Search results for "HQ"
showing 10 items of 276 documents
Fluid-triggered earthquake swarms in the Rwenzori region, East African Rift—Evidence for rift initiation
2012
The Rwenzori Mountains are located within the Albertine Rift Valley in western Uganda. To monitor the microseismic activity in the area we have deployed a seismic network of up to 35 stations for a period of about 20 months. The analysis of the recordings revealed several earthquake clusters within a restricted area NE of the mountain block. The clusters form elongated pipes with 1–2 km diameter and vertical extensions of 3–5 km. Most of them are located in 5–16 km depths; however one cluster reaches down to 22 km. Each cluster is composed of a series of single earthquake swarms with durations between a few days and more than a week, interrupted by intervals of inactivity of up to several m…
Ethics of restoration and conservation science: the completion and reuse of the former Mother Church in Santa Margherita di Belice (Sicily) / Ética d…
2016
Restaurare l’architettura significa conservare la sua essenza autentica e le stratificazioni storiche, rispettare il criterio della distinguibilità e attualizzare le funzioni che racchiude. Questo moderno indirizzo culturale e metodologico ha sostanziato il progetto di restauro e di rifunzionalizzazione della ex chiesa madre di Santa Margherita di Belice, in Sicilia, che oggi ospita il “Museo della Memoria”. L’istinto progettuale conservativo si è manifestato fin dalle prime ipotesi d’intervento, quando è stata rigettata la possibilità di riproporre “nuovamente” le masse murarie del monumento, sconquassate da un violento terremoto nel 1968. Si è scelto, infatti, d’attuare un’operazione raff…
(Di)segni contemporanei
2018
Il contributo intende presentare criticamente alcuni interventi di restauro allineati alla più moderna ed evoluta cultura della conservazione. I due interventi sono compiuti in Sicilia sui resti di due monumenti distrutti dal terremoto che danneggiò la vallata del fiume Belice nel 1968. Il tema della reintegrazione della lacuna nei volumi strutturali degli edifici storici è realizzata attraverso il procedimento per "astrazione volumetrica", con esiti sorprendenti e d'elevata qualità conservativa. The contribution intends to critically present some restoration interventions aligned with the most modern and evolved culture of conservation. The two interventions are carried out in Sicily on th…
IMRR and IMPR Routing Protocols For Inter and Intra Wireless Mesh Communications
2015
Given the evolution of wireless technologies, Wireless Mesh Networks (WMN) have appeared as an emerging low-cost solution to ensure last-mile connectivity to the Internet network. However, providing real-time and streaming applications, such as VoIP (Voice over IP) and VoD (Video on Demand), with a satisfying QoS level is considered as an important challenge within these networks. In this paper, we propose a QoS based routing protocol, called Hybrid QoS Mesh Routing (HQMR), jointly with a clustering algorithm to improve the scalability of mesh networks. HQMR is composed of two routing sub- protocols: a reactive QoS based routing protocol for intra-mesh infrastructure communications and a pr…
Crítica, sabotaje y subalternidad
2013
Este ensayo define un “nuevo” concepto de crítica denominado “crítica como sabotaje”, su necesidad en el contexto de la posglobalización y sus puntos de referencia. Para ello, introduce una definición de la textualidad como fuerza performativa real que modeliza la visión del mundo de los receptores y les incita a llevar a cabo actos y discursos. Asimismo, ilustra la “crítica como sabotaje” mediante unos breves ejemplos pertenecientes a diferentes registros semióticos.
A fast and efficient picking algorithm for earthquake early warning application based on the variance piecewise constant models
2020
An earthquake warning system, or earthquake early warning system, is a system of accelerometers, seismometers, communication, computers, and alarms that is devised for notifying adjoining regions of a substantial earthquake while it is in progress. This is not the same as earthquake prediction, which is currently incapable of producing decisive event warnings. The implementation of efficient and computationally simple picking algorithm is necessary for this purpose, as well as automatic picking of seismic phases for seismic surveillance and routine earthquake location for fast hypocenter determination. In this paper a method for picking based on the detection of signals changes in variance …
Time-Frequency Filtering for Seismic Waves Clustering
2014
This paper introduces a new technique for clustering seismic events based on processing, in time-frequency domain, the waveforms recorded by seismographs. The detection of clusters of waveforms is performed by a k-means like algorithm which analyzes, at each iteration, the time-frequency content of the signals in order to optimally remove the non discriminant components which should compromise the grouping of waveforms. This step is followed by the allocation and by the computation of the cluster centroids on the basis of the filtered signals. The effectiveness of the method is shown on a real dataset of seismic waveforms.
Monochromatic Long-Period Seismicity Prior to the 2012 Earthquake Swarm at Little Sitkin Volcano, Alaska
2021
Detection of the earliest stages of unrest is one of the most challenging and yet critically needed aspects of volcano monitoring. We investigate a sequence of five unusual long-period (LP) earthquakes that occurred in the days prior to the onset of a months-long volcano-tectonic (VT) earthquake swarm beneath Little Sitkin volcano in the Aleutian Islands during late 2012. The long-period earthquakes had two distinctive characteristics: their signals were dominated by a monochromatic spectral peak at approximately 0.57 Hz and they had impulsive P and S-wave arrivals on a seismometer located on Amchitka Island 80 km to the southeast of the volcano. In each case, the monochromatic earthquakes …
Childhood exposure to parental alienation practices: a socio-educational analysis
2020
Abstract: Objective. To carry out a study about family alienation practices and the extent to which they affect minors as they are exposed to such practices. Methodology. A qualitative research approach is used. In order to conduct this research, a case study made up of five families who attend the Specialised Family and Infancy Service in Spain was carried out. Results and conclusions. The obtained results revealed the high degree of effect on the family members who made up the sample due to the conflicts that legal separation or divorce procedures cause. It is important to ensure that the fundamental right of minors are suitably related to both their mothers and fathers by maintaining all…
Seismotectonics of the active thrust front in southwestern Sicily: hints on the Belice and Selinunte seismogenic sources
2014
We present a seismotectonic model of the active thrust front in western Sicily, which includes the area hit by the 1968 Belice earthquake sequence. The ~40 km long South-WEstern Sicilian Thrust (SWEST) is formed by two aligned albeit non-parallel fault arrays, the Granitola-Castelevetrano Thrust System (GCTS) in the west and the Partanna- Poggioreale Thrust System (PPTS) in the east. The ~NE-SW trending, NW-dipping GCTS straddles from the Pelagian coastline to Castelvetrano, is ~18 km long and composed of two segments, with the northern, ~12 km long one showing geodetic and geologic evidence of active deformation (Barreca et al., 2014). The segment is marked by a sharp gradient in Different…