1,721,019 research outputs found
The biomonitoring approach as a tool of trace metal assessment in an uncontaminated marine ecosystem: the island of Ustica (Sicily, Italy).
No full textInfluence of weight on the content of heavy metals in tissues of Mytilus galloprovincialis (Lamarck 1819): a forecast model.
No full textMultiple Access Design for Impulse Radio Communication Systems
No full textNew York, USA
In this paper, we address the problem of designing time hopping codes for impulse radio multiple access communication systems. Time hopping techniques are first reviewed, including a new code that we proposed [2] for time hopping, and performance in terms of cyclic correlation properties are given. Advantages and disadvantages of different time hopping codes in terms of resource assignment for multiple-access communication systems are analyzed and discussed
The biomonitoring approach as a tool of trace metal assessment in an uncontaminated marine ecosystem: The island of Ustica (Sicily, Italy)
No full textMarine organisms were tested as possible biomonitors of heavy metal
contamination in a reference marine ecosystem, in Ustica (an island of the
Southern Tyrrhenian Sea). The goal of this preliminary work is to evaluate the
concentrations of Cu, Zn and Pb, using two gastropod molluscs, Monodonta
turbinata Born and Patella caerulea L.
Samples were collected in the tidal zone, at five coastal stations, according to
their availability. Namely, the stations included the Marine Reserve (a “Marine
Park” area), which is an uncontaminated site, and the Harbour station, where the
contamination level was expected to be higher than the other sites. In order to
gain additional information on both the environmental conditions of the area and
possible bioaccumulation patterns, seawater samples were also collected in each
site to assess soluble metal concentrations.
Statistical analyses (one way ANOVA and multiple comparison tests) were
applied to test the differences between metal concentrations in different sites and
species. Results show high concentration factors (CFs) with respect to the
concentrations in marine waters (soluble fraction). This confirms the suitability
of these species for biomonitoring purposes.
The metal concentrations recorded at the stations generally fall in the range of
the lowest values available in the literature and may be considered as useful
background levels to which to refer for intraspecific comparison within the
Mediterranean area
A biomonitoring study: trace metals in seagrass, algae and molluscs in a marine reference ecosystem (southern Tyrrhenian sea)
No full text
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
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