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For the model of three-phase four-wire power supply system in an unbalanced non-sinusoidal periodic mode, which takes into account the energy losses in the active resistance of a power cable, the physical meaning of the presented formula for apparent power definition is analyzed. The conditions of its equivalence with the formulas given in the IEEE and European standards are defined. Based on the...
This paper describes the application of regularities of power-law distribution in form of its modification — technical cenosis approach which allows to provide the efficient functioning of capacitor banks in systems of electrical technology and to improve the efficiency of these systems. The application of the additional technical cenosis criterion allows the obtaining of the practical solutions in...
Developed concept of efficiency of heat electromechanical polyfunctional complex on the basis of the electromechanical converter and the heat source with a combustion chamber, which performs the process steps of drying, torrefication, dispersion, electromagnetic treatment, the screw compression biomass or industrial waste. The structure of high-performance heat electromechanical complex, which includes...
In this paper was proposed a capacitive sensor with coplanar parallel electrodes for measure the air gap between the stator and rotor in the hydrogenerators. The effects of influence of some technological errors on accuracy of measurement purposed capacitive air gap sensor has been analyzed. The design scheme and analytical dependences for the error identification because of inclination of sensor...
The paper presents milestones of researches dedicated to determination of physics of low-temperature distributed gas-discharge plasma of the glow discharge with hollow cathode and its application in technological processes of welding and soldering since 1916. It is demonstrated that powerful-current glow discharge is the perspective and competitive energy source in the processes of joining materials...
In the paper the problems of modeling and investigating the behavior of complex socio-economic systems are considered. Authors are deeply concerned about decision-making support issues in the case of evaluation for such complex socio-economic systems. To solve these problems, the totality of the development goals of the object and the priorities of these goals are determined, then the indicators are...
The problem of group decision making performed during selection of the best solution from possible alternatives in expert systems set was solved. The problem solution based on the integrated method, which consists of individual and group evaluation, increases quality of decision-making during expert evaluation process. The improved method of extraction and formalization of individual expert evaluations...
The rapid growth in the number of cancer patients in the last decade has become a real challenge for modern medicine. At first, it is due to the fact that in most instances the effective treatment is possible only in the early stages of the disease. Modern medical diagnostic methods which allow to carry out earlier and pre-clinical diagnostic is usually invasive, costly, not always safe for the patient,...
In this paper we consider the problem of taking into account the Earth curvature for the tasks of studying the influence of electromagnetic waves interference on target detection performance. A new numerical method of interference factor calculation for specified coordinates is proposed. Figures that show dependence of magnitude of interference factor on range and target altitude for VHF and X-band...
A system to control the data flow between detector sensors input streams for the data connected with a single event is elaborated. Obtained results show that a High Performance Computing cluster data exchange can be efficient AND fault-tolerant.
An accurate parameter estimation becomes one of most important goals of modern battery management systems in electrical vehicles and smart grids. Actually, only state of the charge is used to analyse the battery conditions. However, information about internal resistance and capacity as well as open circuit voltage allows optimizing the battery operation mode either while charging or discharging and...
The proposed integrated system is based on the methodology and strategy of solving the problem of guaranteed safety and survivability of complex technical object (CTO) functioning, that ensures the timely decision regarding the change of object's operation mode, providing the capacity for manual correction of a set of parameters with the purpose of returning their values to a normal mode. The advantage...
Development of automatic speech recognition (ASR) systems robust to late reverberation action is urgent task. It is well known that a late reverberation reduction algorithm used as ASR pre-processor demands prior estimation of reverberation time. Blind reverberation time measurements are less accurate than ones for known room impulse response (RIR) direct measurements. As result, it is naturally expect...
In this paper, the results of quality and intelligibility assessment of speech masked by stationary and nonstationary noise have been proposed. Subjective speech quality assessment technique has been used to show that white noise masking ability is lower than one for pink and even for brown noise when SNR is less than 0 dB. Two algorithms of nonstationary noise forming have been proposed. They are...
The use of asynchronous cellular automata models to remove noise from images is considered in the article. The use of cellular automata allows to simplify calculations, eliminating floating point operations, and enable parallel processing of image points.
The article describes the method of determining the boundary concentrations of dissolved gases in oil, providing at least possible economic damage in the event of erroneous decisions. A comparative analysis of the average risk of the values, which are accompanied by the use of the boundary values of gas concentration, regulated well-known international and national standards.
A radiation field of a radially oriented dipole located on a sphere was studied using an electric Green's function for the space outside of an impedance sphere. The directivity of the spherical antenna in wave zone was determined depending upon variations of the sphere diffraction radius and reactive impedance magnitudes.
This paper presents a novel field control algorithm for induction motor (IM) in the field oriented vector control (FOC) system in pause of intermittent duty using Euler's optimization equation for the copper losses minimization. The comparison of optimal demagnetization process with this one that is achieved by breaking the stator circuit is carried out. The analytical expressions for the losses values...
Nation aging raises a problem of elderly health care and this problem will only grow stronger next decades. Preventive and remote care for seniors come to the fore as the solution to lower the number of potential patients in clinics and to reduce the cost of medication in case of accidents by providing first aid in time. Human fall is a source of danger in any age and, especially for older people...
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