Materials Literature
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We show that the method of factorizing the evolution operator to fourth order with purely positive coefficients, in conjunction with Suzuki's method of implementing time-ordering of operators, produces a new class of powerful algorithms for solving the Schroedinger equation with time-dependent potentials. When applied…
This work studies the influence of microstructures and crystalline defects on the superconductivity of MgB2, with the objective to improve its flux pinning. A MgB2 sample pellet that was hot isostatic pressed (HIPed) was found to have significantly increased critical current density (Jc) at high fields than its un-HIP…
Calculations of L-shell x-ray absorption in transition metals are shown to be sensitive to screening, both of the x-ray field and the photoelectron-core hole interaction. This screening is calculated using a generalization of the time dependent local density approximation and a projection onto a local atomic basis. Th…
Glycerol is oxidised to glyceric acid with 100% selectivity using either 1% Au/charcoal or 1% Au/graphite catalyst under mild reaction conditions (60 degrees C, 3 h, water as solvent).
<div class="htmlview paragraph">A procedure for the computation of fatigue life of shafts subjected to variable amplitude independent bending and torsion loading is described. The elastic superposition technique, followed by a Neuber plasticity correction, also allows for the initial and possibly cyclic plastici…
The influence of carbon precursors, such as methane (CH4), acetylene (C2H2), and propane (C3H8), on the gas-phase chemistry of the TiCClH system used to deposit titanium carbide (TiC) from titanium tetrachloride (TiCl4) was investigated by calculating the thermodynamic equilibrium and modeling rate equations from a…
Abstract Plasma transferred arc spraying of tungsten carbide coatings can significantly increase the service life of machines and components subject to wear. This paper assesses the effect of such coatings in oil sand processing equipment. It describes the development and testing of the layers used and explains that t…
<div class="htmlview paragraph">Development of the ultra thin wall ceramic catalytic substrate is necessary to meet increasingly strict emissions regulations. The cell walls need to be thinner in order to improve the warm-up characteristics related to the reduction of emissions and to lower the back pressure. Ho…
Hexadentate cyclen complexes of Sm(III), Eu(III) and Yb(III) have been prepared from 1,4-bis[(R)-α-methylbenzylaminocarbonylmethyl]-1,4,7,10-tetraazacycldodecane and characterised. The crystal structures of the isomorphous complexes of Eu(III) and Sm (III) have been determined. These may be electrochemically reduced t…
<div class="htmlview paragraph">Bare magnesium is not compatible with the zinc phosphate process commonly used in automotive manufacturing today. If a magnesium component is assembled onto the vehicle prior to the phosphate process, it must be coated beforehand to prevent magnesium dissolution in the phosphate b…
<div class="htmlview paragraph">To establish performance trends in ultra thin wall substrates and help support their selection criteria for designing catalytic converter systems, the light-off behavior of five Ultra Thin Wall ceramic substrates and two catalysts on an engine dynamometer are hereby examined. Mode…
<div class="htmlview paragraph">This paper summarizes results from a large study on the desulfation characteristics of lean NO<sub>x</sub> traps. Degreened and thermally aged NO<sub>x</sub> trap formulations were poisoned with SO<sub>2</sub> multiple times in a flow reactor. T…
We have grown Er,O-codoped InGaAs/GaAs multiple-quantum-well (MQW:Er,O) structures by low-pressure organometallic vapor phase epitaxy (OMVPE), and investigated their luminescence properties. The MQW structures are designed to emit light at 0.98 μm for direct excitation of Er ions. Degradation of the structures due to…
Using a scanning microwave microscope, we investigated the local electrical properties of epitaxial CaRuO3 thin films. The films showed a metal–insulator transition depending on the growth temperature and their thickness. We observed spatially separated highly conducting and poorly conducting regions in the films grow…
3D ordered macroporous multicomponent composite materials have been fabricated by electrochemical deposition of aniline on the inner surface of macroporous carbon; the maximum thickness of polyaniline (PANI) deposited is dependent on the concentration of the aniline as well as the dimension of the windows in the macro…
A co-occurrence of magnetic and structural transitions was observed in a nonstoichiometric Ni53Mn25Ga22 alloy which undergoes a reverse martensitic transformation from ferromagnetic martensite to paramagnetic austenite at a magnetic transition temperature (134 °C) higher than the Curie temperature of the stoichiometri…
<div class="htmlview paragraph">Delphi Automotive Systems and BMW are jointly developing Solid Oxide Fuel Cell (SOFC) technology for application in the transportation industry primarily as an on-board Auxiliary Power Unit (APU). In the first application of this joint program, the APU will be used to power an ele…
La 0.5 Ba 0.5 MnO 3 nanowires were synthesized by a hydrothermal method at low reaction temperature (270 °C). The synthesized nanowires are of pure, cubic perovskite structure and single crystalline. They grow along [110]; their surfaces are clean, very regular, and without any sheathed amorphous phase. Typical length…
Tridirectional conductivity in a polymeric material has been achieved. Nanoscale “wires” formed via hierarchical self-organization of a basic block copolymer and a monomeric acid/alkylphenol complex establish a lamellar-within-lamellar superstructure (see Figure), resulting in a soft material with tunable conductivity…
Abstract A series of shape memory polyurethanes (SPU) with different component ratio of PEG, MDI, BDO, and crosslinker DEA were synthesized by stepwise polymerization in DMF. WAXD, SAXS, DMTA, and DTA were used to study the microphase structure of SPU. No obvious phase‐separation and crystalline evidence of the PEG so…