Abstract: A photodetector device includes a plurality of Ge epilayers that are grown on a substrate and annealed in a defined temperature range. The Ge epilayers form a tensile strained Ge layer that allows the photodetector device to operate efficiently in the C-band and L-band.

Abstract: A safety guard rail apparatus includes a base fitting removably engaged with a lower portion of an upright post. A midrail fitting is removably engaged with a medial portion of the upright post and further removably engaged with a horizontal midrail. A toprail fitting is removably engaged with an upper portion of the upright post and further removably engaged with a horizontal toprail. The base, midrail and toprail fittings are engaged with the upright post, the midrail and toprail using common fasteners such as nails or screws. A corner fitting is adapted for receiving an end portion of each of two of the horizontal midrails or toprails. In this manner, a temporary guard rail may be constructed around elevated construction sites for worker safety.

Abstract: A binding for a water ski or a wake board (20) for use on a wake board (21). The binding for a water ski or a wake board (20) securely attaches the rider's foot to the wake board (21). The binding for a water ski or a wake board (20) includes a holster (22) made of a semi-rigid material and that extends on opposite sides of the foot of the rider so as to close over the foot. A liner sock (24) extends over the foot of the rider and underneath the holster (22) and upward so as to receive the ankle and heel of the rider. A stretchable strap (26) extends from the bottom of the binding for a water ski or a wake board (20) and includes an annular cuff (24) that is fastenable about the ankle of the rider. The stretchable strap (26) permits a solid connection of the rider's ankle to the wake board (20), but stretches to release the rider's ankle and foot upon a fall. A buckle (66) extends over the holster (22) and includes a stretchable strap (68).