Materials Literature
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Structural and magnetic properties of La0.2Ca0.8MnO3 nanoparticles with average size of 15-37 nm, prepared by the glycine-nitrate method, have been studied. Synchrotron experiments performed in the temperature range of 80-300 K have shown that a structural transition from room temperature orthorhombic Pnma to monoclin…
Hardly a month goes by within the scientific literature without some new material “X” being reported as a suitable material on which to grow cell type “Y”, for the potential purpose of treating disease “Z”. Thus when fibroin, a protein found in silk, was first proposed as a biomaterial for cell growth [1] it joined a…
The article presents the results of attempts made to develop a non-invasive diagnostic method of a technical state of a transformer's core based on an analysis of mechanical vibrations registered during the start-up of the transformer analyzed. The paper presents a characteristic of the transformer under study, the me…
There are several studies on the morphology of zinc oxide (ZnO) in the photocatalytic elimination of organic pollutants, but few studies focus on the simultaneous effect of different operating parameters. Most studies have been carried out by unifactorial experiments, which is inefficient. For this reason, in this stu…
This paper reports on the construction of a nano-electro-mechanical system (NEMS) tunable color filter based on a subwavelength grating with high color uniformity and a low drive voltage. We recently proposed a ground-voltage-ground (GVG)-type tunable color filter with a parallel-plate actuator with three pairs of ele…
Ferromagnetic resonance (FMR) spectroscopy, x-ray magnetic circular dichroism (XMCD) spectroscopy and magnetic transmission soft x-ray microscopy (MTXM) experiments have been performed to gain insight into the magnetic anisotropy and domain structure of ultrathin Co|Ni multilayer films with a thin permalloy layer unde…
In this paper, we investigated the Ga incorporation effect in InAl(Ga)N/Al(Ga)N/GaN heterojunctions grown by a close coupled showerhead metal–organic chemical vapor reactor and proposed a grading growth strategy, where the indium composition was graded from Al(Ga)N to InAl(Ga)N, to mitigate the deleterious effect of G…
Plasma electrolytic oxidation (PEO) is the new, environmentally and cost-effective method for coating the metals. This method vastly has been studied for coating Aluminum, Titanium and Magnesium and their alloys and recently for steel. In present study, Ck45 steel samples were coated by PEO method in order to improve…
This paper proposes an enhanced control strategy for three-phase unified power quality conditioners (UPQCs) under the distorted source and nonlinear load conditions. The proposed controller consists of a proportional-integral and a repetitive controller (RC), which is developed on both the series and the shunt APFs of…
Parameter identification for the dynamic model of an induction motor is evaluated, taking into account the magnetic saturation curve. The identification scheme is based on a Particle Swarm Optimization algorithm to fit the motor and model startup stator currents curves. Two different strategies are compared. The first…
This paper provides a manner for calculating the equivalent circuit parameters of a three-phase squirrel cage rotor type induction motor. All the electrical parameters of stator and rotor have been calculated. The core and magnetizing losses also determined in order to calculate the magnetizing circuit parameters. A 2…
Two new malonato-bridged copper(II) complexes of the composition [Cu 2 (mal) 2 (datz) 2 (H 2 O)]·5H 2 O ( 1 ) and [Cu 2 (mal) 2 (atz) 2 (H 2 O)]·3H 2 O ( 2 ) (mal = malonate, atz = 4-amino-1,2,4-triazole, datz = 3,5-diamino-1,2,4-triazole) are prepared and characterized by X-ray crystal structure determination and mag…
A novel phthalocyanine bearing oxygen donor atoms on the peripheral positions has been synthesised by cyclotetramerisation of ( E)-4-(4-cinnamoylphenoxy) phthalonitrile and its nickel, zinc, cobalt, copper and lead derivatives prepared. The thermal stabilities of the phthalocyanine compounds have been determined and t…
In-depth understandings of crystal growth mechanisms and kinetics provide guidance to tune the crystal growth and thus to achieve new types of nanostructures and new material properties. The common mechanisms to describe crystal growth is based on the Ostwald ripening (OR) theory and the newly discovered oriented atta…
In ceramic decoration by xerography, once the toner particles have been deposited, the substrates need to be subjected to thermal treatment at temperatures above 600∘C to eliminate the organic constituents and enable the inorganic constituents to be integrated into the ceramic surface. The inorganic component includes…
A type of smart thermochromic filament has been developed, composed of 35% UMB Blue and 65% polypropylene. It was able to change colour between white and blue depending on the temperature. A set of examinations including DSC, SEM, XRD, FTIR and tensile strength test, has been carried out to study the properties of the…
The influence of rotational isomerism on the two-photon absorption (TPA) of FTC chromophores has been investigated using the quadratic response theory with the B3LYP functional. Eight rotamers induced by three rotatable single bonds in the molecule are fully optimized, and it is found that their conformational energie…
Self-collimation characteristics of the two-dimensional square-lattice photonic crystal (PC) consisting of metal rods immersed in silicon are studied by the finite-difference time-domain method. The Drude dispersion model is adopted to describe the metal rod, and the self-collimation behaviours of the near-infrared li…
The aim of this work is to evaluate the influence of fabrication methods on the compressive properties of sandwich composites using both experimental work and numerical simulations. Two types of sandwich composites with E-glass/Kevlar/polyester resin facings and Endgrain balsa wood as core have been produced by vacuum…
We investigate the mechanism for the improvement of p-type doping efficiency in Mg-Al 0.14 Ga 0.86 N/GaN superlattices (SLs). It is shown that the hole concentration of SLs increases by nearly an order of magnitude, from 1.1 × 10 17 to 9.3 × 10 17 cm −3 , when an AlN interlayer is inserted to modulate the strains. Sch…