1,720,954 research outputs found
Sedimentation Evolution of Dredged Estuary
No full textEstuarine sediment infilling is an emerging area of study due to sea-level rise; managed retreat and wetland restoration offer human-supported solutions. The Mink Meadows “Yacht Basin” on Martha’s Vineyard, created by dredging in 1963, provides an unlikely case study for the evolution of a human-constructed wetland over time. Sediment core samples of the basin and surrounding marshes were measured for fallout radionuclides 137Cs and excess 210Pb (210Pbex) to determine approximate amount and rate of sediment accumulation. Preliminary 210Pbex values and core analysis indicate quick initial sedimentation after dredging, followed by a steep decline in accumulation. Though near-constant 210Pbex concentrations in two lagoon cores suggest accelerating sedimentation rates, rates are not fast enough to fill significant portions of the lagoon before 2050; accounting for sea-level rise pushes the infill date estimate later. Approximately 40-48 cm of sediment have accumulated since dredging. Marsh cores are currently being analyzed for rate of sedimentation using 210Pbex concentrations to determine whether the surrounding marshes are a source of accumulating sediment. Tidal data will constrain saline-mobile 137Cs for more-precise dating. Moderately high LOI drops off sharply at the backhoe facies, suggesting heavily organic initial sediment followed by limited organic material. LOI core analysis is ongoing. Due to fluctuating LOI data, sediment source remains a question; SEM/XRD analyses will help further determine sediment composition. Current data show leveling similar to non-anthropogenic estuaries, suggesting successful geomorphologic stabilization. Evaluating the success and evolution of this constructed wetland will allow for better understanding of future wetland remediation efforts
Bryophyta sensu stricto presence and function in the epiphytic ecosystems of the tropical montane cloud forests of El Valle de Anton
Full text linkBryophyta sensu stricto, colloquially known as moss, is often found growing epiphytically in cloud forest ecosystems. Under these conditions, moss may fulfill a secondary foundational species (FS) role, supporting increased habitat for other organisms while remaining dependent on the primary FS host tree. Exploring the dual relationship of moss as both a dependent and supportive organism allows for better understanding of its connective role within ecosystems. Research in the cloud forests of El Valle de Anton focused on relative abundance, environmental surroundings, morphology, and microclimate of mosses to offer baseline data on these connections. Mosses along four different trails within cloud forest environments in El Valle de Anton were found to have a variety of morphological characteristics, coverage, and thickness, indicating high variability in growth patterns depending on environmental factors. Water capacity and retention were found to be consistent and considerable. Local temperature and humidity within tested moss mats were reliably distinct from and less variable than environmental temperature and humidity. Moss mats were shown to maintain a distinct and unique microecosystem, as supported by hygrometric data. By surveying the connective role of mosses within ecosystems and as ecosystems, the functionality of secondary FS organisms is better understood in under-researched cloud rainforest environments
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
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