1,721,036 research outputs found
Properties and dynamics of bulk subgrains probed in-situ using a novel X-ray diffraction method
No full textThe application of multiscale modelling for the prediction of plastic anisotropy and deformation textures
No full textFinite element models for metal forming and models for the prediction of forming limit strains should be as accurate as possible, and hence should take effects due to texture, microstructure and substructure (dislocation patterns) into account. To achieve this, a hierarchical type of modelling is proposed in order to maintain the balance between calculation speed (required for engineering applications) and accuracy. This means that the FE models work with an analytical constitutive model, the parameters of which are identified using results of multilevel models. The analytical constitutive model will be discussed, as well as the identification procedure. The multilevel models usually connect the macro-scale with a meso-scale (grain level) via a homogenisation procedure. They can also be used to make predictions of deformation textures. These will be quantitatively compared with experimentally obtained rolling textures of steel and aluminium alloys. It was found that only models which to some extent take both stress and strain interactions between adjacent grains into account perform well. Finally an example of a three level model, also including the micro-scale (i.e. the dislocation substructure), will be given.sponsorship: The authors want to thank O. Engler, P. Bate, M. Crumbach and G. Gottstein for help with the simulations and for many valuable discussions. They gratefully acknowledge financial support by the Federal Government of Belgium (Belgian Science Policy Contract P5/08) and by the European Union (VIRFORM-project). Two of the authors (MS and LD) wish to thank the Flemish government for their FWO- fellowship/scholarship which has made part of this work possible. (Federal Government of Belgium (Belgian Science Policy)|P5/08, European Union (VIRFORM-project), Flemish government)status: Publishe
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
The development of matrix and interface microstructures and their effect on the mechanical behaviour of SiC particulate reinforced Al matrix composites
No full textSIGLEAvailable from British Library Document Supply Centre- DSC:D062168 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
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
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
Effect of the Pin Length and the Anvil Insulation on Friction Stir Spot welding Thin Gauge 6111 Automotive Sheet,
Get PDFFriction stir spot welding (FSSW) is a relatively new solid state joining process, with potential applications in the automotive industry. It uses a rotating tool which is plunged and withdrawn without translation, to generate heat frictional, which softens the material and a solid state bond is made between the surfaces of the upper and lower sheets. The main aim of the work presented was to investigate the influence of tool pin length and the application of an insulating back face anvil, to improve the temperature distribution, on the lap shear strength of welds in thin (0.9 mm) 6111-T4 aluminium automotive sheet. It was found that the insulated anvil increased the peak temperature in the bottom sheet by ~ 30???C. Irrespective of the pin length, there was a general reduction in lap shear strength by ~ 15% and an associated change in failure mode when a ceramic anvil was used. It was noted that increasing the pin length from 1 to 1.4 mm also resulted in a similar change in failure mode and a reduction in shear strength from ~ 3.1 to 2.9 kN
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