1,721,022 research outputs found
Characteristic classes of vector bundles with extra structure
No full textIn dieser Arbeit ist das Verhalten von
charakteristischen Klassen auf Vektorbündeln untersucht, die eine
bestimmte zusätzliche Struktur tragen. Ich habe zwei Typen solcher
Strukturen ins Auge gefasst, und sie in zwei unabhängigen Teilen
behandelt. Der erste Teil benützt Orientierung und Spin-Struktur,
und verläuft entlang der Literatur in diesem Gebiet, vor allem
[Baum]; und im Riemannschen Abschnitt [Lawson & Michelsohn].
Ich mache einige Bemerkungen dazu und habe zwei offene Fragen, auf
den Seiten 23 und 27. Der zweite Teil benützt komplexe Struktur und
folgt einer Idee, zu der ich noch keine Literatur gefunden habe.
Der Abschnitt 2.5 über beinahe komplexe Spin-Mannigfaltigkeiten auf
Seite 26 verbindet die beiden Teile. Für die Konstruktion
sämtlicher von mir benutzten charakteristischen Klassen verweise
ich auf [Milnor & Stasheff].This work is about properties of
characteristic cohomology classes which occur when a special
structure on vector bundles is given. I have focused on two
different types of these structures, treated in two independent
parts. The first part uses orientation and spin structure, and
follows the literature in this area, mainly [Baum] and in the
Riemannian section [Lawson & Michelsohn], with some remarks.
Two open questions are left in it, on pages 23 and 27. The second
part uses complex structure and follows an idea on which I haven"t
found literature so far. The section 2.5 about almost complex spin
manifolds on page 26 gives the link between the two parts. For the
construction of all the characteristic classes I use, I refer to
[Milnor & Stasheff]
On the Cohomological Crepant Resolution Conjecture for the complexified Bianchi orbifolds
Get PDFpeer reviewedWe give formulae for the Chen--Ruan orbifold cohomology for the orbifolds given by a Bianchi group acting on complex hyperbolic 3-space. The Bianchi groups are the arithmetic groups PSL_2(A), where A is the ring of integers in an imaginary quadratic number field.
The underlying real orbifolds which help us in our study, given by the action of a Bianchi group on real hyperbolic 3-space (which is a model for its classifying space for proper actions),
have applications in physics.
We then prove that, for any such orbifold, its Chen-Ruan orbifold cohomology ring
is isomorphic to the usual cohomology ring of any crepant resolution of its coarse moduli space.
By vanishing of the quantum corrections, we show that this result fits in with Ruan's Cohomological Crepant Resolution Conjecture."Geometria delle varieta' algebriche", FRA 201
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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