1,721,006 research outputs found
Seismic history of the Maltese islands and considerations on seismic risk
No full textA historical catalogue of felt earthquakes in the Maltese islands has been compiled dating back to 1530. Although
no fatalities were officially recorded during this time as a direct consequence of earthquake effects, serious
damage to buildings occurred several times. In the catalogue time period, the islands experienced EMS-98
intensity VII-VIII once (11 January 1693) and intensity VII, or VI-VII five times. The northern segment of the
Hyblean-Malta plateau is the source region which appears to pose the greatest threat, although large Greek
events and lower magnitude Sicily Channel events also produced damage. Estimates of return periods for intensity
≥V are presented, and it is shown that expected peak ground accelerations justify the implementation of, at
least, minimum anti-seismic provisions. The rapid and continual increase in the local building stock on the
densely-populated islands warrants the implementation of an appropriate seismic building code to be enforced.JCR Journalope
A single-station automated earthquake location system at Wied Dalam Station, Malta
No full textThe seismicity of the Sicily Channel, bordered by the Sicilian, Tunisian, and Libyan coastlines, is mainly controlled by active faults of the Sicily Channel rift zone (SCRZ). This region is characterized by a moderate level of earthquake activity with magnitudes generally below 5.0. However, most seismicity, especially south of the Maltese islands, has, to date, either gone unreported or been poorly located owing to difficulties in instrumental coverage. Since many earthquakes are recorded only on a single station on Malta (broadband station WDD), it was deemed necessary to develop a routine procedure for detecting and locating earthquakes using three-component polarization analysis. Such a system, nicknamed LESSLA (Local Earthquake Single-Station Location Analyser) has been successfully implemented since 2005. It uses an automated method of recognizing local/regional events based on a weighting scheme applied to triggers in different sampling streams. LESSLA has allowed a lower detection threshold for earthquakes in the Sicily Channel, and as a result provided new insights into the pattern of seismicity on the rift zone. LESSLA has also had a good success rate at rapidly and accurately reporting larger events as far as the Greek subduction zone. The description, performance, and limitations of the system are here discussed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Investigation of cliff instability at Għajn Ħadid Tower (Selmun Promontory, Malta) by integrated passive seismic techniques
No full textGħajn Ħadid Tower represents an important cultural heritage of Malta (Central Mediterranean Sea). This tower, built in 1658 on the Selmun Promontory on the northeast coast of the island, was severely damaged by the 1856 Crete earthquake (MW 7.7). The area where the tower ruins stand is involved in a significant landslide process of lateral spreading. During 2015 and 2016, engineering geological surveys and passive seismic measurements were carried out to evaluate the main resonance frequencies of the promontory and monitor the gravity-induced instability process. Seismic ambient noise measurements in the area of the tower show significant horizontal-to-vertical spectral ratio (HVSR) resonance peaks at 3.3–3.5 Hz characterized by linearity and polarization of the particle motion. These features are not present in the measurements carried out on the stable zone and can be related to the vibrational behaviour of the unstable rock block. Additionally, a shear wave velocity profile for the area was obtained by using a seismic array. At the same time, two different approaches were tested for monitoring the landslide process: (i) a Seismic Navigating System (SNS) array detected 20 natural microseismic events caused by the ongoing landslide process; (ii) few-days continuous seismic noise measurements on the unstable rock block were used to carry out a preliminary study of the variation of specific parameters over time
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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