Papers by A. Di Bartolomeo
Programmable Delay Lines (PDLs) are widely used in trigger systems. We performed tests under radi... more Programmable Delay Lines (PDLs) are widely used in trigger systems. We performed tests under radiation and magnetic field for the chip 3D3418-0.25, to be used in the ALICE-TOF trigger system. The tests showed that this chip can comfortably operate in a 0.6 T magnetic field and tolerate a dose larger than 446 Gy.
Physics Letters B, 1998
This paper is dedicated to the memory of Yasushi Ishii, a bright colleague and a good friend, who... more This paper is dedicated to the memory of Yasushi Ishii, a bright colleague and a good friend, whose loss has caused us great sorrow Abstract Part of the neutrino events collected in 1994-1995 by the CHORUS experiment has been analysed. A search was performed for 2 3 charged current interactions followed by the
Journal of Physics G: Nuclear and Particle Physics, 2004
ALICE is a general-purpose heavy-ion experiment designed to study the physics of strongly interac... more ALICE is a general-purpose heavy-ion experiment designed to study the physics of strongly interacting matter and the quark-gluon plasma in nucleus-nucleus collisions at the LHC. It currently includes more than 900 physicists and senior engineers, from both nuclear and high-energy physics, from about 80 institutions in 28 countries.
The European Physical Journal C, 2006
The φ → K + K − decay channel in Pb-Pb collisions at LHC is studied through a full simulation of ... more The φ → K + K − decay channel in Pb-Pb collisions at LHC is studied through a full simulation of the ALICE detector. The study focuses on possible signatures in this channel of quark-gluon plasma (QGP) formation. On a basis of 10 6 collisions at high centrality some proposed QGP signatures are clearly visible both in K + K − invariant mass and transverse mass distributions. The high significance of this observation appears to reside heavily on the use of the TOF (Time Of Flight) system of ALICE in addition to its central tracking detectors.
Carbon, 2011
The effect of the functionalization of multi-wall carbon nanotubes (MWCNTs) on the structure, the... more The effect of the functionalization of multi-wall carbon nanotubes (MWCNTs) on the structure, the mechanical and electrical properties of composites was investigated. Samples based on epoxy resin with different weight percentage of MWCNTs or COOH-functionalized carbon nanotubes (MWCNT-COOH) were prepared and characterized. Dynamicmechanical thermal analysis shows that the storage modulus increases with the addition of MWCNTs, whereas a constant value or even a weak reduction was observed for functionalized nanotubes. Two phases were suggested in the composites with MWCNT-COOH, both by dynamic-mechanical properties and by water transport. Chemical functionalization of MWCNTs increases the compatibility with the epoxy matrix due to the formation of an interface with stronger interconnections. This, in turn, causes a significant decrease in the electrical conductivity of this type of composite with respect to the untreated MWCNTs which can be explained in terms of tunnelling resistance between interacting nanotubes.
Journal of Physics D: Applied Physics, 2009
ABSTRACT The electrical properties of polypropylene isomers were correlated with the morphology a... more ABSTRACT The electrical properties of polypropylene isomers were correlated with the morphology and chain conformation of differently obtained isotactic (iPP) and syndiotactic (sPP) samples. In the case of iPP, a crystallized and a smectic sample were prepared, whereas for sPP two crystalline helical samples and a mesophase with the chains in trans-planar conformation were considered. The phase composition was obtained for all the samples comparing x-ray diffractograms and transport properties of vapours, which give the crystallinity and the amorphous fraction, respectively. The fraction of mesophase was obtained by the difference of the previous values. The study of the morphology evidenced similarities and differences among the samples, which were discussed and correlated with the phase composition. The electrical conductivity was measured for all the samples, and the syndiotactic isomer showed the lowest value as well as a dependence on the structure. In contrast, the isotactic isomer showed the same behaviour for either polymorph. Based on the structural and electrical results, a phenomenological explanation of the conduction mechanisms taking place in the different forms has been proposed. In particular, the current in the iPP seems to be controlled by Schottky emission, i.e. by field-assisted thermo-ionic injection of carriers from the electrode into the polymer, whereas for the sPP more than one mechanism is likely to be effective, although the ionic transport appears as the predominant one. The experimental data confirm a different behaviour of the ionic conduction properties for the different polymorphs, highlighting the greater insulating characteristics of the mesomorphic structure of the syndiotactic isomer.
Uploads
Papers by A. Di Bartolomeo