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Browsing by Author "Ginestar Peiro, Damián"

Now showing items 1-20 of 97

A block Arnoldi method for the SPN equations

Vidal-Ferràndiz, Antoni; Carreño, Amanda; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (Taylor & Francis, 2020-02-01)

[EN] The simplified spherical harmonics equations are a useful approximation to the stationary neutron transport equation. The eigenvalue problem associated with them is a challenging problem from the computational point ...
A Ciliary Motility Index for Activity Measurement in Cell Cultures With Respiratory Syncytial Virus

Parrilla Bernabé, Eduardo; Armengot, Miguel; Mata, Manuel; Carda, Carmen; Cortijo, Julio; Moratal, David; Ginestar Peiro, Damián; Hueso, José L.; Riera Guasp, Jaime (SAGE Publishing, 2019-03-01)

[EN] Background: The respiratory epithelium is frequently infected by the respiratory syncytial virus, resulting in inflammation, a reduction in cilia activity and an increase in the production of mucus. Methods: In this ...
A finite element method for neutron noise analysis in hexagonal reactors

Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Carreño, Amanda; Verdú Martín, Gumersindo Jesús; Demazière, C. (EDP Sciences, 2021-02-22)

[EN] The early detection of anomalies through the analysis of the neutron noise recorded by in-core and ex-core instrumentation gives the possibility to take proper actions before such problems lead to safety concerns or ...
A multigrid method to compute the dominant lambda modes of a nuclear reactor

Carreño, Amanda; Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (International Center for Numerical Methods in Engineering (CIMNE), 2017-07-05)

[EN] High accuracy is required for the solution of the lambda modes problem associated with the neutron diffusion equation. In this work, a multigrid method based on finite element method has been proposed to solve this ...
A study of the radiative transfer equation using a spherical harmonics-nodal collocation method

Capilla Romá, Maria Teresa; Talavera Usano, César Félix; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (Elsevier, 2017)

[EN] Optical tomography has found many medical applications that need to know how the photons interact with the different tissues. The majority of the photon transport simulations are done using the diffusion approximation, ...
A time and frequency domain analysis of the effect of vibrating fuel assemblies on the neutron noise

Vidal-Ferràndiz, Antoni; Carreño, Amanda; Ginestar Peiro, Damián; Demazière, C.; Verdú Martín, Gumersindo Jesús (Elsevier, 2020-03)

[EN] The mechanical vibrations of fuel assemblies have been shown to give rise to high levels of neutron noise, triggering in some circumstances the necessity to operate nuclear reactors at a reduced power level. This work ...
Adaptive modal methods to integrate the neutron diffusion equation

Carreño, Amanda; Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (R. Company, J. C. Cortés, L. Jódar and E. López-Navarro, 2019-07-12)
Adaptive time-step control for modal methods to integrate the neutron diffusion equation

Carreño, Amanda; Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (Elsevier, 2021-02)

[EN] The solution of the time-dependent neutron diffusion equation can be approximated using quasi-static methods that factorise the neutronic flux as the product of a time dependent function times a shape function that ...
Adaptive time-step control for the modal method to integrate the multigroup neutron diffusion equation

Carreño, Amanda; Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (EDP Sciences, 2021-02-22)

[EN] The distribution of the power inside a reactor core can be described by the time dependent multigroup neutron diffusion equation. One of the approaches to integrate this time-dependent equation is the modal method, ...
Analysis of the PHWR benchmark transient using a high-order spherical harmonics-nodal collocation method and treatment of rod cusping effect

Capilla Romá, Maria Teresa; Talavera Usano, César Félix; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (Elsevier, 2021-05)

[EN] We develop and validate node homogenization methods, based on one and three-dimensional node equivalent problems, that improve the volume weighted method for the treatment of the rod cusping effect. The numerical ...
Análisis de estabilidad en el reactor BWR Ringhals 1 con los códigos acoplados RELAP5/PARCS V2.7

Abarca Giménez, Agustín; Barrachina Celda, Teresa María; Miró Herrero, Rafael; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (Grupo Senda, 2011-09)

En este trabajo, se ha realizado un análisis de estabilidad en los puntos de operación definidos en el bechmark de estabilidad de la central nuclear de Ringhals. Se quieren reproducir los resultados obtenidos en el ...
Aplicación de la Transformada de Laplace a la resolución de problemas de valores iniciales

Coll Aliaga, Peregrina del Carmen; Sanabria Codesal, Esther; Ginestar Peiro, Damián; Sánchez Juan, Elena (Universitat Politècnica de València, 2017-05-15)

En este objeto de aprendizaje se le presenta al alumno aplicaciones de la transformada de Laplace a la resolución de ecuaciones diferenciales con condiciones iniciales. Se utiliza el programa Mathematica para realizar los ...
Application of a nodal collocation approximation for the multidimensional P-L equations to the 3D Takeda benchmark problems

Capilla Romá, Maria Teresa; Talavera Usano, César Félix; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (Elsevier Masson, 2012-02)

PL equations are classical approximations to the neutron transport equations, which are obtained expanding the angular neutron flux in terms of spherical harmonics. These approximations are useful to study the behavior of ...
Approximation of the Neutron Diffusion Equation on Hexagonal Geometries

González Pintor, Sebastián (Universitat Politècnica de València, 2012-11-16)

La ecuación de la difusión neutrónica describe la población de neutrones de un reactor nuclear. Este trabajo trata con este modelo para reactores nucleares con geometría hexagonal. En primer lugar se estudia la ecuación ...
Approximation of The Neutron Diffusion Equation on Hexagonal Geometries Using a h-p finite element method

Fayez Moustafa Moawad, Ragab (Universitat Politècnica de València, 2016-06-07)

[EN] The neutron diffusion equation is an approximation of the neutron transport equation that describes the neutron population in a nuclear reactor core. In particular, we will consider here VVER-type reactors which use ...
Assessment of LEACHN and a simple compartmental model to simulate nitrogendynamics in citrus orchards

Lidón Cerezuela, Antonio Luis; Ramos Mompó, Carlos; Ginestar Peiro, Damián; Contreras Espinosa, Wilson Alberto (Elsevier Masson, 2013-04)

A simple compartmental model using a tipping bucket approach for the water dynamics coupled with a nitrogen¿carbon transformations model has been adapted to simulate the soil nitrogen and water balance in mature orange ...
Block hybrid multilevel method to compute the dominant lambda-modes of the neutron diffusion equation

Carreño, A.; Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (Elsevier, 2018)

[EN] The dominant lambda-modes associated with a nuclear reactor configuration describe the neutron steady-state distribution and its criticality. Furthermore, they are useful to develop modal methods to study reactor ...
Block Preconditioning Matrices for the Newton Method to Compute the Dominant lambda-Modes Associated with the Neutron Diffusion Equation

Carreño, Amanda; Bergamaschi, Luca; Martinez, Angeles; Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Verdú Martín, Gumersindo Jesús (MDPI AG, 2019-03)

[EN] In nuclear engineering, the lambda-modes associated with the neutron diffusion equation are applied to study the criticality of reactors and to develop modal methods for the transient analysis. The differential ...
Comments on "SPICE Model of Photomultiplier Tube Under Different Bias Conditions"

Hueso-González, Fernando; Ginestar Peiro, Damián; Hueso Pagoaga, José Luís; Riera Guasp, Jaime (Institute of Electrical and Electronics Engineers, 2021-08-01)

[EN] The paper ¿SPICE Model of Photomultiplier Tube Under Different Bias Conditions¿ is commented. We revisit the mathematical formulation to compensate for some ambiguities in the original manuscript, and point out some ...
Compresión de imágenes mediante la descomposición en valores singulares

Hueso Pagoaga, José Luís; Ginestar Peiro, Damián; Riera Guasp, Jaime (Universitat Politècnica de València, 2015-06-05)

En la imagen digital, la intensidad de cada pixel se almacena en una matriz. Mediante la descomposicion en valores singulares, se consigue analizar las variaciones de la intensidad y expresar la matriz como suma de productos ...