1,744,565 research outputs found
Crystal engineering of zeolites with graphene
Get PDFAchieving control over the morphology of zeolite crystals at the nanoscale is crucial for enhancing their performance in diverse applications including catalysis, sensors and separation. The complexity and sensitivity of zeolite synthesis processes, however, often make such control both highly empirical and difficult to implement. We demonstrate that graphene can significantly alter the morphology of titanium silicalite (TS-1) particles, in particular being able to reduce their dimensions from several hundreds to less than 10 nm. Through electron microscopy and molecular mechanics simulations we propose a mechanism for this change based on the preferential interaction of specific TS-1 surfaces with benzyl-alcohol-mediated graphene. These findings suggest a facile new means of controlling the zeolite morphology and thereby also further demonstrate the potential of graphene in hybrid materials. Moreover, the generality of the mechanism points the way to a new avenue of research in using two-dimensional materials to engineer functional inorganic crystals
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
Complete genome sequence analysis of <em>Archaeoglobus fulgidus</em> strain 7324 (DSM 8774), a hyperthermophilic archaeal sulfate reducer from a North Sea oil field
Get PDF\ua9 2017 The Author(s). Archaeoglobus fulgidus is the type species of genus Archaeoglobus Stetter 1998, a hyperthermophilic sulfate reducing group within the Archaeoglobi class of the euryarchaeota phylum. Members of this genus grow heterotrophically or chemolithoautotrophically with sulfate or thiosulfate as electron acceptors. Except for A. fulgidus strain 7324 and the candidate species "Archaeoglobus lithotrophicus", which both originate from deep oil-fields, the other members of this genus have been recovered from marine hydrothermal systems. Here we describe the features of the A. fulgidus strain 7324 genome as compared to the A. fulgidus VC16 type strain. The 2.3 Mbp genome sequence of strain 7324 shares about 93.5% sequence identity with that of strain VC16T but is about 138 Kbp longer, which is mostly due to two large \u27insertions\u27 carrying one extra cdc6 (cell-cycle control protein 6) gene, extra CRISPR elements and mobile genetic elements, a high-GC ncRNA gene (hgcC) and a large number of hypothetical gene functions. A comparison with four other Archaeoglobus spp. genomes identified 1001 core Archaeoglobus genes and more than 2900 pan-genome orthologous genes
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
Serviço de referência na área da saúde em contexto universitário: o papel de mediador do bibliotecário de referência
Get PDFThe Academic library plays an important role within the organisational mission of the university, since it helps in the development of its inner values and contributes to the achievement of the pedagogical and scientific plans. In the above context the reference librarianship is no longer an information provider, he becomes an assertive and pro-active part of scientific knowledge growth.
In this dissertation, the intention is to examine and evaluate the intermediary role played by the health area reference librarianship. This evaluation will be done under an academic and medical perspective. The reference librarianship should have the users‟ needs at the centre of his role. He should always use the information and communication technologies available; however, the ethical part of the process cannot be forgotten. In this dissertation, the study approach used was similar to the one usually used on case studies. Our case study basis is the 250 health area teachers of Escola Superior de Tecnologia da Saúde de Lisboa. The inquiry was the method used in order to obtain the data for this research. Our case study conclusions may give some idea about the new profile of the reference librarianship of the academic context within the health area, which are as follows: 1) the reference librarianship has to co-operate with the students and teachers in the classes, in other words, they have to start working in the field instead of being „closed‟ in the academic library; 2) within the library, the reference librarianship should support the increase of information consultancy; the librarian should have the capacity to use his skills in order to help the user; 3) the user would prefer the librarian to assist/guide in the research process rather than using the librarian‟s skills to provide the research material; 4) the user should be aware that a fee may be payable if he requires an urgent and quality research service which is/can be provided by a skilled professional (reference librarianship); 5) the reference librarianship can be helpful in the field, when working with a health care team (hospital) based on their access and capacity to have the latest news on health research discoveries and being able to resolve medical doubts due to their capacity to deal with problem-based learning
Séminaire de recherche sur la production de sarcophages - LAT (UMR 7324 CITERES) - 29 novembre 2013
No full textLe vendredi 29 novembre 2013 aura lieu à la MSH Val de Loire (Tours) un séminaire de recherche du Laboratoire Archéologie et Territoires (UMR 7324 CITERES, Université de Tours/CNRS) ayant pour thème : La production des sarcophages de pierre du haut Moyen Âge en France du Centre et de l'Ouest Le programme est disponible ici 2013_sarcoHMA_affich
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
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