Physics

Methods for Enhancing Emissive Ability of the Carbon Nanotubes

Authors: Glukhova O. Е., Kirillova I. V., Savin A. N., Grebenyuk K. A., Slepchenkov M. М., Kolesnikova A. S., Fadeev A. A., Smigin D. S.

The analysis of papers devoted to study of the emission properties of the carbon nanotubes and to revealing ways for the control of these properties has been performed. Five main methods for enhancing emissive ability of the carbon nanotubes have been singled out.

Analysis by Finite Element Method of Integral Antenna of RFID Tag at 5.5–6.5 GНz

Authors: Suchkov S. G., Nikolayevets V. A., Suchkov D. S., Ermishin V. V., Rossoshanskiy A. V.

Numerical analysis effective integral antenna of acoustoelectronic RFID tag was accomplished. Optimal parameters of the antenna compatible with interdigital transducer on a range of 5.5–6.5 GHz were obtained.

Surface Acoustic Wave Propagation in Two-dimensional Phononic Crystal on Piezoelectric Substrate

Authors: Yankin S. S., Talby A., Perbedaan J., Preobrazhensky V. L., Pernod P., Bu Matar O.

Using finite element method analysis of surface acoustic wave (SAW) propagation in the phononic crystal in a form of periodic lattice from nickel pillars, located on a piezoelectric substrate of Y + 128°-cut LiNbO3, has been conducted. Amplitude and phase characteristics of SAW propagation through said structure have been numerically studied and the change in the formed stopbands width and center frequency, related with geometric parameters of the phononic crystal changing, was analyzed. The numerical results were compared with the experimental measurements.

About the Definition of a Nonlinear Inductance in Static and Dynamic Regimes

Authors: Davidovich M. V., Timofeev A. I., Kornev I. A., Yavchunovsky V. Y.

The integral relations and integral-differential equations that take into account the influence of the magnetic shields (magnetic) inductance have been obtained. The non-linear magnetic materials with hysteresis and without it, and approximation of nonlinear materials and inductors have been considered. It is shown that for hysteresis we should use the nonlinear equation for the magnetization. The establishment of oscillations in a chain with the simplest approximation of a nonlinear inductance are reviewed.

Calculation of Field Amplitude Distribution of Ultrasonic Wave Beam in Moving Media

Authors: Kositcyn N. V., Petrov V. V., Petrov A. V.

The results of acoustical (ultrasonical) wave beam amplitude distribution modeling in free space and in application of moving media are presented. The propagation of ultrasonical wave has been considered in x-y coordinate plane for infinitive plate radiator restricted on x – axis. The shift of ultrasonical beam field for different distributions of moving media velocity projections in the plane of wave propagation is considered.

Application of Thin Film Structures Based on Amorphous Silicon for pH Measurements in Solutions

Authors: Mitin D. M., Volkova N. V., German S. V., Markin A. V., Venig S. B., Serdobintsev A. A.

Formation possibility of pH-sensor based on amorphous silicon thin films is shown. The principle of sensor operation is similar to the ionselective field effect transistor. Change of the investigated solution pH leads to change of depletion width and conductivity of amorphous silicon thin film structure.

Recovery of Models of Time-delay Systems from Short Experimental Time Series

Authors: Karavaev A. S., Ishbulatov Y. M., Borovkova E. I., Kulminskiy D. D., Khorev V. S., Kiselev A. R., Ponomarenko V. I., Prohorov M. D.

Time-delay systems reconstructed from short and noisy time series is conducted by the specialized method based on utilizing of driven system with the structure similar to the structure of the studied object. To show the efficiency of this approach, parameters were reconstructed for radiophysical chaotic generator and for the model of biological system.

The Influence of Monogaloidosubstitution on the Structure and Dynamics of Sixmember Cyclic Compounds

Authors: El’kin P. M., El’kin M. D., Pulin V. F., Babkov L. M.

The structure and vibrational states of monosubstituted cyclic compounds (monogaloidosubstituted of benzene, benzoquinone, gammapyrone and tiopiron) by density functional DFT / b3LYP 6-311G ** and 6-311+** are simulated. Vibrational states are interpreted.

Low-density Approximation in the Theory of Creation the Electron-positron Plasma from Vacuum in Strong Laser Fields

Authors: Dmitriev V. V., Makhankov A. V., Panferov A. D., Smolyansky S. A., Yahibbaev R. M.

Kinetic description of the vacuum creation of the electron-positron plasma under action of the strong electromagnetic fields is considered in two simplest approximations. The results are compared with the numerical solution of the relevant kinetic equation. It allows to select the regions of effectiveness of the introduced methods and to analyse some features of the obtained analytical solutions.

Temperature Effects in Vibronic Intensity of Absorption and Resonance Fluorescence Spectra

Authors: Berezina M. K., Chernavina M. L., Novoselova A. V., Berezin V. I.

Algorithms and program for calculation of the vibronic absorption and fluorescence molecular spectra are described taking into account the dependence of intensities on temperature. The algorithms are based on the construction of molecule’s quantum models in ground and excited electronic states with application of ab initio and density functional methods. The theoretic study of excited electronic states for polyatomic molecules, prediction of electronic absorption and fluorescence spectra of polyatomic molecules, the temperature dependence of intensities are described.

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