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Vidal-Ferràndiz A, Ginestar D, Carreño A, Verdú G, Dokhane A, Verma V, Perin Y, Herb J, Mylonakis A, Demazière C, Vinai P. Modelling and simulations of reactor neutron noise induced by mechanical vibrations. ANN NUCL ENERGY 2022. [DOI: 10.1016/j.anucene.2022.109300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Milián-Sánchez V, Iglesias-Martínez ME, Scholkmann F, de Córdoba PF, Castro-Palacio JC, Sahu S, Mocholí A, Mocholí F, Verdú G, Kolombet VA, Panchelyuga VA. Reply to: Role of ambient humidity underestimated in research on correlation between radioactive decay rates and space weather. Sci Rep 2022; 12:2530. [PMID: 35169181 PMCID: PMC8847582 DOI: 10.1038/s41598-022-06179-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 01/25/2022] [Indexed: 11/30/2022] Open
Affiliation(s)
- Víctor Milián-Sánchez
- Institute for Industrial, Radiophysical and Environmental Safety, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain.
| | - Miguel E Iglesias-Martínez
- Grupo de Modelización Interdisciplinar, InterTech, Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain
| | - Felix Scholkmann
- Research Office for Complex Physical and Biological Systems, 8006, Zurich, Switzerland.
| | - Pedro Fernández de Córdoba
- Grupo de Modelización Interdisciplinar, InterTech, Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain
| | - Juan C Castro-Palacio
- Grupo de Modelización Interdisciplinar, InterTech, Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain.,Department of Electrical Engineering, Electronics, Automation, and Applied Physics, Technical University of Madrid, Ronda de Valencia, 3, 28012, Madrid, Spain
| | - Sarira Sahu
- Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, C.U., A. Postal 70-543, 04510, Mexico, DF, Mexico
| | - Antonio Mocholí
- Traffic Control Systems Group, ITACA Institute, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain
| | - Ferrán Mocholí
- Traffic Control Systems Group, ITACA Institute, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain
| | - G Verdú
- Institute for Industrial, Radiophysical and Environmental Safety, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain.,Chemical and Nuclear Engineering Department, Universitat Politècnica de València, Camino de Vera, s/n, 46022, Valencia, Spain
| | - Valeriy A Kolombet
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Science, Moscow Region, Pushchino, Russia, 142290
| | - Victor A Panchelyuga
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Science, Moscow Region, Pushchino, Russia, 142290
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Carreño A, Vidal-Ferràndiz A, Ginestar D, Verdú G. Time-dependent simplified spherical harmonics formulations for a nuclear reactor system. Nuclear Engineering and Technology 2021. [DOI: 10.1016/j.net.2021.06.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Morató S, Kochunas B, Miró R, Verdú G, Larsen E, Downar T. Lambda modes comparison for different approximations of the neutron transport equation: Diffusion, SN and SP3. ANN NUCL ENERGY 2021. [DOI: 10.1016/j.anucene.2020.108074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Capilla M, Talavera C, Ginestar D, Verdú G. Analysis of the PHWR benchmark transient using a high-order spherical harmonics-nodal collocation method and treatment of rod cusping effect. Progress in Nuclear Energy 2021. [DOI: 10.1016/j.pnucene.2021.103701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Vidal-Ferràndiz A, Ginestar D, Carreño A, Verdú G, Demazière C. A FINITE ELEMENT METHOD FOR NEUTRON NOISE ANALYSIS IN HEXAGONAL REACTORS. EPJ Web Conf 2021. [DOI: 10.1051/epjconf/202124721007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The early detection of anomalies through the analysis of the neutron noise recorded by incore and ex-core instrumentation gives the possibility to take proper actions before such problems lead to safety concerns or impact plant availability. The study of the neutron fluctuations permits to detect and differentiate anomalies depending on their type and possibly to characterize and localize such anomalies. This method is non-intrusive and does not require any external perturbation of the system. To effectively use the neutron noise for reactor diagnostics it is essential to accurately model the effects of the anomalies on the neutron field. This paper deals with the development and validation of a neutron noise simulator for reactors with different geometries. The neutron noise is obtained by solving the frequency-domain two-group neutron diffusion equation in the first order approximation. In order to solve this partial differential equation a code based on a high order finite element method is developed. The novelty of this simulator resides on the possibility of dealing with rectangular meshes in any kind of geometry, thus allowing for complex domains and any location of the perturbation. The finite element method also permits automatic refinements in the cell size (h-adaptability) and in its polynomial degree (p-adaptability) that lead to a fast convergence. In order to show the possibilities of the neutron noise simulator developed a perturbation in a hexagonal two-dimensional reactor is investigated in this paper.
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Carreño A, Vidal-Ferràndiz A, Ginestar D, Verdú G. ADAPTIVE TIME-STEP CONTROL FOR THE MODAL METHOD TO INTEGRATE THE MULTIGROUP NEUTRON DIFFUSION EQUATION. EPJ Web Conf 2021. [DOI: 10.1051/epjconf/202124707010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
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, that assumes that the solution can be described by the sum of amplitude function multiplied by shape functions of modes. These shape functions can be computed by solving a _-modes problems. The modal method has a great interest when the distribution of the power cannot be well approximated by only one shape function, mainly, when local perturbations are applied during the transient. Usually, the shape functions of the modal methods are updated for the time-dependent equations with a constant time-step size to obtain accurate results. In this work, we propose a modal methodology with an adaptive control time-step to update the eigenfunctions associated with the modes. This algorithm improves efficiency because of time is not spent solving the systems to a level of accuracy beyond relevance and reduces the step size if they detect a numerical instability. Step size controllers require an error estimation. Different error estimations are considered and analyzed in a benchmark problem with a out of phase local perturbation.
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Lorduy-Alós M, Gallardo S, Verdú G. Scaling analysis of an IBLOCA counterpart test between the ATLAS and LSTF facilities. Progress in Nuclear Energy 2020. [DOI: 10.1016/j.pnucene.2020.103460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Juste B, Miró R, Morató S, Verdú G, Peris S. Prostate cancer Monte Carlo dose model with 177Lutetium and 125Iodine treatments. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108908] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Korepanova N, Pepelyshev Y, Tkachenko I, Verdú G. Application of Töplitz matrices to neutron noise diagnostics of the IBR-2M pulsed reactor. Progress in Nuclear Energy 2020. [DOI: 10.1016/j.pnucene.2020.103463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Mesado C, Miró R, Verdú G. Methodology for neutronic uncertainty propagation and application to a UAM-LWR benchmark. Progress in Nuclear Energy 2020. [DOI: 10.1016/j.pnucene.2020.103389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Noverques A, Juste B, Sancho M, García-Fayos B, Verdú G. Study of the influence of radon in water on radon levels in air in a closed location. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108761] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Milián-Sánchez V, Scholkmann F, Fernández de Córdoba P, Mocholí-Salcedo A, Mocholí F, Iglesias-Martínez ME, Castro-Palacio JC, Kolombet VA, Panchelyuga VA, Verdú G. Fluctuations in measured radioactive decay rates inside a modified Faraday cage: Correlations with space weather. Sci Rep 2020; 10:8525. [PMID: 32444614 PMCID: PMC7244597 DOI: 10.1038/s41598-020-64497-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 04/13/2020] [Indexed: 11/29/2022] Open
Abstract
For several years, reports have been published about fluctuations in measured radioactive decay time-series and in some instances linked to astrophysical as well as classical environmental influences. Anomalous behaviors of radioactive decay measurement and measurement of capacitance inside and outside a modified Faraday cage were documented by our group in previous work. In the present report, we present an in-depth analysis of our measurement with regard to possible correlations with space weather, i.e. the geomagnetic activity (GMA) and cosmic-ray activity (CRA). Our analysis revealed that the decay and capacitance time-series are statistically significantly correlated with GMA and CRA when specific conditions are met. The conditions are explained in detail and an outlook is given on how to further investigate this important finding. Our discovery is relevant for all researchers investigating radioactive decay measurements since they point out that the space weather condition during the measurement is relevant for partially explaining the observed variability.
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Affiliation(s)
- V Milián-Sánchez
- Institute for Industrial, Radiophysical and Environmental Safety, Universitat Politècnica de València, Camino de Vera, s/n, 46022, València, Spain
| | - F Scholkmann
- Research Office for Complex Physical and Biological Systems, 8006, Zurich, Switzerland.
| | - P Fernández de Córdoba
- Grupo de Modelización Interdisciplinar, InterTech, Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Camino de Vera, s/n, 46022, València, Spain
| | - A Mocholí-Salcedo
- Traffic Control Systems Group, ITACA Institute, Universitat Politècnica de València, Camino de Vera, s/n, 46022, València, Spain
| | - F Mocholí
- Traffic Control Systems Group, ITACA Institute, Universitat Politècnica de València, Camino de Vera, s/n, 46022, València, Spain
| | - M E Iglesias-Martínez
- Grupo de Modelización Interdisciplinar, InterTech, Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Camino de Vera, s/n, 46022, València, Spain
| | - J C Castro-Palacio
- Grupo de Modelización Interdisciplinar, InterTech, Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Camino de Vera, s/n, 46022, València, Spain
| | - V A Kolombet
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Science, Moscow Region, Pushchino, 142290, Russia
| | - V A Panchelyuga
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Science, Moscow Region, Pushchino, 142290, Russia
| | - G Verdú
- Institute for Industrial, Radiophysical and Environmental Safety, Universitat Politècnica de València, Camino de Vera, s/n, 46022, València, Spain
- Chemical and Nuclear Engineering Department, Universitat Politécnica de València, Camino de Vera, s/n, 46022, València, Spain
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Affiliation(s)
- A. Vidal-Ferràndiz
- Universitat Politècnica de València, Camí de Vera s/n, València 46022, Spain
| | - A. Carreño
- Universitat Politècnica de València, Camí de Vera s/n, València 46022, Spain
| | - D. Ginestar
- Universitat Politècnica de València, Camí de Vera s/n, València 46022, Spain
| | - C. Demazière
- Chalmers University of Technology, Department of Physics, Division of Subatomic and Plasma Physics, Gothenburg SE-412 96, Sweden
| | - G. Verdú
- Universitat Politècnica de València, Camí de Vera s/n, València 46022, Spain
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Morató S, Bernal Á, Miró R, Roman JE, Verdú G. Calculation of λ modes of the multi-group neutron transport equation using the discrete ordinates and Finite Difference Method. ANN NUCL ENERGY 2020. [DOI: 10.1016/j.anucene.2019.107077] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Labarile A, Mesado C, Miró R, Verdú G. Cross-Section Generation Using TXT2NTAB Code for Uncertainty Propagation with Burnup Dependence. NUCL TECHNOL 2019. [DOI: 10.1080/00295450.2019.1631051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- A. Labarile
- Universitat Politècnica de València, Institute for Industrial, Radiophysical, and Environmental Safety (ISIRYM), Build 5I, Camí de Vera, s/n, 46022, Valencia, Spain
| | - C. Mesado
- Universitat Politècnica de València, Institute for Industrial, Radiophysical, and Environmental Safety (ISIRYM), Build 5I, Camí de Vera, s/n, 46022, Valencia, Spain
| | - R. Miró
- Universitat Politècnica de València, Institute for Industrial, Radiophysical, and Environmental Safety (ISIRYM), Build 5I, Camí de Vera, s/n, 46022, Valencia, Spain
| | - G. Verdú
- Universitat Politècnica de València, Institute for Industrial, Radiophysical, and Environmental Safety (ISIRYM), Build 5I, Camí de Vera, s/n, 46022, Valencia, Spain
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Carreño A, Vidal-Ferràndiz A, Ginestar D, Verdú G. Modal methods for the neutron diffusion equation using different spatial modes. Progress in Nuclear Energy 2019. [DOI: 10.1016/j.pnucene.2019.03.040] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gallardo S, Ródenas J, Verdú G. Unfolding X-ray spectra using a flat panel detector. Determination of the accuracy of the method with the Monte Carlo method. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2018.09.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Carreño A, Vidal-Ferràndiz A, Ginestar D, Verdú G. Block hybrid multilevel method to compute the dominant λ-modes of the neutron diffusion equation. ANN NUCL ENERGY 2018. [DOI: 10.1016/j.anucene.2018.08.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Capilla M, Talavera C, Ginestar D, Verdú G. Numerical analysis of the 2D C5G7 MOX benchmark using PL equations and a nodal collocation method. ANN NUCL ENERGY 2018. [DOI: 10.1016/j.anucene.2017.12.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Arnal J, Sancho M, García-Fayos B, Verdú G, Serrano C, Ruiz-Martínez J. Declassification of radioactive water from a pool type reactor after nuclear facility dismantling. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2017.03.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Juste B, Morató S, Miró R, Verdú G, Díez S. MCNP6 unstructured mesh application to estimate the photoneutron distribution and induced activity inside a linac bunker. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2016.03.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Juste B, Miró R, Campayo JM, Diez S, Verdú G. Linear Accelerator Photon Spectra Reconstruction Using a Mixed Experimental Monte Carlo Method. NUCL TECHNOL 2017. [DOI: 10.13182/nt09-a9281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- B. Juste
- Polytechnic University of Valencia Chemical and Nuclear Engineering Department, Camí de Vera s/n, Valencia 46022, Spain
| | - R. Miró
- Polytechnic University of Valencia Chemical and Nuclear Engineering Department, Camí de Vera s/n, Valencia 46022, Spain
| | - J. M. Campayo
- Hospital Clínic Universitari de Valencia Avda. Blasco Ibáñez, 17, Valencia 46010, Spain
| | - S. Diez
- Hospital Clínic Universitari de Valencia Avda. Blasco Ibáñez, 17, Valencia 46010, Spain
| | - G. Verdú
- Polytechnic University of Valencia Chemical and Nuclear Engineering Department, Camí de Vera s/n, Valencia 46022, Spain
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Affiliation(s)
- G. Verdú
- Universidad Politécnica de Valencia, Departamento de Ingeniería Química y Nuclear Camino de Vera, 14, 46022 Valencia, Spain
| | - R. Miró
- Universidad Politécnica de Valencia, Departamento de Ingeniería Química y Nuclear Camino de Vera, 14, 46022 Valencia, Spain
| | - A. M. Sánchez
- Universidad Politécnica de Valencia, Departamento de Ingeniería Química y Nuclear Camino de Vera, 14, 46022 Valencia, Spain
| | - O. Roselló
- Universidad Politécnica de Valencia, Departamento de Ingeniería Química y Nuclear Camino de Vera, 14, 46022 Valencia, Spain
| | - D. Ginestar
- Universidad Politécnica de Valencia, Departamento de Matemática Aplicada Camino de Vera, 14, 46022 Valencia, Spain
| | - V. Vidal
- Universidad Politécnica de Valencia, Departamento de Sistemas Informáticos y Computación Camino de Vera, 14, 46022 Valencia, Spain
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Juste B, Miró R, Verdú G, Díez S, Campayo JM. Bremsstrahlung Spectrum Reconstruction from Gradient Depth Dose Curves Obtained in a Water Phantom. NUCL TECHNOL 2017. [DOI: 10.13182/nt11-a12287] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- B. Juste
- Universitat Politècnica de València, Institute for Industrial, Radiophysical and Environmental Safety, Camí de Vera, s/n Valencia, 46022, Spain
| | - R. Miró
- Universitat Politècnica de València, Institute for Industrial, Radiophysical and Environmental Safety, Camí de Vera, s/n Valencia, 46022, Spain
| | - G. Verdú
- Universitat Politècnica de València, Institute for Industrial, Radiophysical and Environmental Safety, Camí de Vera, s/n Valencia, 46022, Spain
| | - S. Díez
- Hospital Clínic Universitari de Valencia, Avda, Blasco Ibáñez 17, 46010, Valencia, Spain
| | - J. M. Campayo
- Hospital Clínic Universitari de Valencia, Avda, Blasco Ibáñez 17, 46010, Valencia, Spain
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Abarca A, Miró R, Verdú G, Bermejo JA. Analysis of Thermal-Hydraulic Fluctuations in Trillo NPP With CTF/PARCS v. 2.7 Coupled Code. Journal of Nuclear Engineering and Radiation Science 2016. [DOI: 10.1115/1.4031660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The low-frequency noises are fluctuations in the neutron flux density, in the low-frequency range up to 4 Hz, which generate noise in the neutron instrumentation and could affect the limitation and protection system of the reactor core. Some European pressurized water reactors (PWRs) experienced the effect of low-frequency noise, opening a new research line for the verification of the neutron-kinetics/thermal-hydraulic coupled codes. A CTF/PARCS v. 2.7 simulation study to verify whether periodical fluctuations in the core inlet temperature could activate the core protection system has been done, obtaining the frequency spectrum of the power oscillation amplitudes.
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Affiliation(s)
- A. Abarca
- Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM), Universitat Politècnica de València, Camí de Vera s/n, 46021 València, Spain e-mail:
| | - R. Miró
- Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM), Universitat Politècnica de València, Camí de Vera s/n, 46021 València, Spain e-mail:
| | - G. Verdú
- Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM), Universitat Politècnica de València, Camí de Vera s/n, 46021 València, Spain e-mail:
| | - J. A. Bermejo
- Iberdrola Ingeniería y Construcción S.A.U, Av. Manoteras, 20. Edificio C, 28050 Madrid, Spain e-mail:
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Carlos S, Querol A, Gallardo S, Sanchez-Saez F, Villanueva J, Martorell S, Verdú G. Post-test analysis of the ROSA/LSTF and PKL counterpart test. Nuclear Engineering and Design 2016. [DOI: 10.1016/j.nucengdes.2015.10.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Vidal-Ferràndiz A, González-Pintor S, Ginestar D, Verdú G, Asadzadeh M, Demazière C. Use of discontinuity factors in high-order finite element methods. ANN NUCL ENERGY 2016. [DOI: 10.1016/j.anucene.2015.06.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Juste B, Miró R, Verdú G, Díez S, Campayo JM. Neutron activation processes simulation in an Elekta medical linear accelerator head. Annu Int Conf IEEE Eng Med Biol Soc 2015; 2014:3026-8. [PMID: 25570628 DOI: 10.1109/embc.2014.6944260] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Monte Carlo estimation of the giant-dipole-resonance (GRN) photoneutrons inside the Elekta Precise LINAC head (emitting a 15 MV photon beam) were performed using the MCNP6 (general-purpose Monte Carlo N-Particle code, version 6). Each component of LINAC head geometry and materials were modelled in detail using the given manufacturer information. Primary photons generate photoneutrons and its transport across the treatment head was simulated, including the (n, γ) reactions which undergo activation products. The MCNP6 was used to develop a method for quantifying the activation of accelerator components. The approach described in this paper is useful in quantifying the origin and the amount of nuclear activation.
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Abstract
(222)Rn is a naturally occurring gas created from the decay of (226)Ra. The long-term health risk of breathing radon is lung cancer. One particular place where indoor radon concentrations can exceed national guidelines is in wastewater treatment plants (WWTPs) where treatment processes may contribute to ambient airborne concentrations. The aim of this paper was to study the radon concentration decrease after the application of corrective measures in a Spanish WWTP. According to first measures, air radon concentration exceeded International Commission Radiologica1 Protection (ICRP) normative (recommends intervention between 400 and 1000 Bq m(-3)). Therefore, the WWTP improved mechanical forced ventilation to lower occupational exposure. This measure allowed to increase the administrative controls, since the limitation of workers access to the plant changed from 2 h d(-1) (considering a maximum permissible dose of 20 mSv y(-1) averaged over 5 y) to 7 h d(-1).
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Affiliation(s)
- B Juste
- ISIRYM, Instituto de Seguridad Industrial, Radiofísica y Medioambiental, Universidad Politécnica de Valencia, Camí de Vera s/n, Valencia 46022, Spain
| | - J Ortiz
- Laboratorio de Radiactividad Ambiental, Universidad Politécnica de Valencia, Camí de Vera s/n, Valencia 46022, Spain
| | - G Verdú
- ISIRYM, Instituto de Seguridad Industrial, Radiofísica y Medioambiental, Universidad Politécnica de Valencia, Camí de Vera s/n, Valencia 46022, Spain
| | - S Martorell
- Laboratorio de Radiactividad Ambiental, Universidad Politécnica de Valencia, Camí de Vera s/n, Valencia 46022, Spain
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35
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Querol A, Gallardo S, Verdú G. Simulation of a SBLOCA in a hot leg. Scaling considerations and application to a nuclear power plant. Nuclear Engineering and Design 2015. [DOI: 10.1016/j.nucengdes.2014.10.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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36
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Juste B, Miró R, Verdú G, Díez S, Campayo JM. Neutron distribution and induced activity inside a Linac treatment room. Annu Int Conf IEEE Eng Med Biol Soc 2015; 2015:6896-6899. [PMID: 26737878 DOI: 10.1109/embc.2015.7319978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Induced radioactivity and photoneutron contamination inside a radiation therapy bunker of a medical linear accelerator (Linac) is investigated in this work. The Linac studied is an Elekta Precise electron accelerator which maximum treatment photon energy is 15 MeV. This energy exceeds the photonuclear reaction threshold (around 7 MeV for high atomic number metals). The Monte Carlo code MCNP6 has been used for quantifying the neutron contamination inside the treatment room for different gantry rotation configuration. Walls activation processes have also been simulated. The approach described in this paper is useful to prevent the overexposure of patients and medical staff.
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37
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Pozuelo F, Gallardo S, Querol A, Verdú G, Ródenas J. X-ray simulation with the Monte Carlo code PENELOPE. Application to Quality Control. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2012:5777-80. [PMID: 23367242 DOI: 10.1109/embc.2012.6347307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A realistic knowledge of the energy spectrum is very important in Quality Control (QC) of X-ray tubes in order to reduce dose to patients. However, due to the implicit difficulties to measure the X-ray spectrum accurately, it is not normally obtained in routine QC. Instead, some parameters are measured and/or calculated. PENELOPE and MCNP5 codes, based on the Monte Carlo method, can be used as complementary tools to verify parameters measured in QC. These codes allow estimating Bremsstrahlung and characteristic lines from the anode taking into account specific characteristics of equipment. They have been applied to simulate an X-ray spectrum. Results are compared with theoretical IPEM 78 spectrum. A sensitivity analysis has been developed to estimate the influence on simulated spectra of important parameters used in simulation codes. With this analysis it has been obtained that the FORCE factor is the most important parameter in PENELOPE simulations. FORCE factor, which is a variance reduction method, improves the simulation but produces hard increases of computer time. The value of FORCE should be optimized so that a good agreement of simulated and theoretical spectra is reached, but with a reduction of computer time. Quality parameters such as Half Value Layer (HVL) can be obtained with the PENELOPE model developed, but FORCE takes such a high value that computer time is hardly increased. On the other hand, depth dose assessment can be achieved with acceptable results for small values of FORCE.
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Affiliation(s)
- F Pozuelo
- Ingeniería Química y Nuclear department, Universitat Politècnica de València, València, Spain.
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38
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González-Pintor S, Ginestar D, Verdú G. Modified Block Newton method for the lambda modes problem. Nuclear Engineering and Design 2013. [DOI: 10.1016/j.nucengdes.2011.06.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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39
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Juste B, Miró R, Jambrina A, Díez S, Campayo JM, Santos A, Verdú G. Comparison between transmission and scattering spectrum reconstruction methods based on EPID images. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2013:1640-1643. [PMID: 24110018 DOI: 10.1109/embc.2013.6609831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Numerous improved physics-based methods for Linac photon spectra reconstruction have been published; some of them are based on transmission data analysis and others on scattering data. In this work, the two spectrum unfolding approaches are compared in order to experimentally validate its robustness and to determine which is the optimal methodology for application on a clinical quality assurance routine. Both studied methods are based on EPID images generated when the incident photon beam impinges onto plastic blocks. The distribution of transmitted/scatter radiation produced by this object centered at the beam field size was measured. Measurements were performed using a 6 MeV photon beam produced by the linear accelerator. The same radiation distribution conditions were also simulated with Monte Carlo code for a series of monoenergetic identical geometry photon beams for both cases. Two systems of linear equations were generated to combine the polyenergetic EPID measurements with the monoenergetic simulation results. Regularization techniques were applied to solve the systems for obtaining the incident photon spectrum. We present a comparison between the well-known photon Spectral Reconstruction based on Transmission Data (Trans-based) technology and the Spectral Reconstruction based on Scattering Data (Scatt-based), which we both developed using EPID images. It is shown that Trans-based reconstruction results display much better agreement with photon spectrum theoretical predictions.
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40
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Ánchel F, Barrachina T, Miró R, Verdú G, Juanas J, Macián-Juan R. Uncertainty and sensitivity analysis in the neutronic parameters generation for BWR and PWR coupled thermal-hydraulic–neutronic simulations. Nuclear Engineering and Design 2012. [DOI: 10.1016/j.nucengdes.2011.11.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Capilla M, Talavera C, Ginestar D, Verdú G. Application of a nodal collocation approximation for the multidimensional PL equations to the 3D Takeda benchmark problems. ANN NUCL ENERGY 2012. [DOI: 10.1016/j.anucene.2011.09.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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42
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Juste B, Miró R, Morera D, Díez S, Campayo JM, Verdú G. MCNP5 Monte Carlo simulation of amorphous silicon EPID dosimetry from MLC radiation therapy treatment beams. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2012:5786-5789. [PMID: 23367244 DOI: 10.1109/embc.2012.6347309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The present work is focused on a MCNP Monte Carlo (MC) simulation of a multi-leaf collimator (MLC) radiation therapy treatment unit including its corresponding Electronic Portal Imaging Device (EPID). We have developed a methodology to perform a spatial calibration of the EPID signal to obtain dose distribution using MC simulations. This calibration is based on several images acquisition and simulation considering different thicknesses of solid water slabs, using a 6 MeV photon beam and a square field size of 20 cm x 20 cm. The resulting relationship between the EPID response and the MC simulated dose is markedly linear. This signal to dose EPID calibration was used as a dosimetric tool to perform the validation of the MLC linear accelerator MCNP model. Simulation results and measurements agreed within 2% of dose difference. The methodology described in this paper potentially offers an optimal verification of dose received by patients under complex multi-field conformal or intensity-modulated radiation therapy (IMRT).
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Affiliation(s)
- B Juste
- The Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM), Polytechnic University of Valencia, Valencia, Spain.
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44
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Barrachina T, Garcia-Fenoll M, Ánchel F, Miró R, Verdú G, Pereira C, da Silva C, Ortego A, Martínez-Murillo J. REA 3D-dynamic analysis in Almaraz NPP with RELAP5/PARCS v2.7 and SIMTAB cross-sections tables. Progress in Nuclear Energy 2011. [DOI: 10.1016/j.pnucene.2011.07.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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45
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Gallardo S, Ródenas J, Querol A, Verdú G. Application of the MTSVD unfolding method for reconstruction of primary X-ray spectra using semiconductor detectors. Progress in Nuclear Energy 2011. [DOI: 10.1016/j.pnucene.2011.06.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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46
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Miró R, Barrachina T, Abarca A, Verdú G, Pereira C, Martínez-Murillo J. Implementation of control rod movement and boron injection options by using control variables in RELAP5/PARCS V2.7 coupled code. Progress in Nuclear Energy 2011. [DOI: 10.1016/j.pnucene.2010.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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47
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Querol A, Gallardo S, Ródenas J, Verdú G. Parametric study of the X-ray primary spectra obtained with the MTSVD unfolding method. Appl Radiat Isot 2011; 69:1112-7. [PMID: 21078558 DOI: 10.1016/j.apradiso.2010.10.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 09/30/2010] [Accepted: 10/21/2010] [Indexed: 10/18/2022]
Abstract
The modified truncated singular value decomposition (MTSVD) unfolding method is applied to obtain primary spectra for X-ray tubes in radiodiagnostic. Three parameters - voltage, anode angle and filter thickness - of the tube are tested. Unfolded spectra are compared with theoretical extracted from IPEM-78 catalogue. A 2σ error criterion is applied to assess the minimum variations in tested parameters that permits distinguishing between close spectra.
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Affiliation(s)
- A Querol
- Universidad Politécnica de Valencia, Camí de Vera s/n 46022, Valencia, Spain.
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48
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Abella V, Miró R, Juste B, Verdú G. MCNP5 Electron and Photon Monte Carlo Calculations Coupled with Radiation Treatment Planning System PLUNC. NUCL TECHNOL 2011. [DOI: 10.13182/nt11-a12269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- V. Abella
- Universitat Politècnica de València, Institute for Industrial, Radiophysical and Environmental Safety, Camí de Vera, s/n. Valencia 46022, Spain
| | - R. Miró
- Universitat Politècnica de València, Institute for Industrial, Radiophysical and Environmental Safety, Camí de Vera, s/n. Valencia 46022, Spain
| | - B. Juste
- Universitat Politècnica de València, Institute for Industrial, Radiophysical and Environmental Safety, Camí de Vera, s/n. Valencia 46022, Spain
| | - G. Verdú
- Universitat Politècnica de València, Institute for Industrial, Radiophysical and Environmental Safety, Camí de Vera, s/n. Valencia 46022, Spain
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49
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Mayo P, Rodenas F, Campayo JM, Marín B, Verdú G. Quality Assurance Applied to Digital Radiographic Equipment by Developed Software for Phantom Images. NUCL TECHNOL 2011. [DOI: 10.13182/nt11-a12268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- P. Mayo
- Titania Servicios Tecnologicos, Sorolla Center, local 10, Avda. de las Cortes Valencianas, No. 58, 46015, Valencia, Spain
| | - F. Rodenas
- Universidad Politécnica de Valencia, Departamento de Matemáticas Camino de Vera s/n, 46022, Valencia, Spain
| | - J. M. Campayo
- Hospital Clínico Universitario de Valencia, Avda. Blasco Ibañez, No. 17 46017, Valencia, Spain
| | - B. Marín
- Universidad Politécnica de Valencia, Departamento de Ingeniería Química y Nuclear Camino de Vera s/n, 46022, Valencia, Spain
| | - G. Verdú
- Universidad Politécnica de Valencia, Departamento de Ingeniería Química y Nuclear Camino de Vera s/n, 46022, Valencia, Spain
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50
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Querol A, Gallardo S, Ródenas J, Verdú G. Application of the MTSVD and Tikhonov Unfolding Methods for Reconstruction of Primary X-Ray Spectra of Mammography Equipment with Silicon Detector. NUCL TECHNOL 2011. [DOI: 10.13182/nt11-a12271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A. Querol
- Universidad Politécnica de Valencia, Camino de Vera s0n 46022, Valencia, Spain
| | - S. Gallardo
- Universidad Politécnica de Valencia, Camino de Vera s0n 46022, Valencia, Spain
| | - J. Ródenas
- Universidad Politécnica de Valencia, Camino de Vera s0n 46022, Valencia, Spain
| | - G. Verdú
- Universidad Politécnica de Valencia, Camino de Vera s0n 46022, Valencia, Spain
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