206 research outputs found
AVALIAÇÃO DA QUALIDADE DA SILAGEM DE AZEVÉM (Lolium multiflorum Lam) ADICIONADA DE CASCA DE SOJA
Vegetation reconstruction to the mid-Holocene transition in Sahel and Sahara : first palynological results of a lacustrine record from the Mega-Lake Chad
Evaluating the effects of redesigning a problem-based learning environment
Though learner-centered and constructivist, there is broad agreement that Problem-Based Learning (PBL) environments are effective in various aspects. Self-dependent learning skills and a well-structured knowledge base are mentioned as two benefits of PBL
Measurement of charm production in neutrino charged-current interactions
The nuclear emulsion target of the CHORUS detector was exposed to the
wide-band neutrino beam of the CERN SPS of 27 GeV average neutrino energy from
1994 to 1997. In total about 100000 charged-current neutrino interactions with
at least one identified muon were located in the emulsion target and fully
reconstructed, using newly developed automated scanning systems. Charmed
particles were searched for by a program recognizing particle decays. The
observation of the decay in nuclear emulsion makes it possible to select a
sample with very low background and minimal kinematical bias. 2013
charged-current interactions with a charmed hadron candidate in the final state
were selected and confirmed through visual inspection. The charm production
rate induced by neutrinos relative to the charged-current cross-section is
measured to be sigma(nu_mu N -> mu- C X)/sigma(CC) = (5.75 +-0.32 stat +-0.30
syst)%. The charm production cross-section as a function of the neutrino energy
is also obtained. The results are in good agreement with previous measurements.
The charm-quark hadronization produces the following charmed hadrons with
relative fractions (in %): f_Dzero = 43.7+-4.5, f_Lambda_c^plus = 19.2+-4.2,
f_Dplus = 25.3+-4.2, and f_D_splus = 11.8+-4.7.Comment: 16 pages, 5 figure
Influence of fire history and soil properties on plant species richness and functional diversity in a neotropical savanna
Micronucleus frequencies in Astyanax bimaculatus (Characidae) treated with cyclophosphamide or vinblastine sulfate
Importância do eletrorretinograma de campo total (Full field ERG) em cães da raça Cocker Spaniel Inglês portadores de catarata
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