Materials Literature
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A technique for determining the deep-center parameters from the relaxational delay of avalanche breakdown of a p-n junction is investigated. The method implemented does not impose any restrictions on the relation between the concentration of the deep centers and that of the dopant impurities and can be used in those c…
We make some notes on symmetry of the steady bubbles generated by the Rayleigh-Taylor instability and on the opportunity of their experimental observation.
The liquid metal-induced embrittlement (LME) of 7075 Al alloy by Ga was investigated by using modified wedge open loaded (WOL) specimens. The results showed that the adsorption of Ga atoms could facilitate local plastic deformation of the base metal and there was an observable concave plastic zone at the notch tip. A…
This work gathers together the study of five soil pedons developed grounds in diapiric formation found in the North of Spain. Three of them formed on igneous volcanic materials (ophites) and two of them formed on sedimentary materials (clay and gypsum) of the Triasic Keuper, in a Mediterranean climate. Initially the m…
The spectral analysis of the electrochemical noise produced by copper corrosion during exposures to artificial industrial waters of different pH values was compared to the results obtained by electrochemical impedance spectroscopy (EIS). The noise impedance spectra are in good agreement with EIS spectra. A particularl…
Temperature dependence of nanoscopic environment of shape memory polymers such as polynorbornene (Tg=313 K), polyurethane (T g=321 K = dynamic viscoelasticity, destruction of hydrogen bond 353 K) and styrene-butadiene copolymer (Tm= 333 K) is observed in terms of free volume parameters -average size, numerical concent…
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…