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In this paper a method is presented for computing the simplest normal form for a vector field associated with the singularity of two non-semisimple double zero eigenvalues. The method developed here uses the lower order nonlinear terms in the normal form for the simplifications of higher order terms. An explicit formulae are derived, which can be used to compute the coefficients of the simplest normal...
In this paper, we explored a new way for linear circuit transient analysis based on the accompanying network method. This new method is simple and convenient, tries to avoid differential equation from the beginning of the establishment of circuit equations, makes use of accompanying network by which the transient process can be divided into a series of discrete time intervals Δt, replaces the dynamic...
Aiming at the shortage of traditional seasonal variation model, the combination of gray model with self-memory model was proposed for improving traditional seasonal variation model. The application of gray model used to dig out the long time trend and self-memory model to solve problem of non-linearity of the model's seasonal fluctuation. The case study showed that the proposed model has higher precision...
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