Abstract: Compressor rotor structure and methodology for harmonizing compressor aerodynamics and rotordynamics are provided. Disclosed embodiments benefit from a compressor design effective for improving rotordynamics (e.g., stiffer rotor structure) without reducing a usable aerodynamics range of the compressor. This design may involve variation of the rotor structure along the rotor axis to locate respective surfaces defined by respective inlets of the one or more impellers at a varying distance relative to the rotor axis based on respective ratios selected for the configuration of the impeller bodies. This arrangement may be effective for improving rotordynamics while satisfactorily meeting the respective varying aerodynamics requirements at the various compression stages by the impeller bodies.

Abstract: A portable gate assembly provides a portable enclosure that can fit any doorway in order to confine kids and pets to a desired area. The assembly includes a pair of spaced posts and a flexible net coupled to and extending between the posts. A sound emitter is coupled to the net. The sound emitter has a sensor positioned therein. The sound emitter is operationally coupled to the sensor wherein the sound emitter emits an audible indicator upon the sensor sending a proximity signal to the sound emitter when an object or a user is within a predetermined distance of the net.