1,720,965 research outputs found
Valutazione degli effetti singoli e combinati dello stress idrico e termico sulla fisiologia della vite e sulla qualità dell'uva nella regione Friuli-Venezia Giulia
No full textL'impatto dei cambiamenti climatici, in particolare dell'aumento delle temperature, sulla fisiologia della vite e sulla qualità del vino sta diventando una preoccupazione crescente in viticoltura. In questa tesi, utilizziamo varie metodologie per esplorare i molteplici effetti dello stress termico, dello stress idrico e della loro influenza combinata sulle viti. Inizialmente, abbiamo esaminato l'impatto dello stress termico sulla fisiologia della vite utilizzando un approccio di revisione sistematica. Questo approccio ci ha permesso di raccogliere informazioni dettagliate, che saranno fondamentali in futuro per definire una gestione sostenibile del vigneto in condizioni climatiche mutevoli. Successivamente, attraverso una serie di prove sperimentali ad hoc, abbiamo studiato in dettaglio la risposta della vite agli scenari climatici futuri previsti nella regione Friuli-Venezia Giulia. Nel terzo capitolo viene descritta la sperimentazione allestita in un vigneto per simulare, nel modo più realistico possibile, le condizioni di stress idrico, di stress termico e di stress combinato che potrebbero verificarsi nella regione Friuli-Venezia Giulia in futuro. L'obiettivo era valutare gli effetti che questi stress potrebbero avere su una delle varietà più importanti della regione, il Sauvignon blanc. Abbiamo utilizzato un sistema di esclusione delle piogge a terra e un sistema di tipo open-top chamber per riscaldare l'uva. Questo sistema ci ha permesso di ottenere i vini dalle parcelle sperimentali e valutare gli effetti qualitativi degli stress anche a livello del prodotto finito. Successivamente, alla luce dei risultati ottenuti, abbiamo ritenuto necessario indagare gli effetti delle condizioni climatiche modificate a livello metabolico dell'uva. Nel quarto capitolo viene descritta la prova e il protocollo sviluppati per la coltivazione in vitro di bacche di Sauvignon blanc in un ambiente controllato. Questo approccio ci ha permesso di escludere definitivamente eventuali effetti sinergici di risposta che potrebbero verificarsi in campo aperto. In questi ultimi due esperimenti ci siamo concentrati principalmente sulla biosintesi dei precursori tiolici. Questi precursori sono composti chiave che, durante la fermentazione, vengono trasformati in composti volatili odorosi chiamati tioli, responsabili degli aromi più intensi e tipici di questo vino. Nel quinto capitolo, affrontiamo la caratterizzazione fisiologica e produttiva della varietà resistente ai funghi Merlot Khorus in diversi regimi idrici, con l'obiettivo di fare luce sulla sua idoneità a una futura viticoltura sostenibile e a basso consumo idrico nel Nord-Est dell'Italia. In un futuro contesto di ottimizzazione delle limitate risorse idriche, la loro gestione richiederà misurazioni precise e affidabili dello stato idrico delle piante. A questo scopo, nell'ultimo capitolo, affrontiamo il problema della corretta determinazione del potenziale idrico, poiché ad oggi gli effetti delle specie/cultivar e delle stagioni sulla determinazione affidabile di questo parametro non sono stati ancora sufficientemente testati. Alla fine di questo capitolo, definiamo le procedure corrette che dovrebbero essere adottate per ottenere una determinazione ottimale dello stato idrico.The impact of climate change, especially rising temperatures, on vine physiology and wine quality is becoming an increasing concern in viticulture. In this thesis, we employ various methodologies to explore the multifaceted effects of thermal stress, water stress, and their combined influence on grapevines. Firstly, we examine the impact of heat stress on grapevine physiology using a systematic review approach. This approach allows us to gather detailed information, which will be fundamentally important in the future for defining sustainable vineyard management in changing climate conditions. Subsequently, through a series of ad hoc experimental trials, we studied in detail the vine's response to the future climate scenarios expected in the Friuli-Venezia Giulia region. Chapter three describes the trial that we set up in a vineyard to simulate, in the most realistic way possible, the conditions of water stress, heat stress, and combined stress that could potentially affect the Friuli Venezia Giulia region in the future. The objective was to assess the effects that these stresses could have on one of the most important varieties in the region, Sauvignon blanc. We employed rain-exclusion systems on the ground and an open-top chamber system to heat the grapes. This system allowed us to obtain wines from the experimental plots and evaluate the qualitative effects of stresses at the finished product level. Subsequently, in light of the results obtained, we found the need to investigate the effects of the modified climatic conditions at the metabolic level of the grapes. Chapter four describes the test and system we developed for the in vitro cultivation of berries of Sauvignon blanc in a controlled environment. This approach allows us to definitively exclude any potential synergistic response effects that might occur in the open field. In these last two experiments we mainly focused on the biosynthesis of thiol precursors. These precursors are a key compounds, during fermentation they are transformed into odorous volatile compounds called thiols which are responsible for the more intense and typical aromas of this wine. In chapter five, we addressed the physiological and productive characterization of the fungus-resistant variety Merlot Khorus under different water regimes, aiming to shed light on its suitability for future sustainable and low-water input viticulture in the North-East of Italy. In a future context of optimization of limited water resources, their management will require precise and reliable measurements of the water status of plants. For this purpose, in the last chapter, we addressed the problem of the correct determination of water potential, since to date the effects of species/cultivars and seasons on the reliable determination of this parameter have not yet been adequately tested. At the end of this test we define the procedures that should be performed for the correct determination of the water status
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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