bluuebunny/crossref_metadata_2025 huggingface dataset:
Implementation of Occupational Safety Principles in the Underground Mining of Complex Structure Ore Deposits
Authors:   Geophysical Institute of Vladikavkaz Scientific Center of the Russian Academy of Sciences, Vladikavkaz, Golik V.I. ,   Moscow Polytechnic University, Burdzieva O.G. ,   Geophysical Institute of Vladikavkaz Scientific Center of the Russian Academy of Sciences
Published: October 2023

Most of the metal ores are mined from the rock deposits by technologies with natural control of the state of rock massifs. Rationalization of the methods for controlling the state of an ore-bearing massif, considering their geomechanics, is becoming a priority direction for improving technologies for the development of complex structure ore deposits. The purpose of the study is to substantiate the possibility of managing the state of massifs based on the combination of filling mixtures in the conditions of the Sadon ore belt deposit. The complex of studies includes the engineering division of the massif with the allocation of engineering structural sections. By modeling on equivalent materials, a mechanism for the development of stresses in the vicinity of a working was established. It is determined that the studied massif is discrete with a gravitational-tectonic-structural stress field. Based on the experimental data, a model of the intensity of the ore-bearing massif is built on the basis of the hypothesis of wedging of the rocks of the bearing layer. The role of expansion stresses and backfill strength in the input of the massif into the volumetric compression mode is determined. A stress control technique is proposed by dividing the massif into geomechanically safe areas. It was proven that backfilling systems ensure the recovery of reserves, improve the quality of ores and preserve the earth surface, protecting the region from the negative impact of mining. The complexity of exploitation of ore-bearing massifs determines the need to monitor the geomechanics of ore-bearing rocks. The combination of technologies is a real step in improving mining production, as it allows to reduce ore dilution, increase labor productivity, and also improve the safety conditions of workers by increasing the reliability of technology parameters.
Ergonomic Factors and Operability of Operators of High-tech Industries
Authors:   Perm National Research Polytechnic University, Vishnevskaya N.L. , Liskova M.Yu. ,   Perm National Research Polytechnic University, Plakhova L.V. ,   Perm National Research Polytechnic University
Published: October 2023

Increasing labor productivity is the most important task of modern production. Approved methods of psychological (staff motivation) and economic (wage increase) nature increased productivity within 2–3 %. At the same time, improving the ergonomic characteristics of the workplace can increase productivity by almost 15 %. The material is presented on the search for ways to increase labor productivity based on the assessment of the performance and ergonomic components of the workplace of operators of high-tech industries. The ergonomic characteristics of workplaces are analyzed in detail, in the forced «sitting» position, a discrepancy with the anthropometric parameters of employees is revealed almost everywhere. The conducted studies showed that the monotony of the production environment and the work performed lead to the development of monotony syndrome among operators, which creates conditions for the erroneous actions and the risk of non-standard situations in production. Significant loads on the operator visual analyzer during the 12-hour shift are created by observing information on the 6–8 screens of monitors located on the wall in the observation area near each workplace. A material on the study of the state of body reactions during work shifts is presented. An assessment of the state of the physiological functions of employees showed that these features of the labor activity of operators create excessive loads on the body, but, including volitional efforts, activating attention, concentration, operators adequately perform work on managing the process, thereby increasing the physiological price of production activities. Prophylactic measures are substantiated to improve the workplaces of operators, organize intra-shift rest, protect the visual analyzer and prevent fatigue.
On the Effect of Increasing Air Pressure with Depth on the Calculation of the Required Amount of Air in the Deep Mines
Authors:   Mining Institute of the Ural Branch of the Russian Academy of Sciences, Olkhovsky D.V. , Zaytsev A.V. ,   Mining Institute of the Ural Branch of the Russian Academy of Sciences, Utkin N.N. ,   PJSC MMC Norilsk Nickel,   Norilsk Division, Darbinyan T.P. ,   PJSC MMC Norilsk Nickel, Davydov A.A. ,   PJSC MMC Norilsk Nickel
Published: October 2023

The effect of increasing air pressure with the depth on the calculation of the required amount of air in the deep mines is analyzed in the work. It is established that with an increase in air pressure, the values of the volumetric maximum permissible concentrations of toxic and explosive gases in it decrease, while their maximum permissible mass concentrations remain unchanged. Failure to consider the decrease in volumetric maximum allowable concentrations of toxic and explosive gases with depth when calculating the required amount of air in the mines in some cases can lead to an underestimation of air flow rates in working areas and, as a result, to an excess of maximum allowable concentrations of harmful gases. To move the same volume of air, local ventilation fans at great depths need to expend more power than at the surface. Therefore, when working at depth, it is required to use local ventilation fans with electric motors of greater power. When air is supplied to a greater depth, it is compressed and the volume flow decreases. Therefore, in order to maintain the required volumes of air at depth, it is required to increase its flow rate at the main fan installation. This should be considered when calculating the required amount of air in deep mines. The results obtained in the work can be applied in the design of deep mines and the development of methods for calculating the required amount of air for them. Based on the conducted research, the method was adjusted for calculating the amount of air used at the Glubokaya mine of the Skalisty mine of the Polar Branch of PJSC MMC Norilsk Nickel.
Biogas cogeneration plant on a dairy farm
Authors:   JP Elektroprivreda BiH, Termoelektrana Tuzla, Ćehajić Nurdin
Published: October 2023

The production and use of biogas to power a cogeneration plant is a cost and energy efficient way of disposing of organic waste generated by raising dairy cows. The stimulating legislative environment in BiH, the wide availability of technologies for the conversion of raw materials into biogas as well as the use of biogas in electricity and heat production, are the basis for considering the feasibility of building cogeneration plants on farms of different sizes. The biogas plant on the dairy farm produces biogas that is used in the cogeneration unit to generate electricity and heat. Based on the annual potential of biogas production, a cogeneration plant was dimensioned with all associated assemblies from the receiving pool of raw materials, fermenters with membrane for biogas storage, substrate pumping station and heating station for heating fermenters and farm facilities, cogeneration module (gas engine and generator). system and all parts of the pipe system with associated fittings, devices for analysis and purification of biogas, protection and regulation devices. The produced electricity is sent to the network and the thermal energy for heating the facilities on the farm and potentially for greenhouse production, drying processes and others.
Flammability characterizacion of biomass and coal mixtures
Authors:   Department of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, Madrid, Spain, León David , Amez Isabel ,   Department of Energy and Fuels, E.T.S. Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, Madrid, Spain, Manić Nebojša ,   University of Belgrade, Faculty of Mechanical Engineering, Fuel and Combustion Laboratory, Belgrade, Serbia, Stojiljković Dragoslava ,   University of Belgrade, Faculty of Mechanical Engineering, Fuel and Combustion Laboratory, Belgrade, Serbia, Medić Ljiljana ,   University of Belgrade, Faculty of Mechanical Engineering, Fuel and Combustion Laboratory, Belgrade, Serbia, Castells Blanca ,   TECMINERGY – Laboratorio Oficial Madariaga, LOM (UPM Technical University of Madrid, Spain), Getafe, Spain
Published: October 2023

The use of renewable energy has heavily increased in the last years due to climate change and global warning. Because of that, several countries have reduced the use of coal to produce energy, leading to abandon or disuse of multiple power plants. In this context, it is possible to adapt the power plant to use a mixture of coal and biomass as fuel in order to reduce coal consumption while keeping in operation these plants. In this context it is necessary to define the flammability parameters of the fuel mixture, in order to define possible new protection and prevention measures. The present study focuses on the flammability characterization of a coal and wheat straw mixture (80% and 20% respectively) through two tests: minimum ignition energy (MIE) and minimum ignition temperature of cloud (MITc). These tests were also performed in the raw coal and wheat straw in order to define how the mixture of both fuels might influence flammability parameters. From the results it was found that the mixture significantly reduced the MIE if compared to both materials, as the mixture presented a MIE of 170 mJ, while coal and straw 540 mJ and >1000 mJ respectively. On the other hand, MITc of the mixture was slightly increased if compared to straw (500ºC versus 480ºC) but decreased if compared to coal (640ºC). These results show the importance of analysing the flammability and explosion severity parameters of biomass and coal mixtures, as both materials influence each other, and equipment and facilities should be designed in accordance to the used fuel.
Challenges and opportunities for hydrogen as a viable aviation fuel of the future
Authors:   Univerzitet u Beogradu – Mašinski fakultet, Beograd, Ivanov Toni
Published: October 2023

One of the key elements for the decarbonization process could be the use of hydrogen in the energy sectors. The potential of replacing fossil fuels with sustainably produced hydrogen has been recognized long ago. Due to the rise of energy costs in recent years, the environmental impact of conventional fuels and achieved/foreseen technological advances in storage and transportation, hydrogen is becoming a more and more feasible solution as a primary energy source. European countries have established ambitious plans for the use of hydrogen as a renewable energy source. Many research projects have been financed by EU grants, while European Commission set a plan in March 2022 for a greater independence from fossil fuel imports, with the aim of producing 10 million tons of hydrogen, with 10 million tons intended for import by the year 2030. The use of hydrogen as a fuel source in the aviation sector has been considered a lot in recent years as well. The benefits of hydrogen as an aviation fuel are obvious. Hydrogen is sustainable, produces no harmful gas emissions, has a large energy density, etc. However, large technical difficulties still need to be overcome, challenging the placement of hydrogen as a viable aviation fuel source. Here, the most significant challenges, some possible solutions and the opportunities that arise from using hydrogen in aerospace propulsion are presented and discussed.
Green tehnologies – solutions for climat change adaptation
Authors:   ", Obradović Titomir ,   Expert - inženjering",   , d.o.o., Šabac, Serbia
Published: October 2023

The impacts of climate change are here and in force. In 2022 alone, several tragic records have been broken, and the trend towards more frequent, extreme weather events such as rainfall and flooding is becoming more apparent every year. Adaptation is necessary. Green innovation and technology have solutions to offer. However, it's not a matter relying on quick fixes and scaling up of a few major breakthrough solutions. It's instead a matter of developing and deploying thousands of solutions at all levels of sophistication. But it would also be wrong to believe that innovation and technology can solve everything. They cannot. Technology is no substitute for a broad range of fundamental and necessary changes to the way we produce and consume. Technology can help us tackle some of the worst impacts of climate change. And innovation is the key to unlocking technology's power to advance adaptation action. Innovation is key critical to developed and developing countries alike. It is fudamenial to sectors demanding creativity, ingenuity and 'thinking outside the box' to address the increasingly complex issues caused and exacerbated by climate change. As the most recent IPCC (Intergovernmental Panel on Climate Change) report states with high confidence, rising temperatures are a serious and mounting threat to human life, biodiversity and infrastructure. Each year that passes shows us that no country will escape the impacts of climate change.
Overboiled residue from biogas plants high-quality fertilizer
Authors:   Mašinski fakultet Istočno Sarajevo, Istočno Sarajevo, BIH, Simić Stojan
Published: October 2023

In biogas plants, the process of anaerobic digestion produces biogas and boiled residue – digestate. Biogas is used for the production of heat and electricity, and the digestate was used in agriculture. Digestate is a high – quality organic fertilizer that is used to enrich agricultural land. The paper presents the basic characteristics and advantages of digestate obtained in biogas plants compared to manure and artificial fertilizers.
Calculation of the connection between the pipe bundle and the tube plate of the heat exchanger according to JUS M.E2.259 (AD 2000) and SPRS EN 13445-3:2010 – comparative analysis
Authors:   Faculty of Mechanical Engineering, University of Belgrade, Serbia, Đorđević Lazar
Published: October 2023

This paper presents the calculation of the connection between the pipe and the tubesheet of the drum heat exchanger. Inserting the pipe into the tubesheet is the topic of the paper. A comparative presentation of calculations according to two different standards is given: JUS M.E2.259 (AD 2000) and SRPS EN 13445-3:2010. During the comparative analysis, the value of the thickness of the tube plate was taken as 14 mm, while the values ​​for the outer diameter of the tube were variable: 16 mm, 20 mm and 24 mm. Based on the above values, the loads of the pipe connection and the pipe plate were calculated.
Optimisation in the design of pressure equipment and its application during the use of pressure equipment
Authors:   PED Inspect, Beograd, Peseki Milan
Published: October 2023

Pressure vessels are an important part of process engineering. When it comes to production, almost every technological process contains equipment under pressure. Pressurized equipment is also used for storage and transport of substances that are in solid, liquid or gaseous aggregate state. The impact on environmental protection and sustainable development is an important aspect that affects the design of pressure equipment, due to the limited resources we get from the natural environment. In order to construct and design reliable and safe pressure equipment, while determining its minimum usable size, it is necessary to possess technical knowledge that is very extensive to understand this field of mechanical engineering and which should be given special attention when studying it. Ways of marking pressure vessels according to the rules that are in use and harmonized with the directives of the European Union. Recommendation for additional data for pressure vessel marking. Listing of 14 design calculation models applied to Heads for Pressure Vessels, with the possibility of visual comparison between calculation models and published technical regulations. Presentation of the author's calculation model for the approximate determination of the calculation thickness of the cylindrical shell, for vessels that have been made
The effect of silver nanoparticle shape on the physicochemical properties of a poly(n-isopropylacrylamide) hydrogel nanocomposites
Authors:   ", Spasojević Jelena ,   Vinca",   Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Beograde, Vukoje Ivana , Nikolić Nikolina , Tadić Julijana , Milošević Milica , Vodnik Vesna , Radosavljević Aleksandra
Published: October 2023

Hydrogels have unique properties and many potential applications, particularly in medicine and biotechnology. Gel porosity and swelling properties, stability, and biocompatibility are characteristics that are widely variable and easily adjusted. Stimuli-responsive or intelligent hydrogels are a class of these materials that shows a significant response to small changes in the surrounding environment. Poly(N-isopropylacrylamide) (PNiPAAm) is the best-known thermosensitive polymer with a well-defined volume phase transition temperature (VPTT) around 32°C. On the other hand, silver nanoparticles (AgNPs) have been the subject of intense interest due to their size-dependent optical, catalytic, and electronic properties as well as remarkable antimicrobial potential. Within the last decade, scientists have demonstrated that anisotropic AgNPs can be synthesized in a controlled manner and that these materials exhibit distinctively different physicochemical properties from their spherical counterparts. A significant challenge that scientists face is establishing how these nanoparticles can be used in a wider spectrum of practical applications. Therefore, we present a simple, straightforward two-step synthesis of AgNPs/PNiPAAm hydrogel nanocomposites that includes the chemical formation of both spherical and triangular AgNPs, followed by gamma irradiation-induced PNiPAAm crosslinking in the presence of nanoparticles. The gamma irradiation technique merges sterilization and synthesis in a single technological step, optimizing the process and opening up a wide range of innovative biomedical applications. The formation of stable and uniformly distributed AgNPs in the polymer was confirmed by UV-VIS spectroscopy, while the network porous sponge-like structure was observed by SEM analysis. Physicochemical characterization was performed by examining the swelling and deswelling processes in water at 25°C and 48°C, respectively. In addition, AgNPs were shown to have an effect on VPTT values. Our main goal is to investigate how different morphologies of AgNPs affect the physicochemical properties of nanocomposite samples, considering the potential applications and the ongoing need for the widespread use of biocompatible materials.
In vitro antioxidant activity evaluation of ferrocenyl chalcones
Authors:   Innovation Center of the Faculty of Technology and Metallurgy, Belgrade, Serbia, Lazić Anita , Matović Luka , Lađarević Jelena ,   Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia, Mašulović Aleksandra ,   Innovation Center of the Faculty of Technology and Metallurgy, Belgrade, Serbia, Gak Simić Kristina , Valentić Nataša ,   Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia
Published: October 2023

Ferrocene derivatives are known as antioxidants, antiparasitic, antitumor, antiviral, antibacterial and antifungal agents. In addition to applications in medicinal chemistry and drug design, ferrocene derivatives are of exceptional importance in synthetic organic chemistry, especially in catalytic asymmetric transformations. They are also used in electrochemistry and polymer chemistry, as additives in fuels, as chemosensors in agrochemistry and biosensors of glucose and active components in molecular electronics. To design new antioxidant agents, five ferrocenyl chalcones were synthesized, and fully characterized by melting points, FT-IR, 1H and 13C NMR spectroscopic methods. The synthesized chalcones differ in the nature and the position of the substituent attached to the phenyl group in position 1 of the linear unsaturated carbonyl system. The potential antioxidant activity of the synthesized compounds was evaluated using the ABTS (2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) method and IC50 values of the most effective compounds were further determined.
Calculation of the consumption of natural gas as a fuel for the baking process of brick products in an industrial tunnel furnace
Authors:   Visoka tehnička škola strukovnih studija u Zrenjaninu, Zrenjanin, Srbija, Salemović Duško , Lazić Matilda , Dedić Aleksandar ,   Univerzitet u Beogradu, Šumarski fakultet, Beograd, Halas Dragan ,   Visoka tehnička škola strukovnih studija u Zrenjaninu, Zrenjanin, Srbija
Published: October 2023

In this paper, the consumption of natural gas as a fuel for the process of baking of brick products in the burner of an industrial tunnel furnace, which commercial works in domestic company of the brick industry, was calculated. Natural gas with a predetermined composition is used as fuel for the operation of the tunnel furnace burner, that is, for the production of heat for heating and baking brick products. Natural gas is burned in the tunnel kiln burner. The parameters of the combustion process significantly influence the working conditions of the tunnel furnace and predetermine the quality of the brick products. The composition of the combustion products of natural gas with air was calculated; as well as the minimum required volume of air for complete fuel combustion in terms of the basic operating parameters of the tunnel furnace. Actual air temperatures at the entrance to the burner for natural gas combustion (in the tunnel furnace) were calculated based on the heat balance of the combustion process in the burner. As necessary, input variables for the calculation performed in this paper, the design data for the observed tunnel furnace and the corresponding physical sizes on the observed operating conditions of that tunnel furnace were used. The volume flow of natural gas through the burner was calculated from the equation of the general heat balance of heating and firing of brick products, set for the tunnel kiln. For the calculations, the corresponding physical sizes of the participants in the combustion process were used. The obtained value of natural gas consumption per unit mass of baked brick can be used as a basis for: quality determination of the industry process, the techno-economic analysis of the process of baking brick products in the existing tunnel kiln and at the same way to optimize the operation of the tunnel furnace.
Preparation of water for steam production in industrial steam boilers
Authors:   JP Elektroprivreda BiH, Termoelektrana Tuzla, Fejzić Jasmin , Buljubašić Indira ,   Mašinski fakultet Univerziteta u Tuzli, Ćehajić Nurdin ,   JP Elektroprivreda BiH, Termoelektrana Tuzla
Published: October 2023

In steam boiler plants, water is used to produce steam. A large number of damages and the resulting failures of thermal power plants are caused by the inadequate quality of the feed water. Water in its chemical composition also contains a large number of impurities that give it a very complex chemical composition. All admixtures have a detrimental effect on the safety of work and the degree of utilization of the steam boiler. That is why water, as the basic fluid in thermal power plants, needs to be purified by various mechanical and chemical processes before use, i.e. be subjected to adequate preparation in order to remove harmful impurities that negatively affect the operation of these plants and so that damage can be minimized and controlled. A series of technological procedures by which raw water is processed so that it obtains the properties prescribed by the conditions for the quality of feed water represent the preparation of feed water. This paper presents an example of preparation of feed water for industrial steam boilers in one plant.
Quality costs categorization in food safety management system according to PAF model
Authors:   Univerzitet u Beogradu, Fakultet organizacionih nauka, Beograd, Dimitrijević Sara , Ruso Jelena
Published: October 2023

Due to the increasingly complex business environment, frequent changes and greater competitiveness, companies in the food industry must assure high-quality products while minimizing their costs. Quality costs play a significant role as indicators of quality levels and, therefore, in the direction of improvements and quality that can lead to a reduction in overall quality costs. Quality costs are, in fact, the costs that arise when things are not done correctly the first time. Therefore, they can be minimized only when the optimum level of compliance is achieved. In the literature, the most represented is the PAF cost model, which divides quality costs into three categories: prevention costs, assessment costs and non-compliance costs. According to researches, greater investment in prevention and assessment costs leads to a decrease in overall costs. This paper aims to determine which categories of costs belong to the measures and activities within each requirement of ISO 22000:2018 Food safety management system - Requirements for any organization in the food chain, considering the wide application of this standard in the food industry and, also, preventive character of the standard, in conditions of adequate and inadequate fulfillment of requirements. The paper will present a detailed and systematic overview of the requirements of ISO 22000:2018, with a proposal of measures and effects of measures categorized according to PAF cost categories.The research included a literature review, and the contribution of the paper is the interpretation of the requirements of the ISO 22000:2018 standard from the aspect of categorizing quality costs.
Agile methodologies in the context of quality assurance in process industry
Authors:   University of Belgrade, Faculty of organizational sciences, Belgrade, Stefanović Vojislav , Đurić Mladen , Filipović Jovan
Published: October 2023

The paper examines the potential of agile methodologies in improving quality assurance in the process industry. The paper presents and explains quality management and assurance processes, key standards for software and process industries in the context of agile methodology implementation. Traditional project management with a focus on the waterfall method is briefly presented, as well as the advantages and disadvantages of traditional approaches. Agile methodologies are presented and a detailed description of selected agile methodologies, including Scrum, Kanban, XP, and Crystal Clear is provided. Furthermore the paper discusses the role and importance of quality assurance in agile methodologies and their application in the process industry. The conclusion of the paper highlights that agile methodologies can be an effective tool for improving quality assurance in the process industry. By adopting agile methodologies, the process industry can become more responsive to growing market demands, increase quality and productivity, and ensure that its products meet standards. The authors propose and advocate for the adoption of agile methodologies in process industries to enhance quality assurance.
Quality improvement based on optimization and automation of business processes
Authors:   Univerzitet u Beogradu, Fakultet organizacionih nauka, Beograd, Pantić Marko , Đurić Mladen , Ruso Jelena
Published: October 2023

Companies that deliver products and services do not usually have a clear picture of the processes within the company itself. Such an approach leads to a situation in which the company's growth is limited and the possibility of non-compliance increases significantly. In addition, a large number of organizations function without any sector, department, or at least an employee dealing with processes and management systems as a whole. The cause of such a phenomenon is an underdeveloped awareness of process management and the concept of quality as a company's primary activity. Therefore, in this paper, an analysis will be performed to show the impact of optimization and automation of business processes on quality improvement. Then, by reviewing the literature, an operational model will be generated to determine its impact on increasing the speed of business processes and reducing variations, process errors, and business costs.
LUNG DAMAGE ASSOCIATED WITH THE USE OF ELECTRONIC CIGARETTES AND VAPING IN CHILDREN AND ADOLESCENTS
Authors:   Perm State Medical University named after Academician E.A. Wagner, Perm, Perm Krai, Russia, Khuzina E.A. ,   Perm Krai Regional Children's Clinical Hospital, Perm, Perm Krai, Russia, Furman E.G. ,   Perm State Medical University named after Academician E.A. Wagner, Perm, Perm Krai, Russia
Published: October 2023

Electronic consumer products (devices, systems) made to delivering of nicotine-containing products are very popular among teenagers and children nowadays. There is a large amount of scientific research data and clinical cases describing the negative effects of electronic cigarettes on the respiratory system, primarily on the lungs. The components of e-liquids can cause inflammation, oxidative stress, infectious complications and disrupt the genetic apparatus of cells in the mucous membrane of the respiratory tract. Awareness and vigilance regarding the possibility of lung injury in heavy e-cigarette users is extremely important because, unfortunately, there are currently no effective ways to limit the distribution and the use of such kind of devices. The article represents bibliographical data on the pathogenesis, diagnostic capabilities and approaches to treatment of lung injuries associated with vaping.
CARDIOVASCULAR RISK FACTORS IN JUVENILE IDIOPATHIC ARTHRITIS
Authors:   N.P. Ogarev Mordovia State University, Saransk, Republic of Mordovia, Russia, Krasnopolskaya A.V. , Balykova L.A. ,   N.P. Ogarev Mordovia State University, Saransk, Republic of Mordovia, Russia, Samoshkina E.S. ,   N.P. Ogarev Mordovia State University, Saransk, Republic of Mordovia, Russia, Shirokova A.A. ,   N.P. Ogarev Mordovia State University, Saransk, Republic of Mordovia, Russia, Soldatov O.M. ,   N.P. Ogarev Mordovia State University, Saransk, Republic of Mordovia, Russia,   Mordovian Republican Children’s Clinical Hospital, Saransk, Republic of Mordovia, Russia, Shchekina N.V. ,   Mordovian Republican Children’s Clinical Hospital, Saransk, Republic of Mordovia, Russia, Tyagusheva E.N. ,   N.P. Ogarev Mordovia State University, Saransk, Republic of Mordovia, Russia
Published: October 2023

This systematic bibliographical review has a purpose of summarizing the current data on the presence of main cardiovascular risk factors, including the metabolic syndrome (MS) components, in children and adolescents with juvenile idiopathic arthritis (JIA). PubMed was searched for the keywords as follows: “juvenile arthritis,” “rheumatoid arthritis” and “cardiovascular risk factors,” “metabolic syndrome,” “dyslipidemia,” “arterial hypertension,” “obesity.” Thus, 90 original studies, meta-analyses, case series and clinical guidelines were included for analysis. The Authors’ own publications previously published on the topic were also in the list. The connection between the cardiac disorders and the MS in childhood, in particular, with the development of cardiovascular complications in adulthood is shown. The diagnostic criteria for MS and the prevalence of the complete MS signs (obesity, arterial hypertension, dyslipidemia, disorders of carbohydrate metabolism and insulin resistance) both in the general population and among adults and children with chronic inflammatory joint diseases are discussed. In addition to the traditional ones, the specific risk factors for cardiovascular diseases in patients with JIA are also considered, such as: rheumatoid cachexia, high inflammatory activity of the disease, side effects of antirheumatic drugs etc. The pathogenesis of metabolic disorders in JIA and the tactics for managing patients with an emphasis on non-drug methods of treatment are discussed as well.
PRE- AND PUBERTAL OBESITY AS A POTENTIAL PREDICTOR FOR POLYCYSTIC OVARY SYNDROME
Authors:   Rostov State Medical University, Rostov-on-Don, Russia, Moskovkina A.V. , Puzikova O.Z. ,   Rostov State Medical University, Rostov-on-Don, Russia, Popova V.A. ,   Rostov State Medical University, Rostov-on-Don, Russia, Churyukina E.V. ,   Rostov State Medical University, Rostov-on-Don, Russia, Kravchenko L.V. ,   Rostov State Medical University, Rostov-on-Don, Russia
Published: October 2023

Article represents analysis of domestic and foreign publications on the peculiarities of the meta-bolic syndrome in adolescent females and its impact on their reproductive function. Numerous dysfunctions of the endocrine system, from puberty to menopause, are closely associated with obesity. The high significance of diseases associated with obesity that manifest themself in child-hood determines the relevance of the research in the field. A clear understanding of the further tactics and strategy for managing girls with metabolic syndrome who are threatened by the de-velopment of polycystic ovary syndrome (PCOS), the need for an interdisciplinary approach with close cooperation between the endocrinologist, the gynecologist and the pediatric physician are the important factors for the successful implementation of reproductive function in the future. Keywords: obesity, hyperandrogenism, adolescents, girls, polycystic ovary syndrome, PCOS, ovarian dysfunction.
ASSESSMENT OF VITAMIN D SUFFICIENCY IN YOUNG ATHLETES
Authors:   Federal Scientific and Clinical Center for Children and Adolescents of the Federal Medical and Biological Agency of Russia, Moscow, Russia, Stolyarova S.A. , Okorokov P.L. ,   Federal Scientific and Clinical Center for Children and Adolescents of the Federal Medical and Biological Agency of Russia, Moscow, Russia, Zyabkin I.V. ,   Federal Scientific and Clinical Center for Children and Adolescents of the Federal Medical and Biological Agency of Russia, Moscow, Russia, Isaeva E.P. ,   Federal Scientific and Clinical Center for Children and Adolescents of the Federal Medical and Biological Agency of Russia, Moscow, Russia
Published: October 2023

Optimal vitamin D supplementation is necessary for the normal course of growth and develop-ment processes, bone formation, prevention of stress fractures, improvement of recovery after injuries and physical exertion in young athletes. There is a high prevalence of vitamin D deficien-cy in children and adolescents in Russia currently. The number of studies on the prevalence of vitamin D metabolic disorders in young athletes is insufficient. The purpose of this research was to assess the vitamin D availability in young athletes. Methods used: cross-sectional, single-center study included young athletes from 24 kinds of sports who underwent medical examination in March to July, 2022. Serum 25-hydroxycalciferol (25(OH)D3) was measured in all athletes using the chemiluminescence analysis. Results: 527 young athletes (254 (48.2%) boys/273 (51.8%) girls) aged 10 to 17 years and 11 months old (average 15.2 [14.2; 16.5] y/o) were examined. Vit-amin D deficiency (25(OH)D3 <20 ng/ml) was detected in 226 (42.9%) athletes, of which severe deficiency (25(OH)D3 <10 ng/ml) was in 5 (2%). Vitamin D insufficiency was diagnosed in 219 (41.6%), and the optimal level of 25(OH)D3 (>30 ng/ml) was detected only in 82 (15.5%). There were no statistically significant gender differences in the frequency of occurrence of vitamin D insufficiency (p=0.561) and deficiency (p=0.673). Conclusion: extremely low vitamin D availa-bility in young athletes was revealed. Conducting further research on the prevalence of vitamin D deficiency and ways to correct it in young athletes is necessary to start working on recommended optimizing and preventive and therapeutic approaches to correcting of the vitamin D levels in high-performance youth sports.
IMPACT OF AGE AND GENDER ON SPIROMETRIC PARAMETERS IN ADOLESCENTS WITH BRONCHIAL ASTHMA
Authors:   Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, Nizhny Novgorod, Russia, Gorbunova K.V. , Khramova R.N. ,   Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, Nizhny Novgorod, Russia, Eliseeva T.I. ,   Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, Nizhny Novgorod, Russia, Ovsyannikov D.Yu. ,   Patrice Émery Lumumba People’s Friendship University of Russia, Moscow, Russia, Krasilnikova S.V. ,   Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, Nizhny Novgorod, Russia, Tush E.V. ,   Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, Nizhny Novgorod, Russia, Kubysheva N.I. ,   Kazan and the Volga Region Federal University, Kazan, Republic of Tatarstan, Russia, Khaletskaya O.V. ,   Privolzhsky Research Medical University of the Ministry of Health of the Russian Federation, Nizhny Novgorod, Russia
Published: October 2023

Peculiarities of the course of bronchial asthma (BA) in adolescents from the standpoint of the influence of age and gender on it cannot be considered fully studied as yet. Materials and methods used: the data were obtained from 367 patients’ records of atopic BA aged 10 to 17 years old (73,6% boys) who were treated for atopic BA at the Nizhny Novgorod City Children’s Clinical Hospital No. 1 (Nizhny Novgorod, Russia). The patients were divided into two age groups: early adolescence (EA, 10 to 14 y/o, 239 patients) and middle adolescence (MA, 15 to 17 y/o, 128). All patients underwent spirometric studies with an assessment of the forced vital capacity of the lungs (FVC), the ratio of forced expiratory volume in one second (FEV1) to FVC (FEV1/FVC), the average volume velocity of forced exhalation, averaged in the exhalation interval from 25 to 75% FVC (FEF25-75). Spirometric parameters were evaluated using the z-criteria of the Global Lung Initiative. Results: in the general group of patients, the zFVC index was statistically significantly lower in MA compared to EA (p=0,001), and the indicators of zFEV1/FVC and zFEF25-75 were statistically significantly higher in MA (p=0,020, p=0,022 respectively). In the cohort of boys, there were similar differences in spirometric parameters in EA and MA (p=0,009, p=0,002, p=0,002, respectively). In girls, the values of FVC in MA were statistically significantly lower than in EA (p=0,0310, as in the general cohort and the cohort of boys). At the same time, in girls, the indicators of zFEV1/FVC and zFEF25-75, reflecting bronchial permeability, were slightly lower in MA than in EA, but the differences were not statistically significant. Conclusion: in boys, but not in girls, the spirometric parameters reflecting bronchial patency in MA were statistically significantly higher than in EA. At the same time, in both boys and girls, the indicators of FVC decrease in MA compared to EA, remaining above the population median values of indicators.
Husmear detrás de las máquinas para reencontrar la comunicación
Authors: Torrico Villanueva Erick R.
Published: October 2023

La transformación tecnológica y social que supone la transición de la "galaxia Gutenberg" a la "galaxia Internet" está afectando el ámbito del conocimiento positiva y negativamente. Si bien se ha avanzado en democracia centralizada y justicia social, también se ha establecido la sociedad de la desinformación y la posibilidad de un accidente tecnológico que nos afecte globalmente. En el ámbito geográfico de América Latina, la evolución de la infraestructura tecnológica ha permitido el desarrollo de las dinámicas empresariales y laborales, de la gestión y del consumo cultural, así como de la democracia electrónica, con la implantación del gobierno digital y el voto electrónico. No obstante, surgen cuestiones más problemáticas como la vigilancia electrónica, la delincuencia y el acoso digital, los nuevos procesos de concentración y acumulación de capital o los desequilibrios tecnológicos intra- e internacionales. En este marco, a pesar de su diversificación temática, el avance científico en el área de la comunicación se topa con la dificultad de lograr una reformulación teórica significativa que implique a la transformación digital, anclada actualmente a una concepción mediocéntrica y tecnocentrista.
Compressive Strength of Concrete Containing Expanded Polystyrene Styrofoam (EPS) Concrete and Partial Cement Replacement of Fly Ash and Silica Fume
Authors: Mohamad Mazizah Ezdiani
Published: October 2023

Expanded polystyrene (EPS) waste is generated by industry and post-consumer products. This is non-biodegradable, but is often disposed of by incineration or landfill, resulting in environmental pollution. Fly ash (FA) is a waste product from coal-fired power plants, and silica fume is a by-product of the smelting process in the production of silicon and ferrosilicon alloys. Both materials cause environmental pollution. Instead of disposing of them, there is a better way to put them to good use, such as EPS concrete (EPSC), by using EPS as a coarse aggregate and a mixture of fly ash and silica fume as a partial cement replacement. In this study, different mixes were investigated in which 100% of the coarse aggregate was replaced by EPS beads and the cement was replaced by a mixture of FA and SF at 20%, 25%, and 30%. Several laboratory tests were performed, including a slump test, a density test, a compressive strength test, and an ultrasonic pulse velocity (UPV) test. Based on the dataobtained, the optimum EPSC mix is EPSC3 (20% FA,5% SF) with 25% cement replacement and a compressive strength of 12.8 MPa at 28 days. The total slump of EPSC ranges from 65 mm to 173 mm and the total density ranges from 1562.6 kg/m3 to 1619.4 kg/m3.
Comparison of Different Surface Pre-Treatment on Mild Steel for Cobalt-Nickel-Iron Electroplating
Authors: Hyie Koay Mei
Published: October 2023

Electroplating is extensively practiced in the industry to fabricate corrosion-protective coatings for steel in large-scale production. Mild steel easily rusts at ambient temperature thus surface pre-treatment is mandatory to eliminate rust and superficial scale from the steel. Pre-treatment ensures that the steel surface is free from contaminants, which may interfere with the surface quality of the protective coating. This research is done to investigate the effect of different pre-treatment methods on the surface quality of mild steel rings and cobalt-nickel-iron coated mild steel rings. These surfaces were achieved by polishing the ring and subjected to alkaline degreasing, followed by immersion in sulfuric acid or sodium chloride at 10 vol % concentration and different immersion times (50 s, 55 s, and 60 s). Direct electroplating was applied to fabricate the cobalt-nickel-iron coating. The surface morphology of metal substrate and coating after electroplating were tested by scanning electron microscope (SEM), energy dispersive X-Ray (EDS), Vickers hardness, and surface roughness tests. Both types of pre-treatments provided lower surface roughness on the metal substrate and resulted in full coatings without voids formation. The results showed that pre-treatment using sulfuric acid exhibited higher hardness and a smoother coating surface. Agglomerates and cracking were observed on the surface coating treated with sodium chloride.
Via Vallen’s selection process as the local singer for Lead the Way film’s official soundtrack
Authors: Alamsyah Miranda Shafira , Hafiar Hanny , Kadarisman Ade
Published: October 2023

Background: Using celebrity endorsement to represent a brand can provide various advantages. However, if in selecting a celebrity endorser, the brand has not carried out the selection process correctly and precisely; then the brand can be threatened to face various risks due to celebrity endorsement tactics. Walt Disney Studios Indonesia experienced this in selecting Via Vallen as the singer of the localization song for the “Lead the Way” Official soundtrack. Purpose: This study aims to describe and analyze the selection process of Via Vallen. Methods: This study uses a qualitative approach with a descriptive type of research. Data collection techniques used are observation, interviews, and literature study. The data validation technique is done by using source triangulation. Results: The results showed that in the selection process of Via Vallen, the Walt Disney Studios Indonesia had carried out a series of selection stages as follows: market research, presentation, discussion to narrowing of candidates, meeting to final negotiations, and ending it with the signing of the contract. However, Walt Disney Studios Indonesia has not yet done the steps of contacting a PR agency to create an MPR campaign and proposing the use of celebrity endorsement tactics by the PR agency. Implications: Based on this research, it can be concluded that Walt Disney Studios Indonesia and similar companies could be more careful in choosing celebrity endorsers to represent brands to avoid disadvantages that could harm the brand. In addition, to strengthen this model, quantitative research can be carried out to see whether this model has a relationship with the success of choosing a celebrity endorser that can benefit a company.
Nakama: Reception on the Audience of One Piece Anime by Eiichiro Oda
Authors: Kharismawati Mery , Wahidati Lufi
Published: October 2023

Background: The theme of friendship in anime is often why an anime fan makes an anime title his/ her favorite. One Piece by Eiichiro Oda is an anime themed on the friendship of pirate crews. It aired on Indonesia’s private television station in the 2000s. In One Piece, the word “Nakama” is assumed to represent the sincere bonds of friendship offered by the character Luffy. But there’s also an assumption about the hidden meaning of making someone into their nakama. Not the one celebrated by the fans, but a reciprocal deed of a human being who needs another person’s help to reach their ambition. The assumption is up because One Piece fan who was touched by this character’s charisma also called themselves “Nakama.” Purpose: Find out the dominant, negotiation, and opposition regarding the scene of “Nakama” explanation by the character Nami in anime episode 102. Methods: This research used a qualitative method with a reception analysis approach by Stuart Hall. An in-depth interview was conducted with four informants who had been fans of One Piece since childhood and studied Japanese language and culture. Results: This research revealed that “nakama” has a biased meaning and does not only refer to “sincere friendship .”The informant’s answers were also influenced by their knowledge of Japanese culture learned in college and their everyday socializing experiences. Two informants are in the dominant hegemony position, and the rest are in a negotiation position because they have not found someone like “nakama” in the One Piece anime. Implications: Provide information about how the audience learning the Japanese language and culture view the meaning of “nakama” in their favorite anime and their view about friendship in real life.