通过对流体的局部、瞬时守恒方程进行系综平均，得到了双流体模型的基本方程。
The basic equations of two-fluid model have been developed byapplying ensemble averaging to the local instantaneous conservation equations.
利用系综平均的方法，计算了在单峰高斯分布适应面上准物种的浓度分布和误差阈。
By ensemble average method, the concentration distribution and error threshold of quasispecies on single peak Gaussian distributed fitness landscapes were evaluated.
得到了在光纤中传输的脉冲光功率的系综平均值和输出脉冲宽度的均方根值的近似解析公式。
Formulas are derived for the ensemble average of the pulse power and the RMS pulse width.
然而，由于要进行系综平均，即使要得到最简单的双稳态系统的信噪比曲线也需要很长时间的运算。
It takes a long time to get the SNR curve of a simplest bistable system because the ensemble average must be applied to the system.
考虑到有机体的生存环境通常存在许多不确定因素，我们用系综平均的方法给出准物种和误差阈的数值模拟。
Considering various uncontrollable factors in the living environment, we use the ensemble average to give the simulation of quasi-species and error threshold.
通常量子力学中的概率性和平均值公式来源于双波描述对某类系综的平均结果。
The probability and the formula to calculate mean values in ordinary quantum mechanics comes from the average of double wave description over a certain ensemble.
在量子统计中，对统计系综引入了密度算符，力学量的平均值可以利用密度算符求出。
In the quantum statistical theory, the density operator is introduced in the statistical system. The expectation value of an obeservable can be obtained by the use of the density operator.
在量子统计中，对统计系综引入了密度算符，力学量的平均值可以利用密度算符求出。
In the quantum statistical theory, the density operator is introduced in the statistical system. The expectation value of an obeservable can be obtained by the use of the density operator.
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