Abstract: Provided is a preparation method of a detector material. The present disclosure epitaxially grows a buffer layer on a surface of a gallium arsenide substrate, deposits a silicon dioxide layer on the buffer layer, and etches the silicon dioxide layer on the buffer layer according to a strip pattern by photolithography and etching to form strip growth regions with continuous changes in width. Finally, a molecular beam epitaxy (MBE) technology is used to epitaxially grow the detector material in the strip growth regions under set epitaxy growth conditions. Because of the same mobility of atoms arriving at the surface of the substrate, numbers of atoms migrating to the strip growth regions are different due to different widths of the strip growth regions, such that compositions of the material change with the widths of the strip growth regions or a layer thickness changes with the widths of the strip growth regions.

Abstract: The preset invention provides an energy-saving process and device for recovering C2 from refinery dry gas. The process is as follows: dry gas is cooled and then sent to a multi-stage absorption tower for treatment; the gas phase from the multi-stage absorption tower is sent to a fuel gas pipeline network or PSA unit, and the liquid phase is sent to a high-pressure flash zone for treatment; the gas phase from the high-pressure flash zone is returned to a compression section of a dry gas pretreatment system; the gas phase from the low-pressure flash zone is sent to a C2 concentrated gas compressor system; and the gas phase from the desorption tower is mixed with the gas phase obtained from the low-pressure flash zone and sent to an ethylene cracking furnace as a C2 concentrated gas product, most of the liquid phase is returned to the multi-stage absorption tower.

Abstract: The present invention discloses an air volume adjustment device for a refrigerator. The air volume adjustment device comprises: a fan capable of introducing cold air from an evaporator into the first air inlet cavity and the second air inlet cavity; a baffle arranged between a first air inlet cavity of a first compartment and a second air inlet cavity of a second compartment, which is capable of moving among a plurality of positions to adjust the volume of air entering the first air inlet cavity and the second air inlet cavity; and an operating knob and a potentiometer which are connected to the front side and the rear side of the baffle, respectively. The operating knob is capable of operably driving the baffle to move. The potentiometer transfers an electrical signal corresponding to a position of the baffle to the controller for controlling the fan or the compressor.

Abstract: The present invention discloses an air volume adjustment device for a refrigerator. The air volume adjustment device comprises: a fan capable of introducing cold air from an evaporator into the first air inlet cavity and the second air inlet cavity; a baffle arranged between a first air inlet cavity of a first compartment and a second air inlet cavity of a second compartment, which is capable of moving among a plurality of positions to adjust the volume of air entering the first air inlet cavity and the second air inlet cavity; and an operating knob and a potentiometer which are connected to the front side and the rear side of the baffle, respectively. The operating knob is capable of operably driving the baffle to move. The potentiometer transfers an electrical signal corresponding to a position of the baffle to the controller for controlling the fan or the compressor.