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:

In the LWR model the characteristic speed vanishes exactly at the

critical density where the traffic flow changes from free flow to congested flow.

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.

One can observe that the network speed is greatly influenced by the maximum vehicle speed when the network density is lower than a

critical density. However, the influence will be weak when the network density exceeds the

critical density.

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].

Although many of the essays in this collection rehearse ideas or theoretical assumptions that we are familiar with from postcolonial and British cultural studies, by recasting these ideas and assumptions via new or different texts and contexts they expand the persuasive force and

critical density of the scholarship to which they are themselves indebted.

It has been suggested that branching is induced when the concentration of tip growth vesicles reaches a

critical density at the apex (Trinci 1974).