1,720,993 research outputs found
The ISMGEO seismic geotechnical Centrifuge.
No full textThe ISMGEO seismic geotechnical centrifuge (ISGC) is a medium size beam centrifuge, made up of a symmetrical rotating arm with a diameter of 6 m. The centrifuge has the potential of reaching an ac-celeration of 600g at a payload of 4 kN. In 2010 it was equipped with a 1-degree of freedom shaking table. The table works under an acceleration field up to 100g, it can provide excitations at frequencies up to 1000 Hz and acceleration up to 50g and it is able to reproduce real earthquakes at the model scale. The main features of the table and example of applications in two research projects are described in this paper
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
Effects of seismic input, fine crust and existing structure on liquefaction from centrifuge model tests
No full textThe results of dynamic centrifuge tests carried out to study the effects of seismic input, fine crust and existing structure on liquefaction triggering and manifestations are presented. The basic concept of the experimentation was to analyse the seismic behaviour of level ground, saturated, 14 m deep sandy deposits, homogeneous or stratified, subjected to increasing seismic excitations up to liquefaction, with or without a one degree of freedom structure on shallow foundations. The study was performed in the framework of the European project Horizon2020 “LIQUEFACT”
A new, multidisciplinary approach to monitor the health status of free-living fin (Balaenoptera physalus) and sperm (Physeter macrocephalus) whales in the Pelagos Sanctuary, Corsican-Ligurian-Provençal basin
No full textFin and sperm whale Mediterranean populations are classified respectively as vulnerable and endangered in the International Union for Conservation of Nature Red List and potentially threatened by both infectious diseases and anthropogenic factors. Parasites, bacteria, as well as organic and inorganic pollutants, are considered among the main causes of whale’s death or factors predisposing them to other pathologies. To date, most of the investigations on these species have been carried out on stranded and dead whales and performed by necropsy, occasionally providing information on the death causes. Nowadays, data on health status in free-living whales are limited, mainly due to both the difficulty and the high costs of sampling. In order to get information on the health status of fin and sperm whales living in the Pelagos Sanctuary, a preliminary, multidisciplinary study was carried out analysing three faecal samples (2 samples from fin whales and 1 sample from sperm whale) collected with a non-invasive sampling method in the framework of a 30-years long research project on the ecology of these two populations. Each faecal sample underwent parasitological, microbiological and chemical analysis. Results revealed that fin and sperm whales harbour Blastocystis sp., a protozoan parasite with an anthropozoonotic potential, which was never recorded before in these species. Furthermore, a more diverse bacterial community and a higher concentration of heavy metals ( i.e., As, Co, Hg) were found in the sperm whale sample compared to fin whale ones, while the concentration of 16 EPA PAHs and 21 PCBs was <2 ppb in all tested samples. This preliminary study represents the first report of a multidisciplinary approach in live whales investigation, and may provide a baseline for both future monitoring studies on the relationships between health status and anthropogenic pressure, and the development of effective conservation plan for these species in the Mediterranean Sea
Wild whale faecal samples as a proxy of anthropogenic impact
No full textThe occurrence of protozoan parasite, bacterial communities, organic pollutants and heavy metals was investigated in free-ranging species of fin (Balaenoptera physalus, n. 2) and sperm (Physeter macrocephalus, n. 2) whales from the Pelagos Sanctuary, Corsican-Ligurian Provencal Basin (Northern-Western Mediterranean Sea). Out of four faecal samples investigated, two from fin whales and one from sperm whale were found positive to Blastocystis sp. A higher number of sequences related to Synergistetes and Spirochaetae were found in sperm whales if compared with fin whales. Moreover, As, Co and Hg were found exclusively in sperm whale faecal samples, while Pb was found only in fin whale faecal samples. The concentration of both PAH and PCB was always below the limit of detection. This is the first report in which the presence of these opportunistic pathogens, bacteria and chemical pollutants have been investigated in faecal samples of free-ranging whale species and the first record of Blastocystis in fin and sperm whales. Thus, this study may provide baseline data on new anthropozoonotic parasite, bacterial records and heavy metals in free-ranging fin and sperm whales, probably as a result of an increasing anthropogenic activity. This survey calls for more integrated research to perform regular monitoring programs supported by national and/or international authorities responsible for preservation of these still vulnerable and threatened whale species in the Mediterranean Sea
Social kin associations and genetic structuring of striped dolphin populations (Stenella coeruleoalba) in the Mediterranean Sea
No full textBiological consequences of global warming: does sea surface temperature affect cetacean distribution in the Western Ligurian sea?
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