Materials Literature
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This is the second paper reporting results of systematic studies of the nonstoichiometry and the cation tracer diffusion in quaternary oxide spinels comprised of Co, Fe, and Mn cations. In the first paper, point defects and cation tracer diffusion were discussed for compositions of the type (CoxFe2yMny)3−δO4 (x + 3y =…
Abstract The effect of pH and temperature of aqueous solution on hydration of MgO in a batch laboratory reactor was investigated. The experiments were carried out at the temperatures of 120 and 140 °C, pH of cool solution was changed from 10 to 13. It was found that even a small amount of added base substance influenc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of nitrogen base ligation on the rate of reaction of [5,10,15,20-tetrakis(2,6-dimethyl-3-sulfonatophenyl)porphinato]iron(III) hydrate with tert-BuOOH in aqueous solutionMichael J. Beck, Enona Gopinath, and Thomas C. BruiceCite this: J. Am. Chem. Soc. 1993, 115, 1,…
Tests carried out for HV and MV equipment are described. They have been designed to represent an equivalent stress level designed to represent an equivalent stress level borne over 25 years in a modern system and provide a good compromise between cost and representativeness. Twenty years of experience shows that the t…
The evolution of ferroelectric domain structure is considered as an example of kinetics of phase transformation process. Some analogies are revealed between crystal growth and domain kinetics in model uniaxial ferroelectrics. Within this approach the mechanisms of arising regular shaped, chaotic and fractal-type domai…
This paper reports on the solvatochromism of a new typical merocyanine dye of stilbazolium betaine. Solvatochromic absorption and fluorescence energy shifts of 2-(4-hydroxystyryl)-1-methylpyridinium betaine {4-[2-(1-methyl-2-pyridinio)vinyl]phenolate}, M, in 10 polar solvents are 15.0 and 6.0 kcal mol–1(1 cal = 4.184)…
A series of para-substituted aryldithiadiazolylium salts [p-XC6H4[graphic omitted]][Y](X = H, Me, CF3, MeO, MeS, NO2, F, Cl, Br, CN or [graphic omitted]+; Y = Cl or AsF6) and [p-XC6H4[graphic omitted]][AsF6](X = H, Me, CF3, MeO, MeS, NO2, F, Cl, Br or [graphic omitted]+) has been prepared. An electrochemical study of…
This paper describes the synthesis and mesomorphic behaviour of macrocyclics of 1-(4′-hydroxybiphenyl-4-yl)-2-(4-hydroxyphenyl)butane (TPB) with α,ω-dibromoalkanes containing 13 [TPB(c)13(z), where z defines the size of the macrocyclic, i. e., z= 1, monomer; z= 2, dimer, etc. ], 14 [TPB-(c)14(z)] and respectively 18 […
The electronic structures of crystalline lithium oxide and lithium sulfide have been theoretically investigated within the Hartree–Fock approximation. X-ray static structure factors are calculated and scattering factors of O2− and S2− ions are deduced following the theoretical model that uses standard scattering curve…
Titanium alloys for medical implants were casted using 5∼20 mass%Zr, 10∼20%Sn, 4∼8%Nb, 2∼4%Ta and 0∼0.2%Pd as alloying elements instead of using harmful Al and V.The alloys were forged in their α and α+β regions followed by annealing at 973 K for 7.2 ks. The annealed microstructures of the alloys consisted mainly of t…
To measure grain orientation in SEM with high accuracy a new EBSP calibration software is developed. Grain orientation determination is simply based on marking three zone axes in the live EBSP. The EBSP‐technique has been applied to study misorientation between subgrains in high purity and commercially pure aluminium.…
The synthesis of novel liquid-crystalline heteroaromatic compounds incorporating the five membered thiophene and furan rings is described. The objective of the present work is to substitute the mesogenic units styrylthiophene, styrylfuran, phenylthiophene and phenylfuran for the aromatic structural units styrylbenzene…
At moderate temperatures, the elastic properties of natural MgAl2O4 spinel differ in several significant ways from properties of synthetic spinels. Below 1000 K, the ultrasonic resonant frequencies of an ordered natural spinel change significantly after heat treatment; at higher temperatures, both types of spinels hav…
Abstract Thermal recovery of radiation defects and microstructural change in UO2 fuels irradiated under LWR conditions (burnup: 25 and 44 GWd/t) have been studied after annealing at temperature range of 450-1,800°C by X-ray diffractometry and transmission electron microscopy (TEM). The lattice parameter of as-irradiat…
Recent work on the development of liposomal magnetic resonance (MR) contrast agents has yielded structures with higher overall relaxivity than that of other nanoparticles of similar diameter. Liposomes incorporating membrane-bound complexes of manganase ("memsomes") produce greater hepatic enhancement per micromole of…
Ammonia plasma generated by electrical discharge at low pressure was employed for the surface modification of PTFE and ePTFE. A new chemistry at the plasma treated surfaces is reported. X-ray photoelectron spectroscopy studies showed the incorporation of C-N, C-O, C = O etc functional groups on the plasma treated surf…
The hydrogen-treated (at 623 and 773 K) Pt/TiO2–SiO2 catalyst was characterized by using Pt L-edge X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure (EXAFS), and electron paramagnetic resonance (EPR) spectroscopies to elucidate the role of the dispersed TiO2 in establishing the str…
Variable take-off angle and cold-stage ESCA measurements were utilized to analyze the surface composition of five polyurethane block copolymers. The polymers studied included a PTMO-polyurethane control, a carboxylated version of the control polyurethane, and three different peptide grafted (GRGESY, GRGDSY, and GRGDVY…
Previous work on fabric hand evaluation is reviewed. By using a multiple regression approach, four models, namely, a linear model, Webber-Fechner's law, Kawabata–Niwas's law and Stevens's law, for primary hand prediction have been compared. That results show that deviations from Stevens's law are much smaller than tho…
Abstract The uptake of water by nylon 6,6 [42DB Adipure (trade name of Dupont Canada Inc.)] at 100°C has been monitored by a combination of one‐dimensional proton NMR spectroscopy, relaxation time ( T 1 and T 2 ) measurements and proton microscopic NMR imaging techniques. The relaxation times of the water absorbed int…