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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
Nonlinear growth curves of sorghum roots under compost/traditional fertilization
No full textPlant roots are a major pool of total carbon in the planet, and their dynamics are directly relevant to greenhouse gas balance. Composted wastes are increasingly used in agriculture for environmental and economic reasons, but their role as a substitute for traditional fertilizers needs to be tested on all plant components. Compost application was compared to traditional fertilization for its effect on roots of Sorghum bicolor Moench x S. sudanense (Piper) Stapf. in a three-year experiment (2007-2009) in Southern Italy. Plant roots were monitored through sequential images taken with a digital microscope from 4 transparent acrylic access tubes per treatment, buried in the soil at 45° angle up to the soil depth of 60 cm from the surface. Roots on each 166 mm x 124.5 mm image were analysed and attributed to three categories: white, dark and gone. Total roots length, and surface area and average roots diameter were measured on each frame for the three root categories. Roots measurements distributions were assumed to follow an exponential dispersion model, namely the Tweedie distribution, in order to account for zero-inflation in the relative data. Generalized Additive Models (GAM’s) were used to evaluate the nonlinear longitudinal variation of roots measurements along “days after sowing”, together with the possible effects of fertilization treatment, depth and year and eventually adjusting for the confounding effect of the atmospheric temperature. GAM’s parameters were estimated by penalized likelihood maximization with smoothing degree given by generalized cross validation minimization. Residuals and likelihood ratio tests were used for model validation and comparison
Turnover radicale in Sorgo (Sorghum bicolor Moench x S. sudanense (Piper) Stapf) in relazione al sistema di gestione della fertilità del suolo
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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
Baj nel bel mondo allegro
No full textAnalisi critica dei recenti testi teorici e comparazione delle relative serie pittoriche e scultoree di Baj, in chiave di critica social
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