1,721,070 research outputs found
The evolutive mechanism of debris flows: analysis and protection works
No full textDebris flow analysis requires the choice of a theoretical fluid model. The main models used to describe the mechanics of debris flows are the plastic viscous fluid model, above all the Bingham fluid model, and the dilatant fluid model. The dilatant fluid model is usually applied to analyse the behaviour of flows in which the viscosity of the pore fluid is relatively low and shear rates, mean grain diameter, density and water content are sufficiently high.
A 3D numerical model based on the Cellular Automata Method (Deangeli et al., 1994) using the fluid dilatant model proposed by Takahashi has been applied to simulate the evolutive mechanism of debris flows.
In recent years great interest have been given to the study of Cellular Automata. In this kind of model the system is subdivided into a set of cells (or sites), each with a finite number of possible values. The values of each cell is simultaneously updated in a sequence of discrete time steps, according to a fixed deterministic rule. The rule at each site depends only on the values of the neighbouring sites.
The Cellular Automata model has been applied to back analyse an important debris flow that occurred in Lessolo-Ronchi (Italy), during the flood of November 1994.
This study allowed the calibration of the geotechnical parameters of the unstable mass and the setting up of a numerical model to forecast the subsequent travelling of debris flows in the landslide area. The project of protection work was designed and verified on the basis of the numerical model results
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
Impact of different thermal zone data simplification for model calibration on monitored-simulated performance gaps
Full text linkThe paper analyses the impact of different simplification approaches for model
verification purposes considering a reference demo case of a municipality school located in
Torre Pellice (Italy), which has been monitored with room detail since April 2021. The target
variable of the calibration process is the indoor air temperature: firstly, results validity is
checked on an unoccupied free-running period; secondly, occupied standard behaviours and
adapted to real-use ones are adopted to test the simplification choices impact on indoor thermal
comfort indicators (e.g. the Adaptive Comfort Model). Several model simplification actions on
both building-level construction and zoning approaches are considered. Results of this demo
case demonstrate the usability of simplified models, which can be adopted instead of more
detailed and time-consuming full models for performance gap detections and other analyses
Comparing different approaches to define shading control threshold via a new automatic building simulation platform
Full text linkActive shading systems are essential to prevent heat gains in buildings and reduce
the risk of overheating phenomena. The control logic must avoid overheating while allowing
solar gains during heating hours. In general, smart control is based on a temperature and/or
solar irradiation threshold; however, innovative informatics tools now allow optimising these
thresholds based on specific building and climate characteristics. The paper presents a new
building energy dynamic simulation platform used here to define optimal shading control
thresholds for free-running and mechanically cooled spaces. Several shading control
approaches are applied and compared, considering fixed hourly schedules, controls based on
standard thresholds, and optimised thresholds with the tool. The analysis is performed
considering the sole summer. The approach shows how the developed platform and the
proposed methodology can optimise shading control thresholds, considering the specific
building characteristics and the local climate conditions, consequently reducing energy needs
or thermal discomfort conditions
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
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