bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical analysis of the bubble-particle interaction in an acoustic field
Authors: Pityuk Yu A , Burmistrov M E , Zarafutdinov I A
Published: December 2020

Features of the interaction of a bubble and a solid spherical particle in the presence of an acoustic field in the three-dimensional case are numerically studied using the boundary element method for potential flow. Multiparametric calculations are presented and dependences of the change in the volume of the bubble, dynamics of the mass center of the bubble and particle on the distance between the objects and their sizes are constructed. It is shown that during the bubble expansion, the particle repels from it, and during the bubble shrinkage it is attracted, the size of the particle determines its mobility. On average, over five periods of acoustic field oscillations, the distance between the objects decreases, which is due to the translational motion of the bubble in the compression phase. The features of the deformation of a bubble located near a solid spherical particle with small amplitudes of the acoustic field are studied.
Volumetric properties of iron in the solid and liquid states
Authors: Abdullaev R N , Khairulin R A , Stankus S V
Published: December 2020

Density and thermal expansion of pure iron are investigated using a gamma-ray at-tenuation technique in the temperature range of 1020–2090 K of solid and liquid states. The relative density changes of iron during allotropic trasformations and solid – melt phase transition are directly measured. The density of iron at room temperature is measured by the Archimedean method. The temperature dependence of the density of iron in the temperature range of 130–2090 K was constructed using the results of this work and a previous study of the thermal expansion of the a-phase. The data of this work are compared with the results of other authors.
Enhancing metal hydride thermal conductivity by forming compacts
Authors: Romanov I A , Borzenko V I , Kazakov A N
Published: December 2020

The development and implementation of metal hydride technologies face a number of challenges. One of the main problems is the low thermal conductivity of fine powders of hydride-forming materials. This feature, giving the relatively high values of the reaction heat of intermetallic compounds with hydrogen, leads to an increase in the cost of construction of vessels with metal hydrides and heat exchangers, which reduces the competitiveness of hydrogen-based technologies. One of the most promising ways to solve this problem today is the formation of compacts from metal hydride powders by pressing with additives that increase thermal conductivity. In this work, compacts based on AB5-type alloy with composition LaNi4.4Al0.3Fe0.3 prepared using various methods were studied and their properties were compared with the free bed of this alloy. Carbon nanofibers and nickel-foam were used as additives that improve the thermal conductivity of the compacts. The main methods of studying the properties of samples were measuring of hydrogen absorption and desorption PCT-isotherms and investigation of the temperature inside the samples during their heating and interaction with hydrogen. The compacts showed a noticeable improvement in thermal conductivity with a slight deterioration in hydrogen-adsorption properties, which is a promising result.
Graphene transfer from a copper surface to a silicon substrate
Authors: Smovzh D V , Kostogrud I A , Boyko E V , Morozova M A
Published: December 2020

The article presents a comparison of two methods of transferring single-layer graphene onto silicon substrates using poly (methyl methacrylate) (PMMA) and thermo-adhesive tape. The continuity of the transferred coating and the quality of the graphene film after the transfer stage were investigated. An analysis of the contaminants formed during the transfer of the graphene surface is carried out. It is shown that when using PMMA for transfer, heating of the samples leads to their damage due to thermal expansion and the formation of indelible impurities on the surface.
Investigation of the influence of low frequency electric fields on model water-in-oil emulsions
Authors: Kovaleva L A , Zinnatullin R R , Sultanguzhin R F
Published: December 2020

The article describes the mechanisms of coagulation and coalescence of emulsion droplets in electric fields, and also defines the frequency ranges at which coagulation and coalescence of emulsion droplets occurs, and the establishment times of these processes. The experiments revealed the tendency to increase the intensity of the studied processes with increasing field strength and salinity of the aqueous phase.
Contact angles in the presence of an electrical field
Authors: Kupershtokh A L
Published: December 2020

Three-dimensional computer simulations of the dynamics of sessile droplets in an electric field and without it are carried out on the basis of the lattice Boltzmann method (LBM). The dielectric droplets are placed on the surface of the lower electrode. The electrical and hydrodynamic parts of the problem are solved simultaneously. After application of an electric field, the droplets begin to lengthen in the field direction. The contact angle is measured after the droplet acquires its equilibrium shape. It is shown that the contact angle slightly increases with increasing the electric field due to electrostatic forces. Above a certain critical value of the electrical Bond number, the droplets cannot acquire a stable form, the elongation becomes unlimited, and the droplets are destroyed.
Experimental study of the temperature distribution over the surface of a heat supply object under heating conditions with a gas infrared emitter
Authors: Kuznetsov G V , Maksimov V I , Nagornova T A , Voloshko I V , Gutareva N Y
Published: December 2020

The experimental studies of the heat transfer processes in the system of radiator – air – heat supply object have been carried out to measure the surface temperatures of the fabric covering the model of the worker. The results obtained give grounds to conclude that when developing systems for ensuring the scheduled thermal regime of the local working zones of the large industrial premises under the conditions of radiant heating, it is necessary to take into account the spatial orientation of the surface areas of the clothing of the worker relative to the vector of the radiant energy flux.
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

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

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

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

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

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

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

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

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

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

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

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 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Nuclear form factor of xenon from photoproduction of vector mesons in Xe-Xe ultraperipheral collisions at the LHC
Authors: Guzey V , Zhalov M
Published: December 2020

Using the Gribov-Glauber model for photon-nucleus scattering and a generalization of the vector meson dominance model for the hadronic structure of the photon, we calculate cross sections of light and heavy vector meson photoproduction in ultraperipheral Xe-Xe collisions at 5.44 TeV at the Large Hadron Collider. Analyzing the momentum transfer distribution in this process, we examine the feasibility to extract the nuclear isoscalar form factor of Xe isotopes, which are needed in searches for dark matter with Xenon-based detectors.
Gravitational lensing by a black hole in non-Riemannian spacetimes
Authors: Zamani S S , Akhshabi S
Published: December 2020

We study gravitational lensing by a black hole in the framework of the poincaré gauge theory of gravity. By using a recent black hole solution in this setup, we derive the deflection angle for light rays grazing the black hole and numerically solve the resulting integral. Numerical result show that the effects of torsion generally increases the deflection angle.
Dynamics of Space at High Energies
Authors: Petriakova P M
Published: December 2020

The dynamics of space endowed by a metric of the 3-dimensional sphere in the framework of f(R)–gravity acting in D = 4 from the creation at high energies is studied. Spaces of finite size are found as a result of exact solution of the classical equations of motion. Generalization of the theory to other dimensions D = 3 and D = 5 are also considered.
CP-sensitive observables for the process pp → Z → ZH → 2e2μ
Authors: Belyaev N , Konoplich R , Prokofiev K , Reese S
Published: December 2020

After the discovery of the Higgs boson at the LHC, additional precise measurements were performed testing its compatibility with the Standard Model (SM). One of the most important deviations from the SM predictions is the possible CP violation in the Higgs sector that may have implications for the origin of the baryon asymmetry in the early Universe. In this paper, new kinematic observables are suggested to probe the CP properties of the Higgs boson. The Higgs boson associated production with a Z boson with a four-lepton final state is studied at theoretical and Monte Carlo levels. Sensitivity of considered observables to the CP nature of the Higgs boson is demonstrated.
Incorporating the Heisenberg and Pauli principles into the kinetic approach to neutrino oscillations
Authors: Kartavtsev A
Published: December 2020

Neutrinos play an important role in the supernovae explosions. The energy transfer from the core to the outer layers depends on the neutrino flavor evolution, affected by collective neutrino oscillations. The latter are damped by kinematic decoherence, developing in the course of the neutrino propagation. The kinematic decoherence caused by dephasing of many neutrinos is readily accounted for in the kinetic approach to neutrino oscillations. We show that the kinematic decoherence caused by dephasing of momentum modes of the neutrino wave-packets can also be accounted for in the kinetic approach through a choice of the initial conditions consistent with the uncertainty principle. According to the existing estimates, this effect may have a substantial impact on the phenomenology of supernovae neutrinos.
Tidal forces near a black hole with scalar hairy
Authors: Andre E L , Potashov I M , Tchemarina Ju V , Tsirulev A N
Published: December 2020

We deal with static, asymptotically flat, spherically symmetric black holes supported by a minimally coupled scalar field with an arbitrary self-interaction potential. We consider a scalar black hole as a simple model of supermassive black holes in the centers of galaxies surrounded by dark matter. Both the radius of the innermost stable circular orbit and the event horizon radius of such an object are less than those of a Schwarzschild black hole with the same mass. Moreover, they can be arbitrary small, so that tidal forces, acting on a star orbiting a scalar field black hole near its photon sphere, can be extremely large and can disrupt the star. This means, in turn, that tidal effects can play an important role for the interpretation of observations in galactic astrophysics.
Study of charge sharing effect in a GaAs:Cr-based Timepix3 detector
Authors: Rastorguev D , Kozhevnikov D , Smolyanskiy P
Published: December 2020

Hybrid pixel semiconductor detectors find more and more applications in modern experimental physical setups. In particular, pixelated detectors based on GaAs:Cr sensor and Timepix3 chip are used in R&D for a state-of-the-art Transition Radiation Detector prototype at CERN. Motivation and usage aspects for GaAs:Cr-Timepix3 device in the experiment are covered in the talk. Authors” contribution to the work of the research group is a study of charge collection and transportation processes in the sensor including fluorescence and so-called charge sharing effect. These are able to significantly affect both spatial and energy resolution of the system. Estimates for the effects are obtained via numerical modelling and then used to analyze the impact on the detector performance.
Research on Optimal Layout of the Mobile Project Department based on Internet technology
Authors: Wang Shao-rui , Wang Kang-nan , Yuan Li , Bai Wen-qi , Ma Zhi-hua
Published: December 2020

Diversified mobile project department layout has a positive impact on the formation of a guiding design of scheme. In this paper, the parametric analysis of design elements are carried out. And the random of generations and optimization of the schemes are simulated by Grasshopper and Excel. Firstly, the initial parameter input options are set. After the size of each partition is limited, the random generation is carried out, and the overall layout shape of each partition is recommended forming a variety of design schemes. Finally, the schemes are screened by combining the constraint of conditions, and the scheme is optimized by using the Galapagos genetic algorithm in Grasshopper [1] to generate the final scheme.
The Application of Computer Aided Translation in Practice——Taking the Chinese-English Translation of Tourism Texts in Hetao Region as an Example
Authors: Li Congsen , Zhang Hao
Published: December 2020

This article analyzes the characteristics of the Chinese-English translation of tourist texts in the Hetao region and computer-aided translation. The author combines the practical application strategies of computer-assisted translation, including the pre-translation, the translation matching work, and the post-translation inspection work to study the relevant content in the tourist text examples in the Hetao region. The purpose of this article is to improve the application value of computer-assisted translation and improve the accuracy of translation.
Application of Big Data Analysis in Flood Control of Small Reservoirs -A Case study of Liaoning Province, China
Authors: Chen Xi , Zhang Tong , Zheng Zeyu , Wang Tianran
Published: December 2020

Small reservoirs play an important role in the safety of flood control and economic development. Their operation and management are characterized by a large number of objects and a large amount of information, which requires effective data analysis means support. Based on this, big data analysis technology has been gradually applied and popularized in the operation and management of small reservoirs. In this paper, we first set up a small reservoir flood reporting system based on the data collection and analysis of various aspects such as reservoir capacity, characteristic water level, real-time data of water and rain situation, meteorological data, and presented the results in the paper. Secondly, we analyzed the under-reporting situation during the flood control period of the reservoir, and explored the under-reporting factors and the time when the under-reporting occurred. Finally, we conduct a time series analysis on the situation of water level exceeding the limit of 50 reservoirs during the flood control period, so that we can find the key reservoirs and important time points of flood control more intuitively and provide reference for the smooth development of the management of small reservoirs.
A New Component of Interactive Multi-task Network Model for Emotion-Cause Pair Extraction
Authors: Shan Jingzhe , Zhu Min
Published: December 2020

The task emotional-cause pair extraction (ECPE) is proposed based on the emotion cause extraction (ECE) task. The ECPE task proposes a new two-step frame method: first step is to extract emotion and cause information separately, then the second step is to match the emotional cause pair. Compared to the ECE task, this new research no longer relies on manual annotation of documents. However, the Inter-EC model component for the ECPE task does not fully consider the relevance of sentimental clause and causal clause, and the available context is limited. In this paper, we propose a new extraction component with self-attention for the Inter-EC model, optimizing the interactive multi-task network model. Our approach achieved a good recall score on the ECPE dataset, and the F1 value is slightly better than the baseline.
A summary of the research on the foundation and application of blockchain technology
Authors: Gai Rongli , Du Xiaoyan , Ma Shuya , Chen Na , Gao Shouchuan
Published: December 2020

Blockchain is an emerging distributed database technology. It has the characteristics of decentralization, non-tampering, traceability and final consistency. Blockchain can solve data management problems in untrusted environments. Based on the research and analysis of the blockchain system, this article expounds the application of the blockchain system in the distributed database environment. First, this article introduces the concept of the blockchain system and the classification of the blockchain system from multiple aspects. Then it introduces the data storage technology and data encryption technology adopted by the blockchain system in detail. Finally, the application prospects of the blockchain system in today’s society are introduced.
On-line Dense 3D Reconstruction Method based on ANN us-ing a Single Structured Light Pattern
Authors: Liu Jinbo , Sun Xiaoliang , Wu Jinshui
Published: December 2020

Dense 3D reconstruction techniques to measuring dynamic scenes and deformable objects with little texture have been widely studied for various applications like surface deformation measurement. We assume that the actual situation of scanning is acquiring sequential shape and measuring surface deformation online at the moment when an object deforms under the action of aerodynamic forces. This paper presents such a technique for on-line acquisition of 3D surface data based on a one-shot scanning method that reconstructs 3D shape from a single image where a simple color-coded pattern using de Bruijn sequence is projected onto an object. The proposed approach has advantages that it requires no assumption of global smoothness and continuous surface. To realize 3D reconstruction from a single image, there are sever-al issues to be solved, for example, difficulty on decoding structured light pattern because of influence of chromatic aberration in both projection systems and imaging systems, and difficul-ty on establishing accurate correspondences between projector and camera pixels. This paper describes the solutions of the issues by combining two methods, that is (1) an efficient and robust pattern decoding method based on artificial neural networks (ANN), and (2) a sub-pixel matching method using phase map and multiple view geometry. Furthermore, we adopt some effective strategies to improve algorithm robustness. Practical experiments were carried out to test the accuracy and efficiency of the scanning system in typical configuration. The results show that the scanning system can reconstruct 3D shape on-line in high-resolution with the accuracy of 0.09 mm and efficiency of 10 fps.
Constructing government procurement knowledge graph based on crawler data
Authors: Yaozu Yu , Jiangen Zhang
Published: December 2020

In the public information of government affairs, the public information of government procurement is more and more timely and complete, which makes it possible for the public to have a comprehensive understanding, in-depth analysis and intelligent use of government procurement information. This paper proposes a process for constructing government procurement knowledge graph: obtaining the bid-winning announcement information through web crawler technology, constructing the government procurement ontology by combining the professional knowledge of government procurement and professional standards and norms, and using Protégé, D2rq, Neo4j and other software to realize ontology instantiation, entity extraction, N-Triples storage. The establishment of knowledge graph for government procurement establishes a strong, convenient and efficient foundation for the public to inquire government procurement information, count government procurement content and analyze the relationship between government procurement.
Question Answering System Based on Knowledge Graph in Air Defense Field
Authors: Liuyang Yu , Guo Zhigang , Chen Gang , Zhang Xingxin , Tang Yongwang , Wei Han
Published: December 2020

With the development of artificial intelligence technology, question answering systems based on knowledge graphs (QAS-KGs) have become a prevalent information retrieval approach. However, current QAS-KGs which usually adopt general knowledge graphs have complex algorithms and high requirements for hardware. Moreover, in some specific fields, such as air defense field, the QAS-KGs usually cannot respond accurately and they can only handle questions composed of one language. In this paper, we introduce an efficient QAS-KG approach which can handle questions composed of Chinese, English, or both languages. First, we construct the knowledge graph in air defense field according to the domain characteristics and user needs. Then we design and implement a question answering system based on the knowledge graph. Finally, we test the system on the self-built data set. The results show that the system can understand the user’s intention quickly and make accurate responses without high requirements for hardware.
Research on Cross-network Exchange Method of Enterprise Application Business Process Data
Authors: Feng Xu , Sicheng Tao , Gongliang Li , Yang Xie , Yizheng Tao
Published: December 2020

To solve the problem of efficient, safe and controllable transfer of enterprise-level application systems’ data across network, this paper proposes a data exchange method for application systems across physically isolated networks. Firstly, the analysis of the cross-network data exchange business model and the design of the business scenario were carried out, and two typical cross-network data exchange business models were condensed. Then, the design of the overall scheme and the detailed technical scheme of cross-network data exchange based on the one-way import device was carried out. Finally, the cross-network ferry middleware system was developed, and the experimental environment of the cross-network data exchange system based on the one-way import device was built, the personnel organization and the leave process information ferry across physically isolated networks were achieved, and the feasibility of cross-network data exchange scheme was verified.
Captcha Recognition using convolutional neural networks with low structural complexity
Authors: Yang Haolin
Published: December 2020

CAPTCHAs are automated tests designed to distinguish between humans and computers. They could be easily solved by humans, but they become challenging for machines to solve, therefore preventing programs from abusing online services and occupying internet resources. Using Convolutional Neural Networks, the CAPTCHA tests could be solved automatically at high efficiency. Current approaches of high accuracy CAPTCHA recognition can be structurally complicated. As a result, our team explored a different approach to solve CAPTCHAs using a Convolutional Neural Network that is more efficient in terms of structural complexity and run time, with image processing being a possibility to enhance the accuracy. We also tested our networks on CAPTCHA datasets with character adhesion and background noise.
An Improved Full-text Retrieval for Elementary Education Resource Database System
Authors: Liu Cong , Huai Huai
Published: December 2020

With the rapid development of Internet and information technology, ways of teaching and learning in China’s elementary education have begun to change. In the face of massive resources, how to optimize the searching results and improve users’ satisfaction through the search services, has now become a major priority. Based on the in-depth study of full-text retrieval technology, combined with the actual searching needs of the elementary education resources, this paper focuses on Chinese word segmentation technology, and proposes a user-defined professional dictionary based on cell lexicon. Experiments show that using this professional dictionary to segment words improves the professionalism of word segmentation results and the accuracy of search results. Meanwhile, an improved full-text retrieval for elementary education resource database system based on Lucene is designed and implemented, including resource collection, text pre-processing, content indexing and resource retrieval. This system is successfully integrated and applied to the massive knowledge base platform for elementary education, which meets the needs of full-text retrieval of textbooks and supplementary content, and makes a good effect.