Performing the Chemical Test by Reagent Strip The urine must be collected using appropriate technique and be tested within one hour ofcollection. If tests cannot be performed within this time, the specimen may be refrigerated for upto 8 hours.
Elastic and Inelastic Collisions. A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision. Any macroscopic collision between objects will convert some of the kinetic energy into internal energy and other forms of energy, so no large scale impacts are perfectly elastic.
5.1 Kinetic energy and vorticity budgets in 3D turbulence The mean zonal velocity is zero by deï¬nition of homogeneity and isotropy. The theory of 3D isotropic homogeneous turbulence is therefore a theory of the second order statistics of the velocity ï¬eld, i.e. the kinetic energy E â¡ 1 / 2 u 2 i.The angle brackets represent an ensemble average. In order to understand the energy balance of 3D ï¬ows, it is useful to derive the vorticity equation.e can deï¬ne a characteristic scale l B at which overturning is suppressed by the buoyancy stratiï¬cation as follows. The velocity associated with a particular length scale l in high Reynolds number isotropic 3D turbulence scales like, u 2 â¼ / 3 k â 2 / 3 ââ u â¼ (l) 1 / 3.