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This article is devoted to increasing the energy efficiency of electric drives of installations of enterprises of housing and communal services, by justifying the use of systems of asynchronous and synchronous drives with frequency converters. It is shown that when throttling, the energy of the flow of a substance held back by a latch or valve does not perform any useful work. The method of solution...
The influence of errors in the signal model using the methods of estimating the spatial spectrum of the input field of the antenna array is investigated. It is shown that, in the presence of model errors, the eigenvectors of the matrix of the mutual power spectral density of the sum of the signals and noise in terms of their stability and resolving power can differ significantly from each other. The...
The results of a studying of autonomous hoppers of electricity based on batteries and supercapacitors are presented. Characteristics of different variants of equivalent circuits of electric power hopper devices were studied by modeling. The optimal operating modes of hybrid electric hoppers were established, as well as the identified parameters of the circuit elements such drives, in which the greatest...
The article describes the efficiency of solar modules in Europe, the comparative analysis of various alternative energy sources. The article details the solar power system on the basis of bilateral modules with the hydrogen generation system and its working principle and efficiency in various modes. The comparison of the performance of the proposed solar power systems on the basis of bilateral modules...
Methods of development of formal mathematical models and control methods of channels of transmission information. It is shown that the main methods of controlling the state of transmission channels are reduced to the total, and the separate divisional methods.
The effect of metrology on products testing, conformity assessment and quality systems is analyzed. The main fields of metrological activities having effect on the quality of products testing and used at testing laboratories are given.
This paper aims at the comparison of the network power for Pearson-Hamming networks built using the chi-squared functional set, and Bayes-Hamming networks built using the hyperbolic functional set. To configure these networks a correlation matrix of biometric data is calculated. At the nest step the data are sorted. Low-correlated data are converted with Pearson-Hamming networks, high-correlated data...
This article describes a method for the long-term testing of storage batteries and high-capacity ion sources, implemented using National Instruments technologies. A test stand was developed using DAQ NI USB-6001. A brief description of the program implemented in NI LabVIEW is given. The part of the program code is opened — the block diagram of correction of temperature coefficients. The interface...
The paper describes automated system for MIL-STD-1553 integrated circuits functional and parametric control based on National Instruments hardware and software. Automated measuring system block-scheme is presented. The paper discusses the process of ICs testing and software and hardware description.
This article is devoted to the use of a three-phase sinusoidal current to create a rotating magnetic field. In the article the following cases are considered and presented: 1) with three conductors located with a spatial shift of 120 degrees relative to each other; 2) with three windings located with a spatial shift of 120 degrees relative to each other; 3) with three conductors and windings, located...
This paper discusses implementation of method and tool for determining the signal-to-noise ratio on the input of spacecraft onboard receiver by means of counting spikes in the envelope of additive mixture between signal and narrow-band normal random process. The studies demonstrated feasibility of this signal-to-noise ratio evaluation method usage in satellite communications systems.
We present a number of exact solutions for general model of ferroelectric-dielectric bilayer capacitor with negative capacitance. Our model is based on the Landau-Ginzburg-Devonshire expression for free energy density of ferroelectric. Our solutions are suitable for real circuit design applications. We also discuss the transmission line filled by ferroelectric with negative capacitance.
This work presents a solution for radiation hardness grading procedure using compact X-ray facility built in probe station, with automated measurement system based on NI PXI platform. The radiation grading procedure can be integrated as additional stage to provide rad-hard option of conventional process. Using the radiation grading procedure as a stage of IC fabrication process, the total ionizing...
Effective mutual interference suppression methods are proposed for terrestrial ultra-wideband systems of mediumwave band. Navigation signals modulated with data provide higher accuracy, satellite and terrestrial systems integration. Such long range systems characterized by powerful mutual interferences.
Graphene synthesis technology on substrates is promising, as is compatible with existing CMOS-technology. Knowledge about how to affect the substrate of choice for structural and electronic properties of graphene is important and opens up new opportunities in targeted influence on the properties of this unique material. Specialized measuring system was established to measure the galvanomagnetic characteristics...
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