1,720,954 research outputs found
Développement de modèles hauteur-diamètre généralisés pour le Thuya (Tetraclinis articulata Vahl.) et le Pin maritime (Pinus pinaster Ait.) en Tunisie via une modélisation non-linéaire à effets mixtes
Full text linkTwo generalised height-diameter models, based on the non-linear mixed-effects modelling technique, were developed for cedar (Tetraclinis articulata Vahl.) and maritime pine (Pinus pinaster Ait.) in Tunisia. In addition to fixed parameters expressing an average behaviour identical to that of all trees, these models include random parameters specific to each growth environment, previously estimated using non-linear mixed-effects models and related to the dendrometric characteristics of the plots. The data used came from measurements of 590 trees selected from 50 temporary plots for cedar, and 797 trees also selected from 69 temporary plots for maritime pine, by systematic sampling for each species. Compared with the same non-linear fixed-effect models, the generalised height-diameter models developed resulted in a significant reduction in residual variance () of 53% (from 1.0910 to 0.5111) and 67% (from 8.5500 to 2.8049), while increasing the adjusted coefficient of determination () from 38% to 71% and from 49% to 83% for cedar and maritime pine, respectively. Use of the generalised height-diameter models developed in this study requires only measurement of tree diameter and estimation of stand characteristics (plot dominant height, H₀, basal area per hectare, G, and number of stems per hectare, N). Thanks to a low sampling effort, these models reduce the costs and time generally spent measuring the height of forest trees, while maintaining a high level of accuracy.Se han desarrollado dos modelos generalizados altura-diámetro, basados en la técnica de modelización no lineal de efectos mixtos, para el cedro (Tetraclinis articulata Vahl.) y el pino marítimo (Pinus pinaster Ait.) en Túnez. Además de parámetros fijos que expresan un comportamiento medio idéntico al de todos los árboles, estos modelos incluyen parámetros aleatorios específicos de cada entorno de crecimiento, previamente estimados mediante modelos no lineales de efectos mixtos y relacionados con las características dendrométricas de las parcelas. Los datos utilizados proceden de mediciones de 590 árboles seleccionados en 50 parcelas temporales para el cedro, y 797 árboles también seleccionados en 69 parcelas temporales para el pino marítimo, mediante muestreo sistemático para cada especie. En comparación con los mismos modelos no lineales de efectos fijos, los modelos altura-diámetro generalizados desarrollados dieron lugar a una reducción significativa de la varianza residual () del 53% (de 1,0910 a 0,5111) y del 67% (de 8,5500 a 2,8049), al tiempo que aumentaron el coeficiente de determinación ajustado () del 38% al 71% y del 49% al 83% para el cedro y el pino marítimo, respectivamente. La utilización de los modelos altura-diámetro generalizados desarrollados en este estudio requiere únicamente la medición del diámetro de los árboles y la estimación de las características de la masa (altura dominante de la parcela, H₀, área basimétrica por hectárea, G, y número de tallos por hectárea, N). Gracias a un bajo esfuerzo de muestreo, estos modelos reducen los costes y el tiempo que generalmente se dedica a medir la altura de los árboles forestales, manteniendo al mismo tiempo un alto nivel de precisión.Deux modèles hauteur-diamètre généralisés, basés sur la technique de modélisation non-linéaire à effets mixtes, ont été développés pour le Thuya (Tetraclinis articulata Vahl.) et le pin maritime (Pinus pinaster Ait.) en Tunisie. Ces modèles renferment en plus des paramètres fixes qui expriment un comportement moyen identique à tous les arbres, des paramètres aléatoires propres à chaque environnement de croissance, estimés préalablement à l’aide des modèles non-linéaires à effets mixtes et mis en relation avec les caractéristiques dendrométriques des placettes. Les données utilisées proviennent des mesures de 590 arbres sélectionnés dans 50 placettes temporaires pour le thuya, et de 797 arbres également choisis dans 69 placettes temporaires pour le pin maritime, par échantillonnage systématique pour chaque espèce. Comparés aux mêmes modèles non-linéaires à effets fixes, les modèles hauteur-diamètre généralisés développés ont permis une réduction significative de la variance résiduelle () de 53 % (passant de 1,0910 à 0,5111) et 67 % (passant de 8,5500 à 2,8049), tout en faisant passer le coefficient de détermination ajusté () de 38 % à 71 % et de 49 % à 83 % pour le thuya et le pin maritime, respectivement. L’utilisation des modèles hauteur-diamètre généralisés développés dans cette étude ne nécessite que la mesure du diamètre des arbres et l’estimation des caractéristiques du peuplement (hauteur dominante de la placette, H₀, surface terrière par hectare, G, et nombre de tiges par hectare, N). Grâce à un faible effort d’échantillonnage, ces modèles permettent de réduire les coûts et le temps généralement consacrés à la mesure de la hauteur des arbres forestiers, tout en maintenant un niveau de précision élevé
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
- …
