Materials Literature
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Partial discharge (PD) may have a significant effect on the insulation performance of power apparatus. Therefore, identification of PD sources is of interest to both power equipment manufacturers and utilities. With the development of PD measurement techniques, data analysis, signal processing and pattern recognition…
Particle motion of a Lennard-Jones supercooled liquid near the glass transition is studied by molecular dynamics simulations. We analyze the wave vector dependence of relaxation times in the incoherent self-scattering function and show that at least three different regimes can be identified and its scaling properties…
PbS microcrystals with a magic-square-shaped structure were successfully fabricated via a simple hydrothermal route, employing (CH3COO)2Pb and Na2S2O3 as the lead and sulfur source without the assistance of any surfactant or template. S2O32- ions acted not only a supplier of S2- ions but also a coordinating reagent. T…
Different diagnostic techniques are currently available for on-line insulation condition assessment of power transformers. Amongst these techniques a relatively new technique for detecting partial discharges (PD) in the ultra high frequency range of the spectrum is also introduced. The UHF technique has been recently…
Abstract A simple method based on a plasma oscillations theory of solids is proposed for the calculation of mechanical and optical properties such as microhardness ( H ), bulk modulus ( B ), dielectric constant ( ϵ ), polarizability ( α ), electronic susceptibility ( χ ) of A II B IV C 2 V and A I B III C 2 VI semicon…
Electrical degradation of the insulating systems of energy cables is close related to the water treeing and space charge development. In this paper the results of the calculations of the electric field repartition in the insulation of a medium voltage cable affected by water trees and their related space charge are pr…
Nano-silica and micro-silica particles were mixed with silicone rubber. The resulting materials were compared with respect to erosion damage in inclined plane, and surface roughness and contact angle of virgin samples. Results have shown that nano-silica filled room temperature vulcanized (RTV) silicone rubber (SR) ha…
We have calculated the phonons and elastic constants of zirconium in the hexagonal-close-packed (hcp) crystal structure using the Naval Research Laboratory (NRL) empirical tight-binding (TB) approach; the tight-binding parameters are obtained by fitting to ab initio density-functional theory--generalized gradient appr…
Atomic structure and structural stability of neutral oxygen vacancies on amorphous silica are investigated using combined Monte Carlo and density functional calculations. We find that, unlike their bulk counterparts, the Si-Si dimer configuration of surface oxygen vacancies is likely to be unstable due to the high ten…
Nucleation parameters such as metastable zone width, induction period and interfacial energy have been determined for the aqueous solution growth of bis thiourea cadmium acetate (BTCA) single crystals. Solubility of BTCA has been determined for various temperatures. Metastable zone width and induction period values ha…
A generalized scattering boundary equation method (SBM) is proposed for the calculation of the vibrational amplitude transmission across solid junctions. An energy transmission expression with relation to atomic masses, lattice constants, and group velocities is elucidated. The phonon transmission is computed by the S…
The effect of carboxymethyl cellulose (CMC) coating on the mass exchanges during the osmotic dehydration of apples and its effect on the quality of final product were studied. Coating semi-rings of apple with CMC solution (1%) was found to prevent solute uptake and to reduce salt diffusion coefficient from 4.35 × 10−1…
In the present study three crystals of thiourea family viz. Zinc Thiourea Chloride (ZTC), Zinc Thiourea Sulfate (ZTS) and Bisthiourea Cadmium Chloride (BTCC) were grown from aqueous solution by slow evaporation technique. The grown crystals were studied by powder XRD, FT-IR and UV-visible. The dielectric study of grow…
Experimental uncertainties concerning the coordination mode of trivalent plutonium in concentrated LiCl have led us to theoretically evaluate the f-f transitions of a series of rare earth aquo and chloro complexes. The calculation of Pr(III), U(III), Np(III), and Pu(III) systems' spectra was undertaken using the LFDFT…
A nanostructured spinel-type oxide catalyst (CoCr2O4) prepared by solution combustion synthesis was developed and deposited over a SiC wall-flow trap for diesel particulate removal. Bench tests proved that, after soot loading, the developed trap enables a faster and more complete regeneration at 550 degrees C than a c…
The nonlinear optical single crystals of L-Lysine monohydrochloride dihydrate (L-LMHCl) have been grown and examined by High-resolution X-ray diffraction and etching studies for their perfection. The vibrational frequencies have been identified by the micro-Raman studies and the dielectric behaviour has been studied a…
We report a study on the mechanical properties of lamellae-forming glassy−semicrystalline block copolymers composed of poly(cyclohexylethylene) (C) and polyethylene (E). Tensile properties of polydomain CEC, ECEC, CECEC, and ECECE block copolymers, and blends of these materials, reveal a critical dependence on the con…
Nanocrystalline Y 2 O 3 :Eu phosphors have been successfully synthesized by a novel combustion method using sucrose as a chelating agent and fuel. The sucrose hydrolysation and complexing mechanisms are discussed. X-ray diffraction analysis showed that the cubic phase can be formed at a low temperature of 400 °C, and…
Abstract A series of inert and photostable encapsulated lanthanide(III) complexes—based on dendritic anthracene ligands—is shown for the first time to exhibit strong near‐IR emission bands via efficient energy transfer from the excited states of the peripheral antenna to the Ln 3+ ions (Er 3+ , Yb 3+ , and Nd 3+ ). A…
A Hartree-Fock based (HF), multiconfiguration self-consistent field (MCSCF) method has been used to configure computationally several nonstoichiometric model pyramidal molecules of In, Ga, and As atoms with a predesigned electronic energy level structure. The geometry, structure, and composition of the molecules have…