Materials Literature
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This study presents a new approach that uses a genetic algorithm (GA) to optimize the arrangement of two-stage thermoelectric coolers (TECs). Three practical configurations of two-stage TECs, 1) with two stages electrically connected in series, 2) with two stages electrically separated from each other and 3) with two…
By adding 3% Ca in AZ91D, the reticular phase on grain boundaries formed and the corrosion rate decreased to 14.1% of the AZ91D corrosion rate in NaCl solution. The corrosion morphologies showed that the reticular phase effectively confined the development of corrosion from grain to grain and hence significantly reduc…
Thermally stimulated discharge (tsd) current technique has been used to investigate the corona polarized pristine and swift heavy ion irradiated kapton-H polyimide. The samples of thickness 25 μm were irradiated with 100 MeV Fe+ beam (fluence: 1.8 × 1011, 2.3 × 1012 and 1.4 × 1013 ions/cm2). Corona charged pristine ka…
Alginate is a polysaccharide that is a block polymer consisting of block units of guluronic acid and mannuronic acid. It shows inherent biological affinity for a variety of enzymes such as pectinase, lipase, phospholipase D, a and ss amylases and glucoamylase. Taking advantage of its precipitation with Ca2+ and the ab…
The aim of this study is to systematically investigate the elastic behavior with deformation of the binary titanium alloys of Ti-Mo, Ti-Nb and Ti-V. The stress-strain curve using cyclic load-unloading tensile test of alloys composed of α″ martensite, e.g. 20Nb and 8Mo, showed the peculiar pseudo-elastic behavior. A li…
Talc, calcium carbonate (CaCO3), and kaolin hold considerable promise in the development of polymer composites for good mechanical properties and stability. Comparative studies on the usage of these minerals as single fillers in polypropylene (PP) have shown varying degrees of reinforcement due to their differences in…
Different spinning mills use different raw materials, processing methodologies, and equipment, all of which influence the quality of the yarns produced. Because of many variables, there is a difficulty in developing a universal empirical/theoretical model. This work presents a multilayer perceptron algorithm (MLP) mod…
Multiferroic Bi Fe O 3 -based thin films were heteroepitaxially grown on La Ni O 3 ∕ La Fe O 3 ∕ Mg O ( 001 ) substrates by radio frequency magnetron sputtering. The epitaxial BFO-based films were grown with pure perovskite phase and a cube-on-cube relationship at a low processing temperature of 450 ° C . The partial…
Silicon nitride ceramics are used under conditions were high strength, hardness and wear resistant is necessary. The increasing use of Si3N4-ceramics as ceramic ball bearings and valves in chemical apparatus demand an understanding of the relations between microstructure and corrosion behaviour of silicon nitride cera…
Purpose To make easier and faster the designing of transformers using scale models. Design/methodology/approach The scale modeling in designing of transformers is included. Both computer and physical models of high leakage reactance (HLR) and 3-phase (TP3C) transformers have been considered. The 3D field computations…
Purpose To develop a homogenization technique to directly and efficiently take the eddy current effects in laminated magnetic cores within time domain finite element (FE) analyses. Design/methodology/approach The technique is developed for being used within a 3D magnetodynamic b ‐conform FE formulation, e.g. using a m…
Single-phase of was synthesized by citric-gel processing and photoluminescence (PL) properties in the range of were investigated. The bands below with maxima at approximately in excitation spectra were assigned to the host lattice absorption, the bands above with a maximum at about 235 and in and , respectively, corre…
Abstract Although metamaterials and so-called left-handed media have originated from theoretical considerations, it is only by their practical fabrication and the measurement of their properties that they have gained credibility and can fulfil the potential of their predicted properties. In this review we consider som…
It is demonstrated that icosahedral carbon nanoparticles in which the local environment of carbon atoms is virtually identical to the local environmental of carbon atoms in a diamond can be formed in the nanosize range. The general principle that governs the formation of structures of icosahedral diamond-like nanopart…
Symmetrical dialkyl trithiocarbonates were obtained from various alkyl halides with an equivalent of carbon disulfide and cesium carbonate in polar aprotic solvents, although the conventional synthesis of trithiocarbonates had required large excess amount of carbon disulfide. This reaction proceeds under ambient condi…
This paper deals with the dynamic modeling of a hydrogen production system using gPROMS. The model includes mass balances, liquid-gas equilibrium relations, mass transfer laws and kinetic reaction equations. The initial reaction mixture is a sodium borohydride solution that reacts via a self-hydrolysis mechanism in th…
In addition to the conventional measurements of partial discharges (PD) recommended in IEC 60270, currently non-conventional PD detection methods are increasingly used, such as the electrical PD detection in the HF / VHF / UHF range as well as the employment of acoustic, optical and chemical procedures. All these meth…
The dimensional stability of wood and its resistance to decay and fire can be improved by depositing inorganic materials in the wood matrix and forming wood-inorganic composites. In this paper, four novel wood-inorganic (aluminum) composites were developed. The composites are referred to according to the oxy-aluminum…
Nanocrystalline ceria powders have been synthesized by combustion technique using citric acid as a fuel and nitrate as an oxidizer. The auto-ignition of the gels containing cerium nitrate and citric acid resulted in ceria powders. A theory based on adiabatic flame temperature for different citric acid-to-cerium nitrat…
By measurements of the contact angle with water(W),glycerol(G),formamide(F), diiodomethane(D) and ethylene glycol(E) on polypropylene(PP),polyethylene(PE),polyvinyl chloride(PVC),polystyrene(PS),poly(ethylene terephthalate) (PET),acrylonitrile-butadiene-styrene(ABS) and polycarbonate(PC),the Lifshitz-van der Waals and…