Materials Literature
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Al- and Mg-based alloys are being used for reducing the weight of automobiles. For structural applications, they must have adequate stress corrosion resistance, and yet, under some circumstances, stress corrosion cracking can occur in both alloy systems. Precipitation of the Mg-rich β-phase (Al3Mg2) at grain boundarie…
The problems of HVAC/DC gas insulated systems (GIS) dielectric strength coordination and support spacers design criteria are discussed in this paper. The most important challenge is to protect the spacers against flashover and consequently exclude them from consideration when coordinating an insulation of GIS. Both ex…
Der vollständige Katalysezyklus der CO-Oxidation mit N2O läuft an Ptn+ ab (siehe Schema); für Pt7+ besteht er aus sechs Elementarreaktionen. Durch schrittweise CO-Addition wird ein Vergiften des Katalysators ausgelöst. Das Ausmaß des Vergiftens kann über das Verhältnis der Partialdrücke von N2O und CO gesteuert werden.
The goal of this work was to study the viability of burnt biomass residue from a pulp and paper plant applied as a raw material for mortar used in the construction industry. The waste - bottom ash - was incorporated into the mortar as a mineral addition to the Portland cement. The effect of the waste's grain size on t…
The present paper addresses the relationship between the intrinsic factors, physical behaviour and durability of Miocene Age sandstone used to build Tunisian Heritage Monuments, and more specifically the Zaghouan-Carthage aqueduct. A petrography study (optical microscopy and mercury intrusion porosi metry) was conduct…
The aging behavior of 3‐mol%‐yttria‐stabilized tetragonal zirconia (3Y‐TZP) ceramics sintered in air and in reducing conditions was investigated at 140°C in water vapor. It was observed by X‐ray diffraction (XRD) that 3Y‐TZP samples sintered in reducing conditions exhibited significantly higher tetragonal‐to‐monoclini…
The complete catalytic cycle of CO oxidation with N2O is shown to occur on Ptn+ (see scheme); for Pt7+ it involves six different elementary reactions. Poisoning of the catalyst by sequential addition of CO is observed. The extent of poisoning can be adjusted with the ratio of N2O and CO partial pressures.
We report on an in situ observation of a cubic titanium dioxide polymorph. Experiments conducted on an anatase sample as starting material using a laser-heated diamond-anvil cell have shown that at a pressure of $48\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and temperatures between 1900 and $2100\phantom{\rule{0.3em}{0e…
Our work shows, through measurements on polypropylene films, the validity of surface potential measurements as a technique for dielectric properties analysis. We propose a representation of the decay and potential return curves that separates different components of dielectric response, by using tdv/dt vs log t plots.…
Abstract This article describes the fundamentals of titanium metallographic sample preparation. Representative micrographs are presented for each class of titanium alloys, including unalloyed titanium, alpha alloys, alpha-beta alloys, and beta titanium alloys. The article provides information on the macroexamination a…
Paramagnetic metals can induce T1 shortening by interaction with free water molecules. Two metal ions, Gadolinium and Manganese, are currently available for human use. Gadolinium-based MRI contrast agents (CAs) can operate using a approximately 100-fold lower concentration of Gadolinium ions in comparison to the neces…
The gelation of water suspension of a synthetic clay (Laponite) has been studied by dynamic light scattering in a wide range of clay weight concentration (C(w)=0.003-0.031). At variance with previous determination, indicating a stable liquid phase for C(w)<C(*)(w) approximately 0.015-0.018, we find that gelation actua…
PURPOSE: In order to develop a safe and effective systemically-administered biodegradable nanoparticle delivery system for solid tumors, the comparative biodistribution profiles of gelatin and poly(ethylene-glycol)(PEG)-modified (PEGylated) gelatin nanoparticles was examined in subcutaneous Lewis lung carcinoma (LLC)-…
Thermally sensitive poly(N-isopropylacrylamide) (PNIPAM) brushes grafted on SiO2-coated quartz crystal surface were prepared with a surface-immobilized initiator. Using quartz crystal microbalance (QCM), we investigated the collapse and swelling of the brushes in water in real time. Both frequency and dissipation of P…
The synthesis of chitosan and resulting chitosan composite films was carried out using glycerol, tween, and beeswax as additives to prepare the composites films, after which a complete study by FTIR was carried out for all the chitosan composite films. Several differences in the absorption bands were seen for each com…
The magnetic and transport properties of (GaMn)As are known to be influenced by postgrowth annealing, and it is generally accepted that these modifications are due to outdiffusion of Mn interstitials. We show that the annealing-induced modifications are strongly accelerated if the treatment is carried out under As cap…
We propose a new method to realize a conversion of photon qubit and spin qubit using the effective magnetic field created by the nuclear polarization known as Overhauser field. We discuss its preliminary experiment on InAlAs/AlGaAs self-assembled quantum dot and also discuss effects of excitons which could destroy the…
Theory of magneto-oscillation phenomena has been developed for two-dimensional electron systems with linear-in-k spin splitting. Both Dresselhaus and Rashba contributions are taken into account. It has been shown that the pattern of the magneto-oscillations depends drastically on the ratio between the above terms. The…
Neutron scattering measurements on a magnetoresistive manganite ${\mathrm{La}}_{0.75}{({\mathrm{Ca}}_{0.45}{\mathrm{Sr}}_{0.55})}_{0.25}{\mathrm{MnO}}_{3}$ show that uncorrelated dynamic polaronic latice distortions are present in both the orthorhombic $(O)$ and rhombohedral $(R)$ paramagnetic phases. The uncorrelated…
Thermal properties of graphitic ribbon are investigated based on Brenner's empirical potential. The reliability and usefulness of the empirical potential to address the thermal properties of covalent-bonded carbon nanostructures are verified through acomparison of phonon dispersion relations and the density of states…