26,765 research outputs found
Measurements of and at LEP
No full textThe measurements of R/sub b/ and R/sub c/, the fraction of hadronic Z boson decays into bb and cc final states, provide a tight test on the Standard Model. The LEP experiments achieved a precision on the R/sub b/ measurements at the $9 0.4 3.959305e-309vel and an accuracy on R/sub c/ at the 3-7.748597e-304vel. The analysis techniques are reviewed and the current results are presented. (33 refs)
Monitoraggio topografico e fotogrammetrico della cupola del teatro Massimo
No full textL’articolo riporta i primi risultati di uno studio finalizzato al monitoraggio delle
deformazioni della cupola del Teatro Massimo di Palermo provocate dalle dilatazioni termiche, con
l’impiego di tecniche topografiche e fotogrammetriche integrate. In particolare, sono state utilizzate
due stazioni totali robotizzate e sistemi di fotogrammetria digitale di elevata precisione. Per
correlare gli spostamenti dei carrelli sui quali poggia la struttura in acciaio della cupola con i
gradienti termici, sono state acquisite immagini termiche diversificate. L’obiettivo principale del
lavoro consisteva nel confronto delle due tecniche di rilievo in relazione a misure di deformazione
di entità molto ridotta (sub-millimetrica). I risultati ottenuti dimostrano che i carrelli funzionano
ancora correttamente. Infatti, per un gradiente termico di 6°C misurato dalla termo camera,
entrambe le tecniche topografiche e fotogrammetriche hanno evidenziato spostamenti dell’ordine di
0.8 mm, in accordo con le previsioni del modello deformativo teorico
Rotationally invariant slave bosons for strongly correlated superconductors
No full textWe extend the rotationally invariant formulation of the slave-boson method to superconducting states. This generalization, building on the recent work by Lechermann et al. [Phys. Rev. B 76, 155102 (2007)], allows to study superconductivity in strongly correlated systems. We apply the formalism to a specific case of strongly correlated superconductivity, as that found in a multiorbital Hubbard model for alkali-doped fullerides, where the superconducting pairing has phonic origin, yet it has been shown to be favored by strong correlation owing to the symmetry of the interaction. The method allows to treat on the same footing the strong correlation effects and the interorbital interactions driving superconductivity, and to capture the physics of strongly correlated superconductivity, in which the proximity to a Mott transition favors the superconducting phenomenon. RI Capone, Massimo/A-7762-200
Rheediinosides A and B, two antiproliferative and antioxidant triterpene saponins from Entada rheedii
No full textTwo triterpenoid saponins have been isolated from the seed kernels of Entada rheedii. Their structures
have been established using 1D- and 2D-NMR and mass spectrometry as 3-O-b-D-xylopyranosyl-
(1 -3)-O-a-L-arabinopyranosyl-(1 -6)-2-acetylamino-2-deoxy-b-D-glucopyranosylentagenic acid 28-
O-b-apiofuranosyl-(1-3)-b-D-xylopyranosyl-(1 -2)-b-D-glucopyranoside (Rheediinoside A, 1) and
3-O-b-D-glucopyranosyl-(1 -3)-O-[b-D-xylopyranosyl-(1-3)-a-L-arabinopyranosyl-(1 -6)]-2-acetylamino-
2-deoxy-b-D-glucopyranosylentagenic acid 28-O-b-apiofuranosyl-(1-3)-b-D-xylopyranosyl-
(1-2)-b-D-glucopyranoside (Rheediinoside B, 2). Compounds 1 and 2 were tested for their antiproliferative
activity against T98G, A431, PC3 and B16-F1 cell lines, and further for their antioxidant properties.
Moderate cytotoxic potency and antioxidant properties were found for these compounds whereas Rheediinoside
B was in all assays more active than Rheediinoside A
Recuerdos de Massimo.
No full textEl presente ensayo recuerda la rica relación personal e intelectual entre Massimo Pavarini e Iñaki Rivera Beiras desde que el segundo conoció siendo muy joven a Pavarini. En ese sentido, el trabajo recuerda los inicios de su fecunda relación en la ciudad de Bologna cuando Iñaki Rivera acudía a presentar a Massimo Pavarini los desarrollos de lo que sería su tesis doctoral. Las contribuciones de Pavarini al proceso de aprendizaje de Rivera, en el terreno de una epistemología crítica en la penología contemporánea, son analizados como un homenaje a la memoria y a la obra del autor italiano, tras su fallecimiento en septiembre de 2015.This paper recalls the rich personal and intellectual relationship between Massimo Pavarini and Iñaki Rivera Beiras. In that sense , the work recalls the beginning of his fruitful relationship in the city of Bologna when Iñaki Rivera came to present Massimo Pavarini’ developments in what would be his PhD thesis. Pavarini contributions to the learning process of Rivera, on the ground of a critical epistemology in contemporary penology , are analyzed as a tribute to the memory and to the work of Italian author, after his death in September 2015 .El presente ensayo recuerda la rica relación personal e intelectual entre Massimo Pavarini e Iñaki Rivera Beiras desde que el segundo conoció siendo muy joven a Pavarini. En ese sentido, el trabajo recuerda los inicios de su fecunda relación en la ciudad de Bologna cuando Iñaki Rivera acudía a presentar a Massimo Pavarini los desarrollos de lo que sería su tesis doctoral. Las contribuciones de Pavarini al proceso de aprendizaje de Rivera, en el terreno de una epistemología crítica en la penología contemporánea, son analizados como un homenaje a la memoria y a la obra del autor italiano, tras su fallecimiento en septiembre de 2015
Il cantiere della cappella Massimo di Perino del Vaga in Trinità dei Monti: cronologia e modelli decorativi
No full textModelli e cronologia del cantiere architettonico e decorativo della cappella Massimo in Trinità dei Mont
Interplay of strong correlation and Jahn-Teller effect in orbitally degenerate systems
No full textWe study the unconventional insulating state in A(4)C(60) by means of the dynamical mean-held theory. The interplay between the electron-electron correlation and the Jahn-Teller interaction determines the properties of these compounds. The system is a Mott-Jahn-Teller insulator. In that state, conduction between molecules is blocked by on-site Coulomb repulsion, magnetism is suppressed by intra-molecular Jahn-Teller effect, and important excitations (such as optical and spin gap) are found to be essentially intra-molecular. Experimental values of the optical and spin gaps are recovered by our calculations. RI Capone, Massimo/A-7762-200
Going Forward from B to A? Proposals for the Eurozone Crisis
No full textAfter reviewing the main determinants of the current Eurozone crisis, this paper discusses the feasibility of introducing fiscal currencies as a way to restore fiscal space in peripheral countries, such as Greece, which have so far adopted austerity measures in order to abide by their commitments with Eurozone institutions and the IMF. We show that the introduction of fiscal currencies would speed up the recovery, without violating the rules of Eurozone Treaties. At the same time, these processes could help the transition of the euro from its current status of single currency to a status of “common clearing currency” along the lines proposed by Keynes at Bretton Woods as a system of international settlements. Eurozone countries could therefore move from “Plan B” aimed at addressing member state domestic problems, to a “Plan A” of a better European monetary system
Competition between d-wave superconductivity and antiferromagnetism in the two-dimensional Hubbard model
No full textWe study the competition of antiferromagnetism and d-wave superconductivity at zero temperature in the two-dimensional Hubbard model using cellular dynamical mean-field theory for a 2x2 plaquette, and solve the associated cluster impurity model at zero temperature by means of exact diagonalization. The interplay between the two phases depends strongly on the strength of the correlation. At strong coupling (U greater than or similar to 8t) the two phases do not mix, and a first-order transition takes place as a function of doping between two pure phases. At weak coupling (U less than or similar to 8t) the two order parameters coexist within the same solution in a range of doping and the system smoothly evolves from the antiferromagnet to the superconductor. When the transition between the superconducting and the antiferromagetic phases is of the first-order, it is accompanied by a phase separation. RI Capone, Massimo/A-7762-200
Sul massimo numero di circuiti omocentrici che puô presentare una curva algebrica piana dotata o no di singolarità
No full textRosina B. A. Sul massimo numero di circuiti omocentrici che puô presentare una curva algebrica piana dotata o no di singolarità. In: Bulletin de la Classe des sciences, tome 59, 1973. pp. 570-583
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