dc.contributor.author

value: Fominyh, Аlexander V.

dc.identifier.citation

value: Fominyh А. V. Method for finding a solution to a linear nonstationary interval ОDЕ system. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 148-165.

dc.description.abstract

value: The article analyses a linear nonstationary interval system of ordinary differential equations so that the elements of the matrix of the system are the intervals with the known lower and upper bounds. The system is defined on the known finite time interval. It is required to construct a trajectory, which brings this system from the given initial position to the given final state. The original problem is reduced to finding a solution of the differential inclusion of a special form with the fixed right endpoint. With the help of support functions, this problem is reduced to minimizing a functional in the space of piecewise continuous functions. Under a natural additional assumption, this functional is Gateaux differentiable. For the functional, Gateaux gradient is found, necessary and sufficient conditions for the minimum are obtained. Оn the basis of these conditions, the method of the steepest descent is applied to the original problem. Some examples illustrate the constructed algorithm realization.

dc.description.sponsorship

value: The main results of this paper (Sections 3 and 5) were obtained in IPME RAS and supported by Russian Science Foundation (project N 20-71-10032).

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Applied Mathematics. Computer Science. Control Processes;Volume 17; Issue 2

dc.subject

value: differential inclusion

value: support function

value: the steepest descent method


dc.contributor.author

value: Egorov, Nickolay V.

value: Vinogradova, Ekaterina M.

dc.identifier.citation

value: Еgorov N. V., Vinogradova Е. M. Mathematical modeling of triode system on the basis of field emitter with ellipsoid shape. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 131-136.

dc.description.abstract

value: In this paper the mathematical modeling of the triode emission axially symmetric system on the basis of field emitter is considered. Emitter is an ellipsoid of revolution, anode is a confocal ellipsoidal surface of revolution. Modulator is a part of the ellipsoidal surface of revolution, confocal with the cathode and anode surfaces. The boundary-value problem for the Laplace's equation in the prolate spheroidal coordinates with the boundary conditions of the first kind is solved. The variable separation method is applied to calculate the axisymmetrical electrostatic potential distribution. The potential distribution is represented as the Legendre functions expansion. The expansion coefficients are the solution of the system of linear equations. All geometrical dimensions of the system are the parameters of the problem.

dc.description.sponsorship

value: This work was supported by the Russian Foundation for Basic Research (project N 20-07-01086).

dc.language.iso

value: en

value: micro- and nanoelectronics

value: field emitter

value: field emission

value: mathematical modeling

value: electrostatic potential

value: boundary-value problem

value: Legendre functions

dc.type

value: Article

format: Adobe PDF


dc.contributor.author

value: Morozov, Nikita F.

value: Indeitsev, Dmitriy A.

value: Igumnova, Vasilisa S.

value: Lukin, Alexei V.

value: Popov, Ivan A.

value: Shtukin, Lev V.

dc.identifier.citation

value: Morozov N. I., Indeitsev D.A., Igumnova V. S., Lukin A.V., Popov I.A., Shtukin L.V. Nonlinear dynamics of mode-localized MEMS accelerometer with two electrostatically coupled microbeam sensing elements. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 233–246.

dc.description.abstract

value:
In the presented work, a model of a microelectromechanical accelerometer with two movable
beam elements located between two fixed electrodes is proposed. The action of the transfer
forces of inertia in the longitudinal direction leads to a change in the spectral properties of
the system, which is a useful output signal of the sensor. The dynamics of the system in the
presence of a weak electrostatic coupling between the sensitive elements is characterized by
the phenomenon of modal localization   a significant change in the amplitude ratios for the
forms of inphase and antiphase oscillations with small changes in the measured component
of the acceleration vector of the moving object. Diagrams of equilibrium positions are
plotted for varying the potential difference between a fixed electrode and a movable element
and between two movable elements. The dependences of the frequencies and the ratio of
the components of the eigenvectors on the magnitude of the inertial action are investigated.
It is shown that the sensitivity of a sensor based on modal localization can be orders of
magnitude higher than the sensitivity of known systems based on measuring the shift of
natural frequencies. A nonlinear dynamic model of an accelerometer with external harmonic
electrostatic excitation of oscillations is constructed. Resonance characteristics are obtained,
a comparison is made between the model describing the modal characteristics of the system
and the model describing the real dynamic mode of operation taking into account nonlinear
factors.

dc.description.sponsorship

value:
This work is supported by St. Petersburg University (project no. 51092930) and Russian Foundation
for Basic Research (project no. 18-01-00884-A).

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 8 (66); Issue 2

dc.subject

value: resonant accelerometer

value: weakly coupled system

value: modal localization

value: resonance curves


dc.contributor.author

value: Kholshevnikov, Konstantin V.

value: Milanov, Danila V.

value: Shchepalova, Anastasia S.

dc.identifier.citation

value: Kholshevnikov K.V., Milanov D.V., Shchepalova A. S. The space of Keplerian orbits and a family of its quotient spaces. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 359–369.

dc.description.abstract

value:
Distance functions on the set of Keplerian orbits play an important role in solving problems
of searching for parent bodies of meteoroid streams. A special kind of such functions are
distances in the quotient spaces of orbits. Three metrics of this type were developed earlier.
These metrics allow to disregard the longitude of ascending node or the argument of
pericenter or both. Here we introduce one more quotient space, where two orbits are considered
identical if they differ only in their longitudes of nodes and arguments of pericenters,
but have the same sum of these elements (the longitude of pericenter). The function ̺6 is
defined to calculate distance between two equivalence classes of orbits. The algorithm for
calculation of ̺6 value is provided along with a reference to the corresponding program,
written in C++ language. Unfortunately, ̺6 is not a full-fledged metric. We proved that
it satisfies first two axioms of metric space, but not the third one: the triangle inequality
does not hold, at least in the case of large eccentricities. However there are two important
particular cases when the triangle axiom is satisfied: one of three orbits is circular, longitudes
of pericenters of all three orbits coincide. Perhaps the inequality holds for all elliptic
orbits, but this is a matter of future research.

dc.description.sponsorship

value: This work is supported by Russian Science Foundation (grant no. 18-12-00050).

dc.subject

value: Keplerian orbit

value: metric

value: quotient space of metric space

value: distance between orbits

dc.title

value: Article


dc.contributor.author

value: Bauer, Svetlana M.

value: Voronkova, Eva B.

dc.identifier.citation

value: Bauer S.M., Voronkova E. B. On non-axisymmetric buckling modes of inhomogeneous circular plates. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 204–211

dc.description.abstract

value:
Unsymmetrical buckling of nonuniform circular plates with elastically restrained edge and
subjected to normal pressure is studied in this paper. The asymmetric part of the solution
is sought in terms of multiples of the harmonics of the angular coordinate. A numerical
method is employed to obtain the lowest load value at which waves in the circumferential
direction can appear. The effect of material heterogeneity and boundary on the buckling
load is examined. For a plate with elastically restrained edge, the buckling pressure and
mode number increase with a rise of spring stiffness. Increasing of the elasticity modulus
to the plate edge leads to increasing of the buckling pressure, but the mode number does
not change. If the translational flexibility coefficient is small, decreasing of the elasticity
modulus to the shell (plate) edge leads to sufficient lowering of the buckling pressure.

dc.description.sponsorship

value:
The work was carried out with the support of the Russian Foundation for Basic Research (grant
no. 19-01-00208) and using the equipment of the resource center of the St. Petersburg State University
Scientific Park “Observatory of Environmental Safety”.

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

dc.subject

value: circular plate

value: buckling

value: heterogeneity


dc.identifier.citation

value: In memoriam of Viktor Abramovich Zalgaller (1920–2020). Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 373–376.

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 8 (66); Issue 2


dc.identifier.citation

value: In memoriam of Sergey Konstantinovich Matveev (1938–2020). Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 377–378.


dc.contributor.author

value: Kamachkin, Аlexander M.

value: Рotaрov, Dmitriy K.

value: Yevstafyeva, Victoria V.

dc.identifier.citation

value: Кamachkin А. M., Рotapov D. К., Yevstafyeva V. V. Method for the transformation of complex automatic control systems to integrable form. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 196-212.

dc.description.abstract

value: The article considers a class of automatic control systems that is described by a multi- dimensional system of ordinary dil'erential equations. The right hand-side of the system additively contains a linear part and the product of a control matrix by a vector that is the sum of a control vector and an external perturbation vector. The control vector is defined by a nonlinear function dependent on the product of a feedback matrix by a vector of current coordinates. The authors solve the problem of constructing a matrix of a nonsingular transformation, which leads the matrix of the linear part of the system to the Jordan normal form or the first natural normal form. The variables included in this transformation allow us to vary the system settings, which are the parameters of both the control matrix and the feedback matrix, as well as to convert the system to an integrable form. Integrable form is understood as a form in which the system can be integrated in a final form or reduced to a set of subsystems of lower orders. Furthermore, the sum of the subsystem orders is equal to the order of the original system. In the article, particular attention is paid to cases when the matrix of the linear part has complex conjugate eigenvalues, including multiple ones.

value: Vestnik of St Petersburg University. Applied Mathematics. Computer Science. Control Processes;Volume 17; Issue 2

dc.subject

value: automatic control system

value: multidimensional nonlinear dynamic system

value: nonsingular transformation

value: Jordan's normal matrix form

value: first natural normal matrix form

value: a system's integrable form


dc.identifier.citation

value: In memoriam of Pyotr Evgenyevich Tovstik.Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 197–203.

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

dc.type

value: Article


dc.contributor.author

value: Baskov, Oleg V.

dc.identifier.citation

value: Baskov О. V. Union and meet of an infinite number of type-2 fuzzy sets. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 108-119.

dc.description.abstract

value: The article examines the infimum and supremum of an infinite number of fuzzy numbers. It is shown that familiar properties of these operations, which are valid for real numbers, may apply to fuzzy numbers only under certain conditions. А formula for computing the infimum and supremum of any set of fuzzy numbers is provided. Since the union and meet of type-2 fuzzy sets are defined via the infimum and supremum of fuzzy numbers, all the results obtained are applicable to these operations as well.

dc.description.sponsorship

value: The work is supported by Russian Foundation for Basic Research (project N 20-07-00298-a).

dc.language.iso

value: en

dc.subject

value: type-2 fuzzy sets

value: union

value: meet

value: fuzzy numbers

value: infimum

value: supremum


dc.contributor.author

value: Tregubov, Vladimir P.

value: Egorova, Nadezhda K.

dc.identifier.citation

value: Tregubov V. Р., Еgorova N. К. Investigation of the frequency properties of a standard linear body. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 166-17З.

dc.description.abstract

value: It is known that the Кelvin-Voigt model does not describe stress relaxation, which is observed along with elastic properties in many polymers and biomaterials. In this regard, the standard linear body model is used to describe the properties of these materials. Studies of its properties were mainly limited to the study of its reaction to an instantaneously applied load, as well as to the determination of the time and nature of stress relaxation. Аt the same time, the frequency properties of the standard linear body remained unexplored. In this regard, an analysis of its frequency properties was carried out, which made it possible to study its behavior under vibration exposure. Оn the basis of the equation of motion, the amplitude-frequency response (АFC) was constructed, and its peculiarity was revealed, which consists in the fact that an increase in the damping coefficient leads to a decrease in the maximum value of the АFC only to a certain value greater than one. А further increase in the damping coefficient leads to an increase in the maximum frequency response up to infinity at a frequency that should also be considered resonant. Thus, the frequency response of a standard linear body always has a maximum. The subsequent increase in the damping coefficient leads to the tendency of the maximum frequency response to zero at infinity.

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Applied Mathematics. Computer Science. Control Processes;Volume 17; Issue 2

dc.subject

value: standard linear body

value: frequency response

value: model parameters

value: uniqueness of parameter values


dc.identifier.citation

value: On the 80th anniversary of Leon Aganesovich Petrosyan. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 359–369.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 8 (66); Issue 2

value: Article


dc.contributor.author

value: Rather, Nisar Ahmad

value: Dar, Ishfaq

value: Iqbal, Aaqib

dc.identifier.citation

value: Rather N.A., Dar I., Iqbal A. On the regions containing all the zeros of polynomials and related analytic functions. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 331–337.

dc.description.abstract

value:
In this paper, by using standard techniques we shall obtain results with relaxed hypothesis
which give zero bounds for the larger class of polynomials. Our results not only generalizes
several well-known results but also provide better information about the location of zeros.
We also obtain a similar result for analytic functions. In addition to this, we show by
examples that our result gives better information on the zero bounds of polynomials than
some known results.

dc.language.iso

value: en

dc.publisher

value: St Petersburg State University

dc.subject

value: polynomials

value: zeros

value: complex domain


dc.contributor.author

value: Filippov, Sergei B.

dc.identifier.citation

value: Filippov S.B. Buckling of the cylindrical shell joint with annular plates under external pressure. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 282–294.

dc.description.abstract

value:
By means of an asymptotic method the buckling under the uniform external pressure of
the thin cylindrical shell supported by identical annular plates is analyzed. Boundary conditions
on an internal parallel of the shell joined to a thin plate are obtained. At the edges
of the shell the free support conditions are introduced. We seek the approximate solutions
of the eigenvalue problem as a sum of slowly varying functions and edge effect integrals.
On a parallel, where the plate joint with the shell, the main boundary conditions for the
formulation of an eigenvalue problem of zero approximation are obtained. This problem
describes also vibrations of a simply supported beam stiffened by springs. Its solution we
seek as linear combinations of Krylov’s functions. It is shown, that in zero approximation
it is possible to replace a narrow plate with a circular beam. At increase in width of a plate
stiffness of the corresponding spring tend to a constant. It occurs because of localization
plate deformations near to the internal edge of a plate. As an example the dimensionless
critical pressure for the case when the shell is supported by one plate is found. The replacement
of a narrow plate with a circular beam does not lead to appreciable change of the
critical pressure, however for a wide plate the beam model gives the overestimated value of
critical pressure.

dc.description.sponsorship

value: This work is supported by Russian Foundation for Basic Research (project no. 19-01-00208).

dc.subject

value: ring-stiffened cylindrical shell

value: buckling

value: annular plate

value: asymptotic method

value: eigenvalue problem


dc.contributor.author

value: Maksimov, Anatolii G.

value: Tulupyev, Aleksandr L.

dc.identifier.citation

value: Maksimov A.G., Tulupyev A. L. Algebraic Bayesian networks: Checking backbone connectivity. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 305–316.

dc.description.abstract

value:
The paper investigates the construction of a joint graph as a global structure of network
based on its primary structure, one of the problems arising in machine learning of bases of
knowledge patterns with uncertainty, presented in the form of algebraic Bayesian networks.
The aim of the research is to propose methods for solving the inverse problem. As the results,
algorithms for checking a graph for belonging to a family of joint graphs and a family
of minimal joint graphs are proposed, and estimates of their computational complexity are
made. An improved version for the special case and an improvement for the general case
on average are also proposed for the algorithm for checking membership in a family of joint
graphs. The problem of recognition of joint graphs has not been previously researched; issue
is being addressed for the first time as currently drafted. The theoretical significance lies in
the possibilities for applying the results in further researches of graph-theoretic invariants
in the global structures of algebraic Bayesian networks.

dc.description.sponsorship

value:
The work was performed on state assignment of St. Petersburg Federal Research Center of the
Russian Academy of Sciences (project no. 0073-2019-0003).

dc.language.iso

value: ru

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 8 (66); Issue 2

dc.subject

value: algebraic Bayesian networks

value: joint graph

value: minimal joint graph

value: algorithms

value: complexity of algorithms

dc.type

value: Article


dc.contributor.author

value: Mikhasev, Gennadi I.

dc.identifier.citation

value: Mikhasev G. I. Studying free hight-frequency vibrations of an inhomogeneous nanorod based on the nonlocal theory of elasticity. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 220–232.

dc.description.abstract

value:
Free high-frequency longitudinal vibrations of an inhomogeneous nanosized rod are studied
on the basis of the nonlocal theory of elasticity. The upper part of spectrum with the
wavelength comparable to the internal characteristic dimension of a nanorod is examined.
An equations in the integral form with the Helmholtz kernel, incorporating both local and
nonlocal phases, is used as the constitutive one. The original integro-differential equation is
reduced to the forth-order differential equation with variable coefficients, the pair of additional
boundary conditions being deduced. UsingWKB-method, a solution of the boundaryvalue
problem is constructed in the form of the superposition of a main solution and edge
effect integrals. As an alternative model, we consider the purely nonlocal (one-phase) differential
model which allows estimating the upper part of spectrum of eigen-frequencies. Considering the nanorod with a variable cross-section area, we revealed a fair convergence
of eigen-frequencies found in the framework of two models when the local fraction in the
two-phase model vanishes.

dc.publisher

value: St Petersburg State University

dc.subject

value: nanosized inhomogeneous rod

value: high-frequency vibrations

value: two-phase nonlocal theory of elasticity


dc.contributor.author

value: Pilyugin, Sergei Yu.

value: Sabirova, Daria Z.

dc.identifier.citation

value: Pilyugin S.Yu., Sabirova D. Z. Dynamics of one continual sociological model. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 317–330.

dc.description.abstract

value:
In this paper, we study a dynamical system modeling an iterative process of choice in a
group of agents between two possible results. The studied model is based on the principle
of bounded confidence introduced by Hegselmann and Krause. According to this principle, at each step of the process, any agent chaqnges his/her opinion being influenced by agents
with close opinions. The resulting dynamical system is nonlinear and discontinuous. The
principal novelty of the model studied in this paper is that we consider not a finite but an
infinite (continual) group of agents. Such an approach requires application of essentially
new methods of research. The structure of possible fixed points of the appearing dynamical
system is described, their stability is studied. It is shown that any trajectory tends to a
fixed point.

dc.subject

value: dynamical system

value: opinion dynamics

value: bounded confidence

value: fixed point

value: stability


dc.contributor.author

value: Vasiliev, Grigoriy P.

value: Smirnov, Andrey L.

dc.identifier.citation

value: Vasiliev G.P., Smirnov A.L. Natural frequencies of an inhomogeneous square thin plate. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 212–219.

dc.description.abstract

value:
Plates, which geometric and physical parameters slightly differ from constant and depend
only on the radial coordinate, are analyzed. For free vibration frequencies of a plate, which
thickness and/or Young’s modulus depend on the radial coordinate asymptotic formulas
are obtained by means of the perturbation method. As examples, free vibrations of a square
plate with parameters linearly or parabolically depend on the radial coordinate, are examined.
The double frequencies of square plates with similar edge support of all edges are of
special interest, since any variation of the thickness or stiffness causes some loss of symmetry
one may expect the split of double frequencies. The asymptotic formulas permit
to determine, which of two equal unperturbed frequencies corresponding to wave numbers
n and m increases faster with the small parameter. For a wide range of small parameter
values, the asymptotic results for the lower vibration frequencies well agree with the results
of finite element analysis with COMSOL Multiphysics 5.4.

dc.description.sponsorship

value:
This work is supported in part by Russian Foundation for Basic Research (grants no. 18-01-00832-a,
19-01-00208-a).

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 8 (66); Issue 2

dc.subject

value: free vibrations of plates

value: inhomogeneous circular plate

value: perturbation method

dc.title

value: Article


dc.contributor.author

value: Vasil’eva, Ekaterina V.

dc.identifier.citation

value: Vasil’eva E.V. Different types of stable periodic points of diffeomorphism of a plane with a homoclinic orbit. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 295–304.

dc.description.abstract

value:
A diffeomorphism of the plane into itself with a fixed hyperbolic point is considered; the
presence of a nontransverse homoclinic point is assumed. Stable and unstable manifolds
touch each other at a homoclinic point; there are various ways of touching a stable and
unstable manifold. In the works of Sh. Newhouse, L. P. Shilnikov and other authors, studied
diffeomorphisms of the plane with a nontranverse homoclinic point, under the assumption
that this point is a tangency point of finite order. It follows from the works of these authors
that an infinite set of stable periodic points can lie in a neighborhood of a homoclinic point;
the presence of such a set depends on the properties of the hyperbolic point. In this paper,
it is assumed that a homoclinic point is not a point at which the tangency of a stable and
unstable manifold is a tangency of finite order. Allocate a countable number of types of
periodic points lying in the vicinity of a homoclinic point; points belonging to the same
type are called n-pass (multi-pass), where n is a natural number. In the present paper,
it is shown that if the tangency is not a tangency of finite order, the neighborhood of a
nontransverse homolinic point can contain an infinite set of stable single-pass, double-pass,
or three-pass periodic points with characteristic exponents separated from zero.

dc.description.sponsorship

value: The work is supported by Russian Foundation for Basic Research (grant no. 19-01-00388).

dc.publisher

value: St Petersburg State University

dc.subject

value: diffeomorphism

value: nontransverse homoclinic point

value: characteristic exponents


dc.contributor.author

value: Iakushev, Viktor Р.

value: Bure, Vladimir M.

value: Mitrofanova, Olga А.

value: Mitrofanov, Evgenii Р.

dc.identifier.citation

value: Iakushev V. Р., Bure V. M., Mitrofanova О. А., Mitrofanov Е. Р. Theoretical foundations of probabilistic and statistical forecasting of agrometeorological risks. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 174-182.

dc.description.abstract

value: Еach model for forecasting agrometeorological risks based on the analysis of one-dimensional time series is effective for a certain range of initial information. In addition, the values of the initial observations can differ significantly for each specific case, respectively, the widespread use of one method for the analysis of arbitrary information can lead to significant inaccuracies. Thus, the problem of choosing a forecasting method for the initial set of agrometeorological data arises. In this regard, a universal adaptive probabilistic-statistical approach to predicting agrometeorological risks is proposed, which makes it possible to solve the problem of choosing a model. The article presents the results of the first stage of research carried out with the financial support of the Ministry of Education and Science of the Russian Federation a brief overview of the current state of research in this direction is presented, theoretical foundations for predicting agrometeorological risks for a possible onset of drought and frost have been developed, including the task of generating initial information, a description of basic forecasting models, and also a direct description of the proposed approach with a presentation of the general structure of an intelligent system, on the basis of which the corresponding algorithm can be developed and automated as directions for further work.

dc.description.sponsorship

value: This work is supported by the Russian Federation (agreement with the Ministry of Science and Education) (project N 075-15-2020-805 dated October 02, 2020).

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Applied Mathematics. Computer Science. Control Processes;Volume 17; Issue 2

value: one-dimensional time series

value: forecasting

value: droughts

value: frosts

value: agrometeorological hazards

value: intelligent system


dc.contributor.author

value: Goloskokov, Dmitry Р.

value: Matrosov, Аlexander V.

dc.identifier.citation

value: Goloskokov D. Р., Matrosov А. V. Bending of a ribbed plate under complex loading. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 120-130.

dc.description.abstract

value: The article considers the problem of a rectangular plate, supported by a cross system of stiffening ribs, bending. In addition to the transverse load, the plate is subjected to forces in its plane, transmitted through the ribs. Аn analytical solution to the boundary value problem for the resolving differential equation with respect to the normal deflection of the plate, describing the deformation of a rectangular plate supported by stiffeners, is obtained. The solution is presented in the form of series in combinations of regular and special discontinuous functions, which converge quickly and lead to a simple computational algorithm. The influence of the ribs is taken into account in the equation in the form of additional terms containing factors with a delta function. This approach allows us to get rid of a number of assumptions regarding the interaction of the plate with its reinforcing elements. The use of the apparatus of generalized functions when modeling objects of this type simplifies the boundary conditions (there are no conditions for conjugation of various structural elements), but at the same time the differential equations become more complicated. The problem is reduced to the so-called partially degenerate equations. Development of analytical methods that allow obtaining exact solutions of differential equations of this type, and their introduction into computational practice, is one of the urgent tasks of the mechanics of objects with disturbed regularity.

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

value: plate

value: stiffeners

value: mathematical model

value: numerical-analytical methods

value: special discontinuous functions

value: Dirac function

value: Heaviside function

value: Fourier series

value: orthogonal series

dc.type

value: Article


dc.identifier.citation

value: In memoriam of Fedor Fedorovich Rodyukov (1936–2020). Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 379–380.

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 8 (66); Issue 2


dc.identifier.citation

value: Session of Section of the House of scientists of the Russian Academy of Sciences on the theoretical mechanics of prof. N. N. Poljakhov. December 16, 2020. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, p. 358.


dc.identifier.citation

value: Session of Section of the House of scientists of the Russian Academy of Sciences on the theoretical mechanics of prof. N. N. Poljakhov. November 11, 2020. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, p. 269.


dc.contributor.author

value: Touail, Youssef

value: El Moutawakil, Driss

dc.identifier.citation

value: Touail Y., El Moutawakil D. Fixed point theorems for new contractions with application in dynamic programming. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 338–348.

dc.description.abstract

value:
In this study, we give a generalization of the well-known Reich fixed point in the setting
of general topological spaces with τ -distances. As applications of the obtained result, we
prove some fixed point theorems for new contraction types in metric spaces. Moreover, we
establish the existence and the uniqueness of solutions for a class of functional equations
arising in dynamic programming.

dc.subject

value: fixed point

value: strict contraction

value: generalized E-weakly contractive maps

value: metric spaces

value: Hausdorff topological spaces

value: dynamic programming


dc.contributor.author

value: Nesterchuk, Grigory A.

dc.identifier.citation

value: Nesterchuk G.A. Buckling of a clamped supported cylindrical shell. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 247–254.

dc.description.abstract

value:
The paper considers problem of buckling of a thin elastic cylindrical shell, supported by
rings of various stiffness. The approximate solution for clamping edge was obtained with
analytical Rayleigh Ritz method. The parameters of the optimal distribution of the mass
of the structure between the shell and the stiffeners are found in order to maximize the
critical pressure. Frames with zero eccentricity are considered. The obtained analytical
solutions are compared with the solution by the finite element method.

dc.description.sponsorship

value: This work is supported by Russian Foundation for Basic Research (grant no. 19-01-00208).

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

dc.subject

value: stiffened cylindrical shell

value: asymptotic methods

value: buckling


dc.contributor.author

value: Аlexandrova, Irina V.

value: Zhabko, Аlexey Р.

dc.identifier.citation

value: Аlexandrova I. V., Zhabko А. Р. Lyapunov - Кrasovskii functionals for homogeneous systems with multiple delays. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 183-195.

dc.description.abstract

value: In this article, explicit constructions of Lyapunov - Кrasovskii functionals are proposed for homogeneous systems with multiple constant delays and homogeneity degree of the right- hand sides strictly greater than one. The constructions are based on the Lyapunov functions suitable for the analysis of corresponding systems with all delays equal to zero. The letter systems are assumed to be asymptotically stable. It is proved that the proposed functionals satisfy the conditions of the Кrasovskii theorem, and hence it allows us to establish the asymptotic stability of the trivial solution for arbitrary values of delays. The functionals are applied to the estimation of the attraction region of the trivial solution.

dc.description.sponsorship

value: This work was supported by the Russian Science Foundation (project N 19-71-00061).

value: Vestnik of St Petersburg University. Applied Mathematics. Computer Science. Control Processes;Volume 17; Issue 2

dc.subject

value: time delay systems

value: homogeneous systems

value: asymptotic stability

value: Lyapunov-Кrasovskii functionals

value: attraction region

dc.type

value: Article


dc.contributor.author

value: Petrov, Аlexander G.

dc.identifier.citation

value: Petrov A.G. The inverse problem of stabilization of a spherical pendulum in a given position under oblique vibration. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 255–269.

dc.description.abstract

value:
The inverse problem is posed of stabilizing a spherical pendulum (a mass point at the end
of a weightless solid rod of length l ) in a given position using high-frequency vibration of
the suspension point. The position of the pendulum is determined by the angle between
the pendulum rod and the gravity acceleration vector. For any given position of the pendulum,
a series of oblique vibration parameters (amplitude of the vibration velocity and the
angle between the vibration velocity vector and the vertical) were found that stabilize the
pendulum in this position. From the obtained series of solutions, the parameters of optimal
vibration (vibration with a minimum amplitude of velocity) are selected depending on the
position of the pendulum. The region of initial conditions is studied, of which the optimal
vibration leads the pendulum to a predetermined stable position after a sufficiently long
time. This area, following N. F.Morozov et al., called the area of attraction.

dc.description.sponsorship

value: The work was performed on state assignment (no. ААА-А20-120011690138-6).

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 8 (66); Issue 2

dc.subject

value: spherical pendulum

value: stability

value: vibration of the suspension point

value: inverse problem


dc.contributor.author

value: Popov, Alexander L.

value: Sadovsky, Sergei А.

dc.identifier.citation

value: Popov A. L., Sadovsky S.А. On the correspondence of theoretical models of longitudinal vibrations of a rod with experimental data. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 270–281.

dc.description.abstract

value:
A number of theoretical models are known for describing longitudinal vibrations of a rod.
The simplest and most common is based on the wave equation. Next comes a model that
takes into account lateral displacement (Rayleigh correction). The Bishop model is considered
to be more perfect, taking into account both transverse displacement and shear
deformation. It would seem that the more perfect the theoretical model, the better it
should be consistent with experimental data. Nevertheless, when comparing with a really
defined experimental spectrum of longitudinal vibrations of a rod on a large base of natural
frequencies, it turns out that this is not quite so. Moreover, in the relative loss is the most
complex Bishop model. Comparisons were made for a smooth long cylindrical rod. The
questions of refinement with the help of experimentally found frequencies of the velocity of
longitudinal waves and the Poisson’s ratio of the rod material are also touched.

dc.description.sponsorship

value: This work is supported by Russian Foundation for Basic Research (project no. 19-01-00100).

dc.publisher

value: St Petersburg State University

dc.subject

value: longitudinal vibrations

value: wave equation

value: Rayleigh correction

value: Bishop correction

value: experimental data


dc.contributor.author

value: Plavnik, Rinat A.

value: Zavialov, Ivan N.

value: Konyukhov, Andrey V.

value: Vetoshkin, Denis S.

dc.identifier.citation

value: Plavnik R.A., Zavialov I.N., Konyukhov A.V., Vetoshkin D. S. Determination of the transition curve between flow modes during filtering an acid through a chemically active porous medium. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2021, vol. 8 (66), issue 2, pp. 349–358.

dc.description.abstract

value:
It is known that during the filtration flow, if the displacing liquid can chemically react
with the skeleton while emitting a gas phase, then this flow mode may be unstable. During
the filtration process, pressure fluctuations will be observed, and the displacing fluid will
move in waves called “acid waves”. Our research suggests a simple theoretical model that
gives a qualitative explanation of the causes of this phenomenon. We conducted laboratory
simulations and detected the boundary of the appearance of “acid waves”, depending on the
concentration of the chemically active component. At the same time the theoretical model
can also predict the appearance of “acid waves” in the laboratory experiment, which will
allow scaling the studied phenomenon in the future.

dc.language.iso

value: ru

dc.subject

value: self-oscillating mode

value: acid treatment of an oil reservoir

value: porous medium

dc.title

value: Article


dc.contributor.author

value: Kotina, Elena D.

value: Ovsyannikov, Dmitri А.

dc.identifier.citation

value: Кotina Е. D., Оvsyannikov D. А. Mathematical model of joint optimization of programmed and perturbed motions in discrete systems. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 213-224.

dc.description.abstract

value: А new mathematical model for the optimization of discrete systems is constructed in the article. The program motion and the ensemble (beam) of perturbed motions are investigated. In this case, the authors consider the joint optimization of smooth and non-smooth functionals defined on the program and perturbed motions. The variation of the functional and the necessary optimality conditions are provided. The developed mathematical technique allows solving non-standard control and optimization problems in various fields of science and technology.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Applied Mathematics. Computer Science. Control Processes;Volume 17; Issue 2

dc.subject

value: discrete systems

value: functional variation

value: smooth and non-smooth functionals

value: optimization

value: optimal control


dc.contributor.author

value: Drivotin, Oleg I.

dc.identifier.citation

value: Drivotin О. I. Оn momentum flow density of the gravitational field. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2021, vol. 17, iss. 2, pp. 137-147.

dc.description.abstract

value: Momentum is considered on the basis of the approach widely used in the calculus of variations and in the optimal control theory, where variation of a cost functional is investigated. In physical theory, it is the action functional. Action variation under Lie dragging can be expressed as a surface integral of some differential form. The momentum density flow is defined using this form. In this work, the momentum balance equation is obtained. This equation shows that the momentum field transforms into a momentum of a mass. Examples showing the momentum flow structure for a mass distribution representing a uniform thin layer are provided.

value: action variation of the gravitational field

value: momentum balance equation

value: thin layer with uniform mass distribution


dc.contributor.author

value: Yarovoy, Gleb

dc.identifier.citation

value: Yarovoy G. EU-Russian cross-border cooperation between (de-)securitization and paradiplomacy: In search of new approaches towards cross-border governance. Vestnik of Saint Petersburg University. International Relations, 2021, vol. 14, issue 2, pp. 156–181.

dc.description.abstract

value:
For almost 30 years, cross-border cooperation between Russia and the European Union has
been balancing between cooperation and control, geopolitics and paradiplomacy. In different
periods of relations, the dominance of one or another logic of development is noticeable.
In the “post-Crimean” period of international relations in Europe, cross-border cooperation
remained one of the few spheres of interaction between Russia and the EU which showed
somewhat positive dynamics, or at least had not degraded significantly. The Karelian section
of the Russian state border attracted close attention from both Russian and Western researchers
in the 1990s due to the rapid pace of institutionalization of cross-border cooperation. The
creation of Euregio “Karelia” in 2000 and the launch of cross-border cooperation programs
within the framework of the European Neighborhood Policy helped to maintain research interest.
In recent years, the negative dynamics of relations between Russia and the EU has led
to a noticeable decrease in the research interest to some issues of EU-Russian cross-border
cooperation. At the same time, cross-border cooperation projects continue to have a positive
impact on the development of border communities, and the cross-border governance system
continues to develop and transform. Thus, the study of the dynamics of cross-border cooperation
in the Euregio “Karelia” is still of scientific interest. It makes it possible to answer specific
questions about the peculiarities of interaction between Karelia and Finland, as well as more
general questions related to EU-Russian relations. Based on the analysis of discursive cooperation
practices inherent to different participants of the cross-border cooperation in the Euregio
“Karelia”, the article shows why positive interaction of actors is still possible, and what vector
of development can be expected for the regional cooperation between Russia and the EU in
the medium-term perspective.

dc.description.sponsorship

value:
The work on the article was partly carried out within the framework of the project “Towards good
neighbourliness with higher education cooperation”, supported by the Koneen Säätiö.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. International Relations;Volume 14; Issue 2

value: EU-Russian relations

value: cross-border region

value: paradiplomacy

value: Euregio Karelia

dc.type

value: Article


dc.contributor.author

value: Deriglazova, Larisa V.

value: Menkh, Viktor V.

value: Chepchugova, Alina P.

dc.identifier.citation

value: Deriglazova L. V., Chepchugova A. P., Menkh V. V. Phenomenon of social exclusion in the EU countries: Definition and measurements. Vestnik of Saint Petersburg University. International Relations, 2021, vol. 14, issue 2, pp. 201–224.

dc.description.abstract

value:
The article analyses the phenomenon of social exclusion and the EU policy in combating this
problem. The article is based on the analysis of the works of European researchers, official
EU documents and Eurostat statistical data. The concept of social exclusion began to develop
actively in the second half of the 20th century, and quickly had been used by politicians of
European countries to develop effective social policies and to fight poverty. The concept of
social exclusion is not a synonymous to the concept of poverty, because exclusion offers a
comprehensive study of the causes of poverty in developed societies and suggests theories that
explain the causes of poverty. The concept of social exclusion becomes a policy tool, as it offers
concrete directions for reduction of poverty and marginalized groups through system of
targeted support, as well as actions to reduce the marginalization of groups and people living
in poverty. The article presents methods of measuring this phenomenon that are used by the
EU institutions to assess if individuals are at risk of poverty and social exclusion. In Russia,
researchers and official representatives are noticeably interested in the concept of social exclusion.
Methods of measuring poverty and social exclusion offered in the EU countries are being
tested and discussed. Given the complexities of the transformation of social policy in modern
Russia, taken pension reform, reform of public health system, family policy, and education, it
is likely that the problem of social exclusion will remain being a distant target. Nevertheless,
the interest of Russian specialists and officials to the problem and development of methods for measuring poverty using the experience of scientists from European countries provides some
ground for optimism.

dc.publisher

value: St Petersburg State University

dc.subject

value: social exclusion

value: poverty

value: European Union

value: social policy


dc.contributor.author

value: Danilov, Dmitry A.

dc.identifier.citation

value: Danilov D. A. Russia-EU political relations: Evolution and prospects. Vestnik of Saint Petersburg University. International Relations, 2021, vol. 14, issue 2, pp. 121–138.

dc.description.abstract

value:
The article is devoted to the analysis of the evolution, nature and content of Russia-EU political
relations, formally established by the Partnership and Cooperation Agreement (PCA)
of 1994. The paradigm of building a united Europe and a common European security space in
line with overcoming post-bipolar confrontation and the emergence of post-Soviet Russia as
well as the European Union, established in 1992, as new actors in international arena became
the basis for their cooperative relations, which was built towards strategic partnership. It was
strengthened at the turn of the 2000s, including on the basis of mutual strategies of relations,
when Russia’s “European choice” was declared and the EU’s “new dynamics” in security and
defense dimension were initiated. However, the NATO-centric model of European security and
the policy of expanding Euro-Atlantic institutions to the East created a potential for conflict,
and Russia-EU cooperation entered a phase of a latent crisis, especially as a result of differing
interests in the so-called common neighborhood. Attempts at a new strategic start by the adoption
of Russia-EU Roadmaps on the four common spaces and by planning the negotiations on
a new basic agreement failed to overcome fundamental disagreements and contradictions. The
Ukrainian conflict became the culmination of the Russian-European crisis and fundamentally
changed the direction and content of Russia — EU relations. The defining of the future strategy
of relations is becoming increasingly acute, which is considered in the article as a challenge of
strategic choice for the parties. The author substantiates the prospect of overcoming the “new
normality”, which is boils down to maintaining a controlled mutual deterrence, although it
does not exclude the option of terminating the Russia-EU legal relations (“breakesit”).

dc.language.iso

value: ru

dc.subject

value: Russia–EU

value: strategic partnership

value: European security

value: EU enlargement

value: confrontation

value: CFSP

value: strategic autonomy

value: crisis

value: breakesit


dc.contributor.author

value: Podzuban, Elena V.

dc.identifier.citation

value: Podzuban E. V. Diachronous Settlement on the Territory of the Turgay Trough. Vestnik of Saint Petersburg University. History, 2021, vol. 66, issue 2, рp. 602–629.

dc.description.abstract

value:
The article introduces into the scholarship the collection of findings of prehistoric material
culture obtained at Bestamak during the stationary studies of 2001 field season. The total
area of the archaeological site is 260,000 m2. It was excavated by Turgay expedition in the
1980s. Bestamak settlement is situated on the Turgay trough connecting the West Siberian
and Turan plains. In the west, the Turgay trough is bounded by the Trans-Ural Plateau; in the
east — by the Kazakh upland and spurs of the Ulutau mountains. Natural and geographical
features of Turgay trough allow for their cultural layers to mainly contain diachronous material,
with Bestamak serving as an example. Due to this specificity, the collections of stone
industry discovered in the monuments of the Turgay trough should be studied on the basis of
technical and typological analysis, the main parameters of which being products of primary
cleavage; morphological parameters of the plates, the size of plates and tools on the plates; percentage
ratio of ingots and tools from plates and rock flakes; secondary processing methods;
typological composition of tool kit. The composition of raw materials is used as an independent
indicator. In the course of the research, the author concluded that the primary cleavage,
nuclei “rejuvenation” and secondary processing of blanks were performed on the site of the
settlement. Judging by the results of the technical and typological analysis, the stone industry
was deposited from the end of the Mesolithic-the Early Neolithic to the Late Eneolithic.
The Neolithic stone industries, starting from the early and late Eneolithic, are predominant
at Bestamak. The presence of Mesolithic and Early Eneolithic stone industries on the site is
just an assumption. Fragments of ceramics and metal products suggest that people stayed at
Bestamak until Late Bronze.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. History;Volume 66; Issue 2

dc.subject

value: Neolithic period

value: Turgai trough

value: stone industry

value: technical and typological analysis

value: scrapers

value: knives

value: quartzite sandstone

dc.title

value: Article


dc.contributor.author

value: Khoruzhenko, Oleg I.

dc.identifier.citation

value: Khoruzhenko O. I. The Seal of Novgorod Veche in Publications and Researches. Vestnik of Saint Petersburg University. History, 2021, vol. 66, issue 2, рp. 630–643.

dc.description.abstract

value:
The article is devoted to so-called “seal of the Novgorod veche” or “the seal from the collection
of Count M. V. Tolstoy”, which not only has been periodically published since the second half
of the 19th century, but also has been undergoing transformations from publication to publication.
It is often interpreted in the scholarchip as the 15th-century monument of sphragistics. It
supposedly sealed decisions of the Novgorod veche — the supreme authority of the Novgorod
Republic, i. e. having been in use until 1478. The iconography of the seal enables some authors
to suggest the emergence of the attributes of Novgorod independence — the “veche stepen”,
which is understood as a platform for orators to speak, and the rod of the Novgorod archbishop.
This article attempts to trace the history of the development of this approach to the monument
of sphragistics and to understand whether this source meets the requirements applied by
researchers. The author demonstrates that all known images of the seal are rooted in the only
source — the illustration in the 1855 corpus by of A. B. Lakier of 1855 reproducing the seal of
Novgorod voevodas of the late 16th — early 18th centuries. The version that this seal belonged
to the Novgorod veche was formed in the second half of the 19th — early 20th centuries, but
took its final shape in the presentation by A. V. Artsikhovsky. Unfortunately, the ingenious and
outwardly convinving idea of Artsikhovsky is refuted by the whole complex of monuments of
Novgorod sphragistics.

dc.language.iso

value: ru

dc.subject

value: sphragistics

value: heraldry

value: Veliky Novgorod

value: veche

value: miniatures

value: The Facial (Illustrated) Chronicle

value: Bullas

value: Seals

value: Coat of arms


dc.contributor.author

value: Dauvalter, Vladimir A.

value: Slukovskii, Zakhar I.

value: Denisov, Dmitrii B.

value: Cherepanov, Alexander A.

dc.identifier.citation

value: Dauvalter, V. A., Slukovskii, Z. I., Denisov, D. B., Cherepanov, A. A. (2021). Features of the chemical composition of water in the urban lakes of Murmansk. Vestnik of Saint Petersburg University. Earth Sciences, 66 (2), 252–266.

dc.description.abstract

value:
The article presents the results of studies of the hydrochemical composition of five urban lakes
of Murmansk. It was found that the chemical composition of the water of the studied urban
lakes is significantly different from the composition of the lakes of the northeastern part of
the Murmansk region of the Barents Sea catchment, which was taken as the background. The
water pH values have increased in comparison with the background values, as well as mineralization,
the content of major ions, nutrients, and heavy metals. An increase in the content
of the main cations of alkaline and alkaline-earth metals (Ca2+, Mg2+, Na+ и K+), as well as the main anions (HCO3
–, SO4
2–, Cl–), is associated with the influence of urban environments,
including the use of reagents for deicing of roads. Due to the influx of marine aerosols in the
waters of urban lakes, the content of other alkaline (Li and Rb) and alkaline-earth (Sr and Ba)
metals, as well as B and Br, is increased. Mineralization of water in the Murmansk lakes is ten
times higher than the values recorded in the lakes of the northeastern part of the Murmansk
region of the Barents Sea catchment. In the water of urban lakes, the content of compounds of
the nitrogen group, especially the ammonium ion, is significantly increased, which indicates
the formation of a restorative environment that has a detrimental effect on hydrobionts. Lakes
Ledovoe and Yuzhnoe are the most polluted among the studied lakes, characterized by the
highest content of the above-mentioned indicators, as well as many heavy metals (Ni, Cu, Zn,
Co, As, Mo and W). At the same time, there is a decrease in the content of organic substances
in the most polluted lakes due to inhibition of biological processes.

dc.description.sponsorship

value:
The study was carried out within the framework of the research project No. 0226-2019-0045 (field
work) and with the support of the grant No. 19-77-10007 of the Russian Science Foundation (chemical
analysis).

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Earth Sciences;Volume 66; Issue 2

value: hydrochemistry

value: urban lakes

value: heavy metals

value: pollution

value: Murmansk region


title: The Warrior on Claps from Tillya Tepe

dc.contributor.author

value: Skupniewicz, Patryk

value: Maksymiuk, Katarzyna

dc.identifier.citation

value: Skupniewicz P., Maksymiuk K. The Warrior on Claps from Tillya Tepe. Vestnik of Saint Petersburg University. History, 2021, vol. 66, issue 2, рp. 567–584.

dc.description.abstract

value:
Among the objects excavated in 1978 at the site of Tillya Tepe (Northern Afghanistan) by
the Soviet-Afghan archaeological expedition led by Victor I. Sarianidi, the twin golden clasps
from Burial III attract special and instant attention of any military historian or a researcher
of ancient arms and armour. The identity of the personage(-s) on the Tillya Tepe clasps has
quite rarely been studied. Scholars are usually satisfied with a generic term a “warrior”. Kazim
Abdullaev has identified the personage as Ares-Alexander. Jeannine Davis-Kimball has identified
the personage as Enaree, the castrated priest of one of the epiphanies of Great Goddess.
Patryk Skupniewicz supported the latter identification associating the personages from Tillya
Tepe clasps with the North Indian, mainly Gandharan iconography of Skanda Kartikeya who,
as a war-god, was an Indian equivalent of Ares. This article establishes the correspondence
between the images on Tillya Tepe clasps with the representations of enthroned and armed
goddesses which are quite common in the iconography related to the discussed clasps. The
armed and enthroned goddess has been identified as the Iranian goddess Arshtat on Kushan
coins. The warrior depicted on the golden clasps from Tillya Tepe should be interpreted as a
portrayal of Arshtat, whose image was borrowed from the iconography of Athena. The goddess
is shown seated on the throne with griffin-shaped legs known already in the Achaemenid
times in the pose developed in the images in the late Hellenistic period, which is in line with
the date of the entire site.

dc.description.sponsorship

value:
This research was supported by the Ministry of Science and Higher Education of Poland (grant
No. 107/20/B). We would like to thank all the anonymous reviewers and Jowita Buńko for correcting the
text.

dc.language.iso

value: en

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. History;Volume 66; Issue 2

value: Tillya Tepe

value: Central Asia

value: arms and armour

value: Alexander the Great

value: Arshtat

value: Enaree

dc.title

value: The Warrior on Claps from Tillya Tepe

dc.type

value: Article


dc.contributor.author

value: Ostashinskii, Sergei M.

value: Cherlenok, Evgenii A.

dc.identifier.citation

value: Ostashinskii S. M., Cherlenok E. A. The Site of the Maykop Culture in the Mountains of the Northwestern Caucasus. Vestnik of Saint Petersburg University. History, 2021, vol. 66, issue 2, рp. 585–601.

dc.description.abstract

value:
The Meshoko rock shelter was first explored in the 1960s. Along with some other settlements
in the vicinity, its materials were interpreted as evidence of the synchronism of the
early Maykop and late Eneolithic cultures. Modern excavations have shown that Maykop and
Eneolithic finds are concentrated in different layers, with natural deposits between them. The
stratigraphic sequence of the Meshoko rock shelter consisted of six main layers. Maykop artifacts
were in the third layer from above. The most interesting object discovered there is the
hearth, the base and walls of which were formed by limestones. No evidence of a dwelling was
found, which probably indicates the temporary nature of the settlement. The few Eneolithic
materials cannot be confidently synchronized with the Maykop culture. It is more likely that
they were introduced into the third layer through pits which were dug down from the Maykop
level. The bulk of the collection of the third layer is associated with the Maykop culture, most
likely with the middle stage of its development (Inozemtsevo-Kostromskaia). This conclusion
corresponds to the radiocarbon dates of the settlement, which were about 3600–3000 BC.
The Meshoko rock shelter is located at the bottom of the mountain gorge. This is unusual for
Maykop sites, which, as a rule, occupy the steppe and flat areas of the foothills. Also, there
are no close analogies in the paleoethnobotany and archaeozoology assemblages. The study
of these ecofacts indicate that the Maykop population probably lived in a forest zone and was
well adapted to the conditions of the local environment.

dc.publisher

value: St Petersburg State University

dc.subject

value: the Northwestern Caucasus

value: the Maykop culture

value: Eneolithic

value: cultural attribution

value: chronology


dc.contributor.author

value: Alefirenko, Nikolay F.

value: Nurtazina, Maral B.

value: Stebunova, Kira K.

dc.identifier.citation

value: Alefirenko N. F., Nurtazina M. B., Stebunova K. K. In search of cognitive and linguistic methodology for discourse studies. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 313–338.

dc.description.abstract

value:
This work is devoted to the study of theoretical and methodological problems of modern
discourse open for discussion. Being an object of interdisciplinary interests, discourse studies
profess various methodological principles and theoretical categories. Taking into account
the positions of different humanities using the discourse category, the authors of the article
consider the methodological primary basis of discourse-analysis to be the identification of
communicative-cognitive correlation of a literary text’s speech meaning and discourseforming
concepts as the basis of author’s and reader’s thought code. The category “discursive
activity” introduced and interpreted by the authors correlates with linguistic activity: the
four-element model of cognition and communication. It is proved that discursive activity is
built not on the traditional three “whales”, but four. A communicative event is projected by:
1) object realities; 2) sensual perception of realities in the form of objective and previously
stored in memory phonetic representations; 3) a discursive model of the future (supposed)
text, which is constructed by ideal phenomena — concepts; 4) such ideal units as “internal
words”. This allows for the interpretation of discourse as a schematic means of mentally
constructing a communicative situation in the aggregate of its verbal/non-verbal elements.
The developed discourse analysis in the work is based on the interpretation of a system of
concepts, which are a cognitive substrate of a discursive situation and serve as the pre-text
model of the event experienced by communicants as a real fact. An adequate interpretation
of semantic relations between keywords and basic concepts is important in the developed cognitive-linguistic methodology of discourse analysis. The contextual interpretation method
and discourse analysis were used in the work.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Language and Literature;Volume 18; Issue 2

dc.subject

value: discourse-analysis methodology

value: communicative event

value: meaning

value: logo-episteme

value: concepts


dc.contributor.author

value: Barsht, Konstantin A.

dc.identifier.citation

value: Barsht K. A. The return of poetics. Julia Kristeva vs Mikhail Bakhtin. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 242–261.

dc.description.abstract

value:
The article offers an analysis of the concept of “intertext” that has been put forward by Julia
Kristeva in her work “The Destruction of Poetics” in comparison with Mikhail Bakhtin’s idea
of a universal context and “infinite dialogue”. It is concluded that Kristeva incorrectly perceived
Bakhtin’s thoughts about context and dialogue, which are personalistic in nature in
contrast to Kristeva’s impersonal one based on the Freudian-driven “It” and social factors of
the “intertext”. The article analyzes the theoretical basis of this concept, including the crisis in
literary theory in the 1970s–1980s where there was frustration by the European and Russian
scientific community in the universalism of binary oppositions. In this regard, the issue of
overcoming the theoretical difficulties of literary aesthetics with the help of the ternary model
of aesthetic communication (“metalinguistics”), which was developed by Bakhtin in his works
since the 1930s and was not heeded by Kristeva, has not yet been mastered in modern philological
science. This concept is based on the idea of aesthetics as metaethics, which is built up
in the process of textual communication over simple binary ethical exchange. The article suggests
that the use of this idea of a ternary (metalinguistic) construction of the communicative
field of a literary work can significantly advance the solution of many problems in theoretical
poetics, in particular, reveal new ways for linking the discursive-textual and axiological fields
of a literary-fiction text into one whole.

dc.publisher

value: St Petersburg State University

dc.subject

value: Julia Kristeva

value: Mikhail Bakhtin

value: intertext

value: dialogue

value: ternary aesthetic communication

dc.title

value: Article


dc.contributor.author

value: Zuseva-Ozkan, Veronika B.

dc.identifier.citation

value: Zuseva-Ozkan V. B. The figure of woman warrior in the poetic dialogue of Valerii Briusov and Nadezhda Lvova. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 277–297.

dc.description.abstract

value:
The article considers the development of the story of a duel between a woman warrior and a
chosen hero in the poetic dialogue of Valerii Briusov and Nadezhda Lvova. The analysis of the
poems constituting this dialogue (“Combat” by Briusov and “Your Helmet Rolled…” by Lvova)
is made with reference to three aspects: gender aspect, life-building which was typical for the
Symbolists and the topics of Briusov’s and Lvova’s works in general. “Combat”, based on the
Eddic plot of Sigurd and Brunhild and submitting to the dominant idea of Briusov’s work (the
idea of a hopeless struggle against Fate), gets transformed and the poem’s motifs are included
in another plot which is central in Lvova’s work — that of lovers engaged in a fight against each
other and fate whilst living and reuniting in the afterlife. The heroine is deprived of her status of
half-goddess and becomes an earthly mortal woman. Although Briusov is not afraid to partly
“feminize” his lyrical hero by showing him defeated in the combat against woman and Fate, and
Lvova gives agency and initiative to the heroine, the gender roles in this male-female dialogue
ultimately turn out to be rather traditional. Briusov’s hero dreams of a duel of equals against
destiny, while Lvova’s heroine dreams of eternal love, which corresponds to gender stereotypes.

dc.description.sponsorship

value:
The study was supported by a grant from the Russian Science Foundation (project No. 19-78-10100)
at the Gorky Institute of World Literature of the Russian Academy of Science.

dc.language.iso

value: ru

dc.subject

value: Valerii Briusov

value: Nadezhda Lvova

value: woman warrior

value: Brunhild

value: poetic dialogue


dc.contributor.author

value: Chernyavskaya, Valeria E.

dc.identifier.citation

value: Chernyavskaya V. E. Social meaning in the mirror of political correctness. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 383–399.

dc.description.abstract

value:
The article addresses two central notions, namely social meaning and political correctness.
The concept of social meaning is well known in “third wave” sociolinguistics, which connects
patterns of language variation with the wider social world, in metapragmatics after Michael
Silverstein, language ideology research and discourse analysis. The analysis is in line with these
research approaches and also reflects back the pragmatic interpretation of social meanings. It
is presumed that the social meaning of a word or an utterance is indexical in its nature and
conveys information about the social context of language use. Social meaning of an utterance
reflects its social embeddedness. In this respect, the perspective of political correctness reflects
the discursive process of social indexicality and social meaning making. The article examines
modern cases of political correctness (PC) in the USA (2017–2020) to show the effects of discursive
pressure on interpretation frames. PC is discussed as a controversial practice and it is
aimed at avoiding expressions or actions that can be perceived to marginalize or insult socially
disadvantaged and discriminated people. At the same time, it can overpoliticize issues and act
as a struggle against implicit meanings and implicatures.

dc.description.sponsorship

value:
The study was supported by Russian Science Foundation (grant no. 18-18-00442) “Mechanisms of
Meaning and Textualization in Social Narrative and Performative Discourses and Practices”.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Language and Literature;Volume 18; Issue 2

value: social meaning

value: contextualization

value: language ideology

value: political correctness

value: overpoliticization


dc.contributor.author

value: Zherebin, Alexej I.

dc.identifier.citation

value: Zherebin A. I. Yuri Tynyanov’s comparative studies in the light of translation theory. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 262–276.

dc.description.abstract

value:
Against the background of the latest trends in the field of translation theory, the article attempts
to distinguish between the terms “translation studies” and “translatology”. The material
for analysis is a number of authoritative studies by Russian and foreign authors, in which
literary translation and translated literature are considered as a fact of cultural transfer and
the subject of comparative literary studies. Variants of the translatological approach are illustrated
by an example from George Steiner’s monograph After Babel: Aspects of Language and
Translation (1975) and Yuri Lotman’s “ ‘Journey to the Island of Love’ by Vasily Trediakovsky
and the function of translated literature in Russian culture of the first half of the 18th century”
(1985). The central part of the article is devoted to the comparative studies of Yuri Tynyanov in the early 1920s. An example of a more traditional translation approach is given by Tynyanovs
study “Tyutchev and Heine” (1922), a classic example of Russian comparative studies
that confirms the thesis that the delimitation and differentiated use of the terms “translation
studies” and “translatology” allow us to more accurately describe the semantic structure of
both scientific texts and those works of art to which they are devoted. On the contrary, in
Tynyanovs study “Blok and Heine” (1921), which is close in theme and when created, both
analytical strategies are present on equal terms; translation studies and translatology complement
each other, forming a synthesis. A typological comparison includes both observations of
Block’s translation strategy, supported by an aesthetic analysis of the works of both poets, and
the posing of the question of the social function of art and the role of the artist in shaping the
modernist metanarrative of personality emancipation.

dc.language.iso

value: ru

value: genesis

value: discourse

value: genre

value: translation studies

value: poetics

dc.type

value: Article


dc.contributor.author

value: Urazayeva, Kuralay B.

value: Azkenova, Zhanargul K.

dc.identifier.citation

value: Urazayeva K. B., Azkenova Zh. K. Manipulation as a rhetorical argument in Chekhov’s poetics. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 298–312.

dc.description.abstract

value:
The article presents the experience of a discursive-oriented approach in the study of works
of fiction and is devoted to the study of manipulation as a rhetorical argument. Summarizing
the results of studying literature from the perspective of communicative strategies required
describing the text as a communicative strategy in its connection with discourse. The analysis
of manipulation is carried out by means of solving problems: classification of external and
internal factors of effective communication, comparison of argumentative strategies of literary
characters with argumentative results, and the establishment of factors of genre transformation.
The interpretation of external factors of influence as a result of the disparity of
communicative settings of heroes, and internal factors of communication as manipulation
of heroes is conducted in the article. The analysis of the author’s point of view from the positions
of metasense and meta-observer allowed the authors of the article to establish a connection
between the genre and the methods of perlocative influence and the organization of the
text as a pervasive program. The differences in the methods of perlocative influence in the
story are explained by allusive illustrative discursivity. The analysis of the comic modality of
the work showed a discrepancy between argumentative strategies and argumentative results,
which revealed the role of manipulation in the genre transformation based on the synthesis of
vaudeville, farce, and social сomedy. The establishment of factors of genre transformation in
Chekhov’s poetics became possible on the basis of the analysis of Chekhov’s humor from the
positions of metasense and semantic gaps.

dc.description.sponsorship

value:
The article was written within the framework of the project of “Formation of a profession multilingual
personality of the type in the conditions of multilingual education of the Republic of Kazakhstan”
(supervisor D-r. of Philology prof. Sh. K. Zharkynbekova) under contract no. 132, March 12, 2018.

dc.publisher

value: St Petersburg State University

dc.subject

value: Chekhov

value: manipulation

value: rhetorical argument

value: A Problem

value: A Marriage Proposal


dc.contributor.author

value: Goncharova, Evgeniia A.

value: Tsutsieva, Mariia G.

dc.identifier.citation

value: Goncharova E. A., Tsutsieva M. G. Linguistic-cognitive and communicative-pragmatic features of a politician’s speech activity in a discursive position “after power”. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 339–362.

dc.description.abstract

value:
The cognitive and speech activity of the linguistic personality of a politician in the discursive
position “after power” has a number of significant differences in comparison with the stages
“before power” and “in power”. Its general cognitive and communicative-pragmatic character
that can be described as accumulative-syncretic, adaptive and agonal, is due, firstly, to the
seamless combination of substantive-thematic and speech signals of the personal and political
past experiences. These experiences are projected onto the issues of the supra-individual
present and included in the forecasts of the social future. These signals are present in texts
generated by the politician during the post-power period. There is a subject-object “stratification”
with a different balance of a subject and/or object functional status in the structure of the
linguistic personality of the post-power politician. As a (proactive) subject of cognition and
communication, the politician “after power” creates his/her own texts, primarily memoirs and
(oral) political speeches. Becoming the object of evaluation, the politician verbally responds
to them as a mental-speech subject of speech utterances in communicative situations of interviews,
political discussions, public responses to articles of other politicians or comments of
journalists that are close or distant to the other side of the communication. At the same time,
being an object, not only with social and professional functions, but also personal qualities of
the ex-politician are publicly discussed, which indicates the mandatory combination of institutional,
professional and individual (third-party) assessment parameters in the structure of
his/her personality.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Language and Literature;Volume 18; Issue 2

dc.subject

value: linguistic personality of a politician

value: discursive position


dc.contributor.author

value: Molodychenko, Evgeni N.

dc.identifier.citation

value: Molodychenko E. N. Metapragmatic discourses in differentiating genres in online media. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 363–382.

dc.description.abstract

value:
One of the possible ways to explore contextualization is through external discourses referencing
the pragmatics of the discourse in question. These are known as metapragmatic discourse.
The purpose of this article is to theoretically integrate the concept of metapragmatics into
genre analysis and apply metapragmatic tools to the analysis of specific genres. Five YouTube
videos together with their accompanying comments exhibiting metapragmatic properties
were analyzed. Methodologically, the analysis relies on the textually oriented content analysis. The results indicate that placing discourses nominally relying on one and the same generic
form into a certain genre may be predicated on contextual variables that may have nothing to
do with said form per se. These variables, however, may be verbalized by the original author
and by their audience in the form of metapragmatic markers. This may mean that for the final
addressee, the “effect” of the original discourse will depend on the attribution of this discourse,
based on the metapragmatic markers, to one of the “competing” genre variations emerging,
as it were, in an ongoing exchange between the author and his audience. A case in point are
sponsored and “honest” review genres. A second observation resides in the realm of hybrid
genres. An example here is integrating sponsored content into one of the “legitimate” lifestylegenres
(“hot tips”, vlog, etc.). A fraction of the discourse community seems to view this as
delegitimizing the discourse and the genre in question, while others see it as an “unfortunate
insert”, which does not, however, change the genre’s overall value. This leaves the question
open whether such genres should be considered new and full-fledged genres, with sponsored
content being one of their integral features.

dc.subject

value: metapragmatics

value: metapragmatic discourse

value: contextualization

value: hybrid genres

value: digital genres

dc.title

value: Article


dc.contributor.author

value: Sharapova, Ekaterina V.

dc.identifier.citation

value: Sharapova E. V. Corpus-based methods in stylistic studies: reshitel’nyi/reshitel’no in Fedor Dostoevskii’s individual style. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 400–416.

dc.description.abstract

value:
The article discusses the idiolectic features of the adjective reshitel’nyi and the adverb reshitel’no
in Fedor Dostoevskii’s writing style. Conceived as one lexical item, reshitel’nyi and reshitel’no
have a semantic structure that includes three blocks of meanings: quality/mode of action;
discursive meaning; intensity (corresponding to the lexical function Magn). The dictionary
definitions suggest that all of them were common to reshitel’nyi/reshitel’no in Russian language
of the 19th century. Ноwever, a corpus-based study shows that reshitel’nyi/reshitel’no in
discursive or intensifying use is one of Dostoevskii’s idiolectic patterns. The study comprises
1219 contexts from Dostoevskii’s five great novels and from Leo Tolstoy’s, Mikhail Saltykov-
Shchedrin’s, Ivan Turgenev’s and Ivan Goncharov’s literary texts accessible in the Russian National
Corpus. The analysis reveals the closeness of intensification tо discursive meanings up
to nondistinction. Almost half of the contexts extracted from Dostoevsky’s texts are discursive
or intensifying uses of reshitel’nyi/reshitel’no. This share is much smaller for the texts of other
authors (12 %, 22 %, 15 % and 14 % respectively). The article considers some types of contexts
and constructions that refer to discursive or intensifying uses of reshitel’nyi/reshitel’no in Dostoesvskii’s
literary texts.

dc.description.sponsorship

value:
The research was carried out within the framework of the RFBR project no. 18-012-90025 “Linguistic
model of Dostoevsky’s idiostyle: corpus technologies in the study of literary text”.

dc.publisher

value: St Petersburg State University

dc.subject

value: discursive word

value: intensifier

value: Magn

value: corpus-based study

value: Fedor Dostoevskii’s individual style


dc.contributor.author

value: Shevchenko, Viacheslav D.

value: Shevchenko, Ekaterina S.

dc.identifier.citation

value: Shevchenko V. D., Shevchenko E. S. Cognitive and pragmatic peculiarities of positive and negative food representation in Russian media discourse. Vestnik of Saint Petersburg University. Language and Literature. 2021, 18 (2): 417–431.

dc.description.abstract

value:
The article is devoted to the analysis of cognitive and pragmatic aspects of food representation
in media discourse as well as peculiarities of the language means of such representation. The
language means used for the realization of cognitive models referring to the spheres of entertainment,
cooking and eating as well as the models referring to the negative aspects of food
representation in Russian media discourse are investigated. The article also studies the connection
between the realization of cognitive models and journalists’ pragmatic goals aimed
at a positive or negative representation of food in media discourse. The cognitive models’
dominant components are analyzed. The promotion of such components as participants, food
and drink, place, entertainment, characteristics of the object (food), action, consequences,
etc., is driven by journalists’ pragmatic goals aimed at drawing attention to particular dishes
or preventing the negative consequences of consuming a certain food. Filling the components
of the cognitive model with particular contents by means of language units results in achieving
the journalist’s goal. The article also investigates the connection between various spheres
of human life established by the representation of food. The authors refer to the peculiarities
of the realization of the cognitive model “Food as a source of danger”. The results of the undertaken
research can be used for analyzing the realization of cognitive models in other types
of discourse as well as in theoretical courses on text linguistics, discourse analysis, and media
linguistics.

dc.language.iso

value: en

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Language and Literature;Volume 18; Issue 2

value: Russian media discourse

value: cognitive models

value: dominant components

value: food


dc.contributor.author

value: Ilyin, Pavel V.

value: Shkerin, Vladimir A.

dc.identifier.citation

value: Ilyin P. V., Shkerin V. A. The Interregnum and the Saint Petersburg Revolt of the Decembrists as Reflected in the Post-Soviet Historiography. Vestnik of Saint Petersburg University. History, 2021, vol. 66, issue 2, рp. 655–671.

dc.description.abstract

value:
The review is devoted to scientific and historical-journalistic works of the late Soviet and
post-Soviet periods which formulate the original versions of the events of the Interregnum
of 1825 and the revolt of the Decembrists. The elimination of the ideological framework of
Soviet studies of the Decembrists emancipated scholarly research and made it possible to put
forward previously impossible concepts and hypotheses. On the other hand, the same circumstance
contributed to the emergence of conspiracy theories and other quasi-scientific or not at
all scientific versions that are not based on the necessary sources, but appeal to a wide range
of readers. As a result, modern literature has developed a contradictory variety of conceptual
models of different levels and quality claiming to explain the events of 1825. This review offers
an experience of understanding the existing range of concepts, versions and hypotheses
in post-soviet historiography. It focuses on the main discussion topics: about the circle of
contenders to the throne (whether it was limited to Grand Dukes or included the Dowager
Empress Maria Feodorovna); about the position and role of the Governor-General of the capital
Miloradovich and the existence of a general opposition or a conspiracy of generals who
supported the transfer of the throne to Grand Duke Constantine; about the role of the secret
society of the Decembrists and the officer conspiracy initiated by him in the Guards Corps;
about other influential political actors (the Russian–American Company, the “German party”,
etc.) presumably opposing the accession of Grand Duke Nicholas.

dc.description.sponsorship

value:
The reported study was funded by RFBR, project “New interpretations of the Decembrist uprising in
St. Petersburg on December 14, 1825: between Science and Conspiracy theories”, number 19-19-50135/19.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. History;Volume 66; Issue 2

value: secret societies

value: interregnum of 1825

value: Decembrist revolt

value: modern historiography

value: conspiracy theories

dc.type

value: Article


dc.contributor.author

value: Kapustina, Olga V.

dc.identifier.citation

value: Kapustina O. V. Рre-war Personal Pensions for Relatives of Prominent Citizens. Vestnik of Saint Petersburg University. History, 2021, vol. 66, issue 2, рp. 404–420.

dc.description.abstract

value:
The article is devoted to the practice of awarding a personal pension on the occasion of the
loss of a breadwinner to the relatives of people outstanding in the sphere of culture, science
and revolutionary movement in the period of 1920–1930. The main sources for analysis include
the pension documents kept in the State archive of the Russian Federation as well as
the personal cases on the issue of granting pensions being in the process of consideration. In
particularly, the archival documents revealed information concerning the pension provision
of the relatives and inheritors of L. Tolstoy’s, F. Dostoevsky’s, N. Chernyshevsky’s, M. Glinka’s,
and F. Dzerzhinsky’s. The documents in questions describe the difficulties they faced during
the early decades of the Soviet period. A special emphasis in the applications is placed on
health problems as personal pensions were granted only to disabled or elderly citizens. The
author underlines that the number of relatives of outstanding people was more numerous than
the one of ordinary people receiving personal pensions. It included not only minor children,
brothers, sisters, spouse and parents, but adult grandchildren, nephews and nieces. It is noteworthy
that the dependence of the applicants on the deceased breadwinners was not always
proved. The results of the research indicate that awarding a personal pension for the loss of a
breadwinner became one of the means to honor the memory of those who provided outstanding
service to the Soviet Republic.

dc.publisher

value: St Petersburg State University

dc.subject

value: personal pension provision

value: services to the state

value: loss of breadwinner

value: descendants and relatives

value: application for pension

value: range of pension recipient

value: disability

value: dependence


dc.contributor.author

value: Peshkov, Alexey A.

value: Chernyshov, Alexey I.

dc.identifier.citation

value: Peshkov, A. A., Chernyshov, A. I. (2021). Petrographic and petrogeochemical features of harzburgites and dunites of the Agardag and Ulor massifs (South-Eastern Tyva). Vestnik of Saint Petersburg University. Earth Sciences, 66 (2), 331–348.

dc.description.abstract

value:
The objects of study are the Agardag and Ulor ultramafic massifs, which are part of the South
Tuva ophiolite belt. The aim of this work is to study the petrographic, petrochemical and
geochemical features of harzburgites and dunites of the studied massifs. As a result of petrographic
study, the main types of rocks that make up the studied massifs were identified.
Harzburgites predominate in the Agardag massif, while dunites are more common in the
Ulor massif. In the Ulor massif, dunites and harzburgites are often plastically deformed by
syntectonic recrystallization with the formation of porphyroclastic structures. The chemical
compositions of olivine and Cr-spinels in harzburgites and dunites in both massifs are similar.
The composition of olivine corresponds to forsterite, while the ultramafic rocks of the Ulor
massif show large variations in Fa and a tendency towards a decrease in NiO. Chromium
spinels in ultramafic rocks of the Ulor massif have wider compositional variations and are
represented by chromites, alumochromite and subferrial alumochromite; they are completely
free of V2O5. According to the composition of Cr-spinels, the degree of melting of ultramafic
rocks was determined, which turned out to be similar for both massifs, ~40–50%. A higher
chromium content of the ultramafic rocks of the Agardag massif is noted, which is probably
responsible for its increased potential chromite content. Ultramafic rocks of the Agardag and
Ulor massifs are intensely depleted formations that arose in similar conditions, which determines
the closeness of their rock and material compositions. The revealed differences are due
to variations in the degree of depletion and the conditions of their consolidation in the earth’s
crust, determined by the structural position, as well as metamorphism of the enclosing frame
and the introduction of later intrusions.

dc.description.sponsorship

value:
The study was carried out within the framework of a grant under the Decree of the Government of
the Russian Federation dated 09.04.2010 No. 220 under an agreement with the Ministry of Education and
Science of the Russian Federation No. 14.Y26.31.0012 dated 20.02.2017.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Earth Sciences;Volume 66; Issue 2

dc.subject

value: ophiolites

value: ultramafic rocks

value: petrography

value: harzburgites

value: dunites

value: petrochemistry

value: geochemistry


dc.contributor.author

value: Acemi, Arda

value: Ergül, Halim Aytekin

value: Kayal, Melih

value: Ekmekçi, Fatih

value: Özen, Fazıl

dc.identifier.citation

value: Acemi, A., Ergül, H. A., Kayal, M., Ekmekçi, F., and Özen, F. 2021. Assessment of Macrophyte Biological Index for Rivers, and evaluation of physicochemical parameters in the Sakarya River Basin of Turkey. Bio. Comm. 66(2): 151–159.

dc.description.abstract

value:
In this study, the Macrophyte Biological Index for Rivers (IBMR) method and
physicochemical measurements were used to assess the trophic status of the
Sakarya River Basin in Turkey. The most abundant macrophytes were Phragmites
australis, Thypa latifolia, Juncus sp., and Paspalum distichum. The IBMR values
varied between 6.00 and 13.00 in spring, and between 6.714 and 14.40 in
the fall season. The sampling stations, which are under the influence of agricultural
runoffs, domestic effluents, and industrial discharges, had hypoxia
accompanied by eutrophic and/or hypertrophic conditions at least in one season.
The individual trophy levels of the sampling sites in the basin have been
assessed as mesotrophic to eutrophic. However, considering the average IBMR
value of all stations, the general trophy level of the basin was close to eutrophic.
The results indicate that the physicochemical parameters are affected by various
effluents discharged to the basin as observed during field studies, and the
obtained data would be useful to apply conservation measures.

dc.description.sponsorship

value:
This research was funded by
the Turkish General Directorate of State
Hydraulic Works (DSI) in the framework of
the “DSI Capacity Development, and Water
Quality Monitoring Project in Sakarya River
Basin” during 2017 and 2018.

dc.language.iso

value: en

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Biological Сommunications;Volume 66; Issue 2

dc.subject

value: ecological quality

value: eutrophication

value: IBMR

value: macrophyte

value: Sakarya River Basin

dc.title

value: Article


dc.contributor.author

value: Dvornichenko, Andrey Yu.

dc.identifier.citation

value: Dvornichenko А. Yu. Historical Science and Petersburg Historian Froianov. Part 1. Vestnik of Saint Petersburg University. History, 2021, vol. 66, issue 2, рp. 327–347.

dc.description.abstract

value:
This article is devoted to the scholarly work of the prominent Russian historian Igor Iakovlevich
Froianov who died last December. He is a brilliant representative of the Petersburg Historical
School, and first and foremost — a well-known specialist in the history of so called Kievan
Rus. He created a complex concept of the “obcshinno-vechevaia” civilization of Old Rus. His
concept is ultimately comprehensive because he studied in consecutive order practically all
sides of such a phenomenon as Kievan Rus: economy, political life, social struggle, culture.
His concept emerged in confrontation with the prevalent Soviet vision of this history, and at
the same time from the very beginning it became a creative continuation and development
of pre-revolution historiography. He also devoted several interesting and important works to
the period of Moscow Rus, particularly to the process of formation of the Russian monarchy.
These works made an excellent foundation for the new original view of this epoch of the Russian
history, different from other concepts. Froianov’s legacy is divided into two parts: before
and after the middle of the 1990s when so called “perestroika” took place in the USSR. On the
one hand, he continued to study the old time. On the other hand, a number of his later works
are devoted to the history of Russian revolution (1917) and to the above-mentioned “perestroika”.
These works are closely connected with a publicistic genre which captivated him in
those years. However, it is to a certain extent a continuation of his previous interests as these
works are dedicated to the same Russian-Orthodox Civilization.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. History;Volume 66; Issue 2

dc.subject

value: I. Ia. Froianov

value: Kievan Russia

value: Moskow Rus

value: “Red October”

value: “submersion in the abyss”