Materials Literature
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Oil-paper is the main insulation of Oil-immersed power transformers. Reflecting the deterioration of insulation effectively, partial discharge (PD) has become one of the significant means to estimate the insulation condition of power transformers. Surface discharge is one of the most important type of PD. Studying the…
The charge on a conducting particle in an infinite uniform field or standing on a ground plane in a uniform background field is important to a range of technical areas, such as particle motion in gas-insulated substations. This charge is normally evaluated based on an approximate formula which is often traced back to…
In this paper, we propose a statistical model to analyze the crosstalk noise induced by process variations on single-walled carbon nanotube (SWCNT). Our approach is based on a closed-form metric, which simplifies the noise peak voltage of SWCNT buses into a linear function of process variations. The methodology is bas…
Experimental results on photoluminescence spectra and kinetics obtained in the studies of SiO 2 oxide layers nanostructured by ion implantation of silicon with subsequent doping and annealing are systematized. It is shown that phosporus doping by ion implantation leads to a severalfold increase in the intensity and de…
The nanocrystalline Y 3 Al 5 O 12 ceramics with different phase compositions, microstructures, and optical characteristics have been prepared by low-temperature consolidation of the Y 3 Al 5 O 12 powder at pressures from 6 to 7.7 GPa in the temperature range from 250 to 550°C. The conditions have been defined for obta…
The effect of edge carbon atoms in graphene islands grown on a metal surface on the kinetics of nucleation, growth and dissolution of these islands, as well as of a multilayer graphite film, has been analyzed. It is shown that the part played by edge atoms should be taken into account in description of equilibrium pro…
Hg 2 2+ ion and 5,10,15,20-tetrakis(parasulphonato-phenyl)porphyrin anion can form 2:1 (2 clusters:1 porphyrin) and 2:2 complexes, while the formation of the 1:1 species is not observable: it is only an intermediate, similarly to the cases of other large metal ions of small charge-density. The differences between merc…
Bis(N,N-dimethylamino)methane has been shown to be a convenient reagent for the aminomethylation of chlorophyll a derivatives. Methylpheophorbide a (in enol form) and chlorin e 6 13-amides were aminomethylated with bis(N,N-dimethylamino)methane. Reactivity of methylpheophorbide a exo-ring and chlorin e 6 13-amides vin…
In this paper, we propose a circuit model of the multi-walled carbon nanotube (MWCNT) based on our one-dimensional fluid model, which describes the electron transport in single-walled carbon nanotube (SWCNT). The performances of MWCNT and SWCNT in high frequency (RF/microwave) applications are then simulated using the…
The liquid crystalline (LC) behavior of a literature-reported asymmetric azomethine compound (4-[4-(n-butyloxy)-benzylideneimino]-chlorobenzene, Cl.O4) was investigated by using optical polarized light microscopy, differential scanning calorimetry and medium-wide angle X-ray diffraction. FTIR in attenuated total inter…
Five surface-treatment methods for working rollers are compared: shot blasting, electrical-discharge texturing, laser treatment, and electron-beam texturing, as well as the Topocrom method, in which a chromium layer is applied to the roller surface. These methods are used to ensure standard surface microtopography in…
The Eu2+-activated Sr2Mg3P4O15 (Sr2Mg3P4O15:Eu2+) phosphor is prepared using solid-state reactions of SrCO3, MgO, (NH4)2HPO4, and Eu2O3. The phosphor is excited efficiently by near-ultraviolet (n-UV) light irradiation, showing bright blue emission spectra at wavelengths of 400–550 nm with a maximum peak of 447 nm. The…
The transport and magnetic properties of Mn x Si1 − x films with a high (x ≈ 0.35) content of Mn produced by laser deposition at growth temperatures of 300–350°C have been studied in a temperature range of 5–300 K in magnetic fields of up to 2.5 T. The films exhibit a hole-type metallic conductivity and a relatively w…
Noncentrosymmetric crystals of iodates and titanates have been systematized, and the principles of the design of new nonlinear optical materials by means of revealing empirical composition-structure-property relationships have been considered. It is demonstrated that, in the diagram of chemical bond lengths, noncentro…
The incorporation of synthetic silica nanoparticles into polypropylene is shown to increase the ac breakdown strength compared to unfilled material. This breakdown strength stays unchanged during application of a 40 kV/mm dc field for up to 500 h at both, room temperature and 90°C. Dielectric spectroscopy shows an inc…
Abstract The interest in cellulose produced by bacteria from surface cultures has increased steadily in recent years because of its potential for use in medicine and cosmetics. Unfortunately, the low yield of this production process has limited the commercial usefulness of bacterial cellulose. The aim of this paper is…
Prehnite from the Jeffrey mine, in Asbestos, Quebec, has been investigated by optical microscopy, electron-microprobe analysis, single-crystal X-ray-diffraction (XRD) analysis, and electron paramagnetic resonance (EPR) spectroscopy. Electron-microprobe analyses yield an average iron content of 0.053(34) wt% Fe 2 O 3 ;…
Samples of α-Al2O3:Mg were obtained using polymer calcination method, with five different concentrations of magnesium. ICP-AES analysis showed the magnesium concentrations to be: 0.47, 0.88, 1.33, 2.61 and 3.36 mol%. Scanning Electronic Microscopy (SEM) indicated the occurrence of a nanometric layer over the α-Al2O3 c…
Article Moisture pickup in calcium carbonate coating structures: role of surface and pore structure geometry was published on August 1, 2009 in the journal Nordic Pulp & Paper Research Journal (volume 24, issue 3).
The composite films of ferroelectric potassium nitrate (KNO3):poly(vinyl alcohol) (PVA) with different weight percentages of KNO3 have been prepared at 200 degrees C using the spray-deposition technique. The remanent polarization (Pr) and peak current density for all composite films was estimated by tracing the polari…