Search results for "beam"
showing 10 items of 2126 documents
Multibeam Sonar System for Detecting Seabed Features
2010
Discriminating between Posidonia oceanica meadows and sand substratum using multibeam sonar
2010
Abstract Di Maida, G., Tomasello, A., Luzzu, F., Scannavino, A., Pirrotta, M., Orestano, C., and Calvo, S. 2011. Discriminating between Posidonia oceanica meadows and sand substratum using multibeam sonar. – ICES Journal of Marine Science, 68: 12–19. High-resolution, multibeam sonar (MBS) (455 kHz) was used to identify two typologies of seabed 8 m deep: Posidonia oceanica meadow and sandy substratum. The results showed that the heterogeneity of the architecture of the P. oceanica canopy and the relatively simple morphology of a sandy substratum can be detected easily by statistical indices such as standard deviation or range-of-beam depth. Based on these indices, an automated classification…
Un sistema integrato per ottimizzare le operazioni di monitoraggio e verità-mare
2008
Estimating Posidonia oceanica shoot length by using Multibeam Sonar System
2010
Uso del Sistema Sonar Multi-Beam (MBSS) per la cartografia delle comunità bentoniche
2008
High-energy radiation process, a "facile" and "versatile" approach to obtain PVP-graft- AA nanogels
2012
Poly(N-vinylpyrrolidone)-grafted-acrylic acid biocompatible nanogels (NGs) were prepared using an exiting industrial-type electron accelerator and setups, starting from semi-dilute aqueous solutions of a commercial PVP and the acrylic acid monomer. As a result, NGs with tunable size and structure can be obtained quantitatively. Sterility was also imparted at the integrated dose absorbed. The chemical structure of the NGs produced was confirmed through Fourier Transformer Infrared Spectroscopy (FT-IR). The molecular and physico-chemical properties of NGs, such as the hydrodynamic dimensions and surface charge densities, for various polymer and monomer concentrations in the irradiated solutio…
Electron Spin Resonance (ESR) characterization of phenol compounds as new materials for dosimetry in radiotherapy
2016
Among the various dosimetric techniques used for characterizing the radiation beams used in radiation therapy, the electron spin resonance (ESR) arouses increasing interest for applications in various therapy procedures [1]. Free radicals are known to be produced when a compound is irradiated with ionizing radiations. The concentration of radiation-induced free radicals is proportional to the absorbed dos e and this allows for dosimetric measurements through ESR technique which able to quantitatively determine the radical concentration [2]. Our research group has started an investigation of the ESR response of some phenols compounds for possible ESR dosimetric ap plications suitable feature…
Phenol compounds as new materials for Electron Paramagnetic Resonance dosimetry in clinical photon and electron beams,
2016
In the last decades several research laboratories have shown an increasing interest aimed at extending the applicability of Electron Paramagnetic Resonance (EPR) dosimetry to radiotherapy with different types of radiation beams. EPR is a spectroscopic method for investigating the structure and dynamics of such paramagnetic species. Free radicals are known to be produced when a compound is irradiated with ionizing radiations. The concentration of radiation-induced free radicals is proportional to the energy released inside in the medium and this allows for dosimetric measurements through EPR technique. The use of alanine as a dosimetric material gave the possibility to apply EPR spectroscopy…
A scenario-based assessment of the tsunami hazard in palermo, northern sicily, and the southern tyrrhenian sea
2020
Palermo is a populous city situated on the northern coast of Sicily, bordered by the Tyrrhenian Sea. This central part of the Mediterranean Sea features dramatic bathymetry, numerous subaqueous landslides and is also the epicentre to many subaqueous earthquakes. As such, the region is an area prone to tsunamis. This investigation uses the Cornell Multi-Grid Coupled Tsunami (COMCOT) tsunami modelling package to simulate five near-field landslides, and five near-field earthquakes regarded as worst-case credible scenarios for Palermo. The seismic simulations produced waves on a very small scale, the largest being c. 5 cm at its maximum height, and none of the earthquake-generated tsunami waves…
A proposal for improving the elastic behaviour of dogbone
2022
The Reduced Beam Section (RBS) connections are one of the prequalified connections approved by international standards and adopted to improve the seismic behaviour of steel Moment Resisting Frames (MRF) also protecting the joint between beams and columns. This goal is reached by locally reducing the resistance of a selected portion of the beam element by suitably trimming the flanges, to promote in that portion the onset of plastic deformations. In the framework of RBS, the most important typology proposed is the so-called dogbone (DB) connections that are widely diffused in seismic engineering. The essential advantages of DB are related to the protection of the welded cross section between…