bluuebunny/crossref_metadata_2025 huggingface dataset:
Efficacy in developing a Sustainable, Resilient, and Interdependent Infrastructure System in the Gulf Region
Authors: Mohamed Mohamed G. , Kevin Muiruri
Published: October 2023

The world is becoming increasingly interconnected, and the exchange of information, knowledge, and services assists in developing and managing many aspects of the built environment. Sustainable, resilient, and interdependent development of infrastructure emphasizes relationships among systems with benefits of creating one system-of-systems that includes enhancing the delivery of primary services, increasing systems efficiency in performing more than one function, exchanging benefits between systems, sharing information among systems, reducing carbon emission, eliminating waste, enhancing the operation of all systems, and reducing the cost of developing, managing, operating, and maintaining them. Infrastructure development in the Gulf region presents many challenges, such as excessive use of scarce natural resources, limited areas of development, and high cost of development, operation, and maintenance in each system. This study addresses the importance of developing a sustainable, resilient, and interdependent infrastructure system that can work with the natural processes and flows and respond to challenges specific to the Gulf Region. Its findings will guide decision-makers in the appropriate choices and the economic, environmental, and social opportunities in developing an integrated and efficient one-system network. Relationships between infrastructure systems, such as simple, colocation, or geographical relationship, and an integrated relationship in the Gulf region will be compared with other relevant international projects. Data from project-specific literature and case studies were used to carry out this study.
Sustainable Alternatives for Concrete by adding Different Types of Natural and Industrial Waste Materials
Authors: Lakys Rana Ezzdine , Yassin Mohammad Hany , Jumaah Adel
Published: October 2023

The construction industry accounts for a high percentage of global energy-related CO2 emissions (37 % in 2021 based on data from United Nations Environmental Program - UNEP) leading to an increasing need for solutions to aggressively reduce the energy demand in the built-up environment. Previous research showed that adding natural fibers such as Palm Tree Fronds (PTF) enhances the thermal behavior of concrete but may have negative effect on its mechanical properties as it may dramatically reduce its compressive strength and hence its durability. The work conducted previously by the authors confirms the research findings for different grades of concrete. Therefore, the possibility of adding another type of waste to compensate the compressive strength of concrete was explored. This additional material was chosen based on environmental consideration and the solution of adding Ceramic Waste Powder (CWP) was adopted. According to literature review, adding CWP may enhance not only the mechanical resistance of concrete but also its workability and its resistance to segregation. In this aim, different groups of mixes are performed to obtain the optimal mix for a high strength sustainable concrete: Control mix, CWP mix where CWP was added to replace 33% of the cement mass, and (CWP+PTF) mix where CWP (33% of the cement mass) and PTF (0%, 0.5% and 1% of sand volume) were added to the mix. The results of the compressive strength at early age (1 day) showed that the best results were obtained for the (CWP + PTF) mix with 0.5 % of added PTF.
Identification of Karstic Features with Extensive Geophysical Investigation for Underground Infrastructure - South of Wakrah Pumping Station and Outfall (SWPSO) Project
Authors: Akbar Ali , Dafalla Fathelrahman , Krishnamurthi Ilayaraja Kumba , Candia Andres E. Pinto
Published: October 2023

There has been a significant increase in the number of underground infrastructure projects built in a short period because of Qatar's goal of effective mass transit and robust urban drainage infrastructure, as well as the country's recent fast urbanization and harsh weather events. The Doha Metro, the Inner Doha Re-sewerage Implementation Strategy (IDRIS), and most recently the Doha South Terminal Pumping Station (DSTPS) and the Musaimeer Pumping Station and Outfall (MPSO) projects faced difficulties in identifying and quantifying the Karstic features and the remedial approach for underground works to ensure the completion of the projects on schedule and within budget due to the unknown ground conditions. One of the most important risks for underground construction in Qatar is the presence of karst environments, which are concentrated mainly within the limestone, dolomite, gypsum, and anhydrite horizons of the Eocene strata. The proper assessment of Karstic features requires an appropriate selection of geophysical methods and a high level of skills and expertise to interpret the data. To do so, a comprehensive geophysical survey campaign was deployed at the early stages of the project's execution to identify the Karstic features of concern associated with subsurface conditions at shallow and deeper depths up to 80 meters below ground level. This paper presents an example of a recently developed geophysical investigation program for the pre-tender design of the South of Wakrah Pumping Station and Outfall project. The project team carried out a comprehensive geophysical study to identify the Karstic features of concern along the tunnel alignments, shaft locations, and at the pump station area. Most of the identified Karstic features are categorized as low risk, but there was a high-risk anomaly (cavern) identified, and the extent of this cavern was verified with well-known geophysical methods like Multichannel Analysis of Surface Waves (MASW), seismic refraction, and 3D crosshole seismic tomography.
Galvanized Steel as a Sustainable Material-Technology and Failure Analysis
Authors: Ibrahim Abdulwahab , MacIntyre Scott
Published: October 2023

The building industry is responsible for 40% of global CO2 emissions and 36% of global energy consumption. Therefore, it is not surprising that the industry is motivated to embrace more environment-friendly procedures and turning to more environment-friendly materials and manufacturing processes. Driven by ever-stricter environmental norms and regulations, as well as rising costs, galvanizing is considered as an affordable, again, an environment-friendly and 'green' corrosion protection method. In order to prevent corrosion and produce a tough, long-lasting surface, clean steel is coated with a layer of molten zinc during the hot-dip galvanizing process. It has the extra benefit of completely covering the steel, making it more durable than conventional coatings that just adhere chemically or mechanically. As a result, it is not only very efficient but also very environment-friendly. A single, one-time treatment will completely coat a product's interior and exterior, giving it a coating that can shield steel and keep it from needing maintenance for more than 70 years. In this paper, galvanizing will be introduced as an efficient, affordable, and environment-friendly anti-corrosion method. Technical issues related to the process are presented and challenges associated with galvanizing are addressed. The experimental part includes measuring the zinc coating layer using optical microscopy. Failure cases related to galvanized structures which include bridges, bolts, and fire affected monopole are discussed, root causes were analyzed, and recommendations are provided.
Performance of Mild Steel and Corrosion-Resistant Steel Rebars in Chloride-Contaminated Concrete
Authors: Sohail Muazzam Ghous , Al Nuaimi Nasser , Alnahhal Wael , Kahraman Ramazan
Published: October 2023

Reinforced concrete (RC) infrastructure in Arabian Peninsula is subjected to harsh climatic conditions of high temperatures, humidity, and airborne chlorides and there is a high concentration of salts in seawater and soils. These factors instigate corrosion of reinforcing steel in RC infrastructure at the early stages of the service life. To overcome the durability issues of RC infrastructures, corrosion-resistant reinforcing bars are employed. In this study, a comparison of microcell and macrocell corrosion of mild steel (MS) and two types of corrosion-resistant rebar namely the high chromium (HC) and stainless steel (SS) was established. Nine concrete block samples of 20x10x350 mm were cast with top rows of reinforcements, the top row consists of MS, HC, or SS, and the bottom row contained only SS. Blocks were conditioned under 3.5% NaCl for 2 years and linear polarization resistance and macrocell currents were evaluated to compare the corrosion performance of mild and corrosion resistant steel rebars. It was observed that SS is the most corrosion-resistant steel rebar, where high chromium steel showed up to three times more corrosion resistance than mild steel under chloride attack.
Bio-Based Self-Healing Concrete for Sustainable and Durable Concrete Infrastructure
Authors: Sohail Muazzam Ghous , Al Nuaimi Nasser , Kahraman Ramazan , Al Disi Zulfa , Zouari Nabil , Genturk Bora , Rodrigues Debora F. , Yildirim Yucel
Published: October 2023

In this study, bio-self-healing concrete was manufactured using a natural phenomenon called microbial-induced calcium carbonate precipitation (MICP). The bacillus cereus bacteria isolated from Qatari soil was used for this purpose. These bacteria have endured the harsh weather of high temperatures, humidity, and alkaline soil conditions. Hence, are a potential candidate for long-term self-healing in concrete structures that are subjected to the climate of the Middle Eastern region. The bacteria were encapsulated in sodium alginate beads then the beads were added to the cement-sand mortar. The nutrients for bacteria such as urea, calcium nitrate, yeast extract, and calcium chloride were mixed in mortar as dry constituents. After curing for 28 days, cracks were artificially induced in the prismatic samples, which were reinforced with steel rebars at the tensile side. Samples were placed in water to instigate self-healing. It was observed that the bacteria healed the cracks up to 0.70 mm. It is concluded that the used bacteria are viable in the alkaline concrete matrix and capable of producing calcium carbonate.
Effect of Chemicals on Compressive Strength of Plastic-Laterite Interlock Paving Blocks
Authors: Liman Mubarak L. , Yamusa Yamusa Bello , Danjuma Bilkisu , Sani Abubakar , Walliyullah Yusuf
Published: October 2023

This research centres on the need to develop a simple but sustainable material for the utilization of the quantum of plastic wastes that litter our environment. The research uses waste plastics and laterite soil and converts them into construction materials (interlock blocks) with the help of the densifier, thereby reducing the plastic waste, which is a key contributor to environmental pollution. Literature has shown that concrete structure is prone to chemical actions; the durability of conventional concrete bricks gets affected by chemical effects. The chemicals may cause cracking of concrete, rutting, and deterioration of the structure. In the same vein, the plastic-laterite interlock bricks might not be free from such defects due to chemical action. Therefore, this research looks into the effects of different chemical curing conditions on the compressive strength of plastic-laterite paving blocks. Varying proportions of plastic wastes and laterite soil were mixed and processed into composite bricks and subjected to different chemical treatments; in acid, base, oil, and water for 3, 14, and 28 days relative to a concrete brick control. It was observed that samples cured in acid solution gave the lowest compressive strength, while those in base solution gave the highest. The paving interlock blocks made from polyethylene/laterite composite registered relative performance compared to concrete interlock bricks control. If made and put into use, these blocks will reduce construction costs, assist in environmental sustainability and improve circular economic growth. Therefore, using this innovative approach will bolster infrastructural projects and checkmate plastic pollution within our environment.
Optimum Design of Plane Trusses Using Mathematical and Metaheuristic Algorithms on a Spreadsheet
Authors: Plevris Vagelis , Elias Ismail Hafez Mohammed , Charalampakis Aristotelis E.
Published: October 2023

Mathematical optimization refers to the process of finding the values of variables that maximize or minimize a function. Structural optimization is the process of designing a structure in such a way as to minimize its weight or cost, while meeting a set of performance requirements, ensuring that it is robust, lightweight, and efficient. Two large categories of optimization algorithms are mathematical and metaheuristic algorithms. The ones of the first rely on mathematical principles, are deterministic and exact but may fail if the problem is too large or complex. The latter category, metaheuristics, represents algorithms that are used to find approximate solutions. They are high-level strategies that guide the search toward a good solution, rather than being a specific, deterministic algorithm. They are often used for problems where it is difficult or impractical to find the optimal solution using exact methods. Metaheuristics typically involve iteratively improving a solution through some type of search or exploration process. They make use of techniques from probability and statistics, such as randomization and stochastic optimization, to explore the search space and guide the search toward good solutions. Some examples include genetic algorithms, simulated annealing, differential evolution (DE), particle swarm optimization (PSO), and ant colony optimization. In this study, a mathematical optimizer and two metaheuristics (DE, PSO), are employed for the optimum structural design of plane truss structures aiming to minimize the weight of the structure under constraints on allowable displacements and stresses. A 10-bar plane truss is considered as the numerical example of the study. The constraints are checked by performing an analysis with matrix methods. All calculations are done on a spreadsheet. The results of the algorithms are compared to each other as well as to results from the literature in terms of convergence speed, number of function evaluations, and accuracy of the solution.
Blockchain and its Potential in the Digitization of Land and Real Estate Property Records
Authors: Plevris Vagelis , Abdallah Hassan , Alnatsheh Azzam
Published: October 2023

A blockchain, is a decentralized digital ledger that is distributed across multiple computers, recording transactions in a way that cannot be altered without the consent of the network and the alteration of all subsequent blocks. In the context of land and real estate property records, a blockchain could be used to securely and transparently track the ownership and transfer of properties. Using a blockchain to digitize land and real estate records can have several benefits. For example, it can help reduce the risk of fraud, as all transactions are recorded on a secure and tamper-proof ledger. It can also make the process of transferring ownership more efficient, as it can automate many of the steps involved and reduce the need for intermediaries. Additionally, a blockchain can increase the transparency of the property market, as all records will be publicly available on the ledger. In this work, we examine the current situation and the related problems in registering land and real estate property records, especially in developing countries, and we state the challenges and opportunities of the application of blockchain technology in this field. We investigate whether blockchain has the potential to bring a positive change and play a significant role in the real estate market in the future and what are the prerequisites to achieve that.
Enhancing the Bond Durability of Basalt Fiber Reinforced Polymer Bars Using Basalt-Macro Fiber Reinforced Concrete
Authors: Taha Alaa , Alnahhal Wael , Alnuaimi Nasser
Published: October 2023

This paper presents a study about the bond durability of basalt fiber reinforced polymers (BFRP) bars embedded in concrete incorporating basalt macro fibers (BMF) when conditioned in harsh saline environment at 60 °C. A total of 24 pullout specimens were tested to investigate the influence of concrete type (plain concrete and fiber reinforced concrete) and duration of conditioning (30, 60 and 90 days). The basalt-macro fiber reinforced concrete (FRC) incorporated BMF at 0.5% fiber volume fraction. The BFRP bars used had helically wrapped surface treatment. Moreover, the bond durability was assessed based on bond-slip behaviour, bond degradation, and service life predictions of bond strength retentions after 50 years of service life. The experimental results revealed that BFRP bars embedded in basalt macro FRC showed higher bond stiffness compared to those embedded in plain concrete. Additionally, BFRP bars embedded in basalt macro FRC showed slower bond degradation than their counterparts embedded in plain concrete. Finally, FRC increased the bond strength retentions of BFRP bars based on 50 years’ service life predictions when compared to plain concrete.
Synthesis of Calcium Nitrate Self-Healing Microcapsules Using Aerosol OT-Hexane Solution for Cementitious Materials
Authors: Abu Taqa Ala , Suleiman Ghassan , Senouci Ahmed , Mohsen Mohamed O.
Published: October 2023

Calcium nitrate synthesis of in urea-formaldehyde shell has recently been used to produce self-healing microcapsules for construction applications. The original synthesis was based on water-in-oil emulsion with sulfonic acid as fundamental ingredient of the oil (continuous) phase. It has been modified herein by changing the composition of the continuous (oil) phase by mixing anionic surfactant, Aerosol OT (AOT) with hexane to prepare the solution while keeping the aqueous phase unchanged. The submicron refined calcium nitrate microcapsules. In order to characterize the microcapsules encapsulated using the aforementioned, procedure, a Scanning Electron Microscopy (SEM) was utilized. The obtained microcapsules had satisfactory diameter and shell thickness. To assess the effect of the prepared microcapsules on the compressive and flexural strengths, mortar mixes containing 75% microcapsules (by weight of cement), as an introductory dosage, were made. It has been demonstrated that incorporating the self-healing microcapsules prepared using the procedure suggested in this study did not cause significant reductions in the mortar samples' strengths. Hence, the encapsulation methodology presented here may be utilized to investigate their self-healing efficiency in cementitious materials.
Assessment of the Current Frequency Calculation Methods Used in the Determination of the Dynamic Modulus Value in Pavement Design and Analysis
Authors: Alfarra Mohammed A. , Sadeq Mohammed , Sadek Husam
Published: October 2023

The dynamic modulus |E*| is used in the Mechanistic-Empirical Pavement Design Guide (MEPDG) to express the viscoelasticity of asphalt material at a range of temperatures and loading frequencies. As a result, the current MEPDG method assumes that frequency is calculated as the opposite of vehicular loading pulse time. In addition, the loading pulse time can be calculated using the Odemark thickness equivalency method according to the MEPDG. On the other hand, the loading frequency as per Qatar Highway Design Manual (QHDM 2021) is estimated based on the average vehicle speed using Losa and Di Natale formula. However, studies found major inadequacies in the adopted method of MEPDG, which might affect the accuracy of the loading frequency and |E*| accordingly which leads to an impact on the pavement design and performance analysis. Hence, it was recommended that alternative frequency determination approaches like the Fast Fourier Transform (FFT) be used rather than traditional time-domain techniques. Therefore, this paper compares the results of the MEPDG and QHDM loading frequency procedure with the dominant frequencies (DF) obtained using the FFT. On the other hand, the loading time pulses are estimated using the Odemark approach and, compared to the ones simulated using 3D Move Analysis software that accurately considers the tire contact pressure, viscoelastic properties, & vehicle speed. It was found that the used frequency determination approach in the pavement design in Qatar, overestimates the frequency values by about 30% to 88%. Furthermore, the findings showed that the MEPDG method for determining loading time and frequency is not conservative.
Development of a Comprehensive Pavement Design System for Roads in Wind and Solar Farms
Authors: Santagata Ezio , Sebaaly Haissam , Capozzi Vittorio
Published: October 2023

This paper briefly, illustrates the structure and contents of an ongoing research program aimed at developing a set of procedures and tools to be used for the design of pavements in renewable energy projects and mainly in wind and solar farms. Challenges related to this topic derive from the non-standard nature of several factors that affect the structural and functional performance of such pavements, with the consequent need of employing purposely defined prediction methods, design criteria and specifications. Further crucial aspects to be taken in account in the research program are related to the life cycle cost analysis of pavements, to be carried out in a multinational context by considering alternative scenarios according to an OPEX (operating expense) versus CAPEX (capital expenditure) philosophy. It is envisioned that results and deliverables of the project will contribute to the enhancement of the effectiveness of operations in wind and solar farms, optimizing investments and leading to the selection of more sustainable pavement solutions.
R&D Expenditures and Firm Valuation according to Firm Life Cycle, Technology Level, and BM Ratio
Authors:   Korea Accounting Information Association, Ahn Soo-geun , Moon Hyoung-koo , Park Won-koo
Published: October 2023

[Purpose] This study aims to empirically test whether the relationship between R&D expenditures and firm value depends on firm characteristics such as firm life cycle, technology level, and future growth prospects. Through this study, we also verify the effectiveness of R&D expenditures as an index of firm value evaluation.
[Methodology] The research model is a modified version of the Ohlson model (1995), and 13,720 financial data of Korean listed firms extracted from KIS－VALUE and TS－2000 are used as samples. The technology level of the firms is classified by Eurostat Indicators, and the future growth prospects are classified according to the book－to－market ratio (BM ratio).
[Findings] First, when analyzing all firms, we find that growth－stage R&D expenditures are more value－relevant than mature－stage R&D expenditures. However, when firms are divided into four groups (2×2) based on technology level and future growth prospects, we find that growth－stage R&D expenditures are more relevant to firm value than mature－stage R&D expenditures, only the group that satisfies at least one of the high－tech firms or firms with good future growth prospects. For non－high－tech firms and those with poor future growth prospects, there is no significant difference in the value relevance of growth－stage versus mature－stage R&D expenditures. Second, for all firms in the growth stage, we find that R&D expenditures have a greater impact on firm value than net income. Third, when dividing the growth stage firms into four groups (2×2) we find that R&D expenditures is more relevant to firm value than net income only for high－tech firms with good future growth prospects. In conclusion, R&D expenditures is a valid valuation indicator, and its relevance to firm value is higher for high－tech firms that are in the growth stage and have good future growth prospects.
[Implications] R&D expenditures can be more effective valuation indicator when used in conjunction with the life－cycle stage, technology level, and future growth prospects (BM ratio) indicators. In addition, R&D expenditures can be useful in explaining the growth stock effect, in which high－tech firms in the growth stage or firms with good future growth prospects have market capitalizations that are higher than their underlying value.
A Tea Culture Therapy Program for the Successful Aging of the Elderly
Authors:   The Korean Tea Society, Kim In-Sook
Published: October 2023

In a super-aging society, it is essential to develop programs that can help the elderly lead a healthy and happy life and to overcome their problems with a proactive and positive response. Accordingly, a tea culture treatment program was developed to promote successful aging among the elderly. To verify its effectiveness, the program was conducted for 10 men and women aged 65 or older who used the S Senior Welfare Center in P city. The successful aging scale scores of the elderly participants were measured before and after their participation in the program. As per the results, the overall successful aging score pre-session mean (pre-mean) was 3.62 (SD 0.32) and the post-session mean (post-mean) was 3.84 (SD 0.24), confirming a significant difference. For each sub-domain that constituted successful aging, the pre-mean autonomous life score was 3.90 (SD 0.28), and the post-mean was 3.99 (SD 0.24). The self-completion orientation score had a pre-mean of 3.28 (SD 0.62) and a post-mean of 3.50 (SD 0.46). The active life participation score had a pre-mean of 3.72 (SD 0.42) and a post-mean of 3.96 (SD 0.30). The pre-mean of satisfaction with children was 3.76 (SD 0.36) and the post-mean was 3.90 (SD 0.42). The self-acceptance score had a pre-mean of 3.73 (SD 0.31) and the post-mean was 4.03 (SD 0.29). The score of acceptance of others significantly improved from the pre-mean of 3.30 (SD 0.69) to the post-mean of 3.63 (SD 0.40). The above results show that the tea culture treatment program for the elderly was significantly effectively improved successful aging of the elderly participants in this study. Therefore, it can be concluded that the tea culture therapy program for successful aging of the elderly developed in this study had a positive impact on aging.
Professed vis-à-vis Enacted Knowledge: Topic-Specific Pedagogical Content Knowledge of University Mathematics Teachers
Authors:   The Korea Society Of Educational Studies In Mathematics, Kasa Yosef , Areaya Solomon , Woldemichael Mulugeta
Published: October 2023

This study aimed to determine and observe the topic-specific pedagogical content knowledge of university mathematics teachers before and during limit and continuity concept instruction, and compare the teachers’ perceptions of their teaching to what happened in their classrooms using the case study method. The study involved five university mathematics teachers who teach ‘Applied Mathematics I’ to pre-engineering students at Assosa University, Ethiopia. Classroom observation sessions and pre-lesson teacher interviews were used as data sources. The data were analyzed by identifying common themes in each of the knowledge components prior to and during the lesson, and then by comparing the two phases. The findings from the teacher cases provided detailed contextual information and revealed knowledge manifestations in their lesson design and actual teaching processes. The study’s findings revealed that teachers had a good understanding of topic-specific pedagogical content knowledge components prior to the lesson, but did not demonstrate most of these in their actual teaching of limit and continuity; their reported and enacted knowledge differed. According to this study, individual teachers varied in their implementation of what they had mentioned about various components of topic-specific pedagogical content knowledge. The study proposes that understanding teachers’ knowledge during the lesson design phase and actual teaching could help fill the gap as a means of professional development, and thereby, improve pre-engineering students’ mathematics learning.
Exploring the Experience of Pre-Service Mathematics Teachers in the Practicum Semester System
Authors:   The Korea Society Of Educational Studies In Mathematics, Kim Somin , Kwon Na Young
Published: October 2023

This study examined the experiences of secondary pre-service mathematics teachers in the first pilot operation of the school practicum semester system and sought implications for the enlargement of the system. The education trainees who participated in the study were three female students in the 4th year of the Department of Mathematics Education at the time of the research, and conducted a school practicum for 19 weeks. The data used in the study include mentoring data from trainees and advisors, records from the midterm evaluation meeting, satisfaction survey data from the final evaluation meeting, and focus group interview data after practicum. The results of this study were divided into three categories: experiences through school practicum (curriculum guidance, school educational activities, student guidance, assessment, training, and work), learning from school practicum (class design and implementation, teaching aptitude, understanding students), and difficulties (simultaneous college classes, preparation for school classes, class discontinuity, and preparation for Teacher Qualification Test). Finally, practical suggestions for the enlargement of the system are discussed.
Research Trends in the Ill-Structured Problem-Solving of Mathematics Education in Korea
Authors:   The Korea Society Of Educational Studies In Mathematics, Kim Min Kyeong , Lee Ji Young , Cho Mi Kyung
Published: October 2023

In mathematics education, there has been substantial interest in mathematical problem-solving, which has led to the development of competencies of problem-solving based on the relevance and applicability of mathematical knowledge learned in school to problem-solving in one’s everyday life. This study revisits the development of ill-structured problem-solving and its pedagogical implications with the aim of providing students with a transferable problem-solving experience in which the knowledge they learn in school can be meaningfully employed in a real-world context. To examine the overall trend of research focusing on ill-structured problems or ill-structured problem-solving, this study statistically analyzed the papers published in the field of mathematics education in Korea according to the research period, topic, research method, and mathematics content strands to provide useful insights as descriptive research. More specifically, the ill-structuredness of textbook problems, the process of ill-structured problem-solving and the collaborative problem solving that emerges from ill-structured problem-solving were analyzed more closely. Based on the results, the researchers suggested the directions and implications for mathematical problem-solving in terms of ill-structured problems or problem-solving in mathematics education.
Looking Around Research on Proof in Mathematics Education in Korea
Authors:   The Korea Society Of Educational Studies In Mathematics, Na Gwisoo , Choi Jisun
Published: October 2023

This study aimed to provide an overview of the research on proof in mathematics education that has been conducted in Korea. The 85 studies exploring proof in mathematics education in Korea were selected through three stages, and all the studies were published in peer-reviewed journals. The studies were categorized in terms of research theme and research period. In terms of research theme, the studies were classified into seven categories. The studies on teaching and learning proof in mathematics classrooms have been relatively the most active and numerous. Next, the studies on text related to proof, theoretical and linguistic issues, students’ performance on proof, and gifted students’ learning proof have been carried out. In contrast, the studies on learning proof at the university/tertiary level and mathematics teachers’ concept of proof have been conducted relatively deficiently. Several representative studies for each research theme were introduced briefly. In terms of research period, the 85 studies were classified into three periods: the grounding period of 1990-2000, the growing period of 2001-2013, and the declining period of 2014-2023 (present). Through a review of the studies regarding research period, it was confirmed that the studies on proof in mathematics education in Korea were influenced by the socio-cultural context related to mathematics curriculum which has been developed and implemented at the national level. Finally, it was suggested that advanced technologies including AI and computer-based proof assistants should be considered in future research on proof in mathematics education in Korea.
UPAYA MENINGKATKAN HASIL BELAJAR SISWA KELAS 2A MI MASYHUDIYAH PADA MUATAN MATEMATIKA MELALUI PENERAPAN MODEL PEMBELAJARAN CONTEXTUAL TEACHING AND LEARNING
Authors: Damayanti Alfiani , Agung Setyawan
Published: October 2023

This research aims to find out how the application of the contextual teaching and learning model can improve learning outcomes in mathematics content regarding sides, angles and edges of geometric shapes in class 2A MI Masyhudiyah students. This type of research is classroom action research or PTK. This research design uses the Kemmis and Mc. Taggart model which consists of 4 components, namely planning, implementing actions, observing and reflecting. The research subjects that will be used in this classroom action research are 25 students in class 2A MI Mashhudiyah, consisting of 15 male students and 10 female students. Data collection techniques in this research used interviews, observation and tests. This research data analysis technique uses quantitative descriptive. The criteria for success in this classroom action research are based on increasing student learning outcomes in each cycle. The criteria used to see the success of the action are in the form of increasing student learning outcomes. Students are declared to have improved if a minimum percentage of 70% of all students meet the KKM score of 70. The results of the research show that student learning completeness in the pre-test was 8% with an average score of 43.2%, then in cycle 1 it was 56% with an average score -an average of 68.8 and in the second cycle it was 64% with an average value of 69.2 then in the post test of third cycle it was 80% with an average value of 75. From these data it clearly shows that student learning outcomes have increased and indicators of success have been achieved
Tecnologias do Amanhã
Authors: Silva Carlos Gustavo Lopes da , Santos Jefferson dos , Freitas Junior José Carlos da Silva , Robles José Israel Sanchez , Amorim Filho Mardem Luiz Castro , Dumit Patryck Lino , Martins Vagner Gonçalves , Martins Vinícius Gonçalves , Martins Junior Wanderley , Moraes Wendell Ramada de
Published: October 2023

Há milênios, a humanidade tem buscado maneiras de garantir a sua sobrevivência e melhorar a comunicação. No entanto, ao longo do século XXI, os seres humanos viram as máquinas assumirem um papel crucial, percebendo que elas podem fazer muito mais do que simplesmente realizar tarefas, enfrentando desafios que antes eram invisíveis para a sociedade.

Nas últimas décadas, testemunhamos mudanças profundas que deram origem à Era da Informação e à Era Digital. Avanços tecnológicos significativos têm impactado áreas como economia, finanças, marketing, saúde, indústria e educação. Podemos considerar a Revolução Industrial 4.0 como o início de uma nova era, totalmente imersa em tecnologia, criando um ecossistema que vai além das capacidades humanas tradicionais.

Nesse contexto, esta obra explora o potencial não apenas das tecnologias convencionais, mas também daquelas que são consideradas disruptivas ou emergentes. Para tanto, serão aqui exploradas a Inteligência Artificial (IA), a IA Generativa e Engenharia de Prompts, Metaverso com ESG, Sistemas ERP, Computação Quântica, Computação em Nuvem, Blockchain, Cibersegurança e Resiliência Operacional Cibernética.

Algumas delas vieram para ficar e estão introduzindo uma nova perspectiva e visão para a sociedade em geral.

O que torna este livro uma leitura determinada a todo profissional e gestor do século XXI, para auxiliar na compreensão sobre a importância da evolução das tecnologias em seu cotidiano.
EXAME HISTÓRICO-NORMATIVO DA POLÍTICA NACIONAL DE SAÚDE MENTAL PRÉ NOVA REPÚBLICA (1841 - 1985)
Authors: Guimarães Gustavo Murmel
Published: October 2023

Este trabalho versa diretamente sobre a política de apoio à saúde mental que se desenvolveu no Brasil até meados da deflagração da ordem constitucional conhecida como Nova República. Seu escopo é compreender as bases das primeiras políticas pública de atendimento psicológico a fim de, em estudos futuros, compreender o parâmetros e dogmas que foram reestruturados com a redemocratização do país. Para tanto, realizou-se um apanhado histórico-legislativo da construção do sistema psiquiátrico brasileiro, evidenciando as principais espécies normativas que rudimentar o sistema hospitalar de atendimento a enfermos anímicos. Concluiu-se, por derradeiro, que, embora haja avanços na humanização da psicologia clínica pátria, tais encontram-se sobrepujados pela perspectiva isolacionista e disciplinar das entidades manicomiais, principal instrumento desta fase da política de saúde mental
Impact of Plate Thickness and Joint Geometry on Residual Stresses in 347H Stainless Steel Welds
Authors:   American Welding Society, HONG YU , PICKLE TIMOTHY , YU ZHENZHEN , VIDAL JUDITH , AUGUSTINE CHAD
Published: October 2023

Weldments of 347H stainless steel are potentially susceptible to stress relaxation cracking at elevated service temperatures. Mitigation of stress relaxation cracking susceptibility within a multipass weld requires a good understanding of welding practices and manufacturing techniques to control high tensile residual stresses. In this work, the dependence of residual stress distribution in 347H stainless steel on base plate thickness, joint geometry design, and preheating condition was systematically investigated by using three-dimensional finite element models. The finite element models were validated through good agreement between neutron diffraction measurements and calculated elastic strains. The single-V-groove welds with and without a preheating step all produced similar peak von Mises residual stresses, above 450 MPa, within both the fusion zone and heat-affected zone (HAZ). In plates thicker than 0.5 in. (12.7 mm), high tensile residual stress could be observed in a relatively large area, from the middle of the plate thickness to underneath the top surface. A double-V groove shifted the high tensile stress area to the middle thickness of the weld. A single-J-groove weld was able to confine the residual stress to a very small region near the middle thickness within the fusion zone and suppressed the von Mises residual stress within the HAZ to below 400 MPa.
Determination of total phenolic and total flavonoid contents of Jasminum grandiflorum Lin
Authors: Samiksha ghanshyam khudare  , Subhash R. yende  , Nidhi P. sapkal
Published: October 2023

The current study was focused on the standardization & validation of hydroalcoholic extract of Jasminum grandiflorum (JG). Jasminum grandiflorum Linn. Belonging to family Oleaceae is a well-known medicinal plant. It is an Ayurveda (herbal) medicinal plant. This review is to give comprehensive information on the chemical constituents and medicinal importance of Jasminum grandiflorum. It is commonly known as Chameli in Hindi. The process such as which involved the morphological, microscopical, and physical evaluation. Quantitative determination of phenols and flavonoid in Jasminum grandiflorum hydroalcoholic extract was carried out using chromatographic methods.
The interactive organization of every day “talk” of native Kenyan sign language (KSL) users: The case of cohesion
Authors: Jefwa G Mweri
Published: October 2023

People who are deaf in Kenya operate within a distinct Kenyan deaf culture that uses Kenya Sign Language (KSL) to interact. The focus of this paper is every day “talk” or any signing activities that they engage in during their interaction in everyday contacts. The paper pivots on discourse that is not planned. According to Brazil [1] unplanned discourse is instinctive and happens gradually in time. Therefore, unplanned discourse is spontaneous and impulsive and is heavily reliant on immediate context to make known people’s thoughts and relies less on structure to express meaning, Brazil [2]. An analysis of “Talk” that occurs naturally is conversational analysis. Consistent with Richards et al [3], conversation analysis involves examination of naturally occurring conversations to establish the linguistic attributes of “talk” and how it is used in ordinary life. This is the concern of this paper. It also examines how casual talk achieves cohesion as we investigate the linguistic characteristics of every day “talk” in the context of people who are deaf and users of KSL.
Bacterial contamination of some fruits sold around wastedumps in Owerri metropolis, Nigeria
Authors: AFOR IFEOMA ANNA  , OKEKE PETER N  , EJIOGU CHRIS C
Published: October 2023

Analysis of bacterial contamination of fruits sold near waste dumps in Owerri Metropolis were carried out. The various contamination levels on fruits such as; orange (Citru X sinensis), water melon (Citrullus lanatus), apple (Malus pumila), garden egg (Solanum melongena), groundnut (Arachis hypogeaa), pawpaw (Carica papaya) and carbbage. The fruit samples, each were collected near wastedumps in Owerri metropolis. Fruit samples used as control were collected where there was no wastedump. Each of the samples was packaged into plastic bag and labelled. Sixty fruit samples were collected. (Fifty-four of which were collected near waste dumps while six of the fruit samples were used as the control). Microscopic, physical examination and biochemical test were carried out; five bacterial species were isolated in the fruit samples: Isolate A; Bacillus Subtills, Isolate B; E. coli; Isolate C; Samonella spp, Isolate D; Staphlacocus spp and Isolate E: Klebsiella spp. The results indicate that there were bacterial loads in the fruit samples at each sampling point. The total bacterial loads in the fruits samples ware 1.05x 105 Cfu. This buttress the fact the wastedump maybe contributing to the level of bacterial in the fruit sold around it. The study recommends that Government should stop people from dumping refuse on open market streets rather trucks should be provided to be carrying refuse from various Locations and take them to the approved dumpsites. People selling fruit should be encouraged to display the fruits on a the table and not a the ground where it can be contaminated.
An overview of millets-the nutri-cereals: Its nutritional profile, potential health benefits and sustainable cultivation approach
Authors: Ashwin Porwal  , Gajanan Bhagwat  , Jayesh Sawarkar  , Pravin Kamble  , Mangesh Rode
Published: October 2023

Background: Millets have emerged as a focal point in a search for sustainable and nutritious food sources in recent years, particularly in India. Millets are a group of ancient cereal grains that stand as nutritional powerhouses with diverse health benefits, making them a valuable addition to diets worldwide. These hardy crops grow in a variety of agro-climatic conditions, requiring less water and inputs in comparison to other primary cereal grains. Millet's low glycemic index helps to stabilize blood sugar levels, while its high fiber content benefits heart health by lowering LDL cholesterol levels and increasing good cholesterol. Millets have recently attracted global attention for their potential to alleviate nutrition concerns along with promoting environmental sustainability. The Government of India proposed declaring 2023 the International Year of Millets at the United Nations General Assembly, which was supported by 71 countries. Governments, non-governmental organizations and research institutions are working together to promote awareness, produce improved millet varieties and implement policies that benefit millet farming communities. Aim: To prepare comprehensive data on millet's nutritional profile, potential health benefits, and sustainable cultivation practices. Review Results: In the available literature, it is observed that various types of millets are available and some of them are nutrition-rich while others have different health benefits. Conclusion: By promoting the cultivation of millets, we can diversify our food systems, reduce the pressure on staple crops, enhance agro-biodiversity and contribute to sustainable agricultural practices.
Evaluations of haematological profile in geriatric patients in a tertiary care hospital
Authors: Fathima Yenapoya  , Prajna KM  , Deeksha K
Published: October 2023

Ageing is the process which has an impact on all the cells, tissues, organ systems, and organisms. Alterations or modifications in the bone marrow are observed with ageing. Increased risk of myeloproliferative disorders, anaemia, and a deteriorating adaptive immunity are signs of age-related hematologic alterations, as is a loss in bone marrow cellularity. Evaluations of haematological parameters can be used to track the disease's development. Hence, this retrospective study was designed to evaluate the haematological profile of geriatric patients and to compare the haematological parameters between males and females. The Complete Blood Count reports of 445 patients aged 60 years and above were selected for this retrospective study. The backbone computerized data of these cases were taken from central laboratory of Yenepoya Medical College Hospital. Haematological profile was studied and analyzed from selected cases. The independent sample t test was used to compare the haematological parameters of males and females.P value<0.05 was considered as significant.The results obtained showed that there was a statistical significance in lymphocytes, Eosinophils, MCH, MCHC in Geriatrics patients. There was no statistical significance in haemoglobin, neutrophils, monocytes, platelet count, MCV, PCV, and RBC count .Major abnormalities were found in Haemoglobin and lymphocytes than other haematological parameters. Incidence of anaemia was 77.8% and lymphocytopenia 77.9%.The most frequently observed haematological abnormalities in elderly persons were anaemia and lymphocytopenia. Anaemia was seen to be higher in females than males. Lymphocytopenia was seen to be higher in males than females. Early evaluations of haematological profile will reduce morbidity and mortality among the geriatric patients.
A survey study to evaluate the Greeva Pramana (anthropometric measurement of neck)
Authors: Seetharama Mithanthaya  , Swati Bedehar
Published: October 2023

Pareeksha of Karya Desha i.e., Atura Deha is a prerequisite before performing the Chikitsa. The basic goal behind Pareeksha is an assessment of Bala and Ayu. The “Swa-Angula Pramana” is taken as the unit of measurement of the body parts and structures with respect to length, breadth, height, and circumference. In Ayurvedic literature due importance was given to the measurement of different parts of the body. Greeva is that part of the body that connects the head to the trunk, is one among the Shadanga, and is also known by other names such as Manya, Shirodhi, and Kandhara. The Ayama (length) or Utseda (height) of Greeva is 4 Angula; the Parinaha (circumference) of Greeva is 22 Angula as per Caraka Samhita whereas Sushruta Samhita mentions it as 20 Angula. The present study was to evaluate the measurement of Greeva Pramana among 265 volunteers.