Probing the ZZgamma and Zgammagamma Couplings Through the Process e+e- --> nu anti-nu gamma

We study the sensitivity for testing the anomalous triple gauge couplings $ZZ\gamma$ and $Z\gamma\gamma$ via the process $e^+e^-\to \nu \bar\nu \gamma$ at high energy linear colliders. For integrated luminosities of 500 $fb^{-1}$ and center of mass energies between 0.5 and 1.5 $TeV$, we find that this process can provide tests of the triple neutral gauge boson couplings of order $10^{-4}$, one order of magnitude lower than the standard model prediction.Comment: 12 pages, 6 figure

High-order harmonic generation at high laser intensities beyond the tunnel regime

We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in the turn-on stage. Our results predict an increasing on the harmonic yield, after an initial dropping, when the laser intensity is increased. This fact contradicts the general belief of a progressive degradation of the harmonic emission at ultrahigh intensities. We have identified a particular set of trajectories which emerges in the turn-on stage of these singular laser pulses, responsible of the unexpected growth on the harmonic efficiency at this high intensity regime. Our study combines two complementary approaches: classical analysis and full quantum mechanical calculations resulting from the numerical integration of the 3-dimensional time-dependent Schr\"odinger equation complemented with the time-frequency analysis

Un currículo para el estudio de la historia de la ciencia en Secundaria : la experiencia del Seminario Orotava de Historia de la Ciencia

The curricula of two disciplines on History of Science at the High School level have been elaborated as part of the activities of a singular experience, Seminario Orotava de Historia de la Ciencia. The philosophy of the design considers science as an essential part of culture and interdisciplinarity as the most fitted method of teaching and learnign in a significative way

La investigación como soporte de la gestión: el ejemplo de la duna costera (foredune) de Maspalomas (Gran Canaria, Islas Canarias)

Se analizan las transformaciones experimentadas en las últimas décadas por la duna costera (foredune) de Maspalomas, un proceso que coincide con el descenso de las poblaciones del arbusto Traganum moquinii. Los resultados obtenidos indican que esas poblaciones han experimentado una reducción muy significativa entre 1961 y 2003, lo que ha producido la fragmentación de la duna costera y la generación de superficies de deflación. A partir de estos resultados se han propuesto una serie de actuaciones encaminadas a recuperar la duna costera, mediante la eliminación de las actividades humanas perjudiciales para la vegetación y la repoblación con ejemplares de Traganum moquinii.We analyze the changes experienced by the foredune of the dunes field of Maspalomas in recent decades, a stage that coinciding with the decline in populations of bush Traganum moquinii. The results showed that populations of Traganum moquinii have experienced a very significant reduction between 1961 and 2003, with the result of the fragmentation of coastal dune and generating deflation surfaces. Based on these results, some actions have been proposed, aimed at recovering the coastal dune, by eliminating human activities detrimental to vegetation and restocking with copies of Traganum moquinii

High-order harmonic generation driven by chirped laser pulses induced by linear and non linear phenomena

We present a theoretical study of high-order harmonic generation (HHG) driven by ultrashort optical pulses with different kind of chirps. The goal of the present work is perform a detailed study to clarify the relevant parameters in the chirped pulses to achieve a noticeable cut-off extensions in HHG. These chirped pulses are generated using both linear and nonlinear dispersive media.The description of the origin of the physical mechanisms responsible of this extension is, however, not usually reported with enough detail in the literature. The study of the behaviour of the harmonic cut-off with these kind of pulses is carried out in the classical context, by the integration of the Newton-Lorentz equation complemented with the quantum approach, based on the integration of the time dependent Schr\"odinger equation in full dimensions (TDSE-3D), we are able to understand the underlying physics.Comment: 13 pages, 8 figure

Double-electron ionization driven by inhomogeneous fields

Authors may self-archive the author’s accepted manuscript of their articles on their own websites. Authors may also deposit this version of the article in any repository, provided it is only made publicly available 12 months after official publication or later. He/ she may not use the publisher's version (the final article), which is posted on SpringerLink and other Springer websites, for the purpose of self-archiving or deposit. Furthermore, the author may only post his/her version provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be provided by inserting the DOI number of the article in the following sentence: “The final publication is available at Springer via https://link.springer.com/article/10.1007/s00340-017-6672-4"Electron–electron correlation effects play a crucial role in our understanding of sequential (SDI) and non-sequential double ionization (NSDI) mechanisms. Here, we present a theoretical study of NSDI driven by plasmonic-enhanced spatial inhomogeneous fields. By numerically solving the time-dependent Schrödinger equation for a linear reduced model of He and a double-electron time-evolution probability analysis, we provide evidence for enhancement effects in NSDI showing that the double ionization yield at lower laser peak intensities is increased due to the spatial inhomogeneous character of plasmonic-enhanced field. The change in the emission direction of the double-ion as a function of the field inhomogeneity degree demonstrates that plasmonic-enhanced fields could configure a reliable instrument to control the ion emission. Furthermore, our quantum mechanical model, as well as classical trajectory Monte Carlo simulations, show that inhomogeneous fields are as well as a useful tool for splitting the binary and recoil processes in the rescattering scenario.This work was supported by the project ELI-Extreme Light Infrastructure-phase 2 (Project No. CZ.02.1.01/0.0/0.0/ 15_008/0000162) from European Regional Development Fund, Spanish MINECO (National Plan grants FIS2011-30465-C02-01, FOQUS No. FIS2013-46768-P, FISICATEAMO FIS2016-79508-P and Severo Ochoa Excellence Grant No. SEV-2015-0522), the Generalitat de Catalunya (SGR 874 and CERCA/Program) and Fundació Privada Cellex Barcelona. N.S. was supported by the Erasmus Mundus Doctorate Program Europhotonics (Grant No. 159224-1-2009-1-FR-ERA MUNDUS-EMJD). N.S., A.C., and M.L. acknowledge ERC AdG OSYRIS, EU FETPRO QUIC and National Science Centre, Poland—Symfonia Grant 2016/20/W/ST4/00314. A. S. L. acknowledges Max Planck Center for Attosecond Science (MPC-AS). J. A. P.-H. acknowledges to the Spanish Ministerio de Economía y Competitivi- dad (FURIAM Project No. FIS2013-47741-R and PALMA project FIS2016- 81056-R) and Laserlab-Europe (EU-H2020 654148). L.O. acknowledges valuable input from Andre Staudte. The authors thankfully acknowledge the computer resources at MareNostrum, technical expertise and assistance provided by the Barcelona Supercomputing Center and the Red Española de Supercomputación (RES)Peer ReviewedPostprint (author's final draft

A catalog of planetary nebula candidates in the Sculptor spiral galaxy NGC 300

[OIII]5007 on-band off-band images, obtained with the VLT and FORS2 spectrograph in two zones (center and outskirts) of the spiral galaxy NGC300, are analyzed searching for emission line objects. In particular we search for planetary nebula (PN) candidates to analyze their distribution and luminosity properties, to perform follow-up spectroscopy, and to study the planetary nebula luminosity function, PNLF. In the continuum-subtracted images, a large number of emission line objects were detected. From this sample we selected as PN candidates those objects with stellar appearance and no detectable central star. [OIII]5007 instrumental magnitudes were measured and calibrated by using spectrophotometric data from the follow-up spectroscopy. We identified more than a hundred PN candidates and a number of compact HII regions. The PN sample is the largest one reported for this galaxy so far. For all the objects we present coordinates, instrumental [OIII]5007 magnitudes and apparent nebular [OIII]5007 fluxes and magnitudes. The [OIII]5007 observed luminosity function for PNe (PNLF) was calculated for the whole sample and for the central and outskirts samples. The three PNLF are similar within uncertainties. We fit the empirical PNLF to the observed PNLF for all the samples. From our best fit for the whole sample we derived a maximum value for the apparent magnitudes of m*(5007)=22.019\pm0.022 and we obtained a tentative estimate of the distance modulus m(5007)-M(5007)= 26.29 {+0.12} {-0.22} mag, which agrees well with the recent value derived from Cepheid stars.Comment: 8 pages, 3 figures, one long table. Accepted by A&

Effect of feed evaluation system on the cost of rations for dairy cows

El objetivo del presente trabajo fue comparar la valoración de las necesidades y los aportes de energía calculados según sistemas históricos y modernos de alimentación para vacas lecheras -unidades alimenticias escandinavas (UA), energía neta grasa (ROSTOCK), energía metabolizable (MAFF), energía neta de lactación (NRC) y unidades forrajeras leche (INRA)- con el fin de investigar la repercusión de aquella en el coste de la ración diaria. Las necesidades energéticas se expresaron como energía neta de lactación (ENL) y se calcularon a intervalos de 30 días en leche (DEL) para una vaca Holstein adulta de 680 kg de peso vivo con una producción de 10000 kg de leche en 305 días y un intervalo entre partos de un año. El aporte de ENL según cada sistema se calculó a partir de diez raciones optimizadas con el programa CPMDairy 1.0 para satisfacer las necesidades nutritivas de la vaca modelo cada 30 DEL. Exceptuando los valores obtenidos con el sistema de unidades alimenticias y el comienzo inmediato de la lactación, las diferencias entre las necesidades de ENL calculadas según los distintos sistemas fueron relativamente bajas (entre 1,1 y 7,5%) y achacables fundamentalmente a la valoración energética del cambio de peso. El aporte calculado de energía mostró diferencias importantes entre los sistemas, oscilando de 19,1 a 25,2%. A lo largo de la lactación, los aportes calculados fueron inferiores a las necesidades en todos los sistemas, con la excepción de NRC y MAFF a 30 y 270 DEL, respectivamente, y UA desde 90 DEL. La diferencia promedio estuvo comprendida entre -1,4 ± 1,1 Mcal d-1 (4,5 ± 2,9%; MAFF) y -5,5 ± 1,7 Mcal d-1 (15,6 ± 4,5%; INRA). El coste unitario de la Mcal varió notablemente entre sistemas (de 18,7 a 25,5%) al igual que el coste de satisfacer los requerimientos diarios de energía (de 13,5 a 50,2%). Se concluyó que, independientemente de cual sea la precisión real, el sistema de valoración de energía empleado en la formulación tiene una importante repercusión sobre el coste de las raciones para vacas lecherasThe objective of the present work was to compare energy requirements and supply calculated according to old and modern feed evaluation systems for dairy cattle - Scandinavian feed units (UA), net energy fat (ROSTOCK), metabolizable energy (MAFF), net energy of lactation (NRC) and milk fodder units (INRA) - to assess the differences in the cost of the ration. The energy requirements were expressed as net energy of lactation (NEL) and were calculated every 30 days in milk (DIM) for a mature Holstein cow weighing 680 kg, producing 10000 kg of milk in 305 days, and calving every year. Ten rations optimized with CPM-Dairy 1.0 to satisfy the nutritional requirements of the model cow every 30 DIM were used to compare the calculated NEL supply according to the systems being evaluated. Except for the values obtained according to the feed units system and the onset of lactation, the differences between the systems in the calculated energy requirements were relatively low (from 1.1% to 7.5%) and mainly attributable to the energy value assigned to the live weight change. The differences between the systems in the NEL supply of the rations were high and oscillated between 19.1% and 25.2%. The calculated supplies were smaller than the requirements in all the systems throughout lactation, except for UA from 90 DIM and NRC and MAFF at 30 and 270 DIM, respectively. The average differences were in the range from -1.4 ± 1.1 Mcal d-1 (4.5 ± 2.9%; MAFF) to -5.5 ± 1.7 Mcal d-1 (15.6 ± 4.5%; INRA). The cost of the Mcal differed between the systems (from 18.7% to 25.5%) and the same was true for the cost of satisfying the daily energy requirements (from 13.5% to 50.2%). It was concluded that, without taking into account the real accuracy, the energy evaluation system used in the formulation affects considerably the cost of rations for lactating dairy cattle