bluuebunny/crossref_metadata_2025 huggingface dataset:
Ownership Structure and Corporate Risk Disclosure in Emerging Countries
Authors: Adamu Musa Uba
Published: July 2024

The study examines the impact of ownership structure on corporate risk disclosure in African emerging countries. The sample includes 42 firms that are listed on the Johannesburg Stock Exchange and the Nigerian Stock Exchange. The data for the independent variables were taken from the Bloomberg data stream, whereas the data for the dependent variable were taken from annual reports retrieved from the website of the sample companies. The study’s time period runs from 2014 to 2018. Regression and content analysis were employed as the analytical tools. We perform text analysis on company annual reports to ascertain the risks that companies disclose, and regression analysis was used to establish the extent to which ownership structure influenced corporate risk disclosure. The result shows that strategic and environmental risk disclosures are dominated by operational risk disclosure. It has become a convention for the firms to divulge considerable positive, past, non-monetary information rather than negative, future and monetary risk information. Moreover, it is discovered that the decision to improve risk disclosure is largely influenced by company size and profitability. In contrast, firms are reluctant to unveil risk information provided the shares of the company are not concentrated in the hands of few individuals. Nonetheless, company risk disclosure practice is unaffected by institutional investors, government, foreigners, insider ownership and leverage. It can be concluded that the enterprises operating in emerging African markets have made improvements totheir risk disclosure practices. However, there is still room for further improvement. Monetary, future, and negative risk information are the most important risk disclosures that various stakeholder groups, such as investors, demand to see. Hence, there is a need for regulation that can compel corporations to publish the most pertinent risk information. Even though risk disclosure is voluntary in these two African emerging countries, ownership structure is one of significant predictors of corporate risk disclosure.
Rhetorical moves and genre development analysis of hard science field abstracts
Authors: Ramadhini Tasya Maharani , Gunawan Wawan , Muniroh Dian Dia-an
Published: July 2024

Non-native English scholars are expected to publish international journals with abstracts written in English. There are a lot of factors that caused the rejection of journal article publication; one of them is disorganized writing styles. Compared to the native English speakers, the issues regarding disorganized writing styles appeared more in the non-native English speakers’ research article since they have different writing styles, cultures, and mother tongues. Abstract Coaching Clinic Workshop was held for Indonesian University of Education (UPI) scholars so that it is hoped that there would be an increase in the quality of composing research article abstracts and an increase in the number of international publications from scholars. The purpose of this research is to uncover rhetorical moves and genre of the abstracts, its genre development, as well as the linguistics features used in the abstracts. Thirty abstracts made by fifteen UPI scholars who were also the participants of the Abstract Coaching Clinic Workshop were collected as the data for the analysis. Hyland’s (2000) theory was used to analyze each move and step of the abstracts. The results show the occurrence frequency of each move and step, along with the linguistic features used by the academicians; and the development of their abstract writing from before and after the coaching clinic session. The findings serve as a potential reference for those researchers that are concerned in discourse analysis, cross-cultural abstracts, and research publication needs.
Eksplorasi teks sastra frankofon dalam pengajaran bahasa Prancis sebagai bahasa asing di Indonesia
Authors: Intan Tania , Mulyadi Yadi
Published: July 2024

The term francophone refers to the French-speaking community around the world, whereas francophone literature is all French-language texts produced by authors originating from francophone countries. This study discusses the exploration of the literary text of the francophones in teaching French as a foreign language in Indonesian context. The method used is the descriptive qualitative literature review approach. Data in the form of words, phrases, and sentences in French were collected from data sources, which consisted of French language teaching manuals and francophones novels. Data translated directly by researchers and validated by native French speakers. The data are then classified, interpreted, and reviewed according to the context. The results of this study indicate that: through reflection in a pedagogical framework, it can be agreed that the literary text of the francophones, like other literary texts from around the world, is fertile ground for building learners' intercultural competence. From the discussion, it is also known that the text of the francophones has been used in FLE learning in Indonesia although it is not yet optimal, because it is limited by the linguistic competence of the learner and has only been given to classes from middle to the upper level (between levels B1-B2). This study also proves that the literary text of the francophones can be attributed as a potential learning medium to be explored in the language class, but it requires certain competencies from the teacher, adequate preparation, and thorough execution.
EFL Students' Experience in Speaking Practice on Discord Application
Authors: Sartika Dewi , Sudana Dadang , Gustine Gin Gin
Published: July 2024

Being fluent in a foreign language requires many practices. However, Indonesian EFL learners might find it challenging to find a speaking partner to practice with as English is not widely used in the society. Moreover, the outbreak of Covid-19 has restricted people to communicate face to face, thus they seek for alternative modes of communication utilizing technology. This study was conducted in order to provide a detailed account and explanation of how learning English informally through a social media called Discord could be a better alternative to practice speaking English. The study involved two EFL students with different background based on their reason of joining the application. Narrative inquiry was used as the method of the study with data collected from interviews and observations to gather the stories on how they practiced their English in the application. The stories were then retold in a narrative account which then validated by the participants. The result includes a detailed account of the experience of practicing English in informal settings with an explanation of how these experiences reflected on the factors affecting speaking skill and ways to develop the three main aspects of speaking. With the results, Discord application shows the possibility to be an alternative for EFL students in finding a place and partners to practice their speaking.
Sastra Sunda dalam Kurun Waktu Tiga Dasawarsa Terakhir
Authors: Hendrayana Dian
Published: July 2024

Sundanese literature is still being written and read today. Its existence is still supported by discussions and studies, festivals, and performances. In its development, Sundanese literature shows its characteristics periodically through writing techniques, style of expression, and the themes it raises. The purpose of writing this article is to describe the existence of Sundanese literature in the last three decades. The method used is phenomenology and narrative research from Creswell by analyzing events and activities related to Sundanese literary life in the last three decades, as well as observations on Sundanese literary life based on literary works written in Sundanese magazines and Sundanese newspapers, in the 1990s until now. The study of drama literature is carried out on performances that are usually performed by Sundanese theater communities. The data obtained shows that the life of Sundanese literature, namely poetry, prose, and drama is still developing when compared to other regional literature in Indonesia. This can be seen from literary activities, literary performances, and literary prizes.
Stylistics Literature in Qashidah Burdah by Imam Abu Abdillah bin Sa’id Al-Bushiry
Authors: Sopian Asep , Ali Mad , Latifah Nur
Published: July 2024

Qashidah burdah is rich in linguistic style and content, however it is regrettable that many readers simply read without experiencing the beauty of language and the depth of meaning. Stylistic analysis may be used to examine the usage of linguistic style in literature and its consequences for meaning. The goal of this research is to define the components that influence the stylistics and linguistic style of qashidah burdah. To accomplish this purpose, a form of qualitative study using a content analysis technique was applied. According to the findings of the phonological analysis of qashidah burdah chapters 9 and 10, sawamit (consonant), sawait (vowel), and qafiyah (verse) were evaluated from a phonological aspect; As for the lexical aspect, there are 7 pairs of words at-Taraduf (synonyms) and a pair of adh-Dhiddhu (antonyms); From the grammatical aspect there is taqdim ta'khir and from the morphological aspect there is Ikhtiyar al-Sighah, al-'Uduul bi al-Sighah 'an al-Asl al-Siyaqi, Al-idmar fi maudi', and al-Izdiwaajiyah; from the aspect of language style there are assonance, alliteration, anastrophe, apostrophe, polysyndeton, ellipsis, and euphemism; and aspect of rhetoric there is simile, metaphor, epithet, synecdoche, irony, and personification..
Implikatur Tuturan Guru dalam Pembelajaran di Sekolah Menengah Atas: Suatu Kajian Pragmatik
Authors: Prasetiyo Anggik Budi , Sukarno Sukarno , Wibisono Bambang
Published: July 2024

Learning is a process of delivering knowledge to students. Teachers as learning facilitators can use utterances that contain implicatures in them. The purpose of this study was to find and describe the form, function, and benefits of using implicatures in the teacher's utterances during the learning process. In addition, this study intends to interpret the responses of students to the teachers’ utterances that contain implicatures in it. The research data is in the form of words in the teacher's speech which are indicated to contain implicatures. The data was obtained from the transcription of recorded speeches by the teacher of Indonesian History and Indonesian Language class XII majoring in Science and Social Sciences at SMA Negeri Arjasa, Jember. The data that has been collected was analyzed using a pragmatic approach that empowers the theory of speech mode, the communicative function of speech acts, and the benefits of implicatures. The results of this study indicate that 1) there are three forms of implicature found, namely imperative, interrogative, and declarative forms, 2) several functions of implicature were found, namely the function of asking or ordering, threatening, advising, insinuating, and reprimanding), 3) there are four benefits of using implicatures, namely smoothing speech, training sensitivity, creating the impression of humor, and motivating students, 4) In addition, it can be said that students understand the teacher's speech that contains implicatures.
Pengembangan Buku Pengayaan Cerita Rakyat Jepara Bermuatan Nilai Humanis bagi Peserta Didik SMP
Authors: Melani Melly Vila , Qomariyah U’um
Published: July 2024

This study aims to produce an enrichment book of Jepara folklore containing humanist values for junior high school students. This study uses the Research and Development (RnD) research method which is then adapted to the needs of the researcher. The researcher's needs include five stages, namely: (1) potential and problem collection, (2) data collection, (3) product design, (4) design validation, and (5) design revision. Collecting data using literature study techniques, interviews, needs questionnaires for students and educators, as well as prototype validation questionnaires. Data analysis used descriptive qualitative, namely data exposure and data conclusions. The Jepara folklore enrichment book containing humanist values got the average score from the validator, namely: (1) The content/material aspect got an average score of 83.33% with a very decent category, (2) the presentation aspect got an average score of 79 .16% so that it falls into the very feasible category, (3) the language and readability aspects get an average score of 82.25% with a decent category, and (4) the graphic aspect gets a perfect average score of 100% so that it is included in the very category. feasible. The prototype of the enrichment book was developed into three main parts, namely the introduction, the content, and the closing section. Based on the assessments carried out by two expert validators in the field of literature and the field of book writing, the Jepara folklore enrichment book containing humanist values for junior high school students is very appropriate and attracts students' interest in exploring folklore material.
Variasi Tuturan Basa Walikan dalam Sosial Media: Studi Kasus Komunitas Pemuda-Pemudi di Kota Malang
Authors: Rizqy Muhammad Hifni Sahila , Suryadi Muhammad
Published: July 2024

The use of the walikan language as an expression of pride in identity in the Malang youth community has different variations depending on the speakers. The unique variations of the walikan bases can arise due to regional and gender differences between men and women. This study aims to examine how the unique variations of basa walikan can occur based on differences in social strata and gender using a socio-dialectological approach. Through a socio-dialectological approach, it can be known about the variations in the language used by the Malang youth community in using digital tools. This research uses a descriptive-qualitative approach. The data collection technique uses the listening and taking notes technique which in this case is represented through listening activities and being directly involved in communication using the Walikan language through social media applications, namely Instagram. Another technique used to further deepen the analysis is the interview technique. In addition, the equating comparison technique and the differential comparison technique were also used to analyze the data that had been collected. The results of this study indicate that there is a unique variation of the walikan base used by Malang youth, namely, the walikan base variation in the lexicon order, speech acts, and semantics.
Pengembangan Materi Donner des Informations Personnelles Melalui Media Pembelajaran Berbasis Virtual Reality pada Keterampilan Menyimak Bahasa Prancis
Authors: Andika Yunilis , Ekowati Sri Harini , Ismail Subur
Published: July 2024

Efforts to attract students' interest in the learning process need to be carried out by the teacher. In the 21st century, the use of technology is the main key to applying interesting and fun learning media, especially in French listening skills. The difficulty of students in listening to foreign language speech is often encountered because they have insufficient background knowledge to support their hearing. For this reason, the application of technology-based learning media, especially virtual reality in French, can be done. This research is included in the development research design. The development steps according to the Lee and Owens (2004) development model include (1) analysis, (2) design, (3) development, (4) implementation, and (5) evaluation (evaluation). The data collection technique used was in the form of a document study to determine the material to be developed based on the Alter Ego 1+ textbook. The material is analyzed first, then applied to virtual reality-based learning media. The use of this media can be a good strategy to motivate students in listening skills.
Analisis Video Pembelajaran Materi Teks Berita pada Kanal Youtube untuk Pembelajaran Bahasa Indonesia
Authors: Andini Salsabilla , Setyonegoro Agus , Priyanto Priyanto
Published: July 2024

This study aims to find out what are the learning videos of news text material that are already on YouTube based on the characteristics, specifications, and the advantages and disadvantages of the videos. This study uses a type of qualitative descriptive research. The data analysis technique uses the data analysis technique Miles and Huberman. This research gets results with videos that are generally 5-10 minutes long, in general the videos are in accordance with KD, indicators and learning objectives of news texts. Apart from that, video specifications are obtained with an aspect ratio of 16:9, resolution of 720 (HD), and a frame rate of 30fps. There are 40 learning videos on YouTube analyzed based on Miles and Huberman according to research criteria and a review of learning videos, 22 learning videos for news texts are found to be appropriate. Video material regarding identification of news elements and identification of news elements and concluding news content.
Parenting Styles in the Film 20th Century Women (2016): An Issue of Generation Gap
Authors: Cahyati Virgi Widya , Gandana Isti Siti Saleha , Dallyono Ruswan
Published: July 2024

Parenting styles can be influenced by a number of sociocultural factors, one of which is generation gap. This study analyses the kinds of parenting styles evident in the film 20th Century Women (2016). The study specifically focuses on the main character Dorothea’s ways of raising her son Jamie, who is forty years apart in age. The analysis points to three different parenting styles adopted by Dorothea: (1) authoritative, (2) authoritarian, and (3) permissive. The study confirms that generation gap has influenced the kinds of parenting styles adopted by the character. This study has thus shed light on an important sociocultural as well as contextual factor influencing parenting style.
An Analysis of the Motivation in Learning English as a Foreign Language of Senior High School Students
Authors: Garini Selza Azzahra , Pratolo Bambang Widi
Published: July 2024

Motivation is an element that affects a student's ability to learn. There are two different kinds of motivation: integrative and instrumental. Instrumental motivation moves learners to learn a language because of positive attitudes toward the target language, culture, community, way of life, literature, etc. Integrative motivation drives individuals to learn a language for practical reasons. This study aimed to determine the motivation for learning English as a foreign language among 12th-grade senior high school students and the factors that influence the students' motivation to learn English. The type of research used was a mixed method sequential explanatory model by conducting quantitative research first, followed by qualitative data collection. To collect the quantitative data, the researcher used questionnaires. Meanwhile, to manage the qualitative data, the researcher conducts semi-structured interviews. The result of the study shows that it was found that 12th-grade high school students have both integrative and instrumental motivation. Then, four factors influence the student's motivation, namely: the teacher, the method of teaching, which refers to the way that students are taught, the Atmosphere in class, and success in learning.
The Role of Learning Motivation on The Influence of School Culture in Improving Students’ Literacy
Authors: Edwar Rizka Cintya , Amin Muhammad , Khairunnisa Ayang , Mufti Digor , Samsinar Samsinar
Published: July 2024

This study aims to analyze the role of learning motivation on the influence of school culture in improving literacy of class XII SMKN 1 Sorong City. This research uses quantitative methods. The population in this study were all students of class XII Accounting and Banking of SMKN 1 Sorong City which amounted to 123 students. The sample size was calculated using the Slovin formula with an error tolerance of 5℅, so a sample size of 95 students was obtained.  Data collection was carried out using a questionnaire, then the data was processed using the SEM PLS program. The results showed that (1) school culture has a positive and significant effect on the literacy of class XII SMKN 1 Sorong City (2) school culture has a positive and significant effect on the learning motivation of class XII SMKN 1 Sorong City, (3) learning motivation has a positive and significant effect on the literacy of class XII SMKN 1 Sorong City (4) class motivation influences positively and significantly on the influence of school culture, on the learning literacy of class XII SMKN 1 Sorong City.
The Powers of Self-Reflection in English Language Learning Using Video Project Based-Learning
Authors: Sulistyo Teguh , Lutviana Rizky
Published: July 2024

Project based-learning (PjBL), focusing on students’ creativities in producing a particular task, has been variously integrated into English as a Foreign Language (EFL) instruction to promote students’ skills. To support PjBL, teachers have integrated the use of technologies in the classroom since technologies enable teachers to modify teaching-learning activities. One of the modes of technology commonly applied is video project-based learning (VPBL) due to its benefits for both teachers and students. Research reveals the benefits of integrating PjBL and VPBL by focusing on the learning outcomes. In addition, self-reflection, as the ability of students to assess themselves regarding how and what they have learned and done in the tasks, might empower students to be better. This study highlights the benefits of self-reflection in English language learning through VPBL. VPBL empowers learners to create videos on topics of interest, using English as the communication medium. This study is a kind of literature research summarizing the findings of the previous studies on the utilization of self-reflection on students’ speaking projects. The study found that VPBL fosters self-reflection among learners, as they must plan, produce, and evaluate their work. Self-reflection is a crucial skill for language learning, as it helps learners to identify their strengths and weaknesses, set goals, and monitor their progress. The powers of self-reflection in English language learning using VPBL indicate that teachers must employ such cases in the classrooms.
Estudio comparado de los métodos de iniciación a la flauta en Galicia
Authors: Escorihuela Carbonell Guillem , Lariño Rodal Iago
Published: July 2024

The initiation to the study of the transverse flute involves the acquisition of a basic technique which is learned through different methods of initiation, but: do they adjust to the technical variables of the legislative framework? What are the most significant technical parameters for the teachers of the Xunta de Galicia? The main objective of this research is to know which methodological proposal works the contents established in the regulatory framework more effectively. To do this, a methodology consisting of an analysis of the methods and the design and validation of a questionnaire for the teachers in Galician conservatories has been used. The conclusions are revealing in the sense that the teaching of flute in this Autonomous Community is carried out through three methods, and none of them fully satisfy neither the concerns of teachers nor the demands of Galician legislation.
Cuentos de animales en las fábulas españolas de finales del siglo XVIII-XIX. Primera aproximación a un catálogo comentado
Authors: Rodríguez García Miguel
Published: July 2024

In this work a thorough search for folkloric animal tales is conducted in Spanish fable collections from the late 18th and 19th centuries. For their identification, we rely on the indexes of Uther, Camarena, Chevalier, and Rodríguez Adrados. In total, around two hundred versions are cataloged, many of which are not compiled in the inventories of Camarena and Chevalier (1997) or Amores (1997), featuring several narratives with primarily oral dissemination that lack equivalents in Aesopian or medieval fables. The tales are not only classified but also comparatively discussed in terms of narrative, structural, ideological, ethical, and political aspects. However, the author's analysis focuses particularly on the literary and historical meanings of fauna and its relationship with humans, applying the theoretical and methodological framework of Animal Studies. Additionally, other references to animal folklore in the examined fable books are noted, demonstrating the benefits of studying the fable genre in this time period.
Güneş enerji santrallerinde PV*SOL yazılımının güvenilirliğinin değerlendirilmesi
Authors: Balkan Abdussamed , Görel Göksu
Published: July 2024

Fosil yakıtların çevreye verdiği zarar ve tükenebilir bir kaynak olmasından ötürü yenilenebilir enerji dalında artan talep sonucunda yüksek verim ihtiyacı ortaya çıkmıştır. Santrallerin kurulumundan önce verimlilik düzeyinin saptanması için kullanılan bazı performans analizlerine olan ihtiyaç da aynı doğrultuda artmıştır. Bu doğrultuda geliştirilen yazılımlar aracılığıyla santralin kurulumuna başlanılmadan önce santrale ait tahmini üretim değerleri, amortisman süresi gibi verilere önceden ulaşılabilmektedir. Yatırımcılar bu yazılımlar ile en yüksek verime sahip alanları saptayarak santral kurulumuna başlamaktadırlar. Bu çalışmada elektrik enerjisi üreten 1.166 kWp/1000kWe kapasiteye sahip Afyonkarahisar ili Dinar ilçesi Gençali köyü mevkiine kurulmuş olan bir fotovoltaik sistemin Lüytob üretim verileri ile PV*SOL programına ait üretim değerleri karşılaştırılmıştır. Bu çalışmada PV*SOL programı ile gerçek üretim sonuçlarını karşılaştırılmıştır ve PV*SOL programının sonuçlarının güvenilirliği değerlendirilmiştir.
The Phenomenon of Neologization in the Poetry and Prose of Ukrainian Futurists: Creation of a Corpus of Texts and Automation of Lexical Novelty Mining
Authors: NAKHLIK Olesia ,   Lviv Polytechnic National University, Lviv, Ukraine, KOLESNYK Yehor ,   Lviv Polytechnic National University, Lviv, Ukraine
Published: July 2024

This article is dedicated to the analysis of the activity of neologization processes in the works of Ukrainian futurists. The movement’s ideological underpinnings, which served as a catalyst for linguistic experimentation within the movement, are briefly discussed. Additionally, the article provides a concise historical overview of Ukrainian futurism and its broader historical context. A critical concern addressed in this study is the need to augment the corpus of Ukrainian futurist texts to facilitate further research in this area. The research offers a comprehensive spectrum of neologisms that have been formed through various methods and have been employed across diverse literary genres within the context of Ukrainian futurism. Specifically, it formulates criteria based on the absence of identified terms in prominent linguistic references, such as the “Large Electronic Dictionary of Ukrainian” and the “Dictionary of the Ukrainian language” in 11 volumes, and the “Dictionary of the Ukrainian language” published in 1909. Moreover, the inclusion criteria involve the limited occurrence of neologisms in the “General Regionally Annotated Corpus of Ukrainian,” with a focus on distinguishing futurist works from those of non-futurist authors, exemplified by the comparative analysis of futurist writers and Mike Johansen. Furthermore, the study delves into the methods employed to automate the extraction of these neologisms, showcasing both their advantages and disadvantages in the realm of linguistic research. A crucial aspect of the study involves a quantitative analysis of the frequency of neologisms in the works of futurist writers and Mike Johansen. This comparative analysis aims to unveil characteristic features of word formation within futurist literature. Through practical demonstrations, the study enhances our understanding not only of the linguistic nuances within Ukrainian futurism but also of the broader implications of utilizing automated approaches in the study of linguistic evolution and innovation.
Análisis de las propiedades físicas y mecánicas del adobe con asfalto reciclado
Authors: Ospina García Miguel Ángel , Chaves Pabon Saieth Baudilio , Moreno Anselmí Luis Ángel , Patarroyo Arias Lisseth , Pérez Castro Margarita Rosa
Published: July 2024

Introducción— En este trabajo se ha realizado un análisis físico y mecánico del mejoramiento del material de ladrillo de barro (en Colombia se conoce como "Adobe") con asfalto reciclado.
Objetivo— Evaluar en el laboratorio, el comportamiento del material de adobe con la adición de asfalto reciclado.
Metodología— Para cumplir con el objetivo, se realizó una investigación cuantitativa para caracterizar las pruebas físicas mediante el análisis de la granulometría y la densidad. Las mismas pruebas caracterizan la resistencia mecánica en bloques de ladrillo de barro, construidos con dosis de cero, dos, cuatro y ocho por ciento de asfalto reciclado. Se basa en pruebas de laboratorio.
Resultados— De acuerdo con los resultados obtenidos en los ensayos, las propiedades mecánicas, como la resistencia a la compresión y a la flexión fueron mejoradas, añadiendo asfalto reciclado a los ladrillos de barro y en comparación con las muestras sin contenido de asfalto.
Conclusiones— Los ladrillos de barro estabilizados con dos por ciento de asfalto reciclado tienen el mejor comportamiento en resistencia a la compresión y a la flexión según los ensayos de laboratorio.
Metodología para el monitoreo y análisis del sistema de transmisión de camiones mineros como una herramienta decisoria para su mantenimiento
Authors: Pedraza Cristian Antonio , González Coneo Jorge Enrique , Martínez Sánchez Jorge Luis , Higuera Cobos Oscar Fabián , Hernández Vásquez José Daniel
Published: July 2024

Introducción: El sistema de transmisión de los vehículos mineros constituye uno de sus componentes más importantes. Este sistema esta sometidos a diversas condiciones de operación (por ejemplo: sobrecalentamiento, fatiga, fractura y desgaste, etc.) que pueden generar la falla de transmisión produciendo pérdida de disponibilidad. Debido a esto, es de vital importancia establecer las condiciones operacionales del equipo, a partir de la información suministrada por un sistema de diagnóstico de fallas y alertas, con el fin de determinar los planes de monitoreo y control adecuados, prolongando la vida útil de los componentes.
Objetivo: Este trabajo tiene como objetivo principal desarrollar una metodología para analizar el comportamiento de transmisiones de camiones mineros en estado operativo. Su finalidad es establecer, de acuerdo con las condiciones actuales del componente, una posible vida remanente en la que se determine si se encuentra dentro de rangos permisibles o si por el contrario se deben tomar acciones que garanticen un ciclo de vida aceptable.
Metodología: Este artículo muestra el despliegue de la metodología para el análisis y diagnóstico del componente, dividido en cuatro etapas: (i) establecimiento de límites operacionales permisibles para análisis de las condiciones del aceite; (ii) generación de matriz de cambios modelo; (iii) análisis de eventos o fallas asociados con la transmisión; y (iv) mejoramiento de la vida útil del componente.
Resultados: Mediante la aplicación de la metodología se pudo determinar las causas principales de los fallos de las transmisiones y su relación con los parámetros operacionales analizados.
Conclusiones: La investigación busca generar resultados en tiempo real que faciliten la organización de las actividades preventivas y correctivas del componente, necesarias para la óptima operación del mismo.
Análisis CFD del comportamiento del flujo de aire en el sistema de admisión de un motor diésel de baja cilindrada
Authors: Santos Carlos , Perez Luis , Duarte Forero Jorge
Published: July 2024

Introducción— El análisis del flujo de aire, en Motores de Combustión Interna expone un gran desafío para los investigadores debido al comportamiento que presenta el aire dentro del cilindro, el cual se caracteriza por ser turbulento, inestable, cíclico y no estacionario tanto espacial como temporalmente. El presente estudio propone implementar de un modelo de turbulencia a través de un análisis de Dinámica de Fluidos Computacional (CFD) que permita simplificar el fenómeno para motores de baja cilindrada y describa los parámetros que repercuten en la eficiencia y emisiones del motor.
Objetivos— El presente estudio busca analizar el comportamiento del flujo de aire en el sistema de admisión de un motor Diésel de baja cilindrada con aspiración natural a través de un modelo experimental ajustado mediante un modelado CFD.
Metodología— Se realizó el análisis del comportamiento del flujo de aire en el sistema de admisión del motor con un modelo experimental que obtiene las características del flujo. Este modelo es ajustado mediante herramientas CFD en OPENFOAM®, que permitirá obtener el Coeficiente de Descarga (CD) y el Coeficiente de Torbellino (CT) para describir el comportamiento aerodinámico del sistema de admisión.
Resultados— Para el CD, los valores oscilan entre 0 L/D y 0.5 L/D indicando que este motor es capaz de trasegar un 50% de aire de la capacidad teórica con una válvula de 30.5 mm de diámetro y una cámara de 0.3 L de volumen. En cuanto al CT, para un área de referencia variable, los valores oscilan entre 0.19 L/D y 0.3 L/D, por lo que el motor solo disminuiría un 11% su capacidad de trasegar flujo de aire de la capacidad ideal, si el flujo másico teórico va en aumento para cada levantamiento.
Conclusiones— Se puede concluir que para 3000 rpm y 3400 rpm se produce un vórtice definido bajo la metodología propuesta, obteniendo valores de velocidad muy cercanos a 10 m/s y 20 m/s en la periferia, que aseguran el flujo de aire con vorticidad en el cilindro. A 3400 rpm el CT se eleva con respecto a los demás regímenes en los últimos levantamientos de válvula. Concluyendo así, que bajo este régimen de giro se da el punto óptimo de generación de vorticidad para el motor que permite reducir las emisiones e incrementar le eficiencia global.
Simulación de la pasteurización de la cerveza considerando el efecto del envase de vidrio, utilizando dinámica de fluidos computacional
Authors: Perez Colas Misdelki , Nápoles García Martha Faustina , De la Cruz Aragoneses María de Lourdes
Published: July 2024

Introducción: La simulación del proceso de pasteurización de la cerveza embotellada, considerando el sistema cerveza-CO2-vidrio, permite obtener resultados más reales sobre el comportamiento de la convección libre.
Objetivo: El objetivo del presente trabajo es analizar el efecto del envase sobre los resultados de los perfiles de velocidad, temperatura y en las unidades de pasteurización en las zonas de calentamiento inicial, pasteurización y enfriamiento final.
Metodología: Se emplea la dinámica de fluidos computacional con el software COMSOL Multiphisics V 5.1.
Resultados: Se obtienen diferentes comportamientos en los perfiles de velocidad y temperatura de la cerveza, por la reducción del tiempo de intercambio efectivo entre la cerveza y el agua, porque el vidrio debe alcanzar la estabilidad térmica, provocando incrementos de la fuerza impulsora y reducción del tiempo de retención de la temperatura que garantiza la letalidad microbiana.
Conclusiones: Los valores de las unidades de pasteurización a la salida son más elevados que lo recomendado comprometiendo las propiedades organolépticas de la cerveza.
Calidad de agua para riego de 60 fincas agroecológicas de 4 municipios del departamento de Boyacá
Authors: Guerrero Guio Juan Carlos , Castellanos González Leónides , Rodríguez Cely Neldy Tatiana
Published: July 2024

Introducción: La disponibilidad adecuada y calidad del agua es uno de los factores más importantes para el desarrollo sostenible de una región, en agricultura esta puede tener efecto en la nutrición de las plantas por lo cual se hace necesario su evaluación.
Objetivos: Evaluar la calidad de agua para riego de 60 fincas de cuatro municipios del departamento de Boyacá los cuales formarían parte de un proyecto agroecológico.
Metodología: En cada municipio se establecerían tres modelos agroecológicos y cinco fincas/modelo para un total de 15 fincas por municipio, se tomaron dos muestras por finca replicadas en el tiempo con una hora de diferencia para un total de 120 muestras en los cuatro municipios. Las variables analizadas en laboratorio fueron 5 cationes, 6 aniones, hierro, manganeso, zinc, boro y cobre, dureza total, potencial de hidrogeno, conductividad eléctrica y relación de absorción de sodio.
Resultados: El agua de todas las fincas es apta para uso agrícola con fines de riego, aunque en algunas fincas se presentan restricciones de uso por bicarbonato, hierro, manganeso, boro, dureza total y pH.
Conclusiones: Las fuentes de abasto del agua muestreadas para las 60 fincas permiten que sean usadas como agua para el riego agrícola, algunas presentan restricciones por altas concentraciones de hierro, manganeso y boro, también se observan altos coeficientes de variación en algunas variables y bajas concentraciones de potasio, magnesio y calcio, lo que constituye una preocupación por la influencia que podría tener en el desarrollo de los cultivos dentro de un mismo modelo agroecológico.
Detección de espectro en banda ancha Sub-Nyquist para redes Radio Cognitiva: compleción de matrices mediante valores semilla
Authors: Erazo De La Cruz Olger Ferledy , Miramá Pérez Víctor Fabián , Mora Arroyo Jorge Edison
Published: July 2024

Introducción: La Radio Cognitiva (CR) hace un uso eficiente del recurso radioeléctrico, para ello realiza la Detección de Espectro (SS) con el fin de identificar el espectro disponible. Pero debido a la rápida evolución de los transceptores, la microelectrónica y las altas frecuencias de propagación, se hace necesario que en CR se apliquen algoritmos de SS en bandas de frecuencia y se realice un muestreo inferior a la tasa de Nyquist.
Objetivo: Adaptar un algoritmo para Detección de Espectro Sub-Nyquist en Banda Ancha (WBSS) para redes de CR mediante la Compleción de Matrices (MC) que integra valores semilla a partir de las muestras conocidas, con el fin de completar las entradas no muestreadas de la banda a evaluar, reconstruir las señales e identificar el espectro disponible.
Metodología: Se realizó una adaptación al algoritmo Aproximación Matricial de la Zona de Interés (IZMA), para ello se diseña la etapa de reconstrucción y se elige un método de detección de espectro en banda estrecha para conformar el banco de detectores; el algoritmo que se denomina IZMA_SV es evaluado a nivel de simulación, por tanto se reconstruyen señales determinísticas en diferentes SNR y se identifica el estado del canal como ocupado o libre.
Resultados: Las simulaciones indican que el algoritmo adaptado presenta diferencias entre los valores conocidos de la matriz de muestreo M y la matriz recuperada X en SNR inferiores a -8 dB, mientras que la diferencia tiende a cero en SNR superiores a 2 dB.
Conclusiones: El algoritmo IZMA-SV logra reducir el número de operaciones para llegar a la matriz aproximada X, reconstruyendo señales muestreadas al 75% de la tasa Nyquist y aún con un muestreo del 20% se mantienen las características de la señal que hacen posible la detección de espectro en banda ancha.
Liquid Nitrogen as promotor of seeds germination and seedling growth in tropical legumes
Authors: Acosta Fernández Yanier , Fontes Marrero Dayami , Martínez Montero Marcos Edel
Published: July 2024

Introduction: The hard seed is the main cause of dormancy in most of the Leguminoseae species. Seed scarification methods, where physical damage is sought to break hard seed coat without diminishing quality, have been modified over time to make them more effective. The most commonly used seed scarification methods include heat, mechanical scarification, and freeze-thaw. Some methods for freeze-thaw scarification include ultra-low temperature immersion in liquid nitrogen (LN, -196 ° C).
Objective: Determine the effectiveness use of Liquid nitrogen (LN) as a scarification method to overcome dormancy in seeds of species of the Leguminoseae family.
Methodology: The physiological quality of all freshly harvested seeds was determined and scarified by direct immersion in LN for 30 minutes. Total germination was determined under laboratory conditions, as well as the time required for the seeds to reach 50% germination (T50) and the total number of seeds that remained hard at the end of the experiment. The percentage of emerged seedlings and their vegetative growth was evaluated for 21 days after sowing.
Results: The seeds of all species evaluated showed a high physiological quality at the time of harvest. Scarification with LN improved germination, emergence and vegetative growth in the species Desmodium scorpiorus, Teramnus labialis, Neonotonia wigthii and Phueraria phaseoloides.
Conclusions: Dormancy was effectively overcome in the seeds of the species D. scorpiorus, T. labialis, N. wigthii and P. phaseoloides. It was possible to increase the percentage and speed of germination and emergence, managing to obtain plants with greater vegetative growth during the first 21 days after sowing.
Environmentally sustainable universities: the Nueva Granada Campus of the Nueva Granada Military University and its relationship with water
Authors: Ivanova Yulia , Hurtado Rodríguez Rosa Isabel , Gutiérrez Wills Manuel Santiago
Published: July 2024

Introduction: The Nueva Granada campus headquarters of the Nueva Granada Military University was built responding to global trends in modern architecture to be in harmony with the environment through its bioclimatic constructions, lighting based on photovoltaic energy and management of water resources. However, the constant growth of the academic offer, the infrastructure and the university community demand a greater use of natural resources, essential for the proper functioning of the headquarters. One of these resources is water.
Objective: the work evaluated the sustainability of water management in the campus of the university.
Methodology: This evaluation was carried out using the Water Resource Sustainability Index with the integration of the water footprint concept.
Results: It was obtained that the university has made efforts for the efficient management of water resources. However, these are not enough to evaluate water management as sustainable.
Conclusions: Considering this result, it is concluded that the university must formulate improvement actions in the technological and institutional management aspects that will allow to maintain stable water consumption under the scenario of the university's growth, reduce the pollution of the discharges and impact in a positive way on the evapotranspiration, as a fundamental part of the return of water to the environment.
VIGHUB: a Technology Forecasting Tool based on Mining Software Repositories
Authors: Hidalgo-Suarez Carlos Giovanny , Bucheli-Guerrero Victor Andres , Ordoñez-Eraso Hugo Armando
Published: July 2024

Introduction: Academics, developers, and companies focused on technological development seek to know what exists and what is still missing in this field. One of the ways they use is the review of bibliographic sources (state-of-the art). In this sense, a tool was developed that allows the current state to be identified semi-automatically.
Objective: This article proposes a tool that extracts information from repositories hosted on GitHub. It analyzes the data using computational techniques and presents the results through visualizations that identify the field's technological evolution studied through the most used programming languages, central repositories, and organizations.
Method: A model based on Mining Software Repositories (MSR) is used, which integrates an architecture based on microservices, using different programming languages, which allowed the construction of the VigHub tool. The model focuses on four aspects: Selection of a topic, extraction of the data source, analysis of information using computational techniques, and finally, the results are communicated through visualizations.
Results: The VigHub tool was available online to carry out 3 case studies. The first in the academy, where technologies, programming languages, users, and companies interested in developing VLE's (Virtual Learning Environment) were identified from 2011 to 2021. The second and third were carried out by companies (industrial environment), which stated that using the VigHub tool supports data analysis and valuable results identification.
Conclusions: A tool that allows identifying a part of the current state of technology could be a helpful tool for academics, developers, and companies, saving human resources, time, and possible repeated developments---code reuse. The VigHub tool aims to support the construction of state-of-the-art. Its results are complementary to the traditional method.
Capacity of center pivot systems and emitter discharges for citrus irrigation. A case study
Authors: Fernández Hung Kaddiel , Vargas Rodríguez Pável , Cueto Rodríguez Jorge Rolando , Brown Manrique Oscar Nemesio
Published: July 2024

Introduction— Given the reduction in water resources, irrigation should be carried out with the highest application efficiency. Irrigation pivots achieve application efficiencies close to localized systems; however, for citrus irrigation, the equations available for its design and management do not contribute to the efficient and rational use of water.
Objective— Adapt the expression of the capacity of the machine and propose a new formulation for the discharge of the emitters, to adequately describe the operation of the central pivots for citrus irrigation.
Methodology— Logical research methods were used and within these, the historical method and the deductive logic, to obtain the adequacy and the new equations presented.
Results— The expression of the α coefficient was obtained to adapt the expression of the capacity of the machine and two new equations to calculate the necessary discharges of the emitters. They were applied to a case study.
Conclusions— It was confirmed that the center pivot machines to irrigate citrus obtain water consumption and application efficiency comparable could with localized irrigation systems.
Sistema de georreferenciación y rescate para aeronaves no tripuladas
Authors: Calderon Vega Harold Yesid , Castañeda Pabón Daniel Eduardo , Camargo Casallas Esperanza
Published: July 2024

Introducción: Se desarrolló un dispositivo que puede ser acondicionado para aeronaves no tripuladas, este dispositivo lo que permite es que en caso de que una aeronave caiga y se pierda en una zona no especifica, a través del mismo se logre el rescate de la aeronave enviando la coordenada en la que se encuentra. Objetivo: Desarrollar un sistema de georreferenciación para aeronaves no tripuladas implementando un sistema electrónico el cual pueda codificar y transmitir los datos de su posición actual, además desarrollar un sistema de visualización mediante un circuito detectable a dispositivos estroboscópicos alimentando estas dos partes por medio un prototipo el cual proporcione energía alternativa, todo esto dentro de un sistema contra impactos. Metodología: Es un dispositivo que envía la coordenada utilizando la placa pi in the sky la cual posee el módulo transmisor Radiometrix, para estos se realizaron pruebas a una base remota donde un computador con una serie de programas decodificara y mostrara la posición de esta en tiempo real para posteriormente lograr su rescate. Resultados: Se logró implementar al proyecto la placa Pi in The Sky la cual es capaz de codificar la coordenada para su posterior transmisión a la base usando el módulo Radiometrix, llegando a transmisiones de más 11km comprobando el robusto protocolo que usa. Se consiguió implementar un circuito estroboscópico que cumple con las exigencias del proyecto, obteniendo características a favor como lo es su intensidad lumínica y larga duración que está alrededor de las 72 Horas activas.  Conclusiones: Con éste trabajo investigativo se concluye que el proyecto logra transmisiones a más de 11k m de distancia a una base remota sin ningún percance y con ello obteniendo una trama de datos (latitud longitud y altitud en metros) para lograr su georreferenciación en todo momento.