Materials Literature
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Abstract A Raman spectroscopic study was performed to investigate Ba 1− x Sr x TiO 3 ceramics prepared using a solid‐state reaction technique. A single‐phase perovskite structure of the ceramics was verified and no mechanical stresses or grain size effects were identified within the sensitivity of the Raman micro‐prob…
Abstract Increasing the thermal and electrical conductivity of typically insulating polymers, such as nylon 6,6, opens new markets. A thermally conductive resin can be used for heat sink applications. An electrically conductive resin can be used in static dissipative and Electromagnetic Interference/Radio Frequency In…
Cumene hydroperoxide (CHP) has been used in producing phenol and acetone by catalytic cleavage and as an initiator in polymerization. However, many severe fires and explosions have occurred because of its thermal instability and incompatibility. In fact, CHP has been given a hazard classification of flammable type or…
Improved piezoelectric materials with higher vibrational velocities are needed to meet the demands of advanced high power electromechanical applications. In this paper, the effects of Eu and Yb substituents on the vibrational velocity and the piezoelectric properties of Pb(Zr, Ti)O 3 –Pb(Mn, Sb)O 3 ceramics will be re…
In the context of the energy landscape description of supercooled liquids, we propose an explanation for the different behaviour of fragile and strong liquids. Above Goldstein's temperature T x , diffusion is interpreted as a motion in the phase space among saddles of the potential energy. Two mechanisms of diffusion…
In Pseudomonas putida U, the degradation of n-alkanoic and n-phenylalkanoic acids is carried out by two sets of beta-oxidation enzymes (betaI and betaII). Whereas the first one (called betaI) is constitutive and catalyses the degradation of n-alkanoic and n-phenylalkanoic acids very efficiently, the other one (betaII)…
A set of double hydrophilic block copolymers was synthesized on the basis of a branched poly(ethylene glycol)-block-poly(ethyleneimine) (PEG-b-PEI) block copolymer by polymer analogous reactions. Different hydrophobic moieties were successfully introduced as well as carboxylate, phosphonate, sulfonate and thiol groups…
It has been known for a long time that the magnetic exchange interaction between copper and gadolinium ions is always ferromagnetic. Very recently, three exceptions to this general trend were revealed. They involve complexes associating a gadolinium(III) ion with a copper(II) ion or with radicals of the nitroxide or s…
Magnetotransport properties of manganite/insulator composites are studied in this article. By merging the half metallic character of La2/3Ca1/3MnO3 and the mixed composition with alumina grains dispersed in the structure we have been able to increase three times intergranular magnetoresistance around the percolation t…
Adsorption coefficients of 222Rn on five activated charcoal were determined (at -21, +7 and +26 degrees C) by an adsorption-desorption technique using a radon source and an Erlenmeyer flask. They varied from 1.1 to 41.2 L x g(-1). From this variation the mean heat of adsorption of radon on our charcoal was calculated…
X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) have been used to characterize surfaces of aluminum which have been pretreated by mechanical polishing, acid etching and alkaline etching, as well as given subsequent exposures to air and water. These surfaces…
This letter reviews the general model of transformers with off-nominal turns ratios used in power systems steady-state stud- ies. The conventional model of the load tap change transformer (LTC) is shown in terms of the analytical expressions that represent this de- vice. A general model incorporating the effects of th…
In polymer composites the interaction between polymer matrix and filler particles often results in nucleation of spherulites. The principles of polymer crystal nucleation and spherulite growth are investigated using scanning transmission electron microscopy (STEM) and microdiffraction techniques in combination with po…
The piezoelectric constants under two types of engineered domain configurations in perovskite-type oxide ferroelectrics were calculated in terms of the Landau-Devonshire-type free-energy function. It was found that the piezoelectric constants under the engineered domain configurations increase on approaching the morph…
An important part of a general simulation model of the Thermal DeNOx process is the detailed kinetic mechanism used to represent all the interconnecting reaction paths. Unfortunately, the location and dimension of the operating window investigated experimentally to validate a detailed kinetic mechanism strongly influe…
In metallic U-Pu-Zr fuel for fast reactors, metallurgical reactions occur between the fuel alloy and the stainless steel cladding, and a liquid phase may be formed in the reaction zone at a higher temperature. In order to clarify the condition for liquefaction at the fuel-cladding interface, the reactions of U-Pu allo…
Poly(ethylene terephthalate) (PET) is modified by a 248 nm KrF excimer laser with high (above ablation threshold) and low (below ablation threshold) energy irradiation. The PET surface develops a well-oriented periodic structure of hills and grooves or a “ripple structure” with high energy treatment. However, the ripp…
This study showed the complex interactions of alloying elements and their prevailing microstructure on the pitting corrosion. This interaction was illustrated by electrochemical tests of three grades of wrought duplex stainless steels. It was shown that SAF2507 had the highest pitting potential, followed by SAF2205 an…
We investigate the rheological behavior of Langmuir monolayers consisting of polyisoprene chains tethered by one end to the air/water interface. These 10−50 nm thick monolayers provide model systems of a molten polymer brush for which the ends can move within the interface. Their linear viscoelastic properties are det…
Abstract— Two basic approaches (pure component reference (PCR) and equilibrium reference (EQR)) to modeling silicate melt evaporation are explored. The PCR model calculates the maximum possible evaporation rates of the pure oxides from their equilibrium vapor pressures and rescales these rates according to the activit…