A method for analyzing generalized characteristics of the South Asia Low structure taking into account a thermal regime of underlying surface

The South Asia Low is considered, that is a seasonal center of atmospheric action, a predominant type of circulation in the lower troposphere during the warm season over the Near and Middle East. The generalized factorial model of the low for the levels of 1000, 925, and 850 hPa is presented. The dependence of generalized characteristics of the low structure on surface air temperature in the summer months is estimated for different types of the low. The results of the present study extend information about the seasonal center of atmospheric action: they allow obtaining typical fields of the low taking into account the features of internal structure; revealing peculiarities of meteorological conditions for different types of the low (in different parts of the analyzed macroregion). The identified generalized characteristics of the low structure can be used for constructing forecast models. Keywords: South Asia Low, geopotential height, reanalysis, isobaric level, factor, cluster, correlation coefficient

Efficiency of wave energy conversion into electric power: calculation results

Object and purpose of research. The object of the study is the wave energy converters (WEC) into electric power. The purpose of the study is to draw up a differential equation describing the operation of the WEC, its solution and determination for the design parameters influence of the WEC on the efficiency of energy conversion. Materials and methods. The theoretical methods adopted in ship mechanics and theory are used to study the operation of complex mechanisms and dynamics of marine objects. The data on the characteristics of electric generators are used. Main results. The differential equation describing the operation of the WEC on regular wave is compiled. The equation relates the characteristics of waves to the design parameters of the WEC. Generalized characteristics of electric generators are obtained. Systematic calculations are carried out; they show the influence of the WEC design parameters on the efficiency of wave energy conversion into electric power. Conclusion. The results can be used in design of the WEC. The resulting differential equation makes it possible to investigate the operation of the WEC in various marine conditions and to evaluate the influence of design parameters on the efficiency of energy conversion. The generalized characteristics of electric generators can be used in design of wave power structures and wind power plants.

Сontent aspects of a modern St. Petersburg city tour

Excursion activities in large cities of Russia demonstrate the increasing popularity of city tours and are undergoing numerous transformations, expressed both in thematic diversity and in the change in the content of individual excursions. This has an impact not only on the perception of urban space by sightseers – citizens and visitors, but also on the socio-cultural processes of the city and society in a broader sense. The article presents the results of an empirical study (included observation) of the content specificity of a number of city excursions around St. Petersburg as a city with the most actively developing excursion sphere. The content is analyzed in terms of: route and display objects; narrative and communication of the guide with the audience; activity activity, reflecting the solution of communicative tasks; the competence of the guide. The observation results are correlated with the provisions of scientific and methodological literature (authors of the early Soviet period – I. M. Grevs, N. P. Antsiferov, B. E. Raikov, N. A. Geinick, the era of «developed socialism» – B. V. Emelyanova , modern researchers – O. N. Orlova, A. G. Smirnova, I. I. Lisaevich, G. A. Leskova, N. A. Dobrina) and are presented in the form of generalized characteristics of the transformation of excursion content based on the phenomenological characteristics of the typology and content of a modern city excursion.

MATHEMATICAL MODEL OF FUZZY MULTIPARAMETRIC ASSESSMENT OF COMPETENCIES

The article describes one of the possible models of fuzzy multiparametric assessment of students' competencies. The mathematical apparatus of the model is described, taking into account the requirements of fuzzy logic. The concept of competence indicators as generalized characteristics of competencies and as learning outcomes is specified; their comparability with labor functions and (or) labor actions and with the set of KS (Knowledge skills) is taken into account. This model is considered in the synthesis of the "discipline" - "project" categories in the education system.

Generalized characteristics of expanded sector beams formed by phased antenna arrays obtained by scaling phase distributions

This paper considers specific features of the phase synthesis of expanded sector beams formed by phased antenna arrays by the method of fan partial diagrams. Partial radiation patterns are formed by pairs of adjacent emitters. The synthesis results have the property of scaling, which allows many expansion options to be obtained on the basis of one expansion option. This is achieved by multiplying the phase shift values of the signals from all emitters by the same value. It is shown that, when the beam expands along the sum channel, a radiation pattern with an extended angular distance between the maxima is formed in the difference channel. An analysis of the initial sections of the difference radiation patterns in the formation of expanded beams of the sum radiation pattern was conducted. The behaviour of the generalized characteristics of expanded beams across the range of expansion coefficients was analysed. The conclusion was made about the possibility of timely and predictable control of the width of the difference radiation pattern of a phased antenna array

A Study of a Darrieus Vertical Axis Wind Turbine with a guiding nozzle

This paper presents the results from an experimental study of a Vertical Axis Wind turbine model with a guiding nozzle. The geometry of the nozzle is synthesized by an original methodology. The performance characteristics of the turbine are investigated when changing the number of the blades and their pitch angle. The obtained results allow us to generate generalized characteristics that can be used in the design of new turbines of this type. The results of the pilot studies showing higher efficiency than the classical Darrieus wind turbines (up to 50 % which is close to the Betz limit).

On generalized characteristics of smoothness of functions and on average $\nu$-widths in the space $L_2(\mathbb{R})$

Estimates above and estimates below have been obtained for Kolmogorov, linear and Bernshtein average $\nu$-widths on the classes of functions $W^r (\omega^w, \Psi)$, where $r \in \mathbb{N}$, $\omega^w(f)$ is the generalized characteristic of smoothness of a function $f \in L_2(\mathbb{R})$, $\Psi$ is a majorant. Exact values of the enumerated extremal characteristics of approximation, following from the one condition on the majorant were obtained too.