The faint radio source population at 15.7 GHz - II. Multi-wavelength properties

A complete, flux density limited sample of 96 faint ($> 0.5$ mJy) radio sources is selected from the 10C survey at 15.7 GHz in the Lockman Hole. We have matched this sample to a range of multi-wavelength catalogues, including SERVS, SWIRE, UKIDSS and optical data; multi-wavelength counterparts are found for 80 of the 96 sources and spectroscopic redshifts are available for 24 sources. Photometric reshifts are estimated for the sources with multi-wavelength data available; the median redshift of the sample is 0.91 with an interquartile range of 0.84. Radio-to-optical ratios show that at least 94 per cent of the sample are radio loud, indicating that the 10C sample is dominated by radio galaxies. This is in contrast to samples selected at lower frequencies, where radio-quiet AGN and starforming galaxies are present in significant numbers at these flux density levels. All six radio-quiet sources have rising radio spectra, suggesting that they are dominated by AGN emission. These results confirm the conclusions of Paper I that the faint, flat-spectrum sources which are found to dominate the 10C sample below $\sim 1$ mJy are the cores of radio galaxies. The properties of the 10C sample are compared to the SKADS Simulated Skies; a population of low-redshift starforming galaxies predicted by the simulation is not found in the observed sample.IHW acknowledges a Science and Technology Facilities Council studentship. IHW, MJ, MV acknowledge support from the Square Kilometre Array South Africa project and the South African National Research Foundation. MV is supported by the European Commission Research Executive Agency FP7-SPACE- 2013-1 Scheme (Grant Agreement 607254 - Herschel Extragalactic Legacy Project - HELP). This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Opinions expressed and conclusions arrived at are those of the authors and not necessarily attributed to the SKA SA. We thank the anonymous referee for their helpful comments.This is the final version of the article. It first appeared from Oxford University Press via http://dx.doi.org/10.1093/mnras/stv190

VIRTUALIZAÇÃO DO ENSINO SUPERIOR: UM BREVE DIAGNÓSTICO DA PRIMEIRA TURMA DO CURSO DE ADMINISTRAÇÃO PÚBLICA À DISTÂNCIA DA UFSC

O Curso de Bacharelado em Administração Pública, na modalidade à distância, pioneiro na Universidade Federal de Santa Catarina, é oferecido em seis polos de apoio presencial, sendo eles: Araranguá, Lages, Tubarão, Chapecó, Florianópolis e Joinville. O presente estudo tem como objetivo fazer um breve diagnóstico da primeira turma do Curso de Graduação em Administração Pública na modalidade à distância da Universidade Federal de Santa Catarina, por meio de levantamento da situação dos alunos ingressantes em 2009. A pesquisa é bibliográfica e descritiva, numa abordagem quantitativa. O resultado mostra que dos 312 ingressantes, somente 76 concluíram o curso em 4 anos, perfazendo 24,36%. O número de alunos evadidos chegou a 189, o que corresponde a aproximadamente 61% do total inicial. Constatou-se que o elevado índice de evasão não é um problema somente do curso, mas é recorrente nas Instituições de Ensino Superior. Finalmente, ressalta-se a importância da continuidade de estudos e pesquisas que busquem analisar o curso de Administração Pública EaD em sua totalidade, visando diagnosticar as causas da evasão e contribuir para a melhoria contínua do processo de formação dos discentes

Accidental exposure to politics on social media as online participation equalizer in Germany, Italy, and the United Kingdom

We assess whether and how accidental exposure to political information on social media contributes to citizens\u2019 online political participation in comparative perspective. Based on three online surveys of samples representative of German, Italian, and British Internet users in the aftermath of the 2014 European Parliament elections, we find that accidental exposure to political information on social media is positively and significantly correlated with online participation in all three countries, particularly so in Germany where overall levels of participation were lower. We also find that interest in politics moderates this relationship so that the correlation is stronger among the less interested than among the highly interested. These findings suggest that inadvertent encounters with political content on social media are likely to reduce the gap in online engagement between citizens with high and low interest in politics, potentially broadening the range of voices that make themselves heard

A wide-area GMRT 610-MHz survey of ELAIS N1 field

In this paper we present a wide-area 610 MHz survey of the ELAIS\,N1 field with the GMRT, covering an area of 12.8 deg$^2$ at a resolution of 6 arcsec and with an rms noise of $\sim 40$ $\mu$Jy beam$^{-1}$. This is equivalent to $\sim 20$ $\mu$Jy beam$^{-1}$ rms noise at 1.4 GHz for a spectral index of $-0.75$. The primary goal of the survey was to study the polarised sky at sub-mJy flux densities at $<$ GHz frequencies. In addition, a range of other science goals, such as investigations in to the nature of the low-frequency $\mu$Jy source populations and alignments of radio jets. A total of 6,400 sources were found in this region, the vast majority of them compact. The sample jointly detected by GMRT at 610 MHz and by VLA FIRST at 1.4\,GHz has a median spectral index of $-0.85 \pm 0.05$ and a median 610 MHz flux density of 4.5 mJy. This region has a wealth of ancillary data which is useful to characterize the detected sources. The multi-wavelength cross matching resulted optical/IR counterparts to $\sim 90$ per~cent of the radio sources, with a significant fraction having at least photometric redshift. Due to the improved sensitivity of this survey over preceding ones, we have discovered six giant radio sources (GRS), with three of them at $z \sim 1$ or higher. This implies that the population of GRS may be more abundant and common than known to date and if true this has implications for the luminosity function and the evolution of radio sources. We have also identified several candidate extended relic sources

Padronização de processos administrativos de uma secretaria de curso de educação à distância UAB

Dissertação (mestrado profissional) - Universidade Federal de Santa Catarina, Centro Sócio-Econômico, Programa de Pós-Graduação em Administração Universitária, Florianópolis, 2016.Este trabalho acadêmico teve como objetivo proporcionar a padronização dos processos administrativos de uma secretaria de curso de educação à distância do sistema UAB. Para se atingir o objetivo utilizou-se notação BPMN e do software Bizagi como instrumento para a execução da modelagem dos processos. A pesquisa não se limitou a uma forma de ação, mas, buscou aumentar o conhecimento da pesquisadora e o nível de consciência das pessoas/grupos envolvidos. A Gestão por Processos orientada à entrega por meio dos objetos foi a metodologia apresentada ao longo desta pesquisa que procura respeitar a lógica da eficácia antes da eficiência. Tratou-se de uma pesquisa aplicada, qualitativa, descritiva e, quanto aos meios como estudo de caso, sendo bibliográfica e documental. A pesquisa resultou na identificação dos processos críticos da Secretaria do curso de Administração Pública EAD da Universidade Federal de Santa Catarina; no mapeamento de seus processos críticos ; na identificação dos gargalos dos processos estudados; na proposição de melhorias em quatro processos críticos da secretaria estudada bem como a proposição de melhoria em um formulário. Objetivou-se a correta identificação e ação sobre os gargalos a fim de superar ou minimizar os efeitos prejudiciais dessas restrições, são indispensáveis para a tomada de decisão com relação à capacidade produtiva da secretaria. Durante o estudo de caso foram identificados e descritos os principais processos da secretaria (processos críticos) e elaboração do desenho ou redesenho destes para a realização de rotinas administrativas em um ambiente informatizado e focar a contribuição de normatização e padronização de rotinas para a diminuição de morosidade e erros, gerando qualidade na realização destas. Esta pesquisa identificou sete processos críticos de competência da Secretaria estudada, destes foram propostas melhorias em quatro e sugestão de melhoria em um formulário

A doxa política das finanças: o discurso dos banqueiros diante da nova matriz econômica do governo Dilma Rousseff (2011-14)

Este artigo busca identificar e examinar as razões que levaram os banqueiros a assumir um posicionamento crítico em relação à política econômica do primeiro mandato presidencial de Dilma Rousseff, entre 2011 e 2014. Tendo-se como hipótese forte o fator cálculo empresarial, e assumindo como orientação metodológica a conciliação da reconstrução da conjuntura política do período com análise de linguagem dos atores em foco, concluiu-se que a Nova Matriz Econômica, ao flexibilizar fundamentos macroeconômicos ortodoxos que os governos Lula haviam respeitado, confrontou interesses do setor financeiro. Este, em face de motivações pragmáticas, denegou o governo e passou a criticá-lo, demandando o retorno da condução econômica em moldes mais rígidos.

The nature of the faint low-frequency radio source population

We present a multiwavelength study into the nature of faint radio sources in a deep radio image with the Giant Meterwave Radio Telescope at 612 MHz covering 1.2 deg$^2$ of the ELAIS N1 region. We detect 2800 sources above 50 µJy beam$^{−1}$. By matching to multiwavelength data, we obtain a redshift estimate for 63 per cent, with 29 per cent based on spectroscopy. For 1526 of the sources with redshifts, we use radio and X-ray luminosity, optical spectroscopy, mid-infrared colours and 24 µm and IR to radio flux ratios to search for the presence of an active galactic nucleus (AGN). The analysis reveals a rapid change in the population as flux density decreases from ~500 µJy to ~100 µJy. We find that 80.3 per cent of the objects show no evidence of AGN and have multiwavelength properties consistent with radio emission from star-forming galaxies (SFG). We classify 11.4 per cent as radio-quiet (RQ) AGN and the remaining 8.3 per cent as radio-loud (RL) AGN. The redshift of all populations extends to $z$ > 3 with a median of ~1. The median radio and far-IR luminosity increases systematically from SFG, to RQ AGN and RL AGN. The median $q_\text{24 µm}$ for SFG, 0.89 ± 0.01, is slightly below that for RQ AGN, 1.05 ± 0.03, and both differ substantially from the value for RL AGN of −0.06 ± 0.07. However, SFG and RQ AGN show no significant difference in far-IR/radio ratios and have statistically indistinguishable star formation rates inferred from radio and farIR luminosities. We conclude that radio emission from host galaxies of RQ AGN in this flux density regime results primarily from star formation activity.The authors acknowledge support from the Square Kilometre Array South Africa project, the South African National Research Foundation and Department of Science and Technology. EFO acknowledges funding from the National Astrophysics and Space Science Programme. MV acknowledges support from the European Commission Research Executive Agency (FP7-SPACE-2013-1 GA 607254), the South African Department of Science and Technology (DST/CON 0134/2014) and the Italian Ministry for Foreign Affairs and International Cooperation (PGR GA ZA14GR02). We thank the staff of the GMRT that made these observations possible. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA