“Mura della Bastia” – Onigo di Pederobba (Treviso). Ricerche archeologiche, rilievo 3D laser scanning e anastilosi virtuale in un castello medievale del pedemonte trevigiano

The paper presents the results of the ongoing research coordinated by the Chair of Ancient Topography at the University of Padova. The work concerns the medieval site of “Mura della Bastia” in Onigo di Pederobba (Treviso), in the North-Eastern part of Italy. Historical information from written documents and results obtained from the archaeological investigation at the Onigo castle (1994-2007) are discussed. The study provided the historical reconstruction of recent collapses of the Onigo tower and allowed the virtual reconstruction of still-cohesive blocks, which had fallen down in 1989, and which were recovered during the summer of 2007. At this time, five of the ten building blocks have been positioned; the procedure was carried out by comparing the panoply of each agglomerate with the prospect of the tower, which was obtained from the photogrammetric rectification of the historical images (2D). The 3D survey of the tower and of nine blocks was performed with a Leica HDS 2500 laser scanner. The resulting point clouds were aligned with Cyclone software, also using the coordinates of some laser scanning targets, which were measured with the Leica TC 2003 total station in a local reference system. The final 3D model obtained by the co-registration of the scans was textured with the digital images acquired with a Canon EOS 1 ds Mark II camera. Subsequently, three of the five recognized blocks were positioned on the 3D model using Reconstructor software

Electrochemical integration of graphene with light absorbing copper-based thin films

We present an electrochemical route for the integration of graphene with light sensitive copper-based alloys used in optoelectronic applications. Graphene grown using chemical vapor deposition (CVD) transferred to glass is found to be a robust substrate on which photoconductive Cu_{x}S films of 1-2 um thickness can be deposited. The effect of growth parameters on the morphology and photoconductivity of Cu_{x}S films is presented. Current-voltage characterization and photoconductivity decay experiments are performed with graphene as one contact and silver epoxy as the other

Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum