1,720,954 research outputs found
Reliable Methodology for Measuring SERS Enhancement Factor on Colloidal and Solid Substrates: A Practical Guide
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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
Ink-jet printed SERS substrates to study reactions in a microfluidic set-up
Full text linkopenLo studio dei meccanismi e delle dinamiche delle reazioni chimiche è uno dei compiti fondamentali della chimica. Tuttavia, risulta particolarmente impegnativo quando la diffusione delle specie e la cinetica di reazione sono dello stesso ordine di velocità. In quest'ottica, nuovi approcci in cui la dinamica di diffusione e la cinetica di reazione possono essere disaccoppiate sono di grande interesse. L'obiettivo di questa tesi è quindi quello di sviluppare un set up microfluidico per studiare le reazioni in flusso attraverso i segnali di Surface-Enhanced Raman Scattering associati alle specie coinvolte. A differenza dello studio delle reazioni in batch, questo metodo permette di osservare l'evoluzione della reazione nella dimensione spaziale, mostrando potenzialmente la miscelazione dei reagenti e la reazione non appena questa inizia a verificarsi.
La base del chip, cioè la parete inferiore, è stata stampata a getto d'inchiostro con un inchiostro a base di nanoparticelle d'oro per ottenere un efficiente substrato SERS che coprisse tutti i canali. Le pareti laterali del chip sono state ottenute scavando una lastra d'ottone, per renderlo riutilizzabile e meno soggetto alla diffusione/permeazione laterale delle molecole (come avviene nel PDMS). Infine, la base e i pozzetti laterali sono stati assemblati con una colla a base di silicone e chiusi con un sottile vetrino di copertura. Le misure di micro-Raman sono state eseguite durante il flusso dei reagenti all'interno del dispositivo microfluidico, secondo routine codificate in ambiente Matlab. Questa configurazione è stata applicata per un paio di miscele binarie, la prima composta da coloranti non reagenti e la seconda da due specie che reagiscono, ottenendo una base di Schiff che è stata rilevata con successo da SERS lungo il chip microfluidico.Studying the chemical reaction mechanisms and dynamics is one of the fundamental tasks in chemistry. Nevertheless, it becomes particularly challenging when the diffusion of the species and the reaction kinetic are on the same order of velocity. In this view, new approaches in which diffusion dynamics and reaction kinetics can be decoupled are of great interest. The objective of this thesis is therefore to develop a microfluidic setup for the purpose of studying flow reactions by the Surface-Enhanced Raman Scattering signals associated with the species involved. In contrast with studying reactions in batch, this method makes it possible to observe the evolution of the reaction in the spatial dimension, potentially showing the mixing of the reagents and the reaction as soon as it starts to occur. The base of the microfluidic chip was inkjet printed with a gold nanoparticles ink to obtain an efficient SERS substrate covering all the channel. The side walls of the chip were obtained by carved out brass, to make it reusable and less prone to molecular lateral diffusion/permeation (as it happens in PDMS). Finally, the base and the side walls were assembled with a silicone-based glue and closed with a thin glass cover slide. Micro-Raman measures were run during the reagents flow within the microfluidic device according to routines coded in Matlab environment. This setup was applied for a couple of binary mixtures, the first made of not-reacting dyes and the second made of two reacting species resulting in a Schiff base that was successfully detected by SERS along the microfluidic chip
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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