Materials Literature
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Electropolishing (EP) is a surface finishing process in which the surface roughness is eliminated through selective electrochemical dissolution. The metal to be polished is immersed in an electroly...
This paper deals with sudden short-circuit transient regimes of a three-phase salient poles synchronous generator. The three-phase, two-phase and single-phase transient short-circuits of a synchronous generator with two pole pairs, 1500 rev/s, are studied analytically, by finite elements analysis (FEA) and experimenta…
In this paper, we studied the relaxation of (001) surface of BaTiO3 and SrTiO3 slabs with two termination surfaces and with 3, 5, and 7 layers thickness for each cases, using density functional theory and generalized gradient approximation for exchange-correlation functional and pseudo potential method. We calculated…
Polymer biocomposites have attracted a lot of attention due to the increasing requirements for biomaterials to replace conventional materials. This replacement is due to the remarkable properties of biomaterials, including their biocompatibility, biodegradability and non-toxicity. Chitosan (CS) is a renowned abundantl…
O ensaio de micro desgaste abrasivo tem sido objeto de uma quantidade significativa de pesquisas nos últimos anos, quando o seu potencial para avaliar o comportamento de recobrimentos finos se tornou relevante. O objetivo deste trabalho é a construção de um dispositivo para a realização de ensaios de micro desgaste ab…
Abstract The results of the modification of austenitic matrix in cast high-manganese steel containing 11÷19% Mn with additions of Cr, Ni and Ti were discussed. The introduction of carbide-forming alloying elements to this cast steel leads to the formation in matrix of stable complex carbide phases, which effectively i…
ResumoEste trabalho tem por objetivo estudar a influência do tecimento na soldagem TIG com alimentação de arame frio em único passe visando à aplicação futura em revestimento de ligas de níquel, considerando a análise das características geométricas e diluição, de forma a adequar estes revestimentos para as indústrias…
Ferroelectric superlattices with polarization perpendicular to the surface or interface are studied within the framework of the Landau-Ginzburg theory. An interface energy is introduced in the free energy to describe the effect of mixing and local polarization coupling at interface. Internal electric field is consider…
The electronic structure and geometry of metal−carbon nanocomposites based on pyrolyzed polyacrylonitrile (PPAN) with Cu, Si, Fe, Co and Ni atoms using the DFT method have been theoretically studied. The effect of nitrogen on the stability of PPAN and its conductivity has been determined. The electrophysical propertie…
In order to generate powerful radicals as oxidizing species for the complete oxidation of NO, homogeneous activation of peroxymonosulfate (Oxone: PMS) by the Mn3O4/GO catalysts was explored. The catalytic oxidation of NO from waste gas was investigated using advanced oxidation process based on sulfate radicals that pr…
A variety of N-substituted pyrroles have been prepared by reacting 2,5-hexadione with amines or diamines in the presence of iron (III) phosphate at room temperature under solvent-free conditions. The experiment protocol features simple operations, and the products are isolated in high yields (88-99%).
A composite material has recently been described in a patent application for which the dielectric constant increases substantially with electric field. While the patent describes the material in some detail, including providing examples of composites and processing methods which do and do not produce field-dependent d…
Two-dimensional (2D) hydrous silica sheets (HSSs) and hydrous silica nanotubes (HSNTs) have many unique properties and potential applications. Although preparation of 2D HSSs was patented already about half a century ago, very little is known about their structure and physical properties. Here we predict formations of…
Abstract This paper presents a numerical investigation of fracture criterion influence on perforation of high-strength 30PM steel plates subjected to 7.62x51 mm Armour Piercing (AP) projectile. An evaluation of four ductile fracture models is performed to identify the most suitable fracture criterion. Included in the…
Silicon nitride is a promising alternative to carbon based materials for protective coatings, owing to its compatibility with existing silicon-based microfabrication. The complexity of the fabrication processes and contaminations hamper fine-tuning to obtain desirable coating properties. We have explored the reactive…
Magnesium doped zinc ferrite Zn1−xMgxFe2O4 (x = 0.00, 0.25, 0.50, 1.00) was prepared by sol-gel technique. X-ray diffraction analysis revealed single cubic spinel structure with crystallite size ranging from 18 nm to 8 nm. Elemental analysis using XRF confirmed the purity of the samples. The lattice parameter was foun…
The dynamics of large amounts of dislocations governs the plastic response of crystalline materials. In this contribution we discuss the relation between the mobility of discrete dislocations and the resulting flow rule for coarse-grained dislocation densities. The mobilities used in literature on these levels are qui…
Metallic Zn nanodisks with hexagonal morphology were obtained onto glass substrate under vacuum thermal evaporation. A thermal characterization of Zn nanodiks showed a lower oxidation temperature than source powder Zn. Different thermal treatment on Zn nanodisks played an important role on the morphology, crystal size…
We demonstrated that reduced graphene oxide (rGO) can suppress electromigration (EM) of Cu interconnect lines. This improvement in the EM lifetime is attributed to the presence of functional groups between the rGO and Cu atoms. Further enhancement of the EM lifetime was achieved by increasing the functionality of grap…
This paper signifies a method of development of a forced draft biomass cook stove for off-grid rural areas where the technology of thermoelectric generator has been implemented for electricity generation. The thermoelectric generator is a semiconductor device that converts heat energy directly to electrical energy. Th…