bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of water deaeration technologies with boiler exhaust gases
Authors: Zamaleev M M , Kovalnogov V N , Kamalova R I , Pazushkina O V 
Published: November 2021

Abstract
The calculation of the heat and mass transfer efficiency of the proposed technology for deaeration of water by the exhaust gases of a gas-proof boiler in deaerators of serial design has been performed. The conditions and criterial values of the media consumption in the apparatus have been studied. It is shown that the technology can be successfully applied in operating thermal power plants.
A collocation method for the Williams equation with Chebyshev polynomials
Authors: Germider O V , Popov V N 
Published: November 2021

Abstract
The linearized problem of gas flow in plane channel with infinite walls has been solved in the kinetic approximation. The flow in the channel is caused by a constant pressure gradient parallel to the walls of the channel. The Williams equation has been used as a basic equation, and the boundary condition has been set in terms of the diffuse reflection model. The collocation method for Chebyshev polynomials has been applied to construct the solution of the equation of Williams with the given boundary conditions. The mass flux of the gas in the channel has been calculated.
Analytical theory of high-speed nonequilibrium in a binary mixture of gases with a predominant light component
Authors: Demidov I V , Kuznetsov M M , Kuleshova Y D , Tikhonovets A V 
Published: November 2021

Abstract
Analytical estimates are obtained that allow, first of all, to determine the fundamental conditions for the existence of a high-speed effect. In addition, an analytical assessment of the greatest value of this effect is given.
The attack strategy for a quantum key distribution protocol based on Bell’s theorem
Authors: Hein Chan Myae , Kamalov T F 
Published: November 2021

Abstract
A new eavesdropping strategy is proposed for the Quantum Key Distribution (QKD) protocol. This scheme represents a new kind of intercept/resend strategy based on Bell’s theorem. Quantum key distribution (QKD) provides the foremost reliable form of secure key exchange, using only the input-output statistics of the devices to realize information-theoretic security. In this paper, we present an improved QKD protocol that can simultaneously distribute the quantum secret key. We are already using the QKD protocol with simulated results matched completely with the theoretical concepts.
Light-reflecting characteristics of optically rewritable electronic paper
Authors: Kudreyko A A , Chigrinov V G 
Published: November 2021

Abstract
Light-reflecting characteristics play a crucial role in optically rewritable liquid crystal display (electronic paper). By using a special optimizer software, light-reflecting characteristics of the twisted nematic cell were calculated. The achieved values of the normalized reflection coefficients range within ∼ 0.03 - 0.43, which is comparable or better than other commercial technologies. The calculated contrast ratio of the device is 10 : 1. A 2D image, which can be displayed on the electronic paper was obtained. Comparison of the simulated background color and contrast ratio is very similar with the results, which were obtained in experimental cells of other studies. Our calculations indicate that angular dependence of the reflectance coefficient is almost uniform within a wide range of viewing angles.
Diamagnetic anisotropy and rotational viscosity of 6CHBT nematic liquid crystal
Authors: Kurilov A D , Chekulaev I S , Shammai Irani S M , Parashchuk N S , Bezruchenko V S , Belyaev V V , Chausov D N 
Published: November 2021

Abstract
Nematic liquid crystal with polar terminal NCS group was studied by using acoustic and electro-optical methods. Experimental results on rotational viscosity have been obtained by two methods. The anisotropy of diamagnetic susceptibility of the studied LC with temperature variation was determined based on the comparison of these methods. The present results may be useful for testing physical models of the orientation dynamics of nematic liquid crystals in alternating electric and magnetic fields.
Resistance investigation of diamond-like carbon coatings to cyclic temperature changes
Authors: Makeev M O , Osipkov A S , Batshev V I , Mikhalev P A , Parshin B A , Suasnavas C V , Kozlov A B , Machikhin A S 
Published: November 2021

Abstract
Optical elements used in outer space must be designed considering the effects of such factors as space vacuum, atomic oxygen in low Earth orbit, solar and space radiation, large temperature drops, gas release of spacecraft materials and structural elements, space dust and debris. In order to harden and protect mirror surfaces of optical elements from external factors, it has been promisingly applied diamond-like carbon coatings on their surface. These coatings are characterized by high strength and wear-resistant properties, in particular, high hardness, low friction coefficient, high wear resistance and chemical inertness. This leads to their widespread use in various fields of science and technology, including optical instrumentation. This paper presents the results of testing an aluminum mirror with a diamondlike carbon coating under the effect of cyclic temperature changes for determining their ability to withstand a rapid cyclic ambient temperature change, and specifically, to maintain optical and mechanical properties.
The formation of strip-like vortex motion by surface gravity waves
Authors: Poplevin A V , Filatov S V , Levchenko A A 
Published: November 2021

Abstract
We studied experimentally the generation of vortex flow by non-collinear gravity waves with a frequency of 2.34 Hz. The vortices formed on the water surface have the form of stripes, the width L=π/(2k sin θ) of which is determined by the wave vector k and the angle between them, and the length is determined by the size of the system. We demonstrate that the measured dependence Ω(t) can be described within the recently developed model that considers the Eulerian contribution to the generated vortex flow and the effect of surface contamination.
Particularities of photonic and structural transformations in the polystyrene film during pulsed infrared laser irradiation
Authors: Tsebruk I S , Provotorov P.V. , Klassen N V 
Published: November 2021

Abstract
Two new kinds of the structural in-homogeneities in the polystyrene films were created by the irradiation of the film with nanosecond pulses of the infrared laser with 1064 nm wavelength. At the beginning of the irradiation dark micro-inclusions having unusual close to rectangular geometries appeared. After about 30 seconds of the irradiation one more kind structural distortions appeared having the geometries of the systems of the concentric micro-rings. Simultaneously with the creation of these concentric micro-rings the film started to emit bright blue luminescence all over its area and significant focusing of the laser beam during its propagation through the film was observed resulting in the generation of the bright white flashes at the screen installed behind the film. The creation of the dark rectangular spots as well as of the concentric micro-rings are ascribed to the non-linear interactions between the laser radiation and the structural distortions produced in the film due to photo-thermal processes excited in the film.
Specificity of the second sound standing waves behavior in a medium with nanoparticles
Authors: Esina A A , Efimov V B 
Published: November 2021

Abstract
The experimental studies of the second sound waves propagation in a resonator with a deuterium-helium gel were carried out. The latest experimental results, combined with those obtained in earlier experiments, have shown that the propagation of the second sound waves in gels leads to their significant attenuation and a decrease in the propagation velocity. This behavior differs from the case of the propagation of the sound waves of a two-component system with a strongly slow normal component and may indicate changes in the properties of superfluidity under confined geometry conditions.
Broad temperature range ferrielectric liquid crystal with subwavelength helix pitch
Authors: Kuznetsov A V , Minchenko M V , Tkachenko T P , Pozhidaev E P 
Published: November 2021

Abstract
The ferrielectric liquid crystal (FerriLC) phase with the helix pitch po
of about 100 nm was revealed in a broad temperature range from -3°C to + 35°C in a mixture containing an achiral smectic-C (SmC) biphenylpyrimidine and two non-mesogenic chiral diesters of 4,4”-terphenyl dicarboxylic acid.
Computational experiment of the thin-film electroluminescent display devices applicability in aviation
Authors: Evsevichev D A , Maksimova O V , Samokhvalov M K 
Published: November 2021

Abstract
The development of methods and means of testing the applicability of thin-film electroluminescent indicator devices as displays in aircraft is carried out. Thin-film electroluminescent displays are used in equipment and systems that require high image quality and reliability, as well as a long service life of the devices. The result of the performed work is the ExpAT program, which allows to carry out a computational experiment to test of the applicability of the TFEL indicator devices in aeronautical engineering. As a result of the computational experiment, variants of structures of thin-film emitting structures that meet the operating conditions of indicators in avionics are shown.
Automation of procedure for diagnostics of thin film electroluminescent indicators’ structure
Authors: Maksimova O V , Nikolaev P V , Moiseenko S V , Belyaev V V 
Published: November 2021

Abstract
Problems of measurement automation for creating a testing system are considered. This system accelerates the process of parameters controlling in the production and development of new samples of indicator (display) technology. The main parameters of the indicators are defined, the tasks of automation of measuring processes are indicated, the hardware and software structure of the system is developed. The main features of an integrated approach to solve the problems of automating the process of testing the structures of thin-film electroluminescent indicators were proposed, the parameters of thin-film electroluminescent indicators were considered as the basis for forming the composition of an automated testing complex, and the automation of processing the experimental results at the software level was described. The ideas outlined in this article make it possible to formulate a technical task for the development of a complex for automated measurement of the parameters of thin-film electroluminescent elements, as well as its components and software.
Evaluation of electromagnetic pollution index (EMPI) emitted from multiple sources
Authors: Frah M A A , Belyaev V V 
Published: November 2021

Abstract
In this paper the cooperative electromagnetic pollution index (EMPI) from many RF sources is evaluated in terms of three components which are strength of magnetic and electric field expressed in A/m and V/m, respectively, and irradiated power in W/m2. They are generated by a portable laptop computer (LC) with a liquid crystal monitor and other three sources in front area of it. The LC radiation interference with radiation from mobile phone, Wi-Fi and microwave oven in the radio frequency range from 300 Hz up to 3GHz has been measured. The experiment involves testing 45 different points in the keyboard area and 45 points in the in front area of the PC in its operating state. After that a comparison was made between the calculated values for multiple sources frame work and the measured experimental values. Then these EMPI values have been compared with the internationally recommended SAR values.
Physical and methodological approach to the modern methods of the investigation of dental materials properties
Authors: Kobzar A N 
Published: November 2021

Abstract
Each medical doctor should be able to complete professional tasks using their knowledge of physics, especially when providing a comprehensive care to a patient. This article reveals how to use knowledge of the course of physics specially developed of a Medical University to help trainee medical doctors to develop skills to complete professional tasks. Content of physics and its tasks for a Medical University must be professionally oriented. This article provides a classification of professionally oriented questions of physics specially made to be taught at a Medical University. It also gives content a sample of a professionally oriented task in physics for a Medical University. All these above mentioned tasks are closely correlating with each other. As an example, the article explains specific of teaching Biophysics at a Medical University. Professionally oriented content of Biomechanics - modern methods of study properties of materials used for dental care. Methods of physics for destructive inspection testing: tensile strength, compressive strength, hardness of materials, Poisson's ratio, fluctuating stress and dynamic testing etc. Methods of physics for non-destructive inspection testing: thermal, acoustic, optical, radio-wave, radiative, capillary, magnetic and electric testing.
Computational studies to determine the design of prototype heater for a hypersonic wind tunnel
Authors: Rtishcheva A S 
Published: November 2021

Abstract
During the modernization of the TsAGI hypersonic wind tunnel, which implies an increase in the limiting values of the flow stagnation parameters, and in the thermal load, consequently, computational studies were realized for the existing design of the electric arc heater and new geometry options for the central electrode and the cooling duct of the external electrode and nozzle. The distribution of the heat flux density to the surfaces of the main elements of the wind tunnel was obtained based on the calculations for the air duct of wind tunnel. The qualitative data of the flow formation both in the pre-heater and the pre-chamber served as the basis for changing the geometry of the central electrode. In this study, a numerical modelling approach was implemented for a through calculation of the flow and heat transfer in all areas of the wind tunnel circuit (heater, pre-chamber, nozzle, test section, diffuser). The ANSYS FLUENT software package was used to solve the axisymmetric Navier-Stokes equations for a five-component chemically reacting gas mixture: O2; N2; O; N; NO using the Spalart-Allmaras turbulence model. To study the hydrodynamics and thermal state of the structure of the external and central electrodes, the possibility of the ANSYS FLUENT complex for solving conjugate problems was used (the complete Navier-Stokes equations and the energy balance equation were solved in a fluid, and the heat conduction equation was solved in a solid). In this case, at the interface between the media, the conditions for the continuity of temperature and heat flux were satisfied.
Giesekus fluid flow past a sphere in a pipe
Authors: Kadyirov A I , Zaripov R R , Kutuzova E R , Vachagina E K 
Published: November 2021

Abstract
A numerical simulation of a viscoelastic fluid flow past a sphere in a round pipe is carried out. The four mode Giesekus model is taken as a rheological model. By the example of a polymer melt flow, the features of the flow around a sphere in comparison with the flow around a cylinder are revealed. Velocity and stress profiles for polymer melt and polymer solution fluid flow around a sphere at the same Weissenberg numbers are analyzed.
Semi-analytical solution for the problem of extended Pom-Pom fluid flow in a round pipe
Authors: Kadyirov A I , Vachagina E K 
Published: November 2021

Abstract
A semi-analytical solution to the problem of the steady flow of viscoelastic single equation eXended Pom-Pom (XPP) fluid in a round pipe using the four-mode rheological equation of state of XPP is presented. An original parametric method for solving the set problem is used. The resulting method is applicable for solving a similar problem in a flat slit. The developed solution method is tested by comparing it with numerical results and experimental data. Using a polyacrylamide solution as an example, the influence of the Weissenberg number on the axial velocity profiles and the components of normal stresses is studied.
Studying the unsteady characteristics of a laminar transonic buffet depending on the angle of attack
Authors: Polivanov P A , Sidorenko A A 
Published: November 2021

Abstract
Laminar transonic buffet on the airfoil for low Reynolds numbers of 0.5-0.7⋅106 was experimentally studied. Basic experiments were performed using high-speed schlieren imaging. The unsteady flow structure was investigated using various methods. It was found that shock wave oscillations can be significantly different from the turbulent case. The frequency and amplitude characteristics of oscillations from the angle of attack were found.
Computational study of the efficiency of various methods of intensification of convective heat transfer
Authors: Frantsuzov M S 
Published: November 2021

Abstract
This paper presents the results of a computational study of the efficiency of various methods of heat transfer intensification in model channels containing various types of intensifiers. The following methods of intensification of convective heat transfer are considered: acoustic, the intensifiers twisted tape, wire spiral, and joint intensifier of a wire spiral and twisted tape. The study of thermal and hydraulic processes in the channels is carried out using computer modeling based on the solution of the Navier-Stokes equations averaged by Reynolds, the energy and state equations supplemented by the turbulence model. The thermal and hydraulic characteristics of various methods of heat transfer intensification are determined in the range of Reynolds numbers from 10000 to 60,000, and the efficiency of the intensification is determined based on the author's criterion. The characteristics of a smooth channel in the above-mentioned range of Reynolds numbers are considered as reference thermal and hydraulic characteristics. Comparative analysis has shown that the acoustic method of heat transfer intensification is most effective in the range of Reynolds numbers, where different modes of self-sustaining acoustic oscillations occur. The presented results may be used in the development and design of heat exchangers.
Applying the scalability apparatus to estimate the thermal efficiency of a single finned tube
Authors: Gizzatullina A A , Mishchenkova O V , Pushkarev F N 
Published: November 2021

Abstract
The paper explores the possibility of scaling the integral parameters of the cooling system operation using the working elements with the length from 0.01 to 0.5 m. Numerical solution of the conjugate problem of external aeromechanics, internal hydrodynamics and heat exchange is carried out. Parametric studies of the cooling process and aerodynamic resistance of finned tubular elements of various lengths are performed. As a result of generalization and unification of the computational experimental data, a numerical coefficient has been obtained to calculate the necessary integral characteristics for a cooling element of the assigned length.
Solid-state mechanochemical technology for deep processing of brown coal: energy efficiency improvement and dust formation control
Authors: Matveeva AG , Skripkina TS , Bulanova UE , Bukhtoyarov VA , Bychkov AL , Lomovsky I O 
Published: November 2021

Abstract
Energy efficiency – a compromise between reaction depth and expended energy - is an actual question for any technology implementation. Mechanochemical technology for brown coal deep processing has one more compromise - between reaction depth and dust formation. Indeed, the depth of mechanochemical reactions usually correlates with grinding efficiency, but for coal cases dust formation is an unwanted process. Here we consider a solid-state mechanochemical reaction of humic acid oxidation by sodium percarbonate in one laboratory mill at different conditions. The ratio between the grinding bodies load and the payload was varied, the reaction yield and the ground samples characteristics were controlled.
Numerical study of single bubble mobility in triangular and deltoid microchannels using the boundary element method
Authors: Bulatova A Z , Solnyshkina O A , Fatkullina N B 
Published: November 2021

Abstract
The study of bubbly liquid dynamics in microchannels of unconventional shapes is of great importance for different fields of science and industry. This work investigates the dynamics of the incompressible single bubbles in the slow periodic flow of viscous liquid in a triangular channel with a variable pressure gradient. The numerical approach used in this research is based on the boundary element method (BEM). This method is widely used for solving three-dimensional problems and problems in areas with complex geometry. The influence of the bubble’s initial position relative to the channel centerline on the bubble deformation, the relative velocity of the bubble, and its center of mass displacement in the channel are considered.
Comparing hydrogen absorption kinetics of the samples of intermetallic compound and metal hydride compact on its basis
Authors: Romanov I A , Borzenko V I , Kazakov A N 
Published: November 2021

Abstract
This work is devoted to an experimental study and comparison of the kinetics of hydrogen absorption by an intermetallic compound LaNi4.4Al0.3Fe0.3 in form of pure intermetallic compound free backfill and a compact based on it obtained by cold pressing with a spiral matrix of nickel-foam. To calculate the kinetic parameters of the hydrogen absorption reaction, the initial rates method is used. The PCT absorption isotherms are measured at temperatures of 313, 333, and 353 K. The experimental data are described with quite high confidence by the chosen model, which assumes that the reaction rate controlling step is the dissociative absorption of hydrogen on the surface of the a-phase. The rate of hydrogen absorption increases with increasing pressure drop and temperature. It is shown that the rate of hydrogen absorption by the sample of pure IMC is significantly less dependent on temperature compared to the compact sample. In addition, the reaction rate at temperatures of 313 and 333 K is higher for the free backfill sample, and at 353 K it is higher for the metal hydride compact. The values of the absorption constant and the activation energy of the hydrogen absorption reaction are determined for both samples.
Mathematical modelling of a laminar suspension flow in the flat inclined channel
Authors: Iulmukhametova R R , Musin A A , Kovaleva L A 
Published: November 2021

Abstract
The laminar flow of a suspension consisting of viscous incompressible fluid with solid spherical particles of the same size in a flat inclined channel is investigated in this work. The mathematical model is formulated in a one-fluid approximation in a three-dimensional statement and solved in the OpenFOAM software package. The results of mathematical modeling are compared with experimental data. The study of the dynamics of the distribution of solid spherical particles in the flow and sedimentation along the length of the channel depending on the size of particles and the angle of inclination of the channel relative to the horizon is carried out.