Bunin S.S., Dolzhenko D.O., Vysotskyy M.V., Plotnyk K.O.
Usage of Ultra Wideband Impulse Signals in Satellite Communication and Terrestrial Long-Distance
P. 5–10.
Fig. 2. Tabl. 2. Refs.: 8 titles.
Communication We consider the feasibility and evaluate the effectiveness of implementing the impulse radio ultra wideband signals (IR-UWB) for the long-distance communication. The communication channel with the Earth artificial satellite at an altitude of 700 km serves as an example. To reduce the absorption degree, we choose the atmosphere relative “transparency” window between 70–170 GHz so that the signal spectrum is limited by this band. We obtain the values of IR-UWB signal energy characteristics and compare them with those of the long-distance radar station. Finally, we show that the impulse ultra wideband signals can be used for the satellite as well as terrestrial long-distance communication.
Ivan’ko K.O., Ivanushkina N.G.
The detection method for atrial late potentials Based on eigenspaces Analysis of Ecg Wavelet Pattern
P. 11–18.
Fig. 7. Refs.: 7 titles.
We assume that mathematical orthogonal transformations can be applied to the problem of atrial late potentials (ALP) detection in the systems of high-resolution electrocardiography. Specifically, we propose an integrated approach to identify the low-amplitude high-frequency part of ECG with ALP using the wavelet transform to further separate it into a diagnostically important signal and noise by decomposition in the basis of eigenvectors. Crucially, we demonstrate the results of the conducted model experiment aimed at the ALP detection by employing the proposed method in the MATLAB system.
Naidenko V.I., Polegenka N.V., Postulga O.S.
Calculation of Electric Field Lines of Eigenwaves of the Open Comb
P. 19–23.
Fig. 6. Refs.: 11 titles.
Based on the numerical solution of the boundary problem, we design and build the electric field lines of eigenwaves of the open comb. Furthermore, our study suggests that the electric field distribution in the open comb is not as simple as usually portrayed.
Uryvsky L.О., Moshinska A.V., Prokopenko K.A.
The Modified Method of Efficiency Estimation for Information Transfer Systems
P. 24–29.
Fig. 4. Refs.: 5 titles.
The paper proposes the modified method of efficiency estimation for information transfer systems complementing the A.G. Zyuko’s well-known method. We introduce the new scale of information efficiency. In addition, we provide insights into the correct reflection of frequency, power and information efficiency indexes for the discrete and continuous transfer systems in an area, limited with the Shannon border. Moreover, we estimate the efficiency indexes at the requirements change to integrity of signal reception for different types of modulation.
Oliynyk S.Yu., Korniyenko A.V., Bun V.P., Lukianets K.I.
Optimal Data Filtration Based on Kalman’s Algorithm for Temperature Control of the Power Generating Unit Under Considerable Industrial Noise Influence
P. 30–35.
Fig. 6. Refs.: 8 titles.
In this paper, we utilize the Kalman’s filtration algorithm for processing the real data obtained from the temperature control system. This data consists of a complex combination of various noises. We prove that the Kalman’s filter satisfies the required filtration quality. Moreover, it can continuously process the data unlike traditional and previously used methods of programmatic filtration. Therefore, our method can be used by automatic control experts for data filtration of complex combination of noises in the field of heat power engineering.
Pysmennyy E.M., Epik E.Ya., Baranyuk O.V.
Structure of flow and heat exchange in Channels of heatsinkers at cuting of fins and their turns
P. 36–40.
Fig. 6. Refs.: 5 titles.
This paper highlights the research results of the flow structure (distributors of time-averaged velocities and their fluctuations) and heat exchange for the interfin half-open channels at the optimum depth of cutting (hp/h = 0,6) and the turn of cut parts of ribs on j = 10...30° angle. Moreover, we substantiate the direct correlation of heat exchange intensification and the growth of total flow disturbances of stream.
Rassamakin B.M., Khayrnasov S.M., Chornobay V.O., Tsyuk T.A.
Thermal Modeling of the Nanosatellite Developed at the National Technical University of Ukraine “Kyiv Polytechnic Institute”
P. 41–45.
Fig. 6. Tabl. 4. Refs.: 7 titles.
The paper under scrutiny demonstrates numerical simulation results of thermal modes of the nanosatellite developed at the National Technical University of Ukraine “Kyiv Polytechnic Institute”. It is designed to conduct scientific and applied research into the Earth remote sensing in the low Earth orbit with a solar pointing. In addition, we compare the obtained results with numerical simulation results of the “FalconSat-2” small satellite developed by the United States Air Force Academy.
Tregub V.G., Kunyk A.O.
using the OPC technology in the automation of thermal power station units
P. 46–51.
Fig. 3. Refs.: 14 titles.
The paper deals with implementing the OPC technology to increase the operation efficiency of the integrated ACS thermal power station units. We analyze the power generating unit as a technological control object. Specifically, we elaborate the concept of developing the integrated information system of the power generating unit as a part of the grid. We also propose the structure of the typical OPC server which can be used within this concept.
Maslyanko P.P., Zemlyansky Ju.R., Riabushenko A.V.
Forecasting System Engineering and Model of the System Financial Data Forecasting
P. 52–63.
Fig. 12. Refs.: 23 titles.
The paper proposes the model of system engineering of forecasting systems and engineering of a forecasting component for the control system of financial-investment activity. We develop a model of the system of the financial time series forecasting as well as describe a range of methods and algorithms which can be used for financial data forecasting. In addition, we implement the algorithms of models choice of financial data forecasting based on the statistical information for the financial-investment activity.
Romanuke V.V.
An elementary model of the active object search within partial indeterminancy in the form of a multistage diagonal 2x2 -game
P. 64–69.
Fig. 1. Refs.: 13 titles.
The paper proposes a model of the search domain of the active object with its elementary partitioning into rectangles. We develop the optimal searching model under the conditions of partially indeterminate probabilities of the object residence in the search domain. This model is based on the multistage diagonal 2x2 -game, whose matrix elements are determined through the player’s optimal behavior at the previous stage taking into account the reduction of maximal disbalance in evaluating the probabilistic data.
Khnygicheva А.M., Novikov O.M., Tymoshenko А.O.
On Modeling of Complex Information and Communications Systems Security Using the Logic-Probability Method
P. 70–77.
Fig. 4. Tabl. 3. Refs.: 17 titles.
This paper proposes the approach to modeling of complex information and communications systems security based on the logic-probability method. This approach relies on the component-specific division of the system’s security threats and their further integration into one complex security indicator. We also conduct the computing experiment to test the elaborated approach. The obtained results show that this approach allows simplifying the threats’ model formation as well as reducing expenditures on developing the information security system.
Veretilnyk T.I., Jachno O.M.
The Treatment Technology of sewages Using cavitation devices
P. 78–83.
Fig. 2. Tabl. 1. Refs.: 20 titles.
We analyze various treatment technologies of sewages. The focus is on our treatment technology of sewages using devices for generation of cavitations.
Kalinichenko P.M., Suprun O.V.
Axial Relief of the Centrifugal Pump Rotor by the Throttling Barrier
P. 84–89.
Fig. 2. Tabl. 1. Refs.: 7 titles.
This paper describes a novel construction of the equilibrating device with the enhanced reliability and performance, called the throttling barrier, for multistage centrifugal pumps. The application of the axial equilibration by the throttling barrier instead of the hydraulic balancing device, a bulky and unreliable unit of the axial relief of the pump spindle allows drastically increasing a net efficiency of the pump. Furthermore, we elaborate its calculation procedure and test it on a feed pump.
Kotlyarov V.P., Lavrinenkov E.O., Titarenko O.O., Aliverdi M.A.
The specificity of laser engraving of plastic produce
P. 90–97.
Fig. 5. Refs.: 9 titles.
This paper highlights the developed techniques of the surface engraving of thermosetting and thermoplastic plastics. Thermosetting plastics are processed by the printing method with the change of surface state of the detail parts within the picture boundaries. Thermoplastic plastics are engraved by the contour method but depending on the laser radiation type a contour line can be depicted as an evaporation track or a protuberant. The latter procedure can be of practical use for engraving letters and signs on the personal computer keyboard.
Makogon Yu.M., Pavlova O.P., Sidorenko S.I., Verbitska T.I., Beddis G.
Phase Transformation and Physical Properties of Nanodimensional Fe50Pt50 (30 nm) /SiO2(100 nm)/ Si(001) Film System
P. 98–102.
Fig. 7. Refs.: 5 titles.
In this paper, we study conditions of the magnetically ordered L10(FePt) phase with a face-centered tetragonal lattice in the nanodimensional Fe50Pt50 (30 nm)/SiO2(100 nm)/Si(001) film system at annealing in nitrogen. We also investigate its structure, morphology, electric and magnetic properties. On the experimental side, we show that the magnetically ordered L10(FePt) phase with rectangular grains is formed in Fe50Pt50 films after annealing at 720 K. Its formation during further annealings results in the increase of Fe50Pt50 film coercitivity up to 1000 Gs at the saturation magnetization of about 945 ems/cm2. The direction change of the applied magnetic field doesn’t cause any essential changes in the hysteresis loop form due to its isotropy.
Maslyuk V.А., Nezabytovsky D.G., Goncharyk О.I., Bilyk І.І.
The influence of annealing Temperature on the phase structure and physical and Technical properties of iron oxide powder Obtained by biochemical recycling of the metal scrap
P. 103–106.
Fig. 4. Refs.: 6 titles.
In this paper, we study the influence of annealing temperature on the phase composition and physical and technical properties of iron oxide powder obtained by biochemical utilization. We demonstrate that the greatest oxide yield of Fe2O3 trivalent iron from the interaction yield can be obtained at annealing temperature of 900 °С. Moreover, we prove that using microorganisms of Thіobacіllus Ferrooxіdans-type is promising for developing the high-efficiency green recycling methods of various scrap.
Skuratovskiy A.K., Yakhno M.M.
The Durability Improvement of Machines Components by ЖЧ25Х3 І ПС5ГШ-type Powder Composite Materials
P. 107–110.
Fig. 6. Tabl. 1. Refs.: 10 titles.
The core of this research is to study tribotechnical characteristics of powder composite materials under the conditions of chain couplings functioning. We recommend utilizing powder composite materials with a rough heterogeneous structure to produce complex shaped half-couplings toothings.
Stepanchuk A.M., Shevchuk M.B., Mazaev S.V.
On Properties and Obtaining of granules from refractory materials for producing composite Materials
P. 111–119.
Fig. 6. Tabl. 8. Refs.: 17 titles.
The paper determines the conditions of obtaining granules from refractory materials by granulation of their plasticized stock, atomization by a spinning electrode, melting in the low-temperature plasma by a consumable electrode, compaction followed by sintering and crushing.
Khyzhniak V.G., Arshuk M.V., Loskutova T.V., Peresenchyk T.L.
Titanium Aluminizing of the VK8 Nitrated Hard Alloy in the Enclosed Space
P. 120–124.
Fig. 2. Tabl. 1. Refs.: 15 titles.
We investigate the phase and chemical composition, structure, characteristics and operational properties of the VK8 nitrated hard alloy after diffused titanium aluminizing in the mixture of titanium and aluminium powders in the enclosed space. We demonstrate that the strength of films produced and covered with the VK8 nitrated hard alloy increases by several times at 12Х18Н9Т steel cutting as compared to the initial alloy strength.
Denysov M.O.
Clinical Apparatus for Photodynamic Diagnosis of Early Cancer
P. 125–129.
Fig. 2. Tabl. 2. Refs.: 17 titles.
In this paper, we investigate the technique for fluorescence diagnosis using the Ukrainian “Hyperflav” photosensitizer to differentiate healthy and affected sites of internal organs’ mucosa in the real time mode. It makes for providing an early treatment to prevent degeneration of these sites into oncological diseases.
Kuzmenko V.A., Marynina S.V.
The Algorithm of Determining the Source of Ionizing Radiation Location at the Study of the Object with a Difficult Geometry
P. 130–134.
Fig. 2. Refs.: 7 titles.
This paper considers the problem of detecting the specific place of the source of ionizing radiation (SIR) location when studying the object with a difficult geometry utilizing the system of dosimetria situation visualization. Specifically, we propose the verification method of the source orientation through а mathematical vehicle and develop the algorithm of determining the distance from а detector to the source.
Makeyenko I.L., Smirnov S.A., Sidorenko A.V.
Estimation of Subpixel Object’s Parameters Using the Digital Space Images
P. 135–140.
Fig. 6. Refs.: 9 titles.
In this paper, we study the method of center gravity for determining the characteristics of symmetric objects on digital images. Moreover, an estimate error is less than the size of one pixel (subpixel accuracy). We show that this method is not only more precise, but also more rapid than other methods. Specifically, the research results allow estimating an optimum size of the test objects for calibration of space scanners and parameters of defocusing for the star chambers of orientation sensors.
Melnik L.I., Volynets R.P., Budya D.О.
Structure, Physical and Chemical Properties of Natural and Reinforced Graphites
P. 141–146.
Fig. 3. Tabl. 3. Refs.: 6 titles.
We determine physical and chemical properties of materials tested as well as energy state of their surface. The results of complex physical and chemical analysis (infra-red-spectroscopy and derivatography) show that there are structural connections (С = С, Si–O–Si, С–Н) and functional groups (OН, С = О) in natural and reinforced graphite. Through the experiments conducted, we uncover the structural specificity of natural and reinforced graphites based on natural ones. Finally, our study suggests that there are substantial differences in the structure of natural and reinforced graphites that greatly influences their electro-physical properties, notably their specific electrical resistance.
Оvsienko О.L., Аlexeeva Т.М.
The Influence of Caesium Compounds on the Properties of the Low-Temperature Catalyst of Carbon Monoxide Converstion. Caesium Formiate Promotion
P. 147–151.
Fig. 1. Tabl. 2. Refs.: 11 titles.
This paper studies the influence of promoting admixtures of the Cs formiate on the catalyst activity, selectivity, stability, crystal structure and morphology of Cu-Zn-Al catalyst of low-temperature CO conversion. We test two methods of introducing the promoter, notably into the calcinated as well as into the carbonate catalyst mass. On the experimental side, we determine that Cs introduction in the amount of 1 % allows reducing the catalyst activity in a side reaction of methanol formation by 2–2,5 times. The Cs introduction into the carbonate mass yields better results than into the calcinated one. Since it results in reducing the formation of by-product methanol and gives a less negative action on the activity, thermostability, crystallinity, specific total surface and copper surface of the catalyst.
Chygyrynets’ O.E., Vorobyova V.I.
Research into Anticorrosion efficiency of vegetable extracts
P. 152–156.
Fig. 2. Tabl. 1. Refs.: 7 titles.
This study suggests the anticorrosion protection of extracts of various types of vegetable resources. It is a promising source for developing nontoxic corrosion inhibitors, including volatile ones. We show that compositions of volatile corrosion inhibitors based on the aliphatic amine, heterocyclic nitrogen containing сompounds, isopropanol vegetable extracts at their application both from a gas phase as well as by a pin method demonstrate better protective properties than the known nitrite of dicyclohexylamine. They also provide the anticorrosion protection of carbon steel under the conditions of periodic condensation of moisture. Crucially, the proposed compositions based on vegetable extracts are effective both in the initial and last stages of corrosion tests.