Physics

Study of Stochastic Andronov – Hopf Bifurcation in the Oscillator by a Numerical Method

Authors: Kuptsova A. A., Semenov V. V., Listov A. S.

We investigate soft Andronov – Hopf bifurcation in the Van der Pol self – sustained oscillator, which is under the influence of additive Gaussian white noise. To determine the bifurcation used numerical solution of the Fokker – Planck – Kolmogorov equation. The results are compared with the data of numerical integration of stochastic equations. Demonstrated the existence of a bifurcation interval calculated theoretically in [6].

Kinetics of Diffusion-limited Elongation of DNA Fragments

Authors: Grigoriev A. V., Manturov A. O.

The numerical model of the elongation kinetics of the single-stranded DNA has been proposed and studied. The proposed model is based on the principles of the phenomenological modelling and implemented as diffusion cellular automata. The analytical and numerical estimates of the elongation reaction rate for different concentrations of nucleotides has been obtained. The possibility of nucleotide binding delays with reducing the concentration of one of the nucleotides in the solution is shown. 

Comparative Experimental Investigations of Backward Diffuse Light Scattering of Test Objects

Authors: Revzina E. M., Maximova I. L., Skaptsov A. A.

The results of measurements of the spectral characteristics of the light scattering on test objects with different types of spectroscopic instruments were compared, backward diffuse scattering spectra, which were obtained with an integrating sphere and with the help of the illuminating and receiving optical fibers located at a short distance, were considered, the features of the spectral characteristics, which were determined by the parameters of the object, and the differences, which were caused by a method of recording of the spectrum, were identified in the scientific work.

The Effect of Illumination on Conformation of Polyelectrolyte Molecules During Adsorption onto Semiconductor Substrate

Authors: Malyar I. V., Stetsyura S. V.

The analytical model describing the influence of illumination of semiconductor substrate during polyelectrolyte adsorption onto it, which results in different deposited organic layer thickness, was suggested. The both changes of non-equilibrium charge carriers concentrations and surface charge density under illumination of semiconductor were considered, which allows one to explain changing of adsorbed layer thickness due to molecule conformation changes because of their electrostatic interaction with photosensitive substrate.

Methodological Aspects and Structure Modelling and Predicting the Behaviour of Nanocomposite Materials in QuantumWise

Authors: Belenko D. I., Therin D. V., Kondrateva O. Y., Revzina E. M., Venig S. B.

Methodological aspects and structure modelling and predicting the behaviour of nanocomposite materials in QuantumWise are discussed.

Influence of Water and Biology Active Media on Silicon Nanostructures

Authors: Belenko D. I., Bilobrova O. Y., Galushka V. V., Karsakova Y. D., Melnikova T. E., Mysenko I. B., Polyanskaya V. P., Therin D. V.

The obtained results of comparative study of solubility, optical properties and morphology of silicon nanoparticles and nano porous Si before, during and after interaction with distilled water and the biology active medium- yeast (Saccharomycetes cereviseae) show the significant dependence of the interaction between water and BAM on structure of the researched materials.

Dispersion Characteristic Calculation of Photonic Crystal Fiber Guided Modes

Authors: Plastun A. S., Konyukhov A. I.

Dispersion characteristic of photonic crystal fiber guided mode is calculated. Numerical modeling based on the Maxwell equation for magnetic components for field of the photonic crystal is obtained. It is shown, that slot photonics crystal waveguides can be used to tailor dispersion.

Using of Method Spectrometric Analysis for Detection Microorganisms

Authors: Utkin D. V., Germanchuk V. G., Yerokhin P. S., Spitsyn A. N., Shcherbakova S. A., Glazkov A. N.

This article presents data on the development of a new tool and method for detection of dangerous infectious diseases agents, which is based on spectrometric analysis. A device for detection of mentioned agents and software for analysis of results have been developed. This device allows to carry out non-specific and specific detection of pathogens with 30 minutes.

Instanton for the Maxwell–Einstein Equations

Authors: Zayko Y. N.

In this article instanton solution for the Maxwell–Einstein equations is investigated. Equations for the field of instanton and metrics are derived. Metrics of pseudoeuclidean space which is corresponding to transition between degenerate classical vacua of problem and is connected with presence at the space infinity divergent and convergent spherical electromagnetic waves is studied. An expression of the instanton is received and it’s size is found. Value of pseudoeuclidean action is calculated.

Structural-dinamics Models and Spectral Identification of Monohydroxysubstituted Flavone

Authors: El’kin P. M., Shagautdinova I. T., Pulin V. F.

On based of the calculations for parameters of adiabatic potential by method DFT/b3LYP are proposed the structural-dinamics models for monohydroxyflavones. The indications of spectral identification are revealed.

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