Browsing by Subject "QUEST"

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  • Sipilä, M.; Sarnela, N.; Jokinen, T.; Junninen, H.; Hakala, J.; Rissanen, M. P.; Praplan, A.; Simon, M.; Kürten, A.; Bianchi, F.; Dommen, J.; Curtius, J.; Petäjä, T.; Worsnop, D.R. (2015)
    Atmospheric amines may play a crucial role in formation of new aerosol particles via nucleation with sulfuric acid. Recent studies have revealed that concentrations below 1 pptV can significantly promote nucleation of sulfuric acid particles. While sulfuric acid detection is relatively straightforward, no amine measurements to date have been able to reach the critical sub-pptV concentration range and atmospheric amine concentrations are in general poorly characterized. In this work we present a proof-of-concept of an instrument capable of detecting dimethyl amine (DMA) with concentrations even down to 70 ppqV (parts per quadrillion, 0.07 pptV) for a 15 min integration time. Detection of ammonia and amines other than dimethyl amine is discussed. We also report results from the first ambient measurements performed in spring 2013 at a boreal forest site. While minute signals above the signal-to-noise ratio that could be attributed to trimethyl or propyl amine were observed, DMA concentration never exceeded the detection threshold of ambient measurements (150 ppqV), thereby questioning, though not excluding, the role of DMA in nucleation at this location.
  • Clarke, Kris (2022)
    Contextualizing disciplinary histories through the personal stories of forerunners creates compelling narratives of the craft of evolving professions. By looking to our intellectual and practitioner ancestors, we participate in a dialogue with a history that shapes our contemporary professional identities and aspirations for the future. Grounded in a decolonizing approach to social work, this article examines how the discipline shapes its professional identity and ways of knowing by centering the role of canonical founders in the social work curriculum. The global social work origin story in the curriculum often centers on Anglo-American ancestors that illustrate the development of the disciplinary boundaries of the international profession. One method of decolonizing social work epistemology at the intersection of ancestors and professional lineage could be to look to public history as a pedagogical tool in the curriculum. The article concludes by examining the use of podcasts as having the potential to decolonize the process of collecting, analyzing, and disseminating local knowledge of ancestors thus challenging the top-down approach to expert-driven epistemologies.