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Silveira J.V.,Federal University of Ceara | Vieira L.L.,University of Campinas | Filho J.M.,Federal University of Ceara | Sampaio A.J.C.,University Vale do Acarau | And 2 more authors.
Journal of Raman Spectroscopy | Year: 2012

This paper reports a study of vibrational, structural and morphological properties of molybdenum oxide nanoribbons. Temperature-dependent Raman spectroscopy measurements in MoO 3 nanoribbons revealed morphological changes in the 150-350 °C temperature range. No structural phase transitions were observed, thus showing that the orthorhombic phase is stable from room temperature (nanoribbons) up to 650°C (bulk-like phase) where large plates have been formed by the coalescence of the nanoribbons. The interpretation of temperature-dependent Raman data (wavenumber and linewidths) is supported by scanning electron microscopy that is used to directly probe the morphological changes in MoO 3 samples. The observed phenomena in the Raman data for MoO 3 nanoribbons can be applied to other nanomaterials. Copyright © 2012 John Wiley & Sons, Ltd. Temperature-dependent Raman spectroscopy measurements in MoO 3 nanoribbons revealed morphological changes in the 150-350°C temperature range. The interpretation of temperature-dependent Raman data is supported by scanning electron microscopy, which was used to directly probe the morphological changes in MoO 3 samples. The observed phenomena in the Raman data for MoO 3 nanoribbons can be applied to other nanomaterials. Copyright © 2012 John Wiley & Sons, Ltd. Source


Martins J.A.P.,University Vale do Acarau | Correia S.L.O.B.,State University of Ceara | Junior J.C.,State University of Ceara
ICT 2010: 2010 17th International Conference on Telecommunications | Year: 2010

Mobile ad hoc networks are a set of wireless mobile devices that communicate without fixed infrastructure, forming temporary networks dynamically. Each node in such a network is more than a data receiver/sender, it is also a router that forwards data packets to its proper destination. The main characteristics of ad hoc networks are frequent change in the network topology, limited power of its links and restriction on the bandwidth. A routing protocol for ad hoc networks is composed of a routing algorithm with a set of rules that monitor the operation of the network. Thus, the nodes participating in the network have an important role in the management of resources in ad hoc networks. Ant-based routing is an efficient routing scheme based on the behavior of foraging ants. The study of the collective behavior of ants shows that they are able to find the shortest path from the nest to a food source, using a particular mode of communication by the means of a chemical substance called pheromones. This work uses a mechanism from collective intelligence applied to ad hoc networks, in particular the application of ants for routing in ad hoc networks. We have brought some characteristics from the Dynamic MANET On-demand Routing protocol and other MANET protocols in order to propose the new routing algorithm, called Ant-DYMO. We compare Ant-DYMO with DYMO, and we show that our proposition has improved the packet loss and the end-to-end delay. © 2009 IEEE. Source


Silva V.L.,Federal University of Minas Gerais | Rogerio M.C.P.,Embrapa Caprinos e Ovinos | Bomfim M.A.D.,Embrapa Caprinos e Ovinos | Landim E.R.L.,University Vale do Acarau | And 3 more authors.
Revista Brasileira de Saude e Producao Animal | Year: 2013

This study aimed to evaluate the inclusion of cashew nut meal (CNM) offered to lambs of three genetic groups on intake and digestibility of dietary nutrients. Eighteen male lambs, 1/2 Dorper x 1/2 native, 1/2 Somalis x 1/2 native and 1/2 Santa Inês x 1/2 native, with body weight of 22,66. The control diet, constituted Aruana's hay, corn, soybean meal. The test diet was constituted of these feed plus CNM, Acompletely randomized design in a factorial project 3 x 2, three genetic groups versus two diets (with or without CNM) with three replicates per treatment.Higher intakes were obtained for the animals 1/2 Dorper x 1/2 native compared to animals 1/2 Santa Inês x 1/2 native, being similar to the animals 1/2 Somalis x 1/2native. There was significant interaction only for the DM digestibility. Lower digestibilities were observed for animals 1/2 Santa Ines x 1/2 native in the diet containing the CNM. Lower digestibilities of ADF and HCEL were observed in the diets with the inclusion of CNM. For the genetics groups, NDF, ADF and HCEL digestibilities higher it was verified to the animals 1/2 Dorper x 1/2 native comparedto theanimals 1/2 Santa Inês x 1/2 native, being both similar to the animals 1/2 Somalis x 1/2 native. The inclusion of CNM has a negative effect on the digestibilities of fibrous fractions, especially on the hemicellulose, resulting in reduction on the digestibility of dietary DM in the 1/2 Santa Inês x 1/2 native. Source


do Nascimento E.N.,University Vale do Acarau | Rogerio M.C.P.,Embrapa Caprinos e Ovinos | Batista A.S.M.,University Vale do Acarau | Carneiro M.S.S.,Federal University of Ceara | And 6 more authors.
Revista Brasileira de Saude e Producao Animal | Year: 2012

This work aimed to determine the nutrient intake and quantitative aspects of sheep carcass from three different genetic groups. Eighteen animals with initial average body weight of 20.1kg were used in a completely randomized design, in a factorial 3x2 scheme (three different crossbreeds - 6 F1Dorper x non defined breed, 6 F1Somalis x non defined breed and 6 F1Santa Inês x non defined breed versus two diets). The diets fed to the animals were formulated with or without cashew nuts. The inclusion of cashew nut meal in the diet influenced nutrient intake. Differences of intake among the animal groups were observed as higher intake for F1Dorper x non defined breed (NDB), followed by F1Somalis x NDB and for F1Santa Inês x NDB. However, the control diet produced no difference among these genotypes. The average daily gain was lower for both crossbreeds when cashew nut meal was added in the diets. The evaluated crossbreeds and diets did not affect the feed:gain ratio. The carcasses analyses showed that the inclusion of cashew nut meal in the diets reduced the cold carcass weight and the rib weight. The addition of cashew nut meal in the diets for lambs reduces food intake and carcass yield. The crossbreed F1Dorper x NDB presented the higher rate of average daily gain. Source

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