2,505 research outputs found
"Peter Mair, dalla periferia dell’Europa al centro della Scienza Politica”, in Solano G. e Sozzi F. (a cura di) “I maestri delle scienze sociali”, VOL.2, Limina Mentis, Milano.
No full textQuello smisurato spiritual gigante: il “San Carlone” di Arona e l’aspetto quantitativo nel culto di San Carlo Borromeo
No full textOn the effect of deep defects on the Voc deficit in high-GGI CIGS absorbers: A numerical study
No full textUsing numerical simulations, we investigate the effect of a deep donor known to exist at EV + 1.33 eV, as a contribution to explain the large VOC deficit of Ga-rich absorbers.. We find that uniform GGI absorbers with GGI > 0.5 suffer for the presence of this deep donor, with the VOC deficit linearly increasing with GGI. On the other hand, simulations indicate that this deep donor is unlikely to be a significant performance limiter in double-graded cells
Simulation of the effect of grain-boundaries in backside-passivated CIGS solar cells
No full textWe carry out numerical 3D simulations of CIGS cells with back-side Al2O3 passivation and point contact openings in the presence of grain boundaries in the absorber. We consider CIGS cells with different absorber thickness, from 0.35 to 3 mu mathrm{m}. For thinner absorbers (1 mu mathrm{m} or less) we observe that GBs terminating on the Al2O3 are completely or almost completely passivated, while the effectiveness of the passivation decreases for thicker absorbers. GBs terminating on the point contact, instead, significantly lower the efficiency, regardless of absorber thickness. The presence of grain boundaries and the dimension of grains should therefore be taken into consideration when optimizing the back-side point contact array geometry
Color-Performance Dynamics in CIGS Solar Cells with Varied ITO and Zn(O,S) Layer Thickness Explored by Numerical Simulations
No full textThin-film solar cells can be manufactured in various colors, making them more visually appealing for certain applications, such as building facades or public spaces. One method for producing colored thin-film solar cells is to adjust the thickness of the transparent layers in the cell to manipulate optical interference. However, the color of the cell can affect its efficiency. In this study, we utilize electro-optical simulations to determine the cell efficiency of CIGS solar cell at various ITO and Zn(O,S) thicknesses, and evaluate the corresponding color with a dedicated open source software
Recent results on Kaon decays from NA48/2
No full textThe first observation of the K± → π±π0e+e− rare decay by the NA48/2 experiment at CERN SPS is reported, based on ∼ 2 ×1011 K± decays recorded in 2003-2004. From a sample of 4919 candidates with 4.9% background the branching ratio in the full kinematic region is measured to be BR(K± → π±π0e+e−) = (4.24 ±0.14) ×10−6. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on Chiral Perturbation Theory. The CP-violating asymmetry between K+ → π+π0e+e− and K− → π−π0e+e− decay rates has been measured, providing an upper limit |ACP| < 4.82 ×10−2 at 90% CL. The NA48/2 combined measurement of the charged kaon semileptonic form factors, based on 4.4 million K± → π0e±νe and 2.3 million K± → π0μ±νμ events collected in 2004, is presented. This result represents the most precise form factor measurement from a combined Kl±3 analysis
GPUs for fast triggering and pattern matching at the CERN experiment NA62
No full textIn high energy physics experiment the trigger system is crucial to reduce the quantity of data recorded on tape and the acquisition bandwidth requirements. This is particularly true in rare decays experiments. The NA62 experiment aims at measuring the Branching Ratio of K+ → π+ νν- predicted in the Standard Model (SM) at level of -10-10. In this paper we describe the idea to use the commercial video card processor (GPU) to construct a fast and effective trigger system, both in hardware and software level. Due to the use of off the shelf technology, in continuous development for other purposes, the architecture described would be easily exported to other experiments, to build a versatile and fully customizable trigger system. ©2009 IEEE
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