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In order to investigate the asymmetry of thermal conditions during directional solidification, the temperature evolution and correspondingly developed undercooling in a simplified single crystal blade cluster were numerically simulated. Simulation results demonstrate that the temperature distribution at the blade platforms is obviously asymmetrical. On the outside of the blade which directly faces...
As the semiconductor technology node shrinks to 28 nm and beyond, not only the difficulty of lithographic process becomes higher and higher, the design rule setup is becoming more challenging. As the critical dimension (CD) enters the range that it shrinks faster than the shrink of the coherence length, which is defined by both numerical aperture and degree of coherence in the illumination condition...
Mask 3D effect has been studied in the past and the main characteristic of it is that it will cause positive focus shift to the semi-dense patterns at pitches of 200 and 300 nm for as much as 20–30 nm when a 6% attenuated phase shifting mask (PSM) is used. This has been verified for quite some time until recently, we have found an evidence that it may not be true in case of more complicated two-dimensional...
A general simulation model of the line-start single-phase capacitor-start, capacitor-run permanent-magnet motor (LSSPPM) is constructed by using Simulink in MATLAB according to the analysis of its mathematical model. A user-friendly interactive man-machine interface is designed after masking the model. Finally, the validity of the simulation model is tested and verified via a simulation experiment.
A trapezoidal waveform is usually used instead of the actual back EMF in numerous research literatures on simulation of brushless DC (BLDC) motors, which causes the errors to the simulation and calculation of the motor. This paper adopts the flux linkage changing rate matrixes of the permanent magnets to calculate the back EMF, establishes the mathematical model of a 30 kW six-phase BLDC motor based...
The paper analyses the SVPWM control schema of three-phase inverter employing 120° switch-on mode, proposes a starting control method combined the SVPWM control schema with current regulation adopting the two-point comparator for a sensorless three-phase permanent-magnet (PM) brushless DC (BLDC) motor, establishes the simulation model of the starting control system in Matlab / Simlink environment,...
A kinetics study on the phenol oxidation by catalytic wet air oxidation (CWAO) using aqueous copper nitrate as homogeneous catalyst is presented. Based on the free radical mechanism a kinetics model is established where the electron transfer from copper to phenol is assumed to initiate the formation of free radicals. According to this model, the reaction orders are found to be approximately 1.0, 0...
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