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A. Herrero
Institut de Matemàtica Multidisciplinar, Universitat Politècnica de València (UPV), 46022 València, Spain

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Journal article
Published: 25 May 2020 in Sensors
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A full chain simulation of the acoustic hadrontherapy monitoring for brain tumours is presented in this work. For the study, a proton beam of 100 MeV is considered. In the first stage, Geant4 is used to simulate the energy deposition and to study the behaviour of the Bragg peak. The energy deposition in the medium produces local heating that can be considered instantaneous with respect to the hydrodynamic time scale producing a sound pressure wave. The resulting thermoacoustic signal has been subsequently obtained by solving the thermoacoustic equation. The acoustic propagation has been simulated by FEM methods in the brain and the skull, where a set of piezoelectric sensors are placed. Last, the final received signals in the sensors have been processed in order to reconstruct the position of the thermal source and, thus, to determine the feasibility and accuracy of acoustic beam monitoring in hadrontherapy.

ACS Style

Jorge Otero; Ivan Felis; Alicia Herrero; José Antonio Diaz Merchan; Miguel Ardid. Bragg Peak Localization with Piezoelectric Sensors for Proton Therapy Treatment. Sensors 2020, 20, 2987 .

AMA Style

Jorge Otero, Ivan Felis, Alicia Herrero, José Antonio Diaz Merchan, Miguel Ardid. Bragg Peak Localization with Piezoelectric Sensors for Proton Therapy Treatment. Sensors. 2020; 20 (10):2987.

Chicago/Turabian Style

Jorge Otero; Ivan Felis; Alicia Herrero; José Antonio Diaz Merchan; Miguel Ardid. 2020. "Bragg Peak Localization with Piezoelectric Sensors for Proton Therapy Treatment." Sensors 20, no. 10: 2987.

Journal article
Published: 01 February 2020 in Applied Mathematics and Computation
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ACS Style

A. Herrero; N. Thome. Sharp partial order and linear autonomous systems. Applied Mathematics and Computation 2020, 366, 1 .

AMA Style

A. Herrero, N. Thome. Sharp partial order and linear autonomous systems. Applied Mathematics and Computation. 2020; 366 ():1.

Chicago/Turabian Style

A. Herrero; N. Thome. 2020. "Sharp partial order and linear autonomous systems." Applied Mathematics and Computation 366, no. : 1.

Proceedings
Published: 14 November 2019 in Proceedings
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A full chain simulation of the acoustic hadron therapy monitoring for brain tumors is presented in this work. For the study, a proton beam of 100 MeV was considered. In the first stage, Geant4 was used to simulate the energy deposition and to study the behavior of the Bragg peak. The energy deposition in the medium produced local heating that can be considered instantaneous with respect to the hydrodynamic time scale producing a sound pressure wave. The resulting thermoacoustic signal was subsequently obtained by solving the thermoacoustic equation. The acoustic propagation was simulated by the Finite Element Method (FEM) in the brain and the skull, where a set of piezoelectric sensors were placed. Lastly, the final received signals in the sensors were processed in order to reconstruct the position of the thermal source and, thus, to determine the feasibility and accuracy of acoustic beam monitoring in hadron therapy.

ACS Style

Jorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero; José A. Merchán. Acoustic Bragg Peak Localization in Proton Therapy Treatment: Simulation Studies. Proceedings 2019, 42, 71 .

AMA Style

Jorge Otero, Ivan Felis, Miguel Ardid, Alicia Herrero, José A. Merchán. Acoustic Bragg Peak Localization in Proton Therapy Treatment: Simulation Studies. Proceedings. 2019; 42 (1):71.

Chicago/Turabian Style

Jorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero; José A. Merchán. 2019. "Acoustic Bragg Peak Localization in Proton Therapy Treatment: Simulation Studies." Proceedings 42, no. 1: 71.

Journal article
Published: 26 April 2019 in Sensors
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Hadrontherapy makes it possible to deliver high doses of energy to cancerous tumors by using the large energy deposition in the Bragg-peak. However, uncertainties in the patient positioning and/or in the anatomical parameters can cause distortions in the calculation of the dose distribution. In order to maximize the effectiveness of heavy particle treatments, an accurate monitoring system of the deposited dose depending on the energy, beam time, and spot size is necessary. The localized deposition of this energy leads to the generation of a thermoacoustic pulse that can be detected using acoustic technologies. This article presents different experimental and simulation studies of the acoustic localization of thermoacoustic pulses captured with a set of sensors around the sample. In addition, numerical simulations have been done where thermo-acoustic pulses are emitted for the specific case of a proton beam of 100 MeV.

ACS Style

Jorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero. Acoustic Localization of Bragg Peak Proton Beams for Hadrontherapy Monitoring. Sensors 2019, 19, 1971 .

AMA Style

Jorge Otero, Ivan Felis, Miguel Ardid, Alicia Herrero. Acoustic Localization of Bragg Peak Proton Beams for Hadrontherapy Monitoring. Sensors. 2019; 19 (9):1971.

Chicago/Turabian Style

Jorge Otero; Ivan Felis; Miguel Ardid; Alicia Herrero. 2019. "Acoustic Localization of Bragg Peak Proton Beams for Hadrontherapy Monitoring." Sensors 19, no. 9: 1971.

Proceedings
Published: 14 November 2018 in Proceedings
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Hadrontherapy makes it possible to deliver high doses of energy to cancerous tumors by using the large energy deposition in the Bragg-peak. However, uncertainties in the patient positioning and or in the anatomical parameters can cause distortions in the calculation of the dose distribution. In order to maximize the effectiveness of heavy particle treatments, an accurate monitoring system of the deposited dose depending on the energy, the beam time, and the spot size is necessary. The localized deposition of this energy leads to the generation of a thermoacoustic pulse that can be detected using acoustic technologies. This article presents different experimental and simulation studies of the acoustic localization of thermoacoustic pulses by generating similar signals that have been captured with a set of sensors around the samples. In addition, numerical simulations have been done where thermoacoustic pulses are emitted for the specific case of a proton beam of 100 MeV.

ACS Style

Jorge Otero; Miguel Ardid; Ivan Felis; Alicia Herrero. Acoustic Location of Bragg Peak for Hadrontherapy Monitoring. Proceedings 2018, 4, 6 .

AMA Style

Jorge Otero, Miguel Ardid, Ivan Felis, Alicia Herrero. Acoustic Location of Bragg Peak for Hadrontherapy Monitoring. Proceedings. 2018; 4 (1):6.

Chicago/Turabian Style

Jorge Otero; Miguel Ardid; Ivan Felis; Alicia Herrero. 2018. "Acoustic Location of Bragg Peak for Hadrontherapy Monitoring." Proceedings 4, no. 1: 6.

Journal article
Published: 01 April 2017 in Journal of Cosmology and Astroparticle Physics
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The 79-string IceCube search for dark matter in the Sun public data is used to test Secluded Dark Matter models. No significant excess over background is observed and constraints on the parameters of the models are derived. Moreover, the search is also used to constrain the dark photon model in the region of the parameter space with dark photon masses between 0.22 and ~ 1 GeV and a kinetic mixing parameter ε ~ 10−9, which remains unconstrained. These are the first constraints of dark photons from neutrino telescopes. It is expected that neutrino telescopes will be efficient tools to test dark photons by means of different searches in the Sun, Earth and Galactic Center, which could complement constraints from direct detection, accelerators, astrophysics and indirect detection with other messengers, such as gamma rays or antiparticles.

ACS Style

M. Ardid; I. Felis; A. Herrero; Juan Antonio Martinez-Mora. Constraining Secluded Dark Matter models with the public data from the 79-string IceCube search for dark matter in the Sun. Journal of Cosmology and Astroparticle Physics 2017, 2017, 010 -010.

AMA Style

M. Ardid, I. Felis, A. Herrero, Juan Antonio Martinez-Mora. Constraining Secluded Dark Matter models with the public data from the 79-string IceCube search for dark matter in the Sun. Journal of Cosmology and Astroparticle Physics. 2017; 2017 (4):010-010.

Chicago/Turabian Style

M. Ardid; I. Felis; A. Herrero; Juan Antonio Martinez-Mora. 2017. "Constraining Secluded Dark Matter models with the public data from the 79-string IceCube search for dark matter in the Sun." Journal of Cosmology and Astroparticle Physics 2017, no. 4: 010-010.

Journal article
Published: 15 May 2015 in Linear and Multilinear Algebra
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ACS Style

Alexander Guterman; Alicia Herrero; Néstor Thome; Alicia Herrero Debón. New matrix partial order based on spectrally orthogonal matrix decomposition. Linear and Multilinear Algebra 2015, 64, 362 -374.

AMA Style

Alexander Guterman, Alicia Herrero, Néstor Thome, Alicia Herrero Debón. New matrix partial order based on spectrally orthogonal matrix decomposition. Linear and Multilinear Algebra. 2015; 64 (3):362-374.

Chicago/Turabian Style

Alexander Guterman; Alicia Herrero; Néstor Thome; Alicia Herrero Debón. 2015. "New matrix partial order based on spectrally orthogonal matrix decomposition." Linear and Multilinear Algebra 64, no. 3: 362-374.

Articles
Published: 29 April 2014 in Linear and Multilinear Algebra
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This paper deals with singular systems of index . Our main goal is to find a state-feedback such that the closed-loop system satisfies the regularity condition and it is nonnegative and stable. In order to do that, the core-nilpotent decomposition of a square matrix is applied to the singular matrix of the system. Moreover, if the Drazin projector of this matrix is nonnegative, then the previous decomposition allows us to write the core-part of the matrix in a specific block form. In addition, an algorithm to study this kind of systems via a state-feedback is designed.

ACS Style

A. Herrero; F.J. Ramírez; Nestor Thome; Alicia Herrero Debón. An algorithm to study the nonnegativity, regularity and stability via state-feedbacks of singular systems of arbitrary index. Linear and Multilinear Algebra 2014, 63, 882 -892.

AMA Style

A. Herrero, F.J. Ramírez, Nestor Thome, Alicia Herrero Debón. An algorithm to study the nonnegativity, regularity and stability via state-feedbacks of singular systems of arbitrary index. Linear and Multilinear Algebra. 2014; 63 (5):882-892.

Chicago/Turabian Style

A. Herrero; F.J. Ramírez; Nestor Thome; Alicia Herrero Debón. 2014. "An algorithm to study the nonnegativity, regularity and stability via state-feedbacks of singular systems of arbitrary index." Linear and Multilinear Algebra 63, no. 5: 882-892.

Journal article
Published: 27 March 2013 in Applied Mathematics Letters
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In this work we study conditions for guaranteeing the nonnegativity of a discrete-time singular control system. A first approach can be found in the literature for general systems, using the whole coefficient matrices. Also, the particular case of matrices of index 1 has been treated by using a block decomposition and the group-projector of the matrix that gives the singularity to the system. In order to complete this study, an analysis of the nonnegativity of a singular control system for matrices having arbitrary index is done by means of the core–nilpotent decomposition. This technique allows us to reduce the size of the original matrices, improving the results where the whole coefficients are involved.

ACS Style

Alicia Herrero; Néstor Thome. Nonnegative singular control systems using the Drazin projector. Applied Mathematics Letters 2013, 26, 799 -803.

AMA Style

Alicia Herrero, Néstor Thome. Nonnegative singular control systems using the Drazin projector. Applied Mathematics Letters. 2013; 26 (7):799-803.

Chicago/Turabian Style

Alicia Herrero; Néstor Thome. 2013. "Nonnegative singular control systems using the Drazin projector." Applied Mathematics Letters 26, no. 7: 799-803.

Journal article
Published: 01 February 2013 in Linear Algebra and its Applications
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ACS Style

Alicia Herrero; Francisco J. Ramírez; Néstor Thome; Alicia Herrero Debón. Relationships between different sets involving group and Drazin projectors and nonnegativity. Linear Algebra and its Applications 2013, 438, 1688 -1699.

AMA Style

Alicia Herrero, Francisco J. Ramírez, Néstor Thome, Alicia Herrero Debón. Relationships between different sets involving group and Drazin projectors and nonnegativity. Linear Algebra and its Applications. 2013; 438 (4):1688-1699.

Chicago/Turabian Style

Alicia Herrero; Francisco J. Ramírez; Néstor Thome; Alicia Herrero Debón. 2013. "Relationships between different sets involving group and Drazin projectors and nonnegativity." Linear Algebra and its Applications 438, no. 4: 1688-1699.

Journal article
Published: 01 July 2011 in Applied Mathematics Letters
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ACS Style

A. Herrero; Nestor Thome; Alicia Herrero Debón. Using the GSVD and the lifting technique to find {P,k+1} reflexive and anti-reflexive solutions of AXB=C. Applied Mathematics Letters 2011, 24, 1130 -1141.

AMA Style

A. Herrero, Nestor Thome, Alicia Herrero Debón. Using the GSVD and the lifting technique to find {P,k+1} reflexive and anti-reflexive solutions of AXB=C. Applied Mathematics Letters. 2011; 24 (7):1130-1141.

Chicago/Turabian Style

A. Herrero; Nestor Thome; Alicia Herrero Debón. 2011. "Using the GSVD and the lifting technique to find {P,k+1} reflexive and anti-reflexive solutions of AXB=C." Applied Mathematics Letters 24, no. 7: 1130-1141.

Journal article
Published: 19 July 2010 in Classical and Quantum Gravity
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A Painlev'e-Gullstrand synchronization is a slicing of the space-time by a family of flat spacelike 3-surfaces. For spherically symmetric space-times, we show that a Painlev'e-Gullstrand synchronization only exists in the region where $(dr)^2 leq 1$, $r$ being the curvature radius of the isometry group orbits ($2$-spheres). This condition says that the Misner-Sharp gravitational energy of these 2-spheres is not negative and has an intrinsic meaning in terms of the norm of the mean extrinsic curvature vector. It also provides an algebraic inequality involving the Weyl curvature scalar and the Ricci eigenvalues. We prove that the energy and momentum densities associated with the Weinberg complex of a Painlev'e-Gullstrand slice vanish in these curvature coordinates, and we give a new interpretation of these slices by using semi-metric Newtonian connections. It is also outlined that, by solving the vacuum Einstein's equations in a coordinate system adapted to a Painlev'e-Gullstrand synchronization, the Schwarzschild solution is directly obtained in a whole coordinate domain that includes the horizon and both its interior and exterior regions.

ACS Style

Alicia Herrero; Juan Antonio Morales-Lladosa; Alicia Herrero Debón. Painlevé–Gullstrand synchronizations in spherical symmetry. Classical and Quantum Gravity 2010, 27, 1 .

AMA Style

Alicia Herrero, Juan Antonio Morales-Lladosa, Alicia Herrero Debón. Painlevé–Gullstrand synchronizations in spherical symmetry. Classical and Quantum Gravity. 2010; 27 (17):1.

Chicago/Turabian Style

Alicia Herrero; Juan Antonio Morales-Lladosa; Alicia Herrero Debón. 2010. "Painlevé–Gullstrand synchronizations in spherical symmetry." Classical and Quantum Gravity 27, no. 17: 1.

Conference paper
Published: 01 May 2010 in Journal of Physics: Conference Series
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ACS Style

Alicia Herrero; Juan Antonio Morales-Lladosa; Alicia Herrero Debón. Flat synchronizations in spherically symmetric space-times. Journal of Physics: Conference Series 2010, 229, 1 .

AMA Style

Alicia Herrero, Juan Antonio Morales-Lladosa, Alicia Herrero Debón. Flat synchronizations in spherically symmetric space-times. Journal of Physics: Conference Series. 2010; 229 ():1.

Chicago/Turabian Style

Alicia Herrero; Juan Antonio Morales-Lladosa; Alicia Herrero Debón. 2010. "Flat synchronizations in spherically symmetric space-times." Journal of Physics: Conference Series 229, no. : 1.

Journal article
Published: 01 February 2010 in Linear Algebra and its Applications
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ACS Style

A. Herrero; A. Ramı´rez; Nestor Thome; Alicia Herrero Debón; A. Rami´rez. Nonnegativity, stability, and regularization of discrete-time descriptor systems. Linear Algebra and its Applications 2010, 432, 837 -846.

AMA Style

A. Herrero, A. Ramı´rez, Nestor Thome, Alicia Herrero Debón, A. Rami´rez. Nonnegativity, stability, and regularization of discrete-time descriptor systems. Linear Algebra and its Applications. 2010; 432 (4):837-846.

Chicago/Turabian Style

A. Herrero; A. Ramı´rez; Nestor Thome; Alicia Herrero Debón; A. Rami´rez. 2010. "Nonnegativity, stability, and regularization of discrete-time descriptor systems." Linear Algebra and its Applications 432, no. 4: 837-846.

Journal article
Published: 01 September 2009 in Mathematical and Computer Modelling
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ACS Style

Carmen Coll; Alicia Herrero; Elena Sanchez; Néstor Thome; Alicia Herrero Debón. A dynamic model for a study of diabetes. Mathematical and Computer Modelling 2009, 50, 713 -716.

AMA Style

Carmen Coll, Alicia Herrero, Elena Sanchez, Néstor Thome, Alicia Herrero Debón. A dynamic model for a study of diabetes. Mathematical and Computer Modelling. 2009; 50 (5):713-716.

Chicago/Turabian Style

Carmen Coll; Alicia Herrero; Elena Sanchez; Néstor Thome; Alicia Herrero Debón. 2009. "A dynamic model for a study of diabetes." Mathematical and Computer Modelling 50, no. 5: 713-716.

Book chapter
Published: 01 January 2009 in Lecture Notes in Control and Information Sciences
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In [Jain, Tynan, Linear Algebra and its Applications 379, 381–394, 2004], the authors shown that a nonnegative square matrix A satisfies that AA # ≥ O, being A # the group inverse of A, if and only if A is permutationally similar to a matrix with a special structure. In this paper, a similar structure for this kind of matrices, slightly simplified, is presented, where the restriction of the nonnegativity of the matrix A is omitted. In addition, this result to characterize the {k}-group involutory matrices is applied.

ACS Style

Alicia Herrero; Francisco J. Ramírez; Néstor Thome; Alicia Herrero Debón. Characterization of Matrices with Nonnegative Group-Projector. Lecture Notes in Control and Information Sciences 2009, 315 -320.

AMA Style

Alicia Herrero, Francisco J. Ramírez, Néstor Thome, Alicia Herrero Debón. Characterization of Matrices with Nonnegative Group-Projector. Lecture Notes in Control and Information Sciences. 2009; ():315-320.

Chicago/Turabian Style

Alicia Herrero; Francisco J. Ramírez; Néstor Thome; Alicia Herrero Debón. 2009. "Characterization of Matrices with Nonnegative Group-Projector." Lecture Notes in Control and Information Sciences , no. : 315-320.

Journal article
Published: 01 January 2006 in Discrete & Continuous Dynamical Systems - B
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ACS Style

B. Cantó; C. Coll; A. Herrero; E. Sánchez; N. Thome. Pole-assignment of discrete time-delay systems with symmetries. Discrete & Continuous Dynamical Systems - B 2006, 6, 641 -649.

AMA Style

B. Cantó, C. Coll, A. Herrero, E. Sánchez, N. Thome. Pole-assignment of discrete time-delay systems with symmetries. Discrete & Continuous Dynamical Systems - B. 2006; 6 (3):641-649.

Chicago/Turabian Style

B. Cantó; C. Coll; A. Herrero; E. Sánchez; N. Thome. 2006. "Pole-assignment of discrete time-delay systems with symmetries." Discrete & Continuous Dynamical Systems - B 6, no. 3: 641-649.

Journal article
Published: 01 November 2005 in Journal of the Franklin Institute
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ACS Style

Carmen Coll; Alicia Herrero; Elena Sanchez; Néstor Thome; Alicia Herrero Debón. Output feedback stabilization for symmetric control systems. Journal of the Franklin Institute 2005, 342, 814 -823.

AMA Style

Carmen Coll, Alicia Herrero, Elena Sanchez, Néstor Thome, Alicia Herrero Debón. Output feedback stabilization for symmetric control systems. Journal of the Franklin Institute. 2005; 342 (7):814-823.

Chicago/Turabian Style

Carmen Coll; Alicia Herrero; Elena Sanchez; Néstor Thome; Alicia Herrero Debón. 2005. "Output feedback stabilization for symmetric control systems." Journal of the Franklin Institute 342, no. 7: 814-823.

Journal article
Published: 06 July 2005 in General Relativity and Gravitation
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We present the analytical solution to the linear evolution equation of a one component Friedmann perturbation using an equation of state of the form p = (1/3)μσ2(t), where μ is the mass density and σ(t) is the root mean square (rms) velocity in the matter dominated epoch. It is assumed that this rms velocity depends only on the time coordinate and decreases as 1/a, a being the expansion factor of the Friedmann background. The evolution equations are written for scales below the horizon using the longitudinal gauge. The general solution, in the coordinate space, of the evolution equation for the scalar mode is obtained. In the case of spherical symmetry, this solution is expressed in terms of unidimensional integrals of the initial conditions: the initial values of the Newtonian potential and its first time derivative. This perfect fluid solution is a good approximation to the evolution of warm dark matter perturbations obtained by solving the Vlasov’s equation for collisionless particles.

ACS Style

Alicia Herrero; Miguel Portilla; Alicia Herrero Debón. Analytical perfect fluid perturbation for the matter dominated epoch. General Relativity and Gravitation 2005, 37, 1205 -1219.

AMA Style

Alicia Herrero, Miguel Portilla, Alicia Herrero Debón. Analytical perfect fluid perturbation for the matter dominated epoch. General Relativity and Gravitation. 2005; 37 (7):1205-1219.

Chicago/Turabian Style

Alicia Herrero; Miguel Portilla; Alicia Herrero Debón. 2005. "Analytical perfect fluid perturbation for the matter dominated epoch." General Relativity and Gravitation 37, no. 7: 1205-1219.

Journal article
Published: 01 September 2004 in General Relativity and Gravitation
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Alicia Herrero; Juan Antonio Morales; Alicia Herrero Debón. Schwarzschild Interior in Conformally Flat Form. General Relativity and Gravitation 2004, 36, 2063 -2073.

AMA Style

Alicia Herrero, Juan Antonio Morales, Alicia Herrero Debón. Schwarzschild Interior in Conformally Flat Form. General Relativity and Gravitation. 2004; 36 (9):2063-2073.

Chicago/Turabian Style

Alicia Herrero; Juan Antonio Morales; Alicia Herrero Debón. 2004. "Schwarzschild Interior in Conformally Flat Form." General Relativity and Gravitation 36, no. 9: 2063-2073.