Materials Literature
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The effect of liquid swelling on the structural rearrangement of lyocell twill fabrics is studied using a variety of techniques, including optical microscopy, dimensional measurements, and water and hexadecane retention. Lyocell fibers swell predominately laterally in water by about 30% over the dry diameter. Fiber la…
Shear stress in fluid dynamics has a well-known impact on vascular cell morphology, proliferation, orientation, and the organization and composition of extracellular matrix. There is an increasing interest in the field of tissue engineering to use defined shear stress in bioreactors for tissue conditioning and guided…
Layered double hydroxides (LDHs) are a class of materials with increasing interest due to their singular properties, which make possible their application in a wide variety of fields. Because LDHs can intercalate anions within their interlayer region, they can be used in medicine as drug supports or matrices. Once enc…
The growth and properties of luminescent ZnGa2O4 thin films using pulsed laser ablation has been investigated. As-deposited films on glass and (100) MgO substrates exhibit blue-white photoluminescence with a broad emission band under ultraviolet excitation. In situ epitaxial films obtained on single crystal (100) MgO…
The active conformation of the dimeric cofactor-dependent phosphoglycerate mutase (dPGM) from Escherichia coli has been elucidated by crystallographic methods to a resolution of 1.25 A (R-factor 0.121; R-free 0.168). The active site residue His(10), central in the catalytic mechanism of dPGM, is present as a phosphohi…
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…