Browsing 2020 by Title

Now showing items 1-20 of 32

    • About Possibility of Remote Diagnostics of the Respiratory System by Auscultation 

      Zaitseva, E. G.; Chernetsky, M. V.; Shevel, N. A. (БНТУ, 2020)
      Development of technical base, software, accumulated information on the diagnosis of the respiratory system provided the prerequisites for creating remote diagnostics of the human respiratory system through auscultation. The known methods do not solve the problem of determining auscultation points at patent´s housing without a diagnostic specialist. The purpose of this study is ...
      2020-06-30

    • Afocal Mirror Systems with Small Axial Dimensions 

      Artioukhina, N. K.; Peroza, L. (БНТУ, 2020)
      The searching and designing new solutions for mirror systems, including afocal ones, has been studied for decades. In the design, it has always been difficult to combine optimization and cost. Nowadays, the problem remains relevant. The widespread use of mirror systems is due to some aspects: thermal stability, high resolution in a wide spectral range, and the absence of image ...
      2020-03-16

    • Analysis of Requirements and the Feasible Limit for Error Reduction in Two-Parameter Magnetic Determination of Steels’ Hardness 

      Sandomirski, S. G. (БНТУ, 2020)
      All measurements of mechanical properties of materials in the magnetic structural analysis are indirect and relationships between the measured parameters are correlated. An important physical parameter of steel is hardness. An increase in the correlation coefficient R and a reduction in the standard deviation (SD) are achieved when controlling the hardness of steels with two-parameter ...
      2020-09-18

    • Application of the Correlation Velocity Measurements for Hydrodynamic Investigations of Turbulent Coolant Flow in Nuclear Reactor Elements 

      Konovalov, I. A.; Khrobostov, A. E.; Legchanov, M. A.; Solncev, D. N.; Barinov, A. A.; Ryazanov, A. V.; Chesnokov, A. A.; Makarov, M. A. (БНТУ, 2020)
      The method of correlation measurement of the coolant flow rate, widely used for operational diagnostics of nuclear power plants, can be extensively used in research practice. The aim of this work was to apply a correlation method based on the conductometric measurement system with wire-mesh sensors for measuring a coolant flow rate. Insignificant concentration of a salt solution ...
      2020-09-18

    • Application of Two-Channel Principle in Measuring Devices to Compensate for Disturbing Influences of Unknown Physical Nature 

      Nesterov, V. N.; Li, A. R. (БНТУ, 2020)
      The article notes the advantages of the method of constructing absolutely invariant measuring transducers for working in conditions with disturbing influences. However, this method is not universal. Its limitations are due to the impossibility of "symmetric" transmission of all disturbing influences into parallel measuring channels. A broader interpretation of the two-channel ...
      2020-09-18

    • Assessment of Temperature Effects in Interior Orientation Parameters Calibration of Optoelectronic Devices 

      Starasotnikau, M. A. (БНТУ, 2020)
      A digital micromirror device (DMD) micromirrors periodic spatial structure is a measuring scale in interior orientation parameters calibration of optoelectronic devices problems, when using a DMD as a testobject. It is important that DMD micromirrors periodic spatial structure remains constant. Change in a DMD micromirrors spatial structure may occur due to heating. In addition ...
      2020-06-30

    • Determination of Flow Characteristics in Technological Processes with Controlled Pressure 

      Reader, T.; Tenenev, V. A.; Chernova, A. A. (БНТУ, 2020)
      Assessment of the environmental and economic performance of a safety valve requires information about the flow of the substance through the valve when it is actuated. The goal of this paper was to determine the flow rate of the discharged substance and the mass flow rate of the substance entering the safety valve when it is actuated. Proposed a mathematical model to describe the ...
      2020-09-18

    • Determination of Parameters of Electrode Metal Transported Drops by Simulation and Visualization 

      Ilyaschenko, D. P.; Kryukov, A. V.; Lavrova, E. V.; Kuznetsov, M. A.; Verkhoturova, E. V. (БНТУ, 2020)
      The nature of the molten electrode metal melting and transfer is the main process parameter of manual metal arc welding (MMA) with coated electrodes. It significantly affects the efficiency of the welding process. For this reason the relevant task is to identify the parameters of the transferred molten electrode metal drops and their further transfer into the weld pool with maximum ...
      2020-09-18

    • Dual Wavelength Chirped Pulse Regenerative Amplifier Based on Yb3+:LuAlO3 Crystal for Terahertz Applications 

      Rudenkov, A.; Kisel, V.; Yasukevich, A.; Hovhannesyan, K.; Petrosyan, A.; Kuleshov, N. (БНТУ, 2020)
      Compact diode-pumped chirped pulse regenerative amplifier systems with pulse repetition rate of hundreds kilohertz based on Yb3+-doped crystals are of practical importance for wide range of applications such as materials processing, medicine, scientific research, etc. The aim of this work was to study the Yb3+:LuAlO3 crystal based dual wavelength chirped pulse regenerative ...
      2020-03-16

    • Features of Measuring the Hardness of a Metal Surface Modified with Ultrafine Particles of Minerals 

      Skazochkin, A. V.; Bondarenko, G. G.; Zukowski, P. (БНТУ, 2020)
      One of the important characteristics of the surface properties of metal parts subjected to friction is hardness. Hardness measurements are important for determining the operational characteristics of parts and monitoring the technological regimes of surface modification. However, hardness measurements of thin modified layers made by different methods can lead to differences in ...
      2020-09-18

    • Features of Аpplication of a Сombined Аpproach to the Еvaluation of the Мeasurement Results Uncertainty 

      Serenkov, P. S.; Hurevich, V. L.; Tolochko, T. K. (БНТУ, 2020)
      The article exposes description of features of the combined approach application to the evaluation of measurement results uncertainty. The aim of this work is the justification and development of new science-driven approaches to achieve maximum efficacy of measurements on the criteria "accuracy/costs" at the stated level of confidence. It provides theoretical base for correctness ...
      2020-03-17

    • High Power SESAM Mode-Locked Laser Based on Yb3+:YAlO3 Bulk Crystal 

      Rudenkov, A.; Kisel, V.; Yasukevich, A.; Hovhannesyan, K.; Petrosyan, A.; Kuleshov, N. (БНТУ, 2020)
      Yttrium aluminium perovskite YAlO3 (YAP) crystal, doped with rare-earth ions, has been extensively studied as a diode-pumped laser host material. The wide interest to rare-earth ions doped YAP crystals is explained by its good thermal and mechanical properties, high natural birefringence, widely used Czochralski growth method. The aim of this work was to study the Yb3+:YAlO3 ...
      2020-09-18

    • In-Band Pumped Continuous-Wave Lasers Based on Ho:KY(WO4)2 Crystal and Ho:KGdYbY(WO4)2 Epitaxial Layer 

      Dernovich, O. P.; Gusakova, N. V.; Kisel, V. E.; Kravtsov, A. V.; Guretsky, S. A.; Pavlyuk, A. A.; Kuleshov, N. V. (БНТУ, 2020)
      2 μm lasers are in demand for a number of practical applications, such as environmental monitoring, remote sensing, medicine, material processing, and are also used as a pump sources for optical parametric generators. Crystals of double potassium tungstates doped with ions of rare-earth elements were shown to be promising materials both for the creation of classical solid-state ...
      2020-12-18

    • Ionization Efficiency in a Hot Flat Disc-Shaped Cavity 

      Turek, M. (БНТУ, 2020)
      Hot cavity ion sources of different kinds are widely used in nuclear and mass spectroscopy, especially in on-line isotope separation devices attracting attention of scientists and engineers looking for high ionization efficiency, robustness and beam purity. In the paper a new type of hot ionizer cavity is proposed: namely cavity having the shape of a flat disc, which may be ...
      2020-06-30

    • Measurement of Steel Structure Elements in the Specialized Module of the IMAGE-SP Image Processing Software 

      Anisovich, A. G. (БНТУ, 2020)
      Grain size is one of the most important characteristics of the microstructure of metals and alloys. Determination of the grain size of steel is regulated by Standart 5639-82 "Steels and alloys. Methods for detection and determination of the grain size". Standart includes determining the grain score by comparison with reference scales, as well as manual measurement methods. The ...
      2020-12-18

    • Measurement Stand, Method and Results of Composite Electrotechnical Pressboard-Mineral Oil Electrical Measurements 

      Rogalski, P. (БНТУ, 2020)
      The paper presents a measuring stand designed and built for testing direct and alternating current properties of power transformers basic insulation component i.e. electrotechnical pressboard impregnated with transformer oil. Measurements of direct and alternating current parameters are performed using the frequency domain spectroscopy and polarization depolarization current ...
      2020-09-18

    • Measuring Setup for Investigation and Visualization of the Percolation Phenomenon in Non-Оrdered Models of Metal-Dielectric Nanocomposites 

      Okal, P. (БНТУ, 2020)
      The study uses the phenomenon of high voltage partial discharge to investigate the phenomenon of percolation and visualisation of the percolation channel. The phenomenon of partial discharges is very similar to the quantum tunneling phenomenon observed in metal-dielectric nanocomposites. In both cases the flow of alternating current occurs in the absence of direct contact between ...
      2020-09-18

    • Methodology of Defining of the Radiation Therapy Components for Various Methods of Patients’ Treating Using Medical Linear Accelerators and Gamma-Therapeutic Devices 

      Titovich, E. V.; Piatkevich, M. N.; Makarava, N. I. (БНТУ, 2020)
      One of the main factors affecting the effectiveness of radiation therapy is the constancy of the patient’s position on the treatment table created by immobilization devices of various designs and held throughout the entire irradiation procedure, which guarantees the accuracy of the delivery of the prescribed dose distribution. The purpose of the work was to establish the numerical ...
      2020-12-18

    • Negative Ion Beam Emittance Calculations 

      Turek, M.; Wegierek, P. (БНТУ, 2020)
      Computer simulations are commonly used to support design and optimisation of powerful negative ion sources for the needs of future thermonuclear reactors like e. g. ITER. The aim of the paper was to study changes of produced beam quality (described by its emittance and brightness) with the geometry of the extraction system as well as extraction voltage. A two-dimensional ...
      2020-03-17

    • Output Characteristics of Graphene Field Effect Transistors 

      Mishchenka, V. N. (БНТУ, 2020)
      The use of graphene, which has high mobility of charge carriers, high thermal conductivity and a number of other positive properties, is promising for the creation of new semiconductor devices with good output characteristics. The aim was to simulate the output characteristics of field effect transistors containing graphene using the Monte-Carlo method and the Poisson equation. ...
      2020-12-18