J. A. Andrade Lucio University of Guanajuato, Mexico M. V. Andrés Bou University of Valencia, Spain A. Y. Bekshaev Odessa I. I. Mechnikov National University, Ukraine G. Belenky Stony Brook University, New York, USA T. Benson University of Nottingham, Nottingham, UK K. Bliokh CEMS, RIKEN, Japan P. Chamorro-Posada Universidad de Valladolid, Valladolid, Spain R. De La Rue University of Glasgow, UK A. Desyatnikov Nazarbayev University, Kazakhstan S. Donati University of Pavia, Italy O. O. Drobakhin Oles Honchar Dnipropetrovsk National University, Ukraine V. I. Fesenko Institute of Radio Astronomy, National Academy of Sciences, Ukraine A. F. Glova State Research Center TRINITI, Troitsk, Russian Federation V. I. Grygoruk Taras Shevchenko National University of Kyiv, Ukraine I. V. Guryev University of Guanajuato, México Ch. Jagadish Australian National University, Canberra, Australia V. A. Katrich V. N. Karazin Kharkiv National University, Ukraine H. Kawaguchi Nara Institute of Science and Technology, Japan M. Koshiba Hokkaido University, Japan A. V. Kudryashov Moscow State Open University, Russian Federation A. Lavrinenko Technical University of Denmark, Denmark M. Marciniak CAOL TPC Co-Chair, National Institute of Telecommunications, Poland V. A. Maslov Conference General Co-chair, V. N. Karazin Kharkiv National University, Ukraine R. Morandotti University of Quebec, Canada A. M. Negriyko CAOL TPC Co-Chair, Institute of Physics, National Academy of Sciences, Ukraine A. I. Nosich Institute Radiophysics and Electronics, National Academy of Sciences, Ukraine E. Odarenko Kharkiv National University of Radio Electronics, Ukraine M. F. Pereira Institute of Physics, Czech Academy of Sciences, Czech Republic S. L. Prosvirnin Institute of Radio Astronomy, National Academy of Sciences, Ukraine S. N. Shulga V. N. Karazin Kharkiv National University, Ukraine O. V. Shulika University of Guanajuato, México V. A. Smyntyna CAOL TPC Co-Chair, Odessa I. I. Mechnikov National University, Ukraine G. S. Sokolovskii Ioffe Physical-Technical Institute, Russian Academy of Sciences, Russian Federation M. S. Soskin Institute of Physics, National Academy of Sciences, Ukraine K. Staliunas Polytechnic University of Catalonia, Spain S. I. Tarapov Institute of Radiophysics and Electronics, Ukraine V. R. Tuz Jilin University, China M. V. Vasnetsov Institute of Physics, National Academy of Sciences, Ukraine L. P. Yatsenko Institute of Physics, National Academy of Sciences, Ukraine
This paper discusses the optimization problem based on cat swarm optimization by introducing elements of a random search in a stochastic modification of the basic procedure into the seeking and tracing modes, that improves the speed and accuracy of determining the direction of movement in the seeking mode and improves the global properties of the procedure in the tracing mode. The proposed optimization method, being a representative of evolutionary algorithms, is intended for using hybrid systems of computational intelligence and, above all, in learning tasks of artificial neural networks, neuro-fuzzy systems, as well as in clustering and classification problems.
The method for solving initial-boundary electromagnetic problems is proposed. It uses the Green's function method and the Laplace and Meler-Fock integral transforms in a time domain. The model problem of special slotted cone antenna excitation is studied. Integral and series representation of electromagnetic field component are given.
A new technique of radially polarized laser beams generation by suppressing the main mode of a gas laser in the case of a Brewster prism coupler placed in the laser cavity as a source of controlled intracavity losses and as a laser beam output coupler is proposed. The suppressing of the main intracavity mode leads to domination of the transverse electromagnetic (1,0) mode. Its electric field distribution has mirror symmetry for intensity and polarization. The obtained radially polarized beam is the result of the superposition of the outputted by the prism input face beam with one been rotated 90 degrees with mirrors.
In the present study we have focused on synthesis and characterization of nanocomposite for photodynamic therapy. The nanocomposite consisted of gold nanoparticles and photosensitizer Chlorin e6 incorporated into star-like polymer Dextran-graft-Polyacrylamide. The behavior of three-component nanosystem in the region of physiological temperatures was studied by using Dynamic Light Scattering. A small change in the size of polymer aggregates was observed at an increase in temperature from 25 ° C to 45 ° C. However, size of gold nanoparticles remained around 10 nm at all temperatures. The absorption spectra of nanosystem revealed the interaction of the photosensitizer Chlorine e6 with gold nanoparticles.In vitro testing of studied nanocomposite efficiency for Photodynamic therapy was carried out on the sub-lines of breast carcinoma MCF-7/S; MCF-7/Dox, and Jurkat cells. After irradiation with laser the death of 68.4% of MCF-7/S cells was registered. However, for MCF-7/Dox cells - 24.9%, for Jurkat cell line - 20 %. It was proved that prhotodynamic efficacy of proposed nanocomposite was depended on malignant cells type, while slight aggregation process not significantly affected nanosystem activity.
The mathematical model of the process of heating of biological media by continuous and pulsed laser radiation was created and investigated. The dimensions of the heated area, the time of heating are determined. It is necessary use blue or green laser radiation for creating a local area. The thermal time constant of the process is a few minutes. Therefore, the radiation of the pulse-modulated radiation differs from the constant power only with periodic of pulses more than 1 minute.
In this paper, the autoconvolution method was investigated to determine the position of the longitudinal axis of the photonic crystal fiber and to determine the center of the mode field in the cross section. Knowing the center of the PCF mode field, one can determine the cross section in which the diameter of the mode field will be maximal. This allows a more precise positioning of two identical PCF during connection. The proposed method allows improving the quality of the positioning of the PCF by transverse, angular, longitudinal displacements, and also by the mutual angle of rotation of the connected PCFs.
Application of Monte Carlo technique for optimization of wearable photoplethysmography (PPG) pulse rate sensors is suggested. The paper describes a numerical method of effective response estimation of PPG sensors taking into account penetration depth of radiation into multilayered tissue structure. The principle and photon propagation rules, which are needed for simulation are described. PPG sensor structure with 7 layer tissue parameters are presented. We show, that using the simulation results in designing the PPG pulse rate sensor optical part will enhance the level of useful received signal by the photodiode.
In this paper, we consider theory of self-organization of periodic coupled temperature and strain (TS) fields on surfaces of anisotropic (transversely isotropic) solids irradiated by laser pulses. Laser-induced thermal field is treated as consisting of "atomic point defects" of a crystalline lattice - thermal phonons. The self-organization of TS structures occurs due to strain-thermal instability associated with a strain-induced flux of thermal phonons. Using the non-local forms of constitutive equations, a synergetic model of the process is formulated and substantiated, based on self-consistent dynamic equations for temperature and atomic displacements fields of the elastic continuum. Dispersion equation for instability is obtained and analyzed. It is observed that the length of non-local defectatom interaction has a significant effect on the characteristics (growth rate, period) emerging strain-temperature surface structures. The period of these structures is proportional to the intrinsic length parameter and has a nanometer scale.
In the work presented is the theoretical description of optimal focusing of extended laser beam at long distances (over 1km). It is shown that in general case the optimal focusing condition does not coincide with the condition of formation of laser beam waist. The approximation is formulated, when the optimal focusing coincides with the beam waist. Obtained is the theoretical and experimental confirmation of linear dependence of minimum diameter of focusing spot from the focusing distance.
The formation of a complex field in an optical correlator consisting of a set of phase gratings separated by layers of space is investigated. We found conditions when the redistribution of intensities in the output diffraction orders in such a correlator is very sensitive to a small transverse shift of the input interference pattern of light. Registration of changes in the angular spectrum can be used as an effective sensor to monitor small displacements, including the nanoscale range.
The noise control method is based on the occurrence of thermal noise, which is essentially created by ions or free electrons, due to their movement under the influence of the potential difference. This method is very relevant in our time, because it does not harm the human body, but further research is needed to establish the authenticity of control. The paper deals with issues related to the calculation of the uncertainty of the point control of the temperature of the skin of the lower extremities of a person and the diagnosis of the state of vessels.
Distributed informative systems which unite the technology of client's server with global web have posed numerous problems. It turned out that standard methods of identification have already become obsolete. Particularly the problem is that the generally accepted division of methods of a control over physical access and a control over access to information are not effective any more. To solve this problem there is a need to apply for the methods of identification which will have possibility to identify users with the help of aggregate of actions implemented by users in the process of work with DIS.
Directive properties of monopole nano-antenna formed by carbon nanotube placed perpendicularly to metal rectangular screen are investigated. On the base of the method of the uniform geometric diffraction theory the asymptotic solution of the 3D vector problem of diffraction of the field of impedance monopole with radius r and length l placed on the ideally conducting rectangular screen is obtained. The fast-active algorithms and software for calculating 3-D patterns of this radiating system are developed. Analysis of the radiation patterns and directivity versus the screen sizes is carried out.
The features of luminescent properties of tin dioxide in the form of an ensemble of nanoparticles within the matrix of porous silicate glass with column structure are studied. The ensemble was formed by impregnating the glass with an alcoholic solution of SnCl4 followed by annealing. The type of glass and concentration of the impregnating solution, which corresponds to the best luminescent response, is established. The results of the work may be applied for the production of fluorescent gas sensors based on SnO2.
The change in the membrane-dependent properties of red blood cells under the influence of laser radiation in the middle infrared (mid-IR) (λ = 9.8 μm) and terahertz (THz) (λ = 70.6 μm) bands was studied. The parameters of acid hemolysis (its rate and intensity as well as the level of the primary products of lipid peroxidation of red blood cells membranes) were used as the indices of erythrocytes state. The obtained data suggest the multidirectional laser effect (depending on its band) may be caused by different acceptors in the cells and their components, for instance, the intercarbon bonds in fatty acids of lipid bilayer (for mid-IR), water molecules (for THz).
A difference-frequency generation in the external cavity of a dual-wavelength semiconductor disk laser (SDL) is numerically studied. The dual-wavelength SDL itself has been designed to emit two optical beams simultaneously - the short-wavelength beam (usually referred to as the pump) and the long-wavelength beam (signal). The study is performed with the help of the mathematical model based on a set of ordinary differential equations with a time delay. The model takes into account possible absorption of the pump radiation in the active region designed to provide gain for the signal. The steady state operation point, its stability, and transient dynamics of intra-cavity difference-frequency generator (ICDFG) are analyzed. As the pump radiation absorption exceeds the critical value, the operation point is shown to lose the stability within the certain interval of the primary pomp power. The steady-state instability of the ICDFG develops to the multi-scaled oscillations of high amplitude.
The article discusses the use of bimorph adaptive mirrors to improve the focusing of laser radiation. The criterion of focusing efficiency is the fraction of the energy of the laser radiation passing through the pinhole located in the focal plane of the focusing lens.
The periodic gratings are effectively used for producing modern electronics and radio engineering equipment and complexes. The electromagnetic wave diffraction problem for cone gratings is considered. Impedance boundary conditions at cone structure are proposed. The problem of electromagnetic wave diffraction on cone gratings with imperfectly conducting strips is studied. Diagrams of electromagnetic field distribution are given.
The paper presents the current state of photomedicine and its place in medicine of the 21st century.
