Sergey Kramarov

Surgut State University · Department of Information Technology Science Center

The monograph is written by a team of authors and based on the results of "The possibilities of artificial intelligence in improving the information educational space of the regions of Russia" thematic platform’s work within the XX All-Russian Conference and the XXX All-Russian school and seminar "Integration of Russian universities into the world...

The monograph deals with the problems of analysis and synthesis of electronic information and learning environment as an ergatic system. The issues of creation, development and evaluation of such systems, as well as information support of the process of building and using artificial intelligence, including in the protection of information, are cons...

Among the many ways of representing and processing space information, polygonal ones are not so often found, although polygons, as geometric means of describing spatial information objects, are very common in wide internet content. In computer games, design, even in fine art and many other applications, the polygonal description of such objects is...

Decarbonization issues are one of the main strategic directions of modern environmental development today. New technologies of agricultural use of soils are used to fix carbon in the soil in the form of humus, which ultimately helps to reduce the greenhouse effect and actively affects the amount of carbon entering the atmosphere. The use of open da...

We consider the problems of clustering and segmentation for objects in the geoinformation space using the cellular automata theory, both classical and non-orthogonal ones. We clarify the terminology associated with the use of hybrid software and hardware for processing information coming from sources of different physical nature. This research is b...

The monograph was prepared following the results of the XIX All-Russian Conference and the XXIX All-Russian school-seminar "Integration of Russian universities into the world educational and scientific space, taking into account regional peculiarities" and a regional scientific and practical conference "National interests and issues of regional dev...

Formation method of a lattice based on the fuzzy Delaunay triangulation by grinding a rough triangular grid using multiple half-division of the sides of the original triangles is considered in the article. This approach to shredding allows you to build regular grids and corresponding triangulations of these midpoints, consisting of both equilateral...

Abstract. The article suggests using a new approach to formalize requirements and describe them in the form of a fuzzy area in the settings space. To do this, an alphabet is made that contains the values of linguistic variables. Using this method, it is possible to quantify the extent to which the proposed system is part of a variety of effective A...

The article discusses theory of satellite image representation on non-rectangular lattice and feasibility of this approach. The background of the expediency and essentiality of hexagonal and triangular lattices in satellite image processing is presented. The information capacities of images are examined, and the advantages/disadvantages of nonortho...

The monograph is based on the results of the XVIII all-Russian conference and the XXVIII all-Russian school and seminar "Integration of Russian universities into the world educational and scientific space with taking into account regional characteristics" which were dedicated to the discussion of one of the most relevant topics which is reflects th...

This review article summarizes the material of years of research on the impact of mechanical stresses on the domain structure of multiaxhetoelectrics using the example of barium titanium monocrystals. Since the discovery of the ferroelectric properties of barium titanate in 1944, this material has been the subject of comprehensive investigation as...

The Earth remote sensing technologies (ERS) in exploration largely determine their effectiveness. Therefore, development of a new methodological support for the use of remote sensing data in predicting mining and geological conditions is a key priority area. The studies are based on the analysis of the assessment of information, social, and economi...

The paper considers and studies the methods of a complex approach to the formation of unite geo-informational space of territories on the basis of a digital plan-scheme as an elementary semantic object of the image of the underlying surface, the choice of approaches to the use for this purpose of intellectual analysis of fuzzy data stored in virtua...

The approach to the formation of a multidimensional digital model of the learning environment using the mathematical unit of differential equations of the first order, implemented on the system of systems principle is considered. It is shown that within the framework of digitalization of the main components of this environment, bifurcation analysis...

The estimation of the state of dynamic stochastic systems using the methods of filtration theory assumes the exact a priori setting of the parameters of the equation of the system and the probabilistic characteristics of its noises, which in practice are known approximately or change in time randomly. In this regard, the algorithm of adaptive estim...

It has been proposed to use a new analogue of the Leontiev model of interindustry balance as a mathematical apparatus for studying the influence of clustering on the financial and economic state of enterprises (organizations). For the basic concept used for the mathematical formalization of the problem, the economic potentials of enterprises, calcu...

The article presents and tested a new technique that allows performing financial and economic analysis of enterprises in a given industry in order to optimize its management, based on open internet data sources, using licensed software, as well as on the basis of classical methods of intellectual data mining (further - IDM), as well as systems of f...

At present, ferroelectric, piezoelectric ceramics is the main material that is used as the active elements of ultrasonic, electroacoustic, measuring, and a number of other engineering fields. An analysis of the trends in the development of piezotechnics shows a number of features: first, the consumption of ferroelectric ceramics increases; secondly...

The monograph was prepared following the results of the XVII All-Russian Conference and XXVII All-Russian School-Seminar "Integration of Russian Universities in the World Educational and Scientific Space, taking into account regional features", devoted to the discussion of one of the most topical issues that reflect the modern perspectives and chal...

The monograph was prepared following the results of the XVII All-Russian Conference and XXVII All-Russian School-Seminar "Integration of Russian Universities in the World Educational and Scientific Space, taking into account regional features", devoted to the discussion of one of the most topical issues that reflect the modern perspectives and chal...

This paper explores the state assessment and management of complex human-machine systems that ensure that results are quickly obtained with the desired accuracy. The problem is solved by monitoring the real parameters of the process and comparing them with the results of the simulation, taking into account their fuzziness, incompleteness and lack o...

There is the current state of a question of creation of the indistinct and logical optical devices serving for development of high performance expert systems which will provide inquiries of experts from the most various areas is considered in the monograph. Use of the device of indistinct systems is caused by a tendency of increase in complexity of...

The monograph is based on the results of the XVI all-Russian conference and the XXVI all-Russian school-seminar "Integration of Russian universities into the world educational and scientific space taking into account regional peculiarities", devoted to the discussion of one of the most relevant topics of the modern education system: international c...

The proposed method of management of complex system based on soft computing, which includes newly developed mathematical tools of fuzzy analog controllers. Model of analog controllers based on the previously proposed apparatus of the multi-level fuzzy classifiers to assess the state of the system based on the integration of complex heterogeneous in...

Presents hybrid-fuzzy model of assessment of dynamics of a complex object (plant, industry, manufacturing complex) based on the analysis of a set of heterogeneous indicators of its condition. Ranking of dynamics of each of the parameters separately allows you to identify problem subsystem object, requiring adjustment of management.

The possibility of synthesis of functional elements of elastic fuzzy logic processors based on opto-electronic and integrated optical technologies, providing the realization of operators of fuzzy logic in real time and with high precision is considered in the paper. The possibility of using of mentioned technologies for elastic fuzzy logic computin...

The questions of the formation of uniform geo-information space on the principles of geo-interoperability are considered. The sources and tools of receiving the original data are chosen. The evaluation of the applicability of research results is provided in favour of geodesy, geology, agriculture, transport, etc. The components of the mechanism of...

There are questions of management of the composite dynamic systems in the conditions of indeterminacy, including consideration of systems for an intellectual adaptive control, questions of assessment of a condition of the concentrated and distributed stochastic systems by various criteria are considered; questions of stochastic management of dynami...

It is solved a problem of a posteriori estimation of dynamically modified parameters of angular movement of the object by satellite measurements. There are shown advantages of application of the methods of stochastic non-linear dynamic filtration before single-stage measurements. It is represented an example, showing efficiency of proposed approach...

The anomalous photoferromechanical effect and negative photoconductivity are reported for BaTiO3:Gd3+ crystal. The ultraviolet illumination, for the first minute, reduces the crack size formed by charged walls of the ferroelectric domains, but with longer illumination, the effect was contrary. We show that this anomalous behaviour is caused by the...

Dispersity of the initial niobium pentoxide powder used in the synthesis of niobate ceramics significantly affects the mechanical properties of these ferroelectric materials. The best mechanical properties were observed in the samples of niobate ceramics characterized by a minimum deformation of the unit cells, corresponding to certain intervals of...

The presence of fluorine impurity in alkali metal niobate ceramics sharply deteriorates both mechanical and electrical properties of these ferroelectric materials. This effect is related to the separation of a glassy phase and the formation of an inhomogeneous microstructure, these factors giving rise to local stresses in the structural elements. I...

The simple model of molding at a constant temperature is presented for the first time. Process of molding is considered as a sequence of phase transitions between different macroscopically defined states (phases): granulated powder, dispersed crystalline state and polycrystalline state. The theory predicts that intermediate states must be considere...

The conception of special thermal stresses in ferroelectrics ceramics based on the existence of conglomerates of grains is presented.

A concept of geometrical phase transitions is proposed to describe the molding of samples of polycrystalline ferroelectrics. Percolational computer models have been worked out enabling one to predict the degree of technological stability of ceramics production. Some results are given concerning the technology of obtaining samples of lead ferronioba...

Algorithms have been obtained to isolate clusters and determine percolation in irregular heterogeneous structures. These algorithms are quite useful for the solution of problems concerned with the formation of microstructure of ferroceramics in the process of its manufacturing. The computer simulation has indicated that the microstructure of ferroc...

A simulation model, including stochastic packing, selection and clusterization is applied to the problem of sintering of polycrystalline ferroelectrics.

Experimental results confirming the percolation model suggested by the authors earlier are described.

A percolation model of ferroceramic microstructure formation is exposed based on the supposition the said process to be a succession of a number of phase transitions. The model enables to describe the processes taking place on all technological stages of ferroceramic microstructure formation.

The possibility of the existence of an internal 90[ddot] domain within c-domain BaTiO3 crystals is theoretically substantiated. This domain originates in the bulk of the crystal and may never reach any of its surfaces. Experimental and theoretical studies are reported aimed at determining the dependence of properties of such a-domain on the mechani...

The model of sintering processes occurring in ferroceramic materials as percolation phase transition are suggested. The results of a computer simulation of sintering processes based on percolation models are presented.

Three types of the photomechanical effects have been studied in BaTiO3 and PbTiO3 like crystals subjected to local mechanical stresses, namely, the photodomain effect, photomechanical effect and photo-mechanic-ferroelectric effect. All the effects studied are rooted in the interaction of the released current photocarriers with various microstructur...

In the local deformation of the c-domain BaTiO3 crystal an “internal” 90° domain is formed in its bulk which does not reach any of the crystal surfaces. Conditions for its formation, its geometry and growth dynamics have been investigated. The effects of the monodomainization, “ageing” after “molding” by an electric field, Gd impurity and photoacti...

Changes have been studied in the plastic and strength properties of the BaTiO3 and PbTiO3 crystals under photoactive UV illumination.

Experimental results have been analyzed on studies of elastoplastic deformation and fracture that occur in ferroelectric crystals of the BaTiO3, type indented by the Vickers pyramid.

Exact solutions have been obtained in terms of a model of the thermoelectroelastic medium characterized by one-dimensional nonuniformity of its physical properties for principal effective piezoelectric, dielectric, elastic and pyroelectric constants of a multilayer structure of the piezoceramics/metal type. A case is discussed of the ceramic poled...

The influence of cyclic loading on the domain sructure of ferroelectric ceramic of the TsTS system was investigated by methods of transmission electron microscopy. It was observed that high-frequency cyclic deformation leads to partial depolarization of the material. This is most clearly expressed at points of application of the maximum mechanical...

A previously unknown physical effect is described of UV irradiation impeding the growth of the cracks that originate, upon indentation, in an a-single-domain BaTiO3 crystal.

Quite a few authors have discussed the effect of residual (internal) mechanic stresses on strength properties of polycrystalline ferroelectrics (see, e.g., Reference 1–4), however, by far not all the aspects of this problem have been elucidated as yet. In these processes, the role of the microstructure (grains, pores, glass phase, domains,etc.) is...

A geometrical approximation of the transversely isotropic piezocomposite is proposed in the form of a model of coaxial cylinders made up of a binding material and cylindrical inclusions randomly distributed in the isotropy plane. A solution to the electroelastic problem of equilibrium of the coaxial cylinder in an effective medium has made it possi...

Results of this study show that the different contributions to the effective properties of ferroelectric ceramics of the boundaries type I and II make it possible to objectively control these parameters. Thus by changing the temperature gradient at the heating stage during gradient sintering of such materials it is possible to change, in a marked d...

A very important factor in the dynamics of the formation of microstructure in the piezoceramic (PC) is clustering of grains during sintering which produces grain conglomerates (GC) and creates intergranular boundaries of two types, namely, the boundary between grains within a GC (I type) and those between the GC's (II type). The GC formation has be...

method to perform calculations for a two-phase PCM with its symmetry axis perpendicular to the plane of the interface between the layers for the most part substantiated the statistical theory in [4] (only X* l, X*3, X't, e*31 did not coincide with the exact results obtained in [3]). Making the requirements in regard to the accuracy of the predictio...

Temperature dependences of fracture toughness of some ferroelectric crystals have been studied both experimentally and theoretically. It is argued that its anomalous behavior in the phase transition region may be related to the presence of the piezoeffect in the ferrophase.

A method is presented for calculating the electrophysical parameters of composite materials with two-phase lamellar piezoelectric texture. The calculation is based on the hypothesis of equivalent homogeneity and is, in essence, related to the method of individually homogeneous fields. Anomalies of some constants of piezotexture are observed at vari...

A method is suggested for estimating the contribution of domain reorientations to the energy failure of ferroelectric. The method is based on the theory of mechanical stress relaxation. An expression is obtained for the value of energy wasted on the domain reorientation for the case of a small crack in an infinite body to which a tensile force is a...

Strength properties and microstructure of three types of composites with piezoceramic matrix have been studied. As fillers dispersed particles, glass and a polymer were used. All these composites exhibit better strength properties, mechanisms of fracture are, however, different in all these materials.

Ferroelectric ceramics are widely used in electronics, measuring instruments etc which raises requirements for their stability to sharp temperature fluctuations (thermal shocks). The thermal shock is widely used during the polarization of the ferrohard materials. However, the arising machanical stresses often lead to the microcracking and, as a res...

On the basis of dislocation models, various theoretical fracture models are suggested. Fracture processes both at the stage of the generation of microcracks and their subsequent growth have been studied. Experimental observations on BaTiO3 and PbTiO3 single crystals are the basis for the constructed models.

An interection effect between a developing crack and the 90° domain boundary has been experimentally found in mono- and poly-cristalline ferroelectrios. To desoribe the observed effects the folloning theoretioal models are proposed:

Strength characteristics of ferroelectric ceramics possessing various internal biasing field values have been studied and the relation between mechanical strength and the ferroelectric state of the material has been determined. Anisotropy of the polarized ferroelectric ceramics mechanical strength has been studied. The effect on the strength of dif...