Analysis of paraboloid model's parameters influence on the model magnetic field along the trajectory of the Juno spacecraft
Analysis of paraboloid model's parameters influence on the model magnetic field along the trajectory of the Juno spacecraft
I. A. Pensionerov, E. S. Belenkaya, I. I. Alexeev, V. V. Kalegaev
In the present work we studied the behavior of the magnetic field calculated in the paraboloid model of the Jovian magnetosphere, for different values of the parameters. The most significant parameters of the model were found and their effect on the model magnetic field along the second orbital trajectory of the Juno spacecraft was studied. The influence of the magnetodisc model on the position of the spacecraft trajectory projection on the ionosphere is considered.
Show AbstractInverse magnetoelectric effect in Pb(Zr,Ti)O3 (PZT) / Finemet two-layered composite structures
Inverse magnetoelectric effect in Pb(Zr,Ti)O3 (PZT) / Finemet two-layered composite structures
S. L. Efremova, E. E. Shalygina
In recent years, much attention has been paid to the study of magnetoelectric (ME) effects in solids that was caused by the possibility of their practical applications. In most of natural crystals, ME effects are small in magnitude and are observed, as a rule, at low temperatures or in large magnetic fields. To date, most of the experimental work is devoted to a direct magnetoelectric effect. However, the study of the inverse magnetoelectric effect also deserves attention. The ME effect can be increased by creating composite structures. This paper is devoted to the study of the reverse ME effect in a two-layer composite sample consisting of a piezoelectric plate Pb(Zr, Ti) O3 and an amorphous FeSiBNbCu ferromagnetic ribbon. It was found that the ME effect depends on the magnitude of the magnetization reversal field, H, the electric voltage, U, and also on their mutual orientations.
Show AbstractThe Nucleation and Growth of Crystalline Structures in a Supercooled Metallic Melt
The Nucleation and Growth of Crystalline Structures in a Supercooled Metallic Melt
D. T. Yarullin, B. N. Galimzyanov, A. V. Mokshin
In the present work, the crystalline phase nucleation and growth processes in a metallic melt are investigated at different supercooling values. We show that both at small and at extremely deep supercooling levels, the homogeneous nucleation scenario is realized at the initial stage of phase transition of the system. We found that the nucleus critical size depends slightly on the supercooling level of the system: in the considered temperature range the nucleus critical size decreases by a few tens particles at significant increasing of supercooling level. The maximal nucleation rate is achieved at moderate supercooling, which corresponds to temperature range located near the glass transition temperature of the system.
Show AbstractResponse of the muon hodoscope URAGAN to the thunderstorm events occurred in the Moscow region
Response of the muon hodoscope URAGAN to the thunderstorm events occurred in the Moscow region
A. P. Kachur$^1$, A. N. Dmitrieva$^1$, A. A. Kovylyaeva$^1$, V. V. Shutenko$^1$
The flux of muons generated in the atmosphere is sensitive to changes of its basic thermodynamic parameters along the particle trajectory. This dependence is used for the muon diagnostics of the atmosphere. It can be used to trace the dynamics of such events as thunderstorms. In this work the search of thunderstorm-caused disturbances of the muon flux registered by the muon hodoscope URAGAN was conducted by an automatic method of finding of the significant deviations of the current values of the muon counting rate ($I_\text{sum}$) and local anisotropy parameters ($r_\text{south}$, $r_\text{east}$, $r_\text{z}$) from their moving average. The dates selected by this way were compared with the thunderstorm observation dates from the data of three independent meteorological stations ``Domodedovo'', ``VDNKh'' and ``Balchug'' as well as with the data of the meteorological station located in the Experimental Complex NEVOD. The analysis of the obtained data showed that the characteristic events for a thunderstorm are single deviations in the considered parameters, which usually occur several times during a thunderstorm. Also, during a thunderstorm, periodic perturbations with periods in the range from one to five hours are found in the characteristics of the muon flux.
Show AbstractHydrodynamic behavior of proteins in concentrated solutions according to the pulsed field gradient NMR
Hydrodynamic behavior of proteins in concentrated solutions according to the pulsed field gradient NMR
A. M. Kusova$^{1,2}$, A. E. Sitnitsky$^1$, Yu. F. Zuev$^1$
The concentration dependences of self-diffusion coefficient of various proteins: fibrinogen, trypsin, α-chymotrypsin and αS-casein were studied by means of the pulse field gradient nuclear magnetic resonance. The experimental data was analyzed in a view of the Vink’s phenomenological approach based on the frictional formalism of non-equilibrium thermodynamics. The obtained results indicate that the phenomenological approach is universal and provides an adequate description of the experimental data for proteins of different structure and shape in a wide concentration range. With the help of Vink’s approach the diffusion mobility of proteins was characterized. The concentration was determined, when the αS-casein oligomerization appears.
Show AbstractThe effect of solar flares on the ionosphere of the Earth during 24th cycle of solar activity
The effect of solar flares on the ionosphere of the Earth during 24th cycle of solar activity
S. V. Syrovatskiy$^{1,2}$, Yu. V. Yasyukevich$^{1,2}$, A. M. Vesnin$^2$, I. K. Edemskiy$^2$, S. V. Voeykov$^2$, I. V. Zhivetiev$^{2,3}$
This work describes of ionospheric effects from the data of global navigation satellite systems of a number of solar flares of different power classes (X-, M-, C-class) during 2014-2017. Our results demonstrate that the algorithm of averaging the derivative of the variations of the total electron content for all stations on the illuminated side of the Earth can exactly detect of X-сlass flares and with sufficient accuracy for practice detect of M-class flares in the automatic mode (the «signal skip» error is approximately 2.76%). Also shown that in some cases the variability of the ionospheric response is a consequence of the difference in the dynamics of solar radiation in the X-ray and ultraviolet frequency ranges.
Show AbstractPhase phenomena in the 3D Ising gauge model
Phase phenomena in the 3D Ising gauge model
S. D. Mostovoy$^1$, O. V. Pavlovsky$^{1,2}$
In this paper phase phenomena in the three-dimensional Ising gauge model were studied. Using the Monte Carlo simulation method, it was shown that the model possesses a phase transition. To determine the critical temperature of the model several order parameters were considered: plaque magnetization, Wilson loops and the mass of the lattice defect (vacancy). Considering the Wilson loops of area 2 of different spatial forms, we have found the energy difference between them in the vicinity of the phase transition. It was also shown that the mass of the defect has a peak near the phase transition and that this peak's position tends to the critical point with increasing lattice volume.
Show AbstractEmpirical recovery of mathematical models of a linear measuring transducer and the optimal computing transducer
Empirical recovery of mathematical models of a linear measuring transducer and the optimal computing transducer
D. A. Balakin
It follows from the theory of measuring-computing systems that the requirements for a measuring transducer (MT) that forms measurement result during interaction with the measured object in order to obtain maximal interpretation accuracy significantly differ depending on how it is going to function — by itself or as a part of a measuring-computing transducer (MCT). In the second case, maximal interpretation accuracy has to be provided by the MCT that is considered to be a measuring device of the same purpose as the "perfect" device for the researcher. As a rule, an exact mathematical MT model and, hence, the algorithm realized by the computing transducer (CT) that provides maximal accuracy of MCT as a measuring device, are not known to the researcher, but he can perform test measurements of known objects. The aim of this article is to synthesize using test measurements both the response of a MT with unknown model and the optimal interpretation of the measurement result, i.e., the output signal of the MCT.
Show AbstractWhat can we learn about the properties of atomic nuclei from the mass table? Scientific and educational aspects
What can we learn about the properties of atomic nuclei from the mass table? Scientific and educational aspects
E. V. Vladimirova$^{1,2}$, I. D. Dashkov$^1$, B. S. Ishkhanov$^{1,2}$, T. Yu. Tretyakova$^2$
Information on the masses of atomic nuclei is becoming more accessible every year, both due to the increase in the number of open isotopes, and due to the refinement of the available data. Consequently, the phenomenological approach to the study of the properties of atomic nuclei through mass ratios is becoming more and more appropriate. Mass relations are considered and their relationship with the properties of the atomic nucleus is shown in this article. This approach can be effectively used for educational purposes due to its simplicity. A large number of mass relations, as well as a significant amount of the constantly updated base of atomic nuclei, require the automation of the calculation and visualization of mass characteristics in various nuclear chains. The MaRel program designed to solve this problem is described in this article.
Show AbstractQuick estimation of registration efficiency of radioactive decays used in EXO-200 experiment
Quick estimation of registration efficiency of radioactive decays used in EXO-200 experiment
V. A. Belov
During study of cosmogenic background sources in EXO-200 experiment we obtained a list of 1689 isotopes, produced by passing of cosmic muons. Here we describe a method that allowed to estimate which isotopes from the list don't have a significant impact on a low-background data from the detector. Using this method we excluded more than 98~\% from the list with reasonable consumption of computing resources. This method might be useful in other cases of study of processes of material activation.
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