Saint Petersburg Mining University
  • Saint Petersburg, Russia
Recent publications
  • S. Bosonogov
    S. Bosonogov
  • A. Suvorova
    A. Suvorova
In this work we analyze comments on three subreddits related to AI-generated art to understand how people perceive the ability of AI to create art and the topics and moods of discussions in the context of widespread usage of pre-trained models. We used computational text analysis techniques such as LDA topic modeling and sentiment analysis with sentiment lexicons. As a result, we find that discussions on technical topics and descriptions of AI-generated art were mainly positive, while discussions on socio-cultural issues were mainly negative and took place in a subreddit focused on defending AI art. The findings suggest that Reddit users are interested in both the artistic and socio-cultural implications of AI-generated art, finding it risky and questionable.
Five distinct generational cohorts, from the Silent Generation (born 1920s-1940s) to Generation Z (born 1996-2010s), are active in the workforce. These cohorts are defined by shared characteristics shaped by pivotal historical events influencing their worldviews and work behaviors. Each generation presents unique challenges due to differing values, expectations, and workplace norms. Effective organizational leaders must adeptly navigate these intergenerational dynamics. This paper (1) delineates the distinct characteristics, values, and motivations of each generational cohort; (2) conceptualizes situational and inclusive leadership approaches as preferred styles of leading a multi-generational workforce; and (3) suggests the Integrated Situational and Inclusive Leadership Framework that provides insights and actionable strategies for adaptive leadership that meet the diverse needs of these generational groups.
An experimental investigation was carried out to assess the impact of manufacturing technologies on the fracture mechanisms and fatigue mechanical properties of drill pipe N (in its normalized state) and pipe U (following improvement) under cyclic loads. Two strength groups of drill pipe, N and U, were subjected to study. The presence of a highly tempered fine-dispersed structure in the material of pipe U, in comparison to the ferrite-perlite structure of the material of pipe N, provides enhanced resistance to fatigue crack initiation. This is confirmed by the values of the endurance limits, which are 503 MPa for pipe U and 294 MPa for pipe N. The fatigue tests carried out in the air revealed an inflection in the fatigue curves. For the metal of drill pipe N, the inflection corresponds to a value of 343 MPa, while for the metal of pipe U, it corresponds to a value of 522 MPa. Such inflection is associated with the formation of a barrier in the form of a hardened surface layer that arises during testing.
This article discusses the option of upgrading an ore-thermal furnace to produce technical silicon by installing strain gage sensors with signal converters and a rangefinder in the electrode lifting system. This upgrade will enable the reception of real-time data on changes in mass (carbon monoxide) or electrode breakage and the position of the working end of the electrode. The latter parameter is associated with the position of the reaction zone in the furnace, which directly affects the specific amount of electricity consumption, the temperature and volume of silicon leaving the furnace, and heat losses and dust removal with exhaust gases. The upgrade will increase the observability of the control object, which will improve the quality of control of the technological process of carbothermic silicon reduction.
The review of the monograph by Inna Evgenievna Barykina, Doctor of Historical Sciences, under the title "A Typical St. Petersburg Officialو Count Dmitry Andreevich Tolstoy (1823-1889): the Experience of the Minister Biography" focuses on the characterization of D.A. Tolstoy as a researcher of Catholicism in Russia. It is noted that the monograph author is by no means inclined to exaggerate Count Tolstoy's contribution to the Catholicism historiography, however, his work served a valuable help to both the count's contemporaries and the 21st century scientists. I.E. Barykina convincingly showed that in all his positions, count D.A. Tolstoy proved himself not only as a statesman, but also as an intellectual and a historian who laid the foundations for studying the Catholicism history in Russia.
Organization of political and educational work in extreme and special conditions of service is a complex and responsible process. Understanding the importance of this activity and the effective use of appropriate methods and tools are an integral part of ensuring national security and stability in society. This article examines the most pressing problems facing the law enforcement system and arising in the constantly improving realities associated with the emergence of special conditions of service and the possibility of conducting political and educational work in these conditions. The article also touches upon the issue and problems of the lack of methods for conducting political and educational work with personnel in special conditions, as well as issues of legal consolidation of some mechanisms for working in these conditions. The issue of the significance of special and extreme conditions, which to this day remain unfixed in the conceptual and categorical apparatus of the legislator, is considered. The object of the study is the process of organizing political and educational work with personnel in special conditions. The subject of this study will be the content and methods with the help and on the basis of which the methodology for conducting political and educational work is formed. The purpose of examining this issue will be to analyze the practice of applying political and educational work in the Russian Federation's Internal Affairs Bodies in order to identify its current problems, effective methods and areas for improvement by developing a memo on organizing political and educational work with the personnel of the Internal Affairs Bodies in special service conditions.
In firefighting and rescue operations, practical training plays a primary role, allowing rescuers to be constantly ready to act in the event of major incidents, accidents or emergencies. In addition to classical training methods, namely training in an unsuitable environment for breathing. Virtual reality is increasingly being used in training in many fields of activity, given the fact that in a virtual environment it is easy to simulate dangers that cannot be created in reality (explosions, fires, falls from a great height), and thus overcome the fear of such dangers. The capabilities of virtual reality simulators allow you to create training scenarios that emphasize the degree of physical fitness of rescuers, taking into account their physiological parameters, which are monitored throughout the training.
This study focuses on the opecoelid genus Podocotyle, particularly the species in the northern European seas (White, Barents and Pechora), with additional data from few isolates from the Far East. The research combines molecular analyses (28S, 5.8S+ITS2 rDNA, and cox1 mtDNA) and morphological examinations. Molecular analyses suggested that there are most likely four species of Podocotyle in the northern European seas and three more in the Far East. Morphological redescriptions are provided for three northern European species: P. atomon, P. reflexa, and P. odhneri, with the latter recognized as a valid species. The study also verified the life cycle of P. atomon and identified Lacuna vincta (Littorinidae) as the first intermediate host for P. reflexa. In the Sea of Okhotsk, L. turrita is the first intermediate host for two apparently undescribed Podocotyle species. The results also highlight the morphological variability of P. atomon, emphasizing the need for an integrative approach in the taxonomy and biodiversity studies.
This work is devoted to the study of a fast non-relativistic electron beam–gas discharge plasma system within the framework of the kinetic theory of stability. The influence of a constant electric field, collinear beam velocity, on the stability of the system in an undisturbed plasma is studied. It is shown that even a relatively small electric field, which does not significantly affect the energy of the electron beam, can lead to significant changes in the parameters of harmonic disturbances propagating in the electron beam–plasma system in the region of its instability. It was found that the reason for such changes is the drift of plasma electrons, which, as a consequence, leads to a change in the frequency of disturbances in the coordinate system associated with the plasma due to the Doppler effect. The results obtained are demonstrated by calculations based on the kinetic theory of perturbation parameters in a low-voltage beam discharge in rare gases, which is used in the development of plasma electronics devices. The effect of electron-atomic collisions on the stability of the electron beam–plasma system is investigated and compared with the results of other authors' works.
Determination of plan view coordinates and working benchmarks heights on a landslide by linear-angular measurements using electronic total stations by the polar notching method and trigonometric levelling involves installing a prism reflector on a tripod or a pole plumb above the observed benchmark. In order to put it in the mentioned position, round levels are used, its accuracy affects precise determining the plan view coordinates and the benchmark heights. Direct visibility from the reference benchmark to the working one may be lost due to landslide displacements, reappeared vegetation or other obstacles. These circumstances may cause incomplete or distorted interpretation of the landslide hazard forecast during cyclic multi-year observations. The authors propose a new method of determining the plan view coordinates and height of the working benchmark on a landslide by linear-angular measurements on a pole with a prism reflector with its forced inclinations from the plumb position. The required data is calculated as the said parameters of the sphere center, which is constructed by approximation of those of the prism reflector node point obtained by tilting the pole. A number of experiments were carried out to confirm the performance of the method in geodetic landslide observations and its suitability for use in cases of visibility loss to the benchmark at the plumb position of the pole
The finds of giant CLIPPIR-type diamonds in the placers hosted by the Ebelyakh River basin in the north of Yakutia suggest that similar diamonds can be found in the kimberlites of the Anabar region and the nearest northern deposits located within the collisional Khapchan and Daldyn terranes. To predict the discovery of such diamonds, the authors use the 5E diagram method based on the principle of similarity of the compositions of five oxides of satellite minerals (Grt, Cpx, Chr and Ilm) of diamond (DSM) with the reference diagrams for the Karowe pipe (K-6, Botswana) with the composition of those for any other pipe. It was previously shown that the convergence of the DSM compositions of the Karowe and V. Grib (Arkhangelsk diamond province) pipes is 74 %, which might indicate possible presence of CLIPPIR diamonds in the predicted pipe. The application of this technique to two kimberlite pipes of the Anabar region demonstrated that the probability of detecting such diamonds in the Leningrad pipe (Lower Devonian, medium diamond content potential) is 74 %, and in the Malokuonamskaya pipe (Lower Triassic, medium diamond content) is 20 %. A comparison of diagrams 5E and additional PTС – fO2 diagrams of reconstructed sections of the lithospheric mantle showed their efficiency in predicting favorable conditions of CLIPPIR-type diamond crystallization. It is assumed that formation of such diamonds may occur within the proto-kimberlite magmatic chamber located near the boundary of the lithosphere and associated with the asthenospheric source. It should be surrounded by low-oxidized carbon-rich mantle eclogites and dunites with high pressure and temperature, as well as magnesium-rich ilmenite-chromite metasomatites. The use of the 5E diagram method, as the approach to predict giant CLIPPIR diamonds in poorly diamondiferous kimberlites, might attract investing for exploration to audit the industrial potential of a series of such kimberlites in the Anabar region. Its implementation would significantly increase the efficiency of geological exploration and assessment of the potential of poorly diamondiferous pipes that have been suspended as subeconomic.
The present bias is a well-documented behavioral trait that significantly influences human decision-making, with present-biased agents often prioritizing immediate rewards over long-term benefits, leading to suboptimal outcomes in various real-world scenarios. Kleinberg and Oren (2014) proposed a popular graph-theoretical model of inconsistent planning to capture the behavior of present-biased agents. In this model, a multi-step project is represented by a weighted directed acyclic task graph, where the agent traverses the graph based on present-biased preferences. We use the model of Kleinberg and Oren to address the principal-agent problem, where a principal, fully aware of the agent’s present bias, aims to modify an existing project by adding or deleting tasks. The challenge is to create a modified project that satisfies two somewhat contradictory conditions. On one hand, the present-biased agent should select specific tasks deemed important by the principal. On the other hand, if the anticipated costs in the modified project become too high for the agent, there is a risk of the agent abandoning the entire project, which is not in the principal’s interest. To tackle this issue, we leverage the tools of parameterized complexity to investigate whether the principal’s strategy can be efficiently identified. We provide algorithms and complexity bounds for this problem.
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2,468 members
Ekaterina Samylovskaya
  • Department of History
Sergey Tsirel
  • Geomechanics center
Alexander Tatarenko
  • Department of Electrical and Electronics Engineering
Yuri Gulbin
  • Deparment of mineralogy, crystallography and petrography
Igor Albertovich Brigadnov
  • Information Systems and Computer Sciences
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Saint Petersburg, Russia
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Vladimir Litvinenko