695 research outputs found
Crós (Claudi R.). La Civilisation afro-brésilienne
No full textDianteill Erwan. Crós (Claudi R.). La Civilisation afro-brésilienne. In: Archives de sciences sociales des religions, n°104, 1998. p. 142
Crós (Claudi R.). La Civilisation afro-brésilienne
No full textDianteill Erwan. Crós (Claudi R.). La Civilisation afro-brésilienne. In: Archives de sciences sociales des religions, n°104, 1998. p. 142
La civilisation afro-brésilienne / Claudi R. Cròs,...
No full textCollection : Que sais-je ? ; 3170Collection : Que sais-je ? ; 3170Contient une table des matièresAvec mode text
The development of an SPH tree-based algorithm to investigate the evolution of self-gravitating Protoplanetary Disks
No full textI Dischi Circumstellari costituiscono un campo di studio molto moderno, per diverse ragioni. Prima di tutto, lo studio dell'evoluzione di tali sistemi mira a spiegare la configurazione delle migliaia di sistemi planetari che sono stati osservati fin ora, e può fornire risposte importanti anche sulla formazione del Sistema Solare.
In secondo luogo, gli sviluppi delle tecnologie interferometriche nella banda Infrarossa e Millimetrica hanno fornito un ampia gamma di possibilità di osservare i dischi con una risoluzione angolare molto piccola. I dischi hanno dunque rappresentato un ampio target osservativo che ha stimolato non in maniera indifferente l'applicazione e il miglioramento delle più avanzate tecniche osservative.
Inoltre, l'evoluzione dei dischi è guidata da diversi processi fisici, sia dinamici sia idrodinamici, e dunque essi figurano tragli oggetti di studio più importanti a cui applciare sofisticate tecniche di modellistica numerica.
In particolare, i dischi Protoplanetari sono diventati, dagli ultimi due decenni, un obbiettivo chiave nel campo dei sistemi stellari multipli. La loro evoluzione in ambienti eterogenei ricchi di stelle e gas rappresenta una nuova frontiera del calcolo numerico applicato all’astronomia, perché implica numerosi problemi ancora irrisolti. Le recenti scoperte di dischi in ammassi aperti ha aperto a nuove prospettive nello studio teorico di sistemi planetari extrasolari nel loro stato primordiale gassoso.
Per queste ragioni, l’attività del mio Dottorato ha come scopo l’implementazione di uno strumento di modellistica numerico, capace di affrontare questi e molti altri problemi legati all’interazione tra gas e stelle. In questo documento, il Sottoscritto presenterà un nuovo algoritmo sviluppato per integrare l’evoluzione temporale di sistemi gassosi (con o senza gravità) e la loro interazione con le stelle. Il codice si basa sul ben noto approccio Smoothed Particles Hydrodynamics (SPH), e contiene un metodo numerico per accoppiare il cas con un limitato numero di punti di massa calcolando, con elevata precisione, la loro mutua interazione gravitazionale. Il calcolo dell’autogravità è fatto approssimando la forza mediante il noto Tree-Scheme.
Dopo aver descritto alcuni test basilari sulla stabilità e sulle prestazioni, il Sottoscritto descriverà il problema astrofisico principale studiato durante il lavoro di dottorato: l’evoluzione di dischi protoplanetari perturbati da stelle che effettuano incontri ravvicinati, che cistituisce uno schema approssimato del più complesso caso di interazione di un disco con l’ambiente stellare in cui esso è immerso.Circumstellar Disks represent a very modern object of investigation, for many reasons. First, the investigation on their evolution aims at explaining the configuration of several thousand of planetary systems detected so far and may give important answers even on the formation of Solar System. Secondly, the early development of the interferometric technique to observe in the infrared and mm wave-length, opened a wide range of possibilities to observe disks with very short angular resolution. Thus, Disks constitute a wide target, stimulating the application and the improvement of the most advanced observational techniques. Moreover, disk evolution is driven by several physical processes, both dynamical and hydrodynamical, they are indeed one of the most important objects of application of several sophisticated numerical techniques.
Protoplanetary disks have become, since the last 20 years, a key target in the field of star clusters. Their evolution in heterogeneous environments rich in stars and gas represents a new frontier for the Numerical Astronomy because it carries several issues still not overcome. The recent discoveries of circumstellar disks in open clusters opened to new perspectives to the theoretical investigations of non-isolated exoplanetary systems in their primordial gaseous state.
For such purposes, my PhD activity aimed at building a suitable numerical investigating instrument, able to face this and many other problems related to the interaction between gaseous systems and stars. In this document, I will present a new Algorithm developed to treat the evolution of gaseous systems (both selfgravitating and non-selfgravitating) and their interaction with Stars. The Code is based on the well-known Lagrangian Smoothed Particle Hydrodynamics approach, and contains a numerical technique to couple a gas distribution with a few amounts of point-mass particles, evaluating,
with high precision, their motion. The calculus of self-gravity is accomplished with a tree-scheme approach.
After describing some basic stability and performance tests, I will focus on the main problem investigated during my work: the evolution of protoplanetary disks perturbed by passing-by stars, which constitute an approximated scheme of the more complex disk-stellar environment interaction
RATS: an Italian project for exoplanets transit search
No full textThe automatic photometric pipeline provides a real time images reduction and directly the light curves of object in the field within the RATS project (RAdial Velocities Transit Search). The light curves themselves will be analyzed in order to catch light dimming due to a transit. For this purpose, the algorithm needs as input files a list of fits images taken at Schmidt Telescope of Asiago (INAF, Italy), a reference master list of stars and three files with the optional parameters for the DAOPHOT photometry package (Stetson 1987, PASP, 99, 191). The master list is previously obtained from a photometric characterization of the field (for more details: http://www.rats.it and Claudi et al. 2006, in Observatoire de Haute Provence Colloquium, Tenth Anniversary of 51 Peg-b: Status of and prospects for hot Jupiter studies, 22-25 August 2005, eds. Arnold, L., Bouchy, F. and Moutou, C., 350)
Interventi edilizi sostenibili
No full textLe Legge regionale 19/2009, ha costituito la risposta campana all’intesa raggiunta e formalizzata, in sede di Conferenza Unificata Stato– Regioni – Enti locali, nell’aprile 2009, determinata a contrastare la crisi economica in atto. La legge campana è finalizzata al contrasto della crisi economica e alla tutela dei livelli occupazionali, attraverso il rilancio delle attività edilizie nel rispetto degli indirizzi di cui alla legge regionale 13 ottobre 2008, n. 13 (Piano territoriale regionale), al miglioramento della qualità urbana ed edilizia utilizzando criteri di sostenibilità nella progettazione con particolare riferimento alle tecnologie passive ed ecosostenibili
Claudio Claudi: un episodio sconosciuto di umanesimo nel secolo breve. Biografia intellettuale, introduzione critica ed edizione filologica di Realtà e valore.
No full textThis work looks into the rebuilding of the historical memory about the Claudi family, paying
particular attention in studying Claudio Claudi’s work, firstborn of his family.
There are no significant scientific studies about his thoughts yet, many of them aren’t even
published and properly filed yet. The Claudi foundation began to digitalize and set up the large
amount of autograph material stored.
The first chapter is dedicated to the biographic rebuilding, through a careful reading of all the texts
composed by Claudio Claudi. To furfill this goal, a preliminary storage of documents was
necessary, in order to find out sources and to know cultural contexts attended by the author.
This rebuilding showed us a deep bound between his life occurences and the worth of his writing.
The intellectual activity is conceived as the only devise to purchase a meaning for an hard life,
dominated by a sense of failure. The goal of Claudi as author is to achieve his own, absolute and
eternal dimension and his writings must be read being aware of this practical-religious and magical
purpose.
Once the rebuilding is finished, the work looks into the unedited text Reality and value. Riflection
around philosophy, wich Claudi began to write October 29 1949 and ended June 30 1951 in Rome.
To understand the complexity and peculiarity of this essay was necessary firstly to frame studies
around Claudi’s image, philological criteria used for the commentary of the work and the general
structure of the documentary-historical Fund. This aspect is developed in the second chapter. In the
third chapter there is a comment to the contents of Reality and value. During text analysis we tried
to follow the talking points conceived by the author. This criterion allows us to proof the originality
and evolution of Claudi’s thaughts, but sometimes doesn’t help in clearly expose the work.
In Reality and value the author resumes themes from his meditation, summarizing them in way
wich guarantees to the subject to discover himself as an absolute entity. Reality and value was
transcribed following philological criteria of the genetic approach. Once we decided the definitiveautograph version to put down, we brang also the variants in the work in order to show how the
author approaches to the final drafting of the essay. At the end of the work we added two unedited
variants of the first chapter in the Appendyx, wrote by the author more or less in the Fifties. To help
the reader “to in his hand” the image of Claudi. The work finishes with some scans of his
transcribed texts.
The methodolgy involved was the genealogical recostruction of thaughts of the author and
memebers of his family. This method was functional in building the archive, setting the research towards Claudi’s thought following an hypothetical historical development. Indeed, genealogical
method offers devices to understand if the author’s production can be considered as the
development and the confirm of an original idea expressed in many forms, or if we must see it
without a common base and marked by different benefits, wich are summarised in an eclectic
personality, unpleased to face the public
The Master's Degree: an Academic Exercise or Foreshadowing the Future?/Master: esercitazione o prefigurazione del futuro?
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