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Search Results: 1 - 10 of 125591 matches for " Rafael O. Batista "
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Floristic and phytosociological description of a riparian forest and the relationship with the edaphic environment in Caiuá Ecological Station - Paraná - Brazil
Costa Filho, Lysias Vellozo da;Nanni, Marcos Rafael;Campos, Jo?o Batista;
Brazilian Archives of Biology and Technology , 2006, DOI: 10.1590/S1516-89132006000600013
Abstract: relationship in soil physical and chemical properties of soil, floristic and phytosociological association of semi-deciduous riparian forest of the paranapanema river (r) and rosana reservoir (re) in the caiuá ecological station were evaluated. aerial photography and satellite image were used to determine the forest cover and to locate 15 transects 50 x 30m (1500m2),which were used to sample trees with diameters at breast height (dbh)>15 cm. r contained 1487 individuals from 33 families, 64 genders and 73 species. the shannon-weaver index (h') was 3.318. re contained 1146 individuals from 35 families, 72 genders and 85 species and the h' was 3.755. there was a statistically significant difference (p<0.05) between r and re environments and statistically significant correlations (p<0.05) were detected between soil physical attributes and importance values (iv) using the detrended correspondence analysis (dca).
Eficácia do tratamento Ovsynch associado à insemina o artificial prefixada em rebanhos Bos taurus e Bos indicus
Alvarez Rafael Herrera,Martinez Antonio Campanha,Carvalho Jo?o Batista Pereira de,Arcaro Juliana Rodrigues Pozzi
Pesquisa Agropecuária Brasileira , 2003,
Abstract: O presente trabalho objetivou avaliar a eficácia do tratamento Ovsynch associado à insemina o artificial em tempo prefixado em vacas Bos taurus e Bos indicus. Foram utilizados rebanhos das ra as Holandesa, Caracu, Nelore e Mantiqueira. Também foi incluído um rebanho de vacas Gir, com problemas de fertilidade. Cada rebanho foi dividido em três grupos. O grupo 1 recebeu o tratamento Ovsynch e foi inseminado em tempo prefixado. O grupo 2 foi inseminado no cio induzido com cloprostenol. O grupo 3 foi inseminado no cio natural. As taxas de concep o e de prenhez foram determinadas por ultra-sonografia. N o existiu intera o significativa das variáveis reprodutivas analisadas para rebanho, idade, período pós-parto, número de pari o e presen a do bezerro. A taxa de concep o n o diferiu (P>0,05) entre os grupos, ao passo que a taxa de prenhez foi superior (P<0,05) nos grupos 1 e 2 em compara o ao grupo 3. No rebanho Gir, o tratamento Ovsynch n o alterou a taxa de concep o nem a de prenhez. Independentemente da ra a, os tratamentos Ovsynch e cloprostenol n o afetam a taxa de concep o, mas melhoram a taxa de prenhez. O tratamento Ovsynch n o aumenta a fertilidade de vacas com problemas reprodutivos inespecíficos.
Obstru o e uniformidade de aplica o em sistemas de irriga o por gotejamento aplicando-se efluente da suinocultura Clogging and uniformity of application in drip irrigation systems operating with swine wastewater
Rafael O. Batista,Rubens A. Oliveira,Delfran B. dos Santos,Adriana de F. M. Oliveira
Revista Brasileira de Engenharia Agrícola e Ambiental , 2013,
Abstract: Neste trabalho buscou-se analisar o efeito de diferentes manejos de água residuária de suinocultura e de água de abastecimento na obstru o de emissores e na uniformidade de aplica o de sistemas de irriga o por gotejamento. O experimento foi realizado na Universidade Federal de Vi osa (UFV) e montado em esquema de parcelas subsubdivididas tendo, nas parcelas, os manejos (1E3A - uma hora de aplica o de efluente mais três horas de aplica o de água limpa, 2E2A - duas horas de aplica o de efluente mais duas horas de aplica o de água limpa, 3E1A - três horas de aplica o de efluente mais uma hora de aplica o de água limpa e 4E - quatro horas de aplica o de efluente), nas subparcelas os tipos de gotejador (G1, G2 e G3) e, nas subsubparcelas, os tempos das avalia es (0, 20, 40, 60, 80, 100, 120, 140 e 160 h) em delineamento inteiramente casualizado com três repeti es. Os resultados obtidos indicaram que na água residuária de suinocultura as características sólidos suspensos, ferro total e popula o bacteriana, representaram risco severo de entupimento de gotejadores e que houve redu o elevada da uniformidade de aplica o de efluente quando o tempo de aplica o de água residuária foi igual ou superior ao da água de abastecimento. This study aimed to evaluate the effect of different managments of swine wastewater and clean water on clogging of emitters and application uniformity of drip irrigation systems. The experiment was conducted in the experimental area of the Federal University of Vi osa (UFV) and mounted in a split split-plots, having in the plots the managments (1E3A - one hour of application of effluent and three hours of application of clean water, 2E2A - two hours of application of effluent and two hours of application of clean water, 3E1A - three hours of application of effluent and one hour of application of clean water and 4E - four hours of application of effluent), in the subplots the types of drippers (G1, G2 and G3) and in the subsubplots the evaluation times (0, 20, 40, 60, 80, 100, 120, 140 and 160 h) in a completely randomized design with three replications. The results indicated that in the swine wastewater the characteristics suspended solids, total iron and bacterial population represented severe risk of clogging of drippers; and that there was a high reduction of the uniformity of application of effluent when the time of application of wastewater is equal to or greater than the water supply.
Does self-ligating brackets type influence the hysteresis, activation and deactivation forces of superelastic NiTi archwires?
José Rino Neto,Gilberto Vilanova Queiroz,Jo?o Batista de Paiva,Rafael Yagüe Ballester
Dental Press Journal of Orthodontics , 2013,
Abstract: OBJECTIVE: To compare hysteresis, activation and deactivation forces produced by first-order deformation of Contour 0.014-in NiTi wire (Aditek, Brazil) in four brands of self-ligating brackets: Damon MX, Easy Clip, Smart Clip and In-Ovation. METHODS: Activation and deactivation forces were measured in an Instron universal tensile machine at 3 mm/minute speed to a total displacement of 4 mm. Tests were repeated eight times for each bracket/wire combination. Statistical analysis comprised ANOVA and Tukey's multiple comparisons test. RESULTS: Using a 4-mm deformation, mean activation forces increased in the following order: Damon = 222 gf, Easy Clip = 228 gf, In-Ovation = 240 gf and Smart Clip = 306 gf. The same order was observed for mean hysteresis values, i.e., 128 gf, 140 gf, 150 gf and 206 gf, respectively. The respective values of deactivation forces for the Damon, Easy Clip, In-Ovation and Smart Clip brackets were 94 gf, 88 gf, 90 gf and 100 gf. CONCLUSIONS: Brackets with higher activation forces were accompanied by higher hysteresis values, which resulted in clinically similar deactivation forces, regardless of the type of self-ligating brackets used. OBJETIVO: comparar as for as de ativa o, desativa o e histerese produzidas por deforma o de primeira ordem do fio superelástico Contour NiTi 0,014" (Aditek ) em quatro modelos de braquetes autoligáveis: Damon MX, Easy Clip, Smart Clip e In-Ovation. MéTODOS: as for as de ativa o e desativa o foram medidas em máquina universal de tra o Instron com velocidade de 3mm/minuto e deslocamento de 4mm. Em cada combina o braquete/fio foram executadas oito repeti es. A análise estatística empregou ANOVA e o Teste de Compara es Múltiplas de Tukey. RESULTADOS: com 4mm de deforma o, as for as médias de ativa o foram, em ordem crescente, Damon = 222gf, Easy Clip = 228gf, In-Ovation = 240gf e Smart-Clip = 306gf; a mesma ordem foi observada nas histereses médias, cujos valores foram, respectivamente, 128gf, 140gf, 150gf e 206gf; os valores das for as de desativa o foram, respectivamente, 94gf, 88gf, 90gf e 100gf. CONCLUS O: os braquetes com maiores valores nas for as de ativa o foram acompanhados por maiores valores na histerese, o que resultou em for as de desativa o clinicamente semelhantes, independentemente do tipo de braquete autoligável utilizado.
Simula o do campo elétrico e magnético de um canal i nico utilizando o software FEMM
Ricardo de Camargos Lopes,Rafael Leal Lima,Vanessa Pereira Gomes,Jo?o Batista Destro Filho
Exacta , 2010,
Abstract: This work presents a simulation study of the behavior of electric and magnetic fields on calcium ion channels through a simple model. The study considers a situation of resting potential at the ion channel, involving computer simulations, using the software Finite Element Method Magnetics (FEMM), which calculates these fields by finite element technique. On these simulations we can see how these fields behave along the channels, and from that understand better its normal and pathological behavior in the future. From these simulations it was concluded that the electric field is approximately constant along the channel, with a magnitude of at about 107[volts/meter], while the electrical potential varied linearly with the height. In terms of the magnetic field, it grows exponentially in the radial direction until the end of the pore, reaching its maximum (about 4.10-9[tesla]), and decreases rapidly from this point.
Evaluation of internal adaptation of Class V resin composite restorations using three techniques of polymerization
Pereira, José Carlos;D'Alpino, Paulo Henrique Perlatti;Lopes, Lawrence Gonzaga;Franco, Eduardo Batista;Mondelli, Rafael Francisco Lia;Souza, Jo?o Batista de;
Journal of Applied Oral Science , 2007, DOI: 10.1590/S1678-77572007000100011
Abstract: objective: the purpose of this in vitro study was to evaluate the internal adaptation of class v composite restorations to the cavity walls using three different techniques of polymerization. methods: standard cavities were prepared on the buccal and lingual surfaces of 24 extracted human third molars with margins located above and below the cementoenamel junction. restorations were placed in one increment using two restorative systems: 3m filtek a110/ single bond (m) and 3m filtek z250/ single bond (h) in the same tooth, randomly in the buccal and lingual surfaces. resin composites were polymerized using three techniques: group 1 - conventional (60 s - 600 mw/cm2); group 2 - soft-start (20 s - 200 mw/cm2 , 40 s - 600 mw/cm2); group 3 - pulse activation (3 s - 200 mw/cm2, 3-min hiatus, 57 s - 600 mw/cm2). buccolingual sections were polished, impressions taken and replicated. specimens were assessed under scanning electron microscopy up to x1000 magnification. scores were given for presence or absence of gaps (0 - no gap; 1 - gap in one wall; 2 - gap in two walls; 3 - gap in three walls). results: the mean scores of the groups were (±sd) were: g1m-3.0 (± 0.0); g2m-2.43 (± 0.8); g3m- 1.71 (± 0.9); g1h- 2.14 (± 1.2); g2h- 2.00 (± 0.8); g3h- 1.67 (± 1.1). data were analyzed using kruskal-wallis and dunnet's tests. no statistically significant difference (p>0.05) was found among groups. gaps were observed in all groups. conclusions: the photocuring technique and the type of resin composite had no influence on the internal adaptation of the material to the cavity walls. a positive effect was observed when the slow polymerization techniques were used.
Effect of microwave disinfection on physical and mechanical properties of acrylic resins
Consant, Rafael Leonardo Xediek;Vieira, Erica Brenoe;Mesquita, Marcelo Ferraz;Mendes, Wilson Batista;Arioli-Filho, Jo?o Neudenir;
Brazilian Dental Journal , 2008, DOI: 10.1590/S0103-64402008000400011
Abstract: this study evaluated the effect of microwave energy on the hardness, impact strength and flexural strength of the clássico, onda-cryl and qc-20 acrylic resins. aluminum die were embedded in metallic or plastic flasks with type iii dental stone, in accordance with the traditional packing technique. a mixing powder/liquid ratio was used according to the manufacturer's instructions. after polymerization in water batch at 74oc for 9 h, boiling water for 20 min or microwave energy at 900 w for 10 min, the specimens were deflasked after flask cooling at room temperature, and submitted to finishing. specimens non-disinfected and disinfected by microwave irradiation were submitted to hardness, impact and flexural strength tests. each specimen was immersed in distilled water and disinfected in a microwave oven calibrated to 650 w for 3 min. knoop hardness test was performed with 25 g load for 10 s, impact test was carried out using the charpy system with 40 kpcm, and 3-point bending test with a crosshead speed of 0.5 mm/min until fracture. data were submitted to statistical analysis by anova and tukey's test (?=0.05). disinfection by microwave energy decreased the hardness of clássico and onda-cryl acrylic resins, but no effect was observed on the impact and flexural strength of all tested resins.
Comparative study of frictional forces generated by NiTi archwire deformation in different orthodontic brackets: In vitro evaluation
Queiroz, Gilberto Vilanova;Ballester, Rafael Yagüe;De Paiva, Jo?o Batista;Rino Neto, José;Galon, Giselle Mara;
Dental Press Journal of Orthodontics , 2012, DOI: 10.1590/S2176-94512012000400012
Abstract: introduction: the purpose of this study was to compare the frictional forces between 0.014-in niti wires (aditek) with 4 mm horizontal deflection and brackets with different archwire ligation systems. methods: four types of self-ligating brackets (damon mx, easy clip, smart clip and in-ovation), a triple bracket (synergy) and a twin bracket with 8-shaped ligature (tecnident) were tested. twin brackets with conventional elastomeric ligatures (morelli) were used as control group. tests were repeated 10 times for each bracket/archwire combination. frictional forces were measured in an instron universal tensile machine at 3 mm/minute speed and a total displacement of 6 mm. statistical analysis comprised anova and dunnett's multiple comparison post hoc test. results: deflection-induced frictional (dif) forces increased in the following order: synergy, damon, 8-shaped ligature, easy clip, in-ovation, smart-clip and conventional ligatures. the differences among groups were significant, with the exception of the 8-shaped ligature groups which was equal to the damon and easy clip groups. conclusions: compared to conventional ligatures, all ligation systems tested reduced frictional forces. however, such reduction varied according to the ligation system employed.
Comparative study of classic friction among different archwire ligation systems
Queiroz, Gilberto Vilanova;Rino Neto, José;De Paiva, Jo?o Batista;Rossi, Jesualdo Luís;Ballester, Rafael Yagüe;
Dental Press Journal of Orthodontics , 2012, DOI: 10.1590/S2176-94512012000300015
Abstract: objective: to describe and compare three alternative methods for controlling classical friction: self-ligating brackets (slb), special brackets (sb) and special elastomeric ligatures (seb). methods: the study compared damon mx, smart clip, in-ovation and easy clip self-ligating bracket systems, the special synergy brackets and morelli's twin bracket with special 8-shaped elastomeric ligatures. new and used morelli brackets with new and used elastomeric ligatures were used as control. all brackets had 0.022 x 0.028-in slots. 0.014-in nickel-titanium and stainless steel 0.019 x 0.025-in wires were tied to first premolar steel brackets using each archwire ligation method and pulled by an instron machine at a speed of 0.5 mm/minute. prior to the mechanical tests the absence of binding in the device was ruled out. statistical analysis consisted of the kruskal-wallis test and multiple non-parametric analyses at a 1% significance level. results: when a 0.014-in archwire was employed, all ligation methods exhibited classical friction forces close to zero, except morelli brackets with new and old elastomeric ligatures, which displayed 64 and 44 centinewtons, respectively. when a 0.019 x 0.025-in archwire was employed, all ligation methods exhibited values close to zero, except the in-ovation brackets, which yielded 45 cn, and the morelli brackets with new and old elastomeric ligatures, which displayed 82 and 49 centinewtons, respectively. conclusions: damon mx, easy clip, smart clip, synergy bracket systems and 8-shaped ligatures proved to be equally effective alternatives for controlling classical friction using 0.014-in nickel-titanium archwires and 0.019 x 0.025-in steel archwires, while the in-ovation was efficient with 0.014-in archwires but with 0.019 x 0.025-in archwires it exhibited friction that was similar to conventional brackets with used elastomeric ligatures.
Resistência de genótipos de videira à ferrugem
Angelotti, Francislene;Scapin, Claudia Regina;Tessmann, Dauri José;Vida, Jo?o Batista;Vieira, Rafael Augusto;Souto, Eliezer Rodrigues de;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000900005
Abstract: the objective of this work was to evaluate the genetic resistance of grape genotypes to rust, caused by the fungus phakopsora euvitis, and the infection efficiency in relation to leaf age and inoculum concentration. the evaluation was carried out on 15 genotypes, based on the following resistance components: number of pustules (uredia) per cm2, size of pustules; number of urediniospores produced per pustules; and latent period. the resistance components, except for the latent period, presented considerable quantitative variation. the multivariate analysis of resistance components discriminated five groups of genotypes. the more resistant genotypes were the rootstocks cultivars iac313, iac572, and iac766, in which the infection efficiency was low, with small pustule sizes, and less urediniospores production, besides hypersensivity response on tissue surrounding the pustules. the infection increases with increasing of inoculum concentration. the rust colonizes young and mature grape leaves.
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