根据建立的液压蓄能器数学模型，采用龙格-库塔数值方法对液压蓄能器在存储和释放能量过程中的能量损失进行了分析。
Energy loss of hydraulic accumulator during energy storage and reuse was analyzed using Runge-Kutta method according to its mathematical model.
利用快速傅里叶变换法加龙格-库塔法对期权的最佳执行价格进行了分析和计算，最后通过数值算例说明了这一方法的有效性和准确性。
This paper analyses and computes the optimal exercise price of the American put option, by using the "FFT-RK" method. At last, numerical examples show that this method is efficient and accurate.
采用龙格-库塔数值方法计算了气泡脉动半径、周期及水中压力，计算结果与实测数据吻合较好。
The radius period of oscillation of the bubble and the water pressures are calculated numerically with Runge-Kutta method. The calculating results are unanimous with that of experiments.
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