Here\u27s To The Nut - Brown Ale!

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Intercomparison of Multiple UV-LIF Spectrometers using the Aerosol Challenge Simulator

Measurements of primary biological aerosol particles (PBAPs) have been conducted worldwide using ultraviolet light-induced fluorescence (UV-LIF) spectrometers. However, how these instruments detect and respond to known biological and non-biological particles, and how they compare, remains uncertain due to limited laboratory intercomparisons. Using the Defence Science and Technology Laboratory, Aerosol Challenge Simulator (ACS), controlled concentrations of biological and non-biological aerosol particles, singly or as mixtures, were produced for testing and intercomparison of multiple versions of the Wideband Integrated Bioaerosol Spectrometer (WIBS) and Multiparameter Bioaerosol Spectrometer (MBS). Although the results suggest some challenges in discriminating biological particle types across different versions of the same UV-LIF instrument, a difference in fluorescence intensity between the non-biological and biological samples could be identified for most instruments. While lower concentrations of fluorescent particles were detected by the MBS, the MBS demonstrates the potential to discriminate between pollen and other biological particles. This study presents the first published technical summary and use of the ACS for instrument intercomparisons. Within this work a clear overview of the data pre-processing is also presented, and documentation of instrument version/model numbers is suggested to assess potential instrument variations between different versions of the same instrument. Further laboratory studies sampling different particle types are suggested before use in quantifying impact on ambient classification.Peer reviewe

Multi-jet cross sections at NLO with BlackHat and Sherpa

In this talk, we report on a recent next-to-leading order QCD calculation of the production of a W boson in association with three jets at hadron colliders. The computation is performed by combining two programs, BlackHat for the computation of the virtual one-loop matrix elements and Sherpa for the real emission part.Comment: 4 pages, contribution to the proceedings of the XLIIIth Rencontres de Moriond (QCD

Next-to-Leading Order Jet Physics with BlackHat

We present several results obtained using the BlackHat next-to-leading order QCD program library, in conjunction with SHERPA. In particular, we present distributions for vector boson plus 1,2,3-jet production at the Tevatron and at the asymptotic running energy of the Large Hadron Collider, including new Z+3-jet distributions. The Z+2-jet predictions for the second-jet P_T distribution are compared to CDF data. We present the jet-emission probability at NLO in W+2-jet events at the LHC, where the tagging jets are taken to be the ones furthest apart in pseudorapidity. We analyze further the large left-handed W polarization, identified in our previous study, for W bosons produced at high P_T at the LHC.Comment: Presented at RADCOR 2009 - 9th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology), October 25 - 30 2009, Ascona, Switzerland}, 12 pages, 9 figures, LaTeX, v2 updated small correction to polarization effect plo

VOZES NEGRAS NA HISTÓRIA DA EDUCAÇÃO: RACISMO, EDUCAÇÃO E MOVIMENTO NEGRO NO ESPÍRITO SANTO (1978-2002)

Esta pesquisa investiga a constituição histórica e os significados atribuídos à educação pelo movimento negro capixaba, interrogando as fontes a partir das seguintes questões: de que modo a educação se constituiu em pauta central do movimento negro no Espírito Santo? Quais usos e sentidos foram atribuídos à educação pelo conjunto desse movimento? De que maneira a militância negra movimenta e mobiliza seus espaços-tempos para o combate ao racismo na educação? De que modo a categoria negro é concebida na agenda política do movimento negro? Quais implicações o movimento negro tem produzido no contexto da educação escolar? Trata-se aqui de uma prática historiográfica sustentada pela inesgotabilidade e pluralidade das fontes, pela leitura indiciária e entrecruzada dos documentos produzidos e pela problematização de relações de força inerentes aos contextos de produção das fontes consultadas. O período investigado (entre 1978 e 2002) compreendeu a fase de (re)organização do movimento negro no Espírito Santo e o ano que antecedeu a promulgação da Lei nº 10639/2003, sobre a obrigatoriedade do ensino da história e da cultura afro-brasileira e africana nos estabelecimentos oficiais de ensino no Brasil. Foram utilizadas como fontes as narrativas obtidas por meio de entrevistas com militantes negros, relatórios e diretrizes de governo, publicações em jornais, periódicos capixabas, e documentos produzidos por organizações negras. Na interseção da História da Educação do Espírito Santo com a História do Movimento Negro Capixaba, vozes negras problematizam o ensino, a didática, o currículo, o material de ensino e a formação de professores, à medida que atribuem sentidos e elegem a educação escolar como principal campo de afirmação político-cultural e ascensão socioeconômica da população negra, para além do acesso e permanência dessa população no sistema de ensino. Por outro lado, observou-se que o percurso da militância negra no campo da educação ocorreu entrelaçado a uma práxis na qual não basta incluir conteúdos no currículo; faz-se necessário, também, transformar a educação. Nesse processo de transformação, a descoberta, o pertencimento identitário e o compromisso histórico coletivo emergem como principais categorias no processo de atribuição de sentidos à prática educativa pautada pela Consciência Negra

NLO vector boson production with light jets

In this contribution we present recent progress in the computation of next-to-leading order (NLO) QCD corrections for the production of an electroweak vector boson in association with jets at hadron colliders. We focus on results obtained using the virtual matrix element library BLACKHAT in conjunction with SHERPA, focusing on results relevant to understanding the background to top production.Comment: 4+2 epsilon pages, Submitted for the proceedings of TOP2011 - 4th International Workshop on Top Quark Physics, 25-30th September 2011, Sant Feliu de Guixols, Spai

The brightest pure-H ultracool white dwarf

We report the identification of LSR J0745+2627 in the United Kingdom InfraRed Telescope Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) as a cool white dwarf with kinematics and age compatible with the thick-disk/halo population. LSR J0745+2627 has a high proper motion (890 mas/yr) and a high reduced proper motion value in the J band (H_J=21.87). We show how the infrared-reduced proper motion diagram is useful for selecting a sample of cool white dwarfs with low contamination. LSR J0745+2627 is also detected in the Sloan Digital Sky Survey (SDSS) and the Wide-field Infrared Survey Explorer (WISE). We have spectroscopically confirmed this object as a cool white dwarf using X-Shooter on the Very Large Telescope. A detailed analysis of its spectral energy distribution reveals that its atmosphere is compatible with a pure-H composition model with an effective temperature of 3880+-90 K. This object is the brightest pure-H ultracool white dwarf (Teff<4000 K) ever identified. We have constrained the distance (24-45 pc), space velocities and age considering different surface gravities. The results obtained suggest that LSR J0745+2627 belongs to the thick-disk/halo population and is also one of the closest ultracool white dwarfs.Comment: 5 pages, 7 figures, accepted for publication in A&A Letter