Influência da incorporação de nanofibras de poliamida 6 com e sem nanotubos de carbono como reforço de prótese parcial fixa adesiva

The aim of this study was to evaluate the behavior of reinforced composites with polyamide 6 fibers aligned (6000 rpm) and alignment (120 rpm) with or without CNT using the flexural strength test. After preparation of nanofibers aligned nylon 6 (6000 rpm) and alignment (120 rpm) with and without incorporation of nanotube carbon by the method of electrospinning, were performed one control group (n = 10) and 4 experimental groups (n = 40) G1: Control (just resin Charisma - Heraeus Kulzer) ;G2 Resin + N6 aligned (6000 rpm) + CNT; G3:Resin + N6 alignment (120 rpm) + CNT; G4: Resin + aligned ( 6000 rpm) N6. G5: Resin + N6 alignment (120 rpm). The fibers were cut to the dimensions of 0,3 x 15 mm and were applied an adhesive at the surface (Single Bond 2) for 5 min and cured. In the matrix, was added resin in the proximal box (Charisma A2, Heraeus Kulzer) and cured for 40 s. (power 1100 mW / cm²). A first layer of resin and on the resin was deposited. The resin layers specimens were light irradiated with three overlapping exposures delivered. For each resin layer were light irradiated for 40 sec. The samples were tested with a cross-speed of 1 mm / min, and a 50 Kgf at Universal testing machine (EMIC mod.DL2000). The Dunnet test showed that only the nanotube group was significantly different from the control group. The ANOVA two-way indicates that the nanotube factor was statistically significant (p < 0.05) and there is no interaction between factors and orientation nanotube. The presence of nanotube showed lower fracture resistance values for aligned and unaligned groups. The results of this study showed that the orientation of the fibers does not influence the strength of composite resins and the incorporation of nylon nanofibers with carbon nanotubes decreased the fracture resistance values. The presence of the fibers has not been able to improve the strength of the material in any of the...

As lógicas espaciais do sistema bancário: reestruturação das cidades de Marília, Ribeirão Preto e São Carlos

Esa tesis presenta un breve histórico sobre el sistema bancario brasileño, buscando entender las lógicas espaciales en tres ciudades paulistas - Marília, Ribeirão Preto y São Carlos - asociando el abordaje, sobretodo, al contexto de las ciudades intermedias, que es el caso de las las ciudades estudiadas en esta investigación. Realizamos este análisis a través del trabajo con algunas hipótesis sobre lógicas espaciales, refuerzo de la centralidad urbana y nuevas tendencias, con el fin de comprender posibles prácticas espaciales resultantes de reestruturacción urbana y de la ciudad, tomando en consideración que la fuerte presencia de distintas agencias, junto a los espacios comerciales de las ciudades, confirma la importancia comercial que estas ciudades tienen, revelando relaciones entre su ubicación y las posibilidades de atraer usuarios. Por lo tanto, el estudio de las lógicas espaciales ejecutadas por los grandes grupos que operan el sistema bancario ha tenido papel importante en la articulación entre reestruturación urbana y de las ciudades