1,720,953 research outputs found
Risorse idriche nella Toscana meridionale
No full textLe elaborazioni effettuate per il territorio della Toscana meridionale hanno consentito di pervenire ad una valutazione attendibile della sua potenzialità idrica superficiale e sotterranea; ciò risulta particolarmente importante in quanto permette di contenere i prelievi d'acqua entro i limiti propri di rinnovabilità delle risorse, evitando pericolosi sovrasfruttamenti, e di ripartire gli stessi prelievi in funzione delle effettive disponibilità idriche dei singoli domini. È stato anche evidenziato come l’intervento antropico sul ciclo dell’acqua sia capace di variare sensibilmente la reale ripartizione delle risorse idriche; gli Enti preposti alla gestione del territorio dovranno quindi mettere a punto un sistema di rilevamento di informazioni attendibili su usi e spostamenti di quantitativi d’acqua.
Lo studio ha anche consentito di riconoscervi un’evoluzione climatica caratterizzata da un probabile trend verso la diminuzione delle risorse idriche potenziali rinnovabili, che è sostanzialmente legato alla diminuzione delle precipitazioni totali annue in quanto le variazioni osservate di temperatura contribuiscono a provocare solo oscillazioni di minore entità dell'evapotraspirazione reale; è probabile che ciò si sia variamente distribuito nelle stagioni (Barazzuoli et al., 2002), con trend diversi come segno e verso nelle varie località, con il risultato di una variazione tendenziale che penalizza le stagioni di transizione (forte diminuzione delle piogge autunnali e delle temperature primaverili, accanto all'aumento delle temperature autunnali). La risorsa idrica disponibile appare comunque adeguata a soddisfare le richieste attuali e future dei vari utilizzatori. Anche se al momento non sono note valutazioni aggiornate e complessive sulla domanda idrica, si può però ricordare che i fabbisogni previsti nei prossimi decenni nei bacini del fiumi Ombrone e Bruna sono pari a 90-95•106 m3/anno per l’uso idropotabile, industriale ed i servizi ed a 50-55•106 m3/anno per l’uso agricolo, per un totale di 140-150•106 m3/anno (CLES, 1991); per gli stessi bacini, i risultati ottenuti nel presente studio indicano una disponibilità media attuale di circa 1000•106 m3/anno di risorsa totale potenziale rinnovabile, con previsioni di circa 900•106 m3/anno per il trentennio 1996-2025 (-8 %). Anche se le risorse idriche coincidono, in definitiva, con i volumi d'acqua utilizzabili senza che ciò possa provocare forti squilibri al ciclo idrologico naturale, è evidente che nel territorio della Toscana meridionale la disponibilità idrica totale potenziale (attualmente pari in media a circa 1800•106 m3/anno, con previsioni al 1996-2025 di circa 1700•106 m3/anno) è ampiamente superiore alla domanda e lo sarà anche nei prossimi anni; ad esempio, il Piano d’Ambito nell’Ombrone (A.A.T.O. 6, 1999) prevede un fabbisogno di 55•106 m3/anno al 2020 (per l’uso idropotabile, con una dotazione media di 400 l/giorno per abitante). Pertanto, i problemi ricorrenti di mancanza d’acqua, riduzione della qualità chimica, ecc.. sono unicamente la conseguenza di una non corretta gestione delle risorse che trova il suo fondamento su ampie lacune conoscitive di tipo idrogeologico e su uno sfruttamento troppo “ingegneristico-minerario” degli acquiferi. A questo riguardo, il recente avvio delle attività dell’Autorità di Ambito Territoriale Ottimale e dell’Autorità di Bacino dell’Ombrone costituisce senz’altro un passo fondamentale nella direzione della tutela e conservazione delle risorse idriche superficiali e sotterranee della Toscana meridionale, direzione che va però mantenuta con impegno e coerenza anche negli anni a venire. In altre parole, un vero e proprio salto di qualità nelle conoscenze è possibile solo attraverso la messa a punto e la realizzazione di un adeguato sforzo organizzativo ed economico da parte degli Enti gestori del territorio e delle sue risorse, prima fra tutte quella idrica
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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