http://hdl.handle.net/2122/291 2013-06-19T03:13:12Z http://hdl.handle.net/2122/8699 Title: On the Divergenceless Property of the Magnetic Induction Field Authors: Severini, S.; Centro Interforze Studi per le Applicazioni Militari (CISAM), Via Bigattiera Lato Monte 10, San Piero a Grado, 56122 Pisa, Italy; Settimi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Abstract: Maxwell’s equations beautifully describe the electromagnetic fields properties. In what follows we will be interested in giving a new perspective to divergence-free Maxwell’s equations regarding the magnetic induction field: divB=0. To this end we will consider some physical aspects of a system consisting of massive nonrelativistic charged articles, as sources of an electromagnetic field (e.m.) propagating in free space. In particular the link between conservation of total momentum and divergence-free condition for the magnetic induction B field will be deeply investigated.This study presents a new context in which the necessary condition for the divergence-free property of the magnetic induction field in the whole space, known as solenoidality condition, directly comes from the conservation of total momentum for the system, that is, sources and field. This work, in general, leads to results that leave some open questions on the existence, or at least the bservability, of magnetic monopoles, theoretically plausible only under suitable symmetry assumptions as we will show. 2013-02-28T23:00:00Z http://hdl.handle.net/2122/8657 Title: Geodetic Problems of an Expanding Globe - Simple Critical Arguments Authors: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Editors: Scalera, Giancarlo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Boschi, Enzo; University of Bologna; Cwojdzinski, Stefan; Polish Geological Survey Abstract: Because unequivocal evidence exist in favor of the expansion of the globe through geologic time, and if the expansion of our planetary body is ongoing today and not confined to the past or episodic in time, some subtle causes must consequently exist of the inability of Geodesy in revealing a plausible expansion rate. Old critical arguments around the possibility of a vicious circle in the geodetic theoretical methods (Blinov, 1987; Scalera, 2003) has revealed their inadequacy in respect of the geometry of space geodesy. On the bases of an old argument (Scalera, 2003), it has been then developed a new more realistic one, in which it is demonstrated that spurious effects can probably bias what is believed to be systematic-error-free data. It is argued that Geodesy still has to full develop a theoretical treatment of an expanding globe 2012-11-30T23:00:00Z http://hdl.handle.net/2122/8551 Title: GIS Methodology to Assess Landslide Susceptibility: Application to a River Catchment of Central Italy Authors: Leoni, G.; Consultant Geologist,; Barchiesi, F.; Roma Tre University; Catallo, F.; Roma Tre University; Dramis, F.; Roma Tre University; Fubelli, G.; Roma Tre University; Lucifora, S.; Roma Tre University; Mattei, M.; Roma Tre University; Pezzo, G.; Department of Geological Sciences, Roma Tre University; Puglisi, C.; ENEA, C.R. Casaccia Abstract: This paper illustrates a geographic information system (GIS) supported methodology for the assessment of landslide susceptibility. The methodology involves four operational steps: survey, site analysis, macro- area analysis and susceptibility analysis . The Survey includes the production (or acquisition) of a large-scale litho-technical map, a large-scale geomorphological map, a detailed inventory of past and present land- slide events, and a high resolution DTM (Digital Terrain Model. Site analysis leads to the definition of discriminating parameters (commonly, lithological and morphometric conditions necessary but not suffi- cient to trigger a landslide of a given type) and predisposing factors (conditions that worsen slope stability but are not sufficient to trigger a landslide of a given type in the absence of discriminating parameters ). The different predisposing factors are subdivided into classes, whose intervals are established by descriptive, statistical analysis of landslide inventory data. A numerical index, based on the frequency of landslide occurrence, quantifies the contribution of each class to slope instability. Macro-area analysis includes the generation of Litho-Morphometric Units (LMU) by overlaying discrimina- ting parameters , manual drawing of LMU envelopes ( macro-areas ), generation of predisposing factor maps from the spatial distribution of predisposing factors , and heuristic weighting of predisposing factor indices. Susceptibility analysis includes the generation of Homogeneous Territorial Units (HTU) by overlaying macro- areas and predisposing factor maps , and the application of a susceptibility function to the different HTU. The resulting values are normalized before the generation of the landslide susceptibility maps . The methodo- logy has been applied to the Fiumicino River catchment, located in the western side of Latium Apennine (Central Italy) between 200 and 1300 m a.s.l. and developed on Late Miocene calcarenites, sandstones with clay intercalations, and marls. The resulting landslide susceptibility maps will be employed in envi- ronmental management. They also represent the preliminary step for the assessment of landslide hazard and risk 2012-01-22T23:00:00Z http://hdl.handle.net/2122/8513 Title: Characterization of decay in the wooden roof of the S. Agata church of Ragusa Ibla (southeastern Sicily) by means of sonic tomography and Resistograph® penetration tests Authors: Imposa, S.; Mele, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Corrao, M.; Coco, G.; Battaglia, G. Abstract: We describe the results of a sonic tomography survey and penetration tests carried out inside the S. Agata church of Ragusa Ibla, in southeastern Sicily (Italy). The purpose of this work was to evaluate the extent of decay in some of the ancient wooden trusses of the nave's roof, in view of possible strengthening interventions. Sonic tomography is entirely non-invasive and is suitable to investigate large portions of a structure, although in a qualitative way, while penetration tests are little invasive, point measurements that enable high-resolution detection of wood decay and cracks. We combined the two techniques to investigate the internal condition of 4 trusses that looked most deteriorated at a preliminary visual inspection. Results showed that decays occur mainly next to the walls, due to rainwater infiltration, and on the side of the timbers facing the rear of the nave; in general, chords have worse mechanical properties than rafters. 2012-12-31T23:00:00Z http://hdl.handle.net/2122/8319 Title: SOLENOIDALITÀ DEL CAMPO DI INDUZIONE MAGNETICA E CONSERVAZIONE DELLA QUANTITÀ DI MOTO TOTALE Authors: Severini, S.; C.I.S.A.M. – R.T.O. /Divisione E.M.C. Via Bigattiera Lato Monte 10 56122 S.Piero a Grado (PI),; Settimi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Editors: Monorchio, A.; Dipartimento di Ingegneria dell'Informazione Universita` di Pisa via Diotisalvi 2 -- 56126 PISA Abstract: Il seguente proceeding si propone di discutere gli aspetti fisici di un sistema costituito da particelle cariche, massive e non relativistiche, quali sorgenti in moto di un campo elettromagnetico (e.m.) che si propaga nello spazio, riempito da un mezzo materiale lineare, omogeneo ed isotropo. Viene studiato il legame fisico tra la conservazione della quantità di moto (q.d.m.) totale e la solenoidalità per il campo di induzione magnetica. Questo studio presenta un nuovo contesto in cui la condizione necessaria per la divergenza nulla dell'induzione magnetica nell'intero spazio, nota come condizione di solenoidalità, deriva direttamente dalla conservazione della q.d.m. totale del sistema, cioè sorgenti più campo. Il lavoro, in generale, giunge a risultati che lasciano alcuni quesiti aperti sull'esistenza, o quantomeno l'osservabilità, dei monopoli magnetici, teoricamente plausibile unicamente sotto opportune ipotesi di simmetria, che, a parere degli autori, potrebbero comunque costituire un interessante argomento di discussione scientifica soprattutto nell' ambito della fisica sperimentale. 2012-05-29T22:00:00Z http://hdl.handle.net/2122/8247 Title: A GIS-based application to volume estimation and spatial distribution analysis of tephra fallout: the 122 BC Etna eruption case study Authors: Bisson, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia; Del Carlo, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia Abstract: In this work we show the use of a geo-spatial information system (GIS) for the volume estimation of fallout deposits and for the identification of syn- and post-eruptive depositional mechanisms. For the first time, we present thickness distribution maps, isopachs maps and fallout deposit volume for the single stratigraphic units (A-F) of the 122 BC Plinian eruption of Etna, the most powerful eruption of this volcano in historical times. Thickness data collected during the field survey were organised in a geo-referenced database and several interpolation algorithms were used to calculate the volumes of the six fallout layers of eruption (units A-F). Results have been compared with those obtained using the Pyle’s method that bases volume calculation on the exponential thickness-decay law of the deposits. Differences in 20 results of the two methods have been analyzed applying 2 and 3D geo-statistical analysis to thickness data and an “ideal” fallout deposit has been used as a reference. Our approach allowed both the identification of stratigraphic sections which deposits were affected by secondary erosional or accumulation phenomena, and the assessment of whether the secondary processes were caused by local morphologic conditions or variation in eruptive dynamics (e.g. rotation of the dispersal axis direction). 2011-12-31T23:00:00Z http://hdl.handle.net/2122/6901 Title: Images of the Iberian Lithosphere from One Local Earthquake Authors: Danecek, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Stich, D.; Instituto Andaluz de Geofísica; Morelli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Abstract: On 12 August 2007, a magnitude Mw 4.7 intraplate earthquake occurred near the center of the Iberian Peninsula, an area characterized by comparably simple crustal structure within the complex Iberia-Maghreb plate boundary zone, and characterized by complete azimuthal coverage with seismic broadband stations. We analyze regional intermediate-period (20s to 50s) coda waveforms for this earthquake. They contain energy representing late-arriving surface waves that have been reflected laterally at lithospheric heterogeneities in or around Iberia, but complexity of the coda waveforms hampers a direct interpretation. We use coda recordings as source for a back-propagating adjoint wave field and compute 3D Born sensitivity kernels for the dependence of least squares waveform misfits of coda waves on wave speed variations. We hereby image the origin of single scattering recorded in the coda. Misfit kernels for P- and S-wave velocity show azimuth-dependent intensity variation as a result of source radiation, and an appropriate compensation significantly improves imaging quality, thereby revealing several clear lineaments. These are interpreted as surface-wave reflectors due to deep-rooted heterogeneity such as terrain boundaries or Moho topography, demonstrating the ability of the approach to unravel complex waveforms, and providing a new point of view on regional lithospheric structure. 2009-12-31T23:00:00Z http://hdl.handle.net/2122/6805 Title: Toward Autonomous, Adaptive, and Context-Aware Multimodal Interfaces: Theoretical and Practical Issues Authors: Esposito, A. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia Editors: Esposito, A.; Second University of Naples and IIASS, International Institute for Advanced Scientific Studies; Esposito, A. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Martone, R.; Dipartemento di Ingegneria dell’ Informazione, Seconda Università di Napoli; Müller, V. C.; Anatolia College/ACT, Department of Humanities and Social Sciences; Scarpetta, G.; University of Salerno and IIASS, International Institute for Advanced Scientific Studies Abstract: This volume brings together the advanced research results obtained by the European COST Action 2102: “Cross Modal Analysis of Verbal and Nonverbal Communication.” The research published in this book was discussed at the Third EUCOGII-COST 2102 International Training School entitled “Toward Autonomous, Adaptive, and Context-Aware Multimodal Interfaces: Theoretical and Practical Issues,” held in Caserta, Italy, during March 15–19, 2010. The school was jointly sponsored by: a) COST (European Cooperation in Science and Technology, www.cost.eu) in the domain of Information and Communication Technologies (ICT) for disseminating the advances of the research activities developed within the COST Action 2102 (cost2102.cs.stir.ac.uk) b) EUCogII: 2nd European Network for the Advancement of Artificial Cognitive Systems, Interaction and Robotics (http://www.eucognition.org/). 2010-12-31T23:00:00Z http://hdl.handle.net/2122/6109 Title: Classical and Quantum Approach of Quasi Normal Modes in Linear Optical Regime: an Application to One Dimensional Photonic Crystals Authors: Settimi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Editors: Bessons, B.; Lambert Academic Publishing (LAP) Abstract: The definition of natural modes for confined structures is one of the central problems in physics, as in nuclear physics, astrophysics, etc. The main problem is due to the boundary conditions, when they are such to push out the problem from the class of Sturm-Liouville. This occurs when boundary conditions imply the presence of eigen-values, as for example when a scatterer excited from the outside gives rise to a transmitted and reflected field. An open cavity with an external or internal excitation represents a “non-canonical “ problem, in the sense of a Sturm–Liouville’s problem, due to the fact that cavity modes couple themselves with external modes. The e.m. field inside an open cavity can be obtained by suitable methods as the transfer matrix or the ray method. The representation of the e.m. field inside an open cavity can be given also as a superposition of Quasi Normal Modes (QNMs) which describe the coupling between the cavity and the environment. The importance of the QNM’s approach lies in the fact that it is possible to recover the orthogonal representation of the e.m. field, as it is necessary to consider quantum and non linear processes. 2010-08-24T22:00:00Z http://hdl.handle.net/2122/5886 Title: Raccomandazioni per la redazione di progetti e l’esecuzione di interventi per la conservazione del costruito archeologico – Recommendations for drawing up projects and carrying out interventions for the conservation of the archaeological built heritage Authors: D'Agostino, S.; Centro Interdipartimentale di Ingegneria per i Beni Culturali- Università di Napoli Federico II; Giuliani, C. F.; Università La Sapienza di Roma; Conforto, M. L.; Soprintendenza Archeologica di Roma; Guidoboni, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Abstract: These recommendations concern all the ancient buildings or other constructions which contribute to giving form and structure to archaeological sites. They constitute an archive of documents of material history and thus a source of historical knowledge. The use of intuitive laws of stability, techniques based on long experience and reproduceable construction modules also makes these structures an archive of the history of building, and hence an essential source of knowledge when it comes to planning conservation interventions. 2009-08-31T22:00:00Z