Huazhong University of Science and Technology

Wuhhan Kotel Big Date Corporation

University of Michigan

Cheng Zhang

Lingjie Jay Guo

Xiaoyan Liu

Hao Gao

Zeyang Liu

Shuhong Huang

Yanping Zhang

Yuejun Luo

Fen Liu

Xuan Wang

Disclosed is a type planar-waveguide-based multi-channel crosstalk-free metasurface holographic devices, including a glass planar waveguide and a metasurface above the glass planar waveguide; light propagates inside the planar waveguide in the form of total internal reflections and illuminates the metasurface; the metasurface is capable of selectively projecting multiple crosstalk-free and independent holographic images according to different combinations of circular polarization state and azimuth angle of the total internal reflection incident light inside the waveguide. The device utilizes two properties of incident light, namely the state of polarization and the angle of incidence, and can selectively project multiple independent crosstalk-free holographic images according to the state of polarization and the propagation azimuthal angle of the total internal reflection light in the waveguide. In addition, the device has broadband operational property, such that the projected target images can have different colors.

Planar-waveguide-based multi-channel crosstalk-free metasurface holographic device

A matching algorithm and device for data with different scales based on global road network features are provided. The method includes: loading data of different maps, constructing crossroad groups in each map, and extracting information on attributes of the crossroad groups; allocating, according to the importance degree of the attribute information, weights for each attribute of the crossroad groups, and comprehensively evaluating confidence values of matching between two crossroad groups in different maps; and constructing, according to the confidence values, matched road networks, calculating total confidence values of the matched road networks, and selecting a road network with the highest total confidence value as an optimal matching solution, namely a matching result.

Matching algorithm for data with different scales based on global road network features

A method and system for constructing a transverse topological relationship and a memory are provided. In the method, lane group data in a high-definition map is acquired; for each lane group, a shared boundary line group of two adjacent lanes is sequentially extracted, and the number of parallel boundary line elements is determined; if the number is 1, a transverse topological relationship between the two adjacent lanes is not generated, otherwise the number and types of boundary line units on the parallel boundary line elements are determined; and if the number of the boundary line units is 1, the transverse topological relationship between the two adjacent lanes is generated, otherwise segmentation processing is performed on the lane group along a lane direction, and the transverse topological relationship between two adjacent lanes in each of segments, which are obtained by the segmentation processing on the lane group, is sequentially generated.

Method, system and memory for constructing transverse topological relationship of lanes in high-definition map

The invention belongs to the technical field of solar thermal power generation equipment, and discloses a combined solar thermal power generation system. The system comprises a parabolic trough collector subsystem, a heat exchanger subsystem, a Rankine cycle power generation subsystem and a dish power generation subsystem; the parabolic trough collector subsystem comprises a trough-type mirror field, a pump and a valve; the heat exchanger subsystem comprises a superheater, an evaporator and a preheater; the Rankine cycle power generation subsystem comprises a temperature-decreased pressure reducer, a steam turbine, an electric generator, a condenser, a condensate pump, a deaerator and a feedwater pump; and the dish power generation subsystem comprises a dish-type mirror field and a Stirling engine set. The system utilizes the heat released by the cold chamber of the Stirling engine by condensed fluid of the Rankine cycle. It provides an extra heat source for the Rankine cycle, which increases the power of the steam turbine and improves the solar to electric efficiency of the thermal power generation system.

Combined solar thermal power generation system

Growing community of inventors

Wuhan, China

Cheng Zhang