1,721,050 research outputs found
The Fluorine in Surface Waters: Origin, and Weight on Human Health
No full textThe present geochemistry of fluorine in a given area is thus a result of the local geological history, whose structural fabric evolution may be strongly affected by rift structures. Fluorspar deposits must be considered only a possible end effect of the hydrothermal systems that always form along the rift faults and fractures and involve huge volumes of F-rich solutions directly or indirectly responsible for the origin and geochemical balance of fluorine in the surface waters.
On the other hand, this study enables to suggest the control of areas where the anomalies in fluoride can be expected to be harmful to health. Indeed, links between high grade fluorine and some diseases are well known. The fluorosis, which is particularly widespread in some developing countries grows where excessive F (as fluoride) occurs in the waters used for civilian purposes
Composizione isotopica del quarzo e della calcite di ganga del "giacimento argentifero" del Sarrabus (Sardegna sud-orientale) e sue implicazioni genetiche
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
- …
