Aims. We test the effects of re-orienting jets from an active galactic nucleus (AGN) on the intra... more Aims. We test the effects of re-orienting jets from an active galactic nucleus (AGN) on the intracluster medium in a galaxy cluster environment with short central cooling time. We investigate both the appearance and the properties of the resulting cavities, and the efficiency of the jets in providing near-isotropic heating to the cooling cluster core. Methods. We use numerical simulations to explore four models of AGN jets over several active/inactive cycles. We keep the jet power and duration fixed across the models, varying only the jet re-orientation angle prescription. We track the total energy of the intracluster medium (ICM) in the cluster core over time, and the fraction of the jet energy transferred to the ICM. We pay particular attention to where the energy is deposited. We also generate synthetic X-ray images of the simulated cluster and compare them qualitatively to actual observations. Results. Jets whose re-orientation is minimal (≲20°) typically produce conical structu...
Clustering analysis is one of multivariate data analysis techniques which allows to gather statis... more Clustering analysis is one of multivariate data analysis techniques which allows to gather statistical data units into groups, in order to minimize the logical distance within each group and to maximize the one between different groups. In these proceedings, the authors present a novel approach to the muontomography data analysis based on clustering algorithms. As a case study we present the Muon Portal project that aims to build and operate a dedicated particle detector for the inspection of harbor containers to hinder the smuggling of nuclear materials. Clustering techniques, working directly on scattering points, help to detect the presence of suspicious items inside the container, acting, as it will be shown, as a filter for a preliminary analysis of the data.
Theoretical predictions as well as experiments performed at storage rings have shown that the lif... more Theoretical predictions as well as experiments performed at storage rings have shown that the lifetimes of β-radionuclides can change significantly as a function of the ionization state. In this paper we describe an innovative approach, based on the use of a compact plasma trap to emulate selected stellar-like conditions. It has been proposed within the PANDORA project (Plasmas for Astrophysics, Nuclear Decay Observation and Radiation for Archaeometry) with the aim to measure, for the first time in plasma, nuclear β-decay rates of radionuclides involved in nuclear-astrophysics processes. To achieve this task, a compact magnetic plasma trap has been designed to reach the needed plasma densities, temperatures, and charge-states distributions. A multi-diagnostic setup will monitor, on-line, the plasma parameters, which will be correlated with the decay rate of the radionuclides. The latter will be measured through the detection of the γ-rays emitted by the excited daughter nuclei follo...
We have ported a parallel version of the Barnes-Hut 3-D N-body tree algorithm under PVM 3.2.5, ad... more We have ported a parallel version of the Barnes-Hut 3-D N-body tree algorithm under PVM 3.2.5, adopting an SPMD paradigm. As in a previous work (Antonuccio-Delogu and Santangelo, 1993), we parallelize the problem by decomposing the physical domain with ...
2013 IEEE International Conference on Technologies for Homeland Security (HST), 2013
ABSTRACT In recent years an increasing interest has grown within the international community towa... more ABSTRACT In recent years an increasing interest has grown within the international community towards the prevention of terroristic threatenings. This traffic requires a broader international control and it becomes necessary to enhance systems for borders security. Currently, muon tomography is under study to be used as an experimental technique to be implemented in devices able to perform an efficient scanning to detect radioactive materials inside different kind of systems, like shipping containers or cargos, for borders control. In this paper the authors will focus on the automated identification and visualization of illicit materials inside cargo containers in the context of the Muon Portal project. The track reconstruction is a challenging task and consists in the elaboration of data from the detector planes in order to obtain information on the deflection occurred by the muons within the volume scanned. Latest results of different reconstruction algorithms, such as the well known POCA and the EM-Likelihood, are presented and discussed together with the novel application of clustering algorithms to the data analysis. The usage of these techniques allows to infer the implicit information in the data and clustering algorithms make the tracks reconstruction and the visualization of the containers content be independent from the grid and the 3D-voxels, acting as a filter for a preliminary analysis of the data.
... The B class supplies the user with a limited amount of CPU time and disk quota, considering t... more ... The B class supplies the user with a limited amount of CPU time and disk quota, considering the user request. ... Astrocomp will be added to the set of the other grid portals in the next future such as Hotpage [13] or Genius [7] and [14]. ...
Monthly Notices of The Royal Astronomical Society, 2002
We use the results of a high-resolution N -body simulation to investigate the role of the environ... more We use the results of a high-resolution N -body simulation to investigate the role of the environment on the formation and evolution of galaxy-sized haloes. Starting from a set of constrained initial conditions, we have produced a final configuration hosting a double cluster in one octant and a large void extending over two octants of the simulation box. In this
... | ChemPort |. 40. Bond, JR, Centrella, J., Szalay, AS & Wilson, JR Mon. Not. ... ... more ... | ChemPort |. 40. Bond, JR, Centrella, J., Szalay, AS & Wilson, JR Mon. Not. ... 45. Dekel, A. in Proc. Eighth Johns Hopkins Workshop on Current Problems in Particle Theory (eds Domokos, G. & Koveski-Domokos, S.) 191−199 (World Publishing, Singapur, 1984). | ChemPort |. 46. ...
Aims. We test the effects of re-orienting jets from an active galactic nucleus (AGN) on the intra... more Aims. We test the effects of re-orienting jets from an active galactic nucleus (AGN) on the intracluster medium in a galaxy cluster environment with short central cooling time. We investigate both the appearance and the properties of the resulting cavities, and the efficiency of the jets in providing near-isotropic heating to the cooling cluster core. Methods. We use numerical simulations to explore four models of AGN jets over several active/inactive cycles. We keep the jet power and duration fixed across the models, varying only the jet re-orientation angle prescription. We track the total energy of the intracluster medium (ICM) in the cluster core over time, and the fraction of the jet energy transferred to the ICM. We pay particular attention to where the energy is deposited. We also generate synthetic X-ray images of the simulated cluster and compare them qualitatively to actual observations. Results. Jets whose re-orientation is minimal (≲20°) typically produce conical structu...
Clustering analysis is one of multivariate data analysis techniques which allows to gather statis... more Clustering analysis is one of multivariate data analysis techniques which allows to gather statistical data units into groups, in order to minimize the logical distance within each group and to maximize the one between different groups. In these proceedings, the authors present a novel approach to the muontomography data analysis based on clustering algorithms. As a case study we present the Muon Portal project that aims to build and operate a dedicated particle detector for the inspection of harbor containers to hinder the smuggling of nuclear materials. Clustering techniques, working directly on scattering points, help to detect the presence of suspicious items inside the container, acting, as it will be shown, as a filter for a preliminary analysis of the data.
Theoretical predictions as well as experiments performed at storage rings have shown that the lif... more Theoretical predictions as well as experiments performed at storage rings have shown that the lifetimes of β-radionuclides can change significantly as a function of the ionization state. In this paper we describe an innovative approach, based on the use of a compact plasma trap to emulate selected stellar-like conditions. It has been proposed within the PANDORA project (Plasmas for Astrophysics, Nuclear Decay Observation and Radiation for Archaeometry) with the aim to measure, for the first time in plasma, nuclear β-decay rates of radionuclides involved in nuclear-astrophysics processes. To achieve this task, a compact magnetic plasma trap has been designed to reach the needed plasma densities, temperatures, and charge-states distributions. A multi-diagnostic setup will monitor, on-line, the plasma parameters, which will be correlated with the decay rate of the radionuclides. The latter will be measured through the detection of the γ-rays emitted by the excited daughter nuclei follo...
We have ported a parallel version of the Barnes-Hut 3-D N-body tree algorithm under PVM 3.2.5, ad... more We have ported a parallel version of the Barnes-Hut 3-D N-body tree algorithm under PVM 3.2.5, adopting an SPMD paradigm. As in a previous work (Antonuccio-Delogu and Santangelo, 1993), we parallelize the problem by decomposing the physical domain with ...
2013 IEEE International Conference on Technologies for Homeland Security (HST), 2013
ABSTRACT In recent years an increasing interest has grown within the international community towa... more ABSTRACT In recent years an increasing interest has grown within the international community towards the prevention of terroristic threatenings. This traffic requires a broader international control and it becomes necessary to enhance systems for borders security. Currently, muon tomography is under study to be used as an experimental technique to be implemented in devices able to perform an efficient scanning to detect radioactive materials inside different kind of systems, like shipping containers or cargos, for borders control. In this paper the authors will focus on the automated identification and visualization of illicit materials inside cargo containers in the context of the Muon Portal project. The track reconstruction is a challenging task and consists in the elaboration of data from the detector planes in order to obtain information on the deflection occurred by the muons within the volume scanned. Latest results of different reconstruction algorithms, such as the well known POCA and the EM-Likelihood, are presented and discussed together with the novel application of clustering algorithms to the data analysis. The usage of these techniques allows to infer the implicit information in the data and clustering algorithms make the tracks reconstruction and the visualization of the containers content be independent from the grid and the 3D-voxels, acting as a filter for a preliminary analysis of the data.
... The B class supplies the user with a limited amount of CPU time and disk quota, considering t... more ... The B class supplies the user with a limited amount of CPU time and disk quota, considering the user request. ... Astrocomp will be added to the set of the other grid portals in the next future such as Hotpage [13] or Genius [7] and [14]. ...
Monthly Notices of The Royal Astronomical Society, 2002
We use the results of a high-resolution N -body simulation to investigate the role of the environ... more We use the results of a high-resolution N -body simulation to investigate the role of the environment on the formation and evolution of galaxy-sized haloes. Starting from a set of constrained initial conditions, we have produced a final configuration hosting a double cluster in one octant and a large void extending over two octants of the simulation box. In this
... | ChemPort |. 40. Bond, JR, Centrella, J., Szalay, AS & Wilson, JR Mon. Not. ... ... more ... | ChemPort |. 40. Bond, JR, Centrella, J., Szalay, AS & Wilson, JR Mon. Not. ... 45. Dekel, A. in Proc. Eighth Johns Hopkins Workshop on Current Problems in Particle Theory (eds Domokos, G. & Koveski-Domokos, S.) 191−199 (World Publishing, Singapur, 1984). | ChemPort |. 46. ...
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