| 1. | Study on discrete noise lnduced by marine propeller
螺旋桨离散谱噪声计算研究 |
| 2. | The long time behavior of fully discrete fourier spectral approximation for nonlinear schr dinger equation with quintic term
方程全离散谱格式的大时间性态 |
| 3. | In this section , let us replace pnf by pnfn + 1 / 2and finally we obtain the stability and convergence of the discrete spectral scheme
最后给出了全离散谱格式的稳定性和收敛性定理 |
| 4. | The result shows that the psd of the electromagnetic pulses consists of a continuous component and a discrete component , with the total power of the two parts being conservative
结果表明，这类电磁脉冲串的功率谱密度由离散谱分量和连续谱分量组成，它们组成的总功率守恒。 |
| 5. | At last , let us put the discrete scheme in the nonautonomouse case , we obtain the long - time priori estimate for the solution of the spectral scheme and the long - time error estimate
在文章最后，我们又将离散系统置于非自治系统情形下，给出了全离散谱格式解的长时间先验估计及长时间的误差估计 |
| 6. | Dual randomized modulation technique is more effective than existing simple random modulation schemes , such as random position modulation or random switching frequency modulation , in dispersing the power spectrum
与已经存在的任何一种单随机方案相比，双随机调制技术驱散谐波能量而使之具有更宽的带宽，能更加有效地减少功率变换器系统的离散谱峰值。 |
| 7. | The low - frequency discrete noise of the propeller is induced by the interaction between blades of the propeller and wake of the marine , and the low - frequency broadband noise of the propeller is produced by the interaction of blades and turbulent field of the marine stern
螺旋桨的低频离散谱噪声是由船尾伴流场和叶片的相互作用引起的，而低频宽带噪声是由船尾粘性湍流场和叶片的相互作用产生的。 |
| 8. | Using a combination method of the lifting surface theory and acoustic technique , the effects of different diameters , skews and rakes on the discrete noise of the propeller are studied by the numerical method and some useful results for engineering are presented in this paper
利用升力面理论和声学方法得到的离散谱噪声的预报公式，对螺旋桨直径、侧斜、纵倾变化对离散谱噪声的影响作了数值计算，并得到了工程上有实用意义的结果。 |
| 9. | Firstly , let us put the discrete scheme in the framework of dissipa - tive dynamical systems . we abtain the long - time priori estimate for the solution of the discrete system and the stability and convergence of the spectral scheme , we also prove the existence of an absorbing set bn in the snn , t in this section we prove attractor an , t existence on discrete systemes { ( sn , t ) n } n > 0
本文最初是将离散系统置于耗散动力系统结构中，研究了全离散谱格式解的长时间先验估计及谱格式解的稳定性和收敛性，并证明了离散系统( s _ ( n , ) ~ n在s _ n上存在吸引集b ~ n |
