteristics, such as dissipated power and the time constants. Within the framework of this paper, a model of the switching phenomena in an AC low voltage vacuum circuit breaker is presented, aiming to better predict the apparatus behaviour. The model is based on a very attentive experimental investigation of the switching processes taking place at high currents interruption. Based on the experimental investigations results, statistically processed, the parameters of the electric arc model, from the Mayr’s equation can be calculated. Finally, the arc voltage, the post-arc current and the transient recovery voltage, which represent the circuit breaker stresses in the switching process, are calculated. The obtained results are validated by comparison with the experimental ones and they can be used to predict the behaviour of other similar circuit breaker of new type or to optimise an existing apparatus.

Energy Storage Systems for Buildings Equipped with Photovoltaic Cells

Paula ANGHELIȚĂ, Mihaela CHEFNEUX, Relu BALABAN, Loren TROCAN

Proc. of the 3rd IEEE International Symposium on Electrical and Electronics Engineering – ISEEE 2010, 16-18 September 2010

Evaluation of the Research Structure in Romania in Relation to Trends in the European Research Area - ERA

Floarea VASILE, Nicolae VASILE

EEA 2007 | vol. 55 | nr. nr.3+ 4 | art. 13

High-Current Vacuum Arcs on Magnetic Field Contacts: Electrical, Spectroscopic and Contact Temperature Investigations

Dan PAVELESCU, Viorel BRAIC, Gheorghe DUMITRESCU, Florin GHERENDI, Mariana BRAIC, Gabriela PAVELESCU, Paula ANGHELIȚĂ, Maria ȘTEFAN

Proc. of. International Symposium on Discharges and Electrical Insulation in Vacuum ISDEIV 2002, pag. 170-173, 2002

The paper deals with the electric arc phenomena in a low voltage circuit breaker in order to improve the breaking capability. Electrical and thermal parameters were measured in the high current arc period and in the zero current moment (CZ) and corroborated with the arc plasma spectroscopic investigations. Considerations concerning successful or unsuccessful high current interruption are presented. The paper presents results based on single shot time resolved emission spectroscopy around the CZ.

Innovative Europe Through the Era and Actions of Romania for Alignment with the Common European Effort in the Field

Nicolae VASILE, Floarea VASILE

EEA 2008 | vol. 56 | nr. 4 | art. 14

Interruption de L’arc Electrique en Vide dans les Disjoncteurs B.T. Utilisant le Champ Magnetique Axial

Dan PAVELESCU, Gheorghe DUMITRESCU, Smaranda NIȚU, Gabriela PAVELESCU, Paula ANGHELIȚĂ

Proc.1-er Conference sur l’arc electrique (CAE-2005), pag.28-35, Orleans, FRANŢA

Lamps of Metal Halides and Electronic Ballasts Used for the Public Lighting

Gheorghe GHIUR, Radu PORUMB, Constantin IVANOVICI, Ionel POPA, Daniel Emilian DOBRESCU, Ion VĂCĂRESCU

EEA 2010 | vol. 58 | nr. 2 | art. 9

Development of a good quality public lighting represents a requirement, both social and economic, by adopting the best technical solutions for the increase of the lighting installations power efficiency. The recommended lighting level is established based on some technical-economic studies by comparing the lighting installation cost and the indirect losses due to the social costs, accidents and aggressions in the night-time. The reduction of the lighting level under the recommended values generates a rapid increase of the indirect losses, so that the electric power saving necessary to the lighting systems cannot be obtained by reducing the lighting level, but it can be obtained only by using highly efficient lighting installations which are able to ensure the adequate lighting level.

Measurement of the Electrical Resistance of Biocomposites Obtained by Recycling PET Waste

Corina NICOLAE, Daniela BULEANDRĂ, Maria CĂȘĂRIU

EEA 2008 | vol. 56 | nr. 4 | art. 12

Metal Halide Lamps. Mathematical Model for Sizing Power Supply

Nicolae GOLOVANOV, Radu PORUMB, Constantin IVANOVICI, Ionel POPA, Gheorghe GHIUR, Yann Alexander CARACOTA, Mioara MAZILU, Dragoş ROSMETENIUC

EEA 2009 | vol. 57 | nr. 4 | art. 6

Modeling Torque Motors with Finite Element Method (FEM) for Direct Drives

Paul MINCIUNESCU, Radu CÂRNARU

EEA 2007 | vol. 55 | nr. 3 | art. 5

Modern Vacuum Switching System for Supplying and Protecting 27.5 kV Lines of Rail Transport

Gheorghe DUMITRESCU, Gheorghe ȚULUCA, Paula ANGHELIȚĂ, V. TRUȘCĂ, V. BARBU

Conferința INFRANTRANS 2005, Bucureşti, ROMANIA

Moving Arc Study and Plasma Diagnosis in the Case of Vacuum Interrupter with TMF Contacts

Dan PAVELESCU, Gheorghe DUMITRESCU, Gabriela PAVELESCU, Florin GHERENDI, Smaranda NIȚU, Viorel BRAIC, Paula ANGHELIȚĂ

IEEE Transactions on Plasma Science, vol. 35, issue 4, part. 2, August 2007

MRI Imaging Methods in the Medical Investigation of the Pielocaliceal System

Daniela BULEANDRA

EEA 2008 | vol. 56 | nr. 1 | art. 18

New Technical Solutions for the Modernization of Infrastructure in Terrains and Underground Railways

Daniela BULEANDRĂ, Maria CĂȘĂRIU, Corina NICOLAE, Ştefan OPREA

EEA 2008 | vol. 56 | nr. 4 | art. 7

Operation of Compact Fluorescent Lamps in the Electrical Network

Nicolae GOLOVANOV, Radu PORUMB, Constantin IVANOVICI, Virgil RICICOVSCHI, Ionel POPA, Iulian TURCU, Dragoş ROSMETENIUC

EEA 2009 | vol. 57 | nr. 4 | art. 10

Outdoor Lighting Sources with LEDs. Determination of the Maximum Power Developed in the Semiconductor Structure

Radu PORUMB, Nicolae GOLOVANOV, Mioara MAZILU, Constantin IVANOVICI, Ionel POPA, Sidonia CRĂCIUN, Iulian TURCU

EEA 2009 | vol. 57 | nr. 3 | art. 9

Post-Arc Current in Low-Voltage Vacuum Circuit breaker: Measurements and Physical Peculiarities

Dan PAVELESCU, Smaranda NIȚU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

IEEE Transactions on Plasma Science, vol. 31, issue 5, pag. 869-876, 2003

This paper presents the main peculiarities of the post-arc (p.a.) current within the low-voltage switching process in a vacuum as compared with the medium-voltage p.a. current. The high-frequency p.a. current oscillation is measured and mathematically described. There are two high-frequency components produced by the equivalent scheme of the circuit breaker and by the nonlinear characteristic of the p.a. residual plasma. Also described is the influence of the axial magnetic field (AMF) on the p.a. current evolution and high-frequency oscillation. The authors have noticed that the nonlinear p.a. high-frequency component, produced by nonlinear characteristic of residual plasma, is severely damped by the AMF. Using an analytical approach of the phenomenon, this study also provides a general mathematical model for the p.a. current. The results of the mathematical model contribute to a better understanding of the physical peculiarities of the short-circuit current zero zone.

Reducing Operating Costs in Public Lighting Systems by Upgrading the Current System

Nicolae GOLOVANOV, Radu PORUMB, Constantin IVANOVICI, Ionel POPA, Dragoş ROSMETENIUC, Mihai CHERSIN, Mircea PARASCHIVA, Sidonia CRĂCIUN, Iulian TURCU

EEA 2009 | vol. 57 | nr. 2 | art. 11

Researches Regarding the Realization of High-class Thermal Insulation Classical Lakes. Elaboration of the Experimental Model

Ionel POPA, George Dan BIDULESCU

EEA 2007 | vol. 55 | nr. 3 | art. 9

Solar Photovoltaic: Fuel Cell Conversion System for Electricity Generation

Sandor BARTHA, Dan Ilie TEODOREANU, Maria TEODOREANU, István FARKAS

EEA 2011 | vol. 59 | nr. 2 | art. 11

The paper presents a case study and application method for the hydrogen storage of the energy produced by a PV solar energy system. A technical analysis of the performance of the 1 kWp rated power PV generator is presented, followed by the description of the conversion of the solar energy into hydrogen and the classical technologies for hydrogen production. The theoretical model for PV hydrogen production, developed for this case study uses the main electrochemical and physical relations and the model data graphically presented. A detailed model for the evaluation of the main fuel cell parameters like efficiency and open circuit voltage is given for the commercial fuel cells.

Some Aspects of Improving the Ultra-High Vacuum Switching

Paula ANGHELIȚĂ, Florin PĂIȘ

Sesiunea de comunicări ştiinţifice ICPE, Septembrie 2000, Bucureşti, ROMANIA

Spatial and Temporal Analysis of the Vacuum Arc Plasma Using Fast Intensified CCD-Spectrograph System

Gabriela PAVELESCU, Dan PAVELESCU, Florin GHERENDI, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

International Conference on „Micro-to-Nano-Photonics” – ROMOPTO 2006, 28 – 31 August 2006, Sibiu, ROMANIA

Study of Arc Motion and Plasma Diagnosis in the Case of Vacuum-Chambers Equipped with TMF Contacts

Dan PAVELESCU, Gheorghe DUMITRESCU, Gabriela PAVELESCU, Florin GHERENDI, Smaranda NIȚU, ViorelBRAIC, Paula ANGHELIȚĂ, Paula LUNGU

Proc. of the Conference “Cercetarea de excelenţă – premiză favorabilă pentru dezvoltarea spaţiului românesc de cercetare”, 22-24 October 2006

Supply System for 1-10 kV Light Discharge Tubes with Gas Discharge

Yann Alexander CARACOTA, Mioara MAZILU, Constantin IVANOVICI, Ionel POPA, Mihai CHERSIN, Nicolae BOTEZATU, Mircea PARASCHIVA, Sidonia CRĂCIUN, Ion VĂVĂRESCU

EEA 2009 | vol. 57 | nr. 3 | art. 12

Sustainable Waste Management in Europe

Rodica Elena CECLAN, Mihai CECLAN, Ionel POPA

EEA 2011 | vol. 59 | nr. 4 | art. 9

The Influence of the Transverse Magnetic Field (TMF) on the Electric Arc Developed in Vacuum Circuit Breakers

Gabriela PAVELESCU, Dan PAVELESCU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ, Paula LUNGU, Florin GHERENDI, Viorel BRAIC

Simpozionul ştiinţific „55 de ani de activitate al grupului ICPE în dezvoltarea sectorului electrotehnic“, 20-21 Septembrie 2005, Bucureşti, ROMANIA

The Present Stage of the Electric Scooter Development

Mihaela MÂNZICU

EEA 2014 | vol. 58 | nr. 3 | art. 15

This paper deals with the present stage of the electric scooter development. Starting from some constructive examples it has resulted that the electric scooter represents an extremely efficient transportation alternative from the economic and environment protection viewpoints. Also, we studied the electric scooters from the electric domain viewpoint, the reference model being one of the most advanced scooter models, the Vectrix scooter, and shows the features of the motor, the control system and the accumulators for this model.

The Use of Compact Fluorescent Lamps for Efficient Lighting

Anton RĂDULESCU, Constantin DINULESCU, Ion VĂCĂRESCU, Gheorghe GHIUR, Nicolae GOLOVANOV, Laurenţiu LIPAN, Constantin IVANOVICI, Ionel POPA, Dragoş ROSMETENIUC, Sidonia CRĂCIUN

EA 2009 | vol. 57 | nr. 1 | art. 11

Solutions for Modernizing the Public Lighting of Târgu-Jiu

Paul MINCIUNESCU, Florian LAZĂR, Gabriel RÂȘNOVEANU, Bogdan Dumitru VĂRĂTICEANU

EEA 2011 | vol. 59 | nr. 3 | art. 6

FEM-BEM Technique for Solving the Magnetic Field in Electric Machines

Paul MINCIUNESCU, Stelian MARINESCU, Ioana HĂNȚILĂ, Oana M. DROSU

Revue roumaine des sciences techniques Série Électrotechnique et Énergétique, 2011, issue 2

This work presents an efficient iterative FEM-BEM procedure for the computation of the magnetic field in electric machines. The magnetic field is determined separately, by FEM, for a stator and rotor pole pitch, under the assumption that the vector potential satisfies Dirichlet and periodic boundary conditions. The normal derivative of the potential is obtained, which is then introduced into the integral equation written for the air region boundaries, thus yielding the new value of the potential. The numerical expression of the integral equation takes into account the periodicity of the geometrical structure and defines the relationship between the normal derivative and potential only for a polar pitch. The convergence of the procedure is ensured by the large value of the ferromagnetic permeability. For nonlinear media, the large value of the permeability is maintained by applying the polarization fixed point method.

The Use of Compact Fluorescent Lamps for Lighting and Visual Comfort Objectives

Constantin IVANOVICI, Nicolae GOLOVANOV, Aurelia IONESCU, Ionel POPA, Cristian LUNGANU

EEA 2011 | vol. 59 | nr. 3 | art. 9

In this paper, we studied the quality and proper choice of the interior lighting system that may affect the efficiency in an important measure of the human activity. Lighting systems are adapted to the physiological aspects of the eye (mechanical work), while others should take into account an important component of the human psychology (in schools or halls protocol).

Two Wheeled Electric Vehicle - A Solution for Implementing an Ecological Transport

Mihaela SCORȚESCU

EEA 2008 | vol. 56 | nr. 1 | art. 6

Ecological LFC Design and Environmental Protection

Constantin IVANOVICI, Nicolae GOLOVANOV, Aurelia IONESCU, Viorel IONESCU, Ionel POPA, Eleonora ȚIPU

Simpozion „Impactul acquis-ului comunitar de mediu asupra tehnologiilor şi echipamentelor” – ACQUISTEM 2011, ICPE-Agigea, pag.21, ISBN 978-606-507-0608, editura ELECTRA, 28 – 29 iulie

Sustainable Waste Management in Europe

Rodica Elena CECLAN, Mihail CECLAN, Ionel POPA

Simpozion „Impactul acquis-ului comunitar de mediu asupra tehnologiilor şi echipamentelor” – ACQUISTEM 2011, ICPE-Agigea, pag.29, ISBN 978-606-507-0608, editura ELECTRA, 28 – 29 iulie

The Use of the Thermal Image for the Thermal Phenomena Analysis of the Fuse Element of the High Voltage Fuse

Valer GIURGIU, Costin CEPIȘCĂ, Gheorghe OARGĂ, Stergios GANASTIOS, Liliana ȘTEFĂNESCU

EEA 2009 | vol. 57 | nr. 1 | art. 2

Sustainable Development, an Immediate Necessity of Contemporary Society

Alexandru Eugeniu STERE, Ionel POPA

EEA 2011 | vol. 59 | nr. 4 | art. 12

Analysis of Electric Machine Magnetic Field Using an Iterative 2D FEM BEM Technique

Paul MINCIUNESCU, Ioana HĂNȚILĂ, Stelian MARINESCU

14th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, Graz, Austria, 19- 22 September 2010

Use of Linear Motors for High-Precision Displacements

Paul MINCIUNESCU, Caius GAMULESCU, Iulian VASILE, Anton-Mugurel SPIRESCU

The Romanian Review Precision Mechanics, Optics & Mechatronics, 6 2010 (20), No. 38

Evolutions of Romanian Electrical Engineering and Specific Entrepreneurship

Nicolae VASILE, Floarea VASILE

Colocviul: Incurajarea antreprenoriatului pentru initierea de afaceri in domeniul inginerie electrica, Bucuresti, 2010

Energy Efficiency in Electrical Lighting

Paul PENCIOIU, Constantin IVANOVICI, Ionel POPA, Radu PORUMB, Nicolae GOLOVANOV, Gheorghe GHIUR, Stelian MATEI

A 45-a Conferinţă Naţională de Instalaţii Electrice şi Automatizări SIEAR 2010, secţiunea „Creşterea performanţei energetice a clădirilor şi a instalaţiilor aferente”, 13 – 15 octombrie 2010, Sinaia

Metal Halide Lamps and Electronic Ballasts Used for Public Lighting

Gheorghe GHIUR, Radu PORUMB, Constantin IVANOVICI, Ionel POPA, Daniel Emilian DOBRESCU, Ion VĂCĂRESCU

EEA 2010 | vol. 58 | nr. 2 | art. 9

Marine Propeller with Embedded Electric Motor

Paul MINCIUNESCU, Stelian MARINESCU

Simpozionul de maşini electrice SME’09, 2009

Direct Drive Systems for Industry Applications

Paul MINCIUNESCU, Mihaela SCORȚESCU, Stelian MARINESCU, Radu CÂRNARU, Corina MINCIUNESCU, Corneliu GORNIC

Simpozionul de maşini electrice SME’09, Octombrie 2009

Basic Elements for Drawing up the Action Plan for Climate Change

Adriana BORȘ, Mihai LESCIC, Aurelia MEGHEA, Ionel POPA

International Symposium „The Environment and Industry” – SIMI 2009, INCD-ECOIND, Proceedings Symposium, pag.92-104, ISBN 978-606-507-039-4, editura ELECTRA, 28 – 30 octombrie 2009

Integrated Waste Management Systems in Europe

Rodica Elena CECLAN, Mihai CECLAN, Aurelia MEGHEA, Diamantino LOPES, Paulo BAPTISTA, PatriciaTERCEIRO, Ionel POPA

International Symposium „The Environment and Industry” – SIMI 2009, INCD-ECOIND, Proceedings Symposium, pag.17-30, ISBN 978-606-507-039-4, editura ELECTRA, 28 – 30 octombrie 2009

Control Charts Applied to an Air Monitoring Pollutant with Linear Trend

Irina MEGHEA, MihaelaMIHAI, Ionel POPA, Stergios GANATSIOS

16th Romanian International Conference on Chemistry and Chemical Engineering, September 9 – 12, 2009, CD conferinţă, W.I. O-07, Sinaia, România

Ecological Varnishes Used for Impregnation of Electrical Motors Thermal Class H

Ionel POPA, Dan BIDULESCU, Rodica CECLAN, Patricia TERCEIRO, Aurelia MEGHEA

16th Romanian International Conference on Chemistry and Chemical Engineering, September 9 – 12, 2009

Public Lighting Luminaires Using LED Technologies - the Most Economical and Environmentally Friendly Lighting Solutions

Virgil RACICOVSCHI, Ion PĂUNA, Constantin IVANOVICI, Ionel POPA, Iulian TURCU, Sidonia CRĂCIUN

Simpozionul „Impactul ACQUIS-ului comunitar de mediu asupra tehnologiilor şi echipamentelor”, ediţia a 6-a, 26-28 august 2009

Indoor Lighting of Buildings with Gas-Discharge Tubes

Yan Alexandre CARACOTA, Mioara MAZILU, Constantin IVANOVICI, Ionel POPA, Mihai CHERSIN, Valentin DÂMBOIU, Nicolae BOTEZATU, Sidonia CRĂCIUN

EEA 2009 | vol. 57 | nr. 1 | art. 9

Trends and Issues in the Elaboration and Production of the Lighting Fittings

Constantin IVANOVICI, Viorel IONESCU, Eleonora ȚIPU, Ionel POPA

EEA 2010 | vol. 58 | nr. 2 | art. 7

This paper deals with major types of lighting fittings used in the household lighting, taking into consideration the new directions regarding the obsolescence of the incandescent electric lamps (LEI) (of 100 W power) and their replacement by tubular fluorescent lamps (LFT), compact fluorescent lamps (LFC) or, more recently, lighting fittings with LED modules. These increase the luminous efficiency level from 10-14 lm/W (the incandescent electric lamps) to 50-80 lm/W (the LFT, LFC or LEDs) and reduce the electric power consumptions by half compared to LEI.

Developing the Romanian Research Area Between Necessity, Opportunity, Feasibility and Subsidiarity

Nicolae VASILE, Floarea VASILE

Sesiunea Stiintifica – Program CEEX 2 – Modul I, Universitatea Alexandru Ioan Cuza, Iasi, 18-19 septembrie 2008

Increased Energy Savings and Reliability through New Materials and Manufacturing Technologies for High Voltage Gas Discharge Tubes

Yan Alexandre CARACOTA, Constantin IVANOVICI, Ionel POPA, Radu PORUMB

EEA 2008 | vol. 56 | nr. 1 | art. 14

Energy Saving in Bucharest by Using Economical Lighting Systems

Nicolae GOLOVANOV, Radu PORUMB, Constantin IVANOVICI, Doru PĂTULEA, Cornel TOADER, Sorin POSTOLACHE, Ionel POPA, Ecaterina FRANSUA

EEA 2008 | vol. 56 | nr. 1 | art. 12

The Risk Management Tool for the Integrated Management Systems

Liliana PUȘCAȘ, Adriana Mihaela IONESCU, Bica ZORLESCU

EEA 2010 | vol. 58 | nr. 4 | art. 14

The risk management is a cyclical, continuous process by which decisions in order to remove, diminish or accept the risks are taken, the risk management needs an identification and the analysis of some theoretical matters. Identifying the difficulties and their management lead to success while the unknowledge of risks or to ignore them lead to failure. Practising the risk management brings greater opportunity of succes. Identifying in advance the risks to which the organization is exposed could prevent their negative effects turning out sometimes these risks in the own advantage. The success of an organization depends on the good management of the risk management tools. Their utilization serves to avoid the mistakes, prevent the risks or counteract in time their adverse effects. The risk management process presumes covering five stages: setting of context the risks emerge, their identification and definition, the analysis, development and implementation of response to hazards methods, monitoring , reporting and updating of risk management.

Quality of Electric Actuator Design

Floarea VASILE, Mircea COVRIG

EEA 2007 | vol. 55 | nr. 1 | art. 7

Evaluation of the Research Structure in Romania in Relation to the Trends in the European Research Area - ERA

Floarea VASILE, Nicolae VASILE

EEA 2007 | vol. 55 | nr. 3 | art. 13

Romanian Integration in ERA a Cooperation Opportunity between Science and Industry

Nicolae VASILE, Floarea VASILE

CCIB 20 iunie 2007; ”REFORM-regional Economic RTD Policy through Foresight & Mentoring”, etapa din Romania: Bucuresti, CCIB, 18-20.06.2007

1,2-Disubstituted 2-Imidazolinyl Derivatives. Technological Study

Angela LUPU, Ionel POPA, Constantin DRĂGHICI, Maria Gabriela ALEXANDRU

Revista de Chimie 58 (7)/2007, pag.636-639, ISSN 0034-7752

Electroinsulating Varnish on the Base of Resins which are Soluble in Water-Alcohols for Electric Motor Impregnation

Ionel POPA, George Dan BIDULESCU, Georgeta NAGHIU, Ion PĂUNA

The first workshop of Electrical Engineering Materials and Aplications, 21 september 2005, ICPE-CA Bucharest

Implementation of European Directives on Waste and Packaging Management

Paul PENCIOIU, Sanda COTESCU, Ionel POPA, Carmen POPESCU, Nicolae GRAMA, Ani MERLĂ

Revista ECOTERRA, nr.3, decembrie 2004, Cluj-Napoca

Air Quality Monitoring Station in Constanta

Nicolae VASILE, Paul PENCIOIU, Sanda COTESCU, Ionel POPA, Carmen POPESCU, Georgeta NAGHIU

Simpozion “Ziua internaţională pentru protecţia stratului de ozon”, 16-17 septembrie 2004, Constanța

Design and Realization of Experimental Models within Urban Selective Urban Waste Collection System and Air Monitoring System

Sanda COTESCU, Ionel POPA

Icpe, vol. II, mai 2004, Bucureşti

Optical Diagnostics of the Vacuum Arc Using Fast Intensified CCD - Spectrograph System - 2

Gabriela PAVELESCU, S. GUILLOT, Mariana BRAIC, Dunpin HONG, Dan PAVELESCU, Claude FLEURIER Viorel BRAIC, Florin GHERENDI, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

VII-th International Conference on Optics – ROMOPTO 2003, 8 – 11 Septembrie 2003, Constanta, ROMANIA

Imidazoline Derivatives Synthesized in Heterogeneous Catalysis

Ionel POPA, Victor PĂRĂUȘANU, Angela LUPU

Conferinţa de chimie şi inginerie chimică, Ediţia a XIII-a, UPB, Fac.Chimie Industriala, sept.2003, Bucureşti

Coating Polymeric Compounds

Maria-Magdalena IORDĂCHESCU, Ileana MĂDESCU, Ionel POPA

Conferința națională ‘’Direcții noi de cercetare în ştiinţa materialelor’’, Asociația Româna de Materiale, 17-22 septembrie 2001, Constanța

Ammonium Quaternary Salts of 1,2-Disubstituted Imidasolinic Derivates

Ionel POPA, Angela LUPU, Victor PĂRĂUȘANU, Gabriela SCORȚEANU

12th Romanian International Conference Chemistry and Chemical Engineering, UPB, 13-15 september 2001, Bucharest

Electroconductive Polymeric Composites Obtained by in Situ Polymerization of Aniline in a Polyester Matrix

Maria-Magdalena IORDĂCHESCU, leana MĂDESCU, Ionel POPA

Sesiunea omagială de comunicări ştiinţifice ‘’Electrotehnica în dezvoltarea durabilă a societăţii’’ Icpe, 24-26 octombrie 2000, București

Imidazoline Derivatives Used for the Polymerisation of Epoxy Resins

Ionel POPA, Victor PĂRĂUȘANU

Lucrările Icpe şi CD al Sesiunii de comunicări ştiinţifice “Materiale şi componente electrotehnice“, ICPE, 11-12 septembrie 2000, Bucureşti

1,2-disubstituted 2-imidazolinyl derivatives. Technological study

Nicolae VASILE, Floarea VASILE

Revista de Chimie 58 (7)/2007, pag.636-639, ISSN 0034-7752

Upon the Interaction of Magnetic Field and Electric Arc in Low Voltage Vacuum Circuit-Breakers

Smaranda NIȚU, Dan PAVELESCU, Constantin NIȚU, Gheorghe DUMITRESCU, Paula ANGHELIȚĂ

VIth International Conference of Scientific Computing in Electrical Engineering SCEE 2006, 17-22 Septembrie 2006, Sinaia