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Three-phase rectifier topology is given first, on this basis, analyzing the differences of seven-segment SVPWM modulation method and five-segment SVPWM modulation method, and show two kinds of duty ratio calculation formula in different sectors. And then consider the influence of DC-bus voltage, temperature and the IGBT junction temperature on the loss of IGBT, giving different calculation methods...
Fishnet metamaterials consist of two or more conducting fishnet layers separated by homogeneous dielectric layers. Different from other planar multilayer metamaterial structures fishnet metamaterials do not require vias for through-contacting between the layers. This allows low-cost production of three-dimensional metamaterials by spray coating with organic (carbon nanotubes CNTs) or metallic (silver)...
The concept of numerical complete similarity ship model is present with the introduction of virtual fluid kinetic viscosity and virtual acceleration of gravity. This concept is verified by the total resistance calculation of the numerical complete similarity model with different length-to-breadth ratio and block coefficient. It is shown that, this complete similarity calculation method has well stability,...
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