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On text organization and instantiation from a systemic functional perspective.
No full textThe paper departs from instantiation to explore text in relation to the quantitative
properties of language — more specifically how probability plays a part in the
matching of an instance and a particular socially-oriented use. Such matching
not only links instantiation and stratification, but also helps explaining how
different context configurations (patterns of register and genre) are accordingly
related to steps in subpotentialization. The fact that language is an inherently
probabilistic system may yield a quantitative account of this process if a more
complete modelling of language is to be obtained. As part of our exploration,
we compiled a corpus of procedures and applied dynamics modelling to tease
out quantitative properties of instances associated with context. We described
some properties of instantiation — reweighting, association, and dynamics —,
which determine the probabilities of an instance configuration, as they also be-
have following register variation. The paper goes on to show quantitatively how
the process of subpotentialization is obtained, leading up to a complementary
definition of ‘text’ as a probable unit of instantiation.The paper departs from instantiation to explore text in relation to the quantitative
properties of language — more specifically how probability plays a part in the
matching of an instance and a particular socially-oriented use. Such matching
not only links instantiation and stratification, but also helps explaining how
different context configurations (patterns of register and genre) are accordingly
related to steps in subpotentialization. The fact that language is an inherently
probabilistic system may yield a quantitative account of this process if a more
complete modelling of language is to be obtained. As part of our exploration,
we compiled a corpus of procedures and applied dynamics modelling to tease
out quantitative properties of instances associated with context. We described
some properties of instantiation — reweighting, association, and dynamics —,
which determine the probabilities of an instance configuration, as they also behave following register variation. The paper goes on to show quantitatively how
the process of subpotentialization is obtained, leading up to a complementary
definition of ‘text’ as a probable unit of instantiation
Biosurfactant by serratia sp. BR13816 : fermentation optimization and nanoemulsion formation.
No full textThe main objective of this study was to optimize the fermentation process using Serratia sp. BR13816, a bacterial isolate from Amazonian soil, and to evaluate the formation of nanoemulsions. Submerged fermentation was carried out with different carbon and nitrogen sources. Based on the emulsification index and surface tension results, we selected a hydrophobic (corn oil) and a hydrophilic (glycerol) carbon source, and a nitrogen one (urea). For fermentation using corn oil/urea greater emulsification indexes and lower surface tensions were verified at pH 8, 25 °C, and 48 h, whereas for glycerol/urea supplemented medium the best conditions were attained at pH 7, 30 °C, and 96 h. These pre-selected factors (pH, temperature, and time) were used in a central composite rotatable design (CCRD) for an additional fermentation optimization of the two carbon/nitrogen mediums, corn oil/urea and glycerol/urea. The two best nutritional systems based on corn oil/urea and glycerol/urea were selected using a central composite rotatable design (CCRD). The mathematical models using the response surface methodology showed adequate adjustment. The best run of the experimental design for corn oil/urea (6.00% /0.60%) and glycerol/urea (3.00% /1.40%) systems presented surface tension values of 35.70 mN/m and 37.10 mN/m, respectively. The nanoemulsions produced by a low-energy method presented average sizes by dynamic light scattering varying from 453.1 nm to 667.3 nm when 0.1% of the oil was employed. Therefore, Serratia sp. BR13816 showed promising biosurfactant-producing potential for future industrial applications
Uma proposta para a aplicação do Método de Newton para o ensino médio : uma experiência com professores de matemática.
No full textPrograma de Pós-Graduação em Matemática em Rede Nacional. Departamento de Matemática, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto.O presente trabalho apresenta uma proposta para o cálculo de raízes de equações não lineares, que normalmente não são vistas no ensino médio, utilizando o Método de Newton em conjunto com o software GeoGebra. O objetivo deste trabalho é criar uma atividade interativa abordando o conceito de derivada de uma maneira alternativa a usual, que se dá pelo uso de limites. Foram desenvolvidos dois roteiros para utilização do GeoGebra e a atividade foi aplicada com professores mestrandos em matemática, em dois dias distintos. Os dados foram obtidos através da percepção e interação dos participantes e com o preenchimento de dois formulários aplicados ao fim de cada encontro.The work presents a proposal for calculating the roots of non-linear equations, which are not normally seen in high school, using the Newton Method in conjunction with the GeoGebra software. The objective of this work is to create an interactive activity approaching the concept of derivative in an alternative way to the usual one, which is done through the use of limits. Two scripts were developed for using GeoGebra and the activity was applied with teachers studying for a master’s degree in mathematics, on two different days. The data were obtained through the perception and interaction of the participants and by filling out two forms applied at the end of each meeting
Rising mollusk bivalves from the ashes : geologic, biostratigraphic and evolutionary implications from tuff data in the Permian Corumbataí Formation, Paraná Basin, Brazil.
No full textDuring the Permian, the southwestern Gondwana margin experienced episodes of intense volcanism tied to the Choiyoi magmatism. Several ash-fall horizons related to this magmatic event are preserved within the Late Paleozoic lake-sea sedimentary record of the Parana ́ Basin. Furthermore, near the Permian-Triassic boundary, a meteor fell in the northern border of the basin, generating unshocked zircon grains preserved in a stratigraphic marker called the Porangaba Bed. In this study, a new U-Pb zircon age of 265.17 ± 3.2 Ma is presented for a volcanic tuff in the upper part of the Corumbataí Formation, near the stratigraphic interval of the Porangaba Bed. In addition, Lu-Hf isotopic compositions of the zircon grains, whole-rock geochemistry, and atmospheric circulation data indicate the affinity of the ash-fall horizon with the Frontal Cordillera source. The combination of these new and previous U-Pb ages allowed us to draw a more realistic scenario of the evolution of bivalve mollusk of the Corumbataí Formation and to improve the use of these macrofossils in the biostratigraphy of the Permian succession of the Paraná Basin. In this context, we established the limits of the Pinzonella neotropica-Jacquesia brasiliensis Association Biozone between 262.38 ± 5.7 Ma and 257.5 ± 2.2 Ma. Hence, in the north and central Paraná Basin the local resolution of this biozone is of ~5 Ma. Moreover, the range of this biozone indicates that the endemic bivalves survived the end-Guadalupian (ca. 259 Ma) extinction event unscathed
Proteção de dados pessoais sensíveis na telemedicina : desafios e soluções regulatórias a partir dos princípios bioéticos e biojurídicos.
No full textPrograma de Pós-Graduação em Direito. Departamento de Direito, Escola de Direito, Turismo e Museologia, Universidade Federal de Ouro Preto.Os dados pessoais sensíveis que trafegam entre os profissionais de saúde e os
pacientes atendidos pela telemedicina estão sujeitos à destinação inadequada, fato
comprovado pelo cenário de crescente vazamento desses dados no Brasil, com
dimensão de danos ainda desconhecida. Nesse cenário, a presente pesquisa busca
solucionar o problema de como conciliar a telemedicina com a necessidade crucial de
proteger dados pessoais sensíveis, mantendo-se em conformidade com os princípios
bioéticos e biojurídicos. O objetivo é buscar instrumentos dentro da principiologia
estudada que possam proteger os pacientes e evitar danos causados pelo uso
inadequado desses dados. A pesquisa se justifica pela necessidade de identificar
possíveis fundamentos teóricos que possam viabilizar a reflexão e construção ética e
normativa para proteção dos dados sensíveis dos pacientes, considerando-se que o
vazamento desses dados pode repercutir negativamente na esfera privada das
pessoas, com diversas violações de direitos. No desenvolvimento, o trabalho adota
como marco teórico uma visão dos princípios baseada nos Direitos Humanos,
presente na Declaração Universal sobre Bioética e Direitos Humanos da UNESCO,
em superação à abordagem utilitarista reportada nos princípios tradicionais do
Relatório de Belmont. Em termos metodológicos, a pesquisa teórica segue o método
indutivo, por meio do qual, partindo dos pressupostos teóricos mencionados,
pretende-se obter conclusões cujo conteúdo seja capaz de contribuir para a solução
do problema apresentado. No tocante às estratégias e procedimentos de coleta de
dados, a pesquisa utiliza o levantamento bibliográfico somado à coleta e análise de
legislação. Por meio da questão levantada, em conjunto com a análise dos institutos
e figuras jurídicas pertinentes, a pesquisa identificou dentro da principiologia estudada
elementos capazes de contribuir para uma reflexão ética e normativa mais
abrangente, assegurando a proteção dos dados pessoais sensíveis na telemedicina.Sensitive personal data that travels between healthcare professionals and patients
treated via telemedicine are subject to inappropriate disposal, a fact proven by the
scenario of increasing leakage of this data in Brazil, with the extent of damage still
unknown. In this scenario, this research seeks to solve the problem of how to reconcile
telemedicine with the crucial need to protect sensitive personal data, while remaining
in compliance with bioethical and biolegal principles. The objective is to search for
instruments within the principles studied that can protect patients and avoid damage
caused by the inappropriate use of this data. The research is justified by the need to
identify possible theoretical foundations that can enable reflection and ethical and
normative construction to protect patients' sensitive data, considering that the leakage
of this data can have a negative impact on people's private sphere, with various
violations of rights. In development, the work adopts as a theoretical framework a vision
of principles based on Human Rights, present in UNESCO's Universal Declaration on
Bioethics and Human Rights, overcoming the utilitarian approach reported in the
traditional principles of the Belmont Report. In methodological terms, theoretical
research follows the inductive method, through which, starting from the theoretical
assumptions mentioned, the aim is to obtain conclusions whose content is capable of
contributing to the solution of the problem presented. Regarding data collection
strategies and procedures, the research uses bibliographical research in addition to
the collection and analysis of legislation. Through the question raised, together with
the analysis of relevant institutes and legal figures, the search for agreements within
scientific principles capable of contributing to a more comprehensive ethical and
normative reflection, guaranteeing the protection of sensitive personal data in
telemedicine
Oxidation of thioanisole using niobium-silica catalysts : theoretical and experimental studies.
No full textCatalysts containing supported metal oxides are very versatile materials used in liquid phase oxidation reactions. The present
study aimed to determine the infuence of niobium supported on a silica matrix (SiO2) for the oxidation of thioanisole to
methyl phenyl sulfoxide and methyl phenyl sulfone. Characterization of the synthesized Nb5SiO2 and Nb10SiO2 catalysts
revealed that although they are not completely crystalline, these microporous materials displayed even niobium dispersion
on the SiO2 support whilst containing Lewis and Brönsted acidic sites on their surface. Nb5SiO2 and Nb10SiO2 catalysts
showed higher activities compared to pure SiO2 catalyst. Niobium-containing catalysts promoted the subsequent oxidation
reaction that converted methyl phenyl sulfoxide to methyl phenyl sulfone. The formation of methyl phenyl sulfone was
observed in the presence of niobium-containing catalysts even when using a defciency of H2O2 (0.44 equivalents), whereas
the same result could not be achieved for the SiO2 catalyst. The formation of methyl phenyl sulfone occurred in a signifcantly
shorter time in the presence of Nb10SiO2, demonstrating the efectiveness of niobium in producing active oxygen species
that promote the subsequent reactions. Under the optimized conditions, methyl phenyl sulfoxide could be obtained with
100% conversion and selectivity at room temperature (25 °C) in either acetonitrile or methanol as solvent. Finally, theoreti-
cal calculations showed, through energy values, that the niobium-containing catalysts have a lower relative surface energy
compared to the pure silica catalyst. The results presented in this research show the potential of the synthesized materials to
promote thioanisole catalytic oxidation reactions using hydrogen peroxide as an oxidant
Influência dos rejeitos de mineração e de siderurgia em compósitos cimentícios destinados à produção de pedras ornamentais artificiais.
No full textPrograma de Pós-Graduação em Engenharia Civil. Departamento de Engenharia Civil, Escola de Minas, Universidade Federal de Ouro Preto.Os rejeitos industriais têm despertado um interesse crescente no desenvolvimento e pesquisa de
novos materiais, especialmente diante dos impactos associados à extração de matérias-primas
minerais e à disposição de resíduos no meio ambiente. Nesse contexto, o presente estudo visa
investigar o efeito da utilização do Rejeito de Quartzito (RQ), Rejeito de Minério de Ferro
(RMF) e Escória de Aciaria (EA) em compósitos cimentícios destinados à produção de Pedras
Ornamentais Artificiais (POAs). Inicialmente, conduziu-se uma pesquisa bibliográfica por
meio de uma revisão sistemática abrangente sobre o emprego desses rejeitos em materiais
cimentícios para a construção civil. Além disso, realizou-se uma pesquisa experimental
envolvendo a caracterização dos rejeitos, estudo de dosagens e análise das propriedades físicas
e mecânicas dos compósitos cimentícios propostos para as POAs. A revisão bibliográfica
evidenciou o elevado potencial de utilização dos rejeitos em compósitos à base de cimento. No
geral, os rejeitos processados utilizados na produção dos compósitos são compostos por grãos
predominantemente finos e sub-arredondados. Além disso, o RQ contém uma alta concentração
de óxido de silício (94%), associada ao quartzo, enquanto o RMF é composto
predominantemente por óxido de ferro (71%) presente na hematita, goethita e magnetita, e a
EA por óxidos de cálcio (34%), ferro (31%) e silício (16%) nos silicatos dicálcicos, bem como
cal, wuestita e helvina. No estudo de dosagens, observou-se que as formulações com maiores
teores de RMF demandaram mais água para manter a consistência adequada da mistura, o que
afetou negativamente a coesão e resistência dos compósitos, além de aumentar sua porosidade.
Por outro lado, as compostas exclusivamente por RQ, in-natura e processado, como agregado
reciclado obtiveram resultados promissores para uso em POAs; assim como as compostas por
RQ e EA. Este fato está associado ao RQ ser um agregado com baixa absorção de água e à EA
atuar como aglomerante secundário e filler, refinando o sistema de poros. Essas conclusões
apoiam o uso dos rejeitos investigados como uma alternativa viável na produção de POAs,
alinhada aos princípios de preservação ambiental, e fornecem insights para pesquisas futuras.The growing interest in developing and researching new materials is driven by the impacts
associated with the extraction of mineral raw materials and the disposal of industrial waste in
the environment. This study investigates the use of Quartzite Tailings (QT), Iron Ore Tailings
(IOT), and Steel Slag (SS) in cementitious composites to produce Artificial Ornamental Stones
(AOS). Initially, a comprehensive systematic literature review was conducted on the use of
these tailings in cementitious materials for civil construction. Additionally, experimental
research was performed, including tailings characterization, dosage study, and analysis of the
physical and mechanical properties of the proposed cementitious composites for AOS. The
literature review highlighted the high potential for using these tailings in cement-based
composites. The processed tailings used in the composites are predominantly composed of fine
and sub-rounded grains. QT contains a high concentration of silicon oxide (94%), associated
with quartz, while IOT is predominantly composed of iron oxide (71%), present in hematite,
goethite, and magnetite. SS contains calcium oxides (34%), iron (31%), and silicon (16%) in
dicalcium silicates, as well as lime, wüstite, and helvin. In the dosage study, formulations with
higher IOT contents required more water to maintain proper mixture consistency, which
negatively affected the cohesion and strength of the composites and increased their porosity.
Conversely, composites made exclusively of QT, both in-natura and processed as recycled
aggregate, yielded promising results, as did those composed of QT and SS. This is attributed to
QT’s low water absorption and SS's role as a secondary binder and filler, refining the pore
system. These findings support using the investigated tailings as a viable alternative for AOS
production, aligned with environmental preservation principles, and provide insights for future
research
O uso do alfabeto manual como apropriação da língua portuguesa escrita por crianças surdas.
No full textPrograma de Pós-Graduação em Letras. Departamento de Letras, Instituto de Ciências Humanas e Sociais, Universidade Federal de Ouro Preto.O objetivo desta pesquisa, ancorada nos Estudos Surdos, foi verificar como o Alfabeto Manual
(AM) pode contribuir para a apropriação do aprendizado da Língua Portuguesa como segunda
língua, na modalidade escrita, por crianças surdas na fase inicial de escrita, anos iniciais do
ensino fundamental I, em escolas públicas inclusivas da Região dos Inconfidentes. A base
teórica do estudo foi formada por meio de pesquisas sobre surdez que favorecem os Estudos
Surdos no Brasil. Para o desenvolvimento do estudo, a metodologia utilizada foi a qualitativa
aplicada, e o trabalho de campo foi apoiado em uma pesquisa-ação, em que a interação direta
com o ambiente e os participantes foi fundamental para a coleta de dados. Por meio da
observação in loco, foi possível preparar e aplicar atividades relacionadas ao AM, que foram
alicerçadas ao conteúdo trabalhado em sala de aula. Essa prática permitiu maior imersão no
contexto educacional e facilitou a compreensão e a implementação de estratégias eficazes de
ensino. Para a coleta de dados foram feitas entrevistas semiestruturadas com professores
regentes de Língua Portuguesa, além de gravações em vídeo e anotações em diário de campo.
As atividades foram alinhadas com a Técnica de Encadeamento, e a imagem foi acrescentada
com base no letramento visual, ao qual nomeou-se de Técnica de Sequência Visual. Para as
análises, foi feita a triangulação dos dados, o que possibilitou contribuir para futuros estudos na
área da surdez. Constatou-se que o AM desempenha um papel significativo no aprendizado da
LínguaPortuguesa na modalidade escrita, e funciona como uma ferramenta basilar, relevante,
no contexto educacional, de modo contínuo.The objective of this research, grounded in Deaf Studies, was to investigate how the manual
alphabet (MA) can contribute to the acquisition of Portuguese as a second language in its written
form by deaf children in the early stages of writing, specifically during the initial years of
elementary education in inclusive public schools in Região dos Inconfidentes. The theoretical
foundation of this study was shaped by research on deafness that supports Deaf Studies in
Brazil. The methodology used for the development of this study was applied qualitative
research, supported by fieldwork and action research, where direct interaction with the
environment and the participants is fundamental for data collection. Through on-site
observation, it was possible to prepare and implement activities related to the MA, based on the
content addressed in classroom. This practice allowed greater immersion in the educational
context, facilitating the understanding and implementation of effective teaching strategies. Data
collection involved semi-structured interviews with Portuguese Language teachers, as well as
video recordings and a field diary. The activities were aligned with the Chaining Technique,
adding images based on visual literacy, which was namde “Visual Sequence Technique”. Data
analysis was performed using triangulation, which allowed for contributions to future studies in
the field of deafness. It was found that the Manual Alphabet plays a significant role in the
learning of written Portuguese, working as a foundational and relevant tool in the educational
context, in a continuous manner
The secret path : Benjamin, Brecht and the anti-tragic.
No full textNos seus dois principais ensaios sobre o teatro épico, Benjamin sugere que o elemento antitrágico do teatro brechtiano pode ser lido como umaespécie de herança da atitude socrática e do diálogo platônico, transmitidas de modo “secreto e sorrateiro” pelo drama de martírio, pela tragédia clássica francesa e pelo Trauerspiel.In his two main essays on epic theater, Benjamin suggests that the anti-tragic element of Brechtian theater can be read as a kind of heritage of the Socratic attitude and the Platonic dialogue, transmitted in a “secret and sneaky” way by martyr drama, French classical tragedy, and Trauerspiel
Dramaturgias negras del sur : asentamientos culturales y políticos de la escena amefricana en la Pampa.
No full textEste artigo apresenta as reflexões sobre dramaturgias negras produzidas no Pampa sul-americano, na segunda década do século XXI, a partir das obras Cavalo de Santo (Brasil), La Diosa y la noche: el musical de Rosa Luna (Uruguai) e No es país para negras II (Argentina), sob as perspectivas afrocêntricas. A abordagem considera a existência de um Pampa amefricano na perspectiva da antropóloga Lélia Gonzalez e busca analisar a dramaturgia que embasa a cena teatral a partir das categorias de ancestralidade, reexistência, agenciamento e luta antirracista, para compreender as características, abordagens e contribuições para o processo de reterritorialização da negritude no Sul.This study reflects on Black dramaturgies produced in the South American Pampas in the second decade of the 21st century, based on the works Cavalo de Santo (Brazil), La Diosa y la noche: el musical de Rosa Luna (Uruguay), and No es país para negras II (Argentina), from Afrocentric perspectives. The approach considers the existence of an Amefrican Pampa (according to the perspective of anthropologist Lélia Gonzalez) and seeks to analyze the dramaturgy that underpins the theatrical scene via the categories of ancestry, re-existence, agency, and anti-racist struggle to understand the characteristics, approaches, and contributions to the process of re-territorialization of Blackness in the South