271 research outputs found
Quantum state of the multiverse
A third quantization formalism is applied to a simplified multiverse
scenario. A well defined quantum state of the multiverse is obtained which
agrees with standard boundary condition proposals. These states are found to be
squeezed, and related to accelerating universes: they share similar properties
to those obtained previously by Grishchuk and Siderov. We also comment on
related works that have criticized the third quantization approach.Comment: 15 pages, 2 figure
Distinctive dielectric properties of nematic liquid crystal dimers
We provide an overview of the effect of the molecular structure on the dielectric properties of dimers exhibiting nematic and twist-bend nematic phases with special focus on how the conformational distribution changes are reflected by the dielectric behaviour. Nematic dimers show distinctive dielectric properties which differ from those of archetypical nematic liquid crystals, as for example, unusual temperature dependence of the static permittivity or dielectric spectra characterised by two low-frequency relaxation processes with correlated strengths. The interpretation of such characteristic behaviour requires that account is taken of the effect of molecular flexibility on the energetically favoured molecular shapes. The anisotropic nematic interactions greatly influence the conformational distribution. Dielectric behaviour can be used to track those conformational changes due to dependence of the averaged molecular dipole moment on the averaged molecular shape. Results for a number of dimers are compared and analysed on the basis of the influence of details of the molecular structure, using a recently developed theory for the dielectric properties of dimers.Postprint (author's final draft
The Role of Sensory Modulation Deficits and Behavioral Symptoms in a Diagnosis for Early Childhood
To contribute to the validation of the sensory and behavioral criteria for Regulation Disorders of Sensory
Processing (RDSP) (DC:0-3R, 2005), this study examined a sample of toddlers in a clinical setting to analyze: (1) the
severity of sensory modulation deficits and the behavioral symptoms of RDSP; (2) the associations between sensory and behavioral symptoms; and (3) the specific role of
sensory modulation deficits in an RDSP diagnosis. Based on clinical observations, 78 toddlers were classified into
two groups: toddlers with RDSP (N = 18) and those with‘‘other diagnoses in Axis I/II of the DC:0-3R’’ (OD3R; N = 60). The parents completed the Infant Toddler Sensory
Profile and the Achenbach Checklist. The results revealed that the RDSP group had more severe sensory modulation deficits and specific behavioral symptoms; stronger, although not significant, associations between most sensory and behavioral symptoms; and a significant sensory modulation deficit effect. These findings support the validity of RDSP
A dark energy multiverse
We present cosmic solutions corresponding to universes filled with dark and
phantom energy, all having a negative cosmological constant. All such solutions
contain infinite singularities, successively and equally distributed along
time, which can be either big bang/crunchs or big rips singularities.
Classicaly these solutions can be regarded as associated with multiverse
scenarios, being those corresponding to phantom energy that may describe the
current accelerating universe
Vulnerability and resilience of high-mountain pine forests of the Gredos range (Ávila, Spanish Central System): two thousand years of socio-ecological dynamics
RESUMEN: En este trabajo se presenta el análisis palinológico de la turbera de Pozo de la Nieve, localizada en el Parque Natural del Valle de Iruelas (Ávila), un área de alto valor sociocultural dentro de la Sierra de Gredos (Sistema Central). Con el objetivo de relacionar los cambios en el paisaje con la explotación de los recursos naturales y eventos climáticos, en primer lugar se han realizado 7 dataciones radiocarbónicas que sitúan el inicio del registro sedimentario ca. 240 cal BC. Los datos polínicos indican la existencia de un denso pinar altimontano dominado por Pinus sylvestris/nigra desde la Segunda Edad de Hierro hasta el periodo islámico. A partir del periodo cristiano las actividades antrópicas se intensifican, especialmente la ganadería en la Edad Contemporánea, lo cual conlleva la progresiva desaparición del pinar de alta montaña y el desarrollo de pastizales mediante el manejo del fuego, situación que culmina con el desarrollo del paisaje actual dominado por piornales pirófilos.ABSTRACT: We present the palynological study of Pozo de la Nieve peat bog, located in a very valuable socio-cultural placement within the Iruelas Valley Natural Park (Gredos range, Iberian Central System). We have focused in relating landscape changes to natural resources management and climatic events. Firstly, we carried out seven radiocarbon dates suggesting the origin of this record ca. 240 cal BC. The palynological data show the existence of dense high-mountain pine woodlands dominated by Pinus sylvestris/nigra from the Late Iron Age to the Muslim period. Later, from the Christian period, anthropogenic activities have intensified, especially livestock grazing in the Contemporary Age. Its consequences are the progressive disappearance of highmountain pine forests and the extension of grasslands by means of fire, which has shaped current landscape dominated by broom communities.Este trabajo ha sido financiado por el proyecto
Desirè-HAR2013-43701-P (Plan Nacional
I+D+I, Ministerio de Economía y Competitividad
de España). Sebastián Pérez Díaz está
financiado por el Programa Estatal de Promoción
del Talento y su Empleabilidad en I+D+i
en la modalidad Juan de la Cierva-Incorporación.
Mónica Ruiz Alonso está financiada por
el Programa Estatal de Promoción del Talento
y su Empleabilidad en I+D+i en la modalidad
Juan de la Cierva-Formación
Early Postoperative Monitoring of the Liver Graft
Liver transplantation (LT) is a common current technique for end-stage liver disease. Complications after the surgical procedure, though uncommon, can be of very different origin and can also be severe enough to lead to liver and multiorgan failure and finally graft loss and/or recipient’s death. Intensivists and the surgical team must be familiarized with these early complications to detect them as soon as possible in order to use the best diagnostic tools and take the best therapeutic measures to restore anatomical integrity and organ function to optimize the liver graft. In this chapter, we present an updated state of the art for efficiently tackling with all different, most usual complications that an LT patient can present during early postoperative period
Eficacia y eficiencia de Leader 11 en Andalucía. Aproximación a un índice-resultado en materia de turismo rural
The evaluation has turned into a strategic element of differentiation, into the measurement into that allows to demonstrate his own beneficiaries, that the application of the public or private resources, it is as suitable as possible. To evaluate is necessary a system of indicators, which answer to five big types of which we will centre on two: efficiency (the effort inverted in terms of plysical, human or financial resources and the obtained results) and effectiveness (the impacts or results of the program with regard to his aims). In this article we try to put of manifest as the evaluation of the measurement B.3 (tourist activities) it allows across the analysis of the efficiency (projects) and the effectiveness (investment) in LEADER 11, one approximation in the construction of a proved index.La evaluación se ha convertido en un elemento estratégico de diferenciación, en la medida en que permite demostrar a sus propios beneficiarios, que la aplicación de los recursos públicos o privados, es la más adecuada posible. Para evaluar los programas de desarrollo rural es necesario un sistema de indicadores, que responden a cinco grandes tipos de los que nos centraremos en dos: eficiencia (el esfuerzo invertido en términos de recursos físicos, humanos o financieros y los resultados obtenidos) y eficacia (los impactos o resultados del programa respecto a sus objetivos). En este articulo tratamos de poner de manifiesto como la evaluación de la medida B.3 (actividades turísticas) permite, a través del análisis de la eficacia (proyectos) y la eficiencia (inversión) en LEADER 11, una primera aproximación en la construcción de un índice resultado
Estrategia y desarrollo del simulador de negocios Capsim
En este trabajo se recopila la experiencia en el simulador de negocios Capsim, en el cual se manejó una empresa de sensores electrónicos. Se supervisó desde su desarrollo hasta la puesta en el mercado y se tomaron decisiones para cada año operativo dentro del simulador. Se trabajó en la administración de las áreas de diseño, investigación, desarrollo, mercadotécnica, producción, recursos humanos y finanzas
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