Abstract: A photo-detecting device includes a first semiconductor layer with a first dopant, a light-absorbing layer, a second semiconductor layer, and a semiconductor contact layer. The second semiconductor layer is located on the first semiconductor layer and has a first region and a second region, the light absorbing layer is located between the first semiconductor layer and the second semiconductor layer and has a third region and a fourth region, the semiconductor contact layer contacts the first region. The first region includes a second dopant and a third dopant, the second region includes second dopant, and the third region includes third dopant. The semiconductor contact layer has a first thickness greater than 50 ? and smaller than 1000 ?.

Abstract: A handlebar stem coupling module for a bicycle which includes a steerer tube, and a handlebar stem having a compression connector formed on one distal end thereof. The handlebar stem coupling module includes an urging sleeve securely mounted between an outer wall of the steerer tube and an inner wall of the compression connector, and an elongated slit laterally defined in the urging sleeve and extending along a length thereof.

Abstract: An inversion practice exerciser includes a base member including a horizontal beam and two side beams each attached to one distal end of the horizontal beam. A pair of handgrip members are each mounted on a corresponding one of the two side beams. A pair of upright members are mounted on the base member and each includes a lower post and an upper post pivotally engaged with each other. A pair of shoulder supporting members are each mounted on a corresponding one of the two upper posts and each have a buffer pad mounted thereon. A pair of buffer pads are mounted around an upper end portion of a corresponding one of the two upper posts.