Search results for "EOF"

Hydrography and food distribution during a tidal cycle above a cold-water coral mound

2022

Cold-water corals (CWCs) are important ecosystem engineers in the deep sea that provide habitat for numerous species and can form large coral mounds. These mounds influence surrounding currents and induce distinct hy- drodynamic features, such as internal waves and episodic downwelling events that accelerate transport of organic matter towards the mounds, supplying the corals with food. To date, research on organic matter distribution at coral mounds has focussed either on seasonal timescales or has provided single point snapshots. Data on food distribution at the timescale of a diurnal tidal cycle is currently limited. Here, we integrate physical, biogeochemical, and biological data throug…

The Sonic Imprint to identify and monitor precious artefacts: further developments

2008

A new non-invasive technique, developed to univocally identify and monitor the integrity of precious artefacts, like potteries, statues and objects, generally made of stone, metal or wood, has been already presented (2). This technique responds to the demand, especially felt among museum managers, of an art collection cataloguing which allows the identification of artefacts and the assessment of their physical conditions. This is also linked to the international loan of precious artefacts, which are then subjected to transport stresses and to the connected risks (damages, substitutions, physical deterioration, etc.). Furthermore, in these days many art exhibitions are itinerant, and the art…

253. La pandemia y el Geoforo Iberoamericano en 2020

2021

La pandemia de la COVID-19, que nos afecta desde los primeros meses de 2020, ha modificado nuestras costumbres y rutinas. Y también la manera de relacionarnos en los medios escolares y universitarios. Desde el Geoforo Iberoamericano sobre Educación, Geografía y Sociedad hemos considerado que se abría una oportunidad para re-pensar los problemas sociales y ambientales que condicionan nuestra cotidianidad. Desde el estudio de situaciones particulares hemos querido definir los problemas intelectuales que sean susceptibles de ser trabajados en las aulas. Esta consideración es fruto de la evolución que venimos manteniendo desde 2008 y que se valoró en el Coloquio de 2019 en Bogotá, del cual tamb…

Improvement of HVSR technique by cluster analysis

2013

The Horizontal to Vertical Spectral Ratio (HVSR) technique, applied to ambient noise, is widely used to quickly estimate the fundamental frequency of a site. The HVSR technique is based on numerous assumptions about the propagation medium and the nature of the seismic noise, often hard to verified. In addition, in order to obtain reliable results, several acquisition and processing criteria must be respected. One of the most controversial aspects in the technique implementation are the reliable criteria for the identification in the microtremors signals of time windows appropriate for the calculation of the HVSR curves. Several authors suggest to remove spikes and transients because they br…

Rete Sismica Nazionale e sua performance di localizzazione: una valutazione tramite il metodo SNES

2010

Low-cost remotely operated underwater and unmanned aerial vehicles: New technologies for archaeo-geophysics

2017

In this paper we present a device for magnetic survey devoted in particular for archaeological purposes. The device is able to perform accurate measurements of the total magnetic field, it is a flexible device, programmable by the users to be suitable for any specific need. The device relies upon microcontroller, a digital three axes Fluxgate magnetometer, a GPS, and a Real Time Clock (RTC) module. The device is compact and lightweight to be assembled on aerial and marine drones. Recently, Remotely Operated Vehicles (ROV) and Unmanned Aerial Vehicles (UAV) gained great potential for archaeo-geophysics because of their versatility and low cost, therefore the magnetometer represents a very us…

Centroid-based Cluster Analysis of HVSR Data for Seismic Microzonation

2014

Horizontal to Vertical Spectral Ratio (HVSR) datasets acquired for studies of seismic microzoning in various urban centers of Sicilian towns, have been used to test clustering analysis through a nonhierarchical centroid-based algorithm. In this context clustering techniques may be useful to identify areas with similar seismic behaviour through HVSR data. Centroid-based algorithms generally require the number of clusters, k, and the initial centroid coordinates to be specified in advance. This aspect is considered to be one of the biggest drawbacks of these algorithms. The proposed algorithm doesn’t limit the number of k clusters and choose the initial centroids automatically from the data s…

A specific operative protocol set up during the restoration of the Grammichele's slate slab

2009

Palermo 2010 - Campagna di monitoraggio sismo-acustico sottomarino dell’area epicentrale del terremoto di Palermo del 6 settembre 2002

2010

Numerical and experimental analysis of a high innovative hydrofoil

2020

The hydrofoil is a craft where the weight is entirely supported by the lift generated by the submerged part of wings. The particular structure of the craft requires a thorough study of the architecture of the hull, whose structure differs from others high speed vessels since the lift on wing surfaces are transmitted to the hull in limited areas (wing attacks). The authors have developed a research to optimize geometry of hull and wing system on a hydrofoil capable to carry 250 passengers at a speed of 35 knots, operating among Sicilian island. The principal goals of the new hydrofoil concern both the fuel reduction that the improvement of the comfort in terms of seakeeping and levels of aco…