Centrality Dependence of the High p_T Charged Hadron Suppression in Au+Au collisions at sqrt(s_NN) = 130 GeV

PHENIX has measured the centrality dependence of charged hadron p_T spectra from central Au+Au collisions at sqrt(s_NN)=130 GeV. The truncated mean p_T decreases with centrality for p_T > 2 GeV/c, indicating an apparent reduction of the contribution from hard scattering to high p_T hadron production. For central collisions the yield at high p_T is shown to be suppressed compared to binary nucleon-nucleon collision scaling of p+p data. This suppression is monotonically increasing with centrality, but most of the change occurs below 30% centrality, i.e. for collisions with less than about 140 participating nucleons. The observed p_T and centrality dependence is consistent with the particle production predicted by models including hard scattering and subsequent energy loss of the scattered partons in the dense matter created in the collisions.Comment: 7 pages text, LaTeX, 6 figures, 2 tables, 307 authors, resubmitted to Phys. Lett. B. Revised to address referee concerns. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are publicly available at http://www.phenix.bnl.gov/phenix/WWW/run/phenix/papers.htm

NEOTROPICAL XENARTHRANS: a data set of occurrence of xenarthran species in the Neotropics

Xenarthrans – anteaters, sloths, and armadillos – have essential functions for ecosystem maintenance, such as insect control and nutrient cycling, playing key roles as ecosystem engineers. Because of habitat loss and fragmentation, hunting pressure, and conflicts with 24 domestic dogs, these species have been threatened locally, regionally, or even across their full distribution ranges. The Neotropics harbor 21 species of armadillos, ten anteaters, and six sloths. Our dataset includes the families Chlamyphoridae (13), Dasypodidae (7), Myrmecophagidae (3), Bradypodidae (4), and Megalonychidae (2). We have no occurrence data on Dasypus pilosus (Dasypodidae). Regarding Cyclopedidae, until recently, only one species was recognized, but new genetic studies have revealed that the group is represented by seven species. In this data-paper, we compiled a total of 42,528 records of 31 species, represented by occurrence and quantitative data, totaling 24,847 unique georeferenced records. The geographic range is from the south of the USA, Mexico, and Caribbean countries at the northern portion of the Neotropics, to its austral distribution in Argentina, Paraguay, Chile, and Uruguay. Regarding anteaters, Myrmecophaga tridactyla has the most records (n=5,941), and Cyclopes sp. has the fewest (n=240). The armadillo species with the most data is Dasypus novemcinctus (n=11,588), and the least recorded for Calyptophractus retusus (n=33). With regards to sloth species, Bradypus variegatus has the most records (n=962), and Bradypus pygmaeus has the fewest (n=12). Our main objective with Neotropical Xenarthrans is to make occurrence and quantitative data available to facilitate more ecological research, particularly if we integrate the xenarthran data with other datasets of Neotropical Series which will become available very soon (i.e. Neotropical Carnivores, Neotropical Invasive Mammals, and Neotropical Hunters and Dogs). Therefore, studies on trophic cascades, hunting pressure, habitat loss, fragmentation effects, species invasion, and climate change effects will be possible with the Neotropical Xenarthrans dataset

Características cinemáticas de potros da raça Brasileiro de Hipismo nos sucessos e insucessos dos saltos em liberdade

This study was carried out to evaluate kinematics traits of young horses during free jum- ping regarding their success or not. One hundred and eight young Brazilian Sport Horses in five free jumpings attempts were record over a vertical obstacle of 0.60 m, 0.80 and 1.05 m height at 22-25 to 29-32 and 36-39 months of age, respectively. A total of 1.348 jumping attempts were recorded and evaluated. From these, 1.067 jumping were successful (79.1 %) and 281 were failure (20.9 %) (p<0.01). Regarding failure jumpings, 15.3 % were for knoc- kdown, 4.5 % by run-out and 1.1 % by refusal. Successful jumpings presented larger take-off distance, of 1.17 m, 1.51 m and 1.52 m on the first, second and third evaluation, respectively. It was observed that jumping velocity decreased in successful jumpings when compared to unsuccessful ones, of 0.59 m/s in the first; of 0.19 m/s in the second and 0.35 m/s in the third assessment. Height of withers during jumping was higher on successful jumps when compared to failures jumpings, and it was influenced by obstacle height. Angles of head and neck were similar between successful and unsuccessful jumpings, except the head angle at the first evaluation, of 48.6 o and 60.4 o, in successful and failure jumps, respectively. Jumping success was approximately 80 % in all evaluation, with the highest percentage of penalties regarding young horse of 36-39 months of age, with obstacle height of 1.05 m. Knockdown was the main penalty throughout the evaluation periods. The most important variables for young horses successful jumping, regardless of the evaluation period, were higher take-off distance and lower jumping velocity.Objetivou-se avaliar as características cinemáticas de potros nos saltos em liberdade, com sucesso ou insucesso. Foram avaliados 108 potros Brasileiro de Hipismo em cinco sal- tos, em liberdade, no obstáculo vertical com altura de 0,60 m aos 22-25 meses de idade; 0,80 m aos 29-32 meses de idade e 1,05 m aos 36-39 meses de idade. Foram filmados e avaliados 1.348 saltos, sendo 1.067 saltos com sucesso (79,1 %) e 281 saltos com insuces- so (20,9 %) (p<0,01). Nos saltos com insucesso, 15,3 % foram por derrube de obstáculo, 4,5 % por desvio e 1,1 % por refugo. Os saltos com sucesso apresentaram maior distância da batida, de 1,17 m; 1,51 m e 1,52 m na primeira, segunda e terceira avaliação, respec- tivamente. Observou-se que a velocidade do salto reduziu nos saltos com sucesso quando comparados com os saltos com insucesso, de 0,59 m/s na primeira; de 0,19 m/s na segunda e de 0,35 m/s na terceira avaliação. A altura na cernelha durante o salto foi maior nos saltos com sucesso em relação aos com insucesso, sendo influenciada pela altura do obstáculo. Os ângulos da cabeça e do pescoço foram similares entre os saltos com sucesso e insucesso, exceto o ângulo da cabeça na primeira avaliação, de 48,6 o e 60,4 o, nos saltos com sucesso e com insucesso, respectivamente. O sucesso dos potros no salto foi de aproximadamente 80 %, com maior percentual de penalidades nos potros de 36-39 meses de idade, com obs- táculo na altura de 1,05 m. O derrube de obstáculos foi a principal penalidade durante a avaliação. As variáveis mais importantes para o sucesso do salto dos potros, independente do período de avaliação, foram a maior distância da batida e a menor velocidade do salto