32 results about "Equidistant grid" patented technology

The invention discloses an easy-to-clean mosquito killing device. The structure includes: a body, a mosquito collecting mechanism, a frame plate, and a power grid. The bottom end of the body is fitted with a mosquito collecting mechanism. Its sides are arranged in a circular equidistant grid, and the beneficial effect of the present invention is to use the storage chassis to place substances rich in stearic acid that attract mosquitoes to realize the concentration of mosquitoes in the mosquito collecting mechanism and control the locking and release of the pressing plate by triggering the connecting rod Time to prevent mosquitoes from flying out of the structure again, combined with the power grid to kill mosquitoes, can effectively avoid secondary pollution.

A numerical calculation method for finite volume flow field based on non-equidistant grids, which involves a fifth-order finite volume WENO scheme with linear weights. Without reducing the overall numerical accuracy, only three additive A positive number equal to 1 is used as a linear weight, and then subsequent calculations can be performed. Since the numerical format constructed by the present invention does not need to calculate complex linear weights related to the grid scale under non-equidistant grids, it is easier to extend to higher-order WENO schemes, moving grids, or flow fields in adaptive grids calculate. In addition, the present invention, like the traditional WENO format, uses the Runge-Kutta time-discrete method with good stability, simple operation and easy programming to solve the problem. Finally, the present invention verifies its superiority in flow field calculation by comparing it with the traditional formula through specific numerical examples.

The invention relates to a rice tiller image acquisition device and a rice leaf vein curve and leaf angle extraction method. A main body of the rice tiller image acquisition device comprises a camera, a support frame, a background board, a computer, a camera fixing device, a regulating plate, a stalk fixing device and check paper, wherein the camera is fixed on the support frame through the camera fixing device, and the height of the camera is regulated through selecting a fixed position; the background board is a black wooden board; the stalk fixing device is a wooden block with an iron hairpin, and a stalk is inserted on the iron hairpin when an image is shot; the regulating plate can regulate a distance between the camera and the background board; the camera is a high-definition network camera and is directly connected with the computer, and a rice tillering image is shot by software provided by the camera; the check paper is a piece of white paper on which a black equidistant grid point is drawn. By the utilization of the device and the method provided by the invention, the rice tiller image acquisition and the rice leaf vein curve and leaf angle extraction are convenient, quick and accurate, hardware and a method are provided for the extraction of rice leaf shapes and parameters, and basic parameters can be provided for the stimulation and the optimal design of rice plant shapes.

The invention relates to a rice leaf shape collection device and a method for extracting rice leaf shape parameters. A rice leaf shape collection device, its main body includes a camera, a camera fixing device, a bracket bar, a leaf loading platform, a bracket vertical bar, a bracket regulator, a computer, a check paper, double-sided adhesive tape, and a black tape; the camera is fixed through the camera The device is fixed on the horizontal bar of the bracket; the leaf loading table is a black horizontal tabletop, and the black tape is pasted on the leaf loading table with double-sided adhesive tape, and the side with the glue is facing upward; the vertical bar of the bracket is fixed on the side of the leaf loading board. In the center, the distance between the camera and the table can be adjusted through the bracket adjuster; the camera is directly connected to the computer; the verification paper is a piece of white paper with black equidistant grid points. Using the device and method of the present invention to collect rice leaf shape images and extract rice leaf shape curves and leaf areas is convenient, fast and accurate, and provides hardware and methods for the extraction of rice leaf shape and parameters, and can be used for the simulation and optimization of rice plant shape The design provides the basic parameters.

The invention relates to an irregular model aperture-based common offset Kirchhoff prestack depth migration imaging method. With too small width, the conventional rectangular aperture can suppress shallow offset noise but lowers depth imaging quality; with too large width, the conventional rectangular aperture can guarantee depth imaging quality but causes stronger offset noise and lowers shallowimaging quality. Considering both offset size and maximum depth of an imaging model space, the method designs an irregular model space offset aperture with narrow shallow and wide deep, splits the irregular aperture by using grids of unequal distances and calculates a travel timetable in the irregular model aperture alone, then performs common offset Kirchhoff prestack depth migration imaging. Themethod can suppress shallow offset noise effectively and guarantees depth imaging quality; a travel timetable outside an irregular aperture is not calculated, so that calculation efficiency is improved; the range of the depth offset aperture is maximized without increasing excessive calculation amount, so that advantages like higher depth even super-depth imaging quality are increased.