dc.contributor.author

value: Platonova, Elena

value: Davydov, Alexander

value: Erokhina, Maria

value: Mukhin, Andrey

dc.identifier.citation

value: Platonova, E., Davydov, A., Erokhina, M., and Mukhin, A. 2024. Avian malaria parasites (Haemosporida: Plasmodiidae) in mosquitoes (Diptera: Culicidae) of the Curonian Spit (South-East coast of the Baltic Sea). Bio. Comm. 69(3): 185–191. https://doi.org/10.21638/spbu03.2024.306

dc.description.abstract

value:
In recent years, numerous studies have shown an increasing prevalence of
avian haemosporidian parasites in Europe. However, little is known about the
vectors of these parasites, particularly specific dipterian species transmitting
malaria parasites to birds. This study aims to identify vectors of avian malaria
parasites on the South-East Baltic coast. Mosquito females were collected from
2020 to 2021 on the Curonian Spit of the Baltic Sea using traps with birds as
bait. All insects were identified to the species level through morphological features
and the PCR method. Subsequently, they were dissected to extract salivary
glands for studying the presence of avian malaria infecting stages (the sporozoites).
The remaining mosquito parts were used later for molecular analysis
to detect haemosporidian parasite DNA. A total of 596 mosquitoes belonging to
8 species were collected. The analysis revealed that Culex pipiens is a competent
vector of avian Plasmodium relictum (genetic lineages pGRW11 and pSGS1) and
a potential vector for Plasmodium vaughani (genetic lineage pSYAT05) on the
Curonian Spit of the Baltic Sea.

dc.description.sponsorship

value:
This work was supported by the
Russian Science Foundation (project No. 23-
24-00522 for Elena Platonova).

dc.language.iso

value: en

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Biological Сommunications;Volume 69; Issue 3

dc.subject

value: Avian malaria parasites

value: Plasmodium

value: mosquitoes

value: Culex pipiens

value: transmission

value: vectors


dc.contributor.author

value: Soldatova, Elena L.

value: Bartseva, Ksenia V.

value: Alenina, Evgenia A.

value: Tsigeman, Elina S.

value: Likhanov, Maxim V.

value: Vartanyan, Gayane A.

dc.identifier.citation

value: Soldatova E. L., Bartseva K. V., Alenina E. A., Tsigeman E. S., Likhanov M. V., Vartanyan G. A. Nostalgia as a psychological phenomenon: Theoretical review of the research. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 458–484. https://doi.org/10.21638/spbu16.2024.304 (In Russian)

dc.description.abstract

value:
The paper presents a theoretical review of research on the phenomenon of nostalgia — its essential
characteristics, behavioural patterns; and identifies situational contexts that are most relevant
to nostalgic experiences and approaches to the categorisation of nostalgia as a state and
as a trait (proneness); considers the links and relations of nostalgia with various psychological
constructs. Based on previous studies, a generalization of the functions of nostalgia has been
carried out, among which we can emphasise both the functions common to mental states — integration,
reflection, energetic, development, and specific ones — protective, anticipatory and,
complementing reality. The approaches to the study of the place of nostalgia in the system of
mental phenomena are analyzed: in a number of personal characteristics, in connections and
relationships with cognitive functions. The article emphasizes the importance of situational context
for the study of nostalgia, since the parameters of the situation can be triggers of nostalgia,
actualizing its energy, protective and resource functions. The article emphasizes the importance
of situational context for the study of nostalgia, since the parameters of the situation can be triggers
of nostalgia, actualising its energetic, protective and resource functions. Factors mediating
the effectiveness of nostalgia interventions are considered, such as personality traits (the Big
Five and the Dark Triad). The specific nature of situations that evoke nostalgic experiences —
the situation of isolation associated with physical, territorial or social limitations — has been
identified. The conducted analysis allows us to define nostalgia as an integrative mental state,
situationally determined, associated with changes in the individual’s life space, with internal experiences
reflected in the person’s perception of the situation, influencing resilience and subjective
well-being through a mediated relationship with individual characteristics. Despite a relatively
large number of studies, the effects of nostalgia on individuals’ psychological well-being
and resilience remain insufficiently understood and require further research using observational
(including longitudinal) and experimental designs, and samples selected according to different
criteria, particularly those in situations of isolation.

dc.description.sponsorship

value:
The study was supported by the Russian Science Foundation (RSF), project no. 23-18-00142
“Nostalgia as a source of resilience in isolation”. The results were presented at the All-Russian conference
with international participation “Winter Psychological School — 2024”.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Psychology;Volume 14; Issue 3

dc.subject

value: nostalgia

value: nostalgic experiences

value: personality traits

value: situational approach

value: cognitive functions

value: isolation situation

dc.type

value: Article

format: Adobe PDF


dc.contributor.author

value: Morozova, Svetlana V.

value: Gorbunov, Ivan A.

dc.identifier.citation

value: Morozova S. V., Gorbunov I. A. Two psychologies: Specifics of research models. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 434–457. https://doi.org/10.21638/spbu16.2024.303 (In Russian)

dc.description.abstract

value:
A pressing problem in psychology is the quality of the application of mathematical methods
in the practice of psychological research, which was one of the reasons for the emergence of
a replication crisis. Also, recently many publications have appeared criticizing mathematical
statistics in psychological research within the framework of critical psychology. In our opinion,
the following factors play a key role in this problem: 1) the contradiction between the requirement
for comprehensive research and the multiplicity of hypothesis testing; 2) the ability
to put forward or adjust post-hoc hypotheses; 3) the training of psychologists in the field of
mathematical statistics is significantly dependent on the exponential growth in the number of
methods for the study of which limited time is given. Consequently, it is necessary to form lists
of mathematical methods that are preferable in certain areas from the point of view of statistical
practice, the origins of which lie in general methodological principles. The paper examines
the problems of the methodology of applying mathematical methods in psychological articles
from the point of view of the frequency and dynamics of their use, the dependence of the
level of citations and other phenomena on them. It also examines a sample of articles in eight
leading APA journals over the past 110 years that use the most current mathematical methods
in psychology — 24,657 publications. The sample was obtained using queries to the Psyc-
ARTICLES database. Using machine learning methods and automatic data processing, the
raw results of search queries were corrected and validated. The work carried out on standardization
and validation of data of this kind is the first example of work of this nature carried out
in psychology. Based on the validated results obtained using structural equation modeling,
two main factors in the use of mathematical methods were identified. Several alternative models
are considered and compared.

dc.publisher

value: St Petersburg State University

dc.subject

value: mathematical methods in psychology

value: scientific publications

value: statistical practice

value: history of psychology

value: prospects for psychology

value: methodology

value: model

value: disciplinarity

value: branches of psychology

value: APA


dc.contributor.author

value: Kostromina, Svetlana N.

value: Grishina, Natalia V.

dc.identifier.citation

value: Kostromina S. N., Grishina N. V. Wholeness as a fundamental category in describing the nature of personality. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 394– 413. https://doi.org/10.21638/spbu16.2024.301 (In Russian)

dc.description.abstract

value:
The concept of wholeness, which is one of the main concepts in the description of personality,
is discussed. In psychology, wholeness is considered as a characteristic of personality
and as a requirement for its study. In traditional approaches to understanding wholeness, it
is described through the relative constancy of personality substructures, interconnected, or,
in dynamic approaches, through the development of wholeness based on the connection of
existing structures with the emergence of new formations. Violation of the principle of integrity
in research studying individual components of personality became one of the main
reasons for the crisis in personality psychology of the twentieth century. Difficulties in studying
the wholeness of personality are associated, among other things, with differences in its
interpretations, with the polysemy and uncertainty of the concepts that describe it, which is demonstrated by the results of the analysis of the conceptual field in scientific discourse. It is
proposed to consider wholeness as a fundamental category in the description of personality,
along with the categories of variability and stability. Wholeness is understood as an integral
characteristic that works at different levels of the functional organization of the individual,
which correlate with the contexts of the individual’s life. In accordance with the developed
processual approach, integrity is a dynamic formation, the balance of which is ensured by the
balance of the processes of change and stability; the content of the conjugate action of these
processes is the “completion” of the stability of the individual due to the changes that occur.

dc.description.sponsorship

value:
The research was funded by the Russian Scientific Foundation (RSF), project no. 24-18-00308
“Processual model of personality wholeness: theoretical foundation and empirical referents”.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Psychology;Volume 14; Issue 3

dc.subject

value: wholeness

value: integration

value: conceptual description

value: fundamental category

value: processual approach


dc.contributor.author

value: Vzorin, Gleb D.

value: Bukinich, Alexey M.

value: Nourkova, Veronika V.

dc.identifier.citation

value: Vzorin G. D., Bukinich A. M., Nourkova V. V. Reconsidering the “Google effect”: Reduced productivity in externalized information recognition is expedient. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 498–515. https://doi.org/10.21638/spbu16.2024.306 (In Russian)

dc.description.abstract

value:
The decrease in an ability to independently recall information when it is externalized (e. g.,
stored on digital devices), also known as the “Google effect”, has become a subject of empirical
investigation and a growing concern regarding the Internet’s negative impact on cognition.
Several studies have questioned the reproducibility of this effect; however, recent work has
replicated it under conditions where participants were confident in the reliability of subsequent
access to the information, or in other words, in their ability to use the information in
future activities. The findings of this study suggest that the mnemonic “Google effect” may be
expedient, meaning that the reduction in recall of information stored on an external source
does not occur “automatically”, as previously thought, but in accordance with an individual’s
current purposeful and holistic activity. To test this hypothesis, we conducted an empirical
study (N = 69, Me = 20 years) that simulated the work of detective, who assisted the police
in investigating crimes. Initially, participants were presented with graphic stimuli (“clues”),
with instructions based on a narrative explaining what action to take with each (delete, save, scroll through) and how much the material would be needed later (remember the clue, do
not remember, or no clear objective). One week later, there was a memory test that involved
recognizing and selecting stimuli from the first part, as part of the investigative activity in a
detective story. Significantly, clues that needed to be remembered and deleted were recognized
more often compared to those that needed to be remembered and saved or skipped. Meanwhile,
clues that did not need to be remembered were recognized at the same level regardless
of the action taken, significantly better than guess level. Thus, the mnemonic “Google effect”
was reproduced, but only under conditions where the externalization of information was purposeful.

dc.description.sponsorship

value: Research was funded by state assignment no. 0138-2024-0005.

dc.publisher

value: St Petersburg State University

dc.subject

value: “Google-effect”

value: digital amnesia

value: cognitive externalization

value: cognitive offloading

value: cognitive gadgets

dc.title

value: Article


dc.contributor.author

value: Kropachev, Nikolay M.

value: Mikushev, Sergey V.

value: Solovyov, Alexander A.

value: Trapeznikova, Irina S.

dc.identifier.citation

value: Kropachev, N. M., Mikushev, S. V., Solovyov, A. A. and Trapeznikova, I. S. (2024) ‘Determination of the optimal interval of the average load of the scientific equipment of the center for collective use’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 338–354. https://doi.org/10.21638/spbu05.2024.301 (In Russian)

dc.description.abstract

value:
Modern Centers for the collective use of scientific equipment represent the basis for the formation
of unique scientific competencies and competitive advantages in the market of research
services. As highly specialized tools of scientific and innovative infrastructure, whose
activities are aimed at implementing priority areas of scientific and technological development
of the country, Centers funded, including from the state budget, face the need for a reliable
assessment of the effectiveness of public funds investments, which leads to the formation of
an objective need to improve the organization of work in this direction. The state regulator
legislatively establishes requirements for monitoring the effectiveness of the use of expensive
scientific equipment and a unique instrument base, however, the regulatory approach does
not take into account the specifics of the functioning of the CCP regarding specialization, diversity
of the instrument base, etc. This article discusses the problems of applying a standardized
approach to evaluating the effectiveness of the centers for the collective use of scientific
equipment and unique scientific installations. The general nature of the indicators included in
the requirements for centers for the collective use of scientific equipment and unique scientific
installations that have been created and (or) the functioning of which is provided with the
involvement of budgetary funds does not reflect the differences between centers for collective
use in terms of functioning, equipment composition, types of research and other essential characteristics. Attention is focused on one of the leading indicators, namely, the degree of
loading. The authors believe that the averaging of requirements can lead to data distortion
and neutralize the results of state monitoring, and suggest approaches to developing criteria
for evaluating the optimal interval of the average load of scientific equipment of the center
for collective use and justification of the appropriate time of such, depending on the type and
purpose of use. The study was conducted on the example of the Center for Collective Use of
St. Petersburg State University — St. Petersburg State University Science Park.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: St Petersburg University Journal of Economic Studies;Volume 40; Issue 3

dc.subject

value: center for the collective use of scientific equipment

value: optimal loading interval

value: evaluation of the effectiveness


dc.contributor.author

value: Makarcheva, Anastasia V.

dc.identifier.citation

value: Makarcheva A. V. The influence of situational factors on changes in mental state, depending on the level of development of reflection (using the example of students’ educational activities). Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 545–560. https://doi.org/10.21638/spbu16.2024.309 (In Russian)

dc.description.abstract

value:
When considering the determinants of mental state, the most relevant research appears to
be the study of the “situation — mental state” relationship, since this relationship opens up
opportunities for understanding the underlying mechanisms of determination and regulation
of mental states in situations of life. In this context, the consideration of the category of
situation as an element in the structure of mental phenomena remains poorly studied. At the
same time, the success of student learning depends on a well-structured educational situation,
as a structural unit of educational activity, which includes: diverse factors, mental states of
students, their characterological characteristics, etc. Studying the role of the influence of situational
factors on the mental states of students in the learning process, it is noted that in different
educational situations, factors influencing the mental state are given indirect significance.
Based on this, the purpose of this article was to consider the influence of situational factors on
changes in state, depending on the level of development of reflection, using the example of students’
educational activities. The empirical study was conducted in two real learning situations
(lecture and exam), where the lesson was interrupted and respondents were asked to answer methodological questions. 130 respondents took part in the study: 98 girls and 32 boys. All
students are 1st and 2nd year psychologists whose average age was 21 years. Research methods
included logical-theoretical analysis of scientific literature, a testing method and, at the stage
of processing the results, methods of mathematical statistics. It was revealed that in a lecture
situation states of low levels of mental activity are experienced; in an exam situation — highlevel
states. It has been established that in a lecture situation, the following factors influence
the change in the mental state of low-reflective and highly reflective respondents: “Social interaction”,
“Action and behavior”. In an exam situation respondents with a high level of reflection
are influenced by the “Bodily manifestations” factor.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Psychology;Volume 14; Issue 3

value: mental state

value: life situation

value: determinants of mental state

value: level of reflection

value: internal factor

value: external factor

dc.title

size: 1 MB


dc.contributor.author

value: Marchuk, Nikolay P.

value: Turovets, Julia V.

dc.identifier.citation

value: Marchuk, N. P. and Turovets, J. V. (2024) ‘Prospects of hydrogen technologies application in the economic sectors: Priorities of the state and business’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 355–386. https://doi.org/10.21638/spbu05.2024.302 (In Russian)

dc.description.abstract

value:
Discussions around the application of hydrogen technologies in various economic sectors (as
part of the green agenda) contributed to the release of various hydrogen national initiatives.
By the end of 2023, 41 governments have already adopted hydrogen strategies. However, hydrogen
technologies are not mature for widespread adoption due to technological barriers
associated with the production, storage, and transportation of hydrogen. National governments
and private companies invest significant funds in research and development in order to
overcome them. The purpose of this study is to assess current level of hydrogen technologies’
development on the basis of index and other methods to identify the most promising fields
of application. Statistical and analytical materials devoted to the development of hydrogen
solutions were exploited: patent and project activity of private sector, STI policy of net-energy
importers — Germany and South Korea as the example. An analysis of the hydrogen strategies
and the activities of corporations in selected countries revealed that the fuel cell automotive
sector and traditional use of hydrogen (production of ammonia and methanol in the chemical
industry) are among the key areas of application of the studied technologies. Hydrogen
can also be adopted in the electric power industry, etc. Governments that support hydrogen
technologies seek to expand the range of its applications by attracting investments from multinational
corporations from those sectors where hydrogen is already embedded in the chain
of production.

dc.subject

value: hydrogen technologies

value: hydrogen energy

value: energy importers

value: hydrogen infrastructure

value: value chains

value: hydrogen color spectrum

value: hydrogen policy

value: hydrogen projects and investments

value: hydrogen technology application index

dc.type

value: Article


dc.contributor.author

value: Lvova, Nadezhda A.

dc.identifier.citation

value: Lvova, N. A. (2024) ‘Forming a financial model of carbon regulation in the context of the decarbonization objectives for the Russian Federation’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 387–415. https://doi.org/10.21638/spbu05.2024.303 (In Russian)

dc.description.abstract

value:
The article addresses financial issues of carbon regulation. The research purpose was to identify
the features and problems of the financial model development of carbon regulation in the
Russian Federation. The research objectives included substantiation of the model concept,
systematization of models used in international practice, characterization and assessment of
the current stage of the concerning model development in the Russian Federation. According
to the research hypothesis, at the early stages of development, the financial model of carbon
regulation in the Russian Federation is soft, providing rather a signal effect for business and
not having a significant impact on the implementation of national objectives of decarbonization.
In the study of international and Russian experience in the implementation of financial
models of carbon regulation, methods of content analysis and statistical processing of relevant
information were applied. The theoretical results of the research include the analyzed model
concept, a refined classification of its main types and a model of its rigidity index. Systematization
and evaluation of applied aspects of the problem allow us to conclude that the financial
model of carbon regulation in the Russian Federation is super-soft, which has advantages for
business, but actualizes such challenges as the effect of the “green paradox”, the risk of importing
environmental problems from countries with stricter climate requirements and the green
washing problem. It is argued that the development of the financial model of carbon regulation
in the Russian Federation requires improving the system of incentive tools, tightening
climate reporting standards, formalizing requirements for corporate climate strategies, as well
as a differentiated approach adapted to regional business conditions. The research results will
be in demand in further academic and expert work in this field. In particular, they can be used
in climate strategizing, including in substantiating recommendations for the implementation
of the Low-Carbon Development Strategy of the Russian Federation.

dc.description.sponsorship

value:
The author acknowledges Saint-Petersburg State University for a research project (id
PURE)103905601.

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: St Petersburg University Journal of Economic Studies;Volume 40; Issue 3

dc.subject

value: carbon regulation

value: financial model of carbon regulation

value: carbon tax

value: carbon unit

value: emission trading system

value: carbon market

value: decarbonization


dc.contributor.author

value: Guseltseva, Marina S.

dc.identifier.citation

value: Guseltseva M. S. Mindfulness as a factor of personal stability in a changing world. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 414–433. https://doi.org/10.21638/spbu16.2024.302 (In Russian)

dc.description.abstract

value:
The everyday world, the sociocultural reality surrounding a person and its conceptualizations
can nowadays change several times during the life of one generation. At the same
time, changes occurring in reality, in ideas about it and in ideas about the changes themselves
are often not synchronized, creating gaps between objective reality and its subjective
interpretations. The most constructive response to the challenges of a changing world is
mindfulness as a cultural practice and a special state of consciousness. Today, there are
two leading approaches to the phenomenon of mindfulness, one of which belongs to the
Eastern philosophical and religious tradition, and the other to the Western psychological
tradition. A deeper analysis reveals the diversity of facets and interpretations of mindfulness
in modern research. Awareness as a complex socio-psychological phenomenon allows
us to record the processes of transformation of the modern world into a new state. The
observed increase in awareness (and mindfulness) in everyday life and the increased interest
in this phenomenon among scientists represents a spontaneous coping strategy in
a situation of turbulence. Along with this, the thoughtful observer reveals the antinomic
nature of the transformations taking place in the world, where the fashion for mindfulness
is accompanied by the opposite process — mindlessness, or unawareness. Lack of mindfulness
is associated with behavioral automatisms and schematisms of consciousness, with the
absence of doubts about the legality and adequacy of the categories describing reality. The
availability of alternative modes of interpretation, sensitivity to context and to the fluidity of
change can transform mindlessness into mindfulness. One of the cultural practices that foster
mindfulness and awareness today is the Stoicism movement. In methodological terms,
mindfulness refers to those categories that correspond to transdisciplinary approaches and
tasks of integrating psychological knowledge. This integration takes place both at the interdisciplinary
level and within psychology, where the development of mindfulness unites
various psychological approaches and practices and allows us to bridge the notorious gap
between the academy and applied fields of knowledge.

dc.description.sponsorship

value:
The study was supported by the Russian Science Foundation, project no. 22-18-00140 “Dynamic
stability of personality in the space of sociocultural uncertainty”.

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Psychology;Volume 14; Issue 3

dc.subject

value: methodology

value: mindfulness

value: person

value: transdisciplinary approach

value: stoicism


dc.contributor.author

value: Krakovskaya, Irina N.

value: Korokoshko, Julia V.

value: Slushkina, Yuliana Yu.

dc.identifier.citation

value: Krakovskaya, I. N., Korokoshko, J. V. and Slushkina, Yu. Yu. (2024) ‘Digital maturity of industrial enterprises: Evaluation experience’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 433–459. https://doi.org/10.21638/spbu05.2024 (In Russian)

dc.description.abstract

value:
The article is devoted to the study of theoretical and practical aspects of assessing the digital
maturity of enterprises and their readiness for digital transformation in accordance with the challenges of the digital economy. The purpose of the article is to determine the relationship
between digital maturity and digital readiness of enterprises, prerequisites, factors and conditions
for their improvement. The achievement of the goal is ensured by the use of methods of
comparative analysis, a system-structural approach, theoretical analysis of publications, the
use of empirical methods, in particular questionnaires, quantitative methods and qualitative
expert assessment. The possibility of applying digital maturity assessment models to study
the readiness of industrial enterprises for digital transformation is being investigated. The
criteria for assessing the digital maturity and digital readiness of enterprises are highlighted.
In the course of the study, hypotheses were confirmed that there is a direct dependence of the
readiness of industrial enterprises for digital transformation on the achieved level of digital
maturity of technologies and business processes in the company, as well as on the received and
expected effects of digitalization, accumulated economic potential and projected risks. The
main theoretical and methodological conclusions are outlined in the context of the identified
factors, prerequisites, conditions for increasing digital maturity and readiness of enterprises
for digital transformation. The necessity of a systematic study of the influence of digital potential
factors, various external and internal risk factors on the digital readiness of industrial
enterprises for the development of strategies, long-term plans and projects of digitalization
and digital transformation is emphasized.

dc.description.sponsorship

value:
The research was carried out at the expense of the grant of the Russian Science Foundation
no. 22-28-00489 “Development of business models of the industrial sector in the face of challenges of digital
transformation”, https://rscf.ru/project/22-28-00489/.

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: St Petersburg University Journal of Economic Studies;Volume 40; Issue 3

dc.subject

value: digital economy

value: digital transformation

value: digital maturity

value: digital readiness

value: industrial enterprise

dc.title

value: Article


dc.contributor.author

value: Manakhova, Irina V.

value: Kolmykov, Kirill A.

dc.identifier.citation

value: Manakhova, I. V. и Kolmykov, К. А. (2024) ‘Management in the field of decentralized finance based on blockchain technologies’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 416–432. https://doi.org/10.21638/spbu05.2024.304 (In Russian)

dc.description.abstract

value:
Currently, the benefits of decentralization through blockchain technology in the financial sector
are actively discussed, but rarely quantified. This article attempts to examine the potential
benefits and limitations of blockchain technology in improving governance and performance
in digital financial ecosystems. The possibilities of using blockchain technology from traditional
financial structures to the creation of new business models operating on blockchain networks and using smart contracts are shown. The impact of decentralization in the management
of decentralized autonomous organizations (DAOs) on the financial performance of
companies in the field of decentralized finance (DeFi) was assessed. In the process of research,
we use the Gini coefficient as an indicator of inequality among token holders. This metric is
analyzed in the context of return on investment (ROI) for DeFi companies. The method of linear
regression analysis and the rule of interpretation of natural logarithms in regression were
used for calculations. This analysis revealed a significant relationship and positive impact of
decentralization on the functioning and profitability of organizations in the DeFi field. The resulting
relationship indicates that with increasing decentralization in management, the return
on invested capital increases. To improve investment attractiveness and long-term stability,
DeFi companies should consider fairer ways to allocate tokens so that decentralized governance
models based on blockchain and DAO become more profitable. The results and conclusions
obtained from the study are based on academic research articles, open data, industry
reports and company reports in the DeFi industry.

dc.subject

value: blockchain

value: management

value: decentralized finance

value: decentralized autonomous organizations


dc.contributor.author

value: Sagalakova, Olga A.

value: Truevtsev, Dmitry V.

value: Zhirnova, Olga V.

value: Sagalakov, Anatoly M.

dc.identifier.citation

value: Sagalakova O. A., Truevtsev D. V., Zhirnova O. V., Sagalakov A. M. Error-related negativity: Dynamics of a neurocognitive marker of sensitivity to inconsistency in decisions in mental disorders. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 485–497. https://doi.org/10.21638/spbu16.2024.305 (In Russian)

dc.description.abstract

value:
The transformation of methodological ideas about ERN as a significant neurocognitive marker
for clarifying the mechanisms of development and maintenance of mental disorders are
analyzed. The potential is registered in the anterior cingulate cortex 50–100 ms after making
an error in the conflict task and acts as a neurocognitive indicator of sensitivity to decision
mismatches. Comprehension of the provisions on the error monitoring system is discussed
depending on the peculiarities of the clinical group definition, different conditions of activity
(error of another or one’s own, motivational significance, attitude to accuracy, uncertainty,
awareness of the error and other), as well as individual-typological characteristics. The significance
of the error monitoring system in the context of the transition from a categorical
to a dimensional approach to the classification of mental disorders is conceptualized, and
inconsistencies in the data are discussed. ERN is considered as a modulation pattern of the
internalisation-externalisation spectrum of psychopathology, acting as a dimensional psychopathological
model that partially overcomes the problems of comorbidity. Based on the idea
of defining ERN as a transdiagnostic electrophysiological marker of mental health, highly
comorbid disorders, the problem of comparing the features of the error monitoring system in
anxiety and psychotic disorders is analyzed. Studies show specific strengthening of the ERN in
anxiety disorders and weakening in psychosis, but some components of the ERN in psychotic
disorders may remain preserved, and under certain conditions of activity, error detection is
intact. The qualitative rearrangements in the error monitoring system in psychosis reveal a
more complex psychological structure of error identification than the observation of a decline
in this ability.

dc.description.sponsorship

value:
The study was funded by the Russian Science Foundation, project no. 22-28-01310 “Pathopsychological
mechanisms and modern technologies of intervention in auditory hallucinations: The role of
social anxiety and perceived shame in the formation of negative content of ‘voices’”.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Psychology;Volume 14; Issue 3

value: error-related negativity (ERN)

value: neurocognitive marker of anxiety disorders

value: social anxiety disorder

value: obsessive-compulsive disorder

value: psychotic disorder

value: error monitoring system

value: internalizing — externalizing mental disorders

value: a dimensional approach


dc.contributor.author

value: Kleiman, Elena O.

value: Isurina, Galina L.

value: Korotkova, Inga S.

value: Grandilevskaja, Irina V.

dc.identifier.citation

value: Kleiman E. O., Isurina G. L., Korotkova I. V., Grandilevskaja I. V. Psychological factors of adaptation of medical students to a simulation-based learning environment. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 530–544. https://doi.org/10.21638/spbu16.2024.308 (In Russian)

dc.description.abstract

value:
The aim of the present study is to reveal psychological factors of medical students’ adaptation to
simulation-based education. The importance of the study is based on the wide implementation
of simulation technologies in medical education and practical healthcare. The aim of the study
was to investigate the perceptions of medical students regarding simulation training scenarios using
high-tech simulators through the focus group method. The sample comprised 132 medical
students enrolled in the “General Medicine” program, differentiated by their simulation training
experience: 60 students from the 4th and 5th years with experience using high-tech simulators, and
72 students from the 1st and 2nd years without such experience. The transcribed recordings of focus
groups were subjected to coding and thematic analysis. The results have been used to identify
5 thematic blocks characterizing aspects of cognitive and mental representation of the simulation
training environment: physical (technical), psychological and social components, and positive
and negative attitudes. The primary factor affecting training perception is the practical experience
gained, including practicing non-standard situations, mastering tools, acquiring practical skills,
training motor skills, and learning algorithms. The second significant factor is the specific features
of the Simulation Center (SC), such as limited equipment, lack of information, restricted access,
and limitations in interacting with the simulator, including lack of accountability, communication,
and non-technical skills training, subjective perception of the simulator’s cost, and communicative
unrealisticness. In view of the obtained data, which allowed to identify specific stressors associated
with simulation training, further multidimensional study of the adaptation process is planned.

dc.description.sponsorship

value:
The research was supported by the Russian Science Foundation (RSF) grant no. 23-25-00159
“Psychological adaptation of medical students to study using simulation technologies”.

dc.publisher

value: St Petersburg State University

value: psychological adaptation

value: simulation training

value: cognitive representation

value: medical students

value: focus groups

dc.type

value: Article


dc.contributor.author

value: Andrushchenko, Natalia V.

value: Muhamedrahimov, Rifkat J.

value: Iova, Alexander S.

value: Vershinina, Elena A.

dc.identifier.citation

value: Andrushchenko N. V., Muhamedrahimov R. J., Iova A. S., Vershinina E. A. Anxiety, depression and stress of mothers of premature infants with intraventricular cerebral hemorrhages in the first year of their life. Vestnik of Saint Petersburg University. Psychology, 2024, vol. 14, issue 3, pp. 516– 529. https://doi.org/10.21638/spbu16.2024.307 (In Russian)

dc.description.abstract

value:
The study is focused on the emotional state and stress of mothers of prematurely born infants
with structural intracranial changes during the first year of their life. Study participants
were 77 mothers of infants born at 28.3 ± 3.1 weeks of gestation with intraventricular cerebral
hemorrhage, divided in 3 groups: those who received surgical neurosurgical treatment
of posthemorrhagic hydrocephalus (N = 33), conservative treatment for hydrocephalic syndrome
(N = 26), and in the intraventricular cerebral hemorrhage group of 1st degree without
hydrocephalic syndrome (intraventricular cerebral hemorrhage comparison group, N = 18).
The study used measures of depression (BDI-II, 1996) and anxiety (1983), and the Heidelberg
Family Stress Scale (2007). The examination of mothers was carried out longitudinally at three
age stages: 1) during the neonatal period while in the intensive care unit; 2) at the age of 3 corrected
months at the department of pathology of newborns and the department of pathology
of young children; 3) at the age of 12 corrected months at home. Results indicate that in
the group of mothers of prematurely born infants with intraventricular cerebral hemorrhage,
regardless of group membership, the values of depressive experiences and reactive anxiety
are higher at the 1st stage of the examination, compared to 2 and 3. In the group of families
with infants with posthemorrhagic hydrocephalus there were no significant changes observed
in stress indicators during the first years of life of children, while the values of certain individual
indicators are higher compared to the indicators in groups of families of children
with hydrocephalic syndrome and intraventricular cerebral hemorrhage. The results are discussed
from the perspective of possible mental health disorders among mothers of infants
with intraventricular cerebral hemorrhage, its additional negative impact on the development
of children, and the need of families for early, during the first trimester of the child’s life,
beginning of family-centered intervention program and psychological support for mothers.

dc.description.sponsorship

value:
The research work was supported by a grant from the Russian Foundation for Scientific Research
(RFSR) no. 18-013-01183 “Comprehensive study of the development and mental health of prematurely born
infants with intraventricular hemorrhages and posthemorragic hydrocephalus”.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Psychology;Volume 14; Issue 3

dc.subject

value: preterm infants

value: intraventricular hemorrhages

value: caregivers

value: emotional state

value: depression

value: anxiety

value: stress

value: early intervention


dc.contributor.author

value: Kuznetsova, Natalia P.

value: Sutyrin, Sergej F.

value: Shirokorad, Leonid D.

dc.identifier.citation

value: Kuznetsova, N. P., Sutyrin, S. F. and Shirokorad, L. D. (2024) ‘Sergey I. Tyulpanov — statesman and outstanding scientist: Historical role and academic legacy’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 506–523. https://doi.org/10.21638/spbu05.2024.308 (In Russian)

dc.description.abstract

value:
Sergei Ivanovich Tyulpanov is an outstanding scientist, military leader, diplomat, citizen, an
extraordinary person, born in 1901, who for more than eighty years shared the fate of his people and his Motherland. The article presents the joint work of N. P. Kuznetsova, one of Tyulpanov’s
graduate students in the 70s of the last century, S. F. Sutyrin, head of the department
of world economics, who took the baton from the school of the department of international
economic relations and the department of modern capitalism economics in 1996, and professor
L. D. Shirokorad, who spent his entire professional life working on the problems of the
history of economic thought and the development of the Faculty of Economics at Leningrad
State University — St. Petersburg State University. The article is divided into four parts: the
initial stage of Tyulpanov’s military and academic career up to the WWII, military and ideological
activity during the Great Patriotic war, the role of the Soviet military administration in
Germany / SVAG Information Department in the formation of post-war Germany, the creation
of the Department of Modern Capitalism Economics — a unique center for teaching and
studying the economics and politics of developed and developing countries.

dc.description.sponsorship

value: This work is supported by Russian Science Foundation Project: № 19-510-92002.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: St Petersburg University Journal of Economic Studies;Volume 40; Issue 3

dc.subject

value: Information Department

value: department of economics of modern capitalism

value: ideological

value: scientific and teaching activities

dc.title

value: Article


dc.contributor.author

value: Logvinova, Irina L.

dc.identifier.citation

value: Logvinova, I. L. (2024) ‘On the issue of classification of agricultural insurance taking into account modern trends in its development’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 483–505. https://doi.org/10.21638/spbu05.2024.307 (In Russian)

dc.description.abstract

value:
The Russian legislation does not contain the term “agricultural insurance”, however, in modern
publications of Russian scientists and practitioners of the insurance business, this term is
used as a synonym for the term “farm insurance”. The article explores the question of the identity
of these terms, and their content is correlated with the provisions of Russian legislation.
This makes it possible to explore the options for classifying varieties of agricultural insurance
offered in the publications of Russian authors, as well as to propose other options for classifications.
According to the author of the article, the classification of varieties of agricultural
insurance based on a systematic approach and a clearly formulated criterion is important for
identifying the essential features of new varieties for our country and their positioning in accordance
with the provisions of Russian insurance legislation. The classifications proposed
in the article made it possible to formulate the definition of the so-called “index-based crop
insurance” used abroad. A number of Russian scientists propose to introduce such insurance
in our country, but there are open questions related to its compliance with the provisions of
Russian insurance legislation, for example, in terms of determining the object of insurance or
the type of insurance. The article developed three types of classification of varieties of agricultural
insurance: on the basis of a criterion that is used as a confirmation of the fact of the
occurrence of an insured event; based on the number of risks against which the insurance
contract protects; on the basis of the object in which the insured wealth interests materialized.
Positioning of index-based crop insurance in each of the developed classifications made it possible to develop a scientific definition of this type of insurance: index crop insurance is a
special insurance mechanism (significantly different from the classical insurance mechanism),
within which multi-risk business risk insurance is carried out, that is, the risk of a decrease in
income associated with the yield of crops grown for sale, for reasons beyond the control of the
agricultural producer.

dc.language.iso

value: ru

dc.subject

value: agroinsurance

value: insurance of agricultural risks

value: insurance of risks of agricultural enterprises

value: agricultural insurance

value: protection of wealth interests of agricultural producers

value: index-based insurance

value: multi-risk insurance


dc.contributor.author

value: Kunitsyna, Natalia N.

value: Metel, Yuri A.

dc.identifier.citation

value: Kunitsyna, N. N. and Metel, Yu. А. (2024) ‘Modeling the influence of social factors on the dynamics of gray wages’, St. Petersburg University Journal of Economic Studies, 40 (3), pp. 460–482. https://doi.org/10.21638/spbu05.2024.306 (In Russian)

dc.description.abstract

value:
The problem of whitewashing wages of a significant share of Russians escalated during the
pandemic, post-covid recovery and, especially, against the background of geopolitical shocks. The unprecedented expansion of state support measures provided targeted and officially has
prompted entrepreneurs and citizens to get out of the shadows. Despite the obvious positive
changes, the problem of salaries “in envelopes” has not eradicated itself: in modern publications,
scientists return to it repeatedly. When assessing this socio-economic phenomenon,
science relies mainly on methods of regression, panel analysis, instrumental variables, etc. In
this work to assess the influence of social factors on the dynamics of gray wages we used the
gradient boosting method, linear modeling, random forest and a naive Bayesian classifier. As
the initial information, we used the results of the surveys of the Russian Monitoring of the
Economic Situation and Health of the Population by Higher School of Economics, which are
freely available. The result of the simulation is the dependence of the receiving wages method
(official, “in an envelope”) on a number of factors. The organization’s industry affiliation, size,
ownership, employee’s education, duration of vacation, satisfaction with professional growth
and working conditions have the strongest influence. The applied value of the results obtained
is the possibility of generating control effects, both at the state level and at the level of business
entities in the direction of leveling the identified reasons for receiving gray salaries and reducing
the scale of the hidden wage fund.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: St Petersburg University Journal of Economic Studies;Volume 40; Issue 3

value: salary

value: gray salary

value: gradient booster

value: linear models

value: random forest


dc.contributor.author

value: Nasyrov, Ildar R.

dc.identifier.citation

value: Nasyrov I. R. Digital transformation of paradiplomacy: Prospects for Russian regions. Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 342–361. https://doi.org/10.21638/spbu06.2024.307 (In Russian)

dc.description.abstract

value:
Issues of implementation modern information and communication technologies into the
practice of international cooperation of subnational actors and adjustment approaches to the
development of paradiplomacy facing the global consequences of comprehensive digitalization
has been studied in the article. This determines the need of adaptation the vast foreign
and domestic experience of digital diplomacy to the specifics of international relations at the
subnational level and refinement of the terminology used. The main emphasis in the study
is on regional paradiplomacy, since at this level the largest number of opportunities and
challenges associated with cross-border contacts of subnational governments are formed.
International and foreign economic relations of subjects of the Russian Federation are based
on of their powers in this area and the diversity of regional interests. The significance of
international cooperation for the subjects of the Russian Federation is demonstrated by the
analysis of statistical data. Articles by Russian and foreign authors, statutes and regulations,
government programs, materials of international institutions, official websites of federal and
regional authorities, institutions for the development of foreign economic activity have been
studied to achieve the goals of the study. Analysis of the practice of using digital technologies
by federal subjects to promote exports, attract investments, maintaining official and business
contacts, support for compatriots allows for the conclusion about the effectiveness of
interaction of regions with federal authorities and development institutions. This promotes
the involvement of all federal subjects in coordinated work, standardization development of
information assets and data exchange, and the dissemination of best digitalization practices.
The conducted research contributed to identifying the basic trends of digitalization of paradiplomacy.
The main directions of digital transformation of paradiplomacy are considered. The
latter determines the evolution of the model of international relations at the subnational level.
The study confirms that comprehensive processes of digitalization of the main directions of
paradiplomacy of the subjects of the Russian Federation and its digital transformation are carried
out in close cooperation of Russian regions with federal authorities within the framework
of national projects and state programs.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. International Relations;Volume 17; Issue 3

value: digitalization of public administration

value: digital transformation of paradiplomacy

value: digital diaspora of compatriots

value: international activity of federal subjects

value: interaction between the federal center and regions

dc.type

value: Article


title: Kuberpolitik — power in the digital age

dc.contributor.author

value: Grigoryevsky, Valentin V.

dc.identifier.citation

value: Grigoryevsky V. V. Kuberpolitik — power in the digital age. Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 362–381. https://doi.org/10.21638/spbu06.2024.308 (In Russian)

dc.description.abstract

value:
This article explores the role of information and communication technologies (ICT) in
exerting
international influence. The aim is to pinpoint a specific area within the science of
international relations that examines global political processes involving ICT. The author assessed
existing definitions of “cyberpolitics” and highlighted their inadequacy in capturing
the subject under scrutiny. Employing methodologies such as systems theory (including
systems analysis and cybernetics), structural functionalism, neorealism, neoliberalism, as
well as structural analysis, abstraction, and modelling, the author devised a comprehensive
model for analysing cyberpolitics. This model views cyberpolitics as a multidimensional
and multi-level phenomenon with sociotechnical and socioecological subsystems and their
hierarchies, demonstrating their link to social system levels. The article introduces a formula
and function of influence, delineating key variables that determine the nature of influence in
general and in specific cases. All components of technical and technological ICT systems are
described, providing a thorough understanding of their structure and processes. The concept
of “deep technologies” and their potential role in international competition and technological
dependence is explored. The typology of objects and subjects of political relations in this realm
is presented, defining international cyberpolitics as a subset of political science. The term
“comprehensive cyberpolitics” (Kuberpolitik) is proposed. A matrix is developed for evaluating
potential influence models, with an illustrative forecasting example. The article concludes
with recommendations for future research, including detailed matrices for each subject type
and a comprehensive exploration of influence models.

dc.publisher

value: St Petersburg State University

dc.subject

value: cyberpolitics

value: comprehensive cyberpolitics

value: Kuberpolitik

value: “deep technologies”

value: digital age

value: digital economy

value: digitalisation

value: systems analysis

dc.title

value: Kuberpolitik — power in the digital age


dc.contributor.author

value: Bulva, Valeria I.

dc.identifier.citation

value: Bulva V. I. International information security: From classical towards network diplomacy in Russia. Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 325– 341. https://doi.org/10.21638/spbu06.2024.306 (In Russian)

dc.description.abstract

value:
The article examines the formation of a new area of international relations — international information
security, as well as its further division into three tracks — security in the use of ICTs
and ICTs themselves, combating information crime, Internet governance. The author analyzes
the way the model of diplomatic interaction has been transformed based on the example of
cooperation in the above areas. The study shows that international information security, one
of the areas of new threats and challenges, requires the development of network diplomacy
tools as auxiliary elements of classical interstate diplomacy. This format makes it possible to
attract various stakeholders along with states, and a flexible approach to the organizational
structure (the absence of hierarchy) allows one to establish contacts not only with full members,
but also with external partners (Russia-ASEAN, BRICS+ etc.). The Russian Federation
strives to preserve the UN-centric model of cooperation in the field of international information
security, using the platforms created on its initiative — the Open Working Group on
Security in the use of ICTs and ICTs themselves and the UN Ad Hoc Open-ended Committee
on the development of a universal Convention against the use of information and communication
technologies for criminal purposes, as well as the International Telecommunication
Union. At the same time, Russia intensifies cooperation at the regional and transregional level
in order to consolidate the efforts of the world majority, which could ensure the promotion of
Russian initiatives in the international arena aimed at preventing conflicts in the information
space and minimizing the damage from incidents in the use of ICTs.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. International Relations;Volume 17; Issue 3

dc.subject

value: international information security

value: information crime

value: network diplomacy


dc.contributor.author

value: Mazanik, Sergey V.

dc.identifier.citation

value: Mazanik S. V. The European Union’s geopolitical turn and Central Asia as seen from the postcolonial perspective. Part I. Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 276–290. https://doi.org/10.21638/spbu06.2024.303 (In Russian)

dc.description.abstract

value:
The European Union’s geopolitical turn leads to a revision of the bloc’s external action, including
towards Central Asia (CA). Based on a postcolonial approach that views colonization as
a key structuring factor of contemporary international relations, and the method of discourse
analysis, this study consisting of 2 separate publications clarifies how connectivity, which has
become in the context of the geopolitical turn a priority of EU policy in Central Asia, affects
the structure of the EU’s normative hegemony in the region as well as the Central Asian states’
normative agency. To set the stage for postcolonial analysis, Part I of this research traces the
formation of a hierarchical normative structure in the experience of interaction between the
European Union and Central Asian states before the geopolitical turn began. To this end, the
models of EU normative influence central to this study are theorized — normative power
Europe
and resilience, then an analysis is carried out how Brussels, permanently positioning
itself as a normative centre, changed its approach to the transfer of its norms in Central Asia,
and finally, the functioning of the normative hegemony of the European Union is demonstrated,
i. e., a situation in which the EU is recognized by Central Asian actors as an authoritative
source of the normal. Part II of this research first outlines the basic principles of the
postcolonial approach; further, taking into account the dialogic model adopted in postcolonial
studies, an explanation is given of why the colonized is capable of not only submitting to the
normative requirements of the colonizer, but also influencing the latter’s policy; in the final part of the study, the concept of EU connectivity is analyzed and a conclusion is drawn on how
Central Asian states can strengthen their normative agency in relation to Brussels through
participation in European connectivity projects.

dc.description.sponsorship

value:
The study was supported by the Russian Science Foundation grant no. 22-28-00682, https://rscf.ru/
project/22-28-00682/.

dc.publisher

value: St Petersburg State University

value: European Union

value: Central Asia

value: postcolonialism

value: normative power

value: normative hegemony

value: connectivity

value: resilience

value: rules-based order

value: geopolitical turn

dc.type

value: Article


dc.contributor.author

value: Nikolaev, Nikolay A.

dc.identifier.citation

value: Nikolaev N. A. China’s multicomponent self-positioning system in the Arctic: Theory and practice. Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 260–275. https://doi.org/10.21638/spbu06.2024.302 (In Russian)

dc.description.abstract

value:
The article discusses the theory of the development of China’s Arctic Self-Positioning
approaches, as well as the political and diplomatic practice of their implementation in the
Arctic. China’s search for self-identity in the Arctic from the late 2000s to the late 2010s is
developing into a multi-component system of China’s Arctic Self-Positioning, consisting
of six approaches officially applied by Beijing — the Arctic dimension of “a responsible
major country”, “Near-Arctic State”, “an important stakeholder in Arctic affairs”, “an active
participant, builder and contributor”. The complementarity of the strengths of China’s Arctic
Self-Positioning approaches serves as a kind of “a connecting link” of the Multicomponent
System. Thus, while the “Near-Arctic State” Self-Positioning emphasizes China’s special
geostrategic place among non-Arctic States, the “an important stakeholder” approach
emphasizes China’s special role in Arctic affairs. The article analyzes Chinese versions of
positioning approaches borrowed from the West, as well as their substantive differences from
the original versions. The analysis of Chinese expert discourse allowed us to comprehend
the process of formation of the positioning approach from an idea to an officially declared concept implemented within the framework of China’s Foreign Policy. This is relevant in
terms of understanding how China’s Foreign Policy identity is formed in the Xi Jinping era.
The strengths and weaknesses of each of the approaches of China’s positioning in the Arctic
are studied separately. The practice of implementing China’s approaches to positioning in the
Arctic is analyzed, as well as the reactions of the West and the Arctic states. Official documents
and statements on China’s Arctic positioning are analyzed in detail. The content of the expert
version of the positioning approaches is compared with the official interpretation.

dc.language.iso

value: ru

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. International Relations;Volume 17; Issue 3

dc.subject

value: Arctic Self-Positioning

value: “Near-Arctic State”

value: “a responsible major country”


dc.contributor.author

value: Hiep, Tran Xuan

value: Hoan, Truong Quang

value: Kiet, Le Hoang

dc.identifier.citation

value: Hiep T., Hoan T., Kiet H. Free and Open Indo-Pacific strategy: Competitive opinions and trends. Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 242– 259. https://doi.org/10.21638/spbu06.2024.301

dc.description.abstract

value:
The emerging Indo-Pacific regional architecture is now considered to be a key factor in the
fluctuations of world geopolitics and the main site of many power competitions. With its strategic,
economic and commercial importance, the region has become the world’s hotbed of
international confrontation and conflicts in the 21st century. Following a discussion of certain
nations’ perspectives and responses to the free and open Indo-Pacific strategy, the article examines
future cooperation tendencies in the free and open Indo-Pacific strategy, as well as
evaluations of the plan’s impact on the region and the globe. The paper employs qualitative
analysis methods, specifically international relations research methods, historical and logical
methods, as well as comparative methods by surveying secondary data and academic literature
to assess the strategic calculations and responses of the US, China, and India towards the
Indo-Pacific region. The article comes to the conclusion that, with more and more active participation
in the Indo-Pacific regional architecture, regional countries and organizations are
enhancing their position, creating a balance in international relations in the region. The shaping
of the structure of the Indo-Pacific region, as well as the tendency of competition among
countries promises to create a new area of power competition, along with new institutions are
being formed.

dc.language.iso

value: en

dc.publisher

value: St Petersburg State University

dc.subject

value: Indo-Pacific

value: strategy

value: competitive opinion

value: regional structure

value: trends


dc.contributor.author

value: Chernykh, Marina A.

dc.identifier.citation

value: Chernykh M. A. Prospects of J. Biden and D. Trump on the eve of the 2024 presidential election through the lens of Hispanic electorate. Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 291–308. https://doi.org/10.21638/spbu06.2024.304 (In Russian)

dc.description.abstract

value:
The article reveals the definitions of the key terms for this study: “Hispanic” and “Latino”, taking
into account the specifics of Russian and American science. This article provides a portrait
of Hispanic voters on the eve of the 2024 presidential election, identifies their key characteristics,
in particular age, educational attainment, states in which significant shares of their
population live and the growth trend of their electoral activity. A record number of Hispanic
Americans are highly likely to vote in 2024. The article identifies their key issues that directly
influence their political choices. The vast majority is the middle working class, which is concerned
with pressing economic issues rather than the issues of racial and ethnic inequality,
gender equality, protection of sexual minorities, climate change and others that the Democratic
Party has focused on. Moreover, the article reveals the reasons why Biden’s approval rating
has fallen. Among them are the difficult economic situation and illegal immigration crisis
that erupted under his administration, the policy of the 46th president and general trends of Hispanic voters. In addition, the article provides predictions for the 2024 elections through
the lens of their electorate. For the first time in U.S. history, the Republican candidate outperforms
the Democratic candidate in terms of its level of support. Latinos may become the
key group that will return D. Trump to the White House. The likelihood that Biden will again
triumph in a number of swing states through their support is minimal, which significantly
reduces his chances of winning the upcoming elections.

dc.language.iso

value: ru

dc.subject

value: Hispanic voters

value: key issues

value: the 2024 presidential election

value: J. Biden

value: D. Trump

value: swing states

value: Arizona

value: Nevada

value: Georgia

dc.title

value: Article


dc.contributor.author

value: Rekeda, Sergey V.

dc.identifier.citation

value: Rekeda S. V. Heuristic potential of media analysis in the researching of international relations (on the example of regional integration associations). Vestnik of Saint Petersburg University. International Relations, 2024, vol. 17, issue 3, pp. 309–324. https://doi.org/10.21638/spbu06.2024.305 (In Russian)

dc.description.abstract

value:
The analysis presented in the article possesses a methodological essence — it is dedicated to the
evaluation and portrayal of the potential of media analysis in the exploration of international
relations. The need for a comprehensive analysis of the impact of the journalistic community,
social networks, and traditional media on global processes is supported by the concept of
“meditization of society”. Media analysis is suggested as a suitable instrument for addressing
this research objective, a technique predominantly utilized in the corporate realm — in
fields such as marketing and public relations — to ascertain the positioning of a specific brand
within the information domain. The primary goal of the article is to conceptualize the successful
practical application of studying the media portrayal of the Eurasian Economic Union
(EAEU) through the methodology of media analysis for the examination of other components
of worldwide relations. In pursuit of this aim, the article presents an original definition of
media analysis within international relations, a variety of global relations themes that can be
explored through the medium of media analysis, a compilation of essential elements of media
activity crucial in the examination of worldwide relations utilizing media analysis, and a systematic
procedure for implementing media analysis in the study of international relations.
The efficacy of media analysis is exemplified through the case study of the “Eurasian Media Index”
research project, conducted by the author of the article from 2017 to 2021 — the project’s
objective was to analyze the media portrayal of the Eurasian Economic Union over a period of
time. Drawing from this experience, the article provides insights into the potential of employing
such a supplementary method for the examination of alternative facets of global politics.
Noteworthy applications of media analysis within international relations include monitoring
media patterns that mirror political shifts; managing information flows to mitigate political
vulnerabilities in cross-border relations; promptly addressing emerging media challenges; delineating
a thorough media representation of an international entity or process to devise an
apt communication strategy; and evaluating the impact of global developments on the perception
and image of an international entity or process.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. International Relations;Volume 17; Issue 3

dc.subject

value: Mediatization

value: mass-media

value: social networks

value: Eurasian media-index

value: international relations

value: Eurasian Economic Union

value: regional integration associations

value: international organizations


title: ЭКСПЕРТНОЕ ЗАКЛЮЧЕНИЕ по информационным материалам запроса ГУ МВД России по г. Санкт-Петербургу и Ленинградской области (Отдельные фрагменты исключены из текста опубликованного заключения в целях обеспечения соблюдения требований законодательства)

dc.description.abstract

value: Abstract

dc.language.iso

value: ru

value: госорганы

value: МВД России

value: информационный материал

value: призыв к враждебным (насильственным) действиям

value: унижение достоинства человека

value: по принакам расы, национальности, религиозности

value: признаки возбуждения розни

value: принадлежность к социальной группе

dc.type

value: Other


dc.subject

value: информационный материал

value: признаки возбуждения розни (вражды, ненависти)

value: унижение чести и достоинства

value: национальность

dc.title

value: ЭКСПЕРТНОЕ ЗАКЛЮЧЕНИЕ по информационным материалам запроса ГУ МВД России по г. Санкт-Петербургу и Ленинградской области (Отдельные фрагменты исключены из текста опубликованного заключения в целях обеспечения соблюдения требований законодательства)


dc.description

value: Отдельные фрагменты исключены из текста опубликованного заключения в целях обеспечения соблюдения требований законодательства

dc.subject

value: информационный материал

value: признаки побуждения к действиям против какой-либо группы, выделенной по национальному, религиозному, социальному  признаку

value: возбуждение розни по отношению к группе лиц


value: призыв к осуществлению деятельности, направленной на нарушение территориальной целостности


title: Интервью с И.С. Дмитриевым 19.08.2024

dc.contributor.author

value: Крутько Ксения Игоревна

dc.description

value: Запись интервью с И.С. Дмитриевым. 19.08.2024.

value: Музей-архив Менделеева, химфак, Химтическое общество

dc.title

value: Интервью с И.С. Дмитриевым 19.08.2024

dc.type

value: Recording, oral

filename: И.С. Дмитриев. Интервью 19.08.2024.MP3

format: Unknown

filename: Интервью с И.С. Дмитриевым транскрибированное (1).docx

format: Microsoft Word XML

filename: Интервью с И.С. Дмитриев 19.08.2024 (текст, таблица, опросник).docx

description: Обновленный файл (опросник, таблица, текст)


title: Интервью с А.В. Богдановым

dc.contributor.author

value: Мамаюсупова, Парвина

dc.description.abstract

value: Интервью с А.В. Богдановым

dc.title

value: Интервью с А.В. Богдановым

filename: Интервью с А.В. Богдановым.MP3

filename: Богданов А.В._Интервью_14.08.2024.docx


title: К вопросу о написании программного документа “Об искусственном интеллекте в высшем образовании”

dc.contributor.author

value: Архипов, Владислав Владимирович

value: Наумов, Виктор Борисович

dc.description.abstract

value: Данный материал представляет собой первую ("черновую") редакцию статьи и нацелен на формулировку общих представлений об использовании искусственного интеллекта (далее – ИИ) в образовательной деятельности, сформулированных с точки зрения Санкт-Петербургского государственного университета. Технологии ИИ развиваются стремительно, но не менее стремительно развиваются и способы их применения – как добросовестного, так и недобросовестного. Задача данных рассуждений заключается не в формулировке казуистичных правил, а в выражении общих принципов в связи с историей и контекстом деятельности Университета. Основным принципом является не «кодификация», а приведение достаточного количества репрезентативных примеров, явно свидетельствующих о возможной позиции по вопросу ИИ. Документ посвящен только этическим вопросам и не затрагивает общие юридические вопросы (например, из области персональных данных или авторского права).

filename: (Архипов, Наумов) СПбГУ Об ИИ в образовании. Проект для обсуждения 08_08_2024.pdf


title: Интервью с Л.Н. Поляковой

dc.contributor.author

value: Мамаюсупова, Парвина

value: Интервью с Л.Н. Поляковой

dc.title

value: Интервью с Л.Н. Поляковой

filename: Интервью Полякова Л.Н. .MP3

filename: Полякова Л.Н._Интервью_06.08.2024.docx


dc.contributor.author

value: Lyakhova, Ulyana A.

value: Lyakhov, Pavel A.

dc.identifier.citation

value: Lyakhova U. А., Lyakhov P. А. Multimodal ensemble neural network system for skin cancer detection on heterogeneous dermatological data. Vestnik of Saint Petersburg University. Applied Mathematics. Computer Science. Control Processes, 2024, vol. 20, iss. 2, pp. 231–243. https://doi.org/10.21638/spbu10.2024.208 (In Russian)

dc.description.abstract

value:
Today, skin cancer is one of the leading causes of death in the world. Diagnosing skin cancer
early is critical to increasing potential survival. Therefore, it is relevant to develop highprecision
intelligent auxiliary diagnostic systems for detecting skin cancer in the early stages.
Ensemble learning is one of the current and promising methods for increasing the accuracy
of intelligent classification systems by reducing the dispersion and variability of predictions
of individual components of the overall system. The work proposes an ensemble intelligent
system for analyzing heterogeneous dermatological data based on multimodal neural networks.
The accuracy of the developed ensemble system was 85.92%, which is 1.85 percentage
points higher than the average accuracy of individual multimodal architectures for classifying
heterogeneous dermatological data. The developed system can be used as a high-precision
auxiliary diagnostic tool to help make a medical decision, which will increase the chance of
early detection of pigmented oncological pathologies.

dc.description.sponsorship

value:
The research in section 2 was supported in the North-Caucasus Center for Mathematical Research
under an agreement with the Ministry of Science and Higher Education of the Russian Federation
(agreement N 075-02-2024-1451), the research in section 3 was supported by the Russian Science
Foundation, project N 23-71-10013 (https://rscf.ru/project/23-71-10013/). The authors thank the North-
Caucasus Federal University for assistance within the framework of the project to support small scientific
groups and individual scientists.

dc.publisher

value: St Petersburg State University

dc.relation.ispartofseries

value: Vestnik of St Petersburg University. Applied Mathematics. Computer Science. Control Processes;Volume 20; Issue 2

dc.subject

value: multimodal neural network

value: ensemble neural network

value: machine learning

value: heterogeneous data

value: dermatological images

value: pigmented skin lesions

value: skin cancer

value: melanoma

dc.type

value: Article


dc.description.abstract

value: Abstract

dc.language.iso

value: ru

dc.subject

value: госорганы

value: МВД России

value: информационный материал

value: дни воинской славы

value: неуважение к обществу

value: осквернение символов воинской славы

value: оскорбление памяти защитников

value: Отечество

dc.title

value: ЭКСПЕРТНОЕ ЗАКЛЮЧЕНИЕ по информационным материалам запроса ГУ МВД России по г. Санкт-Петербургу и Ленинградской области (Отдельные фрагменты исключены из текста опубликованного заключения в целях обеспечения соблюдения требований законодательства)

value: Other


title: Интервью с А.В. Пантелеевым. 01.07.2024

dc.contributor.author

value: Крутько, Ксения Игоревна

dc.description.abstract

value: Интервью с А.В. Пантелеевым. 01.07.2024

value: Интервью с А.В. Пантелеевым. 01.07.2024

filename: Интервью с Пантелеевым А.В. 01.07.2024.m4a

format: MPEG

description: Интервью с А.В. Пантелеевым. Часть 1. 01.07.2024

filename: Интервью с Пантелеевым А.В. Часть 2.m4a

description: Интервью с А.В. Пантелеевым. Часть 2. 01.07.2024

filename: Транскрибированное интервью с А.В. Пантелеевым 01.07.2024

format: Word

description: Транскрибированное интервью с А.В.Пантелеевым 01.07.2024

filename: Интервью с А.В. Пантелеевым 01.07.2024 (текст, опросник, таблица).docx

filename: mix_60m24s (audio-joiner.com).mp3


title: Интервью с Н.В. Смирновым 27.06.2024

dc.contributor.author

value: Мамаюсупова, Парвина

value: Интервью с Н.В. Смирновым 27.06.2024

dc.title

value: Интервью с Н.В. Смирновым 27.06.2024

dc.title.alternative

value: Интервью с Н.В. Смирновым 27.06.2024

dc.type

value: Recording, oral

filename: Смирнов Н.В._Интервью_127.06.2024.docx


title: Интервью с А.Я. Колесниковым

dc.contributor.author

value: Роганина, Марина

dc.description.abstract

value: Интервью с А.Я. Колесниковым

dc.title

value: Интервью с А.Я. Колесниковым

filename: Интервью с А.Я. Колесниковым.MP3


dc.contributor.author

value: Strelkov, Petr

dc.description

value: Individual data for Clupea herring from the Rossfjordvatn herring survey. Microsatellite genotypes and allozyme genotypes are given in GenAlEx format.

dc.description.abstract

value: Individual data for Clupea herring from the Rossfjordvatn herring survey. Microsatellite genotypes, allozyme genotypes, NCBI mtDNA cyt-b numbers and number of vertebrae of the surveyed fish are provided on different sheets of the Exel file. Samples included: CP (Chesha Bay, Yarnei River, at spawning grounds, 67.780000 N, 45.990000 E, June 2010); WS (White Sea, Kandalaksha Bay, Keret archipelago, 66.283333 N, 33.600000 E, June 2015); BF (Balsfjord, at spawning grounds, 69.270000 N, 19.280000 E, 07.04.2010); RF (Rossfjordvatn, October 2014); TF (Trondheimsfjord, Beitstadfjord, at spawning grounds, 63.972700 N, 11.303600 E, 04.04.2016); NO (Norwegian Sea, Kvænangen, 70.102500 N, 21.183333 E, 18.01.2019).

dc.description.sponsorship

value: The study was supported by the Russian Science Foundation, Grant Number 19-74-20024

dc.language.iso

value: en

dc.subject

value: Clupea

value: Microsatellites

value: Allozymes

value: Number of vertebrae

value: cyt-b mtDNA NCBI numbers

dc.type

value: Dataset

filename: Individual data for Clupea herring from the Rossfjordvatn herring survey_online.xlsx

format: Microsoft Excel XML


title: Influence of Natural Tropical Oscillations on Ozone Content and Meridional Circulation in the Boreal Winter Stratosphere

dc.contributor.author

value: Ermakova, Tatiana

value: Koval, Andrey

value: Didenko, Kseniia

value: Aniskina, Olga

value: Okulicheva, Arina

dc.description.abstract

value: The dependence of ozone content in the polar stratosphere upon different phases of the quasi-biennial oscillation (QBO) of the zonal wind and the El Niño–Southern Oscillation (ENSO) during winter was studied. The monthly (from November to January) mean residual meridional circulation (RMC) was calculated for four different combinations of the main phases of ENSO and QBO using MERRA2 reanalysis data. It has been demonstrated that the QBO phase manifests itself in different vertical distributions of ozone in the equatorial stratosphere, as well as in strengthening/weakening of the secondary meridional circulation in the tropics. The enhancement of the RMC from the tropical to the polar stratosphere is stronger at altitudes where ozone is higher in the tropics under El Niño conditions. The RMC modification and intensification are observed from ozone-depleted areas under La Niña conditions. A “cumulative” effect is observed by February under La Niña conditions and the easterly QBO, which is expressed in the lowest ozone content in the polar stratosphere. The numerical experiments carried out using the Middle and Upper Atmosphere Model (MUAM) confirmed tendencies in changes in the meridional transport detected from the reanalysis data for different combinations of QBO and ENSO.

dc.publisher

value: MDPI Atmosphere

dc.title

value: Article


title: Интервью с Т.Л. Никольской

dc.contributor.author

value: Мамаюсупова, Парвина

dc.description.abstract

value: Интервью с Т.Л. Никольской

value: Интервью с Т.Л. Никольской

dc.type

value: Recording, oral

filename: интервью Никольская.MP3

filename: Никольская Т.Л._Интервью_05.06.2024.docx


dc.contributor.author

value: Isakov, Andrey A.

value: Gorikhovskii, Viacheslav I.

value: Melnik, Maksim Yu.

dc.identifier.citation

value: Isakov A.A., Gorikhovskii V. I., Melnik M.Yu. Regression models for calculating state-to-state coefficients of the rate of vibrational energy exchanges. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 332–346. https://doi.org/10.21638/spbu01.2024.207 (In Russian)

dc.description.abstract

value:
The paper proposes an effective algorithm for solving problems of nonequilibrium gas
dynamics taking into account detailed state-to-state vibrational kinetics. One of the
problems of traditional methods is their high computational complexity, which requires
a lot of time and memory. The work explored the possibilities of using relaxation rate
prediction to improve the performance of numerical simulations of nonequilibrium oxygen
flows instead of direct calculations. For this purpose, an approach based on nonlinear
regression analysis was used, which made it possible to obtain computationally efficient
approximation formulas for the energy exchange rate coefficients in the model of a forced
harmonic oscillator, taking into account free rotations (FHO-FR), to significantly increase
the calculation speed while maintaining accuracy, and to construct an optimized model
FHO-FR-reg. Using the obtained regression formulas, numerical modeling was carried out,
which made it possible to validate the model for the problem of oxygen flow behind an
incident and reflected shock wave. A comparison between the forced harmonic oscillator
(FHO) and FHO-FR models is not possible due to the high computational complexity of the second model. With the advent of a common approximation model, it became possible
to compare simulation results for these models. Numerical calculations have shown that
the FHO-FR-reg model gives values of gas-dynamic parameters close to the FHO model.
The developed regression models make it possible to speed up the solution of the problem
of modeling oxygen relaxation several times compared to other models of similar accuracy.

dc.description.sponsorship

value:
The research by A. A. Isakov and V. I. Gorikhovskii was carried out with the financial support
of St. Petersburg State University (project ID 94034084), by M. Yu.Melnik — with the support of
Theoretical Physics and Mathematics Advancement Foundation «BASIS» (grant no. 22-1-1-17-3).

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 11 (69); Issue 2

dc.subject

value: vibrational relaxation

value: state-to-state kinetics

value: shock wave

value: optimization of numerical calculations

value: nonlinear regression

value: machine learning


dc.contributor.author

value: Smirnov, Alexey S.

value: Kravchinskiy, Igor A.

dc.identifier.citation

value: Smirnov A. S., Kravchinskiy I. A. Dynamics of a double pendulum with viscous friction in the joints. I. Mathematical model of motion and construction of the regime diagram. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 371–384. https://doi.org/10.21638/spbu01.2024.210 (In Russian)

dc.description.abstract

value:
The paper discusses the dynamic behavior of a double mathematical pendulum with
identical parameters of links and end loads, which is under the influence of viscous friction
in both of its joints with generally different dissipative coefficients. A linear mathematical
model of the system motion for small deviations is given, and a characteristic equation containing two dimensionless dissipative parameters is derived. For the case of low damping,
approximate analytical expressions are found that make it possible to evaluate and compare
with each other the damping factors during the motion of the system on each of the
oscillation modes. A diagram of dissipative motion regimes is constructed, which arises
when the plane of dimensionless parameters is divided by discriminant curves into regions
with a qualitatively different character of the system motion. It is noted that a dissipative
internal resonance can take place in the system under consideration, and the conditions for
its existence in an analytical form are established, as well as their graphic illustration is
also given. This article is the first part of the study of the dynamics of a dissipative double
pendulum, the continuation of which will be presented as a separate work “Dynamics of a
double pendulum with viscous friction in the joints. II. Dissipative oscillation modes and
optimization of damping parameters”.

dc.subject

value: double pendulum

value: viscous damping

value: low friction

value: damping factor

value: discriminant curve

value: dissipative regime diagram

value: dissipative internal resonance

dc.title

value: Article


title: Session of Prof. N.N.Polyakhov theoretical mechanics section of the M. Gorky House. October 4, 2023

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 11 (69); Issue 2


dc.contributor.author

value: Begun, Nikita A.

value: Vasil’eva, Ekaterina V.

value: Zvyagintseva, Tatiana E.

value: Iljin, Yurii A.

dc.identifier.citation

value: Begun N.A., Vasil’eva E.V., Zvyagintseva T. E., Iljin Yu.A. Review of the research on the qualitative theory of differential equations at St.Petersburg University. I. Stable periodic points of diffeomorphisms with homoclinic points, systems with weakly hyperbolic invariant sets. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 211–227. https://doi.org/10.21638/spbu01.2024.201 (In Russian)

dc.description.abstract

value: This paper is the first in a series of review publications devoted to the results of scientific research work that has been carried out at the Department of Differential Equations of St. Petersburg University over the past 30 years. Current scientific interests of the department staff can be divided into the following directions and topics: study of stable periodic points of diffeomorphisms with homoclinic points, study of systems with weakly hyperbolic invariant sets, local qualitative theory of essentially nonlinear systems, classification of phase portraits of a family of cubic systems, stability conditions for systems with hysteretic nonlinearities and systems with nonlinearities under the generalized Routh- Hurwitz conditions (Aizerman problem). This paper presents recent results on the first two topics outlined above. The study of stable periodic points of diffeomorphisms with homoclinic points was carried out under the assumption that the stable and unstable manifolds of the hyperbolic points are tangent at a homoclinic (heteroclinic) point, and the homoclinic (heteroclinic) point is not a point with a finite order of tangency. The research of systems with weakly hyperbolic invariant sets was conducted for the case when neutral, stable, and unstable linear spaces do not satisfy the Lipschitz condition.

dc.subject

value: non-transversal homoclinic point and trajectory

value: heteroclinic contour

value: stability

value: hyperbolicity

value: attractor

value: weakly hyperbolic invariant set


dc.contributor.author

value: Lebedeva, Anastasia V.

value: Ryabov, Victor M.

dc.identifier.citation

value: Lebedeva A. V., Ryabov V.M. Determination of breakpoints and the magnitude of the jump of the original according to its Laplace image. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 316–323. https://doi.org/10.21638/spbu01.2024.205 (In Russian)

dc.description.abstract

value:
The application of the integral Laplace transform for a wide class of problems leads to
a simpler equation for the image of the desired original. At the next step, the inversion
problem arises, i. e., finding the original by its image. As a rule, it is not possible to carry
out this step analytically. The problem arises of using approximate inversion methods. In
this case, the approximate solution is represented as a linear combination of the image and its derivatives at a number of points of the complex half-plane in which the image is
regular. However, the original, unlike the image, may even have break points. Of undoubted
interest is the task of developing methods for determining the possible break points of the
original and the magnitude of the original jump at these points. The proposed methods
use the values of high-order image derivatives in order to obtain a satisfactory accuracy
of approximate solutions. Methods for accelerating the convergence of the obtained approximations
are indicated. The results of numerical experiments illustrating the effectiveness
of the proposed methods are presented.

dc.description.sponsorship

value:
This paper was prepared with the support by a grant from St. Petersburg State University “Event 3”
(Pure ID 75207094).

dc.subject

value: Laplace integral transform

value: inversion problem

value: original discontinuity points

value: original jump


dc.contributor.author

value: Kuleshov, Alexander S.

value: Shishkov, Alexander A.

dc.identifier.citation

value: Kuleshov A. S., Shishkov A.A. Integrability by quadratures of the problem of rolling motion of a heavy homogeneous ball on a surface of revolution of the second order. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 347–353. https://doi.org/10.21638/spbu01.2024.208 (In Russian)

dc.description.abstract

value:
In this paper, we consider the problem of rolling of a heavy homogeneous ball on a perfectly
rough surface of revolution. Usually, when considering this problem, it is convenient to
specify explicitly the surface along which the center of the ball moves during rolling, instead
of the surface along which the ball rolls. The surface on which the center of the ball moves is
equidistant to the surface on which the ball is rolling. It is well known, that the considered
problem is reduced to the integration the second order linear homogeneous differential
equation. In this paper we assume, that the surface along which the center of the ball
moves is a non — degenerate surface of revolution of the second order. Using the Kovacic
algorithm we prove that the general solution of the corresponding linear differential equation
can be found explicitly. This means, that in this case the problem of rolling of a ball on a
surface of revolution can be integrated by quadratures.

dc.description.sponsorship

value: This work is supported by Russian Science Foundation (project no.RAI-RSF-2490).

dc.language.iso

value: ru

dc.publisher

value: St Petersburg State University

value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 11 (69); Issue 2

dc.subject

value: rolling without sliding

value: homogeneous ball

value: surface of revolution of the 2nd order

value: integrability by quadratures

dc.type

value: Article


dc.contributor.author

value: Mir, Mohammad Yu.

value: Wali, Shah L.

value: Shah, Wali M.

dc.identifier.citation

value: Mir M.Y., Wali S. L., Shah W.M. Extremal problems of Tur´an-type involving the location of all zeros of a class of rational functions. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 324–331. https://doi.org/10.21638/spbu01.2024.206 (In Russian)

dc.description.abstract

value:
In this paper, we prove a Tur´an-type inequality for rational functions and thereby extend
it to a more general class of rational functions r(s(z)) of degree mn with prescribed poles,
where s(z) is a polynomial of degree m. These results not only generalize some Tur´antype
inequalities for rational functions, but also improve as well as generalize some known
polynomial inequalities.

dc.description.sponsorship

value: M.Y.Mir expresses his deep gratitude to the DST-INSPIRE agency for financial support.

dc.subject

value: rational function

value: polynomials

value: zeros

value: polar derivative

value: inequalities


title: In memoriam of Lev Meerovich Bregman (1941–2023)

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 11 (69); Issue 2


dc.contributor.author

value: Tikhonov, Аlexey А.

dc.identifier.citation

value: Tikhonov А.А. Rigid body dynamics from the Euler equations to the spacecraft attitude control in the works of scientists from Saint Petersburg State University. Part 2. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 259–302. https://doi.org/10.21638/spbu01.2024.203 (In Russian)

dc.description.abstract

value:
This article represents the second part of a survey dedicated to the 300th anniversary of
Saint Petersburg State University (SPbSU). The article is intended on analysis the scientific
achievements of the Saint Petersburg School of Mathematics and Mechanics in the field of
rigid body dynamics in the last 50 years. The main attention in the article is paid to
theoretical research in the field of uncontrolled and controlled motions of a rigid body.

dc.subject

value: rigid body

value: spacecraft

value: artificial Earth satellite

value: dynamics

value: attitude motion

value: attitude control

value: stabilization

value: oscillations


dc.contributor.author

value: Prokopjeva, Marina S.

value: Krayani, Hussein A.

value: Il’in, Vladimir B.

dc.identifier.citation

value: Prokopjeva M. S., Krayani H.A., Il’in V. B. Astronomical researches at the mathematical faculty of the St.Petersburg University. I. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2024, vol. 11 (69), issue 2, pp. 228–258. https://doi.org/10.21638/spbu01.2024.202 (In Russian)

dc.description.abstract

value: The progress of astronomical researches performed within the St. Petersburg University since its foundation is reviewed. The topics of the works of University astronomers in the 18th -19th centuries are brie y described and their main achievements are highlighted. The most important studies made in various fields of astronomy in the University in 20th century are outlined. An accent is made on the mathematical aspects.

dc.subject

value: mathematics applications in astronomy

dc.type

value: Article