Materials Literature
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RESUMO: Blendas de poli(tereftalato de butileno) (PBT) e copolímero ABS foram estudadas usando-se três tipos diferentes de ABS. As blendas foram caracterizadas mecanicamente através de ensaios de tração e de impacto, e termo-mecanicamente através da determinação da temperatura de deflexão térmica (HDT). Uma influência…
Constitutive equations for the relationship between stress, strain, strain rate, and temperature are an essential input for modelling thermomechanical processing. Hot plane strain compression testing was used to deform commercial purity aluminium, Al-1Mn, and Al-1Mg alloys at temperatures of 300, 400, and 500°C and eq…
To assess the effect of wind speed in practice, experiments were conducted under conditions of realistic wind velocities generated in the climatic chamber. The theoretical and experimental results were compared. In the theoretical model of forced convection between the human skin and the external environment the water…
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire H…
Blends of poly(etheretherketone) (PEEK) and poly(etherimide) (PEI) were prepared directly during the plasticization step of an injection-molding process. The phase behavior and mechanical properties of the blends at both 23° and 125°C were studied. On the basis of differential scanning calorimetry (DSC) and dynamic-me…
This article reviews the results of a test of the Gibbs-DiMarzio theory by Monte Carlo Simulation. The simulation employed the bond-fluctuation model on a simple cubic lattice. This model incorporates two kinds of interactions: the excluded volume interaction among all monomers of the melt and an internal energy of th…
EXAFS was used to study the local environment of Se, Pb and Mn impurity atoms in germanium telluride. It is found that the three impurity atoms do not occupy fixed on-center positions in GeTe and that the origin and magnitude of the displacements are different. It is shown that the rate of decrease of Tc when doping G…
Diamond thin films grown by the oxy-acetylene flame method have been investigated by x-ray absorption and Auger electron spectroscopies. The quality of the films, defined as the ratio of diamond to non-diamond carbon, has been determined by using both techniques, giving values as high as 95% for the sample grown with…
The magnetic properties of EuMnO3+x, Eu(Mn1—xCrx)O3, Eu1—xCaxMnO3 and Eu1—xSrxMnO3 were investigated. It is established that EuMnO3 is a weak ferromagnet with Néel temperature TN = 49 K. The increasing oxygen content leads to decreasing TN. The substitution of Eu by Ca and Sr causes a strong increase in magnetization…
There is continual debate over the central role of water in protein folding, structure, stability, and dynamics. Catalytic activity has been demonstrated in organic media with, apparently “anhydrous” enzymes. Hence there is considerable discussion over whether there are a few residual water molecules or if the enzymes…
Competition among generating facilities, including non-utility generators, and the presence of a utility`s own nuclear power plants, have caused more and more fossil-fired units designed for base-load operation to be converted to some type of cycling operation. Cycling, as used here, refers to operating modes that res…
Two dissimilar weldments between 9Cr-1Mo and 2.25Cr-1Mo ferritic steels have been characterized for their microstructural stability during various postweld heat treatments (PWHTs). The samples for the investigation were extracted from bead-on-plate weldments made by depositing 2.25Cr-1Mo weld metal on 9Cr-1Mo base pla…
The defocused beam (or broad beam) technique of bulk-compositional analysis has a bad reputation, and deservedly so. Many literature analyses based on DBA are grossly inaccurate, typically showing erroneously high Al, and low Fe, Mg and Ti. The only widely cited correction methods for DBA [1,2] are completely inadequa…
Single-crystal X-ray structures have been determined for the difluoro(porphyrinato)silicon(IV) complexes trans-(Por)SiF(2) (Por = the dianions of tetra-p-tolylporphyrin (TTP) and tetrakis(p-(trifluoromethyl)phenyl)porphyrin). Crystallographic data for (TTP)SiF(2).Et(2)O: monoclinic, space group C2/c, a = 30.228(4) Å,…
Sputtered gold films in a pure form or as nanocomposites in silica or silicon nitride were screened for surface-enhanced Raman scattering (SERS) activity using Rhodamine 6G as a probe. The films were prepared by sputtering pure gold or solidified Au–Si alloys in plasmas generated in a dc glow discharge apparatus. The…
Abstract The adhesive properties of a new family of crosslinkable aromatic copolyester resins are described in this paper. A unique method for forming an adhesive bond in the solid state through high temperature interchain transesterification reactions (ITR) between cured thin films of these copolyester thermosets is…
Abstract The influence of eolian dust deposition on the development of Red‐Yellow soils and nonallophanic Andisols in Japan has been well documented. In these studies, it was reported that the clay fractions of these soils are dominated by fine‐grained quartz, 2:1 layer silicates and their intergrades, and kaolinite.…
Studies have been performed on a series of La-modified lead zirconate titanate (PLZT) specimens with grain sizes between 0.6 and 6 μm by dielectric spectroscopy and transmission electron microscopy. These investigations have revealed an increase in the degree of relaxor characteristics with decreasing grain size for t…
Results are presented for high-pressure, isothermal studies of the low-frequency nonlinear dielectric effect (LF NDE) in the isotropic phase of n-octylcyanobiphenyl (8CB, isotropic-nematic liquid crystal phase transition) and n-dodecylcyanobiphenyl (12CB, isotropic--smectic-A phase transition). In both cases a linear…
Phonons in bcc Mo, Fe, and Cr have been calculated using embedded-atom-method (EAM)-type and embedded-defect (ED) potentials. The latter is an extension of the EAM that introduces angular interactions through a many-body approach. In contrast with the EAM formalism, the ED calculated elastic constants can be fitted to…