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Regular version of the site
Of all publications in the section: 199
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Article
Ibragimov R. F., Tyurin E. M., Kadilin V. V. et al. Journal of Physics: Conference Series. 2016. Vol. 675. P. 042013-042013.

In this work we study influence of various factors on stability of ionizing radiation detectors installed in the cosmic ray spectrometer (SCR) based on diamond detectors of ionization radiation (DDIR). Diamond detectors for SCR are made of single crystals of synthetic diamond type IIa. Diamond detectors were studied successively in three different experiments. Checking detector stability with ambient temperature increased up to 70 degrees Celsius was the first experiment. At next we change the geometry of detector irradiation by rotating nuclear source around it and measuring changes in detector count rate. And last one experiment was about checking the phenomenon of polarization by prolonged detector irradiation by ionizing radiation of various types and energies. The study revealed the presence of the strong influence of the polarization effect on the work of diamond detectors for registration of ionizing particles with short mean free path (in our experiment they were the alfa-particles of 238Pu). In this work correspondence of the experimental results of the "rotation" the source around the detector with the data obtained by simulation in GEANT-4 was shown.

Added: Oct 18, 2016
Article
Крылов В. В., Крылов С. В. Journal of Physics: Conference Series. 2018. Т. 1117. № conference 1.

Reservoir Computing (RC) is taking attention of neural networks structures developers because of machine learning algorithms are simple at the high level of generalization of the models. The approaches are numerous. RC can be applied to different architectures including recurrent neural networks with irregular connections that are called Echo  State Networks (ESN). However, the existence of successful examples of chaotic sequences predictions does not provide successful method of multiple attribute objects classification.

In this paper the binary ESN classifiers are researched. We show that the reason of low precision of classification is the existence of unbalanced classes. Then the method to solve the problem is proposed. It is possible to use randomizing algorithm of learning data set balancing and method of data temporalization. The resulting errors matrixes have pretty good numbers. The proposed method is illustrated by the usage on synthetic data set. The features of ESN classifier are demonstrated in the case of rare events detection such as transaction attributes fraud detection.

Added: Nov 15, 2018
Article
V P Semyonov, A V Timofeev. Journal of Physics: Conference Series. 2016. Vol. 681. No. 012025. P. 1-6.

One of the mechanisms of energy transfer between degrees of freedom of dusty plasma system is based on parametric resonance. Initial stage of this process can de described by equation similar to Mathieu equation. Such equation is studied by analytical and numerical approach. The numerical solution of the extended Mathieu equation is obtained for a wide range of parameter values. Boundaries of resonance regions, growth rates of amplitudes and times of onset are obtained. The energy transfer between the degrees of freedom of dusty plasma system can occur over a wide range of frequencies.

Added: Apr 18, 2016
Article
Kondratyuk N., Norman G., Stegailov V. Journal of Physics: Conference Series. 2016. Vol. 774. No. 012039. P. 1-9.

Molecular dynamics is applied to calculate diffusion coefficients of n-triacontane C30H62 using Einstein-Smoluchowski and Green-Kubo relations. The displacement 〈Δr2〉(t) has a subdiffusive part 〈Δr2〉 ~ t α, caused by molecular crowding at low temperatures. Longtime asymptotes of 〈v(0)v(t)〉 are collated with the hydrodynamic tail t-3/2 demonstrated for atomic liquids. The influence of these asymptotes on the compliance of Einstein-Smoluchowski and Green-Kubo methods is analyzed. The effects of the force field parameters on the diffusion process are treated. The results are compared with experimental data.

Added: Apr 7, 2017
Article
Ofengeim D., Гусаков М. Е., Haensel P. et al. Journal of Physics: Conference Series. 2019. Vol. 1400. No. 2. P. 022029.

R-mode oscillations of neutron stars are known to be generally unstable with respect to the emission of gravitational waves. This instability can be suppressed by dissipative processes in the neutron star core. The standard minimal nucleonic model of the core cannot stabilize r-modes for many observed neutron stars, at the same time the probability to observe them unstable should be very low. One of the solutions to this problem is to account for possible presence of hyperons in the stellar core. Hyperons strongly enhance bulk viscosity in the core, which effectively suppresses the r-mode instability. We revisit the bulk viscosity calculations in the non-superfluid hyperon matter and briefly discuss the effect of baryon superfluidity. Our results suggest that the hyperon solution to the r-mode problem is more promising than it was thought before.

Added: Nov 11, 2020
Article
Schegoleva M. A., Romanov A. Yu., Lezhnev E. V. et al. Journal of Physics: Conference Series. 2019. Vol. 1163. No. 1. P. 1-7.

The development of multi-core processor systems is a demanded branch of science and technology. The appearance of processors with dozens and hundreds of cores poses to the developers the question of choosing the optimal topology capable to provide efficient routing in a network with a large number of nodes. In this paper, we consider the possibility of using multiplicative circulants as a topology for networks-on-chip. A specialized routing algorithm for networks with multiplicative circulant topology, taking into account topology features and having a high scalability, has been developed.

Added: May 9, 2019
Article
Timofeev Alexey Vladimirovich, Николаев В. С. Journal of Physics: Conference Series. 2016. Vol. 774. No. 012172. P. 1-6.

Particles interaction and value of the screening length in dusty plasma systems are of great interest in dusty plasma area. Three inter-particle potentials (Debye potential, Gurevich potential and interaction potential in the weakly collisional regime) are used to solve equilibrium equations for two dusty particles suspended in a parabolic trap. The inter-particle distance dependence on screening length, trap parameter and particle charge is obtained. The functional form of inter-particle distance dependence on ion temperature is investigated and compared with experimental data at 200–300 K in order to test used potentials applicability to dusty plasma systems at room temperatures. The preference is given to the Yukawa-type potential including effective values of particle charge and screening length. The estimated effective value of the screening length is 5–15 times larger than the Debye length.

Added: Feb 17, 2017
Article
Altukhov A. A., Zakharchenko K. V., Kolyubin V. et al. Journal of Physics: Conference Series. 2016. Vol. 675. No. 4. P. 042027.

The article describes the device for selective registration of electrons, protons and heavy ions fluxes from the solar and galactic cosmic rays in the twelve energy ranges, built on a base of diamond detector. The use of the diamond detectors allowed for the creation a device for registration of cosmic particles fluxes at the external spacecraft surface with the resource not less than 20 years. Selective detector is aimed for continuous monitoring of radiation situation on board the spacecrafts, in order to predict the residual life of their work and prompt measures to actively protect the spacecraft when the flow of cosmic particles is sharply increased.

Added: Jun 22, 2016
Article
Kondratyuk N., Orekhov M. Journal of Physics: Conference Series. 2020. Vol. 1556. P. 012048.

The molecular dynamics methods for calculation of shear viscosity based on liquid diffusivity are tested against the classical Green–Kubo relation for n-pentane at 330 K and 0.601 g/cm3. The D-based method is shown to be as accurate as calculation of viscosity from the Green–Kubo formalism for pentane liquid. Stokes–Einstein relation is also in agreement with simulation results. However, it has much bigger uncertainty. The results of the simulation are in agreement with experimental data.

Added: Oct 25, 2020
Article
Golikov A., Kovalyuk V., An P. et al. Journal of Physics: Conference Series. 2018. Vol. 1124. No. 5. P. 1-4.

Here we present an integrated nanophotonic circuit for on-chip spontaneous four-wave mixing. The fabricated device includes an O-ring resonator, a Bragg noch-filter as well as a nine-channel arrayed waveguide gratings (AWG) operated in the C-band wavelength range (1550 nm). The measured optical losses of the device (-6.8 dB) as well as a high Q-factor (> 1.2× 10 5) shows a good potential for realizing the spontaneous four-wave mixing on the silicon nitride chip.

Added: Oct 31, 2019
Article
Bondarenko G., Fisher M. R., Kristya V. I. Journal of Physics: Conference Series. 2012. Vol. 406. No. 012031. P. 1-6.

Simulation of electron, ion and metastable excited atom motion and interactions in a low-current discharge between the flat electrodes of a gas- discharge device in argon-mercury mixture is fulfilled. Also influence of gas temperature on both densities and fluxes of particles has been investigated. Distributions of the particle densities along the discharge gap under different mixture temperatures are obtained. It has been demonstrated that the principal mechanism of mercury ion generation was the Penning ionization of mercury atoms by argon metastables, which contribution grows sharply with the mixture temperature due to mercury density increase. Calculations showed that both mercury and argon ion flow densities near the cathode where of the same order already under the relative mercury content of about 10-4 corresponding at the argon pressure 103 Pa to the mixture temperature 30 C. Because the mean path length of a mercury ion in the mixture between the resonant charge exchanges on parent gas atoms is much more than that of an argon ion, the energies of mercury ions exceed considerably the energies of argon ions, and they make the main contribution to the physical electrode sputtering. which reduces the service time of the gas- discharge device.

Added: Jan 17, 2013
Article
Ivanova E., Vishnekov A. Journal of Physics: Conference Series. 2019. Vol. 1163. No. 012010. P. 1-6.

Abstract. The article considers the features of super-scalar processors, their way of performing several operations on several pairs of operands simultaneously. The research focuses on the organization of processor pipeline execution operation of several machine instructions in one processor core. The simulating kit was developed for better understanding of a processor core microarchitecture. It includes two parts: program and methodical recommendations with multiple task options. The simulating kit demonstrates the pipeline architecture consisting of two clusters: front-end and back-end and the principle of translating complex multi-cycle CISC-like instructions into simpler RISC-like micro-operations. The main types of machine instructions are considered: data transfer between registers and memory cells (four variations), data processing of couple of operands from registers and memory cells (four variations), conditional jump to the specified address. The program-simulator makes it possible to conduct a more detailed simulation of one of the three mechanisms for calculations accelerating in the processor core: multi-functional (super-scalar) processing, out-of-order processing, speculative instructions execution after the branch prediction. The simulating kit is used in educational process when training masters of Higher School of Economics National Research University.

Added: Oct 31, 2018
Article
A N Varnavsky, A V Rogulina. Journal of Physics: Conference Series. 2020. Vol. 1441. No. 1. P. 012174.

Currently advanced driver-assistance systems develop actively, which allow to signal to the driver about danger of collision of vehicles, necessary braking or changes of motion parameters of the car to prevent dangerous situations and accidents. The effectiveness of advanced driver-assistance systems from the parameters of their work. Therefore, the actual task is to set the optimal parameters of advanced driver-assistance systems. The values of such parameters in general can be both statistical and independent of the current road situation, and dynamic and depend on the current road situation. This problem cannot be solved without modeling dangerous situations, creating models of motion and collision risks, the results of which can be given recommendations for setting the parameters of the advanced driver-assistance systems. The aim of the work is statistical modeling collision vehicles on the unregulated crossroads and the evaluation dependency of probability collision from the parameters of the road situation. An analytical modeling of the movement of vehicles at the crossroads was used and a mathematical model of their collisions was built. With the help of statistical modeling a probability of their collision with different parameters road situation was rated. Received result can be used to configuration parameters management vehicle advanced driver-assistance systems, including dynamic.

Added: Oct 18, 2020
Article
Vnukov A., Blinov A. E. Journal of Physics: Conference Series. 2018. Vol. 955. No. 012036. P. 012036-1-012036-6.

Object of this research are macroeconomic indicators, which are important to

descript economic situation in a country. Purpose of this work is to identify these indicators

and to analyze how the state can affect these figures with available instruments. Here was

constructed a model where the targets can be calculated from raw data – tools in the field of

economic policy. Software code that implements all relations among the indicators and allows

to analyze with high accuracy, sufficiently successful economic policies and with the help of

some tools, you can achieve better results. This model can be used to forecast macroeconomic

scenarios. The corresponding values of the objective (outcome) variables are set as a

consequence of the configuration data of the previous period, subject to external influences and

depend on the instrumental variables. The results may be useful in economical predictions. The

results were successfully checked on real scenarios of Russian, European and Chinese

economics. Moreover, the results can be applied in the field of education. Program is available

to use as “economical game” the educational process of the University, in which you can

virtually implement various macroeconomic scenarios, draw conclusions about their success.

Added: Mar 14, 2018
Article
Manita L., Ronzhnina M. Journal of Physics: Conference Series. 2019. Vol. 1163. P. 1-6.

We study an optimal control problem for a nonlinear spherical inverted pendulum on a movable base. As the cost functional, the mean-squared deviation of the pendulum from the upper equilibrium is considered, so optimal controls stabilize the pendulum at the unstable upper position. We show that the problem under consideration posses a singular point of the second order and there are spiral-similar solution which attains the singular point in finite time.

Added: Jun 15, 2019
Article
Manita L., Ronzhina M. Journal of Physics: Conference Series. 2018. Vol. 955. No. 1. P. 1-6.

Optimal control problem for the system of partial differential equations of hyperbolic type is  considered. By using the Fourier method this problem is reduced to the optimal control  problem for the corresponding Fourier coefficients. For some special initial data we prove  the existence of optimal solutions with a countable number of switchings on a finite time  interval and optimal spiral-like solutions which attain the origin in a finite time making a  countable number of rotations. The problem of controlling the vibrations of the Timoshenko  beam is considered as an example of the optimal control problem for linear system of PDE.

Added: Jun 17, 2018
Article
Gromov E. Journal of Physics: Conference Series. 2015. Vol. 574. P. 012032.

Dynamics of solitons is considered in an extended nonlinear Schrödinger equation, including a pseudo-stimulated-Raman-scattering (pseudo-SRS) term (scattering on damping low-frequency waves, nonlinear dispersion and inhomogeneity of the spatial second-order dispersion (SOD). It is shown that wave-number downshift by the pseudo-SRS may be compensated by upshift provided by spatially increasing SOD with taking into account nonlinear dispersion. The equilibrium state is stable for negative parameter of nonlinear dispersion and unstable for positive one. The analytical solutions are verified by comparison with numerical results

Added: Sep 11, 2014
Article
Solodikhina A., Solodikhina M. Journal of Physics: Conference Series. 2020.

The cult of innovation has led to a demand for innovators who have both the mindset of an inventor who can see a problem and find a way to solve it, and the mindset of an entrepreneur who is ready to bring that solution to life. Thus, teaching a techno-innovator involves combining STEM and business education with a common goal to develop the innovator's thinking as a symbiosis of design- and business- thinking. The tool for the formation of design thinking can be the link of "STEM cases + project", and the tool for the development of business thinking "entrepreneurial cases + startup", a startup as the inculcation and diffusion of the project product. Cases contain problem situations during the development of a startup and a chain of tasks that help to see different ways to solve a problem. The assignments are formulated in such way to serve as a trainer for the development of components of design- and business- thinking. The study involved 222 HSE students. The trainees in the system of case + start-up showed progress in the development of design and business thinking components and a change in the type of motivation from internal to external.

Added: Nov 11, 2020
Article
Baksheeva K., Vdovydchenko A., Gorshkov K. et al. Journal of Physics: Conference Series. 2019. Vol. 1410. No. 1. P. 012076.

The radiation of human skin in the terahertz frequency range under the influence of mental stresses has been studied in the current work. An experimental setup for observation of changes in human skin radiation, which occur under the influence of psychological stresses, by means of a superconducting integrated receiver has been developed. More than 30 volunteers participate in these studies, which allows us to verify presence of correlation between the signals from the superconducting integrated terahertz receiver and other sensors that monitor human mental stress.

Added: Dec 24, 2019
Article
Fleita D. Y., Norman Genri E., Pisarev Vasily V. Journal of Physics: Conference Series. 2018. Vol. 946. No. 1. P. 012102-1-012102-7.

This paper discusses the results of the application method of spatial correlation functions on a glass-forming liquid of a pure metal melt by performing molecular dynamics simulations. We define a high-order correlation function that quantifies a spatial correlation of single-particle displacements in liquids and amorphous systems. Time dependencies of the different 4-point spatial functions for supercooled and normal melt are obtained.

Added: Oct 31, 2018
Article
Fleita D., Norman G., Pisarev V. Journal of Physics: Conference Series. 2018. Vol. 946. P. 012102.

This paper discusses the results of the application method of spatial correlation functions on a glass-forming liquid of a pure metal melt by performing molecular dynamics simulations. We define a high-order correlation function that quantifies a spatial correlation of single-particle displacements in liquids and amorphous systems. Time dependencies of the different 4-point spatial functions for supercooled and normal melt are obtained.

Added: Feb 18, 2020