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Aproximadamente 509 registro(s) hasta el momento: (journal)

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Recurso libre

Sampling of Random Data Streams
Cepciansky, Gustav - Schwartz, Ladislav

Formato:	,
Enlaces:	Modern telecommunication networks work on the transmission method of common data streams in which data bursts consisting of packets that further consist of particular bits are multiplexed from various traffic sources. The larger amount of data is transmitted through a…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Erlang C Formula and its Use in the Call Centers
Chromy, Erik; Slovak University of Technology - Misuth, Tibor - Kavacky, Matej

Formato:	,
Enlaces:	This paper deals with calculation of important parameters of the Call Center using the Erlang C formula and then results are verified through simulations. Erlang C formula is defined as a function of two variables: the number of agents N…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Far-end Crosstalk Modeling Based on Capacitive and Inductive Unbalances Between Pairs in a Cable
Lafata, Pavel

Formato:	,
Enlaces:	This article deals with new ways of far-end crosstalk (FEXT) modeling in multi-pair and multi-quad metallic cables. Current standard modeling methods provide only rough estimations of FEXT characteristics based on average values of crosstalk for the whole cable. However, for…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Time Delay Estimation Algoritms for Echo Cancellation
Sakhnov, Kirill - Verteletskaya, Ekaterina - Simak, Boris

Formato:	,
Enlaces:	The following case study describes how to eliminate echo in a VoIP network using delay estimation algorithms. It is known that echo with long transmission delays becomes more noticeable to users. Thus, time delay estimation, as a part of echo…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Harmonic Orientation of Pulse Width Modulation Technique in Multilevel Inverters
Bandaru, Urmila - Rayudu, Subba D

Formato:	,
Enlaces:	The Multilevel Inverter topology gives the advantages of usage in high power and high voltage application with reduced harmonic distortion without a transformer. This paper presents a comparative study of orientation of higher ordered harmonics with increase in switching frequency…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Feedforward Control of Electrical Drives - Rules and Limits
Malek, Michal - Makys, Pavol - Stulrajter, Marek

Formato:	,
Enlaces:	Nowadays, there are several application in the field of position controlled electric drives, such as high speed cutting, where traditional cascade control structures provide insufficient accuracy. Therefore, it is necessary either to completely change the control structure (e.g. sliding mode…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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An Elimination of Resonance in Electric Drives
Malek, Michal - Makys, Pavol - Stulrajter, Marek

Formato:	,
Enlaces:	Flexible couplings together with resonance phenomenon are present mainly in the field of servodrives where high accuracy and dynamic requirements are crucial. When dynamics doesn’t correlate with mechanical system design, unwanted frequencies in the system are exited. Sometimes we haven’t…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Optical Fiber Sensor with Distributed Parameters Based on Optical Fiber Reflectometry
Korenko, Branislav - Jasenek, Jozef - Cervenova, Jozefa - Hlavac, Marek

Formato:	,
Enlaces:	His paper deals with the two-stage two-phase electronic systems with orthogonal output voltages and currents - DC/AC/AC. Design of two-stage DC/AC/AC high frequency converter with two-phase orthogonal output using single-phase matrix converter is also introduced. Output voltages of them are…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Design, Modelling and Simulation of Two-Phase Two-Stage Electronic System with Orthogonal Output for Supplying of Two-Phase ASM
Prazenica, Michal - Dobrucky, Branislav - Sekerak, Peter - Kalamen, Lukas

Formato:	,
Enlaces:	This paper deals with the two-stage two-phase electronic systems with orthogonal output voltages and currents - DC/AC/AC. Design of two-stage DC/AC/AC high frequency converter with two-phase orthogonal output using single-phase matrix converter is also introduced. Output voltages of them are…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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10.

Fiber Optical Sensor for High Temperatures
Hanacek, Frantisek; Site Administrator - Latal, Jan - Koudelka, Petr - Skapa, Jan - Siska, Petr - Vasinek, Vladimir - Hurta, Jan

Formato:	,
Enlaces:	The fiber optic sensors are used in various industries. Advantages of optical sensors are based on the benefits of fiber and partially profit at their technological advances. The fiber optic temperature sensors are based on more than one way of…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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11.

Influence of Magnetic Field on Electric Charge Trasport in Holmium Thin Film at Low Temperature
Dudas, Jan - Gabani, Stanislav - Bagi, Jozef - Goscianska, Iwona - Hodulikova, Anna

Formato:	,
Enlaces:	High precision electrical resistance measurements were performed in the low temperature range from 4.2 K up to room temperature on a holmium bulk sample, and on holmium thin films in magnetic field. The X-ray diffraction of Ho films confirmed their preferential crystal…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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12.

Binary Modulation Formats in Optical Access Networks
Tejkal, Vladimir - Filka, Miloslav - Reichert, Pavel - Sporik, Jan

Formato:	,
Enlaces:	In this paper the binary modulation formats and their application in passive optical networks have been discussed. Passive optical networks are characterized by dividing the optical signal between several end users by using passive splitters, which added a significant attenuation…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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13.

Removal of a Degraded Concrete Layer with Emphasis on the Surface Optimization Before Application of Repair Material
Janurova, Eva - Pustelnik, Jan - Hlavac, Libor

Formato:	,
Enlaces:	This contribution is concerned with the modelling of destructive effects of a high-velocity water jet, used as a tool for preparation of surfaces during reconstructions, on a degraded layer of concrete. The destruction action of a water jet on model material…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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14.

Security Risks in IP Telephony
Rezac, Filip; Proofreader - Voznak, Miroslav

Formato:	,
Enlaces:	This paper deals with VoIP communication security and various techniques of VoIP attacks. We divided these threats in several categories according to their specific behaviour and their impact on the affected system. We also tried to find effective methods to…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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15.

Delay Variation Model with Two Service Queues
Rezac, Filip; Proofreader - Voznak, Miroslav - Hromek, Frantisek

Formato:	,
Enlaces:	Delay in VoIP technology is very unpleasant issue and therefore a voice packets prioritization must be ensured. To maintain the high call quality a maximum information delivery time from the sender to the recipient is set to 150 ms. This…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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16.

Current Condition in the Transport Telematics
Mikulski, Jerzy; Silesian University of Technology, Katowice - Kedziora, Kacper

Formato:	,
Enlaces:	The term “telematics”, which originated more than ten years ago, stands for integration of technologies and solutions from the field of telecommunication, automation and computer science. Telematics is the combination of words “tele” (transfer at some distance, remote access) and…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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17.

Introduction to Feedforward Control of Electric Drives - Rules and Limits
Malek, Michal - Makys, Pavol - Stulrajter, Marek

Formato:	,
Enlaces:	Electric servodrives are characterized by precise tracking and its derivations. The way to meet this goal cost them a number of obstacles, whether variations associated with end-stage of astatism, changes in the positioning system parameters or to changes in load…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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18.

Short-Term Load Forecast in Electric Energy System in Bulgaria
Asenova, Irina - Georgiev, Dimitar

Formato:	,
Enlaces:	As the accuracy of the electricity load forecast is crucial in providing better cost effective risk management plans, this paper proposes a Short Term Electricity Load Forecast (STLF) model with high forecasting accuracy. Two kind of neural networks, Multilayer Perceptron…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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19.

Novel Wien Bridge Oscillator Design Using Functional Block Structure with Current Conveyors
Brandstetter, Pavel; VSB-Technical University of Ostrava - Klein, Lukas; VSB-Technical University of Ostrava

Formato:	,
Enlaces:	The purpose of this paper is to generally present possibilities of the current conveyor use in the well-known active electronic circuits. Current conveyors are able to substitute all known active elements. This claim is supported by the fact, that four…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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20.

Electric Vehicle Control Units Communication
Slivka, David - Palacky, Petr - Vaculik, Petr - Havel, Ales

Formato:	,
Enlaces:	Article handles with control units cooperation, which is usable in drive control application especially in electric vehicle. Control unit with Freescale Digital Signal Controller 56F8037 is used as main subject of this research. CAN bus has been selected for control…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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21.

Detector of Covered Conductor Faults
Hamacek, Stefan; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava - Misak, Stanislav; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava

Formato:	,
Enlaces:	In the Czech Republic are bare conductor lines replaced by cover conductor lines. The cover conductor lines have many advantages. Advantages and disadvantages of PAS system are described in this paper. This article describes issue of fault detection for lines…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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22.

On PID Controller Design Using Knowledge Based Fuzzy System
Nowakova, Jana; VSB-Technical University of Ostrava - Pokorny, Miroslav; VSB-Technical University of Ostrava

Formato:	,
Enlaces:	The designing of PID controllers is a frequently discussed problem. Many of design methods have been developed, classic (analytical tuning methods, optimization methods etc.) or not so common fuzzy knowledge based methods which are designed to achieve good setpoint following,…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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23.

Medical Image Denoising by Improved Kuan Filter
Benes, Radek - Riha, Kamil

Formato:	,
Enlaces:	This paper focuses on the issue of speckle noise and its suppression. Firstly, the multiplicative speckle noise model and its mathematical formulation are introduced. Then, certain de-noising methods are described together with possible improvements. On their basis, an improvement of…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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24.

Fuzzy Methods and Image Fusion in a Digital Image Processing
Vlach, Jaroslav - Kolar, Milan

Formato:	,
Enlaces:	Although the basics of image processing were laid more than 50 years ago, significant development occurred mainly in the last 25 years with the entrance of personal computers and today's problems are already very sophisticated and quick. This article is…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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25.

An Efficient TFETI Based Solver for Elasto-Plastic Problems of Mechanics
Cermak, Martin - Kozubek, Tomas

Formato:	,
Enlaces:	This paper illustrates how to implement effectively solvers for elasto-plastic problems. We consider the time step problems formulated by nonlinear variational equations in terms of displacements. To treat nonlinearity and nonsmoothnes we use semismooth Newton method. In each Newton iteration…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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26.

The Study of Sensory Properties of Quasi-Singlemode Fiber
Koudelka, Petr; Department of Telecommunications Faculty of Electrical Engineering and Computer Science VSB-TU Ostrava 17. listopadu 15/2172 708 33 Ostrava-Poruba Czech Republic - Latal, Jan - Siska, Petr - Hanacek, Frantisek - Skapa, Jan - Vasinek, Vladimir

Formato:	,
Enlaces:	The quasi-singlemode fibers are optical fibers with unique properties, the atypical profile structure allows the simultaneous use of optical fiber as transmission media and sensors, based on the distribution of optical power among several modes. In collaboration with the ASČR…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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27.

Sampling Rate Conversion
Vitasek, Jan; Layout Editor

Formato:	,
Enlaces:	The topic of this article is conversion of the signal with given sampling frequency to signal with another sampling rate. The task is to change the sampling rate from fvz3=500Hz to fvz4=360Hz. There are two methods; in the text are called…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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28.

Evaluation of cooperation WPP and PV connected through the shared transformer to the network 22kV
Sumbera, Tomas; VŠB-TU Ostrava, FEI, Katedra elektroenergetiky - Strida, Frantisek; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava - Hradilek, Zdenek; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava - Rusek, Stanislav; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava

Formato:	,
Enlaces:	The article deals with evaluation the cooperation possibility of wind and solar power plants connected through the common transformator to the 22kV network. Cooperation evaluation is, based on measured data, for wind power plant about installed capacity 2MW and for…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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29.

Generating Parallel Applications from Models Based on Petri Nets
Bohm, Stanislav; Faculty of Electrical Engineering and Computer Science, VSB - Technical University of Ostrava - Behalek, Marek; Faculty of Electrical Engineering and Computer Science, VSB - Technical University of Ostrava

Formato:	,
Enlaces:	Parallel and distributed systems play an important role in the development of information technologies and their applications today. These systems are very useful but their development and usage is inherently more difficult. A solution can be a tool focused on…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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30.

Automated Region of Interest Retrieval of Metallographic Images for Quality Classification in Industry
Kotas, Petr; Department of Applied Mathematics (K 470) Faculty of Electrical Engineering and Computer Science (FEI) VSB-Technical University of Ostrava Tr. 17. listopadu 15 CZ 708 33 Ostrava-Poruba Czech Republic - Praks, Pavel; Department of Applied Mathematics (K 470) Faculty of Electrical Engineering and Computer Science (FEI) VSB-Technical University of Ostrava Tr. 17. listopadu 15 CZ 708 33 Ostrava-Poruba Czech Republic - Valek, Ladislav; Research – Production Technology, ArcelorMittal Ostrava plc, Ostrava, Czech Republic - Zejkovic, Vesna; New York Institute of Technology, School of Engineering & Computing Sciences, Nanjing campus, China - Vondrak, Vit; Department of Applied Mathematics (K 470) Faculty of Electrical Engineering and Computer Science (FEI) VSB-Technical University of Ostrava Tr. 17. listopadu 15 CZ 708 33 Ostrava-Poruba Czech Republic

Formato:	,
Enlaces:	The aim of the research is development and testing of new methods to classify the quality of metallographic samples of steels with high added value (for example grades X70 according API). In this paper, we address the development of methods…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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31.

Surface Effect on Three Phase Lines of Low-Ohmic Furnaces
Novak, Pavel

Formato:	,
Enlaces:	The article another option of using numerical method of elementary conductors in surface effect three-phase supply linesfor low-ohmic furnaces. Impedance asymmetry of three-phase supply lines of different conductor profiles and various spaceconfigurations is analysed following to the author`s article published…
Fecha:	2011-06-29
Recurso:	Advances in Electrical and Electronic Engineering

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32.

WDM in Courses of Communication Technologies
Filka, Miloslav - Bernkopf, Miroslav

Formato:	,
Enlaces:	This conference paper shows and demonstrates how modern technologies (such as WDM – Wavelength Division Multiplex) were introduced to students of Optical Networks lectured at Brno University of Technology, Faculty of Electrical Engineering and Communication, Dept. of Telecommunications.
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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33.

Epitaxial Layers of InP Doped With Rare Elements for Use in Radiation Detector
Kozak, Halyna - Sopko, Bruno - Zdansky, Karel

Formato:	,
Enlaces:	We have focused on the investigation of the impact of Ce, Eu, Tm, Eu2O3 and Tm2O3 addition in LPE growth process on the properties of InP layers in the context of their application in detector structures.
Fecha:	2011-06-20
Recurso:	Advances in Electrical and Electronic Engineering

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34.

Science is a Part of the Culture
Turek, Ivan

Formato:	,
Enlaces:	The contribution points on relation between sciences and various aspects of the life of a society. The relation of physics and mathematics with technical disciplines is stressed. It is accented that technical education should be based on a mathematical and…
Fecha:	2011-06-29
Recurso:	Advances in Electrical and Electronic Engineering

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35.

Note on the Methodology of Measuring the Attenuation of Acustic Waves in Solid State
Sidor, Peter - Vajda, Drahoslav

Formato:	,
Enlaces:	The presented paper is a note on the methodology of measuring the attenuation of ultrasonic waves in the case of observation device not facilitating a direct measurement of the attenuation based on the definition of the ratio of amplitudes. Instead…
Fecha:	2011-06-29
Recurso:	Advances in Electrical and Electronic Engineering

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36.

Intermodal Interference as a Source of Information on Optical Fibres
Kacik, Daniel - Turek, Ivan - Martinecek, Ivan - Grendár, Drahomír

Formato:	,
Enlaces:	A basic description of intermodal interference which follows possibility investigation of intermodal interference in spectral and space region. There is also a brief description of equipments used for such investigation and some illustrations of obtained results. There is pointed in the…
Fecha:	2011-06-29
Recurso:	Advances in Electrical and Electronic Engineering

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37.

Four-Wave Mixing Aplication in Semiconductor Optical Amplifier
Odrobinak, Radoslav

Formato:	,
Enlaces:	Four-Wave Mixing (FWM) in semiconductor optical amplifiers is an attrative mechanism for wavelenght coversion in wavelenght-division multiplexed (WDM) systems since it provides modulation format and bit rate transparency over wide tuning ranges. A series of systems experiments evaluating several aspects…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

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38.

Diagnostics and Reconfiguration of Control Systems
Krokavec, Dusan - Filasova, Anna

Formato:	,
Enlaces:	This contribution summarizes some of the major trends, as well as real opportunities for the application of system fault diagnosis and reconfiguration control structures in automatic control systems. There are referenced ongoing concepts for residual generation, described design approaches in virtual reconfiguration…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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39.

Mathematical Model of Thyristor Inverter Including a Series-parallel Resonant Circuit
Luft, Miroslaw; Technical University of Radom - Szychta, Elzbieta

Formato:	,
Enlaces:	The article presents a mathematical model of thyristor inverter including a series-parallel resonant circuit with theaid of state variable method. Maple procedures are used to compute current and voltage waveforms in the inverter.
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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40.

Possibilities of Genetic Algorithm Application in the Calculation of Power Networks Operation,
Rapsik, Miroslav - Altus, Juraj

Formato:	,
Enlaces:	The paper describes the possibilities of genetic algorithm application by the reactive power flows’ optimization in Slovak power transmission system. The methods of reactive power flow calculation and the utilization of genetic algorithms for their minimalization are indicated in the…
Fecha:	2011-06-20
Recurso:	Advances in Electrical and Electronic Engineering

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41.

Location in Mobile Networks Using Database Correlation (DCM)
Mada, Michal - Duha, Jan

Formato:	,
Enlaces:	The article presents one of the methods of location (DCM), which is suitable for using in urban environments, where other methods are less accurate. The principle of this method is in comparison of measured samples of signal with samples stored…
Fecha:	2011-06-20
Recurso:	Advances in Electrical and Electronic Engineering

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42.

High-Freqeuncy Analysis of Three-Winding Autotransformers 400/121/34 kV
Gutten, Miroslav - Brandt, Martin - Polansky, Roman - Prosr, Pavel

Formato:	,
Enlaces:	This article deals with a description of methods of an experimental analysis concerning the actual condition of windings and magnetic circuit of the autotransformer, which is required in power transmission companies all over the world.
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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43.

Analysis of PMMT Operation for Renewable (PV/FC) Energy Source
Sul, Robert - Fibich, Peter - Frivaldsky, Michal

Formato:	,
Enlaces:	Utilization and construction of renewable energy sources require complexity of whole system. It is considered touse a set of devices that are necessary for energy conversion, accumulation, preparation and its distribution into electrical power supply network. The way of realization…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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44.

Advanced Ceramics Electronics Application
Trnka, Pavel - Bujalobokova, Magdalena

Formato:	,
Enlaces:	Ceramics materials infringe human life from early years of the humankind. Together with the progress of the science and engineering, various materials and technologies have been used. Suitable materials and technologies have been used in the proper applications. This paper…
Fecha:	2011-06-20
Recurso:	Advances in Electrical and Electronic Engineering

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45.

Using of the Modern Semiconductor Devices Based on the SiC
Drabek, Pavel

Formato:	,
Enlaces:	This paper deals with possibility of application of the semiconductor devices based on the SiC (Silicon Carbide) inthe power electronics. Basic synopsis of SiC based materials problems are presented, appreciation of their properties incomparison with current using power semiconductor devices…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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46.

The Assessment of Working Conditions of Traction Substation for Power and Reactive Energy
Wojciechowski, Jerzy - Lukasik, Zbigniew

Formato:	,
Enlaces:	In this paper, problems concerning the management of reactive power of DC traction substation have been discussed. The structure of traction system and its main elements has been sketched. Reactive power issue with respect to rectifier sets has been presented.…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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47.

Quality of Power Supply in European View
Prokop, Lukas - Hradilek, Zdenek

Formato:	,
Enlaces:	This paper deals with comparisons of situation in quality of power supply regulation in some of European countries, which are interested in CEER (Council of European Energy Regulators). Especially we focused our analysis on reliability indices, relationship between supplier and…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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48.

Estimates of Quantities in a Hall Effect Geodynamo Theory
de Paor, Annraoi M; NUI Dublin

Formato:	,
Enlaces:	Currents, resistances, dynamo constant, Hall voltage coefficient and inductances are estimated for the author’s geodynamo theory incorporating the Hall Effect. It is concluded that the Hall Coefficient in the bulk liquid core of the Earth is approximately 1.512x10-1, orders of…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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49.

Estimation of Energy Not Supply
Medvec, Zdenek - Prokop, Lukas

Formato:	,
Enlaces:	Damages in industrial company are raising during electrical interruption of power supply. These damages have usually different character and financial damages are most usual. Value of damage is nearly pertinent to type of industrial branch and working load of production…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering

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50.

Analysis of Setups of the Control of Rail Microprocessor Systems
Kornaszewski, Mieczyslaw - Lukasik, Zbigniew

Formato:	,
Enlaces:	In the article will have been introduced possibilities following from the application of the microprocessor technology in rail systems of the control of traffic will remain for example of modern signalling on railway crossings. Introduction to microcomputer and microprocessor systems…
Fecha:	2011-06-17
Recurso:	Advances in Electrical and Electronic Engineering