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704 results on '"P. Aurea"'

1. Machine Learning Strategies for Parkinson Tremor Classification Using Wearable Sensor Data

Author

Paucar-Escalante, Jesus, da Silva, Matheus Alves, Sanches, Bruno De Lima, Soriano-Vargas, Aurea, Moriyama, Laura Silveira, and Colombini, Esther Luna

Subjects
Computer Science - Machine Learning, Electrical Engineering and Systems Science - Signal Processing
Abstract

Parkinson's disease (PD) is a neurological disorder requiring early and accurate diagnosis for effective management. Machine learning (ML) has emerged as a powerful tool to enhance PD classification and diagnostic accuracy, particularly by leveraging wearable sensor data. This survey comprehensively reviews current ML methodologies used in classifying Parkinsonian tremors, evaluating various tremor data acquisition methodologies, signal preprocessing techniques, and feature selection methods across time and frequency domains, highlighting practical approaches for tremor classification. The survey explores ML models utilized in existing studies, ranging from traditional methods such as Support Vector Machines (SVM) and Random Forests to advanced deep learning architectures like Convolutional Neural Networks (CNN) and Long Short-Term Memory networks (LSTM). We assess the efficacy of these models in classifying tremor patterns associated with PD, considering their strengths and limitations. Furthermore, we discuss challenges and discrepancies in current research and broader challenges in applying ML to PD diagnosis using wearable sensor data. We also outline future research directions to advance ML applications in PD diagnostics, providing insights for researchers and practitioners., Comment: 28 pages, 9 figures, 3 tables, Journal Artificial Intelligence In Medicine

Published
2025

2. Studying single-electron traps in newly fabricated Skipper-CCDs for the Oscura experiment using the pocket-pumping technique

Author

Garcia, Santiago Ezequiel Perez, Vergara, Brenda Aurea Cervantes, Estrada, Juan Cruz, Holland, Stephen, Maltez, Dario Pablo Rodrigues Ferreira, and Tiffenberg, Javier

Subjects
Nuclear and Plasma Physics, Physical Sciences, Mathematical Sciences, Engineering, Applied Physics, Mathematical sciences, Physical sciences
Abstract

Understanding and characterizing very low-energy ( ∼ eV) background sources is a must in rare-event searches. Oscura, an experiment aiming to probe electron recoils from sub-GeV dark matter using a 10 kg skipper-CCD detector, has recently fabricated its first two batches of sensors. In this work, we present the characterization of defects/contaminants identified in the buried-channel region of these newly fabricated skipper-CCDs. These defects/contaminants produce deferred charge from trap emission in the images next to particle tracks, which can be spatially resolved due to the sub-electron resolution achieved with these sensors. Using the trap-pumping technique, we measured the energy and cross section associated with these traps in three Oscura prototype sensors from different fabrication batches which underwent different gettering methods during fabrication. Results suggest that the type of defects/contaminants is more closely linked to the fabrication batch rather than to the gettering method used. The exposure-dependent single-electron rate (SER) of one of these sensors was measured ∼ 100 m underground, yielding ( 1.8 ± 0.3 ) × 10 − 3 e − /pix/day at 131 K. The impact of the identified traps on the measured exposure-dependent SER is evaluated via a Monte Carlo simulation. Results suggest that the exposure-dependent SER of Oscura prototype sensors would be lower in lower background environments as expected.

Published
2024

5. Regular, beating and dilogarithmic breathers in biased photorefractive crystals

Author

Betancur-Silvera, Carlos Alberto, Espinosa-Ceron, Aurea, Malomed, Boris A., and Fujioka, Jorge

Subjects
Physics - Optics, Nonlinear Sciences - Pattern Formation and Solitons, J.2
Abstract

The propagation of light beams in photovoltaic pyroelectric photorefractive crystals is modelled by a specific generalization of the nonlinear Schr\"odinger equation (GNLSE). We use the variational approximation (VA) to predict the propagation of solitary-wave inputs in the crystal, finding that the VA equations involve the dilogarithm special function. The VA predicts that solitons and breathers exist, and the Vakhitov-Kolokolov criterion predicts that the solitons are stable solutions. Direct simulations of the underlying GNLSE corroborates the existence of such stable modes. The numerical solutions produce both regular breathers and ones featuring beats (long-period modulations of fast oscillations). In the latter case, the Fourier transform of amplitude oscillations reveals a nearly discrete spectrum characterizing the beats dynamics. Numerical solutions of another type demonstrate spontaneous splitting of the input pulse in two or several secondary ones., Comment: 34 pages, 28 figures, 56 references. To be published in a special issue of journal AXIOMS on the topic "Nonlinear Schroedinger equations"

Published
2024

9. Goodbye Hartmann trial: a prospective, international, multicenter, observational study on the current use of a surgical procedure developed a century ago

Author

Perrone, Gennaro, Giuffrida, Mario, Abu-Zidan, Fikri, Kruger, Vitor F., Livrini, Marco, Petracca, Gabriele Luciano, Rossi, Giorgio, Tarasconi, Antonio, Tian, Brian W. C. A., Bonati, Elena, Mentz, Ricardo, Mazzini, Federico N., Campana, Juan P., Gasser, Elisabeth, Kafka-Ritsch, Reinhold, Felsenreich, Daniel M., Dawoud, Christopher, Riss, Stefan, Gomes, Carlos Augusto, Gomes, Felipe Couto, Gonzaga, Ricardo Alessandro Teixeira, Canton, Cassio Alfred Brattig, Pereira, Bruno Monteiro, Fraga, Gustavo P., Zem, Leticia Gonçalves, Cordeiro-Fonseca, Vinicius, de Mesquita Tauil, Renato, Atanasov, Boyko, Belev, Nikolay, Kovachev, Nikola, Meléndez, L. Juan José, Dimova, Ana, Dimov, Stefan, Zelić, Zdravko, Augustin, Goran, Bogdanić, Branko, Morić, Trpimir, Chouillard, Elie, Bajul, Melinda, De Simone, Belinda, Panis, Yves, Esposito, Francesco, Notarnicola, Margherita, Lauka, Lelde, Fabbri, Anna, Hentati, Hassen, Fnaiech, Iskander, Aurélien, Venara, Bougard, Marie, Roulet, Maxime, Demetrashvili, Zaza, Pipia, Irakli, Merabishvili, Giorgi, Bouliaris, Konstantinos, Koukoulis, Georgios, Doudakmanis, Christos, Xenaki, Sofia, Chrysos, Emmanuel, Kokkinakis, Stamatios, Vassiliu, Panteleimon, Michalopoulos, Nikolaos, Margaris, Ioannis, Kechagias, Aristotelis, Avgerinos, Konstantinos, Katunin, Jevgeni, Lostoridis, Eftychios, Nagorni, Eleni-Aikaterini, Pujante, Antonio, Mulita, Francesk, Maroulis, Ioannis, Vailas, Michail, Marinis, Athanasios, Siannis, Ioannis, Bourbouteli, Eirini, Manatakis, Dimitrios K., Tasis, Nikolaos, Acheimastos, Vasileios, Maria, Sotiropoulou, Stylianos, Kapiris, Kuzeridis, Harilaos, Korkolis, Dimitrios, Fradelos, Evangelos, Kavalieratos, George, Petropoulou, Thalia, Polydorou, Andreas, Papacostantinou, Ioannis, Triantafyllou, Tania, Kimpizi, Despina, Theodorou, Dimitrios, Toutouzas, Konstantinos, Chamzin, Alexandros, Frountzas, Maximos, Schizas, Dimitrios, Karavokyros, Ioannis, Syllaios, Athanasios, Charalabopoulos, Alexandros, Boura, Maria, Baili, Efstratia, Ioannidis, Orestis, Loutzidou, Lydia, Anestiadou, Elissavet, Tsouknidas, Ioannis, Petrakis, Georgios, Polenta, Eleni, Bains, Lovenish, Gupta, Rahul, Singh, Sudhir K., Khanduri, Archana, Bala, Miklosh, Kedar, Asaf, Pisano, Marcello, Podda, Mauro, Pisanu, Adolfo, Martines, Gennaro, Trigiante, Giuseppe, Lantone, Giuliano, Agrusa, Antonino, Di Buono, Giuseppe, Buscemi, Salvatore, Veroux, Massimiliano, Gioco, Rossella, Veroux, Gastone, Oragano, Luigi, Zonta, Sandro, Lovisetto, Federico, Feo, Carlo V., Pesce, Antonio, Fabbri, Nicolò, Lantone, Giulio, Marino, Fabio, Perrone, Fabrizio, Vincenti, Leonardo, Papagni, Vincenzo, Picciariello, Arcangelo, Rossi, Stefano, Picardi, Biagio, Del Monte, Simone Rossi, Visconti, Diego, Osella, Giulia, Petruzzelli, Luca, Pignata, Giusto, Andreuccetti, Jacopo, D’Alessio, Rossella, Buonfantino, Massimo, Guaitoli, Eleonora, Spinelli, Stefano, Sampietro, Gianluca Matteo, Corbellini, Carlo, Lorusso, Leonardo, Frontali, Alice, Pezzoli, Isabella, Bonomi, Alessandro, Chierici, Andrea, Cotsoglou, Christian, Manca, Giuseppe, Delvecchio, Antonella, Musa, Nicola, Casati, Massimiliano, Letizia, Laface, Abate, Emmanuele, Ercolani, Giorgio, D’Acapito, Fabrizio, Solaini, Leonardo, Guercioni, Gianluca, Cicconi, Simone, Sasia, Diego, Borghi, Felice, Giraudo, Giorgio, Sena, Giuseppe, Castaldo, Pasquale, Cardamone, Eugenia, Portale, Giuseppe, Zuin, Matteo, Spolverato, Ylenia, Esposito, Marialusia, Isernia, Roberta Maria, Di Salvo, Maria, Manunza, Romina, Esposito, Giuseppe, Agus, Marcello, Asti, Emanuele Luigi Giuseppe, Bernardi, Daniele Tiziano, Tonucci, Tommaso Panici, Luppi, Davide, Casadei, Massimiliano, Bonilauri, Stefano, Pezzolla, Angela, Panebianco, Annunziata, Laforgia, Rita, De Luca, Maurizio, Zese, Monica, Parini, Dario, Jovine, Elio, De Sario, Giuseppina, Lombardi, Raffaele, Aprea, Giovanni, Palomba, Giuseppe, Capuano, Marianna, Argenio, Giulio, Orio, Gianluca, Armellino, Mariano Fortunato, Troian, Marina, Guerra, Martina, Nagliati, Carlo, Biloslavo, Alan, Germani, Paola, Aizza, Giada, Monsellato, Igor, Chahrour, Ali Chaouki, Anania, Gabriele, Bombardini, Cristina, Bagolini, Francesco, Sganga, Gabriele, Fransvea, Pietro, Bianchi, Valentina, Boati, Paolo, Ferrara, Francesco, Palmieri, Francesco, Cianci, Pasquale, Gattulli, Domenico, Restini, Enrico, Cillara, Nicola, Cannavera, Alessandro, Nita, Gabriela Elisa, Sarnari, Jlenia, Roscio, Francesco, Clerici, Federico, Scandroglio, Ildo, Berti, Stefano, Cadeo, Alessandro, Filippelli, Alice, Conti, Luigi, Grassi, Carmine, Cattaneo, Gaetano Maria, Pighin, Marina, Papis, Davide, Gambino, Giovanni, Bertino, Vanessa, Schifano, Domenico, Prando, Daniela, Fogato, Luisella, Cavallo, Fabio, Ansaloni, Luca, Picheo, Roberto, Pontarolo, Nicholas, Depalma, Norma, Spampinato, Marcello, D’Ugo, Stefano, Lepre, Luca, Capponi, Michela Giulii, Campa, Rossella Domenica, Sarro, Giuliano, Dinuzzi, Vincenza Paola, Olmi, Stefano, Uccelli, Matteo, Ferrari, Davide, Inama, Marco, Moretto, Gianluigi, Fontana, Michele, Favi, Francesco, Picariello, Erika, Rampini, Alessia, Barberis, Andrea, Azzinnaro, Antonio, Oliva, Alba, Totaro, Luigi, Benzoni, Ilaria, Ranieri, Valerio, Capolupo, Gabriella Teresa, Carannante, Filippo, Caricato, Marco, Ronconi, Maurizio, Casiraghi, Silvia, Casole, Giovanni, Pantalone, Desire, Alemanno, Giovanni, Scheiterle, Maximilian, Ceresoli, Marco, Cereda, Marco, Fumagalli, Chiara, Zanzi, Federico, Bolzon, Stefano, Guerra, Enrico, Lecchi, Francesca, Cellerino, Paola, Ardito, Antonella, Scaramuzzo, Rosa, Balla, Andrea, Lepiane, Pasquale, Tartaglia, Nicola, Ambrosi, Antonio, Pavone, Giovanna, Palini, Gian Marco, Veneroni, Simone, Garulli, Gianluca, Ricci, Claudio, Torre, Beatrice, Russo, Iris Shari, Rottoli, Matteo, Tanzanu, Marta, Belvedere, Angela, Milone, Marco, Manigrasso, Michele, De Palma, Giovanni Domenico, Piccoli, Micaela, Pattacini, Gianmaria Casoni, Magnone, Stefano, Bertoli, Paolo, Pisano, Michele, Massucco, Paolo, Palisi, Marco, Luzzi, Andrea-Pierre, Fleres, Francesco, Clarizia, Guglielmo, Spolini, Alessandro, Kobe, Yoshiro, Toma, Takayuki, Shimamura, Fumihiko, Parker, Robert, Ranketi, Sinkeet, Mitei, Mercy, Svagzdys, Saulius, Pauzas, Henrikas, Zilinskas, Justas, Poskus, Tomas, Kryzauskas, Marius, Jakubauskas, Matas, Zakaria, Andee Dzulkarnaen, Zakaria, Zaidi, Wong, Michael Pak-Kai, Jusoh, Asri Che, Zakaria, Muhammad Nazreen, Cruz, Daniel Rios, Elizalde, Aurea Barbara Rodriguez, Reynaud, Alejandro Bañon, Hernandez, Edgard Efren Lozada, Monroy, Jose maria Victor Palomo, Hinojosa-Ugarte, Diego, Quiodettis, Martha, Du Bois, María Esther, Latorraca, José, Major, Piotr, Pędziwiatr, Michał, Pisarska-Adamczyk, Magdalena, Walędziak, Maciej, Kwiatkowski, Andrzej, Czyżykowski, Łukasz, da Costa, Silvia Dantas, Pereira, Bela, Ferreira, Ana Rita Oliveira, Almeida, Filipe, Rocha, Ricardo, Carneiro, Carla, Perez, Diego Pita, Carvas, João, Rocha, Catarina, Ferreira, Cátia, Marques, Rita, Fernandes, Urânia, Leao, Pedro, Goulart, André, Pereira, Rita Gonçalves, Patrocínio, Sara Daniela Direito, de Mendonça, Nuno Gonçalo Gonçalves, Manso, Maria Isabel Cerqueira, Morais, Henrique Manuel Cardoso, Cardoso, Paulo Sebastião, Calu, Valentin, Miron, Adrian, Toma, Elena Adelina, Gachabayov, Mahir, Abdullaev, Abakar, Litvin, Andrey, Nechay, Taras, Tyagunov, Alexander, Yuldashev, Anvar, Bradley, Alison, Wilson, Michael, Panyko, Arpád, Látečková, Zuzana, Lacko, Vladimír, Lesko, Dusan, Soltes, Marek, Radonak, Jozef, Turrado-Rodriguez, Victor, Termes-Serra, Roser, Morales-Sevillano, Xavier, Lapolla, Pierfrancesco, Mingoli, Andrea, Brachini, Gioia, Degiuli, Maurizio, Sofia, Silvia, Reddavid, Rossella, de Manzoni Garberini, Andrea, Buffone, Angelica, del Pozo, Eduardo Perea, Aparicio-Sánchez, Daniel, Dos Barbeito, Sandra, Estaire-Gómez, Mercedes, Vitón-Herrero, Rebeca, de los Ángeles Gil Olarte-Marquez, Mª, Gil-Martínez, José, Alconchel, Felipe, Nicolás-López, Tatiana, Rahy-Martin, Aida Cristina, Pelloni, María, Bañolas-Suarez, Raquel, Mendoza-Moreno, Fernando, Nisa, Francisca García-Moreno, Díez-Alonso, Manuel, Rodas, María Elisa Valle, Agundez, María Carmona, Andrés, María Inmaculada Pérez, Moreira, Claudia Cristina Lopes, Perez, Aintzane Lizarazu, Ponce, Iñigo Augusto, González-Castillo, Ana María, Membrilla-Fernández, Estela, Salvans, Silvia, Serradilla-Martín, Mario, Pardo, Pablo Sancho, Rivera-Alonso, Daniel, Dziakova, Jana, Huguet, Jose Mugüerza, Valle, Naila Pagès, Ruiz, Enrique Colás, Valcárcel, Cristina Rey, Moreno, Cristina Ruiz, Salazar, Yeniffer Tatiana Moreno, García, Juan Jesús Rubio, Micó, Silvia Sevila, López, Joaquín Ruiz, Farré, Silvia Pérez, Gomez, Maite Santamaria, Petit, Nuria Mestres, Titos-García, Alberto, Aranda-Narváez, Jose Manuel, Romacho-López, Laura, Sánchez-Guillén, Luis, Aranaz-Ostariz, Veronica, Bosch-Ramírez, Marina, Martínez-Pérez, Aleix, Martínez-López, Elías, Sebastián-Tomás, Juan Carlos, Jimenez-Riera, Granada, Jimenez-Vega, Javier, Cuellar, Jose Aurelio Navas, Campos-Serra, Andrea, Muñoz-Campaña, Anna, Gràcia-Roman, Raquel, Alegre, Javier Martínez, Pinto, Francisca Lima, O’Sullivan, Sara Nuñez, Antona, Francisco Blanco, Jiménez, Beatriz Muñoz, López-Sánchez, Jaime, Carmona, Zahira Gómez, Fernández, Rocio Torres, Sierra, Isabel Blesa, de León, Laura Román García, Moreno, Verónica Polaino, Iglesias, Eva, Cumplido, Paola Lora, Bravo, Altea Arango, Simó, Ignacio Rey, Domínguez, Carlota López, Caamaño, Aloia Guerreiro, Lozano, Rafael Calleja, Martínez, Manuel Durán, Torres, Álvaro Naranjo, de Quiros, Javier Tomas Morales Bernaldo, Pellino, Gianluca, Cloquell, Miriam Moratal, Moller, Elsa García, Jalal-Eldin, Sami, Abdoun, Ahmed K., Hamid, Hytham K. S., Lohsiriwat, Varut, Mongkhonsupphawan, Aitsariya, Baraket, Oussama, Ayed, Karim, Abbassi, Imed, Ali, Ali Ben, Ammar, Houssem, Kchaou, Ali, Tlili, Ahmed, Zribi, Imen, Colak, Elif, Polat, Suleyman, Koylu, Zehra Alan, Guner, Ali, Usta, Mehmet Arif, Reis, Murat Emre, Mantoglu, Baris, Gonullu, Emre, Akin, Emrah, Altintoprak, Fatih, Bayhan, Zulfu, Firat, Necattin, Isik, Arda, Memis, Ufuk, Bayrak, Mehmet, Altıntaş, Yasemin, Kara, Yasin, Bozkurt, Mehmet Abdussamet, Kocataş, Ali, Das, Koray, Seker, Ahmet, Ozer, Nazmi, Atici, Semra Demirli, Tuncer, Korhan, Kaya, Tayfun, Ozkan, Zeynep, Ilhan, Onur, Agackiran, Ibrahim, Uzunoglu, Mustafa Yener, Demirbas, Eren, Altinel, Yuksel, Meric, Serhat, Hacım, Nadir Adnan, Uymaz, Derya Salim, Omarov, Nail, Balık, Emre, Tebala, Giovanni D., Khalil, Hany, Rana, Mridul, Khan, Mansoor, Florence, Charlotte, Swaminathan, Christie, Leo, Cosimo Alex, Liasis, Lampros, Watfah, Josef, Trostchansky, Ivan, Delgado, Edward, Pontillo, Marcelo, Latifi, Rifat, Coimbra, Raul, Edwards, Sara, Lopez, Ana, Velmahos, George, Dorken, Ander, Gebran, Anthony, Palmer, Amanda, Oury, Jeffrey, Bardes, James M., Seng, Sirivan Suon, Coffua, Lauren S., Ratnasekera, Asanthi, Egodage, Tanya, Echeverria-Rosario, Karla, Armento, Isabella, Napolitano, Lena M., Sangji, Naveen F., Hemmila, Mark, Quick, Jacob A., Austin, Tyler R., Hyman, Theodore S., Curtiss, William, McClure, Amanda, Cairl, Nicholas, Biffl, Walter L., Truong, Hung P., Schaffer, Kathryn, Reames, Summer, Banchini, Filippo, Capelli, Patrizio, Coccolini, Federico, Sartelli, Massimo, Bravi, Francesca, Vallicelli, Carlo, Agnoletti, Vanni, Baiocchi, Gian Luca, and Catena, Fausto

Published
2024
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16. Pesticides in soil, groundwater and food in Latin America as part of one health

Author

Hilber, Isabel, Bahena-Juárez, Fernando, Chiaia-Hernández, Aurea C., Elgueta, Sebastián, Escobar-Medina, Arturo, Friedrich, Karen, González-Curbelo, Miguel Ángel, Grob, Yael, Martín-Fleitas, Marisleydis, Miglioranza, Karina S. B., Peña-Suárez, Brizeidi, Pérez-Consuegra, Nilda, Ramírez-Muñoz, Fernando, Sosa-Pacheco, Dayana, and Bucheli, Thomas D.

Published
2024
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17. Factors of composite $4n^2 +1$ using Fermat's factorization method

Author

Longhas, Paul Ryan, Abdul, Alsafat, and Rosal, Aurea

Subjects
Mathematics - General Mathematics, 11A07
Abstract

In this article, we factor the composite $4n^2 +1$ using Fermat's factorization method. Consequently, we characterized all proper factors of composite $4n^2 +1$ in terms of its form. Furthermore, the composite Fermat's number is considered in this study., Comment: 8 pages, article

Published
2022
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18. The Oscura Experiment

Author

Aguilar-Arevalo, Alexis, Bessia, Fabricio Alcalde, Avalos, Nicolas, Baxter, Daniel, Bertou, Xavier, Bonifazi, Carla, Botti, Ana, Cababie, Mariano, Cancelo, Gustavo, Cervantes-Vergara, Brenda Aurea, Castello-Mor, Nuria, Chavarria, Alvaro, Chavez, Claudio R., Chierchie, Fernando, De Egea, Juan Manuel, D`Olivo, Juan Carlos, Dreyer, Cyrus E., Drlica-Wagner, Alex, Essig, Rouven, Estrada, Juan, Estrada, Ezequiel, Etzion, Erez, Fernandez-Moroni, Guillermo, Fernandez-Serra, Marivi, Holland, Steve, Barreda, Agustin Lantero, Lathrop, Andrew, Lipovetzky, Jose, Loer, Ben, Villalpando, Edgar Marrufo, Molina, Jorge, Perez, Santiago, Privitera, Paolo, Rodrigues, Dario, Saldanha, Richard, Cruz, Diego Santa, Singal, Aman, Saffold, Nathan, Stefanazzi, Leandro, Sofo-Haro, Miguel, Tiffenberg, Javier, Torres, Christian, Uemura, Sho, and Vilar, Rocio

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Oscura experiment will lead the search for low-mass dark matter particles using a very large array of novel silicon Charge Coupled Devices (CCDs) with a threshold of two electrons and with a total exposure of 30 kg-yr. The R&D effort, which began in FY20, is currently entering the design phase with the goal of being ready to start construction in late 2024. Oscura will have unprecedented sensitivity to sub-GeV dark matter particles that interact with electrons, probing dark matter-electron scattering for masses down to 500 keV and dark matter being absorbed by electrons for masses down to 1 eV. The Oscura R&D effort has made some significant progress on the main technical challenges of the experiment, of which the most significant are engaging new foundries for the fabrication of the CCD sensors, developing a cold readout solution, and understanding the experimental backgrounds.

Published
2022

19. Topics in Present-Day Science Technology and Innovation: Ultrafast Relaxation Processes in Semiconductors

Author

Rodrigues, Clóves Gonçalves, Vasconcellos, Áurea Rosas, and Luzzi, Roberto

Subjects
Condensed Matter - Materials Science
Abstract

The nowadays notable development of all the modern technology, fundamental for the progress and well being of world society, imposes a great deal of stress in the realm of basic Physics, more precisely on Thermo-Mechanical Statistics. In electronics and optoelectronics we face situations involving physical-chemical systems far-removed-from equilibrium, where ultrafast (in pico- and femto-second scale) and non-linear processes are present. Here we describe in an extended overview the question of ultrafast relaxation processes in the excited plasma in semiconductors., Comment: arXiv admin note: text overlap with arXiv:1210.8108

Published
2021

20. Hot Electron Dynamics in Zincblende and Wurtzite GaN

Author

Rodrigues, Clóves Gonçalves, Freire, Valder N., Vasconcellos, Áurea R., and Luzzi, Roberto

Subjects
Condensed Matter - Materials Science
Abstract

A theoretical investigation of the excess energy dissipation of highly excited photoinjected electrons in both wurtzite and zincblende GaN is presented. The calculations are performed by solving numerically coupled quantum transport equations for the carriers and the acoustic, transversal and longitudinal optical phonon in order to derive the evolution of their nonequilibrium temperatures, dubbed quasi-temperatures. It is shown that the electron energy dissipation is always faster in the wurtzite structure than in zincblende, both occurring in a subpicosecond time scale (< 0.2 ps)., Comment: arXiv admin note: substantial text overlap with arXiv:2110.00854

Published
2021

21. Mobility in N-Doped Wurtzite III-Nitrides

Author

Rodrigues, Clóves Gonçalves, Freire, Valder N., Vasconcellos, Áurea R., and Luzzi, Roberto

Subjects
Condensed Matter - Materials Science
Abstract

A study of the mobility of n-doped wurtzite III-Nitrides is reported. We have determined the nonequilibrium thermodynamic state of the III-Nitrides systems, driven far away from equilibrium by a strong electric field, in the steady state, which follows after a very fast transient. The dependence of the mobility (which depends on the nonequilibrium thermodynamic state of the sample) on the electric field strength is derived, which decreases with the strength of electric field. We analyzed the contributions to the mobility arising out of the different channels of electron scattering, namely, the polar optic, deformation, piezoelectric, interactions with the phonons, and with impurities. The case of n-InN, n-GaN, and n-AlN have been analyzed: as expected the main contribution comes from the polar-optic interactions in these strongly polar semiconductors. The other interactions are in decreasing order, the deformation acoustic, the piezoelectric, and the one due to impurities., Comment: arXiv admin note: substantial text overlap with arXiv:2110.00847

Published
2021

22. The Diversity of the English Higher Education System: A Multilevel Quantitative Analysis

Author

Barbato, Giovanni, Grané, Aurea, Salini, Silvia, and Turri, Matteo

Abstract

Although the diversity of higher education (HE) systems is a widely debated topic in literature, this has been rarely examined considering multiple levels of analysis. This article adopts both a multilevel and longitudinal perspective to study which dimensions of horizontal diversity diversified the English HE system most. Diversity, and how this has changed over time, is investigated at the level of the HE system (macro-level) at the level of homogeneous groups of universities, i.e. mission groups (meso-level), and at the level of individual universities (micro-level). The comprehensive multivariate quantitative analysis performed across the three levels of analysis shows the polarization between research and teaching orientation emerges as the dimension on which the HE system and universities horizontally diversify most together with the internationalization of the student body. The analysis furtherly suggests that mission groups well represent the diversity of the English HE system and universities' membership in one of these groups emerged as an element that restrains distinctive institutional positioning patterns of universities. Younger universities and those not affiliated to any mission groups are indeed those that present changes in their strategic positioning paths over time, and thus affect more the diversity of the HE system. However, while the horizontal diversity of the HE system has slightly increased over time, this paper also suggests that competition has concurrently contributed to reinforcing the hierarchical stratification of English universities.

Published
2023
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23. Fostering Cultural Responsiveness in K-8 Education: A Case Study of an Urban Public School

Author

Aurea Evelyn Jaca

Abstract

This case study investigates the intricate landscape of K-8 education in Connecticut, particularly focusing on Culturally Responsive Teaching (CRT). Drawing inspiration from theories of cultural intelligence and collaborative learning, the research sought to understand the experiences, perceptions, and practices of K-8 educators concerning CRT, especially in the context of Public Act No. 19-100. This case study investigates the intricate landscape of K-8 education in Connecticut, particularly focusing on Culturally Responsive Teaching (CRT). Drawing inspiration from theories of cultural intelligence and collaborative learning, the research sought to understand the experiences, perceptions, and practices of K-8 educators concerning CRT, especially in the context of Public Act No. 19-100. Four distinct themes emerged, each highlighting different facets of the CRT landscape. From the pressing need for comprehensive training modules to the challenges of sourcing culturally diverse teaching materials, the study sheds light on the practicalities educators navigate daily. It also underscored the importance of community engagement and the need for continuous professional development in ensuring the consistent application of CRT techniques. The case study culminates with actionable recommendations for enhancing professional development, fostering community relationships, and embedding the ethos of CRT within educational systems. The findings and recommendations presented aim to pave the way for an inclusive, effective, and vibrant educational landscape in Connecticut, ensuring every student feels seen, heard, and valued. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]

Published
2023

27. Second- and third-order optical susceptibilities in bidimensional semiconductors near excitons states

Author

Lafeta, Lucas, Corradi, Aurea, Zhang, Tianyi, Kahn, Ethan, Bilgin, Ismail, Carvalho, Bruno R., Kar, Swastik, Terrones, Mauricio, and Malard, Leandro M.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Semiconducting Transition Metal Dichalcogenides (TMDs) have significant nonlinear optical effects. In this work we have used second-harmonic generation (SHG) and the four-wave mixing (FWM) spectroscopy in resonance with the excitons in MoS2, MoSe2, and WS2 monolayers to characterize the nonlinear optical properties of these materials. We show that trions and excitons are responsible for enhancing the nonlinear optical response, and determine the exciton and trion energies by comparing with the photoluminescence spectra. Moreover, we extract the second and third order optical sheet susceptibility near exciton energies and compare with values found in the literature. We also demonstrate the ability to generate different nonlinear effects in a wide spectral range in the visible region for monolayer MoS2, opening the possibility of using two-dimensional materials for nonlinear optoelectronic and photonic applications., Comment: 8 pages, 4 figures

Published
2021
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30. Censura infantojuvenil en la literatura y educación europea

Author

Fernández, Ramón Tena, Vázquez, José Soto, Valente, Thiago Alves, Balça, Ângela, Pardo, Ignacio Ballester, Brady, Jennifer, Medina, Camilo Esteban Goelkel, González, Laura Hernández, Huerta, Máximo, de Lima Grecco, Gabriela, Machado, Ana Maria, de Marcos Alfaro, María, Rus, Ana Martínez, Michelli, Regina, Murray, Johari, López, María Teresa Orozco, Martha, Alice Áurea Penteado, dos Santos Feres, Beatriz, Sanz-Hernando, Clara, Fernández, Ramón Tena, Vázquez, José Soto, Valente, Thiago Alves, Balça, Ângela, Pardo, Ignacio Ballester, Brady, Jennifer, Medina, Camilo Esteban Goelkel, González, Laura Hernández, Huerta, Máximo, de Lima Grecco, Gabriela, Machado, Ana Maria, de Marcos Alfaro, María, Rus, Ana Martínez, Michelli, Regina, Murray, Johari, López, María Teresa Orozco, Martha, Alice Áurea Penteado, dos Santos Feres, Beatriz, and Sanz-Hernando, Clara

Published
2024

31. Deep learning for lithological classification of carbonate rock micro-CT images

Author

Anjos, Carlos E. M. dos, Avila, Manuel R. V., Vasconcelos, Adna G. P., Neta, Aurea M. P., Medeiros, Lizianne C., Evsukoff, Alexandre G., and Surmas, Rodrigo

Subjects
Computer Science - Computer Vision and Pattern Recognition, Computer Science - Machine Learning, Electrical Engineering and Systems Science - Image and Video Processing
Abstract

In addition to the ongoing development, pre-salt carbonate reservoir characterization remains a challenge, primarily due to inherent geological particularities. These challenges stimulate the use of well-established technologies, such as artificial intelligence algorithms, for image classification tasks. Therefore, this work intends to present an application of deep learning techniques to identify patterns in Brazilian pre-salt carbonate rock microtomographic images, thus making possible lithological classification. Four convolutional neural network models were proposed. The first model includes three convolutional layers followed by fully connected layers and is used as a base model for the following proposals. In the next two models, we replace the max pooling layer with a spatial pyramid pooling and a global average pooling layer. The last model uses a combination of spatial pyramid pooling followed by global average pooling in place of the last pooling layer. All models are compared using original images, when possible, as well as resized images. The dataset consists of 6,000 images from three different classes. The model performances were evaluated by each image individually, as well as by the most frequently predicted class for each sample. According to accuracy, Model 2 trained on resized images achieved the best results, reaching an average of 75.54% for the first evaluation approach and an average of 81.33% for the second. We developed a workflow to automate and accelerate the lithology classification of Brazilian pre-salt carbonate samples by categorizing microtomographic images using deep learning algorithms in a non-destructive way., Comment: 13 pages, 8 figures

Published
2020

39. On existence and uniqueness of solution for a hydrodynamic problem related to water artificial circulation in a lake

Author

Fernández, Francisco J., Álvarez-Vázquez, Lino J., and Martínez, Aurea

Subjects
Mathematics - Analysis of PDEs
Abstract

In this work we introduce a well-posed mathematical model for the processes involved in the artificial circulation of water, in order to avoid eutrophication phenomena, for instance, in a lake. This novel and general formulation is based on the modified Navier-Stokes equations following the Smagorinsky model of turbulence, and presenting a suitable nonhomogeneous Dirichlet boundary condition. For the analytical study of the problem, we prove several theoretical results related to existence, uniqueness and smoothness for the solution of this recirculation model.

Published
2019

40. An optimization problem related to water artificial recirculation for controlling eutrophication

Author

Fernández, Francisco J., Martínez, Aurea, and Alzarez-Vázquez, Lino J.

Subjects
Mathematics - Optimization and Control
Abstract

In this work, the artificial recirculation of water is presented and analyzed, from the perspective of the optimal control of partial differential equations, as a tool to prevent eutrophication effects in large waterbodies. A novel formulation of the environmental problem, based on the coupling of nonlinear models for hydrodynamics, water temperature and concentrations of the different species involved in the eutrophication processes, is introduced. After a complete and rigorous analysis of the existence of optimal solutions, a full numerical algorithm for their computation is proposed. Finally, some numerical results for a realistic scenario are shown, in order to prove the efficiency of our approach.

Published
2019

41. Mathematical analysis and numerical resolution of a heat transfer problem arising in water recirculation

Author

Fernández, Francisco J., Alvarez-Vázquez, Lino J., and Martínez, Aurea

Subjects
Mathematics - Analysis of PDEs
Abstract

This work is devoted to the analysis and resolution of a well-posed mathematical model for several processes involved in the artificial circulation of water in a large waterbody. This novel formulation couples the convective heat transfer equation with the modified Navier-Stokes system following a Smagorinsky turbulence model, completed with a suitable set of mixed, nonhomogeneous boundary conditions of diffusive, convective and radiative type. We prove several theoretical results related to existence of solution, and propose a full algorithm for its computation, illustrated with some realistic numerical examples.

Published
2019

45. Statistical Thermodynamics of the Fr\'ohlich-Bose-Einstein Condensation of Magnons out of Equilibrium

Author

Vannucchi, Fabio Stucchi, Vasconcellos, Áurea Rosas, and Luzzi, Roberto

Subjects
Condensed Matter - Statistical Mechanics
Abstract

A non-equilibrium statistical-thermodynamic approach to the study of a Fr\"ohlich-Bose-Einstein condensation of magnons under radio-frequency radiation pumping is presented. Such a system displays a complex behavior consisting in steady-state conditions to the emergence of a synergetic dissipative structure resembling the Bose-Einstein condensation of systems in equilibium. A kind of "two fluid model" arises: the "normal" non-equilibrium structure and Fr\"ohlich condensate or "non-equilibrium" one, which is shown to be an attractor to the system. We analyze some aspects of the irreversible thermodynamics of this dissipative complex system, namely, its informational entropy, expressions for the fluctuations in non-equilibrium conditions, the associated Maxwell relations and the formulation of a generalized $\mathscr{H}$-theorem. We also study the informational entropy production of the system, an order parameter is introduced and Glansdorff-Prigogine criteria for evolution and (in)stability are verified., Comment: arXiv admin note: text overlap with arXiv:1302.1765

Published
2018
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48. The burden of injury in Central, Eastern, and Western European sub-region: a systematic analysis from the Global Burden of Disease 2019 Study

Author

Haagsma, Juanita A., Charalampous, Periklis, Ariani, Filippo, Gallay, Anne, Moesgaard Iburg, Kim, Nena, Evangelia, Ngwa, Che Henry, Rommel, Alexander, Zelviene, Ausra, Abegaz, Kedir Hussein, Al Hamad, Hanadi, Albano, Luciana, Liliana Andrei, Catalina, Andrei, Tudorel, Antonazzo, Ippazio Cosimo, Aremu, Olatunde, Arumugam, Ashokan, Atreya, Alok, Aujayeb, Avinash, Ayuso-Mateos, Jose Luis, Engelbert Bain, Luchuo, Banach, Maciej, Winfried Bärnighausen, Till, Barone-Adesi, Francesco, Beghi, Massimiliano, Bennett, Derrick A., Bhagavathula, Akshaya S., Carvalho, Félix, Castelpietra, Giulio, Caterina, Ledda, Chandan, Joht Singh, Couto, Rosa A. S., Cruz-Martins, Natália, Damiani, Giovanni, Dastiridou, Anna, Demetriades, Andreas K., Dias-da-Silva, Diana, Francis Fagbamigbe, Adeniyi, Fereshtehnejad, Seyed-Mohammad, Fernandes, Eduarda, Ferrara, Pietro, Fischer, Florian, Fra.Paleo, Urbano, Ghirini, Silvia, Glasbey, James C., Glavan, Ionela-Roxana, Gomes, Nelson G. M., Grivna, Michal, Harlianto, Netanja I., Haro, Josep Maria, Hasan, M. Tasdik, Hostiuc, Sorin, Iavicoli, Ivo, Ilic, Milena D., Ilic, Irena M., Jakovljevic, Mihajlo, Jonas, Jost B., Jerzy Jozwiak, Jacek, Jürisson, Mikk, Kauppila, Joonas H., Kayode, Gbenga A., Khan, Moien A. B., Kisa, Adnan, Kisa, Sezer, Koyanagi, Ai, Kumar, Manasi, Kurmi, Om P., La-Vecchia, Carlo, Lamnisos, Demetris, Lasrado, Savita, Lauriola, Paolo, Linn, Shai, Loureiro, Joana A., Lunevicius, Raimundas, Madureira-Carvalho, Aurea, Mechili, Enkeleint A., Majeed, Azeem, Menezes, Ritesh G., Mentis, Alexios-Fotios A., Meretoja, Atte, Mestrovic, Tomislav, Miazgowski, Tomasz, Miazgowski, Bartosz, Mirica, Andreea, Molokhia, Mariam, Mohammed, Shafiu, Monasta, Lorenzo, Mulita, Francesk, David Naimzada, Mukhammad, Negoi, Ionut, Neupane, Subas, Oancea, Bogdan, Orru, Hans, Otoiu, Adrian, Otstavnov, Nikita, Otstavnov, Stanislav S., Padron-Monedero, Alicia, Panda-Jonas, Songhomitra, Pardhan, Shahina, Patel, Jay, Pedersini, Paolo, Pinheiro, Marina, Rakovac, Ivo, Rao, Chythra R., Rawaf, Salman, Rawaf, David Laith, Rodrigues, Violet, Ronfani, Luca, Sagoe, Dominic, Sanmarchi, Francesco, Santric-Milicevic, Milena M., Sathian, Brijesh, Sheikh, Aziz, Shiri, Rahman, Shivalli, Siddharudha, Dora Sigfusdottir, Inga, Sigurvinsdottir, Rannveig, Yurievich Skryabin, Valentin, Aleksandrovna Skryabina, Anna, Smarandache, Catalin-Gabriel, Socea, Bogdan, Sousa, Raúl A. R. C., Steiropoulos, Paschalis, Tabarés-Seisdedos, Rafael, Roberto Tovani-Palone, Marcos, Tozija, Fimka, Van de Velde, Sarah, Juhani Vasankari, Tommi, Veroux, Massimiliano, Violante, Francesco S., Vlassov, Vasiliy, Wang, Yanzhong, Yadollahpour, Ali, Yaya, Sanni, Sergeevich Zastrozhin, Mikhail, Zastrozhina, Anasthasia, Polinder, Suzanne, and Majdan, Marek

Published
2022
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