bluuebunny/crossref_metadata_2025 huggingface dataset:
Clinical application and anatomical study of Arterio-Venolization in Replantation of the Severed Fingers
Authors: yun chen , yanbin li , zemin wang , chang liu , yongjian sun , daozhang cai , jinghui yao
Published: April 2022

Objective To investigate the feasibility of arteriovenous operation in the replantation of the severed finger. Methods 65 patients with distal finger segment disjunction admitted from January 2014 to August 2021 were selected. According to the severity of finger injury, existing blood vessels and soft tissue conditions of the patients, the vascular anastomosis was determined, and they were grouped according to different blood vessel merging methods. Clinical comparison of postoperative effects between group A (12 cases of arterio-venolization replantation fingers) and group B, C and D (25 cases, 9 cases, 19 cases). After 1 to 7 years of follow-up and study. Meanwhile,In January 2022, ten isolated finger specimens were collected.The vascular routes and distribution were analyzed under the microscope, and the relationship between the arteriovenous arch and the body surface location markers was defined. The preferred vascular path of arterio-venolization was confirmed again.Results There were no significant differences in survival rate, length of hospital stay,the number of vascular crisis and skin necrosis between group A and B (P > 0.05). However,the length of hospital stay, the rate of partial skin necrosis and the incidence of vascular crisis in group C and D were higher than those in group A and B, and the survival rate of replantation finger was lower than that in group A and B (P < 0.05). In the anatomy process of the finger specimens, it was found that the nail base line was clearly and accurately used as the body surface positioning mark. There were a variety of arterio-venolization surgery options as the blood flow artery and the vein with a better match. The veins with a diameter of about 0.3-0.5mm on the lateral side of the non-dominant lateral nail groove of the proximal finger were preferred as the docking vessels. The distal artery was anastomosed with the proximal vein by super microscopic technique, and the anastomosis with the normal artery-to-artery on the other side formed a closed blood flow loop. Conclusion With no vein anastomosis, the treatment of distal finger amputation with super micro combined with arterio-venolizationis is convenient, safe and effective.
On the Robustness of Speech Emotion Models to Black-box Adversarial Attack
Authors: Gao Jinxing , Yan Diqun , Dong Mingyu
Published: April 2022

Speech emotion recognition is a key branch of affective computing. Nowadays , it is common to detect emotional diseases through speech emotion recognition. Various detection methods of emotion recognition, such as LTSM, GCN, CNN, show excellent performance. However, due to the robustness of the model, the recognition results of the above models will have a large deviation. So in this article, we use black boxes to combat sample attacks to explore the robustness of the model. After using three different black-box attacks, the accuracy of the CNN-MAA model decreased by 69.38% at the best attack scenario, while the WER of voice decreased by only 6.24%, indicating that the robustness of the model does not perform well under our black-box attack method. After adver-sarial training, the model accuracy only decreased by 13.48%, which shows the effectiveness of adversarial training against sample attacks.
Stereotactic radiosurgery ensures an effective and safe long-term control of Koos grade IV vestibular schwannomas: a single-center, retrospective, cohort study
Authors: Umekawa Motoyuki , Shinya Yuki , Hasegawa Hirotaka , Kawashima Mariko , Shin Masahiro , Katano Atsuto , Minamitani Masanari , Kashio Akinori , Kondo Kenji , Saito Nobuhito
Published: April 2022

Purpose: Stereotactic radiosurgery (SRS) is a standard treatment modality for vestibular schwannomas (VSs). However, there is a paucity of data on tumor control and neurological preservation for larger VSs. We aimed to investigate the long-term effectiveness of SRS for Koos grade IV compared with I-III VSs.Methods: We included 452 patients with VSs (50 Koos grade IV and 402 Koos grade I‒III) who were treated with SRS at our institution from 1990 to 2021. Tumor control and functional preservation were calculated using the Kaplan–Meier method and compared between groups with the log-rank test.Results: The median post-SRS follow-up period was 68 months. Tumor control rates were 96% at 5 and 10 years for Koos grade IV VSs, and 97% and 95%, respectively, for Koos grade I‒III VSs (p = 0.744). In Koos grade IV VSs, functional preservation rates of the facial and trigeminal nerves were both 96% at 5 years (both 98% for Koos grade I‒III VSs; facial, p = 0.410; trigeminal, p = 0.107). Hearing preservation rates were 61% at 5 years for Koos grade IV VSs and 78% for Koos grade I–III VSs (p = 0.645). Symptomatic transient tumor expansion was more common with Koos grade IV VSs (8.0% vs. 2.5%, p = 0.034), although all related symptoms diminished in accordance with tumor shrinkage.Conclusion: SRS may contribute to long-term tumor control and adequate neurological preservation in the treatment of Koos grade IV VSs, comparable to those in the treatment of Koos grade I‒III VSs.
Reinvestigating group-velocity-tunable Bessel-X optical wave-packets
Authors: Li Zhaoyang , Liu Yanqi , Leng Yuxin , Li Ruxin
Published: April 2022

The group-velocity of the Bessel-X optical wave-packet can be controlled by introducing well-designed arbitrarily-axisymmetric pulse-front deformation, which permits realizing superluminal, subluminal, accelerating, decelerating, and even nearly-programmable group-velocities. To better understand the tunability of the group-velocity, the generation methods of this Bessel-X optical wave-packet and the mechanisms of the tunable group-velocity in both the physical and the Fourier spaces are investigated. We also studied the relationship with the recently-reported space-time optical wave-packet, and the group-velocity-tunable Bessel-X optical wave-packet is a subsection of the space-time optical wave-packet.
Experimental quantum state discrimination using the optimal fixed rate of inconclusive outcomes strategy
Authors: Gómez Santiago , Gómez Esteban S. , Jiménez Omar , Delgado Aldo , Walborn Stephen P. , Lima Gustavo
Published: April 2022

The problem of non-orthogonal state discrimination underlies crucial quantum information tasks, such as cryptography and computing protocols. Therefore, it is decisive to find optimal scenarios for discrimination among quantum states. We experimentally investigate the strategy for the optimal discrimination of two non-orthogonal states considering a fixed rate of inconclusive outcomes (FRIO). The main advantage of the FRIO strategy is to interpolate between unambiguous and minimum error discrimination by solely adjusting the rate of inconclusive outcomes. We present a versatile experimental scheme that performs the optimal FRIO measurement for any pair of generated non-orthogonal states with arbitrary a priori probabilities and for any fixed rate of inconclusive outcomes. Considering different values of the free parameters in the FRIO protocol, we implement it upon qubit states encoded in the polarization mode of single photons generated in the spontaneous parametric down-conversion process. Moreover, we resort to a newfangled double-path Sagnac interferometer to perform a three-outcome non-projective measurement required for the discrimination task, showing excellent agreement with the theoretical prediction. This experiment provides a practical toolbox for a wide range of quantum state discrimination strategies using the FRIO scheme, which can greatly benefit quantum information applications and fundamental studies in quantum theory.
Scientometric Analysis and Topic Modeling for Farm Financial Decision Modeling(FFDM)
Authors: Achamu Gedefaye , Atanew Eshetie Berhan , Gebeyehu Sisay Geremaw , Tilahun Shimelis
Published: April 2022

Scientometric analysis and topic modeling were deployed in this survey in order to map and structure knowledge in the state of the art of farm financing decision making. Application of scientometric approach based on bibliometric analysis help to capture the interest of scholars and organization to the problem domain and is also found essential in clustering keywords, authors, and publication to some sort of schemes and hence mapping of knowledge through visualizing map. Topic modeling as a complement of bibliometric analysis further extends and makes clear how those keywords are semantically related and their contribution to topics while clustering based on bibliometric analysis is binary. Using both methods and approaches refed as TAKe, publications from different sources and types were examined and analyzed for state of art of farm financial decision making. The survey then signals, in the state of the art of farm financial problems, financing has been treated for descriptive or exploratory purposes than as a decision variable hence predictive consultancy than prescriptive advisory in farm financing investment.
Climatic trends over tropics of Africa, A case of the Pra River Basin in Ghana
Authors: Nsiaha J.J. , Gyamfi C. , Anornu G.K. , Odai S.N. , Boakye E. , Awotwi A.
Published: April 2022

The likelihood of changing trends in climatic time series over the Pra River Basin in Ghana was examined. Trend analyses were carried out on monthly, seasonal, and annual timescales for temperature and rainfall from 1950 to 2010. The use of Modified Mann–Kendall, Sen’s slope and Pettit tests revealed warming trends over the Pra River Basin. Maximum and Minimum annual temperature time series revealed a statistically significant increasing trend over 60% of the stations with Sen’s slopes varying from 0.006 to 0.035 oC/yr. Monthly temperature extremes revealed a statistically significant increasing trend over 80% of the stations. Seasonality revealed both increasing and decreasing trends for both dry and wet seasons, while annual rainfall experienced a decreasing trend in four out of the five stations with only one station being statistically significant at a 0.05 level. Both dry and wet season rainfall experienced statistically significant decreasing trends for all stations except one at 0.05 level. Strong downward trends in rainfall were observed for the dry season while weak downward trends were observed for the wet season. Moreover, increasing change points ranging between 0.76°C– 0.93°C on average were experienced mostly for TMAX around the mid-1960s through to the early 1980s. While decreasing change points within a range of between − 0.99°C and − 0.61°C on average were also observed for TMIN around the late 1950s through to the mid-1970s.
A cross-sectional Analytic study of Rate and Indication of Caesarean Section
Authors: Mohammed Atiya Kareem
Published: April 2022

Background: The indications for cesarean section fall into two classes: absolute, where there is no choice, and relative, where there is a choice of method of delivery, but cesarean section appears to offer the best chance of safety for both mother and child.Aime: To investigate the incidence and indications used for CS in Sulaimani maternity teaching hospital. Method: A descriptive-analytic, cross-sectional study was carried out in Sulaimani maternity teaching hospital from 1st October –to December 31st July 2020. The study included 790 pregnant women who had delivered by elective or emergency cesarean section during the study period. women were interviewed by the researcher with a special questionnaire on the same day or the day after the surgery and a review of the case sheet done for information like indications, and types of cesarean section (elective or emergency) which was written in the operative note. Also, an ultrasound report was needed for the calculation of gestational age. Data organization and analysis were done by SPSS version 22. Result: The incidence of C.S in Sulaimani maternity teaching hospital was 34.6% during the study period and common indications of cesarean section were having a previous cesarean section (22.1%), failure of progress (11.9%), and fetal distress (10%).Conclusion: The study concluded that Cesarean sections were common in the study region, and the rate was more than twice higher than WHO recommendation and previous C.S, failure of progress, and fetal distress were the commonest indications of C.S.It will also create awareness among the mothers to not choose cesarean delivery unless it is medically necessary and not to accept physicians’ decisions to do a CS without asking critical questions about the indication.
Identification of key iron metabolism-related long non-coding RNAs in hepatocellular carcinoma based on bioinformatics analysis
Authors: CHEN Yu
Published: April 2022

Background: The present study explored the regulatory mechanisms and functional roles of iron metabolism-related long non-coding RNAs (lncRNAs) in hepatocellular carcinoma (HCC) and their potential impact on prognosis of HCC patients. Methods: RNA-seq data and clinical information of HCC samples and normal samples were downloaded from The Cancer Genome Atlas (TCGA) database and International Cancer Genome Consortium (ICGC) portal. Iron metabolism-related genes were downloaded from Reactome database and AmiGo2 database. Differential expression and correlation analysis were performed to identify iron metabolism-related differentially expressed lncRNAs (DElncRNAs). Moreover, Kaplan-Meier (KM) survival and receiver operating characteristic (ROC) analysis were used to screen the possible prognostic and diagnostic biomarkers of HCC. Results: A total of 20 differentially expressed and iron metabolism-related genes (DEIMRG) were identified by overlapping 3746 differentially expressed genes (DEGs) and 86 IMRGs. Next, ARHGAP11B, LINC00205, LINC00261 and SNHG12 were screened through univariate Cox regression, and Kaplan-Meier survival curves also indicated that ARHGAP11B, LINC00205, LINC00261 and SNHG12 were related to overall survival (OS) of HCC patients in TCGA database. Interestingly, ARHGAP11B, LINC00205 and LINC00261 were identified as prognostic DEIMRGs of HCC patients after validating the survival results in ICGC portal. ROC curves showed that ARHGAP11B, LINC00205 and LINC00261 could distinguish well between normal and HCC samples. Furthermore, LINC00205 was identified as independently prognostic factor by multivariate Cox analysis combined with clinicopathological factors. Finally, a ceRNA network including 25 mRNAs, 15 miRNAs and 3 lncRNAs was successfully constructed, and the PPI network illustrated that CDC25A, CHEK1, CCNE2 and ANLN proteins interact more with other proteins. Conclusions: In conclusion, we identified iron metabolism-related LINC00205 as a prognostic and diagnostic biomarker and investigated the potential regulatory of LINC00205, which may contribute to the treatment of HCC.
A Classification of Misbehavior Detection Schemes for VANETs: A Survey
Authors: Sangwan Anupma , Sangwan Anju , Singh Rishi Pal
Published: April 2022

In today’s era, thinking of Vehicular Ad-hoc Network (VANET) as a midrib for the leaf of academic, social, corporate, and economic activities will not be erroneous. To avoid any panic situations like road accidents, heavy traffic jams, etc., the timely availability of correct information is compulsory. The presence of malicious nodes within the network will ruin the dream of establishing a safe, secure, and accident-free vehicular network. This objective can be fulfilled only when malicious nodes within the network are identified correctly and respective actions are taken at the right time. Therefore, there is a great requirement for efficient and intelligent misbehavior detection techniques to deal with such situations. Vehicular networks are very prone to numerous attacks, such as Sybil attacks, unauthorized access, etc. due to their dynamic nature. The main goal of this study is to discuss and bundle various available misbehavior detection schemes and respective solutions to cope with harmful attackers in the network. We have categorized different misbehavior detections on the criteria of architecture, approach, node-centric, and data-centric. The subcategorization is also given within the paper. One section of this paper focuses on the role of machine learning techniques in misbehavior detection as an emerging foot strap for further enhancement. A comparative analysis of various misbehavior detection schemes is also conducted based on performance measures like accuracy, False Positive Rate, Recall, Precision and F-measurement. Finally, the paper concluded by discussing open issues and various research challenges associated with misbehavior detection in the Vehicular Ad-hoc Network.
A rapid assessment of the impact of COVID-19 on the utilization of hospital services in Ondo State of South Western Nigeria
Authors: Zubairu Mahmud , Akin Fatiregun , Attah Onoja , Famokun Gboyega , Mahmud Mustafa , Touray Kebba , Olaoye Itse
Published: April 2022

Background: There is no doubt that COVID_19 has impacted on all facets of human activities everywhere, including ONDO state, Nigeria. However, empirical evidence of the extent of this impact in ONDO is lacking. The objective of this study was to evaluate the impact of COVID_19 epidemic on the utilization of hospital services & determine the existence of community transmission of COVID_19 in ONDO state using a proxy “Respiratory Tract Infections, RTIs”.Methods: The study used resident clinicians to conduct peer review of hospital utilization records. The review was retrospectively for the months of January to May for four consecutive years (2018 to 2021). The team reviewed outpatient records from 11 health facilities before the advent of COVID_19 (2018) to date (2021). Thousands of such records were scrutinized to reveal six parameters: number of antenatal visits; number of live births and total number of infants served BCG; number RDTs conducted for Malaria, number of RTIs seen and total number of patients for all other illnesses. Results: Results showed a decline in all parameters investigated except RTIs. Indeed, the proportion of RTIs - related hospital visits increased by about 22.8%.Discussion: The decline in the utilization of hospital services is expected given the lock down measures implemented to halt transmission of COVID_19 that makes it difficult to access health facilities. The rise in the incidence of RTIs may probably be that, they were COVID cases that were undetected due to limited COVID_19 testing capacity.Conclusion: The study concludes that COVID_19 epidemic impacted negatively on all aspect of hospital services except RTIs. The increment is statistically significant. As the most prominent of all symptoms of COVID_19 presents as respiratory tract disorder, a continued rise in RTIs despite declining rates of confirmed COVID19 cases in the state at the moment suggests that, there’s an ongoing community transmission.
RATIONING OF QUALITATIVE AND QUANTITATIVE LOSSES OF RADIOACTIVE ORES DURING MINING BY LAYERED SYSTEMS WITH A BOOKMARK
Authors:   Transbaikal State University, Chita, Ovseychuk V.
Published: April 2022

Increasing the mining efficiency of minera丨 deposits is achieved by reducing the quantitative and qualitative losses of mineral raw materials during extraction. One of the most effective development systems from this point of view is the systems of layered excavation of ores with filling the developed space with a hardening bookmark. This makes it possible to mechanize the extraction process as much as possible, which in turn makes the system flexible and mobile, changing the direction of the treatment workings, their width and height, depending on the changing values of the ore parameters. This makes it possible to minimize the clogging of the ore mass with waste rock and significantly increase the completeness of ore extraction. To establish the relationship between the characteristics of ore formations and the overall dimensions of mining equipment, studies were conducted that allowed determining the conditions for the use of various types of equipment for the extraction of minerals with specific characteristics (msr is the capacity of the ore body, asr - is the average uranium content). On the basis of these studies, a method has been developed for calculating the normative indicators of losses and dilution for the conditions of mining rock uranium mineralization by a layer system from top to bottom with filling the cleaning space with a hardening bookmark. To determine the calculated indicators, the distribution of power classes in ore bodies depending on its average value in the ore body and the distribution of uranium by concentration classes from its average content in the ore body were studied. The criterion for determining the losses during the breakdown is the conditioned indicator - the minimum metric percentage at which commercial ore can be obtained
KOREAN WAVE AS THE SOFT POWER OF THE REPUBLIC OF KOREA
Authors:   Far Eastern Federal University, Vladivostok, Vaulina М. , Gainullina Е.
Published: April 2022

The development of information and communication technologies has prompted states to increase cultural and socio-humanitarian resources. An example is the Korean Wave. It is designed to popularize Korean mass culture in order to achieve political and economic goals on the world stage. This phenomenon is unprecedented. There is a need for a comprehensive study of this phenomenon. The object of the study is the Republic of Korea. The subject of the study is the Korean Wave as a soft power tool of the Republic of Korea. The purpose of this study is to examine the impact of the “Korean Wave” on the popularization of South Korea in various countries around the world, its economic development, and the enhancement of its international prestige. The methodological basis of the study is based on general scientific methods such as historical-comparative, systematic, and measurement methods. The article is reviewing phenomenon of “Korean Wave”，which has recently gained wide popularity. The author emphasize the basic resources, which presents the “Korean Wave”. The article also describes the factors that determine the success of Korean mass culture spreading abroad. The historical and comparative method has helped to study the growing interest to Korean culture in Asia, Europe, and America and in other regions. The measurement method is used to determine the impact of the “Korean Wave” on the economic and political spheres of Korea. With the help of systematization, the main developed industries of the “Korean Wave” have been revealed. The authors also identify the main areas of the “Korean Wave” expansion. The article states that the “Korean Wave” has formed an attractive image of South Korea, which contributes to the achievement of the country’s economic and political goals. As a result, the authors has pointed out numerous positive factors of the use of the “Korean Wave”，such as attractive image, financial prosperity, economic and political goals achievement, cultural popularization
BACKGROUND ECOLOGICAL AND GEOCHEMICAL ASSESSMENT OF BOTTOM SEDIMENTS OF WATERCOURSES FOR THE TERRITORY OF THE VYUN GOLD DEPOSIT (REPUBLIC OF SAKHA-YAKUTIA)
Authors:   National Research Tomsk Polytechnic University, Tomsk, Mishankin A. , Yazikov E. ,   National Research Tomsk Polytechnic University, Tomsk, Filimonenko E. ,   Tyumen State University, Tyumen, Sobyanin Yu. ,   Boguslavets LLC, Yakutsk
Published: April 2022

As you know, quite significant gold resources are concentrated on the territory of the Russian Federation, but despite this, work aimed at expanding the mineral resource base of this most valuable metal, which plays a huge role in the country's economy, is still relevant. The object of this study is the territory of the Vyun gold deposit. The subject of the study is bottom sediments of watercourses in the territory of the Vyun gold ore deposit. The aim of the study is to assess the background ecological, geochemical and mineralogical characteristics of bottom sediments of watercourses in the territory of the Vyun gold deposit at the pre-production stage of its development. The work was carried out within the framework of complex ecological and geochemical studies and was organized in accordance with the methodological approaches and methodological recommendations that are currently relevant today. This article presents the results of studies of bottom sediments of watercourses flowing in the territory of the Vyun field. Elemental analysis of bottom sediment samples from watercourses was carried out by inductively coupled plasma mass spectrometry (ICP-MS).. The mineral composition of the samples was studied by optical microscopy, X-ray diffractometry and scanning electron microscopy. The relevance of research is due to the need to obtain background data on the state of the natural environment of the Vyun field, without which it is impossible to further assess the current ecological and geochemical state of the territory and forecast the environmental consequences of the industrial development of the field. At present, the importance of such work is often underestimated, although it is thanks to the background assessment that it is possible to have an idea of the initial parameters of the state of the territory of mineral deposits. This study has just such a focus and is devoted to assessing the background state of bottom sediments of watercourses in the territory of the Vyun gold deposit (Republic (Sakha-Yakutia))
具有最佳风险分布比率的合理管理决策模型开发
Authors:   伊尔库茨克国立研宄型技术 大学，伊尔库茨克, 别列戈娃 G ,   伊尔库茨克国立研宄型技术大 学，伊尔库茨克
Published: April 2022

文章提出了博弈论的原理，分析了公方和私方之间的静态和动态玩法，建立了风险分配方案和风险分配比例。业投 资项目、决策模型和确定模型最优解的特点。提出了基于多重收益的投资项目风险分配分析和单边风险接受模型， 并确定了投资项目的初步风险分配方案。建立具有最优风险分配比例的决策模型，得到纳什(Nash)模型的最优均衡 解，确定最优风险分配比例。结果表明，在工程项目风险分配的静态博弈中，风险偏好和参与者控制风险的能力决 定了一个初步的风险分配计划。文章提出了国家改善投资项目的法律环境、采取措施降低替代成本和交易成本、降 低谈判损失系数以实现双赢等建议。与此同时，人们认为公共部门应该创造一种公平有序的合作氛围。举办这些活 动将增加私人方参与项目的热情。私人方需要了解公共部门开展项目的目的和使命，并通过多种渠道和方法积极与 公共部门沟通，降低信息不对称程度，降低自身谈判成本。文章考虑了建立第三方机构提供项目风险评估和风险分 配咨询服务的可能性，并建立了灵活的风险分配和重新谈判机制，以确保管理决策的合理性。
THE USE OF AIRBORNE LIDARS IN HIGH-PRECISION GRAVITY PROSPECTING (ON THE EXAMPLE OF EASTERN TRANSBAIKALIA)
Authors:   Transbaikal State University, Chita, Gruzdev R. , Rylsky I. ,   Lomonosov Moscow State University, Moscow
Published: April 2022

In the production of high-precision gravimetric studies at ore deposits, an important factor is the methodical correctness of the work, which directly affects the subsequent costs and life cycle of a geological exploration enterprise. It is known, that gravimetric survey, in addition to the actual stage of measurements on the ground, includes the stage of eliminating errors introduced into the measurements by external fields and objects, in particular, the terrain. Methods existing and adopted at the state level involve the use of materials from cartographic funds (topographic maps at a scale of 1:100,000 - 1:25,000 and larger). It is also allowed to use open (free) terrain models. These materials are distinguished by a common characteristic feature - the lack of detail in thedisplay of the microrelief and steep inclined surfaces (slopes, walls, faults, incisions). These elements have a significant effect on the field values, measured by gravimeters, especially when measurements, are taken at points located at a small distance from the specified forms. In addition, the existing methods do not involve calculations using digital elevation models built from initial data with a high density of elevations (with a step of a few meters or more). All this creates the prerequisites for an insufficiently complete consideration of corrections in gravimetric measurements. At the same time, the technical capabilities of modern aviation remote sensing equipment make it possible to quickly obtain a high-precision digital model of the terrain over large areas. The most accurate, versatile and promising technology in this respect is the method of airborne laser (lidar) scanning. In this paper, the authors consider a methodology for performing work using both airborne laser scanning of the relief and other types of data (topographic maps 1:25,000, open data models). As part of the research, calculations were also made of the final corrections for the influence of the terrain and a comparison of the results obtained with each other. With the help of mathematical modeling and cartographic algebra, matrices (grids) of design parameters were constructed. The results of the study are clearly demonstrated in diagrams and diagrams, substantiating and illustrating the high information content of the study
MODELS AND METHODS OF GEOCHEMICAL ASSESSMENT OF THE RISK OF ROCK DUMPS INTERACTION WITH ENVIRONMENTAL FACTOR
Authors:   Federal State Autonomous Educational Institution of Higher Education Research Technological University “MISIS”，Institute of Information Technology and Computer Science, Moscow “National, Pshenichny I.
Published: April 2022

Models and methods of geochemical testing and evaluation of the influence of rock dumps on environmental factors are considered. The object of testing are samples of ores and rocks in the tailings dump formed during the extraction of porphyry-copper ores by an open method. The purpose of testing is to assess the risk of rock dumps" interaction with environmental factors, to determine the content of harmful substances in dust, as well as the formation of drainage of acidic rocks and leached metals. The task of testing is to analyze the average content of sulfur and sulfur sulfide in dump rocks and ores, to analyze the acid-neutralizing potential in these rocks and the potential for acid neutralization, as well as to assess the risk of rock dumps" interaction with environmental factors. Based on the acid base accounting indicators, characterizing the amount of acid-producing (sulfides) and acid-neutralizing (carbonates) minerals, as well as their ratios, an accelerated predictive assessment of the risk of acid drainage and mine water formation has been performed. With the help of geochemical testing of rock samples and dumps, the contents of sulfur, sulfur sulfide, acid-neutralizing potential and acid neutralization potential are determined. With the help of geochemical testing of rocks and ores, the impact of rock dumps on the external environment has been assessed, the content of harmful substances in dust and the influence of porphyry-copper ores on the formation of acidic drainage rocks and leached metals are determined. The data obtained made it possible to determine the level of saturation of watercourses with acidic products harmful to environmental factors. Based on the results of geochemical tests, options for the location of rock dumps and the construction of mining and processing industries during the development of the deposit are proposed
TECHNOLOGICAL LINE FOR ORE SORTING OF OUT-BALANCE URANIUM ORES AFFECTED BY ACCUMULATED INCLUSIONS OF LASTING WOOD DURING UNDERGROUND WORK (ON THE EXAMPLE OF PJSC «PRIARGUNSKOYE PRODUCTION MINING AND CHEMICAL ASSOCIATION»)
Authors:   PJSC «PPMCA»，Krasnokamensk, Beydin А. , Morozov А. ,   PJSC «PPMCA»，Krasnokamensk, Myazin V. ,   Transbaikal State University, Chita, Sokolova Е. ,   Transbaikal State University, Chita
Published: April 2022

The depletion of the mineral raw material base makes it increasingly necessary to involve in the exploitation of technogenic deposits affected by wood accumulations of the fastening forest, complicating the technological processes of extracting a valuable component from mineral raw materials [1; 2; 4]. Innovative developments to improve the technology of heap leaching of uranium are aimed, first of all, at improving the quality of products obtained during the ore sorting of off-balance ores using combined methods of radiometric separation and bulk screening. The development of technology for the separation of wood accumulations from off-balance ores determines the further efficiency of the processes of heap extraction of uranium. This direction is increasingly being used in practice in the processing of waste products of uranium and gold-bearing ores. The object of the research is a technological line for processing uranium off-balance ores. The subject of the research is the complex use of methods of radiometric separation and bulk screening for ore sorting and increasing the efficiency of uranium leaching by removing wood accumulations from technogenic raw materials. The purpose of the research is to identify the nature and patterns of distribution of mine props and wood chips depending on the volume of processing of technogenic raw materials of off-balance uranium ores at PJSC «PPMCA»). Research objectives are the following: to establish the patterns of extraction of mine props and wood chips from the volume of processing of off-balance ores during pilot tests of the technological line used at PJSC «PPMCA»; to identify the effectiveness of technical solutions for the processing of technogenic raw materials previously affected by wood accumulations in the form of mine racks and wood chips. Methodology and research methods are presented by: pilot-industrial assessment of the effectiveness of complex methods of radiometric separation and screening of technogenic raw materials in order to remove wood accumulations; regularity of removal of mine props and wood chips during ore sorting of off-balance uranium ores in the production line
Net investment position and the stock market: The case of traditional and ESG indices
Authors: Slepecký Jaroslav , Vorontsova Anna , Plastun Alex , Makarenko Inna , Zhyhlei Iryna
Published: April 2022

This paper explores the influence of traditional and ESG stock market indices on a country’s net international investment position. To do this, different methods, including ANOVA analysis, multiply regression analysis, correlation analysis, VAR-analysis and R/S-analysis, as well as the Granger causality test, are applied to quarterly data on the net international investment position, traditional and ESG indices from Finland, Sweden, France, Spain and Ukraine over the period 2005–2021. The results of descriptive statistics show that ESG indices are more volatile than traditional, but these differences are statistically insignificant according to ANOVA analysis. Correlation analysis provides direct evidence that ESG indices are highly correlated with their traditional analogues (correlation level varies from 0.88 to 0.96). Regression analysis results show that traditional and ESG stock market indices have no significant impact on the net international investment position. ESG stock market indices and net international investment position data are persistent, and autoregressive models can be applied to these data sets. On average, Hurst exponent is above 0.75 for the case of ESG indices and above 0.85 for the net investment position. This paper provides recommendations to improve the responsible investment framework.
Acknowledgment Alex Plastun gratefully acknowledges financial support from the Ministry of Education and Science of Ukraine (0121U100473).
Implementation of Marketing Strategy: A Case Study of an Online Upcycling Fashion Brand in Indonesia
Authors: Hanadhyas Anindita , Wulandari Nuri
Published: April 2022

The continuous growth of the fashion industry leaves tons of discarded clothing and garments. One way to address this issue is by upcycling or assembling worn or leftover garments into a new piece of clothing. With the growing sustainable awareness in Indonesia, consumers have started to look for clothing brands applying a sustainable practice. The research investigated the external and internal factors that could affect sales as well as brand awareness and identified the marketing strategy of a new upcycling clothing brand in Indonesia, Kawan. The research was conducted by understanding the external and internal factors using qualitative and quantitative methods. The internal data were from interviews with the owner of Kawan, customers and potential customers of Kawan. They were analyzed by the Valuable, Rare, Imperfectly Imitable, Organization (VRIO) and Marketing Mix (Product, Price, Place, and Promotion (4P)) framework. Meanwhile, the external factors were examined by the Political, Economic, Sociocultural, Technology, Ecological, Legal (PESTEL) framework and benchmarking. The data for PESTEL analysis were derived from news, reports, and an interview with the owner of Kawan. A survey was also conducted to women in Indonesia to formulate the marketing strategy using Marketing Mix framework. The results show the product characteristics for upcycling clothing brand and essential types of information for the promotion. They are essential in value creation and delivery for upcycling fashion brands. It is expected to contribute to the sales issue that Kawan has experienced and generate the marketing strategy for the issue.
Effect of Multi-Pass Rolling on the Performance of AZ31 Magnesium Alloy Anode in Mg-Air Battery
Authors: Zou Jinchao , Wang Junpeng , Huang Zhiquan , Zhang Tao
Published: April 2022

In this work, the influence of rolling passes on microstructure, corrosion behavior, electrochemical performance, and battery performance of AZ31 magnesium alloy was studied. The experimental results show that the grain size decreases first and then increases with rolling passes. Among them, the grain size of three passes rolled sample is the smallest, while the grain size of the four passes rolled sample is obviously refined and evenly distributed, accompanied by a small number of twins. Therefore, it exhibits more muscular discharge activity. In addition, the corrosion products of the four passes rolled samples are distributed loosely and evenly on the surface during immersion, which is easy to fall off, thus reducing the polarization. The surface of the discharged four passes rolled sample is flat, indicating that the dissolution is uniform, conducive to promoting the self-peeling of discharge products. The results show that the samples with four passes of rolling have high electrochemical activity and anode efficiency. The average cell voltage and anodic efficiency of the four passes rolled anode for Mg-air battery within 5 h at 10 mA cm-2 were 1.065 V and 56.4%, respectively. Therefore, the electrochemical performance of the four passes rolled sample is the best, and the process is more suitable for preparing magnesium alloy anode plate.
Stabilization of some classes of uncertain control systems with evaluation of admissible disturation for object matrix
Authors:   Institute of Problems of Mechanical Engineering of the Russian Academy of Sciences, Zuber Irina E.
Published: April 2022

Consider the system ̇x=M(·)x+enu,u=sTx, where M(·)∈Rn×n,s∈Rn, the pair (M·), enis uniformly controlable. The elements ofM(·)are nonlook-ahead functionals ofarbitrary nature. The object matrix is considering in form M(·) =A(·) +D(·), where A(·)has a form of globalized Frobenious matrix, D(·)is a matrix of disturbation. Consider thesquare Lyapunov functionV(x)with constant matrix of special form and number α >0 as estimate for ̇V for case D(·) = 0. The definition of such vectorsand such estimate ofnorm matrix D(·)that system is globally and exponentially stable are performed for every α >0.
On the choice of basic regression functions and machine learning
Authors:   St. Petersburg State University, Ermakov Sergey M. , Leora Svetlana N. ,   St. Petersburg State University
Published: April 2022

As is known, the regression analysis task is widely used in machine learning problems, whic hallows to establish relationship between observed data and compactly store of information. Most often, a regression function is described by a linear combination of some of the selected functions fj(X),j= 1, . . . , m,X∈D⊂Rs. If the observed data contains a random error, then the regression function restored from the observed data contains a random error and asystematic error depending on the selected functions fj. The article indicates the possibility of optimal selection of functions fj in the sense of a given functional metric, if it is known that the true dependence is consistent with some functional equation. In some cases (regular grids,s≤2), similar results can be obtained using the random process analysis method. The numerical examples given in this article illustrate much more opportunities for the task of constructing the regression function.
KAFA’S MONEY-CHANGING HOLE IN THE 13TH — 14TH CENTURIES
Authors: EMANOV Alexander G.
Published: April 2022

This Article addresses Origin of the Money-Changing Hole in Kafa in the 13th — 14th Centuries based on a wide Variety of Sources, public-legal Documents, notarial Deeds, public financial Registers, private financial Records, Trade Books, numismatic and archaeological Collections. In the Article reconstructed Activity of the Greek Trapeza and Trapezites, who specialized in the Exchange of Coins with Greek Writing, of the Levant Sarraf Yanseke and Sarrafs, in Charge of which has been Oriental Money Exchange, of the Italian Campsa and Campsors, who were responsible for Occident Coins. The Money-Changing Hole in Kafa was doing since the End of the 13th Century not only Exchange Money, but also Credit of the commercial Matters, torn into early Banks. One of the first Bankers in Kafa was Manfred, whose Name was not Italian, but German Origins, which meant “Man of World”, which reflected the cosmopolitan Character of the City.
VOLUNTEERS OF SPORT MEGA-EVENTS IN RUSSIA AND INDIA
Authors: Sukharkova Marina P. , Singh Narendra
Published: April 2022

The article is devoted to volunteers of major sporting events (sport mega-events) in Russia and India. The authors investigate the reasons that volunteers are guided by when deciding to participate in volunteering, their satisfaction from participating in the organization and holding of major sporting events, as well as their intentions to continue participating in volunteering practices in the future. In addition, the authors compare the motivation and future intentions of the Russian and Indian volunteers. The article also describes the reasons that, according to volunteers, hinder the development of volunteering in Russia and India.
Volunteering during sport mega-events is becoming more and more common. The work done by volunteers allows not only to solve many organizational issues, create the necessary atmosphere, maintain security, but also shapes the image of the host, the necessary mood for participants and spectators. The relevance of the article lies in the necessity for constant improvement of volunteer programs to increase the number of volunteers and to further maintain their retention in volunteer activities. In addition, the implementation of volunteer programs for the organization and holding of sport mega-events can contribute to the formation of a positive legacy in the field of volunteering and to the development of the nonprofit sector. However, this requires obtaining detailed information about the volunteers of these events, their motivation and satisfaction.
The empirical basis of the article is an online survey of volunteers of the European Football Championship and Indian volunteers of the Asian Boxing Championship. These events took place in Russia and India in 2021.
The article presents both Russian and foreign experience in sports volunteering. The scientific novelty of the article lies in the comparative approach to the study of participants in volunteer programs of sport mega-events.
DESIGN OF AN ANALYTICAL ACCOUNTING SYSTEM FOR INCOME AND EXPENSES OF A MANAGEMENT COMPANY IN THE HOUSING AND UTILITIES SECTOR
Authors: TOKMAKOVA Elena G. , Kosmacheva Anna Yu.
Published: April 2022

The peculiarity of the activities of housing and communal services management companies has a very significant impact on the organization of income and expense accounting. Various areas of activity, the variety and features of the services provided, the availability of VAT benefits for some of them require a special design of analytical accounting of income and expenses in order to obtain detailed reliable information necessary for effective management.
The methodology of the study is based on the generally accepted paradigm of understanding analytical accounting of income and expenses as a system for generating information necessary for managing an economic entity, with further development of the concept of detailing information about income and expenses based on updating this process according to the specifics and realities of the housing and utilities management company. Based on the analysis of theoretical research data and the practice of analytical accounting in LLC “Brusnika. House Management. Tyumen”, the authors come to the conclusion that it is necessary to deepen the analytical accounting of income and expenses of the housing and communal services management company.
The result of the study is the presented coding system of analytical accounts of management accounting for detailing information about income and expenses in the provision of services in the housing and communal services system. The proposed method of coding analytical accounts, with its practical application, will allow the formation of detailed information necessary for efficient management of the management company in various areas of their activity.
ECONOMETRIC ASSESSMENT OF RISK PREMIUMS IN THE RUSSIAN STOCK MARKET
Authors: OVECHKIN Danila V. , BOLDYREVA Natalia B.
Published: April 2022

Reasonable investing is impossible without assessing risk premiums. In finance, the following set of risk premiums is commonly used: market risk premium, size premium, value premium, profitability premium, investments premium and momentum premium. In addition, in the context of the current trend in the development of the global financial system towards responsible investment, a responsibility premium can be distinguished. The importance of studying responsibility premium in the Russian stock market is due to the desire of the Bank of Russia to transform it towards greater responsibility and introduce ESG factors into the activities of institutional and retail investors. The purpose of this article is to identify risk premiums that are statistically significant for the Russian stock market. The study period: from 01.12.2011 to 31.12.2020. As a result of applying the two-step econometric Fama-MacBeth procedure, which includes time series regression and panel regression, it is concluded that market risk premium and momentum premium (at the level of 1%), as well as profitability premium (at the level of 5%) showed statistical significance during the period under consideration. In addition, these premiums are positive. The remaining premiums, including responsibility premium, did not show statistical significance.
According to the results, only three premiums should be used when constructing asset pricing model in the Russian stock market. This result has practical implications in the context of investing in Russian stocks. An independent result is the assessment of responsibility premium for Russian shares. The statistical insignificance of responsibility premium allows us to make a reasonable assumption that the introduction of ESG factors into the activities of Russian institutional and retail investors will not reduce the effectiveness of their investment decisions.