Materials Literature
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The galvanic replacement reaction between silver and chloroauric acid has been exploited as a powerful means for preparing metal nanostructures with hollow interiors. Here, the utility of this approach is further extended to produce complex core/shell nanostructures made of metals by combining the replacement reaction…
The cavities are inherent shortcomings of XLPE insulation used in electrical cables. Their effects are to tamper the dielectric properties of the insulating material. Indeed partial discharges occur in these cavities for relatively weak electric fields. The purpose of this work is to determine by simulation, the disto…
Effects of the enhancement of photoconductivity in 2D photonic macroporus silicon structures were investigated. Dependence of photoconductivity on the angle of incidence of the electromagnetic radiation is observed with maxima at normal incidence of electromagnetic radiation, in the region of the angle of full interna…
We present a theoretical study of the transport properties of a $\text{CrAs}∕\text{GaAs}∕\text{CrAs}$ trilayer. The theory was based on a first principles method for calculating the electronic structure, in combination with a Kubo-Landauer approach for calculating the transport properties in a current perpendicular to…
The corona-like discharges on the top surfaces of lightly contaminated glass cap-and-pin insulators in a "V" configuration have been observed on an operational 400 kV line. Although it is postulated that such discharges may contribute to an insulator flashover, this is not the focus of this research. The objective of…
We have investigated adsorption of an O(2) molecule on a double-walled carbon nanotube (DWCNT) edge using density functional theory calculations. An O(2) molecule adsorbs exothermally without an adsorption barrier at open nanotube edges that are energetically favorable with a large adsorption energy of about -9 eV in…
In this study the erosion of poly(ethylene tetrafluoroethylene) (ETFE) (Tefzel) by hyperthermal atomic oxygen (AO) has been examined using X-ray photoelectron spectroscopy (XPS). Initially, the Tefzel film had F/C and O/C atom ratios of 0.74 and 0.04, which decrease to 0.17 and 0.01, respectively, after a 2 h exposure…
A novel water-soluble copolymer of aniline and aminophenol (AP) grafted with oligo(oxyethylene) (PEO) side chains (AP- g -PEO) was synthesized. The AP- g -PEO macromononer was prepared starting from an N-protected 3-aminophenol (protection group: tert -butoxycarbonyl) followed by the substitution of tosylated oligo(ox…
Abstract The reactive blending of bisphenol A polycarbonate (PC) with poly(1,4‐cyclohexanedimethylene‐1,4‐cyclohexanedicarboxylate) (PCCD) was investigated with a new high‐temperature solution‐blending methodology. The ester–carbonate exchange reaction (transesterification) in the blends was studied with NMR and Fouri…
Discharges in power equipments may be a symptom of a fault in a component and, in such cases, their detection at an early stage is essential. This work presents the detection and identification methods based on frequency and time domain measurements made with an antenna, oscilloscope and a laptop. The identification o…
The effects of the cooperative Jahn-Teller effect on the crystal structure and the stability of the charge-ordered ($\text{CO}$) state were studied by measurements of powder x-ray diffraction, resistivity, and ultrasound for ${\text{Pr}}_{1\ensuremath{-}x}{\text{Ca}}_{x}{\text{MnO}}_{3}$ $(0.5\ensuremath{\leqslant}x\e…
The relaxation of the metastable state of the spin-crossover compound [Fe(L)(2)](ClO(4))(2).H(2)O, with L = 2,6-bis(pyrazol-1-ylmethyl)pyridine, populated by the LIESST (light induced excited spin state trapping) effect, has been investigated by magnetic measurements. The time dependence of the relaxation curve at sev…
Tyrosine hydroxylase (TyrH), the catalyst for the key regulatory step in catecholamine biosynthesis, is phosphorylated by cAMP-dependent protein kinase A (PKA) on a serine residue in a regulatory domain. In the case of the rat enzyme, phosphorylation of Ser40 by PKA is critical in regulating the enzyme activity; the e…
Carbon nanotubes are an intriguing new form of carbon, comprising molecular-scale cylinders of nanometer diameter and micrometer to centimeter lengths. They exhibit many extraordinary mechanical and electrical properties and have a wide variety of anticipated applications. However, to realize these potential applicati…
This work describes the simulation of the effects of GIC (Geomagnetically Induced Currents) in a power system using a new transformer model. The simulation studies demonstrate that it is important to accurately model the remanence effects in the core of the power transformer.
Abstract Through considering the packing density and the lattice contraction of Goldschmidt's premise, volume changes of elements crystals with different structures on melting are modeled. It is found that the predictions of the model are in agreement with the experimental and other theoretical results. In addition, t…
Hexagonal and cubic polytypes of bulk gallium nitride powders are characterized by 69,71Ga and 14N MAS NMR at 11.7 T. The (corrected) 71Ga chemical shifts are 333.0 and 357.5 ppm, respectively; the corresponding 14N chemical shifts are -301.8 and -297.0 ppm (all shifts referenced to 1 M gallium nitrate). The 69,71Ga n…
The discrepancy seen in the experimental and theoretical results on the magnetic moment of a small magnetic cluster has been attributed to the contribution arising from orbital magnetism. In this Letter we show that the magnetic states with large orbital magnetic moment are not always energetically favorable; they cou…
Abstract The electrical conductivities of a series of MoS 2 ‐organic layer nanocomposites prepared by the intercalation of donors like poly(ethylene oxide) and secondary amines are compared. Although for intercalated MoS 2 species a metallic behavior is expected, the products behave as semiconductors probably because…
Paramagnetic diruthenium(III) complexes (acac)(2)Ru(III)(mu-OC(2)H(5))(2)Ru(III)(acac)(2) (6) and [(acac)(2)Ru(III)(mu-L)Ru(III)(acac)(2)](ClO(4))(2), [7](ClO(4))(2), were obtained via the reaction of binucleating bridging ligand, N,N,N',N'-tetra(2-pyridyl)-1,4-phenylenediamine [(NC(5)H(4))(2)-N-C(6)H(4)-N-(NC(5)H(4))…