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Sökning: WFRF:(Ojdanic A.)

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1.
  • Yan, C., et al. (författare)
  • Size-dependent influence of NOx on the growth rates of organic aerosol particles
  • 2020
  • Ingår i: Science Advances. - : American Association for the Advancement of Science (AAAS). - 2375-2548. ; 6:22
  • Tidskriftsartikel (refereegranskat)abstract
    • Atmospheric new-particle formation (NPF) affects climate by contributing to a large fraction of the cloud condensation nuclei (CCN). Highly oxygenated organic molecules (HOMs) drive the early particle growth and therefore substantially influence the survival of newly formed particles to CCN. Nitrogen oxide (NOx) is known to suppress the NPF driven by HOMs, but the underlying mechanism remains largely unclear. Here, we examine the response of particle growth to the changes of HOM formation caused by NOx. We show that NOx suppresses particle growth in general, but the suppression is rather nonuniform and size dependent, which can be quantitatively explained by the shifted HOM volatility after adding NOx. By illustrating how NOx affects the early growth of new particles, a critical step of CCN formation, our results help provide a refined assessment of the potential climatic effects caused by the diverse changes of NOx level in forest regions around the globe.
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2.
  • Ojdanic, A., et al. (författare)
  • Strengthening of a biodegradable Mg–Zn–Ca alloy ZX50 after processing by HPT and heat treatment
  • 2018
  • Ingår i: Magnesium Technology 2018. - Cham : Springer International Publishing. - 2367-1696 .- 2367-1181. - 9783319723310 ; Part F7, s. 277-282
  • Konferensbidrag (refereegranskat)abstract
    • This study investigates a biodegradable Mg–5Zn–0.3Ca alloy (ZX50) during HPT-processing and long-term heat treatments, the latter with respect to the evolution of intermetallic precipitates and vacancy clusters. Both the precipitates as well as the vacancy clusters achieve strength increases as the Zn atoms may act as potential trapping sites not only for HPT-induced dislocations but also vacancies. So far, overall increases of strength of up to 200% have been reached while keeping the Young’s modulus unchanged, thus representing an attractive improvement of mechanical properties for the actual alloy.
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