33,547 research outputs found
Principi e tecniche in chirurgia endovascolare: endoprotesi
No full textChirurgia vascolare : patologia, diagnosi e trattamento delle malattie vascolari di interesse chirurgico / Società italiana di chirurgia vascolare ed endovascolare, a cura di F. Benedetti-Valentini ; comitato di redazione: A. Argenteri ... \et al.! ; collaborazione redazionale: B. Gossetti
Torino : Minerva medica, 2001
[opac SBN] [Testo a stampa] [Monografia] [IT\ICCU\PUV\0715616
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Testing and Configuring COTS Devices for CCAM Service Validation in Dual-Use Commercial Vehicles
No full text
Tree rings stable C isotopes as indicators of climatic change in the Mediterranean basin.
No full textEffect of different pruning methods on growth, yield and quality of the Hazelnut cultivar “Tonda Gentile Romana"
No full textIn Central Italy (Latium region) the pruning of hazelnut is done during the winter when trees are dormant, and it is limited to little interventions of cleaning of the canopy and removal of old branches and suckers. In order to study the effect of different pruning methods on cv. “Tonda Gentile Romana”, two thesis, respectively based on low (thesis A) and high (thesis B) intensity pruning, were carried out and compared whit an un-pruned thesis from 2004 to 2006. Wood removed, vegetative growth, light infiltration at the base of the plots, yield and nut traits, defects and kernel quality were measured, in order to quantify plant response to different intensity of pruning in a medium-vigour cultivar. The results indicate good productivity and vegetative growth in the thesis B at the end of the three years, and yield per hectare slightly decreased only in the first year with respect to thesis A. Light infiltration at the base of the plants was low in un-pruned plots, whereas thesis B was characterized by better light penetration. The intensity of pruning had only a slight effect on nut traits and content and profile of oil, sugars and organic acids
A mechanical and clinical evaluation of the Helix Wire for subcapital humerus fracture ostheosynthesis
No full textThe aim of this paper is the investigation of the mechanical properties the Helix Wire, a device that
has been employed for subcapital humerus fracture ostheosynthesis in recent years. There are
several potential clinical advantages associated with its use, but clinical results reported in literature
are controversial.
The Helix Wire has been assimilated to a helical spring, and several analytical solutions for
displacements and stresses have been compared and experimentally validated, showing the
importance of the pitch angle contribution.
Based on the results, the main factor for the clinical indication of this fixation device was found to
be the patient age. In fact, the use of the Helix Wire should be avoided in case of young patients or
of patients with well-developed muscular masses, where the forces may easily lead to critical
stresses in the spring and separation of the fracture surfaces. The clinical results obtained on 30
elderly patients confirmed these findings
Integrating faults and past earthquakes into a probabilistic seismic hazard model for peninsular Italy
No full textItaly is one of the most seismically active countries in Europe. Moderate to strong earthquakes, with magnitudes of up to ∼ 7, have been historically recorded for many active faults. Currently, probabilistic seismic hazard assessments in Italy are mainly based on area source models, in which seis- micity is modelled using a number of seismotectonic zones and the occurrence of earthquakes is assumed uniform. How- ever, in the past decade, efforts have increasingly been di- rected towards using fault sources in seismic hazard models to obtain more detailed and potentially more realistic patterns of ground motion. In our model, we used two categories of earthquake sources. The first involves active faults, and us- ing geological slip rates to quantify the seismic activity rate. We produced an inventory of all fault sources with details of their geometric, kinematic, and energetic properties. The associated parameters were used to compute the total seis- mic moment rate of each fault. We evaluated the magnitude– frequency distribution (MFD) of each fault source using two models: a characteristic Gaussian model centred at the max- imum magnitude and a truncated Gutenberg–Richter model. The second earthquake source category involves grid-point seismicity, with a fixed-radius smoothed approach and a his- torical catalogue were used to evaluate seismic activity. Un- der the assumption that deformation is concentrated along faults, we combined the MFD derived from the geometry and slip rates of active faults with the MFD from the spatially smoothed earthquake sources and assumed that the smoothed seismic activity in the vicinity of an active fault gradually de- creases by a fault-size-driven factor. Additionally, we com- puted horizontal peak ground acceleration (PGA) maps for return periods of 475 and 2475 years. Although the ranges and gross spatial distributions of the expected accelerations obtained here are comparable to those obtained through methods involving seismic catalogues and classical zonation models, the spatial pattern of the hazard maps obtained with our model is far more detailed. Our model is characterized by areas that are more hazardous and that correspond to mapped active faults, while previous models yield expected acceler- ations that are almost uniformly distributed across large re- gions. In addition, we conducted sensitivity tests to deter- mine the impact on the hazard results of the earthquake rates derived from two MFD models for faults and to determine the relative contributions of faults versus distributed seismic activity. We believe that our model represents advancements in terms of the input data (quantity and quality) and method- ology used in the field of fault-based regional seismic hazard modelling in Italy
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
- …
