Materials Literature
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This paper reports on the hairiness reduction of polyester yarns at winding using air-nozzles. Three yarns of the same count were spun each from fibres of 1.0, 1.2 and 1.4 deniers respectively. Using a CFD (computational fluid dynamics) model, airflow inside the nozzles is simulated to explain the role of nozzle param…
Using first-principles calculations, we have studied successive adsorption of hydrogen atoms on a sp2-bonded boron nitride graphitic sheet. Our calculations show that clustering proceeds through the creation of contiguous H-H orthodimer structures stabilizing the H adsorbate cluster on the BN(0001) surface, leading ev…
A commercial alumina nanopowder has been applied to prepare high density alumina ceramic specimens using a simple slip casting method. Slurry preparation process is one of important steps to enhance density and optical property of alumina specimens to be fabricated. In this work, the effect of the amount of ammonium s…
A despolimerização do poli (tereftalato de etileno) - PET pós-consumo, em solução aquosa 7,5 mol.L-1 de hidróxido de sódio foi testado a 100 °C e a 1 atm, com objetivo de obter o ácido tereftálico. O efeito de tensoativos e da concentração da solução sobre o rendimento da despolimerização foi estudado quantitativament…
film phosphors have potential applications as red components in flat display and lighting devices. In this study, we investigated the parameters affecting the internal extraction efficiency and thickness of film phosphors with a view to optimizing their brightness. film phosphors were grown on both quartz and sapphire…
From leather science, a deeper understanding of the theoretical basis of the tanning mechanism has unified the inorganic and organic chemistries of leather making processes. The 'link-lock' mechanism provides an explanation of present reactions and a tool for future developments. The question now posed is: where does…
A conceptual design study for a pyroprocesing facility, has been carried out in this study, which is available for the recovery of uranium and transuranic elemental group(TRU), that is, reusable as a nuclear fuel especially in a next generation-type reactor. The scale of this facility has been chosen as 20 kg HM/batch…
Partitioning and/or transmutation (PT) technology affects the disposal concept of high-level radioactive waste (HLW). We studied how cooling in the predisposal storage period may affect the design of the emplacement area in a repository for radioactive wastes produced by a light-water-reactor nuclear system that uses…
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Diverse carbaporphyrinoid systems have been synthesized using ‘3 + 1’ MacDonald condensations, LindseyRothemund reactions and other strategies. In common with the N-confused porphyrins (NCPs), these compounds have a CNNN core that can facilitate the generation of organometallic derivatives. Benzocarbaporphyrins and tr…
The seismic isolation effectiveness,such as displacement,equivalent horizontal stiffness,max-restoring force,dissipation per loop and equivalent damping ratio of the SMA strands-composite bearing is analyzed and compared with laminate rubber bearing,through the results of the shaking table test on them.Thus the author…
Leather processing is associated with the employment of many kinds of chemicals which may be used to excess. As a result, a part of the chemicals inevitably remain in the tannery wastewater and form major pollutants. Biological treatment plays a significant role in removing these chemicals from wastewater and biodegra…
Purpose: In this research work the results of structure studies for Al0.88Si0.12, Bi0.995Cu0.005, Al0.83Cu0.17 eutectic and Co0.05Cu0.95 peritectic melts have been presented. The structure parameters of molten alloys are compared with ones for liquid pure components and with model values. Design/methodology/approach:…
7.5 mass% TiC and 7.5 mass% W powder blends were densified with Ti-6Al-4V blends by combined cold and hot isostatic pressing (CHIP) method to result in three types of composites with differing processing histories, namely hot isostatic pressing (HIPping), extrusion, and casting, which were compared with their monolith…
Novel organic–inorganic hybrid materials, in the form of bulk materials (powders) and thin films, exhibiting carboxylate functionality have been prepared by sol–gel co-condensation of 11-(triethoxysilyl)methylundecanoate with tetraethoxysilane (TEOS), followed by chemical treatment with AlI3 to convert the ester moiet…
Partial discharge (PD) testing has been used for over 50 years to detect insulation problems in motor and generator stator windings. By periodically measuring the on-line PD activity, usually at least two years warning is given before the risk of stator winding failure is high - which is sufficient time to plan correc…
This paper describes the electrical insulation property of modified superhydrophobic surfaces, which are prepared on epoxy based composites by using special nano-particles. After surface modification the samples exhibit an extreme unwettability with a static contact angle thetasges130deg. In order to investigate the l…
Giant magnetostrictive material (GMM) is gathering more interests due to its superior electromechanical properties. Though the strain of GMM is almost larger than PZT, it still needs to be amplified to match practical demands. A press-bend amplification based giant magnetostrictive actuator (GMA) is designed and the e…
Silicon substrates exposed to laser ablation in a chemically reactive environment such as S F 6 or HCl can experience spontaneous formation of conical pillars. We use these pillars as a template to define the dimensions and order of macropores produced by etching such substrates in aqueous solutions of KOH or tetramet…
This paper reports the progress in the patterning of nonlinear optical crystal lines on a glass surface by laser irradiation techniques. Two techniques for the patterning of crystal lines have been developed, i.e., rare-earth atom heat processing and transition metal atom heat processing, in which continuous-wave lase…