Strong evidences for a nonextensive behavior of the rotation period in Open Clusters

Time-dependent nonextensivity in a stellar astrophysical scenario combines nonextensive entropic indices $q_{K}$ derived from the modified Kawaler's parametrization, and $q$, obtained from rotational velocity distribution. These $q$'s are related through a heuristic single relation given by $q\approx q_{0}(1-\Delta t/q_{K})$, where $t$ is the cluster age. In a nonextensive scenario, these indices are quantities that measure the degree of nonextensivity present in the system. Recent studies reveal that the index $q$ is correlated to the formation rate of high-energy tails present in the distribution of rotation velocity. On the other hand, the index $q_{K}$ is determined by the stellar rotation-age relationship. This depends on the magnetic field configuration through the expression $q_{K}=1+4aN/3$, where $a$ and $N$ denote the saturation level of the star magnetic field and its topology, respectively. In the present study, we show that the connection $q-q_{K}$ is also consistent with 548 rotation period data for single main-sequence stars in 11 Open Clusters aged less than 1 Gyr. The value of $q_{K}\sim$ 2.5 from our unsaturated model shows that the mean magnetic field topology of these stars is slightly more complex than a purely radial field. Our results also suggest that stellar rotational braking behavior affects the degree of anti-correlation between $q$ and cluster age $t$. Finally, we suggest that stellar magnetic braking can be scaled by the entropic index $q$.Comment: 6 pages and 2 figures, accepted to EPL on October 17, 201

A nonextensive insight to the stellar initial mass function

the present paper, we propose that the stellar initial mass distributions as known as IMF are best fitted by $q$-Weibulls that emerge within nonextensive statistical mechanics. As a result, we show that the Salpeter's slope of $\sim$2.35 is replaced when a $q$-Weibull distribution is used. Our results point out that the nonextensive entropic index $q$ represents a new approach for understanding the process of the star-forming and evolution of massive stars.Comment: 5 pages, 2 figures, Accepted to EP

Overview of context-sensitive technologies for well-being

Today smart devices such as smartphones, smartwatches and activity trackers are widely available and accepted in most developed societies. These devices present a broad set of sensors capable of extracting detailed information about different situations of daily life, which, if used for good, have the potential to improve the quality of life not only for individuals but also for the society in general. One of the key areas where this type of information can help to improve the quality of life is in healthcare since it allows to monitor and infer the current level of well-being of the smart devices carriers. In this paper, some of the available literature about well-being sensing through context-aware data is reviewed. Also, the main types of mechanisms used in these studies are identified. These mechanisms are related to monitoring, generalization, inference, feedback, energy management and privacy. Furthermore, a description of the mechanisms used in each study is presented.info:eu-repo/semantics/acceptedVersio

Perdas de mamão (Carica papaya L.) comercializado no Estado do Rio de Janeiro.

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Frequência de isolados clínicos de escherichia coli produtores de β-lactamases de largo espectro

Foi objectivo deste estudo determinar a frequência de isolados de E. coli produtores de β-lactamases de largo espectro (ESBLs) tanto em infecções nosocomiais como da comunidade, e avaliar a susceptibilidade aos antibióticos entre as estirpes produtoras e não produtoras de ESBLs. Dos 131 isolados investigados apenas 9 (6.8%) se enquadraram nos critérios definidos pelo CLSI para screening de ESBLs, e a sua presença foi confirmada por Etest ESBL. Estes isolados provieram maioritariamente de infecções da comunidade em doentes com idade avançada e história de hospitalização prévia. A maioria (66.6%) mostrou resistência simultânea aos β-lactâmicos estudados, às quinolonas e aos aminoglicosídeos.It was the purpose of this study to determine the frequency of extended­spectrum β­Lactamases (ESBLs) producing isolates in E. coli, from hospital acquired and community infections, and to evaluate antibiotic susceptibility between ESBL producing and non­producing strains. Of 131 isolates investigated only 9 (6.8%) fulfil CLSI screening criteria for ESBL, and its production was confirmed by ESBL Etest. This strains were mainly recovered form community infections in old aged patients, with an history of previous hospitalisation. The majority (66.6%) showed simultaneous resistance to the studied β­lactams, the quinolones and aminoglycosides