查询词典 equation of motion

Using spin wave theory and the equation of motion technique for the Green function,specific heat of ferromagnetic antiferromagnetic double layers at low temperature is investigated.

在考虑声子之间相互作用的同时，本文应用线性组合算符和微扰法研究了电子自旋对弱耦合二维磁极化子特性的影响。

In the aspect of the study of the application of HHT method, This dissertation has done three part of jobs: first, the Elcentro strong ground motion which is in common use in earhtquake engineering is analyzed by HHT method, getting its amplitude-frequency-time distribution and the comparison between the HHT marginal spectrum and Fourier spectrum is also made; second, the typical nonlinear system defined by the Duffing equation is analyzed by HHT method, getting its numerical value's amplitude-frequency-time distribution and the comparison between the HHT marginal spectrum and Fourier spectrum is also made; third, define the stationary degree of non-stationary signals making use of 3-D time-frequency spectrum and marginal spectrum, the stationary degree curve of Elcentro seismic recording is protracted according to its defining formula, the stationary degree curve of Elcentro seismic recording which change with time is protracted according to similiar definition.

在HHT方法的应用研究方面，本文做了三部分的工作：首先，利用HHT方法分析了地震工程中常用的Elcentro非平稳强震记录，得到了该记录的振幅－频率－时间分布特性，并将得到的边际谱与傅立叶谱做了比较；其次，应用HHT方法分析了典型的非线性系统－Duffing方程，得到了该方程数值解的振幅－频率－时间分布特性，并将得到的边际谱与傅立叶谱做了比较；最后，利用三维时频谱与边际谱定义了非平稳信号的平稳度，并依照其定义式绘制了Elcentro地震波记录的平稳度曲线，依照类似与依赖与频率变化的平稳度定义，初步尝试编程绘制了Elcentro地震波随时间变化的平稳度曲线。

According to this algorithm, the target motion in three-dimensional space is described by a nonlinear state equation, including tangential and normal accelerations.

在分析雷达对远距离机动目标跟踪速度精度要求和存在困难的基础上，提出了一种提高三坐标雷达速度估计精度的滤波算法。

Starting from the classical motion equation of a domain wall in the ferromagnetic system, the analytic wavefunction was obtained by using canonical quantization method and unitary transformation .

从铁磁畴的能量方程出发，利用正则量子化方法和么正变换技术，解析地求得了磁畴量子化运动的波函数。

For these reasons,the following study work has been finished in this paper.(1)Basic equation of saturated-unsaturated seepage is built based on seepage continuity and motion Equations,which take saturation zone and unsaturation zone into account together and avoid difficult problems of traditional numerical solution,such as solution of free surface of seepage etc.

对此，本文主要完成了以下研究工作：(1)从渗流连续性方程和渗流运动方程出发，阐述了饱和—非饱和流统一的渗流基本方程，将饱和区和非饱和区统一来考虑就避免了求解渗流自由面等传统的数值求解的棘手问题。

Torpedo ; Variable thrust ; Equation of motion

鱼雷；变推力；运动方程

Thus this paper first introduces a general approach to continuous element methods for one-dimensional structures,in which the continuous element methods is computed numerically and directly from the transfer matrix from the state vector equation of motion of a structure.

因此，介绍一维结构的连续单元法的一般方法：由结构运动方程建立状态向量方程和利用单元传递矩阵得到单元的刚度矩阵。

Based on the principle of mass-changing mechanics,this paper analyzes the process of water wheel raising water,educes its movement differential equation s in its three stages from starting to stable running,obtains solutions of the equations,and calculates on the angular velocity of the waterwheel in constant motion.

应用变质量力学原理对农用水车在提水过程中所经历的三个不同阶段，即在运动过程中水车的受力和运动量都在发生变化的情况下，对其动力学问题进行了较为深入的分析，导出了水车由起动至稳定运转三个阶级的运动微分方程，并得到了它们的解答，进而求得水车在趋于定常运动时的转动角速度。

The single-particle transverse equation of motion with nature focusing in Wiggler and PCM is discussed.

因为Wiggler磁场和PCM磁场不能从根本上抑制椭圆带状束的Diocotron模。

The paper describes theory of beam noise reduction in adiabatically varying magnetic field, deduces the relation between magnetic field and noise , gives out fourth order Runge-Kutta formula of 2-order differential equation, simulates the effects of different magnetic field on electron motion, the results show good agreement with theory analysis,it confirms that adiabatically varying magnetic field near the cathode can reduce the beam noise.

文章描述了回旋波保护放大器电子束绝热降噪的机理，推导了噪声与磁场的关系和二阶微分方程的四阶精度龙格－库塔法求解电子运动方程的公式，编程计算了电子在不同磁场中的运动轨迹，模拟了不同磁场对电子运动的影响，模拟结果与理论分析相符合，证实了阴极表面附近的缓降磁场可以降低电子束的噪声。

The United Kingdom has pledged to provide technical assistance to the peacekeeping effort in Darfur, including airlifting supplies and equipment to assist the African peacekeepers.

英国承诺为达佛的維和努力提供技术帮助，包括提供非洲的維和部队空运补給和裝备。

Results: The level of ET-1mRNA in placental villus was significantly higher in pre-eclamptic women than that in control group.

结果：妊高征组患者胎盘绒毛组织ET-1 mRNA的表达较正常妊娠组明显增高。