1,720,989 research outputs found
Estimating Particle Size in the Ocean from High-frequency Variability in In-situ Optics
Get PDFDuring this 3-year NESSF fellowship and seven-month no-cost extension, I published two papers as first author (Briggs et al. 2011; Briggs et al. 2013) and two papers as a co-author (Alkire et al. 2012; Cetinic et al. 2012). I am also co-author on one submitted paper and have worked on five additional papers that are in preparation (two as first author). I have given talks at four international oceanographic conferences: The 2012 and 2014 Ocean Sciences Meetings in Salt Lake City and Honolulu, the 2012 Ocean Optics meeting in Glasgow, Scotland, and the 2013 Liege Colloquium in Liege, Belgium. I also gave a 45-minute seminar at the Laboratoire d\u27Oceanographie Villefranche-sur-mer in France. In 2013 , I received the University of Maine’s NSFA Graduate Research Excellence Award in recognition of the research conducted under the NESSF fellowship. In addition to my research-related accomplishments, I successfully completed five graduate-level classes (paid for with NESSF funding) and passed my qualifying exams to ascend to PhD candidacy.
My research focused on advancing methods for estimating two important oceanographic quantities - particle size and primary productivity (PP) - from autonomous platforms. The aim of my research is to pave the way for much greater global coverage of size and productivity estimates, both for direct application to ecological and biogeochemical studies and to validate and perhaps calibrate the growing number of global ocean color-based particle size and PP inversions
Export and mesopelagic particle flux during a North Atlantic spring diatom bloom
No full textSpring diatom blooms are important for sequestering atmospheric CO2 below the permanent thermocline in the form of particulate organic carbon (POC). We measured downward POC flux during a sub-polar North Atlantic spring bloom at 100 m using thorium-234 (234Th) disequilibria, and below 100 m using neutrally buoyant drifting sediment traps. The cruise followed a Lagrangian float, and a pronounced diatom bloom occurred in a 600 km2 area around the float. Particle flux was low during the first three weeks of the bloom, between 10 and 30 mg POC m?2 d?1. Then, nearly 20 days after the bloom had started, export as diagnosed from 234Th rose to 360–620 mg POC m?2 d?1, co-incident with silicate depletion in the surface mixed layer. Sediment traps at 600 and 750 m depth collected 160 and 150 mg POC m?2 d?1, with a settled volume of particles of 1000–1500 mL m?2 d?1. This implies that 25–43% of the 100 m POC export sank below 750 m. The sinking particles were ungrazed diatom aggregates that contained transparent exopolymer particles (TEP). We conclude that diatom blooms can lead to substantial particle export that is transferred efficiently through the mesopelagic. We also present an improved method of calibrating the Alcian Blue solution against Gum Xanthan for TEP measurements
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Improvements to Sampling from the Research Vessel Ira C
Get PDFThe University of Maine\u27s Darling Marine Center is awarded a grant to equip the 42-ft Ira C., the Center\u27s largest vessel, with a well instrumented CTD, including optical sensors and a small array of sampling bottles plus a winch with conducting cable so that CTD work from the Ira C. no longer needs to depend on users bringing their own CTD and lowering by hand. This proposal is to expand the environments and variables within effective reach of the University of Maine\u27s marine laboratory, the Ira C. Darling Marine Center (the Center) in midcoast Maine. The Center is within a day\u27s access by sea of an unparalleled range of marine environments on the East Coast depths from intertidal to \u3e 200 m and substrates from rocks to gravels to sand to mud. Environments within a day\u27s reach include the coastal seas with the strongest latitudinal thermal gradients along the U.S. coasts and the largest seasonal range of temperatures. It includes the outflows of Maine\u27s three rivers with the greatest volumetric flows, the Penobscot, the Kennebec and the Saco as well as several of the smallest. It is ideally poised to help investigators do process-, ecosystem- and species-level studies of Gulf of Maine and estuarine environments and biota in the context of environmental variability and climate change. Broader Impacts: The Center has an outstanding group of faculty and scientists including some distinguished emeritus professors. The center also has a remarkable record of visiting scientists and students, drawing researchers from all over the U.S. and internationally. Clearly an attraction is the facilities (including a first rate library) and access to a unique spectrum of marine environments, biogeographically diverse populations of marine organisms, etc. The need for the proposed improvements is easily recognized. The authors describe how the facility is used for education and how the upgrades will increase users for both science and for education. The Center currently has NSF COSEE support, and the author proposes to leverage off this program for K-grey teacher training, undergraduate, and graduate and \u27world-class\u27 web-based educational outreach
- …
