Materials Literature
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The corrosion resistance and microstructure of four highalumina and two chromia‐containing high‐alumina refractories were evaluated. Analysis of the refractories after exposure in the rotary slag test showed that the chromia‐containing products had better slag resistance than the chromia‐free products. Three factors c…
The reaction of ReCl 5 with a porphyrin H 2 (P) [2, 3] in refluxing trichlorobenzene represents a very efficient synthesis of oxorhenium(V) porphyrins ReO(P)X where X is a uninegative anion. Thus, rhenium is inserted to octaethylporphyrin and a variety of tetraarylporphyrins. The primary products are the paramagnetic…
Transition-metal bindíng (e.g. Cu(II)) to hydrous oxide surfaces (e.g.δ-Al<sub><sub>2</sub></sub>0<sub><sub>3</sub></sub>) is investigated in the presence of different classes of phosphates. The interactions between the Cu(II) ion and orthophosphate, pyrophosphate, tripolyphosphate, nitrilotris(methylene)triphosphonat…
The acoustic transients associated with optical cavitation in water have been studied using a high-speed interferometric technique. Radial pressure profiles of these spherical transients have been obtained over a range between 2 and 22 mm from the centre of the cavity. Pressure-radius relationships and transient energ…
Abstract 2‐Ethylhexylpoly(trimethylene 1,3‐phosphate) ( 3 ), poly(1,2‐glycerol phosphate) ( 1 ) and poly‐(1‐acetoxy‐2,3‐glycerol phosphate) ( 2 ) were synthesized and used as synthetic analogues of teichoic acids. Their properties as a carrier of magnesium and calcium ions were examined in the competitive exchange dif…
For several years the study of magnetic properties of quasicrystals was limited mostly to Mössbauer spectroscopy and susceptibility measurements on paramagnetic and spin-glass alloys primarily in the Al–Mn(–Si) system. A distribution of low-symmetry Mn sites appears to exist with only the larger sites (making up appro…
In order to investigate strain burst behavior of planar slip materials, single crystals of Cu-15.3at.%Al alloys, oriented for easy glide, were cyclically deformed under load and strain control. A huge strain burst (γp = 0.12) observed in a load-controlled fatigue test is related to easy-glide behavior after yielding.…
Ion chromatography and wavelength-dispersive X-ray spectroscopy methods for the quantification of ionic contaminants in XLPE cable insulation are reviewed. Cationic contaminants include sodium, potassium, calcium, aluminum, iron and silicon. Anionic impurities include chloride, sulfate, and nitrate. Concentrations of…
The desorption of CO from clean and sulfur-covered Ru(001) surfaces was studied using laser-induced thermal desorption (LITD) and temperature programmed desorption (TPD) techniques. CO was observed to desorb from clean Ru(001) with coverage-dependent kinetics. The isothermal desorption of CO was monitored with LITD me…
A numerical analysis of a four-electrode electron mirror is presented. It is shown that this system can have adjustable aberration coefficients, opposite to the aberrations of conventional electron optical systems. Therefore, it is possible to use such an electron mirror as an aberration corrector to further improve r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApparent absence of electronic instability in the one-dimensional metal sodium copper sulfide (Na3Cu4S4)Myung Hwan Whangbo and Enric CanadellCite this: Inorg. Chem. 1990, 29, 7, 1395–1397Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Publ…
It has recently been suggested that superoxide plays a role in the superconductivity of oxygen-enriched ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$. The x-ray photoelectron spectroscopy (XPS) identification of the superoxide is crucial in these arguments. In recent experiments we have deposite…
Results and analyses of long-term cantilever strength tests on composite line-post insulators are presented. The concept of the damage limit is developed. In service, composite line-post insulators are subjected to complex loading. Mathematical and experimental results show good agreement, allowing presentation of mul…
This paper reports the frictional properties of a series of siro spun yarns produced from cotton, polyester/cotton, and viscose. The coefficient of friction of the yarns has been measured using Howell's method where the two yams slide against each other at right angles. Yarn-to-metal friction has also been measured us…
A series of new liquid-crystalline compounds called imidazo [2,1-b]-1,3,4-thiadiazoles has been synthesized. The new compounds contain alkyl, aryl, trans-alkylcyclohexyl groups in positions 2,6 and lateral Br- and CN-substituents in position 5 of the heterocyclic fragment. The new mesogens normally have a wide mesopha…
Estimation des distances interatomiques, des silicates d'olivines cristallises dans Pbnm, par l'expression : D(calc) j =Σ s {W1j s Σ; [Xi s (Σ 2 m=1 I m ) i −1/2] }+Σ s W2j s Σ i (Xi s α i 71/4 )]+W3j; ou W1j s , W2j s et W3j sont des parametres adaptables faisant intervenir les occupations de site (Xi i ), les potent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxide films on iron and nickel ultrafine particles studied with zero point of charge measurementsHisaki Moriwaki, Yuzo Yoshikawa, and Tetsuo MorimotoCite this: Langmuir 1990, 6, 4, 847–850Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Pub…
Abstract Experimental evidence for the effect of starting compositions on the growth of CaWO4 crystals from Na2WO4 flux was given on the basis of the obtained solubility data. Crystal growth was conducted by heating mixtures at 1100°C for 5 h, followed by cooling to 500°C at a rate of 5°C h−1. Octahedral crystals up t…
The disproportionation of the complex (Et 2 N) 3 Ti(μ-PCy 2 )Ni(PPh 3 ) affords the coordinatively unsaturated species Ni(PPh 3 ) 3 , 1. This compound crystallizes in the triclinic space group [Formula: see text], with a = 18.483(4) Å, b = 16.203(3) Å, c = 17.783(4) Å, α = 105.85(2)°, β = 117.33(3)°, γ = 92.33(3)°, Z…
Incubation of adenylosuccinate synthetase from Escherichia coli with low concentrations of pyridoxal 5'-phosphate (PLP) resulted in a rapid loss of activity (92%), concomitant with the formation of a Schiff base. The inactivation of the enzyme by PLP is apparently first order with respect to PLP. The pseudo-first orde…