3,613 research outputs found
Pour regarder. Le Corbusier, Guido Guidi
No full textIl contributo focalizza sul costante interesse per le possibilità cognitive dello sguardo come tema che avvicina Le Corbusier al mondo della fotografia (e Guido Guidi a Le Corbusier). L’opera di Le Corbusier fino al progetto fotografico di Guidi non aveva ricevuto l’attenzione di un vero progetto di lettura fotografica. L’immagine della sua opera fotografata restava connessa alle fotografie di Lucien Hervé che avevano accompagnato il suo farsi. Il contributo illustra inoltre la nascita del progetto per il volume Le Corbusier, Scritti pubblicato da Einaudi nel 2003 e curato dall’autore di questo saggio, analizzando in percorso definito tra le opere architettoniche e soffermandosi in particolare sulla fabbrica Duval a Saint Dié.
The paper focuses on the cognitive possibilities of the gaze as a theme that brings Le Corbusier closer to the world of photography (and Guido Guidi to Le Corbusier). Le Corbusier's work didn’t receive the attention of a real photographic reading project before Guidi's photographic project. The image of his photographed work was identified by Lucien Hervé's photographs that had accompanied during its making. This contribution also illustrates how this Guidi's work has been originated by the volume Le Corbusier, Scritti edited by the author of this essay for Italian publisher Einaudi in 2003, and analyzes the path defined among the Le Corbusier buildings, focusing on particular on the Duval factory in Saint-Dié. In fact, Guidi has indelibly and definitively annotated (in the following years the building has been restored) its shades, gradations, and life through time
Sugli stemmi bipartiti. Decimazione, asimmetria e calcolo delle probabilita
No full textL’art. propone una soluzione (avvalendosi della collaborazione del fisico
nucleare Vincenzo Guidi) per il cosiddetto “paradosso di Bédier” (1928),
cioè l’assoluta prevalenza degli stemmi bipartiti. Si tratta di un problema
considerato finora pressoché insolubile che caratterizza il paradigma del
metodo filologico degli errori comuni. In primo luogo si ripercorrono le
tesi di Bédier notando che lo studioso confonde gli stemmi (i diagrammi che
rappresentano i mss. superstiti) con gli alberi reali (l’insieme di tutti i
mss. di una tradizione, compresi quelli perduti. In secondo luogo si nota
che nelle tradizioni a stampa quattro-cinquecentesche (caratterizzate da una
decimazione 300 volte meno intensa; 300 è la tiratura minima di un’edizione
del tempo) gli alberi pluripartiti non sono così rari. Si spiega quindi il
paradosso ragionando sull’asimmetria che caratterizza di regola le
tradizioni manoscritte combinata con gli effetti di una elevata decimazione
(dal 70% al 100%)
Rappresentazioni oltre la scena. Studi di genere e storia della danza in Italia. Introduzione
No full textIntroduzione alla sezione "Immaginari corporei e rappresentazioni di genere tra danza, scrittura e società" curata da Susanne Franco, in Nuove frontiere per la storia di genere, vol. III, a cura di Laura Guidi e Maria Rosaria Pelizzari, Università degli Studi di Salerno e Libreria universitaria.it edizioni
Nanoremediation: valutazione della potenziale capacità di nanoparticelle di TiO2 di contrastare gli effetti genotossici di contaminanti ambientali. approccio in vitro su biopsie branchiali di Mytilus galloprovincialis
No full textNanoremediation: valutazione della potenziale capacità di nanoparticelle di TiO2 di contrastare gli effetti genotossici di contaminanti ambientali. approccio in vitro su biopsie branchiali di Mytilus galloprovincialis
M. Bernardeschi a, P. Guidi a, M. Palumbo a, V. Scarcelli a, G. Frenzilli a
a Dipartimento di Medicina Clinica e Sperimentale, Università di Pisa. Via A. Volta, 4 56126 Pisa - [email protected]
Abstract -. Le nanoparticelle (particelle con almeno una dimensione < 100 nm), grazie alle loro peculiari caratteristiche chimico-fisiche, possono essere impiegate con successo nella bonifica di ambienti contaminati.
Si è andati a valutare in vitro, su biopsie branchiali di Mytilus galloprovincialis la potenziale capacità di nanoparticelle di biossido di titanio (anatasio 25 nm; Degussa 70% di anatasio, 21nm; anatasio mesoporoso 14 nm) di interagire con il cadmio (CdCl2), contaminante classico dell’ambiente marino, diminuendone l’effetto genotossico. Grazie al Comet assay, nella sua versione alcalina, è stata valutata da una parte la genotossicità del CdCl2, e dall’altra la capacità delle nanoparticelle di titanio di abbattere tale effetto. E’ stata inoltre indagata la frequenza di cellule apoptotiche, tramite l’utilizzo del Diffusion assay.
I risultati relativi al Comet assay, sebbene preliminari, hanno mostrato una generale riduzione del livello di danno al DNA indotto dal CdCl2 nelle co-esposizioni, sebbene solo nel caso dell’anatasio di 25 nm tale effetto sia risultato statisticamente significativo. Dall’analisi dei preparati di Diffusion assay non è emersa alcuna percentuale significativa di cellule apoptotiche, né in relazione al trattamento col solo CdCl2, né rispetto a quello in co-esposizione con il titanio. Questo dato va a supportare la fondatezza dei risultati ottenuti con il Comet assay, legati esclusivamente all’effetto dei trattamenti e non ad una elevata mortalità cellulare
UA9 -CERN
No full textThe UA9 collaboration is investigating how tiny bent crystals could improve how beams are collimated in modern hadron colliders such as the LHC.
The planes in crystalline solids can constrain the directions that charged particles take as they pass through. Physicists can use this "channelling" property of crystals to steer particle beams. In a bent crystal, for example, channelled particles follow the bend and can change their direction.
In high-energy hadron colliders, particles surrounding the beam core can be lost, damaging sensitive areas of the accelerator. Multi-stage collimation systems are usually used to absorb this beam halo. These systems are composed of massive collimators and absorbers very close to the beam. Using a tiny bent crystal as a primary collimator could deflect halo particles coherently at large angles and direct them into a secondary collimator-absorber. In this way, the massive collimator-absorber could be placed at an increased distance from the beam, reducing the complexity of the system.
The UA9 collaboration has been testing this idea since 2009, using beams from the Super Proton Synchrotron to do experiments on the collimation efficiency of silicon crystals
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Dominick Argento's Casa Guidi : a character and a musical study
No full texttextIt is not surprising that Dominick Argento’s influence is particularly strong in
the realm of American vocal music, since he considers the human voice the “original
instrument.” His thirteen operas and eight solo song cycles, to the present date,
encompass a wide range of topics and musical styles. Argento has often chosen a text
based on who will be singing a piece and on what type of character will be portrayed
through the singer. Ultimately, this characterization directly shapes the ensuing
musical style forged by Argento. The way in which Argento brings musical life to
the letters of Elizabeth Barrett Browning in the cycle Casa Guidi is the topic of this
study.
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Argento set texts from personal letters of Mrs. Browning. Biographical
details surrounding each song text and musical analysis of each song will aid the
reader in orientation to the 1983 work. A performance guide is offered for each of
the five songs that comprise the cycle, as well as a brief section on Casa Guidi’s
pedagogical value. This treatise also explores some of the differences between Casa
Guidi and Argento’s other solo song cycle for mezzo-soprano, From the Diary of
Virginia Woolf. The primary goal of this comparison is to illustrate how the
contrasting personalities and words of Virginia Woolf and Elizabeth Barrett
Browning led Argento to very different musical results. The transcript of a phone
interview with Dominick Argento concludes the treatise.Musi
PEARL - ERC
No full textThe PEARL project aims at advancing the technologies for manufacturing of high quality Periodically Bent Crystals (PBCr). The PBCr developed in the course of this project will be utilised for the con-struction of novel light sources of high-energy (hν≥102 keV up to GeV range) monochromatic elec-tromagnetic radiation by means of a Crystalline Undulator (CU). The technological and experi-mental part of this project will be accompanied by the complimentary advanced theoretical research utilising modern theoretical, computational and modelling methods accomplished with high perfor-mance computing techniques. A broad interdisciplinary, international collaboration has been created in the frame of FP7 PIRSES-CUTE project, which was focused on initial experimental tests of the CU idea and the related theory, for review see. This project has been successfully completed in March 2015 and left the matter experimentally validated to a degree that is tantalising, requiring further exper-imentation. In particular CUTE elucidated the demand on manufacturing PBCrs of an exceptional lat-tice quality, their experimental characterisation and exposure against the high quality beams of ultra-relativistic electrons and positrons for the observation of the strong coherent effects in the photon emission process. PEARL will focus on solving the whole complex of the important technological, ex-perimental and theoretical problems aiming to achieve the major breakthrough in this important re-search area. The PEARL international collaboration is extended with respect to CUTE and involves the new partners with the essential, necessary, complementary expertise and experimental facilities. The PEARL research programme is highly collaborative and requiring numerous exchange visits between the involved laboratories, joint workshops and conferences. Therefore, RISE type of project is the most suitable for strengthening of this very essential, ongoing, international collaborative research
Electromagnetic radiation accompanying multiple volume reflection in one crystal
No full textAn interpretation of the first experiment on gamma-radiation of 120 GeV positrons experiencing multiple volume reflection from planes of one bent crystal is given. An increase of radiation of 10–20 GeV gamma quanta by multiple
reflection from skewed planes is demonstrated. Also a considerable influence of the axial field on both hard and soft parts of the positron radiation spectrum is revealed
How to make coherent bremsstrahlung circularly polarized
No full textIt is shown that if high energy positrons are moving in planar channeling conditions in a bent crystal at a small angle with respect to atomic strings which form the bent channeling planes, the hard part of the spectrum of gamma radiation emitted by the positrons will be highly circularly polarized. This Circularly Polarized String-of-Strings Radiation of Positrons Channeled in Bent Crystal (CPSOSRPCHBC) can be considered as a circularly polarized coherent bremsstrahlung manifesting itself efficiently from sub-GeV up to TeV and higher positron energies. The possibility to observe the CPSOSRPCHBC at the 500MeV positron beam of Frascati National Laboratory is considered
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