1,721,467 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
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
Modulation of Single-Walled Carbon Nanotube Fluorescence via Enzyme Reaction, Controlled Aggregation and Hydrogel Swelling Towards a Continuous Glucose Sensor
No full textNear-infrared light (700--1000 nm) is important for in vivo sensing applications due to the decreased absorption, scattering and auto-fluorescent interference of tissue and whole blood at these wavelengths. However, the lack of photostable organic fluorophores that emit in this region has hampered the production of an implantable continuous analyte sensor. Single-walled carbon nanotubes (SWNT) have a tunable excitation and emission in the near-infrared (nIR) and do not photobleach. Additionally, their quasi one-dimensional nature renders them sensitive to molecular adsorption events. We explore methods to control the modulation of SWNT photoluminescence (PL) in response to glucose. We show that it is possible to assemble a glucose specific enzyme on the surface of nanotubes in solution while maintaining nanotube fluorescence and colloidal stability and preserving the activity of the enzyme. The enzyme coating exposes the nanotube surface area such that electroactive species can adsorb irreversibly to the nanotube surface. One such species, potassium ferricyanide, is shown to attenuate nanotube fluorescence emission through two distinct mechanisms; fluorescence quenching and electron withdrawal. By coupling the reaction of ferricyanide at the surface of the nanotube to the chemical action of the enzyme, nanotube fluorescence is modulated indirectly in response to glucose and has a sensitivity of 34.7 uM. It is also possible to coat the SWNT in dextran, a glucose-like polymer, for an affinity based sensor. Addition of concavalin A (ConA) causes the dextran coated nanotubes to aggregate resulting in SWNT PL intensity diminution, while subsequent additions of glucose cause the ConA-SWNT aggregates to dissolve and the PL to recover. Finally, we demonstrate hydrogel swelling as a mechanism to reversibly induce solvatochromic shifts in SWNT PL within a biocompatible hydrogel matrix. Individually dispersed nanotubes in a poly(vinyl alcohol) hydrogel matrix with varying cross-linking densities exhibit a shift in emission maxima as the cross-linking is increased, with shifts of up to -50 meV, -15 meV and -17 meV observed in swollen hydrogels versus solution-suspended nanotubes for the (6,5), (7,5) and (8,3) nanotubes, respectively. Additional shifts of up to -48 meV, -29 meV and 16 meV were observed for hydrogels that had been dried. Hydrogels, which are important materials for biomedical applications due to their biocompatibility and structural properties, develop an internal osmotic pressure in the presence of water. The electronic band gap of a single-walled carbon nanotube is known to increase or decrease with uniaxial strain or lattice deformation due to hydrostatic pressure. Although evidence of strain is present in our system, lattice deformation is insufficient to describe the observed photoluminescence shifts. Instead, we attribute the observed shifts in nanotube emission to changes in the local dielectric constant around the nanotube due to changes in the hydrogel internal pressure and cross-linking.Made available in DSpace on 2015-09-25T20:43:57Z (GMT). No. of bitstreams: 2
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Previous issue date: 2008Embargo set by: Seth Robbins for item 83702
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only145 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008
Using Covalent and Non-Covalent Chemistry to Control Properties of Single -Walled Carbon Nanotubes
No full textElectrophoretic mobility control is demonstrated via covalent functionalization with 4-hydroxybenzene diazonium and non-covalent functionalization with sodium cholate surfactant. Solution-phase solubility without surfactants can be achieved using high levels of covalent functionalization with aryl hydroxyl or aryl carboxylic acid moieties. Polymer theory based models for the Hildebrand and Hansen solubility parameters confirm the effect of functionalization. The adsorption of SWNT to silicon oxide surfaces modified with 3-aminopropyltriethoxysilane (APTES) is controlled via type of functional moiety, extent of functionalization, and nature of silicon oxide surface chemistry. Self-consistent field theory for polymer systems is applied and describes the effect of functionalization on SWNT adsorption thermodynamics.Made available in DSpace on 2015-09-25T20:43:39Z (GMT). No. of bitstreams: 2
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Previous issue date: 2008Embargo set by: Seth Robbins for item 83699
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only197 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008
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