1,720,963 research outputs found
A new device for in-situ pore-water sampling.
Full text linkA new prototype pore-water sampler is proposed which allows temporal sampling of pore-water from intertidal sediments. The system consists of a nylon device provided with regularly spaced chambers, double filtering ports and pipes for in-situ sample recovering. The field use of this apparatus for determining sulfur species in pore-waters is described; a satisfactory agreement between data obtained by using the proposed in-situ sampler and by core-squeezing in proper experimental conditions is found. Finally, advantages and differences with respect to other in-situ samplers are critically evaluated
Seasonal and depth variability of reduced sulphur species and metal ions in mud-flat pore-waters of the Venice lagoon.
No full textAn in-situ sampler was employed to monitor seasonal changes in the composition of pore-waters at different depths in a
mud-flat located in the central part of the Lagoon of Venice, in proximity of the industrial area of Port0 Marghera. The use
of voltammetric methods of analysis allowed the simultaneous determination of concentrations of reduced S(- II),
thiosulphate, Fe(I1) and Mn(I1) as well as zinc, lead, cadmium and copper ions. Other parameters such as the concentration
of sulphate, Eh, pH and conductivity were also measured. Seasonal increases of S( - II) and Fe(I1) concentrations in summer
and autumn samples were observed, with the highest concentrations located at about 25 and 55 cm depth, respectively. An
opposite seasonal dependence was observed for Mn(I1) and S,O:- concentrations, which displayed higher values in winter:
the highest concentrations were observed at a depth of 45 cm for Mn(I1) and of 65 cm for thiosulphate. The concentrations
of Cu, Cd, Pb and Zn ions showed a less evident seasonal variability. Top and bottom samples revealed high concentration
values for zinc and copper ions, with the highest values in the l,OOO- 1,600 nM and 100-300 nM ranges, respectively.
Cadmium and lead ions were present at lower concentrations, always less than 70 nM and 30 nM, respectively
Analysis of Pellets Found in the North Area of the Asiago Plateau (Vicenza, Italy), a Locality of the 1914-18 World War
No full textAnalysis of Roman wall paintings found in Verona
No full textThe present paper deals with the analysis of roman wall paintings fragments recovered from twelve buildings of Verona, Italy. The analytical techniques used were Optical Microscopy, Scanning Electron Microscopy (SEM) equipped with an EDS microanalysis detector, Xray powder diffraction (XRD) Fourier Transform infrared spectroscopy (FTIR) and Raman Spectroscopy. The wall preparation generally consisted of three layer: the pictorial layer, an intonachino layer of hydrated lime and a plaster one made of slaked lime and sand. The pigments found in the studied domus are different reflecting the taste and culture of X Regio of Italy but also the economical possibilities of the dominus and the building period
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
Metodi avanzati per il campionamento e l'analisi di acque interstiziali di sedimenti lagunari
No full textNUOVE METODOLOGIE PER IL CAMPIONAMENTO "IN SITU" E LA CARATTERIZZAZIONE ELETTROANALITICA DI ACQUE INTERSTIZIALI DI BARENE E VELME
No full textVariations 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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