Materials Literature
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The investigation focused toward microstructure and electrochemical changes caused by proton on a passive film formed on the surface of stainless steel-304 in lower concentrated sulfuric acid solutions (exclusively 0.5, 1.0, 2.0, and 5.0 N concentrations). Dissociation rate of the proton in the acid was reduced due to…
Nous explorons les proprietes structurales de nanoparticules cœur-coquille, avec un cœur de ferrite MFe2O4 (M = Mn et Co) ou de ferrite mixte Mn-Zn. Ces nanoparticules sont obtenues par co-precipitation hydrothermique et sont dispersees en milieu acide par un traitement de surface empirique au nitrate ferrique, proteg…
Proper selection of high-performance materials is crucial in engineering. From the beginning of industrialization and with the advancement of technology, scientists have made enormous efforts for the development of materials which will satisfy specic technical requirements.
esta banca examinadora e pelos vários momentos de descontração em congressos e nos corredores da UnB;
In general, chemically different polymers are incompatible and exhibit macroscopic phase separation because of a vanishingly small mixing entropy of high molecular weight polymer chains, and the phase structure strongly inuences the slow dynamics of blends (Utracki, 1989). Nevertheless, a considerable number of polym…
Patterned polymer structures with different functionalities at the nanoscale have potential applications, such as ash memory devices,1 quantum dots,2,3 templates for nanolithography,4-8 semiconductor transistors9-11 and LEDs.12-14 For the majority of these applications, the rst challenge with respect to the fabricat…
A large amount of the research work in the field of electro-optics is aimed at the relationship between the molecular structure and the net electrical parameters of a molecule. When a polymer solution or a melt is placed in an external static electric field, the polymer molecules involved are oriented and, in some ins…
Alexander Ogg retired as Professor of Physics at UCT at the end of July 1936 to become Director of the new Magnetic Observatory at Hermanus, about 100 km from Cape Town and well away from all sources of the electrical interference that had made sensitive magnetic measurements there well-nigh impossible [1]. The select…
Forging includes a wide range of compressive processes, which develop discrete products with dimensions dened in three directions [1-7]. There can be a very wide range in sizes, in complexities, in rate and temperature, in feedstock shape and microstructure, in dimensional tolerances and product ber, grain and subgr…
Daur ulang limbah plastik polietilen tereftalat (PET) telah dilakukan dengan metode reaksi hidrolisis dengan proses refluks pada suhu 120°C, menggunakan katalis asam sulfat 7,4 M dan variasi waktu refluks selama 4 sampai dengan 12 jam dengan interval 2 jam. Rendemen terbanyak didapatkan pada variasi waktu refluks 12 j…
Thermomagnetic processing (TMP) was examined as a methodology for increasing transformation rate during heat treatment in steel tubes. Two potential benefits were investigated, reduced energy consumption and improved mechanical properties. It is possible to reduce energy consumption with TMP by allowing tempering at l…
This chapter describes the use of a modified rheocasting process with high rotation speeds to manufacture intermetallic TiAl alloys and composites. Basically, the apparatus comprises an isothermal furnace in a vacuum or an inert gas atmosphere which holds the TiAl or composite sample, and a stirrer. The microstructure…
Hydride-generation sampling systems for atomic absorption bear some resemblance to cold-vapor mercury systems. Samples are reacted in an external vessel with a reducing agent, usually sodium borohydride. Gaseous reaction products are then carried to a sampling cell in the light path of the AA spectrometer. Unlike the…
This chapter discusses progress in studying the solidification behaviour of Y123 superconducting oxide, especially non-steady-state growth. RE123 superconducting oxides solidify through a peritectic reaction between the higher temperature stable solid phase RE211 and the liquid phase, governed by solute diffusion in t…
Methods of MCE measurements can be divided into two main groups: direct and indirect techniques. In the direct methods the material is subjected to a magnetic field change and its temperature change is directly measured by some technique. In the indirect methods the MCE and magnetic entropy change is determined on the…
This chapter presents a fundamental study into the role of interfacial energy in determining solidification structures. The effects of solidification and cooling rates on the modification and microstructural refinement process are discussed in relation to the mechanisms operating. The silicon is coarsened with stronti…
This chapter presents the outstandingly large glass-forming ability of the new Pd 40 Cu 30 Ni 10 P 20 alloy through the investigation of in situ undercooling behaviour using a thermal analysis technique. In order to demonstrate the large glass-forming ability of the new palladium-based quaternary metallic glass, the p…
In previous chapters, we have introduced a number of S-FEM models and demonstrated the excellent properties and performance of these models for general problems of solid mechanics defined (by default) in a Lipschitzian domain (i.e., not singular). This chapter aims to extend the application of these S-FEM models for a…
Volatile organic compounds (VOCs) generally are fuels that are easily combustible. Through combustion, which is synomonous with thermal oxidation and incinceration, the organic compounds are oxidized to CO and water, while trace elements such as sulfur and chlorine are oxidized to species such as SO and HCl. Three com…
Dielectric and electro-optic low-frequency analyses are the basic source of information on the electric polarization of charged colloids. In electro-optic investigations, the saturation curves are used to apply fitting procedures to test theoretical constructions or to obtain the saturation value at complete particle…