Materials Literature
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Iron perovskites ${\mathrm{CaFeO}}_{3}$ and ${\mathrm{La}}_{0.33}{\mathrm{Sr}}_{0.67}{\mathrm{FeO}}_{3}$ show charge disproportionation, resulting in charge-ordered states with ${\mathrm{Fe}}^{3+}:{\mathrm{Fe}}^{5+}=1:1$ and $=2:1,$ respectively. We have made photoemission and unrestricted Hartree-Fock band-structure…
To meet the increasing world demand for energy, the rate of depletion of non-renewable energy sources must be reduced while developing alternative renewable sources. This can be achieved by increasing the overall thermal efficiency of conventional power plants. One way to do this is by waste heat recovery. Most of the…
A series of CuCoZnAl-multicomponent mixed oxide catalysts with various Cu/Co atomic ratios were prepared by the thermal decomposition of CuCoZnAl-hydrotalcite (HT)-like precursors at 450 °C in static air atmosphere. The XRD of calcined materials revealed the formation of a mixture of CuO and ZnO, Co 3 O 4, and/or ZnCo…
The speed control of ac-electric motors can be carried out efficiently by adjustable speed drives (ASD), which are constituted by an AC/DC conversion block, a DC filter and a DC/AC inverter representing the core of the whole power converter. A new generation of DC/AC converters for adjustable speed drives, the so-call…
Geomagnetically induced currents (GIC) can cause severe transformer half-cycle saturation. This paper introduces a simplified method based on the equivalent magnetizing curve of the transformer to estimate harmonic currents and MVAr with only the given the GIC and nameplate and core design information of the transform…
This paper reports the effect of voltage distortion and imbalance (VDI), on the thermal aging of the insulation of low voltage induction motors. The study is based on a detailed thermal modeling of actual motors in the 2 to 200 HP range. The dollar value of the useful life lost was estimated for different VDI conditio…
Abstract The effects of various types of compatibilizers on the mechanical properties of high‐density polyethylene/wood flour composites were investigated. Functionalized polyolefins, including maleated polyethylenes, polypropylene, and styrene–ethylene/butylene–styrene copolymer, were incorporated to reduce the inter…
This paper deals with the removal of a small sphere initially attached to a liquid interface. The sphere is small enough (0.3−1 mm) for the capillary force to dominate the interaction and large enough for the line tension effect to be negligible. We have measured simultaneously the force and the geometric parameters o…
Thin films of La0.7Sr0.3MnO3 on MgO show a metal insulator transition and colossal magnetoresistance. The shape of this transition can be explained by intrinsic spatial inhomogeneities, which give rise to a domain structure of conducting and insulating domains at the submicrometer scale. These domains then undergo a p…
Using the quantum Monte Carlo method, we investigate the spin dynamics of itinerant electrons in the one-dimensional Hubbard system. Based on the model calculation, we have studied the spin-fluctuations in the quarter-filled metallic Hubbard ring, which is aimed at the vanadium ring or chain defined along corner-shari…
A sensitive polarization modulation technique uses photoelastic modulation and hetrodyne detection to simultaneously measure the Faraday rotation and induced ellipticity in light transmitted by semiconducting and metallic samples. The frequencies measured are in the mid-infrared and correspond to the spectral lines of…
We propose a density functional for anisotropic fluids of hard body particles. It interpolates between the well established geometrically based Rosenfeld functional for hard spheres and the Onsager functional for elongated rods. We test the new approach by calculating the location of the nematic–isotropic transition i…
FULLPAT is a quantitative X-ray diffraction methodology that merges the advantages of existing full-pattern fitting methods with the traditional reference intensity ratio (RIR) method. Like the Rietveld quantitative analysis method, it uses complete diffraction patterns, including the background. However, FULLPAT can…
An automated system for mounting and dismounting pre-frozen crystals has been implemented at the Stanford Synchrotron Radiation Laboratory (SSRL). It is based on a small industrial robot and compact cylindrical cassettes, each holding up to 96 crystals mounted on Hampton Research sample pins. For easy shipping and sto…
This paper discusses the development status of the memory cell element of OUM (Ovonic Unified Memory) - a chalcogenide-based, phase-change nonvolatile semiconductor memory technology at the 180 nm technology node. The device structure and characterization of the memory element will be reviewed. The key characteristics…
BaMgAl 10 O 17:Eu 2+ phosphors are synthesized by solid-state calcining of BaCO 3, Al 2 O 3, MgO, and Eu 2 O 3 with AlF 3 as a flux. The structural and optical properties of the blue phosphor are investigated as a function of the europium concentration in BaMgAl 10 O 17 using the neutron and the X-ray powder diffracti…
In this paper, it is pointed out that the light transmission anomalies observed for thin-film metallic gratings can be explained entirely in terms of dynamical diffraction theory. Surface plasmons are an intrinsic component of the diffracted wave field and, as such, play no independent causal role in the anomalies, as…
The novel morphology of BN nanotubes with a collapsed structure has been discovered by a metal-catalyzed treatment. The collapse causes the dramatic enlargement of a specific surface area of BN nanotubes and remarkably enhances the hydrogen storage capacity of BN nanotubes.
High solubility of SWNTs and MWNTs in water is obtained by organic functionalisation; derivatisation with N-protected glycine is also easily achieved.
An extension to the Steinmetz equation is proposed, to enable estimation of hysteresis losses in magnetic core materials with nonsinusoidal flux waveforms. The new formulation is shown to avoid anomalies present in previous modified-Steinmetz-equation calculations of loss with nonsinusoidal waveforms. Comparison with…