1,720,965 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Thermomechanical finite element simulation of welding, and elevated-temperature mechanical behaviour of high and ultra-high strength steels
No full textThe development of high and ultra-high strength steels (HSSs/UHSSs) emerged as an engineering approach to enable lightweight structural applications and an environmental solution to reduce the steel production-related carbon footprint. There is increasing use of HSSs/UHSSs in a diverse range of industrial applications due to their excellent strength-to-weight ratio, weldability, and toughness. Fusion welding techniques and inbetween, arc welding processes are indispensable as efficient methods to make permanent joints between components and structural members made from HSSs/UHSSs. Ensuring the safe application of assemblies made from these materials and exploiting their maximum load-bearing capacities require extensive research on the behaviour of such materials due to welding heat and elevated temperatures that cause welding residual stresses, different welding deformations, and strength degradation.
Consequently, the development of welding residual stresses and distortions in different HSSs/UHSSs was investigated by means of finite element (FE) simulation of welding. Sequentially coupled thermomechanical formulation was adopted in all the cases considered, and mathematical modelling of the heat source was based on a double ellipsoidal heat source model. In this regard, welding distortions due to bead-on-plate welding of a specimen made of S960MC were simulated incorporating solid-state phase transformation models. Comparison of the simulated results and experimental measurements showed that a more accurate prediction of angular and out-of-plane bending distortions is possible when the effect of phase transformation is considered.
Development of welding residual stresses and distortions in T-joints made of S700MC under different external restraints and welding sequences for continuous and short noncontinuous fillet welds were numerically and experimentally investigated in separate studies. Thermo-elastic–plastic FE models were developed considering material and geometrical nonlinearities. The results showed that for both continuous and short fillet welds, the effects of mechanical boundary conditions on sequential and cumulative welding distortions and welding residual stresses are more significant than the welding sequence. While angular distortion and transverse residual stresses were highly affected by the configuration of external constraints, longitudinal residual stresses were found to be less affected. Comparing the results of the two studies showed that localized transverse stress fields with higher peak magnitudes resulted from short fillet welds.
The strength degradation of two grades of UHSSs, namely, S960MC and S1100, due to elevated temperatures in as-received and as-welded conditions was investigated experimentally. Standard specimens were manufactured, and steady-state hot tensile tests from room temperature to 900 °C were carried out. The reduction factors of the constitutive mechanical properties of the two steels were determined and compared with several leading standard predictive models and datasets from the literature. Finally, predictive equations were proposed to estimate those reduction factors for the tested UHSSs at elevated temperatures.ei tietoa saavutettavuudest
Solid-state phase transformation incorporated welding simulation and prediction of residual stresses and deformations of ultra-high strength steel Strenx®960 MC
Get PDFThis study investigates prediction of transverse residual stresses as well as angular and bending distortions in bead on plate welding of the low carbon ultra-high strength steel Strenx®960 MC by developing a three-dimensional sequentially-coupled thermal, metallurgical and mechanical finite element model in ABAQUS. Modelling the heat source was carried out considering a volumetric heat source based on the Goldak’s double ellipsoidal heat source model implemented in DFLUX user subroutine. Modelling the heat loss was accomplished using the FILM user subroutine. The effect of solid-state phase transformation during welding was included in numerical model through applying volumetric changes induced by austenitic, bainitic and martensitic transformations based on dilatometric tests and continuous cooling transformation (CCT) diagram of the material under investigation. User subroutine USDFLD was developed to determine volume fraction of present phases based on the available mathematical kinetics models for diffusive and dispalcive transformations. Modification of thermal expansion coefficient was performed using user subroutine UEXPAN in ABAQUS in which volumetric changes during phase transformations were incorporated. The results of simulations indicate that distortions and residual stresses in particular, are significantly affected by solid-state bainitic and martensitic transformations
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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