4results about How to "Good consistency" patented technology

This invention discloses a samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material, its preparation method, and its applications. The samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material belongs to the monoclinic crystal system, has a space group of Cm, and a chemical formula of Sm. 0.3 La 0.1 :Y 0.6 Ca4O(BO3)3 has a second harmonic response intensity of 0.89 × KDP, and exhibits transmittance exceeding 80% in the 500–1000 nm and 1600–2400 nm wavelength ranges. It also has a strong absorption peak in the 1000–1600 nm wavelength range. Therefore, the samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal can be considered as a nonlinear optical crystal material with broad application prospects in the field of optics.

The invention discloses a lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material and a preparation method thereof, the lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material belongs to a monoclinic system, the space group is Cm, the chemical formula is La0.1: Y0. 9Ca4O (BO3) 3, the frequency multiplication coefficient is 2 * KDP, the ultraviolet cut-off edge is less than 200 nm, and no absorption peak with the intensity greater than or equal to 0.2 cm <-1 > exists in the range of 200-2500 nm. Therefore, the lanthanum ion doped yttrium calcium oxide borate crystal can be used as a nonlinear optical material with a wide application prospect in the field of optical parameter chirped pulse amplification.

The invention provides an acoustic resonator based on a periodically polarized piezoelectric film and a preparation method thereof, and the method comprises the steps: carrying out the local polarization of a piezoelectric film layer, forming the polarized regions and the non-polarized regions which are alternately arranged in a material crystal for forming the piezoelectric film layer, and enabling an interdigital electrode to be disposed at the center of the polarized regions and the non-polarized regions, according to the invention, an equivalent stiffness constant in a sound wave propagation path is regulated and controlled, so that the resonant frequency is remarkably improved, and the physical size (physical thickness or electrode size) of the device does not need to be changed, so that excellent electromechanical coupling coefficient and passband bandwidth can be kept; as the frequency is improved without reducing the finger width of the interdigital electrode and carrying out limit thinning on the piezoelectric film, the dependence on high-end photoetching equipment and the process complexity are reduced, and the problems of difficulty in thickness uniformity control, reduction of mechanical strength, poor process consistency and low yield caused by preparation of an ultrathin film are solved; and the production cost is reduced.

The application discloses a land survey quality monitoring system for remote sensing image intelligent segmentation and ground object identification, relates to the technical field of remote sensing, and comprises an image identification module, a label comparison module and a monitoring module. Specifically, remote sensing images of land to be monitored are acquired through a remote sensing sensor, image regions are divided through structural complexity analysis, and the category probability vectors of the pixel positions of each region in the formed non-uniform region set are analyzed and acquired to construct a label map of the whole remote sensing image. Pixel-by-pixel category comparison is performed on the current label map and a reference label map to form a change mask map. Structural change regions are identified according to the change mask map. Through time sequence analysis, it is determined whether the corresponding candidate label inconsistent regions under different time phases are still structural change regions to acquire a judgment result. Based on the judgment result, an electronic map is updated.