1,721,160 research outputs found
Replication Package: Using Voice and Biofeedbackto Predict User Engagementduring Requirements Interviews
No full textThis is a replication package for the paper "Using Voice and Biofeedbackto Predict User Engagementduring Requirements Interviews", by Alessio Ferrari, Thaide Huichapa, Paola Spoletini, Nicole Novielli, Davide Fucci and Daniela Girardi
Resistenza a taglio di campioni rimaneggiati di Opalinus Clay
No full textLa nota presenta una selezione dei risultati di un ampio programma sperimentale condotto con l’obiettivo di caratterizzare, dal punto di vista della resistenza a taglio, dei campioni rimaneggiati di Opalinus Clay, attraverso l’esecuzione di prove triassiali non convenzionali. I risultati mostrano chiaramente l’influenza del grado di preconsolidazione sul comportamento meccanico del geomateriale e in particolare sulla resistenza a taglio, che risulta caratterizzata da un picco di resistenza poco marcato e da un comportamento dilatante. La presenza di giunti all’interno del provino altera completamente il comportamento originario del materiale, che diventa duttile e contraente. Inoltre, in tali condizioni, la resistenza a taglio si riduce drasticamente ai valori di resistenza residua
Comportamento idro-meccanico di terreni estrusi
No full textIl processo di estrusione dei terreni a grana fina rappresenta uno tra i processi alla base dei metodi di stampa 3D dei terreni.
Nel seguente contributo si sono scelti dei terreni adatti a tale scopo e si è studiato come le variabili dipendenti dal processo di stampa, quali la pressione applicata e la dimensione dell’ugello influissero sul materiale estruso
Systematic Evaluation and Usability Analysis of Formal Tools for Railway System Design - Technical Annexes
No full textThis package includes additional data for the paper ``Systematic Evaluation and Usability Analysis of Formal Tools for Railway System Design'', by Alessio Ferrari, Franco Mazzanti, Davide Basile, and Maurice ter Beek, CNR-ISTI, Italy.
The paper concerns the systematic evaluation and usability analysis of 14 formal tools for system design, namely CADP (2020-g), FDR4(4.2.7), NuSMV(1.1.1), ProB(1.9.3), Atelier B (4.5.1), Simulink (R2020a), SPIN (6.4.9), UMC (4.8), UPPAAL (4.1.4), mCLR2 (202006.0), SAL (3.3), TLA+ (2) and CPN Tools (4.0). The current package includes the following content:
Tool Evaluation Template and .pdf: a document including the reference evaluation template, and the evaluation sheet of each tool.
Tool Evaluation Table.xlsx: a table summarizing the results of the evaluation.
System Usability Test - SUS Results.xlsx: an excel file with multiple sheets with all the raw results of the usability test for the tools
A conceptual model to analyse a rainfall-induced slow-moving rock slide
No full textLandslide risk assessment and management cannot disregard an accurate analysis of the triggering mechanisms and hydro-mechanical features, that characterise the landslide body in the pre- and post-rupture phases. For these reasons, it should be considered that, in the case of landslides reactivated by precipitation, rainwater infiltration contributes to the increase in pore water pressure along the sliding surfaces. Fluctuations in pore water pressure have a clear effect on the available shear strength and therefore, play a key role in the variation of the cumulative displacements of the landslide body over time. This study focuses on a clay slope where large blocks of fractured rock slowly slide. These blocks are separated from each other by open fractures in which rainwater infiltrates. The rock blocks have different geometric dimensions, with shapes ranging from "towers" to "slabs." The hypothesised scenario is therefore a translational landslide triggered by rainfall. This type of instability is physically interpreted using a new simplified hydro-mechanical model, that allows the mechanical simulation of the landslide body during the propagation phase of movement. The model considers of several crucial aspects of the hypothesized mechanism, such as the effect of rainwater within the fractures, the permeability of the fracture system, the viscosity and shear strength at the sliding surface, and the diffusion of water pressure at the base of the blocks over time. The interaction between two or more adjacent blocks sliding is simplified in the model by the "squeezing" effect of the water present inside the fractures. This effect depends on the variation in fracture aperture and the volume of water stored in the fracture. The model uses a finite difference approach to integrate the velocity over time and to compute the displacement of the different rigid blocks of the landslide body. To evaluate the performance of the model and to highlight the role of the modelling parameters, about 120 simulations belonging to nine different synthetic scenarios were carried out. The scenarios considered both single-block landslide and multi-block systems (i.e., compound landslides). The results obtained show physically reliable simulations, suggesting that the model can be considered as a promising tool for interpreting the pre- and post-failure displacements. Furthermore, the model can be applied to a wide range of hydro-mechanical and climatic scenarios. Future developments of this research include the validation of the model using the monitoring data from a real case study. The case study will have similar characteristics to those of the reference landslide mechanism. The validation will be carried out in a two-step procedure. In the first step, the conceptual model parameters will be calibrated on the monitoring data from a reference period. In the second step, the modelled data will be compared with the measured data from the monitoring period following the reference period
Evoluzione del comportamento idro-meccanico di una sabbia di quarzo dallo stato saturo allo stato asciutto
No full textLa nota presenta i risultati di un lavoro sperimentale condotto con lo scopo di analizzare il comportamento idro-meccanico di una sabbia quarzosa per un ampio intervallo del grado di saturazione. Per analizzare le caratteristiche di ritenzione del materiale e per investigare la relazione tra la tensione di snervamento e la suzione di matrice sono state eseguite prove edometriche a suzione controllata e a contenuto d'acqua costante. I risultati ottenuti mostrano che la tensione di snervamento della sabbia non aumenta monotonamente con la suzione. Tale andamento è caratterizzato da un punto di massimo e da valori della tensione di snervamento sostanzialmente coincidenti per la condizioni satura e asciutta. Questo aspetto, non considerato finora dai modelli elasto-plastici per i terreni non saturi, conferma una delle principali ipotesi della classica Meccanica dei Terreni, secondo cui il comportamento meccanico di mezzi granulari saturi e asciutti è lo stesso se descritto in termini di tensioni efficaci
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
Assessing the Potential Impact of 1.5 °C Global Warming on the Local Response of a Pyroclastic Cover Susceptible to Shallow Landslides
No full textIn the Campania region (southern Italy), shallow landslides frequently involve steep slopes covered by loose pyroclastic soil in unsaturated conditions, causing several fatalities. For these phenomena, the slope response to heavy rainfall depends on the hydraulic state within the soil cover before the rainstorm. A clear indicator of such a state is the water storage (WS, the mean value of the integral of the water content in a unit base soil column). Hence, a threshold in terms of WS may be used in physically based predictive models. This work illustrates a framework to analyse the potential changes, due to global warming, in weather patterns regulating the slope atmosphere interaction (namely, precipitation and temperature) and the associated changes in WS, in pyroclastic slope susceptible to shallow landslides. A pyroclastic slope monitored for two years, placed on Mt. Faito (Lattari Mts. in Southern Italy) close to ancient flow-like landslides has been adopted as the pilot site. The slope hydraulic behaviour under the future temporal horizon and reference period has been modelled by Finite Element (FE) code. The future temporal horizon is identified assuming a fixed increase in global warming: in the specific, 1.5 °C defined in the Paris Agreement (2015) to preserve human and ecosystem livelihood on the Earth. The variations in WS are compared between the 1.5 °C scenario and the reference period 1981–2010. For the investigated case, the results of analyses under an “optimistic” global scenario, show that the number of events potentially leading to slope instability could not be affected significantly
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
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