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By using a virtual campus, users can not only immerse in the campus scene, but also interact with the system, which helps them understand the campus rapidly and deeply. But the virtual campus itself doesn't provide the relevant data information of the campus scene, which severely limits its application to a certain extent. To solve this problem, oriented to Beijing Institute of Petrochemical Technology...
A W-band backward wave oscillator (BWO) based on metamaterial (MTM) slow wave structure (SWS) is presented as a novel high power microwave generator. Particle-in-cell (PIC) simulation is performed to evaluate the efficiency of the W-band MTM-based BWO (MTMBWO), and the MTMBWO can reach saturated output power of 2.78MW with an electronic efficiency of 31.68% at frequency of 84.87GHz.
A 0.38THz Traveling Wave Tube (TWT) based on the sine waveguide and sheet beam tunnel is proposed to amplify the terahertz wave. In this paper, the high frequency characteristics of sine waveguide with sheet beam tunnel are calculated by 3-D high frequency simulation software. From the particle-in-cell simulation results, this beam-wave interaction can produce output power 13W at 0.38THz, and the...
The accuracy and speed of nondestructive testing can be improved by using multiple Lamb wave electromagnetic acoustic transducers (EMATs) instead of a single one. However, the methods for the arrangement of the multiple transducers have been seldom reported. In this paper, the acoustic field excited by the Lamb wave EMAT is described by a 3-D finite element (FE) model. Based on this acoustic field,...
Fast marching methods (FMM) can solve many problems on tracking and capturing moving interface, even some sharp corners and topology changes are being developed. As the well performance in dealing with evolving surface, the FMM has been improved and introduced into three-dimensional (3D) lithography simulation of thick photoresists such as SU-8 photoresist. A stationary level set formulation of lithography...
With the continuous urbanization in China, to meet the demand of current urban 3D cadastre development and management, the necessity and probability of 3D cadastre firstly are discussed, and then according to the building flow of 3D cadastre, key techniques that include data collection, store, management, display and apply are analyzed. And taking an example of Nanjing City, with the introduction...
Dredging simulation is of great significance to the development of dredging engineering technology of harbor, waterway, rivers, lakes, etc. The design and implement of the dredging simulation system are introduced. The modeling and key techniques for the virtual reality of construction site, the movement of dredge vessel, the soil cutting of cutter, and the hydraulic transport of sand in a pipeline,...
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