Currently, a number of experimental facilities for astrophysics of cosmic rays are being built and are already operating in the world. These installations produce large amounts of data that need to be collected, proce...
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Currently, a number of experimental facilities for astrophysics of cosmic rays are being built and are already operating in the world. These installations produce large amounts of data that need to be collected, processed, and analyzed. Since many organizations around the world are involved in experimental collaboration, it is necessary to organize distributed data management and processing. Moreover, the widespread use of multi-messenger approach based on the coordinated observation, interpretation and analysis of disparate signals created by different astrophysical processes makes this problem much more urgent and complex. To meet a similar challenge in high energy physics, a WLCG grid was deployed as part of the LHC project. This solution, on the one hand, showed high efficiency, and, on the other hand, it turned out to be a rather heavy solution that requires high administrative costs, highly qualified staff and a very homogeneous environment on which applications operate. The paper considers a distributed data storage, called AstroDS, which was developed for middle-size astrophysical experiments. The storage currently integrates the data of the KASCADE and TAIGA experiments;in the future, the number of supported experiments will be increased. The main ideas and approaches used in the development of this storage are as follows: unification of access to local storages without changing their internal structure;data transfer only at the moment of actual access to them;search for the requested data using metadata and aggregation of the search results into a new collection available to the user. A distinguishing feature of the system is its focus on storing of both raw data and primary processed data, for example, data after calibration, using the Write-One-Read-Many method. Adding data to local repositories is carried out through special local services that provide, among other things, semi-automatic collection of meta-information in the process of downloading of th
The problem of the influence of forces on stability with respect to equilibrium of satellite with a controlled gravitational stabilizer on the circular orbit is researched. In space of the entered parameters the domai...
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The Baikal-Mongolian region is the territory with high seismic activity for which issues of the dynamic interaction of mobile areas with the platform block at a neotectonic stage. Also, it is a pattern of a late Caino...
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We test a novel idea of using a π- beam in the fixed-target experiments to search for New Physics in the events with missing energy. Bounds for invisible vector ρ meson decay were derived, analyzed, and compared wit...
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In this paper, we develop new methods of local and global search for finding optimistic solutions to the hierarchical problem of optimal pricing in telecommunication networks. These methods are based on the fact that ...
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We discuss recent progress in the development of the three-fluid hydrodynamics-based program THESEUS towards an event generator suitable for applications to heavy-ion collisions at the intermediate energies of the pla...
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The high-performance computing systems include a large number of hardware and software components that can cause failures. Nowadays, the well-known approaches to monitoring and ensuring the fault tolerance of the high...
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The paper is devoted to the study of a singular nonlinear second-order parabolic equation, which is called the porous medium equation or the nonlinear heat equation. One of the important classes of its solutions is he...
The paper is devoted to the study of a singular nonlinear second-order parabolic equation, which is called the porous medium equation or the nonlinear heat equation. One of the important classes of its solutions is heat waves propagating over a zero background with a finite velocity. This property is not typical for parabolic equations and is a consequence of singularity. The main object of study is exact solutions of mentioned type. A new way of separating variables is used to represent them. We obtain conditions when it is possible to make a reduction to the Cauchy problem for an ordinary second-order differential equation with a singularity. It is shown that the Cauchy problem describes a heat wave whose front moves exponentially. We construct a solution to the Cauchy problem as a power series and determine the cases when the series breaks off, i.e. the solution has the form of a polynomial, and the corresponding heat wave can be written explicitly. If the Cauchy problem cannot be explicitly integrated, the solution is constructed numerically. An algorithm based on the boundary element method is proposed. We perform a computational experiment and conclude the properties of the found solutions. Besides, the accuracy of the calculation results is analyzed.
The paper addresses a nonlinear heat equation (the porous medium equation) in the case of a power-law dependence of the heat conductivity coefficient on temperature. The equation is used for describing high-temperatur...
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