Materials Literature
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Controlling corrosion in production tubing is essential for maintaining production and for preventing loss of well control. Materials for use downhole have to meet criteria for corrosion resistance and also mechanical requirements. The potential corrosion rate can be estimated and the risks of sulphide stress corrosio…
In order to reveal the mechanism of partial discharge (PD) in electrical trees, an artificial single channel is studied as model for tree channels. In a long-narrow channel, the behaviour of PD is similar to that in an actual tree. When the length of the channel is decreased, the /spl phi/-q-n pattern of PD in the cha…
Abstract This paper reviews rinse‐added liquid fabric softener products including current and emerging technologies related to composition, raw materials, and manufacturing processes. An introductory overview of the historical drivers, market trends, advantages and disadvantages, and consumer habits and practices that…
New amphiphilic star polymers possessing a hyperbranched core and hydrophilic graft arms have been prepared. The synthetic strategy involved esterification of the 4,4-bis(4′-hydroxyphenyl)valeric acid based hyperbranched polymer with 3-(chloromethyl)benzoyl chloride to obtain the hyperbranched macroinitiator followed…
This paper is the first of a two-part study of the reaction products of laser-ablated lanthanide metal atoms with O 2 . There is general agreement with previous gas-phase and matrix-isolated neutral monoxides of the lanthanide elements. The present results agree with earlier identifications of CeO 2 and PrO 2 and make…
A large number of mild chemical reactions have recently been developed to modify porous silicon surfaces for optical or sensor applications. The modification reactions generally fall into two classes: those which link a reagent to the Si surface through Si-O linkages, and those which use Si-C linkages. Examples of the…
The microstructure and mechanical properties of silicon nitride, produced by a superplastic sinter‐forging technique, were investigated. The obtained silicon nitride exhibited a highly anisotropic microstructure, where rod‐shaped grains tended to be aligned perpendicular to the forging direction. A very high bending s…
A series of new yttrium(III) double-decker complexes with the same and different phthalocyaninato and porphyrinato ligands has been prepared. The homoleptic complexes Y ( P ) 2 ( P = Pc *(C 7 H 15 ) 8 , Pc *( OC 5 H 11 ) 8 ; Pc * = 2,3,9,10,16,17,23,24-octasubstituted phthalocyaninate) have been synthesized by treatin…
Starting from 1,3,5,7-tetramethylcyclotetrasiloxane as core, novel ferrocenyl silicon-containing dendrimers have been constructed up to the third generation, which contains 16 peripheral ferrocene moieties. As precursors of these ferrocenyl dendritic molecules, SiCl- and Siallyl-terminated cyclotetrasiloxane-based d…
Hemp fabric is hydrolyzed with cellulase, hemicellulase/cellulase, and cellulase plus additional β-glucosidase. The effect of the admixture of hemicellulase and β-glucosi dase is evaluated in terms of hydrolysis rate and product properties. The influence of mechanical action during the treatment is also taken into acc…
Dissociative chemisorption of H 2 O at the MgO(100)−water interface has been investigated both experimentally and theoretically. In particular, metastable impact electron spectroscopy (MIES) was used to image the density of occupied states on the MgO(100)/Mo(100) surface for various degrees of water exposure. After mu…
A dicopper(I)-complexed [3]-rotaxane was prepared in 34% yield by a transition-metal-templated strategy involving a bis-chelating molecular thread, macrocycles incorporating the complementary chelating unit, and porphyrin stoppers as key components. A tetracopper(I)-complexed [5]-rotaxane was obtained as a byproduct i…
Polymethylsilsesquioxane (PMS) and polyvinylsilsesquioxane (PVS) were prepared by acid-catalyzed controlled hydrolytic polycondensation of methyl- and vinyltrimethoxysilane (MTS and VTS), respectively. The spinnabilities and molecular weights of polysilsesquioxanes were easily controlled by the reaction conditions, su…
This paper proposes a new model for three-phase transformers with three legs with and without task under DC bias based on electric and magnetic circuit theory. For the calculation of the nonsinusoidal no-load currents, a combination of time and frequency domains is used. The analysis shows that (1) asymmetric three-ph…
Alkaline treatment is a good method for extracting collagen with high recovery even from an aged animal specimen. However, the properties of collagen treated under alkaline conditions have not been well established yet. By the treatment with a solution of 3% sodium hydroxide and 1.9% monomethylamine, the isoelectric p…
Proton conductivity phenomena in 10% Y-doped barium and strontium cerate are investigated experimentally and by quantum molecular dynamics simulations. In particular the impact of deviations from the cubic perovskite structure on the formation and mobility of protonic charge carriers is investigated. For Y: SrCeO3, wh…
Based on the principle of electronegativity equalization and density functional theory, a lone pair electron model was developed through partitioning the molecular electron density into atomic electron densities, chemical bond electron densities, and lone pair electrons’ densities. The expressions of total molecular e…
A Hydrogenophaga pseudoflava strain was able to synthesize poly(3-hydroxybutyric acid-co-4-hydroxybutyric acid) [P(3HB-co-4HB)] having a high level of 4-hydroxybutyric acid monomer unit (4HB) from gamma-butyrolactone. In a two-step process in which the first step involved production of cells containing a minimum amoun…
The dislocation structure of a typical low-angle boundary associated with a kink band in a sample of Ti3SiC2 deformed at room temperature was studied by high-resolution transmission electron microscopy. The boundary had both tilt and twist components. To account for both, the boundary was interpreted to be composed of…
Abstract In order to verify the possibility of manufacturing good quality articles by recycled polypropylene (PP), a study on the effect of many recycling operations on the rheological and mechanical properties of PP was conducted. The amount of degradation occurring during the reprocessing was estimated in the melt s…