Search results for "T method"

CALIBRATION OF LÉVY PROCESSES USING OPTIMAL CONTROL OF KOLMOGOROV EQUATIONS WITH PERIODIC BOUNDARY CONDITIONS

2018

We present an optimal control approach to the problem of model calibration for L\'evy processes based on a non parametric estimation procedure. The calibration problem is of considerable interest in mathematical finance and beyond. Calibration of L\'evy processes is particularly challenging as the jump distribution is given by an arbitrary L\'evy measure, which form a infinite dimensional space. In this work, we follow an approach which is related to the maximum likelihood theory of sieves. The sampling of the L\'evy process is modelled as independent observations of the stochastic process at some terminal time $T$. We use a generic spline discretization of the L\'evy jump measure and selec…

The beta-delayed proton and gamma decay of 27P for nuclear astrophysics

2013

The creation site of 26Al is still under debate. It is thought to be produced in hydrogen burning and in explosive helium burning in novae and supernovae, and possibly also in the H-burning in outer shells of red giant stars. Also, the reactions for its creation or destruction are not completely known. When 26Al is created in novae, the reaction chain is: 24Mg(p, γ) 25Al(β +ν) 25Mg(p, γ) 26Al, but this chain can be by-passed by another chain, 25Al(p, γ) 26Si(p, γ) 27P and it can also be destroyed directly. The reaction 26mAl(p, γ) 27Si∗ is another avenue to bypass the production of 26Al and it is dominated by resonant capture. We find and study these resonances by an indirect method, throug…

Functional a posteriori error estimates for boundary element methods

2019

Functional error estimates are well-established tools for a posteriori error estimation and related adaptive mesh-refinement for the finite element method (FEM). The present work proposes a first functional error estimate for the boundary element method (BEM). One key feature is that the derived error estimates are independent of the BEM discretization and provide guaranteed lower and upper bounds for the unknown error. In particular, our analysis covers Galerkin BEM and the collocation method, what makes the approach of particular interest for scientific computations and engineering applications. Numerical experiments for the Laplace problem confirm the theoretical results.

BEM analysis of a piezoelectric structural health monitoring system for delamination detection

2013

In the present work a piezoelectric based structural health monitoring (SHM) system is analyzed with the aim of assessing the ability of the piezoelectric patch to detect both edge and embedded delaminations proper of flange-skin composite laminated structures. he boundary element model is developed for piezoelectric solids and is implemented by taking advantage of the multidomain technique to model laminated and cracked configurations. A non-linear spring model interface is then implemented in conjunction with an iterative procedure allowing for the simulation of the finite stiffness of the bonding layers as well as of the non-penetration condition of the delamination surfaces. he dynamic …

COMPUTATIONAL HOMOGENIZATION OF POLYCRYSTALLINE MATERIALS WITH PORES: A THREE-DIMENSIONAL GRAIN BOUNDARY FORMULATION

2012

In this study, the influence of porosity on the elastic effective properties of polycrystalline materials is investigated using a 3D grain boundary micro mechanical model. The volume fraction of pores, their size and distribution can be varied to better simulate the response of real porous materials. The formulation is built on a boundary integral representation of the elastic problem for the grains, which are modeled as 3D linearly elastic orthotropic domains with arbitrary spatial orientation. The artificial polycrystalline morphology is represented using 3D Voronoi Tessellations. The formulation is expressed in terms of intergranular fields, namely displacements and tractions that play …

PROCESSO CONSERVATIVO E SIGNIFICATIVITà UN APPROCCIO METODOLOGICO PER LA PROGETTAZIONE DEI SISTEMI DI PROTEZIONE NEI SITI ARCHEOLOGICI/CONSERVATION P…

2018

Patrimonio culturale in generale e dei beni archeologici in particolare, in ragione della loro duplice natura (materiale e immateriale) e coerentemente con l’interesse della Cultura tecnologica per la centralità di quegli aspetti di processo che sono determinanti per una loro adeguata valorizzazione e ampia fruizione, il presente contributo propone un modello di valutazione per capire ‘cosa’ conservare e ‘per- ché’ nell’ottica di uno sviluppo sostenibile, ancor prima di ‘come’ farlo, consentendo una più chiara lettura e una più agevole interpretazione delle complesse relazioni esistenti fra le preesistenze archeologiche, il contesto naturale e i sistemi antropici aggiunti. Il modello di val…

Ocena opłacalności projektów inwestycyjnych z zastosowaniem skierowanych liczb rozmytych

2015

Starpskolu projektu metode 5. klases sadarbības prasmju attīstībai angļu valodā

2021

Grupu darbs ir būtisks jaunākā vecumposma pusaudžu sadarbības prasmju attīstības sekmēšanai. Tomēr reģionu skolās ir ierobežotas iespējas grupu veidošanai angļu valodas stundās skolēnu skaita dēļ vienā klasē. Tas ir izaicinājums skolotājiem, lai nodrošinātu iespējas skolēniem gūt reāla grupu darba pieredzi prasmju attīstībai. Lai attīstītu skolēnu sadarbības prasmes, diplomdarba autores pētījumā izmantoja starpskolu projekta metodi. Gadījuma pētījums tika veikts, iesaistot 5. klases skolēnus no divām reģiona skolām. Tika izmantotas šādas datu vākšanas metodes: skolotāju žurnāls, skolēnu projekta darba pierādījumi, atsauksmes un refleksijas par projekta gaitu un anketa. Pētījumu rezultāti pi…

Starpskolu projektu metode 5. klases sadarbības prasmju attīstībai angļu valodā

2021

Grupu darbs ir būtisks jaunākā vecumposma pusaudžu sadarbības prasmju attīstības sekmēšanai. Tomēr reģionu skolās ir ierobežotas iespējas grupu veidošanai angļu valodas stundās skolēnu skaita dēļ vienā klasē. Tas ir izaicinājums skolotājiem, lai nodrošinātu iespējas skolēniem gūt reāla grupu darba pieredzi prasmju attīstībai. Lai attīstītu skolēnu sadarbības prasmes, diplomdarba autores pētījumā izmantoja starpskolu projekta metodi. Gadījuma pētījums tika veikts, iesaistot 5. klases skolēnus no divām reģiona skolām. Tika izmantotas šādas datu vākšanas metodes: skolotāju žurnāls, skolēnu projekta darba pierādījumi, atsauksmes un refleksijas par projekta gaitu un anketa. Pētījumu rezultāti pi…

A Hundred Years of the Project Method in Poland

2017

The text presents the development of the project method in Polish education throughout the last century. The project method was introduced in Poland afiter regaining independence, and (1918-1939) it was implemented during the inter-war period in some schools both in urban and rural environments. Nevertheless, the method was at that time treated as a pedagogical novelty and experiment rather than a natural part of school life. After 1945, education, as other aspects of socio-political life, was influenced by the communist propaganda, and the project method supporting autonomy, democracy and empowerment was not promoted as a valuable educational approach. After 1989, when progressive trends a…