Abstract: A silica-encapsulated nano-phase change material and its preparation method are provided. An n-octadecane SiO2 nanoscale phase change material is prepared by sol-gel and microemulsion coupling under alkaline conditions using silica as the shell material and n-octadecane as the core material in a microcapsule and using ethyl n-silicate as the silica source, cetyltrimethylammonium bromide as the emulsifier, and water and ethanol as the solvents. The materials prepared have a particle size of about 500 nm, a phase transition temperature of 27.7° C., a latent heat of phase transition of 159.74 J/g, and an elevated thermal decomposition temperature of 50° C. increase compared with that of the existing n-octadecane.

Abstract: Provided is a lamp unit, a connector, and a lamp system having the lamp unit that includes a lamp panel, a connector having a rotating shaft, and a first connection portion and a second connection portion each being sleeved on the rotating shaft in a hinge form and being rotatable relative to each other around the rotating shaft, and connection ports detachably snap-fitted with one of the first connection portion and the second connection portion. The relative angle between the first connection portion and the second connection portion can be adjusted after the lamp units are connected in a three-dimensional manner via the connectors. In addition, one of the first connection portion and the second connection portion of each connector is detachably snap-fitted with a connection port of each lamp unit, which can make the connection between the lamp units more secure while ensuring convenient assembly and disassembly.

Abstract: A light-emitting diode includes a semiconductor light-emitting stack and a distributed Bragg reflector (DBR) structure. The semiconductor light-emitting stack has a first surface and a second surface opposite to each other. The DBR structure is disposed on one of the first surface and the second surface of the semiconductor light-emitting stack, and includes at least one set of first light-transmitting layers and at least one set of second light-transmitting layers stacked on each other in the first direction. The first light-transmitting layers has interface roughness greater than that of the second light-transmitting layers.

Abstract: A composite reflective structure includes at least one dielectric multilayer element which includes a first dielectric layer having a first refractive index, a second dielectric layer having a second refractive index, and a stress buffer layer interposed therebetween. The first refractive index is greater than the second refractive index. Also disclosed herein is a light-emitting diode chip including the abovementioned composite reflective structure and a light-emitting diode device including the light-emitting diode chip.

Abstract: A computer aided design system for pulsed extraction column operation process is provided, including a data input module, a data detection module, a computing module, a computing result detection module, and an error data management module. The data input module is connected with the data detection module, the data detection module is connected with the computing module, the computing module is connected with the computing result detection module, and the error data management module is connected with the data detection module and the computing result detection module. The system of the present invention is capable of computing and displaying the concentration changes of the corresponding components during operation process in real time, and reporting abnormal conditions which may arise during operation process. After the system is running, the results themselves are stored in the storage unit, which is convenient for user's analyzing and processing operating results under different conditions.