In basketball competition, with the application of perpendicular principle or by the analysis of the defending position established by the other team s defending memberand the circumstance of both parties team member s body touch ,we can judge if it is to bump the other with the ball or if the defending member violates the rules.

The effect of upper tropospheric perturbation PV on the development of the South-West Meso-cyclogenesis is discussed on Hoskins PV Principle in terms of conservation of PV on isobaric surface and humid isentropic PV.