Encontrados 21 documentos, a visualizar página 1 de 3

The effect of increasing V content on the structure, mechanical properties and ...

In the last years, vanadium rich films have been introduced as possible candidates for self-lubrication at high temperatures, based on the formation of V2O5 oxide. The aim of this investigation was to study the effect of V additions on the structure, mechanical properties and oxidation resistance of Ti–Si–V–N coatings deposited by DC reactive magnetron sputtering. The results achieved for TiSiVN films were comp...

Chitosan–lignosulfonates sono-chemically prepared nanoparticles : characterisat...

Due to their recognised properties of biocompatibility, biodegradability and sustainability, chitosan nanocarriers have been successfully used as new delivery systems. In this work, nanoparticles combining chitosan and lignosulfonates were developed for the first time for cosmetic and biomedical applications. The ability of lignosulfonates to act as a counter polyion for stabilisation of chitosan particles, gen...

Sonochemical and hydrodynamic cavitation reactors for laccase/hydrogen peroxide...

Article in press ; The main goal of this work is to develop a novel and environmental-friendly technology for cotton bleaching with reduced processing costs. This work exploits a combined laccase–hydrogen peroxide process assisted by ultrasound. For this purpose, specific reactors were studied, namely ultrasonic power generator type K8 (850 kHz) and ultrasonic bath equipment Ultrasonic cleaner USC600TH (45 kHz...

Fatigue behaviour of AA6082-T6 MIG welded butt joints improved by friction stir...

Friction Stir Processing (FSP) was based on the principles of Friction Stir Welding (FSW), a solid-state joining process originally developed for aluminium alloys. It is an emerging metalworking technique which can provide localized modification and control of microstructures in near-surface layers of processed metallic components. In this research, FSP appears as an alternative to traditional methods for fatig...

Influence of tool shoulder geometry on properties of friction stir welds in thi...

The aim of this work is to study the influence of the shoulder geometry on friction stir welding of 1 mm-thick copper-DHP plates. The welds were produced using three different shoulder geometries, flat, conical and scrolled, and varying the rotation and traverse speeds of the tool. The flat shoulder tool proved to be inadequate for performing welds, because many defects were produced for all welding conditions....

The signature of a small-throw fault affecting unconsolidated sediments in S-wa...

Estimation of imageable dip range of target structures in interferometric salt ...

Keratin-based peptide : biological evaluation and strengthening properties on r...

A peptide based on a fragment of hair keratin type II cuticular protein, keratin peptide (KP), was studied as a possible strengthening agent for weakened relaxed hair. The peptide was prepared both in aqueous water formulation (WF) and organic solvent formulations (OF), to determine the effect of organic solvents on peptide interaction with hair and the differences in hair recovery. Both peptide formulations we...

Folic acid-functionalized human serum albumin nanocapsules for targeted drug de...

Activated synovial macrophages play a key role in Rheumatoid Arthritis (RA). Recent studies have shown that folate receptor beta (FRβ) is specifically expressed by activated macrophages. Therefore a folate-based nanodevice would provide the possibility of delivering therapeutic agents to activated macrophages without affecting normal cells and tissues. This study shows for the first time the sonochemical prepa...

Tenacidade da zona termicamente afectada de soldaduras num aço ao C-Mn normalizado

Dissertação apresentada para obtenção do grau de Mestre em Materiais e Processos de Fabrico, na Faculdade de Engenharia da Universidade do Porto, sob a orientação do Prof. Doutor A. A. Fernandes