To describe a homogeneous atmospheric medium related to UV communication, we adopt the following coefficients [1, 26]: the Rayleigh (molecular) scattering coefficient, Mie (aerosol) scattering coefficient, absorption coefficient, and extinction coefficient.
When the molecular diffusion coefficient (diffusion coefficient) is used for thermometry, it often takes 2 to 3 min to obtain an image, which is too slow for real-time monitoring.
In a previous study, column experiments were carried out with Toyoura sand (permeability 2.05 × 10− 11 m2) and Toyoura sand mixed with bentonite (permeability 9.96 × 10− 13 m2) to obtain the molecular diffusion coefficient, the Knudsen diffusion coefficient, the tortuosity for the molecular diffusion coefficient, and the mechanical dispersion coefficient of soil gas systems.
Laboratory experiments to estimate the effective molecular diffusion coefficient (De) and sorption coefficient (Kd) for volatile organic compounds through natural clayey soils were conducted using diffusion testing apparatus.
Another study showed a significant decrease of both pure molecular diffusion coefficient (Dslow) and perfusion-related diffusion coefficient (Dfast) in the advanced fibrosis group compared to nonadvanced fibrosis group (P < 0.05 and P < 0.01, resp).
This allows the determination of several different parameters, namely: D, the true molecular diffusion coefficient; D*, the perfusion-related fast diffusion coefficient, which correlates with blood flow; and f, the perfusion fraction, which is linked to the blood volume within tissue [18, 27, 28, 29].
It includes molecular inbreeding coefficients, ROH inbreeding coefficients [ 10– 19, 28, 29] and coefficients that make use of the length of ROH as a random variable with an associated probability distribution or probability density function, as proposed in this paper.
The hydrodynamic state in the columns impacts on the molecular diffusion coefficient (the well known hydrodynamic dispersion phenomenon) but also in a similar way on the thermal diffusion coefficient, and the existence of a thermodiffusive counterpart to hydrodispersion is probable.
Molecular diffusion coefficient (L2 T−1).
Molecular diffusion coefficient.
