91 research outputs found
Saliency on a chip: a digital approach with an FPGA
Selective-visual-attention algorithms have
been successfully implemented in analog
VLSI circuits.1 However, in addition to
the usual issues of analog VLSIâsuch as
the need to fi ne-tune a large number of biasesâ
these implementations lack the spatial
resolution and pre-processing capabilities
to be truly useful for image-processing
applications. Here we take an alternative
approach and implement a neuro-mimetic
algorithm for selective visual attention in
digital hardware
Présence de métaux lourds et de résidus médicamenteux dans les effluents des établissements de santé de Dakar (Sénégal)
Lâobjectif de cette Ă©tude est de quantifier les concentrations en mĂ©taux lourds et de rechercher la prĂ©sence de rĂ©sidus de molĂ©cules mĂ©dicamenteuses des effluents de trois hĂŽpitaux de Dakar (SĂ©nĂ©gal). Câest ainsi que la collecte des effluents a Ă©tĂ© rĂ©alisĂ©e chaque jour sur une pĂ©riode de trois semaines Ă lâentrĂ©e du dĂ©versoir des services de radiologie, de mĂ©decine interne et dâodontologie. Ensuite, des Ă©chantillons composites par semaine ont Ă©tĂ© constituĂ©s pour rechercher leur composition en mĂ©taux lourds et en rĂ©sidus mĂ©dicamenteux. Le transport a Ă©tĂ© effectuĂ© Ă +4 °C et Ă l'obscuritĂ© pour assurer une conservation satisfaisante. Les mĂ©taux lourds ont Ă©tĂ© dosĂ©s par ICP-MS et les rĂ©sidus de mĂ©dicaments ont Ă©tĂ© recherchĂ©s par UPLCMS/ MS. Les mĂ©dicaments identifiĂ©s dans les effluents sont essentiellement des analgĂ©siques et des psychotropes. La concentration en mĂ©taux lourds des effluents des trois hĂŽpitaux est infĂ©rieure aux normes sĂ©nĂ©galaises et de celles de LâOMS fixant les conditions de rejet de mĂ©taux dans les eaux usĂ©es. Cependant, bien que les taux retrouvĂ©s soient tolĂ©rables, leur introduction continuelle en milieu aquatique pourrait ĂȘtre Ă lâorigine dâeffets nĂ©fastes sur les organismes marins par des phĂ©nomĂšnes de bioaccumulation et de biomagnification. DâoĂč lâimportance et la nĂ©cessitĂ© des stations dâĂ©puration pour une bonne gestion et une rĂ©duction des risques Ă©cotoxicologiques liĂ©s aux effluents liquides hospitaliers.Mots clĂ©s : Effluents hospitaliers, mĂ©taux lourds, rĂ©sidus mĂ©dicamenteux, toxicitĂ©
Ion-Induced Dipole Interactions and Fragmentation Times : C -C Chromophore Bond Dissociation Channel
The fragmentation times corresponding to the loss of the chromophore
(C-- C bond dissociation channel) after photoexcitation at 263
nm have been investigated for several small peptides containing tryptophan or
tyrosine. For tryptophan-containing peptides, the aromatic chromophore is lost
as an ionic fragment (m/z 130), and the fragmentation time increases with the
mass of the neutral fragment. In contrast, for tyrosine-containing peptides the
aromatic chromophore is always lost as a neutral fragment (mass = 107 amu) and
the fragmentation time is found to be fast (\textless{}20 ns). These different
behaviors are explained by the role of the postfragmentation interaction in the
complex formed after the C--C bond cleavage
What Counts as âWorld Classâ? : Global University Rankings and Shifts in Institutional Strategies
Global university rankings have emerged as a benchmark of institutional success, setting standards for higher education policymaking and institutional practices. Nevertheless, only a marginal share of higher education institutions (HEI) are in a realistic position to be ranked as a âworld-classâ institutions. In the European context, the global rankings have been used to highlight a performance gap between European and North American institutions. Here the focus has been on the HEIs in the top-100 positions, causing concerns over European higher education. This has also become a marker of world-class university. We analyze the strategies of 27 Northern European universities in different tiers to learn how they have adjusted to the reality of ranking. We conclude that the references to global rankings have increased between 2014 and 2018. At the same time, the references to rankings have become more implicit in nature. Nevertheless, we find that the discourse of global comparison and excellence has become more common in the strategies. There are also emerging references to the regional role of universities, which are apparent in the strategies of universities that are clearly outside the top-100 ranked institutions. However, this is also a reflection of the discourse of world-class university.Peer reviewe
[Autologous Venous Graft Disease - Incidence, Physiopathological Aspects and Therapeutic Means of Recovery of Graft]
Diagnostic de l'intoxication aiguë par les insecticides organophosphorés basés sur la détermination de l'activité cholinestérasique
Droughts in Amazonia: Spatiotemporal Variability, Teleconnections, and Seasonal Predictions
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