Publicações - ciências exatas e da terra
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José Guilherme de Oliveira;
Leonardo José Cordeiro Santos;
Rodrigo Marcos de Souza;
Inocêncio de Oliveira Borges Neto;
Eduardo Vedor de Paula;
Jaqueline Dittrich
Palavra-chave:
produção de sedimentos;
Processos erosivos;
monitoramento ambiental
Áreas do conhecimento:
Ciências Exatas e da Terra; Geociências; Geografia Física; Geomorfologia
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Abraão Jessé Capistrano de Souza;
GUTIÉRREZ-PIÑERES, ANTONIO C.;
COIMBRA-ARAUJO, CARLOS H.
Palavra-chave:
black holes;
Nash-Greene theorem;
embeddings
Áreas do conhecimento:
Ciências Exatas e da Terra; Física; Física Geral; Física Clássica e Física Quântica; Mecânica e Campos
resumo ...
We investigate a rotating black hole embedded in a five-dimensional flat bulk by extending the Kerr metric through the Gürses-Gürsey line element. Employing Boyer-Lindquist coordinates, we reinterpret the black hole as a charged-like object in five dimensions and analyze its horizon structure and shadow morphology. Our results reveal that the shadow is shaped by an axially symmetric gravitational field modulated by an extrinsic curvature term arising from the higher-dimensional embedding. Simulations demonstrate that the visibility amplitude and shadow profile of the Gürses-Gürsey black hole align with Event Horizon Telescope observations of $$\hbox {M87}^{*}$$ in the Kerr limit, while also allowing measurable deviations that could be probed by future high-resolution experiments.
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Sehjal Khandelwal;
Abraão Jessé Capistrano de Souza;
suresh kumar
Palavra-chave:
Dark energy;
modified gravity;
Cosmological perturbations;
Numerical cosmology
Áreas do conhecimento:
Ciências Exatas e da Terra; Física; Física Geral; Física Clássica e Física Quântica; Mecânica e Campos
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SCATOLIN, MATHEUS FERRACCIÚ;
Hélio Pedrini
Áreas do conhecimento:
Ciências Exatas e da Terra; Ciência da Computação; Metodologia e Técnicas da Computação; Engenharia de Software
resumo ...
(en)
While Large Language Models (LLMs) offer transformative potential for automating customer support, significant hurdles remain concerning their reliability, explainability, and consistent performance in complex, sensitive interactions. This paper introduces STELLAR (Structured, Trustworthy, and Explainable LLM-Led Architecture for Reliable Customer Support), a novel architectural blueprint designed to address these issues. STELLAR utilizes a Directed Acyclic Graph (DAG) structure composed of nine specialized modules and eleven predefined workflows to orchestrate support interactions in a structured and predictable manner. This design promotes enhanced traceability, reliability, and control compared to less constrained systems. The architecture integrates components for few-shot classification, Retrieval-Augmented Generation (RAG), urgency-aware human escalation, compliance verification, user interaction validation, and knowledge base refinement through a semi-automated loop. This modular design deliberately balances LLM-driven innovation with operational requirements such as human-in-the-loop integration and ethical safeguards through embedded checks. We evaluated the core modules of STELLAR in key tasks - classification, retrieval, and compliance - demonstrating strong performance and reliability. Together, these features position STELLAR as a robust and transparent foundation for the next generation of intelligent, reliable customer support systems.
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TRAMONTINI STEFFEN, BRENO;
DE SOUZA, RONALD BUSS;
PEREIRA DE FREITAS, ROSE ANE;
Mauricio Almeida Noernberg;
KLOSE PARISE, CLAUDIA
Palavra-chave:
ITCZ;
PIRATA Program;
Ocean?s Mixed Layer;
Trade Winds;
Western Tropical Atlantic;
Ocean?Atmosphere Interaction
Áreas do conhecimento:
Ciências Exatas e da Terra; Oceanografia; Oceanografia Física; Interação do Oceano com a Atmosfera
resumo ...
In the Atlantic Ocean, the Intertropical Convergence Zone (ITCZ) sustains the climate of northeastern Brazil and northwestern Africa by modulating their rainy and dry seasons. Using observational data, radiosondes and Expendable Bathythermographs (XBTs), we investigated short-term ocean–atmosphere coupling across the ITCZ region along the 38° W meridian. The data represents synchronous measurements of the marine atmospheric boundary layer (MABL) and the ocean’s mixed layer (OML) for the period between 17 October and 8 November 2018. The ITCZ demonstrated pronounced variability in position, intensity, and width, driven by the changes in the predominance of northeast and southeast trade winds. These atmospheric changes directly impacted the Equatorial Divergence (ED), which transitioned from an asymmetric structure with shallower isothermal layer depths (ILDs) (~−14 m) around 11° N to a more homogenous region between 5° N and 10° N, with an average ILD of −21.83 ± 5.23 m. A comparison with ORAS5 and WOA23 indicates that the products reproduce the vertical thermal structure of the WTAO well (r2 > 0.9) but systematically overestimate the temperature at the bottom of the ILD by 3–4 °C. The difference between the ILD and the mixed layer depth (MLD) is more pronounced south of the ED due to the Amazon River salinity front, advected by the NECC, but the ILD estimated from XBT data closely matches the MLD estimated for ORAS5 and WOA23 in the ED region. These unprecedented observations showcase, for the first time, short-term ocean–atmosphere coupled variability across the WTAO ITCZ region, highlighting the importance of atmospheric synoptic-scale processes in modulating the OML and the ED.
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Diogo Montes Vidal;
SAAD, EMIR B.;
CORACINI, MIRYAN D. A.;
PEREIRA, RAFAEL C. G.;
THOMAZINI, MARCÍLIO J.;
QUERO, CARME;
BOSCH, MARIA P.;
GUERRERO, ÁNGEL;
Paulo Henrique Gorgatti Zarbin
Palavra-chave:
conjugated dienes;
gc-ead;
yerba-mate tree;
chemical ecology;
Sex Pheromone
Áreas do conhecimento:
Ciências Exatas e da Terra; Química; Química Orgânica; Evolução, Sistemática e Ecologia Química;
Ciências Exatas e da Terra; Química; Química Orgânica; Síntese Orgânica;
Ciências Exatas e da Terra; Química; Química Orgânica; Química dos Produtos Naturais
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SILVA, DAMARES CRISTINA FATIMA;
Carla Cristina Pompeu
Áreas do conhecimento:
Ciências Exatas e da Terra; Matemática; Educação Matemática
resumo ...
(en)
This article aims to investigate, based on teachers’ narratives, whether the curricular policy and the Political-Pedagogical Project (PPP) of rural schools in a municipality in the Triângulo Mineiro region favor the recognition of numeracy practices related to peasant social practices. The qualitative research was conducted with six teachers working in rural schools in the municipal network. Semi-structured interviews were used as data production instruments, which were analyzed in light of the concepts of teacher literacy, numeracy, and studies on curricular policies. The teachers’ narratives reveal gaps between the prescribed curricular proposal and the pedagogical practices of teachers working in rural schools, although individual efforts to mediate between the prescribed curriculum and the reality experienced by students are noticeable. There is also a lack of teacher training focused on the specificities of Rural Education, which compromises the articulation between official documents and teaching practices. It is concluded that it is urgent to develop curricular proposals that take into account local knowledge and rural culture, particularly to promote Mathematical Education for the Countryside, as well as the promotion of ongoing teacher training for the development of a critical education and appreciation of the Countryside.
(es)
Este artículo tiene como objetivo investigar, a partir de las narrativas de los docentes, si la política curricular y el Proyecto Político-Pedagógico (PPP) de las escuelas rurales de un municipio de la región del Triángulo Mineiro promueven el reconocimiento de las prácticas numéricas relacionadas con las prácticas sociales campesinas. La investigación cualitativa se realizó con seis docentes que trabajan en escuelas rurales dentro de la red municipal. Se utilizaron entrevistas semiestructuradas como herramientas de recolección de datos, que se analizaron a la luz de los conceptos de alfabetización docente, aritmética y estudios sobre políticas curriculares. Las narrativas de los docentes revelan brechas entre la propuesta curricular prescrita y las prácticas pedagógicas de los docentes de las escuelas rurales, aunque son notables los esfuerzos individuales para mediar entre el currículo prescrito y la realidad vivida por los estudiantes. Además, existe una falta de formación docente centrada en las especificidades de la educación rural, lo que compromete la conexión entre los documentos oficiales y las prácticas docentes. Se concluye que es urgente desarrollar propuestas curriculares que contemplen los saberes locales y la cultura campesina, particularmente para la promoción de la Educación Matemática Rural, así como la promoción de la formación continua docente para el desarrollo de una educación crítica y de valoración del campo.
(fr)
Cet article est guidé par l'objectif de rechercher, à partir des récits des enseignants, si la politique curriculaire et le Projet Politico-Pédagogique (PPP) des écoles de Campo de Uberaba-MG favorisent la reconnaissance des pratiques de calcul liées aux pratiques sociales de Campo. La recherche, de nature qualitative, a été réalisée auprès de six enseignants travaillant dans les écoles rurales du réseau municipal d'Uberaba-MG. Des entretiens semi-structurés ont été utilisés comme instruments de production de données, qui ont été analysées à la lumière des concepts d'enseignement de l'alphabétisation, de la numératie et des études sur les politiques curriculaires. Les récits des enseignants révèlent des écarts entre la proposition de programme prescrit et les pratiques pédagogiques des enseignants qui travaillent dans les écoles rurales, bien que des efforts individuels soient perceptibles dans une tentative de médiation entre le programme prescrit et la réalité vécue par les élèves. Il existe également un manque de formation des enseignants axée sur les spécificités de l'éducation rurale, ce qui compromet l'articulation entre les documents officiels et les pratiques pédagogiques. On conclut qu'il est urgent de construire des propositions curriculaires qui prennent en compte les savoirs locaux et la culture paysanne, en particulier pour la promotion de l'enseignement des mathématiques rurales, ainsi que la promotion de la formation continue des enseignants pour le développement de l'éducation critique et de l'appréciation de la campagne.
(pt)
Este artigo orienta-se pelo objetivo de investigar, a partir das narrativas dos professores, se a política curricular e o Projeto Político-Pedagógico (PPP) das escolas do Campo de um município do Triângulo Mineiro favorecem o reconhecimento de práticas de numeramento relacionadas com as práticas sociais camponesas. A pesquisa, de cunho qualitativo, foi realizada com seis professores atuantes em escolas no/do Campo da rede municipal. Utilizaram-se entrevistas semiestruturadas como instrumentos de produção de dados, os quais foram analisadas à luz dos conceitos de letramento docente, numeramento e dos estudos sobre políticas curriculares. As narrativas dos professores revelam distanciamentos entre a proposta curricular prescrita e as práticas pedagógicas dos docentes que atuam em escola do campo, embora seja perceptível esforços individuais na tentativa de mediação entre o currículo prescrito e a realidade vivida pelos estudantes. Observa-se ainda a carência de formação docente voltada para as especificidades da Educação do Campo, o que compromete a articulação entre os documentos oficiais e as práticas de ensino. Conclui-se que é urgente a construção de propostas curriculares que contemplem os saberes locais e a cultura camponesa, em particular para a promoção de uma Educação Matemática do Campo, bem como a promoção de formação continuada de professores para o desenvolvimento de uma educação crítica e de valorização do Campo.
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DE OLIVEIRA, GABRIEL BIANCHIN;
Hélio Pedrini;
DIAS, ZANONI
Áreas do conhecimento:
Ciências Exatas e da Terra; Ciência da Computação; Metodologia e Técnicas da Computação; Engenharia de Software
resumo ...
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Felipe Moreira Pinto;
Felipe A. La Porta;
WYPYCH, FERNANDO
Palavra-chave:
Dissulfeto de molibdênio;
Materiais Lamelares
Áreas do conhecimento:
Ciências Exatas e da Terra; Química; Engenharia e Ciencia de Materiais; Materiais de Baixa Dimensionalidade Estrutural
resumo ...
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MACIEL, DANIEL ANDRADE;
FASSONI-ANDRADE, ALICE;
JÚNIOR, ROGÉRIO FLORES;
LIMA, THAINARA;
LOPES, FERNANDO;
MARINHO, ROGÉRIO RIBEIRO;
MARTINELLI, ANDRÉ;
MARTINS, VITOR S.;
MIRANDA, MARCELA;
CESAR, GABRIEL MOIANO;
DA MOTTA MARQUES, DAVID;
BARBOSA, CLAUDIO CLEMENTE FARIA;
Mauricio Almeida Noernberg;
DE MORAES NOVO, EVLYN MÁRCIA LEÃO;
WANDERLEY, RAIANNY LEITE DO NASCIMENTO;
BACELLAR, PEDRO;
BAIA, LOHAN BARBOSA;
BERNINI, HENRIQUE;
CHASLES, RAFAEL G.;
CIOTTI, AUREA;
et.al
Palavra-chave:
Qualidade da Água;
sensoriamento remoto;
Banco de dados abertos;
Bio-óptica
Áreas do conhecimento:
Ciências Exatas e da Terra; Geociências; Sensoriamento Remoto; Monitoramento Ambiental
resumo ...
Understanding water quality (WQ) is essential for grasping biogeochemical cycles and assessing human impacts such as deforestation, climate change, dam construction, illegal mining, and urbanization. However, monitoring WQ across Brazil’s vast aquatic systems requires significant resources. Remote sensing improves this process by offering high-resolution and large-scale observations. Nevertheless, to produce reliable remote-sensing WQ products based on remote sensing demands comprehensive datasets with concurrent aquatic reflectance and in situ measurements (e.g., Chlorophyll-a, Secchi Disk Depth, Suspended Sediments). Such data enables advanced semi-analytical and machine learning models to capture Brazil’s bio-optical water complexity. Collaborative efforts and open-data sharing are essential for building these datasets. Here, we introduce a new curated, high-quality bio-optical dataset across different aquatic systems in Brazil, called BRAZA (Bio-optical aquatic database for remote sensing of water quality in BRAZil coAstal and inland waters). By leveraging data from 17 institutions, covering 2,895 stations across + 128 lakes, rivers, reservoirs, and coastal areas of Brazil’s five administrative regions our dataset presents an important contribution to support remote sensing WQ-based analysis in Brazil.
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