Search results for "HQ"
showing 10 items of 276 documents
Widening the scope of comparative political theory
2014
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 …
Characterization of MEMS accelerometer self-noise by means of PSD and Allan Variance analysis
2017
In this paper, we have studied the sources of error of a low-cost 3-axis MEMS accelerometer by means of Power Spectral Density and Allan Variance techniques. These techniques were applied to the signals acquired from ten identical devices to characterize the variability of the sensor produced by the same manufacturer. Our analysis showed as identically produced accelerometer have somehow variable behavior in particular at low frequency. It is therefore of paramount importance before their use in Inertial Navigation or Earthquakes Monitoring System, a complete characterization of each single sensors.
The tsunami phenomenon
2017
Abstract With human activity increasingly concentrating on coasts, tsunamis (from Japanese tsu = harbour, nami = wave) are a major natural hazard to today’s society. Stimulated by disastrous tsunami impacts in recent years, for instance in south-east Asia (2004) or in Japan (2011), tsunami science has significantly flourished, which has brought great advances in hazard assessment and mitigation plans. Based on tsunami research of the last decades, this paper provides a thorough treatise on the tsunami phenomenon from a geoscientific point of view. Starting with the wave features, tsunamis are introduced as long shallow water waves or wave trains crossing entire oceans without major energy l…
Semi-decentralized strategies in structural vibration control
2011
Published version of an article published in the journal: Modeling, Identification and Control. Also available from the publisher at: http://dx.doi.org/10.4173/mic.2011.2.2 In this work, the main ideas involved in the design of overlapping and multi-overlapping controllers via the Inclusion Principle are discussed and illustrated in the context of the Structural Vibration Control of tall buildings under seismic excitation. A detailed theoretical background on the Inclusion Principle and the design of overlapping controllers is provided. Overlapping and multi-overlapping LQR controllers are designed for a simplied five-story building model. Numerical simulations are conducted to asses the pe…
Comunicació 2.0 i gènere
2009
Internet ha capgirat les formes de comunicació i d’intercanvi d’informació entre les persones: les receptores en el procés comunicatiu són ara també emissores. La conjunció d’aquesta particularitat amb l’aparició i ús d’algunes eines de comunicació (fàcils d’usar i bàsicament gratuïtes) permet parlar d’un fenomen social de gran abast: la comunicació 2.0. Aquest article analitza algunes de les característiques d’aquesta classe d’interacció i centra l’interés de forma particular en certes iniciatives que tenen com a epicentre les qüestions de gènere. La comunicació 2.0 permet la participació activa i directa en el procés, obert i col·laboratiu, de construcció de la identitat pròpia. Així mate…
Late Hercynian Plate and Intraplate Processes within Europe
1987
The Hercynian orogenic belt of Europe consists of a central crystalline ridge which is accompanied on both sides by a rather unmetamorphosed foldbelt. It is speculated that the crystalline ridge represents some kind of island arc system underlain by a segment of continental crust. On both sides this island arc system was involved in subduction of oceanic crust, first of the Mideuropean Sea in the North and then of the Paleotethys in the South. When the continental areas to the north and south of the oceanic areas (North America/Northern Europe and Africa) finally got involved in the subduction processes, continent/continent collision took place on both sides of the island arc system. The tw…
Escritura y ciudad en María Zambrano : reencuentro de una amistad perdida tras la derrota sufrida
2015
En este trabajo abordamos la reflexión que sobre el acto del escribir y la escritura realiza María Zambrano en sus escritos "Del escribir" y "Por qué se escribe", para relacionarlos con uno de los espacios más importantes para la pensadora: la ciudad. Aunque Zambrano no desarrolló una "teoría" sobre la ciudad propiamente dicha, su significado e imagen se encuentran en gran parte de su obra. La escritura, como logos que existe físicamente en el mundo, construye la ciudad: ese lugar de la palabra y de la libre expresión que nos protege. Una ciudad que parece derrotada ante la desaparición del pensamiento creativo, no instrumental, en el espacio público y que exige su reencuentro.
Waveforms clustering and single-station location of microearthquake multiplets recorded in the northern Sicilian offshore region
2013
In 2009 December, the OBSLab-INGV (Istituto Nazionale di Geofisica e Vulcanologia) deployed an Ocean Bottom Seismometer with Hydrophone (OBS/H) near the epicentral area of the main shock of the Palermo seismic sequence of 2002. The monitoring activity had a total duration of about 8 months. During this experiment, the OBS/H recorded 247 very local microearthquakes, whose local magnitude is between -0.5 and 2.5 and TS - TP delay time between 0.2 and 5 s, almost all ofwhichwere undetected by the Italian National Seismic Network. This local microseismicity has been analysed using an innovative clustering technique that exploits the similarity between the waveforms generated by different events…
Mujer y Verdad: Notas sobre la historicidad de la 'diferencia de los sexos'.
2000
En este artículo, la autora se propone analizar algunos textos de la historia de la filosofía en los que se relaciona 'mujer' y 'verdad' y 'mujer' y 'filosofía'. La enigmática afirmación de F. Nietzsche, en La Gaya Ciencia, 'La Verdad es una Mujer' le sirve como punto de partida para abordar. 1.- parte de 'la diferencia de los sexos' como un objeto no definido pero del que hay que indagar su historicidad. 2.-Ello servirá de base para interpretar algunos de los ensayos de M. Montaigne y de F. Schlegel como diferentes modelos histórico-filosóficos de la relación verdad-mujer. 3.- El análisis se hace en torno a la relación: 'prejuicios-verdad e igualdad sexual', en el caso de Montaigne y en to…