Materials Literature
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This paper shows three different joining methods for fibre ceramic materials. The so called in-situ joining method is an integral part of the manufacturing process for CMC structures via the liquid silicon infiltration (LSI) process. Stiffening elements, local patches within attachment areas, inserts etc. are permanen…
La plupart des défaillances des systèmes nucléaires sont liées à des problèmes de matériaux. Cet ouvrage aborde les contraintes et sollicitations spécifiques que le nucléaire apporte aux matériaux utilisés dans cette industrie, qu'ils soient fonctionnels ou structurels.
A mixture of N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) and trimethylchlorosilane (TMCS) (99 : 1) is a highly sensitive derivatization reagent for carboxylic acid by gas chromatography/mass spectrometry (GC/MS), and Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) of poly(acrylic acid) (PAA) at 500 °C…
Melting behavior of nonisothermally crystallized samples of the neat isotactic polypropylene homopolymer (PP‐0) and the nanocomposite containing 4.68 wt% of organosilica (PP‐4.68) was studied in the temperature‐modulated differential scanning calorimetry (DSC) mode at three underlying heating rates and five modulation…
Preparation of ammonium polyphosphate form II was made by heating a mixture of ammonium orthophosphate and urea at 280 to 300°C under wet ammonia which was prepared by passing air through 3 to 5% ammonia water. Simple dry process of the preparation of ammonium polyphosphate form V was studied and the ammonium polyphos…
A vast majority of compounds exhibiting liquid crystalline phases have polar molecules. The nematic director is apolar, even when the molecules have cyano or nitro end-groups, as neighbouring molecules tend to have an antiparallel short-range order. This leads to a partial bilayer structure in the smectic A phase of r…
An improvement in the practical aspects of formamidine synthesis has resulted in the discovery of a class of compounds which produce organogels in protic solvents, presumably through intermolecular hydrogen bonding and pi-pi stacking interactions.
Study of the electronic state in α-Ga using Compton scattering technique is reported in this paper. The isotropic Compton profile has been measured using a γ-ray Compton spectrometer, which employs a 5 Ci annular 241 Am source. The measurement is compared with the available augmented plane-wave (APW) and non-local mod…
Electrically-driven, thin jets of liquids containing ionic surfactants are used to produce films consisting of randomly oriented ribbons with submicron thickness and hexagonal mesoporous structures.
We investigate the adsorption behavior of methyl orange (MO) on composite xerogels. Mesoporous TiO2-SiO2 and TiO2-SiO2-Al2O3 xerogels are prepared by hydrolysis of tetraethyl orthosilicate (TEOS), tetrabutyl orthotitanate (TBOT), and AlCl3 ·6H2O using HCl as a catalyst and cetyltrimethylammonium bromide (CTAB) as a te…
Microwave sintering route was used for obtaining minimum chemical reactivity between the two phases (for sharp grain boundaries) and controlled microstructure in the composites of Ba1 − xSrxTiO3 (BST) and MgO. Composites of desirable compositions of ferroelectric BST and non-ferroelectric MgO were microwave sintered a…
We have investigated the behavior of a cholesteric mixture, consisting of the negative dielectric anisotropy liquid crystal MBBA and a chiral dopant S811(1%b.w.). In the phase diagram a.c. applied voltage versus confinement ratio, in addition to the transition previously observed, before reaching the domain of the tra…
Effects of fluids on material removal rate, chipping damage, and surface roughness in the simulated clinical‐dental machining of a dental‐type glass ceramic were investigated. Significant differences in removal rate were obtained among the fluids investigated, but only a 4 wt% boric acid solution gave a higher removal…
Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) surfaces were exposed to vacuum UV (VUV) photo-oxidation downstream from Ar microwave plasma. The modified surfaces showed the following: (1) an improvement in wettability as observed by water contact angle measurements; (2) surface roughening; (3) defluorination…
In recent years, significant progress in understanding device physics and in identifying potential applications of carbon nanotube electronic devices has occurred. In a nanotube, low bias transport can be nearly ballistic across distances of several hundred nanometers. Deposition of high-K gate insulators does not deg…
The combination of hysteresis and permanent-magnet materials in the rotor of a self-starting synchronous motor makes the motor analysis very difficult due to its inherent nonlinearity. This paper presents the simulation results of the transient performance of permanent magnet hysteresis synchronous (PMHS) motors. The…
This comprehensive and authoritative volume to decommissioning of nuclear facilities will serve as a complete introduction to those new to the field, as well as an up-to-date desk reference on regulations and resources for experienced practitioners. The handbook will provide a forum building a network of consistent ap…
Standard mixtures of amorphous material (volcanic glass) and crystalline phase (equally participated montmorillonite, muscovite, heulandite, quartz, and calcite) were prepared at the following weight proportions after weighting: 100-0, 75-25, 50-50, 25-75 and 0-100, respectively. From their XRD patterns and using two…
The effects of vacancy depletion and solute atom depletion on the microstructural evolution of the precipitation-free zone (PFZ) near the grain boundary have been examined by Monte Carlo simulations with Kawasaki dynamics. The solute depletion caused by a precipitation of stable phase at grain boundaries lead to a wel…
Upon the commencement of the analytical effort to characterize the impact dynamics and damage of the Space Shuttle Columbia leading edge due to External Tank insulating foam, the necessity of creating analytical descriptions of these materials became evident. To that end, material models were developed of the leading…