Abstract: A stereo projection screen including a scattering screen having a scattering structure layer, a phase retardation layer disposed between the scattering structure layer and the polarized projector, and a metal reflection layer covering at least a part of the scattering structure layer is provided. The scattering structure layer and the phase retardation layer are arranged in a first display area and a second display area of the stereo projection screen. The metal reflection layer is arranged in at least one of the first display area and the second display area. A first image light beam having a first polarization state has a second polarization state after being transmitted to the first display area and leaving the stereo projection screen. A second image light beam having the first polarization state still has the first polarization state after being transmitted to the second display area and leaving the stereo projection screen.

Abstract: An optoelectronic package and a method for producing the optoelectronic package are provided. The optoelectronic package includes a carrier, a photonic device, a first encapsulant and a second encapsulant. The photonic device is disposed on the carrier. The first encapsulant covers the carrier and is disposed around the photonic device. The second encapsulant covers the first encapsulant and the photonic device. The first encapsulant has a topmost position and a bottommost position, and the topmost position is not higher than a surface of the photonic device.

Abstract: A gentle start-up device includes: a rotational type hollow pipe body, including an inlet and an outlet, and having an inner wall provided with a plurality of bar-shaped fins; a transmission unit, physically connected to the rotational type hollow pipe body; and a driving unit, physically connected to the transmission unit for driving the transmission unit to rotate the rotational type hollow pipe body in a rotational direction and to achieve a predetermined rotational speed according to a water supply flow value of a water turbine of a hydraulic generator set, whereby water flow which passes through the rotational type hollow pipe body generates rotational flow.

Abstract: A gentle start-up device includes: a rotational type hollow pipe body, including an inlet and an outlet, and having an inner wall provided with a plurality of bar-shaped fins; a transmission unit, physically connected to the rotational type hollow pipe body; and a driving unit, physically connected to the transmission unit for driving the transmission unit to rotate the rotational type hollow pipe body in a rotational direction and to achieve a predetermined rotational speed according to a water supply flow value of a water turbine of a hydraulic generator set, whereby water flow which passes through the rotational type hollow pipe body generates rotational flow.

Abstract: A cooling apparatus includes a convoying unit and a spraying unit. The convoying unit includes a base and a plurality of rollers. The base includes a feeding end and a discharging end in which a convoying direction extends from the feeding end to the discharging end. The rollers are arranged on the base. Each roller includes a convoying portion. The convoying portion has a diameter which reduces from two ends to a center thereof. Each roller includes a shaft. The shaft has an axle direction which is at a diverted angle to the convoying portion. The diverted angle is 15° to 90°. The spraying unit includes at least one nozzle unit arranged between the feeding end and the discharging end. In this arrangement, a cooling operation can be performed on a rod-shaped steel material that is moving and rotating at the same time, attaining uniform and fast cooling effect.

Abstract: A method of heat treatment of a metal material is disclosed. The method of heat treatment includes heating the metal material to a first temperature through a heating fixture, and reducing the first temperature of the metal material to a second temperature through a cooling apparatus performing a fast cooling operation. The fast cooling operation has a high cooling speed of 80° C./sec to 200° C./sec. As such, the processed metal material can have the required mechanical properties.