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Inconel 718 is the most employed superalloy in the industry and it is often found in aerospace engines and power generation turbines. Superalloys are known as one of the most difficult group of materials to machine and therefore, tool material, tool geometry and cutting parameters should be carefully selected. Numerous researches have proven the enhanced productivity in turning of ceramic tools compared to carbide ones, while considerably less information is with regard to milling. Moreover, no knowledge has been developed about machining holes with this type of tools. More research on different machining techniques like circular ramping is critical to expand the productivity improvements that ceramics offer. This paper initially reviews prior work about ceramic tools. Then, a 3D simulation and a number of experiments with SiAlON round inserts have been carried out to evaluate the effect of the cutting speed and pitch on the tool wear and chip generation. The results show that three different types of chips are generated as well as that there are three potential wear zones. Top slice wear was identified as the most critic wear type followed by the notch wear. Flank wear and adhesion were also found in most of the tests. To conclude with, a 6.6 times more productive process than with carbide tools was achieved. Cet article étudie deux méthodes utilisées dans le cadre du transport humanitaire en cas de crise (désastre, épidémie...). Le Covering Tour Problem se focalise sur l'équité de distribution des vivres, alors que le Capacitated Vehicle Routing Problem se concentre sur l'urgence de la distribution. Nous proposons une nouvelle approche mélangeant ces deux approches pour former une solution à la fois équitable et rapide. Ce article a été rédigé dans le cadre du TER 2014-2015.

Eddie Boy G. Geslani's CV

El presente es un gráfico doble de una Función de transferencia de un circuíto RLC en serie definida por la relación entre el voltaje en la resistencia (\(V_R\)) y el voltaje en la fuente (\(V_S\)). La ecuación obtenida es \(H(j\omega)=\frac{j\omega RC}{LC(j\omega)^2+RCj\omega+1}\). En el listado, se definen los valores de R, L y C en función de los cuales se traza la gráfica de la ganancia (en rojo) y del desfase (en azul), para el rango de frecuencias considerado. La función de transferencia fue obtenida de la web "Guía práctica para construir un diagrama de Bode y se aprovecha el uso de GNUPLOT para graficar la función de transferencia, la cual depende de variables complejas.

Rizaly Mae Buitizon's CV

Solutions to Chapter 2 of Dummit and Foote's Abstract Algebra

A simple example of creating a list of acronyms using the acronym package, which supports auto-expansion on first mention, and shortening on subsequent mentions.

Principios de desarrollo ideal en el ajedrez

Quan Ho's CV

This template can be used for Project Reports. It is customised for the AGISIT MSc course at Instituto Superior Técnico (IST) of Universidade de Lisboa (UL), but can be used for other purposes.