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3 results about "Line source" patented technology
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A line source, as opposed to a point source, area source, or volume source, is a source of air, noise, water contamination or electromagnetic radiation that emanates from a linear (one-dimensional) geometry. The most prominent linear sources are roadway air pollution, aircraft air emissions, roadway noise, certain types of water pollution sources that emanate over a range of river extent rather than from a discrete point, elongated light tubes, certain dose models in medical physics and electromagnetic antennas. While point sources of pollution were studied since the late nineteenth century, linear sources did not receive much attention from scientists until the late 1960s, when environmental regulations for highways and airports began to emerge. At the same time, computers with the processing power to accommodate the data processing needs of the computer models required to tackle these one-dimensional sources became more available.
A tight-fitting field device for a roll-off cylindrical wave
The application discloses a crimped cylindrical wave tight field device, which mainly comprises a crimped parabolic cylindrical reflector, a feed source, a quiet zone and a virtual line source. The parabolic cylindrical reflector can correct the cylindrical wave formed by the spherical wave emitted by the feed source in the quiet zone. In order to control the diffraction of the edge of the reflector, the edge of the parabolic cylindrical reflector needs to be processed. The crimped edge of the parabolic cylindrical reflector can reduce the low-frequency limit of the cylindrical wave tight field. Compared with the sawtooth cylindrical wave tight field, the electric size of the reflector working at the low-frequency limit is smaller, and the engineering realization of the large cylindrical wave tight field is more favorable.
Owner:BEIHANG UNIV
Buried pipe group heat transfer simulation method considering hydraulic-geological boundary geometric mismatch
PendingCN122087242AImprove forecast accuracyReduce meshingComplex mathematical operations3D modellingComputational modelEngineering
The invention discloses a buried pipe group heat transfer simulation method considering hydraulic-geological boundary geometric mismatch, and belongs to the technical field of geotechnical engineering and underground energy storage. The method comprises the following steps: identifying a spatial relationship between an underground water level interface and a geological layering interface based on a geometric algorithm, executing in-layer sub-layer discretization processing, and generating a calculation sub-layer sequence with a hydraulic attribute mark; whether geometric mismatch exists or not is judged by comparing the depth of the top and bottom plates of each geological layer with the buried depth of the underground water level; constructing a composite analytic calculation model, and performing full space-time coupling solution on the transient thermal network in the borehole and the external heterogeneous moving finite line source field; and outputting a long-term thermal response prediction result, and performing optimization evaluation on the buried pipe system layout based on prediction data. According to the method, the complex boundary condition that the underground water level line does not coincide with the geological stratified interface is accurately described, and full coupling calculation of transient heat transfer in the pipe and stratified non-uniform convection-diffusion heat transfer outside the pipe is achieved.
Owner:ZHEJIANG UNIV
A metasurface-based beamforming array antenna
The application discloses a kind of based on metasurface beamforming array antenna, the antenna array surface includes multiple column line sources, each column line source includes a power division feed network and multiple antenna radiation units, the antenna radiation unit is connected with the power division feed network by metallization feed hole, and the power division feed network is fed to the antenna radiation unit by the metallization feed hole;The metasurface is loaded on the antenna array surface, and the amplitude and phase of the electromagnetic wave radiated by the antenna array surface are regulated and controlled.By the above-mentioned optimization design of metasurface beamforming array antenna, phase scanning and metasurface beamforming are combined, one-dimensional array shaping and one-dimensional phase scanning are realized, beamforming and beam rapid scanning are realized, and the integration design of antenna array surface, power division feed network and metasurface loading is low in cost, and the profile height of the whole array surface is greatly reduced.
Owner:CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST