Search results for "Model"
showing 10 items of 24058 documents
Coupled stability and eco-hydrological model to predict shallow landslides
2012
Analysis of parametric uncertainty in a shot noise model
2005
All model calibrations are subject to uncertainty. Even when an optimization procedure is used, the specific calibration period strongly influences the parameter values and causes uncertainty in streamflow prediction. The present paper aims to study the influence that the dimension and the position of the sampling period have on the uncertainty of the response of a daily conceptual shot noise model. The simulations have been conducted using continuous daily series of discharges recorded for 76 years on the river basin of Oreto (Palermo, Italy). Many continuous sub-series for simulations have been obtained from the historical series available. In the first place many model calibrations have …
Deep-learning based reconstruction of the shower maximum X max using the water-Cherenkov detectors of the Pierre Auger Observatory
2021
The atmospheric depth of the air shower maximum $X_{\mathrm{max}}$ is an observable commonly used for the determination of the nuclear mass composition of ultra-high energy cosmic rays. Direct measurements of $X_{\mathrm{max}}$ are performed using observations of the longitudinal shower development with fluorescence telescopes. At the same time, several methods have been proposed for an indirect estimation of $X_{\mathrm{max}}$ from the characteristics of the shower particles registered with surface detector arrays. In this paper, we present a deep neural network (DNN) for the estimation of $X_{\mathrm{max}}$. The reconstruction relies on the signals induced by shower particles in the groun…
ESTIMATING SOIL PARTICLE-SIZE DISTRIBUTION FOR SICILIAN SOILS
2009
The soil particle-size distribution (PSD) is commonly used for soil classification and for estimating soil behavior. An accurate mathematical representation of the PSD is required to estimate soil hydraulic properties and to compare texture measurements from different classification systems. The objective of this study was to evaluate the ability of the Haverkamp and Parlange (HP) and Fredlund et al. (F) PSD models to fit 243 measured PSDs from a wide range of 38 005_Bagarello(547)_33 18-11-2009 11:55 Pagina 38 soil textures in Sicily and to test the effect of the number of measured particle diameters on the fitting of the theoretical PSD. For each soil textural class, the best fitting perf…
Multiple forms of stakeholder interaction in environmental management: business arguments regarding differences in stakeholder relationships
2010
This study describes and interprets differences in stakeholder interaction as rhetorically constructed in environmental reports and in interviews with environmental managers. It also interprets the role of the natural environment among stakeholders, and discusses how that role is justified or not justified. The study focuses in a business perspective on stakeholder interaction in environmental management. Characteristically, stakeholder studies of environmental management have concentrated on stakeholder influence or the creation of stakeholder management models. In contrast to those, the present study identifies different types of stakeholder relationships: power-based, collaborative, conf…
Testing and implementing a new approach to estimating interregional output multipliers using input-output data for South Korean regions
2020
Flegg's location quotient (FLQ) is a useful tool for estimating intraregional output multipliers. This paper uses it as one component when estimating interregional multipliers. Using statistical information criteria and official data for 16 South Korean regions, it is found that the best approach is to combine the FLQ with a simple trade model. The paper explains how the proposed procedure can be implemented for both multiple and individual regions, and also how a region-specific value for the unknown parameter δ in the FLQ formula can be determined. Finally, an illustrative case study of one of the regions is carried out.
Charge Transport Mechanisms in Heavy-Ion Driven Leakage Current in Silicon Carbide Schottky Power Diodes
2016
Under heavy-ion exposure at sufficiently high reverse bias voltages silicon carbide (SiC) Schottky diodes are observed to exhibit gradual increases in leakage current with increasing ion fluence. Heavy-ion exposure alters the overall reverse current-voltage characteristics of these diodes, leaving the forward characteristics practically unchanged. This paper discusses the charge transport mechanisms in the heavy-ion damaged SiC Schottky diodes. A macro model, describing the reverse current-voltage characteristics in the degraded SiC Schottky diodes is proposed. peerReviewed
Kāda biomasas gazifikācijas modeļa skaitliskā analīze
2017
Šajā darbā tiek pētīts gazifikācijas procesa matemātiskais modelis. Tiek analizēta siltumapmaiņas reakcijas vienādojumu sistēma, konstruēts tās matemātiskais modelis un izpētīti raksti par gazifikācijas norises procesiem.
Management Simulator as an Instrument to Aid Turning “Stunted Growth” Round in Family Businesses
2008
This paper is the fourth in a series which has described the role and construction of simulation models and a ‘Management Flight Simulator’ that could aid the entrepreneur-owners of so-called ‘dwarf’ or ‘stunted growth’ small firms to break out from the constraints holding them back. While the research presented to date has highlighted the issues in such companies, and has suggested that in many situations relatively simple changes only might be needed to unleash the growth potential of such firms, effecting such changes is not likely to be that “simple” in real life. It has to be possible for affected owner-entrepreneurs to understand a number of factors: that there is a problem (or opport…
Nouvelles technologies et aide à la compréhension de documents techniques : Construction et expérimentation d'un simulateur de fonctionnement de grue…
2001
Reading skills are more and more required to succeed professional examination. French crane drivers are concerned with this problem. In order to help them, we have conducted a study with three main steps. First, we carried out a cognitive work analysis. Second, we test several analogical modalities of written presentations focusing on the construction of a specific simulator. Finally, two experiments are presented showing a significative effect of this simulator on the comprehension of cranes technical documentation.