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Listar por autor "Verdú Martín, Gumersindo Jesús"

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6 and 15 MeV photon spectra reconstruction using an unfolding depth dose gradient methodology

Juste Vidal, Belen Jeanine; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús; Diez Domingo, Sergio; Campayo Esteban, Juan Manuel (Institute of Electrical and Electronics Engineers, 2011)

[EN] An accurate knowledge of the spectral distribution emission is essential for precise dose calculations in radiotherapy treatment planning. Reconstruction of photon spectra emitted by medical accelerators from measured ...
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 comparative study of boron transport models in NRC thermal-hydraulic code TRACE

Olmo-Juan, Nicolás; Barrachina Celda, Teresa María; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús; Pereira, C. (Sociedade Brasileira de Proteção Radiológica, 2019)

[EN] Recently, the interest in the study of various types of transients involving changes in the boron concentration inside the reactor, has led to an increase in the interest of developing and studying new models and tools ...
A comparative study of computer assited assessment of image quality index for mammographic phantom images

Mayo Nogueira, Patricia; Ródenas Escribá, Francisco De Asís; Verdú Martín, Gumersindo Jesús; Villaescusa, J.I; Campayo, Juan Manuel (Oxford University Press, 2005-12-20)

[EN] Mammographic phantom images are usually used to study the quality of images obtained by dedicated mammographic equipment. The digital image treatment techniques allow us to carry out an automatic analysis of the phantom ...
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 hybrid genetic algorithm to reduce the radiation dose in CR images

Sánchez, M. G.; Fajardo-Delgado, D.; Vidal-Gimeno, Vicente-Emilio; Verdú Martín, Gumersindo Jesús (Elsevier, 2020-02)

[EN] The quality of computed radiography (CR) images typically relate to patient radiation exposure. The lower the X-ray dose exposure, the higher the level of inherent noise in the CR images. In this work, we address the ...
A Krylov-Schur solution of the eigenvalue problem for the neutron diffusion equation discretized with the Raviart-Thomas method

Bernal-Garcia, Alvaro; Hébert, Alain; Roman, Jose E.; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús (Taylor & Francis, 2017)

[EN] Mixed-dual formulations of the finite element method were successfully applied to the neutron diffusion equation, such as the Raviart¿Thomas method in Cartesian geometry and the Raviart¿Thomas¿Schneider in hexagonal ...
A multi-scale and multi-physics simulation methodology with the state-of-the-art tools for safety analysis in light water reactors applied to a turbine trip scenario (PART I)

Hidalga-García-Bermejo, Patricio; Abarca Giménez, Agustín; Miró Herrero, Rafael; SEKHRI, ABDELKRIM; Verdú Martín, Gumersindo Jesús (Elsevier, 2019-08-15)

[EN] The simulation of transient events is a requirement in the evaluation of the safety of Nuclear Power Plants. The Nuclear Authority request the operators to report the prediction of the evolution of the corresponding ...
A multi-scale and multi-physics simulation methodology with the state-of-the-art tools for safety analysis in Light Water Reactors applied to a Turbine Trip scenario (Part II)

Hidalga-García-Bermejo, Patricio; Abarca Giménez, Agustín; Miró Herrero, Rafael; SEKHRI, ABDELKRIM; Verdú Martín, Gumersindo Jesús (Elsevier, 2019-08-15)

[EN] The development of the computer technology, as well as the research in the different science fields governing the core behavior of a Light Water Reactor, allows implementing all the known physics and consider detailed ...
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 new methodology to determinate linac photon spectra using the EPID signal

Juste Vidal, Belen Jeanine; Miró Herrero, Rafael; Jambrina Gómez, Ana; Campayo Esteban, Juan Manuel; Diez Domingo, Sergio; Verdú Martín, Gumersindo Jesús (Elsevier, 2014-02)

A precise estimation of the photon spectra emitted by radiation therapy Linacs is especially important to accurately estimate the dose received by patients in order to improve treatment plannings. Moreover the knowledge ...
A review of refrigerant R1234ze(E) recent investigations

Mota-Babiloni, Adrián; Navarro-Esbrí, J.; Molés, Francisco; Barragán Cervera, Ángel; Peris, Bernardo; Verdú Martín, Gumersindo Jesús (Elsevier, 2016)

[EN] Climate change is demonstrated through global surface temperatures increase in the last century. To stop this phenomenon, new regulations that ban or tax greenhouse gas fluids (HFC among them) have been approved. In ...
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 ...
Acoplamiento de los códigos TRACBF1/PARCSv2.7 en Linux sin interfaz externa de comunicación

Barrachina Celda, Teresa María; García Fenoll, Marina; Abarca Giménez, Agustín; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús; Concejal, A.; Soler, A. (Grupo Senda, 2014)

[ES] El código TRAC-BF1 sigue siendo ampliamente utilizado por la industria nuclear para análisis de seguridad. Los modelos de planta desarrollados con este código termohidráulico están sumamente validados, por lo que ...
Actualización del modelo de calor de decaimiento en los códigos TRAC-BF1 y PARCS para la simulación en modo stand-alone y acoplado de transitorios 3D

Jambrina Gómez, Ana; Barrachina Celda, Teresa María; Soler, A.; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús; Concejal, Alberto (Grupo Senda, 2013)

En el análisis de seguridad nuclear, es muy importante ser capaz de simular los diferentes transitorios que pueden ocurrir en una planta nuclear con una alta precisión. Las simulaciones transitorias implican ...
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, ...
Air radon concentration decrease in a waste water treatment plant

Juste Vidal, Belen Jeanine; Ortiz Moragón, Josefina; Verdú Martín, Gumersindo Jesús; Martorell Alsina, Sebastián Salvador (Oxford University Press, 2015-06)

Rn-222 is a naturally occurring gas created from the decay of Ra-226. The long-term health risk of breathing radon is lung cancer. One particular place where indoor radon concentrations can exceed national guidelines is ...