Materials Literature
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In order to meet the increasing environmental and economic requirements, commercial aircraft industries have been challenged to reduce fuel consumption, noise and emissions. As a result, more electrical aircraft (MEA), on which engine driven electrical power replaces other primary powers, is being investigated. Howeve…
In this paper the effect of sodium oxide concentration, the water-to-binder-solids ratio, \ntemperature, and the duration of elevated temperature curing on the compressive strength of \nalkali-activated fly ash cement pastes was investigated. Alkali concentration varied between \n3% and 15% Na2O of fly ash mass. An in…
Temperature can significantly affect the performance of a viscoelastic dielectric elastomer (DE). In the current study, we use a thermodynamic model to characterize the influence of temperature on the viscoelastic electromechanical response undergoing a constant electric load by taking into account the temperature dep…
Titanium alloy has been widely used in aeronautics and astronautics industry owing to its unique combinations of properties. The unique physical and chemical properties of titanium alloy make it a typical difficult-to-machine material. The elevated temperatures at the machining zones may cause thermal damage, residual…
An ammonia synthesis using magnetic field to replace Haber-Bosch’s ammonia production is great technological challenge in novel magnetized catalysts area. The carbon nanofiber supported iron catalyst was prepared by modifying carbon nanofiber support surface and later using urea to precipitate iron nitrate by depositi…
The aim of this paper is to determine the high-manganese austenite propensity to twinning induced by the cold working and its effect on structure and mechanical properties, and especially the strain energy per unit volume of new-developed high-manganese Fe – Mn – (Al, Si) investigated steel with various structures aft…
This paper deals with loss and thermal analysis through conductor division in Permanent Magnet assisted-Synchronous Reluctance Motor (PMa-synRM) using squared conductor considering skin effect. Moreover, it is compared with prototype model using circular coil. Many motors have been designed by using circular conductor…
Carbon-supported Pt-Au/C composite nanoparticles (NPs) catalysts with different composition were synthesized by a two steps loading method including adsorption of Au colloid and reduction of H2PtCl6 precursor on carbon black. The effect of Au NPs composition on the electrocatalytic activity of Pt-Au/C composite cataly…
Abstract Copper steels are precipitation-strengthened steels that are designed to have a unique combination of physical and mechanical properties. This article provides an overview of copper precipitate-strengthened steels and their applications, and discusses appropriate ASTM International standards. It describes the…
In the Kroll and Hunter processes to produce titanium from TiCl4, magnesium and sodium are used respectively as reducing agents. These processes are slow and very energy intensive and consequently much work was done over the years to improve the economics of producing these metals. In this regard, more success has bee…
This paper proposes two different low-cost ferrite solutions: first a V permanent magnet assisted synchronous reluctance rotor (VPMSynRM) and the second a permanent magnet synchronous rotor with flux concentrator (PMSM-FC) as an alternative solution to the rare earth inserted tangential permanent magnet synchronous mo…
The use of light weight magnesium alloy offers significant potential towards improvement of the automotive fuel efficiency. However, the application of formed magnesium alloy components in auto-body structures is restricted due to the low formability at room temperature and lack of knowledge for processing magnesium a…
A calculation method for prediction of water permeability through polymers is suggested. An appropriate equation for calculating the activation free energy of permeability is proposed. The method is based on a set of atomic constants associated with the polymer-water interaction energy. The chemical structure of polym…
Abstract This article focuses on heat treating of the most important H-series and low-alloy hot-work tool steels, namely, normalizing, annealing, stress relieving, preheating, austenitizing, quenching, tempering, and surface hardening. It describes the heat-treating procedure for hot-work tools using examples. The art…
Causality verification and enforcement is of great importance for performance evaluation of electrical interconnects. We present two techniques based on Kramers-Krönig dispersion relations, also called Hilbert transform relations, and construction of causal periodic continuations. The first method employes periodic po…
This paper deals with energy management for electric vehicle using SuperCapacitors (SCs) and battery. SCs are connected to the DC bus through a converter whereas battery is directly connected to the DC bus. Using the inversion-based rules of Energetic Macroscopic Representation (EMR), a systematic control structure ca…
It has been demonstrated that alkylzinc halides efficiently destroy the passivating film on the zinc-copper pair in the course of its alkylation with ethyl bromide to give ethylzinc bromide. The alkylzinc halides efficiency is comparable to that of ethyl iodide and exceeds that of salts of transition or non-transition…
O objetivo deste trabalho foi avaliar o efeito do tratamento térmico em algumas propriedades de painéis de partículas, produzidos com resíduos de embalagens de Pinus sp. Foi utilizado o adesivo à base de ureia-formaldeído, na quantidade de 8%. O experimento foi desenvolvido em um fatorial 4 x 3 x 3, sendo quatro propo…
Mixed-anion, GaAs1-ySby metamorphic materials with a wide range of antimony (Sb) compositions extending from 15% to 62%, were grown by solid source molecular beam epitaxy (MBE) on GaAs substrates. The impact of different growth parameters on the Sb composition in GaAs1-ySby materials was systemically investigated. The…
In this paper, based on the constructive interference of plasmonic dipolar and quadrupolar modes, a classical analogue of electromagnetically induced absorption (EIA) is demonstrated theoretically in a stacked metamaterial consisting of a short metal strip (which acts as a bright resonator) and a long metal strip (act…