bluuebunny/crossref_metadata_2025 huggingface dataset:
An Exploration of Restructuring the Statistical Estimation Unit in High School
Authors:   The Korea Society Of Educational Studies In Mathematics, Lee Song Hee , Lee Kyeong-Hwa , Kim Ha Lim
Published: October 2023

This study aimed to improve statistical estimation teaching practices in school mathematics, support the development of textbooks according to the 2022 revised mathematics curriculum, and the implementation of the curriculum in the schools. Apropos this, the directions of restructuring the statistical estimation unit were derived by synthesizing the results of previous studies related to statistical estimation. Based on these, specific restructuring suggestions for the statistical estimation unit are proposed as follows. First, in relation to the meaning of the sample and sampling method, it is necessary to focus on the bias in the sampling process to promote conceptual understanding in terms of sample representativeness and to promote the recognition of sampling variability using technologies. Second, in relation to sampling distribution, it is necessary to construct contents that promote conceptual understanding of sampling distribution and the relationship between sample size and sampling variability using simulation. Third, in relation to the confidence interval, it is necessary to construct contents that promote the recognition of the confidence levels as probabilistic confidence and provide interpretation and evaluation opportunities of estimation results using sampling errors. In addition, some examples from foreign mathematics textbooks, that can be referred to when implementing each restructuring suggestion, are explored and presented.
Second Graders’ Understanding of the Equal Sign through Lessons Emphasizing Their Relational Understanding
Authors:   The Korea Society Of Educational Studies In Mathematics, Lee Yujin , Pang JeongSuk
Published: October 2023

This study aimed to analyze how second graders understand the equal sign after learning the unit of addition and subtraction reconstructed to enhance their relational understanding. Apropos this, two classes of students participated in this study, and completed both the pre-and post-test on the understanding of the equal sign. The results of this study showed that the intervention of lessons led to a statistically significant increase in the correct answer rate for almost all items dealing with equal sign definition, equation structure, and equation-solving. Specifically, in the comparison between the pre-and post-test, more students regarded the equal sign as “the same” or “can be exchanged,” whereas fewer students regarded it as an “answer to the problem.” Students could also employ relational strategies more often than operational or computational strategies. This paper concludes with implications on teaching and measuring students’ understanding of the equal sign.
A Review of Statistics Education Reform Efforts in Korea
Authors:   The Korea Society Of Educational Studies In Mathematics, Lee Kyeong-Hwa , Ko Eun-Sung , Tak Byungjoo
Published: October 2023

Statistics education reform in Korea has played a critical role in innovating school mathematics education, as it provides students with skills necessary for a data-driven world. Over the past two decades, numerous researchers, teachers, and governmental support have been devoted to enhancing statistics education. The impact of these reform efforts has led to significant changes in the goals, learning content, structure, instructional methods, and assessment approaches in the national mathematics curriculum, mathematics textbooks, and mathematics classrooms. This article outlines key contributions to improving statistics education since the end of 1990s. It reviews the trend of statistics education research and government initiatives in developing a research-based statistics education system and highlights major changes in the national mathematics curricula and the mathematics textbooks: namely, the enhancement of real-world connection, the integration of statistical problem solving approaches, and the incorporation of technology in statistics education at all school levels. The article also presents prospects and challenges for continuing the reform of statistics education in Korea, based on lessons learned during the review of the reform efforts.
The Trends and Highlights of Mathematics Textbook Research in Korea via Topic Modelling
Authors:   The Korea Society Of Educational Studies In Mathematics, Pang JeongSuk , Hwang JiNam
Published: October 2023

The purpose of this study was to analyze the overall trends of mathematics textbook research in Korea. For this purpose, we collected 455 research articles on mathematics textbooks from all the articles published in seven domestic professional journals of mathematics education. We used topic modelling based on latent Dirichlet allocation algorithms to extract topics that reflected not only overall trends but also the trends by each curriculum revision period, including the top 10 words and three representative papers that best indicated each topic. The most frequent topic that appeared across almost all curriculum periods was concept and term, which focused on specific concepts and their definitions, examples, and representations used in textbooks. Another topic, comparing textbooks, was also popular, recently including more foreign textbooks. Topics such as storytelling and mathematical competency were emergent in a specific curriculum period, indicating the close relationship between textbook research and curriculum revisions. Based on these findings, this paper concludes by sharing several implications for future mathematics textbook research in Korea, discussing which topics continue to be studied and in what directions, as well as which topics need to expanded and why.
A Review of Research Studies on Mathematics Teachers’ Use of Textbooks in Korea
Authors:   The Korea Society Of Educational Studies In Mathematics, Cho Yujin , Chon Hyelim , Song Eunyoung , Kim Gooyeon
Published: October 2023

This study is an integrative review of research trends, data collection methods, operational definitions of key terms, and rationales in Korean research on textbook use by mathematics teachers over the past 13 years. Based on the Temporal phases of curriculum use framework (Stein, Remillard, & Smith, 2007, p. 322), we examined the phases of curriculum use in each study and identified trends in the data collection and analysis methods of each paper. We identified the understanding of the terms teacher’s perception and textbook use in the studies and analyzed how the theoretical framework of each study justified the research questions and methods. The results showed: First, a significant number of studies focused on the transformation stage from written to intended, including teachers’ beliefs, orientations, and knowledge about curriculum use. Second, surveys were the most common method of data collection, followed by interviews, classroom practice/observation and text analysis in similar proportions. Surveys and interviews often did not provide a specific analytical framework for analyzing the results but teaching practice/observation and text analysis were mostly based on previous research and derived results through an analytical framework. Third, to examine teacher’s perceptions, researchers mainly examined the appropriateness/effectiveness of mathematics textbooks or specific content areas. And for textbook use, they examined the teaching methods of mathematics textbooks or specific content areas and cases of task modification. Fourth, few studies fully justified their research questions with a theoretical framework, and only about half of the studies justified their research methods with a theoretical framework. Implications for research and practice are discussed.
A Systematic Review of Literature on Mathematical Problem Posing in Korea
Authors:   The Korea Society Of Educational Studies In Mathematics, Han Jaepil , Yeo Sheunghyun , Kim Eunhyuk , Hwang Stephen , Cai Jinfa
Published: October 2023

In this systematic literature review, we reviewed 48 original empirical papers focusing on Korean students’ and teachers’ mathematical problem-posing (MPP) in classrooms. All the included papers were published in peer-reviewed mathematics education research journals and located through comprehensive database searches and individual journal searches involving Korean students and teachers. We categorized the papers into two main groups based on the type of participants: 34 students’ MPP papers and 14 teachers’ MPP papers. We further categorized the papers based on the characterization of MPP used: MPP as a construct, intervention, or variable. For students’ MPP papers, most were identified as intervention papers that examined the impacts of MPP interventions on students’ cognitive domains (e.g., problem posing, creativity, problem solving) or affective domains (e.g., attitude, interest). For teachers’ MPP papers, more than half of the papers were identified as documenting teachers’ various types of knowledge related to MPP. This systematic literature review will shed light on the research evidence found by these Korean researchers and how their empirical studies were conducted. It will also help disseminate research evidence regarding Korean students’ and teachers’ MPP internationally.
A Critical Exploration of Mathematics Learning Trajectories Research in the Korean Context: A Systematic Literature Review
Authors:   The Korea Society Of Educational Studies In Mathematics, Lee Gima , Kim Hee-jeong , Hwang Jihyun
Published: October 2023

This paper conducts a systematic literature review of research on mathematics learning trajectories within the Korean context and suggests directions for future learning trajectory research. Specifically, the aim of this review is to illuminate the trends of existing and emerging research on learning trajectories in the Korean context, ultimately guiding future research directions in the international research and practice field. This review critically examines 32 articles published in Korea Citation Index journals and reports on national research projects, focusing on the necessities, purposes, and types of research categorized by mathematical content area, as well as the theoretical frameworks used. The results reveal that the types of learning trajectory research conducted in Korea are diverse, encompassing exploration, development, and application of learning trajectories. We suggest that the learning trajectories research warrants further investigation, including discussion on different perspectives in the international contexts. We also posit that these types of research have the potential to create synergy when conducted in a connected series, rather than as disconnected studies.
AI-integrated Mathematics Education: A Review of Literature in the Korean Context
Authors:   The Korea Society Of Educational Studies In Mathematics, Park Mimi , Lim Woong
Published: October 2023

The emergence of AI-integrated mathematics education presents great potential for the field of mathematics education. However, there is limited knowledge about the appropriate use of artificial intelligence, its pedagogical implications, and its impact on the current educational system. This paper conducts a comprehensive review of research papers in the Korean context, with a focus on those published since 2020. The review summarizes research topics and classifies the research by school levels, participants, and research methods related to the studies of AI-integrated mathematics education (AIME) in Korea. Our findings show that many AIME research studies in Korea used qualitative methods. These studies addressed instruction and pedagogical support in AI-integrated learning environments, with several conducted at the elementary and high school levels. However, some did not specify their contexts or participants. Additionally, the research examined the design of mathematical tasks and programs associated with AI-integrated educational technology including various programming languages, physical computing programs, and educational tools to facilitate AI-integrated experiences. Regarding AI-based learning platforms, most research was impact studies. The study also highlights salient curriculum and didactic programs proposed and implemented in the Korean educational community, which can serve as useful models for international communities seeking to implement and advance AI-integrated mathematics education in their respective contexts.
A Case Study on the Learning Possibility of Reversibility through Interaction within the Zone of Potential Construction
Authors:   The Korea Society Of Educational Studies In Mathematics, Park Jeongseon
Published: October 2023

The role of interaction in mathematics education has been steadily studied. However, from the viewpoint of operations and schemes, research analyzing the relationship between interaction and learning or research analyzing the process of learning through interaction was insufficient. This study aimed to analyze the process in which concepts existing in the zone of potential construction becomes the actual level of development from the viewpoint of operations and schemes. To this end, the case of a student who experienced interactive communication related to reversibility was analyzed. The student showed significant mathematical activities through interactions with peer and teacher, but these activities did not lead to actual learning. This paper showed the following conclusions. The process in which concepts existing in the zone of potential construction becomes an actual construction requires interaction and involves changes in various mathematical activities, but learning does not occur only through the accumulation of these interactions or the experience of changing mathematical activities. It requires cognitive construction activities.
DETERMINAN MANAJEMEN LABA PADA PERUSAHAAN PARIWISATA, HOTEL, DAN RESTORAN
Authors: Wahyuni Wahyuni , Yulianto Yocelyn , Maulidianti Ade , Dosinta Nina Febriana , Yunita Khristina
Published: October 2023

Laporan keuangan merupakan bentuk pertanggungjawaban manajemen terhadap pengguna laporan, sehingga sering menjadi target rekayasa pelaporan seperti manajemen laba. Praktik manajemen laba dilakukan oleh manajer untuk menunjukkan laporan keuangan yang menarik bagi pihak eksternal perusahaan. Tata kelola perusahaan yang baik menjadi sebuah sistem yang dapat menekan praktik manajemen laba, diantaranya dewan direksi dan komite audit. Kinerja keuangan diukur menggunakan rasio profitabilitas dan rasio leverage untuk mengukur indikasi terjadinya praktik manajemen laba. Penelitian ini bertujuan untuk menguji peranan ukuran dewan direksi, ukuran komite audit, Return on Equity (ROE) dan Debt to Equity Ratio (DER) terhadap manajemen laba. Penelitian ini menggunakan 17 perusahaan pariwisata, restoran, dan hotel yang terdaftar di Bursa Efek Indonesia (BEI) selama tahun 2017-2021. Hasil penelitian ini menunjukkan bahwa secara parsial, manajemen laba tidak dapat dipengaruhi oleh dewan direksi dan komite audit, sedangkan ROE dan DER memiliki pengaruh negatif terhadap manajemen laba. Kemudian, dewan direksi, komite audit, ROE dan DER secara simultan berpengaruh signifikan pada manajemen laba.
PENGARUH KOMPENSASI, KOMPETENSI, DAN BUDAYA ORGANISASI TERHADAP KINERJA KARYAWAN
Authors: Prahiawan Wawan , Dibyantoro Dibyantoro
Published: October 2023

Employee performance makes a very important contribution to the sustainability of an organization facing increasingly competitive competition. For this reason, efforts are needed to improve employee performance in an organization. Compensation, competence, and organizational culture are some of the factors that were found to affect employee performance. The purpose of this study was to examine the effect of compensation, competence, and organizational culture on employee performance. The research method is quantitative using a questionnaire and the sampling technique is done by simple random sampling. The number of samples used as many as 34 pieces to test the three (3) hypotheses that have been set. Structural Equation Modeling (SEM) was used to test the statistical significance of the path coefficients. The analytical tool used is SmartPLS 3.2.9. The findings of the study explain that compensation has a positive and significant effect on employee performance. Competence has a positive and significant influence on employee performance. Organizational culture has a positive and significant influence on employee performance. The implications of the findings prove that the better the compensation, the higher the competence, and the better the organizational culture can improve employee performance.
PENGARUH VARIASI PRODUK DAN CELEBRITY ENDORSEMENT TERHADAP MINAT BELI MAHASISWA UNIVERSITAS MATARAM PADA PRODUK SCARLETT WHITENING
Authors: Novianingsih Try , Sagir Junaidi , Hilmiati Hilmiati
Published: October 2023

This study aims to examine the effect of product variety and celebrity endorsements on the buying interest of Mataram University students in Scarlett Whitening products. This research is a causal associative research (cause and effect) using primary data, the population used in this study were students from 10 faculties at the University of Mataram. The sampling technique used in this study was a non-probability sampling technique with a purposive sampling technique. With predetermined criteria, a sample of 104 respondents from 10 faculties at the University of Mataram was obtained. The data collection method in this study was an online survey by distributing online questionnaires via links that had been filled in with previous questions. The data analysis procedure uses Multiple Linear Regression Analysis. So the results of this study indicate that the variable Product Variation has a positive and significant effect on the buying interest of Mataram University students on Scarlett Whitening products, and the Celebrity Endorsement variable has a positive and significant effect on the buying interest of Mataram University students on Scarlett Whitening products.
RACISMO ESTRUTURAL E VIOLAÇÃO DOS DIREITOS DAS CRIANÇAS E DOS/AS ADOLESCENTES NO BRASIL
Authors: Nova Adeildo Vila
Published: October 2023

Os direitos fundamentais das crianças e das/osadolescentes instituídos no Estatuto da Criança e do/aAdolescente (ECA) dispõe sobre a proteção integral àcriança e à/ao adolescente (art. 1º). Expressos em lei, umrol de importantes mecanismos de proteção às crianças eàs/aos adolescentes estão propostos, porém considera-seum abissal descompasso entre a lei e a realidadevivenciada cotidianamente pelas crianças e adolescentesno nosso país. Por meio de uma revisão biobibliográfica épossível perceber que os 32 anos de instituição do ECAsão insuficientes para eliminação das violências contracrianças e adolescentes e para a superação dasdesigualdades.
La escuela que transita hacia encuentros de aprendizaje incluyentes
Authors: Robi Santacruz Ingrid Margareth , Ortega Burbano Leidy Raquel , Jiménez Guzmán Claudia Patricia
Published: October 2023

This article presents the conceptions of pedagogical practices, from the framework of the DUA, developed by the teachers of the Simón Bolívar educational institution, in Samaniego (Nariño). It is qualitative research, with a hermeneutic method, which allows to recognize meanings from the interpretation. It was carried out with the participation of 10 teachers from the primary and high school levels, from the IE Simón Bolívar, in Samaniego (Nariño). The information was collected virtually, complying with the biosafety regulations adopted during the confinement associated with Covid-19. The interview, the semi-structured survey, and the review of learning guides (managed in the educational institution from the home school modality) were used. Among the results, it can be highlighted that teachers develop and promote pedagogical practices from the DUA framework. However, these are developed as unarticulated activities, making this an unintended process. Finally, we reflect on the school we want, rethinking, transforming and articulating the teaching-learning process from diversity, towards education for all. One of the conclusions leads to working towards the comprehensive development of students, which requires teachers committed to constant training, which allows them to keep up with the evolution of societies. Moving towards spaces that promote education for all requires intentional, thoughtful and conscious pedagogical practices. Articulating the UDL framework to these practices is a strategy that allows work in the classroom to be enhanced.
Regional Tourism Resilience under Crisis Impacts: The Cases of Yangtze River Delta and Pearl River Delta
Authors: Liu Yi , Chen Liaofan , Han Fangfei , Zhang Tong
Published: October 2023

Since the beginning of the 21st century, various crisis events have occurred frequently, inflicting substantial impacts on the tourism sector, which has garnered considerable scholarly and policy attention. Nevertheless, limited research has systematically explored tourism resilience at the urban scale, and there is a paucity of studies comparing regional differences in tourism resilience under distinct crisis scenarios and their underlying causes. Thus, this study focuses on the Yangtze River Delta and the Pearl River Delta, employing Martin’s regional economic resilience measurement method. It assesses the tourism resilience of the two regions under the impact of the 2008 financial crisis and the COVID-19 pandemic, subsequently visualizing the data results using ArcGIS software. The study also endeavors to unveil potential causes for disparities in urban tourism resilience. The main conclusions are as follows: Firstly, regions with higher economic development exhibit relatively weaker tourism resilience during economic crises, yet demonstrate comparatively stronger resilience during public crises. Secondly, distinct differentiations exist both between and within the Yangtze River Delta and the Pearl River Delta, primarily stemming from variations such as geographical positioning, tourism resource endowments, and industrial and economic structures, both regionally and within individual cities. Thirdly, the determination of regional tourism resilience is intricate and cannot be restricted to a single dimension; multidimensional indicators better encapsulate the essence of regional tourism resilience.
Physio-biochemical responses of registered bread wheat (Triticum aestivum L.) genotypes to drought stress: Variations in antioxidant parameters and photosynthetic pigment amounts
Authors: Koç Canan , Ulusu Funda , Ulusu Yakup
Published: October 2023

In this study, physio-biochemical parameters of 7 registered bread wheat (Triticum aestivum L.) genotypes (Gerek 79, Sultan 95, Haymana 79, Grk/Cty, T98-9, Pastor, PM ME1) were investigated under drought stress conditions. Polyphenol oxidase (PPO), peroxidase (POD), ascorbate peroxidase (APX), catalase (CAT), photosynthetic pigment, total protein, hydrogen peroxide, lipid peroxidation (malonyldialdehyde-MDA) and proline levels were determined in this wheat genotypes exposed to different drought duration (3rd, 6th and 10th day). As a result of this study, among 7 different wheat genotypes, Gerek 79 and Haymana 79 genotypes were the most physiologically sensitive to drought. In comparison, Pastor and Sultan 95 genotypes were the most drought-tolerant varieties. In addition, in parallel with the prolongation of the drought period in wheat varieties in general, it was determined that the content of photosynthetic pigments decreased significantly due to oxidative damage, while proline and MDA content increased
Tenun sebagai Media Terapi dalam Konseling Pastoral bagi Perempuan Korban Kekerasan di Sumba
Authors: Natar Asnath Niwa
Published: October 2023

Abstract. Sumbanese women often experience silencing in their lives so that they are unable to speak out including on the violence they experience. This silencing also occurs in the field of pastoral care, because it has been going on for long, causes women to be unable to speak up and tell their problems, even when given the opportunity to speak once. It is, therefore, necessary to think of creative ways, other than verbal conversation, to encourage women, especially those who have experienced violence, to tell their stories using cultural elements that are around them and that they live with on a daily live, namely woven fabric. Woven fabric is one example of the use of art as a medium in pastoral counseling. For this reason, a description and analysis of art therapy and Sumba woven fabric from a feminist perspective was carried out. The results of the analysis showed that art therapy through Sumbanese woven cloth can encourage the involvement (emancipation) of women victims of violence in efforts to discover and heal themselves.Abstrak. Perempuan Sumba sering mengalami pembungkaman dalam kehidupan mereka sehingga mereka tidak mampu bersuara termasuk atas kekerasan yang mereka alami. Pembungkaman ini juga terjadi dalam bidang pendampingan pastoral, yang karena sudah terlalu lama berlangsung, menyebabkan kaum perempuan tidak mampu untuk berbicara dan menceritakan masalah mereka, bahkan ketika diberi kesempatan bicara sekali pun. Karena itu perlu dipikirkan cara-cara kreatif, selain bentuk percakapan verbal, untuk mendorong kaum perempuan, secara khusus mereka yang mengalami kekerasan untuk bercerita dengan menggunakan unsur budaya yang ada di sekitar mereka dan yang mereka hidupi sehari-hari, yaitu kain tenun. Kain tenun menjadi salah satu contoh penggunaan seni sebagai media dalam konseling pastoral. Untuk itu akan dilakukan deskripsi dan analisis tentang terapi seni dan kain tenun Sumba dari perpektif feminis. Hasil analisis menunjukkan bahwa terapi seni melalui kain tenun Sumba dapat mendorong keterlibatan (emansipasi) perempuan korban kekerasan dalam upaya penemuan dan penyembuhan dirinya.
El valor cultural del patrimonio inmueble en el Perú para la renovación del turismo cultural. El caso del Centro Histórico de Lima
Authors: Lebrún Aspillaga Ana María , Geovannini Acuña Helga
Published: October 2023

El Centro Histórico de Lima cuenta con bienes inmuebles invaluables que a lo largo de los años han sufrido deterioro constante. Con el fin de determinar para la renovación del turismo cultural el valor del patrimonio inmueble, se examinaron, por medio de una investigación mixta que incluyó el análisis documental y una ficha estructurada de registro y encuestas, los valores culturales y el valor universal excepcional (VUE) asociados. Se identificó que el reconocimiento de aquéllos y éste por parte de los actores involucrados constituye un elemento relevante para la renovación turística, permitiendo la puesta en valor y conservación del centro histórico. ____________ The Historic Center of Lima possesses an irreplaceable immovable heritage, which has suffered constant deterioration over the years. To determine its value for the renewal of cultural tourism, the associated cultural values and outstanding universal value (OUV) were examined through a mixed investigation that included documentary analysis, and a structured record and survey file. It was identified that the recognition of the former and the latter by the actors involved constitutes a relevant element for tourism renewal, allowing the enhancement and conservation of the historic center.
Formación en competencias digitales para la conservación a largo plazo de patrimonio documental en México
Authors: Escalante Ilizaliturri Armida Guadalupe , Blanco Rivera Joel Antonio
Published: October 2023

El presente INFORME ACADÉMICO examina la integración de saberes y el desarrollo de competencias sobre preservación digital en programas académicos del ámbito de las ciencias de la información, en el que está inscrita la conservación de acervos documentales. Se explican algunas actividades de la gestión documental en México, con la finalidad de evidenciar las necesidades de incorporar competencias computacionales y de gestión en la práctica y la formación del profesional de los acervos. Asimismo, se argumenta que uno de los componentes principales del desarrollo de esas competencias es el uso de laboratorios de prácticas de preservación digital por los estudiantes, y se describe la vinculación de ésta con la formación en conservación de acervos documentales de la Escuela Nacional de Conservación, Restauración y Museografía (ENCRyM, México). __________ The present ACADEMIC REPORT examines the integration of knowledge and the development of digital preservation competencies within academic programs in information science, including the conservation of documentary heritage. Certain document management activities in Mexico are explained to highlight the need to incorporate the teaching of computing methods and management for archives and information professionals. Furthermore, this report argues that one of the main components in the development of said competencies is the incorporation of a digital preservation laboratory and describes its relationship with education in the conservation of documentary heritage at the Escuela Nacional de Conservación, Restauración y Museografía (ENCRyM, Mexico).
Are Floating River Sediments Decreasing on Bulgarian Territory?
Authors:   Climate, Atmosphere and Water Research Institute at Bulgarian Academy of Sciences, 66 Tsarigradsko Chaussee Blvd, Sofia 1784, Bulgaria, Bournaski Emil , Berman Viacheslav ,   Institute of Hydromechanics, National Academy of Sciences of Ukraine, 8/4 Zhelyabova st., Kyiv - 03680, Ukraine, Ivanov Ivan ,   Climate, Atmosphere and Water Research Institute at Bulgarian Academy of Sciences, 66 Tsarigradsko Chaussee Blvd, Sofia 1784, Bulgaria, Chapanov Yavor ,   Climate, Atmosphere and Water Research Institute at Bulgarian Academy of Sciences, 66 Tsarigradsko Chaussee Blvd, Sofia 1784, Bulgaria, Orehova Tatiana ,   Climate, Atmosphere and Water Research Institute at Bulgarian Academy of Sciences, 66 Tsarigradsko Chaussee Blvd, Sofia 1784, Bulgaria
Published: October 2023

An analysis is made of the formation factors and regime of floating river sediments on the territory of Bulgaria, considering the influence of the relief (land surface), climatic conditions such as rainfall intensity, snowmelt, wind effects, water erosion, afforestation (forest vegetation), the amount of river runoff, and anthropogenic activity. A period of 35 years (1951-1995) is covered, characterized by intensive hydrotechnical construction and industrialization in Bulgaria. The twofold impact on the quantity and quality of suspended sediments from anthropogenic activity has been revealed. It is difficult to find reliable data for an accurate quantitative assessment, but the general conclusion the research conducted is that there has been a noticeable tendency to decrease the amount of suspended sediment in most rivers in the country in recent decades.
Lessons Learned, and Pitfalls to Avoid in Modern Rheometry
Authors:   Delft University of Technology & Deltares, Mekelweg 2, 2628 CD, Delft, The Netherlands, Talmon Arno , Meshkati Ebi ,   Deltares (now with R&D Boskalis, Rosmolenweg 20, 3356 LK, Papendrecht, The Netherlands, van Rees Floris ,   Deltares & Utrecht University, The Netherlands
Published: October 2023

Rheometry is the measurement of rheological properties. Rheometry is essential to understanding and quantifying the flow behaviour of non-Newtonian fluids. Results may differ from one research group to another, or from machine to machine. We will address discrepancies that may arise from the conversion of the machine’s rotational velocity to physical shear rate, ill-defined protocols, the occurrence of wall slip, (bottom) gap size variations, and differences in sample preparation. We confine ourselves to materials consisting of fine colloidal constituents, which form a homogenous carrier fluid with eventual coarse material augmenting the rheology, but are inert by themselves and prone to jamming your rheometer or may settle during the rheometric measurement. Wall slip may occur in rheometry, especially in smooth-walled geometries. Wall slip transpires when the composition of the mixture near the wall differs from that in the interior. A method to identify wall slip in rheometry involves comparing flow curves obtained from various geometrical dimensions, such as pipe/capillary diameter, sheared gap size, or radical testing with vane. Coarse constituents may promote wall slip, but surprisingly, we also encountered it in natural fluid mud without coarse particles. Measurements show that the narrow bottom gap, the mechanical default of the concerned rheometer using vanes, impacts results. The application of dedicated protocols to measure specific properties is another crucial aspect that is emphasized in this paper.
Functional Test for Sewage Pumps
Authors:   University of Rostock, Departmet for Water Engineering, Eckstädt Hartmut , Nitzsche Tim ,   Technical University Berlin, Departmet of Fluid Dynamics, Poehler Michael ,   Technical University Berlin, Departmet of Fluid Dynamics, Thamsen Paul Uwe ,   Technical University Berlin, Departmet of Fluid Dynamics
Published: October 2023

Wet wipes cause many blockages in sewage pumps. The clogging materials of field pumps were analyzed. The clogging effect of comparable wet wipes was determined in laboratory tests to test the suitability of different types of sewage pumps. For this purpose, a conveyor circuit was constructed and fed with different wastewater concentrations (proportion of wet wipes) and conveyor flows. Two new indicators, DF and DLTF, are used to evaluate the results. A reproducible test procedure was tested and proposed.
Houska Based Time-Dependent Rheological Model for Flocculated Tailings
Authors:   Delft University of Technology & Deltares, Mekelweg 2, 2628 CD, Delft, The Netherlands, Talmon Arno , Meshkati Ebi ,   Deltares (now with R&D Boskalis, Rosmolenweg 20, 3356 LK, Papendrecht, The Netherlands
Published: October 2023

The rheology of tailings depends on composition and is shear- and time-dependent. Time-dependency might be at the origin of phenomenona such as channel and pattern formation in tailings beaching. Rheology is governed by colloids that form a structure within the fluid. This paper concerns the fitting of the Houska rheological model to controlled stress rheometry data of polymer treated material. The Houska model describes reversible time-dependency, e.g., thixotropy. A novelty here is that irreversible shear down (rheomalaxis) is added to the thixotropy originally captured by the model. The Houska model has the advantage that its time-dependency can be phasewise implemented and tested in numerical codes. In our study, it is shown how the model can be fitted to published detailed controlled shear stress rheometry on flocculated mature fine tailings and is compared with the fitting by a viscosity bifurcation model, which was originally applied. The fits of the viscosity bifurcation model and the current model are comparable. The influence of rheomalaxis on the formation of a lubricating layer in tailings disposal on a beach is investigated by means of a CFD model: flow depth reduces and irregular flow develops.
Techno-Economic Energy Optimization of the Off-Grid Electrical System with Power to Gas Storage Technology
Authors:   niversidad Nacional Amazónica de Madre de Dios, Huamán-Romaní Yersi-Luis , García-Vilela Lucy Mariella ,   Universidad Nacional de Frontera, Agreda Cerna Henrry Wilfredo ,   Universidad Nacional José María Arguedas, Seminario-Morales María-Verónica ,   Universidad Nacional de Frontera, Sánchez-Prieto María-Gregoria ,   Universidad Nacional de Frontera, Gutiérrez-Gómez Edgar ,   Universidad Nacional Autónoma de Huanta, Silva Giovanna Jackeline Serna ,   Universidad Nacional Intercultural de Quillabamba, Carbajal Nestor Cuba ,   Universidad Norbert Wiener, Bedriñana Marco Antonio Añaños ,   Universidad Nacional Autónoma de Chota, Cordero Carmen-Rosa-Zenozain- ,   Universidad Científica del Sur
Published: October 2023

Renewable energy sources (RESs) have undeniable advantages over the recent years not only to supply electrical demand but also electrical demand. However, maximum use of the RES’s power has always been challenging as high penetration of the RESs as well as their intermittent nature might compromise the distribution networks power flow constraints. This paper proposes optimal energy operation of the off-grid distribution network (DN) with participation of the power-to-gas (PtG) storage system. In this regard, PtG system is considered as an energy supplier in the DN. The natural gas generated by using PtG is applied to backup diesel generators for meeting demand at peak times. The objective functions in the system are modeled based on technical and economic modeling including minimize the operation cost and maximize the system reliability. The optimal energy operation in the two case studies is assumed considering non-participation and participation of the PtG system. To solving of the energy optimization, particle swarm optimization algorithm is proposed. Finally, proposed case studies under numerical simulation are implemented for validation of the participation of the PtG system.
“Levanta a saia, lá vem a maré”
Authors: Gonçalves Dantas Raquel , Da Costa Oliveira Siqueira Denise
Published: October 2023

O objetivo deste artigo é discutir o feminismo angoleiro em um contexto contemporâneo de comunicação de violência e crise. O movimento debate práticas e discursos, gerando formas de conhecimento e epistemologias do corpo. A questão que nos instiga diz respeito a como os feminismos atravessam diferentes territórios. Em termos metodológicos, fazemos um levantamento sobre a noção de ginga, remetendo à líder africana Nzinga e a seu papel na incorporação do conceito no Brasil. Araújo, Barreto, Navarro, Lima, Bracks, Gilroy e Vidor são alguns nomes que ajudam a compor o referencial para discutir a ginga como pensamento e comunicação do corpo capaz de provocar reflexões sobre o papel do feminismo angoleiro.
Pengaruh Efikasi Diri, Ekspektasi Pendapatan, dan Kebutuhan Akan Prestasi Terhadap Minat Berwirausaha Mahasiswa Fakultas Ekonomi Universitas Negeri Padang
Authors: Putra Andika , Oknaryana Oknaryana
Published: October 2023

Penelitian ini bertujuan untuk mengetahui pengaruh efikasi diri, ekspektasi pendapatan dan kebutuhan akan prestasi terhadap minat berwirausaha mahasiswa Fakultas Ekonomi dan Bisnis Universitas Negeri Padang. Metode yang digunakan dalam penelitian ini yaitu metode kuantitatif. Teknik analisis yang digunakan dalam penelitian ini yaitu teknik analisis regresi linear berganda. Populasi dalam penilitian ini adalah mahasiswa Fakultas Ekonomi Universitas Negeri Padang tahun masuk 2019. Adapun teknik pengambilan sampel dalam penelitian ini yaitu dengan menggunakan teknik purpose sampling dengan jumlah responden sebanyak 85 orang. Pengumpulan data dalam penelitian ini menggunakan kuesioner/angket yang disebar dengan menggunakan link google formulir. Hasil penelitian menemukan bahwa (1) Efikasi diri berpengaruh positif dan signifikan terhadap minat berwirausaha mahasiswa Fakultas Ekonomi Universitas Negeri Padang. (2) Ekspektasi pendapatan berpengaruh positif dan signifikan terhadap minat berwirausaha mahasiswa Fakultas Ekonomi dan Bisnis Universitas Negeri Padang. (3) Kebutuhan akan prestasi tidak berpengaruh terhadap minat berwirausaha mahasiswa Fakultas Ekonomi dan Bisnis Universitas Negeri Padang.
Interscholastic Policy Debate Promotes Critical Thinking and College-Going: Evidence From Boston Public Schools
Authors: Schueler Beth E. , Larned Katherine E.
Published: October 2023

Few interventions reduce inequality in reading achievement, let alone higher-order thinking skills, among adolescents. We study policy debate—an extracurricular activity focused on improving middle and high schoolers’ critical thinking, argumentation, and policy analysis skills—in Boston schools serving large concentrations of economically disadvantaged students of color. Student fixed effects estimates show debate had positive impacts on English Language Arts (ELA) test scores of 0.13 SD, equivalent to 68% of a full year of average ninth-grade learning. Gains were concentrated on analytical more than rote subskills. We find no harm to math, attendance, or disciplinary records, and evidence of positive effects on high school graduation and postsecondary enrollment. Impacts were largest among students who were lowest achieving prior to joining debate.
Pendidikan dalam Mencegah Kekerasan Seksual
Authors: Wiyono Patricia Regita
Published: October 2023

Kekerasan seksual yang dialami oleh masyarakat utamanya kaum perempuan di Indonesia masih menunjukan angka yang tinggi. Angka tersebut belum pasti dalam penunjukkan data yang ada di lingkungan tentang kasus kekerasan seksual. Hal ini karena pada kenyataannya masih banyak korban terutama perempuan yang tidak melapor kepada pihak kepolisian atau lembaya layanan seperti Komisi Nasional Anti Kekerasan terhadap Perempuan. Saat ini, segala bentuk kejahatan dapat dialami oleh siapapun dan tidak memandang jenis kelamin, maupun batasan umur. Kasus kekerasan seksual di kalangan remaja semakin meningkat setiap tahunnya. Saat ini remaja seringkali mengalami kekerasan seksual oleh pasangannya saat menjalin kasih atau pacaran. Remaja memiliki rasa keingintahuan yang besar dan cenderung ingin mengeksplorasikan dunia. Namun seringkali hasrat untuk menjelajahi hal ini tidak dibarengi dengan pertimbangan dan pengetahuan yang matang sehingga tindakannya beresiko bagi diri sendiri, orang lain, bahkan lingkungan sekitar. Oleh karena itu, sangat penting untuk remaja mengetahui cara melindungi diri dari kekerasan seksual secara mandiri, yakni dengan adanya edukasi seksual kepada remaja. Ketika remaja Indonesia sudah mulai mengerti bagaimana bentuk kekerasan seksual maka mereka dapat melakukan tindakan proteksi diri.
PLXNB3 is differentially expressed in central nervous system metastasis in human breast cancer.
Authors: Mamoor Shahan
Published: October 2023

Metastasis to the brain occurs in a significant fraction of patients with breast cancer (1-3). We mined published RNA-sequencing and microarray data (4, 5) to compare primary and metastatic tumor transcriptomes for the discovery of genes associated with brain metastasis in humans with metastatic breast cancer. We found that plexin B3, encoded by PLXNB3, was among the genes whose expression was most different in the brain metastases of patients with metastatic breast cancer as compared to primary tumors of the breast. PLXNB3 mRNA was present at increased quantities in brain metastatic tissues as compared to primary tumors of the breast. Expression of PLXNB3 in primary tumors was correlated with patient distant metastasis-free and recurrence-free survival. Modulation of PLXNB3 expression may be relevant to the biology by which tumor cells metastasize from the breast to the brain in humans with metastatic breast cancer.
"Emerging Trends in Nanophotonics and Electromagnetic Metamaterial "
Authors: Theodore Lucas
Published: October 2023

Emerging Trends in Nanophotonics and Electromagnetic Metamaterial
ZMYND19 is differentially expressed in central nervous system metastasis in human breast cancer.
Authors: Mamoor Shahan
Published: October 2023

Metastasis to the brain occurs in a significant fraction of patients with breast cancer (1-3). We mined published RNA-sequencing and microarray data (4, 5) to compare primary and metastatic tumor transcriptomes for the discovery of genes associated with brain metastasis in humans with metastatic breast cancer. We found that zinc finger MYND-type-containing 19, encoded by ZMYND19, was among the genes whose expression was most different in the brain metastases of patients with metastatic breast cancer as compared to primary tumors of the breast. ZMYND19 mRNA was present at increased quantities in brain metastatic tissues as compared to primary tumors of the breast. Expression of ZMYND19 in primary tumors was correlated with patient overall, distant metastasis-free and recurrence-free survival. Modulation of ZMYND19 expression may be relevant to the biology by which tumor cells metastasize from the breast to the brain in humans with metastatic breast cancer.
RHPN1-AS1 is differentially expressed in central nervous system metastasis in human breast cancer.
Authors: Mamoor Shahan
Published: October 2023

Metastasis to the brain occurs in a significant fraction of patients with breast cancer (1-3). We mined published RNA-sequencing and microarray data (4, 5) to compare primary and metastatic tumor transcriptomes for the discovery of genes associated with brain metastasis in humans with metastatic breast cancer. We found that RHPN1 antisense RNA 1 (head to head), encoded by RHPN1-AS1, was among the genes whose expression was most different in the brain metastases of patients with metastatic breast cancer as compared to primary tumors of the breast. RHPN1-AS1 mRNA was present at increased quantities in brain metastatic tissues as compared to primary tumors of the breast. Modulation of RHPN1-AS1 expression may be relevant to the biology by which tumor cells metastasize from the breast to the brain in humans with metastatic breast cancer.
Ismaya
Authors: Ismaya
Published: October 2023

Ismaya Managing change and Inovation
SSU72 is differentially expressed in central nervous system metastasis in human breast cancer.
Authors: Mamoor Shahan
Published: October 2023

Metastasis to the brain occurs in a significant fraction of patients with breast cancer (1-3). We mined published RNA-sequencing and microarray data (4, 5) to compare primary and metastatic tumor transcriptomes for the discovery of genes associated with brain metastasis in humans with metastatic breast cancer. We found that SSU72 homolog, RNA polymerase II CTD phosphatase, encoded by SSU72, was among the genes whose expression was most different in the brain metastases of patients with metastatic breast cancer as compared to primary tumors of the breast. SSU72 mRNA was present at increased quantities in brain metastatic tissues as compared to primary tumors of the breast. Expression of SSU72 in primary tumors was correlated with patient overall, distant metastasis-free and recurrence-free survival. Modulation of SSU72 expression may be relevant to the biology by which tumor cells metastasize from the breast to the brain in humans with metastatic breast cancer.
Materi minggu pertama
Authors: Nabila Salsa
Published: October 2023

Materi minggu pergama
p53-regulated Xist modulation features Mllt1 activation.
Authors: Mamoor Shahan
Published: October 2023

We recently described a sex-specific transcriptional regulation mechanism, found in physiologically relevant settings in breast cancer cells in vitro and in cells of the embryo in mice and humans, wherein mutation or loss of the p53 tumor suppressor results in transcriptional perturbation of the non-coding RNA that functions in X-inactivation, Xist, with this transcriptional change being among the most quantitatively substantial changes transcriptome-wide - naturally, in the presence of p53 mutation, or experimentally following deletion of p53 (1). Here, we studied p53 wild-type and p53 mutant breast cancer cell lines as well as Xist-positive and Xist-negative human embryonic stem cell clones (2, 3) to understand the transcriptional consequences of Xist up-regulation following loss of p53 tumor suppression in development and transformation. We reveal modulation of Mllt1 as a transcriptional feature of Xist induction following impairment (disability) of p53 (4-6).