Browsing by Author "Collins, John"

Now showing items 1-3 of 3

    • Calculations of Periodicity From H Alpha Profiles of Proxima Centauri 

      Collins, John (2017-01-25)
      In this report the stellar rotation signal for Proxima Centauri is investigated. High-resolution spectra taken with UVES and HARPS of Proxima Centauri over a 13-year period is used as well as photometric observations of ...

    • Calculations of periodicity from Halpha profiles of Proxima Centauri 

      Collins, John; Jones, Hugh; Barnes, John (2017-06-07)
      We investigate retrieval of the stellar rotation signal for Proxima Centauri. We make use of high-resolution spectra taken with UVES and HARPS of Proxima Centauri over a 13-yr period as well as photometric observations of ...

    • Hair analysis for the detection of drug use – is there potential for evasion? 

      Marrinan, Shanna; Roman-Urrestarazu, Andres; Naughton, Declan; Levari, Emerlinda; Collins, John; Chilcott, Robert; Bersani, Giuseppe; Corazza, Ornella (2017-06-28)
      BACKGROUND: Hair analysis for illicit substances is widely used to detect chronic drug consumption or abstention from drugs. Testees are increasingly seeking ways to avoid detection by using a variety of untested adulterant ...