We demonstrate that at long times the rate of passive scalar decay in a turbulent, or simply chaotic, flow is dominated by regions where mixing is less efficient. We examine two situations. The first is of a spatially homogeneous stationary turbulent flow with both viscous and inertial scales present. It is shown that at large times scalar fluctuations decay algebraically in time at all spatial...

Room impulse responses can be analysed to yield several room acoustical parameters, such as reverberation time, early decay time, clarity index and strength factor. Despite the considerable noise immunity of modern impulse response measurement techniques (such as swept sinusoids), it is common for room impulse responses to have sufficient noise to have some effect on the derived room acoustical...

Numerical simulations of a dissipative hard sphere gas reveal a dependence of the cooling rate on correlation of the particle velocities due to inelastic collisions. We propose a coefficient which characterizes the velocity correlations in the two-particle velocity distribution function and express the temperature decay rate in terms of this coefficient. The analytical results are compared with...

the paper demonstrates the result of changes in the physicochemical and biological properties in soil as a result of the operation of illegal dumping sites. soil was sampled from the research points located on the outskirts of the city of bydgoszcz (poland) from the site not affected by illegal dumping sites (control c), within the dumping sites, having removed the waste layer (w), and 10 m awa...

the aim of study was to evaluate qualitative and quantitative characteristics of old trees in pattom and namkhaneh districts in the nowshahr, northern iran. the trees quantitative characteristics of dbh, total height, slenderness coefficient, trunk height, crown length, buttress height, and canopy cover area and qualitative characteristics of crown and trunk, i.e., health, vitality, and concurr...