1,720,992 research outputs found
Dynamic identification of a modern bell tower: resonance cancellation through stiffness intervention
No full textDesign Optimization of Aluminium-Steel Devices for Passive Protection of Structures
No full textThe present paper deals with the design optimization of an aluminium yieldingbased
device. The design criteria and the response of a 3D steel frame equipped
with the proposed device under seismic actions are discussed
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
Geometry of smooth Gaussian fields
Full text linkGaussian fields are ubiquitous in probability as they are scaling limits of many natural objects, and in applied science as they are instrumental in modelling natural phenomena. In this thesis, we study geometric features of smooth Gaussian fields, like the measure of level sets and the structure of critical points of the field. Large-scale geometry, i.e. studying geometric observables in a domain where the domain size goes to infinity, is of particular interest.In the first chapter, we formally define smooth Gaussian fields and state their basic properties. Then we briefly explain connections to other topics in mathematics, including percolation theory, quantum chaos, and real algebraic geometry.Next, we study the measure of level sets of stationary Gaussian fields. Given two Gaussian fields that are close, we ask how close the measures of their level sets are in a given domain. Here we bring novel ideas (in this context) from geometric analysis to answer this question. We prove the convergence of the Hausdorff measures of level sets of smooth Gaussian fields when the levels converge. Given two stationary fields f_1,f_2 on a probability space , we estimate the difference of Hausdorff measures of level sets in expectation, in terms of C^2-fluctuations of the field F= f1−f2. We prove this using the mean curvature representation of the difference in measure of level sets. This approach is different from using a Kac-Rice type formula as the primary tool in the analysis. This chapter is based on joint work with Dmitry Belyaev [BH23]. We extend this result in several directions, thanks to a subsequent work of Peccati and Stecconi [PS25]. The extended result also applies to some non-stationary fields and improves the exponent of the bound to a (conjecturally) optimal one. Also, we require only C^0-fluctuations of the difference field F. The extended result is an ongoing work with Michele Stecconi and Francesca Pistolato.In the third chapter, we study the critical point structure of smooth Gaussian fields. We consider the point process (in R^d) of local maxima of Gaussian fields, with sufficient decay of correlation at infinity, above a level u. We show that this point process, rescaled appropriately, converges weakly to a Poisson point process in the limit u → ∞. In the literature, high excursion sets of many smooth and non-smooth Gaussian processes of decaying correlation are well studied [LLR83]. Also, for Gaussian processes with some Markov property, like Brownian motion or the Gaussian free field, high points (after suitable rescaling) have been shown to converge to a Poisson process. Our proof relies on the classical observation that simple point processes are characterised by avoidance probabilities (i.e. P(η(B) = 0) for Borel sets B). Then, we approximate avoidance probability with excursion probability, where the latter is well studied.Another significant result in the thesis is a quantified version of the Poisson convergence of high critical points of smooth Gaussian fields. We show that, for Bargmann-Fock field in two dimensions, the total variation distance between a Poisson random variable and the number of local maxima of the field above a threshold u in an R×R box in R2 decays like exp(−βu^2), for some fixed β > 0. As an immediate consequence, when the level u is a function of R such that u(R) →∞ and u(R)/√log R →0 as R →∞, we have a quantitative central limit theorem for the number of high local maxima. The proof is based on the Chen-Stein method for quantitative Poisson approximation [CX04]. The basic idea is that, for any point process η , if η and its Palm version are “close” in some (pseudo)metric, then η is “close” to a Poisson point process. Here, we produce a close coupling of a (non-degenerate) stationary smooth field and its Palm version. Then, we study the difference in the number of critical points using smooth flows of critical points. We believe the same method/argument works for any non-degenerate stationary Gaussian field with sufficient correlation decay and in any dimension.This thesis’s critical point structure results are joint with Dmitry Belyaev
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
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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