Search results for "Modell"

Stochastic models for wind speed forecasting

2011

Abstract This paper is concerned with the problem of developing a general class of stochastic models for hourly average wind speed time series. The proposed approach has been applied to the time series recorded during 4 years in two sites of Sicily, a region of Italy, and it has attained valuable results in terms both of modelling and forecasting. Moreover, the 24 h predictions obtained employing only 1-month time series are quite similar to those provided by a feed-forward artificial neural network trained on 2 years data.

SISALv2: a comprehensive speleothem isotope database with multiple age–depth models

2020

Characterizing the temporal uncertainty in palaeoclimate records is crucial for analysing past climate change, correlating climate events between records, assessing climate periodicities, identifying potential triggers and evaluating climate model simulations. The first global compilation of speleothem isotope records by the SISAL (Speleothem Isotope Synthesis and Analysis) working group showed that age model uncertainties are not systematically reported in the published literature, and these are only available for a limited number of records (ca. 15 %, n = 107/691). To improve the usefulness of the SISAL database, we have (i) improved the database’s spatio-temporal coverage and (ii) create…

Reverse electrodialysis heat engine for sustainable power production

2017

Abstract Reverse Electrodialysis Heat Engine (REDHE) is a promising technology to convert waste heat at temperatures lower than 100 °C into electric power. In the present work an overview of the possible regeneration methods is presented and the technological challenges for the development of the RED Heat Engine (REDHE) are identified. The potential of this power production cycle was investigated through a simplified mathematical model. In the first part of the work, several salts were singularly modelled as possible solutes in aqueous solutions feeding the RED unit and the corresponding optimal conditions were recognized via an optimization study. In the second part, three different RED He…

Teachers’ responses to children in emotional distress: A study of co-regulation in the first year of primary school in Norway

2020

The purpose of this study was to explore how first-grade teachers respond to pupils in emotional distress within the framework of co-regulation. Co-regulation in this context refers to an adult–chi...

Codificazione e decodificazione: riflessioni in prospettiva euopea sulle ragioni sociali, economiche e culturali della crisi del modello dello stato …

2013

Obstacles modelling reality: Two exploratory studies on physics defined and undefined problems

2014

For some researchers, and perhaps for many teachers, problem-solving is strongly related to thinking (Mayer, 1983). Several reports highlight the importance of developing suitable skills to solve complex, ill-defined and boundless real-life problems in educated people (NSF Standards, U.S. Department of Labour, ABET engineering accreditation organization, and American Institute of Physics, mentioned in Etkina & Van Heuvelen, 2007; Bureau of Labour Statistics, U.S. Department of Labour, 2014; Competency Model Clearinghouse, 2012). Problem-solving is virtually the core of the professional activity of a physicist (Etkina, Van Heuvelen, White-Brahmia, Brookes, Gentile, Murthy, Rosengrant & Warre…

Modeling Developmental Processes in Psychology

2013

In the present article I suggest first that modeling in psychology can be described as an interactive process between a phenomenon under study (reality) and different levels of theoretical conceptualizations that vary in respect to how directly they can be related to empirical observations and at what level of generalization they operate. Then, I give three examples of my own work concerning building theories and testing models. Next, I discuss some caveats scientists face when building theories and models on the basis of their observations. Finally, I make a few conclusions on the basis of the article. peerReviewed

A commentary on the Special Issue “Innovations in measuring and fostering mathematical modelling competencies”

2021

This is a commentary on the ESM 2021 Special Issue on Innovations in Measuring and Fostering Mathematical Modelling Competencies. We have grouped the ten studies into three themes: competencies, fostering, and measuring. The first theme and the papers therein provide a platform to discuss the cognitivist backgrounds to the different conceptualizations of mathematical modelling competencies, based on the modelling cycle. We suggest theoretical widening through a competence continuum and enriching of the modelling cycle with overarching, analytic dimensions for creativity, tool use, metacognition, and so forth. The second theme and the papers therein showcase innovative ideas on fostering an…

A comparison analysis between unsymmetric and symmetric radial basis function collocation methods for the numerical solution of partial differential …

2002

Abstract In this article, we present a thorough numerical comparison between unsymmetric and symmetric radial basis function collocation methods for the numerical solution of boundary value problems for partial differential equations. A series of test examples was solved with these two schemes, different problems with different type of governing equations, and boundary conditions. Particular emphasis was paid to the ability of these schemes to solve the steady-state convection-diffusion equation at high values of the Peclet number. From the examples tested in this work, it was observed that the system of algebraic equations obtained with the symmetric method was in general simpler to solve …

Cupola

2004

La Cupola (o “Commissione”, come è stata indicata dai collaboratori di giustizia) indica la struttura di governo di Cosa Nostra. A partire dal 1987, le indagini sulla configurazione dell’organizzazione mafiosa siciliana riferiscono di un modello a struttura unitaria e verticistica, in grado di esercitare un controllo capillare sul territorio secondo criteri rispondenti al principio di suddivisione in aree geografiche. Al suo interno, le macro-unità sono rappresentate dalle cosiddette province, sulle quali governano i capi-provincia, riuniti in forma collegiale in un organo di coordinamento denominato regione o interprovinciale. Tra gli organi di governo su base provinciale, la più attiva e …