Associating the most influential parameters with the product distribution is of uttermost importance in complex catalytic processes such as fluid catalytic cracking (FCC). These correlations can lead to the information-driven catalyst screening, kinetic modeling and reactor design. In this work, a dataset of 104 uncorrelated experiments, with 64 variables, has been obtained in an FCC simulator using 6 types of feedstock (vacuum gasoil, polyethylene pyrolysis waxes, scrap tire pyrolysis oil, dissolved polyethylene and blends of the previous), 36 possible sets of conditions (varying contact time, temperature and catalyst/oil ratio) and 3 industrial catalysts. Principal component analysis (PCA) has been applied over the dataset, showing that the main components are associated with feed composition (27.41% variance); operational conditions (19.09%) and catalyst properties (12.72%). The variables of each component have been correlated with the indexes and yields of the products: conversion, octane number, aromatics, olefins (propylene) or coke, among others.
Dear SirThere are many surgical procedures that are given the name of the surgeon or surgeons who described them. Even in the past, it seems that it has been very dicult to be sure that no-one had previously described a similar procedure. This also happens all over the world with stories and novels, in which the plot is attributed to the author of the well-known version and not to a previous, less widely-read writer, whose work was probably not read by the more famous author.Procedures on the distal end of the ulna are aected by this phenomenon and many names are associated with them. This has been subject of several publications (Buck-Gramcko, 1990;Kapandji, 1992;1998). Distal radioulnar arthrodesis with segmental ulnar resection is thought to have been described ®rst by Sauve and Kapandji (1936) (Buck-Gramcko, 1990).We have found an article published in the British Journal of Surgery in 1931 by J. A. Berry of Napier, New Zealand, in which he reports the case of a 20-yearold patient who presented with instability at the distal radioulnar joint as a result of a previous fracture of the distal epiphysis of the radius, associated with a separation of the styloid process of the ulna (Berry, 1931). Berry described the surgical procedure carried out on 4 February 1930.`I
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