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Listar por autor "Aliaga Varea, Ramón José"

Mostrando ítems 1-20 de 25

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AMIC: An Expandable Front-End for Gamma-Ray Detectors With Light Distribution Analysis Capabilities

Herrero Bosch, Vicente; Lerche ., Christoph Werner; Spaggiari, Michele; Aliaga, Ramón J.; Ferrando Jódar, Néstor; Colom Palero, Ricardo José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2011)

[EN] A novel CMOS integrated front-end architecture is presented throughout this paper. It is designed to be used with detectors based on continuous scintillation crystals plus position sensitive photomultiplier. Its ...
AMIC: an expandable integrated analog front-end for light distribution moments analysis

Spaggiari, Michele; Herrero Bosch, Vicente; Lerche, Christoph Werner; Aliaga Varea, Ramón José; Monzó Ferrer, José María; Gadea Gironés, Rafael (IOP Publishing: Hybrid Open Access, 2011-01)

In this article we introduce AMIC (Analog Moments Integrated Circuit), a novel analog Application Specific Integrated Circuit (ASIC) front-end for Positron Emission Tomography (PET) applications. Its working principle is ...
Compact reduction in Lipschitz-free spaces

Aliaga, Ramón J.; Nous, Camille; Petitjean, Colin; Prochazka, Antonin (Institute of Mathematics, Polish Academy of Sciences, 2021)

[EN] We prove a general principle satisfied by weakly precompact sets of Lip-schitz-free spaces. By this principle, certain infinite-dimensional phenomena in Lipschitzfree spaces over general metric spaces may be reduced ...
Conceptual design of the early implementation of the NEutron Detector Array (NEDA) with AGATA

Huyuk, T.; Di Nitto, Antonio; Jaworski, Grzegorz; Gadea, Andres; Valiente-Dobón, Jose Javier; Nyberg, Johan; Palacz, Marcin; Soderstrom, Par-Anders; Aliaga-Varea, Ramon Jose; de Angelis, Giacomo; Atac, Ayse; Collado, Javier; Domingo-Pardo, Cesar; Egea, Francisco Javier; Erduran, Nizamettin; Gadea Gironés, Rafael; Herrero-Bosch, Vicente (Springer-Verlag, 2016-03-18)

[EN] The NEutron Detector Array (NEDA) project aims at the construction of a new high-efficiency compact neutron detector array to be coupled with large gamma-ray arrays such as AGATA. The application of NEDA ranges from ...
Conceptual design of the TRACE detector readout using a compact, dead time-less analog memory ASIC

Aliaga Varea, Ramón José; Herrero Bosch, Vicente; Capra, S.; Pullia, A.; Dueñas, J. A.; Grassi, L.; Triossi, A.; Domingo Pardo, C.; Gadea Gironés, Rafael; González, V.; Hüyük, T.; Sanchís, E.; Gadea, A.; Mengoni, D. (Elsevier, 2015-11-11)

[EN] The new TRacking Array for light Charged particle Ejectiles (TRACE) detector system requires monitorization and sampling of all pulses in a large number of channels with very strict space and power consumption ...
Development of a data acquisition architecture with distributed synchronization for a Positron Emission Tomography system with integrated front-end

Aliaga Varea, Ramón José (Universitat Politècnica de València, 2016-05-02)

[EN] Positron Emission Tomography (PET) is a non-invasive nuclear medical imaging modality that makes it possible to observe the distribution of metabolic substances within a patient's body after marking them with radioactive ...
Digital pulse-shape analysis with a TRACE early silicon prototype

Mengoni, D.; Dueñas, J. A.; Assie, M.; Boiano, C.; John, P. R.; Aliaga, Ramón J.; Beaumel, D.; Capra, S.; Gadea, A.; Gonzales, V.; Gottardo, A.; Grassi, L.; Herrero Bosch, Vicente; Houdy, T.; Martel, I. (Elsevier, 2014-11-11)

[EN] A highly segmented silicon-pad detector prototype has been tested to explore the performance of the digital pulse shape analysis in the discrimination of the particles reaching the silicon detector. For the first time ...
Digital Signal Processing Techniques to Improve Time Resolution in Positron Emission Tomography

Monzó Ferrer, José María; Esteve Bosch, Raul; Lerche, Christoph Werner; Ferrando Jódar, Néstor; Toledo Alarcón, José Francisco; Aliaga Varea, Ramón José; Herrero Bosch, Vicente; Mora Mas, Francisco José (Institute of Electrical and Electronics Engineers (IEEE), 2011-08)

Coincidence time resolution is one of the most important issues in PET detectors. Improving this resolution is required to increase the noise equivalent count rate (NECR) that reduces the noise in the reconstructed images. ...
Embeddings of Lipschitz-free spaces into l(1)

Aliaga, Ramón J.; Petitjean, Colin; Prochazka, Antonin (Elsevier, 2021-03-15)

[EN] We show that, for a separable and complete metric space $M$, the Lipschitz-free space $\mathcal{F}(M)$ embeds linearly and almost-isometrically into $\ell_1$ if and only if $M$ is a subset of an $\mathbb{R}$-tree with ...
Evaluation of a Modular PET System Architecture with Synchronization over Data Links

Aliaga Varea, Ramón José; Herrero Bosch, Vicente; Monzó Ferrer, José María; Ros García, Ana; Gadea Gironés, Rafael; Colom Palero, Ricardo José (Institute of Electrical and Electronics Engineers (IEEE), 2014-02)

A DAQ architecture for a PET system is presented that focuses on modularity, scalability and reusability. The system defines two basic building blocks: data acquisitors and concentra- tors, which can be replicated in order ...
Evaluation of a timing integrated circuit architecture for continuous crystal and SiPM based PET systems

Monzó Ferrer, José María; Ros García, Ana; Herrero Bosch, Vicente; Perino Vicentini, Ivan Virgilio; Aliaga Varea, Ramón José; Gadea Gironés, Rafael; Colom Palero, Ricardo José (IOP Publishing: Hybrid Open Access, 2013-03)

[EN] Improving timing resolution in positron emission tomography (PET), thus having fine time information of the detected pulses, is important to increase the reconstructed images signal to noise ratio (SNR) [1]. In the ...
Evolutionary optimization of neural networks with heterogeneous computation: study and implementation

Fe, Jorge Deolindo; Aliaga Varea, Ramón José; Gadea Gironés, Rafael (Springer Netherlands, 2015-08)

In the optimization of artificial neural networks (ANNs) via evolutionary algorithms and the implementation of the necessary training for the objective function, there is often a trade-off between efficiency and flexibility. ...
Extreme points in Lipschitz-free spaces over compact metric spaces

Aliaga, Ramón J. (Springer-Verlag, 2022-02)

[EN] We prove that all extreme points of the unit ball of a Lipschitz-free space over a compact metric space have finite support. Combined with previous results, this completely characterizes extreme points and implies ...
Geometry and structure of Lipschitz-free spaces and their biduals

Aliaga Varea, Ramón José (Universitat Politècnica de València, 2021-01-17)

[ES] Los espacios libres Lipschitz F(M) son linearizaciones canónicas de espacios métricos M cualesquiera. Más concretamente, F(M) es el único espacio de Banach que contiene una copia isométrica de M que es linearmente ...
Implementación de la sincronización de módulos de adquisición de datos en PETALO empleando enlaces de datos

Rodríguez Ponce, Jorge (Universitat Politècnica de València, 2021-10-11)

[ES] El objetivo del trabajo consiste en la implementación de un sistema de sincronización de módulos de adquisición de datos empleando un método que permite alcanzar errores inferiores a 50 picosegundos. El sistema emplea ...
Monte Carlo characterization of PETALO, a full-body liquid xenon-based PET detector

Renner, J.; Romo-Luque, C.; Aliaga, Ramón J.; Álvarez-Puerta, Vicente; Ballester Merelo, Francisco José; Benlloch-Rodríguez, J.M.; Carrión, J.V.; Cubero, D.; Díaz, J.; Esteve Bosch, Raul; Gadea Gironés, Rafael; Generowicz, J.; Gillam, J.; López-Gómez, J.L.; Martínez, A.; Rodriguez-Samaniego, Javier; Toledo Alarcón, José Francisco; Torres Curado, Ruben; Herrero Bosch, Vicente; J. Rodríguez-Ponce (IOP Publishing, 2022-05)

[EN] New detector approaches in Positron Emission Tomography imaging will play an important role in reducing costs, lowering administered radiation doses, and improving overall performance. PETALO employs liquid xenon as ...
Normal functionals on Lipschitz spaces are weak* continuous

Aliaga, Ramón J.; Pernecká, Eva (Cambridge University Press, 2022-11)

[EN] Let Lip0(M) be the space of Lipschitz functions on a complete metric space M that vanish at a base point. We prove that every normal functional in Lip0(M)¿ is weak* continuous; that is, in order to verify weak* ...
On the preserved extremal structure of Lipschitz-free spaces

Aliaga, Ramón J.; Guirao Sánchez, Antonio José (Institute of Mathematics, Polish Academy of Sciences, 2019)

[EN] We characterize preserved extreme points of the unit ball of Lipschitz-free spaces F(X) in terms of simple geometric conditions on the underlying metric space (X,d). Namely, the preserved extreme points are the ...
PET System Synchronization and Timing Resolution Using High-Speed Data Links

Aliaga Varea, Ramón José; Monzó Ferrer, José María; Spaggiari, Michele; Ferrando Jódar, Néstor; Gadea Gironés, Rafael; Colom Palero, Ricardo José (Institute of Electrical and Electronics Engineers (IEEE), 2011-08)

Current PET systems with fully digital trigger rely on early digitization of detector signals and the use of digital processors, usually FPGAs, for recognition of valid gamma events on single detectors. Timestamps are ...
Points of differentiability of the norm in Lipschitz-free spaces

Aliaga, Ramón J.; Rueda Zoca, Abraham (Elsevier, 2020-09-15)

[EN] We consider convex series of molecules in Lipschitz-free spaces, i.e. elements of the form such that . We characterise these elements in terms of geometric conditions on the points , of the underlying metric space, ...