A Theory for the Conformal Factor in Quantum R2R^2 Gravity

A new theory for the conformal factor in R$^2$-gravity is developed. The infrared phase of this theory, which follows from the one-loop renormalization group equations for the whole quantum R$^2$-gravity theory is described. The one-loop effective potential for the conformal factor is found explicitly and a mechanism for inducing Einstein gravity at the minimum of the effective potential for the conformal factor is suggested. A comparison with the effective theory of the conformal factor induced by the conformal anomaly, and also aiming to describe quantum gravity at large distances, is done.Comment: 10 pages, LaTeX file, June 1-199

Differential rotation in fully convective stars

Under the assumption of thermal wind balance and effective entropy mixing in constant rotation surfaces, the isorotational contours of the solar convective zone may be reproduced with great fidelity. Even at this early stage of development, this helioseismology fit may be used to put a lower bound on the midlatitude {\em radial} solar entropy gradient, which in good accord with standard mixing length theory. In this paper, we generalize this solar calculation to fully convective stars (and potentially planets), retaining the assumptions of thermal wind balance and effective entropy mixing in isorotational surfaces. It is found that each isorotation contour is of the form $R^2 = A+B\Phi(r)$, where $R$ is the radius from the rotation axis, $\Phi(r)$ is the (assumed spherical) gravitational potential, and $A$ and $B$ are constant along the contour. This result is applied to simple models of fully convective stars. Both solar-like surface rotation profiles (angular velocity decreasing toward the poles) as well as "antisolar" profiles (angular velocity increasing toward the poles) are modeled; the latter bear some suggestive resemblance to numerical simulations. We also perform exploratory studies of zonal surface flows similar to those seen in Jupiter and Saturn. In addition to providing a practical framework for understanding the results of large scale numerical simulations, our findings may also prove useful in dynamical calculations for which a simple but viable model for the background rotation profile in a convecting fluid is needed. Finally, our work bears directly on an important goal of the CoRoT program: to elucidate the internal structure of rotating, convecting stars.Comment: 21 pages, 20 figures. Accepted for publication in MNRA

Community-driven dispersal in an individual-based predator-prey model

We present a spatial, individual-based predator-prey model in which dispersal is dependent on the local community. We determine species suitability to the biotic conditions of their local environment through a time and space varying fitness measure. Dispersal of individuals to nearby communities occurs whenever their fitness falls below a predefined tolerance threshold. The spatiotemporal dynamics of the model is described in terms of this threshold. We compare this dynamics with the one obtained through density-independent dispersal and find marked differences. In the community-driven scenario, the spatial correlations in the population density do not vary in a linear fashion as we increase the tolerance threshold. Instead we find the system to cross different dynamical regimes as the threshold is raised. Spatial patterns evolve from disordered, to scale-free complex patterns, to finally becoming well-organized domains. This model therefore predicts that natural populations, the dispersal strategies of which are likely to be influenced by their local environment, might be subject to complex spatiotemporal dynamics.Comment: 43 pages, 7 figures, vocabulary modifications, discussion expanded, references added, Ecological Complexity accepte

Cross-talk statistics and impact in interferometric GNSS-R

©2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper presents a statistical analysis of the crosstalk phenomenon in interferometric Global Navigation Satellite Systems Reflectometry (iGNSS-R). Crosstalk occurs when the Delay-Doppler Map (DDM) of a tracked satellite overlaps others fromundesired satellites. This study is performed for ground-based and airborne receivers and for a receiver onboard the International Space Station (ISS) such as the upcoming GNSS Reflectometry, Radio Occultation and Scatterometry onboard ISS experiment. Its impact on ocean altimetry retrievals is analyzed for different antenna arrays. Results show that for elevation angles higher than 60 degrees, crosstalk can be almost permanent from ground, up to 61% from airborne receivers at 2-km height, and up to similar to 10% at the ISS. Crosstalk can only be mitigated using highly directive antennas with narrow beamwidths. Crosstalk impact using a seven-element hexagonal array still induces large errors on ground, but reduces to centimeter level on airborne receivers, and is negligible from the ISS.Peer ReviewedPostprint (author's final draft

The Influence of Blockholders on R&D Investments Intensity: Evidence From Spain

Using data from 3,638 Spanish firms between 1996 and 2000, this article studies the relationship between the presence of large shareholders in the ownership structure of firms and R&D investment. Consistent with our theoretical contention, our results indicate that the impact of large shareholders on the R&D investment is (1) negative when blockholders are banks, (2) positive when blockholders are non-financial corporations, and (3) null when blockholders are individuals. In addition, we find a systematic negative relationship between the number of blockholders and R&D investment. Finally, we extend our study by analyzing the influence that the combined effect between blockholder type and R&D investment has on the firm’s economic performance. Results of this work provide relevant implications for policy makers and academic research.

Using a cognitive architecture to examine what develops

Different theories of development propose alternative mechanisms by which development occurs. Cognitive architectures can be used to examine the influence of each proposed mechanism of development while keeping all other mechanisms constant. An ACT-R computational model that matched adult behavior in solving a 21-block pyramid puzzle was created. The model was modified in three ways that corresponded to mechanisms of development proposed by developmental theories. The results showed that all the modifications (two of capacity and one of strategy choice) could approximate the behavior of 7-year-old children on the task. The strategy-choice modification provided the closest match on the two central measures of task behavior (time taken per layer, r = .99, and construction attempts per layer, r = .73). Modifying cognitive architectures is a fruitful way to compare and test potential developmental mechanisms, and can therefore help in specifying “what develops.

Boletín Informativo del Santuario Eucarístico internacional de San Pascual

Editorial. Magisterio Papal: Homilía del Santo Padre Francisco en su visita pastoral a Asís. El "Cordonet" de Fray Pascual. Cuento en la Navidad pascualina. Efemérides pascualinas: 2 de marzo de 1901. La Santa Sede determina la propiedad y entrega del Cáliz de la Canonización de San Pascual a la comunidad de religiosas clarisas. Otras efemérides. Santos Eucarísticos: Santa María Micaela del Santísimo Sacramento. Reflexiones desde el Evangelio: Viernes, 1 de noviembre de 2013. Solemnidad de Todos los Santos. San Pascual en la cerámica: El retablo cerámico de San Pascual de la Villa de Soneja. San Pascual y los Papas: Papa Gregorio XIII. Vida en el Santuario. Rincón poético: Yo te canto mi poema. XXXV Congreso Eucarístico Internacional de Barcelona: El milagro persistente del Patrono del Congreso o los "golpes" de San Pascual. Colaboraciones: Los tres fuegos de San Pascual Baylón: entre el espíritu y la materia, un simbolismo entrañable. A nuestras Clarisas de San Pascual. Eucaristía y Vida: La celebración de la Eucaristía. Felicitación navideña. Desde el claustro: Un pequeño cuento de Navidad. Mi devoción a San Pascual. Parroquias de San Pascual: Saint-Pascal Paroisse, Créteil (Francia). Florecillas de Santa Clara: Como hijos en torno a la madre. A l'ombra del claustre

An institutional perspective on the impact of recent antibiotic exposure on length of stay and hospital costs for patients with gram-negative sepsis

Carta a Alfonso Sastre Pascual Serrano Pero ¿qué pasa con los intelectuales? (para mi amigo Pascual Serrano) Alfonso Sastre Una reflexión necesaria Pascual Serrano Carta a Alfonso Sastre y a Pascual Serrano, Octavio Rodríguez Araujo. La cobardía de los intelectuales, Carlo Frabetti. Los intelectuales y la apatía, Santiago Alba Ric

Boletín Informativo del Santuario Eucarístico internacional de San Pascual

Audiencia general del Papa Francisco miércoles 8 de noviembre de 2017. Una Navidad especial con San Pascual Baylón en Vila-real. Clausura del año centenario del patronazgo de San Pascual sobre Vila-real. Feliz Navidad desde la clausura. La compañía de San Pascual: de Orito a Vila-real. 65 años del traslado de los restos de San Pascual, desde la Arciprestal a su Santuario. El retablo cerámico de San Pascual, de una colección particular en La Vilavella. XV congreso eucarístico internacional de Angouleme (Francia). Vida en el Santuario. La noche del traslado. Junta pro Santuario de San Pascual Baylón (II). domingo, 03 de diciembre de 2017 primer domingo de adviento. Eucaristía: amor de dios y belleza humana (IX). Crónica del XXXV Congreso Eucarístico Internacional de Barcelona (II). Navidad de San Pascual. Nuevo relicario de San Pascual. San Pascual apóstol y bienhechor de Villarreal IV