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Chernivtsi, Ukraine

Chernivtsi National University is the leading Ukrainian institution for higher education in northern Bukovina, in Chernivtsi, a city in western Ukraine. Wikipedia.

Zenkova C.Y.,Chernivtsi National University
Applied Optics | Year: 2014

Theoretical and experimental approaches to diagnosing internal spin and orbital optical flows and the corresponding optical forces caused by these flows are offered. These approaches are based on the investigation of the motion of the particles tested in the formed optical field. The dependence of the above-mentioned forces upon the size and optical properties of the particles is demonstrated. The possibility of using kinematic values defining the motion dynamics of particles of the Rayleigh light scattering mechanismto make a quantitative assessment of the degree of coherence ofmutually orthogonal waves that are linearly polarized in the incidence plane is demonstrated. The feasibility of using the above mentioned approach, its shortcomings, and its advantages over the interfering method for estimating the degree of coherence are analyzed. © 2014 Optical Society of America. Source

Ushenko Y.A.,Chernivtsi National University
Opto-electronics Review | Year: 2011

The optical model of human joints synovial fluid is proposed. The statistic (statistic moments), correlation (autocorrelation function) and self-similar (Log-Log dependencies of power spectrum) structure of polarization two-dimensional distributions (polarization maps) of synovial fluid has been analyzed. It has been shown that differentiation of polarization maps of joint synovial fluid with different physiological state samples is expected of scale-discriminative analysis. To mark out of small-scale domain structure of synovial fluid polarization maps, the wavelet analysis has been used. The set of parameters, which characterize statistic, correlation and self-similar structure of wavelet coefficients' distributions of different scales of polarization domains for diagnostics and differentiation of polycrystalline network transformation connected with the pathological processes, has been determined. © 2011 Versita Warsaw and Springer-Verlag Wien. Source

Performed in this work are complex statistical, fractal and singular analyses of phase properties inherent to birefringence networks of protein crystals consisting of optically-thin layers prepared from blood plasma. Within the framework of a statistical approach, the authors have investigated values and ranges for changes of statistical moments of the first to the fourth orders that characterize coordinate distributions for phase shifts between orthogonal components of amplitudes inherent to laser radiation transformed by blood plasma with various pathologies. In the framework of the fractal approach, determined are the dimensions of self-similar coordinate phase distributions as well as features of transformation of logarithmic dependences for power spectra of these distributions for various types of hominal mammary gland pathologies. © 2012 World Scientific Publishing Company. Source

We investigate the processes of laser radiation transformation by biological crystal networks using the singular optics techniques. The obtained results show a distinct correlation between the points of " characteristic" values of coordinate distributions of Mueller matrix (M ik = 0, ±1) elements and polarization singularities (L- and C-points) in laser images of biological crystal networks with the following possibility of Mueller-matrix selection of polarization singularity. The technique of Mueller-matrix singular diagnostics of pathological changes in a woman's reproductive sphere tissue (myometrium) is proposed. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

Kosyachenko L.,Chernivtsi National University | Toyama T.,Osaka University
Solar Energy Materials and Solar Cells | Year: 2014

A comparison of the calculated results with the experimental data shows that the measured dark I-V characteristics of efficient thin-film CdS/CdTe cells are quantitatively described in terms of the Sah-Noyce-Shockley theory of generation-recombination in the space-charge region of the heterostructure. The expressions for the quantum efficiency spectra, taking into account the drift and diffusion components and recombination on the front and rear surfaces of the CdTe absorber layer, also describe the observed spectra in detail. The process of comparison and adjustment of the calculated results with the actual measurements provides a quite accurate determination of the main parameters of the CdTe layer and the diode structure, which in turn enables us to make some recommendations to correct these parameters to increase the efficiency of CdS/CdTe solar cells. © 2013 Elsevier B.V. Source

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