7,011 research outputs found
Bistecche e braciole
No full textStudio della ricorrenza delle parole e degli alimenti "braciola" e "bistecca" nella letteratura italiana, con attenzione alla funzione narrativa, alla caratterizzazione per esse di contesti sociali e di personaggi, nonché delle metafore e delle simbologie derivate anche nell'uso comune, oltre che letterario
Testing the equivalence principle in space after the MICROSCOPE mission
No full textTests of the weak equivalence principle (WEP) can reveal a new, composition dependent, force of nature, or disprove many models of new physics. For the first time, such a test is being successfully carried out in space by the MICROSCOPE satellite. Early results show no violation of the WEP sourced by the Earth for Pt and Ti test masses with random errors (after 8.26 d of integration time) of about 1 part in 1014 and systematic errors of the same magnitude. This result improves by about 10 times over the best ground tests with rotating torsion balances despite 70 times less sensitivity to differential accelerations, thanks to the much stronger driving signal in orbit. The measurement is limited by thermal noise from internal damping in the gold wires used for electrical grounding, related to their fabrication and clamping. This noise was shown to decrease when the spacecraft was set to rotate faster than planned. The result will improve by the end of the mission, as thermal noise decreases with more data. Not so systematic errors. We investigate major nongravitational effects and find that MICROSCOPE's "zero-check" sensor, with test masses both made of Pt, does not allow their separation from the signal. The early test reports an upper limit of systematic errors in the Pt-Ti sensor, which are not detected in the Pt-Pt one, hence would not be distinguished from a violation. Once all the integration time available is used to reduce random noise, there will be no time left to check systematics. MICROSCOPE demonstrates the huge potential of space for WEP tests of very high precision and indicates how to reach it. To realize the potential, a new experiment needs the spacecraft to be in rapid, stable rotation around the symmetry axis (by conservation of angular momentum), needs high quality state-of-the-art mechanical suspensions as in the most precise gravitational experiments on ground, and must allow multiple checks to discriminate a violation signal from systematic errors. The design of the "Galileo Galilei" (GG) experiment, aiming to test the WEP to 1 part in 1017 unites all the needed features, indicating that a quantum leap in space is possible provided the new experiment heeds the lessons of MICROSCOPE
[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
Il collezionismo dei Ruffo
No full textViene segnata una linea di continuità nel collezionismo dei diversi rami della famiglia Ruffo, a partire dal vincolante esempio di Don Antonio, Principe della Scaletta. Le componenti del gusto collezionistico vengono indagate sia in rapporto all'epistolario, dal quale emergono i contatti diramati che intercorsero con i maggiori artisti italiani e stranieri del Seicento, sia in merito agli inventari, che consentono di registrare il progressivo accrescimento del nucleo collezionisti. Dal confronto tra il ramo di Bagnara e quello di Scilla risulta accresciuto l'interesse per la pittura napoletana del Settecento, che pertanto viene analizzato attraverso un nucleo di opere rintracciate, che ha permesso di rettificare alcune precedenti proposte attributive
Piero Camporesi e gli editori: dai Mondadori a Livio Garzanti, dopo il Mulino
No full textRicorrendo all'archivio privato di Piero Camporesi - scienziato e nel contempo scrittore - e agli archivi editoriali coinvolti si ricostruisce il rapporto di Piero Camporesi, docente universitario e intellettuale dell'Italia del secondo Novecento, il quale pubblicò propri scritti con il Mulino, con la casa editrice Mondadori, con Alberto Mondadori e il suo Saggiatore, e con altri editori di primo livello, sia nazionale sia internazionale, come Livio Garzanti. Le carte restituiscono tanto la genesi delle collaborazioni editoriali quanto il difficile e a volte tormentato percorso che le opere di Camporesi, ancora oggi tradotte in molte lingue straniere e ristampate in Italia, ebbero alla ricerca dei loro lettori
Provincia de Tierra del Fuego, Antártida e Islas del Atlántico Sur, República Argentina
No full textFil: Mendía, José. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales; Argentina.Fil: Anselmi, Gabriela. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales; Argentina.Fil: Negro, Claudia. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales; Argentina.Fil: Panza, José Luis Alberto. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales; Argentina.Fil: Benítez, Javier. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales; Argentina
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
Relevance of the weak equivalence principle and experiments to test it: Lessons from the past and improvements expected in space
No full textTests of the Weak Equivalence Principle (WEP) probe the foundations of physics. Ever since Galileo in the early 1600s, WEP tests have attracted some of the best experimentalists of any time. Progress has come in bursts, each stimulated by the introduction of a new technique: the torsion balance, signal modulation by Earth rotation, the rotating torsion balance. Tests for various materials in the field of the Earth and the Sun have found no violation to the level of about 1 part in 10(13). A different technique, Lunar Laser Ranging (LLR), has reached comparable precision. Today, both laboratory tests and LLR have reached a point when improving by a factor of 10 is extremely hard. The promise of another quantum leap in precision rests on experiments performed in low Earth orbit. The Microscope satellite, launched in April 2016 and currently taking data, aims to test WEP in the field of Earth to 10(-15), a 100-fold improvement possible thanks to a driving signal in orbit almost 500 times stronger than for torsion balances on ground. The 'Galileo Galilei' (GG) experiment, by combining the advantages of space with those of the rotating torsion balance, aims at a WEP test 100 times more precise than Microscope, to 10(-17). A quantitative comparison of the key issues in the two experiments is presented, along with recent experimental measurements relevant for GG. Early results from Microscope, reported at a conference in March 2017, show measurement performance close to the expectations and confirm the key role of rotation with the advantage (unique to space) of rotating the whole spacecraft. Any non-null result from Microscope would be a major discovery and call for urgent confirmation; with 100 times better precision GG could settle the matter and provide a deeper probe of the foundations of physics
Porci e maiali
No full textStudio della raffigurazione e del significato della figura del maiale nella tradizione scritta italiana (letteraria, saggistica, religiosa...), attento alle sue relazioni con l'epica classica e i testi sacri (la Bibbia in particolare), ma soprattutto all'uso di questa figura come metafora, allegoria, epiteto nel corso dei secoli, fino ai nostri giorni
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