Abstract: A light-emitting device preparation method includes: preparing one or more functional layers on a first electrode; preparing a second electrode on the one or more functional layers; wherein, at least one of the one or more functional layers is obtained by subjecting a solution of the corresponding functional layer material to a first thermal annealing treatment and then a second thermal annealing treatment.

Abstract: A single-phase permanent magnet synchronous motor and dust collector. The single-phase permanent magnet synchronous motor includes a plurality of stator teeth, the plurality of stator teeth include at least: a first-type and second-type stator tooth; the first-type and second-type stator teeth enclose an annular working cavity for accommodating a rotor part, where the size of a central angle corresponding to a first contour line of an end face of the first-type stator tooth facing the rotor part is different from the size of a central angle corresponding to a second contour line of an end face of the second-type stator tooth facing the rotor part. The motor has a significantly reduced cogging torque, a greatly reduced torque ripple, and an obviously increased motor output torque. The single-phase permanent magnet synchronous motor is small in size, light in weight, simple in structure, convenient for large-scale manufacture and low in manufacturing cost.

Abstract: The present disclosure belongs to the technical field of amniotic membrane, and in particular, relates to a porous biological amniotic membrane puncture device and a preparation method. The device includes a sliding table, a light-shielding frame, a base I, and a base II. The sliding table is provided with a first sliding groove; the light-shielding frame is slidably connected to the first sliding groove; a three-axis movable platform is disposed on the base I; the three-axis movable platform is fixedly connected to a laser puncture device; an upper end of the base II is fixedly connected to a fixed board surface; a middle portion of the fixed board surface is provided with an embedded groove; and an amniotic membrane sample is placed in the embedded groove.