bluuebunny/crossref_metadata_2025_split huggingface dataset:
EFEITOS DO ROMPIMENTO DA BARRAGEM DA MINA CÓRREGO DO FEIJÃO NA QUALIDADE DAS ÁGUAS SUPERFICIAIS NA BACIA HIDROGRÁFICA DO RIO PARAOPEBA
Authors: BRAIDO Fernanda Loebel , BLASIUS Jandir Pereira , STRADIOTO Marcia Regina , GARCIA Marcelo Loureiro 
Published: July 2024

RESUMO - No dia 25 de janeiro de 2019, a barragem B1 da mina Córrego do Feijão colapsou, formou uma enxurrada com cerca de 12 milhões de metros cúbicos de rejeito, que contaminou o Rio Paraopeba, seus afluentes e causou a morte de 270 pessoas. Neste contexto, o objetivo deste estudo é avaliar os impactos ambientais negativos decorrentes da contaminação do Rio Paraopeba - MG. Foram analisados dados do Instituto Mineiro de Gestão das Águas sobre o monitoramento da qualidade das águas superficiais da Bacia do Rio Paraopeba, a partir de dados de nove estações de monitoramento, entre 2017 e 2022. Os resultados apontaram concentrações de alumínio, arsênio, chumbo, ferro, fósforo, manganês, selênio e zinco acima dos valores de referência estabelecidos pela Resolução CONAMA nº 357/2005 para corpos hídricos de Classe 2, ao longo de toda a Bacia Hidrográfica. A contaminação por arsênio, chumbo e selênio foram originadas pelo desastre de Brumadinho, já os altos teores de alumínio, ferro, fósforo e manganês já eram observados antes de 2019. A partir de 2021 todos os parâmetros apresentaram tendência de queda na região do alto curso da bacia e aumento dos teores no baixo curso, o que sugere a migração destes contaminantes pela bacia.
Palavras-chave: Barragem de rejeitos. Brumadinho. Qualidade das águas. Rio Paraopeba. Monitoramento ambiental.

ABSTRACT - On 25 January 2019, the B1 dam at the Córrego do Feijão mine collapsed, resulting in a torrent of around 12 million cubic metres of tailings, which contaminated the Paraopeba River, and caused the deaths of 270 individuals. This study aims to investigate the impacts of the disaster on the UPGRH SF3 - Paraopeba River Basin and analyse the progression of inorganic element contamination within the Paraopeba River. The data were obtained from the monitoring of surface water quality in the Paraopeba River Basin, developed by the Minas Gerais Institute of Water Management, from nine monitoring stations, on a time interval from 2017 to 2022. The results revealed concentrations of aluminum, arsenic, lead, iron, phosphorus, manganese and selenium, above the reference values set by CONAMA Resolution 357/2005 for water bodies classified as Class 2, across the SF3 basin. Contamination of arsenic, lead and selenium has emerged as a consequence of the Brumadinho disaster, but high levels of aluminum, iron, phosphorus, and manganese had already been detected prior to 2019. From 2021, all the parameters discussed showed a decreasing trend in the upper reaches and an increasing trend in the lower reaches of the basin.
Keywords: Dam wall. Brumadinho. Water quality. Paraopeba River. Environmental monitoring.
Analisis Gaya Belajar Siswa dalam Mengoptimalkan Pemahaman Siswa: Studi Deskriptif di SD Negeri Klender 10
Authors: Anggoro Inggit , Suhendro Petrus Paulus Mbette , Fahrurrozi Fahrurrozi , Hasanah Uswatun 
Published: July 2024

Peran gaya belajar sangatlah krusial bagi siswa guna memahami dan mengolah suatu informasi. Implikasinya terhadap proses pembelajaran ialah untuk mendukung dan mengoptimalkan potensi belajar siswa. Penelitian ini bertujuan untuk mendeskripsikan dan menganalisis gaya belajar siswa di SD Negeri Klender 10. Pendekatan penelitian yang digunakan ialah kuantitatif deskriptif dengan metode survei menggunakan kuesioner. Kuesioner tersebut dibuat berdasarkan teori VARK Neil Flemming. Subjek dalam penelitian, yaitu 30 siswa yang terdiri dari kelas III dan IV menggunakan sampling sensus. Hasil penelitian diperoleh bahwa 30 siswa memiliki gaya belajar yang beragam. Diketahui bahwa perolehan persentase tiap gaya belajar, yaitu gaya belajar visual 20% (6 siswa), gaya belajar auditori 7% (2 siswa), gaya belajar read/write 3% (1 siswa), gaya belajar kinestetik 40% (12 siswa). Diikuti dengan multimodal gaya belajar meliputi visual kinestetik 27% (8 siswa) dan read/write kinestetik 3% (1 siswa). Berdasarkan hasil analisis kategori, maka diketahui kategori tiap gaya belajar tersebut berada pada tingkatan tinggi dan cukup tinggi. Kategori tinggi, yaitu gaya belajar read/write, kinestetik, dan gaya belajar multimodal (visual kinestetik dan read/write kinestetik) berada pada rentang nilai ≥ 68,0. Kategori cukup tinggi untuk gaya belajar auditori dengan nilai 55,70 < x ≤ 68,0. Dengan begitu, penting bagi guru untuk memahami karakteristik siswa sesuai dengan gaya belajar mereka dan orang tua dapat memberikan dukungan dengan menemani dan mengembangkan potensi anak melalui gaya belajarnya.
Pengembangan Media Pembelajaran Virtual Reality Berbasis Android pada Pembelajaran Matematika SMP
Authors: Fernanda Anggia , Retta Allen Marga , Isroqmi Asnurul 
Published: July 2024

Penelitian pengembangan ini bertujuan untuk menghasilkan media pembelajaran Virtual Reality berbasis android pada pembelajaran matematika yang valid, praktis dan efektif. Prosedur pengembanngan menggunakan model pengembangan ADDIE (Analysis, Design, Development, Implementation, and Evaluation). Peserta didik SMP Negeri 4 Tempilang Kelas VII 1 adalah sebagai subjek penelitian. Teknik pengumpulan data yang digunakan adalah wawancara tidak terstruktur, angket, dan hasil belajar peserta didik. Penelitian ini menggunakan analisis data deskriptif pada satu variabel yaitu kualitas media pembelajaran Virtual Reality berbasis android. Hasil penelitian dan analisis data memperoleh penilaian angket dari ketiga validator sebesar 91,8% yang termasuk kriteria sangat valid, rata-rata kepraktisan dengan persentase sebesar 90,7% yang termasuk kriteria sangat praktis, dan keefektifan diperoleh sebesar 82,6% yang termasuk kriteria sangat efektif dengan 19 peserta didik yang tuntas serta 4 peserta didik yang tidak tuntas. Oleh karena itu, peneliti menyimpulkan bahwa media pembelajaran Virtual Reality berbasis android pada pembelajaran matematika SMP terbukti valid, praktis dan efektif.
Efektivitas Penggunaan Model Pembelajaran Discovery Learning terhadap Kemampuan Berpikir Kritis Siswi Kelas X MAS Darul Ulum Alwaliyyah
Authors: Husnidar Husnidar , Khaulah Siti , Rahma Rahma , Safarati Nanda 
Published: July 2024

This research aims to determine the extent to which the mathematical critical thinking skills of class X MAS Darul Ulum Alwaliyyah female students have improved on quadratic function material using the Discovery Learning learning model. The subjects taken in this research were 16 class X female students for the 2023/2024 academic year. This research approach is qualitative with the type of classroom action research. Data analysis techniques carried out in this action research include tests, interviews, and observations of teacher activities and student activities by 2 observers. According to the results of data analysis, it was found that the learning outcomes of female students in cycle I were 75%, and then there was an increase in cycle II, namely 88%. Meanwhile, the level of student activity in cycle I was 84.65% and there was an increase in cycle II to 88.16%. Teacher activity in cycle I was 83.33%, and teacher activity in cycle II increased to 85.33%. Based on this, it can be concluded that the mathematical critical thinking skills of class.
Penelitian ini bertujuan untuk mengetahui sejauh mana peningkatan kemampuan berpikir kritis matematis siswi kelas X MAS Darul Ulum Alwaliyyah pada materi fungsi kuadrat menggunakan model pembelajaran Discovery Learning. Subjek yang diambil pada penelitian ini adalah siswi kelas X tahun Pelajaran 2023/2024 yang berjumlah 16 orang. Pendekatan penelitian ini adalah kualitatif dengan jenis penelitian tindakan kelas. Teknik analisis data yang dilakukan pada penelitian tindakan ini diantaranya tes, wawancara, serta pengamatan terhadap aktivitas guru dan aktivitas siswa oleh 2 orang observer. Menurut hasil analisis data diperoleh bahwa hasil belajar siswi pada siklus I sebesar 75%, dan kemudian terjadi peningkatan pada siklus II yaitu sebanyak 88%. Sedangkan tingkat aktivitas siswa pada siklus I sebanyak 84,65% dan terjadi peningkatan pada siklus II menjadi 88,16%. Aktivitas guru pada siklus I sebanyak 83,33%, dan aktivitas guru pada siklus II meningkat menjadi 85,33%. Berdasarkan hal tersebut dapat disimpulkan bahwa kemampuan berpikir kritis matematis siswi kelas X MAS Darul Ulum Alwaliyyah pada materi fungsi kuadrat dapat lebih meningkat setelah diajarkan menggunakan model pembelajaran Discovery Learning.
On the Exponential Diophantine Equation 2^x-99^y=z^2
Authors: Wariam Chuayjan  , Theeradach Kaewong  , Sutthiwat Thongnak  
Published: July 2024

Abstract: In this work, we determine all non-negative integers solution to the exponential Diophantine equation . The mathematical process bases on several theorems in Number theory, including the modular arithmetic, Divisibility and the Division Algorithm. The solution set to the equation is .
Enhancement of the market attractiveness and success of startups on the circular economy and sustainability principles
Authors: Kofanov Oleksii , Kofanova Olena , Tkachuk Kostiantyn , Tverda Oksana , Shostak Inna 
Published: July 2024

Purpose. The purpose of this study is to develop the methodology and the framework for assessing the level of environmental friendliness of startups in the agricultural sector and their compliance with the circular economy and sustainable development principles using T. L. Saaty’s analytic hierarchy process (AHP) to enhance their market attractiveness and success.
Methodology / approach. The author’s methodology was created based on the AHP approach which is a comprehensive decision-making framework used to divide complex problems into a clear hierarchical structure. This approach enables the evaluation and comparison of multiple criteria facilitating informed decision-making. Calculations have been made in the RStudio.
Results. The authors’ methodology and the framework for assessing the startups’ environmental friendliness and compliance with the circular economy and sustainability principles were created. The unique program was developed and executed in the RStudio using R programming language. The created methodology is based on the hierarchical criteria system consisting of three main criteria – “Compliance with the EU environmental standards and sustainability principles promotion”, “Compliance of the startups’ business model to the circular economy and sustainability principles”, and “Resource usage rationality” with the corresponding sub-criteria. It was determined that the first criterion has the highest impact on the startup eco-friendliness with a weight of 49.2 %, the second one has a weight of 28.7 %, and the third one – 22.1 %. The system of requirements for the AHP experts was also developed.
Originality / scientific novelty. It was substantiated that the application of the original authors’ methodology and program enhance the startups’ market attractiveness and success by strengthening their brand image. The proposed solution facilitates the implementation of the circular economy and sustainability principles for innovative businesses, leading to improvements in environmental protection and waste management.
Practical value / implications. The methodology has been tested on the example of the authors’ bioenergy startup for producing eco-friendly biofuels using agricultural and food industry wastes and minimising the usage of toxic substances. Based on the experts’ opinion and using the authors’ unique program it was calculated that the startup complies with the circular economy and sustainability principles and has an eco-friendly brand image with a 78.6 % probability.
Antecedents of organic prosumption behaviour: examining the moderating effect of ease of organic prosumption practice
Authors: Mathew Rintle , Tholath Deepa Ittimani 
Published: July 2024

Purpose. The purpose of the paper is to examine the moderating effect of ease of organic prosumption practice on the causal relationships between the antecedents of organic prosumption intention and organic prosumption behaviour of organic prosumers in India.
Methodology / approach. The Theory of planned behaviour (TPB) is used to examine the intention and behaviour of engaging in organic prosumption. An empirical investigation was conducted among 128 organic prosumers in Kerala State in India. Data were collected using a survey instrument. Hypotheses were tested using PLS-based structural equation modeling using Smart-PLS software.
Results. The relevance of the TPB model is confirmed with modifications in the present study in Indian context. Attitude towards organic prosumption, and perceived behaviour control together accounted for 35.7 % of variation in the organic prosumption intention, and subjective norms had no effect on intention of organic prosumers. Organic prosumption intention explained 48.1 % variation in organic prosumption behaviour. Ease of practicing organic prosumption significantly moderated all cause effect relations predicting intention and behaviour. In the context of increasing awareness on the benefits of organic farming and prosumption behaviour, the study provides a theoretical explanation for explaining why people engage in organic prosumption behaviour.
Originality / scientific novelty. This paper examines the Theory of planned behaviour in the context of organic prosumption behaviour in agriculture. No literature exists in Indian context to explain such behaviour. Moreover, the perception of these farmers on the ease of practising organic prosumption is also examined as a moderator. Development of a theoretical model to explain organic prosumption behaviour in an Indian context is the novelty of the present study.
Practical value / implications. Organic farming and prosumption has gradually gain wide acceptance as a sustainable way of life. The United Nations have also highlighted the need for sustainable practices in production and consumption. Thus, in the immediate future, governments across the globe will have to look into policy formulations in organic farming and prosumption practices. This paper can contribute towards such efforts by throwing light into how prosumption behaviour is formed, and what are the factors that contribute to and moderate such behaviour.
Printemps qui commence ? De l’écopoétique à l’université
Authors: Cavallin Jean-Christophe 
Published: July 2024

This text offers a collective reflection and feedback on five years of teaching in the Master écopoétique et création program at Aix-Marseille University. The duel of two highly whimsical pseudo-concepts – « Durassic Park » and « Descolatour Regime in literature » – serves to illustrate the double bind of a teaching and literary criticism inevitably torn between disciplinary solipsism and contextual urgency.
Gender segregation in the labor market in Kazakhstan
Authors: Mekebayeva M. , Boltayeva S. 
Published: July 2024

The purpose of the research is to conduct a literary review of studies related to the gender division in the economy and occupational segregation in labor relations, to identify the determinants of the gender gap in the labor market and to assess the level of discrimination against women in Kazakhstan. The article reflects the main problems of the formation and development of the gender economy, including the methodology of gender segregation in the labor market. The main theoretical concepts of gender economics used in the research of foreign and modern Kazakh economists are identifi ed. Methodology – methods of historical analysis, factological (statistical) analysis and forecasting. Originality / value of the research is to identify the problems of modern gender segregation in the labor market of Kazakhstan through a review of research related to gender inequality in the labor market. Findings – a review of the literature showed that there are diff erent concepts of gender segregation in the labor market. Most of the research is aimed at solving applied problems of the gender economy of Kazakhstan, in addition, methodological tools developed by foreign economists are not adapted to the study of Kazakh reality. Most of the studies on gender discrimination in the labor market, especially in Kazakhstan, are of a practical nature. In addition, the interest of many authors in this problem manifests itself sporadically, that is, they do not present the results of systematic research.
Capital structure, profitability and risk: a study of small companies in the industrial sector of the Republic of Kazakhstan
Authors: Kokeyeva S. E. , Adambekova A. A. 
Published: July 2024

The purpose of the study: Determining the impact of the capital structure on small companies’ performance operating in the field of industry in Kazakhstan. The problem statement. The question to be analyzed in this study is: does the capital structure aff ect the performance of small Kazakhstani companies operating in the industrial sector? Methodology: In this study, we use data from 30 small industry companies in Kazakhstan based on annual reports for 2012-2022. The total debt ratio is the dependent variable used in this study. Profi tability, business risk, tax efficiency and age of the company were taken as independent variables. Statistics, correlation and multivariate regression were used to analyze the data. Originality/value of the study: The results showed that borrowed capital is subject to factors of profi tability, tax burden, and business risk. There was no signifi cant impact of the age of the company on the borrowed capital. Relevance: This study complements the literature on capital structure factors in developing countries and the financial condition of small industrial enterprises. This research will be aimed at exploring the potential use of borrowed capital to increase the profi tability of the company to reduce business risks.
Trade and economic cooperation between Kazakhstan and Russia: modern state and prospects
Authors: Baktiarova A. Zh. , Yelshibayev R. K. , Zhangalieva R. U. 
Published: July 2024

Purpose – determination of the signifi cance, assessment of the current state and prospects for the development of trade and economic relations between the states of Kazakhstan and Russia. Methodology – the theoretical and methodological basis of the study are system assessments, general scientific methods of analysis and synthesis, economic-statistical and comparative analysis, as well as SWOT analysis methods that determine the strategic importance of trade and economic cooperation between the two countries. Originality / value – research has been conducted on the signifi cance, current state and prospects of trade and economic relations between Kazakhstan and Russia in the context of geopolitical and integration processes. The strengths and weaknesses, opportunities and threats of cooperation between the two countries are analyzed, and the strategic direction of development is determined. Reserves and directions for increasing the efficiency of development of trade and economic cooperation were also presented. Findings – as a result of a comprehensive analysis of trade and economic relations between the Republic of Kazakhstan and the Russian Federation, an objective assessment of the current situation was given and development prospects were determined. Directions for the development of cooperation between the two countries in the areas of technology improvement have been identified. The issues of expanding trade relations within the Eurasian Economic Union, rational use of the potential of the import and export market were specified.
The impact of China’s direct investment on energy industry development in Kazakhstan
Authors: Tumatay G. , Gu J. , Zhantore U. 
Published: July 2024

The purpose of the research is to study the impact of China’s direct investment on Kazakhstan's Energy industry, it enables them to fi gure out what type of Energy sources need more investment, and the demand level on the Energy services, which require for investigating the feasibility behind investing in Energy industry in Kazakhstan. Research methodology - a regression model of the impact of China’s direct investment on Kazakhstan's Energy industry is established to study the impact of Chinese direct investment on Kazakhstan's Energy industry from four variables: net foreign direct investment in Kazakhstan, Kazakhstan's GDP, China's direct investment in Kazakhstan, and China's direct investment in Kazakhstan's Energy industry. Original / value of the research – China's direct investment in Kazakhstan's Energy industry, compared with other factors, can have a more important impact on Kazakhstan's Energy industry, so Kazakhstan can through cooperation with foreign capital, especially China’s capital, the establishment of joint ventures, to improve the current situation in Kazakhstan's Energy industry bad development. Findings. The results show that the impact of net FDI in Kazakhstan, Kazakhstan's GDP, China's direct investment in Kazakhstan, and China's direct investment in Kazakhstan's Energy industry on Kazakhstan's Energy development is signifi cant and positively related.
«Digital nomads» in the modern labor market
Authors: Rakhmetulina Zh. B. , Suleimenova A. O. , Abylaikhanova T. A. 
Published: July 2024

The purpose of the research: Analyze the economic situation of digital nomads, their infl uence on the labor market, taking into account that they differ in dynamism of geographic mobility. To study the problems of non-traditional employment in the context of digitalization of the economy. Methodology: The paper uses a comparative analysis between digital nomads, freelancers and self-employed citizens, which showed that they form overlapping sets with such common feature as remote non-standard employment. Study of digital nomads involves the use of a non-ethnographic approach, including methods such as online immersive interaction, content analysis of websites, forums, blogs, etc. Originality/value of the research: Despite many publications, there are still a number of diffi culties in studying the phenomenon of digital nomads. The article discusses defi nition of digital nomads, their essential characteristics, differences from self-employed citizens and freelancers. The article proves an important role of digital nomads in the modern labor market, who provide information, technological, managerial support, and various types of services. Findings: Increase in level of the population mobility stimulated emergence of a new form of employment on the labor market. Digital nomads are distinguished by a high level of education and professional training; considerable freedom in choosing the production sphere and provision of services in the fi eld of intangible production. In post-covid conditions, digital nomads can contribute to replacement of lost workers.