1,721,371 research outputs found
On the topological complexity of total relatively hyperbolic groups
No full textWe prove that the topological complexity TC(π) equals cd(π×π) for certain toral relatively hyperbolic groups π
Bounded cohomology of classifying spaces for families of subgroups
No full textWe introduce a bounded version of Bredon cohomology for groups relative to a family of subgroups. Our theory generalizes bounded cohomology and differs from Mineyev and Yaman’s relative bounded cohomology for pairs. We obtain cohomological characterizations of relative amenability and relative hyperbolicity, analogous to the results of Johnson and Mineyev for bounded cohomology.</p
Equivariant bounded cohomology
No full textThis research paper thesis consists of the following articles:[1] K. Li. Bounded cohomology of classifying spaces for families of subgroups.To appear in Algebr. Geom. Topol., arXiv:2105.05223, 2021.[2] K. Li, C. Löh, and M. Moraschini. Bounded acyclicity and relative simplicialvolume. Preprint, arXiv:2202.05606, 2022.[3] K. Li. Amenable covers of right-angled Artin groups.Preprint, arXiv:2204.01162, 2022.[4] K. Li. On the topological complexity of toral relatively hyperbolic groups.Proc. Amer. Math. Soc., 150(3):967–974, 2022.In [1], we introduce a bounded version of Bredon cohomology for groups relative to afamily of subgroups. We obtain cohomological characterisations of relative amenabilityand relative hyperbolicity, analogous to the results of Johnson and Mineyev for boundedcohomology.In [2], joint with Clara Löh and Marco Moraschini, we provide new vanishing and glueingresults for relative simplicial volume. We consider equivariant nerve pairs and relativeclassifying spaces for families of subgroups. Our methods also lead to vanishing resultsfor `2-Betti numbers of aspherical CW-pairs with small relative amenable category.In [3], we consider the right-angled Artin group AL associated to a finite flag complex L.We show that the amenable category of AL equals the virtual cohomological dimensionof the right-angled Coxeter group WL.In [4], we prove that the topological complexity TC() equals cd( ) for certain toralrelatively hyperbolic groups
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
Chili pepper fruit-flower ratio, summarized to plots (EFForTS-BEE)
No full textSupporting data for "Tree islands enhance biodiversity and functioning in palm oil landscapes" (Zemp et al., 2023). This data summarizes phytometer chili data collected in the the Ecological and Socio-economic Functions of Tropical Lowland Rainforest Transformation Systems (EFForTS) Biodiversity Enrichment Experiment (BEE). The raw data that was processed to form this data is available at Li et al. (2021), referenced within the metadata. Fruit-flower ratio was calculated by dividing the total number of fruits harvested in each plot at the end of the experiment by the total number of flowers observed over a monitoring period prior to harvest. For more information, see the associated references
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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