Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Volodymyr POHREBENNYK"

Role of Ionic Transport in the Electrochemical Activation of Water Solutions

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The change in electrical conductivity of water solutions during electrochemical activation in a stationary diaphragm cell was studied. It is shown that the chemical composition of solutions and processing time have an important influence on the activation process. Method of operational control of the electrochemical activation process based on an analysis of the value of the current passing through the cell at a constant voltage on the electrodes was proposed. Streszczenie. Zbadano zmianę przewodności elektrycznej wodnych roztworów podczas elektrochemicznej aktywacji w stacjonarnym diafragmowym elektrolizerze. Pokazano, że przy aktywacji ważną rolę odgrywa początkowy skład roztworu i trwałość procesu aktywacji. Zaproponowano metodę kontroli procesu elektrochemicznej aktywacji na podstawie analizy wielkości prądu, który przepływa przez elektrolizer, przy stałym napięciu na jego elektrodach. Rola transportu jonów podczas elektrochemicznej aktywacji roztworόw wodnych Keywords: water, conductivity, electrochemical activation. Słowa kluczowe: woda, konduktywnośc, elektrochemiczna aktywacja. Introduction Significant growth rates of environmental pollution require decisive and systematic public action towards the implementation of "green" technologies and protection of people against the negative factors. Over the last thirty years, scientists have developed, patented and implemented in production a lot of devices that are based on the method of electrochemical activation (ECA) of water solutions. Under the ECA process of water solutions is understood the process of transferring them to a metastable state caused by structure-energy and electrochemical changes in the electric field, which resulted in solutions for a period of relaxation show anomalous properties in the physical and chemical transformations. ECA is carried out in dilute solutions (generally at a concentration less than 0.01 M) at a high value of the external polarizing[...]

Synthesis and Optimization of Neural Network Parameters for Control of Non-linear Objects DOI:10.12915/pe.2014.05.047

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The possibility of using artificial neural network (ANN) for the construction of precise control of dynamic objects with variable parameters is considered. Approach to the synthesis of topology and learning algorithm based on recurrent Elman’s ANN with auxiliary feedback is suggested. The results of modeling of ANN operation in the system of control guided by large-sized antennas are given. Streszczenie. Opisano możliwość wykorzystania sztucznej sieci neuronowej (SSN) do precyzyjnego sterowania dynamicznych obiektów o zmiennych parametrach. Przedstawiono syntezę topologii i uczenia algorytmu opartego na SSN Elmana z dodatkowych informacji. Zaprezentowano wyniki modelowania SSN do zarządzania systemem pozycjonowania dużych anten. Synteza i optymalizacja parametrów sieci neuronowych do sterowania nieliniowych obiektów Keywords: antenna's rotating device, neural network, Hexapod, pointing error. Słowa kluczowe: Antena obrotowa, sieci neuronowe, Hexapod doi:10.12915/pe.2014.05.47 Introduction Precise control of complex dynamic objects often associated with technical difficulties of determining the number of real objects parameters that may change due to various factors. In such systems it is difficult to achieve the control with optimal parameter regulator settings constructed by classical methods, e.g., PID control to achieve the desired precision value in all possible ranges. Mathematical apparatus synthesis of control systems often is very complicated for complex mechanical systems with dynamic multidimensional interrelated nodes. The control parameters are often selected by trail-and-error approach. There are many methods and algorithms of self adjustment for PID controllers but the results of them lead to significant complication of algebraic computation with the introduction of many new parameters of the system [1]. An alternative to the classical methods of the control could be the mathematical apparatus of artificial [...]

Impedance investigation of activated carbon material modified by ultrasound treatment DOI:10.15199/48.2018.05.33

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The electrochemical capacitor with an electric double layer (EDL), or supercapacitor is a relatively new class of devices to store the electrical energy, which by its parameters and functional capabilities is between the traditional primary and secondary power sources and electrostatic capacitors. The prefix “super" indicates that these devices have higher capacitance by several orders than conventional capacitors of the same dimensions and larger specific energy. Compared with traditional batteries, supercapacitors have higher power density, although they lose them in energy density [1]. Such features allow using the supercapacitors in engines of hybrid vehicle, into the systems of improving the quality of electrical energy, when starting the internal combustion engines in all weather conditions, in the systems of volatile memory, etc [2-4]. Activated carbon materials are the most common materials for the supercapacitor electrodes manufacturing both with aqueous and non-aqueous electrolyte. This is due to well-developed porous structure of activated carbon, good electrical conductivity, environmental friendliness and low cost. However, traditional methods of activated carbon production do not supply the high quality electrode material. Therefore, the methods of modification of the raw materials [5, 6] or as produced carbon materials become of great importance in technological processes [7]. Various acids and heat treatments in inert atmospheres are often used for modifications. This processing substantially changes the porous structure and surface groups. However, such modification techniques are energy-intensive and environmentally hazardous. As an alternative to them the nonchemical methods of influence on the activated carbon can be used, among which an important place belongs to ultrasonic technologies [8]. The results given in [8], are related to the research of changes in the composition of the activated carbo[...]

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