Characteristics and applications of Ⅲ-nitride light emitting diodes Principles and applications of light-emitting diode Characteristics and applications of dietary fiber inulin Characteristics and applications of porous nanomaterials Characteristics and application of throttling flowmeter 并列题名：Characteristics and applications of dietary fiber inulin Characteristics and applications for low-carbon catalytic combustion of natural gas Ecological characteristics and application of sulfate-reducing bacteria in oil field Key devices and applications of LED visible light communication