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Palmas de Monte Alto, Brazil

De Miranda Rios V.,University of Tocantins | De Castro Monteiro C.,Fecleral Institute of Education | Cunha V.C.,University of Brasilia
International Conference on Advanced Communication Technology, ICACT

This article presents two proposals in order to solve the problem of choosing the best access network available in the environment where the user is located. One based on a combination of fuzzy logic technique with two decision-making methods, AHP (Analytic Hierarchy Process) and GRA (Grey Relation Analysis), and the other based only on fuzzy logic technique. In order to demonstrate the effectiveness of these proposals, they were compared with a third one, of the authors in [7], which uses a combination of AHP method with a cost function. The obtained results show that the two proposals presented in this paper are more efficient in sorting and selecting the best access network when compared to the third. © 2014 Global IT Research Institute (GIRI). Source

Dias D.C.F.S.,Federal University of Vicosa | Oliveira G.L.,Federal University of Vicosa | Vallory G.G.,Federal University of Vicosa | da Silva L.J.,Federal University of Vicosa | Soares M.M.,University of Tocantins
Journal of Seed Science

Oil seeds, such as J. curcas, are more prone to deterioration and consequently to loss of quality during storage. In this context, adequate technics for its preservation are of great importance. This study aimed to evaluate the effects of different environments and packaging for the conservation of J. curcas seeds during twelve months of storage. The seeds were placed in three different types of packaging: a multiwall paper bag (or Kraft paper bag); a cloth bag; and a high-density plastic bag. After this, the seeds were stored in three different conditions: a laboratory (23 ± 3 °C; 64 ± 11% of RH); a refrigerated room (20 ± 2 °C; 55 ± 5% of RH) and a cold chamber (10 ± 2 °C; 55 ± 5% of RH). Initially and thereafter every three months, the physiological qualities (germination and vigor) of the seeds were evaluated. J. curcas seeds packed in the plastic bags and stored in a cold chamber maintained their germination potential during twelve months. There was a decline in the physiological quality of the seeds stored in the laboratory conditions, independent of the packaging used. It was concluded that the most suitable condition for the storage of J. curcas seeds was packing them in plastic bags, placed in a cold chamber (10 ± 2 °C; 55 ± 5% of RH). © 2016, Associacao Brasileira de Tecnologia de Sementes. All rights reserved. Source

Rambo M.K.D.,University of Campinas | Rambo M.K.D.,University of Tocantins | Alves A.R.,Sugarcane Research Center | Garcia W.T.,Sugarcane Research Center | Ferreira M.M.C.,University of Campinas

Near infrared (NIR) spectroscopy was used to determine the content of Klason lignin, acid-soluble lignin, total lignin, extractives, ash, acid-insoluble residue, glucose, xylose, rhamnose, galactose, arabinose, mannose and total sugars in coconut residues. The samples were analyzed at several processing stages: wet unground (WU), dried unground (DU) and dried and sieved (DS). Partial least squares models were built, and the models for the analytes exhibited R2>0.80, with the exceptions of rhamnose, arabinose, galactose, mannose and ash from all fractions, and the lignin content from the WU fraction, which were predicted poorly (R2<0.70). There were some significant differences between the models for the main lignocellulosic components at the various stages of biomass. These results proved that NIR spectroscopy is useful for analysis at biorefineries, and it can be used as a faster and more economical alternative to the standard methods. © 2015 Elsevier B.V. All rights reserved. Source

De Miranda Rios V.,University of Tocantins | De Lira Gondim P.R.,University of Brasilia | De Castro Monteiro C.,Federal Institute of Education
International Conference on Advanced Communication Technology, ICACT

Two proposals are presented in this study in an attempt to solve the problem of network selection, which are based on fuzzy logic techniques and methods of decision making. The first proposal uses a combination of the fuzzy method with two MADM (Multiple Attribute Decision Making) methods, the AHP (Analytic Hierarchy Process) and the GRA (Grey Relational Analysis), whereas the latter uses only the fuzzy logic technique. The two are compared with each other and with a third proposal, which uses a combination of AHP method along with a cost function. The results show that the two proposals presented in this paper are more efficient to sort and select the best access network compared to the third one. © 2012 GIRI. Source

Evaristo A.B.,University of Tocantins | Grossi J.A.S.,Federal University of Vicosa | Pimentel L.D.,Federal University of Vicosa | de Melo Goulart S.,Federal University of Vicosa | And 3 more authors.
Industrial Crops and Products

Macauba (Acrocomia aculeata), also known as macauba palm, is a good source of vegetable oil in tropical America. Its fruits are highly suitable for biodiesel production owing to the high quantity and quality of its oil. However, commercial exploitation of this species remains insufficient. Forms of harvesting, the storage period, and the use of chemicals for the postharvest preservation of macauba fruits and their effects on the associated microbiota were investigated. Mature fruits were collected only once from the mother tree and separated in two groups, a group of fruits not exposed to the ground surface (0 days) and a larger group of fruits that was placed in contact with the soil surface for 7, 14, and 21 days, to allow infestation of soil-borne microorganisms. Then the fruits were treated with 3 doses of fungicide fungicide (0, 0.2, and 0.4% v/v) and storage at room temperature during 0, 10, 20, 30 and 40 days. Hence the experiment was set in a randomized block design with four replications in a factorial Scheme 4 × 3 × 5 (period of ground surface contact, doses of fungicide and period of storage). The mesocarp oil content (OC), free fatty acids, and oxidative stability of the oil were evaluated, and the presence of microorganisms in the mesocarp and epicarp of the macauba fruits was quantified. Fungicide was found to be effective in maintaining low oil acidity of fruits unexposed to the soil surface for up to 20 days of storage and for maintaining oil oxidative stability. Regardless of the fungicide dose applied, an increase in the OC was noted for all harvest times during the first 10 days of storage. Therefore, for biodiesel production, it is recommended that the fruits should be harvested when in pre-absciscion stage (directly from the mother tree) or collected from the ground after no more than 7 days after abscission. In both cases, the fruits must be pre-treated with fungicide if storage is intended. © 2016 Elsevier B.V. Source

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