Abstract: A self-powered automobile exhaust gas sensor including a supporting frame, a ferroelectric-triboelectric coupling functional film, and two metal electrodes. The ferroelectric-triboelectric coupling functional film comprises a first end fixed on the supporting beam in middle of the supporting frame, and a second end is freestanding. The two metal electrodes are grounded and adhered on the upper and lower sides of the supporting frame, respectively. An iron block is mounted on the top of the supporting frame.

Abstract: A self-powered automobile exhaust gas sensor including a supporting frame, a ferroelectric-triboelectric coupling functional film, and two metal electrodes. The ferroelectric-triboelectric coupling functional film comprises a first end fixed on the supporting beam in middle of the supporting frame, and a second end is freestanding. The two metal electrodes are grounded and adhered on the upper and lower sides of the supporting frame, respectively. An iron block is mounted on the top of the supporting frame.

Abstract: The present invention discloses an innovative preparation process for recombinant human fat cell peptide (BMP-2 stem cells for short), comprising the following steps: gene synthesis of BMP-2 stem cells, specific expression system construction of mature peptide, expression induction, separation, purification and amplification. The method disclosed by the present invention is simple and flexible; has simple product separation and purification process, high purity, high activity and low production cost; has the functions of preventing clinical virus, resisting cell aging, and promoting wound healing and repair in epidermis, dermis and mucosa; and has broad application prospects in the fields such as medical care, cosmetology and health care.