Abstract: A fluid machinery includes: a crankshaft, a cylinder sleeve, a crossed groove structure and sliding blocks, and there is a first included angle A between two eccentric parts of the crankshaft. The crankshaft and the cylinder sleeve are eccentrically arranged and have a fixed eccentric distance therebetween. The crossed groove structure has two limiting channels sequentially arranged along an axial direction of the crankshaft, and there is a second included angle B between the extension directions of the two limiting channels. The first included angle A is twice of the second included angle B. The two eccentric parts are correspondingly extended into two through holes of the two sliding blocks, and the two sliding blocks are correspondingly arranged in the two limiting channels in a sliding manner, to form a volume-variable cavity.

Abstract: A motor includes: an air guide member having a plurality of first air channels to form an air guide area; a stator assembly having a plurality of second air channels to form a heat dissipation area; a housing having an receiving cavity to receive the stator assembly and air guide member; an air outlet member connected to the housing having an outlet area; a rotor rotatably arranged within the stator assembly; a preload support assembly having a first preload unit and a second preload unit respectively located on both sides of the stator assembly, the first preload unit and the second preload unit are both connected to the shaft to form opposing forces; and an impeller arranged on one side of the air guide member; the air guide area, the heat dissipation area and the outlet area together form an only air channel of the motor.

Abstract: The present invention is applicable to the field of audio collection and provides a fixed apparatus and an audio collection device. Multiple groups of simulated ear structures are disposed on the fixed apparatus, and the simulated ear structures have simulated ear canal openings used for placing audio collectors. The audio collectors may placed in simulated ear canal openings of the simulated ear structures of the fixed apparatus, so that collected audio signals have richer sources, higher quality, and higher stereoscopic sensation. The fixed apparatus may be used for audio recording in multiple orientations, so that smoothness, clearness, and comfort during sound field fusion and switching are ensured, more complete and richer sound field information is collected, the best sound field naturalness can be obtained, and a requirement for synchronization between a sound and an image in a VR panoramic video technology is met.

Abstract: The present invention is applicable to the field of audio recording and provides a recording device and a fixed apparatus.

Abstract: The present invention is applicable to the field of audio recording and provides an audio collection apparatus. Multiple fixed apparatuses are stacked and have ear structures and face contours, and audio collectors are disposed at ear canal openings of the ear structures to collect audio information. During audio collection, faces of the fixed apparatuses have different horizontal orientations, so that the audio collectors obtain the audio information at the ear canal openings of the ear structures towards horizontal directions. Therefore, rich sound sources and sound authenticity are ensured, sounds are rich in quality, a stereo field perception effect is achieved, a real sound field relationship can be restored, an in-head effect is avoided, and a requirement for real synchronization between a sound and an image in a virtual reality (VR) panoramic video technology is met.

Abstract: The present invention is applicable to the field of audio collection and provides a fixed apparatus and an audio collection device. Multiple groups of simulated ear structures are disposed on the fixed apparatus, and the simulated ear structures have simulated ear canal openings used for placing audio collectors. The audio collectors may placed in simulated ear canal openings of the simulated ear structures of the fixed apparatus, so that collected audio signals have richer sources, higher quality, and higher stereoscopic sensation. The fixed apparatus may be used for audio recording in multiple orientations, so that smoothness, clearness, and comfort during sound field fusion and switching are ensured, more complete and richer sound field information is collected, the best sound field naturalness can be obtained, and a requirement for synchronization between a sound and an image in a VR panoramic video technology is met.

Abstract: The present invention is applicable to the field of audio recording and provides a recording device and a fixed apparatus.

Abstract: The present invention is applicable to the field of audio recording and provides an audio collection apparatus. Multiple fixed apparatuses are stacked and have ear structures and face contours, and audio collectors are disposed at ear canal openings of the ear structures to collect audio information. During audio collection, faces of the fixed apparatuses have different horizontal orientations, so that the audio collectors obtain the audio information at the ear canal openings of the ear structures towards horizontal directions. Therefore, rich sound sources and sound authenticity are ensured, sounds are rich in quality, a stereo field perception effect is achieved, a real sound field relationship can be restored, an in-head effect is avoided, and a requirement for real synchronization between a sound and an image in a virtual reality (VR) panoramic video technology is met.

Abstract: A positive electrode comprising ?-VOPO4 and/or Nax(?-VOPO4) wherein x is a value from 0.1 to 1.0 as an active ingredient, wherein the electrode is capable of insertion and release of sodium ions and a reversible sodium battery containing the positive electrode are provided.

Abstract: A positive electrode comprising ?-VOPO4 and/or Nax(?-VOPO4) wherein x is a value from 0.1 to 1.0 as an active ingredient, wherein the electrode is capable of insertion and release of sodium ions and a reversible sodium battery containing the positive electrode are provided.