Materials Literature
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The transfer characteristics of zinc tin oxide(ZTO) on silicon dioxide(SiO2) thin film transistor generally depend on the electrical properties of gate insulators. SiO2 thin films are prepared with argon gas flow rates of 25 sccm and 30 sccm. The rate of ionization of SiO2(25 sccm) decreases more than that of SiO2(30…
Abstract Regularities of the catalytic cracking of petroleum fractions in the presence of metal sulfides formed in situ from microemulsion of the “oil fraction–aqueous solution of transition metal salt” type are studied. The conditions of formation of microemulsions containing particles of the dispersed phase with a s…
In this paper, a new AMC checkerboard structure is proposed to reduce radar cross section (RCS). Based on hybrid array pattern synthesis (APS) and particle swarm optimization (PSO) algorithm, the metasurface is optimized to obtain the diffusion scattering patterns. Compared to the equal-sized PEC surface, it can achie…
In this paper, a novel frequency reconfigurable antenna based on Triangular Shaped Fractal Parasitic Elements (TSFPE) has been proposed, by combining fractal techniques with frequency reconfigurable techniques. A pair of RF switches is loaded at the joint between bow-tie antenna and the TSFPE to realize frequency reco…
La gestion à long terme des déchets radioactifs produits dans les centrales nucléaires françaises relève d’un choix politique qui a suscité de nombreuses années de débats. Le Parlement a voté, depuis la fin des années 1980, trois lois permettant de fixer une stratégie nationale.
In this paper, we present for the first time specific methodology and test structures authorizing an accurate analysis of XPS under bias measurements. Such analysis which identifies effective biasing across the device, allows to determine the absolute energy levels of the different layers in the HKMG stack at any bias…
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Within this work, the dechlorination of polyvinylchloride (PVC) chemical as a model by co-milling with eggshell was performed in a planetary ball mill in order to show that mechanochemistry can be utilized for the simultaneous treatment of two wastes, while the products of the treatment can be used in further applicat…
Abstract Certification of new magnetic materials requires high-precision nondestructive methods. The method of measuring the magnetostriction constant of films by studying low-frequency magnetic susceptibility at elastic deformation of the films is proposed. The method allows a tenfold improvement of the accuracy of m…
The aim of this study was to characterize clay from Oza-Nogogo in Delta State for its physical and chemical composition in order to assess its potential industrial applications. The clay samples were collected by means of a plastic shovel and digger, hand-picked to minimize the possibility of contamination and placed…
In this paper, a two-dimensional(2D) hexagonal lattice annular photonic crystal is designed. The band diagram of this photonic crystal is calculated by plane wave expansion method (PWE). The negative refraction phenomenon of photonic crystal is studied by analyzing the band diagram. The finite -difference time - domai…
This work deals with different methods of thermal modelling of the stator winding in a slot. The analyzed machine is a permanent magnet synchronous motor (PMSM). The simplified lumped thermal model and model parameters are described. The finite element methods model is set up by different definitions of the winding in…
Anti-reflection thin films are fabricated on glass substrates using the screen printing method. Tetra ethyl silicate(TEOS) and methyl tri methoxy silane(MTMS) are used as starting materials and buthyl carbitol acetate(BCA) and buthyl cellusolve(BC) are mixed to improve the viscosity of the solution. Anti-reflection th…
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A broadband polarization rotation reflective surface (PRRS) is designed and applied to wideband radar cross section (RCS) reduction in this paper. The PRRS can convert linearly polarized incident wave to reflective wave with orthogonal polarization, and a high polarization conversion ratio (PCR) can be achieved across…
This study was conducted to determine the main elements contents of clay samples collected from different parts of Sudan (Omdurman, Marawi, Blue Nile, Kosti, Umm Ali and Portland cement) using gravimetric and volumetric techniques as classical chemical analysis and compare the results obtained to the X-ray fluorescenc…
Inorganic semiconductor compounds, e.g., CIGS and CZTS, are promising materials for thin film solar cells because of their high light absorption coefficient and stability. Research on thin film solar cells using this compound has made remarkable progress in the last two decades. Vacuum-based processes, e.g., co-evapor…
Abstract The forging tool has its irreplaceable location across a wide range of industrial production including automotive, aviation and bearing industry. The use of forging tools in serial production has led to a huge increase in consumption of forging tools. By following the productivity and economic benefits of usi…
This study set out to modulate and simulate a new quantum dot solar cell GaAs1-xBix/GaAs. In this work, we have treated several phenomena such as: short-circuit current (Jsc), open-circuit voltage (Voc), the Forme-Factor (FF), conversion Efficiency (η) and Quantum Efficiency (EQE) of GaAs1-xBix/GaAs QDSC, for optimiza…
Mesoporous.-alumina was synthesized by the microwave-hydrothermal process with a shorter duration time at 150. C/2 h followed by calcination at 550. C/1 h. Ag nanoparticles (AgNPs) were impregnated into.-alumina under a reducing atmosphere at 450. C. The synthesized product was characterized by X-ray diffraction (XRD)…