A First Search for coincident Gravitational Waves and High Energy Neutrinos using LIGO, Virgo and ANTARES data from 2007

We present the results of the first search for gravitational wave bursts associated with high energy neutrinos. Together, these messengers could reveal new, hidden sources that are not observed by conventional photon astronomy, particularly at high energy. Our search uses neutrinos detected by the underwater neutrino telescope ANTARES in its 5 line configuration during the period January - September 2007, which coincided with the fifth and first science runs of LIGO and Virgo, respectively. The LIGO-Virgo data were analysed for candidate gravitational-wave signals coincident in time and direction with the neutrino events. No significant coincident events were observed. We place limits on the density of joint high energy neutrino - gravitational wave emission events in the local universe, and compare them with densities of merger and core-collapse events.Comment: 19 pages, 8 figures, science summary page at http://www.ligo.org/science/Publication-S5LV_ANTARES/index.php. Public access area to figures, tables at https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=p120000

Heat Flux Measurements Of Tb3m Series (m=co, Rh And Ru): Specific Heat And Magnetocaloric Properties

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)We report on the magnetic properties and magnetocaloric effect (MCE) for the Tb3M series, with M=Co, Rh and Ru, obtained using a heat flux technique. The specific heat of Tb3Co and Tb3Rh are very similar, with a first order type transition occurring around 6 K below the magnetic ordering temperature without any corresponding feature on the magnetization. The slightly enhanced electronic specific heat, the Debye temperature around 150 K and the presence of the magnetic specific heat well above the ordering temperature are also characteristic of many other compounds of the R3M family (R=Rare Earth). The specific heat for Tb3Ru, however, presents two peaks at 37 K and 74 K. The magnetization shows that below the first peak the system presents an antiferromagnetic behavior and is paramagnetic above 74 K. We obtained a magnetocaloric effect for M=Co and Rh, −∆S=12 J/kg K, but for Tb3Ru it is less than 3 J/kg K (μ0∆H=5 T). We believe that the experimental results show that the MCE is directly related with the process of hybridization of the (R)5d-(M)d electrons that occurs in the R3M materials. © 2016 Elsevier B.V.5036469CAPES, Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorCNPq, Conselho Nacional de Desenvolvimento Científico e TecnológicoFAPESP, Fundação de Amparo à Pesquisa do Estado de São PauloCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

Decomposição de serrapilheira em bosque de sabiá na Zona da Mata de Pernambuco Litter decomposition under a sabiá canopy in the Forest Zone in Pernambuco

Objetivou-se avaliar a decomposição de frações de serrapilheira de sabiá (Mimosa caesalpiniifolia Benth) utilizando-se a técnica de sacos de náilon. Foram incubadas as seguintes frações de serrapilheira: folha senescente, folha no início da mineralização e ramos com até 20 mm de diâmetro. A incubação foi realizada nos períodos de 0, 4, 8, 16, 64, 100 e 256 dias nos anos de 2006 e 2007. As frações foram distribuídas em blocos ao acaso com cinco repetições. Foram avaliados os desaparecimentos de biomassa, nitrogênio (N) e fósforo (P), as concentrações de nitrogênio e fósforo e a relação carbono/ nitrogênio da serrapilheira ao longo dos períodos de incubação. De modo geral, o modelo exponencial negativo explicou o desaparecimento de biomassa, nitrogênio e fósforo, todavia, houve variação entre anos e, em alguns casos, apesar de significativos, os modelos apresentaram baixa correlação entre dados observados e preditos. A taxa de desaparecimento de biomassa foi lenta, uma vez que apenas 30% de biomassa de folhas foi mineralizada após 256 dias de incubação. A mineralização líquida de nitrogênio apresentou ampla variação entre anos e diferiu entre as frações estudadas. O teor de nitrogênio da serrapilheira incubada aumentou, em média, até os 32 dias (folhas) e até os 64 dias (ramos) de incubação, estabilizando-se em seguida. Foi usado o modelo platô linear para explicar esse processo. Com o passar dos períodos de incubação, a relação carbono/ nitrogênio diminuiu. Apesar de elevado teor de nitrogênio, a decomposição da serrapilheira de sabiá é lenta, o que pode reduzir as perdas de nutrientes no bosque, aumentando sua sustentabilidade e reduzindo os possíveis efeitos deletérios ao ambiente.<br>The research aimed to evaluate the decomposition of sabiá (Mimosa caesalpiniifolia Benth) litter fractions by using the nylon bag technique. The following litter fractions were incubated: senescent leaves, leaves at the beginning of mineralization, and branches with diameter up to 20 mm. Incubation was performed during periods of 0, 4, 8, 16, 64, 100, and 256 days in 2006 and 2007. The fractions were distributed in a random block design with five replications. It was evaluated the disappearance of biomass, nitrogen (N), and phosphorus (P), concentrations of nitrogen and phosphorus and the carbon/ nitrogen ratio of litter during the periods of incubation. In general, the negative exponential model explained the disappearance of biomass, nitrogen, and phosphorus, however, there was a variation among years and, in some cases, despite of being significant, the models showed a low correlation between predicted and observed data. Biomass disappearance rate was slow because only 30% of leaf biomass was mineralized after 256 days of incubation. Net nitrogen mineralization showed large variation among years, and it differed among the studied fractions. Nitrogen content of the litter increased, on average, until 32 days (leaves) and until 64 days (branches) of incubation followed by stabilization. The linear plateau model was used to explain that process. In the course of the incubation periods, the carbon/nitrogen ration decreased. Despite of the high content of nitrogen, the decomposition of sabiá litter is slow, what might reduce the loss of nutrients in the forest, increasing its sustainability and reducing the possible deleterious effects to the environment