Materials Literature
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Short circuit currents or forces during transport can cause mechanical displacements of transformer windings. The transfer function method is presented as a tool to detect these displacements. In order to discover the hidden trouble of the transformer, in this paper, an on-line monitoring system based on FRA method is…
The thermal conductivity of highly porous Si was determined in the temperature range 5-350K. It was found that its temperature dependence is monotonic in the range 20-350K, while below 20K it shows a plateau-like behavior similar to that observed in amorphous materials. The low values of the thermal conductivity of th…
Achieving a high relativity density value in the (K,Na)NbO3 based ceramics is usually quite difficult due to the volatility of alkali elements. A modified two-step sintering technique has been attempted to conveniently fabricate the dense (K,Na)NbO3 based ceramics through the solid state reaction route in this work. T…
Nacre composing the inner layer of mollusk shell is a typical product of biomineralization. While main components of the organics in nacre are proteins, which mediate its distinctive lamellate structure. Although kinds of nacre proteins have been reported, the whole process of nacre formation is still unclear—especial…
The equivalent salt deposit density (ESDD) is an important characteristic of our country which is used to measure insulator deposition level. The contamination of the insulator would reach saturation after a period of time.In order to increase the specific creepage distance, disc suspension porcelain insulator lower s…
The W6Mo5Cr4V2 high-speed steel tool was magnetized by an AC magnetization device which made by ourselves, and the cutting experiments were carried out in a general purpose machine with the magnetized high-speed steel tool and non-magnetized high-speed steel tool. The experimental results indicated that the cutting su…
Top-gate oxide thin-film transistors (TFTs) with the gate-stack structure composed of solution-processed poly-4-vinylphenol (PVP) organic gate insulator (GI) and Al-Zn-Sn-O (AZTO) active channel were fabricated and characterized. It was confirmed that the electrical properties of PVP films were seriously degraded by d…
A Terahertz planar periodic structure (engineered material), which shows several sharp Fano resonances, is introduce. These resonances are due to the small asymmetries of the structure which allow excitation of trapped modes. These sharp resonances can be used for biomedical sensing applications. HFSS simulation resul…
Nowadays, Al2O3-based ceramic coatings have attracted considerable attention for their potential applications as tritium permeation barrier (TPB) in the nuclear reactor. Herein, dense composite ceramic coatings (Al2O3-TiC) have been successfully fabricated by a facile laser-assisted combustion method. The precursor Al…
Using fiber-reinforced composites (FRC) in automotive lightweight construction currently is too expensive to achieve a wide distribution. To assist the engineers’ material selection process suitable information systems are needed. Development of those are a hard task due to the complex structure of FRC. In this paper…
It is found experimentally that as the corona current grows, its radial distribution over the anode narrows and the spot size at the anode decreases. The current-voltage characteristic of a negative corona in argon is approximated by a parabolic function with regard to the experimentally found narrowing of the current…
Tunnel bracket is used in railway tunnel area in order to maintain insulation. Insulator performance evaluation test is proceeded refer to IEC 61109 but it is impossible to reflect all the field condition where insulator installed. Korea has clear four season in climatic condition and peninsula with lots of mountain i…
Photonic band-gap materials have been widely used to mold the flow of light. The scaling property of crystals has allowed studying their behaviour at microwaves, where periodic structures have been profitably adopted to shape the radiation pattern of low-directivity antennas. In particular spatial filters can be achie…
Bismuth oxide was widely studied as an important metal oxide semiconductor. In this paper, a series of α-Bi2O3/Fe2O3 with different contents of Fe2O3 were synthesised using a sol–gel method. The photocatalytic performance of composites powder was evaluated using rhodamine B (RhB) as a model pollutant under visible lig…
We have studied the photoassisted electron emission from a p-type silicon field emitter array under illumination of laser lights with 633 nm and 405 nm wavelengths. The increase of the emission current under light illumination is proportional to the emission current in the dark. The significant influence of the polari…
We report the field-induced surface deformation of Si nano-apex and the achieving of highly reliable gated Si nanoemitters. It was found that the crystalline Si nano-apex deformed to amorphous structure at a low macroscopic field (~0.6 V/nm) with an extremely low emission current (~1 pA). First-principle calculations…
An approach to evaluate harmonic contributions at the point of common coupling is presented in this paper. The proposed approach is based on robust partial least squares regression, which estimates system harmonic impedance by utilizing the signals of harmonic voltage and current measured synchronously at the point of…
The UV-Visible absorption spectroscopy was performed to study the SrTiO3 (STO) single crystals implanted with the fluences of 1.5×1015 and 1.875×1016 Ar+/cm2. The two absorption peaks at 425 and 742 nm were recorded for the low-fluence implanted samples, while the additional peak at 520 nm was measured only for the hi…
Multiwalled carbon nanotube (MWCNT) was subjected a copolymerization reaction with 4, 6-diaminoresorcinol salt (DAR•2HCl) and terephthalic acid (TA) in polyphosphoric acid (PPA) by Friedel-Crafts acylation reaction without any acid treatment or modification. The structure and morphology of the as-prepared poly (p-phen…
The aim of this research is to improve the electrical performance of the nanometer copper film by laser micro shock processing. The nanometer copper film was prepared by the magnetron sputtering. The mechanism of laser micro shock processing effect on electrical resistivity, hardness and elastic modulus was investigat…