Materials Literature
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New copper(II) toluate complexes with saturated monoheterocyclic bases, substituted piperidines, of the type Cu(OOCR)2L (where R = 2‐, 3‐, or 4‐CH3C6H4 and L = 1‐methyl‐, 1‐ethyl‐ or 2,6‐dimethylpiperidine) have been synthesized and characterized by elemental analyses, IR, electronic reflectance and EPR spectral and m…
Corona charging is a powerful method for studying storage and electric charge transport in dielectric films. The development of this technique for the study of polymer foils is summarized. The improvement achieved with the use of a biased vibrating grid, allowing the measurement of the potential buildup is commented o…
The thermal aging of cross-linked polyethylene (XLPE) cable models has been investigated to obtain information on aging effects and mechanisms. After thermal life tests, XLPE cable models were subjected to chemical, physical, electrical and microstructural characterizations. The results of density, melting point and e…
Measurements carried out on a large wall bushing are described. They show that uneven rain distribution can cause flashovers even at very low pollution levels. A possible mechanism for these rain flashovers is proposed. It is reported that water-repellent surfaces provide an efficient remedy for this type of flashover…
Corona-charging characteristics of a nonwoven polypropylene sheet of 140- mu m thickness are studied with respect to the charging conditions. When the grid voltage, V/sub g/, which controls the surface potential of the film, is -3 kV, the surface potential profile of the charged sheet is nonuniform. The profile is ver…
We introduce here one possible definition of the energy of an infinite non-periodic system of particles. We investigate the minimization of it, and the link with standard definitions of local ground state for such systems. The specific models under study are issued from Quantum Mechanics (namely from Density-Functiona…
Castable particulate-filled epoxy resins exhibiting excellent thermal conductivity have been prepared using hexagonal boron nitride (BN) as filter. The thermal conductivity of BN filled epoxies is influenced by the sample preparation procedures, due to agglomeration effects of the particles in the matrix. The temperat…
Radiation-induced changes in the density and viscosity of 30% TBP–n-dodecane–HNO3 mixtures were examined. The increase in the density becomes significant with increasing nitric acid content of the solvent, [HNO3]TBP, and absorbed radiation dose, which concomitantly leads to a much sharper increase in the viscosity of…
The antiferromagnetic, charge and orbitally ordered (AFCOO) ground state of some manganites like ${\mathrm{Pr}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}$ can be efficiently destabilized by slight Mn-site substitutions. Such a weakened AFCOO state and related disorder effects were investigated in ${\mathrm{Pr}}_{0.5}…
The available starting methods are discussed for motors above 3000 hp, focusing on technical and economic aspects. The following schemes are discussed: direct online, reactor start, auto transformer start, capacitor start, capative transformer start, and frequency start. A review of the network conditions which favor…
Abstract The synthesis and photochromic reaction of 1,2‐diphenylperfluorocyclopentenes are reported. Upon UV irradiation, hexane solutions of 1,2‐diphenylperfluorocyclopentenes afforded red solution of dihydrophenanthrenes, which gradually give the initial 1,2‐diphenylperfluorocyclopentenes at room temperature thermal…
Simple far-field emission polarization microscopy reveals that the emission transition dipole of CdSe colloidal quantum dots (QDs) is twofold degenerate at room temperature. We measure, model, and compare polarization anisotropy statistics of CdSe QDs and DiI (a one-dimensional emitter). We find excellent agreement be…
Relaxation of conduction electron spins in a semiconductor owing to the hyperfine interaction with spin-1/2 nuclei, in zero applied magnetic field, is investigated. We calculate the electron spin relaxation time scales, in order to evaluate the importance of this relaxation mechanism. Master equations for the electron…
The anisotropy of low-energy $(0\ensuremath{\sim}5\mathrm{eV})$ optical excitations in strongly correlated transition-metal oxides is closely related to the spin and orbital orderings. The recent successes of $\mathrm{LDA}+U$ method in describing the magnetic and electronic structures enable us to calculate the optica…
Accurate calculations for the phonon dispersion relations of single-wall armchair and zigzag nanotubes are presented. The calculations are performed using a plane-wave basis set and density functional theory. To ensure the accuracy of the presented calculations, the phonon dispersion relation of an isolated graphite l…
A control system for a shape memory alloy (SMA) servo actuator, and its application to a unique medical tool, are considered. It is thought that the electric resistance value of an SMA can be utilized to monitor the transformation of the SMA directly. Therefore, an antagonistic transformation control scheme using elec…
Transport and magnetic properties of polycrystalline ${\mathrm{La}}_{2}{\mathrm{CoMnO}}_{6\ensuremath{-}\ensuremath{\delta}},$ $0<~\ensuremath{\delta}<~0.05,$ have revealed the existence of two distinguishable monoclinic ferromagnetic phases separated by a two-phase domain $0.02<~\ensuremath{\delta}<~0.05$…
There is a greater demand for antimicrobial finishes on textile goods because consumers have become aware of the potential advantages of these materials. A number of other chemicals are also used i...
In this article, we give some mathematical results for an isothermal model of capillary compressible fluids derived by Dunn and Serrin in [1] Anderson, DM, McFadden, GB and Wheeler, GB. 1998. Diffuse interface methods in fluid mechanics. Annual Review of Fluid Mech, 30: 139–165. [Crossref], [Web of Science ®] , [Googl…
Recently published experimental data concerning more than ten copolymerization systems were re-analyzed. Newer, more accurate, reactivity ratios were calculated using a non-linear method (PROCOP) which involves all the experimental data including conversion values. The differences between the reactivity ratios provide…