The paper presents research results of electrokinetic zeta potential that exists in the electrical double layer on the border of the solid and liquid phases. For zeta potential examination, samples in the colloid form...
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The paper presents research results of electrokinetic zeta potential that exists in the electrical double layer on the border of the solid and liquid phases. For zeta potential examination, samples in the colloid form were used, the continuous (dispersing) phase of which was constituted by dielectric liquid mixtures formed on the base of simple hydrocarbons (hexane, cyclohexane, toluene), and the solid (dispersed) phase was constituted by materials in a disintegrated form (aluminum, copper, steatite, Al-70). The measurements were taken with Zetasizer 2000 - by Malvern Instruments (UK). Volume density of charge qw on the border of the solid and liquid phases, responsible for generation of electrostatic charges, was determined based on the measured zeta potential and physicochemical properties of the liquids under study.
The paper will present the wavelet analysis results using continuous and discrete wavelet transforms of vibrations of a power transformer tub installed on the block of a conventional, thermal condensation power statio...
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ISBN:
(纸本)9781627480000
The paper will present the wavelet analysis results using continuous and discrete wavelet transforms of vibrations of a power transformer tub installed on the block of a conventional, thermal condensation power station. The research tests were carried out during a regular transformer operation in industrial conditions. The measurements were taken from the point of view of the evaluation of the influence of the vibrations registered on the analysis results of the acoustic emission signals generated by partial discharges that can occur in paper-oil insulation systems of power transformers. Moreover, the analyses carried out were supplemented with the research results obtained in laboratory conditions during the measurements taken in the high-voltage testing station of high-voltage power appliances. The influence of the loosened screws fastening the lid of the transformer tub on the time-frequency analysis results obtained of the vibrations registered was investigated. Moreover, the range of the research work carried out referred to the evaluation of the influence of the changes of the pressure force of the metal plates forming the transformer core on the vibration measurement results were obtained. In summary, the evaluation of usefulness was presented and the range of the time-frequency analysis application possibilities, and especially wavelet transforms, in diagnostics of power transformers using the acoustic methods was characterized.
In this paper are presented some new concepts of control applied in Power Systems. Are given the architectures and methodologies based on the agents theory. The complexity of Power Systems is included into a new parad...
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In this paper are presented some new concepts of control applied in Power Systems. Are given the architectures and methodologies based on the agents theory. The complexity of Power Systems is included into a new paradigm – Complex Adaptive Systems – and the modelling and control of Power Systems based on intelligent agents are considered. Some concepts on hierarchical and heterarchical architectures which include different intelligent techniques are also presented in this paper.
In the world of control the enormous difficulties encountered in reaching satisfactory results with the design and implementation of controllers for Multi-Input/Multi-Output (MIMO) processes are well known, in particu...
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In this paper we present the results of object recognition using Mexican Hat wavelet descriptors. These descriptors are derived from the continuous wavelet transformation using the Mexican Hat function as mother wavel...
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This paper describes a new method for the computation of paths for mobile robots in a known working area. The desired path connects a given starting position to a target position under avoidance of static obstacles. P...
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We have proposed an algorithm for optimal real-time routing in multi-hop communication networks for multisource/multi-sink connection. The algorithm deals with various capacity constraints in terms of communication li...
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The paper treats a simple SISO control tool that uses classical nonlinear controllers. Description of basic functions and programs and several examples of their use comprise the main part of the paper. The tool forms ...
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The paper treats a simple SISO control tool that uses classical nonlinear controllers. Description of basic functions and programs and several examples of their use comprise the main part of the paper. The tool forms part of bigger system programmed in C++ and C# for industrial use. The MATLAB ® models of the control software and controller adjustment algorithms are freely available on the Czech Technical University web pages.
The paper describes a software package based on Maple computer algebra system that implements so-called generalized transfer functions. These have been re-discovered recently as a new way of representing nonlinear con...
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Biomedical engineering is a relatively new interdisciplinary science. This paper presents the biomedical engineering activity, which is carried out at Budapest University of Technology and Economics and its partner in...
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Biomedical engineering is a relatively new interdisciplinary science. This paper presents the biomedical engineering activity, which is carried out at Budapest University of Technology and Economics and its partner institutes. In the first part the main goals and the curriculum of the Biomedical engineering Education Program (BMEEP) is presented. The second part of the paper summarizes the most important biomedical engineering researches carried out mostly in the Biomedical engineering Laboratory of our university.
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