Materials Literature
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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra
International audience
International audience
The aim of this work was to find a new manufacturing process to produce bio-scaffolds based on polycaprolactone composition for tissue engineering applications. In the first step we produced via electrospinning method a polycaprolactone nanofibrous mesh. The next step was focused on the treating of the nanofibers by t…
This work will describe research directed towards the synthesis of anisotropic gold nanoparticles as well as their functionalization and biological applications. The thesis will begin by describing a new technique for the high-yield synthesis of gold nanorods using hydroquinone as a reducing agent. This addresses impo…
U radu je izvrsena usporedba klizanja kotaca dva razlicita skidera pri jednakim uvjetima privlacenja (jednaki tovari i nagibi traktorskog puta i sumske vlake). Prvi skider u istraživanju je ECOTRAC 120 V, hrvatskog proizvođaca Hittner d.o.o. sa mehanickom transmisijom, a drugi skider je slovenske proizvodnje WOODY 110…
Abstract Electrolytic plasma processing (EPP) was applied to 1018 low-carbon steel surfaces, and the resulting corrosion resistance was evaluated in a 3.5% NaCl solution. The EPP treatment parameters are detailed, and the findings demonstrate improved corrosion rates and reduced localized corrosion, attributed to the…
Abstract The Jominy End-Quench Test is a powerful method to establish the hardenability of a given steel, as measured by the hardness of the microstructures produced as a function of cooling rate from the quenched specimen end. Hardness, however, does not assess fracture mechanisms and the critical difference between…
Abstract Achieving deep carburized cases in large parts, i.e. depths of 2mm or more, can often be problematic. Requiring long diffusion times at temperature, unanticipated furnace power fluctuations, changes in gas supply, inaccurate probe function, and/or atmosphere changes may result in insufficient case depth. Risi…
U radu je izvrsena usporedba klizanja kotaca dva razlicita skidera pri jednakim uvjetima privlacenja (jednaki tovari i nagibi traktorskog puta i sumske vlake). Prvi skider u istraživanju je ECOTRAC 120 V, hrvatskog proizvođaca Hittner d.o.o. sa mehanickom transmisijom, a drugi skider je slovenske proizvodnje WOODY 110…
Abstract In the paper new phenomena are discussed which were discovered during investigation of the intensive quenching processes. It is shown that in many cases film boiling is prevented completely during quenching of steel parts in cold liquids, especially in water salt solutions. In this case, the part surface temp…
Abstract This presentation will discuss a flexible atmosphere heat treating system employing salt quench systems that are considerably faster, than existing technology utilizing internal quench systems. Topics include: improved temperature control, temperature uniformity/uniformity of the austenitizing process; improv…
In this thesis numerical methods are used to understand the individual and collective optical response of metal nanoparticles (MNPs). In particular, finite 1D assemblies of MNPs are characterized by analytical solutions to Maxwell's equations. Small particle solutions such as the well-established plasmon hybridization…
Twelve (12) Mock Comp-B specimens were received from Sandia National Laboratories in Albuquerque. Specimens were approximately 76.3 mm long and 15.8 mm in diameter. Weights varied from 21.23 to 22.14 grams, and various pieces had visible, mm-sized holes or gaps due to fabrication. Hand-marked lines, 1-centimeter down…
Abstract Three dimensional numerical models have been developed to simulate almost all steps in the thermal processing of metals with the notable exception of the quenching operation. There, the surface heat flux rates are frequently based on limited experimental thermocouple data and inverse generated heat flux rates…
Abstract Molybdenum sheaths are critical for protecting thermocouple components in high-temperature furnace environments up to 2200°C, but traditional tungsten inert gas welding introduces significant material vulnerabilities. The welding process traditionally increases grain size through solidification and operationa…
A novel multiscale approach is introduced for determining the thermal conductivity of polymer nanocomposites (PNCs) reinforced with single-walled carbon nanotubes (SWCNTs), which accounts for their intrinsic uncertainties associated with dispersion, distribution, and morphology. Heterogeneities in PNCs on nanoscale ar…
Single particle microscopy and spectroscopy strategies reveal hidden relationships between the surface plasmon resonances (SPRs) and the sizes, shapes, and arrangements of gold nanoparticles (Au NPs). The SPR, the coherent oscillation of the conduction electrons, leads to intense absorption and scattering of light at…
In gas carburizing, the source of carbon is a carbon-rich furnace atmosphere produced either from gaseous hydrocarbons or from vaporized hydrocarbon liquids. To predict the amount of carbon available to the steel surface, theoretical steps with anticipated process variable inputs can be applied, and diffusion can be s…
Nobel metal nanoparticles that exhibit plasmon resonances in the visible and near infrared have been of great interest in recent years. Strong light-matter interactions on the nanoscale have a range of interesting properties that may be useful in applications in medicine, sensing, solar energy harvesting and informati…