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Mesh generation is the prerequiste of Finite Difference Time Domain (FDTD) method. In this paper, singular points in mesh is classified and a new strategy is proposed to deal with these points directly. In addition, a parallell algoritm is implemented with OpenMP to accelerate the mesh process. In the end, a test example is provided to verify the accuracy and efficiency of the proposed improved algorithm.
Traditional life evaluation method mainly attached to electrical parameters as reliability characterization parameters, ignoring the negative effects that the potential defects have on reliability evaluation of components. To reflect the differences between the individual samples, the failure modes and failure mechanisms of the optocouplers in storage environment is summarized and analyzed. The characterization...
A novel process of extracting niobium, yttrium, and cerium from a low-grade niobium-bearing ore by the roasting (NH4)2SO4-Na2SO4-H2SO4 system was experimentally studied. The influences of various factors, such as roasting temperature, roasting time, mass ratio of agents-to-ore and particle size fraction on the extraction of valuable metals were comprehensively investigated. It is found that the roasting...
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