bluuebunny/crossref_metadata_2025_split huggingface dataset:
A method of air-blast atomization of foamed liquid fuels for advanced combustors of gas-turbine engines
Authors: Vasilyev A Yu , Chelebyan O G , Sviridenkov A A , Domrina E S , Loginova A A , Tarasenko A N 
Published: December 2020

Abstract
The design of the combined nozzle module with bubbling and pneumatic spraying for the low-emission combustion GTE chamber has been carried out. Based on pervious work and literature analyzie a prototype of new combined nozzle module with five places of bubbling air supplying were pre-designed. To pre-select the position of the emulsification holes and to determine the possibility of combining the emulsion and pneumatic spraying principles in one design a series of experiments was carried out. The first results obtained using even not optimized device, showed that in modes close to the ground start and idle, the quality of the fuel spraying was improved by 30 % using the method of low-flow fuel bubbling.
Simulating heat and mass transfer processes during water film evaporation in a horizontal channel
Authors: Gorbachev M , Terekhov V 
Published: December 2020

Abstract
This paper is devoted to the numerical study of heat and mass transfer at evaporative cooling of a stream of a moist air in the horizontal channel, taking into account the final thickness of a film of water. Heat and mass transfer simulation is based on solving a system of differential equations for the laminar flow regime of air flow in a two-dimensional setting in the boundary layer approximation. Numerical studies are performed in a wide range of input parameters changes: temperature T0=10÷50 °C, relative humidity φ0 = 0÷100 %, and Reynolds number Re = 50÷2000. The geometric dimensions of the channel are taken for height H = 6 mm and length L = 50H. Calculations are performed at atmospheric pressure.
Study of heat transfer during cooling of highly loaded structural elements with a two-component heat carrier flow
Authors: Demidov A S , Tupotilov I A , Zakharenkov A V , Loktionov V D 
Published: December 2020

Abstract
One of the promising directions for the development of energy in the 21st century is thermonuclear energy. To implement this method of generating energy, experimental thermonuclear reactors have been operating for decades, the largest of which is currently being built in Cadarache (France). At the moment, one of the unsolved problems of such reactors is the creation of systems that provide reliable heat removal of heat fluxes from intracameral objects, such as a limiter, blanket, and divertor. In addition to high energy density, these objects have quite significant dimensions. Today, cooling of such objects is carried out mainly by water under pressure. This paper considers the possibility of using a dispersed two-component coolant flow as an alternative method of cooling such objects. A description is given of an experimental bench simulating uniform heating along the perimeter of the test section and it’s main systems. The paper presents the design of a spray device for forming a two-component dispersed coolant flow with its technical characteristics and a working area for conducting research. Experimental data were obtained on the temperature of the wall of the working area at various operating parameters of the coolant and power input.
SigmaFlow CFD code as a tool for predicting the wind environment around a group of buildings
Authors: Meshkova V D , Dekterev A A , Gavrilov A A , Litvintsev K Yu 
Published: December 2020

Abstract
The paper reveals the capabilities of SigmaFlow CFD code to predict wind conditions in terms of pedestrian comfort as illustrated by a model problem. The proposed numerical model was verified by comparing with experimental data. A group of buildings consisting of low-rise buildings and a high-rise building was considered. A comparative analysis of five computational variants with different grid saturation was performed. The results of mathematical modeling allow observing the vortex flow structure that is generated when streamlining buildings.
A new approach to the development of zero-emission power generation system
Authors: Ryzhkov A F , Bogatova T F , Maslennikov G E , Osipov P V 
Published: December 2020

Abstract
The problems of tightening harmful emissions standards and meeting commitments to reduce greenhouse gas emissions require the development of environmentally and economically viable technologies to capture CO2 and its subsequent utilization. The integration characteristics of the generic technologies for CO2 emission utilization from energy industries with a short, medium- and long-term commercialization prospects are considered, depending on the level of technological maturity and market attractiveness. Potential CO2 consumers were classified according to the central most sensitive energy generation parameters: volumes, pressure, and purity, depending on the CO2 capture processes parameters and types of thermal power plants. The CO2 utilization unit principles designed for full CO2 capture by various industries under the Paris agreements are considered. The joint analysis of the operating and prospective power plants, leading industrial technologies based on CO2 consumption, has revealed three types of energy-industrial symbioses representing a cost-effective “Power Plant – CO2 Consumer” model. This model operates without CO2 capture and conditioning unit and has the efficiency close to the traditional power plant without emissions utilization. Critical technology solutions are being developed for one of these types.
Stimulated Raman scattering in suspension of submicron diamond particles
Authors: Baranov A N , Bi Dongxue , Gorelik V S , Kudryavtseva A D , Maresev A N , Shevchenko M A , Skrabatun A V , Tcherniega N V 
Published: December 2020

Abstract
We report on the first experimental observation of stimulated Raman scattering (SRS), stimulated low-frequency Raman scattering and multiphoton excited negatively-charged single nitrogen-vacancy (NV-) centers luminescence in ethanol suspension of submicron diamond particles obtained at high pressures and temperatures (HPHT). The Stokes and anti-Stokes SRS components with a frequency shift of 1332 cm−1, corresponding to the fundamental optical mode of diamond crystal were observed. The spectral characteristics and energy thresholds of the studied processes were determined.
Hybrid interferometer system for velocity measurements
Authors: Pirog V A , Gubskiy K L , Yu Tishenko I , Kazieva T V 
Published: December 2020

Abstract
The first result of the developed hybrid system for measuring the mass velocity of a matter is presented in the article. It combines two methods, VISAR and PDV, to compensate for their shortcomings. The scheme of the measuring system and the results of the laboratory experiment are shown.
Ceramic packages prototyping for electronic components by using laser micromilling technology
Authors: Samotaev Nikolay N. , Oblov Konstantin Yu , Gorshkova Anastasia V. , Ivanova Anastasia V. , Philipchuk Dmitriy V. 
Published: December 2020

Abstract
The use of adaptive laser micromilling technology for the fast prototyping ceramic package of electronic components in a miniature surface mount form factor (SMD) is describing. Current experimental results and practical evaluation of one show that using the developed software and hardware is possible successfully producing SMD packages starting from the SOT-723 form-factor in the direction of larger overall dimensions to SOT-475 form-factor. Also discussed are the limiting physical factors arising in the course of the application of laser micromilling technology, which affect the production speed and quality of the resulting product from monolithic ceramics.
Focusing aspherical optical components for next generation megajoule laser system
Authors: Gorshkov V A , Saveliev A S , Nevrov A S , Smirnova A V 
Published: December 2020

Abstract
The idea of creating a laser thermonuclear installation was considered back in 1960s by Basov N and Krokhin O. [1]. Facility for conducting research near DT-fuel ignition threshold is being commenced at the moment [2], assembly of the laser installation interaction chamber has already been completed. To focus laser sight on the target, off-axis aspherical lenses are used as part of the final optical module (FOM). These lenses are manufactured using the developed technology of forming off-axis aspherical surfaces of optical parts. Combined use of shaping technology and stand for monitoring angular deviations of the surfaces of FOM lenses, allowed us to achieve high quality off-axis aspheric optical elements both in terms of standard deviation of the surface shape, as well as the value of the scattering circle.
Plasma-chemical processes in the mixtures “metal-organic compound” and “metal-inorganic salt” initiated by pulse radiation of gyrotron
Authors: Akhmadullina N.S. , Skvortsova N.N. , Obraztsova E.A. , Stepakhin V.D. , Konchekov E.M. , Kargin Yu.F. , Konovalov A.A. , Shishilov O.N. 
Published: December 2020

Abstract
Plasma-chemical processes in the mixtures of metal+organic compound and metal+inorganic salt under treatment by microwave pulses are described. The microwave pulses were generated by high-power gyrotron (frequency 75 GHz, power up to 550 kW, pulse duration from 0.1 to 15 ms). Al + melamine (1:1, 2:1 and 3:1 by molar) and Al + Al2O3 + NH4Cl (1:2:2 and 1:2:4 by molar) were treated in air with microwave pulses with power of 150-K350 kW and duration of 2^8 ms. It was found that the discharge can be easily initiated for both mixtures at minimal pulse duration of 2 ms. For Al + melamine mixture the energy threshold for the discharge depends linearly on the mass content of Al and does not exceed 1.0 kJ/g. For Al + Al2O3 + NH4Cl the threshold is also below 1.0 kJ/g. The products of treatment of Al + melamine contain mainly starting materials and no nitride phases, in case of Al + Al2O3 + NH4Cl some traces of Al11O15N were identified.
Application of the Green Function Method for Calculating the Spatial Distribution of Electrons in the Finite System
Authors: Yu Igashov S , Blinnikov S I , Kuratov S E , Shidlovski D S 
Published: December 2020

Abstract
The paper presents a numerical implementation of the Green’s function method for calculating the spatial distribution of the macroscopic number of free electrons in a finite system. The obtained results are compared with the results obtained by direct summation of the wave functions. The quantitative coincidence is demonstrated.
On numerical modeling of natural convection based on the OpenFOAM solver
Authors: Kozlov V.K. , Chmykhov M.A. 
Published: December 2020

Abstract
This work considers numerical modelling of natural incompressible convection problems in the gravity field in the Boussinesq approximation using OpenFOAM. A mathematical model of natural convection in the gravity field, using Boussinesq approximation, was considered. The built-in solver was identified and modified. The exact solution, theoretical data and experiment were used to verify the solver. A numerical study of natural convection in a horizontal liquid layer was performed. Natural convection in a fluid layer between coaxial cylinders was considered.
Numerical modeling of the switching processes in the second generation HTS tapes under the electric pulses impact
Authors: Anischenko I V , Pokrovskii S V , Rudnev I A 
Published: December 2020

Abstract
This paper presents the results of complex multiphysical modeling of nonequilibrium states arising in high-temperature superconducting composites under the pulsed current impact. The time dependences of the voltage on the superconducting tape under the influence of current pulses for the pulse amplitudes from 0.6 to 2 values of the critical current of the tape are obtained. Two linear modes of the sample voltage behavior during the electric current load are distinguished. A stable HTS sample switching at the current pulse amplitudes less than 1.7 Jc
and the development of irreversible dynamic thermal instability for the higher currents are shown. The simulation was performed by the finite element method in the Comsol Multiphysics software package.
Taking into account Abrikosov vortices in numerical solution of Ginzburg-Landau equations
Authors: Kartsev P F 
Published: December 2020

Abstract
The method is described to take into account the Abrikosov vortices in numerical study of superconducting quantum state in the framework of Ginzburg-Landau equations. The main idea is based on explicit extraction of the solution component related to the vortices. Such approach can be especially useful to study problems with fixed vortex positions.
Tribological characteristics of hard Zr-Si-B coatings in sliding friction and cycling impact loading terms
Authors: Kiryukhantsev-Korneev Ph V , Sytchenko A D 
Published: December 2020

AbstractCoatings were obtained by magnetron sputtering of a ZrSiB target onto WC-6%Co substrates. Samples were studied in terms of their structure, friction coefficient, wear- and impact loading resistance. The Zr-Si-B coating contained the hexagonal ZrB2phase. Coating deposition reduces the friction coefficient of the substrate by 10% and increases the resistance to impact loads by 25-50%.
Thermal energy converters based on granular silicon
Authors: Abdurakhmanov B M , Adilov M M , Sh Kurbanov M 
Published: December 2020

Abstract
The use of granular silicon (GS) makes it possible to create a system like “electronic crystal-phonon glass” and reduce the cost of materials. With GS from silicon slurry, it is possible to obtain values of the Zeebeck coefficient of ∼500 μV/deg and to reduce the thermal conductivity by 7-9 times as compared to single-crystal silicon. The GS high conductivity is proposed to be achieved by resonant tunneling of current carriers through a nanosized SiO2 layer covering the GS particles.
Formation of structure of TiNiCu alloys with high copper content upon producing by planar flow casting
Authors: Shelyakov A V , Sevryukov O N , Sitnikov N N , Borodako K A , Khabibullina I A 
Published: December 2020

Abstract
The rapidly quenched alloys of the quasibinary intermetallic TiNi-TiCu system with a high copper content (more than 25 at.%) are of great interest as shape memory materials due to the possibility of a significant decrease in the temperature and deformation hysteresis in comparison with the binary TiNi alloy. To obtain alloys with a copper content of 25 to 40 at.%, the planar flow casting technique was used. The alloys were fabricated at a melt cooling rate of about 106 K/s in the form of ribbons 30-50 μm thick and wide in the range from 7 to 20 mm. The study of the structure of the alloys was carried out using X-ray diffraction analysis, scanning and transmission electron microscopy. It was shown that from the ribbon side, contacting the quenching wheel, all alloys are amorphous, while on the non-contact side of the ribbons of alloys with 25 and 30 at.% Cu, a thin surface crystalline layer with a B2 structure is observed. Using energy dispersive X-ray spectroscopy, it was found that the content of the alloy components in the amorphous and crystalline phases coincides.
Investigation of thermal-structural characteristics at two-way shape memory effect of rapid quenched laminated amorphous-crystalline ribbons of Ti50Ni25Cu25 alloy
Authors: Sitnikov N N , Sivtsova G V , Shelyakov A V , Khabibullina I A 
Published: December 2020

Abstract
The work is devoted to the study of processes of structural changes leading to the realization of the two-way shape memory effect (TWSME) in the rapid quenched amorphous-crystalline alloy Ti50Ni25Cu25. The object of the study was a rapid quenched laminated amorphous-crystalline Ti50Ni25Cu25 alloy ribbon with a thickness of about 39 um and with a thickness of surface crystal layer about 10 μm was present on the non-contact side relative to the quenching wheel. In the ribbon under study, without any additional heat treatments the TWSME with bending deformation from a rectilinear shape during heating and cooling in the range of martensitic transformation is manifested. The samples were characterized by means: scanning and transmission electron microscopy; X-ray diffraction analysis; differential scanning calorimetry; measuring the characteristics of the crystalline layer during the implementation of TWSME and the temperature dependence of the form change. It was shown that the formation of a laminated amorphous-crystalline composite occurs due to the martensitic transformation of B2∼B19 in the crystal layer and the accompanying TWSME as a result of which the crystal layer is reduced.
Approaches for improving the quality of particle size distribution reconstructions from small-angle scattering data
Authors: Volkov V V , Kryukova A E , Konarev P V 
Published: December 2020

Abstract
Using a series of two- and three-component model data of small-angle scattering from systems of polydisperse spherical particles, the possibility of determination of the particle size distribution function by regularization methods, a direct histogram search, and as a superposition of smooth analytical functions has been investigated. The advantages and disadvantages of these approaches are considered. It is shown that their combined use allows one to improve the quality particle size distribution and find acceptable solutions even in the case of significant data noise. The choice of the appropriate minimization algorithms is also an important factor for efficient data analysis. A number of iterative algorithms based on the gradient minimization method, the simulated annealing method, their combination, and the Nelder-Mead method is tested and their efficiency is compared for the small-angle scattering data of a silicasol solution.
Preparation and some properties of crystal Rb2NiCl4-2H2O
Authors: Zainullin O B , Voloshin A E , Komornikov V A , Rudneva E B , Manomenova V I , Timakov I S , Kozlova N N 
Published: December 2020

Abstract
The paper presents the results of studies on the growth of Rb2NiC14-2H2Ocrystals and the study of their properties. The conditions for the reproducible production of Rb2NiC14-2H2Osingle crystals by the method of controlled decrease of solubility are determined. The optical and thermal properties of crystals obtained in this way were studied.
Local electrochemical deposition of thorium-229 targets and excitation of isomeric state by electron beam
Authors: Borisyuk P.V. , Vasilyev O.S. , Lebedinskii Yu.Yu. 
Published: December 2020

Abstract
The results of the study of local formation of thin-film coatings based on thorium oxide on SiO2/Si(111) surfaces by electrochemical deposition. It is shown that as a result of electrochemical deposition of thorium atoms from an acetone solution of Th(NO3)4 with the presence of water on the silicon surface, local formation of thorium compounds occurs. Chemical analysis of the composition of the samples obtained by XPS showed the presence of compounds based on thorium, silicon, oxygen and carbon. It is shown that annealing for 6 hours at 600? C in the atmosphere leads to the departure of carbon, and the formed film consists only of thorium and oxygen. It is shown that such a system can be promising for further studies of the nuclear low-lying isomer transition in the 229Th isotope under electron beam irradiation. The method of excitation of isomeric thorium-229 nuclei by irradiation of a solid-state target based on thorium silicate with an electron beam is considered. The process of generating secondary electrons with a significant increase in the multiplication coefficient for electrons with energies in the range from 1 keV to 25 keV is considered. The values of the output function of isomeric nuclei and the excitation cross section of an isomeric transition in inelastic scattering are obtained on the basis of numerical modeling and theoretical estimation.
Features of Quasi-frozen Spin Concept of Storage Ring for Searching for Electric Dipole Moment of Deuteron
Authors: Senichev Y. , Aksentyev A. 
Published: December 2020

Abstract
One of the possible arguments for violating CP invariance is the existence of non-vanishing electric dipole moments (EDM) of elementary particles. To search for EDM, it was proposed to create a special storage ring [1], which can implement the “frozen spin” mode. An advantage of the “quasi-frozen spin” [2] concept developed by us is the ability to adapt existing storage rings to search for the deuteron EDM, in particular the accelerator complex NICA in JINR (Dubna).
Pyrometric investigation of nanoparticles condensation process in gaseous and superfluid helium
Authors: Stepanov M E , Kulish M I , Karabulin A V , Matyushenko V I 
Published: December 2020

Abstract
The work is devoted to the study of thermal radiation accompanying the condensation of products of pulsed laser ablation of a tungsten target in vacuum, superfluid and gaseous helium. Pyrometric measurements have shown that the radiation characteristics depend on the medium. The obtained data imply that the sources of radiation in vacuum and gas are predominantly submicron particles, while in superfluid helium (He II) they are nanometer particles. These conclusions have been confirmed by electron microscopy data.
Investigation of the mechanism of solar flare and acceleration of solar cosmic rays in real conditions of the solar corona
Authors: Podgorny I M , Podgorny A I , Borisenko A V , Vashenyuk E V , Balabin Yu. V. , Meshalkina N. S. , Gvozdevskiy B. B. 
Published: December 2020

Abstract
The generation of solar cosmic rays occurs during explosive energy release in a solar flare, so in order to understand this phenomenon it is necessary to study both the mechanism of the solar flare and the process of particle acceleration by the generated electric field. During a solar flare in the solar corona above the active region (AR), the energy stored in the magnetic field of the current sheet is released. Using the results of numerical simulation and observations, I.M. Podgorny proposed an electrodynamic model of a solar flare, explaining its main observational manifestations, in particular, the appearance of X-ray emission on the surface of the Sun. The acceleration of protons occurs along a singular line of the magnetic field of the current sheet by the electric field E = -V×B/c. To obtain accurate results it is necessary to carry out MHD simulation in the real scale of time, which is only be done using parallel calculations. The parallelization of the program PERESVET carried out using graphics card (GPU), the calculations were accelerated by ~ 120 times. As a result of optimization of the approximation of the boundary conditions of free exit at the non-photospheric boundary, instability near the boundary was stabilized. The first results of MHD simulation in the real scale of time above the AR 10365 showed the appearance of a plasma flow near singular X-type lines, which have to cause to the formation of a current sheet.
Precision measurements of cosmic ray electron and positron spectra above 50 MeV with the PAMELA magnetic spectrometer
Authors: Mikhailov V V , Aleksandrin S Y , Koldobskiy S A , Boezio M , Munini R , Ngobeni M D , Aslam O P M , Potgieter M S 
Published: December 2020

Abstract
The PAMELA experiment with magnetic spectrometer operated almost ten years on board of the Resurs DK1 satellite. The satellite was launched on 15 June 2006 on polar orbit with an inclination of 70° and an altitude of 350–610 km. The spectrometer continuously measured charged cosmic ray particles in wide energy range from about 50 MeV up to several TeV. In this work the spectra of electrons and positrons averaged over one year were obtained from July of 2006 until January 2016, i.e. from the end of 23th and at the beginning of 24th solar cycle including the period of interplanetary magnetic field polarity reversal. These precise long duration time-dependent measurements of the electron and positron spectra are important to estimate possible contributions of exotic cosmic ray sources such as dark matter annihilation or decay.