1,721,129 research outputs found
On the uniform Rasmussen-Tamagawa conjecture in the CM case
Get PDFWe prove a uniform version of a finiteness conjecture due to Rasmussen and Tamagawa in the case of CM abelian varieties. This extends the result of [2] from elliptic curves to abelian varieties of arbitrary dimension
Non-isogenous abelian varieties sharing the same division fields
Get PDFTwo abelian varieties A1, A2 over a number field K are strongly iso-Kummerian if the torsion fields K(A1[d]) and K(A2[d]) coincide for all d >= 1. For all g >= 4 we construct geometrically simple, strongly iso-Kummerian g-dimensional abelian varieties over number fields that are not geometrically isogenous. We also discuss related examples and put significant constraints on any further iso-Kummerian pair
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
How far is an extension of p-adic fields from having a normal integral basis?
No full textLet L/K be a finite Galois extension of p-adic fields with group G. It is well-known that OL contains a free OK[G]-submodule of finite index. We study the minimal index of such a free submodule, and determine it exactly in several cases, including for any cyclic extension of degree p of p-adic fields
Stato sanitario dei colombi della città di Bolzano
Get PDFI colombi urbani, per il loro stato sinantropico, costituiscono un considerevole rischio sanitario per i cittadini e gli animali con cui
vengono in contatto. In questo lavoro vengono riportati i risultati delle analisi fatte a Bolzano sul loro stato sanitario, nel quadro di un
progetto di gestione e monitoraggio della locale popolazione di colombi. Le prevalenze di Chlamydiaceae riscontrate nel periodo 2001-
2009 sono sempre risultate elevate, ma in linea con quanto noto in letteratura, sicché è possibile defi nire questo batterio come un ospite
stabile del colombo, nonché uno dei maggiori agenti zoonotici. Prevalenze egualmente elevate sono state riscontrate per Toxoplasma
gondii. Al contrario non sono stati individuati colombi affetti da salmonellosi e Febbre Q, e del tutto episodici i casi di borreliosi. Le
prevalenze di infestazione da larve di Argas refl exus sono risultate diminuite fortemente rispetto agli anni ’90, fatto che con l’assenza
di casi di salmonellosi, depone a favore della qualità dell’ambiente bolzanino. Sono state ritrovate cinque specie di parassiti intestinali
alcune delle quali con una abbondanza così alta da determinare l’occlusione del dotto intestinale. I risultati sono discussi in vista del
rischio che i vari patogeni costituiscono per l’uomo e gli altri animali, con un focus sui fattori potenzialmente responsabili dell’alta
occorrenza di Chlamydiacea
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