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18 results on '"González-Merino, P."'

2. Earth's albedo variations 1998-2014 as measured from ground-based earthshine observations

Author

Palle, E, Goode, PR, Montanes-Rodriguez, P Pilar, Shumko, A, Gonzalez-Merino, B, Lombilla, C Martinez, Jimenez-Ibarra, F, Shumko, S, Sanroma, E, Hulist, A, Miles-Paez, P, Murgas, F, Nowak, G, and Koonin, SE

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The Earth's albedo is a fundamental climate parameter for understanding the radiation budget of the atmosphere. It has been traditionally measured from space platforms, but also from the ground for sixteen years from Big Bear Solar Observatory by observing the Moon. The photometric ratio of the dark (earthshine) to the bright (moonshine) sides of the Moon is used to determine nightly anomalies in the terrestrial albedo, with the aim is of quantifying sustained monthly, annual and/or decadal changes. We find two modest decadal scale cycles in the albedo, but with no significant net change over the sixteen years of accumulated data. Within the evolution of the two cycles, we find periods of sustained annual increases, followed by comparable sustained decreases in albedo. The evolution of the earthshine albedo is in remarkable agreement with that from the CERES instruments, although each method measures different slices of the Earth's Bond albedo., Comment: Accepted for publication in Geophysical Research Letters

Published
2016
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4. Jupiter as an exoplanet: UV to NIR transmission spectrum reveals hazes, a Na layer and possibly stratospheric H2O-ice clouds

Author

Montañes-Rodriguez, P., Gonzalez-Merino, B, Palle, E., Lopez-Puertas, M., and Garcia-Melendo, E.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Currently, the analysis of transmission spectra is the most successful technique to probe the chemical composition of exoplanet atmospheres. But the accuracy of these measurements is constrained by observational limitations and the diversity of possible atmospheric compositions. Here we show the UV-VIS-IR transmission spectrum of Jupiter, as if it were a transiting exoplanet, obtained by observing one of its satellites, Ganymede, while passing through Jupiter's shadow i.e., during a solar eclipse from Ganymede. The spectrum shows strong extinction due to the presence of clouds (aerosols) and haze in the atmosphere, and strong absorption features from CH4. More interestingly, the comparison with radiative transfer models reveals a spectral signature, which we attribute here to a Jupiter stratospheric layer of crystalline H2O ice. The atomic transitions of Na are also present. These results are relevant for the modeling and interpretation of giant transiting exoplanets. They also open a new technique to explore the atmospheric composition of the upper layers of Jupiter's atmosphere., Comment: Accepted for publication in ApJ Letters

Published
2015
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6. Earthshine observations at high spectral resolution: Exploring and detecting metal lines in the Earth's upper atmosphere

Author

González-Merino, B., Pallé, E., Motalebi, F., Montañés-Rodríguez, P., and Kissler-Patig, M.

Subjects
Physics - Space Physics, Astrophysics - Earth and Planetary Astrophysics
Abstract

Observations of the Earth as a planet using the earthshine technique (i.e. looking at the light reflected from the darkside of the Moon), have been used for climate and astrobiology studies. They provide information about the planetary albedo, a fundamental parameter of the Earth's energy balance. Here we present for the first time, observations of the earthshine taken at high spectral resolution. The high spectral resolution was chosen in order to investigate the possibility of detecting metallic layers in the Earth's atmosphere of geological or meteoritic origin. The SARG echelle spectrograph at the Telescopio Nazionale Galileo in La Palma was used to acquire the earthshine data. Observations were carried out on several nights in February 2011, with the spectral resolution set at 29,000, covering a spectral range from the near-ultraviolet (360 nm) to near-infrared (1011.9 nm). While we find evidence for the detection of a Na layer in the earthshine, other atomic species are not detected, perhaps due to the low signal-to-noise ratio of the observations and the difficult telluric corrections. The Na layer is found to vary between observation dates, which we speculate is due to physical variations in mesospheric Na concentrations., Comment: 7 pages, 8 figures, 2 tables. Accepted for for publication in MNRAS

Published
2013
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9. Uso de harina de mejillones (Mytilus galloprovincialis) en la alimentación del ovino: digestión ruminal

Author

Centre International de Hautes Études Agronomiques Méditerranéennes (France), Toral, Pablo G. [0000-0002-1913-7707], Hervás, Gonzalo [0000-0002-0013-7459], Frutos, Pilar [0000-0002-4919-5094], Barrio, Esther [0000-0003-0714-1407], Shaklouf, M.M., Frutos, Pilar, Barrio, Esther, Mendoza, Alejandro G., Toral, Pablo G., González-Merino, P., Hervás, Gonzalo, Centre International de Hautes Études Agronomiques Méditerranéennes (France), Toral, Pablo G. [0000-0002-1913-7707], Hervás, Gonzalo [0000-0002-0013-7459], Frutos, Pilar [0000-0002-4919-5094], Barrio, Esther [0000-0003-0714-1407], Shaklouf, M.M., Frutos, Pilar, Barrio, Esther, Mendoza, Alejandro G., Toral, Pablo G., González-Merino, P., and Hervás, Gonzalo

Published
2023

10. Uso de harina de mejillones (Mytilus galloprovincialis) en la alimentación del ovino: digestión ruminal

Author

Shaklouf, M.M., Frutos, Pilar, Barrio, Esther, Mendoza, Alejandro G., Toral, Pablo G., González-Merino, P., Hervás, Gonzalo, Centre International de Hautes Études Agronomiques Méditerranéennes (France), Toral, Pablo G., Hervás, Gonzalo, Frutos, Pilar, and Barrio, Esther

Subjects
Ensure healthy lives and promote well-being for all at all ages, Responsible Consumption and Production
Abstract

Trabajo presentado a las: XX Jornadas sobre Producción Animal AIDA, p. 125. 13-14 junio. Zaragoza (España)., M.M. Shaklouf agradece la beca recibida del IAMZ-CIHEAM.

Published
2023

11. The EChO science case

Author

Tinetti, Giovanna, Drossart, Pierre, Eccleston, Paul, Hartogh, Paul, Isaak, Kate, Linder, Martin, Lovis, Christophe, Micela, Giusi, Ollivier, Marc, Puig, Ludovic, Ribas, Ignasi, Snellen, Ignas, Swinyard, Bruce, Allard, France, Barstow, Joanna, Cho, James, Coustenis, Athena, Cockell, Charles, Correia, Alexandre, Decin, Leen, de Kok, Remco, Deroo, Pieter, Encrenaz, Therese, Forget, Francois, Glasse, Alistair, Griffith, Caitlin, Guillot, Tristan, Koskinen, Tommi, Lammer, Helmut, Leconte, Jeremy, Maxted, Pierre, Mueller-Wodarg, Ingo, Nelson, Richard, North, Chris, Pallé, Enric, Pagano, Isabella, Piccioni, Guseppe, Pinfield, David, Selsis, Franck, Sozzetti, Alessandro, Stixrude, Lars, Tennyson, Jonathan, Turrini, Diego, Zapatero-Osorio, Mariarosa, Beaulieu, Jean-Philippe, Grodent, Denis, Guedel, Manuel, Luz, David, Nørgaard-Nielsen, Hans Ulrik, Ray, Tom, Rickman, Hans, Selig, Avri, Swain, Mark, Banaszkiewicz, Marek, Barlow, Mike, Bowles, Neil, Branduardi-Raymont, Graziella, du Foresto, Vincent Coudé, Gerard, Jean-Claude, Gizon, Laurent, Hornstrup, Allan, Jarchow, Christopher, Kerschbaum, Franz, Kovacs, Géza, Lagage, Pierre-Olivier, Lim, Tanya, Lopez-Morales, Mercedes, Malaguti, Giuseppe, Pace, Emanuele, Pascale, Enzo, Vandenbussche, Bart, Wright, Gillian, Zapata, Gonzalo Ramos, Adriani, Alberto, Azzollini, Ruymán, Balado, Ana, Bryson, Ian, Burston, Raymond, Colomé, Josep, Crook, Martin, Di Giorgio, Anna, Griffin, Matt, Hoogeveen, Ruud, Ottensamer, Roland, Irshad, Ranah, Middleton, Kevin, Morgante, Gianluca, Pinsard, Frederic, Rataj, Mirek, Reess, Jean-Michel, Savini, Giorgio, Schrader, Jan-Rutger, Stamper, Richard, Winter, Berend, Abe, L., Abreu, M., Achilleos, N., Ade, P., Adybekian, V., Affer, L., Agnor, C., Agundez, M., Alard, C., Alcala, J., Allende Prieto, C., Alonso Floriano, F. J., Altieri, F., Alvarez Iglesias, C. A., Amado, P., Andersen, A., Aylward, A., Baffa, C., Bakos, G., Ballerini, P., Banaszkiewicz, M., Barber, R. J., Barrado, D., Barton, E. J., Batista, V., Bellucci, G., Belmonte Avilés, J. A., Berry, D., Bézard, B., Biondi, D., Błęcka, M., Boisse, I., Bonfond, B., Bordé, P., Börner, P., Bouy, H., Brown, L., Buchhave, L., Budaj, J., Bulgarelli, A., Burleigh, M., Cabral, A., Capria, M. T., Cassan, A., Cavarroc, C., Cecchi-Pestellini, C., Cerulli, R., Chadney, J., Chamberlain, S., Charnoz, S., Christian Jessen, N., Ciaravella, A., Claret, A., Claudi, R., Coates, A., Cole, R., Collura, A., Cordier, D., Covino, E., Danielski, C., Damasso, M., Deeg, H. J., Delgado-Mena, E., Del Vecchio, C., Demangeon, O., De Sio, A., De Wit, J., Dobrijévic, M., Doel, P., Dominic, C., Dorfi, E., Eales, S., Eiroa, C., Espinoza Contreras, M., Esposito, M., Eymet, V., Fabrizio, N., Fernández, M., Femenía Castella, B., Figueira, P., Filacchione, G., Fletcher, L., Focardi, M., Fossey, S., Fouqué, P., Frith, J., Galand, M., Gambicorti, L., Gaulme, P., García López, R. J., Garcia-Piquer, A., Gear, W., Gerard, J.-C., Gesa, L., Giani, E., Gianotti, F., Gillon, M., Giro, E., Giuranna, M., Gomez, H., Gomez-Leal, I., Gonzalez Hernandez, J., González Merino, B., Graczyk, R., Grassi, D., Guardia, J., Guio, P., Gustin, J., Hargrave, P., Haigh, J., Hébrard, E., Heiter, U., Heredero, R. L., Herrero, E., Hersant, F., Heyrovsky, D., Hollis, M., Hubert, B., Hueso, R., Israelian, G., Iro, N., Irwin, P., Jacquemoud, S., Jones, G., Jones, H., Justtanont, K., Kehoe, T., Kerschbaum, F., Kerins, E., Kervella, P., Kipping, D., Koskinen, T., Krupp, N., Lahav, O., Laken, B., Lanza, N., Lellouch, E., Leto, G., Licandro Goldaracena, J., Lithgow-Bertelloni, C., Liu, S. J., Lo Cicero, U., Lodieu, N., Lognonné, P., Lopez-Puertas, M., Lopez-Valverde, M. A., Lundgaard Rasmussen, I., Luntzer, A., Machado, P., MacTavish, C., Maggio, A., Maillard, J.-P., Magnes, W., Maldonado, J., Mall, U., Marquette, J.-B., Mauskopf, P., Massi, F., Maurin, A.-S., Medvedev, A., Michaut, C., Miles-Paez, P., Montalto, M., Montañés Rodríguez, P., Monteiro, M., Montes, D., Morais, H., Morales, J. C., Morales-Calderón, M., Morello, G., Moro Martín, A., Moses, J., Moya Bedon, A., Murgas Alcaino, F., Oliva, E., Orton, G., Palla, F., Pancrazzi, M., Pantin, E., Parmentier, V., Parviainen, H., Peña Ramírez, K. Y., Peralta, J., Perez-Hoyos, S., Petrov, R., Pezzuto, S., Pietrzak, R., Pilat-Lohinger, E., Piskunov, N., Prinja, R., Prisinzano, L., Polichtchouk, I., Poretti, E., Radioti, A., Ramos, A. A., Rank-Lüftinger, T., Read, P., Readorn, K., Rebolo López, R., Rebordão, J., Rengel, M., Rezac, L., Rocchetto, M., Rodler, F., Sánchez Béjar, V. J., Sanchez Lavega, A., Sanromá, E., Santos, N., Sanz Forcada, J., Scandariato, G., Schmider, F.-X., Scholz, A., Scuderi, S., Sethenadh, J., Shore, S., Showman, A., Sicardy, B., Sitek, P., Smith, A., Soret, L., Sousa, S., Stiepen, A., Stolarski, M., Strazzulla, G., Tabernero, H. M., Tanga, P., Tecsa, M., Temple, J., Terenzi, L., Tessenyi, M., Testi, L., Thompson, S., Thrastarson, H., Tingley, B. W., Trifoglio, M., Martín Torres, J., Tozzi, A., Turrini, D., Varley, R., Vakili, F., de Val-Borro, M., Valdivieso, M. L., Venot, O., Villaver, E., Vinatier, S., Viti, S., Waldmann, I., Waltham, D., Ward-Thompson, D., Waters, R., Watkins, C., Watson, D., Wawer, P., Wawrzaszk, A., White, G., Widemann, T., Winek, W., Wiśniowski, T., Yelle, R., Yung, Y., and Yurchenko, S. N.

Published
2015
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12. Efecto de consorcios microbianos en el patosistema Solanum lycopersicum - Fusarium oxysporum f. sp. lycopersici.

Author

Limón-Corona, Mónica Lorena, Flores-Olivas, Alberto, Hernández-Castillo, Francisco Daniel, González-Merino, Ana María, González-Morales, Susana, Virgen-Calleros, Gil, Cerda-García, Pedro Aarón, and Hernández-Martínez, Rufina

Subjects
FUSARIUM oxysporum, PLANT growth-promoting rhizobacteria, TOMATOES, MYCORRHIZAS, FUNGICIDES, YEAST
Abstract

Copyright of Ecosistemas y Recursos Agropecuarios is the property of Universidad Juarez Autonoma de Tabasco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2022
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13. Manufacture of polyurethane foam parts for automotive industry using FDM 3D printed molds.

Author

Romero, Pablo E., Arribas-Barrios, Jose, Rodriguez-Alabanda, Oscar, González-Merino, Ramón, and Guerrero-Vaca, Guillermo

Subjects
FUSED deposition modeling, ORGANIC solvents, GRINDING & polishing, AUTOMOBILE industry, SURFACE finishing, POLYSTYRENE, SURFACE roughness, ACRYLONITRILE
Abstract

Metal molds have traditionally been used in the manufacture of polyurethane foam parts. This type of molds presents several disadvantages: have a high cost; need a long time for their manufacture; involve the use of release agents during the demolding operation. As an alternative, the use of molds manufactured by fused deposition modeling is proposed. These 3D printed molds have a poor surface finish, which complicates the demolding operation. To overcome this handicap, materials that can be chemically polished have been studied: acrylonitrile butadiene styrene and high impact polystyrene. Acrylonitrile butadiene styrene can be polished by exposure to acetone vapors and high impact polystyrene by immersion in limonene. This post-processing operation allows to reduce the surface roughness of the 3D printed mold. To simulate the industrial use of the mold, seven molding-demolding cycles have been performed. To measure the ease of demolding of each material, a pull-off test has been used. The results indicate that high impact polystyrene has less affinity with polyurethane foam than acrylonitrile butadiene styrene. In addition, although release agent is used in cycle 1, with high impact polystyrene specimens, it is not necessary to use it in cycles 2, 3 and 4; this means a saving of release agent. Furthermore, the chemical polishing of high impact polystyrene by immersion in limonene has several advantages: it is performed in a short time; it allows to obtain an excellent finish regardless of the initial surface roughness; it is done using a biodegradable solvent of organic origin. To experimentally demonstrate the viability of the proposed solution, a mold for the back of a car seat has been printed in high impact polystyrene via fused deposition modeling and chemically polished by immersion in limonene (1 min); the geometrical deviations generated were less than 1 mm. [ABSTRACT FROM AUTHOR]

Published
2021
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14. LARGE SIGNED SUBSET SUMS

Author

Ambrus, Gergely and González Merino, Bernardo

Abstract

We study the following question: for given d⩾2, n⩾dand k⩽n, what is the largest value c(d,n,k)such that from any set of nunit vectors in Rd, we may select kvectors with corresponding signs ±1 so that their signed sum has norm at least c(d,n,k)? The problem is dual to classical vector sum minimization and balancing questions, which have been studied for over a century. We give asymptotically sharp estimates for c(d,n,k)in the general case. In several special cases, we provide stronger estimates: the quantity c(d,n,n)corresponds to the ℓp‐polarization problem, while determining c(d,n,2)is equivalent to estimating the coherence of a vector system, which is a special case of p‐frame energies. Two new proofs are presented for the classical Welch bound when n=d+1. For large values of n, volumetric estimates are applied for obtaining fine estimates on c(d,n,2). Studying the planar case, sharp bounds on c(2,n,k)are given. Finally, we determine the exact value of c(d,d+1,d+1)under some extra assumptions.

Published
2021
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15. Experimental validation of the seismic analysis methodology for free-standing spent fuel racks

Author

González Merino, Alberto, Costas de la Peña, Luis, and González, Arturo

Abstract

Spent fuel racks are steel structures used in the storage of the spent fuel removed from the nuclear power reactor. Rack units are submerged in the depths of the spent fuel pool to keep the fuel cool. Their free-standing design isolates their bases from the pool floor reducing structural stresses in case of seismic event. However, these singular features complicate their seismic analysis which involves a transient dynamic response with geometrical nonlinearities and fluid-structure interactions. An accurate estimation of the response is essential to achieve a safe pool layout and a reliable structural design. An analysis methodology based on the hydrodynamic mass concept and implicit integration algorithms was developed ad-hoc, but some dispersion of results still remains. In order to validate the analysis methodology, vibration tests are carried out on a reduced scale mock-up of a 2-rack system. The two rack mockups are submerged in free-standing conditions inside a rigid pool tank loaded with fake fuel assemblies and subjected to accelerations on a unidirectional shaking table. This article compares the experimental data with the numerical outputs of a finite element model built in ANSYS Mechanical. The in-phase motion of both units is highlighted and the water coupling effect is detailed. Results show a good agreement validating the methodology.

Published
2019
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16. Sources of uncertainty in the seismic design of submerged free-standing racks.

Author

González Merino, Alberto, Costas de la Peña, Luis, and González, Arturo

Abstract

Free-standing racks are 5 m tall structures that store spent fuel removed from the nuclear power reactor on the depths of a spent fuel pool. Rack units are arranged on the floor of this 12 meters deep pool separated by only a few centimeters. Their response to an earthquake event is a troubling safety issue as they are in submerged and free-standing conditions. Such a seismic analysis deals with a highly nonlinear behavior, a transient dynamic response and a fluid-structure interaction problem. To overcome these difficulties in a cost-effective manner, the current analysis methodology implements the hydrodynamic mass concept in commercial finite element analysis software. However, some dispersion of results still exists in the application of this ad-hoc methodology. This paper reviews the seven major sources of uncertainty inherent to the current analysis methodology together with the main challenges of the seismic analysis. [ABSTRACT FROM AUTHOR]

Published
2017
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17. A GENERALIZATION OF THE DISCRETE VERSION OF MINKOWSKI’S FUNDAMENTAL THEOREM

Author

González Merino, Bernardo and Henze, Matthias

Abstract

One of the most fruitful results from Minkowski’s geometric viewpoint on number theory is his so-called first fundamental theorem. It provides an optimal upper bound for the volume of a $0$-symmetric convex body whose only interior lattice point is the origin. Minkowski also obtained a discrete analog by proving optimal upper bounds on the number of lattice points in the boundary of such convex bodies. Whereas the volume inequality has been generalized to any number of interior lattice points already by van der Corput in the 1930s, a corresponding result for the discrete case remained to be proven. Our main contribution is a corresponding optimal relation between the number of boundary and interior lattice points of a $0$-symmetric convex body. The proof relies on a congruence argument and a difference set estimate from additive combinatorics.

Published
2016
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