167 research outputs found
Mosaici di età imperiale da Lecce. Nuove Acquisizioni,. I pavimenti musivi : motivi decorativi e cronologia
No full textsi presentano alcuni frammenti di mosaico inediti da Lecc
La cultura figurativa di età romana nell'alto Tirreno cosentino
No full textPresentazione di ritrovamenti di scultura romana dal territori
Aedes Barberinae.
No full textSi tratta dell'ipertesto della prima deizione di Aedes Barberinae 1642, della stesura preparatoria Ms Barb. Lat. 2317, de Il Pellegrino, descrizione manoscritta della volta di Pietro da Cortona attribuita a F. Bracciolini. Si aggiungono
Spiegazione delle Pitture, anonima descrizione settecentesca della medesima volta. A completare il quadro delle collezioni del palazzo offerto in Aedes Barberinae si è inserito anche l'ipertesto di D. Panaroli, Museum Barberinum, 1656, catalogo dei naturalia e delle curiosità e delle piccole antichità conservate negli ambienti annessi alla Biblioteca Barberin
One-loop effective potential in M4 x T2 with and without 't hooft flux
No full text43 pages, 3 figures.We review the basic notions of compactification in the presence of a back-
ground flux. In extra-dimentional models with more than five dimensions, Scherk
and Schwarz boundary conditions have to satisfy’t Hooft consistency conditions.
Different vacuum configurations can be obtained, depending whether trivial or
non-trivial’t Hooft flux is considered. The presence of the “magnetic” back-
ground flux provide, in addition, a mechanism for producing four-dimensional
chiral fermions. Particularizing to the six-dimensional case, we calculate the
one-loop effective potential for a U(N) gauge theory on M4 × T 2. We firstly
review the well known results of the trivial ’t Hooft flux case, where one-loop
contributions produce the usual Hosotani dynamical symmetry breaking. Finally
we applied our result for describing, for the first time, the one-loop contributions
in the non-trivial’t Hooft flux case.The work of A.F. Faedo, D. Hernandez and S. Rigolin has been partially
supported by CICYT through the project FPA2006-05423 and by CAM through the
project HEPHACOS, P-ESP-00346. D. Hern´andez acknowledges financial support
from the MEC through FPU grant AP-2005-3603. S.Rigolin aknowledges also the
partial support of an Excellence Grant of Fondazione Cariparo and of the European
Programme “Unification in the LHC era” under the contract PITN-GA-2009-237920
(UNILHC)Peer reviewe
Vivere con gli antichi.Una pittura antica a Palazzo Barberini e la sua fruizione tra XVII e XVIII sec
No full textUn frammento di pittura romana della collezione Barberini studiato attraverso le testimonianze grafiche, leggendoneanche le integrazioni nel contesto della propaganda familiare dei Barberini
Consistent truncations with massive modes and holography
No full textWe review the basic features of some recently found consistent Kaluza-Klein truncations including massive modes. We emphasize the general ideas underlying the reduction procedure, then we focus on type IIB supergravity on 5-dimensional manifolds admitting a Sasaki-Einstein structure, which leads to half-maximal gauged supergravity in five dimensions. Finally, we comment on the holographic picture of consistency
Verso il saper vedere l'arte antica. Testimonianze dal Seicento romano
No full textSi osserva come la focalizzazione sul soggetto possa rendere irrilevanti per l'osservatore del Seicento le incongruenze dimensionali nell'accostamento di statue in gruppi negli allestimenti collezionistici e si mostra come una corretta lettura dell'iconografia porti già nel XVII sec. a correggere false attribuzioni
BPS domain walls in N=4 supergravity and dual flows
No full textWe establish the conditions for supersymmetric domain wall solutions to N = 4 gauged supergravity in five dimensions. These read as BPS first-order equations for the warp factor and the scalar fields, driven by a superpotential and supplemented by a set of constraints that we specify in detail. Then we apply our results to certain consistent truncations of IIB supergravity, thus exploring their dual field theory renormalization group flows. We find a universal flow deforming superconformal theories on D3-branes at Calabi-Yau cones. Moreover, we obtain a superpotential for the solution corresponding to the baryonic branch of the Klebanov-Strassler theory, as well as the superpotential for the flow describing D3 and wrapped D5-branes on the resolved conifold
Prevalence of Postoperative Complications of Autologous and Heterologous Cranioplasty in the Pediatric Population: A Systematic Review of the Literature
No full textIntroduction: Cranial reconstruction (CR) is a neurosurgical procedure performed to restore the cranial vault after a decompressive craniectomy. There are contrasting reports from the literature about the complications related to the use of heterologous materials for CR in the pediatric population. In this study, the authors try to better define such a rate of adverse events for autologous and heterologous materials. Materials and Methods: A systematic review of articles published up to December 2021 was performed. Studies were included if they reported the specific use of cranioplasty materials following craniectomy in patients younger than 18 years of age and had a minimum follow-up of at least 1 year. Results: A total of 20 studies were selected. A total of 544 cases were included, of which 422 (77.6%) were with heterologous materials and 122 (22.4%) with autologous bone. The mean average age was 9.5 years. Polyetheretherketone and polymethylmethacrylate reported 29% and 33.3%, respectively, of complications, but only 3% and 5.6% of surgical revision. PHA reported a rate of 11.9%. Titanium reported 9.2% of complications and 4.1% of surgical revisions. Porous polyethylene had a complication rate of 36.4% and a revision rate of 0%. Conclusion: There is still no perfect material for CR. It seems that heterologous materials are superior to autologous bone for CR in children, and we may consider, whenever economic conditions will allow it, to use alloplastic material as first-line in small children
Effects of 30% v/v biodiesel/diesel fuel blend on regulated and unregulated pollutant emissions from diesel engines
No full textTwo Euro 3 commercial trucks fuelled with a 30% v/v biodiesel/diesel fuel blend (B30) and pure diesel fuel
were tested in laboratory under the standard driving conditions (UDC and EUDC driving cycles) and the
CADC ‘‘URBAN’’ test cycle, in order to evaluate the fuel consumption, regulated (CO, HC, NOx, PM) and
unregulated emissions (aldehydes and polycyclic aromatic hydrocarbons).
After substitution of diesel fuel with B30 the following results were observed.
The fuel economy increased proportionally to the deficit of the fuel heating value; so the average efficiency
of the engine can be considered almost unchanged.
In partial disagreement with the literature data, CO and HC emissions showed a slight increase,
whereas NOx emissions did not vary. It must be noted that these variations did not pass the statistical
significance test.
On the contrary, PM, soot fraction and particle number showed a significant reduction; furthermore,
nearly 90% of the emitted particles had an aerodynamic diameter less than 0.1 lm.
The formaldehyde emission markedly increased for both vehicles, whereas acetaldehyde emissions
showed ambiguous trends. Since the remaining aldehydes were under the instrumental detection limit,
the ozone formation potential analysis with B30 showed a raise almost proportional to the formaldehyde
emission increase.
Moreover the lightest and most abundant PAHs species (3–4 benzene rings) showed high increases
even if to different extent for the two vehicles. The species with 4–5 rings (such as benzo(a)pyrene)
showed a net reduction, often under the instrumental limit. Finally, the carcinogenic risk evaluation of
PAHs exhibited a clear toxicity reduction, specially in the cold start cycle, when the catalytic converter’s
efficiency was not fully reached
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