Abstract: A method for evaluating comprehensive performance of an acousto-optic chalcogenide glass material is provided, which is a comprehensive quantitative evaluation method achieved by an analytic hierarchy process and a radar chart method. Indexes of an evaluation index system of the method include acousto-optic figure of merit, mechanical performance, a thermo-optic coefficient, laser damage resistance, acoustic performance and other important performance. According to the method, the defect of subjective judgment of a decision maker is overcome, and the weights of various performance evaluation indexes of the acousto-optic chalcogenide glass material are more reasonable. Meanwhile, the advantages and disadvantages of the performance of the acousto-optic chalcogenide glass material are evaluated using the radar chart, which intuitively and concisely display whether the performance of the material is balanced or not.

Abstract: The present invention discloses a hollow fiber membrane material for a high-humidification hydrogen fuel cell humidifier and a preparation method and application thereof, and belongs to the technical field of fuel cell materials. The present invention provides a hollow fiber membrane material, and the preparation method includes: mixing and dissolving sulfonated polyarylene ether nitrile resin, a pore-forming agent, a modified nano-filler and a solvent for still standing; performing vacuumizing; coagulating a spinning fluid in an internal coagulant bath and an external coagulant bath; and washing and drying an obtained crude product to obtain the hollow fiber membrane material.

Abstract: The disclosure provides a fan assembly and a vacuum cleaner with the fan assembly. The fan assembly includes a motor, an impeller and a fan housing. The impeller is driven by the motor, which includes an impeller air outlet and an impeller air inlet. The impeller air inlet is located in the axial direction of the impeller, and the impeller air outlet is located in the radial direction of the impeller. An air channel is formed inside the fan housing, and the impeller is at least partially housed in the fan housing. The impeller rotates relative to the fan housing about the rotational axis, the generated airflow enters the air channel during the rotation of the impeller, and the height of the fan housing in the direction of the rotational axis increases along the direction of the air flow.

Abstract: A vacuum cleaner includes a head assembly including a housing and a fan arranged in the housing. A dust storage barrel and a filter assembly are arranged below the head assembly, the dust storage barrel being detachably connected to the head assembly. A switch is provided for controlling the fan located in the housing. A side wall of the housing has a cavity defined by an opening. A switch trigger is provided for turning on or turning off the switch and is located in the cavity so that no part of the switch trigger extends outwardly past an outer contour of the housing.

Abstract: A vacuum cleaner includes a head assembly including a housing and a fan arranged in the housing. A dust storage barrel and a filter assembly are arranged below the head assembly, the dust storage barrel being detachably connected to the head assembly. A switch is provided for controlling the fan located in the housing. A side wall of the housing has a cavity defined by an opening. A switch trigger is provided for turning on or turning off the switch and is located in the cavity so that no part of the switch trigger extends outwardly past an outer contour of the housing.

Abstract: A pair of eyeglasses includes two temple pivotal bases respectively connected to the opposite sides of a lens frame, and each temple pivotal base has its front side formed with a recessed surface. Two cover-position members are respectively and pivotally assembled on the recessed surface of the temple pivotal base. The lens frame has the opposite portions near a bridge respectively provided with an arc-shaped recessed groove for fitting a lens therein. To assemble a lens on the lens frame, simply turn open the cover-position member, fit the lens in the recessed groove through the recessed surface and then close pivotally the over-position member on the recessed surface to finish assembly of the lenses.