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Regular version of the site
Of all publications in the section: 186
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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
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
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
Article
Kirova E. M., Pisarev V. Journal of Physics: Conference Series. 2016. Vol. 774. P. 1-6.

Molecular dynamics study of shear viscosity behavior of liquid aluminum is performed. The embedded atom method potential is used at the simulation of isobaric cooling. The viscosity is calculated using the Green–Kubo formula. The stress autocorrelation functions are obtained in the range 300–1200 K. The calculated kinematic viscosity is in agreement with the experimental data for the temperatures above melting temperature. The steep change of the shear viscosity is found below 650 K which we associate with the glass transition and is in a good agreement with the temperature which is obtained using the calorimetric criterion Kolotova et al (2015 J. Non-Cryst. Solids 429 98). The viscosity coefficient can not be calculated using the direct atomistic simulations below that temperature

Added: Apr 4, 2017
Article
Seleznev V., Divochiy A., Vakhtomin Y. et al. Journal of Physics: Conference Series. 2016. Vol. 737. No. 012032. P. 1-9.

We have developed the deposition technology of WSi thin films 4 to 9 nm thick with high temperature values of superconducting transition (Tc~4 K). Based on deposed films there were produced nanostructures with indicative planar sizes ~100 nm, and the research revealed that even on nanoscale the films possess of high critical temperature values of the superconducting transition (Tc~3.3-3.7 К) which certifies high quality and homogeneity of the films created. The first experiments on creating superconducting single-photon detectors showed that the detectors‟ SDE (system detection efficiency) with increasing bias current (Ib) reaches a constant value of ~30% (for =1.55 micron) defined by infrared radiation absorption by the superconducting structure. To enhance radiation absorption by the superconductor there were created detectors with cavity structures which demonstrated a practically constant value of quantum efficiency >65% for bias currents Ib0.6Ic. The minimal dark counts level (DC) made 1 s-1 limited with background noise. Hence WSi is the most promising material for creating single-photon detectors with record SDE/DC ratio and noise equivalent power (NEP).

Added: Nov 24, 2017
Article
Seleznev V., Divochiy A., Vakhtomin Y. et al. Journal of Physics: Conference Series. 2016. Vol. 737. No. 1. P. 012032.

We have developed the deposition technology of WSi thin films 4 to 9 nm thick with high temperature values of superconducting transition (Tc∼4 K). Based on deposed films there were produced nanostructures with indicative planar sizes ∼100 nm, and the research revealed that even on nanoscale the films possess of high critical temperature values of the superconducting transition (Tc∼3.3-3.7 K) which certifies high quality and homogeneity of the films created. The first experiments on creating superconducting single-photon detectors showed that the detectors' SDE (system detection efficiency) with increasing bias current (I b) reaches a constant value of ∼30% (for X=1.55 micron) defined by infrared radiation absorption by the superconducting structure. To enhance radiation absorption by the superconductor there were created detectors with cavity structures which demonstrated a practically constant value of quantum efficiency >65% for bias currents Ib>0.6-Ic. The minimal dark counts level (DC) made 1 s-1 limited with background noise. Hence WSi is the most promising material for creating single-photon detectors with record SDE/DC ratio and noise equivalent power (NEP).

Added: Nov 22, 2016
Article
Золотов Ф. И., Goltsman G., smirnov e. et al. Journal of Physics: Conference Series. 2018. No. 1124. P. 1-4.

We demonstrate superconducting niobium nitride nanowires folded on top of lithium niobate substrate. We report of 6% system detection efficiency at 20 s-1 dark count rate at telecommunication wavelength (1550 nm). Our results shown great potential for the use of NbN nanowires in the field of linear and nonlinear integrated quantum photonics.

Added: Dec 27, 2018
Article
Podinovski V.V., Nelyubiin A., Potapov M. A. Journal of Physics: Conference Series. 2019. Vol. 1203. No. 1. P. 1-6.

The new version of the software system DASS designed to solve multicriteria problems using methods of the criteria importance theory is described. A new approach has been developed by the authors, allowing to take into account inaccurate and fuzzy information about preferences of decision makers.

Added: Jul 19, 2019
Article
Lankin A., Norman G., Orekhov M. Journal of Physics: Conference Series. 2015. Vol. 653. P. 012155.

A research of the diffusion of an ion in a liquid is carried out. Dependences of the diffusion coefficient on the ion-molecule potential, ion mass, liquid temperature and density are defined. The results are related to the ion solvation. The classical molecular dynamics method is applied. The effect of the ion solvation is discovered. Firstly, ion mass has no influence on the diffusion coefficient. This is because the total mass of the cluster formed by the ion and the ion solvation shell varies slightly while the mass of the ion changes significantly. In addition, the dependence on short-range interaction is found to be rather weak. The dependence of the diffusion coefficient on long-range interaction is found to be really stronger than on short- range. The ion velocity autocorrelation function calculated reveals a strong oscillatory character superimposed on the conventional functional liquid-type form. It reflects the oscillations of the ion inside the solvation shell. The relation between the ion mobility and temperature is found to be of the Arrhenius-type form.

Added: Apr 5, 2017
Article
Omelchenko A., Korenev V., Zhukov A. et al. Journal of Physics: Conference Series. 2014. Vol. 541. P. 012056.

Using the analytical approach introduced in our previous papers we analyse the possibilities of optimization of size and structure of active region of semiconductor quantum dot lasers emitting via ground-state optical transitions. It is shown that there are optimal length' dispersion and number of QD layers in laser active region which allow one to obtain lasing spectrum of a given width at minimum injection current. Laser efficiency corresponding to the injection current optimized by the cavity length is practically equal to its maximum value.

Added: Sep 17, 2018
Article
Novikova T. D., Belov A. V. Journal of Physics: Conference Series. 2019. Vol. 1163. No. 012071. P. 1-7.

For the modern software that uses network communication protocols the problem of the ensuring reliability is acute. To solve such an important problem the stress testing is used. This type of the testing involves the generation of a large number of the test data, including sets of network packets. Reducing the stored data after the testing process is the main task. This task can be solved by clustering the set of received packets. To solve this problem it is proposed to use the clustering algorithm for categorical data of CLOPE. This algorithm allows to cluster datasets without the information about the source clusters. It has the low computational complexity and ease of implementation. The article describes the preparation and results of sets of the network packets processing experiments. The article shows that the CLOPE algorithm can be effectively used for the clustering network packets received during stress testing. The results of the research extend the toolkit for the SW stress testing process.

Added: Aug 3, 2019
Article
A N Varnavsky. Journal of Physics: Conference Series. 2017. Vol. 803. No. 1. P. 1-7.

The paper presents the automated system intended to prevent industrial-caused diseases of workers, the basis of which is represented by algorithms of preventing several negative functional conditions (stress, monotony). The emergence of such state shall be determined based on an analysis of bioelectric signals, in particular, skin-galvanic reactions. Proceeding from the dynamics of the functional state, the automated system offers to perform an optimized set of measures to restore the health of the worker. Implementation of an automated system is presented in Visual Programming system LabVIEW.

Added: Sep 11, 2018
Article
Kirova E. M., Pisarev V. Journal of Physics: Conference Series. 2018. Vol. 946. P. 012115-1-012115-7.

Molecular dynamics study of stress correlations and shear viscosity behavior of the rapidly cooled and re-heated liquid aluminum film is performed. The embedded atom method potential is used at the simulations. The stress correlation behavior is studied in the plane of the film and along the direction normal to the plane. The behavior of the kinematic viscosity and the stress correlationsare compared for cooling and heating process. Using two methods it is shown that the glass transition temperature for the cooling process is higher than for the heating.

Added: Nov 16, 2017
Article
Valeev B., Pisarev V. Journal of Physics: Conference Series. 2018. Vol. 946. P. 1-6.

In this work, we study the vapor{liquid equilibrium in n-pentane. We use the TraPPE-EH (transferable potentials for phase equilibria - explicit hydrogen) forcefield, where each hydrogen and carbon atom is considered as independent center of force. The fluid behavior was investigated with different values of density and tempreture by molecular dynamics method. The n-pentane evaporation curve was calculated in the temperature range of 290 to 390 K. The densities of the coexisting phases are also calculated. The compression curve at 370 K was calculated and isothermal bulk modulus was found. The simulated properties of n-pentane are in good agreement with data from a database of the National Institute of Standards and Technology, so the TraPPE{EH model can be recommended for simulations of hydrocarbons.

Added: Dec 4, 2017
Article
Zhukova N. Journal of Physics: Conference Series. 2018. Vol. 990. No. 1. P. 1-15.

A foliation that admits a Weyl structure arising from a pseudo-Riemannian metric of any signature as its transverse structure is called a pseudo-Riemannian Weyl foliation or (for short) a Weyl foliation. We investigate codimension q ≥ 2 Weyl foliations on (not necessarily compact) manifolds. Different interpretations of their holonomy groups are given. We prove a criterion for a Weyl foliation to be pseudo-Riemannian. We find a condition on the holonomy groups which guarantees the existence of a transitive attractor of (M, F). Moreover, if the Weyl foliation is complete, this condition implies the existence of a global transitive attractor. We describe the structure of complete Weyl foliations modelled on Riemannian manifolds.

Added: Apr 1, 2018