a b s t r a c tThe objective of the present study was to obtain and model drying curves of filmogenic solutions at the temperatures of 25, 30, 35, 40 and 45 C, consisting of different concentrations of starch and glycerol. The percentage of yam starch influenced the initial moisture content, while the critical moisture content varied as a function of the concentration of starch and temperature applied during drying of the filmogenic solutions. Glycerol concentration did not influence any of the parameters analyzed. Models for the two distinct phases (constant and decreasing drying periods) fit well for all drying temperatures and compositions, with average relative error values less than 10%. The interaction between starch content and temperature influenced the drying rate parameters during the constant period and the diffusion coefficients.

The objective of this paper was to model the drying curves of the leaves of basil (Ocimum basilicum L.) in the infrared at temperatures of 50, 60, 70 and 80 ºC and to evaluate the influence of drying temperature on the color of dried leaves. Drying was conducted in infrared dryer with temperature and greenhouse air circulation. Experimental data were fitted to eight mathematical models. The magnitude of the coefficient of determination (R²), the mean relative error (P), the estimated mean error (SE) and chisquare test (χ2) were used to verify the degree of fitness of the models. From the study it was concluded that: a) the behavior of the drying curves of basil leaves was similar to most agricultural products, the drying times in the infrared were less than the drying times in an oven with air circulation, b) the mathematical drying model proposed by Midilli et al. (2002) was the one which best adjusted to the experimental data, c) the diffusion coefficient ranged from 9.10 x 10-12 to 2.92 x 10-11 m² s-1 and d) the color of the samples was highly influenced by drying, becoming darker due to loss of chlorophyll with increasing temperature.

RESUMOObjetivou-se, neste trabalho, avaliar os efeitos do fluxo de ar sobre a queda da pressão estática em massa granular de quinoa, cultivar Real, com diferentes teores de impurezas; ajustar os modelos matemáticos aos dados experimentais obtidos e selecionar o modelo que melhor represente o fenômeno. Inicialmente, o produto estava isento de impurezas e com teor de água de 17% base seco. Foram feitas adições de impurezas nos percentuais de 1, 2, 3, 4 e 5. Utilizando-se um equipamento devidamente projetado e construído e fluxos de ar variando de 0,1 a 0,4 m 3 s -1 m -2 , foram determinadas as pressões estáticas da quinoa limpa e com impurezas. Os dados experimentais de perda de carga foram ajustados às equações comumente utilizadas para descrever o fenômeno. Os resultados permitiram concluir que: a) a pressão estática em uma coluna com grãos de quinoa aumenta com o incremento de fluxo de ar; b) O aumento do nível de impureza provocou redução da queda de pressão estática; c) As equações que melhor representam os dados experimentais da queda de pressão no interior do leito com grãos de quinoa, sem e com impurezas, foram as equações de Shedd e de Guimarães, respectivamente. Palavras-chave:Chenopodium quinoa Willdenow, fluxo de ar, impurezas, resistência ao fluxo de ar Loss of static pressure in a column of quinoa grains ABSTRACT The aim of this study was to evaluate the effects of air flow on the drop in static pressure in granular masses of the quinoa cultivar Real, with different levels of impurity and adjust the mathematical models to the obtained experimental data selecting those that best represent the phenomenon. The product was initially free of impurities and with moisture content of 17% on dry weight basis. To check the influence of impurities on resistance to air flow, additions of these impurities were made at 1, 2, 3, 4, and 5%. Using a piece of equipment duly designed and built and air flows ranging from 0.1 to 0.4 m 3 s -1 m -2 , the static pressures of clean quinoa and quinoa with impurities were determined. The equations commonly used to describe the phenomenon were adjusted to the experimental data of pressure drop. The results permit to conclude that: a) static pressure in a column with quinoa grains increases with the increase in air flow; b) increase in the level of impurity lead to a reduction in the static pressure drop; c) the equations that best represent the experimental data of pressure drop inside the bed with quinoa grains, with and without impurities, were the Shedd and Guimarães equations, respectively.

A B S T R A C TThe thermal dissipation probe (Granier method) is useful in the water deficit monitoring and irrigation management of African Mahogany, but its model needs proper adjustment. This paper aimed to adjust and validate the Granier sap flux model to estimate African Mahogany transpiration, measure transpiration using lysimeter and relate it to atmospheric water demand. Weather conditions, transpiration and sap flux were monitored in three units of 2.5-year-old African Mahogany trees in constant water table lysimeter, in Goiânia, GO. . SA was significant (F < 0.05). Due the root confinement, the transpiration showed low correlation, but positive, with the atmospheric water demand.Transpiração de Mogno Africano com método de Granier e com lisímetro de lençol freático constante R E S U M ONo monitoramento do déficit hídrico e no manejo da irrigação do Mogno Africano, o uso da sonda de dissipação térmica (método de Granier) é útil porém necessita de ajuste do modelo. Objetivou-se ajustar e validar a equação proposta por Granier para estimativa da transpiração em Mogno Africano e a partir da lisimetria medir a transpiração e relacioná-la com a demanda hídrica atmosférica. Monitoraram-se as condições meteorológicas, a transpiração e o fluxo de seiva em três plantas de 2,5 anos de idade de Mogno Africano em lisímetros de lençol freático constante, em Goiânia, GO. Avaliou-se: a área de xilema ativo (AS), a área foliar (AF), a transpiração medida pelo método do lisímetro (T LIS ) e estimada pelo fluxo de seiva (T FS 1,231 . AS foi significativo (F < 0,05). Devido ao confinamento radicular, a transpiração teve baixa correlação, porém positiva, com a demanda hídrica atmosférica.

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