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China Academy of Engineering Physics (CAEP) has been developing terahertz vacuum-electronic FWG-TWT amplifier for several years, and much progress has been achieved at 0.14THz, 0.22THz and 0.345THz. This paper presents 0.345THz FWG-TWT's theoretical analysis and 3-D PIC simulation results about electron gun with high area-compression ratio (≥ 25), high-field Periodic Permanent Magnet(≥ 0.45T), high...
Through analyzing the effect factors of error in rapid glass mould manufacturing process, the rapid tooling precision control system has be researched. Using of computer simulation of metal casting process to compensate size changes, and using electrical discharge machining eliminate mold roughcast making process of size change, the rapid mould manufacturing process chain error can be considered as...
During the Underground Construction, the ground surface and the building near the construction site would be impacted and the deformation would occur. The empirical deformation forecast methods, as the simple, useful, and more efficient deformation prediction methods, are widely used in Engineering Investigation. We develop the Underground Construction Deformation Display System (UCDDS) basing on...
In this paper, based on the theory of two-dimensional (2-D) orthogonal polynomials, the function of dynamic load is fit by using the primary functions. The fitting coefficients are identified through finite element analysis. The identification method of distributed dynamic load is found. Space mapping is used to reduces the dimension of the model, while the box-structure which bears the distributed...
Combine the actual situation of stope collapse area 56-7# of Dongguashan Copper Mine in china, three-dimensional dynamic monitoring the collapse area twice using Cavity Monitoring System (CMS), taking collapse area measured data as foundation, collapse area three-dimensional model created using Surpac and gain three-dimensional configuration and the actual boundary of the collapse area accurately...
Three-dimension (3D) modeling and visualization of stratum plays important role in seismic active fault detection, of course in geoinformation science. Well-logging data of strata is taken as time series. Similarity measure of subsequence search is proposed based on dynamic time warping (DTW). Realizing time series match in different length of time series. The frequent pattern mining experiment is...
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