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Metadata extraction from raw astroparticle data of TAIGA experiment

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arXiv 2019年

作者： Bychkov, Igor Dubenskaya, Julia Korosteleva, Elena Kryukov, Alexandr Mikhailov, Andrey Nguyen, Minh-Duc Shigarov, Alexey Matrosov Institute for System Dynamics and Control Theory Siberian Branch of Russian Academy of Sciences Lermontov St. 134 Irkutsk Russia Moscow Russia Institute of Mathematics Economics and Informatics Irkutsk State University Gagarin Blvd. 20 Irkutsk Russia

Today, the operating TAIGA (Tunka Advanced Instrument for cosmic rays and Gamma Astronomy) experiment continuously produces and accumulates a large volume of raw astroparticle data. To be available for the scientific community these data should be well-described and formally characterized. The use of metadata makes it possible to search for and to aggregate digital objects (e.g. events and runs) by time and equipment through a unified interface to access them. The important part of the metadata is hidden and scattered in folder/files names and package headers. Such metadata should be extracted from binary files, transformed to a unified form of digital objects, and loaded into the catalog. To address this challenge we developed a concept of the metadata extractor that can be extended by facility-specific extraction modules. It is designed to automatically collect descriptive metadata from raw data files of all TAIGA formats. Copyright © 2019, The Authors. All rights reserved.

关键词： Metadata

Towards the baikal open laboratory in astroparticle physics

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arXiv 2019年

作者： Bezyazeekov, Pavel Bychkov, Igor Budnev, Nikolay Chernykh, Daria Kazarina, Yulia Kostunin, Dmitriy Kryukov, Alexander Monkhoev, Roman Shigarov, Alexey Shipilov, Dmitriy Applied Physics Institute Irkutsk State University Irkutsk Russia Matrosov Institute for System Dynamics and Control Theory Siberian Branch of Russian Academy of Sciences Irkutsk Russia DESY Zeuthen Germany Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics Moscow Russia

The open science framework defined in the German-Russian Astroparticle Data Life Cycle Initiative (GRADLCI) has triggered educational and outreach activities at the Irkutsk State University (ISU), which is actively participated in the two major astroparticle facilities in the region: TAIGA observatory and Baikal-GVD neutrino telescope. We describe the ideas grew out of this unique environment and propose a new open science laboratory based on education and outreach as well as on the development and testing new methods and techniques for the multimessenger astronomy. Copyright © 2019, The Authors. All rights reserved.

关键词： Observatories

Mott dissociation and kaon to pion ratio in the EPNJL model

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arXiv 2021年

作者： Blaschke, D. Friesen, Alexandra V. Yu, L. Kalinovsky Radzhabov, A.E. Joint Institute for Nuclear Research Dubna141980 Russia Institute for Theoretical Physics University of Wroclaw Wroclaw50-204 Poland Moscow115409 Russia Dubna State University Dubna141982 Russia Matrosov Institute for System Dynamics and Control Theory Irkutsk664033 Russia

The behaviour of pseudoscalar mesons within the SU(3)PNJL-like models is considered for finite T and µB. We compare the pole approximation (Breit-Wigner) with the Beth-Uhlenbeck approach. We evaluate the K/π ratios along the phase transition line in the T-µB plane with constant and T/µB-dependent pion and strange quark chemical potentials. Using the model, we can show that the splitting of kaon and anti-kaon masses appears as a result of introduction of density and this explains the difference in the K+/π+ ratio and K−/π− ratio at low √sNN and their tendency to the same value at high √sNN. A sharp "horn" effect in the K+/π+ ratio is explained by the enhanced pion production which can be described by occurrence of a nonequilibrium pion chemical potential of the order of the pion mass. We elucidate that the horn effect is not related to the existence of a critical endpoint in the QCD phase diagram. © 2021, CC BY.

关键词： Hadrons

Unitary quantization and para-Fermi statistics of order two

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arXiv 2017年

作者： Markov, Yu.A. Markova, M.A. Gitman, D.M. Matrosov Institute for System Dynamics and Control Theory SB RAS Irkutsk Russia P.N. Lebedev Physical Institute Moscow Russia Department of Physics Tomsk State University Tomsk Russia Institute of Physics University of São Paulo São Paulo Brazil

A connection between a unitary quantization scheme and para-Fermi statistics of order 2 is considered. An appropriate extension of Green's ansatz is suggested. This extension allows one to transform bilinear and trilinear commutation relations for the annihilation and creation operators of two different para-Fermi fields φaand φbinto identity. The way of incorporating para-Grassmann numbers ξkinto a general scheme of uniquantization is also offered. For parastatistics of order 2 a new fact is revealed, namely, the trilinear relations containing both the para-Grassmann variables ξkand the field operators ak, bmunder a certain invertible mapping go over into the unitary equivalent relations, where commutators are replaced by anticommutators and vice versa. It is shown that the consequence of this circumstance is the existence of two alternative definitions of the coherent state for para-Fermi oscillators. The Klein transformation for Green's components of the operators ak, bmis constructed in an explicit form that enables us to reduce the initial commutation rules for the components to the normal commutation relations of ordinary Fermi fields. A nontrivial connection between trilinear commutation relations of the unitary quantization scheme and so-called Lie-supertriple system is analysed. A brief discussion of the possibility of embedding the Duffin-Kemmer-Petiau theory into the unitary quantization scheme is provided. Copyright © 2017, The Authors. All rights reserved.

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Chiral phase transition and kaon-to-pion ratios in the entanglement SU(3) PNJL model

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arXiv 2020年

作者： David, Blaschke Friesen, A.V. Kalinovsky, Yu.L. Radzhabov, A. Joint Institute for Nuclear Research Dubna141980 Russia Institute for Theoretical Physics University of Wroclaw Wroclaw50-204 Poland Moscow115409 Russia Dubna State University Dubna141982 Russia Matrosov Institute for System Dynamics and Control Theory Irkutsk664033 Russia

Within the three-flavor PNJL and EPNJL chiral quark models we have obtained pseudoscalar meson properties in quark matter at finite temperature T and baryochemical potential µB. We compare the meson pole (Breit-Wigner) approximation with the Beth-Uhlenbeck (BU) approach that takes into account the continuum of quark-antiquark scattering states when determining the partial densities of pions and kaons. We evaluate the kaon-to-pion ratios along the (pseudo-)critical line in the T − µB plane as a proxy for the chemical freezeout line, whereby the variable x = T/µB is introduced that corresponds to the conserved entropy per baryon as initial condition for the heavy-ion collision experiments. We present a comparison with the experimental pattern of kaon-to-pion ratios within the BU approach and using x-dependent pion and strange quark potentials. A sharp"horn" effect in the energy dependence K+/π+ ratio is explained by the enhanced pion production at energies above √sNN = 8 GeV, when the system enters the regime of meson dominance. This effect is in line with the enhancement of low-momentum pion spectra that is discussed as a precursor of the pion Bose condensation and entails the occurrence of a nonequilibrium pion chemical potential of the order of the pion mass. We elucidate that the horn effect is not related to the existence of a critical endpoint in the QCD phase diagram. Copyright © 2020, The Authors. All rights reserved.

关键词： Hadrons

Traffic flow prediction for vehicle emission calculation based on graph convolutional networks 1

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Traffic flow prediction for vehicle emission calculation bas...

1st International Workshop on Advanced Information and Computation Technologies and systems, AICTS 2020

作者： Jiang, Peng Bychkov, Igor Liu, Jun Li, Tianjiao Hmelnov, Alexei Department of Science and Technology Cooperation Westlake University No.18 Shilong Mountain Street Xihu District Hangzhou China "the Belt and Road" Institute for Information Technology Hangzhou Dianzi University No.115 Wenyi Road Xihu District Hangzhou China Hangzhou Dianzi University No.1158 Number Two Street Jianggan District Hangzhou China Matrosov Institute for System Dynamics and Control Theory Siberian Branch Russian Academy of Sciences 134 Lermontov st. Irkutsk Russia

Monitoring the distribution of vehicle exhaust emissions within the city is a very challenging problem since it is affected by many complex factors, such as spatial-temporal correlation and the other environment conditions. In addition, the technology of using sensors to directly monitor vehicle exhaust emissions is still in the initial stage, and it is hard to implement direct monitoring in a large area. Thus, we use the existing environmental theory to measure the distribution of vehicle exhaust emissions in cities by traffic volume. In this paper, the problem we need to solve is how to use the data of sparse monitoring stations and inherent traffic network to infer the spatial-temporal distribution of traffic volume. In order to solve this problem, we propose a graph convolutional network model to extract the characteristics of traffic data and other features. We have done a lot of experiments on real traffic data sets. The experimental results show that the proposed method performs better than the existing methods. © 2021 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

关键词： Flow graphs

Educational and outreach resource for astroparticle physics

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arXiv 2020年

作者： Kazarina, Yulia Khristyuk, Vasiliy Kruykov, Alexander Postnikov, Evgeny Samoliga, Vladimir Shigarov, Alexey Tokareva, Victoria Zhurov, Dmitriy Applied Physics Institute of ISU Irkutsk Russia Matrosov Institute for System Dynamics and Control Theory Siberian Branch of Russian Academy of Sciences Irkutsk Russia Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics Moscow Russia Institute for Nuclear Physics KIT Karlsruhe Germany

The modern astrophysics is moving towards the enlarging of experiments and combining the channels for detecting the highest energy processes in the Universe. To obtain reliable data, the experiments should operate within several decades, which means that the data will be obtained and analyzed by several generations of physicists. Thus, for the stability of the experiments, it is necessary to properly maintain not only the data life cycle, but also the human aspects, for example, attracting, learning and continuity. To this end, an educational and outreach resource has been deployed in the framework of German-Russian Astroparticle Data Life Cycle Initiative (GRADLCI). Copyright © 2020, The Authors. All rights reserved.

关键词： Deep learning

Using the Beth-Uhlenbeck approach to describe the kaon to pion ratio in a 2+1 flavor PNJL model

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arXiv 2019年

作者： Blaschke, D. Friesen, A. Kalinovsky, Yu. Radzhabov, A. Institute for Theoretical Physics University of Wroclaw Wroclaw50-204 Poland Joint Institute for Nuclear Research Dubna Dubna141980 Russia Moscow115409 Russia Matrosov Institute for System Dynamics and Control Theory Irkutsk664033 Russia Irkutsk State University Irkutsk664003 Russia

The kaon to pion ratios are discussed in the framework of a 2+1 flavor PNJL model. In order to interpret the behaviour of bound states in medium the Beth-Uhlenbeck approach is used. It is shown that in terms of phase shifts in the K+ channel an additional low-energy mode could appear as a bound state in medium since the masses of the quark constituents are different. The comparison with experimental data for the ratios is performed and the influence of the anomalous mode to the "horn" effect in the K+/π+ ratio is discussed. Copyright © 2019, The Authors. All rights reserved.

关键词： Hadrons

Optimal control of a population dynamics model with hysteresis

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arXiv 2021年

作者： Timoshin, Sergey A. Bin, Chen Fujian Province University Key Laboratory of Computational Science School of Mathematical Sciences Huaqiao University Quanzhou362021 China Matrosov Institute for System Dynamics and Control Theory Russian Academy of Sciences Lermontov str. 134 Irkutsk664033 Russia

This paper addresses a nonlinear partial differential control system arising in population dynamics. The system consist of three diffusion equations describing the evolutions of three biological species: prey, predator, and food for the prey or vegetation. The equation for the food density incorporates a hysteresis operator of generalized stop type accounting for underlying hysteresis effects occurring in the dynamical process. We study the problem of minimization of a given integral cost functional over solutions of the above system. The set-valued mapping defining the control constraint is state-dependent and its values are nonconvex as is the cost integrand as a function of the control variable. Some relaxation-type results for the minimization problem are obtained and the existence of a nearly optimal solution is established. Copyright © 2021, The Authors. All rights reserved.

关键词： Hysteresis