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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
An analytical and breeding study on fatty acids in summer turnip rape
No full textvokkirjasto Aj-KDiss. :Helsingin yliopistoTutkimus kevätrypsin (Brassica campestris L. var. annua) rasvahappojen analytiikasta ja jalostuksest
Tutkimus kevätrypsin (Brassica campestris L. var. annua) rasvahappojen analytiikasta ja jalostuksesta
Get PDFThe fatty acid composition of the seed oil of summer turnip rape (Brassica campestris L. var. annua) was investigated by gas liquid chromatography (GLC). The reliability of conventional sampling methods in capillary GC was compared with that of the new on column and PTV (programmed temperature vaporizer) techniques, with particular reference to the determination of fatty acid variation. In order to develop new, well-adapted turnip rape strains with improved oil quality, a breeding programme for a higher linoleic acid content, based on individual plant selection, was performed in 1978—85. The results showed that the conventional sampling techniques involving sample transfer to a hot injector were very unreliable as regards precision and accuracy. This was especially the case in the determination of trace fatty acid levels. The PTV methods with splitless and solvent split mode were as precise as cold on-column injection. The PTV sampling modifications, which are all superior to classical techniques, were even more suitable for routine analyses than on-column injection, where several restrictions are met. The analytical error with PTV for most of the compounds represented less than 1 % of the variation found for fatty acids within a turnip rape variety. The breeding experiments indicated that the level of linoleic acid can be increased under open-pollinated conditions in the field without affecting the α-linolenic acid content. The greenhouse conditions, on the other hand, were found to have a considerable environmental influence on the variation of these compounds, resulting in no response to linoleic-acid selection. In field trials, several strains with yields comparable to the varieties commonly cultivated in Finland were selected with a higher linoleic acid content (up to25 %). Most of them also contained no erucic acid. The new evidence concerning its beneficial physiological effects indicate that rapeseed oil should be considered as a serious alternative among sources of essential fatty acids. Such aspects should also be taken into account in future breeding of rapeseed fatty acids.Kotimainen rypsiöljy on viimeisen kymmenen vuoden aikana saanut yhä tärkeämmän aseman elintarviketeollisuuden raaka-aineena. Nykyisistä rypsilajikkeista saatava öljy on varsin kilpailukykyistä, sillä erityisesti erukahappopitoisuuden suhteen laatuvaatimukset meillä ovat varsin tiukat. Viljelyä ei voida kuitenkaan suuressa määrin lisätä, sillä jalostavan teollisuuden mahdollisuudet korvata tuontiöljyjä kotimaisella raaka-aineella ovat suhteellisen rajoitetut johtuen ensisijaisesti rypsiöljyn alhaisesta linolihappopitoisuudesta. Tämän tutkimuksen tarkoituksena oli yksilövalintaa apuna käyttäen kohottaa kevätrypsin siemenöljyn linolihappopitoisuutta sekä lutkia valinnanvaikutuksia rasvahappokoostumukseen ja satoisuuteen. Tutkimuksessa verrattiin edelleen perinteisten ja uusimpien kaasukromatografisten menetelmien luotettavuutta rasvahappoanalytiikassa ja pyrittiin optimoimaan jalostustyöhön parhaiten soveltuva analyysitekniikka. Jalostuskokeet tehtiin Hankkijan kasvinjalostuslaitoksella Hyrylässä vuosina 1978—85 kanadalaista alkuperää olevasta kevätrypsiaineistosta. Linolihappolinjojen lopullinen karsinta suoritettiin satoisuuden perusteella. Vapaapölytteisissä pelto-oloissa tehdyt jalostuskokeet osoittivat, että linolihappotasoa on mahdollista kohottaa yksilövalinnalla vaikuttamatta kuitenkaan toisen monityydyttämättömän komponentin, α-linoleenihapon, määrään. Parhaat valintalinjat sisälsivät linolihappoa n. 25 %, minkä lisäksi useat olivat erukahapottomia ja satoisuudeltaan nykyisten lajikkeiden veroisia. Kasvihuoneolosuhteiden todettiin sitä vastoin aiheuttavan huomattavaa lisävaihtelua, eikä valinnan vaikutusta linolihappotasoon voitu osoittaa. Pyrittäessä edelleen kohottamaan rypsiöljyn linolihappopitoisuutta saattaisi alhaisen α-linoleenihappotason huomioiminen yksilövalinnassa samanaikaisesti olla merkityksellistä linolihappovalinnan tehostamiseksi. Alhaisesta monityydyttämättömien rasvahappojen määrästä huolimalta rypsiöljyllä on todettu olevan varsin edulliset fysiologiset vaikutukset eritoten kolesterolitasoon. Tässä valossa on rypsiöljyä pidettävä vakavasti otettavana vaihtoehtona välttämättömien rasvahappojen lähteenä, mikä myös tulevaisuudessa on huomioitava rasvahappokoostumusta jalostettaessa
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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