In (4), [v.sub.f,i] is free flow speed and [[rho].sub.c,i] represents
critical density, which is the density associated with capacity.
In our model the DE density equals the
critical density reduced by the ratio of the squares of the Hubble and event horizons radii (24), having the value in good agreement with the observational data.
According to the Planck mission (PM) 2015 results [10], it seems that the universe has
critical density:
We define [[rho].sub.c] as the
critical density, corresponding to the microvilli so dense that they form a new surface inside the vessel walls (Figure 4).
In [28], Gilbert firstly raised the concept of continuum percolation to find the
critical density of a Poisson point process.
At CMB both temperature and density of C[H.sub.4] are, respectively, 4000[degrees]C and 8.8 g/[cm.sup.3] while
critical density is 0.162 g/[cm.sup.3] and critical temperature is only 48[degrees]C.
Quorum sensing allows bacteria to change their behaviour after reaching a
critical density. For example, at high densities, the bacterium Vibrio fischeri, which lives on the skin of squid, starts glowing, helping to camouflage the squid, but V.
Finally, we will demonstrate that there are graph classes such that there a exists a
critical density co where the category to which a random graph with cn edges belongs to is different for c > [c.sub.o] and c < [c.sub.o].
It has been suggested that branching is induced when the concentration of tip growth vesicles reaches a
critical density at the apex (Trinci 1974).