Abstract: A cooling tower with a hydroelectric power generation unit includes a tower body, a water spraying device, and a water guiding plate, in addition to the hydroelectric power generation unit. The tower body has a water collection tank divided into a water-collecting tank area and a power-generating tank area. The water sprayed out by the water spraying device is guided by the water guiding plate into the water-collecting tank area. When the water-collecting tank area is full, the water in the water-collecting tank area flows into the power-generating tank area through the partition portion, or more particularly through the hydroelectric power generation unit, such that the hydroelectric power generation unit generates electricity from a difference in water level. By directly converting the potential energy of cooled cooling water into electric energy that can be stored or used, the cooling tower saves energy and contributes to environmental protection.

Abstract: An illumination system and a projection device comprising the same are provided. The projection device comprises an imaging system and the illumination system. The illumination system comprises a first light source, a color wheel and a reflecting mirror. The first light source provides a first wave band light along a first axial direction. The color wheel rotates around a second axial direction. The first axial direction is perpendicular to the second axial direction. A first wave band transforming area is formed around an edge of the color wheel, and the reflecting mirror is disposed adjacent to the edge of the color wheel. When being projected to the first wave band transforming area, the first wave band light is transformed into a second wave band light by the first wave band transforming area and then the second wave band light is reflected by the reflecting mirror.

Abstract: An illumination system for a projection device is provided. The illumination system comprises a light emitting element, a color wheel and at least one actuator. The light emitting element is adapted to generate a first wave band light, while the color wheel has a wheel disk and a plurality of wave band transforming areas formed on the wheel disk. The at least one actuator is connected to the color wheel to move the color wheel to a selected position so that the first wave band light is projected onto one of the wave band transforming areas to excite a plurality of selected wave band lights.

Abstract: A light emitting module and a display device comprising the light emitting module are provided. The light emitting module comprises an excitation light source, a phosphor wheel and a driving circuit. The excitation light source is configured to generate an excitation light. The phosphor wheel has a plurality of color segments and rotates at a period so that each of the color segments sequentially receives the excitation light to generate a color light. The driving circuit is electrically connected to the excitation light source and the phosphor wheel. The driving circuit is configured to provide a driving current to the excitation light source, and changes the driving current in accordance with each of the color segments receiving the excitation light so as to adjust an energy conversion efficiency of each of the color segments for generating the color light.

Abstract: A safety lighter includes a gas tank, a wheel racket, a file wheel assembly, and a metal cap. A wheel racket being provided at the top of the gas tank further includes two file-wheel seats having a slot extended up therefrom and a multiplicity of match-up seats. The file wheel assembly made by pressing together a file wheel with relatively smaller shaft diameter and two side wheels having external teeth at the circumference edge and with shaft diameter greater that that of the file wheel has its salient shaft pivotally connected to the slot. The metal cap being slipped on the external portion of the wheel racket has an extension portion provided at a location adjacent to the file wheel assembly.

Abstract: A self-locking disposable safety syringe includes a hollow barrel having a front open end, a rear open end and a flange formed on an inner face of the barrel, a plunger extendable into the barrel from the rear open end, a needle hub connecting assembly selectively movable in the barrel for securely engaging with a needle hub which is inserted into the barrel from the front end, the needle hub connecting assembly having an annular ring expandable in the barrel, and a press movably received in the barrel and securely connected to the needle hub connecting assembly to selectively expand the annular ring so as to position the needle hub connecting assembly in the barrel.