1,721,007 research outputs found
Experimental and numerical investigation of influence of air-voids on the compressive behaviour of foamed concrete
No full textAbstract not availableThang T. Nguyen, Ha H. Bui, Tuan D. Ngo, Giang D. Nguye
A cohesive damage-plasticity model for DEM and its application for numerical investigation of soft rock fracture properties
No full textAbstract not availableNhu H.T. Nguyen, Ha H. Bui, Giang D. Nguyen, Jayantha Kodikar
A thermodynamics-based cohesive model for discrete element modelling of fracture in cemented materials
No full textAbstract not availableNhu H.T. Nguyen, Ha H. Bui, Giang D. Nguyen, J. Kodikara, S. Arooran, P. Jitsangia
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
Discrete element modelling of the mechanical behaviour of a highly porous foamed concrete
No full textThe aim of this study is to numerically investigate the effect of air void structure on the mechanical behaviour of a highly porous foamed concrete using the discrete element method (DEM). In the DEM simulation, the foamed concrete, which features high porosity and a complicated internal structure, is represented by an assembly of spherical particles randomly generated in a given space predefined by a void matrix. To simulate the cementitious phase of the foamed concrete, a cohesive-frictional model with parameters calibrated from experiments is adopted. The numerical results obtained from the validated DEM model show that the air-void structure has a significant effect on the compressive strength and the fracture of the material.Thang T. Nguyen, Ha H. Bui, Tuan D. Ngo, and Giang D. Nguye
A mesh-free continuum based computational approach to modelling rock fracture
No full textThe prediction of rock fracture behaviour is a crucial aspect in many engineering applications. To facilitate this process, it is essential to develop a robust computational approach capable of predicting both the onset and post-fracture processes of the material. In this paper, the mesh-free SPH method in conjunction with a size dependent continuum constitutive model with an embedded cohesive fracture is proposed to analyse mode-I fracture behaviour of rock. To verify the SPH model, the Brazilian disc test is conducted and compared with experimental data available in the literature. A very good agreement between the simulation and experiment suggests that the proposed SPH model is a promising approach for modelling rock fracture problems.Yingnan Wang, Ha H. Bui, Giang D. Nguyen and P. G. Ranjit
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
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