Scintillations in tantalum capacitors are momentarily local breakdowns terminated by a self-healing, or conversion of the manganese oxide used as a cathode to a high-resistive mode. Similar breakdown events are often considered as nuisances, rather than failures. The author argues that a...

The paper presents signal to noise consideration of a new NDT method. Tested sample is excited by electrical and ultrasonic signals with different frequencies. On the defect new harmonic signal is created with frequency given by subtraction of exciting frequencies fE and fU. High&#...

The paper deals with the numerical modeling of voltage and current waveforms on transmission lines with nonlinear loads. It will be considered the linear transmission line only. The propagation of the voltage and current waveforms is solved numerically in the time domain. The new&#...

The paper presents design and simulation of the most important stage in pipelined analog-to-digital converter (ADC) so-called multiplying digital-to-analog converter (MDAC). The MDAC with 1,5 and 2,5 bit of resolution were designed using CMOS 0.7 μm technology. The both types of MDAC we...

High voltage varistors that consist of grained ZnO have to be tested before assembling. The recommended method for standard industrial testing of varistors demands application of high voltages and intensive currents that is inconvenient and needs extensive power consumption. This method requ...

In the paper main consideration is paid to investigation of inhomogenities in dielectric sample from the standpoint of their impedance properties and reflected signal amplitude. Such application include inspecting modern materials such as composites, detecting and characterizing surface and volume...

Up until now, the efficient and structured analysis of unknown CMOS integrated circuits (ICs) has become a topic of great relevance. In the last decade different invasive and non-invasive strategies have been developed to analyse unknown ICs. However, invasive procedures always lead to&...

The paper deals with methods for the solution of transient phenomena and sensitivities at semi-discrete models of multiconductor transmission lines (MTL). The models are formed by a cascade connection of generalized lumped-parameter Π networks, they can be fed in arbitrary nodes, nonzero...

In this project I deal with thermal comfort and radiant component conversion efficiency of high temperature and low temperature radiant panels. Then I deal with components, that influence thermal comfort and with heat transfer coefficient for varions possibilities of panel suspension.

This paper describes distribution of electric field intensity on insulator chain. The aim of thesis is to describe the benefit of capacity circle. Work is only theoretically. Output is in professional software. It is used for numerical solution of electromagnetic field – FEMM. They...

In this paper I focus on the metods of identification of the cylinder electromagnetic field over induction equipment according to its configuration – inductor, charge and shielding of the electromagnetic field. The results obtained by measuring of the model were verified by computer...

In this paper is described a short circuit current waveform, and more specifically, the fully-offset asymmetrical short circuit. This is the worst case short-circuit considered in the standards for metal-clad switchgear (ANSI/IEEE C37.20.2) and circuit breakers (ANSI/IEEE C37.04) as it ...

In this paper I deal with induction heating of the shrink-ring. First, I describe advantages of using induction heating in industrial applications. Then I write about concrete problem – heating of the shrink-ring. I determine conditions that are necessary to fulfil during the heati...

The article in paper describes used types of arresters in telecommunication network, evaluates their electrical parametres and functional features based on the measurement of a selected sample.

This paper contains very important facts about thermal analyses and degradation processes of electro-insulating materials. This area is a very important part of electrical engineering. Insulating material can be exposed to various kinds of stresses. By the help of thermal analyses we ca...

The investigation of environment influence onto each system is important discipline. The knowledge of environment influence on the properties of materials is important by reason of correct function of systems. Materials, which are used in electrical engineering such as insulating and constru...

The paper presents a description of theoretical solutions in the sphere of optimizing control of technological processes and subsequent analysis and application of the chosen control approach on the process. The basic notions and approaches associated with problems of processes optimizing an...

This work deals with problems of determination of parameters of induction machine's substitution diagram using finite element method software FEMM. There are determined parameters of subtitution diagram corresponding both with stator and rotor (leakage inductances and resistivities) and magnetizing...