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Aproximadamente 13825 registro(s) hasta el momento: (journal)

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Recurso libre

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

Recurso libre

Reliability of Telecommunication Systems by Various Repair Regime
Trstensky, Dusan - Schwartz, Ladislav - Trunkvalter, Milan - Bartos, Roman

Formato:	,
Enlaces:	In the past the reliability of the telecommunication systems was evaluated on the simple assumption of the independence of elements. Comuputation of steady - state series - system availability depends on specific assumptions made about the non failed items during…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

Computers and the Teaching of the Technical Subject
Ticha, Dasa - Bores, Petr

Formato:	,
Enlaces:	The contribution deals with the use of computers in the technical subject teaching. It shows more common view on the possibilities of the computer use. It also shows that there is a lin to concrete conditions of the use of…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

Technical Benefits of Tram Vehicle Energy Accumulator
Maciolek, Tadeusz - Drazek, Zbigniew

Formato:	,
Enlaces:	Energy saving effects connected with use of energy accumulator on board of tram vehicle instead of substation are presented. Differences in results regarding weak and strong power supply system when taking into account energy losses and energy recuperation are pointed…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

Features of Traction Transformer Windings Utilised as Inductances
Danzer, Jiri

Formato:	,
Enlaces:	The paper analyses features of traction transformer desing. Secondary windings of the transformer are utilized as a choke of an locomotive input filter at DC supplying system. Different ways of connections of the secondary windings coils are compared, reachable inductances…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

Powers of Traction Rectifier Substation of DC ELectric Railways 3kV
Palecek, Josef

Formato:	,
Enlaces:	The article states main principles of dimensioning of traction supply stations DC traction current system. it also provides detailed results of the traction rectifier substation Ostrava-Svinov load measurement. The measured valued are subsequently used for calculation of characteristic coefficients, whitch…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

Electrical Energy Quality Studies in 3 kV DC Electric Traction Systems for Different Schemes of Connection Traction Substation to Power Utility System
Mierzejewski, Leszek - Szelag, Adam - Jankowski, Pavel

Formato:	,
Enlaces:	The paper present aspects of DC electric traction system influence on electric energetic system. Study is based on modeling and simulation of electrified railway line. After simulation, there was performed analysis of energy quality, whitch using results of simulation and…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

Decentralised Power Active Filters
Roch, Marek - Dobrucky, Branislav - Hosny, Wada M.

Formato:	,
Enlaces:	This paper deals with a decentralised power active filter control based on the separated computation of reference current for each active filter operating under determinated harmonic frequency. The basic principle of such controlled active filter is explained. It is shown…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

Developing Trends of Railway Traffic Control
Tarnai, Geza

Formato:	,
Enlaces:	The future of a railway operator is depending on the success of simultaneous improvement of service quality and cost effectiveness. In this paper we are going to investigate, how traffic control systems - by their developing trends - can contribute…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

10.

Issues of ERTMS Implementation at the Polish Railways
Bialon, Andrzej - Mikulski, Jerzy

Formato:	,
Enlaces:	Short description of ERTMS system. Legal conditions of ERTMS system implementation on Polish Railway. Implemanetation study of the polot ERTMS installation for E-20 Warszawa-Kunowice. Trans-boundary section of ERTMS on the E-65 line Katowice - Bohumin. Necessity of ERTMS implementation with…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

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11.

Optimalization of selected RFID systems Parameters
Vestenicky, Peter

Formato:	,
Enlaces:	This paper describes procedure for maximization of RFID transponder read range. This is done by optimalization of magnetics field intensity at transponder place and by optimalization of antenna and transponder coils coupling factor. Results of this paper can be used…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

12.

Power Analysis of Traction Transformer under Non-Sinusoidal Conditions
Kijonka, Jaromir - Orsag, Petr - Palecek, Josef

Formato:	,
Enlaces:	Article deals with power analysis of traction transformer 100/27 kV, Sn= 10MVA under non-sinusoidal conditions. The power analysis is evaluated by means of IEEE Trial Use Standard Definitions of the Electric Power Quantities under Non-Sinusoidal Conditions, Document Number: IEEE 1459-2000.
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

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13.

Circuit Model of Traction Load under Non-Sinusoidal Conditions
Kijonka, Jaromir

Formato:	,
Enlaces:	Article deals with determination of circuit parameters of the traction load under non-sinusoidal conditions. The circuit parameters are defined by new integral transformation of measured non-sinusoidal voltage and current.
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

14.

Slew Rate and Step Response of the Noninverting Structure with an Operational Amplifier
Puncochar, Josef

Formato:	,
Enlaces:	When a large-step input voltage is applied to an operational amplifier (OP AMP) input, the output waveform reises with a finite slope called the slex rate which is due to an amplifier input stage current limiting (Im) and because of…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

15.

Electromagnetic Phenomena as the Principles of Material Nondestructive Evalution
Capova, Klara; University of Zilina - Cap, Ivo - Faktorova, Dagmar

Formato:	,
Enlaces:	In the paper the principles and application of nondestructive evalution by both electromagnetic acoustic transducer (EMAT) and the eddy current (EC) methods are introducted. The ultrasonic testing (UT) and the electromagnetic nondestructive testing (NDT) are presented with their fundamental properties…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

16.

Analysis of Vibration Microgenerator
Sperova, Alice - Fiala, Pavel

Formato:	,
Enlaces:	This contribution brings numerical results of the analysis of gravitation generator. The draft was created as a part of project trying to increase safety of air traffic.
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

17.

Comparing image compression methods in biomedical applications
Hargas, Libor - Hrianka, Miroslav

Formato:	,
Enlaces:	Compression methods suitable for image processing are described in this article in biomedical applications. The compression is often realized by reduction of irrelevance or redundancy. There are described lossless and lossy compression methods which can be use for compress of…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

18.

Advanced Method of the Elastomagnetic Sensors Calibration
Prascak, Mikulas - Fabo, Peter

Formato:	,
Enlaces:	Elastomagnetic method (EM method) is a highly sensitive non-contact evaluation method for measuring tensile and compressive stress in steel. The latest development of measuring devices and EM sensors has shown that the thermomagnetic phenomenon has a stron influence on th…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

19.

Investigation of High - Frequency Electromagnetic Fields Radiated by Mobile Phone
Darmova, Vilibalda

Formato:	,
Enlaces:	In the last few years mobile phones have become an usual part of our daily life. The number of their users increases rapidly every year. Frequency asked question among general public and among specialist is safety of mobile phones for…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

20.

Preventive Methods for ATM Mode Control
Baronak, Ivan; Slovak University of Technology - Trska, Robert

Formato:	,
Enlaces:	Broadband transfer mode ATM represent one of alternative solutions for growing requirements on transfer capabilities. Its advantage is an effort for provisions of guaranteed quality of transport services with preservations of high transfer rate. This property is covered by several…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

21.

Wavelet Denoising of NMR Signal Using QMF Filter Bank Designed by Remez Algorithm
Kubasek, Radek - Gescheidtova, Eva - Bartusek, Karel

Formato:	,
Enlaces:	The wavelet transform is an up-to-date method for digital signal processing used in many branches of technofogy. One of its applications is the suppression of noise in useful signal. The paper deals with suppressing noise in a signal scanned on…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

22.

Resources of Digital FIR Filters Hardware Implementation in FPGAs for Digital Image Processing in Real Time
Kulla, Peter - Huska, Josef - Cvicela, Peter

Formato:	,
Enlaces:	The main image information content, from the human visual system viewing point, is focused into whole colorimetric and spatial informations. Because every image is result of some previous processes, the goal for all standard image processing methods is improvement colorimetric…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

23.

Measurement of the Switching Force without Force Sensor
Skala, Bohumil; University of West Bohemia in Plzen

Formato:	,
Enlaces:	At the railways, some parts of the a high speed corridor are being finished at present. In these corridors, trains can reach the speed of up to 160 km per hour. Consequently, the demand on switch point machine computer diagnostics…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

24.

Current and Speed Control of the Switched Reluctance Motor
Fort, Jiri

Formato:	,
Enlaces:	The papers deals with the problem of the current and speed control of the switched reculttance motor (SRM) on the base of the proposed mathematical model of the SRM. The basic types of the controllers are described (proportional controller, PI-controller…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

25.

Design and Parametr Analysis of Switched Reluctance Motor with Permanent Magnets
Rafajdus, Pavol - Hrabcova, Valeria - Trak, Ivan

Formato:	,
Enlaces:	This paper deals with Switched Reluctance Motor (SRM) parametr investigation, if permanent magnets are suitable inserted in stator parts to increase magnetic flux. The analysis is made on the base of input geometrical dimensions and materials of a real SRM…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

26.

Linear and Planar Variable Reluctance Motors for Flexible Manufactoring Cells
Szabo, Lorand; Technical University of Cluj Napoca - Viorel, Ioan Adrian - Szepi, Imre

Formato:	,
Enlaces:	Most advances manufactoring processes require precise linear motion for several tasks as material transfer, packaging, assembly or electrical wiring. To achieve precise linear motion, most of the usual high-performance manufactoring machines use X-Y sliding tables with rotary motors and rotary…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

27.

On the Large Synchronous Machine Parameters Calculatioin
Viorel, Ioan Adrian - Simond, Jean Jacques - Xuan, Mai Tu - Vicol, Liliana

Formato:	,
Enlaces:	The large synchronous generators were intensively studied, but not so many papers are entirely dedicated to the analythical calculation of the generator´s parameters. Therefore any contribution should be welcomed if it offers an improvement in the existing procedures or formulae.…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

28.

Intelligent Compact Drive System with a Synchronous Variable Reluctance Motor
Viorel, Ioan Adrian - Szabo, Lorand - Ciorba, Radu C. - Barz, Vasile

Formato:	,
Enlaces:	The increase of energy costs underlines the need to use more efficient drive systems. One of the best solutions to reduce energy costs is the use of variable speed drives. They can easily match motor torque and speed to the…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

29.

Transformer Load-Tap Changers: State-of-Art and Trends
Tesarova, Miroslava - Krasl, Milan

Formato:	,
Enlaces:	Load tap changes (LTC) are a major component of many transformers. They are used to change the voltage of secondary/primary side of a transformer to compensate for voltage variations in the power systems manly caused by variable loading. The paper…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

30.

Excitation of Oscillation on Input Filter of Traction Vehicle with Induction Motor
Lewandowski, Miroslaw

Formato:	,
Enlaces:	The phenomenon of oscillation created on input filter of traction vehicle with induction motor is analyzed here. Instability of the filter may occur especially in case when the receiver is responsible for the filter load and its power is maintained…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

31.

Single-Phase Power Theory Using Orthogonal Transformations
Dobrucky, Branislav - Roch, Marek - Hosny, Wada M.

Formato:	,
Enlaces:	The paper deals with the new method of power analysis of single-phase power electronic systems. Using a new particular transform theory the ordinary single-phase system can be transformed into equivalent two-axis orthogonal one. The new original thought is based on…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

32.

Modelling of Failure Effect to Integrity of System
Rastocny, Karol; University of Zilina

Formato:	,
Enlaces:	The interlocking systems are typically resisting against hazardous faults. Failure effect on the system can be determined directly by monitoring the original system installation, by simulation of the system operation using its model, or by computing or theoretical reasoning. The…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

33.

Hash Mechanisms Suitable for Transmission of Safety - Related Messages
Franekova, Maria; University of Zilina

Formato:	,
Enlaces:	The paper deal with problems of data security in the safety - related transmission systems defined within railway process. In details is analysed possibility od using hash-coding techniques, which are generally defined in norm EN 50159-2. According to specification of…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

34.

Examination of Level Crossings on ETCS Equipped Lines with Complex Simulation
Vincze, Bela - Tarnai, Geza

Formato:	,
Enlaces:	Because of the lack of former experiences with the new ETCS system, several experiments and tests have to be carried out with various technologies before any installation. For such a new system, it is also very important to have well…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

35.

Distribution of AC Contact Network Electric Field Strenght
Cherneva, Galina Petkova - Andonov, Antonio

Formato:	,
Enlaces:	To provide the stock electromagnetics compatibility is a serious problem with the contemporary development of the railway transport and implementation of lines for connection. The AS contact system is on of the main equipment of the electrify railway transport that…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

36.

Methodology Used to Create System Architecture for its in Slovakia
Janota, Ales - Zahradnik, Jiri

Formato:	,
Enlaces:	The paper deals with an object oriented approach proposed by the authors for creation of the ITS system architecture in the Slovak Republic and shows how a reference architecture can be created as s base for future more detailed architectures…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

37.

Solving of some Problems with On-Line Mode Measurement of Partial Discharges
Zalis, Karel

Formato:	,
Enlaces:	This paper deals with the problems discussing the transition from off-line diagnostic methods to on-line ones. Based on the experience with commercial partial discharge measuring equipment a new digital system for the evaluation of partial discharge measurement including software and…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

38.

Virtual Instruments for Detecting Rotor Faults in Induction Motors
Szabo, Lorand; Technical University of Cluj Napoca - Dobai, Jeno Barna - Biro, Karoly Agoston

Formato:	,
Enlaces:	Rotating electrical machines play an important role in the world´s industrial life. Hence there is a demand on their reliable and safe operation. Their faults and failures can lead to excessive downtimes and generate enormous costs in reduced output, emergency…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

39.

Study of High Temperature Insulation Materials
Mentlik, Vaclav - Kucerova, Eva - Bocek, Vaclav - Sebik, Pavel

Formato:	,
Enlaces:	One of current objectives of the electro insulating technology is the development of the material for extreme conditions. There is a need to operate some devices in extreme temperatures, for example the propulsion of the nuclear fuel bars. In these…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

40.

Analysis of Electromagnetics Forces on Magnetically Suspended High-Speed Trains
Mayer, Daniel - Jedlicka, Martin

Formato:	,
Enlaces:	High-speed superexpresses (HSST) developed by Japanese airlines (JAL) are based on the electrodynamics principle of magnetic suspension. The track contains short-circuited coils and interaction between them and superconductive coils in the vehicle produces its suspension. The paper includes a mathematical…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

41.

Modelling of Magnetic Field Shielding and Penetration into Superconducting Strips
Sumichrast, Lubomir - Mican, Marcel - Gomory, Fedor

Formato:	,
Enlaces:	The superconducting strips have the property of shielding the magnetic field from the interior of the superconducting conductor, i.e. the current distribution inside the superconducting strip is such as to minimise overall energy of the magnetic field inside the strip.…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

42.

Magnetic and Electric Properties of Magneto polymer Composites
Slama, Jozef - Papanova, Maria - Gruskova, Anna - Usakova, Marianna - Dosoudil, Rastislav

Formato:	,
Enlaces:	Permeability spectra of MnZn ferrite composite materials, prepared by mixing ferrite particles with PVC, have been studied. As the ferrite filler content decreases in composite, the quasistatic permeability of the rotation component decreases and relaxation and the resonance frequency shift…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

43.

Magnetic Non-destructive Testing of Plastically Deformed Mild Steel
Pala, Jozef - Bydzovsky, Jan - Smida, Tibor

Formato:	,
Enlaces:	The Barkhausen noise analysis and coercive field measurement have been used as magnetic non-destructive testing methods for plastically deformed high quality carbon steel specimens. The strain dependence of root mean square value and power spectrum of the Barkhausen noise and…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

44.

Transient Magnetic Field in a Conducting Cylinder
Piatek, Zygmunt

Formato:	,
Enlaces:	In the paper we determine the transient magnetic field in a conducting cylinder placed in external longitudinal sine-shaped magnetic field using the solution of Bessell equation in cylindrical co-ordinates, and also applying integral Laplace transformations, attenuation and diffusion of the…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

45.

Capacitive Coupling in Double-Circuit Transmission Lines
Benesova, Zdenka - Sroubova, Lenka

Formato:	,
Enlaces:	The paper describes an algorithm for calculation of capacitances and charges on conductors in systems with earth wires and in double-circuit overhead lines with respect to phase arrangement. A balanced voltage system is considered. A suitable transposition of individual conductors…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

46.

Comparison of Systems for Levitation Heating of Electrically Conductive Bodies
Dolezel, Ivo - Dvorak, Pavel - Mach, Martin - Ulrych, Bohus

Formato:	,
Enlaces:	Levitation heating of nonmagnetic electrically conductive bodies can be realized in various systems consisting of one of more inductors. The paper deals with compassion of the resultant. Lorentz lifts force acting on such a body (cylinder, sphere) and velocity of…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

47.

The Errors Caused by Test Site Configuration at the Radiated Emission Measurement
Bittera, Miki - Hallon, Josef - Kovac, Karol - Szolik, Imrich

Formato:	,
Enlaces:	Nowadays, it is very important to know and to keep uncertainty of EMC measurements at low value to ensure the comparability of measurement results from different laboratories. This paper deals with analysis of uncertainties caused by improper test site configuration…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

48.

Propagation of Microwaves Thought Atmospheric Environment
Kocifaj, Miroslav - Martincek, Ivan

Formato:	,
Enlaces:	Wireless microwave systems tend to have high availability figures, but at the expense of the ability to operate at higher data rates. A quality of free space communication depends on atmospheric conditions. It is shown that microwave attenuation reacts sensitively…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

49.

IF-Filters for Mobile Telephones
Nevesely, Miloslav

Formato:	,
Enlaces:	Intermediate frequency (IF) filters for channel selection in mobile phone systems must offer narrow bandwidths together with very steep skirts and excellent stop band rejection. Surface acoustic wave (SAW) filters fulfil these requirements. But if conventional transversal design techniques are…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

50.

Basic Principles and Utilization Possibilities’ of Ultrasonic Phased Array in Material Nondestructive Evaluation
Faktorova, Dagmar - Capova, Klara - Cap, Ivo

Formato:	,
Enlaces:	The paper deals with the basic principles of operation and with the utilization possibilities of phased array (PA) in materials nondestructive testing (NDT). The first part deals with description of PA arrangement modes, which enable to generate, focus and steer…
Fecha:	2011-07-07
Recurso:	Advances in Electrical and Electronic Engineering