6results about How to "Avoid excessive erosion" patented technology

This disclosure relates to the photovoltaic field, providing a photovoltaic cell and its manufacturing method, as well as a photovoltaic module. The manufacturing method of the photovoltaic cell includes: placing a substrate in a support structure, at least one surface of the substrate including a plurality of mutually spaced first regions, the first regions being located at the edges of the surface; forming a semiconductor layer on the surface; performing a diffusion process on the semiconductor layer to convert the semiconductor layer into a doped layer, and forming a protective layer on the side of the doped layer away from the substrate; wherein, in the step of forming the semiconductor layer, nitrogen gas and silane are introduced into a reaction chamber used to prepare the semiconductor layer, and the ratio of the nitrogen gas flow rate to the silane gas flow rate is controlled to be 0.7~1; and / or, the diffusion process includes sequentially performed oxygen-free annealing and oxygen-containing annealing, the ratio of the oxygen-containing annealing duration to the oxygen-free annealing duration being greater than 1. This disclosure at least helps to avoid excessive erosion of the doped layer located on the first region.

The present invention relates to a processing method for preparing a smooth end face of a microstructure optical fiber, and the steps are as follows: 1. inserting the end of the optical fiber to be processed vertically into a concentrated sulfuric acid corrosive solution, and removing the coating layer of the optical fiber when an inert gas is introduced into the optical fiber air hole at the other end of the optical fiber, so as to obtain a bare optical fiber of a required length; 2. preliminarily rinsing the corroded optical fiber end with distilled water; 3. placing the optical fiber end in an ultrasonic cleaning machine for deep cleaning; 4. vertically inserting the bare optical fiber end to be processed into the corrosive solution, and removing the end face of the bare optical fiber when an inert gas is introduced into the optical fiber air hole at the other end of the optical fiber; 5. preliminarily rinsing the corroded bare optical fiber end with distilled water; 6. placing the bare optical fiber end in an ultrasonic cleaning machine for deep cleaning; 7. drying the optical fiber end after deep cleaning to complete the end face smoothing of the optical fiber. The present invention can obtain a smooth microstructure optical fiber end face on the one hand, and will not cause damage to the optical fiber on the other hand.

The invention discloses a lifeboat capable of being quickly thrown, which comprises a suspension frame arranged on a ship side of a main ship, and the front end of the suspension frame extends out of the ship; the ship body is arranged below the suspension frame; the suspension system is arranged on the suspension frame and can be connected to the ship body in a self-unhooking manner so as to hoist the ship body; and the sagging damping system is arranged on the suspension frame and is used for applying damping to the sagging ship body, so that the ship body stably falls into water. According to the scheme, the vertical descending damping system is arranged on the suspension, so that nonlinear ordered speed reduction can be realized when the lifeboat which rapidly falls is close to the water surface, and the impact of the lifeboat is not too large when the lifeboat falls on the water surface. Namely, by means of the scheme, the stability of the lifeboat falling on the water surface after the lifeboat is thrown is guaranteed while quick throwing of the lifeboat is achieved.

The present invention discloses a lifeboat that can be deployed quickly, including a suspension, which is arranged on the side of the main ship and the front end extends out of the ship; a hull, which is arranged below the suspension; a suspension system, which is arranged on the suspension and can be connected to the hull by self-decoupling to lift the hull; a vertical drop damping system, which is arranged on the suspension to apply damping to the vertical drop hull so that the hull falls smoothly into the water. This solution arranges a vertical drop damping system on the suspension so that the rapidly falling lifeboat can achieve nonlinear orderly deceleration when approaching the water surface, thereby ensuring that the impact of the lifeboat will not be too large when it falls on the water surface. That is, this solution not only realizes the rapid deployment of the lifeboat, but also ensures the stability of the lifeboat falling on the water surface after being deployed.

This invention belongs to the field of copper composite material preparation technology, specifically relating to a method for preparing single-walled carbon nanotube-copper composite materials. Single-walled carbon nanotubes are prepared using a flotation catalytic method, followed by acid washing and high-temperature repair purification. Subsequently, the single-walled carbon nanotubes are subjected to mixed acid gradient oxidation, and cobalt nanoparticles are chemically deposited onto their surface. Then, an amorphous titanium dioxide coating is composited onto the modified single-walled carbon nanotubes using a sol-gel method. The composite powder is added to molten copper and mixed uniformly under ultrasonic and magnetic field-assisted stirring. Finally, the mixture is rapidly solidified and hot-drawn into copper rods using a hot-casting method under continuous magnetic field assistance to obtain the single-walled carbon nanotube-copper composite material. This method improves the dispersion and interfacial bonding strength of single-walled carbon nanotubes in the copper matrix and enables the single-walled carbon nanotubes to oriented within the copper matrix. The method is simple, and the prepared composite material exhibits excellent electrical, thermal, and mechanical properties.

The invention provides an aggressive agent for titanium-palladium alloy metallographic erosion. The aggressive agent comprises the following components: glycerol, methanol, benzenesulfonic acid, oxalic acid and deionized water. By using the etchant disclosed by the invention, the corrosion of the metallographic structure of the titanium-palladium alloy can be easily controlled, the process is safer, and the metallographic structure which is easy to observe can be more easily obtained; the preparation and erosion processes of the erosion agent are simple and convenient to operate.