Encontrados 24 documentos, a visualizar página 1 de 3
Environmental and endocrine assessment of sheep welfare in a climate-controlled...
Baptista, F.J.; Marques, R.; Castro, J.A.; Shahidian, S.; Fitas da Cruz, V.; Sales-Baptista, E.The nutritional status of sheep grazing in the Montado ecosystem varies considerably throughout the year, due to variations in the availability and quality of pastures, strongly influenced by the typical climatic conditions of the Mediterranean region: dry summer and autumn with very little rain. These variations lead to severely restricted feeding for approximately half the year, causing under-nutrition, limit...
A Rheological Model for Cupuassu (Theobroma grandiflorum) Pulp at Different Con...
Chaves, M.A.; Baptista, F.J.; Silva, J.N.; Rodrigues, L.; Viana, A.D.This work was made aiming at studying the best model for the rheological properties of Cupuassu (Theobroma grandiflorum, Schum) pulps with 14 (in nature), 17, 19, 23 and 25°Brix of total soluble solids (TSS) which were me asured at 20, 30, 40, 50 and 60°C temperature using a conc entric cylinder rheometer. The results were adjusted to the following nine models: Ostwald-de-Waele (power law), Bingham, Casson, Gen...
Effect of nocturnal ventilation on the occurrence of Botrytis cinerea in Medite...
Baptista, F.J.; Bailey, B.J.; Meneses, J.F.Botrytis cinerea is the causal agent of grey mould disease which is one of the most important diseases affecting tomato crops in unheated greenhouses. Nocturnal ventilation is a technique that can be used to reduce relative humidity inside unheated greenhouses. The main objectives of this research were to investigate the effect of ventilation management on the environmental conditions and on the disease severit...
Greenhouse Energy Consumption for Rose Production in Different Regions of Portu...
Baptista, F.J.; San Jose, E.; Guimaraes, A.C.; Navas, L.M.; Meneses, J.F.In this work results of an energy consumption study for rose production in multi-tunnel greenhouses, located in Porto (Pedras Rubras), Marinha Grande, Dois Portos, Zambujeira, Faro, Funchal and Ponta Delgada, are presented. The greenhouse considered with a surface area of about 1 ha had galvanised steel structure and was covered with three layer co-extruded plastic films. It was equipped with a hot water heatin...
Climate Modelling of a Greenhouse with Proportional Environmental Control
Louro, M.; Baptista, F.J.; Mourão, I.Performance of greenhouse environmental control systems can be evaluated by predictive climate models. In this work, a model for the prediction of environmental parameters such as temperature and humidity based on energy and mass balances, was developed and validated for a greenhouse controlled with a proportional environmental control system. The greenhouse is in Viveiros do Furadouro, a forestry nursery from ...
Greenhouse Energy Consumption for Tomato Production in the Iberian Peninsula Co...
Baptista, F.J.; Silva, A.T.; Navas, L.M.; Guimaraes, A.C.; Meneses, J.F.Greenhouse climate models are a powerful tool which allows the simulation of inside environmental conditions as a function of external conditions, construction and environmental control equipments characteristics. They also permit to evaluate the energy consumption necessary to obtain the predefined conditions. A theoretical study of the greenhouse energy requirements for all year round tomato production in Por...
POTENCIAL DE VÁRIAS TECNOLOGIAS PARA MELHORAR A EFICIÊNCIA ENERGÉTICA NA AGRICU...
Baptista, F.J.; Silva, L.L.; Sousa, A.; Silva, J.R.Este trabalho versa sobre o potencial de várias tecnologias para melhorar a eficiência energética na agricultura e consiste num resumo da apresentação feita em Quito, Equador no Primeiro Fórum Ibero-Americano de Ciências para as Energias, em Junho de 2012. Os dados estatísticos nos vários países, relativos ao consumo de energia pelo sector agro-pecuário não reflectem na maior parte dos casos a realidade, pecand...
Ventilação nocturna de estufas não aquecidas
Baptista, F.J.; Meneses, J.F.As estufas utilizadas nas zonas de clima Mediterrâneo são normalmente estruturas simples com cobertura de material plástico e cuja principal técnica de condicionamento ambiental é a ventilação natural. A Botrytis cinerea é o agente responsável pela podridão cinzenta, doença que origina elevados prejuízos nalgumas culturas em estufas não aquecidas. Na cultura do tomate, esta doença pode ser responsável por perda...
PHYSICOCHEMICAL PROPERTIES AND ACCEPTANCE OF JELLY AND NECTAR OF ARAZA AND PAPAYA
Chaves, M.A.; Soares, R.D.; Baptista, F.J.; Soares, E.C.; Pinto, E.G.; Sacramento, C.K.The main objective of this work was to evaluate the acceptance of jelly and nectars made from araza (Eugenia stipitata Mc Vaugh) and papaya. The following percentages of araza and papaya were, respectively, used: 50:50; 40:60; 30:70 and 20:80. For both pulps and products the variables studied were: acidity, pH, total content of soluble solids. Acceptance tests were conducted for the developed products. An inver...
Software for the calculation and modeling of effective diffusivity during osmot...
Chaves, M.A.; Baptista, F.J.This paper concerns a comprehensive and graphic computer program for the calculation of effective diffusivities and Fick’s Law model adjustment. The program was designed to be applicable to situations in which solid materials, with a specific geometry (cubes, infinite planes, spheres, infinite cylinders) and a given initial concentration are immersed in a solution with high and constant concentration. Shrinkage...
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