Recent Submissions

  • Perspective Charts 

    MacTavish, Mia; Etemad, Katayoon; Samavati, Faramarz; Willett, Wesley (Science, Computer Science, University of Calgary, acceptedVersion, 2021-05-27)
    We introduce three novel data visualizations, called perspective charts, based on the concept of size constancy in linear perspective projection. Bar charts are a popular and commonly used tool for the interpretation of ...
  • Real-time vapor detection of nitroaromatic explosives by catalytic thermal dissociation blue diode laser cavity ring-down spectroscopy 

    Taha, Youssef M.; Odame-Ankrah, Charles A.; Osthoff, Hans D. (Elsevier, Science, Chemistry, University of Calgary, https://www.elsevier.com/journals/chemical-physics-letters/0009-2614/open-access-options, acceptedVersion, 2013-07-24)
    A compact blue diode laser catalytic thermal dissociation cavity ring-down spectrometer (cTD–CRDS) to detect vapors of nitroaromatic explosives is described. The instrument uses heated platinum(IV) oxide catalyst to convert ...
  • Heterogeneous formation of nitryl chloride and its role as a nocturnal NOx reservoir species during CalNex‐LA 2010 

    Mielke, L. H.; Stutz, J.; Tsai, C.; Hurlock, S. C.; Roberts, J. M.; Veres, P. R.; Froyd, K. D.; Hayes, P. L.; Cubison, M. J.; Jimenez, J. L.; Washenfelder, R. A.; Young, C. J.; Gilman, J. B.; Gouw, J. A.; Flynn, J. H.; Grossberg, N.; Lefer, B. L.; Liu, J.; Weber, R. J.; Osthoff, H. D. (American Geophysical Union, Science, Chemistry, University of Calgary, https://www.agu.org/Publish-with-AGU/Publish/Author-Resources/Policies/Permission-policy, publishedVersion, 2013-08-29)
    The nocturnal conversion of dinitrogen pentoxide (N2O5) to nitryl chloride (ClNO2) on chloride-containing aerosol can be a regionally important NOx (= NO + NO2) recycling and halogen activation pathway that affects oxidant ...
  • A gas chromatograph for quantification of peroxycarboxylic nitric anhydrides calibrated by thermal dissociation cavity ring-down spectroscopy 

    Tokarek, T. W.; Huo, J. A.; Odame-Ankrah, C. A.; Hammoud, D.; Taha, Y. M.; Osthoff, H. D. (European Geosciences Union, Science, Chemistry, University of Calgary, publishedVersion, 2014-10-01)
    The peroxycarboxylic nitric anhydrides (PANs, molecular formula: RC(O)O2NO2) can readily be observed by gas chromatography (PAN-GC) coupled to electron capture detection. Calibration of a PAN-GC remains a challenge, because ...
  • Comparison of negative-ion proton-transfer with iodide ion chemical ionization mass spectrometry for quantification of isocyanic acid in ambient air 

    Woodward-Massey, Robert; Taha, Youssef M.; Moussa, Samar G.; Osthoff, Hans D. (Elsevier, Science, Chemistry, University of Calgary, https://www.elsevier.com/journals/atmospheric-environment/1352-2310/open-access-options, acceptedVersion, 2014-09-06)
    Isocyanic acid (HNCO) is a trace gas pollutant of potential importance to human health whose measurement has recently become possible through the development of negative-ion proton-transfer chemical ionization mass ...
  • Efficient photochemical generation of peroxycarboxylic nitric anhydrides with ultraviolet light-emitting diodes 

    Rider, N. D.; Taha, Y. M.; Odame-Ankrah, C. A.; Huo, J. A.; Tokarek, T. W.; Cairns, E.; Moussa, S. G.; Liggio, J.; Osthoff, H. D. (European Geosciences Union, Science, Chemistry, University of Calgary, publishedVersion, 2015-07-08)
    Photochemical sources of peroxycarboxylic nitric anhydrides (PANs) are utilized in many atmospheric measurement techniques for calibration or to deliver an internal standard. Conventionally, such sources rely on phosphor-coated ...
  • I/O Bits: User-Driven, Situated, and Dedicated Self-Tracking 

    Wannamaker, Kendra; Kollannur, Sandeep; Dörk, Marian; Willett, Wesley (Association for Computing Machinery, Science, Computer Science, University of Calgary, University of Southern California, University of Applied Sciences Potsdam, https://authors.acm.org/author-resources/author-rights, acceptedVersion, 2021-06-28)
    We present I/O Bits, a prototype personal informatics system that explores the potential for user-driven and situated self-tracking. With simple tactile inputs and small e-paper visualizations, I/O Bits are dedicated ...
  • Biogenic Emissions and Nocturnal Ozone Depletion Events at the Amphitrite Point Observatory on Vancouver Island 

    Tokarek, T. W.; Brownsey, D. K.; Jordan, N.; Garner, N. M.; Ye, C. Z.; Assad, F. V.; Peace, A.; Schiller, C. L.; Mason, R. H.; Vingarzan, R.; Osthoff, H. D. (Taylor and Francis, Science, Chemistry, University of Calgary, acceptedVersion, 2017-04-11)
    Routine monitoring stations on the west coast of North America serve to monitor baseline levels of criteria pollutants such as ozone (O3) arriving from the Pacific Ocean. In Canada, the Amphitrite Point Observatory (APO) ...
  • Low levels of nitryl chloride at ground level: nocturnal nitrogen oxides in the Lower Fraser Valley of British Columbia 

    Osthoff, Hans D.; Odame-Ankrah, Charles A.; Taha, Youssef M.; Tokarek, Travis W.; Schiller, Corinne L.; Haga, Donna; Jones, Keith; Vingarzan, Roxanne (Copernicus Publications, Science, Chemistry, University of Calgary, https://www.nonlinear-processes-in-geophysics.net/policies/licence_and_copyright.html, publishedVersion, 2018-05-04)
    The nocturnal nitrogen oxides, which include the nitrate radical (NO3), dinitrogen pentoxide (N2O5), and its uptake product on chloride containing aerosol, nitryl chloride (ClNO2), can have profound impacts on the lifetime ...
  • Quantification of peroxynitric acid and peroxyacyl nitrates using an ethane-based thermal dissociation peroxy radical chemical amplification cavity ring-down spectrometer 

    Taha, Youssef M.; Saowapon, Matthew T.; Assad, Faisal V.; Ye, Connie Z.; Chen, Xining; Garner, Natasha M.; Osthoff, Hans D. (European Geosciences Union, Science, Chemistry, University of Calgary, publishedVersion, 2018-07-17)
    Peroxy and peroxyacyl nitrates (PNs and PANs) are important trace gas constituents of the troposphere which are challenging to quantify by differential thermal dissociation with NO2 detection in polluted (i.e., high-NOx) ...

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