This paper considers basic element of device of energy storage which is a piezoelectric generator (PEG) of cylindrical form with the attached inertial mass. A finite element modeling of the device operation is carried out during active load in the external circuit. The main purpose of the operation is to compare the output potential and frequency characteristics of the device known in the literature models of systems with concentrated parameters. On the basis of these models, we can receive the analytical dependence of parameters of PEG with its geometric characteristics and mechanical properties of the used materials. However, the question of the range of applicability of these formulas is still open. In this paper, based on the numerical analysis of finite element models of PEG in package ANSYS, we obtained comparison with the analytical formulas that show the values of some parameters of simplified models and set the boundaries of their applicability.

Keywords: energy storage, PEG, piezoceramics, effective mass, resonant frequency, FEM

The method of coding of the geometrical information is offered at the task of executive mechanisms on the basis of use of the set set of spatial primitive things and their orientation in mobile systems of co-ordinates. The method of a designation of geometrical models of mechanisms of robots is offered. One of advantages of the developed method of representation of geometrical models of kinematic chains, possibility of more exact task of a spatial configuration of manipulators by means of use of a considerable quantity of central points and various position of volume primitive things concerning a constructive plane is.

Keywords: Mechanisms of manipulators, geometrical models, virtual modelling of movements of robots

The atomic structure of bimetallic nanoparticles of Pt-Ag composition, which are the part of metal-carbon electro-catalysts PtAg/C, is studied by means of EXAFS spectroscopy using the suggested technique. These materials have been prepared by methods of consistent and simultaneous deposition of Ag and Pt atoms from aqueous ethylene glycol solutions of their salts with subsequent acid treatment. The values ​​of the structural parameters of the near environment of platinum atoms are determined. The nature of the distribution of components in nanoparticles is established. Cluster models of nanoparticles are constructed. The fraction of Pt atoms in the working shell and its dependance on preparation methods in each case are determined.

Keywords: Metal-carbon electrocatalysts, bimetallic nanoparticles, Catalysis, Platinum, X-ray absorption spectroscopy, atomic structure

To date, questions the reliability and continuity of electrical energy production facilities are among the most urgent , due to the transition generation companies into private hands and aggravate financial, economic and industrial- technological challenges : depreciation and obsolescence of equipment, lack of investment and other factors, influencing the power producers .
The article discusses the various valuation techniques of industrial enterprises and industrial complexes electricity . On the basis of their proposed universal method of estimating production complexes electricity , which is divided into 6 groups and includes weights . The article noted that the proposed method of estimating the weight of electric power systems operation has several advantages compared with the methods of other authors.

Keywords: electricity, electricity production complexes, investment, reliability, development

The article is devoted to modelling of process of decision-making in difficult systems in the conditions of total uncertainty. The problem is formulated on the basis of synthesis of concepts of the control theory and decision-making, the theory of fuzzy sets and the fuzzy logic, the theory of hierarchical multilevel systems, the utility theory and the theory of games. The given concept expands possibilities of the account uncertainty the various nature, typical to mathematical description of the surrounding validity. Problems of search of decisions in an fuzzy hierarchical control system are designated. The way of the description and finding of alternative decisions in multilevel difficult systems is offered in given article. The algorithm is based on information processing in the form of fuzzy intervals taking into account two kinds the politician conservative and aggressive on the basis of criteria «maxmin» and «minmax». The method of projection on individual interval is used for comparison of the fuzzy intervals presented on various dimension scales. The example showing work of algorithm of a choice of two groups of alternatives is resulted: optimistic and pessimistic on a level of hierarchies of the purposes in the conditions of total uncertainty.

Keywords: Difficult system; decision making, fuzzy interval, the control decision; total uncertainty

This paper proposes criteria for the optimal choice of a database management system (DBMS), based on the requirements to this system. Empirically assessed criteria and method of analytic hierarchy process for decision making were used to carry out the comparative analysis of several DBMSs, implementing relation data model and having similar functionalities. The obtained matrixes of pair-wise comparison are examined for concurrence by calculating indices described in the article. As a result, the database management system for the own project is rationally chosen.

Keywords: DBMS, method of analytic hierarchy process, criteria, matrixes of pair-wise

The article shows the necessity of the research effort results state registration in the form of intellectual property objects – databases and software products. The Petrozavodsk State University’s experience in this field is shown

Keywords: Database, intellectual property, software products, intellectual activity result

This paper offers an improvement for machine vision based tracking algorithm using NARX neural network. This is achieved by predicting the next position of a mobile agent based on previous movement described by time-series functions. The algorithm remains passive and does not interfere with the quadrotr flight path until detection of multiple agent-candidates, when the tracking algorithm is not able to identify or locate the assigned agent. Meanwhile the NARX training set are updated in parallel with each successful tracking cycle. This process is done to eliminate the overfitting problem of BPTT training.

Keywords: NARX, quadrotor, agent tracking, local minimum problem, machine vision

Application features of dynamic memory devices based on binary fiber-optic structures are researched in optimal filters of sequence of pulse signals.
The possibility of significant improvement of signal-to-noise ratio in optimal filters of sequence of pulse signals using non-recirculating binary structures compared to recirculators is proved.
Application of the technical solution based on the method of enhancing identity copies in binary fiber-optic structures allows to achieves the gain in signal-to-noise ratio of about 37 dB for 4096 copies processed, this corresponds to the gain of 22 dB compared to typical recirculator.

Keywords: binary fiber-optic structure, optimal filter, pulse sequence, signal-to-noise ratio

The paper studies the possibility of interaction of acrylamide with aliphatic di-, tri-, tetra- and pentaamines using quantum chemical ab initio modeling. The interest to the preparation of these compounds can only increase since they may serve as feedstock for the production of other useful materials which may find adequate application. The choice of reaction conditions depends on the thermodynamic principles of the process, and for that reason, the paper determines thermodynamic parameters and the logarithms of the equilibrium constants of acrylamide reaction with aliphatic amines in ratio of 1:1 and 2:1 in the gas phase by quantum-chemical method based on density functional theory using a hybrid exchange-correlation of B3LYP functions in the basis of 3 -21G* within 273 ÷ 450 K temperature range and pressure of 0.1 MPa. These calculations served as a base for defining the conditions that must be followed when developing the technology for these compounds, and it was shown that the reaction of their synthesis with high probability of acrylamide - amine reactants ratio of 2:1 should be conducted under relatively mild conditions. Theoretical calculations comply with the experiment, because the interaction of acrylamide with amines at various ratios of reagents and temperatures within 325 ÷ 330 K leads predominantly to the transformation at acrylamide-amine 2:1 reagent ratio, as evidenced by the number of reactive reagents, and frequency analysis of FT-IR, NMR 1H and 13C spectra.  Thus, the possibilities of mathematical modeling allow determining the highest probability of spontaneity for a particular reaction, using the method of computer simulation by changing the process temperature (within the model) without performing any technological experiments.
       

Keywords: Acrylamide, aliphatic amines, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepenta-amine, thermodynamic parameters, Gibbs free energy, isobaric-isothermal potential, equilibrium constant.

On the basis of the conducted questionnaire survey of the inhabitants of the Kirov region identified determinants of consumption individuals of cultivated mushrooms. Built a factor model of the market of cultivated mushrooms Kirov region

Keywords: Market of cultivated mushrooms, discriminant analysis, factor analysis

A model is presented for the calculation of thermoelastic stress and displacement  in semiconductor structures
due to laser processing. Developed software based on the model allows to determine the optimal parameters of laser processing with taking into account the physical and topological parameters of the structure. The model is divided into two tasks: the non-stationary heat  conduction equation is solved, and the equilibrium equations and Hooke's law. For equations solution was used the finite difference method.

Keywords: Laser processing, thermal stress, finite difference method

The main issues of competitiveness, assess the quality of services, pricing strategy, especially sales service, new services, cost accounting and auditing in the tourist and recreation industry

Keywords: competitiveness, quality of services, audit, pricing strategy, marketing, tourist and recreational industry.

According to the signal theory vocal speech presents a non-stationary random process due to time variation of its main characteristics. A special emotional impact is gained during ensemble and choir performances. The article provides the correlation analysis results and the autocorrelation function of ensemble singing calculated, taking into account the non-stationary nature of acoustic signals. The studies have shown that there is a certain visual resemblance between correlation portraits of a non-professional student ensemble and a non-professional solo singer. At the same time the correlation portrait of student and professional co-performance tends to a professional singer correlation portrait. This helps to make a quantitative assessment of an ensemble’s professionalism which, alongside with a vocal teacher’s subjective assessment, can provide an objective view on singers’ voices condition to optimize the academic voice training process in an ensemble, which is important when using this voice assessing method in music schools, colleges and universities.

Keywords: Vocal speech, acoustic signal, ensemble singing, choir performance, non-stationary random process, autocorrelation function, quantitative assessment

Nonstoichiometric tungsten oxides WO3–x and oxide alkaline tungsten bronzes have been studied because of their potential applications in electrochromic devices such as solar panel arrays and “smart windows”. Different phases of 
WO3–x have been considered. In this part we present results of our research which clearly show that all Magneli phases of tungsten oxides  WOx (namely W40O118, W20O58, W5O14, W18O49, W8O23, W3O8) and oxide tungsten bronzes MxMyWO3 at M-Li, Na, K, Rb, Cs. They are characterized by metal – like properties. Their band structures display an energy gap in the valence band just below the Fermi level.
We present results of our electrochemical synthesis of tungsten oxide bronzes in ionic melts of the polytungsten salts. Among the new state – of – the art methods for their manufacture, electrochemical synthesis in ionic melts, which  makes considerably better use of existing technologies, is highly productive, based on the discharge of oxyanions of the polytungstates.  

Keywords: oxide alkali bronzes, alkaline tungsten bronzes, tungsten, molybdenum, nonstoichiometry, tungsten oxides, electroconductivity, electrochromism