Materials Literature
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By using a thin slab casting simulator combined with the hot deformation simulator WUMSI, laboratory tests were performed to investigate the microstructure processes and mechanical properties in the process of thin slab direct rolling (TSDR). The paper shows the possibilities to improve the initial as‐cast state of mi…
The use of in situ Fourier Transform Infrared (FTIR) to follow PU reaction kinetics has been studied using a heated probe matching the PU material temperature. The results obtained show that, although not giving access to concentration of formed chemical bonds, the technique is a unique tool to assess subtle differenc…
Charge transfer near the threshold of polymer film transition (induced by a low uniaxial pressure) to the high-conductivity state is studied in an attempt to tackle the question of how the energy band structure of a wide-gap organic insulator varies near this threshold. The I-V characteristics of poly(diphenylenephtha…
An alternative method for the hardening of steel parts has been developed as a means of providing steel products with superior mechanical properties through development of high residual compressive stresses on the part surface, and involves the application of intensive quenching during heat treatment. This processing…
In this work, we describe a process for the fabrication of suspended porous silicon micro-hotplates for application in thermal sensors. Membrane release is achieved by means of lateral isotropic etching of the bulk silicon substrate, the etching being highly selective to the porous silicon and the photoresist used to…
Adsorption isotherms of He-4 on Na and on Rb measured with a quartz crystal microbalance are presented. The isotherms on Na indicate complete wetting at coexistence and the growth of a thin film at low relative pressures, which may become superfluid at lower temperatures. The results on Rb indicate clear prewetting ju…
One of the most fundamental phenomena in optics is refraction. When a beam of light crosses the interface between two different materials, its path is altered depending on the difference in the refractive indices of the materials. The greater the difference, the greater the refraction of the beam. For all known natura…
Abstract The ignition, flaming and smoldering combustion of low‐density polyimide foam have been studied using a cone calorimeter. Low‐density polyimide foam exhibits a high ignition resistance. The minimum heat flux for the ignition of flaming combustion ranges from 48 to 54 kW/m 2 . This minimum heat flux also indic…
Abstract X-ray single crystal, X-ray powder and specific heat investigations were carried out on alumosilicate NaNO 3 -sodalite between 290 K and 1100 K. Single crystal structure determinations at 295 K, 505 K and 720 K reveal the sodalite structure in its partially collapsed form in space group P 4̅3 n whereas at 935…
Stacking faults and grain boundaries of Ti 3 SiC 2 have been investigated by means of high-resolution electron microscopy. The stacking faults were found to result from insertion of additional TiC layers, instead of dissociation of dislocations conventionally observed in other materials. The stacking faults with many…
A numerical approach for the evaluation of hysteresis loops in the harmonic regime is presented. Genetic algorithms (GAs) are used to train neural networks (NNs) with the aim of generalizing the Jiles-Atherton (JA) static hysteresis model for dynamic loops. The NN training is based on symmetrical and asymmetrical, maj…
Adsorption of solid particles to a fluid/fluid interface can reduce the total interfacial energy of a system of three fluid bulk phases in such a way that the particles induce the wetting of a fluid/fluid interface by a liquid, which does not wet this interface in the absence of particles. This particle-assisted wetti…
Abstract Poly(methyl‐ co ‐trifluoropropyl)silsesquioxanes (P(M‐ co ‐TFP)SSQs) were prepared using methyltrimethoxysilane (MTMS) and trifluoropropyltrimethoxysilane (TFPTMS). The molecular weight, microstructure of the copolymers and properties of their thin films have been changed by adjusting reaction parameters such…
The physical properties of rock wool fiber-polystyrene composites have been studied as a function of temperature, frequency, filler content and morphological aspects. The glass transition temperature, mechanical properties, dielectric constant and morphology showed dependence on the rock fibers' concentration. The phy…
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…