Materials Literature
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Two experiments delineate the nature of the broad, weak, 3-eV absorption band in Al2O3: (1) anion self-implants clearly establish its association with aluminum vacancies, and (2) optical properties of this V-type center are exemplified after hole transfer from Ti+4 impurities. These properties confirm a previous theor…
Abstract— Novel UV‐curable liquid crystals showing nematic phases at room temperature have been developed. The liquid crystals can be utilized to create retardation films with high quality and good thermal stability. The properties of novel UV‐curable liquid crystals and the fabrication of various kinds of retardation…
Wires of Ti-51.14 at.%Ni have been either solution treated and subsequently aged at 520°C or only aged. Differential thermal analysis (DTA) has been used to characterise the macroscopic behaviour of the martensitic transformation and transmission electron microscopy (TEM) to study the microstructure. It has been found…
Abstract. Thermomechanical training was canied out on a newly developed Fe-20Mn-6Si-7Cr-1Cu shape memory alloy. It was observed that the effectiveness of thermomechanical training largely depends on the recovery annealing temperature and the pre-strain during training. Based on the analysis of the changes in critical…
Silicate and oxide matrix CMCs are being developed for application in advanced gas turbines. High-performance Silicate/Nicalon CMCs have been characterised mainly as materials for interface, process and mechanical modelling due to their limited thermal and oxidative stability. Saphikon (Al{sub 2}O{sub 3}) monofilament…
The crystal structures of Me k [Fe(CN) 6 ]; l ·mH 2 O where Me = Cu, Ni and Co, have been refined from X-ray (CuK a ) powder diffraction data by means of Rietveld analyses in space group . The Fe and Me ions are octahedrally coordinated by C and N atoms respectively, forming three-dimensional bimetallic networks with…
Luminescence of Mn2+ in A sites in natural and synthetic MgAl2O4 spinel has been studied. In the near perfect structure of the natural crystals the degenerate levels of the Mn2+ are splitted due to a symmetry lower than tetrahedral. In synthetic crystals the structure of the spectra is lost as a consequence of the sup…
Spectroscopic properties of Ce3+ ions in GdAlO3 crystal are presented. At least three Ce3+ nonequivalent centres (multisites) are present in this crystal. Energy transfer from the Ce3+ main in the UV emitting centres to the Ce3+ green emitting centres is observed. Ce3+ fluorescence decays are either fast (1.5–20 ns) o…
The synthesis of diamond has been accomplished from carbon disulfide (CS 2 ) in hydrogen (H 2 ) using tungsten hot filament chemical vapor deposition. A continuous layer was deposited on silicon and characterized using Raman spectroscopy, X‐ray diffraction (XRD), and scanning electron microscopy. The polycrystalline f…
The dispersive refractive index n(λ) and thickness d of chalcogenide glass thin films are usually calculated from measurements of both optical transmission and wavelength values. Many factors can influence the transmission values, leading to large errors in the values obtained for n(λ) and d. Anovel optical method is…
A new failure mode in ferroelectric, non-volatile memories in a radiation environment has been identified. Exposure to ionizing radiation in combination with a series of unipolar pulses, which could be found in a read-only or read-mostly memory application, has been found to create a preferred memory state in the ferr…
ISHS International Seminar on Soilless Culture Technology Protected Crops Mild Winter Climates GRANULOMETRIC ALTERATION, AIR-ENTRY POTENTIAL AND HYDRAULIC CONDUCTIVITY IN PERLITES USED IN SOILLESS CULTURES
Linear birefringence, Raman scattering, dielectric, and second-harmonic generation (SHG) studies on Sr1-xCax TiO3, x=0.007, reveal a smeared transition into a ferroelectric-improper ferroelastic phase at Tc=18 K. Polar disorder persists on a nanometric scale as a consequence of the percolative nature of the transition…
BaAl2Ge2O8-feldspar (BAGF) undergoes an order/disorder phase transition (C2/m⟷I2/c) with Ttr=1690 K. The kinetic behaviour and equilibrium properties of Al, Ge cation ordering within a tetrahedral framework have been studied by isothermal annealing experiments in the temperature range between 0.5 and 0.9 Ttr., The evo…
Corrosion has always been one of the major problems in oil refineries. Although crude oils consist predominantly of non-corrosive hydrocarbons, they contain varying amounts of potentially-corrosive impurities. In addition, refinery processes use chemicals known to be corrosive. In this article, corrosion problems in a…
A new multinary, single phase (carbo-)nitride ceramic with outstanding properties has been developed. The "single-source" precursor Cl3Si-NH-BCl2 reacts with alkylamines to form a precerameric polymer which can be a liquid or a fusible or infusible solid depending on reaction conditions. Polymer pyrolysis in ammonia o…
True 3‐D garment design (CAD) systems are fundamental for the next generation of intelligent textile and garment manufacture and retailing. Reports a new approach for modelling fabric. The fabric model is developed based on a physical analogue to a deep shell system for describing and predicting the real 3‐D shape of…
Nonlinear, quasi-static finite-element calculations are performed for multilayered, electrostrictive, ceramic actuators. Both a stand-alone device and an array of devices embedded in a 2-2 composite are studied. The numerical model is based on a fully coupled constitutive law for electrostriction which uses strain and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDelocalized Nitrogen Carbanions in SRN1 ReactionsM. Chahma, C. Combellas, and A. ThiebaultCite this: J. Org. Chem. 1995, 60, 24, 8015–8022Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published inissue 1 December 1995https://pubs.acs.…
Synopsis Factors affecting the cantilever bending of human hair have been investigated by theoretical structural mechanics in which the hair was treated as if it was of isotropic structure and internal mechanical property. Despite the simplicity of the model it is a valuable one for assessing the major geometric facto…