Materials Literature
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We investigate, for two water models displaying a liquid–liquid critical point, the relation between changes in dynamic and thermodynamic anomalies arising from the presence of the liquid–liquid critical point. We find a correlation between the dynamic crossover and the locus of specific heat maxima \documentclass[12p…
We show that post growth annealing of GaMnAs under As capping at temperatures in the range of 180-210 C leads to significant surface modifications. Depending on GaMnAs layer thickness and composition, we obtain either a smooth continuous reacted (MnAs) surface layer or 3D islands (quantum dots). The surface modificati…
Small‐angle X‐ray scattering (SAXS) and transmission electron microscopy (TEM) were used to probe the final morphology of linear and novel branched poly(ethylene terephthalate) (PET) samples having undergone shear‐induced crystallization. The branched PET samples were produced via a reactive extrusion process designed…
In this study, an analysis has been made of electrochemical noise (EN) signals of potential and current obtained on immersing samples of the Alloy AA5083 (UNS A95083) in solutions of sodium chloride (NaCl). These signals have been processed using the calculation of the Hurst exponent, a tool derived from the theory of…
We studied the voltage–dependent liquid crystal (LC) dynamic stability corresponding to the pixel edge shape in the fringe field switching (FFS) mode. LC dynamics is very unstable near the edge of the pixel slit, where there is a horizontally different field direction compared with the active region, particularly when…
There has been extensive research activity since the discovery of fatigue free La-doped Bi 4 Ti 3 O 12 films on Pt electrodes. These films show superior ferroelectric properties and require a lower deposition temperature than the previously discovered SrBi 2 Ta 2 O 9 . Substitution of Bi by lanthanide elements other t…
In this research, a new method is developed for grading various types of yarn for appearance using image analysis and an artificial neural network. The images of standard yarn boards were analyzed by image analysis and four different faults factors were defined and measured for each series of yarn counts. For each ser…
In the variable pressure scanning electron microscope (VP-SEM) the incident electrons pass through a gaseous environment and the beam is scattered by these interactions. We show here that the experimental intensity profile of the scattered beam can be described as Gaussian in form to a high level of accuracy. This pro…
Le présent travail concerne la détermination des propriétés mécaniques des âmes nids d'abeilles de forme hexagonale et de leurs versions sur-expansées rectangulaires. Ces âmes en papiers Nomex® sont présentes sur les voiliers multicoques de courses océaniques entièrement réalisés à partir de sandwichs à peaux de tissu…
The microspinning technology has generally been used for cotton in the case of small scale spinning test methods (50 gram fibres). One type of silk fibre waste -pierced cocoonprepared previously as short silk fibre with cut length of 35 mm is blended with cotton fibre to obtain further data concerning two blending tec…
The electronic structure and plastic properties are investigated for a number of alkali halide crystals (CsCl, CsBr, CsI). First-principles calculations are carried out within the Hartree-Fock and density-functional theory approximations using several variants of the exchange-correlation functional, including the hybr…
Based on typification in Ehrenberg's original material, the nomenclature and taxonomy of Gyrosigma fasciola (Ehrenberg) J.W. Griffith et Henfrey are discussed. This diatom is compared to two morphologically similar taxa, Gyrosigma sulcatum (Grunow in Cleve & Grunow) Frenguelli and Gyrosigma arcuatum (Donkin) Sterrenbu…
Three‐dimensional silica fiber reinforced silicon nitride‐based composites were fabricated at 873–1073 K in ammonia using polyhydriomethylsilazane and perhydropolysislazane, respectively. The composites showed high weight pickups during repeated pyrolysis cycles, non‐brittle failure behavior with fiber pull‐out in the…
Results of neutron diffraction studies of R 0.5 Sr 0.5 MnO 3 manganites (R = Sm, Nd 0.772 Tb 0.228 , and Nd 0.544 Tb 0.456 ) performed to reveal the microscopic origins of the giant oxygen isotope effect recently discovered in Sm 0.5 Sr 0.5 MnO 3 are presented. It is shown that two crystalline phases differing in the…
Abstract Interfacial reaction between Cu and Ti 2 SnC during the processing of Cu–Ti 2 SnC composite was investigated by using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. It is shown that the reaction is closely related to the reaction temperature, reaction time, and relative…
Este trabalho trata do efeito da hibridização do reforço, através da adição de uma carga mineral (bentonita) nanoparticulada, no desempenho mecânico de compósitos poliuretano/sisal contendo 25% em massa de fibras de sisal e moldados por compressão. As propriedades mecânicas, de tração e impacto, dos sistemas compósito…
The high-temperature characteristics of donor-doped SrTiO 3 /indium tin oxide (ITO) Schottky solar cells were investigated by current–voltage and impedance analyses at various oxygen partial pressures ( P O 2 ) (1–10 -4 bar) at 873 K. Both current–voltage and impedance characteristics showed a reversible oxygen partia…
The ferrimagnetic compounds Ca(Cu x Mn 3− x )Mn 4 O 12 of the double distorted perovskites AC 3 B 4 O 12 family exhibit a rapid increase of the ferromagnetic component in magnetization at partial substitution of square coordinated (Mn 3+ ) C for (Cu 2+ ) C . In the transport properties, this is seen as a change of the…
The grain microstructure evolution in the course of two dimensional (2D) grain growth is considered in greater detail, taking into account the influence of grain boundary triple junctions. It is shown that there are two limiting regimes of grain growth in polycrystals: the first one is associated with the situation wh…
The photoelectric properties of TlGa 1− x Yb x S 2 ( x = 0, 0.01) single crystals are investigated. It is established that partial substitution of ytterbium for gallium leads to (i) an increase in the electrical resistivity of the samples, (ii) a shift in the maximum of the intrinsic photocurrent toward the long-wavel…