Materials Literature
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Li-H-rich zincostaurolite locally formed at a metabauxite-marble contact along the eastern coast of Samos during early Alpine high-P, low-T metamorphism. The staurolite, which probably grew from gahnite, cookeite, kaolinite/pyrophyllite, diaspore, and minor Fe-oxide, occurs as prismatic crystals (up to several mm long…
The energetics of the Saint Claire dickite sample, a highly pure and low defect material, have been studied by high-temperature oxide-melt solution calorimetry. Data were corrected for adsorbed water, the only significant impurity to the ideal formula Al 2 Si 2 O 5 (OH) 4 . Enthalpies of dickite dissolution into molte…
A method able to generalize the static Preisach hysteresis model for dynamic loops under sinusoidal time-varying fields is presented in this paper. The aim is to obtain an equivalent static model for dynamic loops. Then, the Preisach distribution function parameters are updated according to the frequency of the excita…
Abstract A simulation model computer program, which accounts for not only the diffusion process inside the polymer but also partitioning of the contaminant between the polymer and the contacting phase, was developed based on a numerical treatment, the finite element method, to quantify migration through multilayer str…
Abstract The present paper describes the development of a new processing technology: rotational moulding of natural fibre reinforced thermoplastics. Different polymer-natural fibre and polymer-flour systems have been characterised. A rotomoulding grade of high density polyethylene has been used as the polymer matrix f…
Liquid chemical products are marketed by a number of companies for stabilizing pavement base and subgrade soils. If effective, these products could be used as alternatives for treating sulfate-rich soils, which are susceptible to excessive heaving when treated with traditional, calcium-based stabilizers like lime, cem…
The rubbing of polymer-coated substrates is one of the most frequently used techniques for liquid crystal alignment. However, the aligning mechanisms are not completely understood. The influence of friction charges induced by the rubbing process has been taken into account in theoretical publications. In this work we…
Nanophase synthesis of ferroelectric thin-films of Ba0.6Sr0.4TiO3 (BSTO) was studied systematically for applications in tunable microwave components. Synthesis of nanostructured BSTO was performed using a pulsed-laser deposition system with real-time in-situ process control. The main research goal was to utilize the p…
The structural evolution in NiTi shape memory alloys subjected to pseudoelastic cycling is examined in the present study. Single crystals with [100] and [111] orientations were subjected to repeated compressive cycles and then studied by transmission electron microscopy (TEM). TEM observations were made at cycle numbe…
Abstract HgI 2 crystallizes under ambient conditions from various solvents and by sublimation into three concomitant polymorphs whose colors are red, orange, and yellow. The orange and yellow phases are metastable and transform into the red phase when touched. A phase transition from red to yellow occurs at 400 K. The…
Abstract A theoretical model is presented to describe the diffusion-limited thermal oxidation of stabilized elastomers, with no assumptions concerning the concentration of oxygen, the kinetic chain length, the ratio of termination rate constants, or the existence of a steady state for oxidation products. Model predict…
The stop and play models are applied to the representation of the hysteretic characteristics of a silicon steel sheet. Both models are used to provide hysteretic functions from B to H. The play model identified from symmetric B-H loops describes the hysteretic characteristics much more accurately than does the stop mo…
In the present paper the peculiarities of conductivity of porous silicon are studied. For the first time an attempt is made to describe analytically the dependence of porous silicon conductivity on material porosity. It is found that the conductivity is mainly crystalline for porosities much lower than the percolation…
No abstract available.
Ultrafast electron dynamics are compared for small (2.5- to 4.0-nm average diameter) Au nanoparticles in two different surrounding environments. In one case, an aqueous solution contains Au nanoparticles (with average diameters of either 2.5 or 4.0 nm) embedded inside polyamidoamine (PAMAM) dendrimers. In the other ca…
We purified a geranylgeranylglyceryl phosphate (GGGP) synthase from Thermoplasma acidophilum by several steps of chromatography. Based on the proteinase-fragment-mass-pattern analysis of the SDS-PAGE band of the partially purified protein, the DNA sequence encoding the protein was identified from the whole genome sequ…
Slow crack growth in a model of homogeneous brittle elastic material is described as a thermal activation process where stress fluctuations allow to overcome a breaking threshold through a series of irreversible steps. We study the case of a single crack in a flat sheet for which analytical predictions can be made, an…
In this paper, cotton fibers and their fabric are treated with butanetetracarboxylic acid (BTCA) with the catalyst sodium hypophosfite (SHP) at different concentrations of treating agent and different curing temperatures. Results show that low curing temperatures and low agent concentrations have a slight effect on th…
Piezoelectric ZnO thin films have been successfully used for multilayer surface acoustic wave (SAW) and bulk acoustic wave (BAW) devices. Magnesium zinc oxide (Mg/sub x/Zn/sub 1-x/O) is a new piezoelectric material, which is formed by alloying ZnO and MgO. Mg/sub x/Zn/sub 1-x/O allows for flexibility in thin film SAW…
Original material of Ehrenberg's from Santa Fiora (Tuscany, Italy) was examined to establish the identity of the diatom to which Ehrenberg gave the name Gaillonella italica. It was compared with other Ehrenberg material, notably from New England, and with numerous other samples, both fossil and recent, with a view to…