1,720,953 research outputs found
Spatial dependence of extreme rainfall in the Seveso-Lambro-Olona basin: an integrated analysis using citizen science and official data
Full text linkLAUREA MAGISTRALEQuesta tesi analizza la dipendenza spaziale degli eventi di pioggia estrema nel bacino del Seveso-Lambro-Olona, integrando e analizzando dati provenienti sia da stazioni istituzionali (ARPA) che da reti di citizen science (METEONETWORK). Motivato dalla necessità di disporre di dati pluviometrici ad alta risoluzione e coerenti nello spazio per le aree urbane soggette a rischio idraulico, lo studio è articolato in tre obiettivi principali: la validazione e il completamento dei dati delle stazioni non istituzionali, la caratterizzazione della dipendenza spaziale tra eventi estremi e la generazione di eventi sintetici che riflettano tale dipendenza.
La prima parte del lavoro si concentra sulla validazione dei dati di METEONETWORK basandosi sul confronto tra la loro correlazione spaziale e quella dei dati ufficiali di ARPA. Inoltre, le serie temporali orarie di pioggia delle stazioni METEONETWORK, spesso affette da lacune sono state ricostruite producendo serie ininterrotte. È stato applicato un metodo di imputazione basato su stazioni donatrici e riceventi per completare le serie mancanti, e si è verificato che la ricostruzione del dataset non modificasse la correlazione spaziale. Questo passaggio ha inoltre consentito di selezionare un sottoinsieme di stazioni affidabili da utilizzare nella fase finale di modellazione.
Nella seconda parte, la dipendenza spaziale degli eventi estremi è stata esaminata mediante il modello dei valori estremi condizionati di Heffernan e Tawn, un approccio statistico flessibile in grado di rappresentare tra gli estremi.
Infine, a partire dal modello calibrato, sono stati simulati eventi estremi sintetici tramite metodi Monte Carlo, generando 1000 anni di scenari multivariati plausibili. Queste simulazioni hanno dimostrato che il superamento di certi livelli di precipitazione a più stazioni ha tempi di ritorno molto maggiori di un certo tempo di ritorno desiderato, contribuendo a una migliore comprensione e gestione del rischio idraulico nei bacini urbani complessi.This thesis investigates the spatial dependence of extreme rainfall in the Seveso-Lambro-Olona basin by integrating and analyzing data from both institutional (ARPA) and citizen-science (METEONETWORK) stations. Motivated by the need for high-resolution and spatially coherent rainfall data in flood-prone urban areas, the study is structured around three core objectives: validating and completing the non-institutional rainfall records, characterizing spatial dependence among extremes, and generating synthetic events that reflect that dependence.
The first part of the work focuses on validating the METEONETWORK data, based on a preliminary inspection of the spatial correlation they return compared to that returned by the official data of ARPA. Also, incomplete hourly rainfall time series from the METEO network, which are often affected by gaps, reconstructed to have full records. An imputation approach based on donor and receiving stations was used for the purpose, finally checking that reconstruction procedure did not change the spatial correlation, to ensure suitability for further analysis. This step also involved the selection of a subset of reliable stations for use in the final modelling stage.
In the second part, the spatial dependence of extreme rainfall was examined using the conditional extremes model of Heffernan and Tawn, a flexible statistical framework capable of representing spatial links between extremes.
Third, based on the fitted model, synthetic extreme rainfall events were simulated through Monte Carlo methods, producing a 1,000-year catalogue of plausible multivariate scenarios. These simulations demonstrated that combined exceedance of any threshold at multiple stations presents return periods that may be much larger than a target one, contributing to improved understanding and management of flood risk in complex urban basins
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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