Materials Literature
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Este trabalho promoveu um estudo das propriedades mecânicas de dois tipos de aço comumente usados para a fabricação de tubos de aço com costura que passam pelo processo de trefilação, o SAE 1012 e o ST-52.3. Os tubos foram tratados termicamente e posteriormente trefilados e as propriedades mecânicas foram avaliadas em…
Abstract Fluoroethylene vinyl ether (FEVE) resins were developed to overcome some of the problems associated with the use of fluoropolymers in coatings. These resins, which yield topcoats with lifetimes exceeding 60 years, can be cured at ambient temperatures for field applications, or at elevated temperatures in the…
Network-on-chip (NoC) is being proposed as a scalable and reusable communication platform for future embedded systems platforms. In this paper a novel routing algorithm for avoiding congested areas using a fuzzy-based routing decision is proposed.The routing path is established by minimizing a cost which is calculated…
Special wax was obtained by liquid-phase oxidation of paraffin by air in the presence of catalyst under atmosphere pressure. The oxidation reaction was carried out in a glass bubble reactor at 150–170°C, with 0.02 g of catalyst and a reaction time of 8 h. The kinetics and mechanism of the catalytic reaction were inves…
The present review article is devoted to the analysis of the problems related to the design of gas sensors based on porous semiconductors (PS). The peculiarities of the semiconductor porosification by anodic etching and the principles of gas sensor design based on porous semiconductors, including gas sensor constructi…
Sulphanilic acid and sulphanilamide schiff bases have been synthesised and evaluated as inhibitors for mild steel corrosion in 1M H2SO4 by electrochemical and non electrochemical techniques. The inhibition efficiency increases with inhibitor concentration and decreases with temperature. The adsorption of the inhibitor…
The dispersion relations of collective oscillations of the magnetic moment of magnetic dots arranged in square-planar arrays and having magnetic moments perpendicular to the array plane are calculated. The presence of the external magnetic field perpendicular to the plane of array, as well as the uniaxial anisotropy f…
We investigate transport properties of molecular junctions under two types of bias--a short time pulse or an AC bias--by combining a solution for the Green functions in the time domain with electronic structure information coming from ab initio density functional calculations. We find that the short time response depe…
The mechanism behind ferromagnetic exchange interaction in GdN is not well understood. It has been argued that it can be due to fourth order cross process of \textit{d-f} mixing and \textit{d-f} exchange. An alternative explanation suggests an anti- ferromagnetic interaction between Gd \textit{d} and N \textit{p} indu…
We investigate the quantum-mechanical localization of protonated and deterated isotopes in the symmetric low-barrier hydrogen-bonds of potassium dihydrogen phosphate (KDP) crystals in the paraelectric phase. The spatial density distributions of these hydrogen atoms are suspected to be responsible for the surprisingly…
Graphene, one-atom-thick planar sheet of carbon atoms densely packed in a honeycomb crystal lattice, has grabbed appreciable attention due to its exceptional electronic and optoelectronic properties. The reported properties and applications of this two-dimensional form of carbon structure have opened up new opportunit…
This slide presentation reviews the importance of Orbital debris engineering models. They are mathematical tools to assess orbital debris flux. It briefly reviews the history of the orbital debris engineering models, and reviews the new features in the current model (i.e., ORDEM2010).
Shape Memory Alloys are called smart or advanced materials because of their special features which are very useful in the latest solutions. Therefore, it is very important to gain a good knowledge of all these features for the purposes of modeling, describing, and ultimately controlling the behavior of these materials…
Abstract 4,5-Dialkylated o-phenylenediamine with oligo(ethylene glycol) units is developed as a stabilizer with reducing property. It reduces chloroauric acid in water, giving lipophilic gold nanosheets whose surface is passivated by the quinoid-form ligands generated in situ. These nanosheets show brilliant golden lu…
This paper summarises the applications of MSMA materials, outlines the mechanism of magnetic shape memory effect and provides the procedure for microstructure evaluation of samples as well as the results of microstructure analysis using the example of the Ni-Mn-Ga alloy.
Abstract The fabrication of nanocomposites consisting of uniform-sized metal nanoparticles arranged at uniform intervals in a fibrous polymer matrix is described. The combined process of metal deposition into periodic holes in anodic porous alumina and polymer injection into the holes yielded metal (Au, Ag)–polymer co…
The molecular mechanics property is the foundation of many characters of proteins. Based on intramolecular hydrophobic force network, the representative family character underlying a protein's mechanics property is described by a simple two-letter scheme. The tendency of a sequence to become a member of a protein fami…
Abstract An amphiphilic polyrotaxane (PRX) composed of biodegradable triblock copolymer of poly(ethylene glycol) (PEG) and poly(l-lactide) (PLLA), PLLA–PEG–PLLA, and many α-cyclodextrins (α-CD) threaded on the triblock copolymer was successfully synthesized. The PRX was found to be self-assembled into vesicle-like wat…
Abstract Cbz-protection of aliphatic and aromatic amines can be accomplished with benzylchloroformate using a catalytic amount of dodecatungstophosphoric acid hydrate (0.05 equiv). The reaction is simple, fast, does not require aqueous work-up and gives excellent yields.
Abstract A Zn(II) porphyrin–1,2,3-triazole conjugate (1-Zn), which can be prepared by click chemistry, afforded a unique self-assembled structure with methanol molecules as glue in the crystals and in toluene solution. The resulting assembled units form a zigzag architecture due to multipoint CH–π interactions in the…