Shandong University

Goertek Inc.

Qing Wang

Rui Zhang

Xu Zheng

Ning Wang

Lijun Ma

Chuantao Zhang

Jintao Zhang

Xingyuan Zhang

Wenquan Du

The present disclosure discloses a method and apparatus for directional sound emission of an audio device, and an audio device. The method includes: by using the spherical microphone array, determining a spatial position of a sound-emission sound source of a user; according to a relationship among the spatial position of the sound-emission sound source of the user, a center position of the audio device and an opening position of the loudspeaker, determining a horizontal compensatory angle and a vertical compensatory angle of the opening direction of the loudspeaker relative to the spatial position of the user; and adjusting the opening direction of the loudspeaker, so that the horizontal compensatory angle and the vertical compensatory angle are made to be zero.

Directional sound generation method and device for audio apparatus, and audio apparatus

Disclosed is a method of preparing a flexible deformable photonic crystal material for structural health monitoring, comprising the following steps: washing a grating master template; preparing and assembling a mold; obtaining an assembled mold by printing a three-dimensional mold comprising an upper die and a lower die by use of a 3D printing device and installing the grating master template on the three-dimensional mold; obtaining a polydimethylsiloxane (PDMS) one-dimensional photonic crystal film by replicating a one-dimensional grating structure of a surface of the grating master template by pouring PDMS into the assembled mold; finally, obtaining the PDMS one-dimensional photonic crystal film with a one-dimensional photonic crystal structure on a middle surface and protrusion structures at both ends by demolding, wherein the PDMS one-dimensional photonic crystal film is the flexible deformable photonic crystal material. A mechanochromic photonic crystal film is prepared by using a master template with a photonic crystal structure, a process is simple and easy to operate, a preparation period of a mechanochromic material is greatly shortened, and a preparation cost is reduced.

Method of preparing flexible deformable photonic crystal material for structural health monitoring

A mold with cavities for nanoimprint lithography and a method of imprinting the same. The mold is a one-piece structure, including an upper mold and a lower mold which are welded together. The upper mold is evenly provided with a plurality of stepped holes. A plurality of grooves are provided at an upper surface of the lower mold. Both ends of each groove are respectively connected to an external high-pressure water pump and an external vacuum pump via pipelines. An airtight cavity is additionally provided at the interior of the mold to form a negative pressure in the cavity by vacuumizing during the imprint process. In the demolding, a crack is formed at the interface between the mold and the imprint resist by using water pressure and expands to the entire interface for the demolding of the imprinted structure.

Mold with cavities for nanoimprint lithography and method of imprinting same

Growing community of inventors

Shandong, China

Qing Wang