1,720,953 research outputs found
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
Response of DNA molecules to external fields: Electric and hydrodynamic
No full textCasimir PhD Series: 2020-03ChemE/Product and Process Engineerin
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
Electroporation of biomimetic vesicles
No full textElectroporation is a popular technique to permeabilize the membrane for different purposes such as medical treatments, food processing and biomass processing. In this thesis, we use the bottom-up approach to unravel the role of specific cellular components in the electroporation of cellular membranes. We have studied the role of the gel-phase domains in the membrane and the contribution of the actin-cortex during electroporation. In order to do so, we have prepared binary-phase vesicles, containing fluid- and gelphase lipids, and actin-cortex encapsulated vesicles. Consequently, the electroporation mechanisms of these two samples provide systematic insight in the electroporation mechanism of a single cell.Reservoir Engineerin
Biomolecule electrotransfer to mammalian cells
No full textDelivery of biomolecules using pulsed electric fields or electrotransfer has applications such as biomedical engineering, bioprocess engineering and genomic engineering. When a cell is placed in an electric field, the induced transmembrane voltage catalyzes the formation of pores on the cell membrane. This enables the delivery of otherwise cell membrane-impermeable molecules to the cells. Despite the broad significance, a complete biophysical understanding of electrotransfer at a subcellular level and a translation of electroporation as a high-throughput and high-efficiency technique is still lacking. In this dissertation: (i) we unravel how actin networks regulate the cell membrane electropermeability, (ii) we reveal the intracellular biophysical transport mechanisms of electrotransferred DNA cargo, (iii) we present a localized electroporation device where cells are trapped in regions of high electric fields by the flow.ChemE/Product and Process Engineerin
The Role of Micellar Nanowires in Diagnosing Tropical Diseases
No full textThe tropical mosquito-transferred virus diseases Dengue, Zika and Chikungunya are causing hundreds of millions infections worldwide every year. Their occurrences are often linked, also due to their common transfer vector – the mosquito – thus they are of interest as a group together. Areas of prevalence include vast rural areas of low to middle income countries such as Indonesia, often with sub-optimal access to medical facilities. An affordable, reliable and easy-to-use point-of-care test would assist monitoring outbreaks, allowing earlier countermeasures such as mosquito extermination or setup of temporary on-site medical aid, as well as help allowing timely treatment in the often far-away hospitals.ChemE/Advanced Soft Matte
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