bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of the Azov Sea state based on the Black Sea hydrography
Authors: Mizyuk A I , Lishaev P N , Puzina O S 
Published: December 2020

Abstract
The variability of the Azov Sea is generally determined by the weather conditions formed over the continent. Despite its very small area and depth (can be considered as the shallowest enclosed basin of the ocean), the Azov Sea is an important transport hub. Besides, the large volume of river runoff determines its high fish productivity. A large number of abnormal phenomena have been observed here recently in the context of anthropogenic pressure in the basin. The study represents the intermediate results on the implementation of the data assimilation procedure for possible improvements in the accuracy of the numerical simulation of the basin.
Hardening of steel with a defocused and oscillating laser beam
Authors: Biryukov V. P. , Panov D. V. , Petrovsky V. N. , Ushakov D. V. 
Published: December 2020

Abstract
The paper deals with the process of laser hardening of 40Cr steel samples using fiber laser radiation and transverse sinusoidal beam scanning with a frequency of 200 Hz. A complete factor experiment on laser quenching with changes in the distance from the focal plane, radiation power and processing speed was performed. The regularities of changes in the depth and width of the quenching zones with a defocused and oscillating beam are obtained from the regression equations.
On the proton radiography of magnetic fields in targets irradiated by intense picosecond laser pulses
Authors: Bukharskii N D , Kochetkov Y V , Ehret M , Gubskiy K L , Kuznetsov A P , Santos J J , Zielbauer B , Abe Y , Law F , Korneev Ph A 
Published: December 2020

Abstract
Proton radiography is a common diagnostic technique in laser-driven magnetic field generation studies. It is based on measuring proton beam deflection in electromagnetic fields induced around the target with the help of radiochromic film stacks. Unraveling information recorded in experimental radiographs and extracting the field profiles is not always a straightforward task. In this paper, some aspects of data analysis by reproducing experimental radiographs in numerical simulations are described. The approach allows determining the field strength and structure in the target area for various target geometries.
The physical modelling micro circulatory processes of biological tissues under the low-intensity IR-radiation
Authors: Rozova O V , Stepanov V A 
Published: December 2020

Abstract
A physical modelling of the low-intensity IR-radiation influence on biological tissue was carried out. The deformation processes of biomembrane under the action of a non-uniform temperature field are studied. In addition to wavelength, pulse intensity and frequency the importance of pulse length has been shown for the effectiveness of laser therapy.
Moisture retention influence on the anti-reflection properties of magnetron sputtered Low-E coating stacks with ZnSnOx top layers
Authors: Eremin I , Bernt D , Pisarev A 
Published: December 2020

Abstract
The influence on the optical properties of AR Low-E PVD coatings with silver IR-reflectors on glass substrates from the water absorption into their outer ZnSnOx dielectric layers was considered with the use of VIS/NIR-spectrophotometry. The estimations of coatings absorption shift reversibility depending on the initial contact with water duration as well as of the mechanisms responsible for the changes in optical constants of the stack’s layers, supported with the comparative analysis of experimental and modelled spectra, are reported. It was shown that the water vapour sorption within the top zinc stannate layer leads to the shift in optical qualities of the whole stack by the changes in the stack’s absorption spectrum in the visible range. This effect proved to be reversible with the water exclusion via the samples heat treatment, but only until the water diffusion into the depth of the Low-E stack reaches the Ag layers, propagating the aggregation, that can no longer be cured with the temperature impact. The change in integral visible-range absorption reaches up to ?Avis = 0.5-1 abs.% in comparison to the “as-deposited” samples, suggesting that the presented observations can be employed for VIS/NIR-spectrophotometry of such coatings for the purpose of their initial wetting determination, as well as the control of their further degradation.
Current–voltage characteristics of an impulse magnetron discharge in target material vapor
Authors: Kaziev Andrey V. , Leonova Kseniia A. , Kharkov Maksim M. , Tumarkin Alexander V. , Kolodko Dobrynya V. , Khomyakov Andrey Yu. , Ageychenkov Dmitriy G. 
Published: December 2020

Abstract
The magnetron discharge with hot (uncooled) target in an impulse mode has been experimentally investigated. The I–V characteristics have been measured depending on the magnetic field strength for three target materials: copper, chromium, and silicon. For melted copper and hot chromium targets, stable gasless (no argon) operation of the magnetron has been demonstrated with maximum impulse power densities about 2.5 kW/cm2 (averaged over the racetrack area). For silicon target, maximum impulse power density was 1.5 kW/cm2 at low argon pressure (0.1 Pa). The magnetic field dependences of discharge parameters have shown the associated changes in differential plasma impedance.
Impact of roughness on gas compression in inertial confinement fusion
Authors: Gorodnichev K. E. , Zakharov P. P. , Glazyrin S. I. , Kuratov S. E. 
Published: December 2020

Abstract
The ignition is still unachieved in current schemes of inertial confinement fusion (ICF) despite significant efforts in this direction. The reason for it is unclear as the dynamics of target combine a lot of physical processes that are crucial for successful ignition. One possible limiting factor is known for a long time – hydrodynamic instabilities and mixing. Current work consider the effect of initial roughness on compression efficiency of ICF targets. The roughness is set on the ice–ablator boundary (outer ice interface). First, some analytical results on stability of accelerated perturbed interface are presented. Second, numerical simulations of ICF target show the influence of initial perturbations on hot–spot conditions and ice–ablator mixing.
Two-phonon structure of the neutron-rich nuclei
Authors: Severyukhin A.P. , Arsenyev N.N. , Testov D. 
Published: December 2020

Abstract
Starting from the Skyrme energy-density functional, the microscopic model of the spin-isospin excitations is developed for the β-delayed γ-spectroscopy. We take into account the coupling between one- and two-phonon terms in the wave functions of 1+ states of daughter nuclei. An extension of the two-phonon space allowing for the additional charge-exchange phonons substantially enriches the 1+ spectrum. As an example, the β-decay rates of neutron-rich nuclei 126,128Cd are discussed.
On the stability of the metastable phase of atomic hydrogen
Authors: Degtyarenko N N , Grishakov K S 
Published: December 2020

Abstract
The possibility of metastable hydrogen formation was studied in details using the density functional theory. It was shown that the I41/amd structure of atomic metallic hydrogen could be dynamically stable in the pressure range of 175-500 GPa. The results of calculations of structural, energy characteristics and phonon spectra of the normal phase are presented.
Estimation of electron-phonon coupling constant in Ba1-xKxBiO3
Authors: Lukyanov Alexander E , Neverov Vyacheslav D , Krasavin Andrey V , Menushenkov Alexey P 
Published: December 2020

Abstract
The Holstein model was used to determine the value of electron-phonon coupling in BaBiO3-based compounds in the framework of the dynamical mean-field theory calculations for various levels of doping with potassium. The results obtained characterize the electron-phonon interaction as strong. The phase diagram of the model was calculated with reference to experimental data.
Graphite melting line
Authors: Savvatimskiy A I , Onufriev S V 
Published: December 2020

Abstract
The study was performed to establish a graphite melting line. Bundy’s phase diagrams are presented, in which the melting point of graphite (Tm) does not exceed 5500 K for all the considered pressures, up to (at least) 1 Mbar. The results of several studies on pulsed current heating related to measuring the melting temperature of graphite and obtaining the liquid phase of carbon are discussed. It is indicated that the Tm « 6300 K was obtained at a pulse pressure of 38-50 kbar (estimates) in 1999 year. The results of pulsed heating of graphite with current pulse for 1µs duration and obtaining Tm« 6400 K with calculation of pressure « 3-18 kbar in 2019 are considered. Possible errors of this last experiment are noted.
Levitation properties of pre-magnetized HTS tape stacks
Authors: Starikovskii A S , Osipov M A , Rudnev I A 
Published: December 2020

Abstract
Abstract This study presents new results on investigation of the levitation force between a permanent magnet and pre-magnetized HTS tape stacks containing from 20 to 100 tapes of 12 mm × 12 mm. Stacks were magnetized in superconducting magnet capable of creating a field of up to 8 T and placed in a levitation force measurement system. Experimental data on levitation force value and the effect of lateral displacement on it for stacks of tapes with different values of the captured flux and thickness have been obtained. Levitation force decay during the lateral displacements above a permanent magnet was observed for different stacks.
A pilot study of the behavior of structural materials under powerful pulse influence on the “Calamary” accelerator
Authors: Bobyr N.P. , Kazakov E.D. , Krutikov D.I. , Kurilo A.A. , Orlov M.Yu. , Strizhakov M.G. , Spitsyn A.V. 
Published: December 2020

Abstract
The first studies of two types of structural materials of plasma systems under the in-fluence of a high-current electron beam at the Calamary installation were carried out. Beam exposure parameters close to the emergency modes of some types of plasma systems are selected.
Investigation of the second harmonic influence on focusing of moderate energy protons in travelling wave accelerating structure
Authors: Durkin A. , Kolomiets A. , Paramonov V. 
Published: December 2020

Abstract
For proton acceleration in the traveling wave mode with backward n=-1 spatial harmonic the faster main harmonic n=0, having a larger amplitude, influences on proton beam focusing. In the report an additional focusing by the faster main harmonic n=0 is estimated in acceleration of proton beam with energy above 15 MeV assuming the traveling wave accelerating structure in the S band frequency range.
High-voltage pulse power supply system for klystron in transverse deflecting system of free-electron laser XFEL
Authors: Zavadtsev A , Zavadtsev D , Perevozchikova O , Churanov D 
Published: December 2020

Abstract
The high-voltage pulse power supply system has been built as a part of the transverse deflecting system TDS BC1 designed for electron beam diagnostics in the linear accelerator of the X-Ray Free Electron Laser XFEL. The TDS BC1 includes deflecting structure, solid-state modulator, RF generator with THALES TV2002DOD klystron and pulse transformer, the waveguide system and other engineering subsystems. The results of building and testing of the system are considered. The system was successfully tested on a test stand at DESY with the klystron in diode mode as a load at full design parameters: U=260 kV, I=265 A, τ=6 μs.
Parameters of shock waves during detonation and deflagration of fuel-air clouds
Authors: Sumskoi S I , Sofyin A S , Agapov A A , Kh Zainetdinov S 
Published: December 2020

Abstract
Methods for calculation of shock wave (SW) parameters used in industrial safety to assess the effects of explosions are considered. It is shown that existing methods do not provide the necessary accuracy of calculations. For the correct calculation of wave parameters, it is proposed to use high-accuracy CFD methods. The dimensionless dependences of pressure on distance are obtained for estimation of SW parameters, which allow to improve prediction of the effects of accidental explosions.
Muons with threshold 1 GeV in extensive air showers with energy greater than 5 EeV
Authors: Knurenko S P , Petrov I S 
Published: December 2020

Abstract
The paper presents an analysis of the characteristics of muons with a threshold greater than 1 GeV in showers with energies greater than 5 EeV and zenith angles less than 60 degrees. The analysis is based on the registration data of extensive air showers of the Yakutsk array. Estimation of muons at different distances from the shower core, fraction of muons ρμ
/ρ

μ+e
at a distance of 600 m are obtained. Calculations of the fraction of muons are performed using the QGSjetII-04 hadronic interaction model for different primary nuclei, and compared with the data. Mass composition of primary particles is estimated by muon component. Several showers were found in the sample, with a low content of muons which possibly is produced by ultrahigh energy gamma rays.
Criteria for early prediction of geomagnetic disturbances caused by coronal holes during periods of low solar activity based on muon flux variations
Authors: Osetrova N V , Astapov I I , Barbashina N S , Konovalova A Y 
Published: December 2020

Abstract
Coronal holes generate a high speed solar wind. This wind is the cause of magnetic storms on the Earth during the years of low solar activity. Also a high speed solar wind creates disturbances in the interplanetary magnetic field. The disturbance may reflect cosmic rays hitting them in the direction of the Earth. As a result, it is possible to observe a change in the flux of cosmic rays on the Earth before the arrival of the disturbance. The paper identifies a criterion for early detection of cosmic ray flux increasing by the muon hodoscope URAGAN (MEPhI, Moscow) to coronal holes in years of decreased solar activity (2009-2010, 2018-2019). It was found that increases of cosmic ray intensity are visible before the main sequence of areas of increasing and decreasing cosmic ray intensities in GSE maps in 60% of the cases.
Capabilities of the GAMMA-400 gamma-ray telescope for lateral aperture
Authors: Mikhailova A V , Bakaldin A V , Chernysheva I V , Galper A M , Kheymits M D , Leonov A A , Mayorov A.G. , Mikhailov V V , Minaev P Yu , Suchkov S I , Topchiev N P , Yurkin Yu T 
Published: December 2020

Abstract
The future GAMMA-400 γ-ray telescope will provide fundamentally new data on discrete sources and spectra of γ-ray emissions and electrons + positrons due to its unique angular and energy resolutions in the wide energy range from 20 MeV up to several TeV. The γ-ray telescope consists of the anticoincidence system (AC), the converter-tracker (C), the time-of-flight system (S1 and S2), the position-sensitive and electromagnetic calorimeters (CC1 and CC2), the scintillation detectors of the calorimeter (S3 and S4) and lateral anticoincidence detectors of the calorimeter (LD). To extend the GAMMA-400 capabilities to measure γ-ray bursts, Monte-Carlo simulations were performed for lateral aperture of the one of the versions of GAMMA-400. Second-level trigger based on signals from CC2, LD, S3, and S4 allows us to detect γ-ray bursts in the energy range of ~10-300 MeV with high effective area about 1 m2.
Characteristics of semiconductor pion stop tagging system
Authors: Chernyshev B , Gurov Yu , Lapushkin S , Sandukovsky V 
Published: December 2020

Abstract
A determination of the coordinates of charged particle stops is one of the tasks that have to be solved in a wide class of experiments. A method based on the use of semiconductor detectors (SCD) to determine the stops of particles (muons and pions) was proposed and experimentally tested. The dependence that allows calculating the stopping point of the pions in the tagging system was obtained experimentally. This dependence can be used to optimize the thickness values of monitor detectors.
Neutron-gamma separation study for ZnS(Ag)/6LiF scintillator and silicon photomultipliers
Authors: Chergui A C , Popova E V , Stifutkin A A , Ilyin A L , Bychkova O V 
Published: December 2020

Abstract
Registration of thermal neutrons while simultaneously suppressing or rejecting accompanying gamma-ray background is an important task for many fields. We report on two different experimental neutron-gamma separation studies, utilizing a ZnS(Ag)/6LiF scintillator and pulse height discrimination technique: one is a comparison of the responses of a ZnS(Ag)/6LiF scintillator and a ‘reference’ GAGG(Ce) scintillator when irradiated by gamma sources 137Cs and 241Am; and the second is testing a dual readout, where a photosensor coupled to the ZnS(Ag)/6LiF scintillator screen on each side was irradiated by neutrons (252Cf neutron source). For all measurements the silicon photomultipliers (SiPMs) PM3315-WB-A0 (3x3 mm2 sensitive area, 15 μm cell pitch) manufactured by KETEK were used as a photosensor. High-speed digital oscilloscope LeCroyWR 620zi with a sample rate of 10 GS/s was used as a data acquisition system.
Development of Detector Control System (DCS) for forward hadron calorimeters in the BM@N and the MPD experiments
Authors: Petukhov O , Morozov S 
Published: December 2020

Abstract
The BM@N and the MPD experiments at NICA facility (Dubna, Russia) will use the forward hadron calorimeters (FHCal) for centrality and reaction plane determination in the heavy ion collisions. The FHCal is a modular lead/scintillator sampling calorimeter with longitudinal segmentation. The light from each longitudinal section in module is detected with one silicon photomultiplier (MPPC) with sensitive area of 3x3mm2. In total, the FHCal at the BM@N experiment has 438 readout channels, while two MPD calorimeter arms have 616 readout channels. This article shows the DCS design with hardware and software development for these calorimeters. The DCS will be used to control and correct the bias voltages with temperatures of MPPCs. An integration into the main DCS systems for both experiments are discussed.
Read-out analog channel with interpolator for signal peak finding
Authors: Shumikhin V , Atkin E , Azarov D , Normanov D , Ivanov P , Serazetdinov A 
Published: December 2020

Abstract
A prototype of an analog channel with a digital processing system for reading signals from GEM detectors is presented. Each channel consists of a charge-sensitive amplifier, a shaper, a switch, an amplifier and a 10-bits ADC. The data from the ADC is processed by the digital system based on an interpolator to find signal peaks. The interpolator uses a 6th order Lagrange polynomial. It maintains peak detection accuracy within 1.1 LSB at 25 MHz ADC sampling rate and 270 ns shaper peaking time.
Quark spin densities in the ρ-meson
Authors: Kaur Satvir , Mondal Chandan , Dahiya Harleen 
Published: December 2020

Abstract
We study the correlation between the quark and the spin-1 hadron by evaluating the quark spin densities, specifically for the case of p-meson. The calculations have been performed in the light-front holographic QCD. The overlap representation of light-front wave functions in the holographic QCD has been used to evaluate the leading twist T-even TMDs for ρ-meson. Further, we have evaluated the spin densities via the TMDs in transverse momentum plane.
The strongly intensive observable in pp collisions at LHC energies in the string fusion model
Authors: Vechernin V V , Belokurova S N 
Published: December 2020

Abstract
The properties of the strongly intensive variable characterizing correlations between the number of particles in two separated rapidity interval in pp interactions at LHC energies are studied in the framework of the string fusion model. We perform the MC simulations of string distributions in the impact parameter plane to take into account the experimental conditions of pp collisions. We account the string fusion processes, leading to the formation of string clusters, embedding a finite lattice (a grid) in the impact parameter plane. As a result, we found the dependence of this variable both on the distance between the centers of the observation windows and their acceptance for the minbias pp collisions at several initial energies. Analyzing these dependencies we can extract the important information on the properties of string clusters. We show that in pp collisions at LHC energies the string fusion effects have a significant impact on the behavior of this strongly intensive variable. The role of these effects is increasing with the initial energy and centrality of collisions. In particular, we found that the increase of this variable with initial energy takes place due to the growth of the portion of the fused string clusters in string configurations arising in pp interactions.
BSM contributions to the Zγγ
and ZZγ
self couplings at high energies
Authors: Belyaev N L , Kamaletdinov A H , Soldatov E Y 
Published: December 2020

Abstract
The CP conserving Zγγ
and ZZγ
couplings in the SM and MSSM models at loop level were investigated. For the both models, the coupling parameters

h
3
Z

,

h
3
γ

,

f
5
γ

were estimated for the energy ranges, accessible at the LHC. Extension of the considered energy range up to 14 TeV leads to a possibility to constrain theories by using experimental limits on anomalous couplings from the LHC experiments. It was found that in order to constrain the parameters of the MSSM model, a measurement accuracy of the order of 10−7 is required.
Impact of nuclear density on the mass splitting of the pseudoscalar D meson
Authors: Kumar R , Kumar A 
Published: December 2020

Abstract
We derive the D meson and nucleon interactions from the QCD sum rules. Unifying the chiral SU(3) model, we study the in-medium mass splitting between pseudoscalar D
+ and D
− meson in the hot and dense magnetized nuclear matter. The medium modified quark and gluon condensates are evaluated from the chiral SU(3) model and further plugged into the QCD sum rules to compute the in-medium mass of pseudoscalar D meson. We find that the mass of both

D
+

(
c

d
¯

)

and

D
−

(
d

c
¯

)

meson increase with the medium density. We calculate the D meson mass in centroid approximation and compared it with the mass of D
+ and D
− meson. By plugging the in-medium mass of D
+ and D
− meson in the mass splitting formula,

Δ

m
*

(
=

m

D
+

*

-

m

D
−

*

)

, we observe non-negligible splitting in the D
+ and D
− mass which increases appreciably as a function of nuclear density. The medium modified mass evaluated in this work can be used as an application to study the decay width of higher charmonia states decaying into D
+
D
− pairs.
Corrections of fluctuation observables with the Unfolding techniques
Authors: Prokhorova D S , Andronov E V 
Published: December 2020

Abstract
The paper studies the possibility to correct strongly intensive quantities Δ[PT, N], £[PT, N], and £[NF, NB
] for detector inefficiencies by means of RooUnfold package. Several tests of applying Unfolding technique to 1D- and 2D-dimensional distributions were done on Monte-Carlo generated data in NA61/SHINE acceptance. Results reveal that several aspects of this analysis have to be improved.
Nuclear modification factor in Pb+Pb collisions at

sNN=5.02TeV

using Boltzmann’s Transport Equation with Tsallis statistics
Authors: Pareek P , Tiwari S K 
Published: December 2020

Abstract
In this work the transverse momentum spectra and nuclear modification factor for heavy ion collisions are derived using Tsalllis non-extensive statistics in relaxation time approximation. The Boltzmann-Gibbs Blast Wave (BGBW) function is used as the equilibrium function and Tsallis function is used as the initial distribution function while solving the Boltzmann transport equation in the relaxation time approximation. The framework is used to analyse the experimental data for particles like pions, kaons, protons, D
0 meson and J/Ψ produced in Pb+Pb collisions at

s

NN

=
5.02

TeV

at the LHC, CERN. We find that our proposed equation of state describes the experimental data successfully.