bluuebunny/crossref_metadata_2025 huggingface dataset:
Error estimation of the multi-angle phase triangulation method for measuring the three-dimensional geometry of convex and extended objects
Authors: Dvoynishnikov S V , Chubov A S , Pavlov V A , Bakakin G V
Published: December 2020

The work describes the estimation of the error of the multi-angle phase triangulation method for measuring the three-dimensional geometry of convex and extended objects. Theoretical estimates of the measurement error are made and the results of mathematical modeling are presented. It is shown that if the measurement error by the phase triangulation method has normal distribution, the results of stitching a three-dimensional surface will also have a normal distribution with similar characteristics.The multi-angle phase triangulation method for measuring the three-dimensional geometry of convex and extended objects provides the necessary level of measurement accuracy and can be used to obtain the three-dimensional geometry of complex-shaped convex and extended objects in industrial conditions.
Approbation of the Laser Doppler Anemometer Lad-08 on the Secondary Standard Test Rig for Air Flow Speed
Authors: Kabardin I K , Meledin V G , Dvoinishnikov S V , Pavlov V A , Bakakin G V , Samoilenko A I , Inshakov S I
Published: December 2020

In the field of fundamental metrology and ensuring the unity of measuring instruments, the role of optical information methods, systems and technologies of non-contact diagnostics of dynamic processes is extremely relevant. The profiles of the axial velocity component were measured in the working section of the secondary standard test rig for air flow speed. The flow kinematics inside the working section is studied using a laser Doppler anemometer (LDA) with an adaptive temporal selection of the velocity vector (LAD-08).
The numerical study of the fluid flow along a superhydrophobic textured surface
Authors: Lobasov A S , Minakov A V
Published: December 2020

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
From thin to thick domain walls: An example of the φ
8 model
Authors: Blinov Petr A , Gani Vakhid A , Marjaneh Aliakbar Moradi
Published: December 2020

We demonstrate that for some certain values of parameters of the (1 + 1)-dimensional φ
8 model, the kink solutions can be found from polynomial equations. For some selected values of the parameters we give the explicit formulas for the kinks in all topological sectors of the model. Based on the obtained algebraic equations, we show that in a special limiting case, kinks with power-law asymptotics arise in the model, describing, in particular, thick domain walls. Objects of this kind could be of interest for modern cosmology.
QCD corrections for double charmonia production in e+e− annihilation
Authors: Berezhnoy A V , Belov I N , Onishchenko A I
Published: December 2020

We discuss J/ψ ηc
production in e
+
e
− annihilation at next-to-leading order of pQCD. We are focusing at virtual Z
0 contribution into this process: the interference between virtual photon and Z
0-boson is required for careful study. Cross-sections behavior at high energies is studied. At energies ~ M
Z0 the NLO contribution enhances cross-sections up to 2 times.
Identical pion and kaon femtoscopy in EPOS 3 with and without the hadronic afterburner UrQMD
Authors: Batyunya B , Malinina L , Mikhaylov K , Rogochaya E , Romanenko G , Werner K
Published: December 2020

Femtoscopy is an effective instrument to study the size and dynamics of the system created in heavy-ion collisions. In particular, a decreasing dependence of system size on increasing pair momentum and particle mass could be interpreted as an evidence of the strong collective flow. Such phenomena are naturally modeled by hydrodynamics. The large data sample collected in Pb–Pb collisions at

s

NN

=
2.76

TeV

by the ALICE collaboration enables femtoscopic measurements for pions and kaons. In this paper, the ALICE data are compared with calculations within the EPOS 3 hadronic interaction model, which is based on a (3+1)D viscous hydrodynamical evolution and employs the UrQMD cascade to describe the hadronic phase. The femtoscopic radii for pions and kaons are considered as a function of pair transverse momentum/mass and collision centrality. The obtained results show the importance of the hadronic rescattering phase at LHC energies.
Special dyon-like black hole solution in the model with two Abelian gauge fields and two scalar fields
Authors: Belissarova F B , Boshkayev K A , Ivashchuk V D , Malybayev A N
Published: December 2020

Dilatonic black hole dyon-like solution in the gravitational 4d model with two scalar fields and two 2-forms, governed by two 2-dimensional dilatonic coupling vectors

λ
→

i

obeying

λ
→

i

(

λ
→

1

+

λ
→

2

)
>
0

, i = 1, 2, is found. Some physical parameters of the solutions are obtained: gravitational mass, scalar charge, Hawking temperature, black hole area entropy and parametrized post-Newtonian (PPN) parameters β and γ. The PPN parameters do not depend on the coupling vectors

λ
→

i

. A bound on the gravitational mass is proved.
Scientific Data Lake for High Luminosity LHC project and other data-intensive particle and astro-particle physics experiments
Authors: Alekseev A , Kiryanov A , Klimentov A , Korchuganova T , Mitsyn V , Oleynik D , Smirnov A , Smirnov S , Zarochentsev A
Published: December 2020

The next phase of LHC Operations – High Luminosity LHC (HL-LHC), which is aimed at ten-fold increase in the luminosity of proton-proton collisions at the energy of 14 TeV, is expected to start operation in 2027-2028 and will deliver an unprecedented scientific data volume of multi-exabyte scale. This amount of data has to be stored and the corresponding storage system should ensure fast and reliable data delivery for processing by scientific groups distributed all over the world. The present LHC computing and data processing model will not be able to provide the required infrastructure growth even taking into account the expected hardware technology evolution. To address this challenge the new state-of-the-art computing infrastructure technologies are now being developed and are presented here. The possibilities of application of the HL-LHC distributed data handling technique for other particle and astro-particle physics experiments dealing with large-scale data volumes like DUNE, LSST, Belle-II, JUNO, SKAO etc. are also discussed.
Atomic effects in reactor antineutrino spectra calculation
Authors: Lomonosov A , Titov O
Published: December 2020

To predict and interpret the results of reactor antineutrino experiments, precise theoretical knowledge of the antineutrino spectrum is needed. Reactor antineutrinos are produced in beta-decay of fission products, so, in general, any correction to individual beta-spectra will show up in the resulting antineutrino spectrum. We discuss the influence of atomic effects on reactor antineutrino spectra. We note that these effects may be particularly important for the conversion method, which is based on the transformation of experimental electron spectra.
Based on J2EE Research and Realization of National Fitness Sports Convenience Service Platform
Authors: Fang Wu
Published: December 2020

The concept of the national fitness convenient service platform for further study, combined with the current needs, design the convenient universal mobile end the development environment and development tools, at the same time, this paper expounds how to set up the national fitness convenient service platform of mobile terminal development environment, function classification of fitness service platform, each module development mode, the overall framework design.
Application and Analysis of Modern Information Technology in Fine Management of Hospital Medical Insurance
Authors: xunqi Quan , Fangli Dai
Published: December 2020

with the continuous development of science and technology and the arrival of the information age, modern information technology is more and more widely used in the fine management of hospital medical insurance. The importance of hospital medical insurance fine management can solve the problems and shortcomings of traditional human management hospital medical insurance and realize the fine management of medical insurance control fee. Therefore, it is necessary to pay more attention to the application of modern information technology in the fine management of hospital medical insurance, clarify the problems and shortcomings in the current application of information technology, and take targeted measures to solve them. Give full play to the role and value of modern information technology carrier, promote the sustainable and stable development of hospitals. Modern information technology has been continuously applied, which plays a key role that can not be ignored and greatly improves the overall quality of hospital medical insurance. This paper objectively analyzes the importance and effective way of applying modern information technology in the fine management of hospital medical insurance from different angles.
Impulse Noise Suppression based Iterative Hybrid Nonlinear in Power Line Communication
Authors: Teng Deyang , Zheng Yanxi , Zhang Kai , Zhao Shilin , Zhang Hairong
Published: December 2020

In power line orthogonal frequency division multiplexing (OFDM) communication systems, the presence of impulse noise can seriously affect system performance. One of the conventional solutions is to perform a mixed nonlinear processing on the time domain signal at the receiving end before performing subsequent OFDM demodulation. Therefore, this thesis studies an improved method based on iterative elimination of nonlinear distortion. Firstly, the received OFDM signal is subjected to hybrid nonlinear processing in the time domain. Secondly, the nonlinear distortion introduced by the time domain nonlinear processing is reconstructed by the symbols initially detected in the frequency domain, and the reconstruction accuracy is improved by iteration. Finally, the reconstructed nonlinear distortion is subtracted from the output of the hybrid nonlinear processing unit. The simulation results show that compared with the traditional hybrid nonlinear method, the performance of the proposed algorithm is much better than that of the traditional algorithm.
Research on coal mine safety monitoring data storage based on HBase
Authors: Jiang Lizheng , Li Yanbin
Published: December 2020

In order to solve the problem of low storage efficiency and slow query speed when massive coal mine safety monitoring data is stored in relational database, a method of storage and retrieval based on HBase was designed. By combining the hash value of the combination of coal mine code, substation code and transducer code as well as the timestamp after inversion, the hot spot and data skew caused by the unreasonable design of rowkey in HBase were avoided. In order to improve the efficiency of data storage, the swing door trending (SDT) algorithm was used to compress the monitoring data, and in order to improve the efficiency of data retrieval, a secondary index based on ElasticSearch was constructed. The experimental results on the real coal mine data show that the efficiency of data storage and retrieval has been significantly improved.
Research on information system risk Assessment Based on Improved AHP-Fuzzy theory
Authors: Peisheng Liu , Yunping Han , Xiaole Zhu , Shunshun Wang , Zhenglin Li
Published: December 2020

Aiming at the problem of security of information systems, a security risk assessment model based on improved AHP-fuzzy theory is proposed. First, the evaluation index system is constructed by using the Delphi method. Second, the improved AHP method is used to calculate the weight of the index system. On this basis, the multilevel fuzzy comprehensive evaluation model is constructed for risk assessment. Finally, taking an OA system in a university as an example, the empirical analysis is carried out. The result shows that the method proposed in this paper is accurate, effective and time-saving. The study will provide a new method for a risk assessment of information systems.
A Safety Quota-variable Mail Transfer Protocol under Isolated Environment
Authors: Zhang Jiangli
Published: December 2020

The information security problems of e-mail have become a major threat of the network information security in recent years. In this paper, we did deeply analyze on the principles and safety of the protocols of e-mail system, such as SMTP and ESMTP. An improved protocol based on SMTP and ESMTP was proposed, and protocol mode was designed as well. The protocol was denominated as Safety quota-variable Mail Transfer Protocol (SVMTP) under isolated environment. The results show that svmtp protocol has more obvious effect in blocking suspicious connections, security classification and minimizing the waste of communication resources.
A Privacy Preserving Network Coding Signature Scheme Based on Lattice
Authors: Wu Bin , Wang Caifen
Published: December 2020

Network coding is a desirable method to optimize network throughput and improve routing reliability, and is widely used in distributed Internet of Things systems. However, the packet mixing characteristic of network coding makes the transmission vulnerable to pollution attacks, which may hinder the reconstruction of the original data. Moreover, network coding has the potential to resist privacy threats such as eavesdropping attacks since intermediate nodes encourage coding / mixing operations, however, once adversary collects enough packets, simple network coding deployment can not achieve this purpose. In this paper we first present a privacy-preserving network coding signature scheme using lattice theory, which can be viewed as a promising tool for designing post-quantum cryptographic protocols. We blind the global coefficient matrix by encrypting the original encoding vector so as to resist eavesdropping attack, while preventing both intra/inter-generation pollution attacks by simultaneously signing the data packet and the generation identifier. We showed that our scheme is correct, and also proved that our scheme is secure against both eavesdropping and pollution attacks under the security of pseudo-random function and the small integer solution (SIS) assumption in standard lattices.
An improved feature matching ORB-SLAM algorithm
Authors: Li Qiang , Kang Jia , Wang Yangxi , Cao Xiaofang
Published: December 2020

To solve the problems of low accuracy and poor real-time performance in traditional mobile robot vision simultaneous positioning and map construction (SLAM), the original algorithm was improved. First, the ORB features of adjacent images are extracted, and the PROSAC algorithm is used to achieve feature point matching. At the same time, the PROSAC algorithm is improved and optimized, and the execution time of the optimized PROSAC algorithm is significantly reduced; finally, based on the graph optimization model, a global Bundle Adjustment algorithm based on the largest common-view weight frame is proposed to achieve dense and sparse map creation. The algorithm is verified by Tum data set, and the experiment shows that the root mean square error has dropped significantly. The results on the data set effectively prove the effectiveness of the algorithm in this paper.
Application of artificial intelligence based on machine learning
Authors: Chen Xue , Xu Shiyuan , Cao Yibo , He Jiahuan , Jiao Yang
Published: December 2020

In recent years, China’s science and technology is developing rapidly, and has made a lot of achievements in the field of high-tech, which greatly promotes the improvement of China’s national economy and the improvement of people’s daily life quality. Computer information technology is one of the most important modules in the development of science and technology. The traditional computer information technology has effectively improved the efficiency of people’s production and life, and played a good bridge role in the communication between people. However, in view of the current development of electronic information technology, the traditional computer information technology has been unable to meet the growing needs of people’s computing. Artificial intelligence based on machine learning has gradually stepped into people’s vision and attracted more and more attention. In this paper, the application of artificial intelligence based on machine learning will be discussed and studied in detail from multiple perspectives, so as to better apply artificial intelligence in future life.
Adaptive threshold modeling algorithm for monitoring indicators of power network server based on Chebyshev inequality
Authors: Hu Benran , Li Yanjun , Ren Jiyuan , Li Yiqun
Published: December 2020

The business system server under the IT automation operation and maintenance platform generates massive data samples, based on which the threshold can be set to realize the allocation and management of hardware resources. The traditional threshold selection method is to determine an appropriate threshold based on human experience. If the threshold is too high, it will not play its due role. But if the threshold is too low, it will frequently produce false positives. To solve this problem, an adaptive threshold method based on Chebyshev inequality theory combined with kernel density estimation is proposed to determine monitoring indexes, and a new dynamic implicit threshold model is established to analyse the data generated by the business system server for real-time monitoring and alarm processing. Through the experimental study on the CPU utilization data of the power grid server, lower missing and false positive rate are obtained, which verifies the feasibility and effectiveness of the proposed method.
Research on 6G mobile communication system
Authors: Xu Guangbin
Published: December 2020

6G will have super flexibility in the utilization of time, frequency and space resources. The time slot can be compressed to use the high frequency band more effectively and meet the demand of delay sensitive service. Terahertz frequency band is used to make up for the current shortage of spectrum resources. The 6G system will adopt the technical architecture of multi frequency close integration and no cellular cell communication network in air, sky and ground areas. 6G system will realize the integration of network and intelligence, communication and sensor, and adopt novel discontinuous communication technology, wireless power transmission and energy harvesting technology, so as to access all people, information and goods with ultra real experience, and completely eliminate the restrictions of working place and time.
Research on the Influence of Online-shopping Additional Reviews on Product Sales of Search Commodity and Experience Commodity
Authors: Zhang Xintong , Zhang Chong , Wang Jingyi
Published: December 2020

This paper explored the impact of online-shopping additional reviews on sales of search and experience commodity from five perspectives: proportion, length, emotional attitude tendency and time interval. The result shows that the proportion, length, and the emotional attitude tendency of the online-shopping additional reviews have a positive impact on both sales of search commodity and experience commodity. What is more, the number, length and the emotional attitude tendency of online-shopping additional reviews have a larger impact on the sales of experience commodity.
Research on the Innovation of Multimedia Technology and Visual Communication Technology
Authors: Jiang Bian , Qing He
Published: December 2020

Visual communication technology is widely used in the field of design. With the continuous advancement of science and technology, multimedia technology in China has also made great progress. The application of multimedia technology to visual communication technology is of great significance. Only by combining the two ingeniously and actively can it ensure the long-term development of visual communication technology and vitality. Based on this, this article will briefly describe the concept of multimedia technology and visual communication, analyze the impact of multimedia on visual communication technology, and propose innovative strategies for multimedia and visual communication technology for reference.
A Hybrid Deep Learning and Handcrafted Features based Approach for Thyroid Nodule Classification in Ultrasound Images
Authors: Xie Jiahao , Guo Lehang , Zhao Chongke , Li Xiaolong , Luo Ye , Jianwei Lu
Published: December 2020

With the increasing incidence rate of thyroid cancer, the diagnosis of thyroid nodules has become an important task. In this paper, we designed a deep neural network (DNN) to classify whether a thyroid nodule is benign or malignant, and proposed a structure which combines local binary pattern (LBP) with deep learning. Our method mitigates the effects of overfitting in medical image diagnosis tasks. With well-designed transfer leaning, we achieve an accuracy of 85% on our own ultrasound thyroid dataset. To ensure the reliability of our experiments, all examples are estimated by experts in Shanghai Tenth People’s Hospital using fine needle analysis (FNA), which is a gold standard for thyroid nodules diagnosis. The experimental results show that combinations of the traditional medial image features can help the deep learning network get more semantic information from low-level inputs.
Deep Residual Fusion Network for Single Image Super-Resolution
Authors: Wang Jia , Lan Chuwen , Gao Zehua
Published: December 2020

Convolutional neural networks have been applied in the field of single-image super-resolution (SISR) and have achieved a series of outstanding results. However, most of the SISR research still attempt to pursue wider and deeper network structure, without paying enough attention to the correlations between different features. In order to solve these problems, deep residual fusion network (DRFN) is proposed for more powerful feature expression and feature learning. Specifically, we propose a feature fusion group (FFG) structure, which can effectively use the relevant features extracted from the residual attention group (RAG) and fuse them to be more discriminative. Residual attention group (RAG) includes channel attention module (CAM) and spatial attention module (SAM), which uses attention mechanism to refine features. DRFN also makes full use of nested residual connections, skipping redundant low-frequency information to enhance circulation, thereby focusing the calculation on more important high-frequency components. Extensive experimental results have proved the effectiveness of our model. And our model finally achieves excellent performance in terms of both quantitative metrics and visual quality.
Design and Implementation of virtual simulation experiment platform for computer specialized courses
Authors: Song Guanghui , Nie Yan , Chen Genlang , Tong Youcheng
Published: December 2020

For the practical teaching of computer specialized courses in colleges and universities, this study proposes the construction method of virtual simulation experiment platform based on OpenStack, Docker, Seafile and Raspberry Pi, and on this basis, deeply discuss the design and implementation details of the course experiment. The construction and application of virtual simulation experiment platform change the traditional teaching method fundamentally, reduce the cost of laboratory construction and management, which have important reference value to realize the remote experiment teaching. The virtual simulation experiment platform is composed of four parts: virtual machine, application container, cloud storage and client, which can meet the daily teaching needs, cultivate students’ interest in learning, and improve their innovation ability.
Nonuniformity Correction Design and Implementation for Infrared Image Based on FPGA and Artificial Neural Networks
Authors: JunLu YuYang
Published: December 2020

Infrared imaging technology is widely used in military and civilian applications. However, due to the materials and manufacturing technology, the response of each unit in the infrared detector is not completely consistent, which leads to the nonuniformity of the infrared focal plane array. In this article, we propose a way to use artificial neural network by self-adaptively updating the correction coefficients based on FPGA. Compared with traditional calibration-based method, our method is more flexible and can avoid the effects of temperature drift efficiently.