6,891 research outputs found
Design and development of the target-ion source system for the SPES project
No full textThe most important project of LNL (National Laboratory of Legnaro), one of the four Laboratory of INFN (National Institute for Nuclear Physics), is the SPES project, now at the construction phase. The aim of this new facility is to produce Radioactive Ion Beams in the neutron rich side of the so-called “valley of stability”. This is a very challenging project since it requires a lot of knowledge and studies from physical, chemical, engineering points of view. The core of the facility is a uranium carbide target mantained at high temperature (above 2000°C) which produces by fission radioactive atoms by means of an energetic and powerful proton beam.
In this thesis, both the target and some of the most delicate devices which have to be installed inside the SPES bunker where the nuclear reactions occur are presented. In particular, the design phase of the target and the tests performed at iThemba LABS in South Africa will be presented, as the design of all the diagnostics that have to be installed to safely manage and control the production of the radioactive beams. Finally, the design phases and tests of the Wien Filter used as the preliminary mass separator to decrease the unwanted radioactivity along the beam line will be showed
[Poesia] Três poemas de Alberto Secama
No full textThree poems by Alberto Secama. About the author: Alberto Secama is an Angolan poet who has poems published on many websites and on facebook:https://www.facebook.com/Xungurra/abouthttp://www.pordentrodaafrica.com/cultura/africa-em-verso-rio-kwanza-por-alberto-secamahttp://www.pordentrodaafrica.com/cultura/africa-em-verso-zong-por-alberto-secamahttp://www.pordentrodaafrica.com/cultura/coluna-africa-em-verso-o-sol-la-fora-por-alberto-secamaTres poemas de Alberto Secama. Sobre el autor: Alberto Secama es un poeta angoleño que tiene poemas publicados en varios sitios y en el facebook:https://www.facebook.com/Xungurra/abouthttp://www.pordentrodaafrica.com/cultura/africa-em-verso-rio-kwanza-por-alberto-secamahttp://www.pordentrodaafrica.com/cultura/africa-em-verso-zong-por-alberto-secamahttp://www.pordentrodaafrica.com/cultura/coluna-africa-em-verso-o-sol-la-fora-por-alberto-secamaTrês poemas de Alberto Secama. Sobre o autor: Alberto Secama é um poeta angolano que possui poemas publicados em vários sites e no facebook:https://www.facebook.com/Xungurra/abouthttp://www.pordentrodaafrica.com/cultura/africa-em-verso-rio-kwanza-por-alberto-secamahttp://www.pordentrodaafrica.com/cultura/africa-em-verso-zong-por-alberto-secamahttp://www.pordentrodaafrica.com/cultura/coluna-africa-em-verso-o-sol-la-fora-por-alberto-secam
Orizzonti mantovani. Spunti e dinamiche paesaggistiche ne L'Illustrissimo di Alberto Cantoni
No full textIn the literary production of Alberto Cantoni, short story writer and novelist between the nineteenth and twentieth centuries, the novel L'Illustrissimo is highly important both because it is the last publication of the author, from Pomponesco, a small town a few kilometers south of Mantua, both because it summarizes in a single text the different nuances and different directions that his writing has taken over the course of his literary career, also due to a writing and processing time that embraces the entire span of years of his career itself. In the foreground, in addition to the numerous and brilliant characters, one of the protagonists is the Mantuan landscape which, not a simple background, becomes a true literary parameter which in different and significant ways affects the purposes and mechanisms of the novel
Plenary Session: Luis Alberto Urrea
No full texta) Plenary Session: Luis Alberto Urrea, Mexican American Chicago Writer
Luis Alberto Urrea is a 2005 Pulitzer Prize finalist for non-fiction and member of the Latino Literature Hall of Fame. He is a prolific and acclaimed writer who has used his dual-culture life border experiences to explore the complex and interconnected Mexican-US American reality. The critically acclaimed and best-selling Mexican-born author of 13 books, Urrea has won numerous awards for his poetry, fiction and essays.
Moderator: Dr. Héctor García, Loyola University Chicag
A combined experimental and numerical approach for the control and monitoring of the SPES target during operation at high temperature
No full textThe SPES project at INFN-LNL aims at the production of neutron-rich Radioactive Ion Beams (RIBs) using
the ISOL (Isotope Separation On Line) technique. A 40 MeV 200 lA proton beam will directly impinge a
uranium carbide target, generating approximately 1013 fissions per second. The target system is installed
under vacuum inside a water-cooled chamber, and have to maintain high working temperatures, close to
2000 C. During operation the proton beam provides the heating power required to keep the target at the
desired temperature level. As a consequence, its characteristics have to be strictly controlled in order to
avoid undesired overheating. According to the original design of the control system, the proton beam can
be suddenly interrupted in case of out of range vacuum or cooling water flow levels. With the aim to
improve the reliability of the control system a set of temperature sensors has been installed close to
the target. Their types and installation positions were defined taking into consideration the detailed
information coming from a dedicated thermal–electric model that allowed to investigate the most critical
and inaccessible target hot-spots.
This work is focused on the definition and experimental validation of the aforementioned numerical
model. Its results were used to appropriately install two type C thermocouples, a PT100 thermoresistance
and a residual primary beam current detector. In addition the numerical model will be used
for the definition of appropriate thresholds for each installed temperature sensor, since it allows to define
a relationship between the locally measured values with the overall calculated temperature field. In case
of over temperatures the monitoring system will send warning signals or in case interrupt the proton
beam
Study of a simplified CoolGal target to support the Phase-0 NEPIR facility
No full textThe NEPIR facility (NEutron and Proton Irradiation), currently in development at the Laboratori Nazionali di Legnaro of the Istituto Nazionale di Fisica Nucleare (LNL-INFN), will serve as the first fast neutron (En > 1 MeV) irradiation source in Italy specifically designed to support advanced scientific research and industrial applications. Powered by the SPES (Selective Production of Exotic Species) variable-energy proton cyclotron, NEPIR will be implemented in two main phases. Phase-0 will deliver continuous (white spectrum) and Pseudo Quasi-Monoenergetic neutron fields, while Phase-1 will introduce true Quasi-Monoenergetic Neutron beams and an atmospheric-like neutron spectrum. The Phase-0 target system, CoolGal, is based on a thick beryllium target and is intended to evolve into a galinstan-cooled configuration for high-power operation. To simplify initial commissioning, a water-cooled prototype—excluding galinstan—has been developed. This paper presents thermal and structural analysis of the prototype and evaluates its neutron production performance through Monte Carlo simulations. The primary goal is to support an experiment to measure the double-differential neutron yield of the Be(p,n) reaction in the 30–70 MeV range. These results will provide new experimental data to supplement current JENDL evaluations and guide the development of advanced neutron sources at NEPIR
O duplo significado do sentir e do pensar nas obras de Alberto Caeiro e Descartes
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão. Programa de Pós-Graduação em LiteraturaA pretensão desta dissertação intitulada O duplo significado do sentir e do pensar nas obras de Alberto Caeiro e Descartes é investigar a relação entre o sentir e o puro pensar, usando como referência a poesia O Guardador de Rebanhos, de Alberto Caeiro, que apresenta de forma evidente o tema; e como este assunto é tratado nas Meditações Metafísicas de René Descartes, também de forma claramente visível. Podemos perceber em ambos os autores, uma diplopia, uma espécie de duplo olhar sobre a relação sentir e puro pensar. No primeiro capítulo vou falar sobre a tese do duplo olhar de Descartes, a respeito da relação sentir e puro pensar na leitura de Merleau-Ponty, salientando a visão de natureza. No segundo capítulo, parto da leitura das três primeiras Meditações Metafísicas para caracterizar a tensão que se pode verificar entre Descartes e Alberto Caeiro quando se referem ao puro pensar. O foco principal de Descartes, nas três primeiras Meditações, é o pensar puro, e neste ponto Alberto Caeiro critica o pensar puro. No terceiro capítulo, analisando as três últimas Meditações, percebe-se que há uma virada no pensamento de Descartes, no qual o autor inverte seu ponto de vista, aproximando-se da idéia de Alberto Caeiro. No quarto capítulo, mostrarei a leitura que outros autores fazem acerca do sentir e do pensar na obra de Alberto Caeiro, mostrando que assim como Descartes, este também ostenta uma diplopia, não do sentir, mas do pensar. The pretension of this work entitled O duplo significado do sentir e do pensar nas obras de Alberto Caeiro e Descartes is to investigate the relationship between the feeling and the pure thinking, using as reference the poetry O Guardador de Rebanhos, by Alberto Caeiro, that presents in an evident way this theme; and as this subject is treated in René Descartes' Metaphysical Meditations, also in a clearly visible way. It is possible to notice in both authors, the diplopy, a sort of double look about the relationship between feeling and pure thinking. The thesis about Descartes'double look regarding the relation of feeling and pure thinking, in Merleau-Ponty reading, pointing out the nature vision, will be treated in the first chapter. In the second chapter, I start from the reading of the first three Metaphysical Meditations to characterize the tension that can be verified between Descartes and Alberto Caeiro when they refer to the pure thinking. Descartes' main focus in the first three Meditations is pure thinking and, in this point, Alberto Caeiro criticizes pure thinking. In the third chapter, analyzing the last three Meditations, it is possible to notice that there is an alteration in Descartes' thought, in which the author inverts his point of view, approaching of Alberto Caeiro's idea. In the fourth chapter, I will show the reading that other authors do concerning feeling and thinking in Alberto Caeiro's work, showing that as well as Descartes, this also shows a diplopy, not of feeling, but of thinking
Lobbying for change as a new theory and practice of active citizenship: author interview with Alberto Alemanno
No full textDo you believe that lobbying is a vehicle for representing the interests of some rather than all, meaning its actors can never be a force for good? Alberto Alemanno, author of Lobbying for Change: Find Your Voice to Create a Better Society, might convince you of the contrary. This interview with Barbara Aubin, LSE Public Affairs, reflects on the importance of engaging with our political representatives, holding them accountable and lobbying for the causes we deeply care about as fundamental elements of a healthy democracy
De público pasajero
No full textEl documental muestra la rutina, los tiempos y esfuerzos de artistas que han optado por vivir de la música en los ómnibus. Expone las variadas razones que llevan al artista a llevar este estilo de vida.Dirección y producción: Eliana Gonnet e Inés González; sonido: Mariana Garófalo y Fiorella Monetti; dirección de fotografía: Carlos Pérez . Entrevistados: Mariana Figueroa, Robert Godoy, Rodrigo Ahumada, Jaime Fernández, Sonia García, Victoria Uslenghi, Andrés Rodríguez
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