查询词典 undamped wave

Methods The clinical manifestations and the plasma ammonia levels were analyzed in l7 patients with HE , who underwent EEG , CT and MRI examinations Results Fifteen patients had abnormal EEG findings characterized by lowered basic rhythm, moderate to high amplitude θ wave activity, and sporadic δ wave and triphasic wave Fourteen patients had abnormal MRI findings , including increased signal in the bilateral globus pallidus (14/17), putmen (4/17) and tegmentum of the midbrain (7/17) in T1WI without corresponding alterations in the signal Intensity in T2WI T2 FLAIR demonstrated increased signal in the bilateral white matter of the cerebral hemispheres.

总结17例各种原因引起的肝性脑病患者的临床表现、血氨水平，对全部病例进行EEG、颅脑CT、MRI检查。结果 17例肝性脑病患者EEG异常15例，主要表现为：基本节律慢化；中波～高波幅θ活动；散在的δ波、三相波。

A theoretical formula for wave-pattern resistance, i. e., a statistical mathematical model, is developed using the linear wave-making theory. The effect of principal dimensions, vertical centers of transverse sections and the prismatic curve on wave-pattern resistance is studied.

本文用线性兴波理论建立了波形阻力的理论公式，从理论上考虑了主尺度和系数、横剖面形心高及棱形曲线对波阻的影响；根据17艘肥大船模65种状态的实测波形资料，用统计分析法计算得出一组随傅氏数而异的波形阻力预估公式；为使数学模型付诸电算，定义了属统计学范畴的"广义相关系数"。

And this causes a frequency change Δf. The resonant point tracing algorithm describes how to detect Δf. So it can introduce a feedback frequencydifference -Δf through a closed loop to realize the resonant state o In the digitaldetection scenario, using staircase wave to replace saw tooth wave, it can overcome a lot of shortcomings in the analog system. The character of the staircase wave affects the detection precision directly. This thesis analyzes a high precision scenario producing a staircase waveform in detail. It can reduce the number of the bits in D/A converter greatly. This thesis proposes another method to improve the detection precision in case that the A/D converter has comparatively little number of bits, while this method will not increase the cost of the system greatly.

在谐振式光纤陀螺中，环形谐振腔的旋转使得谐振腔的谐振频率发生了变化，从而产生了一个与旋转速度成正比的频率变化值△f，谐振点跟踪算法描述了如何检测出△f，从而可以通过闭环在系统中引入反馈频差-△f，实现光路的谐振状态；在数字闭环检测方案中，用阶梯波作为反馈信号来代替锯齿波，可以克服原来模拟系统中锯齿波的很多缺点，阶梯波的性能直接影响着系统的测量精度，本论文详细分析了一种高精度阶梯波生成方案，使得所需D／A的位数大大降低；本文还分析了A／D转换器对系统测量精度的影响，提出了一种A／D转换器位数较少的情况下提高系统测量精度的措施，同时又不会增加太多的系统成本。

The structure beam response control method based on the traveling wave model was discussed theoretically. The theoretical traveling wave model was applied to a long thin beam with piezocrystal actuators and the traveling wave active control law for the condition of making measurement upstream and performing control downstream was derived and the control compensator formula of the flexural waveguide in the form of transcendental function was deduced.

从理论上探讨了基于行波模型的结构梁响应控制方法，在梁及压电陶瓷作动器处采用行波理论模型，导出了上游测量、下游点施加控制的行波主动控制律及相应的具有超越函数形式的控制补偿器表达式。

Regarding with transverse wave, it includes shear wave and electromagnetic wave.

上述的纵波包括Biot (1962)理论的快波和慢波，而横波包括力学剪力波和电磁波。

The transverse wave is the wave in which the particles, vibration is perpendicular to the wave′s direction of travel.

横波是质点振动方向与波的传播方向相垂直的波，其外形特征是交替出现凸起的波峰和凹下的波谷。

In the regular wave experiment, the transverse error of wave height is less than 2%, the repeated error of the wave height is less than 1.28%and the period repeated error is less than 0.2%.

介绍了实验室的造波机系统和造波特性及其在模型试验中的应用，并讨论了实验室内模拟海浪的检验标准及其方法。

By means of the undetermined coefficient method ,which is submitted in reference for solving nonlinear wave equations for their peaked soliton solutions ,three kinds of peaked soliton solutions are obtained for two important nonlinear wave equations— Korteweg-de Vries equation and Benjamin-Bona-Mahonyequation,respectively. One kind of peaked compacton solution ,which has the characteristics of both peaked soliton solution and compacton solution ,is obtained for above two equations with the aid of transformation relation between triangle function and hyperbolic function,. By use of above solutions, two kinds of periodic peaked traveling wave solutions are constructed.

摘 要：利用文献中提出的求非线性波方程尖峰孤子解的方法，分别求解了两个重要的非线性波方程—Korteweg-de Vries 方程和Benjamin-Bona-Mahony BBM）方程，得到了3类尖峰孤子解；借助双曲函数与三角函数间的变换关系得到了1类尖峰紧孤子解，该型解兼有尖峰孤子解和紧孤子解的特点；在上述结果的基础上构造了2个周期性的尖峰行波解。

The variation of horizontal and uplift forces acting on the unit length of breakwater with attack angle is presented, and the effects of multi-directionality, wave steepness, and relative wave height on wave forces are discussed.

通过试验结果分析，给出了作用在直立堤上的单位堤长波浪力随波向角的变化规律，讨论了波浪方向分布宽度、波陡及相对波高等因素对单位堤长波浪力的影响。

TEM field is slowly changing in middle to deep depth prospecting, which is characterized by unperceivable wave and dominant dissemination, thus it can be assumed to be quasi-static state approximate and the wave equation of electromagnetic wave radiation is retrogressive and replaced by diffusion equation.

在中、深层勘探情况下，TEM场是缓变的，其波动性已经很不明显，扩散特征起支配作用，波动方程退化成了扩散方程。

Methods Clinical data of 3 cases of bile duct injury during laparoscopic cholecystectomy were analyzed retrospectively.

回顾总结3例LC术中胆管损伤的临床资料，分析3例胆管损伤的原因及对策。

These techniques are applied to the gobang.

本文将这些技术用于五子棋中。