74 research outputs found
è nostra. L’energia La democrazia energetica passa sia attraverso l’autonomia, sia dalla nascita di nuovi soggetti: dal basso
No full textDysplasic femur in total hip replacement”, Abstract from the 2013 congress of the Italian hip society
No full textSuper computers in astrophysics and High Performance simulations of self-gravitating systems
No full textThe modern study of the dynamics of stellar systems requires the use of high-performance computers. Indeed, an accurate modelization of the structure and evolution of self-gravitating systems like planetary systems, open clusters, globular clusters and galaxies imply the evaluation of body-body interaction over the whole size of the structure, a task that is computationally very expensive, in particular when it is performed over long intervals of time. In this report we give a concise overview of the main problems of stellar systems simulations and present some exciting results we obtained about the interaction of globular clusters with the parent galaxy
IL FEMORE DISPLASICO NELLA PROTESIZZAZIONE DELL’ANCA Dysplasic femur in total hip replacement
No full textBackground. Total hip arthroplasty is actually the most common
solution for the treatment of hip dysplasia. Even if the anatomical
changes of the acetabular region are more often involved in
making this procedure challenging, also the dysplasic femur hasto be considered in a precise pre-operative surgical planning.
An increase of the femoral neck anteversion togheter with an
alteration of the inclination are the most common anatomical
femoral problems. A reduction in the diameter of the medullary
canal and a straightening of the proximal medial curvature of
the femur is also described. These anatomical alterations are
worse in the presence of an hip subluxation or luxation. Challenging
in THA can arise also after femoral osteotomies.
Aims. Aim of this work is to describe, following current issues
present in literature and authors personal experience, indications
and results in total hip arthroplasty in the presence of femoral
dysplasia.
Methods. A review of the literature and a retrospective revision
of our patients that underwent total hip arthroplasties in dysplasic
hips is described.
Results. From our experience on 56 femoral stems, an uncemented
cone-shaped stem is preferred even if anatomical stems were
also used in selected patients with a good outcome.
Conclusion. Since a wide variability across the anatomical
changes is present in different individuals, an accurate preoperative
CT scanning of the proximal femur has to be taken
for making a correct decision before an hip replacement for
dysplasic anomalies
Formation and evolution of clumpy tidal tails around globular clusters
No full textPublished in Astronomische Nachrichte
Simulations of globular clusters merging in galactic nuclear regions
No full textWe present the results of detailed N-body simulations regarding the interaction of four massive globular clusters in the central region of a triaxial galaxy. The systems undergo a full merging event, producing a sort of 'Super Star Cluster' (SSC) whose features are close to those of a superposition of the individual initial mergers. In contrast with other similar simulations, the resulting SSC structural parameters are located along the observed scaling relations of globular clusters. These findings seem to support the idea that a massive SSC may have formed in early phases of the mother galaxy evolution and contributed to the growth of a massive nucleus
La vocazione teatrale di Alessandro Carli. Un tentativo di riforma delle scene nella Verona del secondo Settecento.
No full textNella tesi si esplora la personalità artistica del tragediografo veronese Alessandro Carli (1740-1814), esaminandola nel complesso della sua attività teatrale, analizzata sia sul piano della drammaturgia che su quello dell’allestimento scenico. Una volta inquadrata la situazione specifica dell’ambiente teatrale veneto tardosettecentesco, tra le istanze di cambiamento successive alla riforma goldoniana e l’influenza della cultura francese, vengono vagliate la composizione e le rappresentazioni delle tragedie "Telane ed Ermelinda", "I Longobardi" e "Ariàrato", nonché i riscontri di pubblico che conseguono. La ricerca mette in luce il progetto di rinnovamento perseguito dall’autore veronese, fondato, da un lato, sulla particolare attenzione dedicata al momento performativo (che si esplica tra le recite di nobili dilettanti e la messa in scena delle compagnie professionali), dall’altro, sulla necessità di una seria formazione attoriale, da affidare alla figura di un maestro di recitazione in grado di assumere anche funzioni di coordinamento.In this thesis is explored the artistic personality of Alessandro Carli (1740-1814), a playwright of tragedies from Verona. His work is examined both from dramaturgical and scenical point of view. Once investigated the specific theatrical context of Veneto in the late Eighteenth century (a context separated between the changing issues coming from the Goldonian reform and the influences of French culture), we analyse the writing structure and some representations of the three tragedies written by Carli ("Telane ed Ermelinda", "I Longobardi" and "Ariàrato"), and the success they gained on the stage. Our study enlightens the project of reform carried out by the Veronesian author: on one side, his project is based on the special attention given to the performing practice (caught between theatrical stagings by noble amateurs or by professional comedians), on the other, on the necessity to form new actors, guided by an acting master, who should also directed them on the stage
N-body simulations of Globular Cluster-like systems
No full textThe dynamics of self-gravitating globular cluster-like systems, containing N = 10(5) stars, has been simulated for 6 - 10 crossing times. We followed the evolution of three different spherical systems. The first two are quasi-virialized clusters, (with and without the presence, in the centre of mass, of a black hole); the third case regards the initial violent collapse of a spherical system.The dynamics of self-gravitating globular cluster-like systems, containing N = 10(5) stars, has been simulated for 6 - 10 crossing times. We followed the evolution of three different spherical systems. The first two are quasi-virialized clusters, (with and without the presence, in the centre of mass, of a black hole); the third case regards the initial violent collapse of a spherical system
Globular cluster merging in the inner galactic region
No full textThe dynamics of the encounter of two globular clusters made up of 105 stars each in the bulge of an elliptical galaxy has been followed up to 15 orbital periods (1.7*107 years) by mean of a direct summation code. Aim of these simulations is to understand whether the merging of a group of globular clusters in a unique stellar system is possible in the central regions of galaxies before the strong coupled bulge-nucleus tidal actions destroy them. As a
matter of fact three dynamical mechanisms act in competition during the
merging of two globular clusters. The galactic tidal action tends on one side to break up clusters before they form a unique self-gravitating system; on the other side the same tidal force has also the effect to convert translational kinetic energy into internal random motion thus leading slowly clusters to inner galactic regions. Additionally the dynamical friction caused by the stellar field decelerates significantly the cluster orbital decay. Due to the non-linearity of the interactions among these mechanisms reliable results can be achieved just via detailed numerical simulations as those we present here
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