The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform
Koji Kato - One of the best experts on this subject based on the ideXlab platform.
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Effect of arc discharge on the wear rate and wear mode transition of a Copper-impregnated metallized carbon contact strip sliding against a Copper Disk
Tribology International, 1999Co-Authors: Shunichi Kubo, Koji KatoAbstract:Wear of the contact strip on the pantograph of electric railway vehicles is governed mainly by arc discharge occurring simultaneously with break of contact between the strip and trolley wire. As a step to clarify the wear mechanism of metallized carbon contact strips under the occurrence of contact break arc discharge, a detailed sliding wear test of 30 min duration was carried out for the combination of a Copper-impregnated carbon strip and a Copper Disk at a sliding speed of 100 km/h. The worn surfaces of the strip and Disk were observed every 5 min. The voltage drop and electric current were measured throughout the test, and the occurrence and energy of the arc discharge were evaluated for each revolution of the Disk. The wear process is considered in terms of the wear mode transition, and the effect of arc discharge on the mode transition and wear rate of the strip is discussed.
Shunichi Kubo - One of the best experts on this subject based on the ideXlab platform.
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Effect of arc discharge on the wear rate and wear mode transition of a Copper-impregnated metallized carbon contact strip sliding against a Copper Disk
Tribology International, 1999Co-Authors: Shunichi Kubo, Koji KatoAbstract:Wear of the contact strip on the pantograph of electric railway vehicles is governed mainly by arc discharge occurring simultaneously with break of contact between the strip and trolley wire. As a step to clarify the wear mechanism of metallized carbon contact strips under the occurrence of contact break arc discharge, a detailed sliding wear test of 30 min duration was carried out for the combination of a Copper-impregnated carbon strip and a Copper Disk at a sliding speed of 100 km/h. The worn surfaces of the strip and Disk were observed every 5 min. The voltage drop and electric current were measured throughout the test, and the occurrence and energy of the arc discharge were evaluated for each revolution of the Disk. The wear process is considered in terms of the wear mode transition, and the effect of arc discharge on the mode transition and wear rate of the strip is discussed.
A. Pandey - One of the best experts on this subject based on the ideXlab platform.
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Some Studies into Electrical Discharge Machining of Nimonic75 Super Alloy Using Rotary Copper Disk Electrode
Journal of Materials Engineering and Performance, 2013Co-Authors: S. Singh, A. PandeyAbstract:The present study reports the rotary Disk electrical discharge machining of Nimonic75 super alloy, extensively used in aerospace industries. The experiments have been performed using Taguchi’s orthogonal array L18 (2^1 × 3^5) with Copper Disk electrode. The control factors considered were, viz., peak current, pulse on time, pulse off-time, gap voltage, and rotational speed of Disk electrode with three levels each, and aspect ratio (AR) of the Disk electrode having two levels, as noise factor. The novel approach of this article is to study the effect of the AR of the Disk electrode on the performance measures, viz., material removal rate, Disk electrode wear rate, and surface roughness. The results based on Taguchi’s analysis show that among the considered process parameters, the AR and peak current significantly affect the machining characteristics. Furthermore, the rotating Disk electrode easily flushes off the debris, resulting in better machining and reducing the chances of re-solidified layer formation.
Ali M Abdelaziz - One of the best experts on this subject based on the ideXlab platform.
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low cost chemical oxygen demand sensor based on electrodeposited nano Copper film
Arabian Journal of Chemistry, 2015Co-Authors: Hamdy H Hassan, Ibrahim H A Badr, Hesham T M Abdelfatah, Esmat M S Elfeky, Ali M AbdelazizAbstract:Abstract A commercially available Copper electrical cable and pure Cu Disk were used as substrates for the electrodeposition of Copper nanoparticles (nano-Cu). The surface morphology of the prepared nano-Cu/Cu electrodes was investigated by scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX). The bare Copper substrates and the nano-Copper modified electrodes were utilized and optimized for electrochemical assay of chemical oxygen demand (COD) using glycine as a standard. A comparison was made among the four electrodes (i.e., bare and nano-Cu coated Copper cable and pure Copper Disk) as potential COD sensors. The oxidation behavior of glycine was investigated on the surface of the prepared sensors using linear sweep voltammetry (LSV). The results indicate significant enhancement of the electrochemical oxidation of glycine by the deposited nano-Cu. The effects of different deposition parameters, such as Cu 2+ concentration, deposition potential, deposition time, pH, and scan rate on the response of the prepared sensors were investigated. Under optimized conditions, the optimal nano-Cu based COD sensor exhibited a linear range of 2–595 mg/L, lower limit of detection (LOD) as low as 1.07 mg/L ( S / N = 3). The developed method exhibited high tolerance level to Cl − ion where 1.0 M Cl − exhibited minimal influence. The sensor was utilized for the detection of COD in different real water samples. The results obtained were validated using the standard dichromate method.
Hongyuan Chen - One of the best experts on this subject based on the ideXlab platform.
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simultaneous determination of purine bases ribonucleosides and ribonucleotides by capillary electrophoresis electrochemistry with a Copper electrode
Journal of Chromatography A, 1997Co-Authors: Hua Lin, Hongyuan ChenAbstract:Abstract Simultaneous determination of purine bases, ribonucleosides and ribonucleotides was achieved by coupling capillary electrophoresis (CE) with wall-jet amperometric detection. A 200 μm diameter Copper Disk electrode was applied at working potential, +0.65 V vs. saturated calomel electrode. The current response of high sensitivity and stability was obtained in strong basic solutions which were suitable for satisfactory CE separations. The calibration curve was linear over 2–3 orders of magnitude and the limits of detection for adenine, guanine, xanthine, uric acid, adenosine, guanosine, adenosine-5′-monophosphate and guanosine-5′-monophosphate were below 9 fmol (S/N=3). The use of this method for the separation and detection of compounds present in human plasma samples was reported.