1,721,142 research outputs found
OPTMix tree budburst dates
No full textDataset purpose
This dataset is the budburst date monitoring of the OPTMix device (https://www.optmix.efno.fr). The spring phenology of close to 130 oak trees (Quercus petraea) and 130 pine trees (Pinus sylvestris) is monitored since 2013 on 21 experimental plots. The dataset contains the budburst dates for each tree, plot and year.
Site description
Data were collected in the south-eastern part of the Orléans National Forest (France, 47°49’ N, 2°29’ E) on 0.5-ha plots in the OPTMix experimental area (https://www.optmix.efno.fr). The Orleans National Forest is about 35 000 ha and is mainly composed of sessile oak and Scots pine. Elevation ranges from 107 m to 174 m above sea level. The area has a temperate continental climate with an oceanic influence: mean annual temperature is 10.8 °C and mean annual rainfall is 729 mm. The OPTMix experimental plots are several kilometers apart from each other with a maximum distance of 26 km. All the plots were set up in a same soil type characterized by a layer of sandy soil on surface and a clay layer appearing between 40 and 70cm depth. This type of soil is relatively poor and acidic with a sandy clay-loam texture, and is classified as a planosol. The stands are between 70 and 80 years old with an average dominant tree height of 20 m for oak and 22 m for pine. In the OPTMix experimental area, all understorey above two meters in height but shorter than the base of the main tree canopy, has been removed so that, the tree canopy is made up of a single layer. Each plot has an area of 0.5ha and is surrounded by a 20-meter-wide buffer zone with the same stand characteristics as the measurement plot. Among the 33 plots at the OPTMix site, we selected 18 plots: 6 monospecific sessile oak plots, 6 monospecific Scots pine plots and 6 plots of mixed stands of sessile oak and Scots pine. At the end of 2017, basal area was 16.9 m²/ha on average for oak monospecific plots, 23.9 m²/ha on average for pine monospecific plots and 20.9 m²/ha on average for oak-pine mixed plots.
Phenology observations and determining budburst dates
Phenological monitoring on the OPTMix experimental plots started in 2013. For each year, visual observations on budburst were made on a sampling of trees per plot. The objective of these observations was to obtain an estimate of the budburst date in order to define the beginning of the growing season for the different stands and tree species in the OPTMix experiment. On each plot, budburst was observed using binoculars on nine trees per species with one observation every weeks or every two weeks from April 1st to July 15th. The nine trees were randomly selected in three size classes of the stand and were all in the upper stratum of the stand. The sample trees were monitored over the years of this study. To limit operator effects, the observations were mainly made by one and the same person for the whole budburst period of one year and, when possible, the same person conducted the observations for several consecutive years. The phenological stage chosen for the observations was aligned with that of the RENECOFOR network to monitor sessile oak and Scots pine budburst over France: the BBCH09 stage of the BBCH scale. For sessile oak, stage BBCH09 corresponds to open buds visibly green in color and with possibly one unfolded leaf. This is the stage just before the complete development of the leaves. For Scots pine, stage BBCH09 corresponds to the moment when the needles begin to come out their sheath. At each observation date, on each tree, the percentage of buds having reached the target stage was recorded in five classes: 0%, 1 à 20%, 21 à 80%, 81 à 99% and 100%. For further analyses, we used the mean value of each class. For each selected tree, we therefore recorded the change over time in the proportion of buds having reached the target stage. We used the date when 50% of the buds reached the target stage to characterize budburst date. For each species, to obtain the value of the budburst date for one plot and one year, we fitted a the logistic regression (for more details see Perot, T., P. Balandier, C. Couteau, N. Delpierre, F. Jean, S. Perret and N. Korboulewsky (2021). "Budburst date of Quercus petraea is delayed in mixed stands with Pinus sylvestris." Agricultural and Forest Meteorology 300: 108326 DOI: https://doi.org/10.1016/j.agrformet.2021.108326)
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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