Physics

Pair Production in a Strong Electric Field with an Account of the Coulomb Interaction

In the framework of the Dirac model of vacuum the creation of е+е− pairs in a constant and uniform electric field with allowance Coulomb interaction between е+ and е− is considered. The transmission coefficient via the energy gap deformed by external field and the electric fields of particles is calculated in the semiclassical approximation. The Sauter exponential factor is modified by the exactly calculated function G(y) accounting Coulomb interaction of particles and changes in the shape of the potential barrier.

Geometry of the Free System of Material Points with Masses Depending on the Configuration of the System

Authors: Gochman A. V.

The motion of the free system of material points with masses depending on the configuration of the system is considered. We give the interpretation of this motion as a geodesic path in the projectively flat space.

Method of TimeDelay Systems Recovery from Time Series with Known Type of Model Equation

Authors: Ponomarenko V. I., Prohorov M. D., Sidak E. V.

We propose the method for the reconstruction of firstorder timedelay systems from their time series. The method is based on taking into account the type of the system equation at the regression model construction. The method allows one to recover the delay time, the parameter characterizing the inertial properties of the system and the nonlinear function. It can be applied to the recovery of timedelay systems performing chaotic and periodic oscillations.

TGF-Mode Elimination in Hemodynamics of Vascular Nephron Tree

Authors: Postnov D. D., Sosnovtseva O. V., Postnov D. E.

By means of numerical experiment, we studied the oscillating patterns, generated by the interaction of nephrons in the vascular tree and compared them with experimental data. Based on these results we calculated the blood flow in all branches, as well as its Fourier power spectra, to characterize its spectral composition. We reveal the mechanism responsible for the effective localization of hemodynamic interaction based on elimination of modulation rhythms of blood flow at each branching level.

Morphological Changes in the Internal Organs of Laboratory Animals under a Single Administration of Fe Nanoparticles

Authors: Navolokin N. A., Matveeva O. V., Maslyakova G. N., Bucharskaya A. B., Suleymanova L. V., Kun S. M., Medvedev B. A., Ignatiev A. A., Bochkaryeva T. V.

The cytotoxic effect of iron nanoparticles of size of 70 nm was studied in an experiment with single intramuscular and oral administration in albino mice and rats. Morphological changes were assessed in the internal organs, brain and the injection site. Studies had shown that intramuscular changes are more pronounced than when nanoparticles were administered orally and were shown in signs of cell damage while after the oral administration the blood flow changes in vessels were noted.

PlasmonResonance Gold Nanoparticles as Drug Carriers and Optical Labels for Cytological Investigations

Authors: Bibikova O. A., Staroverov S. A., Sokolov O. I., Dikman L. A., Bogatyrev V. A.

In this paper we report on the investigation of the influence of plasmon resonant gold nanoparticles (PRGNPs) and their complex with anticancer drug prospidin to the physiological functions (endocytosis, respiratory activity, viability) of tumor cell lines HeLa and SPEV2. We used the combination of several microscopic regimes to register the light scattering and fluorescence for visualization the cells and PRGNPs. The citratestabilized colloidal gold with average particle diameter 50 nm was used as plasmon resonant labels.

The Changes of Morphological Indicators of Bone Marrow and Peripheral Blood at Long Exposure of Gold Nanoparticles

Authors: Firsova S. S., Bucharskaya A. B., Maslyakova G. N., Zlobina O. V., Matveeva O. V., Bugaeva I. O., Khlebtsov N. G., Khlebtsov B. N., Bogatyrev V. A.

The exposure of gold nanoparticles with different size on the morphological indicators of red bone marrow and peripheral blood of white not purebred rats at long peroral introduction were studied in experiment. The mutagen influence of gold nanoparticles on polychromatophilous erythrocytes of bone marrow were estimated by micronuclear test. During research the reduction of quantity of leukocytes in peripheral blood and the erythrocyte volume reduction with increase of their hemoglobin saturation were revealed.

The Influence of the Boundary Conditions on ohe Dynamics of the Piezogyroscope’s Sensitive Element

Authors: Olshanskiy V. Y., Serebryakov A. V., Abitova I. F.

There has been considered the fluctuations inside the sensitive element of the piezogyroscope while measuring the angular velocity. The coupled electroelasticity problem for the system of the elastic piezoceramic plates and associated mass has been solved. The presence of the viscous forces during the deformation was taken into consideration. There has been investigated the influence of the plate fixation on the amplitudefrequency characteristics of the device.

Mathematical Modelling Multilayered Waveguides Magnitodielektrical Structures with Strip and Slot Elements on Borders of Section of Environments

Authors: Aleksutova S. V.

The effective algorithm of modeling of difficult multilayered electrodynamics systems with strip and slot elements on borders of layers is presented. The approach to construction of algorithm of the automated designing of such systems by a given topology and parameters was developed.

Technique of Digital Laser Speckle-Photography for Measurement of Scattered Object Microdisplacement

Authors: Maksimova L. A., Mysina N. Y., Grebenyuk A. A., Gorbatenko B. B., Ryabukho V. P.

Specklephotography with twoexposition digital recording of specklestructure of diffraction field and numerical specklegram processing for measurements of scattering object micro displacement is considered. Methods for realization of specklephotography technique with recording of digital specklegrams in far field diffraction area and in field of focused image are discussed. Natural and numerical experiments to obtain measuring information on object micro displacement are performed.

Physics

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