Abstract: A method includes simplifying flowing of airflow at root of a rotor blade into flowing of free jet, and determining an airflow expansion angle according to Mach number of incoming flow at root of a stator vane; calculating a radial height difference between a first end point on a leading edge of a stator platform and a trailing edge of an adjacent rotor platform by using an axial distance thereof, the angle and a deviation coefficient; determining position of the first end point with radial height difference; determining intersection point of the leading edge and the stator platform as position of a second end point on the leading edge; and determining a profile line between the points by bridging spline curves, so that the tail end thereof is tangent to the intersection line, and the starting end thereof is kept on same plane as side wall of the leading edge.

Abstract: A method includes simplifying flowing of airflow at root of a rotor blade into flowing of free jet, and determining an airflow expansion angle according to Mach number of incoming flow at root of a stator vane; calculating a radial height difference between a first end point on a leading edge of a stator platform and a trailing edge of an adjacent rotor platform by using an axial distance thereof, the angle and a deviation coefficient; determining position of the first end point with radial height difference; determining intersection point of the leading edge and the stator platform as position of a second end point on the leading edge; and determining a profile line between the points by bridging spline curves, so that the tail end thereof is tangent to the intersection line, and the starting end thereof is kept on same plane as side wall of the leading edge.

Abstract: A golf bag transport device that is configured to assist in the transportation of a golf bag for a user during a round of play of golf. The present invention includes a base platform wherein the base platform includes drive wheels on opposing sides thereof. The base platform has a vertical golf bag support member extending upward therefrom. The vertical golf bag support member is further constructed to be collapsible. Secured to the vertical golf bag support member are horizontal support members configured to assist in retention of a golf bag. Opposing auxiliary wheels are located proximate the front edge and rear edge of the base platform. The auxiliary wheels are configured to assist in maintenance of the position of the base platform while traversing a sloped surface. Optical sensors are employed to provide collision avoidance and a gyroscopic balancing unit provides self-balancing of the device during use.

Abstract: An autonomous golf ball picking system configured to pick up golf balls from an outdoor environment. The system includes a route map defining a path to pick up golf balls from the ground. The route map is in a computer readable format. An unmanned ground vehicle having a base unit having an internal ball retention compartment, a ball picking roller configured to pick up golf balls from the ground and to deposit the picked-up golf balls into the internal ball retention compartment, at least two linked wheels, each of the at least two linked wheels driven by an independent motor and configured to move the unmanned ground vehicle around the ground, a battery to provide power to the unmanned ground vehicle, and an unmanned ground vehicle computer system. The computer system is capable of reading the route map and sending directional instructions to the independent motors in order to drive the unmanned ground vehicle along the path set out according to the route map.

Abstract: Apparatus and methods for self-cleaning of optical elements in sealed environments over a wide range of operating optical frequencies prevent long-term power degradation by introducing low-pressure backfill of a reactive gas such as oxygen into a vacuum chamber containing the optical elements. The backfill pressure is preferably between 10?4 torr and 10 torr, and generally between 0.1 torr and 2 torr at room temperature. The vacuum chamber may be continuously evacuated and backfilled, or may be sealed after evacuation and backfill is performed.

Abstract: All-optical quasi-phase matching (QPM) uses a train of counterpropagating pulses to enhance high-order harmonic generation (HHG) in a hollow waveguide. A pump pulse enters one end of the waveguide, and causes HHG in the waveguide. The counterpropagation pulses enter the other end of the waveguide and interact with the pump pulses to cause QPM within the waveguide, enhancing the HHG.

Abstract: All-optical quasi-phase matching (QPM) uses a train of counterpropagating pulses to enhance high-order harmonic generation (HHG) in a hollow waveguide. A pump pulse enters one end of the waveguide, and causes HHG in the waveguide. The counterpropagation pulses enter the other end of the waveguide and interact with the pump pulses to cause QPM within the waveguide, enhancing the HHG.