[PDF] Top 20 Mat. Res. vol.8 número3

... The financial support from Departamento de Engenharia de Materiais, Universidade Federal de São Carlos - DEMa/UFSCar for mailing expenses; from Laboratório de Materiais Vítreos [r] ... See full document

... These centers have absorption bands in the near UV region with extension in the visible region, turning the quartz successively greenish, yel- lowish, and brownish as the irradiation d[r] ... See full document

... The Eu (III) emission disappear, when heated at 1000 °C, probably due to phase transition anatase to rutile and migrations of ions to the external surface that was proved by x-ray diff[r] ... See full document

... Similarly, compressive strength values of glass iber reinforced composite are higher in the range of 27.5 to 45.4%, while carbon iber reinforced epoxy polymer concretes showed even mor[r] ... See full document

... Figure 8, taken from Liebmam’s doctoral thesis pre- sented in the 50’s, shows that migration velocity varies considerably with the misorientation angle θ (difference in orientation between two ... See full document

... gin H 3 XM 12 O 40 and Wells-Dawson H 8 X 2 M 18 O 62 type compounds, are solid superacids since their acid strength is greater than that of 100% H 2 SO 4 . Therefore, many heteropolyacids are more active ... See full document

... The start solution was prepared from an aqueous solution of Fe and Ag nitrates and nitric acid. The precursor powder obtained was reduced in a hydrogen atmosphere for 45 minutes at a temperature of 400 °C. The resultant ... See full document

... Figure 4 shows a comparison between the values calculated using the theoretical expression, Equations 9 or 18, obtained from a single grain, for the average curvature of the interface [r] ... See full document

... The absorption of moisture accelerated by temperature used in the hygrothermal conditioning weakens the iber/matrix interface exposing the carbon ibers.. Chateauminois A, Vicent [r] ... See full document

... The model estimated by Equation 4 indicates that the compaction rate of particleboards depends in a statistically signiicant way on the variables of modulus of rupture in static bendin[r] ... See full document

... Optical and scanning electron micrographs were obtained after transversal cuts (Figure 1) followed by chemical etching with Kroll’s reagent (92 ml distilled water, 6 ml nitric acid, 2 ml fluoridric acid). Vicker’s ... See full document

... However, austenitic stainless steels with relatively low stacking fault energies soften by dynamic recrystallization after some degree of strain. This threshold strain is known as the critical strain and cor- responds to ... See full document

... The purpose of this work is to study the influence of the heat treatment of stoichiometric mixtures of DGEBA/DDM and DGEBA/ DDS through intrinsic and extrinsic fluorescence [r] ... See full document

... slightly from theoretical cutoff wavelength, calculated from the core diameter and refractive index profile. Chromatic dispersion factor is mainly applied for modern high bit rate transoceanic, terrestrial and ... See full document

... The hydrogen desorption kinetics can be determined by controlled heating of TiH 2 in the powdered form in vacuum. XRD is a simple and versatile technique, which allows the observation[r] ... See full document

... Among the three methods presented, analysis by Debye peak- based itting was the most precise, because the inluence of the relaxation process due to nitrogen cannot be discarded by the two other methods, frequency ... See full document

... Therefore, a logarithmic conversion of both S and N data is performed to check if the assumptions of equal variance and nor- mality are obtained. As seen in Figure 7, the variance is constant. In Figure 8, the ... See full document

... The purpose of this work was to investigate the effect of silica fume and acrylic polymer together on the adhesive properties of mortars employed to install porcelain stonewar[r] ... See full document

... The heat treatment proceeded showed that the surface crystallin- ity was recovered but the microtopography of the machined surface undergone an expansion. This is might be an expected result since that contrary was the ... See full document

... In fact, it was not observed a significant influence on the mechanical properties of the composites with 1% of silica in respect to the neat recycled EVA.. However, for the [r] ... See full document