Materials Literature
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The competitive environment created by free market electricity supply requires that electric utilities reduce capital and operating expenses and, at the same time, increase the overall quality of electricity. Underground distribution cable systems are particularly sensitive to this need, which can be effectively addre…
This paper presents a new system designed for detecting the pulse-train electromagnetic waves emitted from partial discharge. The authors utilize a VHF wideband antenna array as electromagnetic sensors and calculate the time delay between them in order to locate partial discharge in 3 dimensions. The standard cross co…
This paper presents an approach having the purpose of obtaining charge mobility estimation from space charge measurement data, precisely from the depolarization (volt-off) characteristics provided by the pulsed electro-acoustic technique (PEA). General and approximate expressions are given for mobility calculation. Th…
We have analyzed the relative energy of nonmagnetic and magnetic low-lying electronic states of Ni atoms adsorbed on regular and defective sites of the MgO(001) surface. To this end cluster and periodic surface models are used within density functional theory. For Ni atoms adsorbed on oxygen vacancies at low coverage,…
The quasi-two-dimensional transition-metal dichalcogenide compounds $1T\ensuremath{-}\mathrm{Ta}{X}_{2}(X=\mathrm{S},\mathrm{Se},\mathrm{Te})$ at low temperature form charge-density waves (CDW), manifested in periodic lattice distortions. In order to investigate the effect of the CDW on the Fermi surface (FS) of these…
On-line partial discharge (PD) testing has been used for over 50 years to assess the condition of motor and generator stator winding insulation systems. In the past decade, advanced hardware and software have enabled superior methods of converting the PD data into practical information about the relative condition of…
The Jahn–Teller effect in the charge-ordered (CO) state for La1−xCaxMnO3 (0.5⩽x⩽0.87) was studied by measuring the low-temperature powder x-ray diffraction, internal friction, and shear modulus. We find that the electron–lattice interaction with the static Jahn–Teller distortion is the strongest near x≈0.75 in the CO…
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…