1,720,972 research outputs found
Bio-based food packaging films: influence of formulation and processing on functional properties
Full text linkBio-based nanocomposite films were produced by adding different types of nanoclays in a poly(lactic) acid polymer matrix and compared with the unfilled materials. A suitable coating made of pig skin gelatin was applied on the surface of poly(lactic)acid nanocomposite film U/C30B in order to produce a bio-based bi-layer flexible film with improved oxygen-barrier properties.Sono stati realizzati film nanocompositi, ottenuti da fonte rinnovabile, attraverso l'incorporazione di nanoargille in una matrice polimerica a base di acido polilattico e confrontati con i materiali privi di nanoargille. E' stato applicato un coating costituito da gelatina di pelle di maiale sulla superficie del film nanocomposito a base di acido polilattico U/C30B, al fine di realizzare un bi-layer flessibile ad alta barriera all'ossigeno
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
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
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
Combination of high-pressure treatment, mild heating and holding time effects as a means of improving the barrier properties of gelatin-based packaging films using response surface modeling
No full textThe optimum combination of high-pressure (HP), mild temperature application and holding time on pigskin-derived, gelatin-based, film-forming solutions to improve the barrier properties of packaging films was determined using response surface methodology. Results showed that the variable response oxygen transmission rate (OTR) decreased significantly using a combination of temperature, time, and the interaction between pressure and time. The determined optimum conditions to minimize the OTR were high pressure treatment (600 MPa) and holding time (30 min), while maintaining the temperature at 20.5 °C. In parallel, films obtained at the optimum conditions (OPT) were characterized for structural, thermal, mechanical, water vapor transmission rate (WVTR) and color properties. OPT films were significantly affected by mechanical (TS), thermal (Tm), WVTR properties and redness a∗values compared to untreated control samples. Overall, a combination of HP, mild temperature and holding time on film-forming solutions showed interesting potential in altering film characteristics, especially in the enhancement of barrier properties. Industrial relevance Results obtained in this study are of considerable importance for the film development and the shelf-life of food products packaged in films treated with the methodology used in the current work. The oxygen permeation through the film packaging can lead to a degradation of the quality attributes of the food products influencing microbial development as well chemical and enzymatic degradation pathways. Oxygen is responsible for oxidative rancidity of unsaturated fats with the development of undesirable flavors and aromas and a loss in Vitamin C. The package oxygen permeability plays a key role in affecting the internal partial pressure of a packaging system and for this reason the oxygen permeability is probably the property mostly tested for the different packaging materials. Within this contest, the industrial relevance of this study is significant, since the results showed a potential application of a combination of high-pressure, mild treatment and holding time to increase barrier properties in bio-sourced packaging films thus extending the shelf-life of foodstuffs
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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