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1,009 results on '"Ríos, J."'

3. Statistical adiabatic channel model for termolecular reactions.

Author

Pérez-Ríos, J.

Subjects
*DEGREES of freedom, *TEMPERATURE
Abstract

In this work, we present a statistical adiabatic channel model for termolecular reactions, A + B + C → Products. Our approach relies on hyperspherical coordinates, where the adiabatic channels are readily defined in the hyper-radius after averaging the hyperangular degrees of freedom. In this way, we find a general expression for termolecular rate constants. We focus on ion-neutral association reactions to test our approach's accuracy and predictive power, finding a good agreement between theory and experiment, especially in those reactions' temperature dependence. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Sulfur recombination: A direct approach.

Author

Koots, R., Brown, G., and Pérez-Ríos, J.

Subjects
SULFUR, THRUSHES, TEMPERATURE, MEASUREMENT
Abstract

This work presents a direct three-body recombination approach of the sulfur recombination reaction, S + S + M → S2 + M, at temperatures between 100 and 500 K. Our calculations for M = Ar, based on a classical trajectory approach in hyperspherical coordinates, show excellent agreement with the experimental measurement at T = 298 K of Fair and Thrush [Trans. Faraday Soc. 65, 1208 (1969)]. Similarly, we find that the production of S2 strongly depends on the SAr product, the other possible reaction channel. Finally, using the classical threshold law, we check sulfur recombination with another third body, M = H2S, and find no significant change in the rate. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Influence of laparoscopic surgery on the outcomes of radical cystectomy within a multimodal rehabilitation protocol

Author

Muñiz Suárez, L., Subirá Ríos, J., Gayarre Abril, P., Montero Martorán, A., Hijazo Conejos, J.I., García Alarcón, J., García-Magariño Alonso, J., Medrano Llorente, P., Ramírez Fabián, M., Elizalde Benito, F.X., Murillo Pérez, C., Utrilla Ibuarben, M., Asensio Matas, A., Marín Zaldívar, C., Casans Francés, R., Ramírez Rodríguez, J.M., Blasco Beltrán, B., and Carrera-Lasfuentes, P.

Published
2024
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7. Influencia de la cirugía laparoscópica dentro de un protocolo de rehabilitación multimodal en cistectomía radical

Author

Muñiz Suárez, L., Subirá Ríos, J., Gayarre Abril, P., Montero Martorán, A., Hijazo Conejos, J.I., García Alarcón, J., García-Magariño Alonso, J., Medrano Llorente, P., Ramírez Fabián, M., Elizalde Benito, F.X., Murillo Pérez, C., Utrilla Ibuarben, M., Asensio Matas, A., Marín Zaldívar, C., Casans Francés, R., Ramírez Rodríguez, J.M., Blasco Beltrán, B., and Carrera-Lasfuentes, P.

Published
2024
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14. Optimal control approach for moving bottom detection in one‐dimensional shallow waters by surface measurements.

Author

Lecaros, R., López‐Ríos, J., Montecinos, G. I., and Zuazua, E.

Subjects
*FINITE volume method, *COMPUTATIONAL physics, *WATER depth, *WATER waves, *FREE surfaces
Abstract

We consider the Boussinesq‐Peregrine (BP) system as described by Lannes [Lannes, D. (2013). The water waves problem: mathematical analysis and asymptotics (Vol. 188). American Mathematical Soc.], within the shallow water regime, and study the inverse problem of determining the time and space variations of the channel bottom profile, from measurements of the wave profile and its velocity on the free surface. A well‐posedness result within a Sobolev framework for (BP), considering a time dependent bottom, is presented. Then, the inverse problem is reformulated as a nonlinear PDE‐constrained optimization one. An existence result of the minimum, under constraints on the admissible set of bottoms, is presented. Moreover, an implementation of the gradient descent approach, via the adjoint method, is considered. For solving numerically both, the forward (BP) and its adjoint system, we derive a universal and low‐dissipation scheme, which contains non‐conservative products. The scheme is based on the FORCE‐ α$$ \alpha $$ method proposed in [Toro, E. F., Saggiorato, B., Tokareva, S., and Hidalgo, A. (2020). Low‐dissipation centred schemes for hyperbolic equations in conservative and non‐conservative form. Journal of Computational Physics, 416, 109545]. Finally, we implement this methodology to recover three different bottom profiles; a smooth bottom, a discontinuous one, and a continuous profile with a large gradient. We compare with two classical discretizations for (BP) and the adjoint system. These results corroborate the effectiveness of the proposed methodology to recover bottom profiles. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Repeated Structural Reworking in the Basement of the Central Colombian Andes Unraveled by a Multi‐Chronometric Approach.

Author

Zapata, S., Cardona, A., Jaramillo‐Ríos, J. S., Siachoque, A., Peverelli, V., Chew, D., Wemmer, K., Rodríguez, M. C., Valencia‐Gomez, J. C., Sobel, E. R., Calderon‐Diaz, L. C., Valencia, V. A., Patiño, A. M., Parra, M., Botello, G. E., and Glodny, J.

Subjects
BASEMENTS, DEFORMATIONS (Mechanics), CARTOGRAPHY, ZIRCON, APATITE
Abstract

Long‐lived orogens are often characterized by basement blocks affected by polyphase thick‐skinned deformation. Deciphering these events is challenging due to the heterogeneous and complex structural histories resulting from the superposition of multiple deformation phases. For instance, the Central Cordillera of Colombia was shaped by multiple tectonic phases during the Mesozoic and Cenozoic, which have been poorly constrained in both space and time. To unravel the deformation history of this mountain belt, we conducted field mapping and applied a multi‐chronometric approach that included zircon and apatite U‐Pb dating of the igneous basement, epidote and titanite U‐Pb dating of structurally controlled mineralization events, K‐Ar dating of fault rock illite, and fission track and (U‐Th‐Sm)/He bedrock thermochronology of apatite and zircon. The results reveal six deformation events along two fault systems during the past 184 Myr. This deformation history started in the Jurassic with structurally controlled magmatism and ductile deformation; followed by brittle‐ductile and fluid‐assisted basin subsidence and inversion during the Cretaceous. Finally, the Cenozoic was characterized by brittle strike‐slip and compressional deformation. Our findings show the basement response to polyphase reworking, highlighting the prominent role of ancient upper‐plate discontinuities, magmatism, and fluids. Key Points: Polyphase extensional, compressional, and strike‐slip deformation in the Northern Andes Central CordilleraA geo‐ and thermochronological approach unravels the detailed deformation history of the Northern AndesRelations between exhumation, hydrothermal activity, and rock metamorphism during basement reworking [ABSTRACT FROM AUTHOR]

Published
2024
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18. Outcome of treatment of MDR-TB or drug-resistant patients treated with bedaquiline and delamanid: Results from a large global cohort

Author

Koirala, S., Borisov, S., Danila, E., Mariandyshev, A., Shrestha, B., Lukhele, N., Dalcolmo, M., Shakya, S.R., Miliauskas, S., Kuksa, L., Manga, S., Aleksa, A., Denholm, J.T., Khadka, H.B., Skrahina, A., Diktanas, S., Ferrarese, M., Bruchfeld, J., Koleva, A., Piubello, A., Koirala, G.S., Udwadia, Z.F., Palmero, D.J., Munoz-Torrico, M., GC, R., Gualano, G., Grecu, V.I., Motta, I., Papavasileiou, A., Li, Y., Hoefsloot, W., Kunst, H., Mazza-Stalder, J., Payen, M.-C., Akkerman, O.W., Bernal, E., Manfrin, V., Matteelli, A., Mustafa Hamdan, H., Nieto Marcos, M., Cadiñanos Loidi, J., Cebrian Gallardo, J.J., Duarte, R., Escobar Salinas, N., Gomez Rosso, R., Laniado-Laborín, R., Martínez Robles, E., Quirós Fernandez, S., Rendon, A., Solovic, I., Tadolini, M., Viggiani, P., Belilovski, E., Boeree, M.J., Cai, Q., Davidavičienė, E., Forsman, L.D., De Los Rios, J., Drakšienė, J., Duga, A., Elamin, S.E., Filippov, A., Garcia, A., Gaudiesiute, I., Gavazova, B., Gayoso, R., Gruslys, V., Jonsson, J., Khimova, E., Madonsela, G., Magis-Escurra, C., Marchese, V., Matei, M., Moschos, C., Nakčerienė, B., Nicod, L., Palmieri, F., Pontarelli, A., Šmite, A., Souleymane, M.B., Vescovo, M., Zablockis, R., Zhurkin, D., Alffenaar, J.-W., Caminero, J.A., Codecasa, L.R., García-García, J.-M., Esposito, S., Saderi, L., Spanevello, A., Visca, D., Tiberi, S., Pontali, E., Centis, R., D'Ambrosio, L., van den Boom, M., Sotgiu, G., and Migliori, G.B.

Published
2021
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23. “Informativo matinal para ahorrar tiempo”. Un noticiario alternativo con fandom propio.

Author

Cano-Orón, L. and Gamir-Ríos, J.

Subjects
*SOCIAL networks, *TELEVISION broadcasting of news, *FANS (Persons), *COMEDIANS, *NARRATIVES
Abstract

Comedian Ángel Martín edits and presents the Informativo matinal para ahorrar tiempo (IMPAT), a daily two-minute audiovisual newscast distributed on major social networks, with a daily audience of around one million views. This format has generated a community of followers who expand its original content by creating mimetic sector-specific news programs. This study analyzes the thematic agenda and stylistic features of the IMPAT, as well as the news programs developed by its followers. The results show a predominance of soft news and non-news content, as well as the presence of narrative traits characteristic of infotainment. The followers expand the IMPAT by creating their own news programs, also focused on soft news and with similar styles. Thus, IMPAT stands out as an alternative newscast around which a unique informational fandom has been consolidated, with content generated by its users as news prodesigners. [ABSTRACT FROM AUTHOR]

Published
2024
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26. A Review of the EUSO-Balloon Pathfinder for the JEM-EUSO Program

Author

Adams, Jr., J. H., Ahmad, S., Allard, D., Anzalone, A., Bacholle, S., Barrillon, P., Bayer, J., Bertaina, M., Bisconti, F., Blaksley, C., Blin-Bondil, S., Bobík, P., Cafagna, F., Campana, D., Capel, F., Casolino, M., Cassardo, C., Catalano, C., Cremonini, R., Dagoret-Campagne, S., Danto, P., del Peral, L., de la Taille, C., Díaz Damian, A., Dupieux, M., Ebersoldt, A., Ebisuzaki, T., Eser, J., Evrard, J., Fenu, F., Ferrarese, S., Fornaro, C., Fouka, M., Gorodetzky, P., Guarino, F., Guzman, A., Hachisu, Y., Haungs, A., Judd, E., Jung, A., Karczmarczyk, J., Kawasaki, Y., Klimov, P. A., Kuznetsov, E., Mackovjak, S., Manfrin, M., Marcelli, L., Medina-Tanco, G., Mercier, K., Merino, A., Mernik, T., Miyamoto, H., Morales de los Ríos, J. A., Moretto, C., Mot, B., Neronov, A., Ohmori, H., Olinto, A. V., Osteria, G., Panico, B., Parizot, E., Paul, T., Picozza, P., Piotrowski, L. W., Plebaniak, Z., Pliego, S., Prat, P., Prévôt, G., Prieto, H., Putis, M., Rabanal, J., Ricci, M., Rojas, J., Rodríguez Frías, M. D., Roudil, G., Sáez Cano, G., Sahnoun, Z., Sakaki, N., Sanchez, J. C., Santangelo, A., Sarazin, F., Scotti, V., Shinozaki, K., Silva, H., Soriano, J. F., Suino, G., Szabelski, J., Toscano, S., Tabone, I., Takizawa, Y., von Ballmoos, P., Wiencke, L., Wille, M., and Zotov, M.

Published
2022
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30. Risk Factors for Mortality in Pediatric Postsurgical versus Medical Severe Sepsis

Author

Fontela, P., Tucci, M., Dumistrascu, M., Skippen, P., Krahn, G., Bezares, E., Puig, G., Puig-Ramos, A., Garcia, R., Villar, M., Bigham, M., Polanski, T., Latifi, S., Giebner, D., Anthony, H., Hume, J., Galster, A., Linnerud, L., Sanders, R., Hefley, G., Madden, K., Thompson, A., Shein, S., Gertz, S., Han, Y., Williams, T., Hughes-Schalk, A., Chandler, H., Orioles, A., Zielinski, E., Doucette, A., Zebuhr, C., Wilson, T., Dimitriades, C., Ascani, J., Layburn, S., Valley, S., Markowitz, B., Terry, J., Morzov, R., Mcinnes, A., McArthur, J., Woods, K., Murkowski, K., Spaeder, M., Sharron, M., Wheeler, D., Beckman, E., Frank, E., Howard, K., Carroll, C., Nett, S., Jarvis, D., Patel, V., Higgerson, R., Christie, L., Typpo, K., Deschenes, J., Kirby, A., Uhl, T., Rehder, K., Cheifetz, I., Wrenn, S., Kypuros, K., Ackerman, K., Maffei, F., Bloomquist, G., Rizkalla, N., Kimura, D., Shah, S., Tigges, C., Su, F., Barlow, C., Michelson, K., Wolfe, K., Goodman, D., Campbell, L., Sorce, L., Bysani, K., Monjure, T., Evans, M., Totapally, B., Chegondi, M., Rodriguez, C., Frazier, J., Steele, L., Viteri, S., Costarino, A., Thomas, N., Spear, D., Hirshberg, E., Lilley, J., Rowan, C., Rider, C., Kane, J., Zimmerman, J., Greeley, C., Lin, J., Jacobs, R., Parker, M., Culver, K., Loftis, L., Jaimon, N., Goldsworthy, M., Fitzgerald, J., Weiss, S., Nadkarni, V., Bush, J., Diliberto, M., Allen, C., Gessouroun, M., Sapru, A., Lang, T., Alkhouli, M., Kamath, S., Friel, D., Daufeldt, J., Hsing, D., Carlo, C., Pon, S., Scimeme, J., Shaheen, A., Hassinger, A., Qiao, H., Giuliano, J., Tala, J., Vinciguerra, D., Fernandez, A., Carrero, R., Hoyos, P., Jaramillo, J., Posada, A., Izquiierdo, L., Olave, B.E. Piñeres, Donado, J., Dalmazzo, R., Rendich, S., Palma, L., Lapadula, M., Acuna, C., Cruces, P., De Clety, S. Clement, Dujardin, M., Berghe, C., Renard, S., Zurek, J., Steinherr, H., Mougkou, K., Critselis, E., Di Nardo, M., Picardo, S., Tortora, F., Rossetti, E., Fragasso, T., Cogo, P., Netto, R., Dagys, A., Gurskis, V., Kevalas, R., Neeleman, C., Lemson, J., Luijten, C., Wojciech, K., Pagowska-Klimek, I., Szczepanska, M., Karpe, J., Nunes, P., Almeida, H., Rios, J., Vieira, M., Iniguez, J. P. Garcia, Revilla, P., Urbano, J., Lopez-Herce, J., Bustinza, A., Palacios, A., Hofheinz, S., Rodriguez-Nunez, A., Sanagustin, S., Gonzalez, E., Riaza, M., Piaya, R., Soler, P., Esteban, E., Laraudogoitia, J., Monge, C., Herrera, V., Granados, J., Gonzalez, C., Koroglu, T., Ozcelik, E., Baines, P., Plunkett, A., Davis, P., George, S., Tibby, S., Harris, J., Agbeko, R., Lampitt, R., Brierley, J., Peters, M., Jones, A., Dominguez, T., Thiruchelvam, T., Deep, A., Ridley, L., Bowen, W., Levin, R., Macleod, I., Gray, M., Hemat, N., Alexander, J., Ali, S., Pappachan, J., McCorkell, J., Fortune, P., MacDonald, M., Hudnott, P., Suyun, Q., Singhi, S., Nallasamy, K., Lodha, R., Shime, N., Tabata, Y., Saito, O., Ikeyama, T., Kawasaki, T., Lum, L., Abidin, A., Kee, S., Tang, S., Jalil, R., Guan, Y., Yao, L., Lin, K., Ong, J., Salloo, A., Doedens, L., Mathivha, L., Reubenson, G., Moaisi, S., Pentz, A., Green, R., Schibler, A., Erickson, S., McEneiry, J., Long, D., Dorofaeff, T., Coulthard, M., Millar, J., Delzoppo, C., Williams, G., Morritt, M., Watts, N., Beca, J., Sherring, C., Bushell, T., Thakkar, Rajan K., Weiss, Scott L., Fitzgerald, Julie C., Keele, Luke, Thomas, Neal J., Nadkarni, Vinay M., Muszynski, Jennifer A., and Hall, Mark W.

Published
2019
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33. Efficient numerical algorithm for multi-level ionization of high-atomic-number gases.

Author

Cheng, A., Samulyak, R., Kupfer, R., Pérez-Ríos, J., and Vafaei-Najafabadi, N.

Subjects
QUANTUM numbers, ALGORITHMS, DIFFERENTIAL equations, ANALYTICAL solutions, ATOMIC number, GASES
Abstract

An efficient numerical algorithm for laser driven multi-level ionization of high-atomic-number gases is proposed and implemented in an electromagnetic particle-in-cell code SPACE. The algorithm is based on analytical solutions to the system of differential equations describing ionization evolution. Using analytical solutions resolves the multiscale issue of ionization due to different characteristic time scales of ionization processes and the main code time step. Algorithm efficiency and memory requirements are significantly improved by using a locally reduced system of differential equations. The algorithm also assigns proper orbital quantum numbers and their projections to ionization states. The algorithm is verified and validated using experimental data. [ABSTRACT FROM AUTHOR]

Published
2024
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34. The chemistry of AlF and CaF production in buffer gas sources.

Author

Liu, X., Wang, W., Wright, S. C., Doppelbauer, M., Meijer, G., Truppe, S., and Pérez-Ríos, J.

Subjects
MOLECULAR beams, MOLECULAR dynamics, CHEMICAL reactions, BAYESIAN field theory, CHEMICAL properties
Abstract

In this work, we explore the role of chemical reactions on the properties of buffer gas cooled molecular beams. In particular, we focus on scenarios relevant to the formation of AlF and CaF via chemical reactions between the Ca and Al atoms ablated from a solid target in an atmosphere of a fluorine-containing gas, in this case, SF6 and NF3. Reactions are studied following an ab initio molecular dynamics approach, and the results are rationalized following a tree-shaped reaction model based on Bayesian inference. We find that NF3 reacts more efficiently with hot metal atoms to form monofluoride molecules than SF6. In addition, when using NF3, the reaction products have lower kinetic energy, requiring fewer collisions to thermalize with the cryogenic helium. Furthermore, we find that the reaction probability for AlF formation is much higher than for CaF across a broad range of kinetic temperatures. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Spectroscopic characterization of the a3Π state of aluminum monofluoride.

Author

Walter, N., Doppelbauer, M., Marx, S., Seifert, J., Liu, X., Pérez-Ríos, J., Sartakov, B. G., Truppe, S., and Meijer, G.

Subjects
MOLECULAR beams, ALUMINUM, LASER cooling, PHOTON scattering, METASTABLE states, PRASEODYMIUM
Abstract

Spectroscopic studies of aluminum monofluoride (AlF) have revealed its highly favorable properties for direct laser cooling. All Q lines of the strong A1Π ← X1Σ+ transition around 227 nm are rotationally closed and thereby suitable for the main cooling cycle. The same holds for the narrow, spin-forbidden a3Π ← X1Σ+ transition around 367 nm, which has a recoil limit in the µK range. We here report on the spectroscopic characterization of the lowest rotational levels in the a3Π state of AlF for v = 0–8 using a jet-cooled, pulsed molecular beam. An accidental AC Stark shift is observed on the a3Π0, v = 4 ← X1Σ+, v = 4 band. By using time-delayed ionization for state-selective detection of the molecules in the metastable a3Π state at different points along the molecular beam, the radiative lifetime of the a3Π1, v = 0, J = 1 level is experimentally determined as τ = 1.89 ± 0.15 ms. A laser/radio frequency multiple resonance ionization scheme is employed to determine the hyperfine splittings in the a3Π1, v = 5 level. The experimentally derived hyperfine parameters are compared to the outcome of quantum chemistry calculations. A spectral line with a width of 1.27 kHz is recorded between hyperfine levels in the a3Π, v = 0 state. These measurements benchmark the electronic potential of the a3Π state and yield accurate values for the photon scattering rate and for the elements of the Franck–Condon matrix of the a3Π–X1Σ+ system. [ABSTRACT FROM AUTHOR]

Published
2022
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49. Volatilome Analysis of Soursop Fruits for the Determination of Kairomone Components That Attract the Annonaceae Fruit Weevil (Optatus palmaris Pascoe).

Author

Pineda-Ríos, J. M., Cibrián-Tovar, J., López-Romero, R. M., Hernández-Fuentes, L. M., Soto-Rojas, L., Llanderal-Cázares, C., García-Sosa, P. R., and Salomé-Abarca, L. F.

Subjects
CURCULIONIDAE, ANNONACEAE, FRUIT, FIELD research, SEMIOCHEMICALS
Abstract

Soursop possesses the largest fruit size of the Annona genus. However, this species is threatened by the Annonaceae fruit weevil (Optatus palmaris), which can cause the destruction of whole soursop fruits. Recently, the potential of semiochemicals for the management of this insect is highlighted, and its aggregation pheromone has been elucidated. This pheromone works well only when mixed with soursop volatiles. Thus, the aim of this research was to determine specific kairomone components to potentiate the aggregation pheromone of this Annonaceae fruit weevil. This task was carried out via volatilome analysis of soursop fruits, which was correlated with the biological activity of the identified volatiles. The GC–MS analysis of aroma collections of mature soursop fruits and flowers, determined using multivariate data analysis, confirmed a volatile differentiation between these organs. The volatile variation between fruits and flowers was reflected in weevils' preference for mature fruits instead of flowers. Moreover, weevils' response to soursop fruits increased with more mature fruits. This was correlated with volatile changes throughout the phenological stages of soursop fruits. The two volatiles most correlated with weevils' attraction were benzothiazole and (E)-β-caryophyllene. These volatiles only evoked a response when mixed and potentiated the attraction of the aggregation pheromone. Thus, these two volatiles are active kairomone components with the potential for being used in combination with the aggregation pheromone of Annonaceae fruit weevils in field trials. [ABSTRACT FROM AUTHOR]

Published
2023
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