3results about How to "Reduce Mismatch Problems" patented technology

The application discloses a planar array FDA-MIMO radar main lobe interference suppression method, and the Capon technology is used to estimate target signal power to dynamically adjust a DL loading factor; based on eigenvalue distribution of a sample covariance matrix, an adaptive subspace dimension selection strategy is introduced to balance robustness and main lobe suppression performance under different mismatch conditions; the beamformer can adjust the projection subspace and the diagonal loading coefficient according to actual conditions, and can solve the mismatch problem of the steering vector caused by the distance-angle error, the array element position error, the frequency offset and the coherent local scattering, effectively suppress the main lobe interference while improving the beam robustness, obtain better SINR performance, and has wide application value and promotion prospect.

The invention discloses a method for epitaxial growth of a perovskite single crystal heterojunction. According to the method, a saturated acid solution of a specific solute is selected, heteroepitaxy is carried out on different types of perovskite layers, a perovskite lattice structure of a mother layer on the surface of a substrate is flexibly changed, the problem of lattice mismatch caused by lattice mutation at a heterojunction due to heteroepitaxy is solved, the defect density of a material at the heterojunction is reduced, and the performance of the device is improved. The heteroepitaxy yield is improved, and the epitaxial growth crystal quality of the perovskite material is improved. The method comprises the following specific steps: putting a perovskite substrate into a specific saturated acid solution, cooling to separate out crystals, and carrying out heteroepitaxial growth. According to the method, the heteroepitaxy yield of the perovskite material is remarkably improved, the heterojunction defect density is reduced, and the method has wide application potential.

The application belongs to the technical field of electrocatalytic hydrogen production, and particularly relates to an off-grid alkaline hydrogen production electrocatalyst coupled with a crystal lattice hydrogen and a gradient layered structure, a preparation method and application thereof. The application provides a low-cost and high-performance alkaline hydrogen production electrocatalyst and a preparation method thereof. The electrocatalyst adopts tungsten carbide (WC) as a carrier, and is compounded with oxygenophilic metal (Ni or Ru) and MnO2 to form a composite electrocatalyst with a gradient layered structure. The technical advantage lies in that the MnO2 / WC interface is used to optimize the de-intercalation process of the crystal lattice hydrogen, and the bottleneck of hydrogen desorption is solved; the Ru(Ni) / WC gradient layered interface is used to promote water molecule dissociation and enhance the anti-start-stop stability. Benefiting from the above-mentioned synergistic effect, the prepared Ru(Ni)-MnO2 / WC electrocatalyst exhibits excellent catalytic activity and outstanding long-term stability in alkaline HER.