1,720,987 research outputs found
Biogeochemical Cycling of Methylmercury in New York / New Jersey Harbor Estuary
No full textMonomethylmercury (MMHg) is a toxic byproduct of mercury (Hg) pollution in many coastal regions, and is of concern in the anthropogenically impacted (current and past) NY/NJ Harbor estuarine system. The general goal of this research is to investigate the biogeochemical factors affecting the production, distribution, and mobilization of MMHg from sediments in NY/NJ Harbor estuary.Final report to the Hudson River Foundation (HRF). HRF Fellowship: GF/01/04.Purpose: To investigate biogeochemical factors affecting the production, distribution and mobilization of MMHg from sediments in NY/NJ Harbor estuary
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
Biogeochemical Cycling of Methylmercury in New York / New Jersey Harbor Estuary
No full textMonomethylmercury (MMHg) is a toxic byproduct of mercury (Hg) pollution in many coastal regions, and is of concern in the anthropogenically impacted (current and past) NY/NJ Harbor estuarine system. The general goal of this research is to investigate the biogeochemical factors affecting the production, distribution, and mobilization of MMHg from sediments in NY/NJ Harbor estuary.Final report to the Hudson River Foundation (HRF). HRF Fellowship: GF/01/04.Purpose: To investigate biogeochemical factors affecting the production, distribution and mobilization of MMHg from sediments in NY/NJ Harbor estuary
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
Investigating Toxicological Effects of Short-Term Resuspension of Metal-Contained Freshwater and Marine Sediments
Full text linkSediments in navigation-dominated waterways are frequently contaminated with a wide range of chemicals and are subject to resuspension events. There is little information documenting whether adverse ecological effects result from these resuspension of contaminated sediments. I studied the mobilization of metals (Zn, Cu, Cd, Pb, Ni and Cr) during resuspensions of freshwater and marine sediments and whether or not this resulted in toxicity to organisms. Sediment resuspension events were simulated using sediment flux exposure chambers (SeFEC) to resuspend metal-contaminated sediments from Lake DePue (IL) and two Portsmouth (ME) Naval Shipyard sites. Various resuspension events of environmentally relevant suspended particulate matter concentrations (200-1,000 mg/L) were performed. Short-term resuspension events (4 h) resulted in metal- and sediment-specific mobilization. Toxic effects on organisms were limited (Hyalella azteca and Daphnia magna survival, Neanthes arenaceodentata survival, growth and body burden, Pyrocystis lunula bioluminescence) over both the time period of the exposure and during a 4 to 10-d post-recovery period. I conclude that sediment resuspension events at relevant suspended particulate matter concentrations do not release large amounts of dissolved metals, most likely due to the oxidation of reduced iron, manganese and amorphous sulfide species and subsequent readsorption to iron and manganese oxides and organic matter, therefore limiting organisms’ exposure and effects. The redeposition of suspended sediments and associated metal speciation changes, from sulfides to oxides, has the potential to increase metal bioavailability and toxicity to sensitive benthic organisms. While the release of dissolved metals are low, resuspension events still pose the risk of causing toxic responses due to mobilization of contaminated sediments.Master of Science (MS)Natural Resources and EnvironmentUniversity of Michiganhttp://deepblue.lib.umich.edu/bitstream/2027.42/99548/1/KJF_Thesis_draft_080913_FINAL.pd
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
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