Refractive effects in the scattering of loosely bound nuclei

A study of the interaction of loosely bound nuclei 6,7Li at 9 and 19 AMeV with light targets has been undertaken. With the determination of unambiguous optical potentials in mind, elastic data for four projectile-target combinations and one neutron transfer reaction 13C(7Li,8Li)12C have been measured on a large angular range. The kinematical regime encompasses a region where the mean field (optical potential) has a marked variation with mass and energy, but turns out to be sufficiently surface transparent to allow strong refractive effects to be manifested in elastic scattering data at intermediate angles. The identified exotic feature, a "plateau" in the angular distributions at intermediate angles, is fully confirmed in four reaction channels and interpreted as a pre-rainbow oscillation resulting from the interference of the barrier and internal barrier farside scattering subamplitudes.Comment: 19 pages, 14 figures, 3 tables to submit to Phys. Rev.

Technologies in the cruise tourism services: A systematic and bibliometric approach

COVID-19 and the faster evolution of emerging technologies forced companies to create new business models and become more digital. Therefore, companies worldwide have adopted different digital technologies such as online stores, digital assistants, digital panels, or robotic services. This trend has also impacted the cruise industry, with new cruise ships using digital technologies onboard such as: Artificial Intelligence (AI): ⎼ ZOE digital assistance is used in the latest MSC Cruise Ships. ⎼ Virtual Concierge app used on the newest Celebrity Cruises Ships. ⎼ Robotic bartender at the Bionic Bar on Royal Caribbean Cruise Lines. ⎼ Pepper, the humanoid robot at Costa Cruise Line ships. ⎼ Rob the first humanoid robot bartender at MSC Cruise ships. Virtual Reality (VR): ⎼ Shore excursions ⎼ Culinary dining Despite the strong adoption of new technologies in cruise ships, existing studies related to the use of AI, VR, or robots in smart tourism are mostly limited to restaurants, hotels, or airports. Opening an opportunity to develop a systematic and bibliometric review on this topic - Technologies in the cruise tourism services.info:eu-repo/semantics/publishedVersio

Flora vascular y conexiones fitogeográficas de las montañas Carabaya, Perú

Studies of floristic composition and plant species richness in tropical mountains support their recognition as areas of high biological diversity, and therefore of their importance for plant conservation. Here, we present data on the flora of the high Andes of eight sites centered in the Carabaya mountains, and also provide a floristic comparison with nine other floras within Peru and northern Bolivia. The study area includes 506 species of vascular plants, grouped in 203 genera and 66 families. The highest species richness was found in two families: Asteraceae and Poaceae, which collectively encompass 37% of all species. Other important families were Caryophyllaceae, Fabaceae, Malvaceae, Brassicaceae, Caprifoliaceae, Gentianaceae, Plantaginaceae and Cyperaceae. The most diverse genera were Senecio, Calamagrostis, Poa and Nototriche. Perennial herbs were the dominant growth form. The vascular flora of the Carabaya Mountains is closely related to those of other regions of southern Peru. Also, more than half of all vascular plants registered for the Carabaya Mountain occur in the Andean region of Bolivia, which shows the undoubted geophysical and phytogeographical connection of the Carabaya and the Bolivian Apolobamba Mountains. This study also shows that there is still a need for more extensive plant collecting and future exploration, since the Carabaya, as other parts of Peru’s high Andes are subject of dramatic change that may threaten these plant populations.Los estudios sobre la composición florística y riqueza de especies en montañas tropicales apoyan su reconocimiento como áreas de alta diversidad biológica, y, por tanto, de su importancia para la conservación. En este trabajo presentamos datos sobre la flora altoandina de ocho sitios localizados en la Cordillera de Carabaya, proveemos también una comparación florística con otros nueve lugares tanto en Perú como en el norte de Bolivia. El área de estudio incluye 506 especies de plantas vasculares, reconocidas en 203 géneros y 66 familias. Las tasas más altas de riqueza de especies se hallan en dos familias: Asteraceae y Poaceae, que colectivamente abarcan el 37% de todas las especies. Otras familias importantes fueron Caryophyllaceae, Fabaceae, Malvaceae, Brassicaceae, Caprifoliaceae, Gentianaceae, Plantaginaceae y Cyperaceae. Los géneros más diversos fueron Senecio, Calamagrostis, Poa y Nototriche. La forma de crecimiento predominante fueron las hierbas perennes. La flora vascular de la Cordillera Carabaya está muy relacionada con otras regiones del sur de Perú. Además, más de la mitad de todas las plantas vasculares registradas para la Cordillera Carabaya se encuentran en la región andina de Bolivia, lo que demuestra la indudable conexión geofísica y fitogeográfica entre las cordilleras Carabaya y Apolobamba de Bolivia. Este estudio también demuestra la necesidad de una extensa colección botánica y futura exploración, desde que Carabaya, como otras partes de los altos Andes del Perú, están sujetos a cambios dramáticos que amenazan las poblaciones de esas plantas

Disminución en los parámetros espermáticos de ratones tratados con el extracto hidroalcohólico de Tropaeolum tuberosum “mashua”

In this work, we provided a Tropaeolum tuberosum hydroalcoholic extract to male mice (780 mg kg-1) for 7, 14 and 21 days treatment, there was no significant difference in body weight gain, testes, epididymides and prostate weight (p> 0.05), nevertheless progressive motility decreased and immobile sperm count increased significantly after 21 days treatment (p <0.05). The sperm count in the epididymis cauda decreased in the 3 three assessments, concentration on 21 days treatment was significantly lower than those of 7 and 14 days treatments (p <0.05). Our results suggest, that T. tuberosum has a direct action on the male reproductive system decreasing spermatic parameters without exerting toxic effects on mice.Se proporcionó extracto hidroalcohólico de Tropaeolum tuberosum a ratones machos (780 mg kg-1) durante 7, 14 y 21 días. Los tratamientos no produjeron diferencias significativas en la ganancia de peso corporal, y en el peso de los testículos, epidídimos y la próstata. Sin embargo, la movilidad progresiva espermática disminuyó y el recuento de espermatozoides inmóviles aumentó, ambos significativamente, después de 21 días de tratamiento (p <0.05). La concentración de espermatozoides en la cola del epidídimo disminuyó en las tres evaluaciones, la concentración espermática después de 21 días de tratamiento fue significativamente menor en comparación a 7 y 14 días de tratamiento (p <0.05). Nuestros resultados sugieren que T. tuberosum tiene una acción directa sobre el sistema reproductor masculino disminuyendo los parámetros espermáticos, sin ejercer efectos tóxicos en los ratones

Coherent states for a particle on a sphere

The coherent states for a particle on a sphere are introduced. These states are labelled by points of the classical phase space, that is the position on the sphere and the angular momentum of a particle. As with the coherent states for a particle on a circle discussed in Kowalski K {\em et al} 1996 {\em J. Phys. A} {\bf 29} 4149, we deal with a deformation of the classical phase space related with quantum fluctuations. The expectation values of the position and the angular momentum in the coherent states are regarded as the best possible approximation of the classical phase space. The correctness of the introduced coherent states is illustrated by an example of the rotator.Comment: LaTeX, 16 pages, 2 figure

Tipos de lesiones de Piricularia en trigo.

bitstream/item/144811/1/ID43672-2016CTO355.pd

Dark Energy in an Axion Model with Explicit Z(N) Symmetry Breaking

We point out that a well known axion model with an explicit Z(N) symmetry breaking term predicts both dark energy and cold dark matter. We estimate the parameters of this model which fit the observed densities of the dark components of the universe. We find that the parameters do not conflict with any observations.Comment: 5 pages, minor change