8,668 research outputs found
The Discovery of an X-ray/UV Stellar Flare from the Late-K/Early-M Dwarf LMC 335
We report the discovery of an X-ray/UV stellar flare from the source LMC 335,
captured by XMM-Newton in the field of the Large Magellanic Cloud. The flare
event was recorded continuously in X-ray for its first 10 hours from the
precursor to the late decay phases. The observed fluxes increased by more than
two orders of magnitude at its peak in X-ray and at least one in the UV as
compared to quiescence. The peak 0.1-7.0 keV X-ray flux is derived from the
two-temperature APEC model to be ~(8.4 +/- 0.6) x 10^-12 erg cm-2 s-1.
Combining astrometric information from multiple X-ray observations in the
quiescent and flare states, we identify the NIR counterpart of LMC 335 as the
2MASS source J05414534-6921512. The NIR color relations and spectroscopic
parallax characterize the source as a Galactic K7-M4 dwarf at a foreground
distance of (100 - 264) pc, implying a total energy output of the entire event
of ~(0.4 - 2.9) x 10^35 erg. This report comprises detailed analyses of this
late-K / early-M dwarf flare event that has the longest time coverage yet
reported in the literature. The flare decay can be modeled with two exponential
components with timescales of ~28 min and ~4 hours, with a single component
decay firmly ruled out. The X-ray spectra during flare can be described by two
components, a dominant high temperature component of ~40-60MK and a low
temperature component of ~10MK, with a flare loop length of about 1.1-1.3
stellar radius.Comment: 35 pages, 6 figures, 5 tables, accepted for publication in Ap
Nuclear isotope thermometry
We discuss different aspects which could influence temperatures deduced from
experimental isotopic yields in the multifragmentation process. It is shown
that fluctuations due to the finite size of the system and distortions due to
the decay of hot primary fragments conspire to blur the temperature
determination in multifragmentation reactions. These facts suggest that caloric
curves obtained through isotope thermometers, which were taken as evidence for
a first-order phase transition in nuclear matter, should be investigated very
carefully.Comment: 9 pages, 7 figure
Effect of isospin dependent cross-section on fragment production in the collision of charge asymmetric nuclei
To understand the role of isospin effects on fragmentation due to the
collisions of charge asymmetric nuclei, we have performed a complete
systematical study using isospin dependent quantum molecular dynamics model.
Here simulations have been carried out for , where n
varies from 47 to 59 and for , where m varies from 14
to 23. Our study shows that isospin dependent cross-section shows its influence
on fragmentation in the collision of neutron rich nuclei
O assistente social como mediador cultural em escolas públicas dos bairros de Guamá e Terra firme
I Congresso Internacional América Latina e Interculturalidade: América Latina e Caribe: cenários linguÃstico-culturais contemporâneos, 07, 08 e 09 de novembro de 2013 - UNILAA intervenção do Assistente Social nas atividades de arte e cultura nas instituições de ensino
fundamental e médio nos bairros do Guamá e da Terra Firme. Estudos anteriores constatam que estes
não são apenas espaços de violência, como registra a mÃdia. São espaços multiculturais e agregadores de
cultura antiviolência, onde os sujeitos artistas utilizam a arte como meio de transformação social,
através do método fenomenológico busco contribuir para a sistematização da intervenção do assistente
social na área da educação e cultura, identificando as atividades de arte e cultura nas instituições de
ensino fundamental e médio, importância nas instituições em que são desenvolvidas e habilidades
requeridas ao profissional de Serviço Social. A metodologia conduziu a investigação nos respectivos
bairros com os alunos que estudam nas instituições de ensino fundamental e médio nos bairros, por
meio de aplicação de questionários sócioÂeconômicoÂcultural que ao definir cultura identificaram as
manifestações culturais que estavam ocorrendo no mês (junho/2013) em que o questionário foi aplicado,
quanto ao fazer profissional do Serviço Social, a maioria dos alunos da escola pública estadual
relacionam o trabalho do assistente social com a prestação de ajuda e auxÃlio. Os alunos da escola
pública federal demonstraram maior efetividade e segurança na resposta, em consonância com o Código
de Ética do Assistente Social, também foi realizada entrevista semiÂestruturada com a Assistente Social
das instituições de ensino. Segundo a pesquisa identificaÂse a sobrecarga do profissional do serviço social
com as demandas postas pelos alunos no processo de ensino e aprendizagem, de tal modo que não
possa acompanhar atividades de arte e cultura desenvolvidas nas instituições de ensino, e por meio de
levantamentos bibliográficos e visitas de observação ao local de pesquisa foi possÃvel identificar as
atividades, projetos de extensão de arte e cultura nas instituições de ensino
Space Shuttle/TDRSS communication and tracking systems analysis
In order to evaluate the technical and operational problem areas and provide a recommendation, the enhancements to the Tracking and Data Delay Satellite System (TDRSS) and Shuttle must be evaluated through simulation and analysis. These enhancement techniques must first be characterized, then modeled mathematically, and finally updated into LinCsim (analytical simulation package). The LinCsim package can then be used as an evaluation tool. Three areas of potential enhancements were identified: shuttle payload accommodations, TDRSS SSA and KSA services, and shuttle tracking system and navigation sensors. Recommendations for each area were discussed
Measuring the Temperature of Hot Nuclear Fragments
A new thermometer based on fragment momentum fluctuations is presented. This
thermometer exhibited residual contamination from the collective motion of the
fragments along the beam axis. For this reason, the transverse direction has
been explored. Additionally, a mass dependence was observed for this
thermometer. This mass dependence may be the result of the Fermi momentum of
nucleons or the different properties of the fragments (binding energy, spin
etc..) which might be more sensitive to different densities and temperatures of
the exploding fragments. We expect some of these aspects to be smaller for
protons (and/or neutrons); consequently, the proton transverse momentum
fluctuations were used to investigate the temperature dependence of the source
Eye–hand coordination and its relationship with sensori-motor impairments in stroke survivors
Evidence based treatment for unstable slipped upper femoral epiphysis : systematic review and exploratory patient level analysis
The management of slipped upper femoral epiphysis is controversial and evolving as insight into the condition develops. Loder introduced the concept of slip stability and demonstrated a strong association between poor outcome and instability. Almost half of patients with unstable slip developed femoral head osteonecrosis. This has been influential in surgeons' choice of treatments. Some surgeons have adopted a minimal intervention approach such as pinning in situ or gentle reduction and pinning whereas others advocated an urgent open reduction and stabilisation of slip using various surgical techniques. In this review we analysed the influence of various interventions, timing of surgery and severity of the slip on the outcome of unstable slip
How to monitor patient safety in primary care? Healthcare professionals’ views
Objective: To identify patient safety monitoring strategies in primary care.
Design: Open-ended questionnaire survey.
Participants/Setting: 113 healthcare professionals based in North-West London returned the survey from a group of 500 who were invited to participate achieving a response rate of 22.6 per cent.
Method: A paper-based and equivalent online survey was developed and subjected to multiple stages of piloting. Respondents were asked to suggest strategies for monitoring patient safety in primary care. These monitoring suggestions were then subjected to a content frequency analysis which was conducted by two researchers.
Outcome measures: Respondent-derived monitoring strategies.
Results: In total, respondents offered 188 suggestions for monitoring patient safety in primary care. The content analysis revealed that these could be condensed into twenty-four different future monitoring strategies with varying levels of support. Most commonly, respondents supported the suggestion that patient safety can only be monitored effectively in primary care with greater levels of staffing or with additional resources.
Discussion: This study identified twenty-four possible ways in which monitoring patient safety in North-West London primary care could be achieved. Future work should explore the feasibility of these monitoring strategies as well as the patients’ perspectives on how the safety of their care should be monitored
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