Materials Literature
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A frequency dependent resistance model for the representation of eddy current losses in the windings of three-phase, two or three windings, transformers is presented. It consists of a low order R, L Foster circuit connected in series with any existing transformer model to produce the realistic damping that results fro…
The influence of bicarbonate ions on the stability of copper oxides and pitting corrosion has been studied by the combined use of long term exposure, X-ray diffractometry (XRD), scanning electron microscopy (SEM), and atomic absorption spectroscopy (AAS). Contrary to earlier suggestions that the increasing concentrati…
Sulfiding corrosion induced by the action of consortia containing sulfate-reducing bacteria (SRB) in biofilms is a problem with most common engineering materials. It is now possible to use a model based on basic thermodynamic reasoning and information on complexation and alteration kinetics to make some predictions ab…
Sintered bodies of (Ba, Pb)2In2O5 were prepared by substituting A site of Ba2In2O5 having a brownmillerite-related structure with Pb. Crystal structure and conductivity of sintered (Ba, Pb)2In2O5 were investigated. The crystal structure of (Ba, Pb)2In2O5 was governed by the Pb content, and changed from orthorhombic to…
The step-polymerization reaction between monoamines and diepoxide has been investigated by measuring the permittivity and dielectric loss as a function of reaction time, tre, at different temperatures. Hexylamine and cyclohexylamine were used both in stoichiometric and non-stolichiometric (amine-rich) compositions wit…
The connection between cleanliness of semiconducting compounds and water tree growth at the semiconductor-dielectric interface was demonstrated. Changes to semiconducting compounds have improved the reliability of solid dielectric cables.>
We show that two types of fingers exist in homeotropic samples of cholesteric liquid crystals of positive dielectric anisotropy : fingers of a first species in which the director field is continuous, and fingers of a second species which are topologically singular and of the same nature as spherulites (also called cho…
Abstract Melt crystallization processes are in use as suspension or as solid layer processes. The purification efficiency of such melt crystallization processes can be improved by further purification steps such as sweating and washing. Here a mathematical description of experimental results which come from a solid la…
Solid-solution Sr2 –xLaxFeO4 crystallizing in the K2NiF4 structure has been obtained for 0 ⩽x⩽ 1. In the Sr-rich region, the K2NiF4 structure was stable only at low temperature. Heat treatment under an oxygen pressure of 100-500 atm was carried out to form oxygen stoichiometric samples. The structure was refined by th…
The reaction of (Bu4N)[V5O7(OMe)2(PhPO3)5] with aqueous HCl in methanol followed by treatment with diethyl ether yields dark brown crystals of (Bu4N)2[(V8O16){V4O4(H2O)12}(PhPO3)8Cl2]·2Et2O·2MeOH·4H2O 1, a mixed-valence VV–VIV cluster consisting of two (V4O8)4+ caps each bridged through four PhPO32– groups to a centra…
The σ-acetone complex [Fe(η5-C5Me5)(η2-dppe)(σ-OCMe2)]+ OSO2CF3–, (2 dppe = Ph2PCH2CH2PPh2) is cleanly synthesised by treatment of the hydride compound [Fe(η5-C5Me5)(η2-dppe)H]1 with MeOSO2CF3 in Et2O followed by crystallization from acetone–pentane; this compound, characterized by a single crystal X-ray diffraction,…
The influences of Mn of the recrystallization behavior and the formation of recrystallization texture in Ti-added ultralow-C steels were investigated and compared with that of low-C Al-killed steels. In Ti-added ultralow-C steels, Mn does not influence the recovery, the nucleation and growth rate of recrystallization,…
We calculate the continuous dependence of structure and shape of tangentially anchored nematic liquid-crystal microdroplets on the parameters of anchoring strength ${\mathit{w}}_{0}$ and radius r, at fixed temperature, using a numerical relaxation method and Landau--de Gennes theory. The structure is characterized by…
The chemistry of chromium in the passive film on sputter‐deposited chromium and thin films has been investigated in situ in an electrochemical cell under potential control by studying x‐ray absorption near edge structure. At high potentials, Cr in the alloys was oxidized to the 6‐valent state. Depending on the rate of…
The differential heats and the adsorption isotherms of water on α-Al2O3 have been measured at five different temperatures in the range 200–400 °C using a microcalorimetric–volumetric apparatus. The amounts of water adsorbed and integral heats decreased with increasing temperature. At all temperatures the differential…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(aryl prehnitimide)sZhi Yuan Wang and Yu QiCite this: Macromolecules 1994, 27, 2, 625–628Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs.org/doi/10.1021/ma00080a048https://doi.org/10.1…
New polyetherurethanes carrying fluoroalkyl substituents in the side chains were synthesized from N,N-di(hydroxyethyl)heptadecafluorooctyl-sulfonamide (a chain extender), 4,4'-disocyanatodiphenylmethane, and poly(tetramethylene glycol). Various kinds of polyetherurethanes having different tensile properties were prepa…
An overview of the present knowledge about the effect of ionizing radiation on properties of cholesteric liquid crystals is given. It includes the effects caused by either electromagnetic radiation or particles. Particular attention has been paid to the liquid-crystalline properties of cholesterol derivatives and thei…
The immobilisation of heteropolyacids into polyaniline films has been studied using the probe beam deflection technique, X-ray photoelectron spectroscopy and scanning electron microscopy. The results indicate that the heteropolyanions modify the redox behaviour and morphology of polyaniline.
β-Octasubstituted tetramesitylporphyrins have been prepared in good yields by Suzuki cross coupling of β-octabromotetramesitylporphyrin with aryl- and alkyl-boronic acids. A single-crystal X-ray analysis of -octamethyltetramesitylporphyrin 3a shows a saddled non-planar structure.