1,720,956 research outputs found
Dépôt en couche mince d'un multi-matériau à la surface de particules solides : application à l'enrobage de particules alimentaires
Full text linkCette étude est consacrée à l'élaboration de vernis d'enrobage composites constitués d'une fine dispersion de matériau hydrophobe dans une matrice de polymère. Ce type de matériau est appliqué à la surface de particules alimentaires, grâce à un procédé de pulvérisation en lit fluidisé, afin d'assurer la protection de ces particules vis-à-vis d'atmosphères humides. Nous avons développé un protocole de formulation, des vernis d'enrobage et des outils de caractérisation des dispersions liquides mais également des vernis secs sous forme de films minces. Nous avons étudié l'influence des paramètres liés au protocole de formulation et à la composition sur la stabilité de la dispersion, sur les propriétés d'usage des films d'enrobage secs mais également sur les interactions entre les différents constituants. A partir de l'ensemble de ces résultats, deux formulations ont été retenues. Afin d'étudier l'influence des conditions séchage sur les propriétés des films d'enrobage, nous avons conçu une veine de séchage convectif. Les résultats ont montré que la morphologie et les propriétés des films secs sont essentiellement pilotées par la période de séchage à vitesse décroissante, lorsque la cinétique d'évaporation du solvant est limitée par la diffusion de celui-ci à travers le film de vernis. De plus, nous avons observé que l'augmentation de la température de séchage, notamment pour des températures de séchage proche de la température de fusion des composés fusibles des vernis (40°C pour le PEG 1500 et 55°C pour l'acide stéarique), induit des transformations morphologiques importantes des films. L'apparition de cette nouvelle morphologie provoque une amélioration notable des possibilités de déformation des films secs sans modifier leurs propriétés barrières
Thin layer coating of the surface of solid particles with a composite material : application of the coating of vitamin forms
No full textCette étude est consacrée à l'élaboration de vernis d'enrobage composites constitués d'une fine dispersion de matériau hydrophobe dans une matrice de polymère. Ce type de matériau est appliqué à la surface de particules alimentaires, grâce à un procédé de pulvérisation en lit fluidisé, afin d'assurer la protection de ces particules vis-à-vis d'atmosphères humides. Nous avons développé un protocole de formulation, des vernis d'enrobage et des outils de caractérisation des dispersions liquides mais également des vernis secs sous forme de films minces. Nous avons étudié l'influence des paramètres liés au protocole de formulation et à la composition sur la stabilité de la dispersion, sur les propriétés d'usage des films d'enrobage secs mais également sur les interactions entre les différents constituants. A partir de l'ensemble de ces résultats, deux formulations ont été retenues. Afin d'étudier l'influence des conditions séchage sur les propriétés des films d'enrobage, nous avons conçu une veine de séchage convectif. Les résultats ont montré que la morphologie et les propriétés des films secs sont essentiellement pilotées par la période de séchage à vitesse décroissante, lorsque la cinétique d'évaporation du solvant est limitée par la diffusion de celui-ci à travers le film de vernis. De plus, nous avons observé que l'augmentation de la température de séchage, notamment pour des températures de séchage proche de la température de fusion des composés fusibles des vernis (40°C pour le PEG 1500 et 55°C pour l'acide stéarique), induit des transformations morphologiques importantes des films. L'apparition de cette nouvelle morphologie provoque une amélioration notable des possibilités de déformation des films secs sans modifier leurs propriétés barrières.This study deals with the elaboration of a composite coating agent made of a fine dispersion of a hydrophobic material in a polymeric solution. Such material is applied on particles surface, thanks to a fluidised bed pulverization, to ensure their protection from wet atmosphere. We have developed a formulation protocol, coating agents and characterization tools of liquid formulation and dry thin coating films. These tools allow us to assess the influence of formulation and composition parameters on dispersion stability, valuable film properties and on interactions between film components. Thanks to these experiments, two formulations have been developed. To study the drying parameters impact on coating agent properties, a convective dryer have been designed. Dry films morphology and properties strongly depend on fallen drying rate period when solvent evaporation is limited by its diffusion through the wet film. Furthermore, we have observed that the drying temperature rise induces film morphology transformation, especially with drying temperature close to melting temperature of film fusible components (40°C with PEG 1500 and 55°C with stearic acid). This new morphology causes a great increasing of film plastic properties without endangered their barrier properties
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
