Abstract: An electrostatic electroacoustic device comprising a first electrode configured to receive an audio signal, a second electrode configured to receive the audio signal, a first electret between the first electrode and the second electrode, the first electret including at least one dielectric layer containing electrostatic charges, a second electret between the first electrode and the second electrode, the second electret including at least one dielectric layer containing electrostatic charges, and a conductive layer sandwiched between the first electret and the second electret, the conductive layer, the first electret and the second electret being capable of vibratory motion relative to the first electrode and the second electrode based on the audio signal.

Abstract: An electrostatic electroacoustic device comprising a first electrode configured to receive an audio signal, a second electrode configured to receive the audio signal, a first electret between the first electrode and the second electrode, the first electret including at least one dielectric layer containing electrostatic charges, a second electret between the first electrode and the second electrode, the second electret including at least one dielectric layer containing electrostatic charges, and a conductive layer sandwiched between the first electret and the second electret, the conductive layer, the first electret and the second electret being capable of vibratory motion relative to the first electrode and the second electrode based on the audio signal.

Abstract: An ionic electroactive graft copolymer with a fluorine-containing backbone and a carbazole-containing side chain having the following repeating unit is disclosed: 1

Abstract: An improved gas injection nozzle for use in gas-assisted injection molding process is disclosed. The improved gas injection nozzle comprises: (a) a nozzle body, and a nozzle cap fixedly connected to the nozzle body; (b) a gas inlet provided in the nozzle body so as to allow gas to be injected into a mold cavity via a gas channel formed inside both the nozzle body and the nozzle cap; (c) a heating coil provided on the gas injection nozzle; and (d) at least one circumferential groove formed on the outer surface of the nozzle cap. The circumferential groove formed on the outer surface of the nozzle cap preferably has the shape of a spiral groove, with a depth between about 0.2 mm and about 0.5 mm and a length between about 50 mm and about 150 mm. The combination of the heating coil and the circumferential groove prevents the formation of micro cracks that are often formed in the interstices between the nozzle cap and the sprue bushing during the cooling stage of injection molding process.