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Now showing items 113 - 128 of 130

  • PARTE PRIMA: GIURISPRUDENZA CIVILE || Sezioni unite civili; sentenza 12 marzo 1951, n. 596; Pres. Pellegrini P., Est. Di Macco, P. M. De Martini (concl. conf.); P. M. presso il Tribunale di Verbania e A. Cane (Avv. Iemolo, Candian) c. G. M. Cane (Avv. Borda, Carnelutti, Malchiodi, Allegra, Fuhrmann)

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  • PARTE PRIMA: GIURISPRUDENZA CIVILE || Sezioni unite civili; sentenza 12 marzo 1951, n. 596; Pres. Pellegrini P., Est. Di Macco, P. M. De Martini (concl. conf.); P. M. presso il Tribunale di Verbania e A. Cane (Avv. Iemolo, Candian) c. G. M. Cane (Avv. Borda, Carnelutti, Malchiodi, Allegra, Fuhrmann)

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  • FEM analysis of pressuremeter tests in calibration chamber using a hyperbolic constitutive model for sands : Di Bacco, R; Ghionna, V N; Mazza, G; Pellegrini, R Proc Ninth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Bangkok, 9–13 December 1991V1, P15–18. Publ Thailand: Southeast Asian Geotechnical Society, 1991

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  • Fabrication and nuclear reactor tests of ultra-thin 3D silicon neutron detectors with a boron carbide converter (vol 9, P04010, 2014)

    Fleta, C.   Guardiola, C.   Esteban, S.   Jumilla, C.   Pellegrini, G.   Quirion, D.   Rodriguez, J.   Lousa, A.   Martinez-de-Olcoz, L.   Lozano, M.  

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  • Synchrotron tests of 3D Medipix2 and TimePix X-Ray Detectors RID G-1279-2010

    Mac Raighne, Aaron   Akiba, K. C.   Alianelli, L.   Artuso, M.   Bates, R.   Bayer, F.   Buytaert, J.   Collins, P.   Crossley, M.   Eklund, L.   Fleta, C.   Gallas, A.   Gandelman, M.   Gersabeck, M.   Gimenez, E. N.   Gligorov, V.   Huse, T.   John, M.   Llin, L. F.   Lozano, M.   Maneuski, D.   Marchal, J.   Michel, T.   Nicol, M.   Pellegrini, G.   Perira, D. E.   Plackett, R.   O'Shea, V.   Parkes, C.   Rodrigues, E.   Sawhney, K. J. S.   Tartoni, N.   Vazquez, P.  

    In this article we report on the use micro-focus synchrotron X-ray radiation and pion beams to compare the detection efficiencies and charge sharing properties of novel 3D detectors to that of the current planar technology. Detector substrates are bump-bonded to the Medipx2 and Timepix chips. 55 mu m square pixel maps of the detection efficiencies have been produced using X-ray and MIP beams. For X-rays, a drop of 3-4% detection efficiency over the pixel area was found due to the central electrode. The corner electrodes show no degradation in efficiency compared to that of the planar device. For MIPs a drop of 0.5% in efficiency due to the central electrode was observed. Evidence of a considerable reduction in charge sharing in the 3D detectors compared to the planar devices is also shown.
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  • Charge sharing measurements of pixilated CdTe using Medipix-II chip

    Chmeissani, M.   Maiorino, M.   Blanchot, G.   Pellegrini, G.   Garcia, J.   Lozano, M.   Martinez, R.   Puigdengoles, C.   Mullan, M.  

    One important consideration of the design and the operation of pixilated detector is the ratio of the pixel size to the thickness of the detector. When the e-h pairs are generated and the charge drifts toward the pixel electrodes under the influence of the bias field, the charge spread is directly related to the drift time, which strongly depends on the carrier mobility and distance travelled by the carriers. This study has general impact on the design of pixilated detector; however its impact on the design and the operation of pixilated detector coupled to photon counting electronics is more profound. The results imply that designing a Cd(Zn)Te detector with very small pixel size, say 25mum and a detector 1 mm thick, is unrealistic because in reality such intrinsic fine spatial resolution can not be attained in the corresponding image due to charge sharing
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  • Quantifying the measurement uncertainty using Bayesian inference

    Zanobini, A.   Ciani, L.   Pellegrini, G.  

    In this paper we describe the use of Bayesian inference for the evaluation of measurement uncertainty. The performance of the proposed approach is tested in a multivariate non linear measurement model in which the measurand is the ratio between two quantities: the first one being the sum of constant systematic effects and experimental indications, while the second one is referred to a measurement standard By assuming that the information about the input quantities are in form of prior joint probability density functions and a series of direct measurement data are available by experiment, the Bayes' theorem is applied to evaluate the posterior expectation (estimate), the posterior standard uncertainty and the posterior coverage probability concerning the measurand Numerical results are reported to asses the validity of the proposed analysis.
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  • PARTE SECONDA: GIURISPRUDENZA PENALE || Udienza 1° febbraio 1876, Pres. Pellegrini, ff. P. M. Malagoli S. P. G. — App. A. Guidotti (avv. Sala)

    C. Palomba  

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  • Gamma radiation effects on different varieties of SiGe : C HBT technologies RID C-3445-2011 RID F-4921-2011

    Ullan, M.   Diez, S.   Campabadal, F.   Lozano, M.   Pellegrini, G.   Knoll, D.   Heinemann, B.  

    We have studied the ionization damage produced by gamma irradiation on transistors from three different varieties of SiGe:C HBT technologies from Innovation for High Performance Microelectronics (HIP), Germany. The results show strong gain degradations at the highest doses, with an indication of damage saturation. We did not observe strong differences in radiation tolerance among the three different technologies. These studies are in the framework of the radiation assurance tests of SiGe BiCMOS technologies for their possible application in the front-end readout electronics of the detector modules of the future ATLAS upgrade for the Super-LHC, but space-oriented applications are also considered. A comparison is presented with previous gamma irradiations of different SiGe technologies in the literature.
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  • Dear-Mama: A photon counting X-ray imaging project for medical applications RID C-3445-2011 RID F-4921-2011

    Blanchot, G.   Chmeissani, M.   Diaz, A.   Diaz, F.   Fernandez, J.   Garcia, E.   Garcia, J.   Kainberger, F.   Lozano, M.   Maiorina, M.   Martinez, R.   Montagne, J. P.   Moreno, I.   Pellegrini, G.   Puigdengoles, C.   Sentis, M.   Teres, L.   Tortajada, M.   Ullan, M.  

    Dear-Mama (Detection of Early Markers in Mammography) is an EU funded project devoted to develop an X-ray Medical imaging device based on room temperature solid-state pixel detector coupled to photon counting readout electronics via bump bonding. The technology being used leads to signal-to-noise ratio enhancement and thus the ability to detect low contrast anomalies such as microcalcifications. The Dear-Mama machine is currently being evaluated and preliminary results show an excellent MTF response. Dear-Mama consortium is made up from six European institutions, the project runs from December 2001 to March 2006. (c) 2006 Elsevier B.V. All rights reserved.
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  • Cowper's gland duct cyst in an adult male

    Selli, C.   Nesi, G.   Pellegrini, G.   Bartoletti, R.   Travaglini, F.   Rizzo, M.  

    A 48-year-old man presenting with perineal pain, weak stream and dysuria was found to have a Cowper's gland duct cyst measuring 1.8 times 3.5 cm, which was investigated with retrograde and voiding urethrography, cavernosography and perineal MRI, which was the single most useful imaging technique. Treatment consisted in complete surgical excision, which allowed an anatomical reconstruction of the urethra. This condition is typical of the pediatric age group, and seldom diagnosed in adults.
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  • Quantifying the Measurement Uncertainty Using Bayesian Inference

    Zanobini, A.   Ciani, L.   Pellegrini, G.  

    In this paper we describe the use of Bayesian inference for the evaluation of measurement uncertainty. The performance of the proposed approach is tested in a multivariate non linear measurement model in which the measurand is the ratio between two quantities: the first one being the sum of constant systematic effects and experimental indications; while the second one is referred to a measurement standard By assuming that the information about the input quantities are in form of prior joint probability density functions and a series of direct measurement data are available by experiment; the Bayes' theorem is applied to evaluate the posterior expectation (estimate); the posterior standard uncertainty and the posterior coverage probability concerning the measurand. Numerical results are reported to asses the validity of the proposed analysis.
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  • Evaluation of surface passivation layers for bulk lifetime estimation of high resistivity silicon for radiation detectors

    Rafi, J. M.   Cardona-Safont, L.   Zabala, M.   Carnpabadal, F.   Pellegrini, G.   Lozano, M.  

    With the aim to identify an appropriate low-temperature surface passivation process that could be used for bulk lifetime estimation of high resistivity (HR) (> 1k Omega center dot cm) silicon for radiation detectors, different candidate passivating layers were evaluated on n-type and p-type standard Czochralski (CZ), HR magnetic Czochralski (MCZ) and HR float zone (FZ) substrates. Minority carrier lifetime measurements were performed by means of a microwave PhotoConductance Decay single point setup. The results show that SiNx PECVD layers deposited at 200 degrees C may be used to evaluate the impact of different processing steps and treatments on the substrate characteristics for radiation detectors.
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  • Neutron Detection with Silicon Devices

    Pellegrini, G.   Lozano, M.   Guardiola, C.  

    Most neutron detectors use some type of conversion material to convert the incident neutron into secondary charged particles; which can then be detected inside the detector bulk afterward. In this way; semiconductor detectors incorporating neutron reactive material on top of a diode substrate can be used as a neutron detector. These reactions emit charged particles and recoil nucleus with energies high enough to be distinguished from the gamma ray background. Based in the experience in microfabricated radiation detectors; CNM-IMB (national center of microelectronic at Barcelona; Spain) has started a new research line in solid state neutron detectors for imaging or dissymmetry. Geant4 Monte-Carlo simulation package was used to forecast the detection efficiency of planar structures. The simulated detectors were covered with a layer of Boron; therefore; a simple silicon neutron detector is a combination of a planar diode covered with a neutron converter layer. At the same time; initial experimental measurements of silicon pad detectors covered with neutron converts are been carried out in the autonomous University of Barcelona with a neutron source (241 Am-Be) with interesting results.
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  • PARTE SECONDA: GIURISPRUDENZA PENALE || Udienza 1° febbraio 1876, Pres. Pellegrini, ff. P. M. Malagoli S. P. G. — App. A. Guidotti (avv. Sala)

    C. Palomba  

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  • Performance Limits of a 55-$mu$m Pixel CdTe Detector

    Pellegrini, G.   Chmeissani, M.   Maiorino, M.   Blanchot, G.   Garcia, J.   Lozano, M.   Martinez, R.   Puigdengoles, C.   Ullan, M.   Casado, P.  

    In this work, the results from simulation of a CdTe pixel detector with a pixel size of 45$mu$m and a pitch of 55$mu$m are presented. Simulation of charge sharing between neighboring pixels has been compared with experimental results obtained by the use of the Medipix2 photon counting chip by means of a unique read-out system developed for the Dear-Mama project. Electrical simulations have been performed using the commercial software package DESSIS (ISETCAD) and combined with the Monte Carlo code GEANT4 to simulate the process of interaction and subsequent charge transport of charges induced by radiation. This allowed the analysis of charge sharing between pixel elements, an important limiting factor in imaging applications. Simulation was compared with experimental results obtained by means of a 1 mm thick CdTe detector. Each of these pixel electrodes was connected to the corresponding readout pixel on the Medipix2 chip, via an indium bump-bond. The backside contact was biased at$-100$V, so that the pixel electrodes were collecting electrons. The results obtained imply that using a detector 1 mm thick with a pixel size smaller than 55$mu$m in single photon counting mode is unrealistic, because such fine spatial resolution cannot be attained in the corresponding image due to charge sharing.
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