165 research outputs found
R&D on co-working transport schemes in Geant4
A research and development (R&D) project related to the extension of the
Geant4 toolkit has been recently launched to address fundamental methods in
radiation transport simulation. The project focuses on simulation at different
scales in the same experimental environment; this problem requires new methods
across the current boundaries of condensed-random-walk and discrete transport
schemes. The new developments have been motivated by experimental requirements
in various domains, including nanodosimetry, astronomy and detector
developments for high energy physics applications.Comment: To be published in the Proceedings of the CHEP (Computing in High
Energy Physics) 2009 conferenc
Research in Geant4 electromagnetic physics design, and its effects on computational performance and quality assurance
The Geant4 toolkit offers a rich variety of electromagnetic physics models;
so far the evaluation of this Geant4 domain has been mostly focused on its
physics functionality, while the features of its design and their impact on
simulation accuracy, computational performance and facilities for verification
and validation have not been the object of comparable attention yet, despite
the critical role they play in many experimental applications. A new project is
in progress to study the application of new design concepts and software
techniques in Geant4 electromagnetic physics, and to evaluate how they can
improve on the current simulation capabilities. The application of a
policy-based class design is investigated as a means to achieve the objective
of granular decomposition of processes; this design technique offers various
advantages in terms of flexibility of configuration and computational
performance. The current Geant4 physics models have been re-implemented
according to the new design as a pilot project. The main features of the new
design and first results of performance improvement and testing simplification
are presented; they are relevant to many Geant4 applications, where
computational speed and the containment of resources invested in simulation
production and quality assurance play a critical role.Comment: 4 pages, 4 figures and images, to appear in proceedings of the
Nuclear Science Symposium and Medical Imaging Conference 2009, Orland
Geant4-related R&D for new particle transport methods
A R&D project has been launched in 2009 to address fundamental methods in
radiation transport simulation and revisit Geant4 kernel design to cope with
new experimental requirements. The project focuses on simulation at different
scales in the same experimental environment: this set of problems requires new
methods across the current boundaries of condensed-random-walk and discrete
transport schemes. An exploration is also foreseen about exploiting and
extending already existing Geant4 features to apply Monte Carlo and
deterministic transport methods in the same simulation environment. An overview
of this new R&D associated with Geant4 is presented, together with the first
developments in progress.Comment: 4 pages, to appear in proceedings of the Nuclear Science Symposium
and Medical Imaging Conference 2009, Orland
New models for PIXE simulation with Geant4
Particle induced X-ray emission (PIXE) is a physical effect that is not yet
adequately modelled in Geant4. The current status as in Geant4 9.2 release is
reviewed and new developments are described. The capabilities of the software
prototype are illustrated in application to the shielding of the X-ray
detectors of the eROSITA telescope on the upcoming Spectrum-X-Gamma space
mission.Comment: To be published in the Proceedings of the CHEP (Computing in High
Energy Physics) 2009 conferenc
Inter-Comparison and Validation of Geant4 Photon Interaction Models
A R&D project, named Nano5, has been recently launched to study an
architectural design in view of addressing new experimental issues related to
particle transport in high energy physics and other related physics disciplines
with Geant4. In this frame, the first step has involved the redesign of the
photon interaction models currently available in Geant4; this task has
motivated a thorough investigation of the physics and computational features of
these models, whose first results are presented here.Comment: 4 pages, 7 figures and images, 2 tables, to appear in proceedings of
the Nuclear Science Symposium and Medical Imaging Conference 2009, Orland
Design and performance evaluations of generic programming techniques in a R&D prototype of Geant4 physics
A R&D project has been recently launched to investigate Geant4 architectural
design in view of addressing new experimental issues in HEP and other related
physics disciplines. In the context of this project the use of generic
programming techniques besides the conventional object oriented is
investigated. Software design features and preliminary results from a new
prototype implementation of Geant4 electromagnetic physics are illustrated.
Performance evaluations are presented. Issues related to quality assurance in
Geant4 physics modelling are discussed.Comment: To be published in the Proceedings of the CHEP (Computing in High
Energy Physics) 2009 conferenc
Disturbances in a VLF radio signal prior the M =4.7 offshore Anzio (central Italy) earthquake on 22 August 2005
Abstract. On 22 August 2005 an earthquake with magnitude M=4.7 occurred in the Anzio (central Italy) offshore area. From 2002, a VLF-LF radio receiver is into operation in Bari (southern Italy). The intensity and the phase of the signals transmitted by GB (f=16 kHz, United Kingdom), FR (f=20.9 kHz, France), GE (f=23.4 kHz, Germany), IC (f=37.5 kHz, Island) and IT (f=54 kHz, Sicily, Italy) has been monitored with a 5 s sampling rate. The previous epicenter is near enough to some of the radio paths and the data collected were studied in order to reveal possible seismic effects. The raw analysis revealed a clear drop in the intensity of the FR radio signal on 19 August. Then the wavelet analysis was applied to the intensity and the phase data of the different radio signals. In the mentioned day an increase in the band 60–120 min was revealed in the spectra of the FR signal. Then the principal component analysis was applied and again the 19 August stood up as an anomalous day for the FR radio signal. The path of this signal, among the paths of the five radio signals collected by the Bari receiver, is the nearest to the mentioned epicentre and the anomaly revealed on 19 August appears as a precursor of the earthquake. This result confirms the possible precursor revealed by other researchers in the air Rn content in a site located 5 miles far from the epicenter
Ionisation Models for Nano-Scale Simulation
Two theory-driven models of electron ionization cross sections, the
Binary-Encounter-Bethe model and the Deutsch-M\"ark model, have been design and
implemented; they are intended to extend the simulation capabilities of the
Geant4 toolkit. The resulting values, along with the cross sections included in
the EEDL data library, have been compared to an extensive set of experimental
data, covering more than 50 elements over the whole periodic table.Comment: 4 pages, to appear in proceedings of the Nuclear Science Symposium
and Medical Imaging Conference 2010, Knoxvill
Anipemza village’s adaptive reuse design
This Fifth Chapter presents the adopted methodology and the results of the Adaptive Reuse Design that, starting from the outline of a social-oriented System Design Masterplan and the priority list of suggested operations is dedicated
to the presentation of the case-studies that compose the mosaic of those interventions needed to build a possible social and economic reactivation strategy of Anipemza.
Five case-studies for five different existing buildings will in fact virtuously match the user needs of locals and visitors alike, following preservation priorities to pursue the conservation of the integrity and the authenticity of the pre-existences, a minimum intervention approach and contemporary interventions identity’s awareness. The
aimed attraction of a larger number of tourists into the discovery of the architectural, but most importantly the human qualities of the village will endorse decisive new social relationships as long as the village micro-economy reactivation, thus endorsing the future itself of this community, the historical memories and the architectural palimpsest. In this sense the Adaptive Reuse Design is intended as the final stage of the Conservation Process
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