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3. The Ischia Island hydrothermal system: an integrated multidisciplinary (geochemical, geophysical and geological) study

Author

DI NAPOLI, Rossella, MARTORANA, Raffaele, AIUPPA, Alessandro, LUZIO, Dario, VALENZA, Mariano, Orsi, G, Camarda, M, De Gregorio, S, Gagliano Candela, E, Messina, N, Pecoraino, G, Bitetto, M, D'Alessandro, W, de Vita, S, Di Napoli, R, Martorana, R, Orsi, G, Aiuppa, A, Camarda, M, De Gregorio, S, Gagliano Candela, E, Luzio, D, Messina, N, Pecoraino, G, Bitetto, M, D'Alessandro, W, de Vita, S, and Valenza, M

Subjects
hydrothermal system, thermal waters, ischia
Abstract

Ischia Island is the emergent portion of a large volcanic complex on the Gulf of Naples (Southern Italy). Ischia volcano has undertaken a complex evolution since 150 ka b.p., with prolonged cycles of effusive and explosive eruptions alternated with quiescence periods (the most recent of which started after the 1302 A.D. Arso eruption). Currently, hot springs (with discharge temperature up to 90 C), fumarolic gas emissions with CO2 up to 97%, and diffuse soil degassing testify a persistent activity state of the Ischia volcano. Ischia Island is a very good example of an active volcano hosting a large hydrothermal system and, in particular, its south-western sector has long been known to be the most-actively degassing area, characterized by a pervasive hydrothermal circulation. Di Napoli et al. (2009) have recently suggested that thermal manifestations in this sector of the island are fed by a shallow hydrothermal reservoir located at 150–300 m of deep with equilibrium temperatures 150 C. The presence of a relative shallow depth thermal aquifer represent a threat to populations living in the surroundings of volcanoes. Indeed, the supply of volatiles and thermal energy from the deep-seated magmatic reservoirs may prompt pressurization of hydrothermal aquifer, increasing the probability of phreatic explosions Here, we report the results an integrated multidisciplinary (geological, geochemical and geophysical) investigation aimed at a comprehensive characterisation of the hydrothermal setting in the south-western sector of Ischia. Geological investigations, hydrogeochemical determinations (with a focus on dissolved gases) and soil diffuse CO2 fluxes surveys, and electrical resistivity tomography and TEM soundings, have simultaneously been carried out and interpreted, with the ultimate objective of building up a model of fluid circulation in the shallowest (< 0.5 km) part of the hydrothermal system. Results show that fluids circulation, in the investigated area, is governed by a very complex structural setting schematised in three main sectors: extra caldera, caldera floor, and resurgent caldera. In particular, the caldera floor sector is the portion of the study area to which gas-rich fluids can be transferred from underlying deeper and hotter hydrothermal reservoirs. Indeed, the aquifer geometry, and the dense network of faults and fractures, force hot and gas-rich fluids to preferentially flow towards (and thus accumulate within) this sector of the volcano. Our model of fluid circulation may serve as a basis for interpreting changes in the hydrothermal regime associated with any future unrest that could potentially escalate towards an eruption in this densely populated island

Published
2011

4. The structure of a hydrothermal system from an integrated geochemical, geophysical and geological approach: the Ischia Island case study

Author

DI NAPOLI, Rossella, MARTORANA, Raffaele, AIUPPA, Alessandro, LUZIO, Dario, VALENZA, Mariano, Orsi, G, Camarda, M, De Gregorio, S, Gagliano Candela, E, Messina, N, Pecoraino, G, Bitetto, M, de Vita, S, Di Napoli, R, Martorana, R, Orsi, G, Aiuppa, A, Camarda, M, De Gregorio, S, Gagliano Candela, E, Luzio, D, Messina, N, Pecoraino, G, Bitetto, M, de Vita, S, and Valenza, M

Subjects
fluid geochemistry, hydrothermal system, Settore GEO/11 - Geofisica Applicata, TEM, resurgent caldera, ERT, Ischia, Settore GEO/08 - Geochimica E Vulcanologia
Abstract

The complexity of volcano-hosted hydrothermal systems is such that thorough characterisation requires extensive and interdisciplinary work. We use here an integrated multidisciplinary approach, combining geological investigations with hydrogeochemical and soil degassing prospecting, and resistivity surveys, to provide a comprehensive characterisation of the shallow structure of the south-western Ischia’s hydrothermal system. We show that the investigated area is characterised by a structural setting that, although very complex, can be schematised in three sectors, namely the extra caldera sector (ECS), caldera floor sector (CFS), and resurgent caldera sector (RCS). This contrasted structural setting governs fluid circulation. Geochemical prospecting shows, in fact, that the caldera floor sector, a structural and topographic low, is the area where CO2-rich (>40 cm3/l) hydrothermally mature (log Mg/Na ratios 150 g∙m-2∙day-1), is clearly captured by electrical resistivity tomography (ERT) and transient electromagnetic (TEM) surveys as an highly conductive (resistivity 10,000 mg/l) and poorly conductive meteoric-derived (TDS

Published
2011

5. Hydrothermal circulation on Ischia Island (Southern Italy), revealed by an integrated geochemical, geophysical and geological approach

Author

DI NAPOLI, Rossella, AIUPPA, Alessandro, MARTORANA, Raffaele, LUZIO, Dario, VALENZA, Mariano, Orsi, G, Camarda, M, De Gregorio, S, Gagliano Candela, E, Messina, N, Pecoraino, G, de Vita, S, Di Napoli, R, Aiuppa, A, Martorana, R, Orsi, G, Camarda, M, De Gregorio, S, Gagliano Candela, E, Luzio, D, Messina, N, Pecoraino, G, de Vita, S, and Valenza, M

Subjects
fluid geochemistry, hydrothermal system, resurgent caldera, TEM, ERT, Ischia, Settore GEO/08 - Geochimica E Vulcanologia
Abstract

Volcano-hosted hydrothermal systems are complex geological objects, whose thorough characterisation requires extensive and interdisciplinary work. Indeed, even thought geological, geochemical and geophysical observations offer highly significant but independent information, only an integrated multidisciplinary approach can yield a comprehensive characterisation of the chemical/physical structure of hydrothermal systems. Notwithstanding the extensive application of geological, geochemical and geophysical techniques in geothermal research, there are only a few examples in the literature of concurrent use of the three techniques [Finizola et al., 2002; Zlotnicki et al., 2009]; these studies overall demonstrate that only an integrated multidisciplinary approach can yield a comprehensive characterisation of the chemical/physical structure of hydrothermal systems. Ischia Island, in Southern Italy, is an active resurgent caldera [Orsi et al., 1991] that has produced intense volcanism over the past 10 ka, with the last eruption in 1302 A.D. The island is a very good example of an active volcano hosting a large hydrothermal system [Penta and Conforto, 1951]. In particular, its south western sector has long been known for pervasive hydrothermal circulation, as part of the larger hydrothermal system. Thus, this sector of the island is an ideal test site for multidisciplinary geothermal prospecting, since the complex geological and structural setting, the peculiar hydrothermal conditions favouring the formation of remarkably different water types in a relatively small area (̴ 20 km2) [Di Napoli et al., 2009], and the poorly-known but highly contrasted resistivity structure, all contribute to make interpretation of hydrothermal processes challenging. Here, we present the results of a multidisciplinary research performed in the south-western sector of Ischia Island by using geological, geochemical (groundwater composition and soil diffuse CO2 fluxes) and geophysical (Electrical Resistivity Tomography – ERT - and Transient Electromagnetic Method – TEM - soundings) methods. The acquired data are discussed in order to build up a hypothesis for fluid circulation in the shallowest (< 0.5 km) part of the hydrothermal system. The combined investigations highlight that the deep hydrothermal fluid circulation is strongly dependent on the structural setting of the SW Ischia sector, composed by three distinct sectors: Extra Caldera Sector (ECS), Caldera Floor sector (CFS), and Resurgent Caldera Sector (RCS) (Figure 1a). This peculiar tectonic/structural setting of the SW portion of Ischia Island force infiltrating waters to flow and accumulate into the structural and topographic low of the Caldera Floor Sector (CFS in Figure 1a), in which the shallow thermal aquifer has been identified by resistivity measurements at 100-200 m of depth. This aquifer, hosted into the Mt. Epomeo Green Tuff (MEGT) deposits, is characterized by very low resistivity values (< 1 Ω•m), and has a mixed marine-meteoric derivation. Seawater mostly infiltrates in the SW portion of the area (close to A in Figure 1a), whilst a prevalent contribution from cold diluted waters is evidenced in the NE portion of the study area (close to A’ in Figure 1a), along the flanks of Mt. Epomeo relief. Geochemical investigations have evidenced that meteoric (Total Dissolved Solid content ~ 1.5 g/l and δ18O ~ -7‰) and marine (Total Dissolved Solid content ~ 33 g/l and δ18O ~ 0‰) waters accumulate into the aquifer hosted in the CFS and form mixed solutions. However, the collected groundwaters only partially overlap the meteoric-sea water mixing trend, claiming for the existence of additional processes. A number of samples are characterized by Mg poor (Mg down to the detection limit) and CO2-rich (up to 229 cm3/l at STP) compositions, which are indicative for a deep derivation of these fluids. Indeed, Mg-depletion is a typical features of waters produced in hydrothermal environments [Giggenbach, 1988], as a results of extended water-gas-rock interactions at high temperature, during which Mg was removed from the solution by precipitation of secondary mineral phases. As represented in the interpretative model of Figure 1, the intense network of faults and fractures in the Caldera Floor Sector, represents the preferential pathway for the ascent of both thermal waters and deep gases as CO2, which is also extensively degassed from soil. Finally, the pervasive hydrothermal circulation determine presence of numerous surface thermal manifestations in this sector of Ischia Island. References Di Napoli, R., Aiuppa, A., Bellomo, S., Brusca, L., D'Alessandro, W., Gagliano Candela, E., Longo, M., Pecoraino, G. and Valenza, M., (2009). A model for Ischia hydrothermal system: Evidences from the chemistry of thermal groundwaters. Journal of Volcanology and Geothermal Research, 86, 133-159. Finizola, A., Sortino, F., Lénat, J.F. and Valenza, M., (2002). Fluid circulation at Stromboli volcano (Aeolian Islands, Italy) from self-potential and CO2 surveys. Journal of Volcanology and Geothermal Research, 116, 1-18. Giggenbach, W.F., (1988). Geothermal solute equilibria. Derivation of Na–K–Mg–Ca geoindicators. Geochimica Cosmochimica Acta, 52, 2749-2765. Orsi, G., Gallo, G. and Zanchi, A., (1991). Simple shearing block-resurgence in caldera depressions. A model from Pantelleria and Ischia. Journal of Volcanology and Geothermal Research, 47, 1-11. Penta, F. and Conforto, B., (1951). Risultati di sondaggi e di ricerche geominerarie nell'isola d'Ischia dal 1939 al 1943, nel campo del vapore, delle acque termali e delle 'forze endogene' in generale. Annals of Geophysics, 4, 159-191. Zlotnicki, J., Sasai, Y., Toutain, J.P., Villacorte, E.U., Bernard, A., Sabit, J.P., Gordon Jr, J.M., Corpuz, E.G., Harada, M., Punongbayan, J.T., Hase, H. and Nagao, T., (2009). Combined Electromagnetic, geochemical and thermal surveys of Taal volcano (Philippines) during the period 2005-2006. Bulletin of Volcanology, 71, 29-47.

Published
2011

8. Micro-Raman analysis and finite-element modeling of 3 C-SiC microstructures

Author

Piluso N, Anzalone R, Camarda M, Severino A, La Magna A, D'Arrigo G, and La Via F

Abstract

Micro- and nano-electromechanical systems (MEMS and NEMS) fabricated in 3?C-SiC are receiving particular attention thanks to the material physical properties: its wide band gap (2.3?eV), its ability to operate at high temperatures, its mechanical strength and its inertness to the exposure in corrosive environments. However, high residual stress (which is normally generated during the hetero-epitaxial growth process) makes the use of 3?C-SiC in Si-based MEMS fabrication techniques very limited leading to a failure of micro-machined/sensor structures. In this paper, micro-Raman characterizations and finite-element modeling (FEM) of microstructures realized on poly and single-crystal (100) 3?C-SiC/Si films are performed. Transverse optical (TO) Raman mode analysis reveals the stress relaxation on the free standing structure (796.5?cm-1) respect to the stressed unreleased region (795.7?cm-1). Also, microstructures as cantilever, bridge and planar rotating probe show an intense stress field located around the undercut region. Here, the TO Raman mode undergoes an intense shift, up to 2?cm-1, ascribed to the modification of the Raman stress tensor. Indeed, the generalized axial regime, described by diagonal components of the Raman stress tensor, cannot be applied in this region. Raman maps analysis and FEM simulations show the activation of the shear stress, i.e. non-diagonal components of the stress tensor. The stress-Raman modes shift correlation, in the case of fully non-diagonal stress tensors, has been investigated. The aim of future works will be to minimize the stress field generation and the defects density within the epitaxial layer.

Published
2013
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11. Defect Influence on Heteroepitaxial 3C-SiC Young's Modulus

Author

Anzalone R, Camarda M, Canino A, Piluso N, La Via F, and D'Arrigo G

Abstract

Heteroepitaxial cubic silicon carbide (3C-SiC) is an extremely promising material for micro-and nano-electromechanical systems due to its large Young's modulus. Unfortunately, the heteroepitaxy of 3C-SiC on Si substrate is affected by the high mismatch in the lattice parameters and the thermal expansion coefficients between the two dissimilar materials that generate a high number of defects in the material. In this work, through the measurement of natural resonant frequencies and Raman shift analysis, a strong relationship between the mechanical proprieties of the material (Young's modulus) and the film crystal quality (defect density) was observed.

Published
2011

14. Optical investigation of bulk electron mobility in 3C-SiC films on Si substrates

Author

Piluso N, Severino A, Camarda M, Canino A, La Magna A, and La Via F

Abstract

The dependence between the carrier concentration and electrical mobility has been studied by micro-Raman spectroscopy in n-doped 3C-SiC films grown on (111) and (100) Silicon oriented substrates. Bulk mobility varies between 10 and 510 cm(2) V-1 s(-1) for a carrier concentration ranging between 1.6 X 10(16) and 5.4 X 10(18) cm(-3). Local stacking variations observed on the (111) 3C-SiC surface lead to a worse crystal morphology compared to (100) 3C-SiC films resulting in a decrease in the average bulk mobility. Defects are thus accountable for the dependence between mobility and carrier concentration for different 3C-SiC orientations.

Published
2010

20. Theoretical monte carlo study of the formation and evolution of defects in the homoepitaxial growth of SiC

Author

Camarda M., La Magna A., Fiorenza P., Izzo G., and La Via F.

Subjects
Condensed Matter::Materials Science
Abstract

A novel Monte Carlo kinetic model has been developed and implemented to predict growth rate regimes and defect formation for the homo-epitaxial growth of various SiC polytypes on different substrates. Using this model we have studied the generation of both point like and extended defects in terms of the growth rate and off-cut angle, finding qualitative agreement with both electrical and optical characterization and analytical results. © (2009) Trans Tech Publications.

Published
2009

22. Monte Carlo study of the step flow to island nucleation transition for close packed structures

Author

Camarda M, La Magna A, and La Via F

Abstract

Using joined super-lattice Kinetic Monte Carlo and continuous simulations we study the transition between step flow and two-dimensional island nucleation growth on stepped surfaces for close packed crystalline structures. The numerical analysis is performed in terms of misorientation cut, deposition rate and temperature. We compare the results of the atomistic approach with the predictions of the standard and generalized Burton-Cabrera-Frank (BCF) continuous model. The generalization consists in the explicit inclusion in the theory of the formation and dissolution of mobile dimers on the terraces. We show that the BCF-like continuous theories break down for low temperatures, large off-angle cuts and high deposition rates. In view of these results we critically discuss the basic assumptions of the continuous models.

Published
2009

23. A cross-correlation method to search for gravitational wave bursts with AURIGA and Virgo

Author

Bignotto, M., Bonaldi, M., Camarda, M., Cerdonio, M., Conti, L., Drago, M., Falferi, P., Liguori, N., Longo, S., Mezzena, R., Mion, A., Ortolan, A., Prodi, G. A., Re, V., Salemi, F., Taffarello, L., Vedovato, G., Vinante, A., Vitale, S., Zendri, J. P., Acernese, F., Alshourbagy, M., Amico, P., Antonucci, F., Aoudia, S., Astone, P., Avino, S., Baggio, L., Ballardin, G., Barone, F., Barsotti, L., Barsuglia, M., Bauer, T. S., Bigotta, S., Birindelli, S., Boccara, C., Bondu, F., Bosi, L., Braccini, S., Bradaschia, C., Brillet, A., Brisson, V., Buskulic, D., Cagnoli, G., Calloni, E., Campagna, E., Carbognani, F., Cavalier, F., Cavalieri, R., Cella, G., Cesarini, E., Chassande Mottin, E., Clapson, A., Cleva, F., Coccia, E., Corda, C., Corsi, A., Cottone, F., Coulon, J., Cuoco, E., D'Antonio, S., Dari, A., Dattilo, V., Davier, M., Rosa, R. D., Prete, M. D., Fiore, L. D., Lieto, A. D., Paolo, M. D., Virgilio, A. D., Evans, M., Fafone, V., Ferrante, I., Fidecaro, F., Fiori, I., Flaminio, R., Fournier, J., Frasca, S., Frasconi, F., Gammaitoni, L., Garufi, F., Genin, E., Gennai, A., Giazotto, A., Giordano, L., Granata, V., Greverie, C., Grosjean, D., Guidi, G., Hamdani, S., Hebri, S., Heitmann, H., Hello, P., Huet, D., Kreckelbergh, S., Penna, P. L., Laval, M., Leroy, N., Letendre, N., Lopez, B., Lorenzini, M., Loriette, V., Losurdo, G., Mackowski, J., Majorana, E., Man, C. N., Mantovani, M., Marchesoni, Fabio, Marion, F., Marque, J., Martelli, F., Masserot, A., Menzinger, F., Milano, L., Minenkov, Y., Moins, C., Moreau, J., Morgado, N., Mosca, S., Mours, B., Neri, I., Nocera, F., Pagliaroli, G., Palomba, C., Paoletti, F., Pardi, S., Pasqualetti, A., Passaquieti, R., Passuello, D., Piergiovanni, F., Pinard, L., Poggiani, R., Punturo, M., Puppo, P., Rapagnani, P., Regimbau, T., Remillieux, A., Ricci, F., Ricciardi, I., Rocchi, A., Rolland, L., Romano, R., Ruggi, P., Russo, G., Solimeno, S., Spallicci, A., Swinkels, B. L., Tarallo, M., Terenzi, R., Toncelli, A., Tonelli, M., Tournefier, E., Travasso, F., Vajente, G., J. F. J., Der, S. v., Verkindt, D., Vetrano, F., Vicere, A., Vinet, J., Vocca, H., Yvert, M., Collaboration, A., Collaboration, V., Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), APC - Cosmologie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), ESPCI ParisTech, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), APC - Gravitation (APC-Gravitation), AstroParticule et Cosmologie (APC (UMR_7164)), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Laboratoire des matériaux avancés (LMA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Virgo, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AURIGA, VIRGO, Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), Laboratoire d'Annecy de Physique des Particules (LAPP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), (Astro)-Particles Physics, Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux ( ARTEMIS ), Université Nice Sophia Antipolis ( UNS ), Université Côte d'Azur ( UCA ) -Université Côte d'Azur ( UCA ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Physique Corpusculaire et Cosmologie - Collège de France ( PCC ), Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ) -Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ) -AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Observatoire de Paris-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Laboratoire de l'Accélérateur Linéaire ( LAL ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Annecy de Physique des Particules ( LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), APC - Gravitation ( APC-Gravitation ), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Max-Planck-Institut-Max-Planck-Institut, Laboratoire des matériaux avancés ( LMA ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), F., Acernese, Avino, Saverio, Calloni, Enrico, DE ROSA, Rosario, L., DI FIORE, Garufi, Fabio, Giordano, Lara, Milano, Leopoldo, Mosca, Simona, Pardi, Silvio, Russo, Guido, Solimeno, Salvatore, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics and Astronomy (miscellaneous), SCIENCE RUN, FOS: Physical sciences, Astrophysics, General Relativity and Quantum Cosmology (gr-qc), 01 natural sciences, 7. Clean energy, General Relativity and Quantum Cosmology, [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], DATA ANALYSIS, Coincident, 0103 physical sciences, Astronomical interferometer, DETECTORS, LIGO DATA, ALGORITHM, SDG 7 - Affordable and Clean Energy, 010306 general physics, Physics, Cross-correlation, AURIGA, 010308 nuclear & particles physics, Gravitational wave, Detector, Settore FIS/01 - Fisica Sperimentale, GRAVITATIONAL WAVES, Interferometry, VIRGO, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Energy (signal processing)
Abstract

We present a method to search for transient GWs using a network of detectors with different spectral and directional sensitivities: the interferometer Virgo and the bar detector AURIGA. The data analysis method is based on the measurements of the correlated energy in the network by means of a weighted cross-correlation. To limit the computational load, this coherent analysis step is performed around time-frequency coincident triggers selected by an excess power event trigger generator tuned at low thresholds. The final selection of GW candidates is performed by a combined cut on the correlated energy and on the significance as measured by the event trigger generator. The method has been tested on one day of data of AURIGA and Virgo during September 2005. The outcomes are compared to the results of a stand-alone time-frequency coincidence search. We discuss the advantages and the limits of this approach, in view of a possible future joint search between AURIGA and one interferometric detector., Comment: 11 pages, 6 figures, submitted to CQG special issue for Amaldi 7 Proceedings

Published
2008

24. Towards Large Area (111)3C-SiC Films Grown on off-oriented (111)Si

Author

Severino A, Anzalone R, Bongiorno C, Italia M, Abbondanza G, Camarda M, Perdicaro LMS, Condorelli G, Mauceri M, and La Via F

Abstract

The choice of off-axis (111) Si substrates is poorly reported in literature despite of the ability of such an oriented Si substrate in the reduction of stacking faults generation and propagation. The introduction of off-axis surface would be relevant for the suppression of incoherent boundaries. We grew 3C-SiC films on (111) Si substrates with a miscut angle from 3¬? to 6¬? along and . The film quality was proved to be high by X-Ray diffraction (XRD) characterization. Transmission electron microscopy was performed to give an evaluation of the stacking fault density while pole figures were conducted to detect microtwins. Good quality single crystal 3C-SiC films were finally grown on 6 inch off-axis (111)Si substrate. The generated stress on both 2 and 6 inch 3C-SiC wafers has been analyzed and discussed. ¬© (2009) Trans Tech Publications, Switzerland.

Published
2008

26. First joint gravitational waves search by the Auriga-Explorer-Nautilus-Virgo collaboration

Author

Acernese, F., Amico, P., Alshourbagy, M., Antonucci, F., Aoudia, S., Astone, P., Avino, S., Babusci, D., Baggio, L., Ballardin, G., Barone, F., Barsotti, L., Barsuglia, M., Bassan, M., Bauer, Th.S., Bignotto, M., Bigotta, S., Birindelli, S., Bizouard, M.A., Boccara, C., Bonaldi, M., Bondu, F., Bosi, L., Bradaschia, C., Braccini, S., van den Brand, J.F.J., Brillet, A., Brisson, V., Buskulic, D., Cagnoli, G., Calloni, E., Campagna, E., Camarda, M., Carbognani, F., Carelli, P., Cavalier, F., Cavalieri, R., Cavallari, G., Cavanna, Flavio, Cella, G., Cerdonio, M., Cesarini, E., Chassande-Mottin, E., Chincarini, A., Clapson, A.C., Cleva, F., Coccia, Eugenio, Conti, L., Corda, C., Corsi, A., Cottone, F., Coulon, J.P., Cuoco, E., D'Antonio, S., Dari, A., Dattilo, V., Davier, M., del Prete, M., De Rosa, R., Di Fiore, L., Di Lieto, A., Di Virgilio, A., Drago, M., Dubath, F., Dujardin, B., Evans, M., Fafone, V., Falferi, P., Ferrante, I., Fidecaro, Francesco, Fiori, I., Flaminio, R., Foffa, S., Fortini, P., Fournier, J.D., Frasca, S., Frasconi, F., Gammaitoni, L., Garufi, F., Gemme, Gianluca, Genin, E., Gennai, A., Giazotto, A., Giordano, G., Giordano, L., Granata, V., Greverie, C., Grosjean, D., Guidi, G., Hamdani, S., Hebri, S., Heitmann, H., Hello, P., Huet, D., Kreckelbergh, S., La Penna, P., Laval, M., Leroy, N., Letendre, N., Liguori, N., Longo, S., Lopez, B., Lorenzini, M., Loriette, V., Losurdo, G., Mackowski, J.M., Maggiore, M., Majorana, E., Marini, A., Man, C.N., Mantovani, M., Marchesoni, F., Marion, F., Marque, J., Martelli, F., Masserot, A., Menzinger, F., Mezzena, R., Minenkov, Y., Milano, L., Mion, A., Modena, I., Modestino, G., Moins, C., Moleti, A., Moreau, J., Morgado, N., Mosca, S., Mours, B., Murtas, G.P., Neri, I., Nocera, F., Ortolan, A., Pagliaroli, G., Palamara, O., Pallottino, G.V., Palomba, C., Paoletti, F., Pardi, S., Parodi, R., Pasqualetti, A., Passaquieti, R., Passuello, D., Piano Mortari, Giovanni, Piergiovanni, F., Pinard, L., Pizzella, G., Poggi, S., Poggiani, R., Prodi, G.A., Punturo, M., Puppo, P., van der Putten, S., Quintieri, L., Rapagnani, P., Re, V., Regimbau, T., Remillieux, A., Ricci, F., Ricciardi, I., Rocchi, A., Romano, R., Ronga, F., Ruggi, P., Russo, G., Salemi, F., Solimeno, S., Spallicci, A., Sturani, R., Taffarello, L., Tarallo, M., Terenzi, R., Tonelli, M., Toncelli, A., Torrioli, G., Tournefier, E., Travasso, F., Tremola, C., Vaccarone, R., Vajente, G., Vandoni, G., Vedovato, G., Verkindt, D., Vetrano, F., Vicere, A., Vinante, A., Vinet, J.Y., Visco, M., Vitale, S., Vocca, H., Yvert, M., Zendri, J.P., Laboratoire des matériaux avancés (LMA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), APC - Cosmologie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), APC - Gravitation (APC-Gravitation), AstroParticule et Cosmologie (APC (UMR_7164)), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, ESPCI ParisTech, Virgo, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), AURIGA, VIRGO, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Laboratoire d'Annecy de Physique des Particules (LAPP), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des matériaux avancés ( LMA ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'Annecy de Physique des Particules ( LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), Physique Corpusculaire et Cosmologie - Collège de France ( PCC ), Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ) -Collège de France ( CdF ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ) -AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Observatoire de Paris-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Laboratoire de l'Accélérateur Linéaire ( LAL ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), APC - Gravitation ( APC-Gravitation ), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Max-Planck-Institut-Max-Planck-Institut, Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux ( ARTEMIS ), Université Nice Sophia Antipolis ( UNS ), Université Côte d'Azur ( UCA ) -Université Côte d'Azur ( UCA ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), F., Acernese, Avino, Saverio, Calloni, Enrico, DE ROSA, Rosario, L., DI FIORE, Garufi, Fabio, Giordano, Lara, Milano, Leopoldo, Mosca, Simona, Pardi, Silvio, Russo, Guido, Solimeno, Salvatore, Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Université Nice Sophia Antipolis (1965 - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
antenne risonanti, Physics and Astronomy (miscellaneous), Population, Onde gravitazionali, interferometri, 01 natural sciences, General Relativity and Quantum Cosmology, [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Constant false alarm rate, Coincident, 0103 physical sciences, DETECTORS, 010306 general physics, education, FILTER, RUN, Physics, education.field_of_study, AURIGA, General Relativity and Cosmology, 010308 nuclear & particles physics, Gravitational wave, Settore FIS/01 - Fisica Sperimentale, Detector, Galactic Center, Astronomy, Data set, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]
Abstract

We present results of the search for coincident burst excitations over a 24 hours long data set collected by AURIGA, EXPLORER, NAUTILUS and Virgo detectors during September 2005. The search of candidate triggers was performed independently on each of the data sets from single detectors. We looked for two-fold time coincidences between these candidates using an algorithm optimized for a given population of sources and we calculated the efficiency of detection through injections of templated signal waveforms into the streams of data. To this purpose we have considered the case of signals shaped as damped sinusoids coming from the galactic center direction. In this framework our method targets an optimal balance between high efficiency and low false alarm rate, aiming at setting confidence intervals as stringent as possible in terms of the rate of the selected source models. We present results of the search for coincident burst excitations over a 24 hours long data set collected by AURIGA, EXPLORER, NAUTILUS and Virgo detectors during September 2005. The search of candidate triggers was performed independently on each of the data sets from single detectors. We looked for two-fold time coincidences between these candidates using an algorithm optimized for a given population of sources and we calculated the efficiency of detection through injections of templated signal waveforms into the streams of data. To this purpose we have considered the case of signals shaped as damped sinusoids coming from the galactic center direction. In this framework our method targets an optimal balance between high efficiency and low false alarm rate, aiming at setting confidence intervals as stringent as possible in terms of the rate of the selected source models.

Published
2008

27. A cross-correlation method to search for GW bursts with AURIGA and Virgo

Author

Bignotto, M., Bonaldi, m, Camarda, m, Cerdonio, m, Conti, l, Drago, m, Falferi, p, Liguori, n, Longo, s, Mezzena, r, Mion, a, Ortolan, a, Prodi, G A., v, Re, Salemi, F., Taffarello, l, Vedovato, g, Vinante, a, Vitale, s, Zendri, J P., Acernese, F., Alshourbagy, m, Amico, p, Antonucci, f, Aoudia, s, Astone, p, Avino, s, Baggio, L., Ballardin, g, Barone, f, Barsotti, l, Barsuglia, m, Bauer, Th S., Bigotta, s, Birindelli, S., Boccara, c, Bondu, f, Bosi, l, Braccini, s, Bradaschia, c, Brillet, a, Brisson, v, Buskulic, D., Cagnoli, g, Calloni, e, Campagna, e, Carbognani, f, Cavalier, f, Cavalieri, r, Cella, G., Cesarini, Elisabetta, E Chassande Mottin, Clapson, A C., Cleva, f, Coccia, e, Corda, c, Corsi, A., Cottone, f, Coulon, J P., Cuoco, e, D'Antonio, s, Dari, a, Dattilo, v, Davier, m, De Rosa, R., M Del Prete, L Di Fiore, A Di Lieto, M Di Paolo Emilio, A Di Virgilio, Evans, M., Fafone, v, Ferrante, i, Fidecaro, f, Fiori, i, Flaminio, r, Fournier, J D., Frasca, S., Frasconi, f, Gammaitoni, l, Garufi, f, Genin, e, Gennai, a, Giazotto, a, Giordano, L., Granata, v, Greverie, c, Grosjean, d, Guidi, GIANLUCA MARIA, Hamdani, s, Hebri, s, Heitmann, H., Hello, p, Huet, d, Kreckelbergh, s, P La Penna, Laval, m, Leroy, n, Letendre, n, Lopez, B., Lorenzini, m, Loriette, v, Losurdo, g, Mackowski, J M., Majorana, e, Man, C N., Mantovani, M., Marchesoni, f, Marion, f, Marque, j, Martelli, Filippo, Masserot, a, Menzinger, f, Milano, L., Minenkov, y, Moins, c, Moreau, j, Morgado, n, Mosca, s, Mours, b, Neri, i, Nocera, F., Pagliaroli, g, Palomba, c, Paoletti, f, Pardi, s, Pasqualetti, a, Passaquieti, r, Passuello, D., Piergiovanni, Francesco, Pinard, l, Poggiani, r, Punturo, m, Puppo, p, Rapagnani, p, Regimbau, T., Remillieux, a, Ricci, f, Ricciardi, i, Rocchi, a, Rolland, l, Romano, r, Ruggi, p, Russo, G., Solimeno, s, Spallicci, a, Swinkels, B L., Tarallo, m, Terenzi, r, Toncelli, a, Tonelli, M., Tournefier, e, Travasso, f, Vajente, g, van den Brand, J. F. J., S van der Putten, Verkindt, D., Vetrano, Flavio, Vicere', Andrea, Vinet, J Y., Vocca, h, and Yvert, M.

Published
2008

29. Atomistic and Continuum Simulations of the Homo-epitaxial Growth of SiC

Author

Camarda M, La Magna A, and La Via F

Subjects
Condensed Matter::Materials Science
Abstract

Using joined super-lattice Kinetic Monte Carlo simulations, continuous modelling and recent experimental data on the homoepitaxial growth of 4H Silicon Carbide we study the transition between monocrystalline and polycrystalline growth in terms of misorientation cut, growth rate and temperature. We compare these optimally calibrated results both with previous continuous models and literature data. We demonstrate that this study was, indeed, necessary to correctly reformulate the phase diagram of the transition. © (2009) Trans Tech Publications, Switzerland.

Published
2008

30. Thick Epitaxial Layers Growth by Chlorine Addition

Author

La Via F, Izzo G, Camarda M, Abbondanza G, and Crippa D

Abstract

The growth rate of 4H-SiC epi layers has been increased up to 100 OEºm/h by chlorine addition. The epitaxial layers grown with this process have been characterized by electrical, optical and structural characterization methods. Very thick (> 100 OEºm) epitaxial layer has been grown and the Schottky diodes realized on these layers have good yield (> 87%) with a low defect density (10/cm2). This process gives the opportunity to realize very high power devices with breakdown voltages in the range of 10 kV or X-Ray and particle detectors with a low cost epitaxy process. ¬© (2009) Trans Tech Publications, Switzerland.

Published
2008

37. First Characterization of Novel Silicon Carbide Detectors with Ultra-High Dose Rate Electron Beams for FLASH Radiotherapy

Author

Francesco Romano, Giuliana Milluzzo, Fabio Di Martino, Maria Cristina D’Oca, Giuseppe Felici, Federica Galante, Alessia Gasparini, Giulia Mariani, Maurizio Marrale, Elisabetta Medina, Matteo Pacitti, Enrico Sangregorio, Verdi Vanreusel, Dirk Verellen, Anna Vignati, Massimo Camarda, Romano, F, Milluzzo, G, Di Martino, F, D'Oca, MC, Felici, G, Galante, F, Gasparini, A, Mariani, G, Marrale, M, Medina, E, Pacitti, M, Sangregorio, E, Vanreusel, V, Verellen, D, Vignati, A, and Camarda, M

Subjects
FLASH radiotherapy, Silicon Carbide, dosimetry, beam monitoring, UHDR, Fluid Flow and Transfer Processes, Physics, Process Chemistry and Technology, General Engineering, Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin), Computer Science Applications, Chemistry, General Materials Science, Human medicine, Instrumentation
Abstract

Ultra-high dose rate (UHDR) beams for FLASH radiotherapy present significant dosimetric challenges. Although novel approaches for decreasing or correcting ion recombination in ionization chambers are being proposed, applicability of ionimetric dosimetry to UHDR beams is still under investigation. Solid-state sensors have been recently investigated as a valuable alternative for real-time measurements, especially for relative dosimetry and beam monitoring. Among them, Silicon Carbide (SiC) represents a very promising candidate, compromising between the maturity of Silicon and the robustness of diamond. Its features allow for large area sensors and high electric fields, required to avoid ion recombination in UHDR beams. In this study, we present simulations and experimental measurements with the low energy UHDR electron beams accelerated with the ElectronFLASH machine developed by the SIT Sordina company (IT). The response of a newly developed 1 × 1 cm2 SiC sensor in charge as a function of the dose-per-pulse and its radiation hardness up to a total delivered dose of 90 kGy, was investigated during a dedicated experimental campaign, which is, to our knowledge, the first characterization ever done of SiC with UHDR-pulsed beams accelerated by a dedicated ElectronFLASH LINAC. Results are encouraging and show a linear response of the SiC detector up to 2 Gy/pulse and a variation in the charge per pulse measured for a cumulative delivered dose of 90 kGy, within ±0.75%.

Published
2023

38. Near-Infrared-Responsive Choline-Calix[4]arene-Gold Nanostructures for Potential Photothermal Cancer Treatment

Author

Grazia M. L. Consoli, Giuseppe Forte, Ludovica Maugeri, Valeria Consoli, Valeria Sorrenti, Luca Vanella, Gianpiero Buscarino, Simonpietro Agnello, Massimo Camarda, Giuseppe Granata, Loredana Ferreri, Salvatore Petralia, Consoli G.M.L., Forte G., Maugeri L., Consoli V., Sorrenti V., Vanella L., Buscarino G., Agnello S., Camarda M., Granata G., Ferreri L., and Petralia S.

Subjects
gold nanostructures, photothermal therapy, molecular modeling, Settore FIS/01 - Fisica Sperimentale, calixarene, General Materials Science, photothermal effect, cancer treatment
Abstract

The development of novel chemical approaches for the fabrication of gold nanostructures with localized surface plasmon resonance (LSPR) falling in the near-infrared (NIR) region is one challenging topic in nanomaterials science. Due to their optical and photothermal properties triggered by light excitation in the therapeutic window (λmax = 650-1300 nm), gold-based nanostructures are appealing candidates in anticancer nanomedicine. Here, we report a novel method to prepare water-dispersible gold nanostructures with NIR-LSPR (λmax = 600-1000 nm) properties. The gold nanostructures were achieved in a single step by an unconventional method using NADH as a reducing agent and an amphiphilic choline-calix[4]arene derivative (CholCalix) forming micelles as a template. The CholCalix-Au nanostructures were characterized by UV-visible spectrophotometry, Raman spectroscopy, and atomic force microscopy. Agglomeration of the nanostructures due to multiple crosslinking interactions was observed and supported by modeling simulation. Effective anticancer photothermal-induced effect of the CholCalix-AuNPs was demonstrated on human breast cancer cells irradiated with biofriendly light at 808 nm.

Published
2023

39. Sull'eterogeneità del Mezzogiorno

Author

Asso, Pier Francesco, Nerozzi, Sebastiano, Pipitone, Vito, Tulumello, Simone, Barca, F, Tulumello, S, Tulumello, A, Alacevich, M, Foderà, F, Laino, G, Trigilia, C, D'Antone, L, Li Destri Nicosia, G, Saija, L, Alongi, A, Camarda, M, Pagliaro, D, Mastropaolo, A, Riolo, C, Pusceddu, A, Cozzolino, A, Micheli, G, Bianchi, L., Asso, Pier Francesco, Nerozzi, Sebastiano, and Pipitone, Vito

Subjects
sviluppo, Local development, mezzogiorno, divari, North-South dualism, Settore SECS-P/06 - Economia Applicata, Inequalitie
Abstract

Il capitolo rappresenta l'ambizioso tentativo di costruire un modello di sviluppo locale in grado di spiegare il "mistero della crescita" e fornire elementi di guida e di riflessione per le diverse componenti coinvolte a realizzare il cambiamento. Un aspetto viene messo in particolare luce: l'analisi quali-quantitativa sulle determinanti della profonda eterogeneità dei Sud, anche di quelli che sono geograficamente, storicamente, tradizionalmente contigui e da lungo tempo radicati in una condizione di relativa e trasversale arretratezza o apparente immobilismo. Questa eterogeneità emerge chiaramente man mano che l'attenzione si sposta ai diversi ambiti di sviluppo locale.

Published
2022

40. Elution time changes due to anomalous DEP effects in microchannels under uniform and non-uniform electric fields

Author

Antonino La Magna, Maria Carla Gilardi, Salvatore Francesco Lombardo, Francesco Di Raimondo, Antonino Magliano, Alessandra Romano, Massimo Camarda, Silvia Scalese, Rossana Di Martino, Giorgio Ivan Russo, Michele Cascio, Luigi Minafra, Magliano, A, Camarda, M, Lombardo, S, Di Martino, R, Cascio, M, Romano, A, Minafra, L, Russo, G, Gilardi, M, Di Raimondo, F, Scalese, S, and La Magna, A

Subjects
Cell diffusion, Analytical chemistry, Dielectrophoresis, 02 engineering and technology, Discrete dipole approximation, circulating tumor cells, 01 natural sciences, Molecular physics, complex mixtures, Anomalous DEP, Electric field, 0103 physical sciences, Anomalous DEP, Cell diffusion, Dielectrophoresis, Field flow fractionation, Electrical and Electronic Engineering, 010302 applied physics, Field flow fractionation, Elution, Chemistry, Continuous mode, respiratory system, 021001 nanoscience & nanotechnology, Electronic, Optical and Magnetic Materials, respiratory tract diseases, DEP device, lcsh:TA1-2040, Signal Processing, Electrode, Particle, 0210 nano-technology, lcsh:Engineering (General). Civil engineering (General), Biotechnology
Abstract

Conventional dielectrophoresis (DEP) force on cell and particle is altered in the proximity of the electrodes due to the failure of the dipole approximation. In these conditions an anomalous DEP (aDEP) force rules the particle manipulation. Anyhow, the role of the aDEP is barely considered in the design of DEP devices. Here we analyze, using a multiscale simulation approach, the aDEP effects in micro-fluidic device coupled with interdigitated channel commonly used in continuous mode field flow fractionation dielectrophoretic (FFF-DEP) devices for the separation of circulating tumor cells (MDA) and Lymphocytes (LYM). We study the propagation of an injected density of MDA and LYM respectively and evaluate how the aDEP changes the migrations of the cells. Keywords: Dielectrophoresis, Anomalous DEP, Field flow fractionation, Cell diffusion

Published
2016

41. Sicilia—silicon carbide detectors for intense luminosity investigations and applications

Author

Giovanni Casini, Dario Giove, G. Lanzalone, C. Ciampi, C. Agodi, Giacomo Borghi, G. C. Bussolino, Francesco La Via, Giuseppe Longo, Alberto Fazzi, Salvatore Tudisco, Massimo Zimbone, Salvatore Cascino, Massimo Camarda, Marco Mauceri, C. Altana, Sabina Ronchin, Marica Rebai, Giada Petringa, Valeria Puglisi, G.A.P. Cirrone, Maurizio Moschetti, A. Trifirò, Giacomo Poggi, Grazia Litrico, Stefania Privitera, Manuela Cavallaro, Gabriele Pasquali, Giacomo Cuttone, Sebastiana Puglia, Antonello Santangelo, Maurizio Boscardin, Roberto Modica, Luca Labate, Lucia Calcagno, Andrea Stefanini, Diana Carbone, Annamaria Muoio, Nicolò Piluso, Francesco Cappuzzello, Domenico Lo Presti, G. Gorini, F. Musumeci, Tudisco, S, La Via, F, Agodi, C, Altana, C, Borghi, G, Boscardin, M, Bussolino, G, Calcagno, L, Camarda, M, Cappuzzello, F, Carbone, D, Cascino, S, Casini, G, Cavallaro, M, Ciampi, C, Cirrone, G, Cuttone, G, Fazzi, A, Giove, D, Gorini, G, Labate, L, Lanzalone, G, Litrico, G, Longo, G, Presti, D, Mauceri, M, Modica, R, Moschetti, M, Muoio, A, Musumeci, F, Pasquali, G, Petringa, G, Piluso, N, Poggi, G, Privitera, S, Puglia, S, Puglisi, V, Rebai, M, Ronchin, S, Santangelo, A, Stefanini, A, Trifiro, A, and Zimbone, M

Subjects
Photon, Materials science, Silicon, Physics::Instrumentation and Detectors, chemistry.chemical_element, Nuclear and particle detector, Radiation hardness, Silicon carbide, Analytical Chemistry, Atomic and Molecular Physics, and Optics, Biochemistry, Instrumentation, Electrical and Electronic Engineering, 02 engineering and technology, lcsh:Chemical technology, radiation hardness, 01 natural sciences, Article, chemistry.chemical_compound, Condensed Matter::Materials Science, Atomic and Molecular Physics, 0103 physical sciences, Radiation hardne, lcsh:TP1-1185, nuclear and particle detector, silicon carbide, Radiation hardening, Luminosity (scattering theory), 010308 nuclear & particles physics, Detector, 021001 nanoscience & nanotechnology, Engineering physics, chemistry, Particle physics experiments, and Optics, 0210 nano-technology, Beam (structure)
Abstract

Silicon carbide (SiC) is a compound semiconductor, which is considered as a possible alternative to silicon for particles and photons detection. Its characteristics make it very promising for the next generation of nuclear and particle physics experiments at high beam luminosity. Silicon Carbide detectors for Intense Luminosity Investigations and Applications (SiCILIA) is a project starting as a collaboration between the Italian National Institute of Nuclear Physics (INFN) and IMM-CNR, aiming at the realization of innovative detection systems based on SiC. In this paper, we discuss the main features of silicon carbide as a material and its potential application in the field of particles and photons detectors, the project structure and the strategies used for the prototype realization, and the first results concerning prototype production and their performance.

Published
2018

42. Modelli di collaborazione fra imprese e dotazioni di capitale sociale

Author

ASSO, Pier Francesco, Pavolini, E., Asso, P, Pavolini, E, Foderà, Camarda, M, Pierleoni, M, Diotallevi, A, Bartoli, F, Larotonda, R, Rotondi, Z, Righi, A, Nuccitelli, A, Nerozzi, S, Pipitone, V, Ricchiuti, G, Azzolina, L, Biagiotti, A, and Pavolini, E.

Subjects
Capitale sociale, performance economica, cooperazione fra imprese, Settore SPS/09 - Sociologia Dei Processi Economici E Del Lavoro, Settore SECS-P/06 - Economia Applicata
Abstract

Dopo aver esposto le principali linee di ricerca sul capitale sociale, ci si sofferma ad analizzare i principali risultati di una ricerca originale sulle imprese, dedicando particolare attenzione al ruolo dei costi di transazione e alla relazione fra cooperazione e performance economica

Published
2014

43. Diffuse soil CO2 degassing from Linosa island

Author

Vincenzo Stagno, Dario Cellura, Marco Camarda, Mariano Valenza, Cellura, D, Stagno, V, Camarda, M, and Valenza, M

Subjects
Volcano monitoring, Lineament, Geochemistry, soil degassing,fluid geochemistry,CO2, lcsh:QC851-999, Instruments and techniques, Soil degassing, Geophysics, Sequential Gaussian simulation, Soil co2 flux, Flux (metallurgy), Geomorphology, geography, geography.geographical_feature_category, Rift, lcsh:QC801-809, Settore GEO/08 - Geochimica E Vulcanologia, Tectonics, lcsh:Geophysics. Cosmic physics, Volcano, Linosa, Soil CO_2 flux, lcsh:Meteorology. Climatology, Geology, Channel (geography)
Abstract

Herein, we present and discuss the result of 148 measurements of soil CO2 flux performed for the first time in Linosa island (Sicily Channel, Italy), a Plio-Pleistocene volcanic complex no longer active but still of interest owing to its location within a seismically active portion of the Sicily Channel rift system. The main purpose of this survey was to assess the occurrence of CO2 soil degassing, and compare flux estimations from this island with data of soil degassing from worldwide active volcanic as well as non-volcanic areas. To this aim soil CO2 fluxes were measured over a surface of about 4.2 km2 covering ~80% of the island. The soil CO2 degassing was observed to be mainly concentrated in the eastern part of the island likely due to volcano-tectonic lineaments, the presence of which is in good agreement with the known predominant regional faults system. Then, the collected data were interpreted using sequential Gaussian simulation that allowed estimating the total CO2 emissions of the island. Results show low levels of CO2 emissions from the soil of the island (~55 ton d-1) compared with CO2 emissions of currently active volcanic areas, such as Miyakejima (Japan) and Vulcano (Italy). Results from this study suggest that soil degassing in Linosa is mainly fed by superficial organic activity with a moderate contribution of a deep CO2 likely driven by NW-SE trending active tectonic structures in the eastern part of the island.

Published
2014

44. Fiducia, Partecipazione a reti e performance economica

Author

Nerozzi, Sebastiano, Asso, Pier Francesco, Pavolini, Emmanuele, Asso, P, Pavolini, E, Foderà, Camarda, M, Pierleoni, M, Diotallevi, A, Bartoli, F, Larotonda, R, Rotondi, Z, Righi, A, Nuccitelli, A, Nerozzi, S, Pipitone, V, Ricchiuti, G, Azzolina, L, and Biagiotti, A

Subjects
Capitale sociale, legami forti, performance economica, reti fra imprese, Settore SPS/09 - Sociologia Dei Processi Economici E Del Lavoro, fiducia, Settore SECS-P/06 - Economia Applicata
Abstract

Nell'ambito di una ricerca originale su un campione rappresentativo di imprese operanti in un numero selezionato di settori, è stato analizzato il ruolo della fiducia interpersonale e della fiducia istituzionale nel determinare una maggiore o minore propensione a collaborare; inoltre è stata approfondita la relazione fra partecipazione a reti (formali e informali) e performance economica, distinguendo anche il caso in cui le reti sono il risultato di legami forti di tipo parentale o amicale

Published
2014

45. Theoretical and experimental study of the kinetics of particle chains near electrodes in dielectrophoretic devices

Author

A. La Magna, M. Camarda, Valentina Bravatà, Gi Forte, Silvia Scalese, Luigi Minafra, Gianluca Giustolisi, Mc Gilardi, Bravata, F. Di Raimondo, Fabrizio Vicari, Marzia Pucci, Alessandra Romano, S. Baldo, Fp Cammarata, Andrea Ballo, Giuseppe Russo, Camarda, M, Baldo, S, Scalese, S, Ballo, A, Giustolisi, G, Romano, A, Di Raimondo, F, Pucci, M, Vicari, F, Minafra, L, Cammarata, FP, Bravata, V, Forte, GI, Russo, G, Gilardi, MC, and La Magna, A

Subjects
Materials science, kinetics of particle chains, dielectrophoretic devices, particle chains, Kinetics, Electrode, Dielectrophoresis, Analytical chemistry, cells, Particle chains, Nanotechnology
Abstract

Using a three dimensional coupled Monte Carlo-Poisson algorithm and experimental results we studied the role of the particle-particle dipole interaction on the kinetics of a system of human cells suspended in a static liquid medium under the action of an oscillating non-uniform electric field generated by polynomial electrodes. We found that the kinetics of the cells during negative/repulsive dielectrophoresis depends on the local distribution of particles. If the cells have generated long chains during positive/attractive dielectrophoresis, such chains can hinder subsequent detachment resulting in a reduction of the separation/manipulation efficiency of dielectrophoretic device. This effect can be avoided by proper design of the electrodes schema.

Published
2014

46. Effects of soil gas permeability and recirculation flux on soil CO2 flux measurements performed using a closed dynamic accumulation chamber

Author

Mariano Valenza, Marco Camarda, Sergio Gurrieri, Camarda, M, Gurrieri, S, and Valenza, M

Subjects
Hydrology, Empirical equations, CO2 output, Soil gas, Co2 flux, Geology, Soil science, Soil CO2 flux, Gas analyzer, Soil co2 flux, Soil gas permeability, Settore GEO/08 - Geochimica E Vulcanologia, Permeability (earth sciences), Flux (metallurgy), Measurement device, Geochemistry and Petrology, Closed dynamic chamber
Abstract

Dynamic accumulation chamber methods have been extensively used to estimate the total output of CO2 released from active volcanic area. In order to asses the performance and reliability of a closed dynamic system several tests were carried out with different soil permeabilities and soil CO2 fluxes. A special device was used to create a constant one-dimensional CO2 flux through a soil column with a known permeability. Three permeabilities were investigated, ranging between 3.6 × 10− 2 and 3.5 × 10 μm2, as were several CO2 fluxes (ranging between 1.1 × 10− 6 and 6.3 × 10− 5 kg m− 2 s− 1). The results highlight that the accuracy of soil CO2 flux measurements strictly depends on the soil gas permeability and the soil CO2 flux regimen. Generally chamber measurements underestimate CO2 fluxes at low soil permeability and low soil CO2 fluxes, whereas appreciable overestimations occur for high permeability soil, especially for high soil CO2 fluxes. Other tests carried out with different settings for the measurement device, such as the chamber volume and the flux of the pump used to recirculate air through the chamber and the gas analyzer (recirculation flux), revealed a strong dependence of the closed dynamic chamber measurements on the recirculation flux. Low recirculation fluxes (0.2–0.4 l min− 1) decreased the performance of the measurement system, causing underestimations of the actual soil CO2 flux, whereas higher values (0.6–1.0 l min− 1) resulted in overestimations, especially for elevated soil CO2 fluxes. An empirical equation was deduced to allow accumulation chamber fluxes to be calculated very accurately based on soil gas permeabilities measured in the field.

Published
2009

47. A PET prototype for in-beam monitoring of proton therapy

Author

M. Camarda, Nicola Belcari, F. Di Rosa, Sara Vecchio, Nico Lanconelli, A. Del Guerra, Giacomo Cuttone, S. Moehrs, Giorgio Ivan Russo, F. Attanasi, Valeria Rosso, G. A. Pablo Cirrone, S. Vecchio, F. Attanasi, N. Belcari, M. Camarda, G. A. P. Cirrone, G. Cuttone, A. Del Guerra, F. Di Rosa, S. Moehr, N. Lanconelli, V. Rosso, G. Russo, Vecchio S., Attanasi F., Belcari N., Camarda M., Cirrone G. A. P., Cuttone G., Di Rosa F., Lanconelli N., Moehrs S., Rosso V., Russo G., and Del Guerra A.

Subjects
Nuclear and High Energy Physics, Photomultiplier, Materials science, business.industry, Lyso, Optics, Planar, Nuclear Energy and Engineering, Beamline, Dosimetry, Positron emission, Tomography, Electrical and Electronic Engineering, Nuclear medicine, business, Proton therapy, Beam (structure)
Abstract

The in-beam PET is a novel PET application to image the beta+ activity induced in biological tissues by hadronic therapeutic beams. Thanks to the correlation existing between beam-delivered dose profiles and beam-induced activity profiles, in vivo information about the effective ion paths can be extracted from the in-beam PET image. In-situ measurements, immediately after patient irradiation, are recommended in order to exploit the maximum statistics, by detecting the contribution provided by short lived isotopes. A compact, dedicated tomograph should then be developed for such an application, so as to be used in the treatment room. We have realized a small PET prototype in order to demonstrate the feasibility of such technique for the monitoring of proton therapy of ocular tumors at the CATANA facility (Catania, Italy). The DoPET (dosimetry with a positron emission Tomograph) tomograph consists of two planar heads, with an active area of about 5 cm x 5 cm. Each head is made up of a squared position sensitive photomultiplier (Hamamatsu H8500) coupled to a matrix of the same size of LYSO scintillating crystals (2 mm times 2 mm times 18 mm pixel dimensions). Dedicated, compact electronic boards are used for the signal multiplexing, amplification and digitization. The distance between the pair can be set from 10 cm up to a maximum of about 20 cm. The validation of the prototype was performed using 62 MeV protons at the CATANA beam line and plastic phantoms. Different dose distributions have been delivered and a good correlation between the distal fall-off of the activity profiles and of the dose profiles was found, i.e., better than 2 mm along the beam direction.

Published
2007

50. General interpolation scheme for thermal fluctuations in superconductors

Author

Luca Marotta, Massimo Camarda, Fabio Siringo, Giuseppe G. N. Angilella, Marotta, L, Camarda, M, Angilella, GGN, and Siringo F.

Subjects
Physics, Superconductivity, Condensed Matter - Superconductivity, superconductivity, fluctuations, Gaussian, FOS: Physical sciences, high-Tc superconductors, Thermal fluctuations, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Superconductivity (cond-mat.supr-con), symbols.namesake, Variational method, Mean field theory, Quantum electrodynamics, symbols, Ginzburg–Landau theory, Statistical physics, Gauge theory, Superconductivity, phenomenological theories, Interpolation theory
Abstract

We present a general interpolation theory for the phenomenological effects of thermal fluctuations in superconductors. Fluctuations are described by a simple gauge invariant extension of the gaussian effective potential for the Ginzburg-Landau static model. The approach is shown to be a genuine variational method, and to be stationary for infinitesimal gauge variations around the Landau gauge. Correlation and penetration lengths are shown to depart from the mean field behaviour in a more or less wide range of temperature below the critical regime, depending on the class of material considered. The method is quite general and yields a very good interpolation of the experimental data for very different materials., some misprints have been corrected in Eq.(15),(19); more references and comments have been added

Published
2006

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