Materials Literature
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The study presents the results of experimental investigation of finding out the limit concentrations of DBDS and sulfur mercaptan for safe and prolonged operation of power transformers in the local environmental conditions of Saudi Arabia. For experimental investigation of limit concentrations of DBDS and sulfur merca…
In this work, the effect of the power supply (frequency, waveform and power), size of the electrodes and filling gas pressure on the optical emission and electrical characteristics from Dielectric Barrier Discharge (DBD) flat lamp was investigated.
Recently, resistive random access memory (RRAM) using various metal oxides (i.e., SiO2[1], HfO2, NiO[2], Al2O3, NbO) have attracted a lot of attentions since the current nonvolatile memory (NVM) approaching the scaling limits. Meanwhile, the selector devices are essential to address the sneak path issue which causing…
The inherent reactivity of the Al–Cu alloys is such that their use for structural, marine, and aerospace components and structures would not be possible without prior application of a corrosion resistance system. Historically these corrosion resistance coatings were based on the use of chemicals containing Cr (VI) com…
The emerging field of “topological spintronics” is rooted in the recent realization that narrow band gap semiconductors such as the Bi- and Sb-chalcogenides support two dimensional (2D) helical Dirac fermion surface states characterized by a spin-texture in momentum space [1,2]. Spin- and angle-resolved photoemission…
Recently, non-contact radio-frequency (RF) methods have shown promising potential to be used as a complement to the IEC 60270 standard method for the detection and localization of partial discharge (PD) in high voltage insulation. This paper reports the results of an experimental investigation on the characteristic of…
In this paper, experimental results of a diagnostic measurement method for power cables will be presented. This new method uses travelling waves and their interference characteristics to generate local energy losses inside the test object. This losses can be measured and give a qualitative indication of the local phys…
Transformer is the key electric installation in power system. Dissolved gas Analysis ( DGA ) on-line monitoring technique can discover early faults of transformer by analyzing the concentration of dissolved gas in transformer oil[1][2]. However, the on-line system can't monitoring the status of transformer accuracy in…
Different organic compounds are evaluated to form back contact for CdTe photovoltaics (PV) and to study the effect of band alignment. CdTe devices with CdS n-type window layer were fabricated using closed space sublimation (CSS) and organic back contact layers were deposited using dip coating. In order to prepare phot…
Photoluminescence properties of gallium nitride-based thin films directly grown on an amorphous quartz glass substrate are investigated. The films are grown by a molecular beam epitaxy apparatus having dual radio-frequency nitrogen plasma cells. Effects of impurity doping, and/or a small amount of indium incorporation…
This study develops a technique for rotation control of spherical motors driven by electromagnetic forces. The technique uses the data of generated torque per unit current and cogging torque of an electromagnet that are obtained beforehand at relative positions between the electromagnet and the rotor. An electromagnet…
This article consists of a collection of slides from the author's conference presentation on high-speed flux-switching permanent magnet machines.
We present a study of metalorganic vapour phase epitaxy of ternary InAsP quantum dots on AlGaInP/GaAs. The properties of InAsP QD laser structures were compared with reference samples containing binary InP QDs. Based on X-ray diffraction, the molar fraction of As in InAsP QDs was estimated to be ~25%. Room temperature…
This paper describes breakdown characteristics of AlGaN/GaN high electron mobility transistors (HEMTs) with multi-finger gate patterns. We studied the spatial profile of electroluminescence (EL) from AlGaN/GaN HEMTs under high drain and near pinch-off gate bias. As a result, different EL emission profiles and breakdow…
The influence of metalloporphyrazins on the kinetics of oligodimethylsiloxandiols structuring by esters of orthotitanic acid was studied. The properties of the protective materials with oligodimethylsiloxandiol cover was investigated.
Graphene is suitable material for keeping electron spin states and expected for spintronics devices because of weak spin-orbit interaction and weak nuclear spin interaction. From this reason spin-correlation phenomena are investigated in graphene. Kondo effect is forming spin singlet state between electrons in leads a…
By employing dynamic Monte Carlo simulations, we investigate a coil-to-toroid transition of self-attractive semiflexible polymers and the spatial distributions of nanoparticles in self-attractive semiflexible polymer/nanoparticle composites. The conformation of self-attractive semiflexible polymers depends on bending…
Abstract In stainless steels, microstructural damage is caused by precipitation of chromium carbides or sigma phase. These microconstituents are detrimental in stainless steel welds because they lead to weld decay. Nevertheless, they are prone to appear in the heat affected zone (HAZ) microstructure of stainless steel…
This paper presents one of the methods for estimation of the electromagnetic excitation force of the motor. In order to identify the excitation force of the motor, vibration data was obtained using phase reference spectrum to overcome a number of channels of the DAQ instrument. FE model of the 200kW motor was made to…
This paper investigates the effect of rotating eccentricity fault on a 10/12 Flux Switching Permanent Magnet (FSPM) machine. Main characteristics of the studied machine such as air-gap flux density, magnetic force between rotor and stator and torque profile are calculated by using finite element analysis (FEA) which i…