Materials Literature
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In this work, we demonstrate that cuprous oxide Cu(2)O nanospheres with hollow interiors can be fabricated from a reductive conversion of aggregated CuO nanocrystallites without using templates. A detailed process mechanism has been revealed: (i) formation of CuO nanocrystallites; (ii) spherical aggregation of primary…
This paper reports on space charge dynamics in XLPE samples, which have been pre-stressed under ac electric stress, when subjected to 30 kV/sub dc//mm dc electric stress for 24 hours. The samples used for this study were planar XLPE samples of /spl sim/220 /spl mu/m thick aged under 30 kV/sub pk//mm, 30 kV/sub rms//mm…
Abstract The dielectric spectroscopy of metal–metal sulfate LiRbSO 4 samples are described with particular emphasis on sensor performance to be used in the field of radiation. The obtained results as the effect of different electron energy beams at fixed dose, 0.5 Gy, showed abrupt change of the electrical properties…
Based on the simulation of ultraviolet (UV) radiation in the Sun's rays and in corona, the aging effect of UV radiation on composite insulators was studied in this paper, especially the effect on hydrophobicity properties. It is found that after irradiation with UV, no matter whether a short time of less than 24 hours…
The capacitance–voltage and current–voltage properties of the samples before and after annealing are investigated at 300 K and 195 K. It is found that the interface charge plays an important role for the heterojunction properties. After annealing, the samples exhibit typical junction properties. The heterojunction sho…
The angular and velocity distributions of desorbing products were analyzed in the course of a catalyzed N 2 O + CO reaction on Pd(110). The reaction proceeded steadily above 450 K, and the N 2 desorption merely collimated sharply along 45° off the surface normal toward the [001] direction. It is proposed that this pec…
Abstract Resistivity of cold‐pressed CrO 2 powder has been measured over the temperature range of 2 to 350 K with a magnetic field up of to 50 kOe. High resolution transmission electron microscopy (HRTEM) images show that the CrO 2 particles are needle‐shaped with an aspect ratio of 7:1 and have an average length of 2…
We report on the progress of a recent addition to non-volatile solid state memory technologies suited for space and other ionizing radiation environments. We summarize the material and processing science behind the current generation of chalcogenide phase-change memories fabricated on CMOS structures. The chalcogenide…
The thermal conductivities of resins can be improved by introducing a high-order structure having microscopic anisotropy while maintaining their macroscopic isotropy. We studied four kinds of diepoxy monomers with a biphenyl group or two phenyl benzoate groups as mesogens, and cured them thermally with an aromatic dia…
Abstract Lithium‐doped strontium fluoride crystals were successfully colored electrolytically, and a lot of F, M (F 2 ), M + (F 2 + ) and unidentified color centers were effectively produced in the colored crystals, which should mainly benefit from the appropriate impurity doped in the crystals, coloration temperature…
Density-functional theory calculations, within the plane-wave-ultrasoft pseudopotential framework, were performed in the ⟨110⟩ projection for MgO and for the coherent {111} $\mathrm{Ag}\ensuremath{-}\mathrm{Mg}\mathrm{O}$ polar interface. First-principles calculations were incorporated in high-resolution transmission…
Electrical conduction of crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR) is studied by means of DC charging current measurements. The threshold for space charge accumulation and the DC conductivity of XLPE and EPR have been investigated at different electric fields and at different temperatures. Cu…
Antiferroelectric (Pb,La)(Zr,Sn,Ti)O3 thin films have been fabricated on LaNiO3∕Pt∕Ti∕SiO2∕Si and Pt∕Ti∕SiO2∕Si substrates by a sol-gel processing technique. The films grown on LaNiO3-buffered silicon substrates showed a dense columnar microstructure and were highly (100)-oriented while those grown on Pt-buffered sili…
Calcium-dependent changes in the internal dynamics and average structures of the opposing globular domains of calmodulin (CaM), as well as their relative spatial arrangement, contribute to the productive association between CaM and a range of different target proteins, affecting their functional activation. To identif…
A lyotropic liquid crystal (LLC) monomer was successfully blended and cross-linked with commercial butyl rubber (BR) to afford ordered, nanoporous polymer composites. These materials retain much of the excellent chemical resistance of BR but also provide a measure of water vapor permeability, which is lacking in pure…
The magnetic phase transitions in the $\mathrm{Fe}\mathrm{Mn}{\mathrm{P}}_{1\ensuremath{-}x}{\mathrm{As}}_{x}$ compounds with $x=$ 0.25, 0.35, 0.45, 0.50, and 0.55, have been studied by iron-57 M\"ossbauer spectroscopy. The ferromagnetic and antiferromagnetic spectra have been analyzed with a model that takes into acc…
This work concerns phase thermal stability in (001)-cut $\mathrm{Pb}{({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3})}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ crystals after an electric $(E)$-field poling, which is crucial for piezoelectric applications. Dielectric properties have been measured as functions of Ti…
Herein, we report the insulation properties of an epoxy-layered silicate nanocomposite, prepared by dispersing modified layered silicates in an epoxy resin. This nanocomposite has an intercalated structure formed by the insertion of resin molecules into the spaces between each silicate layer, and it has higher insulat…
Ethylene propylene diene rubber (EPDM), silicone rubber (SIR) and their alloys have good performance when used as outdoor insulators. The hydrophobicity of the surface is maintained in wet and polluted conditions as a result of the presence of silicone fluid on the surface. This is sustained by the diffusion of low mo…
Recently, the demands for generators with large capacity are increasing in the market, and their rated voltage has been heightened accordingly. Therefore, it is required to manufacture high voltage stator windings to improve the quality of the insulation system and to strive for a long-term life. On the grounds of the…