Моделирование распределения доз радиации электронов на поверхности спутника Юпитера Европы для различных моделей магнитного поля
It is believed that microscopic life may exist in the subglacial ocean of Europa, a moon of Jupiter. However, the radiation belts of Jupiter complicate the possibility of its exposure on the surface or at shallow depths. Using numerical simulations, we investigated the influence of the tilt of the Jupiter magnetic dipole, the Alwen wings, and the induced Europa field on the electron dynamics near the Jupiter satellite, which allowed us to refine the map of radiation doses on the Europa surface obtained earlier in the leading center approximation.
 Two very bright ultraviolet (UV) radiation sources (equatorial spots) which are located on the limb of Io near its equator have been detected in a series of observations with the Hubble space telescope. In this paper, we propose the mechanism that provides the sufficient energy of the equatorial spots to explain their high brightness in the UV wavelength range. According to the proposed model, this UV radiation is generated due to electrons which are formed as a result of additional ionization of the atmosphere in the front part of the satellite. These secondary electrons in crossed electric and magnetic fields are shifted downstream into Io’s flanks. The optical depth of the source increases on the flanks of Io’s atmosphere (from the vantage point of the observer), and we therefore observe the brightest UV radiation in this region, the value of which is in good agreement with the measured values. Also, a reasonable explanation is given for the main observed properties of the UV equatorial spots, such as (1) a correlation between the brightness of the emission and the magnetic longitude of Io and as a result, Io’s distance from the plasma torus centrifugal equator; (2) a correlation between the equatorial spot location and the planetary magnetic field orientation; and (3) the excess of the brightness of anti-Jovian UV source over the brightness of sub-Jovian source.
Features of formation and migration of radiation-induced defects in carbon nanotubes (CNT) and nanostructured materials are examined. The main methods and software tools used for the simulating nanomaterial structure and space factors are described. The results of mathematical simulation are presented.
The influence of different forms of housing cryobot speed and efficiency of movement them into the ice structures. The problems of cryobot to study the ice surface in Europe
A model for organizing cargo transportation between two node stations connected by a railway line which contains a certain number of intermediate stations is considered. The movement of cargo is in one direction. Such a situation may occur, for example, if one of the node stations is located in a region which produce raw material for manufacturing industry located in another region, and there is another node station. The organization of freight traﬃc is performed by means of a number of technologies. These technologies determine the rules for taking on cargo at the initial node station, the rules of interaction between neighboring stations, as well as the rule of distribution of cargo to the ﬁnal node stations. The process of cargo transportation is followed by the set rule of control. For such a model, one must determine possible modes of cargo transportation and describe their properties. This model is described by a ﬁnite-dimensional system of diﬀerential equations with nonlocal linear restrictions. The class of the solution satisfying nonlocal linear restrictions is extremely narrow. It results in the need for the “correct” extension of solutions of a system of diﬀerential equations to a class of quasi-solutions having the distinctive feature of gaps in a countable number of points. It was possible numerically using the Runge–Kutta method of the fourth order to build these quasi-solutions and determine their rate of growth. Let us note that in the technical plan the main complexity consisted in obtaining quasi-solutions satisfying the nonlocal linear restrictions. Furthermore, we investigated the dependence of quasi-solutions and, in particular, sizes of gaps (jumps) of solutions on a number of parameters of the model characterizing a rule of control, technologies for transportation of cargo and intensity of giving of cargo on a node station.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.