Summaries of the Issue
OPTICAL SOLITONS IN TWO-LEVEL ATOMS MEDIA Sergey Sazonov
The article deals with a methodical review of nonlinear equations derivation describing the interactions between laser pulses and two-level atoms system and having optical solitons as equations solutions. Propagation of resonant and quasi-resonant envelope solitons and few-cycle pulses solitons with the temporal duration from nanoseconds to femtoseconds are considered. This review is intended for students acquainted with general physics, post-graduate students and scientists specializing in different areas of modern physics.
PHOTONICS AND OPTICAL INFORMATICS
DIELECTRIC OPTICAL NANOANTENNAS Krasnok Alexander E , Belov Pavel Alexandrovich, Kivshar Yuri S
The article deals with a new, alternative to plasmonics approach to optical nanoantennas development. This approach is based on replacement of the metallic structural components of the well-known plasmon nanoantennas by the dielectric nanoelements with a high and positive dielectric conductivity value. As a result, nanoantennas acquire the unique properties, such as magnetic response and superdirectivity. The main types of studied optical antennas are Yagi-Uda and superdirected nanoantennas on the base of dielectric nanoparticles. Keywords: nanoantenna, quantum source, directivity.
MODE CONTROL FOR SYSTEM OF COUPLED SPLIT-RING RESONATORS BY MEANS OF LIGHT Kapitanova Polina V, Belov Pavel Alexandrovich
The article deals with implementation of magnetic metamaterials in microwave frequency range tunable by means of light. Characteristics of a split-ring resonator with integrated voltage variable capacitor for frequency re-tuning, and a photodiode, for applying a DC bias, dependent on illumination are investigated. It is shown, that illumination change shifts the resonant response of the resonator up or down in frequency depending on the photodiode polarity. A system of coupled split-ring resonators is considered and system's response splitting is shown to the clear (bright) and fuzzy (dark) modes by means of light.
BAND-GAP STRUCTURE ANALYSIS OF PHOTONIC CRYSTAL WITH MULTIPLE OPTICAL LAYERS LENGTHS FOR TERAHERTZ FREQUENCY RANGE Alaudi Denisultanov, Khodzitskiy Mikhail K
The article deals with formulas deduced for the infinite photonic crystal for exact definition of band-gap boundaries and width, center and edges of photonic crystal stopband with multiple optical layers lengths in twolayer cell in the frequency range from 0.1 to 1 THz. The formulas were tested by numerical simulation of photonic crystals using the transmission matrix method and method of finite-difference time-domain for the first, second and third multiplicity of optical layers lengths in two-layer cell of the photonic crystal. The formulas for the second multiplicity were experimentally confirmed.
OPTICAL AND OPTICAL ELECTRONIC SYSTEMS. OPTICAL TECHNOLOGIES
OPTICAL AND OPTICAL ELECTRONIC SYSTEMS. OPTICAL TECHNOLOGIES LABORATORY SPECTROPHOTOMETER FOR VISIBLE SPECTRAL REGION Akmarov Konstantin, Nikolay P. Belov, Yuri Smirnov, Sherstobitova Alexandra S., Ekaterina Scherbakova, Yaskov Andrey D.
Design features and basic technical-performance characteristics of laboratory spectrophotometer for visible spectral region (λ = 380-760 nm) are considered. Results of device approbation are given, as well as examples of its application for photo-optical bleaching, toning and coloring technologies control of paper.
SELECTION AND CALCULATION OF OPTOELECTRONIC SYSTEM ITEMS WITH OPTICAL EQUISIGNAL ZONE FOR VERTICAL TEMPERATURE GRADIENT MEASUREMENT OF THE AIR PATH Vadim Gusarov, Alexander N. Timofeev
The article deals with selection and calculation of optoelectronic system basic parameters with optical equisignal zone to measure the vertical temperature gradient of the air path, which is the main factor having an influence on the refraction angle. Selection feature of radiation sources for polychromatic equisignal zone creation is considered which means the necessity of one wavelength radiation selection from the blue spectrum and another – from infrared. Objective is selected for the base direction set, based on the calculated diameter of the transmission exit pupil and the requirement of the spherical aberration minimum value. Energy calculation is done, diameter of the pupil is selected and receiver system objective is chosen. The way of radiation combining is defined and optical system for the base direction set is proposed with four two-lens condensers.
DYNAMIC VISUAL ACUITY EXPERIMENTAL DETERMINATION Yulia Rotts, Musalimov Victor M
Dynamic visual acuity is an important visual capacity indicator of individuals connected with the perception of moving objects. According to the existing patent, a device working model that contains a rotating cylinder with a table of optotypes is created. Operation and calculations of the unit are carried out by the authors’ programs. The average value of dynamic visual acuity, measured for 42 patients is equal to 25 ms. Statistical analysis in MATLAB showed that the distribution of the experimental data corresponds to the Weibull distribution law with parameters: scale A=22.029 and form B=1.527. The statistical hypothesis is confirmed by the Kolmogorov-Smirnov test.
PARAMETERS CALCULATION OF OPTICAL FILTER WITH ANGULAR SELECTIVE LIGHT TRANSMISSION Zakirullin Rustam S
An algorithm for geometric parameters calculation of the grating optical filter with predetermined angular selective characteristic of the light transmission is developed. For sunlight filtering optimization definition methods for inclination angles of the filter gratings are developed for the windows with different azimuths of orientation to the corners of the earth for given geographic location coordinates and the estimated time of the year and day. Results application will give the possibility to achieve the optimum lighting conditions and room insolation by pre-adaptation of the filter parameters to the known beforehand trajectory of the sun relative to the specified window and will have advantages as compared with venetian blind.
CROSSTALK COMPUTER SIMULATION IN THE INFORMATION-MEASURING FIBER OPTICAL DEVICE Elmira Islamova, Kulikov Andrey Vladimirovich, Plotnikov Mikhail Yurievich
This article deals with the problem of crosstalk that appears as a result of multiple reflections of a single pulse in an array of fiber Bragg gratings. A computer model of crosstalk for a particular design of information-measuring fiber-optical device based on the Bragg grating is created. Developed computer model makes it possible to calculate power, phase, and the routes of all impulses arriving to detector and demodulation section. Calculation of the crosstalk influence level to the interference signals is done on the base of the designed model, and recommendations for the reflection coefficients of fiber Bragg gratings in the array are worked out.
OPTICAL CHARACTERISTICS DEFINITION OF OPTICAL TECHNOLOGY SURFACE ELEMENTS FOR THEIR OPTICAL CONNECTIONS Gorlyak Andrei Nikolaevich, Alexei Novak, Solonukha Vladimir Mikhailovich, Khramtsovsky Igor Anatolievich
The article deals with ellipsometrical researches results of optical characteristics for optical technology surface elements made of sodium and silicate glass K8 at various technological processing. It is shown that equality of average values of thickness and refractive index of surface layers defined for non-uniform and uniform models of reflecting system while detail polishing, is a quality criterion of the polished optical technology elements surface for their optical connections. Comparison of surface elements optical characteristics of the details processed by methods of usual grinding and polishing, deep grinding and polishing and by magnetorheological suspension is carried out. In the latter case it is possible to receive a detail surface with the small thickness of surface layer and deviation of the refractive index from volume value, the small mean square value of a rough surface height.
APLANATIC MENISCUS OPTICAL ENGINEERING Anastasiya Gapeeva, Anna Kovaleva, Tatiana V. Tochilina
Spherical surfaces, forming a stigmatic image of the object center point, are shown to be a special case of the surfaces obtained by Cartesian oval rotating; surfaces of the first and second type form the aplanatic image of the object. Image astigmatism is shown not to be dependent on the thickness of aplanatic meniscus. However, the increase of meniscus thickness causes the petsvaleva curvature decrease of the image surface and the reduction of the longitudinal meridional and sagittal astigmatism components. It is shown that at high numerical aperture, transmittance of incident light beams aplanatic surface of the first type falls sharply, thus increasing the coefficient of light polarization.
CHARACTERISTICS CHANGE OF UV LIGHT EMITTING DIODE CHIP-ON-BOARD ASSEMBLIES AT LONG WORKING TIME ON NOMINAL CURRENT Kseniya Vinogradova, Natalia Seredova
UVA (320–400 nm) light emitting diode chip-on-board (COB) prototypes have been studied. The constructions of the prototype have identical ceramic base, metallization pattern and optical coating but different quantity of chips and their relative position. Dependences of optical and electrical characteristics vis. working time are shown. It has been presented that as quantity of chips in board is increased as the rate of characteristics degradation is intensified. The COBs which had 1.5 times higher radiative power at nominal current, which were flowing throw individual chip, have shown the rate of degradation 3 times higher. It has been worked out in 2% increase of forward voltage and 5% decrease of wall plug efficiency in a period of 1000 hours working.
ANALYSIS AND SYNTHESIS OF COMPLEX SYSTEMS
HYDRAULIC DRIVE CONTROL SYSTEM WITH A STATIC NONLINEARITY COMPENSATION Losenkov Andrei A, Aranovskiy Stanislav V.
A relay-proportional control law supplemented with a static nonlinearity compensation of an electric hydraulic amplifier is proposed to control a position of a hydraulic drive for a linear reference signal tracking. The closedloop stability for suggested control law is shown. Experimental results are carried out on a laboratory prototype of a forestry crane and show high achieved tracking performance.
MATHEMATICAL MODEL AND SIMULATION ALGORITHM OF THE MULTI-TIERED MECHANICAL SYSTEM Demin Anatoly V., Ivan Kovalev
The article deals with design features of mathematical models of complex spatial multi-tiered mechanical systems (position of gravity centers of these systems links are relative to the instrument coordinate system defined by the equations of links motion). Mathematical model and simulation algorithm of similar system is demonstrated on the example of ship viewfinder.
MECHANICS AND MECHATRONICS
Operation of implant placement under soft tissues is described. In this operation, tissues can reach such deformations that nonlinear properties appear. A mass-spring model modification for nonlinear tension operation modeling is developed. A method for elasticity module creating using splines is described. Poisson ratio modeling is done by different stiffness for different types of springs in cubic grid. For stiffness value definition, a system of equations is solved describing material tension. The model is verified by experiment on square sample tension. Tests show that sample tension under external forces is equal to defined nonlinear elasticity module. The accuracy of Poisson ratio modeling is thirty five percent that is better than results of available ratio modeling method.
DEPENDENCE OF THE PIEZOELECTRIC TRANSDUCER REACTANCE ON THE MECHANICAL PARAMETERS OF ITS LOAD Igor Popov
It is shown that the inertial load of the piezoelectric transducer may be provided as an inductive resistance in its power supply circuit, and an elastic load - in the form of a capacitive one. The models of vibrating systems with elements of different physical nature are suggested, in which free harmonic oscillations may appear. It is shown that in the inert-capacitive (mC) oscillatory system a mutual conversion of electric field energy of the capacitor into the solid element kinetic energy takes place; in an elastically-inductive (kL) oscillatory system a mutual conversion of solenoid magnetic field energy into potential energy of the spring takes place.
COMPUTER SYSTEMS AND INFORMATION TECHNOLOGIES
ON DISTORTION ASSESSMENT OF IMAGES MASKING WITH M-MATRICES Anton Vostrikov, Stanislav Chernyshev
The article deals with results of the first experiments on images processing coded with unique M-matrices of the 22 nd order. General data on M-matrices and their place among known types of structured orthogonal matrices are given, and benefits from their implementation for image protection against unauthorized access are briefly substantiated. The extent of distortions influence, caused by lossy compression algorithms implementation and by modeling of a part of information flow loss is estimated as a result of carried out experiments. Peak signal to noise ratio metric and structure similarity index are used as objective figures of arising changes in recovered images after distortion. The main purpose of the paper is to define overall appropriateness of M-matrices implementation for images masking during their transmission or storage in contemporary technical systems.
ADAPTIVE SKIN DETECTOR DEVELOPMENT Rasim Akhunzyanov, Tropchenko Alexander Juvenalievich
The article deals with a novel method for detection of image patches on the video sequences with a color close to the human skin color. The method is based on non-parametric skin detector and motion detector. A naïve Bayesian classifier with incremental learning is used for color classification. Quality estimation of the detector operation is done. Experimental results show the efficiency of the proposed method.
ANAPHORIC RELATIONS IDENTIFICATION BY AUTOMATIC TEXT ANALYSIS Boyarsky Kirill , Evgeniy A. Kanevskiy, Alexandra Stepukova
The article deals with rules working principles for the automatic identification of pronouns antecedents for SemSin semantic-syntactic analyzer. It is shown that by the proper use of morphological, syntactic and semantic information obtained from the parse tree, it is possible to disclosure an anaphoric relations not only within the same sentence, but within a paragraph. Examples of semantic classifier use for the correct determination of the antecedent are given.
SOFTWARE FOR ELEMENTARY PETRI NETS TOPOLOGY AND CLASSIFICATION STUDYING BY THEIR HOMOLOGY GROUPS CALCULATION Taisiya Trishina
The article deals with the software for computing of homology groups and directed homology groups of elementary Petri nets. Calculation method is based on an algorithm for finding the homology groups of the complex of finitely generated free Abelian groups by the Smith normal form. The main idea is in the method for calculating of matrix coefficient of differential that admits a visual inspection. Moreover, the problem of visual constructing a Petri net with the ability to study its dynamics is considered. Examples of manual calculations of homology groups and directed homology groups are shown. User interaction with the developed application is described. Examples are given for creation and computing of the homology groups and directed homology groups by the developed application. The software is implemented in the environment of Embarcadero RAD Studio 2010 by C++ programming language.
AUTOMATIC SEARCH OF LOCAL VARIABLES AND ARGUMENTS OF PROCEDURES IN EXECUTABLE CODE DURING COMPUTATIONAL PROCESS VERIFICATION STAGE Гедич А. А., Anatoly Zykov, Arthur Lazdin
General diagram of computational process engineering and analysis based on semi-graphical model is presented. Analysis of executable code is studied. Brief review of existing algorithms for restoring information about objects on stack is given. Some features, advantages and disadvantages of these algorithms are listed. Alternative approach that combines basic concepts described earlier, new solutions of existing problems and simplicity is described.
INFORMATION SYSTEMS INTEGRATION ON THE BASE OF LINKED DATA TECHNOLOGY Semerhanov Ilya A, Mouromtsev Dmitry I
The article deals with the method of computer systems integration using traditional relational data warehouse, based on technology of linked data. The issue of interoperability of these systems and the problems of their security are touched upon. For implementation of semantic interoperability it is proposed to use semantic technologies, in particular, RDF and RDF Schema data models, ontology description language OWL, query language SPARQL and a common approach for open linked data. R2RMapper software tool developed by the authors is considered intended for retrieval of information, stored in the relational database, into the semantic formats. The algorithm is represented which makes it possible to convert such information into a single information field accessible to all integrable systems.
LASER AND BIOMEDICAL TECHNOLOGIES
HUMAN LOWER LIMBS INVESTIGATION DURING WALKING BY MEANS OF INERTIAL MOTION CAPTURE TECHNOLOGIES Artem Kuznetsov, Musalimov Victor M
The work deals with the methods for the motion parameters measuring of the human locomotive system lower limbs. The main attention is given to walk cycle parameters studying. The technology of inertial motion capture is used. Experiments have been conducted on the study of human walking with the use of wireless measuring devices equipped with accelerometers. Methodology of the walk cycle parameters study is chosen and described. Also, attention is given to selecting method of measuring devices mounting places on the human body, using the experience of Turner Research and Development Child Orthopedic Institute (Saint Petersburg, Russian Federation). Movement phases configuration of the lower limbs during human walking is described, and comparison between movement phases and experimental data is shown.
MATERIALS TECHNOLOGY AND NANOTECHNOLOGIES
PHOTOCHEMICALLY INDUCED LUMINESCENCE POLARIZATION OF CdSe/ZnS QUANTUM RODS IN POROUS MATRIX Mukhina Maria V , Maslov Vladimir G, Baranov Alexander Vasilievich, Fedorov Anatoly V
Selective photochemical reaction in initially disordered ensemble of quantum rods, embedded in porous matrix, under continuous irradiation with polarized light is carried out. Photochemical reaction resulted in an appearance of photoinduced anisotropy of the nanocrystals luminescence. A specific dark process of anisotropy relaxation lasting around 10 minutes is observed. This process is presumably induced by rotational diffusion of nanocrystals in pores of the matrix. A bi-exponential time dependence of quantum rod luminescence intensity in photochemical reaction is attributed to the development of two photoinduced processes: photoinduced luminescence enhancement and photooxidation.
THE EFFECT OF FULLERENE C60 ON THE MECHANICAL BEHAVIOR OF EPOXY RESIN Dmitry Pikhurov, Zuev Vyacheslav Viktorovich
Fullerene C60 / epoxy polymers nanocomposites with different C60 loading (0.01-0.12 wt.%) have been prepared. Mechanical testing shows that mechanical and toughening properties of composites are greatly improved. The addition of fullerene C60 increased the modulus of elasticity and (up to 20%) and shock resistance nearly three times, but the glass transition temperature was unaffected. The measured shock resistance was also increased, from 38 to 115 kJ/m2 with the addition of 0.12wt.% of fullerene C60. The toughening mechanism has been discussed. With the dielectric spectroscopy it is shown that the destruction mechanism changes are caused by the growth of intermolecular interactions of nanoparticle - matrix and, as a result, retardation of the molecular chains mobility in the polymer matrix.
INSTRUMENT-MAKING TECHNIQUE. ORGANIZATION OF PRODUCTION
WELDS QUALITY CONTROL DURING WELDING BY MEANS OF ACOUSTIC EMISSION Barinov Andrei V., Fedorov Alexei V, Kinzhagulov Igor Yu, Sergeev Dmitry S, Anna Dorenskaya
The article deals with the problem of welds quality control while welding process. A method of acoustic emission is suggested for quality control, with a set of possible methods for filtering signals. Analysis of the existing methods is done and the most informative ones are chosen on the base of it. Analysis methods of the obtained signals are represented: by the growth rate of the rising edge and the waveform. Information content of the chosen methods is confirmed experimentally. Experimentally obtained data are given showing the changes in signal characteristics in defects simulation (insert Ti, W) during welding.
INFORMATION SECURITY METHODS AND SYSTEMS
VULNERABILITY ANALYSIS OF ROBOTIC SYSTEMS WITH SWARM INTELLIGENCE Igor A. Zikratov, Kozlova Ekaterina Vadimirovna, Zikratova Tatyana Viktorovna
Information security issues for group mobile robotic systems with swarm intelligence are considered. Impact ways of the opposed party to a swarm algorithm are discussed. The numerical simulation of the possible information destructive effects on robotic swarms systems is done. The possibility of unique threat implementing to teams of robots - a swarm reflexive control from the attackers side – is shown. Demands to perspective mechanisms of information security support for swarm systems are justified.
A METHOD FOR INTEGRATED ASSESSMENT AND ANALYSIS OF REGIONAL SOCIOECONOMIC SYSTEM GLOBAL SECURITY BASED ON COGNITIVE MODELING
A method for integrated assessment of regional socio-economic system security based on global security integral index synthesis and analysis has been proposed for adaptive management trajectories synthesis problem-solving of the region, adequate to regional development strategies. The method provides a possibility to formalization and computational solution of complex loosely-structured dynamic systems risk-sustainable development trajectories synthesis problems within the multidimensional criteria space on the basis of cognitive modeling.
NEW TECHNOLOGIES IN EDUCATION
EXPERIMENTAL LEARNING METHOD OF SPRING PENDULUM DAMPED OSCILLATIONS ON AN INCLINED PLANE Olga Revinskaya, Nadezhda Kravchenko
The article deals with laboratory research model for damped oscillations of a spring pendulum on the inclined plane in the presence of sliding friction in system. This model is an example of non-exponential nature of the harmonic oscillations attenuation which explanation is possible within a general physics course. It is shown that oscillations of such pendulum take place with the constant frequency, equal to own fluctuations of a spring pendulum, meanwhile oscillation amplitude decreases by identical size every half-period. On the basis of the offered research technique it is possible to define the sliding friction force. The offered didactic model is realized in the form of two laboratory works: computer and natural. The works promote expansion of students’ representations about research methods of damping oscillations in systems with various nature of the environment resistance.
THE INFLUENCE OF COMPLEX FORMATION EFFECT BETWEEN POLYSILANE AND FULLERENE C60 ON THE ABSORBANCE SPECTRA AND OPTICAL LIMITING Zuev Vyacheslav Viktorovich, Sergei Bronnikov, Sergei Kostromin, Sergei Serov, Svetlana Likhomanova, Mikhail Borkovsky, Natalia Kamanina
The concentration dependence of absorbance of polymethylphenylsilane (PMPS) /fullerene C60 solution has been studied. It is shown that at fullerene C60 doping more than 0.8wt.%, the absorbance shows the bathochromic shift, proving PMPS and fullerene C60 complex formation. This complex can be used as optical limiting medium in visible range.
ON PROJECTILE AERODYNAMICS FOR A SLING Yulia Ganziy, Nikolai Mityukov
The article deals with flow simulation of a projectile for a sling in ANSYS CFX, aerodynamic parameters of the rotating projectile are determined in the speed range of 0-50 m/s and the angular velocity of 0-15 1/s. It is shown that the structure of the medieval slings was to ensure minimal projectile twisting, and the speed range probably did not exceed 40-50 m/s.
URGENT COMPUTING FOR SCHEDULING AND DISPATCHING OF PUBLIC CONVEYANCES Timofei Tchurov, Konstantin Knyazkov, Ivanov Sergey V, Alexei Doukhanov, Boukhanovsky Alexander V
Urgent computing platform for operational forecast and traffic optimization is announced for St. Petersburg public conveyances control.
SIMULATION OF PROTEINS CONFORMATIONAL-BASED FEATURES FOR RATIONAL DRUG DESIGN BY CLAVIRE CLOUD ENVIRONMENT Dmitry Spelnikov, Porozov Yuri B, Maslov Vladimir G, Boukhanovsky Alexander V
CLAVIRE-based cloud simulation environment is announced for computational support of rational drug design on the base of recombinant proteins.
AUTOMATIC METHOD OF THE MOLECULAR MECHANICAL POTENTIALS DETERMINATION FOR COARSE-GRAINED REPRESENTATION OF THE MOLECULAR SYSTEM Svitenkov Andrey, Ekaterina V. Bolgova , Maslov Vladimir G, Boukhanovsky Alexander V
The article deals with multipurpose automatic method of the molecular mechanical potentials determination based on quantum-chemistry. Common problems of classical molecular mechanical potentials application are described. Suggested method is advisable in the cases if these problems are intricate or potentially inaccurate. It also gives the possibility to increase comparability of modeling results.