1,721,054 research outputs found
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
Electrospinning and morphology characterization of polymer blend nanofibers
Full text linkThis PhD explores the potential of blend electrospinning for the production of nanofibers containing a synthetic component, a natural component and/or well-immobilized pH-sensitive dye molecules for biomedical and colorimetric sensor applications. Within this investigation, focus is given to process stability and scalability using a solvent system with limited toxicity, namely acetic acid/formic acid, and subsequent analysis of the obtained nanofibers. A few model systems were selected, with polyamide-6 and polycaprolactone representing well-processable synthetic polymers, gelatin and chitosan representing the two major biopolymer classes and a few azo dyes representing the vast range of applicable pH-indicators
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
Bisphenol A based polyester binder as an effective interlaminar toughener
No full textBisphenol A based thermoplastic polyesters are commonly used in the industry as binders, or tackifiers, to produce cost-saving preforms in Liquid Composite Moulding processes such as Vacuum Assisted Resin Transfer Moulding (VARTM). However, it is often reported that the presence of these polyesters has a detrimental effect on the mechanical properties of the resulting composite laminates. In contrast, this study shows that interlaminar toughness can be increased without negatively affecting other properties by coating the reinforcing plies with a bisphenol A based thermoplastic polyester if some precautions are taken in mind. The polyester was added to an epoxy resin in order to study its effect on the thermophysical properties and fracture toughness of the bulk epoxy. The polyester molecules acted as a plasticizer for the epoxy resin when the polyester was added in low amounts. This increased the bulk fracture toughness of the epoxy resin by 30%. Polyester modified glass/epoxy laminates were produced and tested for Mode I interlaminar fracture toughness and flexural properties. The increased toughness of the epoxy matrix led to a 60% increased Mode I interlaminar fracture toughness of the laminates, without negatively affecting flexural stiffness and strength of the laminates
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
Poly ( e-caprolactone) nanocomposites : study of crystallization behavior
No full textConsulta en la Biblioteca ETSI Industriales (8128)[EN] Poly(e-caprolactone) (PCL) is a biodegradable synthetic resin which ¿ besides
relatively high crystallization rate, fair mechanical performance and good processability ¿
exhibits a high degree of biocompatibility. Resins based on aliphatic polyesters such as
PCL find application as compost bags as well as in a number of medical products. Its use
in additional fields is however restricted due to moderate barrier properties and low
modulus. A simple approach to overcome these limitations consists of incorporating low
amounts of nanosized filler particles.
Differential scanning calorimetry (DSC) is used to investigate the influence of
moisture on the isothermal crystallization behavior of polycaprolactone samples. It can be
concluded that a dry sample starts to crystallize before the wet samples.
An advanced thermal analysis methodology (Modulated Thermal Differential
Scanning Calorimetry, MTDSC) is employed for the characterization of PCL
nanocomposites. During quasi-isothermal crystallization, the presence of high aspect
ratio nanofillers strongly affects the amount of crystalline-amorphous interface, thus
increasing the recorded excess heat capacity (Cp
excess). The influence of nanofiller loading
on the melting behavior after quasi isothermal crystallization is also studied.
Experiments to study crystallization kinetics are conducted with DSC using different
cooling rates. It is observed that as the rate of cooling increased the crystallization
temperature (Tc) shifts to lower temperatures. However, no significant difference in the
enthalpy of crystallization values is observed.
The PCL nanocomposites used in this work were prepared by melt mixing techniques
(extrusion). DSC is used to study the influence of this process on the isothermal
crystallization of PCL. It is observed that the extruded samples start to crystallize earlier
than the granule sample as is. After isothermal crystallization experiments at different Tc, the melting behavior of
the samples is recorded with DSC. With increasing the isothermal crystallization
temperature, the melting peak moves to higher temperatures for PCL samples. Most of
the samples prepared in this thesis were made using one PCL batch. To study the
influence of the molecular weight on the thermal properties (crystallization temperature,
enthalpy and melting temperature) obtained via DSC measurements, PCL batches with
different molecular weights are used. No significant differences in glass transition
temperature (Tg) values are obtained.García Sanchis, C. (2009). Poly ( e-caprolactone) nanocomposites : study of crystallization behavior. https://riunet.upv.es/handle/10251/33570.Archivo delegad
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