Search results for "on-line"
showing 10 items of 206 documents
Random analysis of geometrically non-linear FE modelled structures under seismic actions
1990
Abstract In the framework of the finite element (FE) method, by using the “total Lagrangian approach”, the stochastic analysis of geometrically non-linear structures subjected to seismic inputs is performed. For this purpose the equations of motion are written with the non-linear contribution in an explicit representation, as pseudo-forces, and with the ground motion modelled as a filtered non-stationary white noise Gaussian process, using a Tajimi-Kanai-like filter. Then equations for the moments of the response are obtained by extending the classical Ito's rule to vectors of random processes. The equations of motion, and the equations for moments, obtained here, show a perfect formal simi…
On the optimal approximation rate of certain stochastic integrals
2010
AbstractGiven an increasing function H:[0,1)→[0,∞) and An(H)≔infτ∈Tn(∑i=1n∫ti−1ti(ti−t)H(t)2dt)12, where Tn≔{τ=(ti)i=0n:0=t0<t1<⋯<tn=1}, we characterize the property An(H)≤cn, and give conditions for An(H)≤cnβ and An(H)≥1cnβ for β∈(0,1), both in terms of integrability properties of H. These results are applied to the approximation of stochastic integrals.
E-Learning Experiences in La Ribera Health Department
2014
This paper shows how the training of health professionals is improving thanks to the use of new technologies, in particular e-learning. This type of technology is widely used in medical education and there are multiple research works that report its effective deployment by health professionals and students. However, there is a need to incorporate e-learning platforms and online methods in healthcare organizations through a systematic and rigorous approach what is proposed in the current work. This approach has been applied since 2009 in the context of La Ribera Health Department implementing a high number of e-learning experiences. The obtained outcomes reveal how useful have been these exp…
Dall'asincrono al sincrono: buone pratiche per l'apprendimento on-line
2009
La diffusione degli ambienti di blended elearning nei corsi universitari è sempre maggiore Sorge la necessità di individuare delle pratiche che possono consentire il raggiungimento di adeguate competenze anche tramite una interazione più assidua e diretta tra studenti e docenti/tutor. Si è ritenuto di esaminare più in dettaglio i risultati di apprendimento e l’acquisizione di competenze analizzando percorsi sostenuti da interazioni ( a distanza) solo asincrone e percorsi sostenuti da interazioni (a distanza) sincrone. La ricerca ha messo a fuoco le caratteristiche della comunicazione asincrona, in ambiente blended e-learning, più significative ai fini degli obiettivi di apprendimento; quind…
Time-dependent density-functional theory in the projector augmented-wave method
2008
We present the implementation of the time-dependent density-functional theory both in linear-response and in time-propagation formalisms using the projector augmented-wave method in real-space grids. The two technically very different methods are compared in the linear-response regime where we found perfect agreement in the calculated photoabsorption spectra. We discuss the strengths and weaknesses of the two methods as well as their convergence properties. We demonstrate different applications of the methods by calculating excitation energies and excited state Born–Oppenheimer potential surfaces for a set of atoms and molecules with the linear-response method and by calculating nonlinear e…
Presentació del lèxic bàsic Grec-Català
2016
Atesa la dificultat de molts estudiants de primer curs de Filologia Clàssica per consultar àgilment diccionaris i adquirir un vocabulari bàsic, presentem el Lèxic bàsic grec-català amb més de 800 paraules de l'oratòria judicial de Lísias i Iseu i d'alguns textos narratius de Xenofont. Es pot consultar lliurement on-line i imprimir fàcilment, consta d'una traducció catalana de les accepcions més comunes del mot i informació morfosintàctica bàsica a més d'un aparat amb els derivats catalans.
Mixed heuristic-non linear optimization of energy management for hydrogen storage-based multi carrier hubs
2014
In this paper, an heuristic and non-linear programming based algorithm to optimally operate an energy hub plant is proposed. The energy hub plant described in this work is the test system for the European INGRID research project. The Energy Management System defines the optimal energy flows dispatch in order to obtain the energy balance and the maximum profit for the owner of the plant. The problem is highly constrained and non-linear, for this reason the methodology cannot rely on Linear Programming (LP) methods. The Energy Management System manages two energy carriers, electricity and hydrogen, interfacing three distribution networks: the electricity, the hydrogen and the methane networks…
Design of Wideband MIMO Car-to-Car Channel Models Based on the Geometrical Street Scattering Model
2012
Published version of an article in the journal: Modelling and Simulation in Engineering. Also available from the publisher at: http://dx.doi.org/10.1155/2012/264213 Open access We propose a wideband multiple-input multiple-output (MIMO) car-to-car (C2C) channel model based on the geometrical street scattering model. Starting from the geometrical model, a MIMO reference channel model is derived under the assumption of single-bounce scattering in line-of-sight (LOS) and non-LOS (NLOS) propagation environments. The proposed channel model assumes an infinite number of scatterers, which are uniformly distributed in two rectangular areas located on both sides of the street. Analytical solutions a…
FDTD simulation for electromagnetic radiated emissions in 42 V vehicle electrical systems
2005
In this paper a full 3D approach, based on finite difference time domain method, is used to predict the electromagnetic radiated emissions from 42 V vehicle electrical loads. An experimental set-up has been arranged on purpose. A comparative analysis among measured and computed results is performed. The good agreement obtained among simulated and measured data enables to validate the numerical scheme. The proposed methodology contributes to predict electromagnetic emissions in the automotive environment since the design stage. Moreover, the proposed numerical tool can be used to define, for new vehicle electrical architectures, low cost test methods for electromagnetic compatibility and sui…