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Aprendendo com Ryuko Kubota : linguística aplicada, raça, identidade e abordagens críticas.
No full textSince the 1990s Ryuko Kubota has extensively researched race, identity, and critical approa-
ches to teacher development in the area of Applied Linguistics (AL). More recently, her last publications
include the relevance of translanguaging and ongoing work with the Sister Scholars. As the result of our
interest in Kubota’s extremely significant discussions, in this interview, Kubota points out the challenges
AL has faced in the last years, as well as the complexities of working in the Global North. Besides, she pro-
vides compelling insights in antiracist pedagogy and the role of Freire in English language teaching.Desde os anos 1990, Ryuko Kubota tem pesquisado temas relacionados à raça, identidade
e abordagens críticas de formação de professores na área de Linguística Aplicada (LA). Recentemente,
sua produção inclui a relevância da translinguagem e seu trabalho contínuo com as Sister Scholars. Nesta
entrevista, fruto do nosso interesse nas discussões propostas pela pesquisadora, Kubota discute os desafios
que a LA tem enfrentado nos últimos anos, bem como as complexidades de se trabalhar no Norte Global.
Ademais, a estudiosa fornece contribuições valiosas sobre uma pedagogia antirracista e o papel do educa-
dor Paulo Freire no ensino de língua inglesa
Interchangeable biomass fuels for paper-based microfluidic fuel cells : finding their power density limits.
No full textPaper batteries are self-pumping emerging tools for powering
portable analytical systems. These disposable energy converters must be low-cost
and must achieve enough energy to power electronic devices. The challenge is
reaching high energy while keeping the low cost. Here, for the first time, we report a
paper-based microfluidic fuel cell (PμFC) equipped with Pt/C on a carbon paper
(CP) anode and a metal-free CP cathode fed by biomass-derived fuels to deliver
high power. The cells were engineered in a mixed-media configuration, where
methanol, ethanol, ethylene glycol, or glycerol is electro-oxidized in an alkaline
medium, while Na2S2O8 is reduced in an acidic medium. This strategy allows for
optimizing each half-cell reaction independently. The colaminar channel of the
cellulose paper was chemically investigated by mapping the composition, which
reveals a majority of elements from the catholyte and anolyte on each respective
side and a mixture of both at the interface, assuring the existing colaminar system. Moreover, the colaminar flow was studied by
investigating the flow rate by considering recorded videos for the first time. All PμFCs show 150−200 s to build a stable colaminar
flow, which matches the time to reach a stable open circuit voltage. The flow rate is similar for different concentrations of methanol
and ethanol, but it decreases with the increase in ethylene glycol and glycerol concentrations, suggesting a longer residence time for
the reactants. The cells perform differently for the different concentrations, and their limiting power densities are composed of a
balance among anode poisoning, residence time, and viscosity of the liquids. The sustainable PμFCs can be interchangeably fed by
the four biomass-derived fuels to deliver ∼2.2−3.9 mW cm−2
. This allows choosing the proper fuel due to their availability. The
unprecedented PμFC fed by ethylene glycol delivered 6.76 mW cm−2
, which is the benchmark output power for a paper battery fed
by alcohol
Effects of minimally and ultra-processed foods on blood pressure in Brazilian adults : a two-year follow up of the CUME project.
No full textAim: To assess the association of food consumption
according to degree of processing with changes in systolic
(SBP) and diastolic (DBP) blood pressure in adult
participants of a Brazilian cohort.
Methods: Longitudinal study with 2496 adult participants
of the Cohort of Universities of Minas Gerais (CUME
Project). Food consumption was categorized by food
groups according to degree of processing following the
NOVA grading system: unprocessed/minimally processed
foods/culinary ingredients (U/MPF&CI), processed foods
(PFs) and ultra-processed foods (UPFs). unprocessed/
minimally processed foods/culinary ingredients (U/MPF&CI),
processed foods (PFs) and ultra-processed foods (UPFs).
Changes in SBP and DBP were categorized (decreased,
maintained, increased). Independent associations between
exposure and outcomes were verified using multiple
generalized ordered logistic models adjusted for potential
confounders.
Results: After a two-year follow-up, the consumption of
U/MPF&CI (% daily caloric intake) reduced the chance of
increasing DBP (P for trend ¼ 0.014), with a more evident
effect among participants within the 5th quintile of this
food group (odds ratio (OR) ¼ 0.55; 95% confidence
interval (CI): 0.34–0.97]. On the other hand, the
consumption of UPFs (% daily caloric intake) raised the
chance of increasing DBP (P for trend ¼ 0.005) and was
more evident among participants within the quintiles of
higher consumption (4th quintile – OR ¼ 1.97; 95% CI:
1.25–3.10; 5th quintile – OR ¼ 1.79; 95% CI ¼ 1.12–
2.86). No associations were found between food
consumption according to degree of processing and
changes in SBP.
Conclusion: Higher consumption of U/MPF&CI and UPFs
were independently associated to lower and greater
chances of increased DBP in adult participants from CUME
Project
Generalized torsion elements in groups.
No full textA group element is called a generalized torsion element if a
finite product of its conjugates is equal to the identity. We prove that in
a nilpotent or FC-group, the generalized torsion elements are all torsion
elements. Moreover, we compute the generalized order of an element in a
finite group G using its character table
Exploring DNA-interaction and molecular structure of ruthenium/1,2-bis-(diphenylphosphino)ethane)-based complex.
No full textThe mixture of cis and trans-[RuCl2(dppe)2] (dppe: 1,2-bis-(diphenylphosphino)ethane) was
prepared and the interaction with CT-DNA was evaluated by several methods, including UVvis DNA spectroscopic titration, viscosity, and electrochemical studies. Investigation
suggests that [RuCl2(dppe)2] interacts moderately with CT-DNA. Interestingly, the cis- and
trans-isomers interact differently with DNA, as proved by the square-wave voltammetry
studies. Finally, the crystal structure of trans-[RuCl2(dppe)2]Cl was obtained from an
electrochemical solution and studied in detail, which presents a distorted octahedral
geometry and interatomic parameters different from those found in the trans-
[RuCl2(dppe)2] complex. Crystal data for C52H48Cl4P4Ru: triclinic, space group P-1 (no. 2), a =
9.240(3) Å, b = 10.9290(18) Å, c = 11.993(3) Å, α = 78.707(11)°, β = 86.712(13)°, γ = 82.598(13)°,
V = 1177.1(5) Å3, Z = 1, T = 293(2) K, μ(MoKα) = 0.732 mm-1, Dcalc = 1.467 g/cm3, 8434
reflections measured (6.934° ≤ 2Θ ≤ 51.986°), 4607 unique (Rint = 0.0973, Rsigma = 0.1171)
which were used in all calculations. The final R1 was 0.0537 (I > 2σ(I)) and wR2 was 0.1347
(all data)
Sedimentary evolution and sequence stratigraphy of Ediacaran high-grade phosphorite-dolomite-shale successions of the Bocaina Formation (Corumba Group), Central Brazil : implications for the Neoproterozoic phosphogenic event.
No full textExtensive phosphorite deposition is observed in the Neoproterozoic after a prolonged hiatus during most of the Mesoproterozoic era. This event is thought to represent an important record of major palaeoenvironmental, palaeoceanographic and biotic changes that shaped Neoproterozoic ecosystems, suggesting close relationships between phosphogenesis and the preservation of key Ediacaran biotas. However, high-grade Ediacaran phosphorite deposits are relatively uncommon, diminishing the opportunity to test current phosphate mineralization–deposition models and their implications for Neoproterozoic research. In this scenario, widespread Ediacaran phosphorite–dolomite–shale successions of the Bocaina Formation (Corumba Group–Central Brazil) are poorly explored in international literature. Nevertheless, recent advances in phosphate exploration gave access to continuous drill core sections and freshly opened mine pits, revealing an unprecedented record of complex phosphatic successions featuring the occurrence of Ediacaran micro-fossils assigned to the Doushantuo–Pertatataka assemblages. This work seeks to constrain main lithofacies, sequence stratigraphy and depositional settings from these phosphatic successions in order to analyse the sedimentary evolution of the unit under the current Neoproterozoic phosphorite research frame-work. These results indicate that the Bocaina Formation records secular sustained phosphate deposition. These deposits are related to unprecedented, microbialite reef rim phosphorites deposited during a lower accretionary rimmed platform stage, followed by the deposition of Doushantuo-like, whole platform phosphorites associated with a later, drowned platform stage, there-fore, reinforcing the evidence for the operation of strong allogeneic controls on phosphate mineralization–concentration. In addition, this study concludes that fossiliferous Ediacaran phosphatic deposits such as the Bocaina Formation are important to understanding Neoproterozoic phosphogenic events, because they may record the transition from a Precambrian to Phanerozoic-like phosphogenesis associated with the instauration of the Ediacaran–Cambrian phosphatic taphonomic window. This evidence hints that the growing dataset from the Bocaina Formation may bring new, exciting perspectives for Neopro-terozoic research as a whole
Escravidão digital : caracterização jurídica do trabalho escravo contemporâneo nas relações de trabalho intermediadas por plataformas digitais.
No full textPrograma de Pós-Graduação em Direito. Departamento de Direito, Escola de Direito, Turismo e Museologia, Universidade Federal de Ouro Preto.Esta pesquisa analisa o conceito e a caracterização das formas de trabalho escravo
contemporâneo no contexto das novas configurações de trabalho desenvolvidas na era digital.
O objetivo central é, portanto, formular uma conceituação e determinar uma caracterização
jurídica do que o sociólogo Ricardo Antunes tem denominado como “escravidão digital”. O
objeto central da pesquisa são situações fáticas que podem ser juridicamente caracterizadas
como trabalho escravo nas relações de trabalho mediadas por plataformas digitais (trabalho
uberizado). O marco teórico eleito para confrontação da teoria sociológica é a conceituação e
a caracterização de trabalho escravo contemporâneo à luz do princípio da dignidade da pessoa
humana e seu corolário direito fundamental ao trabalho digno. A pesquisa se classifica, quanto
ao gênero, teórica, e os procedimentos utilizados envolvem, essencialmente, coleta e análise
de conteúdo doutrinário, normativo e jurisprudencial. Foi adotada como vertente teórico-
metodológica a jurídico-dogmática. A investigação tem caráter interdisciplinar na medida em
que pretende um diálogo direto com a Sociologia do Trabalho e, a partir dela, discursar sobre
os caracteres jurídicos que se identificam naquela construção. Além disso, inegáveis e diretas
as contribuições da Filosofia, da História e da Linguística (semântica) para a temática
proposta, respeitada a limitação da pesquisa. Ao final, é possível concluir pela possibilidade
de caracterização jurídica da “escravidão digital”, nas searas penal, civil-trabalhista e,
também, administrativa e tributária, a partir de uma interpretação evolutiva das normas que
vedam a escravidão em âmbito interno e internacional, em uma ampliação conceitual à luz do
Direito Fundamental ao Trabalho Digno, possibilitando a revelação de “novos” direitos a
“novos” sujeitos antes ocultados da proteção estatal.This research analyzes the concept and characterization of contemporary forms of slave labor
in the context of new work configurations developed in the digital age. The main objective is
to formulate a conceptualization and determine a legal characterization of what sociologist
Ricardo Antunes has called “digital slavery”. The object that is intended to be researched are
factual situations that can be legally characterized as slave labor in labor relations mediated
by digital platforms (uberized labor). The theoretical framework chosen to confront
sociological theory is the conceptualization and characterization of contemporary slave labor
in the light of the principle of human dignity and its corollary Fundamental Right to Decent
Work. The research is classified, in terms of genre, theoretical, and the procedures used
involved, essentially, the collection and analysis of doctrinal, normative and jurisprudential
content. The legal-dogmatic approach was adopted as a theoretical-methodological aspect.
The investigation has an interdisciplinary character insofar as it intends to establish a direct
dialogue with the Sociology of Work and, from there, discuss the legal characteristics that are
identified in that construction. In addition, the contributions of Philosophy, History and
Linguistics (semantics) to the proposed theme are undeniable and direct, respecting the
limitations of the research. In the end, it was possible to conclude for the possibility of legal
characterization of "digital slavery", in the criminal, civil-labor and administrative-tax fields,
based on an evolutionary interpretation of the norms that prohibit slavery in the internal and
international spheres, in an expansion concept in the light of the Fundamental Right to Decent
Work, enabling the revelation of “new” rights to “new” subjects of law previously hidden
from state protection
Lugar de pedagoga(o) não é somente na escola : trajetórias formativas e profissionais de pedagogas(os) que atuam em espaços de educação não escolar no estado de Minas Gerais.
No full textPrograma de Pós-Graduação em Educação. Departamento de Educação, Instituto de Ciências Humanas e Sociais, Universidade Federal de Ouro Preto.A atuação da(o) pedagoga(o) em espaços de educação não escolar (ENE) vem se constituindo
um campo de investigação em crescimento na área da educação. Esta constatação pode estar
relacionada com as atuais demandas de formação requeridas pela sociedade contemporânea e
com a Resolução CNE/CP no 01/2006 que estabeleceu as diretrizes para o curso de Pedagogia
e ressaltou a necessidade de o curso propiciar o conhecimento sobre os espaços não escolares.
A pesquisa que ora se apresenta buscou investigar como se constituiu a trajetória formativa e
profissional de pedagogas(os) que se inserem em espaços de ENE, especificamente, em espaços
de tratamento e promoção de saúde (hospitais, centros e demais unidades ligadas à área de
saúde), espaços de promoção da cultura (museus e demais equipamentos culturais) e espaços
de privação de liberdade (presídios, penitenciárias, centros socioeducativos etc.), no Estado de
Minas Gerais. Como objetivos específicos, a investigação se propôs a caracterizar o perfil
profissional das(os) pedagogas(os) que atuam em espaços de ENE no cenário mineiro;
compreender como se deu a formação no curso de Pedagogia a partir da percepção dos sujeitos;
identificar como ocorreu a inserção profissional das(os) pedagogas(os) nos espaços de ENE;
explicitar os fatores que interferem na atuação profissional das(os) pedagogas(os) nos espaços
de ENE. Trata-se de um estudo de abordagem qualitativa que adotou como procedimentos
técnicos a pesquisa bibliográfica, documental e de campo. Como instrumentos de coleta de
dados foram utilizados o questionário e a entrevista semiestruturada. Para tratar os dados
coletados recorreu-se à técnica de análise de conteúdo. Os dados produzidos sinalizaram que,
na percepção das pedagogas e do pedagogo entrevistados, as instituições de ensino superior
onde elas e ele concluíram a graduação ofertaram o curso de Pedagogia voltado para a educação
escolar, independente da época em que esse foi realizado. Os achados atestaram que a formação
para os espaços de ENE tem se demonstrado insuficiente ou não tem sido contemplada nos
cursos de Pedagogia, pois, privilegia-se a formação para a docência e o âmbito escolar. A razão
mais indicada pelas pedagogas e pelo pedagogo para ingressarem nos espaços de ENE é o
interesse em atuar fora do espaço escolar. Os fatores que interferem na atuação profissional das
pedagogas e do pedagogo se referem à articulação entre a área de educação e a área finalística
da instituição, à mobilização do conhecimento pedagógico e ao trabalho coletivo. As pedagogas
e o pedagogo realizam atividades intrinsecamente relacionadas com a educação do público-alvo
vinculado aos espaços investigados nesta pesquisa, sendo a organização do trabalho pedagógico
uma ação comum a todos os profissionais. A partir dos dados evidenciados e com base no
interesse que as pedagogas e o pedagogo manifestaram pelos espaços de ENE, afirma-se que a
formação para esses espaços é uma necessidade formativa. Defende-se que a formação da(o)
pedagoga(o) para os espaços de ENE deve ser contemplada de maneira sistemática no curso de
Pedagogia e que se deve conhecer com maior profundidade as peculiaridades da atuação para
cada um desses espaços com vistas a alcançar uma formação mais consistente.The role of the pedagogue in non-school education spaces has become a growing field of
investigation in the area of education. This finding may be related to the current training
demands required by contemporary society and with Resolution CNE/CP no 01/2006, which
established the guidelines for the Pedagogy course and highlighted the need for the course to
provide knowledge about non-school spaces. The research presented here sought to investigate
how the training and professional trajectory of pedagogues who work in non-school education
spaces, specifically, in treatment and health promotion spaces (hospitals, centers and other units
linked to the area of health), spaces for the promotion of culture (museums and other cultural
facilities) and spaces for deprivation of liberty (prisons, penitentiaries, socio-educational
centers), in the State of Minas Gerais. As specific objectives, the investigation proposed to
characterize the professional profile of the pedagogues who work in non-school education
spaces in the Minas Gerais scenario; understand how the training in the Pedagogy course took
place based on the subjects’ perception; identify how the professional insertion of pedagogues
in non-school education spaces occurred; explain the factors that interfere with the professional
performance of pedagogues in non-school education spaces. This is a qualitative study that
adopted bibliographic, documentary and field research as technical procedures. The
questionnaire and semi-structured interview were used as data collection instruments. To treat
the collected data, the content analysis technique was used. The data produced indicated that,
in the perception of the pedagogues and the pedagogue interviewed, the higher education
institutions where they and he completed their graduation offered the Pedagogy course aimed
at school education, regardless of the time in which it was carried out. The findings attested that
training for non-school education spaces has been shown to be insufficient or has not been
included in Pedagogy courses, as training for teaching and the school environment is prioritized.
The most common reason given by pedagogues and pedagogues for joining non-school
education spaces is the interest in working outside the school space. The factors that interfere
in the professional performance of pedagogues and pedagogues refer to the articulation between
the area of education and the final area of the institution, the mobilization of pedagogical
knowledge and collective work. Pedagogues and pedagogues carry out activities intrinsically
related to the education of the target audience linked to the spaces investigated in this research,
with the organization of pedagogical work being a common action for all professionals. Based
on the data evidenced and based on the interest that the pedagogues and the pedagogue
expressed in non-school education spaces, it is stated that training for these spaces is a training
necessity. It is argued that the training of pedagogues for non-school education spaces must be
systematically included in the Pedagogy course and that the peculiarities of performance in each
of these spaces must be known in greater depth with a view to achieving more consistent
training
Supporting decision-making process on higher education dropout by analyzing academic, socioeconomic, and equity factors through machine learning and survival analysis methods in the latin american context.
No full textThe prediction of university dropout is a complex problem, given the number and diversity of variables involved. Therefore, different strategies are applied to understand this educational phenomenon, although the most outstanding derive from the joint application of statistical approaches and computational techniques based on machine learning. Student Dropout Prediction (SDP) is a challenging problem that can be addressed following various strategies. On the one hand, machine learning approaches formulate it as a classification task whose objective is to compute the probability of belonging to a class based on a specific feature vector that will help us to predict who will drop out. Alternatively, survival analysis techniques are applied in a time-varying context to predict when abandonment will occur. This work considered analytical mechanisms for supporting the decision- making process on higher education dropout. We evaluated different computational methods from both approaches for predicting who and when the dropout occurs and sought those with the most- consistent results. Moreover, our research employed a longitudinal dataset including demographic, socioeconomic, and academic information from six academic departments of a Latin American university over thirteen years. Finally, this study carried out an in-depth analysis, discusses how such variables influence estimating the level of risk of dropping out, and questions whether it occurs at the same magnitude or not according to the academic department, gender, socioeconomic group, and other variables
