Abstract: A method for parameterization of a vehicle collision includes obtaining a first outline of a first vehicle; obtaining a second outline of a second object participating in the collision with the first vehicle; modeling a collision between the first vehicle and the second object on the basis of the relative movement of the first and second outlines, wherein in the relative movement, the first and second outlines overlap at least along part of the relative movement; determining the parameterization on the basis of the overlapping extent of the outlines.

Abstract: An apparatus for injecting a gaseous medium into a flowing liquid medium consisting of a first pipe having a closed end facing against the direction of the flowing liquid and an open end disposed in the direction of liquid flow, a second pipe coaxially disposed with the first pipe and having an open end extending through the closed end of the first pipe and a closed end inside the first pipe and a plurality of elongate apertures in its periphery adjacent the closed end and a substantially rectangular pipe entering the first pipe at an acute angle to introduce liquid into an annular gap between the first and second pipe in a substantially helical flow pattern traversing the elongate apertures thereby to draw air from the second pipe through the elongate apertures into the liquid.

Abstract: An apparatus for injecting a gaseous medium into a flowing liquid medium consisting of a first pipe having a closed end facing against the direction of the flowing liquid and an open end disposed in the direction of liquid flow, a second pipe coaxially disposed with the first pipe and having an open end extending through the closed end of the first pipe and a closed end inside the first pipe and a plurality of elongate apertures in its periphery adjacent the closed end and a substantially rectangular pipe entering the first pipe at an acute angle to introduce liquid into an annular gap between the first and second pipe in a substantially helical flow pattern traversing the elongate apertures thereby to draw air from the second pipe through the elongate apertures into the liquid.