1,722,901 research outputs found
Schematic of transmitochondrial cybrid generation for the mtDNA 8414 site.
No full text<p>Schematic of transmitochondrial cybrid generation for the mtDNA 8414 site.</p
CFD simulation of the BS 8414 test for cladding applications
Full text linkA numerical BS 8414 model has been developed using surface ignition temperature, cone calorimeter data and a heat release rate curve from a wood crib, for simulating cladding fires. The model predicts burning rates of combustible materials, temperature profiles, burn-through of materials, burning locations and activation states of functional intumescent cavity barriers. The model is validated using seven DCLG BS 8414 tests, by correctly reproducing pass/fail results and failure mechanisms; producing comparable fire flames and reasonable agreement of temperature profiles, which are essential to the pass/fail criteria; and producing reasonable burning/burnt locations for the cladding system. The model has also been used to investigate factors affecting fire spread including cavity size, state of fire barriers, reduction of core material mass by for example dripping and the consistency of the HRR behaviour of the wood crib fire source. The limitations of the BS 8414 model are discussed including the uncertainty of surface ignition temperature; the approach to the activation of intumescent cavity barriers; the uncertainties in HRRs of the wood crib fire and the material properties. To improve the repeatability of the BS 8414 test, it is suggested that a gas burner is used rather than a wood crib fire
Validation of a CFD Fire Simulation Model to predict BS 8414 tests for cladding systems
No full textA Computational Fluid Dynamics (CFD) model, based on the SMARTFIRE software, has been developed to simulate BS 8414 fire tests. A key difference between the model described in this paper and previously published models is the use of a general ignition temperature for ACM panels. The ignition temperature, set to 550 OC, is based on the nature of the aluminium protective covering. The model, which utilises surface ignition temperature, cone calorimeter data and a heat release rate curve for a wood crib, has been validated using test data from seven DCLG BS 8414 tests. The model correctly predicts pass/fail results and failure mechanisms; produces comparable flame heights, reasonably predicts burning/burnt locations for the cladding system and produces reasonable agreement with measured temperature profiles, all of which are essential to correctly predicting the pass/fail outcome. Additionally, two important observations are derived from the modelling of BS 8414 fire tests, which are not currently explored in actual BS 8414 physical experimentation. While one of the DCLG tests passed the test, it would fail if the peak HRR of the wood crib fire was increased by only 20%, but still within the accepted range in the BS 8414 standard. Furthermore, the precise location of cavity thermocouples can impact the pass/fail outcome. Finally, the capabilities of the model to predict toxic gas concentrations produced by burning cladding materials are also demonstrated and validated by simulating two FPA BS 8414 tests. The model has reproduced the trends of the measured CO concentrations. Furthermore, model results suggest that most of the peak CO concentration is produced by the burning of the PIR insulation rather than the ACM or wood crib
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
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