9,922 research outputs found
Islamic Practices, Traditions and Beliefs in Egypt and the Eastern Mediterranean in the Early 16th Century: Georgius Gemnicensis’ Ephemeris
No full textThis article reports several excerpts of Georgius Gemnicensis’ Ephemeris, a travel journal in which the author recounted his experiences in Mamluk Egypt and the Eastern Mediterranean, and provided a number of details about customs, beliefs and Islamic practices in such territories at the beginning of the 16th century
Characterization of microporous amorphous Alumina-Boria
No full textAlumina-boria samples with B : (B + Al) 0-50 atom% have been prepared by an unconventional procedure consisting of the reductive decomposition of the mixture of nitrates in the presence of glycerol X-ray diffraction (XRD)-amorphous samples having surface areas of 380-470 m2 g-1 were obtained after calcination at 673 K. Their thermal stability has been studied by differential thermal analysis (DTA) and XRD analysis, showing that crystallization occurred in all cases above 1150 K. FTIR data show the predominance of octahedral Al3+ and triangular B3+ both in the bulk and on the surface. Correspondingly, all samples show lower catalytic activity in methanol dehydration compared with gamma-alumina. It was concluded that boron tends to hinder crystallization of amorphous alumina, to increase its surface area and to further decrease it surface acidity
Uma leitura do afresco "A árvore de Jessé", de Giuseppe Arcimboldo: articulações simbólicas numa perspectiva interdisciplinar
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas, Programa de Pós-graduação em Ciências Humanas, Florianópolis, 2013.Esta pesquisa consiste numa análise dos simbolismos presentes no afresco de Giuseppe Arcimboldo intitulado "A Árvore de Jessé", artista milanês do século XVI, famoso por suas obras compostas. Nesta investigação será apresentada uma hipótese que permite ampliar o olhar sobre essa obra a partir da percepção de uma cabeça composta. A problemática investigada consiste na significação da obra a partir das escolhas feitas pelo artista em termos de linguagem pictórica e simbólica, na articulação de conceitos e ideias, visando responder à pergunta: o que essa obra que abrange duas imagens e seus símbolos inter-relacionados pode significar? A perspectiva teórica utilizada concebe os símbolos como parte do mundo imaginário , com suas raízes no inconsciente coletivo. O objetivo principal visa realizar uma interpretação possível da referida obra, analisando os símbolos presentes que faziam parte do imaginário da sociedade européia daquele período. E como objetivos específicos: aprofundar o conhecimento sobre a significação na pintura com relação à interpretação de simbolismos; e contribuir no campo de estudos sobre a criação pictórica de Arcimboldo. Foram incluídos elementos extra-pictóricos abrangendo o seu contexto de surgimento, numa perspectiva metodológica que se aproxima da de Panofsky, mas à qual foi acrescentada a identificação de formas perceptíveis e uma análise dos símbolos. Os procedimentos utilizados foram: pesquisa bibliográfica sobre o artista, seu contexto e os significados de mitos e símbolos segundo o método comparativo; pesquisa e trabalho com imagens; e observações à obra em uma reprodução e in loco na Catedral de Monza. A obra é abordada de diferentes ângulos, buscando o desenvolvimento de um olhar multifocal com contribuições de diversas disciplinas das ciências humanas. A imagem da árvore veicula significados que lhe foram atribuídos por diferentes tradições, agrupados neste trabalho em 10 categorias de análise e mais uma abrangendo as demais. Para a leitura desta imagem dupla propõe-se aqui o conceito de âncora da imagem. Os diversos símbolos direcionam para significados coincidentes, cuja recorrência condiz com o pensamento mágico da época voltado para a busca de correspondências entre os elementos da natureza e o homem visando encontrar uma unidade harmônica Abstract: The present research is an analysis of symbolisms in the fresco entitled Tree of Jesse painted by G. Arcimboldo, a XVI century artist from Milan, famous for his composite works. This thesis presents a hypothesis that allows for the broadening look at this fresco from the perception of a composite head. The investigated problem consists in the meaning of the work from the choices made by the artist in terms of pictoric and symbolic language, in the articulation of concepts and ideas, aiming at answering the following question: What can this work (which comprises two images and their interrelated symbols) mean? From the theoretical perspective drawn upon, the symbols are part of the imaginary world, with its roots in the collective unconsciousness. The main purpose aims at a possible interpretation of this fresco, analyzing its symbols which were part of the European society of that time. The specific objectives are to further the understanding of the painting in terms of interpretation of its symbolisms and of Arcimboldo´s pictoric creation. Extra-pictoric elements were included such as the context where the fresco was produced, in a methodological perspective resembling that of Panofsky, but also adding the identification of perceptible forms and an analysis of the symbols. The procedures were: bibliographic search about the author, his context and the meanings of myths and symbols as proposed in the comparative method; research and work with images; and observation of a copy of the work and of the original fresco at the Monza Cathedral. The fresco is studied from different angles, with an attempted multifocal look drawing on several disciplines from the Human Sciences. The image of the tree conveys meanings attributed to it by different traditions, grouped in this thesis under 10 categories of analysis and an additional one comprising all the others. For the reading of the double image the concept of anchor image is proposed. The diverse symbols are directed towards coincidental meanings whose occurrence is aligned with the magic thought of that time, with the search for congruity between elements of nature and man aiming at finding a harmonious unity
La metafísica platónico-rosminiana de Giuseppe Buroni
No full textIn this article, the author seeks to demonstrate that Giuseppe Buroni´s metaphysics, which can be called Platonic-Rosminian, expresses perennial Christian philosophy. Therefore, he collected Buroni’s central approaches from Nozioni di ontologia. Here, we can find an impressive metaphysical work about the ontological distinction, the matter of unity and multiplicity, the production or the creation from the point of view of theosophy, and the demonstration of God’s existence.En este trabajo, el autor busca demostrar que la metafísica de Giuseppe Buroni, a la que puede tildarse de platónico-rosminiana, es una expresión de la filosofía cristiana perenne. Para ello, se recuperan las Nozioni di ontologia de las que se extraen sus planteamientos centrales. Ahí se encuentra la distinción ontológica prolijamente desarrollada, el tema de la unidad y la multiplicidad, la producción o creación desde el punto de vista de la teosofía y la demostración de la existencia de Dios
The economic burden of stroke in Italy. The EcLIPSE Study: Economic Longitudinal Incidence-based Project for Stroke Evaluation.
No full textStroke is the second most common cause of death in the world. The aim of this study is to estimate stroke’s direct costs and productivity losses in Italy from a societal perspective and to explain cost variability. A prospective observational multicentre cost of illness study was designed. Four hundred and forty-nine consecutive patients admitted because of acute first-ever stroke in 11 Italian hospitals were enrolled. Costs and outcomes were assessed at patients’ enrolment, and at 3, 6 and 12 months after discharge. Overall, social costs in the first six months following the attack were € 11 600 per patient; 53% of this was health care costs, 39% non-health care costs and the remaining 8% productivity losses. Age, level of disability and type of hospital ward were the most significant predictors of six-month social costs. The acute phase counted for more than 50% of total health care costs, leaving the remaining 50% to the post-acute phase, indicating that follow-up should be on the agenda of policy makers also
Deoxygenation of non-edible vegetable oil to produce hydrocarbons over Mg-Al mixed oxides
No full textThe transition from the use of fossil fuels to alternative and innovative fuels is a complex process involving two main points: the research of a new generation of raw materials and the development of the related technology. Regarding to raw materials, vegetable oils have the capacity to storage large a+mounts of energy, a capacity directly related to their chemical structure, which have similar carbon chains to the common fuels such as gasoil or diesel. However, vegetable oils, which are mostly constituted by triglycerides, cannot be easily used as such. Additionally, they contain significant amounts of oxygen atoms incorporated in the form of carboxyl groups. Consequently, they need to be treated through a deoxygenation process to be converted into useful fuels. Selective deoxygenation can be obtained by promoting the reactions of decarboxylation and decarbonylation in limited presence of hydrogen or even in absence of this gas. Selective decarboxylation of fatty acids results in the elimination of carboxylic groups producing CO2 and a paraffin hydrocarbon (n-alkane with one less carbon atom than the starting fatty acid) while selective decarbonylation leads to the formation of CO, H2O and an olefinic hydrocarbon (the corresponding alkene). When realized over triglycerides these reactions imply also the cracking of the glycerol moiety producing light hydrocarbons. Additionally, ketonization occurs producing high molecular weight ketones that can later be cracked to lighter methyl-ketones. Such pyrolytic processes may bring different benefits, such as the production of high-cetane-number linear hydrocarbons within the diesel range coming from biological sources, which are fully compatible with existing engines and infrastructure. Also, by-products as CO2could be recovered and used in an integrated biorefinery. Previously, we studied the deoxygenation of oil a non-edible oil (Jatropha curcas oil) and waste cooking vegetable oil in a hydrogen free atmosphere using ?-Al2O3, CaO and Mg-Al mixed oxides (obtained from treated hydrotalcite) as catalysts. Mg-Al mixed oxides (calcined hydrothalcite) revealed interesting catalytic activity. This communication reports on the analysis of the chemical composition of the products obtained during the catalytic pyrolysis of Jatropha curcas oil, at different temperatures and reaction times, using the same catalyst. In the experiments, it was evidenced that the liquid biofuel recovered at 400 °C was composed mainly by hydrocarbons (66 mol % including n-paraffins and aliphatics), this amount increased for the product recovered at 425 °C (77 mol % including n-paraffins and aliphatics). Those compositions are not very different from that of commercial Diesel B7 (91 mol % of hydrocarbons including n-paraffins and aliphatics). It is suggested that Jatropha curcas oil deoxygenation proceeds mainly through the reactions of decarboxylation and ketonization (also involving a decarboxylation). While, ketonization reaction was favored at the lowest temperature tested, it was evident that decarboxylation reaction was predominantly by increasing the temperature
Deoxygenation of waste cooking oil and non-edible oil for the production of liquid hydrocarbon biofuels
No full textDeoxygenation of waste cooking vegetable oil and Jatropha curcas oil under nitrogen atmosphere was performed in batch and semi-batch experiments using CaO and treated hydrotalcite (MG70) as catalysts at 400. °C. In batch conditions a single liquid fraction (with yields greater than 80. wt.%) was produced containing a high proportion of hydrocarbons (83%). In semi-batch conditions two liquid fractions (separated by a distillation step) were obtained: a light fraction and an intermediate fraction containing amounts of hydrocarbons between 72-80% and 85-88% respectively. In order to assess the possible use of the liquid products as alternative fuels a complete chemical characterization and measurement of their properties were carried out
Historia contemporanea de América latina
No full textEsta turbulenta historia logra narrar las singularidades de cada país sin perder la mirada de conjunto y desenreda los problemas comunes que esconden los relatos localistas de fuerte raigambre nacionalista
Una historia sin concesiones, alejada de los tópicos con que los europeos suelen interpretar Hispanoamérica, que desvela el motor de su historia.
De Giuseppe busca entender la relación difícil, y no pocas veces violenta, entre las élites gobernantes y los pueblos indígenas y negros, entre las clases populares mestizas y los constructores criollos del relato nacional.
Precisamente es en estas fisuras y desacuerdos donde nacen los caudillos decimonónicos y los líderes carismáticos y populistas del siglo X
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