1,720,978 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
Development of a tailings simulation model using System Dynamics
Full text linkThis thesis aims to demonstrate the feasibility of using System Dynamics (SD) techniques to develop a transparent, open-source and reproducible model capable of simulating long-term soil water dynamics in a tailings-cap system subject to upward flux from a consolidating tailings substrate. The developed model, which consists of a consolidation sub-model and an un-saturated flow sub-model, explores various feedback mechanisms in the self-weight consolidation process and unsaturated soil water movement under climatic influence. The tailings simulation model uses Causal Loop Diagramming (CLD) techniques to identify key feedback structures, promote system thinking and facilitate shared understanding of the inter-related behaviour between the reclamation cap and the tailings substrate.The model is implemented in the GoldSim simulation environment. The consolidation sub-model uses an explicit finite difference method to calculate the void ratio at each time step. Through various validation cases, the consolidation sub-model demonstrates its capability in carrying out both deterministic and stochastic simulations. The unsaturated flow sub-model is based on a previously developed infiltration-drainage model. This research improves the original model by adding capabilities of handling dynamic boundary conditions and inter-layer overflow mechanisms. Additional validation cases are conducted to build confidence in the modified model.The integrated model simulated a case study involving a 3 m thick coarse sand tailings (CST) cap on top of a 50 m thick thickened tailings (TT) deposit. Simulation results show that soil water dynamics in the CST cap is highly sensitive to the water release from the TT settlement. An increase in the initial solids contents of TT by 10% can delay the daylighting of the consolidation flux at the cap surface by one to two years. In order to prevent the daylighting of consolidation release water at the surface, the initial solids content of TT needs to be above 60%. The simulation also shows that the local behaviour of soil water storage in the CST cap is sensitive to changes in saturated hydraulic conductivity while the global behaviour is less sensitive to such changes.Supplemental material related to this thesis is available at https://era.library.ca/collections/7p88ck40
System Dynamics Approach to Tailings Management Simulation
Full text linkTailings Management System (TMS) consists of a web of inter-related sub-systems across disciplinary and organizational boundaries. Conventional predictive models simulate physical processes in each discipline with great details. In contrast, simulation based on System Dynamics (SD) focuses on overall behavior of the system over time rather than the typical mechanistic predictions seen in conventional numerical models. SD technique has been widely used in the field of business, ecology, public health, and environmental studies. However, despite the adoption of various SD-based tools in mine water balance and water quality studies, the identification and formulation of causal loop diagrams and feedback structures are rarely practiced in the management of tailings and mine waste. This paper builds on the foundation of a previously developed dynamic simulation tool, Tailings Management Simulator (TMSim) to demonstrate how SD can be used as a framework for inter-disciplinary collaboration and stakeholder communication. Advantages and limitation of SD-based modeling approach will also be discussed
Stochastic Simulation of Tailings Consolidation Process
No full textA system dynamics (SD) model was developed in the Tailings Management Simulator (TMSim) to simulate consolidation processes under quiescent conditions. A top-down iterative approach guides the overall philosophy of the modelling process. The GoldSim software was used as the main simulation environment to implement various stock-flow relationships and causal loop diagrams. For quiescent consolidation, an explicit finite difference scheme was used to solve the governing equation for one-dimensional large-strain consolidation process. The SD consolidation model was calibrated with a commercial software FSCA under a variety of tailings parameter input and deposit geometry. The model was also validated against past case histories and experimental data. Simulation results demonstrated that the SD model is capable of preserving key physics of the large-strain consolidation process while exposing important variables in a simplified and transparent manner. Once the deterministic base case is successfully simulated, stochastic processes are incorporated. Uncertainties are addressed by assigning probability distributions to selected input parameters. Nested Monte Carlo techniques will be used to explicitly model the two types of uncertainties: those due to inherent randomness (i.e. fines content) and those due to lack of knowledge (i.e. insufficient data collection or ignorance)
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