Abstract: A combined sealing member for a coiled tubing blowout preventer box includes an upper plate, a first main sealing body, a second main sealing body and a lower plate that are disposed in sequence from top to bottom and are each provided with a through hole allowing a coiled tubing to pass therethrough. The upper plate is composed of two upper plate units that are separable half-and-half. The first main sealing body is composed of two first main sealing body units that are separable half-and-half. The second main sealing body is composed of two second main sealing body units that are separable half-and-half. The lower plate is composed of two lower plate units that are separable half-and-half. The first main sealing body has a hardness greater than that of the second main sealing body and a height smaller than that of the second main sealing body.

Abstract: The present invention provides a method for forming a graphene film through horizontally tiling and self-assembling graphene, including: proportionally adding toluene and alcohol into a graphene aqueous solution to be fully and uniformly mixed; then pouring the mixture into a vacuum filtration device, wherein when a solution in a filter flask forms a layered solution system with upper and lower layers, graphene is confined at an interface and tiled horizontally under a shear force at the interface to allow (002) planes of graphene to gradually become parallel to the interface, and graphene to be self-assembled to form the graphene film; and activating the suction filtration device to remove the solution, to obtain a graphene film with the (002) planes parallel to each other at a microscopic level on a filter paper.

Abstract: A method for forming a photovoltaic device comprising the steps of: providing a first conductive material on a substrate; depositing a continuous layer of a dielectric material less than 10 nm thick on the first conductive material; annealing the first conductive material and the layer of dielectric material; forming a chalcogenide light-absorbing material on the layer of dielectric material; and depositing a second material on the light-absorbing material such that the second material is electrically coupled to the light-absorbing material; wherein the first conductive material and the dielectric material are selected such that, during the step of annealing, a portion of the first conductive material undergoes a chemical reaction to form: a layer of a metal chalcogenide material at the interface between first conductive material and the dielectric material; and a plurality of openings in the layer of dielectric material; the openings being such to allow electrical coupling between the light-absorbing materia

Abstract: The present invention provides a method for forming a graphene film through horizontally tiling and self-assembling graphene, including: proportionally adding toluene and alcohol into a graphene aqueous solution to be fully and uniformly mixed; then pouring the mixture into a vacuum filtration device, wherein when a solution in a filter flask forms a layered solution system with upper and lower layers, graphene is confined at an interface and tiled horizontally under a shear force at the interface to allow (002) planes of graphene to gradually become parallel to the interface, and graphene to be self-assembled to form the graphene film; and activating the suction filtration device to remove the solution, to obtain a graphene film with the (002) planes parallel to each other at a microscopic level on a filter paper.

Abstract: A method for forming a photovoltaic device comprising the steps of: providing a first conductive material on a substrate; depositing a continuous layer of a dielectric material less than 10 nm thick on the first conductive material; annealing the first conductive material and the layer of dielectric material; forming a chalcogenide light-absorbing material on the layer of dielectric material; and depositing a second material on the light-absorbing material such that the second material is electrically coupled to the light-absorbing material; wherein the first conductive material and the dielectric material are selected such that, during the step of annealing, a portion of the first conductive material undergoes a chemical reaction to form: a layer of a metal chalcogenide material at the interface between first conductive material and the dielectric material; and a plurality of openings in the layer of dielectric material; the openings being such to allow electrical coupling between the light-absorbing materia

Abstract: The present invention provides an invisible orthodontic appliance with a molar distalization device, comprising an orthodontic invisible aligner, and further comprising a molar distalization device arranged on the orthodontic invisible aligner, wherein the molar distalization device comprises a lip bumper arranged just in front of the orthodontic invisible aligner close to the lip side, and a connector connected with the lip bumper, and the end of the connector is connected to the molar position of the orthodontic invisible aligner. The end of the connector forms a U-shaped structure and the tail end of the U-shaped structure is connected to the molar position of the orthodontic invisible aligner. The novel orthodontic appliance provided by the present invention has the advantages of ensuring the attractiveness and greatly improving the orthodontic effect, improving the orthodontic speed and shortening the service cycle of the aligner.

Abstract: The present invention provides an invisible orthodontic appliance with a molar distalization device, comprising an orthodontic invisible aligner, and further comprising a molar distalization device arranged on the orthodontic invisible aligner, wherein the molar distalization device comprises a lip bumper arranged just in front of the orthodontic invisible aligner close to the lip side, and a connector connected with the lip bumper, and the end of the connector is connected to the molar position of the orthodontic invisible aligner. The end of the connector forms a U-shaped structure and the tail end of the U-shaped structure is connected to the molar position of the orthodontic invisible aligner. The novel orthodontic appliance provided by the present invention has the advantages of ensuring the attractiveness and greatly improving the orthodontic effect, improving the orthodontic speed and shortening the service cycle of the aligner.