Physics

Dependence of Fractal Dimension of Biospeckles on Conditions of Illumination: Computer Simulation

There were presented results of computer simulation of processes of scattering of laser light on biological objects with fractal structure. Dependence of fractal dimension of speckle pattern formed under illumination of model of biological object on fractal properties of object of interest and on correlation between diameter of laser beam and dimensions of biofractal was investigated.

Dynamic and Spectral Characteristics of Time Series Describing Pulse Wave Velocity

Authors: Postnov D. E., Koreshkov R. N., Semyachkina-Glushkovskaya O. V.

We analyze the dynamic and spectral characteristics of the signals that reflects the rapid changes in pulse wave velocity (PWV). We describe the characteristics of PWV signal in the high frequency HF range (from 0.1 to 0.5 Hz) and suggest a simple model that illustrates our hypotheses.

Effect of Spectral Properties of Image Sensor on Interference Experiment

Authors: Kalyanov A. L., Lychagov V. V., Smirnov I. V., Ryabukho V. P.

Influence of spectral properties of monochrome image sensor on spectrum of detecting radiation in fullfield lowcoherence microinterferometer is investigated. Dependence of interference pulse shape and period of interference fringes on the spectrum is shown. Simulated results and experimental measurements of integral transmission spectrum of Linnik microinterferometer with the silicon monochrome image sensor and thermal light source are presented.

Investigation of «Erythrocyte – Plasma» Complex in Native Human Blood Slide Using WhiteLight FullField Microinterferometry

Authors: Kalyanov A. L., Malinova L. I., Bogolyubova E. V., Smirnov I. V., Lychagov V. V., Ryabukho V. P.

Morphofunctional properties of erythrocytes in native blood slide of coronary heart disease patients are investigated using white light fullfield microinterferometry. Three dimensional images and surface profiles of complex «single RBC – surrounding blood plasma» are shown. Dynamic of slope angle of the plasma near the RBC during standardized intravenous glucose load is explored. The dynamic of patients with coronary heart disease is compared with one of patients with coronary heart disease and diabetes mellitus.

The Study of Nail Bed Microcirculation by Laser SpeckleImaging Technique

Authors: Agafonov D. N., Timoshina P. A., Vilensky M. A., Fedosov I. V., Tuchin V. V.

The applicability of laser speckle contrast analysis technique for study of nail bed microcirculation parameters was investigated. Parameters and their dynamics were considered using calibration data obtained with biotissue phantom. Optimal conditions of formation and registration of speckle images were discussed and program for adaptive operation and processing was presented. The data of microscopic observations of nail bed capillary network was used to verify the results of speckle visualization.

Contrasting in Optical Coherence Tomography Imaging of Liver by Nanoparticles

Authors: Genina E. A., Kinder S. A., Bashkatov A. N., Tuchin V. V.

Possibility of improvement of inner liver structure visualization in optical coherent tomograms by increasing their contrast due to administration of titanium dioxide nanoparticles in various suspensions and at various methods of delivering of the particles into the tissue is considered. Values of contrast of inner liver structures in vitro are obtained.

Visualization of Penetration of TiO2 Nanoparticles into Tooth Tissues Samples Using Optical Coherence Tomography

Authors: Trunina N. A., Tuchin V. V.

Penetration of nanoparticles into the tooth tissues is of significant interest in solving the problems, related to the reduction of the tooth sensitivity, enamel strengthening and restoration and cosmetic bleaching. In the present paper we demonstrate the possibility to use optical coherent tomography for visualization of penetration of nanoparticles into the tooth tissues.

Calculation of Structure and IR Spectrum of the 2,3-di-O-nytro-methyl-β-D-Glucopyranoside Molecule by Density Functional Method

Authors: Babkov L. M., Ivlieva I. V., Korolevich M. V.

Structural-dynamic models of the 2,3-di-O-nytro-methyl-β-Dglucopyranoside molecule are constructed by density functional method in basis 6-31G(d). Energies, structures, dipole moments, polarizabilities, frequencies of normal modes in harmonic approximation and IR intensities have been calculated. Interpretation of IR absorption spectrum is presented in range 600–3700 cm–1. Advantages of model, which was constructed, compared with model, which bases on using valence-force field method and valency-optical theory, are discussed.

The Perspective Slow-wave Systems of Terahertz Band for TWT

Authors: Bushuev N. A., Davidovich M. V., Shilovsky P. A.

In this paper the review of terahertz perspective slow-wave systems is presented for TWT.

The methods of modeling have been considered and some numerical results are presented.

Analysis of Fruit Juices Using a Hollow Core Photonic Crystal Waveguides

Authors: Zaniewska A. A., Malinin A. V., Skibina J. S., Tuchin V. V., Chaynikov M. V., Beloglazov V. I., Silokhin I. Y., Ermakova A. M.

The aspects of application of the hollow core photonic crystal waveguides for spectroscopic analysis of liquid medium were considered. The possibility of using these structures for analysis of a fruit juice was evaluated. The principles of processing of photonic crystal waveguide transmission spectra, which is sensitive to quality of juice, its composition, and main component concentration, were revealed.

Physics

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