7,086 research outputs found
Modelling the squeeze flow in a deformed rectangular microchannel
Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.Rheinforce cork composites, previously named elsewhere as CorkSTFluidics [1], are sandwiches consis?ng of two microagglomerated cork pads embedding microfluidic
paCerns that are filled with a shear thickening fluid (see Figure 1 (a)), whose mechanical performance under impact loads is determined by the microfluidic paCern and the
rheological proper?es of the fluid [2]. From the experimental results it is impossible to decouple the fluid contribu?on from the solid contribu?on to the force?me response
of the composite. In this work, we have developed a simple model of the fluid-flow dynamics that it is able to predict the fluid contribu?on in the energy dissipa?on of the
Rheinforce cork composites under impact loads. To that end, we model the viscous flow inside a microchannel for a known displacement of the upper lid h(t, x), calcula?ng
as a result the needed force to create that movement
At-sea abundance and distribution of skuas and jaegers (Charadriiformes: Stercorariidae) at coastal waters off central Chile
Indexación: Web of Science; Scielo.BACKGROUND: Skuas and jaegers (Charadriiformes: Stercorariidae) are seabirds breeding at moderate to high latitudes and some perform extensive post-breeding transequatorial migrations. Most species overwinter and perform significant portions of their migratory flyways along the Pacific coast of South America, but scant information is available on their at-sea ecology in this waters. Our aims in this study were to determine: 1) the timing of occurrence and fluctuations in abundance of skua and jaeger species, 2) their spatial distribution within the coastal zone and 3) at-sea behavior of birds, including flock size and interactions with other seabird species.
RESULTS: Between July 2006 and October 2013, we conducted at-sea bird counts at Valparaiso Bay (33°S) in central Chile and confirmed the occurrence of Chilean skuas (Stercorarius chilensis), Brown skuas (S. antarcticus), and Parasitic jaegers (S. parasiticus). Parasitic jaegers are regular austral summer visitors (November to March), whereas Brown skuas occur in the area only in winter (July to October). Chilean skuas were regularly recorded year-round in the area with higher abundances between late winter and early spring (August to October). Brown and Chilean skuas where observed comparatively offshore, whereas Jaegers presented a more coastal distribution, probably associated to host presence. Chilean skuas kleptoparasitized similar-sized (shearwaters and fulmars) and larger seabird species (boobies), whereas jaegers chased only smaller coastal birds (gulls and terns). Brown skuas engaged in no kleptoparasitic behaviors. All three species were observed mostly as solitary individuals.
CONCLUSIONS: Skuas and jaegers showed in general a marked seasonality in their occurrence and abundance (only Chilean skua occurs year-round) and use this area as a commuting and stopover zone within their extensive migratory flyway along the southeastern Pacific.http://ref.scielo.org/p7thp
El concepto de geosinclinal tras la revolución movilista: otro desajuste entre la ciencia actual y la ciencia en el aula
A revision of Geology and Physical Science textbooks widely used at high-school leve1 shows that the geosyncline idea (in itself or as a part of plate tectonics theory) is frequently presented as a tenable hypothesis on mountain origins. As this is not a scientifically acceptable position any more, a great deal of confusion is probably being created among both students and teachers without very solid geologic foundations
Historia y epistemología de las ciencias: el concepto de geosinclinal tras la revolución movilista: otro desajuste entre la ciencia actual y la ciencia en el aula
Depto. de Mineralogía y PetrologíaFac. de Ciencias GeológicasFALSEpu
The different origins of high- and low-ionization broad emission lines revealed by gravitational microlensing in the Einstein cross
We investigate the kinematics and ionization structure of the broad emission
line region of the gravitationally lensed quasar QSO2237+0305 (the Einstein
cross) using differential microlensing in the high- and low-ionization broad
emission lines. We combine visible and near-infrared spectra of the four images
of the lensed quasar and detect a large-amplitude microlensing effect
distorting the high-ionization CIV and low-ionization H line profiles
in image A. While microlensing only magnifies the red wing of the Balmer line,
it symmetrically magnifies the wings of the CIV emission line. Given that the
same microlensing pattern magnifies both the high- and low-ionization broad
emission line regions, these dissimilar distortions of the line profiles
suggest that the high- and low-ionization regions are governed by different
kinematics. Since this quasar is likely viewed at intermediate inclination, we
argue that the differential magnification of the blue and red wings of
H favors a flattened, virialized, low-ionization region whereas the
symmetric microlensing effect measured in CIV can be reproduced by an emission
line formed in a polar wind, without the need of fine-tuned caustic
configurations.Comment: 11 pages, 4 figures, A&
Real estate acquisition: real estate issues in couples
En la situación actual el acceso a la vivienda resulta más que complicado. Si además se convierte en la morada permanente y estable de la familia, la renuncia, privación o reparto de la vivienda familiar pasa a ser el foco de atención de la pareja cuando su relación entra en crisis. Con el presente trabajo pretendemos aclarar los recientes criterios jurisprudenciales a la hora de asignar la vivienda tras la ruptura del matrimonio o de la convivencia de hecho, así como la utilización de la sociedad civil y la comunidad de bienes como recursos jurídicos utilizables para compartir la titularidad de la vivienda de los convivientes no casados.It is being more difficult nowadays to purchase real estate.
Furthermore, if it became the permanent and loving family home,
abandonment, deprivation or division of the marital residence could be the
focus of a battle for possession in the couple when they decide to end
their relationship. This research paper hereon would through light on what
recent case-law establishes regarding division of the real estate in the
marriage or de facto couple, as well as on the use of community property
as a legal resource in sharing the property in de facto couple cases.Publicad
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