Search results for "Zona"
showing 10 items of 408 documents
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…
Seismic Characterization by Inversion of HVSR Data to Improve Geological Modelling
2014
SUMMARY An application of HVSR inversion is presented in order to verify the effectiveness of this technique for purposes of geological reconstruction of the subsoil finalized to studies of seismic microzonation of heavily urbanized areas, where few stratigraphic and geophysical constraints are available and most of the information are derived from the geological maps. In such cases the uncertainty of the results is is enhanced by doubts on the nature of the H/V peaks, not always caused by stratigraphic discontinuities, and to the subjective choices done especially in the step of signal preprocessing. The investigated area (Altavilla Milicia, Sicily) includes the town center and the adjacen…
El Paseo de la Alameda de Valencia. Historia urbana de un espacio para la recreación pública (1644-1994)
1994
Meridional gradients of light absorbing carbon over northern Europe
2008
In situ measurements have been made in the upper troposphere of the properties of particles containing light absorbing carbon (LAC). These measurements, made in late November 2006 over northern Europe, show that the average LAC mass concentration varies between 1 and 5 ng m−3 over a latitude range 50° to 70°N, with maxima at 50° and 66°. The relative fraction of all particles larger than 0.1 µm that contain LAC decreases at higher latitudes. The derived extinction coefficient, which also increases with latitude, reaches a maximum of 1.4 Mm−1 at 66°. The air mass histories associated with the LAC were evaluated with back trajectory analysis using wind field analysis from the European Center …
Rīcībpolitikas pārcelšana: Eiropas Ekonomikas zonas finanšu instrumenta gadījums
2015
Eiropas Ekonomikas zonas finanšu instrumenta mērķis ir sociālās un ekonomiskās nevienlīdzības mazināšana. Pētījumā apskatīti divu plānošanas periodu 2004.-2009 un 2009.- 2014 ietvaros īstenotie prioritārie virzieni, noteikta finansējuma piešķiršanas lietderība, veikta periodu analīze, kā arī sniegts pamatojums finansējuma turpmākai piešķiršanai. Pētījumā norādītie dati liecina par esošās situācijas uzlabojumiem, ļaujot noteikt prioritāros virzienus nākošo plānošanas periodu izstrādē. Maģistra darba centrālā problēma tiek ietverta darba hipotēzē - Rīcībpolitikas pārnesi Eiropas Ekonomikas zonas finanšu instrumenta kultūras programmu gadījumā regulē donorvalstu Norvēģijas, Lihtenšteinas un Is…
Sistemātisks mikroplastmasas monitorings saldūdens ekosistēmā mikroplastmasas piesārņojuma un tā sezonālās dinamikas izvērtēšanai
2020
Darbā veikta ar mikroplastmasu saistītās literatūras izskatīšana, pievēršot lielāku uzmanību pētījumiem par mikroplastmasu saldūdens sistēmās. Tika veikta sezonāla Mazā Baltezera mikroplastmasas piesārņojuma noteikšana, periodiski palageāli ievācot paraugus. Veikta paraugu attīrīšanu no piemaisījumiem. Mikroplastmasas noteikšana tika veikta ar FTIR-ATR metodi. Izvirzītā hipotēze – sezonalitātei ir būtiska ietekme uz konstatēto mikroplastmasas daudzumu un polimēru veidu.
Enseñanza de las ciencias : revista de investigación y experiencias didácticas
2021
La biodiversidad es un concepto complejo, convertido en un importante referente curricular. Esta investigación explora si un ejercicio avanzado de las competencias necesarias para hacer significativo el concepto de biodiversidad en diferentes contextos conlleva una mejora significativa de la calidad de los argumentos implicados en la toma de decisiones sobre conservación de la biodiversidad. Para ello se ha aplicado una metodología cualitativa al análisis de doce argumentos formulados por estudiantes de 1.º de Bachillerato, caracterizados por su elevada complejidad estructural, de los cuales se muestra uno a modo de ejemplo. Los resultados revelan que, a pesar del nivel de cohesión estructu…
Tres medios sedimentarios actuales en el Mediterráneo
1983
The integration of surface and subsurface stratigraphic data with HVSR measures for studies of seismic microzonation: the case of Oliveri (ME)
2013
Because of its high seismic hazard the urban area of Oliveri has been subject of a study on seismic microzonation at first level (OPCM 3907/2010). The urban area develops on a large coastal plain made of Late Pleistocene and Holocene mixed fluvial/marine sediments, that mainly consist of silty sands and gravels. The eastern part of this plain is dominated by the alluvial deposits of the Elicona torrent. The coastal and alluvial sediments overlap a complexly deformed substrate made of Hercynian metamorphites (Aspromonte unit), the Capo d’Orlando Flysch, the Antisicilide Argille Scagliose and Pleistocene clays and calcarenites. This area is affected by high uplift rates as recently estimated …