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Search Results: 1 - 10 of 224902 matches for " José Anchieta de;Teixeira "
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Farelo de trigo na alimenta??o de poedeiras semipesadas na fase de recria
Araujo, Daniel de Magalh?es;Silva, José Humberto Vilar da;Araujo, José Anchieta de;Teixeira, Elisanie Neiva Magalh?es;Jord?o Filho, José;Ribeiro, Marcelo Luís Gomes;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000100009
Abstract: this study aimed to evaluate the effect of the inclusion of the wheat bran (wb) in the ration on egg brown chicken (lohmann brown) performance in the growing phase 1 (7 to 19 week of age) and growing phase 2 (15 to 19 week of age) and its residual effects on initial egg production. one hundred-sixty chickens were allotted to a completely randomized design with four level of wb in the ration: 0 (control), 10, 20 and 30%, that resulted in four treatments, with five replicates of eight birds in the growing phase 1. at the 14th week, the birds were transferred to galvanized wire cages and reallocated in six replicates of six birds each. a total of 144 birds were used and, randomly, four birds per treatment were discarding per treatment, constituting the growing phase 2. the addition of the wb linearly decreased the final body weight and the weight gain, resulting in decreasing of 1.15 g and 0.0 3g, respectively for each 1% of wb inclusion in the ration. water intake show a quadratic effect and increased in absolute values with the addition of wb from 0 to 30%. the birds age at the first egg production and egg weight increased 0.6 day and 0.22 g, respectively for each 1% of wb in the ration. the inclusion of wb reduces chickens growth rate, delays posture starting and improves egg initial weight when compared to corn and soybean meal based diets.
Farelo de trigo e complexo enzimático na alimenta??o de poedeiras semipesadas na fase de produ??o
Araujo, Daniel de Magalh?es;Silva, José Humberto Vilar da;Miranda, Edma Carvalho de;Araujo, José Anchieta de;Costa, Fernando Guilherme Perazzo;Teixeira, Elisanie Neiva Magalh?es;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000500010
Abstract: the study was carried out with the objective to evaluate the effects of the inclusion of the wheat bran (wb) with or without supplementation of an enzymatic complex (ec) on the performance of semi-heavy hens in the egg-production phase. a total of 288 lohmann brown pullets were used, distributed to a completely randomized design in 4 × 2 factorial arrangement, composed by four wb levels (0, 3, 6 and 9%) in the ration and enzymatic complex supplementation (0 or 100g/100 kg diet), with eight treatments and six replicates of six birds. the enzymatic complex contained the enzymes b-galactosidase, galactomananase, xilanase and a-glucanase. feed intake, final body weight, egg production, egg weight, egg mass, egg mass feed conversion or egg dozen feed conversion was not affected by wb inclusion in the diets. egg shell specific gravity deteriorated as wb levels increase in the diets. none of the characteristics was affected by the enzymatic complex supplementation, except for egg weight, that improved from 62.74 to 64.28 g. then, the use up to 9.0% of wheat bran in the ration is recommended for semi-heavily chickens in the production phase. the supplementation of a-galactosidase, galactomannanase, xylanase and a-glucanase improve egg weight.
Insights on the fractal-fracture behaviour relationship
Rodrigues, José de Anchieta;Pandolfelli, Victor Carlos;
Materials Research , 1998, DOI: 10.1590/S1516-14391998000100008
Abstract: the fractals theory has been increasingly applied in the field of materials science and engineering. models of fractal lines and surfaces have been generated to describe the microstructural features of materials. special interest is placed upon a description of the fracture surface based on a fractal geometry in order to understand the crack path in materials. several papers have demonstrated the relationship between the fractal dimension of a fracture surface and the values of roughness and fracture toughness. in this work an extension of the theory of fractals for ceramic materials is proposed, to which the crack deflection toughening mechanism is thought to be related. in order to accomplish this objective, a review describing the concept of fractals and its relationship with the fracture toughness is presented. in the following part, a correlation between fractal dimension, total energy of fracture and the average resistance to crack propagation is proposed; all these parameters being dependent on the history and on the complexity of crack propagation path.
Insights on the fractal-fracture behaviour relationship
Rodrigues José de Anchieta,Pandolfelli Victor Carlos
Materials Research , 1998,
Abstract: The fractals theory has been increasingly applied in the field of materials science and engineering. Models of fractal lines and surfaces have been generated to describe the microstructural features of materials. Special interest is placed upon a description of the fracture surface based on a fractal geometry in order to understand the crack path in materials. Several papers have demonstrated the relationship between the fractal dimension of a fracture surface and the values of roughness and fracture toughness. In this work an extension of the theory of fractals for ceramic materials is proposed, to which the crack deflection toughening mechanism is thought to be related. In order to accomplish this objective, a review describing the concept of fractals and its relationship with the fracture toughness is presented. In the following part, a correlation between fractal dimension, total energy of fracture and the average resistance to crack propagation is proposed; all these parameters being dependent on the history and on the complexity of crack propagation path.
Correlation between fracture toughness, work of fracture and fractal dimensions of Alumina-mullite-zirconia composites
Santos, Sérgio Francisco dos;Rodrigues, José de Anchieta;
Materials Research , 2003, DOI: 10.1590/S1516-14392003000200017
Abstract: the purpose of this work is to show the correlation between the fractal dimension, d, and mechanical properties such as work of fracture, gwof, and fracture toughness, kic. alumina-mullite-zirconia composites were characterized by the slit-island method, sim, to obtain values of d and its fractional part, d*. the fracture surface roughness was also evaluated using a cyclic voltametric method. it will be shown that there is a positive experimental dependency of gwof on d* and that there is not an evident correlation between kic and d*.
Correlation between fracture toughness, work of fracture and fractal dimensions of Alumina-mullite-zirconia composites
Santos Sérgio Francisco dos,Rodrigues José de Anchieta
Materials Research , 2003,
Abstract: The purpose of this work is to show the correlation between the fractal dimension, D, and mechanical properties such as work of fracture, gammawof, and fracture toughness, K Ic. Alumina-mullite-zirconia composites were characterized by the slit-island method, SIM, to obtain values of D and its fractional part, D*. The fracture surface roughness was also evaluated using a cyclic voltametric method. It will be shown that there is a positive experimental dependency of gammawof on D* and that there is not an evident correlation between K Ic and D*.
Estuarine ichthyofauna of the Paragua?u River, Todos os Santos Bay, Bahia, Brazil
Reis-Filho, José Amorim;Nunes, José de Anchieta Cintra da Costa;Ferreira, Amanda;
Biota Neotropica , 2010, DOI: 10.1590/S1676-06032010000400034
Abstract: estuaries are areas of recognized importance in the development and sanctuaries of fishes and also a great source of fishing resources. this article presents an inventory of fishes from the paragua?u river estuary, todos os santos bay, bahia, brazil. 28 points comprising the saline sections that may exist in a tropical estuary were sampled quarterly from march 2009 to february 2010 with the aid of bottom gill nets, surface gill nets, seine net and casting net. a total of 4.097 individuals were captured, belonging to 7 species of chondrichthyes and 117 species of actinopterygii (83 genera and 49 families). most of the geographical extent of the estuary was sampled by assessing large spatial variability in fish assemblage structure. the curve of species accumulation (rarefaction) had stabilization with ? of the samples. the general structure of the assemblage is described and commented trough evidences for a new spatial organization of the fish fauna due to dam effects upstream the estuary.
Avalia??o do método das adi??es de analito para a determina??o de sódio em álcool combustível por espestrometria de emiss?o at?mica em chama
Oliveira, Adriana Paiva de;Okumura, Leonardo Luiz;Gomes Neto, José Anchieta;Moraes, Mercedes de;
Eclética Química , 2002, DOI: 10.1590/S0100-46702002000200024
Abstract: the analyte additions method was applied for sodium determination in fuel ethanol by atomic emission spectrometry. graphics involving emission intensity versus analyte concentration in the 0 - 0.300 mg na l-1 interval concentration range contaning 2.1 g k l-1 as an ionisation buffer. twenty samples of commercial fuel ethanol were collected in differents gas stations located in araraquara city, analyzed and results obtained varied from 0.0072 to 1.55 mg na l-1. the limits of detecction (l.o.d.) varied from 0.0026 to 0.0239 mg na l-1. recoveries varied in the 95 - 104 % interval. the relative standard deviations (n=12) for three analyte additions in all samples were £ 4,1 %.
Study of the dimensions of double-torsion test specimens
Albuquerque, Maria da Consola??o Fonseca de;Rodrigues, José de Anchieta;
Materials Research , 2008, DOI: 10.1590/S1516-14392008000300009
Abstract: double-torsion tests were carried out to ascertain whether a thin test specimen would affect the results of this test. the tests involved two test specimen sizes, one with a thickness five-fold greater than the particle size of the material and the other with a three-fold greater thickness. the width of both test specimens was ten times that of their thickness and their length was double their width. the material utilized was an alumina-based refractory castable without cement. it is important to ascertain the influence of the thickness of double-torsion test specimens when materials with a coarse microstructure are involved. otherwise, test specimens would have to be very large, rendering the experimental procedure difficult, as in the case of the size of sintering furnaces and the size of accessories for the test. this study shows that test specimens with lower thicknesses are representative when one analyzes the calibration curve of the compliance, the length of the crack at which the break occurred (critical crack length), and the shapes of the r-curve and of the load (p) vs. displacement curves. however, the analysis of the mean values of r (r), obtained by the arithmetic average of the r values in the section of stable crack propagation and the total fracture energy (γwof), showed that these values are dependent on the size of the test specimens, indicating that this subject deserves further investigation.
Characteristics of the double-torsion test to determine the R-curve of ceramic materials
Albuquerque, Maria da Consola??o Fonseca de;Rodrigues, José de Anchieta;
Materials Research , 2006, DOI: 10.1590/S1516-14392006000400004
Abstract: double-torsion tests were carried out on a commercial ceramic floor tile to verify whether this test is suitable for determining the r-curve of ceramics. the instantaneous crack length was obtained by means of compliance calibration, and it was found that the experimental compliance underestimates the real crack length. the load vs. displacement curves were also found to drop after maximum loading, causing the stress intensity factor to decline. the r-curves were calculated by two methods: linear elastic fracture mechanics and the energetic method. it was obtained that the average values of crack resistance, r, and the double of the work of fracture, 2 × gwof, did not depend on notch length, a0, which is a highly relevant finding, indicating that these parameters were less dependent on the test specimen's geometry. the proposal was to use small notches, which produce long stable crack propagation paths that in turn are particularly important in the case of coarse microstructures.
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