Design and manufacturing of a Selective Laser Sintering test bench to test sintering materials

The goal of this project is to design and build a prototype of recoating system for a laser cutting machine to turn it into a selective laser sintering printing machine. This prototype will be used to study new sintering materials and to design, if decided, a SLS 3D printing Machine (Selective Laser Sintering). This project has been developed in the installations and funded by Fundació CIM. The project develops the mechanical design and the electronic system design. Both parts are explained on this paper, so new users can use the machine and can understand the system. With this paper, it is expected that it can be improved in a future to test other parameters and configurations. The paper is divided in three basic blocks that are summed up here: The first block is an introduction to the 3D printing technologies. The most used of them are explained and selective laser sintering is explained in deep. With this block the reader can understand why it is important to develop the SLS technology and what has to be done to improve the machines and the technology. The second block is a discussion on the mechanical design of the machine. The general idea of the machine is explained so the user can understand why the machine is designed in this way. After that, each part is detailed to see how the different mechanical challenges where overtaken. At the end of the block, there is a small calculations section needed on the electronic part. The third block is an extensive explanation of the electronic system that controls and moves the machine. In that block, the different components are explained so the user can understand its basics working principles. It is also explained how the selection of the electronic components was done. Then everything is put together to see the whole electronic system. Along with this paper, there are annexes that provide some extra information for the reader. One of this annexes refers to the mechanical part and the other one has some datasheets and coding for the electronic section. The whole design has been done in SOLIDWORKS cad software and its electric extension ELECWORKS. The programming job was done with Arduino compiler

Un periodo crucial en la construcción del medievalismo en Cataluña: de "La Historia de Cataluña y la Corona de Aragón" de Víctor Baklaguer (1863, a "Los orígenes de la revolución catalana" de Jaime Vicens Vives (1957)

Study of the evolution of the Catalan medievalism, from the origin in the Renaisance cultural movement, during the 19th century, to Jaume Vicens Vives in de half 20th century. This work analyses the development of the Catalan historiography and their more important manifestations in the periods of Romanticism, Positivism and Social History. Include also the us of myts and topics more currently for the historians.Study of the evolution of the Catalan medievalism, from the origin in the Renaisance cultural movement, during the 19th century, to Jaume Vicens Vives in de half 20th century. This work analyses the development of the Catalan historiography and their more important manifestations in the periods of Romanticism, Positivism and Social History. Include also the us of myts and topics more currently for the historians

Els arxius patrimonials catalans, de què estem parlant?

L'article resumeix el concepte d'Arxius Patrimonials i les seves principals definicions. Els distingeix dels Arxius Senyorials. Finalment fa un resum dels principals continguts documentals d'aquesta classe d'arxius.The article summarizes the concept of Heritage Archives and their key definitions. They're differentiated from Aristocratic Archives. Finally, the article explains the main documents contained of this kind of archive

Sportifs et produits dopants : prise, emprise, déprise

Cet article recèle un triple objet : la récusation en doute de conceptions du dopage homologuées par des regards juridiques et médicaux, la reconsidération critique de la place des analyses des sciences sociales par rapport à l'hégémonie biomédicale en matière de dopage, un essai de modélisation du pouvoir fondé sur la relation d'emprise sportifs-produits. Pour ce faire, un matériau empirique recueilli au cours d'enquêtes précédentes (entretiens de sportifs dopés, témoignages publiés) est mobilisé et analysé systématiquement. L'étude de cas variés de recours aux produits dopants met à mal des conceptions ordinaires du dopage et révèle la présence d'actes où la dimension relationnelle est déterminante, où l'unanimité et la simplicité des frontières entre le dopage et une préparation médicalement assistée est brouillée, dont l'enchaînement est réversible, où s'observe enfin un continuum dans les usages possibles des produits. Est alors proposé un modèle qui vise la compréhension des relations de pouvoir dans le dopage au travers de mécanismes d'emprise impliquant des personnes, des situations et des produits, agencés en différentes configurations : ''lâcher prise in situ'', ''agir en confiance et subir une emprise'', ''éprouver ses prises''

Estabilidad y descomposición de las disoluciones de peróxido de hidrógeno.

Estudio sobre el uso de peróxido de hidrógeno para determinar la estabilidad de la sustancia.Peer Reviewe