Materials Literature
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We have investigated the undesired reduction of spin polarization in La 1- x Sr x MnO 3 (LSMO)/SrTiO 3 (STO)/LSMO spin tunnel junctions by employing superlattices of LSMO/STO with various x of 0.2, 0.3, and 0.4. The systematic data revealed that the instability towards the A-type (layered) antiferromagnetic phase domi…
Acyl-CoA dehydrogenase gene (yafH) of Escherichia coli was expressed together with polyhydroxyalkanoate synthase gene (phaC(Ac)) and (R)-enoyl-CoA hydratase gene (phaJ(Ac)) from Aeromonas caviae. The expression plasmids were introduced into E. coli JM109, DH5 alpha and XL1-blue, respectively. Compared with the strains…
This paper describes the hydrophobic transfer of unfilled room temperature vulcanized silicone rubber (RTV) resulting from UV radiation, corona discharges, high temperature, and a deposition of hydrophilic layer. The chemical and morphological structure at the surface layer and the migrating behavior of low molecular…
The substance MHPOBC is the oldest and still most important reference antiferroelectric liquid crystal (AFLC). There is still considerable controversy concerning the correct phase designations for this material and, in particular, about the presence or absence of SmC* in its phase sequence. By means of dielectric spec…
The breakup of dislocation dipoles in plastically deformed samples of undoped and 30‐ppm‐MgO‐doped sapphire (α‐Al 2 O 3 ) was monitored using conventional TEM techniques. Dislocation dipoles break up into prismatic dislocation loops in a sequential process during annealing; i.e., dislocation loops are pinched off at t…
The effects of oil palm wood flour and vulcanization system on curing characteristics and mechanical properties of oil palm wood flour (OPWF)-natural rubber composites were studied. OPWF loading in the range of 0-50 phr and two vulcanisation systems, conventional vulcanisation (CV) and semi-efficient vulcanisation (se…
The rate of thiol-disulfide exchange of dansyl groups mediated by dithiothreitol depends on the structure of the dendrimer. In general, the rate of exchange decreases as the size of the dendrimer increases. Dendrimers with disulfides attached near the core undergo exchange more slowly than dendrimers with disulfides n…
Abstract Non-ionic surfactants Brij 56 and Igepal CO 720, containing hydrophilic poly(ethylene oxide) (PEO) segments, expanded smectite from 1.5 nm to 1.7 nm at room temperature. The surfactant-smectite composites had larger layer spacings than Ca-smectite after heat treatment. The surfactant-smectite composites were…
Carbon-hydrogen bond cleavage reactions of CH3OH and CH4 by a dirhodium(II) diporphyrin complex with a m-xylyl tether (.Rh(m-xylyl)Rh.(1)) are reported. Kinetic-mechanistic studies show that the substrate reactions are bimolecular and occur through the use of two Rh(II) centers in the molecular unit of 1. Second-order…
In order to detect and locate partial discharge (PD) activity within HV cables and in particular cable joints, the feasibility of using a very high frequency WHO capacitive coupler technique has been investigated. In addition, an alternative PD offline test method for cable joints or cable sections within long cable s…
Alumina bicrystals with low‐angle and near‐Σ3 <0001> tilt grain boundaries were fabricated using diffusion bonding to study the dislocation structures in alumina grain boundaries. The resulting grain‐boundary structures were investigated using high‐resolution transmission electron microscopy, and the grain‐bound…
We present a novel method for forming linearly polarized axially symmetric beams with various polarization orders that is based on computer-generated space-variant subwavelength gratings. We introduce and experimentally demonstrate that our space-variant polarization state manipulations are accompanied by a phase modi…
Abstract Silica‐based hybrid organic‐inorganic materials prepared by sol‐gel chemistry exhibit chemical and physical properties revealing their anisotropic organization. Besides the opportunities that these phenomena open for the preparation of new materials, they also provide arguments for the chemist looking for bet…
PURPOSE: To compare the diagnostic accuracy of gadobenate dimeglumine (Gd-BOPTA)-enhanced versus gadoterate meglumine (Gd-DOTA)-enhanced magnetic resonance (MR) angiography in patients with peripheral arterial occlusive disease (PAOD). MATERIALS AND METHODS: Fifty-six patients underwent MR angiography enhanced with ei…
Symmetrical Σ7 tilt grain boundaries of alumina (Al 2 O 3 ) were studied using bicrystals. Three types of Σ7 boundaries were successfully fabricated, that is, rhombohedral twin (Σ7{1[Onemacr]02}) and two types of [0001] symmetrical tilt grain boundaries with grain‐boundary planes {4[Fivemacr]10} and {2[Threemacr]10} (…
We report the growth and detailed structural investigation of a new morphological manifestation of carbon-based nanostructures in the form of tapered whiskers with uniform 1−3 nm hollowness. The base of the whiskers is in the submicron scale, tapering uniformly to form a pointed tip in the form of a pipette. These hol…
Recent developments in modelling the sintering process of powder compacts are critically reviewed. Both free sintering and pressure assisted sintering are considered. The review approaches the sintering models from the point of view of an end user of the models and sets out to: assess how useful and accurate the exist…
Adsorption isotherms for hydrogen on single-walled nanotubes (SWNTs) subjected to various types of pretreatment have been measured by a tapered-element oscillating mass analyzer. Isotherms at room temperature over a range of pressures up to 48 bar have been measured. We demonstrate that activation of the SWNT samples…
BACKGROUND: Exposing the developing tissue to flow and pressure in a bioreactor has been shown to enhance tissue formation in tissue-engineered heart valves. Animal studies showed excellent functionality in these valves in the pulmonary position. However, they lack the mechanical strength for implantation in the high-…
Abstract The hyperbranched (HB) aromatic polyamide synthesised by direct polycondensation of 5‐(4‐aminobenzoylamino)isophthalic acid (ABZAIA) has been solution‐ and melt‐ blended with polyamide 6 (PA6) incorporating different end groups. The concentration of p(ABZAIA) in PA6 has been varied from 5 to 30 wt.‐% in order…