Record of Semiotic Representation Using Geogebra: An Olympiad Training on Brazilian Students

This study aims to compile and develop an international didactic situtation presented with an approach to the center of an arbitrary triangle in visual exploration in 2D and 3D format using GeoGebra software as a technology for modification and construction of Olympiad questions. The methodology used in this study is an exploratory qualitative which is described from a didactic sequence of Mathematics Olympiad which were held in four online meetings using Google Meet. The results show that this exercise can be used as a resource that will provide a level of learning for students through command and visualization of images that serve a broad view of the international Olympiad situation. International didactic situations can be applied by mathematics teachers both in training for national and international Olympiad and for classroom teaching. In summary, it is noteworthy that the dynamic records of semiotic representations stimulated by the use of GeoGebra software has great potential to encourage the progress of students’ representative geometric thinking, through the development of visualization, perception, and mathematical intuition. It is hoped that this work can serve as a pedagogical and methodological tool by teachers for various competencies

Development of Technology-Based Teaching Materials in Islamic Religious Education Subjects

The purpose of this study is to describe and analyze the development of teaching materials, and the level of feasibility of using technology-based teaching materials in learning Islamic Religious Education. This research is a type of research and development (Research and Development). By using the four-D (4-D) model developed by Thiagarajan (Define, Design, Develop, and Disseminate). The results of this study, according to media and material experts, show that the teaching materials developed have very feasible criteria with an average score of 4.65, both according to media experts and material experts based on their aspect assessment. Meanwhile, according to students' responses, they have an average score of 4.25 with very decent teaching material assessment criteria. Tujuan dari penelitian ini adalah untuk mendeskripsikan dan menganalisis pengembangan bahan ajar, dan tingkat kelayakan penggunaan bahan ajar berbasis teknologi dalam pembelajaran Pendidikan Agama Islam. Penelitian ini merupakan jenis penelitian dan pengembangan (Research and Development). Dengan menggunakan model four-D (4-D) yang dikembangkan oleh Thiagarajan (Define, Design, Develop, and Disseminate). Hasil penelitian ini, menurut ahli media dan ahli materi, menunjukkan bahwa bahan ajar yang dikembangkan memiliki kriteria sangat layak dengan skor rata-rata 4,65, baik menurut ahli media maupun ahli materi berdasarkan aspek penilaian mereka. Sementara itu, menurut respon siswa, bahan ajar tersebut memiliki skor rata-rata 4,25 dengan kriteria penilaian bahan ajar yang sangat layak

Sobre a noção de Situação Didática Olímpica aplicada ao contexto das Olimpíadas Internacionais de Matemática

O presente artigo apresenta uma ordem teórico-conceitual específico de uma estruturação da investigação em Didática da Matemática com a finalidade de mostrar uma discussão e a oportunidade do alcance de conhecimentos didático-metodológicos envolvendo o ensino de Geometria Plana por meio de Problemas Olímpicos obtidos das avaliações da Olimpíada Internacional de Matemática. O objetivo do trabalho é realizar uma Engenharia Didática pretendendo a estruturação de uma Situação Didática Olímpica, com ênfase no ensino de Geometria Plana, com o apoio do softwareeducacional GeoGebra como recurso tecnológico com o propósito de proporcionar a compreensão de novas resoluções aos alunos por meio dos comandos e visualização das figuras expostas na situação-problema didática olímpica. Foi utilizada a metodologia de Michèle Artigue (1988), a Engenharia Didática enumerado nas suas primeiras fases: Análises preliminares e Concepção e Análise a priori da situação didática, com dedicação à concepção e a modelização de figuras planas de uma situação-problema olímpica em acréscimo com a Teoria das Situações Didáticas de Guy Brousseau (1986) e o software educacional GeoGebra como recurso tecnológico colaborando na construção junto aos comandos operacionais e a visualização da figura. Essa proposta tem importância em uma Situação Didática Olímpica para os professores de matemática promover momentos de interação que favoreceram a execução em sala de aula ou na preparação de procedimentos para a Olimpíada Internacional de Matemática, ou seja, para um melhor planejamento e na aprendizagem metodológica aplicada no ambiente escolar

CONTRATO DIDÁTICO NO ENSINO REMOTO: UM CONTRIBUTO PARA O ESTUDO DE ÁREA ALIADO AO SOFTWARE GEOGEBRA

El aprendizaje a distancia se aplica en situaciones de emergencia, donde las clases tienen lugar fuera del espacio físico, el aula, y luego en línea. Este trabajo presenta un modelo de enseñanza basado en la Teoría de Situaciones Didácticas (TSD) y apoyado en el software GeoGebra, como una forma de facilitar el aprendizaje de los estudiantes. El objetivo es describir una propuesta didáctica para la enseñanza del área de figuras planas, estableciendo un contrato didáctico en el entorno remoto. En el desarrollo se utilizará la Ingeniería Didáctica (DE) como metodología de investigación, desarrollando sus dos primeras fases (análisis preliminar y concepción y análisis a priori), buscando favorecer un entorno para la construcción del conocimiento. Un gran desafío para el aprendizaje remoto es el acceso a internet, ya que muchos estudiantes usan una conexión muy inestable, otros usan sus propios datos móviles y todavía hay estudiantes que ni siquiera tienen internet en casa, desafortunadamente, esto sigue siendo un problema en muchas ciudades brasileñas.O ensino remoto é aderido em situações emergenciais, nas quais as aulas acontecem fora do espaço físico, a sala de aula, ocorrendo então de forma on-line. O presente trabalho apresenta um modelo de ensino baseado na Teoria das Situações Didáticas (TSD) e amparado pelo software GeoGebra, como forma de facilitar a aprendizagem dos estudantes. Assim, objetiva-se descrever uma proposta didática para o ensino de área de figuras planas, estabelecendo um contrato didático no ambiente remoto. No desenvolvimento, será utilizada a Engenharia Didática (ED) como metodologia de pesquisa, desenvolvendo suas duas primeiras fases (análises preliminares e concepção e análises a priori) e buscando favorecer um ambiente de construção do conhecimento. Um grande desafio para o ensino remoto é o acesso à internet, pois muitos estudantes utilizam uma conexão bastante instável, outros fazem uso dos próprios dados móveis e ainda tem alunos que nem possuem internet em casa, o que, infelizmente, continua sendo um problema em muitas cidades brasileiras.Remote teaching is adhered to in emergency situations, where the classes take place outside the physical space, the classroom, taking place online. This paper presents a teaching model based on the Theory of Didactic Situations (TSD) and supported by GeoGebra software, as a way to facilitate student learning. It aims to describe a didactic proposal for teaching the area of plane figures, establishing a didactic contract in the remote environment. In the development we will use Didactic Engineering (DI) as a research methodology, developing its first two phases (preliminary analysis and design and a priori analysis), seeking to favor a knowledge construction environment. A major challenge for remote teaching is access to the internet, because many students use a very unstable connection, others use their own mobile data, and there are still students who do not even have internet at home, unfortunately, this is still a problem in many brazilian cities

Multifractal characterization as a function of timescale in the light curves with planetary signal observed by the Kepler mission: Caracterização multifractal como uma função da escala de tempo em curvas de luz com sinal planetário observada pela missão Kepler

We investigate the evolution of five multifractal indicators of the Kepler Mission light curves of the moderately young Sun-like Kepler-30 star accompanied by a three-planet system. We focus not only on the fact that the rotational modulation has multifractality properties but also on some studies on these properties based on scale. Then, we systematically investigate the dynamic behaviors of the small and large fluctuations in two types of light curves (PDC and SAP). Those fluctuations indicate that the properties of stellar noise and rotation modulation are highlighted when we apply the Multifractal Detrended Moving Average (MFDMA) algorithm. Our results also demonstrated that the multifractality of the light curve is due to both long-range correlation and broad probability density function, but the main source of multifractality is the long-range correlation. This new approach can be used to develop theoretical and computational models for various stellar magnetic activity-related phenomena and their interactions with the planets, and it can greatly simplify spot modeling from current TESS and future PLATO data

Fractal signature as a rotational modulation and stellar noise classifier based on the active kepler stars: Assinatura fractal como um classificador de ruído estelar e modulação rotacional baseada nas estrelas ativas da missão kepler

In this study, we report on the analysis of 701 stars in a solar vicinity defined in three categories namely subsolar, solar, and supersolar with rotation periods between 1 and 70 days, based on rotational modulation signatures inferred from time series from the Kepler mission’s Public Archives. In our analysis, we performed an initial selection based on the rotation period and position in the period–H diagram, where H denotes the Hurst exponent extracted from fractal analysis. To refine our analysis, we applied a fractal approach known as the R/S method, taking into account the fluctuations of the features associated with photometric modulation at different time intervals and the fractality traces that are present in the time series of our sample. In this sense, we computed the so-called Hurst exponent for the referred stars and found that it can provide a strong discriminant of rotational modulation and background noise behavior, going beyond what can be achieved with solely the rotation period itself. Furthermore, our results emphasize that the rotation period of stars is scaled by the exponent H which increases following the increase in the rotation period. Finally, our approach suggests that the referred exponent may be a powerful rotational modulation and noise classifier

Fractal signature as a rotational modulation and stellar noise classifier based on the active Kepler stars

In this study, we report on the analysis of 701 stars in a solar vicinity defined in three categories namely subsolar, solar, and supersolar with rotation periods between 1 and 70 days, based on rotational modulation signatures inferred from time series from the Kepler mission's Public Archives. In our analysis, we performed an initial selection based on the rotation period and position in the period-H diagram, where H denotes the Hurst exponent extracted from fractal analysis. To refine our analysis, we applied a fractal approach known as the R/S method, taking into account the fluctuations of the features associated with photometric modulation at different time intervals and the fractality traces that are present in the time series of our sample. In this sense, we computed the so-called Hurst exponent for the referred stars and found that it can provide a strong discriminant of rotational modulation and background noise behavior, going beyond what can be achieved with solely the rotation period itself. Furthermore, our results emphasize that the rotation period of stars is scaled by the exponent H which increases following the increase in the rotation period. Finally, our approach suggests that the referred exponent may be a powerful rotational modulation and noise classifier.Comment: 18 pages, 5 figures, submitted to BJ

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio

Avanços da cirurgia robótica no tratamento de doenças cardiovasculares

Várias cirurgias médicas já utilizaram a tecnologia robótica, tais como: cirurgias no estômago, bexiga, rins, próstata, cérebro e inclusive no coração, o qual proporciona-se a reparação de válvulas cardíacas e até mesmo cirurgias nas artérias. O principal objetivo do presente estudo é discutir por meio da literatura científica acerca dos avanços da cirurgia robótica no tratamento de doenças cardiovasculares. Trata-se de uma revisão sistemática da literatura, dos quais, utilizou-se as bases e biblioteca eletrônica Scielo e Periódico Capes, totalizando 5 artigos elegíveis. A cirurgia robótica tem sido um dos principais métodos utilizados em tratamentos cardiovasculares quando comparados com técnicas convencionais, sobretudo, no que diz respeito, a cirurgia de revascularização do miocárdio