[PDF] Top 20 Mat. Res. vol.4 número1

... Os organizadores do 14° CBECIMAT confirmaram o repasse à MR do eventual saldo (o balanço ainda não foi fechado) e de encaminhar pedido a Fapesp para financiar os trabalhos apresentados p[r] ... See full document

... The increment in the damping observed by the linear loss area of PU soft segment at higher concentration of PA in the SIN’s can be attributed to a higher cohesiveness reached by SIN’s wh[r] ... See full document

... American Dental Association 8 recommends that the in- crease in weight of the polymer shall not exceed 0.8 mg/cm 2 of the surface after immersion in water for seven days at 37 ± 1 °C. Cury 9 observed that the mean water ... See full document

... DSC curves for annealing at 2 K/min showed three peaks, the first one being the most intense, suggesting a crystallization process with three well resolved exothermal reactions. For annealing at 5 K/min, however, only ... See full document

... tion, where occurs the lowering of the crystal symmetry from the tetragonal I42d phase to the orthorhombic Fdd2 phase. As a result the crystal lattice becomes polarized along the c-axis. Several works reporting the ... See full document

... Films were immersed in glass tubes containing phos- phate buffer solution (pH = 7.4), for specific periods (1, 4, 8, 12, 16, 24, 36 and 53 weeks). After each period of degradation, the samples were removed, washed ... See full document

... chopping frequency. These parameters are determined by a numerical least-squares fitting procedure. In Fig. 3 we show the rear-PA intensity as a function of the chopping frequency f for the PS sample. It is shown that ... See full document

... Distributing SiC whiskers uniformly in the ceramic matrixes is not an easy task. However, when it is done, the potential benefit of the whisker reinforcement is possible to achieve 31 . Considering the homogeneous nature ... See full document

... material de alúmina, utilizando valores de las tensiones de origen térmico obtenidos por cálculo numérico. Se incluye el análisis de la fractura en ambas solicitaciones. Los en- sayos em[r] ... See full document

... Ideal biocompatible polymers must show a mimetic superstructure with biological supra-organi- zation. Collagen-rich structures like tendons and ligaments are materials with various levels of order, from molecules to ... See full document

... condensation rate. At pH ~ 4, the solubility of silica and the dissolution rate are quite low. Therefore, an effect of for- mamide additions may be to strengthen the gel by maximiz- ing the extent of condensation ... See full document

... etc. Res ta um; o fa tor de im pac to (FI), ou seja, a ra zão en tre o nú me ro de ci ta ções de ar ti gos pu bli ca dos na re vis ta e o nú - me ro de ar ti gos pu bli ca dos na mes ma, de acor do com a se ... See full document

... Titanium nitride films usually have low friction coeffi- cient, high hardness, are high temperature resistant, and adhere well to several substrates 4 . Besides that, cutting tools deposited with those films show ... See full document

... For the electrical measurements, gold electrodes, each with a nominal area of 7.07x10 -4 cm 2 , were sputter-depos- ited on the top surface in a metal-ferroelectric-metal (MFM) configuration. Capacitance and ... See full document

... It is worth noting, however, that, in the same range of temperatures, the increase in the slope of peak stress vs. 1/T curve is not observed in Fig. 4. In this case, straining was carried out after cooling from ... See full document

... The effect of the introduction of a true plastic strain associated to tests II (Fig.7b) on the strains, variation of ER and thermal properties has been demonstrated by Figs. 4, 5, 6 and 7. In fact, this plastic ... See full document

... where A(T) is a temperature dependent factor, t is the time after removal of the externally applied electric field and n ≈ 0.6 for this sample showing that space charge polarisation is not a dominant effect 11 . Similar ... See full document

... increments ∆P, which is inversely proportional to pore size. Thus, small pore sizes, typical of gels obtained in acid medium (r ~ 1-10 nm) generate considerable ∆P (about 4-15 MPa) 11 . Differences between local ... See full document

... Composite materials formed by an insulating matrix and metallic particles have attracted much attention due to a singular combination of properties, including mechani- cal 1 , electrical 2 and magnetic 3 . Such ... See full document

... In the last five decades, defect structure analysis of polycrystalline materials by X-ray powder diffraction tech- nique has been able to cover a number of lattice imperfec- tions. They are often called size-strain ... See full document