3results about How to "Uniform potential" patented technology

The invention provides an aluminum alloy pretreatment method based on complex reaction, which comprises the following steps: S1, polishing an LDH (Layered Double Hydroxides) growth surface by using abrasive paper, and cleaning and drying; s2, preparing a complexing agent solution, wherein a complexing agent is selected from at least one of tannic acid, gallic acid and protocatechuic acid; s3, the aluminum alloy sample treated in the step S1 is put into the complexing agent solution in the step S2, and constant potential is applied to the aluminum alloy; s4, preparing a mixed solution of Zn (NO3) 2.6 H2O and NH4NO3, and adding an ammonia water solution to adjust the pH value to 6-6.5; s5, immersing the aluminum alloy treated in the step S3 into the mixed solution in the step S4, and putting the aluminum alloy into a constant-temperature water bath kettle to generate a Zn-Al-LDH film; and S6, after the hydrothermal reaction is finished, cooling to room temperature, and washing and drying the obtained reaction product. The surface of the aluminum alloy is pretreated through the complexing agent, the potential between an intermetallic compound and an aluminum matrix can be effectively balanced, the micro-couple effect is fundamentally inhibited, and ideal conditions are created for uniform, compact and defect-free growth of LDH.

This application discloses a surface acoustic wave filter, comprising: a piezoelectric substrate, a plurality of resonators spaced apart on the piezoelectric substrate, and a resistive thin film layer. The resistive thin film layer is disposed on and covers the plurality of resonators, and a first gap region exists between the resistive thin film layers of two adjacent resonators.

A therapeutic device for cell stimulation or cell therapy comprises a housing accommodating electrodes, a generator for generating high-frequency pulses, a processor unit comprising a control, regulation and calculation module, a memory unit, a control element, a controllable modulator by means of which the generator can be controlled. A voltage pulse sequence comprising a plurality of voltage pulses can be generated by means of the modulator, wherein the frequency of the voltage pulse sequence can be at least partially non-constant.