1,720,974 research outputs found
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
p-adic Integration for Derived Equivalent Abstract Hitchin Systems
Get PDFLet Mˆ denote the moduli space of SLn-Higgs bundles and let Mˇ denote the moduli space of PGLnHiggs bundles. Under the appropriate conditions and equipped with some additional data, Mˆ and Mˇ form a dual pair of abstract Hitchin systems in the sense of [GWZ20b]. The authors make the superfluous assumption in loc. cit. that the stacks defining the abstract Hitchin systems are quotient stacks. This is sufficient for their purposes as their intended application is resolving the topological mirror symmetry conjecture of Hausel-Thaddeus in [HT03]. In particular, they prove that the Hodge numbers of Mˆ , which is a smooth variety, are equal to the stringy Hodge numbers of Mˇ , which is a smooth orbifold.
In this thesis, the notion of abstract Hitchin systems is extended to certain tame Deligne-Mumford stacks, subject to some conditions. This allows us to remove the assumption that the abstract Hitchin systems are Zariski-locally quotient stacks. This is achieved via passing to an ´etale cover on which the stack is a quotient stack, using an original lemma that says we can choose ´etale neighbourhoods of points such that the residue field remains unchanged. This allows us to apply the methods of p-adic integration as in [GWZ20b] and [GWZ20a].
In [HT03], it is shown that the spaces Mˆ and Mˇ are generically fibred over the Hitchin base in Lagrangian tori. Furthermore, each space is equipped with a gerbe, and are dual in the sense that the fibres are torsors over an abelian variety and are isomorphic as torsors to the equivalence classes of trivializations of the gerbe on the dual fibre. A similar algebro-geometric version of this duality is formulated for abstract Hitchin systems in [GWZ20b] and it is shown that topological mirror symmetry follows from an arithmetic version proven via p-adic integration. We reformulate this duality condition as a twisted derived equivalence of abstract Hitchin systems equipped with certain gerbes and recover arithmetic mirror symmetry via p-adic integration in this context.Ph.D
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
Broken Toric Varieties and Hypertoric Hitchin Systems
Get PDFIn the first part of this thesis we study the cohomology of broken toric varieties via the derived push-forward of the constant sheaf to a complex of polytopes, using it to prove a Deligne-type decomposition theorem and degeneration of the associated Leray-Serre spectral sequence. We discuss certain maps between broken toric varieties and how they descend to maps of cohomology groups. Furthermore, we give a description of the Betti numbers of some broken toric varieties whose associated complex of polytopes is the n-skeleton of a higher dimensional polytope, encompassing some important examples.
In the second part we investigate hypertoric Hitchin systems, whose cohomology is governed by a subvariety which is broken toric. After reviewing their construction, we give a new proof of a deletion-contraction relationship on these varieties (first proven by Dansco-McBreen-Shende) and refine it to a statement about the cohomology of certain sheaves on the polytopal complex. Using these facts and the general results in the first part of the thesis, we develop tools for calculating the cohomology of some families of hypertoric Hitchin systems inductively, given knowledge of some base cases. In particular, this yields explicit formulae for the Poincaré polynomials of hypertoric Hitchin systems associated to graphs with first Betti number 2.Ph.D
Descent Techniques in Algebraic K-theory
Get PDFWe investigate two different approaches to describing algebraic K-theory of schemes through descent techniques, one of global nature and the other of local nature.
The first half of the thesis is devoted to the study of an adelic descent statement for algebraic K-theory of Noetherian schemes, or more generally for any localizing invariants in place of algebraic K-theory. Given a Noetherian scheme of finite Krull dimension, Beilinson's cosemisimplicial ring of reduced adeles on provides a resolution of the structure sheaf of . We prove that for any localizing invariant of small stable -categories, e.g., nonconnective algebraic K-theory of Bass-Thomason, there is a natural equivalence . This can be viewed as a variant of the formal glueing problem for algebraic K-theory which concerns all irreducible closed subsets at once. We prove the descent statement by first converting the question to a cubical descent statement, and then constructing exact sequences of perfect module categories over adele rings.
In the second half of the thesis, we turn our attention to the study of -adic K-theory of characteristic rings. Specifically, we provide an alternative proof of Kelly-Morrow's generalization of Geisser-Levine theorem to the Cartier smooth case. Our approach puts emphasis on utilizing motivic filtration and descent spectral sequence. Using the homological smoothness of Cartier smooth rings, we first compute their prismatic cohomology and syntomic cohomology complexes. Through motivic filtration, this computation gives a description of topological cyclic homology for Cartier smooth rings. Then, we use the pro-\'etale descent spectral sequence for topological cyclic homology and rigidity properties of the cyclotomic trace and syntomic cohomology complexes to deduce the result, computing algebraic K-theory of local Cartier smooth rings in terms of their logarithmic de Rham-Witt groups. We also collect some direct consequences of our arguments to prismatic cohomology complexes of Cartier smooth rings and their -torsion free liftings to mixed characteristic.Ph.D
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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