5,577 results on '"Sagredo A"'
Search Results
2. Electronic structure and optical properties of halide double perovskites from a Wannier-localized optimally-tuned screened range-separated hybrid functional
- Author
-
Sagredo, Francisca, Gant, Stephen E, Ohad, Guy, Haber, Jonah B, Filip, Marina R, Kronik, Leeor, and Neaton, Jeffrey B
- Subjects
Chemical Sciences ,Physical Chemistry ,Macromolecular and materials chemistry ,Materials engineering ,Condensed matter physics - Abstract
Halide double perovskites are a chemically diverse and growing class of compound semiconductors that are promising for optoelectronic applications. However, the prediction of their fundamental gaps and optical properties with density functional theory (DFT) and ab initio many-body perturbation theory has been a significant challenge. Recently, a nonempirical Wannier-localized optimally tuned screened range-separated hybrid (WOT-SRSH) functional has been shown to accurately produce the fundamental band gaps of a wide set of semiconductors and insulators, including lead halide perovskites. Here, we apply the WOT-SRSH functional to five halide double perovskites and compare the results with those obtained from other known functionals and previous GW calculations. We also use the approach as a starting point for GW calculations and we compute the band structures and optical absorption spectrum for Cs2AgBiBr6, using both time-dependent DFT and the GW-Bethe-Salpeter equation approach. We show that the WOT-SRSH functional leads to accurate fundamental and optical band gaps, as well as optical absorption spectra, consistent with spectroscopic measurements, thereby establishing WOT-SRSH as a viable method for the accurate prediction of optoelectronic properties of halide double perovskites.
- Published
- 2024
3. Unimodularity and invariant volume forms for Hamiltonian dynamics on coisotropic Poisson homogeneous spaces
- Author
-
Gutierrez-Sagredo, Ivan, Ponte, David Iglesias, Marrero, Juan Carlos, and Padrón, Edith
- Subjects
Mathematics - Differential Geometry ,Mathematical Physics ,37C40, 37J39, 53D17, 70G45, 70H05 - Abstract
In this paper, we introduce the notion of a multiplicative unimodularity for a coisotropic Poisson homogeneous space. Then, we discuss the unimodularity and the multiplicative unimodularity for these spaces and the existence of an invariant volume form for explicit Hamiltonian systems on such spaces. Several interesting examples illustrating the theoretical results are also presented., Comment: 36 pages
- Published
- 2024
4. Primer Encuentro Internacional de artistas de la máscara. Paucartambo, Cusco, Perú
- Author
-
Martínez-Sagredo, Paula and Pino-Vergara, Christian
- Published
- 2025
- Full Text
- View/download PDF
5. Context-dependent effects of CDKN2A and other 9p21 gene losses during the evolution of esophageal cancer
- Author
-
Ganguli, Piyali, Basanta, Celia C., Acha-Sagredo, Amelia, Misetic, Hrvoje, Armero, Maria, Mendez, Akram, Zahra, Aeman, Devonshire, Ginny, Kelly, Gavin, Freeman, Adam, Green, Mary, Nye, Emma, Bichisecchi, Anita, Bonfanti, Paola, Rodriguez-Justo, Manuel, Spencer, Jo, Fitzgerald, Rebecca C., and Ciccarelli, Francesca D.
- Published
- 2025
- Full Text
- View/download PDF
6. Stereotactic ablative radiotherapy (SABR) for patients with lung tumor and severe pulmonary function impairment
- Author
-
Geng-Cahuayme, Abraham André Arturo, Peregrín-Pastor, Blanca, Ramos-Albiac, Mónica, Recalde-Vizcay, Enar, Parada-Zuluaga, Juan Sebastián, Giralt-López de Sagredo, Jordi, Maldonado-Pijoan, Xavier, and Giraldo-Marín, Alexandra
- Published
- 2024
- Full Text
- View/download PDF
7. Integrable deformations of Rikitake systems, Lie bialgebras and bi-Hamiltonian structures
- Author
-
Ballesteros, Angel, Blasco, Alfonso, and Gutierrez-Sagredo, Ivan
- Subjects
Mathematics - Dynamical Systems ,Mathematical Physics ,Nonlinear Sciences - Exactly Solvable and Integrable Systems ,37J35, 34A26, 34C14, 17B62, 17B63 - Abstract
Integrable deformations of a class of Rikitake dynamical systems are constructed by deforming their underlying Lie-Poisson Hamiltonian structures, which are considered linearizations of Poisson--Lie structures on certain (dual) Lie groups. By taking into account that there exists a one-to one correspondence between Poisson--Lie groups and Lie bialgebra structures, a number of deformed Poisson coalgebras can be obtained, which allow the construction of integrable deformations of coupled Rikitake systems. Moreover, the integrals of the motion for these coupled systems can be explicitly obtained by means of the deformed coproduct map. The same procedure can be also applied when the initial system is bi-Hamiltonian with respect to two different Lie-Poisson algebras. In this case, to preserve a bi-Hamiltonian structure under deformation, a common Lie bialgebra structure for the two Lie-Poisson structures has to be found. Coupled dynamical systems arising from this bi-Hamiltonian deformation scheme are also presented, and the use of collective `cluster variables', turns out to be enlightening in order to analyse their dynamical behaviour. As a general feature, the approach here presented provides a novel connection between Lie bialgebras and integrable dynamical systems., Comment: 19 pages, 3 figures
- Published
- 2024
8. Targeting CD44 and other pleiotropic co-receptors as a means for broad inhibition of tumor growth and metastasis
- Author
-
Mehner, Lisa-Marie, Munoz-Sagredo, Leonel, Sonnentag, Steffen Joachim, Treffert, Sven Máté, and Orian-Rousseau, Véronique
- Published
- 2024
- Full Text
- View/download PDF
9. White Paper and Roadmap for Quantum Gravity Phenomenology in the Multi-Messenger Era
- Author
-
Batista, R. Alves, Amelino-Camelia, G., Boncioli, D., Carmona, J. M., di Matteo, A., Gubitosi, G., Lobo, I., Mavromatos, N. E., Pfeifer, C., Rubiera-Garcia, D., Saridakis, E. N., Terzić, T., Vagenas, E. C., Moniz, P. Vargas, Abdalla, H., Adamo, M., Addazi, A., Anagnostopoulos, F. K., Antonelli, V., Asorey, M., Ballesteros, A., Basilakos, S., Benisty, D., Boettcher, M., Bolmont, J., Bonilla, A., Bosso, P., Bouhmadi-López, M., Burderi, L., Campoy-Ordaz, A., Caroff, S., Cerci, S., Cortes, J. L., D'Esposito, V., Das, S., de Cesare, M., Demirci, M., Di Lodovico, F., Di Salvo, T., Diego, J. M., Djordjevic, G., Domi, A., Ducobu, L., Escamilla-Rivera, C., Fabiano, G., Fernández-Silvestre, D., Franchino-Viñas, S. A., Frassino, A. M., Frattulillo, D., Gaug, M., Gergely, L. Á., Guendelman, E. I., Guetta, D., Gutierrez-Sagredo, I., He, P., Heefer, S., Jurić, T., Katori, T., Kowalski-Glikman, J., Lambiase, G., Said, J. Levi, Li, C., Li, H., Luciano, G. G., Ma, B-Q, Marciano, A., Martinez, M., Mazumdar, A., Menezes, G., Mercati, F., Minic, D., Miramonti, L., Mitsou, V. A., Mustamin, M. F., Navas, S., Olmo, G. J., Oriti, D., Övgün, A., Pantig, R. C., Parvizi, A., Pasechnik, R., Pasic, V., Petruzziello, L., Platania, A., Rasouli, S. M. M., Rastgoo, S., Relancio, J. J., Rescic, F., Reyes, M. A., Rosati, G., Sakallı, İ., Salamida, F., Sanna, A., Staicova, D., Strišković, J., Cerci, D. Sunar, Torri, M. D. C., Vigliano, A., Wagner, F., Wallet, J-C, Wojnar, A., Zarikas, V., Zhu, J., and Zornoza, J. D.
- Subjects
General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena ,High Energy Physics - Theory - Abstract
The unification of quantum mechanics and general relativity has long been elusive. Only recently have empirical predictions of various possible theories of quantum gravity been put to test, where a clear signal of quantum properties of gravity is still missing. The dawn of multi-messenger high-energy astrophysics has been tremendously beneficial, as it allows us to study particles with much higher energies and travelling much longer distances than possible in terrestrial experiments, but more progress is needed on several fronts. A thorough appraisal of current strategies and experimental frameworks, regarding quantum gravity phenomenology, is provided here. Our aim is twofold: a description of tentative multimessenger explorations, plus a focus on future detection experiments. As the outlook of the network of researchers that formed through the COST Action CA18108 ``Quantum gravity phenomenology in the multi-messenger approach (QG-MM)'', in this work we give an overview of the desiderata that future theoretical frameworks, observational facilities, and data-sharing policies should satisfy in order to advance the cause of quantum gravity phenomenology.
- Published
- 2023
- Full Text
- View/download PDF
10. Unimodularity and invariant volume forms for Hamiltonian dynamics on coisotropic Poisson homogeneous spaces
- Author
-
Gutierrez-Sagredo, I., Iglesias-Ponte, D., Marrero, J. C., and Padrón, E.
- Published
- 2025
- Full Text
- View/download PDF
11. Characterizing age-related changes in intact mitochondrial proteoforms in murine hearts using quantitative top-down proteomics
- Author
-
Ramirez-Sagredo, Andrea, Sunny, Anju Teresa, Cupp-Sutton, Kellye A., Chowdhury, Trishika, Zhao, Zhitao, Wu, Si, and Chiao, Ying Ann
- Published
- 2024
- Full Text
- View/download PDF
12. Clustering COVID-19 ARDS patients through the first days of ICU admission. An analysis of the CIBERESUCICOVID Cohort
- Author
-
Ceccato, Adrian, Forne, Carles, Bos, Lieuwe D., Camprubí-Rimblas, Marta, Areny-Balagueró, Aina, Campaña-Duel, Elena, Quero, Sara, Diaz, Emili, Roca, Oriol, De Gonzalo-Calvo, David, Fernández-Barat, Laia, Motos, Anna, Ferrer, Ricard, Riera, Jordi, Lorente, Jose A., Peñuelas, Oscar, Menendez, Rosario, Amaya-Villar, Rosario, Añón, José M., Balan-Mariño, Ana, Barberà, Carme, Barberán, José, Blandino-Ortiz, Aaron, Boado, Maria Victoria, Bustamante-Munguira, Elena, Caballero, Jesús, Carbajales, Cristina, Carbonell, Nieves, Catalán-González, Mercedes, Franco, Nieves, Galbán, Cristóbal, Gumucio-Sanguino, Víctor D., de la Torre, Maria del Carmen, Estella, Ángel, Gallego, Elena, García-Garmendia, José Luis, Garnacho-Montero, José, Gómez, José M., Huerta, Arturo, Jorge-García, Ruth Noemí, Loza-Vázquez, Ana, Marin-Corral, Judith, Martínez de la Gándara, Amalia, Martin-Delgado, María Cruz, Martínez-Varela, Ignacio, Messa, Juan Lopez, Muñiz-Albaiceta, Guillermo, Nieto, María Teresa, Novo, Mariana Andrea, Peñasco, Yhivian, Pozo-Laderas, Juan Carlos, Pérez-García, Felipe, Ricart, Pilar, Roche-Campo, Ferran, Rodríguez, Alejandro, Sagredo, Victor, Sánchez-Miralles, Angel, Sancho-Chinesta, Susana, Socias, Lorenzo, Solé-Violan, Jordi, Suarez-Sipmann, Fernando, Tamayo-Lomas, Luis, Trenado, José, Úbeda, Alejandro, Valdivia, Luis Jorge, Vidal, Pablo, Bermejo, Jesus, Gonzalez, Jesica, Barbe, Ferran, Calfee, Carolyn S., Artigas, Antonio, and Torres, Antoni
- Published
- 2024
- Full Text
- View/download PDF
13. Noncommutative spacetimes versus noncommutative spaces of geodesics
- Author
-
Herranz, Francisco J., Ballesteros, Angel, Gubitosi, Giulia, and Gutierrez-Sagredo, Ivan
- Subjects
High Energy Physics - Theory ,General Relativity and Quantum Cosmology ,Mathematical Physics - Abstract
The aim of this contribution is twofold. First, we show that when two (or more) different quantum groups share the same noncommutative spacetime, such an 'ambiguity' can be resolved by considering together their corresponding noncommutative spaces of geodesics. In any case, the latter play a mathematical/physical role by themselves and, in some cases, they can be interpreted as deformed phase spaces. Second, we explicitly show that noncommutative spacetimes can be reproduced from 'extended' noncommutative spaces of geodesics which are those enlarged by the time translation generator. These general ideas are described in detail for the $\kappa$-Poincar\'e and $\kappa$-Galilei algebras., Comment: 11 pages. Based on the contribution presented at "The XII International Symposium on Quantum Theory and Symmetries" (QTS12), July 24-28, 2023, Czech Technical University in Prague, Czech Republic. To appear in Journal of Physics: Conference Series
- Published
- 2023
- Full Text
- View/download PDF
14. Optical absorption spectra of metal oxides from time-dependent density functional theory and many-body perturbation theory based on optimally-tuned hybrid functionals
- Author
-
Ohad, Guy, Gant, Stephen E., Wing, Dahvyd, Haber, Jonah B., Camarasa-Gómez, María, Sagredo, Francisca, Filip, Marina R., Neaton, Jeffrey B., and Kronik, Leeor
- Subjects
Condensed Matter - Materials Science - Abstract
Using both time-dependent density functional theory (TDDFT) and the ``single-shot" $GW$ plus Bethe-Salpeter equation ($GW$-BSE) approach, we compute optical band gaps and optical absorption spectra from first principles for eight common binary and ternary closed-shell metal oxides (MgO, Al$_2$O$_3$, CaO, TiO$_2$, Cu$_2$O, ZnO, BaSnO$_3$, and BiVO$_4$), based on the non-empirical Wannier-localized optimally-tuned screened range-separated hybrid functional. Overall, we find excellent agreement between our TDDFT and $GW$-BSE results and experiment, with a mean absolute error less than 0.4 eV, including for Cu$_2$O and ZnO, traditionally considered to be challenging for both methods.
- Published
- 2023
- Full Text
- View/download PDF
15. Detection of transcriptome-wide microRNA–target interactions in single cells with agoTRIBE
- Author
-
Sekar, Vaishnovi, Mármol-Sánchez, Emilio, Kalogeropoulos, Panagiotis, Stanicek, Laura, Sagredo, Eduardo A., Widmark, Albin, Doukoumopoulos, Evangelos, Bonath, Franziska, Biryukova, Inna, and Friedländer, Marc R.
- Published
- 2024
- Full Text
- View/download PDF
16. Cultivable Root-Symbiotic Bacteria of a Pioneer Ericaceous Dwarf Shrub Colonizing Volcanic Deposits and Their Potential to Promote host Fitness
- Author
-
Fuentes-Quiroz, Alejandra, Herrera, Héctor, Alvarado, Roxana, Sagredo-Saez, Cristiane, Isabel-Mujica, Maria, Vohník, Martin, and Rolli, Eleonora
- Published
- 2024
- Full Text
- View/download PDF
17. Endophytic seed-associated microbial diversity and its impact on seedling growth of the Andean tree Nothofagus obliqua (Mirb.) Oerst
- Author
-
Alvarado, Roxana, Sagredo-Saez, Cristiane, Fuentes-Quiroz, Alejandra, Villanueva-Guerrero, Angela, Mujica, María Isabel, Ahumada, Rodrigo, Almonacid-Muñoz, Leonardo, Jorquera-Fontena, Emilio, de Oliveira Costa, Paulo Henrique, da Silva Valadares, Rafael Borges, and Herrera, Hector
- Published
- 2024
- Full Text
- View/download PDF
18. Reseñas de libros de análisis cultural 24
- Author
-
Teresa Basile, Omar Sagredo Mazuela, Maria Morant, Paula Pérez Rey, Raúl Molina Gil, Ximena Venturini, and Marcos Araya Pizarro
- Subjects
Análisis cultural ,Fine Arts ,Language and Literature - Published
- 2025
- Full Text
- View/download PDF
19. Narrativas de solidaridad durante el Estallido Social en Chile: Testigos comprometidos durante las protestas en las calles
- Author
-
Ximena Faúndez Abarca, Omar Luis Sagredo Mazuela, and Fuad Hatibovich Díaz
- Subjects
narrativas de solidaridad ,tercer actor ,Estallido Social ,Chile ,Fine Arts ,Language and Literature - Abstract
Este estudio examina las narrativas de solidaridad generadas tras el Estallido Social del 19 de octubre de 2019 en Chile. Se realizaron entrevistas a dieciséis personas que prestaron ayuda solidaria tras el inicio de las movilizaciones. Además, se revisaron archivos escritos, orales y fotográficos. A través del análisis de contenido, fue posible distinguir diversas expresiones, asociadas no sólo con el momento represivo en que surgen, sino con las urgencias humanas posteriores. En estas acciones, la solidaridad fue central, como principio ético y eje frente a las vulneraciones sociales desde octubre de 2019 y en el inicio de la pandemia de COVID-19. Se reconocen dos dimensiones en las narrativas de solidaridad. Por una parte, tres nociones significativas: “justicia”, “sentido ético del ejercicio profesional” y “memoria y derechos humanos”. Por otro lado, tres narrativas que proyectan el sentido de la solidaridad a partir de su expresión performática, semántica y organizacional. Finalmente, se concluye la presencia transversal en las narrativas de un tercer actor, un testigo comprometido durante las protestas en las calles, desde ollas comunes hasta la solidaridad de personas anónimas, colegios profesionales, universidades, centros de estudiantes, profesionales, intelectuales y artistas.
- Published
- 2025
- Full Text
- View/download PDF
20. Tratamiento farmacológico de la obesidad. Situación actual y nuevos tratamientos
- Author
-
Julio Sagredo Pérez and Gonzalo Allo Miguel
- Subjects
Obesity ,Pharmacological treatment ,Body weight ,Medicine (General) ,R5-920 - Abstract
Resumen: La elevada incidencia de obesidad en nuestro medio, el carácter progresivo y recidivante de esta enfermedad hace necesario conocer y utilizar todas las posibilidades de prevención y tratamiento.Cuando una persona sufre obesidad debemos ofertar un plan de tratamiento con objetivos concretos que incluirá alimentación saludable, actividad física y si fuera necesario tratamiento con fármacos o incluso quirúrgico.En la actualidad para el tratamiento farmacológico, en España, disponemos de 3 medicamentos: • Orlistat, con escasa eficacia y poco uso. • Liraglutida y semaglutida, ambos basados en las incretinas y capaces de mejorar la obesidad, la diabetes y otras afecciones relacionadas con la obesidad. La elevada potencia y seguridad de estos medicamentos ha revolucionado el tratamiento farmacológico de la obesidad.Próximamente se comercializarán nuevas moléculas que permitirán ampliar las posibilidades de tratamiento, también se revisarán en el presente artículo. Abstract: The high incidence of obesity in our environment, the progressive and recurrent nature of this disease makes it necessary to know and use all the possibilities of prevention and treatment.When a person suffers from obesity we must offer a treatment plan with specific objectives that will include healthy eating, physical activity and, if necessary, treatment with medication or even surgery.At present in Spain, there are 3 medications available: • Orlistat, with low efficacy and little use. • Liraglutide and semaglutide, both based on incretins and capable of improving obesity, diabetes and other obesity-related conditions. The high potency and safety of these drugs has revolutionized the pharmacological treatment of obesity.New molecules will soon be marketed that will expand the treatment possibilities, which will also be reviewed in this article.
- Published
- 2025
- Full Text
- View/download PDF
21. Collaborative Work and Co-teaching as 21st Century Skills for Educating from an Inclusive Perspective in Face-To-Face and Virtual Contexts
- Author
-
Sagredo-Lillo, Emilio, Salamanca-Garay, Ignacio, Sagredo-Concha, Isidora, Espinoza, Javier, Soto-Fuentes, Alejandro, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Rocha, Álvaro, editor, Ferrás, Carlos, editor, Hochstetter Diez, Jorge, editor, and Diéguez Rebolledo, Mauricio, editor
- Published
- 2024
- Full Text
- View/download PDF
22. La efectividad de la Empatía Histórica como recurso didáctico en la enseñanza de la Historia de Género
- Author
-
Catalina Soto-Benavides, Constanza Yáñez-Valencia, and Angélica Vera-Sagredo
- Subjects
historical empathy ,educational resource ,gender history ,high school students ,Theory and practice of education ,LB5-3640 ,History (General) ,D1-2009 ,Latin America. Spanish America ,F1201-3799 - Abstract
The present research aimed to analyze the effectiveness of Historical Empathy as a didactic resource in the teaching of Gender History for students in the Biobío region, Chile. The study was based on a qualitative approach with a phenomenological design and included a sample of 120 secondary school students. To meet the study's objective, the work logs created by the students in four activities were analyzed. The results indicated an understanding and active engagement in addressing gender roles by the students. However, a historical reductionism was observed in the comprehension of certain aspects of the female experience. Regarding Historical Empathy, the students were able to contextualize themselves in history, avoiding presentism, and could identify the emotions that historical figures would have felt.
- Published
- 2024
- Full Text
- View/download PDF
23. Estudio exploratorio de autopercepción docente sobre robótica y labor educativa en educación primaria: aportes a la innovación y el emprendimiento
- Author
-
Angélica Vera-Sagredo, Jaime Constenla-Núñez, and Pilar Jara-Coatt
- Subjects
emprendimiento ,educación primaria ,innovación ,profesores ,robótica educativa ,Theory and practice of education ,LB5-3640 - Abstract
La innovación emprendedora y la robótica educativa están transformando el ámbito educativo. El estudio realizado en la región del Biobío, Chile, con 252 profesores de dieciséis establecimientos, tuvo como propósito analizar la percepción de los docentes sobre la innovación, el emprendimiento y el uso de la robótica educativa, identificar las diferencias de género, los años de servicio y la capacitación de los docentes y examinar las relaciones entre estas variables y con características sociodemográficas. El estudio, con un enfoque cuantitativo, transversal, descriptivo y correlacional, utilizó un cuestionario de 43 ítems denominado "Percepción sobre Emprendimiento, Innovación y Robótica Educativa en Educación (EIRE)". Los resultados muestran que los docentes valoran la innovación pedagógica y la promoción de competencias emprendedoras desde una edad temprana, sin embargo, enfrentan desafíos en su formación. Existe debate sobre la integración de la robótica en el currículo, a pesar de reconocer su utilidad en el proceso educativo.
- Published
- 2024
- Full Text
- View/download PDF
24. A general approach to noncommutative spaces from Poisson homogeneous spaces: Applications to (A)dS and Poincar\'e
- Author
-
Ballesteros, Angel, Gutierrez-Sagredo, Ivan, and Herranz, Francisco J.
- Subjects
Mathematical Physics ,General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
In this contribution we present a general procedure that allows the construction of noncommutative spaces with quantum group invariance as the quantization of their associated coisotropic Poisson homogeneous spaces coming from a coboundary Lie bialgebra structure. The approach is illustrated by obtaining in an explicit form several noncommutative spaces from (3+1)D (A)dS and Poincar\'e coisotropic Lie bialgebras. In particular, we review the construction of the $\kappa$-Minkowski and $\kappa$-(A)dS spacetimes in terms of the cosmological constant $\Lambda$. Furthermore, we present all noncommutative Minkowski and (A)dS spacetimes that preserved a quantum Lorentz subgroup. Finally, it is also shown that the same setting can be used to construct the three possible 6D $\kappa$-Poincar\'e spaces of time-like. Some open problems are also addressed., Comment: 16 pages. Contribution to the proceedings of the 34th International Colloquium on Group Theoretical Methods in Physics, Strasbourg, France, 18-22 July, 2022
- Published
- 2022
- Full Text
- View/download PDF
25. $\kappa$-Galilean and $\kappa$-Carrollian noncommutative spaces of worldlines
- Author
-
Ballesteros, Angel, Gubitosi, Giulia, Gutierrez-Sagredo, Ivan, and Herranz, Francisco J.
- Subjects
High Energy Physics - Theory ,General Relativity and Quantum Cosmology ,Mathematical Physics - Abstract
The noncommutative spacetimes associated to the $\kappa$-Poincar\'e relativistic symmetries and their "non-relativistic" (Galilei) and "ultra-relativistic" (Carroll) limits are indistinguishable, since their coordinates satisfy the same algebra. In this work, we show that the three quantum kinematical models can be differentiated when looking at the associated spaces of time-like worldlines. Specifically, we construct the noncommutative spaces of time-like geodesics with $\kappa$-Galilei and $\kappa$-Carroll symmetries as contractions of the corresponding $\kappa$-Poincar\'e space and we show that these three spaces are defined by different algebras. In particular, the $\kappa$-Galilei space of worldlines resembles the so-called Euclidean Snyder model, while the $\kappa$-Carroll space turns out to be commutative. Furthermore, we identify the map between quantum spaces of geodesics and the corresponding noncommutative spacetimes, which requires to extend the space of geodesics by adding the noncommutative time coordinate.
- Published
- 2022
- Full Text
- View/download PDF
26. Mycorrhizas in South American Ericaceae
- Author
-
Mujica, María Isabel, Herrera, Héctor, Cisternas, Mauricio, Zuniga-Feest, Alejandra, Sagredo-Saez, Cristiane, and Selosse, Marc-André
- Published
- 2024
- Full Text
- View/download PDF
27. Discordancia entre la reserva fraccional de flujo y el índice no hiperémico con guía de presión de sensor óptico. READI EPIC-14
- Author
-
Mario Sádaba Sagredo, Asier Subinas Elorriaga, Sebastián Romaní Méndez, Daniel Valcárcel Paz, Rocío Angulo Llanos, Carlos Lara García, Alicia Quirós, Erika Muñoz García, Ángel Sánchez Recalde, Javier Robles Alonso, Fernando Lozano Ruiz-Poveda, Francisco Javier Irazusta, Alfredo Redondo, Rosa Alba Abellás Sequeiros, and Oriol Rodríguez-Leor
- Subjects
Fisiología coronaria ,Reserva fraccional de flujo ,Índice no hiperémico ,Discordancia ,Drift ,Internal medicine ,RC31-1245 - Abstract
RESUMEN Introducción y objetivos: La valoración funcional de las estenosis coronarias con guías de presión de sensor piezoeléctrico ha mostrado hasta un 20% de discordancia entre los índices hiperémico y no hiperémico. No hay datos disponibles con guía de presión de sensor óptico. El objetivo del estudio es evaluar la incidencia y los factores relacionados con la discordancia diagnóstica entre estos índices con guía de presión de sensor óptico. Como objetivos secundarios se evaluó la reproducibilidad diagnóstica en dos determinaciones consecutivas de la reserva fraccional de flujo (RFF) y la diastolic pressure ratio (dPR). También se evaluó la tasa de drift. Métodos: Estudio observacional, prospectivo, multicéntrico, en pacientes a quienes se realiza una valoración funcional con guía de presión de sensor óptico. Se hicieron dos mediciones consecutivas de dPR (umbral 0,89) y RFF (umbral 0,80) en cada lesión analizada. Se valoró la correlación diagnóstica entre dos mediciones con la misma técnica y entre ambas técnicas (dPR y RFF). Se analizaron factores clínicos y angiográficos asociados a la discordancia (RFF−/dPR+ y RFF+/dPR−) entre ambas técnicas. Resultados: Se incluyeron 428 estenosis (361 pacientes). La reproducibilidad diagnóstica fue del 95,8% para dPR, con un coeficiente de correlación entre ambas mediciones (dPR1 y dPR2) de 0,974 (p < 0,0001). Para RFF la reproducibilidad diagnóstica fue del 94,9%, con un coeficiente de correlación (RFF1 y RFF2) de 0,942 (p < 0,0001). La discordancia diagnóstica fue del 18,2% (RFF+/dPR− 8,2% y RFF−/dPR+ 10%). Entre las variables analizadas, en el análisis multivariado, la hipertensión arterial y la administración intracoronaria de adenosina se asociaron de manera significativa con la discordancia RFF−/dPR+. Solo la edad < 75 años y la estenosis > 60% se asociaron de manera significativa con la discordancia RFF+/dPR−. La tasa de drift fue del 5,7%. Conclusiones: Aunque las mediciones de RFF y dPR con guía de presión de sensor óptico tienen una excelente reproducibilidad y una baja incidencia de drift, la tasa de discordancia permanece similar a la de estudios previos con guía de presión de sensor piezoeléctrico. La adenosina intracoronaria y la hipertensión arterial se asocian con la discordancia RFF−/dPR+. La edad < 75 años y la estenosis > 60% se asocian a discordancia RFF+/dPR−.
- Published
- 2024
- Full Text
- View/download PDF
28. Discordance between fractional flow reserve and nonhyperemic index with a fiber-optic pressure wire. READI EPIC-14
- Author
-
Mario Sádaba Sagredo, Asier Subinas Elorriaga, Sebastián Romaní Ménde, Daniel Valcárcel Paz, Rocío Angulo Llanos, Carlos Lara García, Alicia Quirós, Erika Muñoz García, Ángel Sánchez Recalde, Javier Robles Alonso, Fernando Lozano Ruiz-Poveda, Francisco Javier Irazusta, Alfredo Redondo, Rosa Alba Abellás Sequeiros, and Oriol Rodríguez-Leor
- Subjects
Coronary physiology ,Fractional flow reserve ,Nonhyperemic index ,Discordance ,Drift ,Medicine - Abstract
ABSTRACT Introduction and objectives: Functional assessment of coronary stenosis severity with the piezo-electric sensor pressure wire has shown a discrepancy of up to 20% between hyperemic and nonhyperemic indexes. No data are available with fiber-optic pressure wires. The aim of this study was to evaluate the incidence and factors related to the diagnostic discordance between these indexes with a fiber-optic pressure wire. Secondary aims were to assess diagnostic reproducibility in 2 consecutive measurements of fractional flow reserve (FFR) and diastolic pressure ratio (dPR) and evaluate the drift rate. Methods: We conducted a prospective, observational multicenter study in patients undergoing functional assessment with a fiber-optic pressure wire. We took 2 consecutive measurements of the dPR (cutoff point 0.89) and FFR (cut-off point 0.80) in each lesion analyzed. The diagnostic correlation between 2 measurements with the same technique and between the 2 techniques (dPR and FFR) was assessed. Clinical and angiographic factors associated with discordance (FFR−/dPR+ and FFR+/dPR−) between the 2 techniques were analyzed. Results: We included 428 cases of stenosis (361 patients). Diagnostic reproducibility was 95.8% for the dPR, with a correlation coefficient between the 2 measurements (dPR1 and dPR2) of 0.974 (P 60%. The drift rate was 5.7%. Conclusions: Although FFR and dPR measurements with a fiber-optic pressure wire have excellent reproducibility and a low drift rate, the discordance rate remains similar to those in previous studies with a piezo-electric pressure wire. FFR−/dPR+ discordance is associated with intracoronary adenosine and hypertension. FFR+/dPR− discordance is related to age < 75 years old and stenosis > 60%.
- Published
- 2024
- Full Text
- View/download PDF
29. Investigation in blood-brain barrier integrity and susceptibility to immune cell penetration in a mouse model of Dravet syndrome
- Author
-
Cristina Alonso, Alicia García-Culebras, Valentina Satta, Inés Hernández-Fisac, Álvaro Sierra, José A. Guimaré, Ignacio Lizasoain, Javier Fernández-Ruiz, and Onintza Sagredo
- Subjects
Dravet syndrome ,Infantile epileptic refractory syndromes ,Syn1-cre/Scn1aWT/A1783V mice ,Behavioural comorbidities ,BBB damage ,Immune cell infiltration ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Dravet Syndrome (DS) is a pediatric encephalopathy caused by mutations in Scn1a gene encoding the α1 subunit of the NaV1.1 voltage-gated sodium channel, which lead to early febrile seizures that progress to severe tonic-clonic seizures and several long-term behavioural comorbidities. In the present study, we have investigated whether a possible early deterioration in the blood-brain barrier (BBB) may facilitate the infiltration of immune cells to the brain parenchyma, which may contribute to these pathogenic events. In this study, conditional knock-in Scn1a-A1783V mice and their controls were used at the postnatal day (PND25): (i) to compare their levels of several immune cell populations in the bone marrow and blood; and (ii) to analyze several BBB proteins, as well as the occurrence of immune cell infiltration and endogenous immunoglobulin G (IgG) extravasation into the brain parenchyma. Our data revealed an elevation in the number of neutrophils in the blood of DS mice, but not of B- and T-cells, despite the levels of these immune cells were significantly reduced in the bone marrow. The elevated number of blood neutrophils did not apparently originate their infiltration into the hippocampus of DS mice as an immunofluorescence analysis indicated, and the same happened in B- and T-cells. However, the levels of endogenous IgG in this brain structure were significantly elevated in DS mice compared to controls, directly indicating the occurrence of extravasation into the brain parenchyma and indirectly that the BBB in DS mice may be relatively affected, a fact confirmed by the reduction in the levels of BBB-related proteins such as ZO-1 in these mice. In conclusion, our results support the occurrence of certain degree of deterioration in the BBB in DS, which may facilitate the infiltration of immune cells to the brain, then contributing to the pathogenesis in this disease.
- Published
- 2025
- Full Text
- View/download PDF
30. Shannon information entropy for a quantum nonlinear oscillator on a space of non-constant curvature
- Author
-
Ballesteros, Angel and Gutierrez-Sagredo, Ivan
- Subjects
Mathematical Physics ,Nonlinear Sciences - Exactly Solvable and Integrable Systems ,Quantum Physics - Abstract
The so-called Darboux III oscillator is an exactly solvable $N$-dimensional nonlinear oscillator defined on a radially symmetric space with non-constant negative curvature. This oscillator can be interpreted as a smooth (super)integrable deformation of the usual $N$-dimensional harmonic oscillator in terms of a non-negative parameter $\lambda$ which is directly related to the curvature of the underlying space. In this paper, a detailed study of the Shannon information entropy for the quantum version of the Darboux III oscillator is presented, and the interplay between entropy and curvature is analysed. In particular, analytical results for the Shannon entropy in the position space can be found in the $N$-dimensional case, and the known results for the quantum states of the $N$-dimensional harmonic oscillator are recovered in the limit of vanishing curvature $\lambda \to 0$. However, the Fourier transform of the Darboux III wave functions cannot be computed in exact form, thus preventing the analytical study of the information entropy in momentum space. Nevertheless, we have computed the latter numerically both in the one and three-dimensional cases and we have found that by increasing the absolute value of the negative curvature (through a larger $\lambda$ parameter) the information entropy in position space increases, while in momentum space it becomes smaller. This result is indeed consistent with the spreading properties of the wave functions of this quantum nonlinear oscillator, which are explicitly shown. The sum of the entropies in position and momentum spaces has been also analysed in terms of the curvature: for all excited states such total entropy decreases with $\lambda$, but for the ground state the total entropy is minimised when $\lambda$ vanishes, and the corresponding uncertainty relation is always fulfilled., Comment: 30 pages, 13 figures, 8 tables
- Published
- 2022
- Full Text
- View/download PDF
31. Francisco de Ávila y su breve resumen de los Comentarios reales de los Incas
- Author
-
Sagredo, Paula Martínez and García, Olivia Rojas
- Published
- 2023
32. A constitutive interferon-high immunophenotype defines response to immunotherapy in colorectal cancer
- Author
-
Acha-Sagredo, Amelia, Andrei, Pietro, Clayton, Kalum, Taggart, Emma, Antoniotti, Carlotta, Woodman, Chloé A., Afrache, Hassnae, Fourny, Constance, Armero, Maria, Moinudeen, Hafsa Kaja, Green, Mary, Bhardwaj, Nisha, Mikolajczak, Anna, Rodriguez-Lopez, Maria, Crawford, Marg, Connick, Emma, Lim, Steven, Hobson, Philip, Linares, Josep, Ignatova, Ekaterina, Pelka, Diana, Smyth, Elizabeth C., Diamantis, Nikolaos, Sosnowska, Dominika, Carullo, Martina, Ciraci, Paolo, Bergamo, Francesca, Intini, Rossana, Nye, Emma, Barral, Patricia, Mishto, Michele, Arnold, James N., Lonardi, Sara, Cremolini, Chiara, Fontana, Elisa, Rodriguez-Justo, Manuel, and Ciccarelli, Francesca D.
- Published
- 2025
- Full Text
- View/download PDF
33. Interacciones entre estilos atributivos, auto concepto académico y autoestima en estudiantes de pedagogía en educación física en Chile (Interactions between attributional styles, academic self-concept and self-esteem in physical education pedagogy students in Chile)
- Author
-
Angélica Vera-Sagredo, Felipe Poblete- Valderrama, and Yenniffer Sáez-Delgado
- Subjects
Estilos atributivos ,autoconcepto académico ,autoestima ,estudiantes de pedagogía ,Educación Física y Salud ,Sports ,GV557-1198.995 - Abstract
Este artículo examina las interacciones entre los estilos atributivos, el autoconcepto académico y la autoestima en estudiantes universitarios de Pedagogía en Educación Física y Salud. Mediante un enfoque cuantitativo descriptivo-correlacional y una muestra de 104 estudiantes chilenos, se identificaron sus perfiles en estas variables. Para la recolección de datos, se emplearon la Escala de Estilos Atributivos, la Escala de Autoconcepto Académico y el Inventario de Autoestima de Coopersmith (versión para adultos). Con el propósito de cumplir con el objetivo del estudio, se realizaron análisis descriptivos y comparativos a través de t Student y ANOVA. Del mismo modo, se efectuaron correlaciones de Pearson para identificar el vínculo entre las dimensiones de los instrumentos respecto a las variables sociodemográficas. Los principales resultados destacan la relación positiva entre causas internas y autoeficacia, así como la asociación positiva entre el fracaso por el profesor y el rendimiento percibido. También se identifica una relación positiva entre causas internas y fracaso por falta de esfuerzo. Estos hallazgos subrayan la importancia de considerar aspectos emocionales en intervenciones educativas y proporcionan información valiosa para estrategias pedagógicas específicas y el diseño de intervenciones adaptadas a las necesidades de estos estudiantes. Palabras clave: Estilos atributivos; autoconcepto académico; autoestima; estudiantes de pedagogía; Educación Física y Salud. Abstract. This article investigates the interactions between attributional styles, academic self-concept, and self-esteem among university students in Physical Education and Health Pedagogy. Utilizing a descriptive-correlational quantitative approach with a sample of 104 Chilean students, the study identified profiles across these variables. Data were collected using the Attributional Styles Scale, the Academic Self-Concept Scale, and the Coopersmith Self-Esteem Inventory (adult version). To achieve the study's objectives, descriptive and comparative analyses were conducted using Student's t-test and ANOVA. Additionally, Pearson correlations were used to explore the relationships between the dimensions of these instruments and sociodemographic variables. Key findings reveal a positive relationship between internal attribution and self-efficacy, as well as a positive association between perceived teacher failure and performance. A further positive correlation was found between internal attribution and failure due to lack of effort. These results underscore the importance of incorporating emotional factors into educational interventions and provide valuable insights for developing pedagogical strategies and tailored interventions for these students. Keywords: Attributional styles; academic self-concept; self-esteem; student teachers; Physical Education and Health.
- Published
- 2024
- Full Text
- View/download PDF
34. 21544. ICTUS PEDIÁTRICO SECUNDARIO A ARTERIOPATÍA CEREBRAL FOCAL. TROMBECTOMÍA MECÁNICA URGENTE Y REVISIÓN DE LA LITERATURA
- Author
-
F. Hernández Fernández, L. Restrepo Carvajal, L. Sánchez, B. Ocaña, Ó. Ayo Martín, B. Serrano, M. Payá Montes, V. Sánchez, T. Segura, A. Sagredo Barra, J. Gallego León, C. Domínguez Rodríguez, A. Huete, and J. Molina Nuevo
- Subjects
Neurology. Diseases of the nervous system ,RC346-429 - Published
- 2024
- Full Text
- View/download PDF
35. Prevención de los trastornos de la salud mental. Maltrato hacia la infancia y la adolescencia
- Author
-
Francisco Buitrago Ramírez, Ramon Ciurana Misol, María del Carmen Fernández Alonso, Pablo González García, Lydia Salvador Sánchez, Jorge Luis Tizón García, and Nuria Villamor Sagredo
- Subjects
Intervention ,Prevention ,Primary care ,Child abuse ,Medicine (General) ,R5-920 - Abstract
Resumen: El maltrato sobre la infancia y la adolescencia (MTIA) es un grave y complejo problema de salud pública global con efectos potencialmente devastadores en la salud y el bienestar físico y mental de las personas a lo largo de toda la vida. Se trata de un tema sanitario que, aunque no se haya reconocido hasta hace pocos decenios, posee gravísimas consecuencias sobre la vida de esos niños futuros adultos y sus familias. Al adoptar diversas formas y modalidades (violencias, abusos, negligencias y otras), resulta altamente prevalente y con graves repercusiones sobre el desarrollo personal y la morbilidad tanto mental como física. Los y las profesionales de APS pueden desempeñar una función clave en la detección del MTIA, en su exploración, en la adopción de las primeras medidas terapéuticas o mitigadoras, en la puesta en marcha de la red de cuidados sobre estos casos, y en el seguimiento a medio y largo plazo de las situaciones de maltrato. Este subprograma del PAPPS, de atención al maltrato sobre la infancia y la adolescencia, intenta proporcionar unas líneas básicas sobre cada uno de esos apartados. Abstract: Childhood and adolescent abuse (MTIA) is a serious and complex global public health problem with potentially devastating effects on the physical and mental health and well-being of people throughout their lives. This is a health issue that, although it was not recognized until a few decades ago, has very serious consequences on the lives of these future adult children and their families. By adopting various forms and modalities (violence, abuse, neglect and others), it is highly prevalent and has serious repercussions on personal development and both mental and physical morbidity. PHC professionals can play a key role in the detection of MTIA, in its exploration, in the adoption of the first therapeutic or mitigating measures, in the implementation of the care network for these cases, and in the follow-up in the medium and long term of abuse situations. This PAPPS subprogram, for attention to abuse of children and adolescents, attempts to provide some basic lines on each of these sections.
- Published
- 2024
- Full Text
- View/download PDF
36. Prevención de los trastornos de la salud mental. Antecedentes de psicopatología en los padres y cuidadores
- Author
-
Francisco Buitrago Ramírez, Coordinador del Grupo, Ramon Ciurana Misol, María del Carmen Fernández Alonso, Pablo González García, Lydia Salvador Sánchez, Jorge Luis Tizón García, and Nuria Villamor Sagredo
- Subjects
Intervention ,Prevention ,Primary care ,Parental mental illness ,Medicine (General) ,R5-920 - Abstract
Resumen: La crianza y el desarrollo psicosocial de los hijos que viven con padres con trastornos mentales graves (esquizofrenia y trastornos delirantes, depresión mayor, episodio de manía, intentos de suicidio, trastornos graves de la personalidad, alcoholismo o abusos de otras drogas y otros trastornos) pueden ser más difíciles, y su calidad de vida, sus relaciones y su salud mental pueden verse seriamente afectadas. Conseguir un cierto conocimiento en la práctica clínica que facilite la recogida y la investigación de antecedentes psiquiátricos de los padres y la identificación de factores de riesgo y señales de alerta elementales en los niños supone una mejoría en las capacidades de los equipos de Atención Primaria de Salud (APS) para integrar los elementos de salud mental en su práctica cotidiana. Se trata, además, de un paso previo imprescindible para poner en marcha intervenciones preventivas, al menos elementales, necesarias para la protección de la salud mental de esos niños y futuros adultos: ese es el núcleo de este subprograma del PAPPS para el cuidado de la salud mental de los niños y de los adolescentes en el caso de antecedentes de psicopatología en los progenitores o cuidadores. Abstract: The upbringing and psychosocial development of children who live with parents with serious mental disorders (schizophrenia and delusional disorders, major depression, manic episode, suicide attempts, severe personality disorders, alcoholism or abuse of other drugs and other disorders) can be more difficult, and your quality of life, relationships, and mental health may be seriously affected. Achieving a certain knowledge in clinical practice that facilitates the collection and investigation of parents’ psychiatric history and the identification of risk factors and basic warning signs in children, represents an improvement in the capabilities of Primary Health Care (PHC) teams to integrate mental health elements into your daily practice. It is also an essential preliminary step to implement preventive interventions, at least elementary, necessary to protect the mental health of these children and future adults: that is the core of this PAPPS subprogram for the care of the mental health of children and adolescents in the case of a history of psychopathology in parents or caregivers.
- Published
- 2024
- Full Text
- View/download PDF
37. Práctica pedagógica del profesorado de Educación Física, revisión sistemática según las directrices: PRISMA (Pedagogical practice of Physical Education teachers, systematic review according to the guidelines: PRISMA)
- Author
-
Felipe Poblete-Valderrama, Yeiro Barros Cabarca, Jhon Orrego Noreña, Angélica Vera Sagredo, Gustavo Pavez-Adasme, Alejandro Martin Rodríguez, Carolina Alvear-Mora, Laura Bertolotto Navarrete, and Katherine Hetz Rodríguez
- Subjects
Practicas Pedagógicas ,Educación Física ,Docencia ,Evaluación ,Revisión sistemática ,Sports ,GV557-1198.995 - Abstract
Este artículo tiene como objetivo realizar una revisión sistemática de los estudios llevados a cabo sobre las prácticas pedagógicas en educación física en diversos contextos. Se aborda específicamente las prácticas pedagógicas en educación física, así como otros escenarios donde se aplicaron estrategias para la enseñanza de esta asignatura. La revisión se basa en la consulta de las bases de datos Web of Science y Scopus-Elsevier, abarcando los últimos cinco años (2019-2023) en Sudamérica. A partir de esta revisión, se seleccionaron artículos que detallan experiencias formativas destinadas a estimular las prácticas pedagógicas en diversos entornos y niveles educativos. Se identificaron revisiones sistemáticas centrándose en aspectos específicos como la formación en valores, prácticas reflexivas en evaluación y otros aportes relacionados con la educación física. En términos de metodología, prevalecieron los enfoques cualitativos, siendo la entrevista el principal instrumento de recopilación de información. Por otro lado, en las metodologías cuantitativas, los cuestionarios (especialmente la escala Likert en la evaluación de competencias y autoeficacia) fueron los más utilizados. Los resultados obtenidos posicionan a Chile como líder en las investigaciones sobre este tema en la región. En conclusión, se observa una tendencia que señala que el énfasis en la cualificación de las prácticas pedagógicas del docente en educación física se concentra principalmente en su actuación profesional. Este enfoque se justifica al considerar que es desde este punto que se desarrollan las competencias necesarias para abordar las demandas actuales en los contextos específicos de Latinoamerica. Palabras Clave: Practicas Pedagógicas, Educación Física, Docencia, Evaluación, Revisión sistemática Abstract. This article aims to carry out a systematic review of the studies carried out on pedagogical practices in physical education in various contexts. Pedagogical practices in physical education are specifically addressed, as well as other scenarios where strategies for teaching this subject were applied. The review is based on the consultation of the Web of Science and Scopus-Elsevier databases, covering the last five years (2019-2023) in South America. From this review, articles were selected that detail training experiences aimed at stimulating pedagogical practices in various educational environments and levels. Systematic reviews were identified focusing on specific aspects such as training in values, reflective practices in evaluation and other contributions related to physical education. In terms of methodology, qualitative approaches prevailed, with the interview being the main instrument for collecting information. On the other hand, in quantitative methodologies, questionnaires (especially the Likert scale in the evaluation of competencies and self-efficacy) were the most used. The results obtained position Chile as a leader in research on this topic in the region. In conclusion, a trend is observed that indicates that the emphasis on the qualification of the teacher's pedagogical practices in physical education focuses mainly on their professional performance. This approach is justified by considering that it is from this point that the necessary competencies are developed to address current demands in the specific contexts of Latin America Keywords: Pedagogical Practices, Physical Education, Teaching, Assessment, Systematic review.
- Published
- 2024
- Full Text
- View/download PDF
38. Trabajo colaborativo y co-enseñanza: Sentidos que le otorgan los equipos de aula
- Author
-
Ricardo Castro-Cáceres and Emilio Sagredo Lillo
- Subjects
coeducación ,trabajo en equipo ,educación inclusiva ,docente ,cooperación educacional ,Education ,Education (General) ,L7-991 - Abstract
El presente artículo tiene como propósito comprender los sentidos que le otorgan los profesores al trabajo colaborativo al momento de realizar co-enseñanza, focalizados en contextos educativos inclusivos. Estos desafíos tienen relación con la incorporación de estrategias pedagógicas que propicien una educación inclusiva en espacios educativos regulares. El trabajo se desarrolló desde un paradigma interpretativo-comprensivo, con una metodología cualitativa, desde un enfoque fenomenológico, con estudios de casos múltiples. Según lo anterior, el abordaje de la información se efectuó a partir de la hermenéutica reflexiva que contempla el análisis estructural del discurso. El estudio consideró cuatro escuelas municipales de Educación Básica, situadas en la comuna de San Pedro de la Paz, en la región de Biobío (Chile); participaron diez duplas de aula regular, para un total de veinte participantes. Los resultados de la investigación muestran prácticas pedagógicas competitivas e individuales con relaciones profesionales tensas y jerárquicas. A esto se agregan formas de trabajo rutinario y normado con escaso margen a la reflexión y creación pedagógica.
- Published
- 2024
- Full Text
- View/download PDF
39. Editorial: Using rootstocks in crops and fruit trees to mitigate the effects of climate change and abiotic stress
- Author
-
Juan-Pablo Martínez, Boris Sagredo, and María Ángeles Moreno
- Subjects
rootstock ,abiotic stress ,fruit trees ,climate change ,crops ,heat stress ,Plant culture ,SB1-1110 - Published
- 2024
- Full Text
- View/download PDF
40. Frequency of daily living activities in older adults and their relationship with sociodemographic characteristics: A survey-based study
- Author
-
Juan Carlos Briede-Westermeyer, Martín Fuentes-Sepúlveda, Francisca Lazo-Sagredo, Alonso Molina-Reyes, Valentina Lagos-Huenuvil, and Cristhian Pérez-Villalobos
- Subjects
Older adults ,Daily living activities ,Functionality ,Confirmatory factor analysis ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background: Activities in daily living (ADL) are the fundamental actions people must take to survive, care of themselves, and integrate into their daily environment. Objective: This study has two objectives: 1) to offer a new questionnaire to assess daily living activities frequency and report evidence of their psychometric properties, and 2) to describe how often older adults in a region of Chile perform different types of daily living activities and to identify their relationship with their sociodemographic characteristics. Method: 399 older adults from the Biobío Region, Chile, chosen by quota sampling, were surveyed. They answered the DAF and a sociodemographic questionnaire, after giving their informed consent. For the data analysis, a confirmatory factor analysis (CFA) was performed and its reliability was assessed using McDonald's Omega. The relationship with the sociodemographic variables was evaluated using non-parametric bivariate statistics. Results: The results of the CFA showed an acceptable fit of the data to the eight-factor model: χ2/df = 4.188, CFI >0.915, TLI >0.903, RMSEA
- Published
- 2024
- Full Text
- View/download PDF
41. Mark Thurner, Jorge Cañizares-Esguerra (eds), The Invention of Humboldt. On the Geopolitics of Knowledge. New York and London: Routledge, 2023, 424 pp. ISBN 9781032139173.
- Author
-
Rafael Sagredo Baeza
- Subjects
History (General) ,D1-2009 - Published
- 2024
42. All noncommutative spaces of $\kappa$-Poincar\'e geodesics
- Author
-
Ballesteros, Angel, Gutierrez-Sagredo, Ivan, and Herranz, Francisco J.
- Subjects
High Energy Physics - Theory ,General Relativity and Quantum Cosmology ,Mathematical Physics - Abstract
Noncommutative spaces of geodesics provide an alternative way of introducing noncommutative relativistic kinematics endowed with quantum group symmetry. In this paper we present explicitly the seven noncommutative spaces of time-, space- and light-like geodesics that can be constructed from the time-, space- and light- versions of the $\kappa$-Poincar\'e quantum symmetry in (3+1) dimensions. Remarkably enough, only for the light-like (or null-plane) $\kappa$-Poincar\'e deformation the three types of noncommutative spaces of geodesics can be constructed, while for the time-like and space-like deformations both the quantum time-like and space-like geodesics can be defined, but not the light-like one. This obstruction comes from the constraint imposed by the coisotropy condition for the corresponding deformation with respect to the isotropy subalgebra associated to the given space of geodesics, since all these quantum spaces are constructed as quantizations of the corresponding classical coisotropic Poisson homogeneous spaces. The known quantum space of geodesics on the light cone is given by a five-dimensional homogeneous quadratic algebra, and the six nocommutative spaces of time-like and space-like geodesics are explicitly obtained as six-dimensional nonlinear algebras. Five out of these six spaces are here presented for the first time, and Darboux generators for all of them are found, thus showing that the quantum deformation parameter $\kappa^{-1}$ plays exactly the same algebraic role on quantum geodesics as the Planck constant $\hbar$ plays in the usual phase space description of quantum mechanics., Comment: 23 pages
- Published
- 2022
- Full Text
- View/download PDF
43. Unimodularity and invariant volume forms for Hamiltonian dynamics on Poisson-Lie groups
- Author
-
Gutierrez-Sagredo, I., Ponte, D. Iglesias, Marrero, J. C., Padrón, E., and Ravanpak, Z.
- Subjects
Mathematics - Differential Geometry ,Mathematical Physics ,Mathematics - Dynamical Systems ,37C40, 37J39, 53D17, 70G45, 70H05 - Abstract
In this paper, we discuss several relations between the existence of invariant volume forms for Hamiltonian systems on Poisson-Lie groups and the unimodularity of the Poisson-Lie structure. In particular, we prove that Hamiltonian vector fields on a Lie group endowed with a unimodular Poisson-Lie structure preserve a multiple of any left-invariant volume on the group. Conversely, we also prove that if there exists a Hamiltonian function such that the identity element of the Lie group is a nondegenerate singularity and the associated Hamiltonian vector field preserves a volume form, then the Poisson-Lie structure is necessarily unimodular. Furthermore, we illustrate our theory with different interesting examples, both on semisimple and unimodular Poisson-Lie groups., Comment: 17 pages
- Published
- 2022
- Full Text
- View/download PDF
44. Higher-order superintegrable momentum-dependent Hamiltonians on curved spaces from the classical Zernike system
- Author
-
Blasco, Alfonso, Gutierrez-Sagredo, Ivan, and Herranz, Francisco J.
- Subjects
Mathematical Physics ,Nonlinear Sciences - Exactly Solvable and Integrable Systems ,37J35, 70H06, 22E60, 17B62 - Abstract
We consider the classical momentum- or velocity-dependent two-dimensional Hamiltonian given by $$\mathcal H_N = p_1^2 + p_2^2 +\sum_{n=1}^N \gamma_n(q_1 p_1 + q_2 p_2)^n ,$$ where $q_i$ and $p_i$ are generic canonical variables, $\gamma_n$ are arbitrary coefficients, and $N\in \mathbb N$. For $N=2$, being both $\gamma_1,\gamma_2$ different from zero, this reduces to the classical Zernike system. We prove that $\mathcal H_N$ always provides a superintegrable system (for any value of $\gamma_n$ and $N$) by obtaining the corresponding constants of the motion explicitly, which turn out to be of higher-order in the momenta. Such generic results are not only applied to the Euclidean plane, but also to the sphere and the hyperbolic plane. In the latter curved spaces, $\mathcal H_N $ is expressed in geodesic polar coordinates showing that such a new superintegrable Hamiltonian can be regarded as a superposition of the isotropic 1:1 curved (Higgs) oscillator with even-order anharmonic curved oscillators plus another superposition of higher-order momentum-dependent potentials. Furthermore, the symmetry algebra determined by the constants of the motion is also studied, giving rise to a $(2N-1)$th-order polynomial algebra. As a byproduct, the Hamiltonian $\mathcal H_N $ is interpreted as a family of superintegrable perturbations of the classical Zernike system. Finally, it is shown that $\mathcal H_N$ (and so the Zernike system as well) is endowed with a Poisson $\mathfrak{sl}(2,\mathbb R)$-coalgebra symmetry which would allow for further possible generalizations that are also discussed., Comment: 27 pages, 4 figures. Minor corrections
- Published
- 2022
- Full Text
- View/download PDF
45. Vascular anomalies in Koolen‐de Vries syndrome: Expanding the spectrum of cutaneous findings
- Author
-
María Trinidad Hasbun Zegpi, Daniela Alfaro‐Sepúlveda, Luisa Schonhaut Berman, and Cecilia Mellado Sagredo
- Subjects
genetic diseases ,hemangioma ,Koolen-De Vries syndrome ,17q21.31 microdeletion syndrome ,vascular malformations ,Dermatology ,RL1-803 ,Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2024
- Full Text
- View/download PDF
46. Airy flair
- Author
-
Krispin, Rebecca and Sagredo, Veronica
- Published
- 2023
47. Evaluation of the Thermal Insulation Potential of Post-Harvest Blocks Using the Native Strain of the Edible Mushroom Pleurotus ostreatus
- Author
-
Miguel Aravena, Leonardo Almonacid-Muñoz, Carlos Rojas-Herrera, Héctor Herrera, Juan Pablo Cárdenas-Ramírez, Alejandro Veliz Reyes, and Cristiane Sagredo-Saez
- Subjects
mycelium ,macrofungi ,biomaterials ,thermal insulators ,Building construction ,TH1-9745 - Abstract
In recent years, the need to adopt materials that are partially or fully recyclable or biodegradable has grown significantly. This paper presents a study aiming to develop a physical and thermal characterization of post-harvest blocks (spent mushroom substrate) used in the production of the edible mushroom Pleurotus ostreatus in order to test its feasibility as an insulation material. For this purpose, culture blocks based on wheat straw residues were prepared using a wild strain of the fungus. After the mushroom harvest, the post-harvest blocks were evaluated for stability, thermal conductivity, moisture content, fire behavior, and surface analysis. The results showed that the post-harvest blocks had an average thermal conductivity of 0.032 W/mK, a density of 56.63 kg/m3, and a moisture content of 5.96%. They also exhibited high fire resistance. The culture blocks showed stable dimensional properties, reasonable productivity, low moisture, high density, and fire resistance. Therefore, results suggest that this material could be used as insulation in construction.
- Published
- 2024
- Full Text
- View/download PDF
48. The noncommutative space of light-like worldlines
- Author
-
Ballesteros, Angel, Gutierrez-Sagredo, Ivan, and Herranz, Francisco J.
- Subjects
High Energy Physics - Theory ,General Relativity and Quantum Cosmology ,Mathematical Physics - Abstract
The noncommutative space of light-like worldlines that is covariant under the light-like (or null-plane) $\kappa$-deformation of the (3+1) Poincar\'e group is fully constructed as the quantization of the corresponding Poisson homogeneous space of null geodesics. This new noncommutative space of geodesics is five-dimensional, and turns out to be defined as a quadratic algebra that can be mapped to a non-central extension of the direct sum of two Heisenberg-Weyl algebras whose noncommutative parameter is just the Planck scale parameter $\kappa^{-1}$. Moreover, it is shown that the usual time-like $\kappa$-deformation of the Poincar\'e group does not allow the construction of the Poisson homogeneous space of light-like worldlines. Therefore, the most natural choice in order to model the propagation of massless particles on a quantum Minkowski spacetime seems to be provided by the light-like $\kappa$-deformation., Comment: 16 pages. Minor corrections
- Published
- 2022
- Full Text
- View/download PDF
49. An Optimally-Tuned Starting Point for Single-Shot $GW$ Calculations of Solids
- Author
-
Gant, Stephen E., Haber, Jonah B., Filip, Marina R., Sagredo, Francisca, Wing, Dahvyd, Ohad, Guy, Kronik, Leeor, and Neaton, Jeffrey B.
- Subjects
Condensed Matter - Materials Science - Abstract
The dependence of ab initio many-body perturbation theory within the $GW$ approximation on the eigensystem used in calculating quasiparticle corrections limits this method's predictive power. Here, we investigate the accuracy of the recently developed Wannier-localized optimally tuned screened range-separated hybrid (WOT-SRSH) functional as a generalized Kohn-Sham starting point for single-shot $GW$ ($G_0W_0$) calculations for a range of semiconductors and insulators. Comparison to calculations based on well-established functionals, namely PBE, PBE0, and HSE, as well as to self-consistent $GW$ schemes and to experiment, shows that band gaps computed via $G_0W_0$@WOT-SRSH have a level of precision and accuracy that is comparable to that of more advanced methods such as quasiparticle self-consistent $GW$ (QS$GW$) and eigenvalue self-consistent $GW$ (ev$GW$). We also find that $G_0W_0$@WOT-SRSH improves the description of states deeper in the valence band manifold. Finally, we show that $G_0W_0$@WOT-SRSH significantly reduces the sensitivity of computed band gaps to ambiguities in the underlying WOT-SRSH tuning procedure.
- Published
- 2022
- Full Text
- View/download PDF
50. From basic research to clinical practice: The impact of laminar airflow filters on surgical site infection in vascular surgery
- Author
-
González-Sagredo, Albert, Castellà Durall, Albert, Carnaval, Thiago, Cedeño Peralta, Robert Josua, López-García, Paula, Callejón-Baños, Regina, Villoria, Jesús, Videla, Sebastián, Vila, Ramon, and Iborra, Elena
- Published
- 2024
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.