The hydrodynamic and the drift-diffusion models are the most widely used models to describe semiconductor devices today.
在所有描述半导体的数学模型中，流体动力学模型和漂移扩散模型是应用最广泛的模型。
The testing result discloses that the drift and diffusion function are nonlinear, and the distribution of interest rate does not follow the specification in the parametric models.
结果显示，短期利率扩散过程的漂移函数和扩散函数都是非线性的，短期利率的概率分布不服从参数模型所假设的分布。
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