β-Ga 2 O 3 nanorods were successfully fabricated through annealing Ga2O3/Mo films deposited on the Si (111) substrate by radio frequency magnetron sputtering technique. The morphology and structure of the as-synthesized nanorods were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-rays spectroscopy. The results show that the formed nanorods are single-crystalline Ga 2 O 3 with monoclinic structure. The diameters of nanorods are 200 nm and lengths typically up to several micrometers. A photoluminescence spectrum at room temperature under excitation at 325 nm exhibits two strong blue-light peaks located at about 413.0 nm and 437.5 nm, attributed to the recombination of bound electron-hole exciton in β-Ga 2 O 3 single crystal. The growth process of the β-Ga 2 O 3 nanorods is probably dominated by conventional vapor-solid mechanism.

Golf has become an increasingly popular sport. Determination of motion parameters of golf<br />ball can give quantitative suggestion for players. This paper introduces the principles of determination<br />based on Doppler radar. The parameters of golf motion to be measured include velocity, angle, spin<br />angular velocity and position. A golf realtime tracking system is designed with one transmitting antenna<br />and three receiving antennas in this paper. Simulations validate the feasibility and high accuracy<br />of this system. This system makes referential significance for golf realtime tracking system.