Materials Literature
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A model where low-frequency phonons and, above the mobility limit, “diffusive” modes migrating randomly from site to site transfer heat is proposed to describe the behavior of the isochoric thermal conductivity of molecular crystals in orientationally ordered phases. The mobility limit ω0 is found from the condition t…
Abstract Dumbbell specimens containing edge razor-cuts of various depths, c, have been prepared from sulfur-vulcanized natural rubber compositions containing 0–75 phr of N115 black. Normal tensile strengths ( c=0 ) of the gum and all black-filled samples are similar. However, cut growth resistance (CGR) relative to th…
This paper presents a method to obtain an electric model for transformers and inductors, including both frequency and geometry effects in the windings, which can be linked with existing core models. One-dimensional distributions for magnetic and electric fields are assumed, and from Maxwell's equations an equivalent e…
BACKGROUND: Doxorubicin can be loaded into preformed liposome by remote loading. Lyophilization of liposomes results in particle size increase and content leakage. Cryoprotectants have been used to improve the stability of liposomal formulations during lyophilization. Here we have developed a formulation kit for lipos…
A giant reversible growth (≥ 103 times) of the absorption of second harmonic radiation by optical poling of oxide glass was discovered. The observed absorption exerts an influence on the optical poling process and leads to a restriction of the maximum value of the photoinduced second harmonic generation in oxide glass…
An instrument was designed and assembled with the aim of measuring macroscopic properties of foams (such as foamability and stability) under high pressures and moderate temperatures (up to 105 bar and 425 K, respectively). The device makes use of infrared sensors to detect the foam forefront position as it is generate…
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…
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