1,720,953 research outputs found
A geochemical baseline study of giant kelp (macrocystis pyrifera) at the kelp blue farm to assess carbon sequestration potential
No full textA thesis submitted in fulfilment of the requirements for the Degree of Master of Science (Chemistry)The raised levels of carbon dioxide (CO2) in the earth’s atmosphere have contributed to global
climate change, which has adversely affected a wide range of individuals, communities, and
organizations. One of the ways to mitigate climate change is to grow a huge amount of kelp
forests that can absorb carbon dioxide from the atmosphere and sequester it in the deep ocean.
To grow these forests, the right biogeochemical conditions (temperature, nutrients, oxygen,
salinity, pH, trace metals and ions) within the ocean is vital to assess the sequestration potential
and the impacts on the ocean health. This study aimed at monitoring the biogeochemical
changes at the proposed Kelp Blue farm and surrounding areas further away from the farm.
This study also aims to create a baseline of the chemical composition of the farm and Lüderitz
areas, which has not been done before. Using the results obtained from the study, the potential
of the cultivated giant kelp to sequester CO2 will be evaluated. This study measured the
geochemical parameters using both in-situ probes and laboratory analyses at 10 different
locations in Lüderitz (both offshore and coastal): offshore (within the Kelp Blue Pilot project
farm, upstream of the farm in the Dumfudgeon rocks, downstream of the farm at Boot Bay and
further south of Lüderitz at the Halifax island) and the coastal areas which are adjacent to the
offshore study areas including at coastal site of Guano Bay which is about 17 km and the coastal
area of Grossebucht which is about 20 km south the town of Lüderitz as another control site.
This study also collected sediment samples at these offshore sites including further north of
Walvis Bay at the different latitudinal transects. The sediments were analysed for trace metals
by using a portable XRF and for carbon content by LOI (Loss on Ignition) method. Another
geochemical analysis done was the titrimetric method to CO2 determination of seawater by
using NaOH as a titrant the end points were determined. The concentrations of nutrients
(phosphates and nitrites) in seawater samples were determined by adding them to a 10 mL
cuvette, which had been zeroed first. A specific nutrient reagent was then introduced, and using
ii
prescribed sample preparation techniques, a spectrophotometer was employed to measure the
concentrations of the nutrients in µg/L and mg/L. The geochemical parameters changed in
relation to the seasonality and geographical positioning. In a season when the upwelling system
was strong, the concentration of nutrients, acidity and the value of the pH, salinity, other
geochemical parameters increased more, compared to other seasons and the further southern
sampling sites resembled to that of the Southern Benguela Upwelling System (SBUS). Higher
concentrations of phosphates (614 µg/L) were found in areas close to the islands. This is due
to the presence of guanos. These remarkable long duration geochemical measuring results
shows that the cultivated kelp can co-exist with other natural existing kelp beds in this
ecosystem, and they can thrive more predominantly in season of great influx of nutrients during
the season of strong winds. With a dynamic Benguela upwelling eastern boundary, these kelp
forests have an enormous potential to grow more and will function as carbon absorber and
eventually sequester more carbon when cultivated at larger scale. To quantify the carbon
sequestration potential of these giant kelps, there are other areas to be investigated such as
developing a sediment carbon baseline using isotopic analyses, lipid biomarkers, identifying
sediment hotspots where the kelp will be deposited, developing a carbon dioxide removal
model and geochemical dispersion models. All these other areas will be developed from the
baseline being developed by this study. This study recommends that a continuous and rigorous
monitoring of the water and sediment geochemical changes be done as the kelp forest grows
and as the scale of operation expand
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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