1,723,448 research outputs found
Production and spectroscopy of open-flavoured hadrons at hadron colliders
No full textStudies on the production and spectroscopy of heavy hadrons provide important inputs to test the reliability of several models and techniques. Recent results on the production of the charmed and beauty mesons and baryons at hadron colliders are summarized. The observations of new excited heavy hadrons and new decays are also presented
Charm Dalitz Analyses at BaBar
Full text linkDalitz plot analyses of D{sup 0} events reconstructed for the hadronic decay D{sup 0} {yields} {bar K}{sup 0}K{sup +}K{sup -} and D{sup 0} {yields} {bar K}{sup 0}{pi}{sup +}{pi}{sup -} are presented here. The analyses are based on a data sample of 91.5 fb{sup -1}. All data have been collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage rings at SLAC running at center-of-mass energies on and 40 MeV below the {Upsilon}(4S) resonance
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
Modeling of the Performance Loss due to Catalyst Deactivation in Fixed- and Fluidized-Bed Reactors
No full textA method to assess the impact of deactivation phenomena on the global performance of a catalytic reactor was developed. The methodology is applied here to the case of CO methanation, where the catalyst is subject to deactivation by coking. This method can be extended to other reactions and deactivation mechanisms. The method is based on the integration of a single differential equation to describe the activity of the catalyst and on the evaluation of the profiles in the reactor through consecutive steady states at progressively lower activity values. The model was applied successfully to both fixed- and fluidized-bed methanation, with small differences between the two cases. This model showed promising results in a case study, with a correct description of the decrease in the level of CO conversion due to coking. It also allowed us to observe the higher resistance to deactivation of fluidized-bed reactors compared to fixed-bed ones at similar conditions. The time needed to reach 25% conversion in fluidized-bed reactors was calculated to be 5 to 50 times higher compared to that in fixed-bed reactors. The model allows optimizing the reactor with respect to deactivation, acting on the reactor geometry, size, and operating conditions to achieve the best long-term performance
Cause multiple di morte: primi risultati di un'analisi della mortalità degli anziani in Italia
No full textDispelling 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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