Studying stellar binary systems with the Laser Interferometer Space Antenna using Delayed Rejection Markov chain Monte Carlo methods

Bayesian analysis of LISA data sets based on Markov chain Monte Carlo methods has been shown to be a challenging problem, in part due to the complicated structure of the likelihood function consisting of several isolated local maxima that dramatically reduces the efficiency of the sampling techniques. Here we introduce a new fully Markovian algorithm, a Delayed Rejection Metropolis-Hastings Markov chain Monte Carlo method, to efficiently explore these kind of structures and we demonstrate its performance on selected LISA data sets containing a known number of stellar-mass binary signals embedded in Gaussian stationary noise.Comment: 12 pages, 4 figures, accepted in CQG (GWDAW-13 proceedings

LISA observations of supermassive black holes: parameter estimation using full post-Newtonian inspiral waveforms

We study parameter estimation of supermassive black hole binary systems in the final stage of inspiral using the full post-Newtonian gravitational waveforms. We restrict our analysis to systems in circular orbit with negligible spins, in the mass range 10^8\Ms-10^5\Ms, and compare the results with those arising from the commonly used restricted post-Newtonian approximation. The conclusions of this work are particularly important with regard to the astrophysical reach of future LISA measurements. Our analysis clearly shows that modeling the inspiral with the full post-Newtonian waveform, not only extends the reach to higher mass systems, but also improves in general the parameter estimation. In particular, there are remarkable improvements in angular resolution and distance measurement for systems with a total mass higher than 5\times10^6\Ms, as well as a large improvement in the mass determination.Comment: Final version. Accepted for publication in Phys. Rev.

Inventario espeleológico de Mallorca

Abstract not availabl

L'Institut Medico Farmacèutic de Barcelona durant el conflicte (1936-1942)

L'objectiu d'aquesta comunicació es donar a conèixer els esdeveniments de l'Institut Medicofarmacèutic de Catalunya durant la Guerra Civil i postguerra (1936-1942). S'assenyalen els antecedents político-socials fins l'any 1945. Es fa referència de la documentació inèdita i dels Llibres d'Actes de l'arxiu d'aquesta Institució. Es fa esment de la seva catalanitat, així com del procés de depuració des de l'any 1939 fins l'any 1942, fet que continuà i que va suposar per a l'Institut Medicofarmacèutic quedar orfe de personalitats científiques de la medicina, de la farmàcia i de la veterinària, entre altres, a causa de l'exili, de la depuració, dels desapareguts i morts en guerra

Symbol and logo of Barcelona'92 Olympic Games

This text has been published in the book Jocs Olímpics, comunicació i intercanvis culturals: l'experiència dels últims quatre Jocs Olímpics d'estiu, gathering the communications presented in the international Symposium that was celebrated in Barcelona from 3 to 5 april of 1991.Este texto ha sido publicado en el libro Jocs Olímpics, comunicació i intercanvis culturals: l'experiència dels últims quatre Jocs Olímpics d'estiu, que recoge las ponencias presentadas Simposio internacional celebrado en Barcelona del 3 al 5 de abril de 1991.Aquest text ha estat publicat al llibre Jocs Olímpics, comunicació i intercanvis culturals: l'experiència dels últims quatre Jocs Olímpics d'estiu, que recull les ponències presentades al Simposi internacional celebrat a Barcelona del 3 al 5 d'abril de 1991

Un formulari portàtil de l'any 1826

En aquesta comunicació es dóna a conèixer un formulari que pel seu tamany 10x15 cm, suposa per l'època una novetat pel seu títol "Formulario Portátil". El seu autor M. A. Richard, fou doctor en Medicina, agregat amb exercici a la Facultat de Medicina de Paris i membre de la Reial Acadèmia de Medicina de Paris. L'obra és la primera edició espanyola de la tercera edició francesa, traduïda del francès per Manuel Anselmo Rodriguez, llicenciat en Farmàcia, augmentada amb les substàncies actives descobertes per Pelletier i Caventou, Brandes, Duncan, Chevallier, Lassaigne, Vauquelin, Feneulle, Magendie, Canzoreni, Henry, Ives, Derosne, Sertuerner, Boullay, Desfoses, Orstaedt, Courtois. Fa referència a l'obra de Mateu Orfila i les seves descobertes, així com la descripció dels medicaments, segons les seves formes farmacèutiques i els diferents mètodes curatius. Es dóna a conèixer la segona edició feta a Barcelona l'any 1850

Online Data Stream Learning and Classification with Limited Labels

Mining data streams such as Internet traffic andnetwork security is complex. Due to the difficulty of storage, datastreams analytics need to be done in one scan. This limits thetime to observe stream feature and hence, further complicatesthe data mining processes. Traditional supervised data miningwith batch training natural is not suitable to mine data streams.This paper proposes an algorithm for online data streamclassification and learning with limited labels using selective selftrainingsemi-supervised classification. The experimental resultsshow it is able to achieve up to 99.6% average accuracy for 10%labeled data and 98.6% average accuracy for 1% labeled data. Itcan classify up to 34K instances per second

Accuracy and effectualness of closed-form, frequency-domain waveforms for non-spinning black hole binaries

The coalescences of binary black hole (BBH) systems, here taken to be non-spinning, are among the most promising sources for gravitational wave (GW) ground-based detectors, such as LIGO and Virgo. To detect the GW signals emitted by BBHs, and measure the parameters of the source, one needs to have in hand a bank of GW templates that are both effectual (for detection), and accurate (for measurement). We study the effectualness and the accuracy of the two types of parametrized banks of templates that are directly defined in the frequency-domain by means of closed-form expressions, namely 'post-Newtonian' (PN) and 'phenomenological' models. In absence of knowledge of the exact waveforms, our study assumes as fiducial, target waveforms the ones generated by the most accurate version of the effective one body (EOB) formalism. We find that, for initial GW detectors the use, at each point of parameter space, of the best closed-form template (among PN and phenomenological models) leads to an effectualness >97% over the entire mass range and >99% in an important fraction of parameter space; however, when considering advanced detectors, both of the closed-form frequency-domain models fail to be effectual enough in significant domains of the two-dimensional [total mass and mass ratio] parameter space. Moreover, we find that, both for initial and advanced detectors, the two closed-form frequency-domain models fail to satisfy the minimal required accuracy standard in a very large domain of the two-dimensional parameter space. In addition, a side result of our study is the determination, as a function of the mass ratio, of the maximum frequency at which a frequency-domain PN waveform can be 'joined' onto a NR-calibrated EOB waveform without undue loss of accuracy.Comment: 29 pages, 8 figures, 1 table. Accepted for publication in Phys. Rev.