1,721,153 research outputs found
Avgangsutstillingen 2003
No full textStudenter: Kjersti Andvig, Helene Fredriksen, Lina Viste Grønli, Ellen Holtskog, Martin Jørgensen, John Harald Knutsson, Hjørdis Kurås, Håkon Nakken, Anders Adler Simonsen, Morten Slettemeås, Helene Sommer, Andreas Tellefsen, Marte Torshaug
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
Investigation of the cleaning effect of Stokbæk okkersø
No full textThis project treats the problem regarding an in increased amount of ferrous iron in aquatic environments inwestern Denmark. The problem is mainly due to oxidation of pyrite caused by farmers lowering the watertable, when draining arable land for cultivation as well as straightening of creeks and rivers.The study focuses specifically on establishing a way of measuring the actual residence time of water, in lakesmade for ocher cleaning, as well as describing the status of Stokbæk okkersø, regarding the water quality.This is done in order to find out, if there is a potential for establishing living conditions for aquatic life, suchas trout. As the biggest threat is the ferro iron, the cleaning effect is examined, by comparing water from theinlet to that of the outlet.An examination of Stokbæk creek, was performed downstream from the lake in order to find out, if thelocation of the lake secures, that all point sources of ferrous iron is lead through the lake.At last, testing of the lake sediments is carried out, in order to find out, whether the sediment can be usedas fertilizer on fields, or whether the amount of heavy metals excess the amounts, which can be used for thatpurpose. At the same time any potential patterns in sedimentation is sought.The main findings of the study have been obscured, by the fact, that the autumn of 2019 has brought thelargest amount of precipitation on record, so that the flow through the lake, exceeds its capacity. It ishowever concluded, that under the given conditions, the cleaning effect of the lake on ferrous iron is at 18%,which is among the lowest observed values since the establishment of the lake.By applying small amounts of sodium chloride to the inlet, and measuring the differences of conductivity, anapproximate residence time, was found to be approximately 5 hours. This low value corresponds well to thelow cleaning effect and is low compared to the theoretically calculated residence time of 7 hours 40 minutes.When analyzing the iron content in in- and outlet by ICP, a negative cleaning percentage was measured. Thisobservation was made on water samples collected shortly after an intense downpour. There were indicationsof a possible inlet of water from a drainpipe, with a high iron content, that may have been the cause of thenegative cleaning. No direct measurements were performed on the inlet of drain water, as the inlet waslocated under the water table.The quality of the data obtained from sediment samples was not good enough to find any significantdifferences between the sedimentation contents in different parts of the lake. The chosen significance levelwas 0.05. There were, however some indications, that there is a difference between the amount ofprecipitated metals between the northern and southern part of the lake.While investigating possible point sources of iron downstream from the lake, 3 sources was located. Thisindicates the need of either blocking off the sources or making an additional cleaning facility furtherdownstream
Graphene Oxide/Titanium Dioxide Membranes
No full textDuring recent years, graphene has been studied intensively because of itsunique characteristics, making it usable for a variety of applications. In order to produce graphene, it is rst necessary to oxidize graphite to grapheneoxide and then reduce it to graphene. Tests have shown that graphene oxidecould possibly be used as a membrane material for water treatment, as itsoxygen-rich functional groups provide high hydrophilicity, while the graphenestructure ensures excellent selectivity. A major limitation in membrane ltration is the fouling phenomena, which is why TiO2 could be of interest inmembrane usage. TiO2 is used to clean surfaces via its photocatalytic properties.The purpose of this project was therefore to investigate graphene oxide asa membrane material and incorporate TiO2. Dierent graphene oxide syntheses were tested and dierent GO/TiO2 ratios were also tested. The thermal treatment process for reducing graphene oxide was also tested in orderto nd optimal reduction time and temperature for stable membranes. Thethermal reduction was evaluated using X-ray diraction (XRD), dierentialscanning calorimetry (DSC), thermogravimetric analysis (TGA) and Fouriertransform infrared spectroscopy (FT-IR). The surface characteristics were examined before and after UV-C irradiation, in order to see if the TiO2 providedsignicant changes. Surface characteristics were analyzed using drop shapeanalysis (DSA), zeta potential measurements and FT-IR. The vapor permeance of the membranes produced was tested with water, ethanol and hexane.Scanning electron microscopy (SEM) was also done in order to see any potential membrane damage as a result of UV-C irradiation. The membrane surfacecharacteristics and permeance were compared to that of two commercial membranes; Alfa Laval NF99HF and NFT50.By comparing the dierent syntheses via XRD and FT-IR, it was concludedthat the Tour's method was best suited for further experiments. From the reduction experiments done, it was found that reduction at 140◦C for one hourproduced the most stable and hydrophilic membranes. The optimal GO/TiO2ratio was found to be in the range of 15:1 - 30:1. The TiO2 added to thegraphene oxide membranes was found to signicantly enhance hydrophilicityand anti-fouling properties, caused by the formation of hydroxyl groups at thesurface. SEM tests were inconclusive as to whether the membrane is damaged by the photocatalytic activity of TiO2. The water vapor permeance wasfound to be close to unimpeded and at least 55% higher than the commercialmembranes teste
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