ABSTRACT:The knowledge of the evapotranspiration (ETc) and crop coefficient (Kc) is fundamental to plan and to manage the irrigation of any crop. The aim of this study was to determine the daily and hourly evapotranspiration of drip irrigated watermelon (Citrullus Lanatus, var. Crimson Sweet)
A cultura do maracujazeiro-amarelo tem tido grande expansão da área cultivada no Estado de São Paulo e, apesar da importância da irrigação para a cultura, há poucos estudos sobre sua utilização. Este trabalho foi realizado na área experimental de irrigação, na Fazenda Areão, do Departamento de Engenharia Rural, da Escola Superior de Agricultura "Luiz de Queiroz" - ESALQ/USP (Piracicaba - SP). Foram coletados dados de saldo de radiação, fluxo de calor no solo, gradientes de temperatura e pressão de vapor do ar com o objetivo de avaliar a partição da energia disponível e a evapotranspiração em cultivo de maracujazeiros em dois sistemas de plantio (linhas de cultivo norte-sul e leste-oeste). O método da razão de Bowen foi utilizado na determinação dos fluxos de calor sensível e latente. O saldo de radiação não foi influenciado pelo sistema de plantio, sendo equivalente a 60% da radiação global. O componente de maior contribuição no balanço de energia foi o calor latente de evaporação ocorrendo imediatamente após a chuva ou irrigação. A utilização do modelo de análise e exclusão de intervalos em que o método da Razão de Bowen falha, melhora a estimativa da evapotranspiração.
Abstract.Internet has become an increasingly constant presence everywhere that people go. Particularly this reality is visible in social networks and selling portals scenarios. Whatever scenario, there is plenty of space to improve accuracy since big data is a problem when scale increases. Semantic search is an alternative to improve search accuracy by understanding the contextual meaning of terms as they appear in the searchable data space. Among the several approaches to Semantic Search methodologies, a variation of Ontologybased search (or Logic Approach) is the one adopted. In this methodology, the engine not only understands hierarchical relationships of entities, however also more complex inter-entities relationships defined inside ontologies. This paper proposes a hybrid approach for the problem using Ontology-based Recommender Systems and semantic profiles. A portal prototype is designed and implemented for the domain of online dealership's vehicle buyer's market. Precision and Recall measures are the two major indices of information retrieval. They have been used to evaluate the prototype results. After calculating these two metrics over some searches, we have seen that Precision is 86.66% and Recall is 68.42%. These final results have demonstrated an improvement in the searches, particularly with regard the precision of the results provided to the users.
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