Summaries of the Issue
NEW TECHNOLOGIES IN EDUCATION
INNOVATIVE SYSTEMOF EDUCATION SPECIALISTS IN SOFTWARE DESIGN SPHERE IN St.P SU ITMO Vladimir N. Vasiliev, Vladimir Parfenov, Shalyto Anatoly A.
Saint Petersburg SU ITMO is invariably among the top three world-rate universities training specialists in the field of software design and production. These achievements depend to a large extent on development and implementation of the innovative specialist training system based on combination of design and competitive approaches into educational process. Scientific and methodological aspects of such system construction are considered in the article. Its efficiency is proved by another triumph of our university team at the Programming World Championship ACM ICPC in 2009.
CORE TRAINING MONITORING IN SENIOR HIGH SCHOOL: DEMAND AND SUPPLY ANALYSIS Tatiana Getmanskaya, Dmitry Grinshpun, Vladimir Korolyov, Stafeev Sergey K.
This article describes method, process and results of the monitoring devised to investigate the core training system in Senior High School. The description includes actuality, criteria, hypotheses, organization, research, mathematical and presentation methods, main results and conclusions.
PHOTONICS AND OPTICAL INFORMATICS
SPECTRAL PROTOTYPES OFMAXWELL EQUATIONS IN DIELECTRICMEDIUMWITH NON-RESONANCE DISPERSION AND INSTANTANEOUS CUBICAL NONLINEARITY Dmitry V. Ivanov, Kozlov Sergei A
From Maxwell equations we deduced the combined equations describing the evolution of overlarge space-time spectra of light waves in homogeneous isotropic dielectric medium with arbitrary dependence of linear index of refraction and instantaneous cubical nonlinearity. We’ve got analytical iterative solution of the acquired combined equations. Solutions of the linearized combined equations are illustrated by the results of numerical simulation of femtosecond wave packet of a few optical oscillations propagation in a fused silica.
INVESTIGATION OF IMAGE REPRESENTATIONS IN OPTICAL COHERENT TOMOGRAPHY USING INFORMATION CRITERIA Volynsky Maxim Alexandrovich, Gurov Igor P, Potapov Alexey Sergeevich
Representations of optical coherent tomography (OCT) images are investigated. Objective quality criterion of representations is introduced on the base of recently developed principle of representational minimum description length (RDML). Segmentation algorithm is proposed that detects layered structure of OCT images and can be used in morphological analysis of biological tissues, especially, in disease diagnostics. It is shown, that value of RMDL criterion is in accordance with expert estimation of adequacy of segmentation results. Thus, this criterion can be utilized for further investigation and improvement of OCT image analysis algorithms.
PHOTOLUMINESCENTMANIFESTATION OF INTERACTION BETWEEN CdTe QUANTUM DOTS ANDMETAL IONS INWATER SOLUTION Anna Savelyeva, Mukhina Maria V , Orlova Anna O , Maslov Vladimir G, Baranov Alexander Vasilievich, Fedorov Anatoly V
The dynamics of CdTe quantum dots (QDs) clustering in water solutions in the presence of metal ions (Pb2+, Cr3+) is investigated. The data were obtained using absorption and fluorescent spectral analysis and fluorescent lifetime analysis. We observed that in the presence of lead ions CdTe QDs tend to form stable clusters of certain size. The results provide evidence of energy transfer between CdTe QDs inside formed clusters.
LASER AND MEDICAL TECHNOLOGIES
SURFACE CLEANING OF GLASSMICROCHIP AFTER BIOLOGICAL SAMPLES ANALYSIS Anatoly Evstrapov, Alexandra Tupik
The paper discusses the problems connected with realization of polymerase chain reaction (PCR) on a microchip. The results of cleaning of glass microchip after PCR with the chromic solution, sodium hypochlorite solution (1%), sulfuric acid and hydrogen peroxide solution (3:1) and TE buffer solution are presented. It is confirmed that the sodium hypochlorite solution and chromic one are applicable for surface cleaning.
COMPARISON OF PLANS FOR NANOPIPETTES AND NANOPROBES LASER DRAWING Victor Matyzhonok, Petrov Andrei Anatolievich
In many areas of science it is required either to obtain data related to an object with nanoscale resolution, or make some action with it accurate within nanometer precision. This article describes two plans for laser extraction of nanopipettes and nanoprobes proposed and used at the Department of Laser Technologies and Environment Instrumentation of SPbSU ITMO. Technical data comparison of these plans and their ease of use are made. Extraction results obtained by these schemes are given.
NONADIABATIC PHENOMENA IN OPTOINFORMATIC POLARITON LASERS Arkhipov Rostislav M, Valentin S. Egorov, Igor A. Chekhonin
At the present time a possibility of developing of new class of coherent light sources – polariton lasers at the room temperatures – is of great interest. Theoretical understanding of generation mechanism in these systems is based on polaritons - quasi-particles, which are a superposition of photons and resonance medium excitations in strong-coupled electromagnetic field and matter. A new effective nonadiabatic method of excitation of polariton lasers with FM mode-locking laser pump is proposed. Nonlinear properties of polariton lasers are investigated.
UNITS AND DEVICES OF TECHNICAL SYSTEMS
CALCULATION OF HYDRODYNAMIC CHARACTERISTICS OF FRANCIS TURBINE RUNNER RO-230 Valery Zolotarevich, Nikolay Yugov
Physical and mathematical model construction of hydroturbine runner for calculation of hydrodynamic flows and behaviors is considered in the paper. Results in three-dimensional calculations are compared with the data received in symmetric axis task and with available experimental data.
THE THEORY OF THEMOSFET ULTRA FAST SWITCHING Vyacheslav Togatov, Peter Gnatyuk, Dmitry Ternovsky
Ultra fast switching process of the high-voltage MOSFET is reported, a switching time constant being less than several nanoseconds. The ultra fast switching mechanism is explained and interpreted in the framework of the given mathematical model. The results of direct experiments confirm the proposed ultra fast switching mechanism interpretation.
THERMAL PHYSICS AND THEORETICAL HEAT ENGINEERING
EXPERIMENTAL INVESTIGATION OF REVERSED PROCESS OF BROWN COAL BED GASIFICATION WITH AIR AND OXYGEN BLOWING Igor Mikhalyov, Sergey Islamov
Experimental investigation of reversed process of brown coal bed gasification with air and oxygen blowing has been carried out. Advisable regimes for the considered process with air blowing have been determined. Significant acceleration of the process due to the use of oxygen blowing has been established. Ways of intensification of the process depending on exact purpose of its use have been formulated.
MATERIALS SCIENCE AND NANOTECHNOLOGIES
SINGLE NANOWHISKER FORMATION ON THE TOP OF CANTILEVER FOR SCANNING PROBE MICROSCOPY Alexander Golubok, Alexander Kovrov, Vadim Levichev, Ivan Mukhin, Oleg Prihodko
Methods of whisker growth like molecular beam epitaxy, metall organical vapor deposition, growth with electrolysis, method of laser ablation are very popular at present. In this work we offer extension of noncontrol self-organized whisker growth method by the action of the electron beam. Introduced method supposes to control geometry growth and properties of whiskers. Single whisker growth technology can be applied in scannig probe microscopy by making superprobe for researching well-branching surface (deep channels and the cavity) and making the points of the cathodes and nanotweezers.
COMPUTER SYSTEMS AND INFORMATION TECHNOLOGIES
MODELING OFMULTISERVICE NETWORK COREWITH RELATIVE PRIORITIZATION OF NON-HOMOGENEOUS TRAFFIC Aliev Taufic Ismailovich, Igor Nikulsky, Vladislav Pyattaev
Queuing network models were developed for urban multiservice network core servicing three types of traffic (voice, video and data). To study the network characteristics (average delay and jitter of different frames types) the combined approach, based on analytical and simulation methods, is used. The study results are based on numerous modeling experiments with different assumptions about traffic characteristics and processing in nodes with relative prioritization.
RESEARCH OF LOSSY IMAGES COMPRESSION METHOD WITH APPLICATION OF ADAPTIVE QUANTIZATION Luzhkov Yuri, Tropchenko Alexander Juvenalievich
The method of values calculation of a quantization vector factors for lossy compression schemes of images, based on using the weight criterion is offered. Comparison of base JPEG scheme and its modification on the basis of the developed method is made. The given modification exceeds JPEG scheme on 10-20 %. Generalization of the method is made for compression schemes on the basis of adaptive segmentation.
QUALITY ASSESSMENT OF BROADCAST TELEVISIONMATERIALS FOR MOBILE TERMINALS Alexander Peregudov, Konstantin Glasman, Alexander Belozertsev, Evgenia Grinenko
The results of experimental study of multimodal quality assessment of compressed television materials for portable and mobile devices are discussed in the paper. There are special requirements because of the limited bandwidth of transmission channels in portable and mobile multimedia production. A kind of optimization should be done and as a result special recommendations should be made to meet such requirements and to provide a reasonable level of integral perceived quality. If dynamic multiplexing and adaptive (content dependent) allocation of video- and audio flows in the range of constant channel bandwidth are being taken into account, it will allow improving the quality of new portable and mobile multimedia applications in broadcast television systems.
AN AGENT-BASED PEER-TO-PEER DISTRIBUTED SYSTEM FOR INFORMATION SUPPORT OF INNOVATIONS Maxim Shishaev
The state-of-the-art research directions in the field of methods and tools development for information support of innovations are considered. A multi-agent peer-to-peer distributed system prototype for information and analytical support of regional innovations has been developed. Proposed scientific solution is based on using of ontologies and agent-based approach for system engineering. System architecture, software modules, functioning principles and application domains are described in detail.
ECONOMICS AND FINANCES. MANAGEMENT
IDENTIFICATION CRITERIA OF CREDIT RISK MODELS BY STATISTICAL DATA Dmitry Strokov, Evgeny Solojentsev
Application analysis of Logical-Probabilistic (LP) risk models is considered, and importance of the identification procedure of risk LP-models by statistical data is showed. Mathematical description of risk LP-models is given. The identification method of risk LP-models is stated and different criteria of identification are proposed and investigated. The recommendations by their applications are given.