1,720,960 research outputs found
A fetal weight reference for twins based on ultrasound measurements
No full textBackground and ObjectiveFetal growth and size are known indicators of perinatal health, although the etiology of this relationship is unclear, and twins are known to differ from singletons with respect to fetal growth trajectories over the course of pregnancy. With a lack of research on ultrasound-based fetal weight references in twin populations, this study aimed to construct ultrasound-based in utero fetal weight references for each gestational age for a twin population.MethodsTwins delivered at a tertiary care hospital in Montreal were used in this study. Fetal weight was calculated using a published formula that was validated in this population. Fetal growth was then modeled in twins using serial ultrasound measurements of fetal weight, and adjusting for sex and chorionicity. Linear mixed models were used to adjust for the correlation between twins from the same pregnancy, and for the use of multiple ultrasound measurements for each fetus. Restricted cubic splines were used to account for the non-linear growth of fetuses over the course of pregnancy. Predictions were made from this regression model for the 1st, 10th, 50th, 90th and 99th fetal weight percentiles for the gestational period between weeks 22 and 37.ResultsMedian gestational age at birth was 37 weeks, with a predicted median birth weight of 2686 g. The rate of change in fetal weight was observed to be S-shaped over the course of pregnancy, with a period of accelerated growth in the second trimester, and slower growth in the third trimester. Ultrasound-based fetal weight references constructed from this population corroborated other published ultrasound-based fetal weight references in twin populations. As expected, fetal weight in twins was consistently lower than singletons over the course of pregnancy, when compared with other published fetal weight references.ConclusionsThe ultrasound-based fetal weight reference and predicts fetal weight at each gestational age, estimates which could be used to assess fetal size at each gestational age in twin pregnancies. This study additionally validates the use of formulae to estimate fetal weight in a twin population, and adds to literature published in this field.Considérations préliminaires et objectifLa croissance in utero des jumeaux diffère de celle des enfants uniques. La croissance et la taille foetale sont des indicateurs communs de santé périnatale, bien que la nature exacte du lien de causalité soit encore incertaine. La surveillance de la taille foetale s'inscrit naturellement dans le suivi des grossesses. L'imagerie par ultrasons a permis l'élaboration de normes pondérales ultrasonographiques in utero pour les enfants uniques. Moins d'efforts ont été déployés pour quantifier les variations de taille des jumeaux au cours de la grossesse. Le présent ouvrage cherche à proposer une norme pondérale in utero pour les jumeaux.MéthodeLe poids foetal a été estimé grâce à une formule validée pour la population retenue. La croissance intrautérine des jumeaux a été modélisée à l'aide d'estimés pondéraux ultrasonographiques prenant compte du sexe et de la chorionicité. Des splines cubiques naturels ont été utilisés pour rendre compte de la non-linéarité de la croissance foetale. Le modèle de régression a permis d'obtenir des prédictions pour les 1er, 10e, 50e, 90e et 99e centiles du poids foetal de la 22e à la 37e semaine de grossesse. RésultatsLa norme pondérale ultrasonographique élaborée à partir de la population retenue était compatible avec des normes de même nature publiées précédemment. Tel que prévu, le modèle a révélé que le poids in utero des jumeaux était systématiquement plus bas que celui des enfants uniques, les valeurs de référence pour ce dernier étant tirées d'une norme pondérale reconnue. ConclusionLa norme pondérale ultrasonographique in utero pour les jumeaux tirée de cette étude complémente la littérature traitant de la croissance intrautérine des jumeaux, peu étoffée en comparaison avec celle portant sur la croissance intrautérine des enfants uniques. Après validation externe, elle pourrait se révéler utile en pratique clinique
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
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
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
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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