Encontrados 7 documentos, a visualizar página 1 de 1
Trabalho com as mãos: Senhor Carvalho
Ferreira, Ana Rita e Silva DiasO projeto de mestrado Trabalho com as mãos: Senhor Carvalho propõe o protótipo para uma linha editorial que retrata uma série de ofícios artesanais e em extinção, no espaço português. Este trabalho desenvolve-se desde a pesquisa, investigação e documentação de uma destas profissões – a de um encadernador –, passando pela edição de conteúdos, até ao design e produção gráfica de um livro, num exercício que vai ex...
Pseudo-outbreak of Clostridium difficile associated diarrhea (CDAD) in a tertia...
Dias,M. Beatriz Souza; Yamashiro,Juliana; Borrasca,Vera L.; Stempliuk,Valeska A.; Araújo,Maria Rita E.; Costa,Silvia F.; Levin,Anna S.The objective of this study was to describe a pseudo-outbreak of C. difficile in a hospital, following a change in the method used to detect the toxin. In February 2002, there were two cases of CDAD and in March 7 occurred, coinciding with a change of the test (from detection of toxin A to toxin A/B). An outbreak was suspected. Active surveillance and education of staff were started. A CDAD case was defined as ...
Up conversion from visible to ultraviolet in bulk ZnO implanted with Tm ions
Monteiro, T.; Neves, A. J.; Soares, M. J.; Carmo, M. C.; Peres, M.; Alves, E.; Rita, E.We report on the up-converted ultraviolet near-band edge emission of bulk ZnO generated by visible and ultraviolet photons with energies below the band gap. This up-converted photoluminescence was observed in samples intentionally doped with Tm ions, suggesting that the energy levels introduced by the rare earth ion in the ZnO band gap are responsible for this process. ; FCT/FEDER - POCTI/CTM/45236/02 ; FCT/F...
Near-band-edge slow luminescence in nominally undoped bulk ZnO
Monteiro, T.; Neves, A.J.; Carmo, M.C.; Soares, M.J.; Peres, M.; Wang, J.; Alves, E.; Rita, E.; Wahl, U.We report the observation of slow emission bands overlapped with the near-band-edge steady-state luminescence of nominally undoped ZnO crystals. At low temperatures the time-resolved spectra are dominated by the emission of several high-energy bound exciton lines and the two-electron satellite spectral region. Furthermore, two donor-acceptor pair transitions at 3.22 and 3.238 eV are clearly identified in temper...
Photoluminescence and damage recovery studies in Fe-implanted ZnO single crystals
Monteiro, T.; Boemare, C.; Soares, M.J.; Rita, E.; Alves, E.We report Fe3+-related emission in ion-implanted ZnO single crystals. Iron ions were implanted at room temperature with 100 keV and a fluence of 1×1016 Fe+/cm2, and were submitted to annealing treatments in vacuum and in air. After implantation, the damage raises the minimum yield (χmin) from 2% to 50%. Annealing in an oxidizing atmosphere leads to a reduction of the implantation damage, which is fully recovere...
Comparison of continental Portugal and Azores Islands aerosol during a Sahara d...
Reis, M. A.; Oliveira, O. R.; Alves, L. C.; Rita, E. M.; Rodrigues, Félix; Fialho, Paulo; Pio, Casimiro; Freitas, Maria do Carmo; Soares, J. C.Copyright © 2002 Elsevier B.V. All rights reserved. ; Airborne particulate matter plays an important role in the Earth's energy balance. One of the main reasons is that the real size of a significant number of the particles, mainly those of anthropogenic origin, is similar to the wavelength of visible light. Knowledge of the composition of such particles, as well as their dynamics and trajectories in the atmos...
Analysis of Atmospheric Aerosols Using the Lisbon Nuclear Micropore
Rita, E. M.; Alves, L. C.; Reis, M. A.; Rodrigues, A. F.; Fialho, Paulo; Soares, J. C.Proceedings of the XXXVI Zakopane School of Physics, Zakopane 2001. ; Copyright © 2001 Polish Academy of Sciences. ; The nuclear microprobe installed at Instituto Tecnológico e Nuclear, in Lisbon, was used in the analysis of aerosols collected at the Azores islands. Samples from two different aerosol groups were analysed. One referred to aerosols that were carried from North America and the other one containe...
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