Materials of International Practical Internet Conference “Challenges of Science”最新文献

Impact of aluminum content upon the microstructure of Ni-Cr-Al gradient coatings 铝含量对镍铬铝梯度涂层微观结构的影响

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.28

Maulet Meruyert, Wojciech Wieleba

引用次数: 0

Investigation of the possibility of introducing yttrium oxide by vacuum induction melting to produce nickel-free stainless steel 通过真空感应熔炼引入氧化钇以生产无镍不锈钢的可能性研究

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.30

F.E. Popov, A. Panichkin, N. Lutchenko, A. Arbuz

{"title":"Investigation of the possibility of introducing yttrium oxide by vacuum induction melting to produce nickel-free stainless steel","authors":"F.E. Popov, A. Panichkin, N. Lutchenko, A. Arbuz","doi":"10.31643/2023.30","DOIUrl":"https://doi.org/10.31643/2023.30","url":null,"abstract":"The possibility of smelting an oxide-dispersed strengthening steel alloy using five different approaches involving the introduction of finely dispersed Y2O3 particles into liquid Fe-13Cr steel alloy under vacuum conditions has been investigated. To achieve the objective, five series of experiments were carried out, each differing in the conditions and process of the experiments. Two series of melting, were performed to evaluate the possibility of mechanical introduction of yttrium oxide into the melt under different conditions of introduction. The subsequent three series, were carried out to study the possibility of oxidation of metallic yttrium in the melt with the formation of yttrium oxide particles. In these experiments such parameters as duration of melt holding time and residual pressure in the furnace chamber were varied. When the obtained ingots were analysed by X-ray fluorescence (XRF), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and energy dispersive X-ray spectroscopy (EDS), it was found that a significant amount of yttrium oxide was not successfully incorporated into the steel volume. A method using oxidation of metallic yttrium in the melt by reduction of added iron oxide was found to be the most promising.","PeriodicalId":264751,"journal":{"name":"Materials of International Practical Internet Conference “Challenges of Science”","volume":"45 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139272815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RANS modeling of the transition of a non-isothermal flow of a Newtonian fluid to a viscoplastic state in a pipe 管道中牛顿流体非等温流动向粘塑性状态过渡的 RANS 模型

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.13

A. P. Maksim, K. Z. Uzak

{"title":"RANS modeling of the transition of a non-isothermal flow of a Newtonian fluid to a viscoplastic state in a pipe","authors":"A. P. Maksim, K. Z. Uzak","doi":"10.31643/2023.13","DOIUrl":"https://doi.org/10.31643/2023.13","url":null,"abstract":"A mathematical model of the movement and heat transfer of a turbulent non-isothermal non-Newtonian fluid through a pipe wall with a cold surrounding space has been developed and simulated numerically. Fluid turbulence is described in the framework of the isotropic two-parameter k– model. The Newtonian properties of the fluid in the initial cross-sections of the pipe transformed gradually into a viscoplastic non-Newtonian Bingham-Schwedoff fluid state due to heat transfer through the pipe wall between the heated fluid and a cold environment. The value of its streamwise velocity in the axial zone increased significantly when the fluid moved along the pipe. On the contrary, it decreased in the near-wall zone and the height of the region with a zero fluid velocity increased. This occurred due to the viscoplastic properties of a non-Newtonian fluid. The height of the region with a zero fluid velocity in the pipe increased gradually as the non-Newtonian fluid (waxy crude oil) moved through the pipe. A noticeable increase in the level of turbulent kinetic energy in the axial zone of the pipe and its noticeable decrease in its near-wall region were observed. A significant increase in the average dynamic viscosity and yield stress in the near-wall part of the pipe was shown. The boundary of the area of existence of Newtonian properties of fluid was determined. The height of the region with a zero fluid velocity in the pipe increased gradually as waxy crude oil moved through the pipe and reached y/R ≈ 0.1 at x/D = 15.","PeriodicalId":264751,"journal":{"name":"Materials of International Practical Internet Conference “Challenges of Science”","volume":"34 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139272012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrating Continuing professional development with Education system reform in Kazakhstan 将继续职业发展与哈萨克斯坦教育系统改革相结合

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.03

M.B. Zharylkassyn

引用次数: 0

Trends and Network Analysis of Data Literacy in Various Fields: Bibliometric Analysis 各领域数据素养的趋势和网络分析：文献计量分析

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.24

Safitri Rina, Ramadan Syahri, Tuanaya Rugaya, Retnawati Heri

{"title":"Trends and Network Analysis of Data Literacy in Various Fields: Bibliometric Analysis","authors":"Safitri Rina, Ramadan Syahri, Tuanaya Rugaya, Retnawati Heri","doi":"10.31643/2023.24","DOIUrl":"https://doi.org/10.31643/2023.24","url":null,"abstract":"Data literacy has emerged as a key aspect in meeting the challenges of the evolving digital age. However, existing bibliometric analyses related to this topic are scarce. To fill the gap, this study uses a bibliometric approach to conduct a comprehensive review spanning nearly seven decades in order to assess the research landscape, progress, and emerging trends in data literacy. This article presents a new review of scientific production through an in-depth bibliometric analysis of the Scopus database using two software packages namely VOSviewer and RStudio. The article presents a synthesis of 2896 peer-reviewed articles from 1956 to 2023. Using keyword and co-occurrence analyses to identify key trends and relationships in research on this topic. Researchers highlighted the most researched concepts and the most important relationships between different publications. The analysis process was conducted by presenting the publication time, disciplinary area, scientific publications on data literacy, prolific authors, most cited publications, productive scientific countries, and keyword co-occurrence analysis on this topic.","PeriodicalId":264751,"journal":{"name":"Materials of International Practical Internet Conference “Challenges of Science”","volume":"43 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139273182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crystal Plasticity Finite Element Method (CPFEM): state-of-the-art 晶体塑性有限元法（CPFEM）：最新成果

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.19

Ahmad Gemeal

引用次数: 0

Exploring Pre-service Teacher’s Knowledge of Content and Teaching (KCT) and Computational Thinking: The Case of Addition and Subtraction 探索职前教师的教学内容与教学知识（KCT）和计算思维：以加法和减法为例

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.18

Y. Rakhmawati, H. Retnawati, S. Sugiman, G. Kassymova, G. Kudyarova

{"title":"Exploring Pre-service Teacher’s Knowledge of Content and Teaching (KCT) and Computational Thinking: The Case of Addition and Subtraction","authors":"Y. Rakhmawati, H. Retnawati, S. Sugiman, G. Kassymova, G. Kudyarova","doi":"10.31643/2023.18","DOIUrl":"https://doi.org/10.31643/2023.18","url":null,"abstract":"This research discusses the knowledge of content and teaching (KCT) and computational thinking (CT) of pre-service elementary school teachers on student work results. How much do pre-service teachers deepen students' thinking about the concepts of addition and subtraction? This research aims to get an overview of pre-service teachers' thinking about KCT and CT so that the results can be used to determine educational policies for developing human resource capabilities in elementary schools. The subjects of this research were three pre-service teachers at elementary school that selected by purposive sampling. The criteria for pre-service teachers are those who have taken basic concepts of mathematics, mathematics education, and mathematics development. The subjects in the low, medium, and high categories from state universities with A accreditation in Yogyakarta, Indonesia. The type of research is a case study. The research instruments namely the results of elementary school students ' work about addition and subtraction, then interview instruments to give an idea of how deeply they think about the material. The KCT’s findings are that pre-service teachers do not understand the Van De Walle concept of addition and subtraction, do not understand the prerequisites for addition and subtraction material, and pre-service teachers find unique ways of learning from students. In the CT component, there are two components that appear in them, namely pattern recognition and decomposition. An interesting finding was that pre-service teachers only learned about the Van de Walle technique after seeing the results of the work carried out by students. This means that previously they did not use those techniques at all. This picture shows that pre-service teachers' KCT and CT is still not optimal, so further, and in-depth research is needed to explore their understanding.","PeriodicalId":264751,"journal":{"name":"Materials of International Practical Internet Conference “Challenges of Science”","volume":"40 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139271714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of the flux composition effect on the removal efficiency of non-metallic inclusions in high-chromium cast iron 评估熔剂成分对高铬铸铁中非金属夹杂物去除效率的影响

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.36

A. Panichkin, B. Kshibekova

{"title":"Assessment of the flux composition effect on the removal efficiency of non-metallic inclusions in high-chromium cast iron","authors":"A. Panichkin, B. Kshibekova","doi":"10.31643/2023.36","DOIUrl":"https://doi.org/10.31643/2023.36","url":null,"abstract":"The problem to refine high-chromium cast iron melts obtained with the use of a large proportion of scraped metal and scrap is considered herein. Since fluxes containing calcium fluoride are currently considered to be environmentally polluting, it is required to reduce the use of fluorides, or completely replace them. It was shown that a decrease in the melting point of the flux can be achieved with the use of a mixture of calcium and magnesium fluorides or by the introduction of boron oxide into the composition of the fluxes. However, the efficiency of these fluxes, as well as silicocalcium additives and vacuum remelting in the high-chromium cast iron melting when a high proportion of scrap in the charge is used, has not been previously considered. In this regard, the effect of these refining methods on the removal of non-metallic inclusions in high-chromium cast iron of Grade 340Х18HML was experimentally assessed. Thermodynamic calculations were performed for the interaction of magnesium and calcium fluorides with non-metallic oxide inclusions typical of high-chromium cast irons and with oxides used for neutral lining of induction furnaces. It has been shown that fluxes based on boron oxide, magnesium and calcium fluorides and their mixtures effectively remove oxide and sulfide non-metallic inclusions; however, they have a destructive effect on the lining of furnaces, significantly reducing its service life. The addition of silicocalcium reduces the content of sulfides but does not affect the content of non-metallic inclusions in the form of oxides and nitrides. Vacuum remelting effectively reduces the number of nitride inclusions.","PeriodicalId":264751,"journal":{"name":"Materials of International Practical Internet Conference “Challenges of Science”","volume":"26 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139271439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Academic Research of the Protective Ability of Zinc-Filled and Epoxy Polyamide Paint Coatings against Atmospheric and Soil Corrosion 锌填充涂料和环氧聚酰胺涂料对大气和土壤腐蚀保护能力的学术研究

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.25

I.S. Duysembaev, R.Kh. Sharipov, D.K. Zhambakin, A. G. Didukh, N.A. Ivashov, D.B. Abdukhalykov, Negim El-Sayed

引用次数: 0

Bibliometric Analysis of Research Related to Digital Literacy Using the Scopus Database from 2017-2023 利用 Scopus 数据库对 2017-2023 年数字扫盲相关研究的文献计量分析

Materials of International Practical Internet Conference “Challenges of Science” Pub Date : 2023-11-15 DOI: 10.31643/2023.01

G.A. Begimbetova, H. Retnawati, A.A. Nogaibayeva, D.B. Sansyzbayeva, M.B. Triyono

{"title":"Bibliometric Analysis of Research Related to Digital Literacy Using the Scopus Database from 2017-2023","authors":"G.A. Begimbetova, H. Retnawati, A.A. Nogaibayeva, D.B. Sansyzbayeva, M.B. Triyono","doi":"10.31643/2023.01","DOIUrl":"https://doi.org/10.31643/2023.01","url":null,"abstract":"This research aimed to carry out a bibliometric analysis of research related to digital literacy using the Scopus-indexed articles database which was published from 2017-2023. To collect data, the author used a document Analysis or documentation instrument, and a sample of collected 665 articles from the Scopus publications was obtained through the application of the saturated sampling technique. The data were analyzed through the R Program Biblioshiny package. The first finding is that a steady rate of publications in the field of digital literacy was observed from 2017 (68 articles) up to 2022 (131 articles). The second finding is that keywords like “e-learning”, “digital literacies”, and “students” have higher bibliographical coupling indexes of 29, 26, and 23 respectively. For the third finding, the concepts of “e-learning” and “information literacy” are very important terms within their network. Besides, authors whose works had much attention have included “e-learning”, “digital storage,” “computer science”, “digital environment”, “education”, “curricula”, and “students” in their words. Based on these findings, the main recommendation is for researchers to make further investigations in order to discover why works including the keywords like “e-learning”, “digital literacies”, and “students” are mostly cited.","PeriodicalId":264751,"journal":{"name":"Materials of International Practical Internet Conference “Challenges of Science”","volume":"406 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139274653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0