1,720,970 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
Infulence of diferent amino acids on spontanouse precipitation of calcium phosphates
Get PDFMeđudjelovanje malih organskih molekula i/ili makromolekula s anorganskim kristalima važno je za razumijevanje procesa taloženja u prirodi. Između različitih biominerala, kalcijevi fosfati privlače posebnu pažnju zbog uloge u biološkoj i patološkoj mineralizaciji i industrijskim procesima. U novije vrijeme, istraživanja utjecaja aditiva na nastajanje kalcijevih fosfata uglavnom su usmjerena na proteine. Iako su opći principi tih međudjelovanja poznati, uloga pojedinih aminokiselina nije još do kraja razjašnjena.
Cilj ovoga rada je istraživanje utjecaja aminokiselina koje pri fiziološkim uvjetima imaju bočne ogranke različitih naboja: fenilalanina (nenabijen), asparaginske kiseline (negativno nabijen), asparagina (polaran, nenabijen), serina (polaran, nenabijen) i lizina (pozitivno nabijen).
Napredovanje taloženja kalcijevih fosfata praćeno je potenciometrijski, što je omogućilo određivanje vremena indukcije. Nastali talog analiziran je infracrvenom spektroskopijom s Fourierovom transformacijom, pretražnom elektronskom mikroskopijom, transmisijskom elektronskom mikroskopijom i difrakcijom rendgenskih zraka na praškastom uzorku.
Dobiveni rezultati ukazali su da utjecaj aminokiselina na svojstva kalcijevih fosfata ovisi o naboju njihovog bočnog ogranka.Mechanisms of interaction between soluble small organic molecules and/or macromolecules with inorganic crystals are of major importance for crystallization processes in nature. Among different biogenic crystals, calcium phosphates attract attention due to their role in the normal and pathological mineralization, as well as in industrial processes. Recent investigations of the influence of additives on the formation of calcium phosphates are mostly focused on protein and their building blocks, amino acids. Althought general principles of these interactions are known, the role of specific amino acids is still unclear.
The aim of this research was to investigate the influence of amino acids with side chains of different properties at physiological conditions: phenylalanine (uncharged, hydrophobic), aspartic acid (negatively charged), arginine (uncharged, polar), serine (uncharged, polar) and lysine (positively charged).
The progress of precipitation was followed potentiometrically, which enabled determination of induction time. Fourier transform infrared spectroscopy, powder x - ray diffraction, scanning and transmission electron microscopy were used for characterization of the precipitates.
Given results show the influence of amino acids on properties of calcium phosphates. The obtain resultes show that the infuence of amino acids on calcium phosphates’ properties dependes on the charge of their side chain
Biomimetic synthesis and characterization of calcium phosphate and titanium nanomaterials nanocomposites
No full textKompoziti kalcijevih fosfata i titanatnih nanomaterijala, zbog komplementarnih svojstava komponenti, privlače sve veću pažnju kao napredni materijali za regeneraciju čvrstih tkiva. Dosadašnja istraživanja takvih nanokompozita većinom su usmjerena na prekrivanje nanostrukturiranih TiO2 površina kalcijevim fosfatima kako bi se poboljšala njihova bioaktivnost. Cilj ovog doktorata sustavno je istražiti biomimetsko nastajanje nanokompozita kalcijevih fosfata i titanatnih nanomaterijala u uvjetima što bližim fiziološkim. Uspoređena su dva načina sinteze nanokompozita, inkubiranjem u simuliranoj tjelesnoj tekućini te taloženjem iz suspenzije. Također je određen utjecaj biološki aktivnih molekula, albumina iz goveđeg seruma (BSA) i kitozana, na nastajanje nanokompozita. Kako bi se dobio uvid u ponašanje sintetiziranih kompozita in vivo, određeni su parametri adsorpcije i vezanja albumina iz seruma, proteina koji se pri ugradnji prvi veže na površinu implantata.Dobiveni rezultati ukazuju da je taloženje brza i svestrana metoda priprave nanokompozitakalcijevih fosfata i titanatnih nanomaterijala u kojoj se, neovisno o vrsti titanatnih nanomaterijala, ne mijenja sastav niti struktura kalcijevih fosfata. Takvi nanokompoziti pokazuju poboljšana svojstva adsorpcije proteina u odnosu na čiste kalcijeve fosfate, što ukazuje na njihov potencijal u biomedicinskim primjenama.Calcium phosphates and TiO2 nanomaterials composites are attracting attention as advanced materials for bone regeneration due to the complementary properties of the components. Current studies of such composites focus on coating TiO2 nanostructures with calcium phosphate layers to improve their bioactivity. The aim of this doctoral thesis was to systematically investigate the biomimetic preparation of nanocomposites based on calcium phosphate and titania nanomaterials under physiological conditions.Two methods of nanocomposite synthesis were compared, immersion in simulated body fluid and precipitation from a suspension. In addition, the influence of biologically active molecules, bovine serum albumin and chitosan, was determined. To evaluate the in vivo behavior of the prepared composites, the adsorption and binding parameters of serum albumin were determined, since this protein is the first to interact with the implant materials after implantation.The obtained results showed that precipitation from solution is a rapid and versatile method for preparing TiO2 and calcium phosphate composites, in which no changes in the composition or structure of the calcium phosphate phase depending on the type of titanium nanomaterials was observed. Such composites exhibit improved protein adsorption properties, indicating their potential for biomedical applications
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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