Abstract: Rotary positive displacement machines based on trochoidal geometry and including a helical rotor that undergoes planetary motion relative to a helical stator can be designed and configured so that the axial load or rotor pressure force is positive, negative, or neutral. In some embodiments, a change in axial load, caused by a change in differential pressure across the machine, can be used to trigger a change in a mechanical configuration of the machine.

Abstract: Methods are provided for increasing shots-made frequency by educating a player's eye and memory through repetitions at one or more specified distance locations from a basketball hoop. In one aspect, a shooter must make a first plurality of shots at a first location at a threshold success frequency in order to advance to a second location. Thresholds may be selected from previous success or other data input. Divergent thresholds or shot set total numbers may be provided for different shot locations. In one aspect, shooting locations are defined by a plurality of spaced markings applied to a court surface and are arrayed in radial lines. In one aspect, verification is provided with regard to meeting a shooting threshold.

Abstract: A method and system are provided for increasing shots-made frequency by educating a player's eye and memory through repetitions at one or more specified distance locations from the basketball hoop, and then building on that information by progressively increasing the distance from the hoop through sequential steps to additional sets of repetitions taken at greater distances from the hoop. In one aspect, a shooter must make a first plurality of shots at a threshold success frequency to advance to a second location. Thresholds may be selected from previous success or other data input; divergent thresholds or shot set total numbers for shot locations. In one aspect, the plurality of markings are arrayed in a plurality of radial lines. In one aspect a second party verifies that a shooter meets at least one threshold.