51results about How to "Sparsely distributed" patented technology

The invention discloses a method for carrying out low-complexity angle estimation by using a co-prime linear array. The method comprises the steps of: firstly, carrying out vectorization processing ona covariance matrix of an array received signal, deleting redundant rows and intercepting a continuous array element part to obtain a received signal of a virtual uniform linear array with an array element interval of half of lambda; then carrying out DFT (Discrete Fourier Transform) on the virtual received signal and finding out positions of K maximum peak values (K represents an information source number), so that initial estimation of a DOA (Direction Of Arrival) can be obtained; and finally, carrying out DFT on the virtual received signal subjected to phase rotation, searching a rotationphase eta in a small range, respectively finding out a rotation phase which enables the K peak values to be shrunk to the maximum, and obtaining accurate estimation of the DOA hereby. According to theinvention, DFT and a DOA estimation problem of the co-prime linear array are combined, the virtual received signal does not need to be subjected to decorrelation processing, a relatively high space freedom degree can be obtained, and meanwhile, the method has low calculation complexity and high estimation accuracy.

A method and system for assigning working addresses to slave units in a vehicle fire system. Slave units responding to a default address are identified along with available working addresses. Individual slave units are isolated at the default address by instructing the slaves to compare their serial numbers to a broadcast serial number until only a single slave responds, wherein bits in the serial numbers are reversed to create a more sparse distribution of the serial numbers of the slave units, and assigning the slave units, which responded to the default address, to the available working addresses.

A method includes, following specification of an initial transformation as a test transformation that is to be optimized, determining a 2D gradient x-ray image and a 3D gradient dataset of the image dataset, carrying out, for each image element of the gradient comparison image, a check for selection as a contour point, and determining an environment best corresponding to a local environment of the contour point and extending around a comparison point in the gradient x-ray image for all contour points in the at least one gradient comparison image. Local 2D displacement information is determined by comparing the contour points with the associated comparison points, and motion parameters of a 3D motion model describing a movement of the target region between the acquisition of the image dataset and the x-ray image are determined from the displacement information and a registration transformation describing the registration.

The invention discloses a reinforced mortar and a preparation method thereof, wherein the reinforced mortar comprises cement mortar, carbon dioxide releasing resin balls and calcium carbonate powder. The carbon dioxide releasing resin ball includes superabsorbent resin particles and a carbon dioxide-containing aqueous solution absorbed in the superabsorbent resin particles, and the carbon dioxide-containing aqueous solution is generated by mixing and reacting acetic acid and an aqueous bicarbonate solution. By fixing carbon dioxide inside the mortar, the invention accelerates carbonization, thereby enhancing the mechanical strength of the mortar and improving the crack resistance of the mortar. In addition, calcium carbonate powder is also added, which can effectively accelerate the hydration of cement, improve the strength of the mortar, and at the same time have the effect of fixing carbon dioxide. Moreover, the preparation method of the reinforced mortar is simple, quick, convenient to use, and can be widely processed, prepared and used in various construction environments and processing plants.

The invention relates to a modified double-toroid secondary enveloping toroid worm gear pair and a manufacturing method thereof. The technical scheme of the manufacturing method disclosed by the invention comprises the following steps of: grinding and spreading a toroid worm gear blank (1) by a double-toroid disc-shaped grinding wheel (2), wherein the process center distance is ad=a+delta a, and the process transmission ratio is i1d=i12+delta i; and adopting pure center distance profiling or adopting comprehensive profiling, determining profiling parameter ad and i1d by a trial method, calculating a worm gear engaging-out end reflecting line, and ensuring that the worm gear engaging-out end reflecting line can completely enter a first conjugate subarea of a worm wheel tooth surface. The cutting gear of a worm wheel is same as the relative standard transmission, only that a generative face of an applied toroid hob is consistent with a spiral surface of the modified worm gear. Accordingto the modified double-toroid secondary enveloping toroid worm gear pair disclosed by the invention, the worm wheel tooth surface does not exist a secondary contact area and can utilize the full length of a worm gear, a worm gear engaging-in end of the worm gear can keep the certain double-line contact length, and the manufacturing process is simpler and more flexible; and the modified double-toroid secondary enveloping toroid worm gear pair can also naturally inherit the advantages of standard double-toroid sedondary enveloping transmission.

The invention discloses an AGV layout method and system, electronic equipment and a storage medium. The method includes: selecting a seed point in the storage location set; dividing the storage location points in the storage location set into storage location groups, the cost from the storage location points included in the storage location group to the corresponding seed point is the lowest, and the cost is based on the storage location. The outbound frequency of the location and the distance between the storage location point and the seed point are determined; respectively determine the center point of each storage location group; judge whether the center point of each storage location group is in the same position as the corresponding seed point, and When the positions are the same, the central point of each storage group is used as the parking point of g AGVs, and the AGV is set to be responsible for transporting items from the storage points included in the corresponding storage group. The invention makes the distribution density of the AGV positively correlated with the outbound frequency of the storage point, thereby reducing the handling time of the AGV, improving the handling efficiency of the AGV, and thereby improving the outbound efficiency of the warehouse.

Disclosed are a light guide plate, a backlight module of a liquid crystal display device, and a device for manufacturing the light guide plate. The light guide plate comprises a first surface and a second surface parallel with each other, wherein the first surface is formed with parallel columnar projections, and the second surface is formed with light guide ports. The light guide plate has a better light convergence effect compared with an existing light guide plate. As a result, light crosstalk in the light guide plate can be significantly attenuated.