bluuebunny/crossref_metadata_2025_split huggingface dataset:
The numerical study of the fluid flow along a superhydrophobic textured surface
Authors: Lobasov A S , Minakov A V 
Published: December 2020

Abstract
A superhydrophobic phenomenon during fluids flow through microchannel due to the presence of the textures on the walls of the channels was considered. A numerical study of fluids flow and mixing in the microchannel at different Reynolds numbers and average roughness sizes has been carried out. The shift in the critical Reynolds number of the transition from the vortex symmetric flow regime to the vortex asymmetric (engulfment) regime towards lower values in the T-shaped microchannels with textured walls was found. The substantially unsteady structures in the straight microchannels with textured walls at Reynolds numbers of about 1000 were obtained.
A presentation method of the thermophysical properties of matter in the form of spreadsheets
Authors: Ramazanov E R , Kosoy A A , Khalife H 
Published: December 2020

Abstract
The research of methods to reduce CO2 emissions into the atmosphere has led to formation of new thermodynamic cycles in which oxygen is separated from the air before combustion. Fuel, pure oxygen and some recirculating substances, from which it is easy to separate CO2 formed during the combustion, are fed into the combustion chamber. Usually, CO2, H2O or a mixture of thereof are used in the form of recirculated flue gas. The parameters in such cycles are chosen at different points in the cycle, where the working fluid can be in liquid, gaseous or supercritical states. The computational study of such cycles requires a convenient presentation of the thermophysical properties of different substances that can be part of the working fluid in a wide range of parameters. The aim of this work is to develop a data array and a computational module (spreadsheet) considering the dependence of the basic thermophysical properties of various substances. A conversion method of variables that allowed the formation of a compact interpolation grid with minimal loss of accuracy during subsequent interpolation was proposed, where the use of integers for the nodal values of the independent variables saved computational resources during interpolation significantly.
Experimental evaluation of the temperature of inductively coupled water vapor plasma using the Fourier law
Authors: Savenko R A , Medvedev R N 
Published: December 2020

Abstract
The paper presents the results of experimental evaluation of the temperature of inductively coupled water vapor plasma using the Fourier law. The power of the inductive discharge is in the range from 1280 to 2800 W at a frequency of 40 MHz and a pressure from 1 to 5 mbar. The temperature values are found to be from 2.4 to 2.8 kK. Plasma temperature evaluation is verified on the Balmer hydrogen series using relative intensities method. It is shown that in this pressure range, the plasma is not in equilibrium and at a power of 1650 W, the resulting temperatures Tαβ, Tαγ, and Tβγ are 3500 K, 2200 K, and 1200 K, respectively, while the temperature obtained by the Fourier method for the same power is 2500 K.
Test of liquid metal lithium capillary-porous system with stationary plasma in PLM device
Authors: Budaev V.P. , Fedorovich S.D. , Lublinsky I.E. , Vertkov A.V. , Karpov A.V. , Gubkin M.K. , Van Oost G. , Martynenko Yu.V. , Frick P.G. , Sviridov E.V. , Gerasimov D.N. , Lubenchenko A.V. , Zakharenkov A.V. , Marchenkov A.Yu. , Lukashevsky M.V. , Voinkova I.V. , Lazukin A.V. , Konkov A.A. , Rogozin K.A. , Vasiliev G.B. , Zakletsky Z.A. 
Published: December 2020

Abstract
Lithium capillary-porous system (CPS) as a mat between molybdenum grids fixed in a molybdenum module was tested in PLM plasma device for 3 hours in a steady state helium discharge with plasma parameters relevant to scrape-off-layer and divertor plasma of large tokamak. The plasma load on the CPS was of 1 MW / m2 led to surface heating up to 700 °C and vaporization of lithium to plasma. Lithium ions was registered by optical emission spectra from plasma. The redeposition of vaporized lithium was detected on the PLM in-vessel components. Inspections of CPS modules after plasma irradiation did not reveal any damage of molybdenum grids.
Z-Pinch Study with Discharge Initiation by an Electron Beam
Authors: Drozdovsky A A , Sasorov P V , Bogdanov A V , Gavrilin R O , Drozdovsky S A , Kantsyrev A V , Karpov M A , Panyushkin V A , Roudskoy I V , Savin S M 
Published: December 2020

Abstract
We study the gas discharge process under conditions when a relativistic electron beam is injected into the discharge tube after applying a high-voltage pulse. As a result, a plasma channel is created, a breakdown occurs, and a discharge develops. Comparative experiments were performed at different gas pressures under discharge conditions with and without electron beam initiation. They showed significant differences, especially during pinching and further development of the discharge.
Helium accumulation in tungsten layers deposited in Ar-He magnetron discharge
Authors: Krat S. , Fefelova E. , Prishvitsyn A. , Vasina Ya. , Harutyunyan Z. , Gasparyan Yu. , Pisarev A. 
Published: December 2020

Abstract
W-He co-deposition was studied by means of in-vacuo thermal desorption spectroscopy. W-He co-deposited layers were produced at substrate temperatures varied from 400 K to 800 K with a 50 K temperature step. It was found that the He content decreases from ∼1.7 at. % at 400 K to ∼0.17 at. % at 750 K. At 800 K, an increase in the He content was observed, that should be caused by significant changes in the film structure. Helium TDS spectra had two main peaks with maxima in the 500-600 K range and at ∼960 K; the peaks observed are similar to those previously seen for He ion implantation in W. Several scaling expressions are proposed for He/W vs. T.
Fractional values of orbital angular momentum in problems of classical physics
Authors: Krylov K S , Mur V D 
Published: December 2020

Abstract
Classical field theory problems for which the presence of nontrivial topological Pauli phase is essential (i.e. fractional values of the orbital angular momentum are possible in two-dimensional case) are discussed within the two-dimensional Helmholtz equation. As examples, we consider the “wedge problem” — determination of the field created by a point charge placed between two conducting half-planes — and the Fresnel diffraction from knife edge.
Mathematical model and stability investigation of plasma equilibrium around a current-carrying conductor
Authors: Brushlinskii K V , Stepin E V 
Published: December 2020

Abstract
Magnetic Galatea-traps with current-carrying conductors immersed into the plasma are permanent topics of theoretical, experimental and numerical investigations in the controlled thermonuclear fusion field. Our paper presents a mathematical model of equilibrium magnetoplasma configurations around a straight conductor non-contacting with it. Some necessary regularities in the connection between quantitative characteristics of configurations are established. Problems on their MHD stability are set up and partially solved.
A mathematical method for the classification of promoter sequences from the A.thaliana genome
Authors: Korotkova M.A. , Kamionskya A.M. , Korotkov E.V. 
Published: December 2020

Abstract
A mathematical method for creating classes of promoter sequences has been developed. The method was used to calculate the classes of promoter sequences from the A.thaliana genome. A total of 16 statistically significant classes of promoter sequences were obtained with class sizes ranging from 8,000 to 100 promoters. The classes obtained allow us to identify potential promoter sequences in various genomes with the number of false positives not exceeding 103 per genome.
Features of pulsed laser ablation of MoS2 and MoSe2 targets and their influence on the tribological properties of the deposited low friction films
Authors: Goikhman A , Fominski D , Gritskevich M , Romanov R , Fominski V , Smirnov N 
Published: December 2020

Abstract
Laser-initiated modification of the structure and morphology of the MoS2 and MoSe2 targets used to obtain antifriction thin-film coatings by pulsed laser deposition were studied. Significant differences were revealed in the ablation mechanism of these materials that caused important differences in the structure formation of MoS
x
/Mo and MoSe
x
/Mo coatings containing submicro- and nano-scaled Mo particles. Results of the study of structure, morphology and tribological properties of these coatings (coefficient of friction, wear resistance) when testing by the technique of sliding the ball over the covered disk under different air humidity and temperatures are presented. Comparative studies have revealed the superiority of the MoSe
x
/Mo coatings over the MoS
x
/Mo coatings during sliding friction under varying conditions of applications in frictional unites.
Specific heat of refractory carbides (ZrC0.95, HfC0.85 and Ta0.8Hf0.2C) in the temperature interval 2500-5000 K
Authors: Savvatimskiy A I , Aristova NM , Onufriev S V , Valiano G E 
Published: December 2020

Abstract
A fast method for studying the physical properties of substances is considered, -heating by a single current pulse for 5-8 µs. Its advantages over the stationary methods is in obtaining bulk thermophysical properties of carbides at high temperatures (2500-5000 K). The temperature was measured by an optical method using high-speed photo-detectors PDA-10A (Thorlabs) and temperature lamp calibration. There is a sharp increase in the heat capacity of the solid phase for « 300 K before melting for all the studied carbides. It is assumed that the reason for the accelerated growth of heat capacity is associated with the formation of paired Frankel defects, in conditions of insufficient time for saturation of the volume with equilibrium vacancies.
Simulation of the processes of carbon atom and nanographene interaction with a molecule of fullerene C60
Authors: Alyabev D V , Yadgarov I D , Sh Kurbanov M , Ulukmuradov A N , Stelmakh V G 
Published: December 2020

Abstract
The results of numerical simulation of the processes of adsorption of a fullerene molecule by the nanographene edge is presented. It has been found that, as a result of adsorption, the spherical symmetry of the C60 fullerene molecule is broken and this symmetry violation depends on a method of adsorption on the graphene surface. The results of numerical simulation of scattering of carbon atoms and dimers by a C60 fullerene molecule have been also considered. The main goal is to determine the qualitative conditions for encapsulation of carbon atoms inside the fullerene molecule. It has been found that the predominant processes are scattering and adsorption of scattered carbon atoms with a minimal quantity of encapsulated atoms.
Modern mathematical methods for the formation of an optimal set of fulfilled requirements with restriction on resource in big-data analysis
Authors: Fisenko D. G. , Mozgovoy V.S. 
Published: December 2020

Abstract
The article is considered a solution for the mathematical problem for the formation of the optimal set of fulfilled requirements with taking into account the different restriction. The use of the mathematical programming method for solving this problem is demonstrated and the methods for formalizing the conditions of the problem related with certain properties of the requirements under consideration are proposed. The method for analyzing the risks for the generated sets is proposed. The class of problems presented in the article relates to the field of big-data metrology.
Mathematical model of a heat transducer with a cylindrical heat pipeline and with a focused heat source
Authors: Avezova N.I. , Ismatullaev P.R. , Matyakubova P.M. , Kodirova Sh.A. 
Published: December 2020

Abstract
The mathematical model of heat converters with a homogeneous extended cylindrical heat pipe is considered. Based on the developed mathematical models, the main characteristics of thermal converters are analyzed.
Research of a pulse magnetic system for eliminating electron conductivity in an ion diode for the neutron generation
Authors: Vovchenko E.D. , Karimov A.R. , Kozlowskii K.I. , Lisovskii M.I. , Rashchikov V.I. , Shikanova A.E. 
Published: December 2020

Abstract
The work presents the results of modeling the process of suppressing an electronic component in a small-sized coaxial ion diode by a pulsed magnetic field of a spiral electrodynamic line. Information was obtained on the features of this process, which is necessary for designing a diode with pulsed magnetic insulation.
Comparison of molecular dynamics simulation methods of methane shockwave compression
Authors: Kudinov A V , Gubin S A , Bogdanova Yu A 
Published: December 2020

Abstract
Shockwave compression of methane was simulated using the molecular dynamics method with Hugoniostat and MSST approach. The calculation was carried out employing ReaxFFlg potential. We show comparison of simulated Hugoniots for pressure range 0,1-44 GPa and times required for simulation run of two different methods. We also compare two ReaxFF potentials: ReaxFF(2008) and ReaxFF-lg
Photon damping in a strongly magnetized plasma
Authors: Chistyakov M V , Rumuyantsev D A , Yarkov A A 
Published: December 2020

Abstract
The process of propagation of an electromagnetic wave in a strongly magnetized, charge-symmetric plasma is investigated. Taking into account the change in the dispersion properties of a photon in a magnetic field and plasma, it was found that, as well as the case of a pure magnetic field, the process of photon damping in a magnetized plasma has a nonexponential character. It is shown that the effective absorption width of a photon is significantly smaller in comparison with the results known in the literature.
Study of Forbush decreases and lunar cycles effects in the thermal neutron flux registered near the Earth surface by means of “Neutron” setup data
Authors: Bouchama L , Astapov I I , Barbashina N S , Bogdanov F A , Dmitrieva A N , Gromushkin D M , Izhbulyakova Z T , Kovylyaeva A A , Mishutina Yu N 
Published: December 2020

Abstract
The experimental data on thermal neutron flux registered by the “Neutron” setup (MEPhI, Moscow) on the Earth's surface for the period from May 2015 to February 2019 were analyzed. The effects of Forbush decrease (FD) and the lunar cycles were studied. The comparison with the results of FD studies in data of two other setups: the Moscow neutron monitor (MNM) and the muon hodoscope URAGAN (MEPhI, Moscow) was made. Comparison showed that the FD amplitudes of “Neutron” are comparable with those of MNM (on average, less by about 30%), and about 1.5 times more than for MH URAGAN. The counting rate recovery of “Neutron” detectors is much faster than for MNM and MH URAGAN.
Forbush decrease spectrum in a magnetic cloud in the 2004 July 27 event
Authors: Petukhova A S , Petukhov I S , Petukhov S I 
Published: December 2020

Abstract
Magnetic clouds affect the intensity of galactic cosmic rays. The diffusion mechanism is usually used as the formation mechanism for Forbush decrease (FD) in a magnetic cloud (MC). An FD is an observed decrease in the cosmic ray intensity. There is a new theory of FD formation, in which the mechanism is the loss of particle energy in the electromagnetic field of a magnetic cloud. The shape of the FD spectrum is calculated for a wide range of particle energies in the 2004 July 27 event. According to the measurements of ground-based neutron monitors and muon telescopes, synchronous changes in the FD amplitude in time indicate that the FD is formed in a magnetic cloud for all energies. However, the calculated FD spectrum differs from the obtained one from measurements. The reasons for the difference can be: 1) the mechanism of formation is not the electromagnetic one; 2) the method for determining the FD spectrum, using the notion of mean or median energies, needs additional studies.
PROPOSAL: A library to propagate leptons and high energy photons
Authors: Alameddine J-M , Soedingrekso J , Sandrock A , Sackel M , Rhode W 
Published: December 2020

Abstract
PROPOSAL is a Monte Carlo simulation library, usable both in C++ and via a python wrapper, used to describe the propagation of highly energetic particles. Originally designed to provide a precise description of muon and tau propagation, recent updates introduced both photon propagation as well as a more precise implementation of electron and positron propagation. Due to its modular code structure, the user can either use the complete propagation routine provided by PROPOSAL to easily simulate all secondaries created during particle propagation or extract individual parts of the propagation routine to use them in specific applications. Examples of applications of PROPOSAL are its usage in the simulation chain of the IceCube Neutrino Observatory as well as its implementation as an electromagnetic shower model in the upcoming eighth version of the extensive air shower simulation framework CORSIKA. This talk provides a general overview of the functionalities and possibilities of PROPOSAL.
Soft photon study at NICA’s facilities
Authors: Kokoulina E , Barlykov N , Gribovsky A , Dudin V , Dunin V , Kutov A , Nikitin V , Popov V , Ryadovikov V , Shulyakovsky R 
Published: December 2020

Abstract
For over three decades there has been no comprehensive understanding of the mechanism of soft photon (energy smaller than 50 MeV) formation. Experimental data indicate an excess of their yield in hadron and nuclear interactions in comparison with calculations performed theoretically. In JINR, in connection with the building of a new accelerator complex NICA, it has become possible to carry out such studies in pp, pA and AA interactions at energies up to 25 A GeV. We prepared the extensive physical program for soft photons that covers the wide region of investigations in high energy physics. To carry out this program our group develops the conception of an electromagnetic calorimeter on type “shashlik” based on gadolinium-gallium garnet (GaGG) crystals, which have a significantly lower threshold for the registration of photons. The first tests of electromagnetic calorimeters manufactured at the Joint Institute for Nuclear Research on the basis of the GaGG crystals and a composite of tungsten and copper are reported.
Registration of the transition radiation with GaAs detector: Data/MC comparison
Authors: Alozy J , Belyaev N , Bergmann B L , Billoud T R V , Broulim P , Burian P , Campbell M , Chelkov G , Cherry M , Dachs F , Doronin S , Filippov K , Fusco P , Gargano F , Heijne E H M , Konovalov S , Llopart Cudie X , Loparco F , Mazziotta M N , Meduna L , Pernegger H , Ponomarenko D , Pospisil S , Rastorguev D , Rembser C , Romaniouk A , Savchenko A A , Schioppa E J , Smirnov S , Smirnov Y , Smolyanskiy P , Spinelli P , Strikhanov M , Teterin P , Tikhomirov V , Vorobev K , Zhukov K 
Published: December 2020

Abstract
New developments of pixel detectors based on GaAs sensors offer effective registration of the transition radiation (TR) X-rays and perform simultaneous measurements of their energies and emission angles. This unique feature opens new possibilities for particle identification on the basis of maximum available information about generated TR photons. Results of studies of TR energy-angular distributions using a 500 |j.m thick GaAs sensor attached to a Timepix3 chip are presented. Measurements, analysis techniques and a comparison with Monte Carlo (MC) simulations are described and discussed.
Investigation of the radiation hardness of GaAs:Cr semiconductor detectors irradiated with fast neutrons at the reactor IBR-2
Authors: Kruchonak U , Abou El-Azm S , Bulavin M , Chelkov G , Gostkin M , Guskov A , Sheremetyeva A , Zamiatin N , Zhemchugov A 
Published: December 2020

Abstract
Investigation of the semiconductor detectors properties under neutron irradiation is very important for their practical application. High-resistivity gallium arsenide detectors (GaAs:Cr) were irradiated with various fast neutron fluences in range from 3.9×10n cm−2 to 3.7×1016 cm−2 at the IBR-2 reactor, FLNP, JINR. The neutron fluence was measured by placing silicon planar detectors at the measured points and measuring the 1 MeV (Si) equivalent fast neutron fluence. The charge collection efficiency and the current-voltage characteristics of irradiated detectors were measured, and their degradation after neutron irradiation was compared with the results obtained by irradiation with 21 MeV electrons.
Model analysis of relativistic electron beam dynamics in a rarefied plasma
Authors: Barminova H Y , Eshchanova R 
Published: December 2020

Abstract
A mathematical model for describing the nonlinear dynamics of a relativistic electron beam in a rarefied plasma is discussed. The model can be applied for the analysis of the behavior of an electron beam in accelerators, as well as in electromagnetic radiation generators based on relativistic electron beams. The equation for the beam envelope and the results of its numerical solution are presented and shortly discussed.
HADES Forward Wall calibration procedure
Authors: Zherebtsova E , Morozov S , Golubeva M , Guber F , Ivashkin A 
Published: December 2020

Abstract
The Forward Wall (FWall) detector is a segmented scintillation forward hodoscope with PMT readout. The FWall is one of the detector subsystems in the HADES experimental setup at SIS18 (GSI, Darmstadt, Germany) used for determination of the collision centrality and event plane orientation in nucleus-nucleus collisions. The quality of the FWall calibration is a crucial point for these tasks. The HADES experiment on particles production in Ag+Ag reaction at 1.23 and 1.58AGeV has been performed in 2019. FWall calibration was performed for both data sets. In this work the results of the FWall calibration at 1.58AGeV are presented.
Calibration of FHCal with cosmic muons at the BM@N experiment
Authors: Izvestnyy A , Karpushkin N , Guber F , Morozov S , Petukhov O 
Published: December 2020

Abstract
The forward hadron calorimeter (FHCal) is one of the sub-detectors of the BM@N experimental setup at JINR, Dubna. It consists of 54 lead-scintillator “sandwich” type modules of two types with the transverse sizes 20 × 20 cm
2 and 15 × 15 cm
2. These two types of modules are subdivided into 10 and 7 individual longitudinal sections, respectively. Each section provides the independent light and amplitude signal readout with one silicon photomultiplier (MPPC). High signal to noise ratio of MPPC allows to detect cosmic rays with low energy depositions in FHCal longitudinal sections. A method for cosmic muon track reconstruction is discussed. A procedure for energy calibration based on muon track length and energy deposition in each section is proposed. Experimental results of FHCal cosmic calibration are presented.
GPU based photon propagation for CORSIKA 8
Authors: Baack D , Rhode W 
Published: December 2020

Abstract
Right on time for several large-scale experimental upgrades, the widely used and long-standing air shower simulation toolkit CORSIKA 7 will be updated to a “state of the art” C++ simulation framework. To meet the simultaneously rising demand for high-quality air shower simulations and the ecologic necessity to reduce energy consumption several new possibilities for optimizations will be tested.
One of the biggest runtime consumers in the classic simulation is the propagation of fluorescence and Cherenkov photons through the atmosphere. With the rising popularity of highly parallel computing architectures, the runtime of this specific workload can be reduced significantly. In this Work, the most common architecture, in the form of GPUs, is utilized for this task. Two competing implementations in Cuda and OpenCL are compared and different techniques presented that enable a high GPU utilization.