1,721,035 research outputs found
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
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UNCOVERING SPATIAL AND TEMPORAL VARIABILITY IN THE PAST, PRESENT, AND FUTURE RESPONSE OF SOUTHERN CALIFORNIA’S WETLANDS TO ENVIRONMENTAL CHANGE
Full text linkClimate change threatens the future of coastal wetlands, one of the most ecologicallyimportant, economically valuable ecosystems on earth. Changes to normal climatic and environmental conditions could throw off the delicate balance of these ecosystems with negative consequences to wetland biological response, productivity, and ultimately, resilience. Wetland response is controlled by biogeomorphic feedbacks relating plant productivity to environmental conditions, a complex interaction that can vary over space, within and among marshes, and over time, with tidal cycles and seasons. Wetland biomass serves as an important measure of spatiallyexplicit and temporally-variable changes that could ultimately impact wetland resiliency to climate change. Southern California’s coastal wetlands are especially threatened by climate change due to other anthropogenic forces like coastal squeeze by urban development. The combination of threats to these wetlands render them at-risk and call for improved understanding of how wetland response will vary across the region or within a given site as sea levels, precipitation, and temperatures change.
Remote sensing, fieldwork, and habitat response modeling approaches were combined to
gain a holistic perspective of wetland vulnerability and resiliency at scales ranging from plant response to regional overviews of habitat change. This approach also spans temporal scales to investigate climate-related changes over time by predicting future impacts, capturing current, highresolution patterns of biomass production, and uncovering decades of past patterns and drivers of wetland health. In chapter one, we develop a sea level rise (SLR) response model that addresses the scale‐dependent factors controlling SLR response and accommodates different levels of data availability to improve regional predictions of SLR vulnerability. In chapters two and three, we test the application of Unmanned Aerial Vehicles (UAVs) in remotely estimating aboveground biomass in coastal saltmarshes and how such hyperspatial insights can aid in satellite-based approaches to biomass estimation. Lastly, chapter four reveals temporal patterns of productivity in salt marshes spanning the region, allowing us to determine the importance of regional versus local climatic controls on saltmarsh productivity. By quantifying impacts across time and space, we gain a better understanding of how climate change will determine the fate of wetlands throughout southern California
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Evaluating the impact of California’s marine protected areas on kelp forest recovery from marine heatwaves
Full text linkForests of giant kelp (Macrosystis pyrifera) and bull kelp (Nereocystis luetkeana) in California are experiencing a number of stressors, including increased frequency of marine heatwaves and trophic disruptions that have led to high levels of grazing by sea urchins. These factors have contributed to population declines along the California coast. The State of California has a relatively large network of marine protected areas, and this protection may promote recovery of kelp forests by maintaining populations of predators that can keep urchin populations under control. However, the impact of MPAs on kelp forest recovery has not been examined across large scales. This information is particularly important as heatwave events are expected to occur more frequently. Using a long-term dataset of satellite-derived kelp canopy area estimates, we used BACI (Before-After-Control-Impact) analysis to examine whether the implementation of MPAs lead to increases in kelp abundance compared to reference sites. We identified a reference site for each MPA based on the dynamics of kelp abundance before the MPAs were implemented. We also analyzed kelp canopy recovery and resistance to the 2014-2016 marine heatwave inside and outside of marine protected areas. We characterized resistance and recovery of kelp by comparing kelp abundance during and after the heatwave to a baseline of kelp abundance during a 10-year pre-heatwave period (2003-2012). Our method for identifying reference sites enabled us to efficiently choose sites located outside MPAs that closely resembled the patterns and behavior of kelp observed within the MPA before its establishment. Our BACI analysis did not show a significant effect of MPA protection on kelp abundance over long time scales. However, using the sites from the reference finder, we did find evidence of greater recovery from the 2014-2016 heatwave inside of MPAs as opposed to the unprotected reference sites. These findings contribute to understanding the dynamics within a protected ecosystem and provide insight about kelp-forest recovery and resistance to temperature anomolies
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
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