bluuebunny/crossref_metadata_2025 huggingface dataset:
Geochronology of Detrital Zircons from Ordovician–Devonian Sediments of the South Qinling Belt: Implications for the Closure of the Shangdan Ocean
Authors: Luo Fenhong , Gong Hujun , Liu Hang , Zhang Yaqin
Published: October 2024

The Shangdan suture zone preserves important information regarding the Paleozoic collision between the North China Block and South China Block (SCB). Though the timing of this collision significantly affected the tectonic evolution of the Qinling Orogenic Belt, it remains controversial. Detailed U–Pb dating of detrital zircons from Ordovician to Devonian sediments in the South Qinling Belt (SQB) revealed age clusters of 430–450, 710–840, and 910–960 Ma for Devonian and Silurian detrital zircons samples (~ 440, 800, and 940 Ma peaks, respectively). Ordovician samples were mainly 710–850 Ma (peak at ~ 735 Ma) and lacked the 910–960 Ma age group. Comparing magmatic events with those from surrounding terranes and detrital zircon mixing provenance modeling revealed 430–450 and 910–960 Ma peaks for granitoids in the North Qinling Belt; the 710–840 Ma age population was related to the SCB and SQB. Devonian and Silurian samples indicated provenances from northern and southern sides of the Shangdan suture zone. Ordovician samples were from the southern side, suggesting significant provenance conversion in SQB strata from Ordovician to Silurian. Closure of the Shangdan Ocean probably occurred during the Ordovician to Silurian period, imparting a northern provenance to Silurian and Devonian strata.
Modeling the COVID-19 incorporating oil futures
Authors: Alghalith Moawia , Floros Christos , Daglis Theodoros , Gkillas Konstantinos
Published: October 2024

The COVID-19 pandemic necessitated the production of mathematical models that were able to explain and thoroughly study various aspects and features of the pandemic. In this work, we provide a well-stated mathematical model to explain and simulate the evolution of the COVID-19 pandemic. To test our model’s performance and validity, we utilize actual surveillance data from the pandemic, capturing the results of this empirical investigation. According to the results, our model is valid, since all estimates are statistically significant, and the coefficient explains the evolution of the pandemic.
Taming collective activity to crystallize an oscillator gas
Authors: Morin Alexandre , Blay Marine Le , Saldi Joshua
Published: October 2024

In active matter, where constituents are intrinsically out-of-equilibrium, even the highest-symmetry phases come with surprises. When activity is coupled negatively to density, such as in assemblies of self-propelled units, phase separation can occur without attractive interaction, a well-studied phenomenon known as motility-induced phase separation. In stark contrast, the consequences of a positive coupling between density and activity on the collective behaviour of active matter remain uncharted. Here, we unveil the phenomenon of collective activity, which emerges from this positive coupling among non-motile active units. We demonstrate its genuine propensity for disorder and leverage its potential in guiding self-assembly. To do so, we experimentally study collectives of scalar active units undergoing self-sustained oscillations induced by contact-charge electrophoresis. We explain the spontaneous formation of an oscillator gas by collective activity resulting from super-elastic collisions. Unravelling the origin of binary collisions allows us to tame collective activity, giving us precise control on the structure of the oscillator gas and its eventual crystallization. Our work highlights and quantifies the importance of the coupling between activity and density in active phases. It is a launch pad for exploring lower-symmetry active systems with new eyes where activity may be coupled not only to density, but also to broken-symmetry variables.
Environmental Sustainability in Bangladesh trough renewable energy, foreign direct investment, and trade openness: Evidence from Load Capacity Factor and Inverted Load Capacity factor with Fourier Functions
Authors: Qamruzzaman Md
Published: October 2024

This study investigates the effect of renewable energy consumption (REC), trade openness (TO), and foreign direct investment on environmental sustainability in Bangladesh during 1990–2022. For this purpose, it uses innovative input parameters, Load Capacity Factor (LCF) and Inverted LCF as performance indicators. The study adopts Fourier ARDL and the Fourier NARDL method to investigate the symmetric and asymmetric effects of REC, TO, and FDI on environmental sustainability in Bangladesh, which is a distinctive feature compared with other studies. This procedure can represent complex non-linear relationships between these two variables by invoking Fourier functions, elucidating a more complete picture of economic growth and environmental impact dynamics. Specifically, the results reveal that both REC and TO positively associate with environmental sustainability via lower CO2 emissions and ecological footprints. At the same time, FDI has an intricate relationship feature that exhibits non-linear impacts. The study findings provide a fresh look at the existing EKC hypothesis regarding environmental quality deterioration and the adoption of cleaner technology that is associated with economic growth through LCF. Results highlight the necessity of ad-hoc, effective, and sustainable energy policies, investment in renewables and green energies, as well as regarding trade practices. The results provide some policy insights on improving energy efficiency and achieving sustainable development. Policymakers need to embrace green technologies and pursue politics to enhance economic prospects while maintaining balance with the environment. The implications of the study are significant to consider for Bangladesh to reach its SDGs and achieve sustainability.
A New Controllable Multi-Wing Chaotic System: Applications in High- Security Color Image Encryption
Authors: Ding Pengfei , Geng Penghui , Hu WeiWei
Published: October 2024

Due to its rich dynamic behaviors and diversity, the multi-wing chaotic system has garnered widespread research interest, and its emergence and applications are currently under intensive investigation. In this paper, based on the Sprott-A system, a four-dimensional controllable multi-wing chaotic system is proposed by incorporating a cosine function. The system can generate a controllable number of wings by adjusting its parameters, thus realizing the precise control of chaotic behavior. Through numerical simulation, the high randomness and complexity of the system are verified. On account of the superiority of the system, a new color image encryption method is designed based on this new system. The method uses chaotic sequences to implement DNA-level image scrambling operation, and discrete wavelet transform (DWT) to decompose the scrambled image, then scramble these decomposed components. The scrambled matrices are reconstructed with inverse discrete wavelet transform (IDWT), and diffused to produce the ciphertext image. Ultimately, the results of simulations and security evaluations indicate the high-security level of the suggested image encryption technique.
Towards Algorithmic Framing Analysis: Expanding the Scope by Using LLMs
Authors: Kuang Xianwen , Liu Jun , Zhang Haiyang , Schweighofer Simon
Published: October 2024

Framing analysis, an extensively used, multi-disciplinary social science research method, requires substantial manpower and time to code and uncover human-level understanding of story contexts. However, recent advances in deep learning have led to a qualitative jump in algorithm-assisted methods, with large language models (LLMs) like BERT and GPT going beyond surface characteristics to infer the semantic properties of a text. In this study, we explore the application of the LLM BERT-NLI, which leverages bidirectional context and rich embeddings to assist scholars in identifying contextual information in media texts for quantitative framing analysis. More specifically, we investigate the capability of LLMs to identify generic media frames by comparing the results from a zero-shot analysis using BERT-NLI to those from human analysis. We find that the reliability of detecting generic frames varies significantly across different datasets, indicating that even a large LLM like BERT-NLI, trained on millions of texts from diverse sources, cannot be uniformly trusted across different contexts. Nonetheless, LLMs might be employed productively in specific contexts after careful consideration of their agreement with human-generated ratings.
Causal relationship between sex hormone-binding globulin, 25-hydroxyvitamin D and polycystic ovary syndrome: a two-sample bidirectional Mendelian randomization study
Authors: Ou Yan , Li Yan , Zhang Xi , Liu Xiao , Wen Xiaomin , Liang Yong , Wang Qi
Published: October 2024

Many studies have reported that sex hormone-binding globulin (SHBG) and 25-hydroxyvitamin D (25(OH)D) are important factors affecting polycystic ovary syndrome (PCOS), but their interrelationship remains controversial. Our study employed bidirectional Mendelian randomization analysis to elucidate the causal relationships between SHBG, 25(OH)D, and PCOS. The genetic loci closely related to SHBG, 25(OH) D and PCOS were extracted from large-sample GWAS data as instrumental variables. Five algorithms, namely, MR‒Egger regression, weighted median, inverse variance weighting (IVW), simple mode and weighted mode, were used for bidirectional Mendelian randomization analysis. In addition, the Cochran Q test was used to evaluate heterogeneity, the MR‒Egger intercept plot and the funnel plot were used to test horizontal pleiotropy, and sensitivity analysis was performed with the leave-one-out method to evaluate whether there was a correlation between SHBG, 25(OH)D and PCOS. We found that a decrease in SHBG and 25(OH) D levels is a genetic susceptibility factor for PCOS, whereas PCOS does not lead to a change in SHBG and 25(OH) D levels. In addition, a positive causal relationship was found between SHBG and 25(OH) D, with a decrease in SHBG leading to a corresponding decrease in 25(OH) D, whereas the change in SHBG was independent of 25(OH) D.
Effects of Corporate Transparency on Tax Avoidance: Evidence from Country-by-Country Reporting
Authors: Tuinsma Tijmen , De Witte Kristof , Janský Petr , Palanský Miroslav , Titl Vitezslav
Published: October 2024

Since 2016, multinationals with a revenue over EUR 750 million have to submit country-by-country reports to tax authorities to deter tax avoidance. Using a regression discontinuity design, we provide evidence for an increase in affected multinationals’ effective tax rates. However, the most aggressive multinationals with known tax haven presence were only moderately affected. The effect is mainly driven by medium-aggressive firms, which achieved low effective tax rates without tax haven affiliates to shift profits to. The policy was thus effective in combating some tax avoidance but profit shifting to tax havens remains an issue, explaining the push for further policy measures including the global minimum corporate tax rate.
JEL codes: F23, H25, H26
Evaluating Sustainable Calcium Sources for Poultry Nutrition: A Comparative Study of Figuil Limestone, Shellfish and Quail Eggshell
Authors: Djanabou Moussa , Djitie Francois K. , Njimou Jacques Romain , Lemougna Patrick N. , Kepdieu Jean M. , Radu-Rusu Razvan M. , Njintang Nicolas Y.
Published: October 2024

Calcium plays a crucial role in poultry nutrition, significantly impacting skeletal development and eggshell quality. This study investigates the synergistic and physicochemical properties of Figuil limestone, Douala shellfish, and Ngaoundere quail eggshells as potential dietary calcium sources, with a strong emphasis on animal welfare in poultry production. Utilizing advanced analytical techniques including X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDX), we conducted a comprehensive assessment of these materials. Our results indicate that Figuil limestone and quail eggshells are predominantly composed of calcite calcium, while shellfish primarily contain aragonite calcium. The calcium oxide (CaO) content was determined to be 50% in Figuil limestone, 42% in shellfish, and 26% in quail eggshells, with varying concentrations of magnesium (Mg), aluminum (Al), silicon (Si), and iron (Fe). Substituting shellfish meal with limestone powder notably influenced broiler feed consumption at six weeks of age, positively affecting live weight and average weekly weight gain. Remarkably, treatment T4 (100% limestone) demonstrated particularly promising outcomes. This research underscores the importance of animal welfare by adhering to EU standards for the protection of animals in research. Our findings advocate for Figuil limestone powder as a sustainable and ethically sourced alternative to shellfish meal in broiler diets, capable of complete replacement up to 100%. This study highlights Figuil limestone's potential as a viable calcium source in animal feed formulations, offering environmentally friendly options for poultry nutrition while promoting animal welfare and delivering economic benefits to both developed and developing regions.
The Immutable Law of Digital Document Pixelation: A Study of Authentic and Forged Documents
Authors: Garzotto David
Published: October 2024

This paper introduces the "Immutable Law of Digital Document Pixelation," which posits that in authentic digital documents, the signature should never exhibit higher pixelation than the surrounding text, as the signature is applied last in the creation process. The study examines 265 authentic notarized deed documents and 12 suspected forgeries. A control group of digitally manipulated documents was created to test the hypothesis. Results demonstrate that most authentic documents follow the Immutable Law, with signatures showing consistently lower pixelation levels compared to surrounding text. However, some forgeries showed lower pixelation for signatures due to manipulation through higher resolution, indicating forgers’ attempts to evade detection. Findings validate pixelation analysis as a tool for detecting digital forgeries and highlight the need for future AI-based methods.
Detecting Digital Forgeries Through HEX/RGB Color Discrepancy Analysis in Forensic Document Examination
Authors: Garzotto David
Published: October 2024

As digital documents and signatures become more prevalent, the field of forensic document examination must adapt to detect forgeries effectively. Traditional methods, such as ink analysis and stroke pattern recognition, are often unsuitable for digitally signed or scanned documents. This paper presents a novel method for detecting forgeries by analyzing HEX/RGB color discrepancies in digital documents. By using Euclidean distance to measure the variation between RGB values of different parts of a signature or document, this method quantifies color inconsistencies, providing a non-invasive, objective means of determining forgery. The results indicate that this approach has strong potential to complement or replace traditional forensic methods in the digital age.
Impact of Music Expression-Related Parameters on Pianists’ Kinematics and Muscle Activity: A Systematic Review
Authors: Mailly Robin , Turner Craig , Goubault Etienne , Maso Fabien Dal , Verdugo Felipe
Published: October 2024

Bodily gestures are essential in piano performance. They allow sound production and, at the same time, facilitate the communication of the expressive content of music. From pianists’ perspective, music expression-related parameters include not only single performance parameters (timing, sound intensity, articulation, etc.), but also more complex parameters (named hereafter abstract parameters), such as music structure features (e.g., phrasing) and extra-musical ideas (e.g., emotions, narratives, etc.). This systematic review aimed to investigate the impact of both performance and abstract parameters related to music expression on kinematics and muscle activity of expert pianists. As complementary objectives, we documented ontological and methodological differences between the studies included, and we addressed how music expression-related parameters affect pianists’ exposure to risk factors of injuries. The search strategy consisted of using concepts and keywords in Medline, Embase, SPORTDiscus, and Web of Science databases, and we followed the PRISMA guidelines. Fifteen studies were included. Ten studies focused on performance parameters, four studies focused on abstract parameters, and one study addressed both performance and abstract parameters. Performance and abstract music expression-related parameters impacted pianists’ kinematics and muscle activity in a variety of ways. The specific effects were dependent on the type of task and the gestural variable investigated by studies. Important differences in ontological (performance or abstract parameters studied, gestural variable investigated) and methodological choices (experimental task and instrument used, data acquisition and processing procedures) prevent the establishment of a thorough dialogue between music research studies and biomechanics and motor control studies. A set of performance parameters (playing loud, playing fast, staccato articulation, large handspan chords) were identified as potential risk factors of injuries. Further interdisciplinary research mixing methods from empirical music research and biomechanics would help enhance knowledge on the impact of music expression on pianists’ gestures for both performance and injury prevention purposes.
Analysis of the Network’ Structure of the Protected Areas of Сity Districts Using the Example of the Far Eastern Federal District
Authors:   Institute of Water and Environmental Problems,  Far Eastern Branch of the Russian Academy of Sciences, Debelaya Irina D. , Morozova Galina Yu. ,   Institute of Water and Environmental Problems,  Far Eastern Branch of the Russian Academy of Sciences
Published: October 2024

The activation of socio-economic development of the Far Eastern Federal District has aroused interest around Russian and foreign practices for improving the quality of life of city residents, particularly in developing a network of protected areas (PA). The study’s goal is to analyze the structure of the network of protected areas in 11 Сity Districts including the administrative centers of the constituent entities that are of the part of the Far Eastern Federal District is presented. Research objectives: determination of the structure’s elements of the urban protected areas network; identification of quantitative and qualitative indicators characterizing the key elements of the PA network; conducting a comparative analysis in City Districts according to the degree of activation of the progress of forming a PA network. The work was carried out using the comparative geographical research method. Regulatory documents, statistical materials, cadastral information and target programs were analyzed. Networks of urban PA include three components: PA of federal, regional and municipal levels; ecological corridors, buffer zones. Yakutsk, Vladivostok and Blagoveshchensk lead in terms of the PA total area, which is due to the large area of these municipalities. Out of the 11 City Districts studied, 9 have organized protected areas of different levels of management and 14 categories. But protected areas of federal, regional, and municipal significance were developed in only two – “Yakutsk City” and “Blagoveshchensk City District”. It was established that PA of 14 categories were organized in 9 City Districts. The specificity of urban protected natural sites is reflected in the establishment of categories of PA with significant areas of wild nature as a calm zone, a resource reserve, a protected coastline, and a protected natural landscape. The network of PA in most City Districts is underdeveloped. The exceptions are “Blagoveshchensk City District”, “Vladivostok City District” and “YakutskCity”, where the indicator “share of protected areas from the total area of the City District” is 44,3, 29,5 and 25,7 % respectively. The picture of the formation of a PA network in City Districts of the Far Eastern Federal District is presented. The characteristics of PA were determined by natural factors, settlement and economic development practices, institutional changes, the realities of regional development of urban planning cases taking into account the environmental component. The research findings serve as an information basis for creating scenarios for the strategic development of City Districts including the environmental component that permeates the entire city fabric.
Geoecological Mapping of Buildings in Flood-Prone Areas Shilka and Nerchinsk (Transbaikalia), Using the NDBI Spectral Index and a Neural Network
Authors:   Transbaikal State University, Kochev Denis V.
Published: October 2024

At all times, the problem of floods has been relevant due to their destructiveness, frequency and poor predictability. The situation is complicated by the fact that floodplains are used for economic, recreational and other activities, thereby exposing the risk of destruction and degradation of any objects and human waste products during floods. Therefore, mapping and spatiotemporal monitoring of flood-prone areas in order to analyze and predict the likely material and economic damage to facilities of economic activity from the threat of floods is an urgent scientific problem that can be solved by geographic information systems using satellite data processed by spectral indices and convolutional neural networks. The object of the study is the flood-prone territories of Shilka and Nerchinsk (Transbaikal Region). The purpose is to assess the accuracy of economically developed territories decryption in flood-prone areas of Shilka and Nerchinsk in order to determine the effective threshold for separation of the studied facilities. Research objectives are as follows: collection and formation of an archive of Earth remote sensing data of the Landsat-8 OLI program; inference of satellite images on a neural network and their use as a reference image; calculation of NDBI spectral indices based on Landsat-8 data; determination of the areas of buil­­t-up and economically developed territories in the images; assessment of the accuracy and comparative analysis of the results of the development facilities allocation and economic activity; identification of advantages, disadvantages, applicability limits of the methods used to decrypt buildings and objects of economic activity in flood-prone areas. The accuracy and reliability of the results of the decrypting buildings and objects of economic activity by calculating the NDBI spectral index, the inference of a convolutional neural network according to Landsat 8 OLI data in flood-prone areas of Shilka and Nerchinsk have been evaluated. The most effective methods, parameters and thresholds for decrypting buildings and objects of economic activity have been determined in order to monitor the development of flood-prone areas and control the flood-prone situation.
On the Geochemical Zoning of the Verkhnealiinsky Gold Deposit in Transbaikalia (Russia)
Authors: Yurgenson Georgy A.
Published: October 2024

The relevance of the study lies in the need to have objective geochemical data to assess the erosion section level of newly discovered manifestations of ore deposits. One of the examples, used to solve this problem, is the results of the mineralogy and geochemistry study of the Verkhnealiinsky gold deposit in Transbaikalia. The purpose of the study is to determine the zonality in the distribution of minerals, gold and associated chemical elements in the deposit space and to evaluate them as criteria for ore zoning. The object of the study is the Verkhnealinsky gold deposit. The subject of the research is the spatial distribution of minerals and chemical elements in the gold ore zones of the deposit. The methodology consists in diagnostics, determination of the chemical elements content and the establishment of regularities in their spatial distribution using modern methods of analysis, namely, electron microscopy, assay analysis and ICP MS, determination of the degree of the crystal structure perfection. The results of the study are as follows: the content of gold and associated chemical elements in the three most industrially important ore-bearing zones of the Western, Latitudinal and Eastern zones, which differ in the depth of formation, have been determined. The least deep Eastern zone is characterized by the intensive development of zinc, lead, antimony, and arsenic minerals and, accordingly, their maximum content in its upper part. For the deepest Western zone, the maximum development of pyrrhotite, chalcopyrite, and cobalt has been revealed, and it is shown that the cobalt-nickel ratio is an important criterion for assessing the level of erosion cut. An important criterion of depth is also the degree of the crystalline structure perfection of vein quartz, which depends both on the crystallization rate, which is determined by the depth from the day surface during the formation of the deposit, and on the amount of isomorphic impurities in it. It is also shown that one of the important criteria for the level of erosion section is the content of rubidium in veined quartz and arsenic in pyrite.
Development of the Regional Electoral Process in Russia (on the Example of the Republic of Sakha (Yakutia))
Authors:   North-Eastern Federal University named after M. K. Ammosov, Petrov Yuriy D. , Grigoriev Nurgun A. ,   North-Eastern Federal University named after M. K. Ammosov
Published: October 2024

In this article, the authors conducted a study of the regional electoral process development in the Russian Federation using the example of regional elections in the Republic of Sakha (Yakutia) in 2018 and 2023, and specifically the elections of the Head of the subject and the Legislative Assembly of People’s Deputies (Il Tumen). The purpose of the work is to analyze the dynamics, factors of the results and process of elections in the region. The article used an institutional approach, in which the object of research is regional authorities – the Institute of Heads of Subjects of the Russian Federation, as well as regional parliaments (legislatures, assemblies). The following tasks are identified: to study the process of the Russian electoral system evolution at the federal and regional levels; determine the influence of federalism factors on the relations development between the federal center and regions; determine the main theoretical foundations for studying the regional electoral process, as well as the degree of competition in elections; study the results of regional elections in 2018 and 2023. The object of the study is the regional electoral process in Russia, the subject of the study is the regional elections of the Head of the subject and the Legislative Assembly of People’s Deputies of the Republic of Sakha (Yakutia). Within the framework of this article, the authors have come to the following conclusions and results: since 2012, after the return of the practice of direct elections of Heads of subjects and the return of the proportional electoral system, the development of a new electoral cycle begins in the regions; after the centralization of federal relations in the 2000s. the party composition of regional parliaments has become similar to the composition of the federal parliament of the State Duma, consisting of 4–5 parties. According to the results of the last two regional elections in the Republic of Sakha (Yakutia), the current governor A. Nikolaev has won, and in the elections in Il Tumen the leading position has been occupied by the United Russia party.
Rotation of the Governor’s Сorps in the Regions of the Far Eastern Federal District: Trends and Features
Authors:   Voronezh State University, Voronezh, Romanovsky Alexander A.
Published: October 2024

The article reveals the rotation of the governor’s corps in the regions of the Far Eastern Federal District, its trends and features. The object of the study is the Institute of heads of subjects of the Russian Federation. The subject is their rotation in the regions of the Far Eastern Federal District. The purpose of the work is to identify the main trends in updating the composition of the heads of the subjects of the Russian Federation in the Far Eastern Federal District. The objectives of the study are as follows: to analyze the affiliation of current and previous governors to a particular professional field before appointment; to identify the specifics of the personnel policy of the federal center, taking into account the criterion of the regions’ heads connection with the relevant territories before appointment; to determine the reasons for the governors’ rotation; to identify the features of the elections’ results of the subjects heads in the Russian Federation belonging to the Far Eastern Federal District in 2023. Based on the results of the analysis, it can be concluded that most of the subjects’ heads in the Russian Federation within the study district have been already related to the executive branch of government, mainly in other regions, and the rest went to work in the regional governments of the Far Eastern Federal District from the federal parliament, municipal government and industry. If earlier, when determining the candidates for governors, emphasis has been placed on local personnel, then in the current situation, only three heads of the subjects in the Russian Federation can be attributed to people from the regions who head them. The conducted content analysis of the media has showed that the main reasons for the subjects’ heads rotation in the Russian Federation included in the Far Eastern Federal District are resignations "on their own initiativeˮ. The current governors, whose term of office expired in 2023, have been re-elected, receiving an average of 75 % of the vote. The author comes to the conclusion that when updating the corps of regions’ heads belonging to the Far Eastern Federal District, senior officials, as a rule, come from the sphere of executive power, the representation of the governors-"outsiders" is noticeably strengthened, the predictability of most resignations of heads of regions is observed, less pronounced support of the population for the re-election of governors in comparison with the results of elections in other regions.
On the Issue 0f Imported the Quality Wells In-Situ Leaching of Uranium in the Cryolithic Zone
Authors:   JSC ", Ivanov Alexander G. ,   Leading Design and Survey Research and Design and Survey Institute of Industrial Technology", Arsentiev Yuri А. ,   Russian State Geological Exploration University, Gladyshev Andrey V. ,   JSC "Leading Design and Survey Research and Design and Survey Institute of Industrial Technology", Mikhailov Anatoly N. ,   JSC "Khiagda", A. Gurulev Evgeny A. ,   JSC "Khiagda", Ivanov Dmitry A. ,   Weatherford Company
Published: October 2024

The peculiarity of mineral deposits in Russia is that about 75 % of them are located in the cryolithozone (Academician of the Russian Academy of Sciences Melnikov V. P.). Uranium deposits, located in the cryolithic zone and mined by the in-situ leaching (ISL) method, are located in Transbaikalia and make a significant contribution to the all-Russian production of this metal. Difficult mining and geological conditions of mining require the adoption of extraordinary technical approaches to solving issues related to the development of such deposits. One of them is to improve the quality of construction of ISL uranium process wells and maintain their operational characteristics throughout the entire period of their operation. The relevance of the work is associated with the need to ensure efficient and environmentally safe uranium mining by in-situ leaching in the cryolicticsone. The object of the study is a deposit of in-situ uranium by ISL. The subject of the study is presented by peculiarities of construction of in-situ uranium leaching process wells in the cryolithozone. The purpose is to develop proposals to improve the quality of process wells. This paper examines the design elements of process wells that affect their operational characteristics, as well as the factors that influence the choice of decisions made The fulfillment of these tasks is complicated by the fact that polymer pipes, made of materials resistant to working solutions, are used as casing: low-density polyethylene, HDPE made of polyethylene PE100 (used earlier) and unplasticized polyvinylchloride NPVC with modifiers of frost resistance and impact strength (current used) or oriented NPVC with increased physical and mechanical characteristics (will be used in the future). Polymer pipes have significantly lower strength characteristics compared to steel pipes, which again requires non-standard solutions to ensure the reliability of production strings (PS) at various stages of the construction of process wells and during repair work on them. In this paper, issues related to the natural conditions of well construction, the stability of EC sections located in the cryolithozone zone and methods of its support, methods and materials for equipping the wellheads of technological wells are considered, information is provided on the results of laboratory work performed, separate stages of the technology for the application of the obtained viscoelastic.
Zoning оf the Altai Region Territory According to the Degree of Climate Risks
Authors:   Institute for Water and Environmental Problems Sibiria Branch of the Russian Academy Sciences, Vinokurov Yuriy I. , Krasnoyarova Bella A. ,   Institute for Water and Environmental Problems Sibiria Branch of the Russian Academy Sciences, Kharlamova Nataliya F. ,   Altai State University, Sharabarina Sofia N. ,   Institute for Water and Environmental Problems Sibiria Branch of the Russian Academy Sciences
Published: October 2024

Climate change is recognized as one of the global challenges to sustainable development of society. The efforts of the international scientific community, political structures, and society are aimed at solving the problems of adapting to these changes. The Russian Federation has developed strategic documents that define the main directions of action to prevent the negative consequences of climate change in various sectors of the economy and adaptation measures to them. Such documents at the regional level include "Climate Safety Passports", which are the information and analytical basis for determining specific measures. This article presents selected results of studies carried out in the Altai Region Territory in 2023. The object of study is the Altai Region Territory, located at the junction of the West Siberian Plain and the mountains of Southern Siberia. The purpose of the study is to develop a zoning scheme for the Altai Region Territory according to the degree of manifestation of climate risks based on an assessment of long-term climate changes in the region. Retrospective analysis methods of changes in the thermal regime and annual precipitation for the period 1961–2020 and forecasting these changes over a 30-year interval (until 2050) have been used to achieve this goal. Regionalization is based on the methodology of physical-geographical zoning. Based on the results of the study, six natural and climatic regions with different levels of regional consequences were identified on the territory of the Altai Region Territory. A very tense situation has developed in the South Aleisky steppe and Upper Ob forest-steppe regions having high concentration of population and objects of economic activity in conditions of high thermodynamic and hydrological risks. An increased degree of danger of thermodynamic risks is typical for the Kulunda steppe region. The remaining areas are characterized by a moderately dangerous level of climate risks, mainly due to the presence of a "mountain component" on their territory. For each source of risk, the sectors of the economy were determined witch are most exposed to these risks. The main directions of adaptation to these risks are found.
Mineralogical and Geochemical Features of the Gold-Containing Ores of the Pakrut Deposit (Central Tajikistan) As the Basis of Gravity Enrichment
Authors:   V. I. Nikitin Institute of Chemistry, NAST, Kholov Kholmahmad I. , Niyozov Ansor S. ,   Tajik National University, Juraqulov Sherzod R. ,   V. I. Nikitin Institute of Chemistry, NAST
Published: October 2024

The mining sector, in particular gold mining, plays an important role in the economy of Tajikistan. Today, the issue of optimizing gold mining mechanisms, increasing its efficiency and expanding the resource base is of topical importance. The depletion of easily accessible gold deposits is stimulating the development of methods for extracting gold from refractory and low-grade ores. One of the promising methods of pre-treatment of such ores is gravity enrichment. The aim of the study is to characterize the Pakrut gold deposit, to determine its mineralogical and chemical composition, and to develop an optimal gravity enrichment scheme for gold recovery. Research objectives are as follows: to study the mineralogical composition and geochemical characteristics of gold-bearing ores, and then to develop a technique for their gravitational enrichment. The object of the study is the gold-bearing ores of the Pakrut deposit (Central Tajikistan). Materials and methods of research: analytical work and enrichment in laboratory conditions were carried out in the chemical laboratory of the Pakrut Joint Venture, the ore enrichment laboratory of the V. I. Nikitin Institute of Chemistry of NANT, the Central Committee of the Main Geological Directorate under the Government of the Republic of Tajikistan. It is found that gold in the Pakrut ores is mainly represented by native gold and electrum. The main gold-bearing minerals are pyrite, arsenopyrite, sphalerite, galena, jamesonite and some vein minerals. The gold content in the ore is about 6 g/t. The granulometric composition of gold is extremely uneven. Most of the gold particles are less than 10 μm in size and are coated with gold-bearing minerals, which hindered their release during grinding. In accordance with the characteristics of the gold deposit, gravity enrichment method has been used to extract the liberated coarse gold. Studies have shown that the gravity separation process is used for the primary processing of ore to recover coarse gold particles. The gold content and recovery in the gravity separation concentrates are 46.58 g/t and 44.59 %, respectively.
Corporate Financial Control in Asset Valuation
Authors:   Transbaikal State University, Panchenko Elena Yu. , Kibireva Elena B. ,   Transbaikal State University, Kazachenko Larisa D. ,   Transbaikal State University
Published: October 2024

The object of the research is the procedure of corporate financial control in the assessment of the value of assets in the context of the integration of international financial reporting standards into the domestic practice of reporting. The purpose of the study is to generalize the issues of corporate financial control in the assessment of the value of assets in the context of the integration of IFRS into the domestic practice of financial presentation Reporting. To achieve the goal, the following tasks are set: determining the role of financial control in the asset management system by forms and stages of control; clarification of the concept of corporate financial control for the purpose of asset management; study of changes in the scheme for the implementation of accounting estimates and reporting under RAS in the context of the integration of IFRS standards for the procedures of the stages of financial control. In the course of the study, the forms and stages of corporate financial control, the role of asset valuation in the implementation of control stages are considered; the differences in the approaches to asset valuation are presented based on the scheme of the relationship between accounting estimates and the presentation of financial statements for the implementation of financial control functions. The final conclusion is made about the need forformation of a comprehensive methodology of corporate financial control in assessing the value of assets in the asset management system. This methodo­logy should help in the implementation of the principles of reliability, completeness of information, usefulness, comparability of indicators in order to analyze the financial and economic efficiency of assets, the implementation of the balance sheet control function, and the formation of the fair value of asset items of the balance sheet.
Urban Settlements of the Far East in the Results of the Ten-Year Priority of Demography
Authors:   Transbaikal State University, Tomskikh Andrey A.
Published: October 2024

In the last decade, the problems of socio-economic development of the Far East have acquired a special geopolitical factor. The President of Russia has outlined the general trend of the country’s development – a turn to the east. Significant financial and managerial resources are being invested in the region. The most important factor in the development of the territory is declared to be demographic population growth through improving the quality of life of people in its broadest interpretation. Today we can state that this indicator has not been achieved in most regions, with the exception of only a fifth of the targeted territories. The object of the study is the urban settlements of the Far East in their territorial development; the subject of the study is the population of urban settlements as a factor of territorial development. The purpose of the study is to analyze the factors of urban growth points and explore the development of promising solutions to improve the demographic situation. Objectives of the study: analysis of population dynamics in Far Eastern cities and similar territories; typification of factors in the formation of the population of urban areas; development of proposals for their sustainable development. It is concluded that there are insufficient measures to improve the demographic situation of the Far East. The territories of the region are developing unevenly, inequality among themselves and with the European part of the country, is smoothed out too slowly, which leads to an even greater lag of the periphery from the federal and regional centers. All this is reflected, first of all, in population migration, which has been negative for many years. In addition to general regional policy measures and job creation in the region, it is proposed to pay attention to employment in cities, and not only in service activities. These are jobs in new industrial “urban clusters”, as points of growth and modernization of the region, anchor territories for the working population. In fact, we are talking about new industrialization and real jobs. The research methodology is based on the concept of “center-periphery” (“core-periphery”) and the typology method. Industry scientific methods are used: cartographic, statistical and comparative
On Some Features of Construction and Operation of Technological Wells in the Cryolithic Zone
Authors:   Leading Design and Survey and Research Institute of Industrial Technology, Ivanov Alexander G. , Wilmis Alexander L. ,   Russian State Geological Prospecting University, Arsentyev Yuri A. ,   Russian State Geological Prospecting University, Borovkov Yuri A. ,   Russian State Geological Prospecting University
Published: October 2024

A feature of Russian mineral deposits is that about 75% of them are loca­ted in the permafrost zone. Uranium deposits located in the permafrost zone and mined by the method of borehole in-situ leaching make a significant contribution to the all-Russian production of this metal. Complex mining and geological conditions of uranium mining in the permafrost zone require the adoption of extraordinary technical approaches to solving the issues of developing such deposits. The quality of process wells construction for in-situ leaching of uranium and the preservation of their operational characteristics throughout the entire period of operation. The relevance of the work is associated with the need to ensure efficient and environmentally safe uranium mining by in-situ leaching in a cryolithozone. This paper discusses the design elements of process wells that affect their operational performance, the temperature loads acting on production strings made of polymeric materials (low-density polyethylene and unplasticized polyvinyl chloride), the seasonality of well construction, and their operating modes. The author does not consider polymer materials of other types: fiberglass (have high brittleness, roads, tested in the late 1980s in Uzbekistan), metal-plastic (absolutely unsuitable for operation due to metal corrosion in case of violation of the polymer coating, for example, during repair and restoration work, were tested in Uzbekistan and Kazakhstan in 1985–1988, including with the participation of the author), polypropylene and acryl butadiene styrene pipes (low physical and mechanical characteristics). The analysis has showed that the temperature effect on polymer casing pipes is one of the most important factors, taking into account which it is possible to ensure trouble-free operation of constructed process wells. The work includes the analysis and processing of actual materials obtained during the construction and operation of wells. The conclusions have made it possible to determine the most effective technologies for equipping polymer production strings of technological wells, to select equipment elements and materials for waterproofing the casing space.
ASSESSMENT OF PATIENTS' QUALITY OF LIFE AFTER DAVID SURGERY
Authors: Zelenchuk Oleh , Stetsyuk Ihor , Sudakevych Serhiy , Yashchenko Natalya , Polishchuk Oleksiy , Rotar Maksym , Todurov Boris
Published: October 2024

Modern cardiac surgery increasingly requires rapid physical and mental rehabilitation of the patient. Today, more and more attention is paid to the peculiarities of psycho-emotional indicators in patients who are planned or have undergone surgical interventions. The quality of life of patients after David's operation for aneurysm of the root and ascending aorta remains unexplored.
The aim: assessment of the quality of life of patients with aortic aneurysm who underwent David's valve-preserving operation.
Materials and methods. From December 2015 to April 2023, 38 patients were operated on using the technique of aortic valve reimplantation with direct Dacron prosthesis "David" and 40 patients with prosthetic aortic valve and ascending aorta "Bentall operation".
The mean age of patients was 46.97 ± 12.2 years in group 1 and 52.08 ± 12.08 in group 2, respectively. The share of men is 92.1% in group 1 and 97.5% in group 2. The average observation period is 31.89 ± 22.42 months.
Results.Not a single fatal case was recorded within 30 days of the postoperative period. The percentage of survival after the observation period is 97.36% in group 1 and 92.5% in group 2.
We analyzed the quality of life of all patients according to eight scales: physical functioning (PH), role functioning (RP), pain intensity (BP), general health (GH), vital activity (VT), social functioning (SF), emotional condition (RE) and mental health (MH).
When analyzing patient questionnaires in the scale of physical functioning, we calculated a sufficiently high indicator, which was 94.59 ± 6.71% in group 1 and 79.5% ± 8.46% in group 2. On all other scales, there was also an advantage in the group patients who underwent David's operation.
Conclusions. From the obtained results, it can be stated that patients after David's operation in the medium term have excellent physical and mental health indicators and are completely adapted to daily life compared to the results after Bentall's operation.
David's valve-sparing operation, especially in isolated, planned situations, ensures normal functioning of the aortic valve with no regurgitation. This operation can be performed with very low rates of complications and postoperative mortality.
Thus, in our center, all patients with aortic root aneurysms are potential candidates for valve-sparing operations.