Botelho F.M.,ICAA UFMT |
Correa P.C.,Federal University of Viçosa |
Goneli A.L.D.,km 12 Campus Universitario |
Martins M.A.,Federal University of Viçosa |
And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2011
The aim of this work was to study the infrared drying process of carrot slices and to determine coefficients related to the heat and mass transfer of the process. Fresh carrots were used, dried until constant weight in a dryer with infrared heating source. Different models were utilized to fit the experimental data of constant and falling drying rate periods. It was verified that the coefficients of heat and mass transfer, during the constant drying rate, significantly increased with temperature on rise. The Diffusion Approximation, Two Terms, Midili and Verna models satisfactory represented the falling period of drying rate of carrot slices. The effective diffusion coefficient increased with temperature and this relationship can be represented by the Arrhenius equation, obtaining activation energy to the drying process of 29.092 kJ mol -1.
Faria E.F.,Av. Alexandre Ferronato |
Lopes L.B.,Embrapa Agrosilvopastoral |
Dos Reis Krambeck D.,Av. Alexandre Ferronato |
Dos Santos Pina D.,ICAA UFMT |
Campos A.K.,s n Campus Universitario
Agroforestry Systems | Year: 2015
Trichostrongylids nematodes are capilliform worms that parasitize the gastrointestinal tract of ruminants that frequently cause serious injuries such as severe gastroenteritis and acute anemia. Sheep breeds are highly susceptible to these parasites, including adult animals as well. In sheep herds, this parasitic disease is traditionally controlled through the use of antihelminthics; however, some possible auxiliary methods of control have been suggested, and among them is the adoption of the integration livestock–forest system. The aim of the present study was to evaluate comparatively the recovery of trichostrongylid nematode larvae (L3) from sheep in a integration livestock–forest system and in grass monoculture, also analyzing the climatic influence in the four seasons of the year. The study was carried out from December 2013 to September 2014 in the experimental field of Embrapa Agrosilvopastoral located in the municipality of Sinop/MT, Brazil. In each season of the year, each treatment received thirty samples of feces weighing 20 g and containing approximately 60,000 eggs of trichostrongylid nematodes. At the end of 14 days, the remaining feces from the soil surface, as well as soil below the deposition area, and the adjacent forage near the feces were collected and taken to the laboratory where the number of infective larvae per kilogram of dry matter (L3/kg DM) in each collected material was determined. The recovery of L3 larvae was possible in all seasons and in all samples collected. There was a significant interaction between treatments and seasons of the year (p < 0.05). The silvopastoral system showed greater counts of L3/kg DM in the forage during the spring, summer, and winter collections. The feces collected in the winter were the material with highest counts of L3/kg DM in the study, with 30,199 in silvopastoral area, and 22,020 in grass monoculture, which differed significantly (p < 0.05). The soil also showed the same response, with 6112.74 L3/kg DM in silvopastoral system and 4847.56 L3/kg DM in grass monoculture, which were also significantly different (p < 0.05). © 2015 Springer Science+Business Media Dordrecht
da Silva C.R.P.,Consultoria Florestal |
Latorraca J.V.F.,Federal Rural University of Rio de Janeiro |
do Carmo J.F.,ICAA UFMT |
Mojena P.A.,ICAA UFMT
Floresta | Year: 2014
The objective of this study was to determine and evaluate the yield of four (4) diameter classes in function of quality of logs, in logwood processing of Cedrinho (Erisma uncinatumWarm.). 20 logs of four diameter classes between 46 and 85 cm were selected and classified in terms of quality, being 5 logs for each diameter class. Diameter class I resulted in the lowest yield and diameter class III showed the highest yield. Yield increased according to the diameter of the logs in classes I, II and III. Class IV logs with larger diameters had quality defects such as cracks and internal flaws, causing a small yield drop. It could be concluded that there was a correlation between diameter and yield.