Volume 5 Issue 2
ELECTRONIC NETWORK JOURNAL "RUSSIAN TECHNOLOGICAL JOURNAL"
Volume 5 Issue 2
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MICRO - AND NANOELECTRONICS, PHYSICS OF CONDENSED STATE |
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V.V. Krutov, |
TECHNIQUES FOR FORMATION OF FERROELECTRIC PHOTONIC AND PHONONIC CRYSTALS 37 AbstractResearches in the field of technology of creation of ferroelectric photonic and phononic crystals are analyzed. Features of formation of antiparallel ferroelectric domains are examined by various methods. The special attention is given to the industrially-focused techniques with small duration of a work cycle. Results of the works executed in Moscow Technological University are briefly described. The algorithm for calculating the technological parameters of domain structure formation by the acoustic-interference method is developed. The basic parameters of c-axis-oriented PZT films grown on metallic substrates are estimated. It is shown acoustic-interference method allows one to form regular domain structures in PZT films with record-breaking short work cycle duration . The conditions for forming regular domain structures by the double-pulse heterothermal technique are established with regard to new data on heat transfer in films. Keywords: domain engineering, domain ferroelectric structures, photonic crystals, temperature lattices, double-pulse heterothermal technique, acousto-interference technique. |
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A.M. Buryakov |
SECOND HARMONIC GENERATION IN THE CENTROSYMMETRIC ANTIFERROMAGNET LaFeO3 27 AbstractThe paper presents the results of experimental and theoretical studies of nonlinear optical properties of LaFeO3 thin film, which is antiferromagnetic and centrosymmetric, the latter provides prohibition of second harmonic generation in electric-dipole approximation. Spectroscopic studies have shown the presence of the resonant frequency in the spectrum of optical second harmonic generation (SHG) at the pump photon energy 2ћω ≈ 2.85 eV. Comparison of SHG and absorption spectra at the second harmonic wavelength, the new characteristics have been identified, related to the presence of the electronic transition which results in the resonance spectral dependence. The models were suggested for the description of the polarization dependency for the two pump laser wavelengths (non-resonant 800 nm and resonant 860 nm), as well as for the calculation of the nonlinear susceptibility tensor components. The magnetically induced SHG was observed for the conditions of maximal suppression of crystallographic (electric dipole- or electric quadruple) contribution obtained by choice of appropriate polarization rules for the pump and second harmonic waves. Keywords: thin films, antiferromagnetic, second harmonic generation, orthoferrite lanthanum, nonlinear optics, magneto-optical effects, magnetization, polarization switching. |
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A.N. Yurasov |
FEATURES OF THE MAGNETOREFRACTIVE EFFECT IN NANOSTRUCTURES 20 AbstractWe have theoretical investigated the magnetorefractive effect (MRE) in nanostructures. We discuss possibility of magnifications for this effect. MRE can be considered as variations of the coefficients of reflection, transmission and absorption of electromagnetic waves of samples with magnetoresistance (MR) under applied magnetic field. We have deduced formulas for change of the optical constants in magnetic field that does possibility for corrected description spectra of the magnetorefractive effect especially in the near IR region. The results of calculations have been analyzed in comparison with experimental date in the IR range. It was shown that the magnitude and frequency dependencies of MRE are sensitive to the optical properties of the structures, model parameters, their thickness and MR values. It was shown that changes of the optical constants are strictly connected with the magnetoconductivity (magnetoresistance) of the nanostructures under applied magnetic field. So as MRE can be used as contactless method for MC measurements effectively. Keywords: magnetorefractive effect, nanostructures, magnetoresistance. |
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A.E. Yachmenev, |
GaAs PHEMT PERFORMANCE INCREASE USING DELTA-DOPING IN THE FORM OF NANOWIRES OF TIN ATOMS 14 AbstractThe PHEMT epitaxial structures with a doping profile in the form of tin nanowires were fabricated using vicinal GaAs substrate disoriented by 0.3° in relation to accurate orientation (100). Investigation of electron transport properties of the structures with nanowires of tin atoms on vicinal GaAs substrates have been presented. It was determined that non-optimal growth temperature of cap layers leads to degradation of electrophysical parameters of the samples and prevent forming of tin one-dimensional channels. Anisotropy of the saturation current on current–voltage characteristics was obtained when current flow along and across nanowires. Field effect transistors with special topology for orthogonal current flow were fabricated and frequency characteristics were measured. The evident anisotropy of the frequency characteristics for PHEMT was shown. Gain coefficient MSG (Maximum Stable Gain) of the fabricated PHEMT for current flow along nanowires correlates to best-achieved values of MSG for GaAs PHEMT. Keywords: PHEMT, tin, nanowires, anisotropy, current-voltage characteristic, field-effect transistor. |
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INFORMATION SYSTEM. INFORMATICS. PROBLEMS OF INFORMATION SECURITY |
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Sh.G. Magomedov |
ASSESSMENT OF THE IMPACT OF CONFOUNDING FACTORS IN THE PERFORMANCE INFORMATION SECURITY 29 AbstractThe paper considers the problem of improving the reliability of estimates of indicators providing information-without danger on the basis of constructing cognitive models related factors are associated with the process of formation and development of various types of information security threats. There are new types of assessments of safety performance to ensure a certain guaranteed level of the range of possible values of the index, which provides a more responsive and more accurate assessment of safety performance. Formed procedure for constructing cognitive models related factors, as well as evaluation of safety performance based on the cognitive model built. This procedure is demonstrated by a specific example. Problem analysis of the level of information security is an important component of the problem and ensure even improve the functioning of the object of protection. However, existing methods of assessing the safety level often rely on the use of expert methods for direct assessment of information security indicators that have relatively less complex objects and data systems makes it quite rough estimates due to the availability of a sufficiently large number of uncertain and random factors. Here to solve the problem of improvement of quality evaluation is proposed to clarify the process of formation of various types of threats on the basis of the construction of cognitive models describing the dependence of the considered threats to a variety of factors that can have a significant effect on the consideration of information without the threat-risk. Keywords: information security, cognitive model, related factors, guaranteed, extreme and average estimates of indicators, assessment of the degree of influence of factors on the threat. |
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ANALYTICAL INSTRUMENTATION AND TECHNOLOGY |
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A.A. Sandulyak, |
Abstract The paper observes matter about identification of operating area at Faraday balance (area for positioning of test specimens with a small volume). This matter is given coverage to reference deficiently and it’s necessary to evaluate magnetic susceptibility values of specimens – based on purpose obtained coordinate characteristics of magnetic field induction between pole pieces of such balance. The paper shows that such identification may be quite effective when given characteristic (usually it is non-linear and doesn’t yield to desired linear even local approximation) is curly, i.e. has an inflection. It may possible making a linear approximation of rather shortly characteristic’s response region, i.e. establish a stable value induction gradient (according to accepted criterion sample poisoning). It also may possible getting visualized extremum view of gradient induction characteristic (in the vicinity of its gradient value are relatively stable). Keywords: Faraday balance, magnetic susceptibility, specimen’s positioning area, field density (induction) characteristic, gradient extremum. |
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ECONOMY OF THE KNOWLEDGE-INTENSIVE AND HI-TECH ENTERPRISES AND PRODUCTIONS |
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P.P. Labzunov |
THE METHODOLOGY OF COST MANAGEMENT IN THE MODERN SOCIETY 26 AbstractThe transformation of the market economy in the conditions of information society causes the necessity of development of cost management contemporary methodology. The formation of an effective system is possible only on the basis adapted to the innovative development of the principles and methods of management. These basic elements of the methodology need to be clarified. In connection with the transition to the market relations in the Russian economy the radical changes occurred: the form of property and owners changed in the majority of economic subjects; the whole system of productive-public relations was transformed; passage from planning and directive management to the competition methods and the self-regulation on a scale of the national economy occurred. At the same time scientific base of cost management, which industry enterprises use, both domestic and borrowed from the western scientific schools of management, is out-moded. The top-down administrative system for industrial enterprises' activity and cost management, which functioned in the USSR, is destroyed even in the 90's of past century, and industrial enterprises, large companies preserved only the separate elements of cost management system, they mainly use the methods of limitation and expenditures control, while the integrated system for expenditures management is necessary. The need for organising the comprehensive system for cost management requires renovation and development of methodological base. Contemporary society is increasingly more frequently defined as information-based, so this circumstance gives new quality both to production and to management, increases management capabilities everywhere and by the enterprises' economic activity in particular. But one must take into account, that the improvement of scientific base and management practice doesn't occur simultaneously, but represents the complex process of formatting, approbation and management system organizing, is exercised gradually. Substantial changes in the conditions and the nature of production, administrative processes determine the need of tasks' refining, continuous renovation and improvement of the methodological base of cost management. Keywords: methodology, management principles, cost management, methods of management, enterprises, industry. |
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