1,720,964 research outputs found
Sintesi di aggregati porosi di nanoparticelle polimeriche per cell housing
No full textLAUREA SPECIALISTIC
Molecular modeling of macromolecular systems
No full textL'attività di ricerca discussa nella presente Tesi di Dottorato è compresa in un "initial training netwrok", il cui obiettivo è la realizzazione di modellazioni computazionali multi-scale di sistemi chimici di interesse industriale. Lo scopo di questa Tesi consiste nell'applicazione di metodi quantomeccanici a sistemi polimerici per ottenere risultati alla scala atomica e molecolare nel contesto di una modellazione multi-scale. L'argomento principale della presente attività di ricerca è lo studio dei fenomeni che regolano la cinetica di polimerizzazione oltre agli stadi stessi che regolano la polimerizzazione radicalica. L'obiettivo è quindi quello di ottenere dei dati accurati tramite l'utilizzo della quantomeccanica evitando così campagne sperimentali molto costose, anche in termini di tempo, e che presentano comunque dei limiti sperimentali. In dettaglio, i parametri termodinamici che definiscono i diversi stadi delle polimerizzazioni vengono determinati attraverso simulazioni "ab initio" ed approci basati sulla "Density functional theory"(DFT). Nel lavoro vengono studiate le cinetiche delle reazioni di propagazione di sistemi copolimerici e terpolimerici e le reazioni secondarie di tipo intra- o/e inter-molecolare reazioni di trasferimento. In aggiunta, la capacità del metodo sviluappato di fornire risultati accurati è stata verificata tramite il confronto con dati sperimentali di letteratura, ove disponibili.The research conducted under the present Ph.D. thesis is part of an initial training network whose aim is to perform multi-scale computational modeling of chemical systems of industrial interest. The aim of this thesis is to apply quantum mechanics (QM) tools to polymer systems to provide results at the atomistic and molecular scale of multi-scale modeling. The main subject of this research is the investigation of phenomena that control the kinetic behavior of molecular species and the study of the kinetic steps involved in free radical polymerization (FRP) of polymer systems to replace the current costly, time consuming, and often limited experiments with accurate QM computations. In particular, through ab initio simulations and approaches based on density functional theory (DFT) the fundamental thermodynamic parameters of reactions that occur during the FRP are determined. The kinetics of propagation reactions of copolymer and terpolymer systems as well as secondary reactions such as intra- and/or inter-molecular chain transfers in FRP were evaluated. The capacity of the method to provide accurate results has been validated using experimental values whenever they were available in the literature.DIPARTIMENTO DI CHIMICA, MATERIALI E INGEGNERIA CHIMICA GIULIO NATTA26MORBIDELLI, MASSIMOFARAVELLI, TIZIAN
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
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