Abstract: Provided is a polyimide insulation coating, which is prepared by reacting a diacid anhydride compound represented by Formula (I) with a diamine compound represented by Formula (II). By adopting the specific diacid anhydride compound and the specific diamine compound, the synthesized polyimide insulation coating can have a dielectric constant less than 3. Accordingly, the enameled wire having an insulation layer formed from the polyimide insulation coating would not readily produce partial discharge, thereby avoiding the penetrating short-circuit and the damage to the motor.

Abstract: The present invention provides a chemical compound having the structure being one selected from a group consisting of wherein R1 is one selected from a group consisting of COOCH3, COOCH2Ph, CONHCH(CH3)2 and CONHC6H5, R2 is one selected from a group consisting of H, CH3 and CH(CH3)2, R3 is one selected from a group consisting of H, CH3, CH(CH3)2 and CH2Ph, and R4 is one of CH(CH3)2 and C6H5.

Abstract: The present invention provides a chemical compound having the structure being one selected from a group consisting of wherein R1 is one selected from a group consisting of COOCH3, COOCH2Ph, CONHCH(CH3)2 and CONHC6H5, R2 is one selected from a group consisting of H, CH3 and CH(CH3)2, R3 is one selected from a group consisting of H, CH3, CH(CH3)2 and CH2Ph, and R4 is one of CH(CH3)2 and C6H5.

Abstract: A compound used to prevent diseases caused by aquaporin deficiency, which is 18?-Glycyrrhetinic acid derivative. Said compound can not only prevent diseases caused aquaporin deficiency, but be able to prevent aquaporin (AQP) production and enhance skin function. Since AQPs have many advantages in skin cells, e.g. promoting water and glycerine molecular transportation, increasing skin elasticity and cuticle moisture, increasing the cell proliferation and cell migration, aquaporin can promote skin bather function and wound cicatrization. Therefore, said compound can be applied potentially as a medicinal cosmetic in skin medicine cosmetology, or as a new medical composition to treat diseases caused by AQP abnormality, such as urine concentration defect, wound healing slow down, corneal re-epithelialization slow down and etc.

Abstract: A magnet wire has a conductor and a coating layer. The coated layer is coated around the conductor and has at least one magnetic coating layer; and at least one insulating coating layer. The magnetic coating layer has non-conductive magnetic material. The insulating coating layer and the magnetic coating layer are formed alternately. The alternative structure of the magnetic coating layer and the insulating coating layer prevent precipitation of magnetic material and efficiently offsets the interference between conductors after electricity is supplied, which inhibits occurrence of eddy current and lowers alternative current (AC) resistance.

Abstract: The present invention provides a chemical compound having the structure being one selected from a group consisting of wherein R1 is one selected from a group consisting of COOCH3, COOCH2Ph, CONHCH(CH3)2 and CONHC6H5, R2 is one selected from a group consisting of H, CH3 and CH(CH3)2, R3 is one selected from a group consisting of H, CH3, CH(CH3)2 and CH2Ph, and R4 is one of CH(CH3)2 and C6H5.

Abstract: A chip package including a substrate, a chip and a mark is provided. The substrate has a carrying surface. A mark region is disposed on the carrying surface. The chip is disposed on the carrying surface and electrically connected to the substrate. The mark is disposed in the mark region for recording a process parameter.

Abstract: A spiral wound type grip tape is provided. The spiral wound type grip tape includes an elastic strip and at least one flexible thread. The flexible thread is disposed in the elastic strip, such that the grip tape can be spirally wound on the surface of a grip. The spiral wound type grip tape can be easily installed on a grip, and can be applied to the grips of the golf clubs, baseball bats, or tennis rackets of sports equipment.

Abstract: A chip package including a substrate, a chip and a mark is provided. The substrate has a carrying surface. A mark region is disposed on the carrying surface. The chip is disposed on the carrying surface and electrically connected to the substrate. The mark is disposed in the mark region for recording a process parameter.

Abstract: A matching structure is proposed in the present invention. The matching structure is attached to an antenna resonant body and formed with a U shape, an L shape or a hat shape to completely or partially cover one end of the antenna resonant body. Thereby, the matching structure provides electromagnetic coupling with the antenna resonant body to increase the resonance bandwidth. Thus, the resonance bandwidth meets various practical requirements of bandwidth.