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showing 10 items of 401 documents
Search for new phenomena in final states with large jet multiplicities and missing transverse momentum at s√=8 TeV proton-proton collisions using the…
2013
A search is presented for new particles decaying to large numbers (7 or more) of jets, with missing transverse momentum and no isolated electrons or muons. This analysis uses 20.3 fb[superscript −1] of pp collision data at s√ = 8 TeV collected by the ATLAS experiment at the Large Hadron Collider. The sensitivity of the search is enhanced by considering the number of b-tagged jets and the scalar sum of masses of large-radius jets in an event. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of various simplified supersymmetry-inspired models where gluinos are pair produced, as well as an mSUGRA/CMSSM model.
Simulation-based marginal likelihood for cluster strong lensing cosmology
2015
Comparisons between observed and predicted strong lensing properties of galaxy clusters have been routinely used to claim either tension or consistency with $\Lambda$CDM cosmology. However, standard approaches to such cosmological tests are unable to quantify the preference for one cosmology over another. We advocate approximating the relevant Bayes factor using a marginal likelihood that is based on the following summary statistic: the posterior probability distribution function for the parameters of the scaling relation between Einstein radii and cluster mass, $\alpha$ and $\beta$. We demonstrate, for the first time, a method of estimating the marginal likelihood using the X-ray selected …
El registro fósil de vertebrados y patrimonio paleontológico más representativo de los pirineos occidentales
2019
Los Pirineos occidentales son un territorio con una notable diversidad geológica y un importante registro fósil, que constituye un gran archivo de paleobiodiversidad. En lo que respecta al registro fósil de vertebrados, los Pirineos occidentales (Región Vasco-Cantábrica, Cuenca de Pamplona y sector noroccidental de la Cuenca del Ebro) son relevantes tanto desde el punto de vista de los yacimientos paleontológicos como de las colecciones de fósiles procedentes de ellos. Varios yacimientos de vertebrados forman parte del Inventario de Lugares de Interés Geológico (LIG) con alto o muy alto interés paleontológico en la Comunidad Autónoma del País Vasco. Destacan los yacimientos de peces cretáci…
Spatial modulation of the electromagnetic energy transfer by excitation of graphene waveguide surface plasmons
2019
We theoretically study the electromagnetic energy transfer between donor and acceptor molecules near a graphene waveguide (WG). The surface plasmons (SPs) supported by the structure provide decay channels which lead to an improvement in the energy transfer rate when the donor and acceptor are localized on the same side or even on opposite sides of the WG. The modification of the energy transfer rate compared to its value in absence of the WG are calculated by deforming the integration path into a suitable path in the complex plane. Our results show that this modification is dramatically enhanced when the symmetric and antisymmetric SPs are excited. Notable effects on the spatial dependence …
Geometric inequivalence of metric and Palatini formulations of General Relativity
2020
Projective invariance is a symmetry of the Palatini version of General Relativity which is not present in the metric formulation. The fact that the Riemann tensor changes nontrivially under projective transformations implies that, unlike in the usual metric approach, in the Palatini formulation this tensor is subject to a gauge freedom, which allows some ambiguities even in its scalar contractions. In this sense, we show that for the Schwarzschild solution there exists a projective gauge in which the (affine) Kretschmann scalar, K≡R R , can be set to vanish everywhere. This puts forward that the divergence of curvature scalars may, in some cases, be avoided by a gauge transformation of the …
Nutritional status, physical performance and disability in the elderly of the Peruvian Andes
2016
Background: Although nutritional status plays an important part in the physical performance and disability of older people, this relationship has been little studied in developing countries. Aims: A study on the effects of nutritional status on the physical performance and functional status of elderly people living in rural areas of the Peruvian Andes. Methods: The study concerned 222 people aged ≥65 years living in a rural area of the Peruvian Andes. The Mini-Nutritional Assessment (MNA) was used to classify participants as malnourished (MNA <= 17), at risk of malnutrition (MNA 18-23), or well-nourished (MNA>= 24). The short physical performance battery (SPPB) and six-minute walking …
Psychosocial risks at work and occupational health
2012
Los cambios que han ocurrido en las últimas décadas sobre los procesos laborales y el diseño del trabajo son de carácter sociodemográfico, económico, político, y tecnológico. Estos cambios han originado nuevos riesgos psicosociales en el trabajo que afectan a la salud y la calidad de vida laboral, pues incrementan los niveles de estrés de los trabajadores. El objetivo del estudio es presentar este tipo de riesgos, sus consecuencias, y algunas recomendaciones para promover la salud en el trabajo como estrategia para mejorar la salud pública de la población. El estudio se estructura en cinco puntos en los que: (1) se presenta el concepto de factores y riesgos psicosociales en el trabajo, (2) …
Active Site Mapping of Xylan-Deconstructing Enzymes with Arabinoxylan Oligosaccharides Produced by Automated Glycan Assembly
2017
Xylan-degrading enzymes are crucial for the deconstruction of hemicellulosic biomass, making the hydrolysis products available for various industrial applications such as the production of biofuel. To determine the substrate specificities of these enzymes, we prepared a collection of complex xylan oligosaccharides by automated glycan assembly. Seven differentially protected building blocks provided the basis for the modular assembly of 2-substituted, 3-substituted, and 2-/3-substituted arabino- and glucuronoxylan oligosaccharides. Elongation of the xylan backbone relied on iterative additions of C4-fluorenylmethoxylcarbonyl (Fmoc) protected xylose building blocks to a linker-functionalized …
Aspirações vitais e sua relação com a paixão, em atletas argentinos selecionados para os Jogos Olímpicos da Juventude
2018
El objetivo de este trabajo fue estudiar las aspiraciones vitales de deportistas adolescentes de alto rendimiento y su relación con la pasión que tienen con respecto a su deporte. Participaron 234 deportistas argentinos (47,9 % varones; 52,1 % mujeres) de entre 12 y 16 años de edad (M = 14,48; DT = 1,09) pertenecientes al Plan de Desarrollo de los Juegos Olímpicos de la Juventud (Buenos Aires, 2018), quienes respondieron un cuestionario sociodemográfico, el Inventario de Aspiraciones vitales y la Escala de Pasión. Los varones obtuvieron puntajes significativamente más altos que las mujeres en las aspiraciones de riqueza y fama, así como también en pasión obsesiva. Para los varones, el creci…
Thomas Hobbes: la resistencia política al Leviatán
2013
En el presente artículo se presentan cuatro claves de lectura de la obra de Thomas Hobbes desde las que fundamentar una noción de resistencia. Este aporte busca, en otras palabras, crear las condiciones de posibilidad de un debate filosófico ofuscado por el mito recurrente sobre el supuesto monstruo de Malmesbury. Una vez hecho esto, se propone delinear las bases de un enfoque metodológico que parta de dicha noción de resistencia. De ese modo, se fundamentaría el primer paso hacia una apropiación (o expropiación) contemporánea de la matriz hobbesiana de la relación obediencia-seguridad. This article presents four key of readings about Thomas Hobbes's work, from which it supports a particul…