1,720,958 research outputs found
Influenza della risposta all’esercizio fisico sugli adattamenti cardiaci degli atleti adolescenti di entrambi i sessi
No full textBackground: Nell’ambito della definizione di parametri di normalità sesso-specifici ed età-specifici del ventricolo sinistro (VS), fondamentali per un attento screening nell’attribuzione dell’idoneità alla pratica sportiva di tipo agonistico, abbiamo recentemente analizzato atleti adolescenti di ambo i sessi dimostrando come, sin dall’adolescenza, le atlete, oltre a presentare minori spessori, volumi, massa e diametri cardiaci rispetto alla controparte maschile, sviluppano con minore prevalenza le alterazioni elettrocardiografiche (ECG) indotte dall’allenamento, quali la bradicardia sinusale, l’ipertrofia ventricolare sinistra e il pattern di ripolarizzazione precoce, suggerendo che rimodellamento elettrico e strutturale cardiaco siano strettamente correlati. Non è del tutto chiaro se tali differenze dipendano dal sesso di per sé, o siano influenzate da una diversa risposta cardiovascolare all’esercizio fisico. Lo scopo di questo studio è stato di valutare eventuali differenze sesso-correlate nell’andamento dei parametri emodinamici ed ECG durante esercizio fisico correlabili ai diversi adattamenti cardiaci degli atleti adolescenti. Disegno dello studio: È stata studiata una popolazione di 80 giovani atleti (età media 13,2±1,7 anni), di cui 31 femmine (F) e 49 maschi (M), praticanti sport a livello agonistico in diverse discipline con analoga intensità di allenamento. Tutti i partecipanti sono stati sottoposti, oltre che ad esame obiettivo, ed ecocardiogramma, a test da sforzo al cicloergometro considerando diverse fasi della prova: pre-esercizio, 2° e 4° minuto di esercizio, Picco dello sforzo, 2° e 5° minuto di recupero. Per ciascuno step sono stati misurati Pressione Arteriosa sistolica (PAs), Pressione Arteriosa diastolica (Pad), Frequenza Cardiaca (FC), Doppio Prodotto (DP) [(PAs) X (FC)] e calcolati, oltre ai parametri ECG classici quali la durata onda P, intervallo PR, QRS, QT, altri recentemente introdotti per la stratificazione del rischio aritmico, quali l’intervallo compreso tra l’onda Q e l’apice dell’onda T (QT peak) ed il rapporto QT peak/QT (Tpe ratio) per meglio definire le differenze di genere nel rimodellamento elettrico. Risultati: I due gruppi non differivano significativamente per età e n° di allenamenti settimanali ma altezza, peso e superficie corporea (BSA) erano superiori nei M (p<0,05). Al basale la PAs e PAd erano sovrapponibili mentre la FC era significativamente più alta nelle F (p<0.01). All’esame ecocardiografico, gli spessori e la massa indicizzata del VS (LVMI) erano significativamente aumentati nei M. Durante il test da sforzo, le F presentavano FC significativamente più alta al 2° e 4° min di esercizio raggiungendo la stessa FC dei M al picco ma con lenta riduzione nel recupero, senza differenze nell’andamento della PAs . Il DP, pur essendo sempre maggiore nelle F, raggiungeva la significatività nei primi due step dello sforzo. Nelle F, la durata del QRS era significativamente inferiore in tutti gli step (p<0.001) così come il Tpe al picco dello sforzo (p<0.05) e il QT nel recupero (p<0.05). All’analisi di regressione multipla, LVMI dipendeva significativamente (p=0,01) dal sesso, oltre che dalla BSA (p<0,001) ma non dal DP al picco dello sforzo. La durata del QRS era influenzata in tutte le fasi della prova non solo dal sesso ma anche dalla PAs ma non dalla LVMI mentre il Tpe dipendeva esclusivamente dal sesso. Il Conclusioni: Nelle atlete adolescenti, le differenze strutturali del VSn sembrano essere dipendenti principalmente dal sesso e dalla BSA ma non dalla diversa risposta emodinamica. Rimane da chiarire il ruolo del tipo di sport. Il sesso, come la PAs, influenza il QRS in ciascuna fase del test ergometrico confermando il suo ruolo anche negli adattamenti elettrici
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
- …
