1,720,958 research outputs found
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
Produced water treatment using microbial desalination cells
No full textA Master of Science thesis in Chemical Engineering by Apoorva Goel entitled, “Produced water treatment using microbial desalination cells”, submitted in May 2018. Thesis advisor is Dr. Naif Darwish and thesis co-advisor is Dr. Ahmed Aidan. Soft and hard copy available.Globally, 250 million barrels of produced water is generated daily for extracting 80 million barrels of oil. Having a highly variable composition and no economic value, produced water presents serious environmental problems. While the treatment of produced water is of paramount concern, existing desalination technologies are highly expensive and energy-intensive leading to great investments by oil industries. Microbial desalination cells (MDC) provide a promising alternative through their potential for negligible energy input, use of low-cost resources, low waste production, and electricity generation. However, MDC is a relatively new technology and its application in industries is limited by its low desalination efficiency and pH instability. This research investigates the effect of various factors on the performance of MDC employing Saccharomyces cerevisiae yeast as electron generating microorganisms. Two mediators, methylene blue, and menadione are used as electron promoters to shuttle the electrons from the yeast cells to the anode electrode. In particular, a two-level partial factorial design is implemented where, MDC desalination efficiency is investigated at two (low/high) levels of three input factors: aeration in anolyte (aerobic/ anaerobic), hydrophilic mediator concentration (0.5– 2 mM), and concentration of Total Dissolved Solids (TDS) in produced water (20– 40 g/l). Acquired experimental data are statistically analyzed using single effect and interaction plots. In addition, several other operating parameters and configurations are investigated in order to achieve optimum conditions for best performance. These include aeration rates in the anode and cathode chambers, the concentration of lipophilic and hydrophilic mediators, the pH of the anolyte solution, the use of activated carbon granules, and the repeated batch operation. Moreover, an MDC unit is operated at the optimized conditions where it resulted in 36% desalination after 72 hours. The study revealed that the operation of repeated batch cycles was the most effective among other parameters in improving desalination efficiency of MDCs. Furthermore, the factorial design study concluded that produced water TDS has the highest single effect on MDC performance and that there is a significant interaction between all three input factors employed in the factorial design.College of EngineeringDepartment of Chemical EngineeringMaster of Science in Chemical Engineering (MSChE
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Engineering ureolytic bacteria for improved microbially induced calcium carbonate precipitation
No full textMicrobially induced calcium carbonate precipitation (MICP) is influenced by various biological and chemical factors. The objective of this study was to understand the biological aspects of Sporosarcina pasteurii DSM33, a model ureolytic bacterium, and engineer it to achieve improved performance of MICP. However, genetic engineering tool for S. pasteurii is unknown, due to which it is difficult to engineer this bacterium.
To understand the underlying biological mechanisms behind MICP and potential targets for the genetic engineering, genome analysis of 45 genomes representing Sporosarcina genus, was carried out. Among studied Sporosarcina genomes, 40 were found to have urease genes while 6 genomes were found to have carbonic anhydrase genes depicting the importance of this genus in MICP applications. Further, prospective targets for genetic manipulation such as restriction modification genes, mobile genetic elements and quorum sensing associated genes were analysed. S. koreesnis Q1 and Sporosarcina sp. BP05 were found to be enriched in potential genes that can facilitate the conjugative HGT. Since, genes related to plasmid replicon or conjugative transfer were not detected in S. pasteurii strains, a bioengineering-based approach was adopted to modify the S. pasteurii DSM33.
Polydopamine coating which is known for its strong adhesive and biocompatibility was selected for modifying the surface of the S. pasteurii bacterium at nanoscale. The polydopamine coating around S. pasteurii cells resulted in a cell-in-shell structure which showed urea hydrolysis rate of 1250 ± 11 mM/ hr in comparison to uncoated cells with a urea hydrolysis rate of 277 ± 6 mM/ hr. The mechanism of enhanced urease activity was deduced via confocal imaging, molecular techniques and flow cytometry and it was concluded that enhanced permeabilization of cells by polydopamine interaction resulted in increased accessibility of the urease enzyme. Since Ca2+ acts as inhibitor to urease activity, impact of polydopamine coating in protection against Ca2+ inhibition was studied using urease activity assays and bio-consolidation experiments. The strength and water permeability of sand column bio-consolidated by polydopamine coated S. pasteurii were improved in comparison to the sand columns bio-consolidated by uncoated cells. Overall, polydopamine coated cells were found to be effective in increasing mechanical properties of bio-consolidation process.Doctor of Philosoph
- …
