76results about How to "Low acoustic impedance" patented technology

The invention provides a display screen, an electronic device and a production method of the display screen. The display screen comprises an upper glass substrate, a lower glass substrate, supporting parts, a thin film transistor and filling layers; the supporting parts are arranged between the upper glass substrate and the lower glass substrate, and the supporting parts are used for supporting and fixing the upper glass substrate and the lower glass substrate; the thin film transistor is arranged on one surface, towards the upper glass substrate, of the lower glass substrate; the filling layers are formed between the upper glass substrate and the lower glass substrate and allow light rays or ultrasonic waves to penetrate, and the filling layers are in a flowing state or solid state. The display screen can be applied to a scheme that an ultrasonic wave fingerprint is used on the screen, so that the screen rate of the electronic device is larger, and the user requirements are met.

An ultrasound transducer array with at least one composite material layer. The layer having a polymer base in which polymer particles are embedded. The polymer particles are coated with a material that has a thermal conductivity that is higher than the thermal conductivity of the polymer base and the polymer particles.

The invention provides a wireless intelligent Kegel pelvic muscle training device and a control method of the wireless intelligent Kegel pelvic muscle training device. Pelvic muscle pressure is collected through a thin-film pressure sensor, and biological feedback is performed according to the magnitude of the pressure, so that the vibration intensity of pelvic muscle training is adjusted; non-traumatic treatment is performed on postpartum women and uracratia patients through human-computer interaction so that the rehabilitation effect can be achieved. The wireless intelligent Kegel pelvic muscle training device has the ingenious advantages that a targeted training course can be performed according to the age group and the disease degree of the patients; treatment data of the training device can be compared with historical treatment data at different treatment stages in real time; accordingly, the treatment scheme can be adjusted and optimized, and therefore insufficient treatment or overtreatment is avoided.

The invention discloses a composite film-based frequency-adjustable surface acoustic wave gyro, which comprises a magnetostrictive substrate, a piezoelectric film, a surface acoustic wave resonator, a surface acoustic wave detector, a metal dot matrix, a phase-shift network and a radio-frequency amplifier. The piezoelectric film is covered on the magnetostrictive substrate; the surface acoustic wave resonator, the surface acoustic wave detector and the metal dot matrix are arranged on the surface of the piezoelectric film; the surface acoustic wave resonator, the phase-shift network and the radio-frequency amplifier form a surface acoustic wave oscillator together; the surface acoustic wave resonator and the surface acoustic wave detector are arranged in a mutually perpendicular crossing way; the surface of the piezoelectric film at the intersection of the surface acoustic wave resonator and the surface acoustic wave detector forms a blank; and the metal dot matrix is positioned at the blank. The gyro has the advantages of simple and compact structure, low cost, easy and simple operation and the like, can adjust the working frequency of the surface acoustic wave gyro in a certain range, can realize matching of the working frequency of the oscillator and the working frequency of the detector, and effectively improves the sensitivity and accuracy of the surface acoustic wave gyro.

The invention relates to a nanometer cellulose / polyvinyl alcohol gel composite material, which is characterized by comprising hydrogel and aerogel. A preparation method of the nanometer cellulose / polyvinyl alcohol gel composite material comprises the following process steps of 1, nanometer cellulose preparation by a chemical combination mechanical treatment method; 2, composite hydrogel preparation; and 3, composite aerogel preparation. The nanometer cellulose / polyvinyl alcohol gel composite material has the advantages that the composite aerogel belongs to a porous amorphous solid material consisting of nanometer level colloid particles or high-polymer molecules, and a unique open nanometer level porous structure and a continuous three-dimensional reticular structure are adopted, so the density is extremely low, the specific surface area is high, and the porosity is high, wherein the solid phase of the aerogel accounts for 0.2 percent to 20 percent of the total volume percentage, the characteristics of high adsorption catalytic capability, low thermal conductivity, low sound resistance, low refractive index and the like are shown, and wide application prospects are realized in the fields of aviation, spaceflight, chemical industry, metallurgy, energy-saving building and the like.