1,721,050 research outputs found
The interaction between fundamental and industrial research and experimental developments in the field of polymer crystallization
No full textThe crystallization of polymers from the amorphous melt is a challenging field in which the material is subjected to changes in a combination of rapidly varying parameters in order to induce solidification with a controlled degree of crystallinity as well as maintain control over the macroscopic shape as well as semi-crystalline structure and orientation. The challenge lies in both the academic understanding as well as in the difficulty to reach industrially relevant conditions whilst obtaining the experimental data that can shed light on the processes governing the different competing physical processes that play a role during the processing.The development path of this type of research from the early time-resolved synchrotron radiation X-ray based to the current state of the art experiments is discussed
A Direct Real‐Time Observation of Anion Intercalation in Graphite Process and Its Fully Reversibility by SAXS/WAXS Techniques
Full text linkThe process of anion intercalation in graphite and its reversibility plays a crucial role in the next generation energy-storage devices. Herein the reaction mechanism of the aluminum graphite dual ion cell by operando X-ray scattering from small angles to wide angles is investigated. The staging behavior of the graphite intercalation compound (GIC) formation, its phase transitions, and its reversible process are observed for the first time by directly measuring the repeated intercalation distance, along with the microporosity of the cathode graphite. The investigation demonstrates complete reversibility of the electrochemical intercalation process, alongside nano- and micro-structural reorganization of natural graphite induced by intercalation. This work represents a new insight into thermodynamic aspects taking place during intermediate phase transitions in the GIC formation
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
Etude de la relation structure-propriétés des matériaux polymères par techniques couplées
No full textThe main focus of my research is the study of the structure-property relationships in the soft matter area in different medium such as bulk, solution as well as thin films. Particularly, I have developed my scientific in-house research activity, conducting scattering experiments both in transmission and grazing angle mode, in combination with several spectroscopies and mechanical techniques in the polymeric field such as polymer crystallization, self-assembled supramolecular polymers, advanced functional polymeric systems and metal-organic hybrid systems. As a researcher working on a leading scientific infrastructure (ESRF), I have acquired an outstanding knowledge at the forefront of X-ray instrumentation and thus, I have benefited from close interaction with the most prominent research groups in materials science, specifically soft condensed matter, in the Netherlands and Europe. This has encouraged me to develop novel sample environments and performed cutting edge X-ray experiments in combination with several other leading techniques in a soft matter such as microscopy, calorimetry, spectroscopy, rheology. Currently, I have focused my research on the development and characterization of novel biosource block-copolymers with biocompatible blocks. Novel advanced biopolymers are ideal candidates with applications in vital areas of the biomedical or pharmaceutical field when coupled with drugs and key metallic nanoparticles.Mes recherches portent principalement sur l'étude des relations structure-propriété dans le domaine de la matière molle dans différents milieux tels que le massif, la solution ainsi que les films minces. En particulier, j'ai développé mon activité de recherche scientifique en interne, en menant des expériences de diffusion de la lumière à la fois en mode transmission et en mode angle rasant, en combinaison avec plusieurs spectroscopies et techniques mécaniques dans le domaine des polymères comme la cristallisation des polymères, les polymères supramoléculaires auto-assemblés, les systèmes polymères fonctionnels avancés et les systèmes hybrides métal-organiques. En tant que chercheur travaillant sur une infrastructure scientifique de pointe (ESRF), j'ai acquis des connaissances exceptionnelles à la pointe de l'instrumentation des rayons X et j'ai ainsi bénéficié d'une interaction étroite avec les groupes de recherche les plus éminents en science des matériaux, en particulier la matière condensée molle, aux Pays-Bas et en Europe. Cela m'a encouragé à développer de nouveaux environnements d'échantillonnage et à réaliser des expériences de pointe en matière de rayons X en combinaison avec plusieurs autres techniques dans le domaine de la matière molle, telles que la microscopie, la calorimétrie, la spectroscopie et la rhéologie. Actuellement, j'ai concentré mes recherches sur le développement et la caractérisation de nouveaux copolymères blocs de biosourcés avec des blocs biocompatibles. Les nouveaux biopolymères avancés sont des candidats idéaux pour des applications dans des domaines vitaux du domaine biomédical ou pharmaceutique lorsqu'ils sont associés à des médicaments et à des nanoparticules métalliques clés
Etude de la relation structure-propriétés des matériaux polymères par techniques couplées
No full textThe main focus of my research is the study of the structure-property relationships in the soft matter area in different medium such as bulk, solution as well as thin films. Particularly, I have developed my scientific in-house research activity, conducting scattering experiments both in transmission and grazing angle mode, in combination with several spectroscopies and mechanical techniques in the polymeric field such as polymer crystallization, self-assembled supramolecular polymers, advanced functional polymeric systems and metal-organic hybrid systems. As a researcher working on a leading scientific infrastructure (ESRF), I have acquired an outstanding knowledge at the forefront of X-ray instrumentation and thus, I have benefited from close interaction with the most prominent research groups in materials science, specifically soft condensed matter, in the Netherlands and Europe. This has encouraged me to develop novel sample environments and performed cutting edge X-ray experiments in combination with several other leading techniques in a soft matter such as microscopy, calorimetry, spectroscopy, rheology. Currently, I have focused my research on the development and characterization of novel biosource block-copolymers with biocompatible blocks. Novel advanced biopolymers are ideal candidates with applications in vital areas of the biomedical or pharmaceutical field when coupled with drugs and key metallic nanoparticles.Mes recherches portent principalement sur l'étude des relations structure-propriété dans le domaine de la matière molle dans différents milieux tels que le massif, la solution ainsi que les films minces. En particulier, j'ai développé mon activité de recherche scientifique en interne, en menant des expériences de diffusion de la lumière à la fois en mode transmission et en mode angle rasant, en combinaison avec plusieurs spectroscopies et techniques mécaniques dans le domaine des polymères comme la cristallisation des polymères, les polymères supramoléculaires auto-assemblés, les systèmes polymères fonctionnels avancés et les systèmes hybrides métal-organiques. En tant que chercheur travaillant sur une infrastructure scientifique de pointe (ESRF), j'ai acquis des connaissances exceptionnelles à la pointe de l'instrumentation des rayons X et j'ai ainsi bénéficié d'une interaction étroite avec les groupes de recherche les plus éminents en science des matériaux, en particulier la matière condensée molle, aux Pays-Bas et en Europe. Cela m'a encouragé à développer de nouveaux environnements d'échantillonnage et à réaliser des expériences de pointe en matière de rayons X en combinaison avec plusieurs autres techniques dans le domaine de la matière molle, telles que la microscopie, la calorimétrie, la spectroscopie et la rhéologie. Actuellement, j'ai concentré mes recherches sur le développement et la caractérisation de nouveaux copolymères blocs de biosourcés avec des blocs biocompatibles. Les nouveaux biopolymères avancés sont des candidats idéaux pour des applications dans des domaines vitaux du domaine biomédical ou pharmaceutique lorsqu'ils sont associés à des médicaments et à des nanoparticules métalliques clés
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
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