Analysis and control of electromechanical dynamic systems that can be described by Euler Lagrange equations. Property of Passivity.
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Microwaves
Koulouridis Stavros - Undergraduate -
(A-)
Microwaves, University of Patras
Transmission Lines: Homogeneous line equations. Parameters of homogeneous line. Transmission line attributes. Standing waves. Propagation constant and propagation velocity. Circuit analysis of transmission line. Characteristic and complex impedance of transmission line. Load matching in transmission line with quarter wave transformers, single or double stubs. Special type transmission lines, Graphical representation of reflection coefficient-Smith chart. Coupled transmission lines analysis. Balance and Non-Balanced transmission line. Crosstalk in long and short lines, Crosstalk in crossed lines and amplified lines. Line balancing. Transmission line types (two-wire, coaxial, stripline, slotline, coplanar lines) Waveguides Guided waves and guided modes. Separation of variables method. Wave equation solution. Field components. TEM, TE και ΤΜ modes. Parallel plates waveguide. Propagation condition. Rectangular and circular waveguide. Excitation of waveguides. Propagation velocity, characteristic impedance. Loss. Electromagnetic cavities. Dielectric waveguides. Fiber optics.
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Power Dividers and directional couplers. Multiport microwave elements, Magic T, Microstric cicrcuits.Active microwave circuits: detectors. Ferrite. Microwave filters
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Electric Motor Drive Systems
Epaminondas Mitronikas - Undergraduate -
(A-)
Department of Electrical and Computer Engineering, University of Patras
The purpose of the electric motor drive systems, their construction, the operation of the system motor-work machine, stability, torque of inertia, transient operation, the selection of the electric motors, losses and heating problems, operation behaviour and control, block diagrams and transfer functions, power electronic converters for controllable supply of electrical motors, automation. Special types of motors, very low power motors, applications.
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SPEECH TECHNOLOGY
Nikos Fakotakis - Undergraduate -
(A-)
Electrical and Computer Engineering, University of Patras
Models of human speech production and perception. Preprocessing of the speech signal. Acoustic parameters. Time domain speech coding. Frequency domain speech coding. Artificial neural networks. Speech recognition systems. Speaker recognition systems. Speech synthesis. Applications.
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1) Introduction to Power Electronics
a) Power electronics converters topologies, power electronics semiconductor devices (Power diode, Thyristor, GTO Thyristor, Power MOSFET, IGBT etc.), protection and cooling of devices.
b) Analysis of static as well as dymanic performance of thyristors, firing angle control circuit of thyristor.
2) AC-AC Converters (AC Voltage Regulators)
a) Single phase converter with antiparallel thyristors (TRIAC), extraction of voltage and current waveforms, firing angle limits, soft starters.
b) Three phase converter with antiparallel thyristor, extraction of voltage and current waveforms, soft starters, Speed control of induction motors.
c) Active, Reactive and Apparent power, Power Factor definition.
3) AC-DC Converters (Rectifiers)
a) Single phase rectifier with one thyristor, smoothing inductors and capacitors, extraction of voltage and current waveforms, active, reactive and apparent input power, power factor, harmonics.
b) Single phase rectifier with two thyristors and center tapped transformer, smoothing inductors and capacitors, extraction of voltage and current waveforms, active, reactive and apparent input power, power factor, harmonics.
c) Single phase rectifier with four thyristors (full bridge), smoothing inductors and capacitors, extraction of voltage and current waveforms, active, reactive and apparent input power, power factor, harmonics, commutation phenomenon.
d) Three phase Three pulse thyristor rectifier, smoothing inductor, extraction of voltage and current waveforms, active, reactive and apparent input power, power factor, harmonics, commutation phenomenon.
e) Three phase Six pulse thyristor rectifier, smoothing inductor, extraction of voltage and current waveforms, active, reactive and apparent input power, power factor, harmonics, commutation phenomenon.
f) Speed and Torque control of DC Machines.
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Teletraffic Theory
MICHAEL LOGOTHETIS - Undergraduate -
(A-)
ELECTRICAL AND COMPUTER ENGINEERING, University of Patras
The Teletraffic Theory is a branch of applied mathematics and particularly of applied probability theory. In literature, you will meet it with various names, such as congestion theory, the theory of stochastic service systems, queuing theory, and theory of mass service. Also, objects of the Teletraffic Theory are considered by the science of Operations Research. The term Teletraffic Theory is used for the theories (analytical models) of the traffic of communications systems, starting with telephone systems and extends to Internet systems, wireless networks or next generation networks.
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This course deals with all that material that is necessary to create the model of an electric power system from the composition of models of individual components. As a consequence, the behavior of the system in the permanent mode can be estimated. During the development of models of the various components necessary information about the system mode are given.
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Differenetial Equations
Michail Markakis - Undergraduate -
(A-)
Electrical and Computer Engineering, University of Patras
Basic applications from the theory of ordinary differential equations are presented throughout this course. These can help the students of the Department understand and use the tools and methods encountered in this very important field of Applied Mathematics.
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SIGNAL & SYSTEMS II
ATHANASSIOS SKODRAS - Undergraduate -
(A-)
ELECTRICAL AND COMPUTER ENGINEERING, University of Patras
The main emphasis of the course is the discrete-time signals and systems (sampling, convolution, Fourier transforms discrete time -DTFT, DFT, FFT-), and the stochastic signals.
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