Identification optical characteristics of dust aerosol by remote sensing methods in the infrared region of the spectrum
Identification optical characteristics of dust aerosol by remote sensing methods in the infrared region of the spectrum
A. S. Papkova$^1$, D. V. Kalinskaya$^1$, J. I. Papkova$^2$
Optical characteristics of mineral dust is currently remain uncertain, which proves the need for an analysis of its contribution to the radiation balance and requires a study of the properties of the dust at the regional level. The aim of this work is to determine the optical characteristics of dust aerosol in the long-wavelength spectral region over the Black Sea region, followed by checking the accuracy of the existing algorithms for its identification. AERONET (Aerosol Robotic Network), the international network of ground-based photometers, and CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) remote sensing results were used as a data source. In this paper the following optical parameters aerosol investigated: single scattering albedo (SSA), lidar ratio (Sa), depolarization ratios and aerosol optical thickness (AOT). Based on the value of the dust coefficient (Rd) at 0.53 ≤ Rd ≤ 0.89, the aerosol is mixed dust, at values higher it is pure dust. Depending on the single scattering albedo, absorption is weak when 0.90 ≤ SSA ≤ 0.95; if this indicator is higher, then absorption is strong. Based on many years of statistics, a mixed dust aerosol with weak absorption for the Black Sea region was identified. A comparative analysis of the data from the AERONET and CALIPSO models showed a strong correlation of the results.
Show AbstractA Criterion for the Mass Estimation of the Primary Particles of the Inclined Showers in SPHERE-2 Experiment
A Criterion for the Mass Estimation of the Primary Particles of the Inclined Showers in SPHERE-2 Experiment
V. I. Galkin, E. A. Kobyakova, V. S. Latypova
A new method for the separation of inclined extensive air showers (EAS) according to the their primary particle masses is considered based on the directly measurable characteristics of the lateral distribution (LD) of Cherenkov light (CL) and enabling to attribute the showers to one of the three mass groups in the event-by-event approach in the primary energy range & 10^16 eV. The method is destined for the processing of the inclined EAS events detected by SPHERE-2 experiment. Quantitative characteristics of the universal selection criterion are specified, its weak dependence on the night sky background is stated. The criterion’s quality measures are to be considered as the landmarks for the future work because they are assessed for CL LD at the snowed ground level and thus do not account for the the process of the reflected CL detection by SPHERE-2 telescope. The method might be interesting for the now active and future detector arrays intended for EAS studies using CL.
Show AbstractInvestigation of impact rupture of polymer-tissue composites reinforced with carbon nanotubes.
Investigation of impact rupture of polymer-tissue composites reinforced with carbon nanotubes.
V. A. Kobzev$^{1,2}$, C. N. Gavrilovich$^2$, K. A. Bukunov$^2$, E. V. Anreevna$^2$, A. V. Makunin$^2$, V. Y. Lagutin$^2$
Nanocomposites are a new type of materials that differ from conventional composite materials in the size of the hardening phase. One of the most promising fillers for the manufacture of nanocomposites are carbon nanotubes. The study of structural and functional properties of polymer composite materials based on epoxy resins reinforced with carbon nanotubes. Impact resistance under high-speed impacts of multilayer composites, which are multilayer structures of fiberglass and basalt fabric impregnated with a polymer based on epoxy resins, was studied.
Show AbstractThe study of the 14 MeV neutrons interaction with nuclei C, Mg, Cr
The study of the 14 MeV neutrons interaction with nuclei C, Mg, Cr
I. D. Dashkov$^1$, N. A. Fedorov$^{1,2}$, D. N. Grozdanov$^{2,3}$, Yu. N. Kopach$^2$, I. N. Ruskov$^3$, V. R. Skoy$^2$, T. Yu. Tretyakova$^{2,4}$, F. A. Aliev$^{2,5}$, S. .. Dabylova$^{2,6}$, C. .. Hramco$^{2,7}$, N. A. Gundorin$^2$
This work is dedicated to research of nuclear processes occurring in 𝑛+$^{12}$C, 𝑛+$^{24}$Mg, 𝑛+$^{52}$Cr reactions at energy 14.1 MeV. Nuclear reaction simulation code TALYS was used to reproduce the experimental results gained from TANGRA experiments and other sources. The experimental setup TANGRA (TAgged Neutron and Gamma RAys) for studying neutron-induced nuclear reactions is operated by Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research. It provides experimental data on the angular and energy distributions of gamma quanta emitted from various targets. The results from TALYS calculations in comparison with the experimental data are shown and discussed.
Show AbstractPhysical process control in laser metal deposition technology
Physical process control in laser metal deposition technology
Yu. N. Zavalov, A. V. Dubrov, P. S. Rodin, V. D. Dubrov
The article deals with the control modes of physical processes in the technology of laser metal deposition (LMD). The software and hardware implementation of the LMD process control system with laser power control is presented. The system operates in real time with a control cycle duration of 15 ms and allows one to adjust the laser power set in the controller program. The system can be used not only in laboratory or newly created installations, but also for integration into existing LMD systems. It is shown that the use of pulse-width modulation of the laser power allows one to control the shape of the deposited track. It is also shown that under certain parameters of power modulation, it is possible to increase the cooling rate of the melt while maintaining the track width.
Show AbstractSimulating of B-hadron pairs in pp collisions on the LHC
Simulating of B-hadron pairs in pp collisions on the LHC
I. I. Ovcharov
The b quark pair production hard processes were simulated with PYTHIA 8 event generator. The events corresponding to the pair production of B-hadrons were selected, spectra were obtained for the azimuthal angle in the pair of B hadrons and the transverse momentum of the pair in pp interactions at energies of 7 and 13 TeV for the kinematic regions of the ATLAS and LHCb detectors and various regions with respect to the transverse momentum 𝑝𝑇 .
Show AbstractJet charge measurements in pp collisions at the ATLAS
Jet charge measurements in pp collisions at the ATLAS
I. A. Kochergin
The research of electric charge can provide information about processes of fragmentation and, therefore, can help to calibration the theory of quantum chromodynamics (QCD). The paper analyzes the distribution of the jets that compensate for the production of 𝐵+ and 𝐵− mesons; the prevalence of gluon jets is observed. The results of the analysis are compared with theoretical expectations.
Show AbstractAdaptive regulation of the laser metal deposition process by the optical signal
Adaptive regulation of the laser metal deposition process by the optical signal
Yu. N. Zavalov, A. V. Dubrov, P. S. Rodin, V. D. Dubrov
The features of controlling the parameters of the laser metal deposition process (LMD) by the optical signal are considered. It is shown that to control and manage the process, it is necessary to use the principles of adaptive regulation. A review of research in the field of process control systems for laser metal additive manufacturing has been carried out. The developed system for the on-line control of LMD with feedback on the optical signal from the processing zone is described. The system provides the recognition of deviations during the process in real time and performs corrective actions to maintain the processes in the required regime. The use of the developed control system led to a decrease in the deviation of the track height from the set value on the trajectories with sharp turns.
Show AbstractSystematic uncertainties of experimental cross sections of partial photoneutron reactions: nuclei $^{75}$As, $^{127}$I и $^{181}$Ta
Systematic uncertainties of experimental cross sections of partial photoneutron reactions: nuclei $^{75}$As, $^{127}$I и $^{181}$Ta
V. V. Varlamov$^1$, A. I. Davydov$^2$
The problem of reliability of the photoneutron partial reaction cross sections for $^{75}$As, $^{127}$I and $^{181}$Ta obtained in experiments used the beams of quasimonoenergetic annihilation photons was considered using the objective physical criteria. It was shown that the experimental data for (𝛾, 1𝑛) and (𝛾, 2𝑛) reactions cross sections for three mentioned nuclei obtained using the method of neutron multiplicity sorting are not reliable because contain significant systematic uncertainties. It was found that additionally to uncertainties of unreliable determination of neutron multiplicity basing on its measured energy the significant uncertainties of different nature exist. Using the comparison of experimental cross sections with those evaluated using experimental-theoretical method it was shown that additional uncertainties are due to the loss of noticeable part of neutrons from the reaction (𝛾, 1𝑛) in the cases of $^{127}$I and $^{181}$Ta and from the both (𝛾, 1𝑛) and (𝛾, 2𝑛) reactions in the case of $^{75}$As.
Show AbstractModeling of electron irradiation treatment on kinetics of bacterial content in minced fish
Modeling of electron irradiation treatment on kinetics of bacterial content in minced fish
A. P. Chernyeav$^{1,2}$, V. M. Avdyukhina$^1$, U. A. Bliznyuk$^1$, P. U. Borchegovskaya$^1$, I. C. Gordonova$^3$, V. S. Ipatova$^1$, V. A. Leontyev$^1$, Z. K. Nikitina$^3$, V. V. Rozanov$^1$, F. R. Studenikin$^1$, D. S. Yurov$^2$
This study illustrates the mathematical modeling of the experimental study on the impact of 1 MeV electrons at different doses on the concentration of bacteria in the homogenate of minced trout during 15 days of storage at a temperature of (2-4)◦C. A mathematical model was constructed based on the general predator-prey model, which describes the change in the number of two species of bacterial populations under conditions of a limited nutrient resource over time. This model agrees well with the experimentally obtained dependences of the change in the concentration of viable cells in minced fish homogenate after exposure to accelerated electrons in various doses.
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