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Coriolano Cavalcanti De Lacerda K.J.,Centro Universitario Da Fundacao Educacional Of Barretos | Coriolano Cavalcanti De Lacerda K.J.,Federal University of Paraiba
IEEE Latin America Transactions | Year: 2016

The branch of optical communications has been expanding and opening new frontiers and in view of this development, we research and develop experimental techniques, for creating optical fibers with chemicals inserted, because considering that the interaction between a beam of resonant light and an atomic vapor, result in the process known as stimulated emission can, from this process, do the interconnect of atomic physics with the optical communications, but precisely in the sensing area of high precision, because this interaction changes the modal behavior of the waveguide. This paper discusses some of the techniques developed for the creation of these optical fibers, and the development and experimental analyzes performed, with the possible applications of these techniques in telecommunications, sensing area. © 2016 IEEE. Source


Chud T.C.S.,Sao Paulo State University | Caetano S.L.,Centro Universitario Da Fundacao Educacional Of Barretos | Buzanskas M.E.,Sao Paulo State University | Grossi D.A.,University of Guelph | And 5 more authors.
Livestock Science | Year: 2014

The aim of this study was to estimate variance and covariance components for gestation length (GL), birth weight (BW), weaning weight (WW), and accumulated productivity (ACP), and their respective genetic trends for Nellore cattle raised in Brazil. The ACP trait is a reproduction index developed by the National Association of Breeders and Researchers (ANCP) and comprises the total number of calves born per dam, weight of weaned calves, and age of the dam at calving. A total of 25,085, 46,911, 50,044, and 7351 observations were considered to analyze GL, BW, WW, and ACP. Genetic parameters were estimated by the Average Information Restricted Maximum Likelihood method in single and two-trait analyses. The average direct heritability estimates obtained in two-trait analyses were equal to 0.38±0.03 (GL), 0.25±0.02 (BW), 0.28±0.02 (WW), and 0.11±0.02 (ACP). The highest genetic correlation was found between BW and WW (0.36±0.05), followed by BW and ACP (0.20±0.09), and BW and GL (0.19±0.06). Significant direct genetic trends (. P<0.001) were observed for GL, BW, and WW equal to -0.027 days per year, 0.073. kg per year, and 0.8456. kg per year, respectively. Greater emphasis should be given to accumulated productivity and gestation length traits in order to increase the number and weight of weaned calves. As accumulated productivity presents low heritability estimates, genetic improvement through selection could be slow in the Nellore breed. Our study reports genetic progress for weaning weight, since its genetic trend has increased over the years. Similar genetic trend for birth weight was observed, which may be a consequence of selection towards higher body weights at older ages. © 2014 Elsevier B.V. Source


Silva A.F.,Sao Paulo State University | Cruz C.,Centro Universitario Da Fundacao Educacional Of Barretos | Pitelli R.L.C.M.,ECOSAFE | Pitelli R.A.,Sao Paulo State University
Planta Daninha | Year: 2014

This study aimed to evaluate feed preference and control efficacy of grass carp (Ctenopharyngodon idella) on the aquatic macrophytes Ceratophyllum demersum, Egeria densa and Egeria najas. An experiment was carried out at mesocosms conditions with 2,000 liters capacity and water residence time of 2.8 days. C. demersum, E. densa e E. najas biomasses were offered individually with sixty g and coupled in similar quantities of 30 g of each species, evaluated during 81 days, envolving 6 treatments. (1 - C. demersum, 2 - E. najas, 3 -E. densa, 4 - C. demersum + E. najas, 5 - C. demersum + E. densa and 6 - E. najas + E. densa). When offered individually, E. najas and C. demersum presented the same predation rate by grass carp, which was higher than E. densa predation rate. When plants were tested in pairs, the order of feed preference was C. demersum > E. najas > E. densa. E. najas and C. demersum percentage control ranged from 73 to 83%. No relation between biomass consumption and grass carp body weight gain was observed, probably due to differences in nutritional quality among macrophyte species according to fish necessities. Therefore, it is concluded that the use of grass carp is one excellent technique to control submersed macrophytes in Brazil. © 2014 Planta Daninha All rights received. Source


Malerbo-Souza D.T.,Centro Universitario Da Fundacao Educacional Of Barretos | Halak A.L.,State University of Maringa
Zootecnia Tropical | Year: 2013

The objectives of this work were to study the floral biology, biodiversity and behavior of pollinators in flowering orange (Citrus sinensis L. Osbeck), variety "Pera-Rio", in six different places, in six years, and its effect on fruit production. The frequency of insects was obtained by counting the first 10 minutes at a time, from 7h00 to 18h00, with three replications. For fruit set, 300 fl ower buds were marked, 150 discovered and 150 of them kept covered, preventing the visit of the insects. Fruits were evaluated for count, number of buds and seeds, weighed (g), height (cm), width (cm), flesh thickness (mm), volume (ml) and pH juice. The insects more frequent observed were honeybees Apis mellifera, others Hymenoptera, Lepidoptera, Vespidea and Coleoptera (beetles). Africanized bees preferred to collect nectar compared to pollen. Trigona spinipes bees preferred to collect pollen compared to nectar and Lepidoptera (butterfl ies) feeding on nectar. It was observed 9.6% increase in fertilization of the fl owers and 7.35% in fruit production visited freely. The Africanized honeybee was more frequent species in the fl owers. There was an increase in fruit set of fl owers with the presence of insects. The fruits that were visited by pollinators were higher, sweeter, with more seeds and quantity of juice. Source


Lahr F.A.R.,University of Sao Paulo | Christoforo A.L.,Federal University of Sao Carlos | Silva C.E.G.D.,Centro Universitario Da Fundacao Educacional Of Barretos | Andrade Junior J.R.D.,University of Sao Paulo | Pinheiro R.V.,Mato Grosso State University
Revista Arvore | Year: 2016

This research aimed to investigate the influence of the extraction regions (Caracarí and Bonfim municipalities – South of Roraima; Alta Floresta municipality – North of Mato Grosso) of Jatobá (Hymenaea stilbocarpa) wood. The moisture content (saturated wood at 12%) was also evaluated in fifteen physical and mechanical properties of interest. Altogether, 840 samples were prepared and tested, according to the requirements of the Brazilian standard ABNT NBR 7190. ANOVA results (at 5% significance level) showed that the extraction region of the samples was not significant in the physical and mechanical properties evaluated, since equivalent values were obtained regardless of location, highly interesting aspect to the extent that it is not always possible to identify the extraction region of the tropical hardwood. This importance is even greater in the case of the use of wood as an element, the reference values of which are pointed out in the Annexes of the Brazilian standard. With respect to the moisture content, a significant difference was noted in only eight of the fifteen evaluated properties. The condition of 12% of moisture content showed mean values higher than the saturated condition in the strength properties in the parallel compression (37%), resistance in parallel tension (29%) and shear (36%) strength in the direction parallel to the grain, bending strength (26%), elasticity modulus in parallel compression (9%) and 200 parallel directions (35%) and normal (28%) directions to the grain, and lower in bulk density. © 2016, Sociedade de Investigacoes Florestais, All rights reserved. Source

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