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1,714 results on '"Pérez, Oscar"'

2. Searching for WIMPs with TREX-DM: achievements and challenges

Author

Castel, Juan F., Cebrián, Susana, Dafni, Theopisti, Díez-Ibáñez, David, Ezquerro, Álvaro, Galán, Javier, García, Juan Antonio, Irastorza, Igor G., Jiménez, María, Luzón, Gloria, Margalejo, Cristina, de Mira, Ángel, Mirallas, Hector, Obis, Luis, de Solórzano, Alfonso Ortiz, Pérez, Oscar, Ruz, Jaime, and Vogel, Julia

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Astrophysics of Galaxies
Abstract

The TREX-DM detector, a low background chamber with microbulk Micromegas readout, was commissioned in the underground laboratory of Canfranc (LSC) in 2018. Since then, data taking campaigns have been carried out with Argon and Neon mixtures, at different pressures from 1 to 4 bar. By achieving a low energy threshold of 1 keV$_{ee}$ and a background level of 80 counts keV$^{-1}$ Kg$^{-1}$ day$^{-1}$ in the region from 1 to 7 keV$_{ee}$, the experiment demonstrates its potential to search for low-mass WIMPs. Two of the most important challenges currently faced are the reduction of both, background level and energy threshold. With respect to the energy threshold, recently a new readout plane is being developed, based on the combination of Micromegas and GEM technologies, aiming to have a pre-amplification stage that would permit very low energy thresholds, close to the single-electron ionization energy. With respect to the background reduction, apart from studies to identify and minimize contamination population, a high sensitivity alpha detector is being developed in order to allow a proper material selection for the TREX-DM detector components. Both challenges, together with the optimization of the gas mixture used as target for the WIMP detection, will take TREX-DM to explore regions of WIMP's mass below 1 GeV c$^{-2}$., Comment: LIDINE 2023: LIght Detection In Noble Elements

Published
2023

26. AlphaCAMM, a Micromegas-based camera for high-sensitivity screening of alpha surface contamination

Author

Altenmüller, Konrad, Castel, Juan F., Cebrián, Susana, Dafni, Theopisti, Díez-Ibáñez, David, Galán, Javier, Galindo, Javier, García, Juan Antonio, Irastorza, Igor G., Luzón, Gloria, Margalejo, Cristina, Mirallas, Hector, Obis, Luis, de Solórzano, Alfonso Ortiz, and Pérez, Oscar

Subjects
Physics - Instrumentation and Detectors
Abstract

Surface contamination of $^{222}$Rn progeny from the $^{238}$U natural decay chain is one of the most difficult background contributions to measure in rare event searches experiments. In this work we propose AlphaCAMM, a gaseous chamber read with a segmented Micromegas, for the direct measurement of $^{210}$Pb surface contamination of flat samples. The detection concept exploits the readout capabilities of the Micromegas detectors for the reconstruction of $^{210}$Po alpha tracks to increase the signal-to-background ratio. We report here on the design and realization of a first 26$\times$26 cm$^2$ non-radiopure prototype, with which the detection concept is demonstrated by the use of a new algorithm for the reconstruction of alpha tracks. AlphaCAMM aims for minimum detectable $^{210}$Pb activities of $100$ nBq cm$^{-2}$ and sensitivity upper limits about $60$ nBq cm$^{-2}$ at 95\% of C.L., which requires an intrinsic background level of $5\times10^{-8}$ alphas cm$^{-2}$ s$^{-1}$. We discuss here the prospects to reach these sensitivity goals with a radiopure AlphaCAMM prototype currently under construction., Comment: Prepared for submission to JINST

Published
2022
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29. Safety, efficacy, and reliability evaluation ofa novel small-diameter defibrillation lead: Global LEADR pivotal trial results

Author

Sanders, Prashanthan, Pathak, Rajeev, Denman, Russell Allen, Mihalcz, Attila, Philippon, Francois, Tsang, Bernice, Sumner, Glenn, Chen, Minglong, Han, Xiuebin, Liu, Xingbin, Philbert, Berit Thornvig, Defaye, Pascal, Anselme, Frederic, Stellbrink, Christoph, Chan, Ngai-Yin, Tse, Hung-Fat, De Filippo, Paolo, Ando, Kenji, Kusano, Kengo, Shoda, Morio, Khelae, Surinder Kaur, Lopes do Carmo, Pedro Miguel, Milasinovic, Goran, Boey, Elaine, Anguera Camos, Ignasi, Cano Pérez, Oscar, Whinnett, Zachary, Baranowski, Bryan, Friedman, Meir, Dinerman, Jay, Schaller, Robert, Bozorgnia, Babak, Zakaib, John, Chinitz, Jason, West, Michael, Ramza, Brian, Canby, Robert, Takata, Theodore, Shah, Maully, Winner, Marshall, Wilson, David, Mason, Pamela, Richardson, Travis, Kalahasty, Gautham, Sholevar, Darius, Smith, Timothy, Crossley, George H., III, Hansky, Bert, Shah, Maully J., Richardson, Travis D., Philippon, François, Zakaib, John S., Sholevar, Darius P., Pathak, Rajeev K., Milašinović, Goran, Chinitz, Jason S., West, Michael B., Ramza, Brian M., Han, Xuebin, Carta, Roberto, Geelen, Tessa, Himes, Adam K., Platner, Megan L., Thompson, Amy E., and Mason, Pamela K.

Published
2024
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31. REST-for-Physics, a ROOT-based framework for event oriented data analysis and combined Monte Carlo response

Author

Altenmüller, Konrad, Cebrián, Susana, Dafni, Theopisti, Díez-Ibáñez, David, Galán, Javier, Galindo, Javier, García, Juan Antonio, Irastorza, Igor G., Luzón, Gloria, Margalejo, Cristina, Mirallas, Hector, Obis, Luis, Pérez, Oscar, Han, Ke, Ni, Kaixiang, Bedfer, Yann, Biasuzzi, Barbara, Ferrer-Ribas, Esther, Neyret, Damien, Papaevangelou, Thomas, Cogollos, Cristian, and Picatoste, Eduardo

Subjects
Physics - Computational Physics, Physics - Data Analysis, Statistics and Probability, Physics - Instrumentation and Detectors
Abstract

The REST-for-Physics (Rare Event Searches Toolkit for Physics) framework is a ROOT-based solution providing the means to process and analyze experimental or Monte Carlo event data. Special care has been taken on the traceability of the code and the validation of the results produced within the framework, together with the connectivity between code and data stored registered through specific version metadata members. The framework development was originally motivated to cover the needs at Rare Event Searches experiments (experiments looking for phenomena having extremely low occurrence probability like dark matter or neutrino interactions or rare nuclear decays), and its components naturally implement tools to address the challenges in these kinds of experiments; the integration of a detector physics response, the implementation of signal processing routines, or topological algorithms for physical event identification are some examples. Despite this specialization, the framework was conceived thinking in scalability, and other event-oriented applications could benefit from the data processing routines and/or metadata description implemented in REST, being the generic framework tools completely decoupled from dedicated libraries. REST-for-Physics is a consolidated piece of software already serving the needs of different physics experiments - using gaseous Time Projection Chambers (TPCs) as detection technology - for background data analysis and detector characterization, as well as generic detector R\&D. Even though REST has been exploited mainly with gaseous TPCs, the code could be easily applied or adapted to other detection technologies. We present in this work an overview of REST-for-Physics, providing a broad perspective to the infrastructure and organization of the project as a whole. The framework and its different components will be described in the text., Comment: 27 pages, 14 figures, prepared for submission to Computer Physics Communications

Published
2021
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32. Impact of an antimicrobial stewardship program indicator on the appropriateness of the empiric antibiotic treatment of urinary source Escherichia coli bacteraemia

Author

Blanco, Naiara Villalba, Vidal, Rafel Pérez, Fernández, Francisco José Vargas-Machuca, de Gracia García Ramírez, Mª, Castro, Ivan Javier, Serra, Natàlia Juan, Satorra, Rosa Maria Morera, Martorell, Sara Oduber, Huerta, Eduardo Sáez, Carrascosa, Montserrat, Soriano, Ludivina Ibañez, Smithson, Alex, Miserachs, Nuria, Blancas, David, Alonso-Tarrés, Carles, Ayuso, Elisabet Farré, González, Maria Priegue, de Ciriza Villacampa, Carmen Pérez, Fernández, María Dolores García, Martins, Marlene Àlvarez, del Río Pérez, Oscar, Riera, Ester Sanfeliu, Bertomeu, Manel Panisello, Flores, Angels García, González, Laura Linares, Pujol, Ester Comellas i, Matias, Guillem Vila, Adell, Claudia Miralles, Marcual, Jaume Llaberia, Sibat, Anna Martinez, Flotats, Elisenda, Roldan, Francina Riu, Martinez, Lorena Gaviria, de Gamarra Martínez, Edurne Fernández, Solchaga, Virginia Pomar, Luque, M. Fernanda Solano, Barque, M. Pilar Barrufet, Nicolas, Elisabeth Mauri, Fidalgo, Arantzazu Mera, Bertran, Nuria Torrellas, Gomila-Grange, Aina, Blasi, Oriol Gasch, Badia, Ester Dorca, Santamaria, Marta Andrés, Pérez-Moreno, Mar Olga, Pallares, Naya Bellaubi, González, Lidia Martín, Fernández, Magda Muelas, Padilla, Eduardo, Zorrilla, Silvia Gomez, Enguidanos, Maria Rosa Laplace, Jofre, Clara Sala, Arango, Mauricio Valencia, Pascua, Pilar Marcos, Chippiraz, Elisabet Lerma, Sureda, Teresa Falgueras, González, Melisa Barrantes, Saballs, Mireia, Taha, Mohamed Sufian Al-dirra, Guitart, Silvia Sancliment, Larrainzar-Coghen, Thais, Toboso, Sebastián Hernández, Rodriguez, Irene Sánchez, Fraile, Maria José, Torras, Sara Garcia, Guitard-Quer, Alba, Castellana-Perelló, Dolors, Sáenz, Alfredo Jover, Ramírez-Hidalgo, María, Pardo, Graciano García, Garriga, Imma Grau, Palau, Damaris Berbel, Moral, Alícia, Vilamala, Anna, Montal, Camil·la Valls, Navarro, Maria, Valls, Mariona Xercavins, Anaya, Gisela Cuadrado, Ochoa, Ivett Suárez, Matellanes, Julen Montoya, Trevisanello, Lucia, Segarra, Glòria Garcia, Prieto, Natacha Recio, Azcona, Ana Felisa Lopez, Iftimie, Simona Mihaella, Jaime, Laura Cabrera, Margall, Nuri Quer, Laporte, Júlia, González, Carlota Gudiol, Sanmartí, Montserrat, Diaz-Brito, Vicens, Belda, Alejandro Sanjuan, Sanz, Marta Milián, Giménez-Pérez, Montserrat, Hernández, Sergi, Padullés, Ariadna, Boix-Palop, Lucía, Grau, Santiago, Badia, Josep M., Ferrer, Ricard, Calbo, Esther, Limón, Enric, Pujol, Miquel, and Horcajada, Juan P.

Published
2024
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42. CROW: Code Diversification for WebAssembly

Author

Arteaga, Javier Cabrera, Malivitsis, Orestis, Pérez, Oscar Vera, Baudry, Benoit, and Monperrus, Martin

Subjects
Computer Science - Software Engineering, Computer Science - Cryptography and Security, Computer Science - Programming Languages
Abstract

The adoption of WebAssembly has rapidly increased in the last few years as it provides a fast and safe model for program execution. However, WebAssembly is not exempt from vulnerabilities that could be exploited by side channels attacks. This class of vulnerabilities that can be addressed by code diversification. In this paper, we present the first fully automated workflow for the diversification of WebAssembly binaries. We present CROW, an open-source tool implementing this workflow. We evaluate CROW's capabilities on 303 C programs and study its use on a real-life security-sensitive program: libsodium, a cryptographic library. Overall, CROWis able to generate diverse variants for 239 out of 303,(79%) small programs. Furthermore, our experiments show that our approach and tool is able to successfully diversify off-the-shelf cryptographic software (libsodium).

Published
2020
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43. Changes in the levels of free sialic acid during ex vivo lung perfusion do not correlate with pulmonary function. Experimental model

Author

Hernández-Jiménez, Claudia, Martínez-Cortés, Javier, Olmos-Zuñiga, J. Raúl, Jasso-Victoria, Rogelio, López-Pérez, María Teresa, Díaz-Martínez, Néstor Emmanuel, Alonso-Gómez, Marcelino, Guzmán-Cedillo, Axel Edmundo, Baltazares-Lipp, Matilde, Gaxiola-Gaxiola, Miguel, Méndez-Bernal, Adriana, Polo-Jeréz, Adrián, Vázquez-Minero, Juan Carlos, Hernández-Pérez, Oscar, and Fernández-Solís, Christopher O.

Published
2023
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44. Data Analysis and Generation in the ENVELLINT Longitudinal Study to Determine Loss of Functionality in Elderly People

Author

Nelson, John, Ollé, Jordi, Parra, Xavier, Pérez-López, Carlos, Macho-Pérez, Oscar, Arroyo-Huidobro, Marta, Català, Andreu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Rojas, Ignacio, editor, Joya, Gonzalo, editor, and Catala, Andreu, editor

Published
2023
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45. MagPump

Author

Perez, Oscar A., Takahashi, Eishin, and Broek, Stephan, editor

Published
2023
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