Materials Literature
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Experimental results are presented to show that SMA actuators are able to control forces both rapidly and precisely. An antagonistic pair of constrained actuators is shown to be capable of rapidly changing the set-point throughout a /spl plusmn/7.00 N range. Although the system entered into a limit cycle at the set-po…
The site occupancy of manganese zinc ferrite (MZFO) nanoparticles is determined by a multiple-edge refinement of the extended x-ray absorption fine structure of the manganese, zinc, and iron absorption edges. The MZFO nanoparticles are generated by a reverse micellar synthetic route and compared to a ceramic standard.…
We present ion mobility measurements for small gold cluster cations, Aun+(n⩽10) in the temperature range between 77 and 300 K. While at room temperature all cluster sizes show only one sharp peak in the arrival time distribution, the Au9+ signal becomes bimodal at temperatures below 140 K. We interpret this unusual be…
A high-yield synthesis of atropoisomers of the meso-tetrakis(o-isonicotinoylamidophenyl)porphyrin was achieved. Depending on the crystallising solvent system, the α2β2 atropoisomer leads to the formation of either 1-D or 2-D coordination networks in the presence of Cu(OAc)2.
The local density approximation has been implemented to determine the band structure of orthorhombic crystals ${\mathrm{YAlO}}_{3}$ (YAP) and SbSI. The topology of the valence band structures was analyzed. It has been demonstrated that Zak's elementary energy bands in the band structure are distinguishable on the basi…
The relaxation dynamic of a dipole of +1/2 and -1/2 parallel disclination lines in a confined geometry is measured. The confinement and the planar anchoring conditions force the disclinations to be normal to the glass plates. In a first asymptotic regime, the direct elastic interaction between disclination is complete…
Three examples of nitrido-functionalized polyoxometalate species are reported, namely (n-Bu4N)4[PW11O39(OsN)] (1), (n-Bu4N)4[PW11O39(ReN)] (2), and (n-Bu4N)3[PW11O39(ReN)] (3), which feature the incorporation of [OsVI identical to N]3+, [ReVI identical to N]3+ and [ReVII identical to N]4+ fragments, respectively, into…
Abstract Polyamide‐6 (PA6)/vermiculite nanocomposites were fabricated through the direct melt compounding of maleic anhydride‐modified vermiculite (MAV) with PA6 in a twin‐screw extruder followed by injection molding. The structure and morphology of the nanocomposites were determined by X‐ray diffraction and scanning…
The installation and of a 5 MVA, 4.16 kV Distribution-level Static Reactive Compensator (D-STATCOM) was completed in July, 1999 at the Seattle Iron & Metals Corporation's new steel recycling facility in Seattle, Washington, USA. The D-STATCOM technology was selected as the preferred option for the voltage flicker comp…
Lanthanide 2,3-pyrazinedicarboxylate complexes with three-dimensional frameworks, [Ln2(pzdc)3(H2O)]x·2xH2O [Ln = Pr (2), Nd (3), and Eu (4)], were obtained by hydrothermal reactions of 2,3-pyrazinedicarboxylic acid (H2pzdc) and the lanthanide(III) chlorides, while [La2(pzdc)3(H2O)]x·2xH2O (1) was obtained by hydro(sol…
By applying a negative voltage to the conducting tip of an atomic force microscope, we modify on submicron-scale semiconducting oxygen deficient SrTiO3−δ thin films grown on LaAlO3 substrates. In comparison with the as-grown film, the modified regions present different electrical and structural properties, which can b…
We report on verification of the proposed energy transfer mechanism responsible for photoluminescence of rare earth (RE) ions in semiconductors. Using two-color spectroscopy in the visible and the midinfrared regions (with a free-electron laser) we demonstrate reversal of the most important step in the excitation proc…
Gain-determining coefficients in Er-doped, nanocrystal-Si (nc-Si) sensitized silica waveguide amplifiers are investigated. Single-mode, Er-doped silica waveguides with nc-Si embedded in them were prepared by electron cyclotron resonance plasma-enhanced chemical vapor deposition of Er-doped a-Si:Ox (x<2) followe…
Electromagnetic wave scattering by two rectangular troughs on a ground plane, which is the simplest trough-grating geometry, is rigorously analyzed by using Kobayashi and Nomura's method. This method is a kind of eigenfunction expansion method in terms of Weber-Schafkeitlin type integrals. In order to show the validit…
The stator winding insulation of large generators suffers from combined stresses including thermal, mechanical, electrical and environmental stresses in service, resulting in gradual deterioration. In the present investigation, a multistress aging test model including electrical, thermal, mechanical vibration and ther…
This paper describes the harmonic analysis method which can be used to measure the resistance current of the metal oxide arrester (MOA) and the dielectric loss of the capacitive apparatus. The theory of this method and the requirement to the hardware circuit are introduced also. The testing and the analysis of the the…
Results of investigations performed in order to improve the current diagnostic techniques used for the evaluation of insulation systems of AC rotating machine stator windings are presented. Improvements come from the development of a new measuring system and the stochastic analysis of partial discharge (PD) pulse sign…
We have shown that reduction of deuterium permeation through AISI 316L stainless steel can be obtained by the deposition of an (Al,Ti)N coating: a 1.7-μm-thick coating was able to reduce the deuterium permeation flux by a factor 100–1000 in the 473–873 K temperature range. This result is related to the very low diffus…
This paper describes our theoretical and experimental approaches to the mechanisms responsible for electrical conduction at low and high fields, electrical aging, partial discharge and breakdown phenomena in insulating polymers. Electrical conduction always involves carrier injection from electrical contacts and subse…
This paper investigates the use of finite-difference time-domain (FDTD) models in the study of electrical discharges, particularly through the measurement of radiated signals. Support for electrostatic fields within the model is demonstrated. Signals radiated by a partial discharge pulse are simulated and found to be…