Geoquímica das faixas máficas-ultramáficas, plutonitos e migmatitos do greenstone belt Barbacena, na região de Conselheiro Lafaiete (MG)

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COMPETÊNCIAS NA BNCC

A educação básica brasileira encontra-se em mudança, em particular pela implementação da Base Nacional Comum Curricular (BNCC), um documento orientador ao professor e aos sistemas de ensino. Entretanto, os livros didáticos (LD) recomendados pelo Programa Nacional do Livro e Material Didático (PNLD) por serem anteriores à BNCC não refletem em sua totalidade as orientações. Nessa perspectiva, visando auxiliar o professor na elaboração de tarefas capazes de promover o desenvolvimento das competências e habilidades preconizadas pela Base, foi analisado o volume 2 da coleção Conexões com a Física, recomendado pelo PNLD 2018, que interpela no discorrer do livro o desenvolvimento das competências e habilidades da área de Física. Verificou-se que o LD não potencializa o desenvolvimento de certas competências e habilidades da BNCC. Para suprir tal lacuna foi elaborado um material complementar de Física, constituído de um estudo dirigido sobre aquecedores solares, estruturado em três etapas de objetivos (síncrese, análise e síntese). O material foi aplicado em uma escola estadual de Belo Horizonte e os resultados obtidos apontam que as competências analisadas no LD foram potencializadas em no mínimo 80%, auxiliando os estudantes na construção do conhecimento científico, em um eficaz processo ensino-aprendizagem e na associação dos conceitos de Física

Avaliação do risco mediante modelos GARCH e simulação Montecarlo: evidência do mercado acionista colombiano

This paper evaluates the performance of several volatility models for estimating one-day-ahead Value-at-Risk (VaR) of twenty-four stocks return series in Colombia, using a number of distributional assumptions. Because all return series exhibit volatility clustering and long-range memory, GARCH-type models including models under normal, T-Student and generalized error distribution are examined. The findings corroborate the difficulty of choosing a single model for calculating VaR, but validate the use of parametric models with normal distribution and Montecarlo simulation in emerging financial markets.Este documento evalúa el comportamiento de varios modelos de volatilidad en estimaciones de un día del valor en riesgo (VaR) de veinticuatro series de retornos de acciones en Colombia con diferentes distribuciones. Al considerar que todas las series de retornos presentan clúster de volatilidad y memoria de largo plazo, se utilizan modelos tipo GARCH que incluyen diferentes distribuciones: normal, T-Student y GED. Los hallazgos corroboran la dificultad de elegir un único modelo para el cálculo del VaR, pero validan el uso de modelos paramétricos con distribución normal y simulación Montecarlo en mercados financieros emergentes.Este documento avalia o comportamento de vários modelos de volatilidade em estimativas de um dia do Value at Risk (VaR) de 24 séries de retornos das ações na Colômbia com diferentes distribuições. Ao considerar que todas as séries de retornos apresentam cluster de volatilidade e memória de longo prazo, são utilizados modelos tipo GARCH que incluem diferentes distribuições: normal, t-student e GED. Os achados corroboram a dificuldade de escolher um único modelo para calcular o VaR, mas validam o uso de modelos paramétricos com distribuição normal e simulação Montecarlo em mercados financeiros emergentes

How pre- and postcopulatory sexual selection influence male mating decisions in a promiscuous species

This work was supported by Portuguese National Funds through FCT (Fundação para a Ciência e a Tecnologia), within the cE3c Unit FCT funding (grant number UID/BIA/00329/2013), IO PhD grant (grant number SFRH/BD/90686/2012) and SAMV and MB Post-Doctoral research grants (grant numbers SFRH/BPD/66042/2009 and SFRH/BPD/82259/2011, respectively). This work was also supported by ERC (European Research Council) BioTIME (grant number 250189).When females mate multiply, male reproductive success depends on both pre- and postcopulatory processes, including female choice and sperm competition. However, these processes can favour different mating tactics in males. Here we used the Trinidadian guppy, Poecilia reticulata, system to understand how this conflict is resolved. We asked whether knowledge of recent female mating history leads males to adjust their mating effort with respect to the time devoted to mating activity, and the frequency and the sequence of mating tactics employed. To do this we quantified male mating behaviour in three competitive scenarios: (1) Single, when a focal male arrives near a single female and remains alone with her; (2) First, when a focal male is joined by a rival male; and (3) Second, when a focal male arrives after a rival male. We hypothesized that males adjust their behaviour based on arrival order. If female sequential mate choice is the main process shaping male mating behaviours (favouring First males in guppies), males should avoid competition and invest most when Single. Alternatively, if last- male sperm precedence is the major driver of decision making, males should invest more in mating attempts in the Second scenario. Greatest investment when First implies an intermediate strategy. We found that order of arrival influenced mating decisions with most mating activity during the First rather than the Single and Second scenarios. This result suggests that both pre- and postcopulatory processes influence mating investment, and that individual males make contingent decisions to maximize both mating and fertilization success.PostprintPeer reviewe

Atividade física na prevenção de diabetes em etnia negra: quanto é necessário?

OBJETIVO: Analisar a quantidade (intensidade e duração) de atividade física total e em seus diferentes domínios (trabalho, deslocamento, atividade doméstica e tempo livre) como preditores da ausência de diabetes em população de etnia negra. MÉTODOS: Estudo transversal com amostra de 2305 adultos negros de 20 anos a 96 anos de idade, sendo 902 (39,1%) homens, residentes na cidade de Salvador, Bahia, Brasil. Foram construídas curvas Receiver Operating Characteristic (ROC) e comparadas às áreas entre a quantidade de atividade física em seus diferentes domínios e a ausência de diabetes. Verificou-se também a sensibilidade e especificidade para identificar os melhores pontos de corte da quantidade de atividade física para a ausência de diabetes. Com base nestes pontos de corte, construiu-se modelo multivariado para identificar associação entre atividade física e diabetes. RESULTADOS: Entre as diferentes quantidades de atividade física encontrou-se maior significância estatística nas áreas sob a curva ROC na atividade física total, nas atividades moderadas realizados no tempo livre e no trabalho entre os homens, e no deslocamento entre as mulheres. A caminhada isoladamente não foi bom preditor da ausência de diabetes entre homens. Observou-se também que 185 minutos/semana de atividade física acumulada nos diferentes domínios para homens e 215 minutos/semana para mulheres foram os melhores pontos de corte para predizer a ausência de diabetes, porém após análise multivariada encontrou-se associação entre atividade física e diabetes apenas entre os homens. CONCLUSÃO: A atividade física acumulada nos diferentes domínios deve ser sugerida em quantidades adequadas para a população de etnia negra visando contribuir para a prevenção do diabetes.OBJECTIVE: Analyze how much total physical activity (intensity and duration) is required and its different domains (work, commuting, household, and leisure time) as predictors of absence of diabetes in the black ethnicity population. METHODS: The design was cross-sectional with a sample of 2305 adults from 20 to 96 years of age, 902 (39.1%) male, living in the city of Salvador, Brazil. Receiver Operating Characteristic curves (ROC) were constructed to compare the areas of amount of physical activity in their different domains with absence of diabetes. Sensitivity and specificity were also established to identify the best cutoffs for the amount of physical activity related to absence of diabetes. Based on these cutoff points, a multivariate model was constructed to identify the association between physical activity and diabetes. RESULTS: Among the different amounts of physical activity greater significance was found in areas under the ROC curve for total physical activity, moderate activities performed during leisure time and work among men and commuting among women. Walking by itself was not a good predictor of absence of diabetes among men. It was also observed that 185 minutes/week of physical activity accumulated in different domains for men and 215 minutes/week for women were the best cutoffs for predicting absence of diabetes. CONCLUSION: Physical activity accumulated in different domains should be suggested in amounts suitable for a black ethnicity population in order to contribute to diabetes prevention

An assessment of dedicated energy crops in Europe under the EU Energy Reference Scenario 2013. Application of the LUISA modelling platform - Updated Configuration 2014

This report presents a comprehensive analysis of dedicated energy crops (ENCR) performed with the LUISA (Land Use-based Integrated Sustainability Assessment) modelling platform across Europe between 2020 and 2050. LUISA is configured in compliance with the “EU Energy, Transport and GHG emissions trends until 2050” document in order to ensure that the EU meet its climate and energy targets up to 2050 (EU Reference Scenario 2013, updated LUISA configuration 2014). The spatial modelling of ENCR in LUISA requires determining a set of elements such as the land demand, availability and suitability of the land, and other land categories for the ENCR cultivation. Thus, the assessment is focused on the following steps: 1) Land accounts and dominant land use/cover flows for the expansion of energy crops at European scale, 2) A suitability analysis of the land dedicated to these crops based on suitability maps, 3) Recuperation of degraded and contaminated lands for energy purpose, 4) A detailed regional analysis per each Member State (factsheets) with a summary of the main important findings, and 5) Evaluation of energy crops’ impacts on a selection of environmental indicators (provision of ecosystem services). In LUISA, the displacement and cultivation of crops solely dedicated to energy production takes place on a specific land-use class named ‘energy crop’ (ENCR), which competes in particular with the demand for others land-uses, such as for food, feed and forest. The amount of ENCR reaches about 13,549 kha in 2050 that represents, on average, 3.6% of Europe’s total available land. This expansion occurs mainly at expenses of land for food and feed (90%). Forest and natural land (9% and 1%,) represent respectively the second and third land flows towards ENCR among total land-use changes (with these flows represented respectively 9 and 1% of all land use changes). As result of this land competition, there is an increasing shift of food and feed crops towards low quality land, due not only to the ENCR expansion but also to the growth of residential and economic-driven land uses. It should also be noted that intensive agriculture practices for ENCR production might have some negative impacts on soil, water, biodiversity, amongst others. Owing to this potential impacts, the analysis performed on the supply of a set of ecosystem services identifies some services more sensitive than others to ENCR growth. In particular, pollination potential, habitat quality for birds and also the Green-Infrastructure network are expected to decrease due to ENCR growth, while patterns for recreational opportunities and water retention services are less evident.JRC.H.8-Sustainability Assessmen

Diagnostic financier et performance à l’exportation des MPMEs colombiennes.

This research focus on export performance and financial constraints that Colombian Micro, Small and Medium (MSMEs) enterprises face in international markets. A specific group of firms were interviewed and statistical techniques were applied. Results indicate that the Main problems that firms face are low innovation levels, the use of backward technology, low human capital and inadequate management practices.Esta investigación se centra en el desempeño de las exportaciones y las limitaciones financieras que enfrentan las micro, pequeñas y medianas empresas (MiPyMEs) colombianas en los mercados internacionales. Se entrevistó a un grupo específico de empresas y se aplicaron técnicas estadísticas. Los resultados indican que los principales problemas que enfrentan las empresas son los bajos niveles de innovación, el uso de tecnología atrasada, el bajo capital humano y las prácticas de gestión.Cette recherche porte sur les performances à l’exportation et les contraintes financières auxquelles sont confrontées les micros, petites et moyennes entreprises colombiennes (MPMEs) sur les marchés internationaux. Un groupe spécifique d’entreprises a été interrogé et des techniques statistiques ont été appliquées. Les résultats indiquent que les principaux problèmes rencontrés par les entreprises sont les faibles niveaux d’innovation, l’utilisation de technologies rétrogrades, le faible capital humain et les pratiques de gestion

PESQUISA LINGUÍSTICA NA AMAZÔNIA BRASILEIRA:

The recently created Working Group entitled "Linguistic Studies in the Brazilian Amazon" (GT ELIAB) was presented to the National Association of Graduate Programs and Research in Letters and Linguistics - ANPOLL and obtained approval from the Council of Linguistic Studies in May 2018 during the XXXIII ENANPOLL (Cuiabá, Mato Grosso, Brazil). The aim of this Working Group (WG) is to involve the Linguistic Programs located in the Brazilian Amazon to show that in this Amazonian space there is already a significant scientific production that aspires to be implemented with new results and productions. Among the results that the WG intends to achieve, we highlight the sharing and dissemination of the scientific production developed here, with the purpose of cooperating with the national research in the area and for those interested in linguistic studies carried out in the Amazon scenario.O recém-criado Grupo de Trabalho intitulado “Estudos Linguísticos na Amazônia Brasileira” (GT ELIAB) foi apresentado à Associação Nacional de Programas de Pós-graduação e Pesquisa em Letras e Linguística – ANPOLL e obteve aprovação do Conselho de Estudos Linguísticos em maio de 2018 durante o XXXIII ENANPOLL (Cuiabá, Mato Grosso, Brasil). O objetivo deste GT é envolver os Programas da área de Linguística localizados na Amazônia brasileira para mostrar que neste espaço amazônico já há uma significativa produção científica que aspira ser implementada com novos resultados e produções. Dentre os resultados que o GT pretende alcançar, destacam-se compartilhar e divulgar a produção científica desenvolvida aqui, com o propósito de cooperar com a pesquisa nacional na área ao mesmo tempo em que disponibiliza resultados de investigações aos interessados nos estudos linguísticos realizados no cenário amazônico

PERFORMANCE MEASUREMENT IN A BRAZILIAN CLINICAL TRIALS UNIT

Background: There is growing interest on costs of clinical trials; critical topic for business decision making; therefore, the aim of this work is to identify how a successful Brazilian case measures its economic performance even with restriction regarding its accounting data.  Methods: Single case qualitative method.  Interviews with four people of different hierarchical levels and the analysis of the 2005 balance sheet, payrolls and payment slips were carried out.Results: Besides indicating how the clinical research unit of the case measures its results, a diagram of how other units and organizations could follow such procedure to carry out their own performance measurement was pointed out as well.Conclusion: The use of contribution margin and break-even point for the performance calculation benefited the managerial decision-making of the unit studied,  serving as basis for its own strategy and use of its idleness. This is a reference model for decision-making of managers in other research units

PERFORMANCE MEASUREMENT IN A BRAZILIAN CLINICAL TRIALS UNIT

Background: There is growing interest on costs of clinical trials; critical topic for business decision making; therefore, the aim of this work is to identify how a successful Brazilian case measures its economic performance even with restriction regarding its accounting data.  Methods: Single case qualitative method.  Interviews with four people of different hierarchical levels and the analysis of the 2005 balance sheet, payrolls and payment slips were carried out.Results: Besides indicating how the clinical research unit of the case measures its results, a diagram of how other units and organizations could follow such procedure to carry out their own performance measurement was pointed out as well.Conclusion: The use of contribution margin and break-even point for the performance calculation benefited the managerial decision-making of the unit studied,  serving as basis for its own strategy and use of its idleness. This is a reference model for decision-making of managers in other research units