Lucas Viana

Federal University of Viçosa | UFV · Department of Agricultural Engineering

The increasing market interest in coffee beverage, lead coffee growers around the world to adopt more efficient methods to select the best-quality coffee beans. Currently, coffee beans selection is carried out either manually, which is a costly and unreliable process, or using electronic sorting machines, which are often inefficient because some co...

Nitrogen (N) plays a key role for optimal plant growth and, in particular, for profitable crop production. Optimal N management using optical sensors can provide a rapid assessment of a crop N status. Therefore, this study aimed at comparing the efficiency of two chlorophyll meters in assessing the N status in corn plants when using an economical o...

Spatial interpolation methods are frequently used to characterize soil attributes’ spatial variability. However, inconclusive results, about the comparative performance of these methods, have been reported in the literature. Therefore, the present study aimed to analyze the efficiency of ordinary kriging (OK) and inverse distance weighting (IDW) me...

The largest energy losses and voltage variations from electricity suppliers occur at times of peak demand. Daytime peaks are mainly influenced by large industrial and commercial consumers. The installation of photovoltaic systems without energy storage to supply part of the demand can contribute to stabilize the voltage and reduce losses. These and...

No Brasil, muitas famílias no meio rural não têm acesso à energia elétrica, o que dificulta terem melhor qualidade de vida e desenvolvimento na propriedade rural. O sistema fotovoltaico pode ser uma alternativa de conduzir energia a regiões rurais às quais a rede convencional, geralmente, não possui acesso. O objetivo deste trabalho foi avaliar o u...

The growing human population added to the rural exodus has aggravated the pressure in the agricultural sector for greater production. Faced with this problem, research has developed optical sensors for more productive agriculture with the purpose of minimizing the effects of rural exodus, obtaining rapid information and promoting the rational use o...

As equações empregadas para calcular o espaçamento entre drenos podem ser divididas em três grupos: as de regime permanente, as de regime não permanente e as de recarga intermitente. O dimensionamento deste espaçamento depende da obtenção de parâmetros físicos do solo e da adoção de critério de drenagem, o qual deve refletir a profundidade radicula...

As águas subterrâneas constituem um importante componente dos recursos hídricos, servindo como fonte de água para uso doméstico, industrial e para fins agrícolas. Recentemente, a atenção pública tem se virado para a contaminação dessas águas por meio de rejeitos industriais e atividades agrícolas, dentre outros. O fluxo de contaminantes nos sistema...

A máxima produtividade da lavoura é alcançada em condições ideais de cultivo. Em busca do ambiente ideal, se faz necessário o manejo e monitoramento constante da área cultivada, haja vista a possibilidade de ataque de pragas e doenças, além de estresse por falta de água e nutrientes. O monitoramento constante, se feito de forma manual é extremament...

Agricultural operations are generally carried out in places subject to abrupt environmental changes. In order to provide improvements in the work environment of tractor operators, it is of the utmost importance to monitor and make changes in the work environment. The present work aims to elaborate a low cost, flexible and easy to handle prototype,...

Public policies for energy efficiency have been deployed in several countries to reduce energy consumption and the emission of greenhouse gases. This work aims to analyze Brazilian public policies promoting energy efficiency, as well as related challenges and opportunities. It has been shown that governments must develop strategic energy planning,...