Materials Literature
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Three kinds of mordenite were examined for the adsorptive separation and removal of trace amounts of 14 CO 2 and moist NO x contained in the off-gases of reprocessing plants for spent nuclear fuels. It was found that protonation of mordenite eliminated any possible removal of CO 2 by specific adsorption but induced th…
The relationship between the interatomic distances and crystal dimensions in dispersed carbon is studied by x-ray structure analysis and by performing model calculations. It is established that the interatomic distances in dispersed carbon are determined by the dimensions of the crystals along the crystallographic a a…
Abstract A systematic study for the effect of axially coordinated monovalent anions on the electrode reactions of several manganese porphyrins in acetonitrile is presented. Potential shifts of the metal‐centered reduction with changes in counterion were related to the degree of Mn(III)‐counterion interaction. In the e…
We report x-ray photoemission spectra for a poly(oxymethylene) (POM) polymer (also known as acetal). XPS spectra were acquired with a SSI model SSX-100 instrument using monochromated Al Kα x-rays. We present the survey spectrum (binding energy 0–1000 eV) and a narrow spectrum of the C 1s and O 1s photoelectron peaks.
RATIONALE AND OBJECTIVES: The neurologic pathologies for which contrast-enhanced MRI is indicated are often accompanied by a disruption of the blood-brain barrier (BBB), which allows the contrast agent to come into contact with the nervous tissue. Thus, assessment of the neurologic safety for a new contrast agent is o…
Abstract Blends of commercial bisphenol‐ A ‐polycarbonate and styrene‐acrylonitrile copolymers were prepared by precipitation in ethanol from the solution in methylene chloride in order to eliminate the low molecular weight substances contained in the commercial polymers, specially the oligomers contained in commercia…
Abstract Temperature change can build up tensile stresses into thermoplastic materials, if their thermal expansion is hindered. This paper describes how to calculate those stresses. Because thermoplastic materials are time dependent with respect to temperature and strain, a nonlinear viscoelastic material model is nec…
A polycrystal sample of Fe-bearing prismatic sillimanite was annealed experimentally at T= 1675°C and P = 20 kbar for 12 min. ATEM investigation of the sample reveals that the starting material partly transformed into mullite during the annealing, and that this process was assisted by partial melting. The exsolved par…
Steel toughness has been greatly improved in the last two decades by adopting innovative technologies such as advanced steelmaking, grain refinement and thermo-mechanical treatment. The technology of oxide metallurgy is not a simple part of either chemical metallurgy or physical metallurgy. It aims at the generation o…
Heavy metal accumulation in soil due to the application of sewage sludge may induce changes in its ionic retention capacity. In this work, sludge application effects on copper (Cu) and zinc (Zn) adsorption by the surface horizon of a calcareous soil in Southern Spain have been studied. Sludge from the urban waste wate…
Films of amorphous hydrogenized carbon (a-C:H) are prepared by chemical vapor deposition using a dc glow discharge. The absorption is studied over wavelengths of 400–2400 nm. Two Gaussian-like bands are identified with peaks at ∼600 and ∼800 nm. The ratio of the integrated intensities of these bands (I 600/I 800) is f…
The effect of palm oil fatty acid on curing behaviour and mechanical properties of epoxidized natural rubber (ENR 25 and ENR 50) and one grade of unmodified natural rubber (SMR L) was investigated in the concentration range of 0 to 7.0 phr. Results indicate that scorch and cure times increase with palm oil fatty acid…
The flux growth method, with Na2B407 as flux, was successfully used to produce high-quality single crystals of spinel with composi tions corresponding to solid solutions of spinel s.s. (MgAl204) -magnesioferrite (MgFe3+204) and spinel s.s. -hercynite (Fe2+ Al204). Some interme diate terms of spinel s.s. -gahnite (Zn…
Beryllium has found applications in the nuclear industry as components in weapons and nuclear reactors, in the aerospace industry for special structural applications and in precision navigational instruments such as gyroscopes. The purity of the beryllium is known to have a large impact on its mechanical and chemical…
The pollution on the surface of an insulator is asymmetric, although insulators, in general, are axisymmetric. The distortion of fields on the surface of an asymmetrically polluted axisymmetric insulator is computed in this paper. The surface charge simulation method (SCSM) has been used with cylindrical, conical and…
Pemulens(R) (BF Goodrich) are hydrophobically-modified copolymers of acrylic acid (Acrylates/C10-C30 alkyl acrylates) that could act both as primary emulsifiers for o/w emulsions and viscosity enhancing agents. The aim of this study was to assess the influence of different processing conditions (mixing equipment, spee…
The thermodynamic properties and lattice dynamics of crystals MM′P2X6 with cations in different valence states have been investigated. For Sn2P2S(Se)6 crystals with a three-dimensional lattice, the interaction between polarization and deformation plays an important role in the mechanisms of the displacive transitions…
Abstract Transient shear and extensional properties of two grades of partially crystalline biodegradable aliphatic polyesters, poly ε caprolactone (PCL), were investigated at three different temperatures. Uniaxial extensional viscosity at a constant strain rate was obtained using the Meissner apparatus. The magnitudes…
The thermoelectric transfer difference of Thermal Converters (TCs) can be evaluated in both current mode and voltage mode, using a fast-reversed dc (FRDC) source. Some types of TCs show differences in the thermoelectric transfer difference between voltage and current mode as large as some parts in 10/sup 6/. In order…
Abstract— We report the formation of an electrostatic complex between (16‐pyrimidinium crown‐4)tetranitrate (16PC4) and tetrakis‐(4‐sulfonatophenyl)porphyrin (4SP) in aqueous solution. Ground‐state complex formation results in a red shift of the 4SP visible absorption bands and a decrease in absorbance of the Soret ba…