Institution
Universidade Federal de Viçosa
Education•Viçosa, Brazil•
About: Universidade Federal de Viçosa is a education organization based out in Viçosa, Brazil. It is known for research contribution in the topics: Population & Biology. The organization has 16012 authors who have published 26711 publications receiving 353416 citations.
Topics: Population, Biology, Soil water, Dry matter, Species richness
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a detailed review on the topics involving the mathematical modeling and design of the main structures and strategies for damping in a grid-connected three-phase PV system based on LCL filter is presented.
Abstract: Distributed generation systems have been expanded considerably in recent years. These systems are generally based on power electronics converters, whose switching harmonics need to be reduced by means of passive filters. LCL filter is a solution that has been strongly employed. However, LCL filter presents a resonant frequency that needs to be damped. This work presents a detailed review on the topics involving the mathematical modeling and design of the main structures and strategies for damping in a grid-connected three-phase PV system based on LCL filter. Four techniques are analyzed: Series passive damping (SPD), capacitor current feedback based strategy (CCF), capacitor voltage feedback based strategy (CVF) and notch filter based method (NF). This study analyzes low frequency models, control design and operation in weak grid conditions. Finally, transfer functions of the harmonic rejection capability of each damping strategy are illustrated. This work finishes with a case study of a 10 kW inverter, which evaluates all issues previously approached.
85 citations
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TL;DR: In conclusion, distinct neural processes are engendered by different practice conditions and the integration of behavioral and neurophysiological findings promotes a more comprehensive view of the phenomenon.
85 citations
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TL;DR: A garantia ofensiva de seguranca alimentar e nutricional exige programas that contemplem tanto o combate a desnutricao quanto ao sobrepeso e a obesidade.
Abstract: OBJETIVO: Revisar criticamente os estudos que avaliaram os impactos do Programa Bolsa Familia (PBF) na promocao da seguranca alimentar e nutricional no Brasil. METODOS: Foram consultadas as bases de dados Biblioteca Cochrane, LILACS, Medline e SciELO, bem como os portais de organizacoes publicas. Foram selecionados os estudos que utilizaram dados primarios e excluidos estudos baseados em dados secundarios, artigos de revisao, estudos que nao permitiram estabelecer uma associacao entre PBF e seguranca alimentar e nutricional, bem como os estudos que avaliaram a seguranca do alimento no que se refere apenas a qualidade sanitaria. RESULTADOS Foram selecionados 10 estudos, dos quais cinco concluiram que o PBF teve um impacto positivo na seguranca alimentar e nutricional das familias beneficiarias. Entretanto, tres estudos constataram um aumento do consumo de alimentos de maior densidade calorica e baixo valor nutritivo. Essa mudanca no habito alimentar e um fator de risco para o desenvolvimento do sobrepeso, obesidade e das doencas cronicas nao transmissiveis. CONCLUSOES: A garantia de seguranca alimentar e nutricional exige programas que contemplem tanto o combate a desnutricao quanto ao sobrepeso e a obesidade. Programas de distribuicao de renda, como o PBF, podem contribuir mais efetivamente para o bem-estar nutricional dos beneficiarios quando combinados com outros tipos de intervencoes, como acoes de promocao de alimentacao saudavel.
84 citations
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TL;DR: This paper investigated local and landscape-scale responses of Amazonian avian assemblages to land-cover changes across a gradient of land-use intensity ranging from undisturbed primary forest to mechanised agriculture in 36 drainage catchments distributed across two large regions of the eastern Brazilian Amazon.
84 citations
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TL;DR: In this paper, the authors developed and characterized biodegradable nanospheres containing essential oils from Zanthoxylum rhoifolium leaves and evaluated its insecticidal effect in Bemisia tabaci populations.
84 citations
Authors
Showing all 16194 results
Name | H-index | Papers | Citations |
---|---|---|---|
José A. Teixeira | 101 | 1414 | 47329 |
J. Alfredo Martínez | 82 | 642 | 24009 |
Andrew J. Davison | 78 | 240 | 22171 |
David H. Bromwich | 75 | 291 | 21688 |
Takeji Nishikawa | 59 | 408 | 14727 |
Thierry Candresse | 59 | 403 | 11833 |
Raul Narciso C. Guedes | 55 | 378 | 10668 |
Matthias Erb | 54 | 166 | 8599 |
Arne Janssen | 53 | 179 | 8315 |
Paulo R. Guimarães | 52 | 162 | 10206 |
Antonio Reverter | 52 | 233 | 7259 |
Adriano Nunes-Nesi | 52 | 157 | 8453 |
Fermín I. Milagro | 51 | 245 | 9281 |
Svetoslav Dimitrov Todorov | 51 | 210 | 7072 |
Marcos Heil Costa | 50 | 124 | 9660 |