Data correlation, particle size scattering

In many industries, particle size measurements have been carried out historically by sieve analysis and light scattering instruments are increasingly replacing this. In order to correlate with historic data banks some manufacturers have software to manipulate the data so as to present the size distribution in terms of sieve diameter. 

Effects of Particle Size - The question of whether the methane oxidation is structure sensitive or structure insensitive has generated some controversy in the scientific literature. Some studies have demonstrated a strong dependence of activity on particle size. For example, Figure 1 summarizes literature data of the variation of turnover frequency (TOF) with Pd dispersion for catalysts preconditioned in He or H2. Despite some scattering in the data, a clear correlation is observed, indicating that the specific activity of Pd does in fact increase with particle size. ... 

Since permeability and particle size distributions appear to be correlated, the permeability data was plotted versus the volume of solution. Figure 10 illustrates that while scatter in the data exists, an obvious trend is observed that increasing the solution volume over the range examined increases permeability. 

Figure 28.28 Correlation of (a) the particle extinction coefficient at 308 nm, (b) the back-scatter coefficient at 308 nm, (c) the extinction-to-back-scatter DIAL ratio, (d) the effective radius of the particle size distribution, (e) the particle surface-area and (f) the mass concentrations the data were recorded on 4 April 1992. The lidar signal profiles are smoothed with a height window of 600 m for the back-scatter coefficient and 2500 m in all other cases the error bars indicate the overall retrieval error. The optical depth of the stratospheric aerosol layer was 0.25. The dashed line indicates the tropopause. Adapted from Ansmann et al, J. Atmos. Sci., 1997, 54 2630, with permission ofthe American Meteorological Society...

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