1,721,002 research outputs found
Multivariate geostatistical mapping of radioactive contamination in the Maddalena Arcipelago (Sardinia, Italy)
No full textTo improve the quality of prediction of radioactive contamination,
geostatistical methods, and in particular multivariate geostatistical
methods, are increasingly being used. These methods, however, are optimal only in the case in which the data may be assumed Gaussian and do not properly cope with data measurements that are discrete, nonnegative, show some degree of skewness, or present exact zeroes. To deal with these situations, here we consider a hierarchical model in which non-Gaussian variables of different kind are allowed to be dealt with simultaneously. We show that when observations are assumed to be conditionally distributed as Poisson, Gamma and Compound Gamma, variograms and cross-variograms have convenient simple forms.
This work has been inspired by radioactive contamination data from the Maddalena Archipelago (Sardinia, Italy)
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
Observer based sensor fault detection and isolation for chemical batch reactors
No full textIn this paper a scheme for sensor fault diagnosis in chemical batch reactors is proposed. The scheme is based on a bank of two observers aimed at generating a set of residuals sensitive to faults occurrence. The observers are designed via a H∞ approach, so as to guarantee faults detection and isolation even in the presence of external disturbances and modeling errors. The heat released by the reaction is estimated via an universal approximator, based on radial basis functions, whose weights are adjusted on-line. Finally, the estimates provided by the observers and the sensor measures are processed to provide information about the faulty sensor as well as an healthy measure. In order to test the effectiveness of the proposed approach, a simulation case study is developed
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
Robust Fault Detection and Isolation for Proprioceptive Sensors of Robot Manipulators
No full textIn this paper a scheme for detecting and isolating proprioceptive sensor faults in industrial robot manipulators is devised. To the purpose, an analytical redundancy approach has been pursued, based on a bank of state observers for residual generation. Namely, an extended H∞ approach is adopted and the compensation of poorly known dynamics in each observer is improved by the use of a Radial Basis Functions (RBFs) neural network. The design of the observer matrix gain is achieved by solving a Linear Matrix Inequality (LMI) feasibility problem, where constraints on the position in the complex plane of the poles of the estimation error dynamics are taken into account. Finally, in order to test the effectiveness of the proposed approach, a case study is developed, based on experiments performed on a six-degree-of-freedom Comau Smart-3 S industrial manipulato
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
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