1,720,998 research outputs found
Climate change and grain production
Full text linkClimate change is a matter of fact, and it is expected to have nonnegligible effects on food security. 50 year-long time series of wheat and maize Italian average productions have been compared to the Western Mediterranean Oscillation Index, and to Sun Spot Number (SSN). Data trends and fluctuations are denoised by EMD and SSA, and analysed by wavelet transform. The analysis shows that SSN oscillations can be recognized into regional scale dynamics, and both signals significantly related to 7-16 years fluctuations of considered crops
Analyticity of a nonlinear operator associated to the conformal representation in Schauder spaces. An integral equation approach
No full textWe consider the Riemann map of the complex unit disk
to the plane domain enclosed by
the Jordan curve and normalized by the conditions , ,
where is a point of , and we
present a nonlinear singular integral equation approach to prove
that the
nonlinear operator which takes the pair
to the map is real
analytic in
Schauder spaces
Analyticity of a Nonlinear Operator Associated to the Conformal Representation of a Doubly Connected Domain in Schauder Spaces
Full text linkWe consider a suitably normalized Riemann map gζ of the plane annulus with , to the plane doubly connected domain enclosed by the pair of Jordan curves , and we present a nonlinear singular integral equation approach to prove that the nonlinear operator which takes the pair of functions to the triple of functions is real analytic in Schauder spaces
A tribute to Massimo Lanza de Cristoforis
No full textIn this paper we describe the main steps and achievements in the scientifict activity of Professor Massimo Lanza de Cristoforis from the beginning of his career up to now
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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