Abstract: The method for co-sintering transformer includes the following steps: a preparation step providing a copper conductor strip and an iron core; a coating step applying a layer of nickel coating, or a layer of precious metal coating, or both on the copper conductor strip from the preparation step; an assembly step putting the copper conductor strip from the coating step and the iron core from the preparation step together to form a transformer; a pressing step pressing the assembled copper conductor strip and the iron core from the assembly step, together with iron power, in a mold into an integrally formed transformer; and a sintering step sintering the pressed transformer from the pressing step in an atmospheric environment. The present method is able to conduct sintering directly under the atmospheric environment without reducing oxygen content. Iron powder also exhibits improved characteristics after sintering in the atmospheric environment.

Abstract: The present disclosure relates to a tooth brightening composition comprising polyurethane, at least one white food colours and at least one blue food colours and optionally other orally acceptable carriers and/or excipients. The present disclosure also provides a tooth brightening kit and a tooth brightening method with the tooth brightening composition.

Abstract: The invention provides a light emitting sensing device and a manufacturing method thereof. The light emitting sensing device comprises: a non-translucent substrate having a first surface with at least one recess formed on the first surface; a light emitting element disposed in the at least one recess; a light sensing element disposed on the first surface; a first transparent material disposed in the at least one recess and covering the light emitting element; and a second transparent material disposed on the first surface and covering the light sensing element. The light emitting sensing device provided in this embodiment solves the problem in the prior art, the infrared light emitted by the light emitting chip irradiates into the sensing chip and causes the sensing chip to be interfered by the light of the light emitting chip resulting in reduced sensing accuracy.

Abstract: The invention includes a wheel speed detector, disposed beside a wheel of the bicycle for detecting a rotational speed of the wheel; a crankset forward rotation detector, disposed beside a crankset of the bicycle for detecting forward rotational speed of the crankset; a control module, attached on a handle bar of the bicycle, having a display, an operation interface and a program, and electrically connected to the wheel speed detector and the crank forward rotation detector for receiving sensing signals therefrom and outputting control signals; a gear change driver, electrically connected to the control module for receiving the control signals and driving at least one derailleur of the bicycle to change gears; and a power supply, having a battery to supply electric power to the automatic transmission system.