10 results about "Piezoelectric coupling" patented technology

The utility model relates to the field of photocatalytic reaction technology, concretely relates to a kind of multi-channel photocatalysis-ultrasonic piezoelectric coupling reaction device, and the side end of reaction water tank is equipped with movable horizontal moving mechanism, and ultrasonic assembly is equipped on movable horizontal moving mechanism, movable horizontal moving mechanism drives ultrasonic assembly to move horizontally in the length direction of the side end of reaction water tank and different positions, for producing ultrasonic vibration in reaction water tank, to adjust the position of ultrasonic assembly for different number, position of photocatalytic reaction tube, flexible adaptability, introduce ultrasonic piezoelectric function, the dispersion uniformity of catalyst can be effectively enhanced using ultrasonic vibration, improve the contact probability of reactant and catalyst, accelerate reaction process. At the same time, the agglomeration phenomenon of catalyst is reduced, the service life of catalyst is prolonged, and the stability and repeatability of photocatalytic reaction are improved.

This invention provides an Ag-doped photocatalytic composite membrane, its preparation method, and its application, relating to the field of water treatment membrane technology. The Ag-doped photocatalytic composite membrane of this invention has a composite functional structure consisting of a polyester nonwoven fabric support layer, a PVDF base membrane core layer, an Ag-BaTiO3 / ZnIn2S4 piezoelectric-photocatalytic functional layer, and a polydopamine hydrophilic protective layer, arranged sequentially. By constructing an Ag-doped dual piezoelectric coupled heterojunction system, introducing the surface plasmon resonance effect of Ag ions, and combining plasma-assisted deposition technology with the composite functional structure, this invention achieves a wide spectral response (UV to near-infrared), highly efficient piezoelectric-photocatalytic synergistic degradation, robust catalyst adhesion to prevent detachment, and multiple effects of "separation-degradation-self-cleaning." This solves the problems of traditional piezoelectric-photocatalytic membranes in terms of catalytic efficiency, long-term stability, and industrial adaptability, and has good application prospects.

The present invention supports the implementation of structures for bulk acoustic wave resonators that can increase piezoelectric coupling and suppress parasitic modes. The grooves between the electrodes of the disclosed digital to analog converter (IDT) reduce the generation of parasitic modes and prevent the propagation of the parasitic modes and the resonance accumulation of the amplitude of the parasitic modes. In addition, the grooves between the disclosed IDT electrodes suppress a high order mode in a horizontal direction and increase the resonant-anti-resonant frequency gap of the bulk acoustic wave resonator.

An acoustic resonator is provided, which ensures high piezoelectric coupling and exhibits reduced (e.g., compared to conventional XBARs) acoustic losses at (and around) a resonance frequency. The acoustic resonator comprises an interdigital transducer (IDT), the interleaved fingers of which are provided on or at least partly recessed into a piezoelectric layer. The IDT has a pitch of at least twice the total thickness of the piezoelectric layer. The piezoelectric layer is attached to a support structure and covers an open cavity formed in the latter such that the overlapping portions of the fingers are suspended over the cavity. The acoustic resonator is characterized in that the piezoelectric layer is made of a piezoelectric material having a crystallographic cut at which a lateral electric field produced between adjacent IDT fingers in response to applied RF potentials of periodically opposite polarity causes excitation of the SH1 mode in the piezoelectric layer.

The present disclosure relates generally to high voltage systems. In one embodiment, a balancing and measuring circuit is disclosed, comprising: a first capacitor electrically coupled between a first voltage and a chassis voltage, wherein the first voltage is greater than the chassis voltage; a second capacitor electrically coupled between a second voltage and the chassis voltage, wherein the second voltage is less than the chassis voltage; a first circuit associated with the first capacitor; and a second circuit associated with the second capacitor, wherein the first circuit and the second circuit each comprise: a resistive element; a switching element; a voltage circuit configured to generate a reference voltage; and a controller configured to monitor a voltage of a reference capacitor and to control the switching element based on the monitored voltage, wherein the resistive element and the switching element are connected in series.

The invention relates to a high-power-density broadband vibration energy taking method, which belongs to the technical field of vibration energy taking, and comprises the following steps: S1, building an electret-piezoelectric coupling low-frequency vibration energy taking array; s2, modulating a coupling beam which vibrates cooperatively in the array, and widening a vibration energy taking working frequency domain; and S3, electrets which permanently hold polarization charges are adopted as an electrostatic field source, and based on the near-field hypothesis, the output power of the electrostatic assembly is optimized through the electrets which are arranged at intervals in polarity. The low-frequency environment vibration energy can be more efficiently collected, and the working frequency range and the power density are more considerable compared with those of other beam type low-frequency vibration energy taking methods.

The invention discloses a magnetic control piezoelectric / topological double-layer heterogeneous biological functionalized nerve scaffold as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively carrying out surface modification on magnetic nanoparticles and piezoelectric nanoparticles; dispersing the modified magnetic nanoparticles and piezoelectric nanoparticles in an inner-layer biological material solution to obtain an inner-layer spinning solution; dispersing a therapeutic drug into the outer-layer biological material solution to obtain an outer-layer spinning solution; the preparation method comprises the following steps: firstly, processing an inner-layer spinning solution to form an inner-layer fiber layer with an anisotropic topological structure; then switching to outer-layer spinning solution, and forming an outer-layer fiber layer with a disordered structure on the inner-layer fiber layer through an in-situ deposition method, so as to obtain a double-layer stent; and washing and drying the double-layer stent. According to the double-layer stent, a magnetic control piezoelectric coupling mechanism is adopted, an in-situ electrical stimulation and heterogeneous double-layer structure is generated through driving of an external magnetic field, and space-time cooperation of physical guidance and biochemical signals is achieved.

This invention discloses a triboelectric piezoelectric coupling vibration energy harvesting device, relating to the fields of smart wearable devices, biomedicine, environmental monitoring, and the Internet of Things. It includes an external excitation system, a shell, a base plate, an electromagnetic component, a piezoelectric component, and a friction component. The shell encloses the magnet and magnetic core of the electromagnetic component. The bottom of the shell is connected to the spring sheet of the piezoelectric component. The left and right sides of the piezoelectric sheet are connected to the conductors of the friction component. This invention utilizes the aforementioned triboelectric piezoelectric coupling vibration energy harvesting device, making full use of the device's space and transferring the damping generated by vibration to the friction between different materials. The reciprocating motion of the spring sheet is transferred to the deformation of the piezoelectric sheet. Through the mutual friction between the thin film and the copper foil, and the piezoelectric effect of the piezoelectric sheet, mechanical energy is converted into electrical energy to harvest more energy. Furthermore, the damping reduces the kinetic energy of the magnetic core, allowing more energy to be transferred to electromagnetic power generation.

This invention provides a self-driven channel flow velocity meter based on water flow energy-piezoelectric coupling power generation, belonging to the field of water flow energy conversion technology. It solves the problems of high charging costs and low power generation efficiency of flow velocity meters used in mountainous rivers. The meter includes a flow-guiding outer shell and a flow-guiding inner shell. The flow-guiding outer shell is streamlined, and a sealed hollow cavity is formed between the outer and inner shells. A battery, generator, control circuit board, and wireless smart gateway are fixed inside the hollow cavity. An impeller and flow-guiding blades are installed inside the inner shell. The impeller shaft is connected to the generator via a gearbox. Movable flow-guiding blades are connected to a movable flow-guiding blade support via a connecting shaft. One end of the connecting shaft connected to the movable flow-guiding blade support is fixed to a coil spring. A movable wing connects the movable flow-guiding blades to the fixed flow-guiding blades. The end of the movable flow-guiding blade is connected to the movable wing via a leaf spring, and a flexible piezoelectric sheet is attached to the movable wing. This invention is applied to the flow velocity detection of open rivers.

This invention relates to the field of composite energy power generation technology, specifically to a photovoltaic-thermal-piezoelectric coupling power generation device, comprising a transparent thermally conductive glass plate, a flexible photovoltaic panel, a semiconductor thermoelectric generator, a piezoelectric ceramic film, and heat dissipation fins. The upper surface of the flexible photovoltaic panel is covered with the transparent thermally conductive glass plate. The semiconductor thermoelectric generator has a non-connected end and a connected end of a PN-type semiconductor. The non-connected end is fixedly connected to the upper surface of the transparent thermally conductive glass plate, and the connected end is fixedly connected to the bottom of the piezoelectric ceramic film. The piezoelectric ceramic film is disposed on the lower surface of the flexible photovoltaic panel, and the heat dissipation fins are disposed below the connected end of the semiconductor thermoelectric generator. This invention uses a semiconductor thermoelectric generator to generate electricity based on the temperature difference between the top and bottom of the photovoltaic panel, while integrating a piezoelectric ceramic film to generate electricity using the mechanical energy of raindrops. This provides heat dissipation for the photovoltaic panel and improves energy utilization efficiency. It has a simple structure and can operate in all weather conditions.