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  • Advanced Methods of Track Nanomembranes’ Producing

    Two technological processes are described: be using SDP and FEF. Both processes more economical than conventional.

    Keywords: Track Nanomembrane, New US patents

  • Development of new types of functional additives to lubricants to improve their tribological characteristics

    The article presents the results of the use of additives based on non-stoichiometric compounds Mo and W to improve railway greases LZ-CNII and CIATIM 201. In the course of the work, a comparative analysis of the thermophysical and tribological properties of these lubricants with additives was carried out. It was also established that the introduction of lubricants of this type of additives into the dispersion medium improves the tribological properties without deteriorating the performance parameters of these lubricants.

    Keywords: plastic lubricant, LZ-CNII, CIATIM 201, friction, wear resistance, lubricating film, antifriction additive, non-stoichiometric

  • Local atomic structure of gold nanoparticles in silica glasses by using to EXAFS and DFT modeling

    • Abstract

    Plasmonic nanoparticles make it possible to localize the electromagnetic field at scales smaller than the optical wavelength. This property is useful for the application of same objects for the creation of nanodetectors, in the processes of energy conversion and storage, in the tasks of data processing and transmission. In particular, the creation of computer chips with plasmonic elements instead of traditional semiconductors will increase their performance and energy efficiency. Our main purpose is obtaining implanted in the matrix of glass the arrays of plasmonic nanoparticles with controlled optical properties. Their properties can be varied by changing the conditions of their synthesis and post-processing. Nanoparticles are created by UV-laser influence on the gold film, precipitated on the glass surface. One of the proposed methods is long-term heating at 300 ̊C of already synthesized samples. This research presents the results of the study of the effect of temperature treatment on the atomic structure of Au nanoparticles. The study of the nanoparticles atomic structure was performed by using EXAFS-spectroscopy at the Au L3-edge. EXAFS-functions were fitted by using Stepwise EXAFS fitting-code, obtained models of the NPs atomic structure were confirmed by using DFT-optimization. The fact, that the atomic structure of NPs before and afted thermal treatment is strongly dependent of the thickness of initial gold layer (6, 10 and 70nm), is established. These differencies can be explainde by different interaction between gold film & NPs and glass matryx.

    Keywords: nanoparticles, Au, nanoplasmonics, EXAFS, DFT, atomic structure

  • Effect of oxide additives on the structural properties of the cobalt catalyst for the synthesis of hydrocarbons

    The structural properties of cobalt catalysts and their active component are studied. The influence of metal oxides on the specific surface area, pore volume and size, the average crystallite size and the active surface area of the catalyst Co-Al2O3/SiO2 was studied.

    Keywords: Fischer-Tropsch synthesis, synthetic hydrocarbons, catalyst, cobalt, promoter, carrier, specific surface, porous structure, catalytic activity, degree of reduction, active surface area

  • Solid-state synthesis of copper-containing zeolites: local atomic structure of catalytically active copper centers by means of XAS spectroscopy and DFT modeling

    Today, catalysts based on zeolites containing transition metal ions are being intensively developed, ensuring the selectivity of the reaction of direct oxidation of methane to methanol. In current work, the X-ray absorption spectroscopy complimented with the structural models obtained in frames of the density functional theory were used to study the dependence of the local atomic structure of copper centers in mordenite type zeolites synthesized by solid-phase ion exchange using CuCl and H-MOR, upon the annealing temperature at different stages of synthesis. The typical Cu – O interatomic distances and the corresponding coordination numbers are determined. The dependence of the fraction of copper ions on the zeolite on the annealing temperature was established.

    Keywords: EXAFS, DFT, zeolites, solid-phase synthesis, methanol synthesis

  • Effect of modification of aluminum oxide on cobalt catalyst of Fischer-Tropsch synthesis promoted by manganese oxide

    The physical and chemical properties of cobalt catalysts promoted by manganese oxides for the synthesis of hydrocarbons by the Fischer-Tropsch method are studied. The influence of polymorphic modifications of the alumina carrier on the specific surface area, pore volume, degree of reduction, size of cobalt crystallites,catalytic activity, dispersion degree of catalyst reduction is considered.

    Keywords: Synthesis of Fischer-Tropsch, synthetic hydrocarbons, the cobalt catalyst, promoter MnO2, the carrier of Al2O3, specific surface area, the degree of recovery of the catalytic activity, dispersion, and the crystallites of cobalt

  • Analysis of the probable phase composition of the active coating based on cobalt and manganese oxides

    It is found that a sufficiently high catalytic activity of the metal oxide electrode is due to the state of phase disordering of the coating surface due to the presence of highly dispersed spinel-like and rutile-like phases of solid solutions, as well as the nature of the distribution of these phases in the coating volume. The possibility of formation of disordered and partially ordered spinel-like phases of the form (Co,Mn)3-xO4 is analyzed

    Keywords: structural-phase disorder, solid solutions, spinalator phase retinopathy phase coating

  • Improving the performance and performance properties of coatings formed under vibration mechanochemical action

    The article presents an analysis of promising research on the formation of vibrational mechanochemical coatings from the point of view of practical use in the real sector of the economy

    Keywords: combined methods of treatment, vibration treatment, the vibration mechano-chemical (chemical-mechanical) coverage webrevolve technological system, mechanical coating, fragmentary nature, plastic deformation, uniform coating, vibrowave impact, microstructu

  • Investigation of variations of the electron concentration in the f-layer of the polar ionosphere due to the change of the sign of the By-component of the interplanetary magnetic field

    The study was conducted of the dynamics of large-scale structures of the polar region F2, due to the change of the sign of the By-component of the interplanetary magnetic field. It is shown that one of the reasons for non-stationary variations of the ionosphere structure in polar caps can be fast variations of the By-components of MMP. The time of transfer of the ionization language from morning to evening is 3000 s. This process is accompanied by the stratification of the ionization language and the formation of large-scale ionization spots that disintegrate over time.

    Keywords: polar ionosphere, convection, the electron concentration, interplanetary magnetic field, the helio-geophysical conditions, ionospheric disturbances, polar cap, By - component of MMP, the F-layer

  • Hydroacoustic system with complex signals for communication and positioning of underwater vehicles

    The method of local positioning of underwater vehicles by hydroacoustic system with linearly-frequency-modulated probing signals is considered. The method is based on measuring the range to the object and calculating the angles of arrival of echo signals on two or more spaced antennas. To increase energy and noise immunity signals with linear frequency modulation (LFM) are used. The scheme of towing an underwater vehicle with an acoustic beacon and the location of a hydroacoustic interferometer with two receiving antennas on a towing vessel are presented. The possibility of practical use of this method for high-precision measurement of the spatial position of an underwater towed or Autonomous vehicle relative to a surface vessel and, accordingly, the possibility of geographical reference of acoustic images and sea-bottom profilograms obtained by an underwater vehicle is experimentally shown. The results of full-scale tests of the experimental positioning system for its testing in the coastal zone of a small pond are presented. The block diagram of the local positioning equipment is presented. Examples of experimental distributions of the power module of echoes over the range are given for correlation processing of the acoustic beacon LFM signals. The paper also proposes the use of narrow-band traverse broadband parametric systems for communication between Autonomous unmanned underwater vehicles (ANPA) moving "in a flock". Describes the main specifications of the system and the experimentally measured in hydroacoustic basin of the directivity pattern of the antenna at the average rate of pumping and difference frequencies. The features of signal propagation in shallow sea are presented.

    Keywords: hydroacoustic systems, side-view interferometric sonar, local positioning systems, parametric antenna, data transmission system, broadband antenna

  • Electrodeposition of a dispersed alloy of iron-nickel in stationary and non-stationary electric modes

    The process of electrodeposition of the iron-nickel alloy in stationary and non-stationary electric modes is studied. The influence of periodic currents of various forms and parameters on the rate of extraction of the alloy components, its composition, and also the current efficiency of the alloy is investigated.

    Keywords: iron-nickel alloy, current density, current efficiency

  • Cathodic processes in intergranular corrosion of nickel-chrome stainless steel

    The nature of cathodic reactions occurring during intergranular corrosion (ICC) on stainless steel 08X18H10T in a solution of 0.5 M H2SO4 + 0.01 M KCNS is considered. Evaluation of the thermodynamic potential of various reactions with components of the solution showed that the ICC process in this system proceeds with mixed oxygen-hydrogen depolarization. When the temperature rises, an intensification of the cathode process occurs, which is associated with a decrease in the overvoltage of the reduction of oxidants. Forced medium movement at low temperatures also facilitates the cathodic process, and at elevated temperatures the effect of convective medium movement decreases. This is due to the decrease in the proportion of oxygen involved in the cathode process, since its concentration in solution increases with increasing temperature.

    Keywords: intergranular corrosion, stainless steel, temperature and hydrodynamic conditions

  • The possspillity of use of eddy current method of non-destructive testing to find a hidden weld with wildcat changes in the integrity of the vehicle structure

    This article describes the control of the weld with illegal changes in the integrity of the design of motor vehicles, eddy current method of non-destructive testing. Description of the method and mathematical model. Experimental data are illustrated in tables and graphs. As well as the rationale for the effectiveness of this method.

    Keywords: non-destructive inspection method, a weld, a motor vehicle, the frequency, the defect, the integrity of the design

  • To an issue of expansion of area of accreditation of laboratory on ensuring unity of measurements

    In today's market economy, a large number of organizations engaged in the provision of services aimed at verification of various measuring instruments, such as water meters, gas meters, electricity meters and others. For such companies, it is of interest to expand the scope of accreditation, which will significantly expand the range of services provided. The article presents the algorithm of the procedure for expanding the scope of accreditation with a description of the main stages.

    Keywords: verification of measuring instruments, accreditation scope

  • Features of technical risk assessment under non-deterministic stochastic parameters

    The quantitative methods of risk assessment of technological processes of manufacture and the analysis of level of deficiency of products in the conditions of nondeterministic stochastic parameters are considered. The properties defining reliability of process are its controllability, stability and reproducibility. The main methodical device by assessment and the analysis of these properties are provisions of standards on statistical methods of quality control. In the analysis and assessment of risk it is necessary to consider that borders of a tolerance zone of parameters of products and control limits of reliability of technological processes of its production are always considered as acceptable (admissible) risk levels. Overcoming these levels is considered a negative consequence in the form of increase in level of deficiency of products and decrease in accuracy of technological processes of its production. Technical solutions are always bound to risk as it is never impossible to be sure of the end estimated result in advance. To check whether this risk was justified, it is possible always only after realization of technical solution and approach of an undesirable event. Therefore technical activity in principle can't be completely free from any risk, and it is always necessary to go on necessary and justified risk consciously.

    Keywords: technical system, technological process, risk, indeterminacy, management of reliability, negative event, damage, nondeterministic stochastic parameter

  • Device for determining the dynamic and static coefficients of bulk products

    The article presents a description of the device for determining the physicomechanical characteristics of bulk materials - coefficients of external and internal friction. In DSTU, a device for determining the friction characteristics of bulk materials was designed and manufactured. A method for determining the coefficients of static and dynamic friction is presented. The proposed device allows to obtain more accurate information about the frictional characteristics of one or different bulk materials in static and dynamic conditions.

    Keywords: Friction, dynamic coefficient of friction, static coefficient of friction, bulk material

  • Current regulation active harmonic distortion filter

    The article provides one of the possible ways to increase the efficiency of a device for suppressing harmonic distortions of a current of a power line by introducing a difference signal into the feedback loop proportional to the deviation of the voltage of the power line from a reference value. A simulation model of a power system with a device for suppressing harmonic current distortions has been developed, which makes it possible to evaluate the effectiveness of the active filter for various parameters of the feedback loop. The oscillograms of currents in power lines are shown when a harmonic distortion device is connected. The results of the harmonic analysis of the voltage of the power line, showing a decrease in the level of voltage distortion when the active filter is connected to the power line, are presented.

    Keywords: current harmonic distortion, power line, simulation, active filter, Matlab / Simulink, nonlinear load, feedback, dynamic properties

  • The use of non-destructive testing devices in the judicial construction and technical expert examination

    The article considers the issue of relevance of non-destructive testing, as well as some features of the use of non-destructive testing devices in the judicial construction and technical expert examination. Conducting construction and technical expert examination is impossible without accurate measurements, which attaches conditions for the use of various methods, technologies, devices and tools. Among them, one should separately distinguish a group of non-destructive testing devices that allow measuring facilities of research without damage and simultaneous obtaining of reliable features of parameters determining the technical condition of the facilities being examined.

    Keywords: judicial construction and technical expert examination, expert, non-destructive testing, non-destructive testing methods, non-destructive testing devices

  • Thermal Image Histogram Processing Methods

    The article presents the implementation results of the methods of linear contrasting, image histogram equalization, adaptive histogram equalization (AHE) and contrast limited adaptive histogram equalization (CLAHE) as test software for thermal image processing. It also proposes some ways of enhancement of the CLAHE method that eliminate the necessity to manually select the parameters to be changed.

    Keywords: image processing, computer processing, histogram processing, histogram equalization

  • Methodological study of artistic design automatic capture of tubular products

    The article describes the methodological rationale and organization of the process of artistic design when creating an automated capture of pipe products. Show examples of constructive solutions of separate elements of capture.

    Keywords: automatic capture, trumpet, artistic and design, methodology, rationale, option, shapes hook design

  • System perception and transfer of images printing symbols with the original in the matrix of the memorable device of the personal computer, defining types of symbols

    The authors have developed a device consisting of a system of perception of images of printed characters and a personal computer (PC), which determines the types of characters. According to the program developed by the authors, the PC contours the image of the printed symbol in a rectangular matrix consisting of the cells of the PC's storage device. As a result of the edging of the shape of the printed symbol, essential and necessary signs were determined - the directions of the elements of the shape of the symbol, according to which, using the developed algorithm, the PC determined the type of this symbol relative to others. The perception system includes a small-sized television tube - a vidicon with a generator of sweeps of a vidicon beam on its screen vertically and horizontally, two channels and a coincidence circuit. The developed system of perception is distinguished by: simplicity of design, compactness, efficiency.

    Keywords: direction, perception system, trigger, amplifier, pulse counter, coincidence circuit

  • Experimental research of the intermediate frequency amplifier

    An experimental study of the intermediate frequency amplifier with a bandwidth of 25 to 155 MHz and a gain of about 40 dB was conducted. Given the functional diagram and one cascade of the concept. There is a brief description of the design. The experimental technique is described. The results of the experiment are given: two amplitude-frequency characteristics and one amplitude.

    Keywords: intermediate frequency amplifier, experiment, amplitude-frequency characteristics, dynamic range, compression point

  • Models of micromovements causing a turboprop effect

    An analysis of micromovements causing a turboprop effect or a micro-Doppler was carried out, analysis of model input data for building a function bank was performed, an algorithm for reducing the effect of a turboprop effect was considered, the expediency of forming a similarity function for the subsequent reduction of the effect of micromotion on an object

    Keywords: spectrum; radar; echo signal; turboprop effect; gliding component, micro-Doppler, radar

  • Experimental study of the passage detector

    The scheme and design of the detector operating in the range of operating frequencies from at least 1 to 1250 MHz are described. An experimental study of the frequency dependence of the voltage sensitivity B_u, as well as the amplitude characteristic at four frequencies. It is shown that the detector has a high frequency response uniformity and can be used in measuring and receiving-transmitting equipment.

    Keywords: the entrance detector, the voltage sensitivity, the amplitude, the unevenness of sensitivity on the voltage

  • Technical science. Informatics, computer facilities and management