Abstract: A method for preparing a durably hydrophilic and uniform-pore ultrafiltration membrane is disclosed herein. Chemical reactions between the functional groups and the active bonds of the molecular chains in the membrane materials are initiated perform the grafting of hydrophilic chains on the polymer chains under conventional dissolution conditions of the polymer membrane material (dissolution with synchronized hydrophilization), so as to realize durable hydrophilization of the membrane materials. The resulting hydrophilized polymer solution (a nascent-state membrane) is introduced into a coagulation bath to initiate a crosslinking reaction among the hydrophilic chains. The resulting crosslinking serves to synergistically regulate subsequent phase separation and membrane formation (phase separation under synergistic crosslinking).

Abstract: Aspects of the present disclosure provide an audio output mode adjustment structure that can include a sound output channel communicating an interior and an exterior of the electronic device and an adjusting unit. An opening of the sound output channel is located at the top of the electronic device. The adjustment unit moves relative to the opening of the sound output channel so that when the electronic device outputs audio in a loud-speaking mode, the adjustment unit does not cover the sound output channel, and sound waves propagate in a straight line through the opening of the sound output channel, and when the electronic device outputs audio in the handset mode, the adjustment unit covers the opening of the sound output channel, so that the sound waves propagate toward a display screen side of the electronic device through the opening of the sound output channel.

Abstract: Aspects of the present disclosure provide an audio output mode adjustment structure that can include a sound output channel communicating an interior and an exterior of the electronic device and an adjusting unit. An opening of the sound output channel is located at the top of the electronic device. The adjustment unit moves relative to the opening of the sound output channel so that when the electronic device outputs audio in a loud-speaking mode, the adjustment unit does not cover the sound output channel, and sound waves propagate in a straight line through the opening of the sound output channel, and when the electronic device outputs audio in the handset mode, the adjustment unit covers the opening of the sound output channel, so that the sound waves propagate toward a display screen side of the electronic device through the opening of the sound output channel.