The present invention provides a nitride semiconductor light emitting device with an active layer of the multiple quantum well structure, in which the device has an improved luminous intensity and a good electrostatic withstanding voltage, thereby allowing the expanded application to various products. Specifically, the invention has an inner frame and outer frame associated by load bars connected to the computer. Alternate methods may include first placing the binder composition on the moving conveying belt and then applying the particles to the binding composition to form the moving mass. The sampling strip is then typically sealingly packaged and stored until its analysis. The pull-out roller blind is also provided for covering the roof screen.