Using informative priors in the estimation of mixtures over time with   application to aerosol particle size distributions
  The issue of using informative priors for estimation of mixtures at multiple time points is examined. Several different informative priors and an independent prior are compared using samples of actual and simulated aerosol particle size distribution (PSD) data. Measurements of aerosol PSDs refer to the concentration of aerosol particles in terms of their size, which is typically multimodal in nature and collected at frequent time intervals. The use of informative priors is found to better identify component parameters at each time point and more clearly establish patterns in the parameters over time. Some caveats to this finding are discussed. 
Darren Wraith, Kerrie Mengersen, Clair Alston, Judith Rousseau, Tareq   Hussein
stat.AP