bluuebunny/crossref_metadata_2025_split huggingface dataset:
Avances más recientes sobre la aplicación de la altimetría radar por satélite en hidrología. Caso de la cuenca amazónica
Authors: León Hernández Juan Gabriel , Domínguez Calle Efraín Antonio , Duque Nivia Guillermo 
Published: August 2022

El presente artículo sintetiza los principios de la altimetría radar por satélite y presenta las aplicaciones más relevantes que dicha tecnología ha aportado al estudio de aguas superficiales continentales bajo un dominio que se comienza a conocer como hidrología espacial. Dentro de estos, uno de los más importantes tiene que ver con la generación de estaciones virtuales (intersección entre el barrido del satélite y un cuerpo de agua: río, lago, mar interior). Dichas estaciones están siendo actualmente utilizadas como mecanismo de apoyo para el monitoreo hidrológico, especialmente, en lo referente a la densificación de las redes hidrométricas instaladas in situ. Adicionalmente, estas pueden ser caracterizadas con datos provenientes del espacio de la misma manera en que son caracterizadas las estaciones in situ procurando información de carácter hidráulico (pendiente del fondo del cauce, profundidad del flujo cero, coeficiente de Manning, entre otros) que hasta el momento sólo podía ser deducida a partir de mediciones directas en campo.
A novel hybrid PWM algorithm having superior harmonic performance
Authors: López Mesa Diana Jimena , Camacho Muñoz Guillermo Alberto , Díaz Chávez Jaime Oscar , Gaviria López Carlos Alberto , Bolaños Pantoja Gilberto 
Published: August 2022

This paper presents a novel hybrid modulation algorithm which improves the harmonic performance of eight of the most common pulse width modulation (PWM) algorithms for voltage source inverters (VSI) in the electric drive field. From harmonic analysis of these eight algorithms, a methodology was established for designing a hybrid modulation scheme offering superior harmonic performance. The algorithm so designed was validated theoretically by calculating the total harmonic distortion factor FDIST and experimentally by measuring the weighted total harmonic distortion factor VWTHD.
Flotation kinetic constants of two Colombian coals' vitrinite maceral
Authors: Piñeres Mendoza Jorge Luís , Barraza Burgos Juan Manuel , Blandón Montes Astrid del  Socorro 
Published: August 2022

Vitrinite maceral flotation kinetic constants are important in designing flotation columns to be used in separating this maceral group. This work shows the effect of pH, air speed and froth concentration on vitrinite maceral flotation kinetic constants by using two Colombian bituminous coals: El Cerrejón (Guajira) and La Jagua (Cesar). A 5 m high pilotscale flotation column was used in all runs. The samples were processed using 4-10 pH, 0.7-2.1 cm/s air speed and 2-6 ml/kg of coal froth concentration ranges. Both La Jagua and El Cerrejón coals showed high kinetic constants figures in acid conditions (0.692 min-1 at pH 4 and 0.559 min-1 at pH 5, respectively). The results showed that, generally, the best operating conditions for obtaining high vitrinite maceral kinetic constant values were having an acid medium and low air flow and froth concentration.
Morphometric characterisation and classification of the Bobo river watershed in the Nariño department, Colombia
Authors: Benavides Mora Victoria , Tarlé Pissarra Teresa Cristina , Galbiatti João Antonio 
Published: August 2022

The object of this work was to make a morphometric characterization of the Bobo river watershed in the Nariño department in Colombia. A map was created from topographical maps (1:25.000 scale) using the drainage network and the limit of each 2nd order microbasin as database. Dimensional, drainage network and relief morphometric parameters were evaluated for a later hydrological study. The drainage area was 224.97 km2, having a 71.31 km perimeter. The Bobo river watershed is considered to be 6th order and has 176 2nd order drainage channels, 34 3rd order drainage channels, 9 4th order drainage channels and 3 5th order drainage channels. Average drainage density is 3.71km/km², reflecting its high density, having strong, dissected geological formation. The area has a typical Andean land-use pattern, having native wooded vegetation, traditional transitory potato and vegetable growing predominating.
A response surface model allowing nitrogen concentration to affect organic waste-derived compost
Authors: Carolla Carmen , Sánchez Rebeca , Montiel Edie 
Published: August 2022

Differing human activities which have lead to different nations' economic development (excellent scientific, technological consequences and innovation) and caused changes which have not seemed to be the most suited for preserving the resources necessary for sustaining the lives of human beings living in the present or for those of future generations. The wasteful use of different power resources is leading to their exhaustion and substances and waste are being generated leading to environmental contamination. On the other hand, inadequate sanitary conditions are also being produced which can cause difficulties in the field of public health. The Central University of Venezuela has thus proposed dealing with and satisfactorily resolving solid-waste management by exploiting the organic fraction of the waste produced by the university's dining room for making compost. This requires implementing the composting and ensuring that the quality of the materials produced is reproducible. A useful tool for achieving the latter lies in producing a statistical design for composting, leading to a mathematical equation determining factors (independent variables) influence on response (dependent variable) (i.e. the likely power which initially mixed waste may have on nitrogen quality). This methodology leads to obtaining an equation allowing a response surface to be generated. This information would make it possible to control the quality of the product obtained (compost) according to the conditions laid down. This study was aimed at applying the Box-Behnken experimental design in drawing up a response surface model allowing conditions in producing compost to be considered where nitrogen contribution is reproducible. This statistical tool uses four factors or independent variables at three levels; they were: added waste portions (D), amount of sawdust (C) and added humidity (A), as well as aeration period (B). Response measured as nutrient input indicator was nitrogen (N). This design was based on 29 different trials combining the factors being considered. The surface model led to obtaining a quadratic function, as shown in the following equation:
https://i.postimg.cc/NM8hrpSB/eq1.gif
where Y corresponded to analysed response, X1, X2….X4 corresponded to the four selected factors and ε was random error. The following equation was thus obtained: ln(N-ammoniac) = lny2 = - 2,17 - 0.069 A – 0.24 B – 0.48 C + 0.15 D. The maximum point for the amount of nitrogen on the response surface was located by using the estimated equation. The model so obtained was verified by making more compost according to the maximum conditions indicated by the response surface model, finding that the quantity of nitrogen was that expected according to the model. This led to setting the optimum conditions for preparing compost from university dining room waste; its nitrogen contribution was reproducible.
Analysing variance for determining humidity content and measuring directional effect on ultrasound speed in pinus radiata D. Don wood samples
Authors: Ortíz Mansilla Rodrigo , Baradit A. Erik , Navarrete A. José 
Published: August 2022

This study was carried out in order to analyse the ultrasound technique as an alternative form of assessing the structural state of different wooden buildings. This work studies the effect and relative importance of measurement direction and moisture content on ultrasound speed in wood. Radiata pine wood samples were subjected to 1 MHz longitudinal ultrasound pulses. A 22 factorial design was run in a completely random experiment. Measurement direction was the significant factor, as shown by the analysis of variance, explaining 95% of total ultrasound velocity variability. Average tangential and radial propagation speeds were between 0% and 15% moisture content, 1644 m/s and 2130 m/s, respectively. The results of this study showed that wave propagation direction is the most important factor during wood structure ultrasound evaluation. Future studies with combined planes are underway.
Investigation of communication skills perceived by students from instructors
Authors: Hacıcaferoğlu Serkan 
Published: August 2022

Background and Study Aim. The aim of this research is to examine the communication skills of the students studying at the faculties of sports sciences, as perceived by the instructors.
Material and Methods. The study was conducted using general survey model. The sample group of the study is consisted of a total of 714 randomly selected voluntary students, including 423 males and 291 females, who study at Faculty of Sports Sciences. The Communication Skills Evaluation Scale, was used as the data collection tool in the study. In the analysis of the data, t-test and one-way variance analysis and Tukey test analysis were used.
Results. According to the variables of the high school they graduated from, the department they studied and the grade level, it was determined that the communication skills they perceived from the instructors were at a moderate level. In addition, it was determined that the perceived communication level of male students studying in the coaching department was higher than that of male students studying in the teaching department.
Conclusions. Male and female students of sports sciences in the learning process should have effective communication skills in order to be prepared for their sociality and professional life. The acquisition of this skill largely depends on the efforts of the instructors in their courses and extracurricular activities during the undergraduate period. In this context, the instructors who attend the courses should be competent in their own branches, as well as being able to communicate positively and effectively with male and female students.
The effects of small-sided games versus traditional training on physical fitness and skills among Under-12 hockey players
Authors: Tajudin Faizal Izwan M. , Malek Nor Fazila A. , Azmi Abdul Muiz N. , Tan Kevin , Vasanthi Rajkumar K. , Abadi Fariba H. , Nadzalan Ali Md 
Published: August 2022

Background and Study Aim. Despite many evidences showed the effectiveness of small sided games (SSG) to be included in sport training programs, majority of the study was done in soccer, while is very limited in hockey. The purpose of this study was to determine and compare the effects of small sided games and traditional training on physical fitness components (cardiovascular endurance, power, speed) and skills (dribbling, hitting, passing) among Under-12 hockey players.
Material and Methods. A total of 36 primary schools’ male students aged below 12 that represent their district were randomly divided into three groups; i) 3x3, ii) 4x4 and iii) traditional training (TT). The yo-yo test (cardiovascular endurance), standing long jump test (power) and 30m sprint test (speed) were conducted to measure level of physical fitness performance while the skills of the players was tested based on the skills of dribbling, hitting and passing. Pre- and post-tests were conducted on all fitness and skill level before and after 8 week intervention period. Mixed between within analysis of variances (ANOVA) was used to analyze the differences in physical fitness and skills performance between and within the three groups.
Results. The results of this study showed all groups managed to improve their physical fitness and skills in the post test. However, the 3x3 and 4x4 SSG have better improvement compared to TT in physical fitness while no significant differences were found in skills tests.
Conclusions. In conclusion, SSG interventions were found to be more effective in improving physical fitness but not in terms of skills. Coaches are encouraging to implement SSG in their training program in order to improve both physical and skills among hockey players.
Toward damage-tolerant bulk metallic glasses: Fracture behavior and brittle–ductile transition
Authors: Ryu Wook Ha , Kim Ji Young , Park Eun Soo 
Published: August 2022

AbstractIn order to replace the conventional alloys with bulk metallic glasses (BMGs), studies have been actively conducted to investigate the mechanical characteristics of BMGs in various aspects. One of the major ongoing issues is process-related variations in key properties such as fracture toughness. Although there is still a lack of knowledge on how to prevent catastrophic failure in most BMGs, Griffith’s theory, modified by Irwin and Orowan, allows us to understand that the dissipation of plastic energy by atomic rearrangement within the shear band is a key factor in designing damage-tolerant BMGs by preventing crack opening. In this article, we discuss the fracture behavior of BMGs in relation to Griffith’s theory and review studies that examined how intrinsic and extrinsic factors, such as alloy composition, temperature, sample size, and strain rate affect the brittle–ductile transitions in BMGs. As several BMGs recently reported excellent fracture toughness similar to that of ductile alloys such as conventional low-carbon steels, damage-tolerant BMGs will be a new class of high-performance structural engineering materials with significant technological strengths.
Graphical abstract
Analysis of Violations of Corporate Governance Principles in Smuggling Cases of Garuda Indonesia
Authors: Shawaaba Afiatika Ayyi , Maulani Dikrilla Sarla , Nirmala Dita Ayu , Subekti Muhammad Fauzan Abimanyu 
Published: August 2022

This study aims to analyze the violation of corporate governance principles in the smuggling case of a Harley Davidson motorcycle and two Brompton bicycles on the new Airbus A330-900 by the President Director of PT Garuda Indonesia and four other boards of directors involved in supporting it. The type of research used is qualitative research with a descriptive research design. This study focuses on analyzing an object by studying it as a case intensively. This research uses the data analysis method content analysis approach with the study documentation collection method. Research data sources were obtained from secondary data, namely by searching for previous research, the internet, financial reports from PT Garuda Indonesia, and several other reliable sources. It can be seen from this study that the smuggling act by the former president director of PT Garuda Indonesia violated the five principles of good corporate governance.” The five principles are transparency, accountability, responsibility, independence, and fairness. These five principles must be used as guidelines for companies in carrying out their performance so that companies can operate efficiently and effectively and compete well in the market.
RELAÇÕES ÉTNICO-RACIAIS NA EDUCAÇÃO PROFISSIONAL E TECNOLÓGICA: UMA REVISÃO INTEGRATIVA
Authors: Santos Iraneide Nascimento dos , Silva Neta Maria de Lourdes da , Santos Carolina da Franca Bandeira Ferreira 
Published: August 2022

Este estudo tem como objetivo analisar as evidências científicas sobre educação das relações étnico-raciais no âmbito da educação profissional e tecnológica. Trata-se de pesquisa exploratória e qualitativa, cuja técnica de revisão integrativa da literatura permitiu a seleção sistemática dos relatos em seis etapas. Inicialmente, a busca dos artigos através do SciELO, Periódico CAPES e Google acadêmico a partir dos termos raça, etnia, relações étnico-raciais e educação profissional, juntamente com operadores booleanos, resultou em 11.336 títulos, e após a triagem, 11 artigos foram incluídos. Para discussão, foram utilizadas as categorias: institucionalização da Lei nº 10.639/2003 e currículo; racismo estrutural; lei das cotas; núcleo de estudos, pesquisas e extensão afro-brasileiros e indígenas; experiências pedagógicas acerca da diversidade étnico-raciais; percepções dos alunos e professores acerca da diversidade étnico-racial no currículo; e a atuação dos professores para educação profissionalizante de mulheres negras. Constatou-se que há um longo percurso a se percorrer para institucionalização das Leis 10.639/03 e 11.645/08 nos currículos e nas práticas de ensino-aprendizagem da formação profissionalizante, reforçado pelas percepções negativas dos alunos e professores sobre diversidade étnico-racial nos currículos das instituições educação profissional e tecnológica, principalmente quando se trata dos cursos integrados. No entanto, as leis de cotas, a implantação do NEABI e as diversas experiências de ensino destacaram-se como ações afirmativas promotoras da igualdade racial.
Riesgo suicida y estrategias de afrontamiento al estrés en población campesina colombiana
Authors: Bahamon Marly Johana , Quiceno Japcy Margarita , Gómez Alejandra , Herrera Silvia Franchesca , Vélez Ana María , Vinaccia Stefano 
Published: August 2022

Introducción: El comportamiento suicida hace referencia a las diversas conductas para dejar de vivir es un fenómeno multifactorial ampliamente estudiado en población urbana, sin embargo, la población campesina, especialmente agricultores y trabajadores agrícolas están entre los grupos de alto riesgo.
Objetivo: Evaluar las relaciones entre el riesgo suicida y las estrategias de afrontamiento al estrés en una muestra de 76 campesinos entre los 18 y 79 años del municipio de El Santuario, Colombia, durante la emergencia sanitaria por Covid-19.
Método: Para este estudio se utilizó un diseño descriptivo correlacional de corte transversal y se emplearon como instrumentos la Escala de Evaluación de Riesgo Suicida –ERS– y la Escala de Estilos y Estrategias de Afrontamiento (EEEAE).
Resultados: Los resultados encontrados en la Escala ERS no indicaron niveles clínicos de riesgo suicida. Y respecto a la EEEAE casi siempre los participantes usaban las estrategias de Reevaluación positiva, Apoyo social, Desconexión cognitiva y Resolver el problema. Hubo correlaciones negativas entre todas las dimensiones de la escala ERS con EEEAE, menos entre las dimensiones Depresión/Desesperanza y Aislamiento/Soporte social (ERS) con la Desconexión cognitiva (EEEAE) y especialmente la estrategia de Reevaluación Positiva tuvo un peso significativo sobre riesgo suicida.
Conclusiones: La Reevaluación Positiva es una estrategia de afrontamiento que puede proteger la salud mental ante situaciones de estrés asociados con el riesgo suicida de la población campesina, los agricultores y trabajadores agrícolas.
PROJECT-BASED 21S- CENTURY THEMATIC LEARNING MEDIA DEVELOPMENT USING SAC FOR ELEMENTARY SCHOOL STUDENTS
Authors: Husna Eva Aina 
Published: August 2022

This study aims to develop project-based thematic learning media using SAC to improve 21st-century skills for fifth-grade elementary school students and test the learning media's feasibility, practicality, and attractiveness. The research method used is development research or called RD. The research model used is the Borg and Gall development model. The implementation of the development steps does adjust to the needs of the researcher. Given the limited time and funds owned by the researchers, simplified these steps into four steps: data collection, planning, product development, validation, and trials. The questionnaire consisted of media experts, material experts, learning experts, practitioners (teachers), and student responses. The research used quantitative and qualitative descriptive techniques. The results from the media expert validation got a score of 68.89 or categorized as "Eligible." The material expert's assessment results got a score of 93.84 with the "Very Eligible" category. The score of the learning expert assessment is 83.63 categorized as "Very Eligible." obtained the feasibility of the media from the teacher's evaluation with a score of 82.85 categorized as "Very Eligible." The student questionnaire assessment got a score of 83.92 or "Very Eligible." All expert validations, teacher assessments, and student responses obtained an average score of 82.96 which means the project-based thematic learning media of SAC is "Very Eligible." So it can conclude that this learning media is appropriate for improving elementary school students' skills in the 21st century.
historia social hoy en Colombia
Authors: Archila Neira Mauricio 
Published: August 2022

Hace unos años escribí un texto sobre la historia social (HS de ahora en adelante) vista desde América Latina, en el que proponía una acepción acotada de ella centrada en los actores y movimientos sociales, lo que comúnmente se llama historia desde abajo. Así la diferenciaba de la versión estrictamente económica o de la relacionada con la vida cotidiana —las otras dos acepciones convencionales sobre HS— así como del gran programa que encerraba la propuesta de Eric Hobsbawm de apostarle a una historia de la sociedad. La mía es una definición acotada de HS, pero abierta a la totalidad; al fin y al cabo, la historia desde abajo siempre mira hacia arriba —como se dice en inglés: from the bottom up.
Alkil keten dimer / borik asit kombinasyonları ile emprenye edilen sarıçam (Pinus sylvestris L.) örneklerinin boyutsal kararlılığı ve mekanik özellikleri
Authors: KÖSE DEMİREL Gaye , TEMİZ Ali 
Published: August 2022

Alkil Keten Dimer (AKD); ıslak mukavemet ve kâğıdın basılabilirlik özelliklerini değiştirdiği için çoğunlukla kağıt endüstrisinde kullanılır. AKD, odunun hidroksil gruplarıyla reaksiyona girer ve hidrokarbon zincirlerinin etkili bir şekilde esterleşmesine katkıda bulunur. Oduna AKD ilavesi ile boyutsal kararlılığın arttırılması hedeflenmiştir. Ayrıca çevre dostu olan bor bileşikleri ahşabın biyolojik zararlılara karşı korunmasında oldukça etkilidir. Ancak bor bileşikleri odundan kolayca yıkanabilmektedir. AKD/BA sinerjik etkisi ile birlikte bu olumsuz özelik giderilmeye çalışılıp odunun boyutsal kararlılığı arttırılmaya çalışılmıştır.
Bu çalışmada AKD (%5, %10, %18) ve borik asit (%3 BA) kombinasyonları ile emprenye edilmiş sarıçam (Pinus sylvestris L.) odun örnekleri kullanılmıştır. Örneklerin su alma ve boyutsal kararlılıkları ile mekanik özellikleri belirlenmiştir. Su alma ve boyutsal kararlılık testi için AWPA E4, liflere paralel basınç direnci için TS 2471 standartları kullanılmıştır. Elde edilen sonuçlara göre AKD/BA kombinasyonunun daha düşük su alma oranına sahip olduğu görülmüştür. Mekanik testte AKD ve BA sinerjik etkisi ile birlikte örneklerin mekanik özellikleri bir miktar iyileşmiştir.