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The low frequency and large amplitude hydraulic shocker has a great prospect of being used in no-dig technique.

低频大振幅液压冲击器，以其优越的性能在非开挖施工方面拥有广阔的应用前景。

Design and Analyze of Amplitude Photon Sieve Based on Angular Spectrum Method .

基于角谱法的振幅型光子筛的设计和分析。

Electromagnetic vibrating sifter from the electromagnet, screen, frame, spring contactors etc., using a higher frequency and smaller amplitude of vibration.

电磁震动筛粉机由电磁铁、筛网、架、弹簧接触器等组成，利用较高的频率与较小的振幅产生振动。

Results In the pyramidal neurons voltage-clamped at -60 mV, GABA evoked a transmembrane inward current and the peak amplitude of the current increased sigmoidally with increasing doses of GABA applied. Co-application of lidocaine resulted in a decline of IGABA and the IGABA was 4.05mmol/L.10mmol/L lidocaine resulted in right shift of concentration-response curve arid not only EC50 changing from 7.72mmol/L to 17.2mmol/L but also the maximal current unable to reach the top level.

结果 将钳制电位固定在－60mV，GABA以剂量依赖性方式诱导出内向电流；利多卡因明显抑制GABA诱导的Cl电流I(下标 GABA，50%抑制浓度(IC50)为4.05mmol/L，10mm/L可使GABA浓度效应曲线明显右移，50%有效浓度(EQ50)由7.72mmol/L增加到17.2mmol/L，且最大电流明显降低。

The double～probe pulse echo method, combining the advantages of transmission technique and pulse reflection method, is used to optimize the ultrasonic echo signal amplitude in case of strong attenuation of energy when ultrasonic signal transmitting in solid rocket motor grain.

采用双探头脉冲反射法，综合了穿透法和脉冲反射法的优点，实现了超声信号在固体火箭发动机药柱中传播时能量强衰减的情况下超声回波信号幅值的最优化。

A silent communications system in which nonaural carriers, in the very low or very high audio-frequency range or in the adjacent ultrasonic frequency spectrum are amplitude- or frequency-modulated with the desired intelligence and propagated acoustically or vibrationally, for inducement into the brain, typically through the use of loudspeakers, earphones, or piezoelectric transducers.

一个沉默的联系是不承载听觉，在非常低或非常高音频范围里，或在邻近的超音速的频谱中，这是广阔的-或带有期望的智能并且传播声学的频率调节或振动，为了刺激大脑内部，典型的是通过利用扬声器，耳机，或压电式换能器。

The amplitude-frequency response of a filter was designed according to the power spectral density of platform vibration of SILEX (Semiconductor Inter-satellite Laser Experiment) and Landsat, and then the signals of platform vibration were generated by filtering white Gaussian noise using the filter.

根据SILEX和Landsat平台振动功率谱设计滤波器的幅频响应，通过滤波器对高斯白噪声进行滤波来模拟生成平台振动信号。

Analytical approximate periods and periodic solutions to large amplitude oscillation of a simple pendulum are constructed using a new method.

构造了单摆大振幅振动的高精度解析逼近周期和周期解。

Chapter four studies the chaotic responses in a system consisting of simple pendulum and harmonic oscillator under bounded noise excitation. Firstly, the Melnikov function of the two-degree-of-freedom system under Hamiltonian perturbation is derived. The essential condition of the autonomous system for the probable onset of chaos is obtained, the Poincare maps of the system under small Hamiltonian perturbation and the effect of increasing perturbation on the Poincare maps are studies. Then for the non-autonomous system under damping and harmonic or bounded noise excitation, the largest Lyapunov exponent and Poincare maps are calculated. From the analysis of the largest Lyapunov exponent, the critical criterion for the onset of chaos, and the conclusion that the threshold of bounded noise amplitude for the onset of chaos in the system increases as the intensity parameter of Wiener process increases are obtained. The result from the analysis of Poincare maps is in agreement with that obtained from the Largest Lyapunov exponent. The effect of varying damping coefficient and intensity parameter of Wiener process is also analyzed.

第四章研究了有界噪声激励下的两自由度单摆—谐振子系统的混沌运动，首先推导了该两自由度系统仅在Hamilton扰动下的Melnikov函数，得到该自治系统可能产生混沌的必要条件；研究了该系统在小的Hamilton扰动和增大摄动情形下的Poincare截面；然后对有阻尼、谐和或有界噪声激励下的非自治系统数值计算了其最大Lyapunov指数和Poincare截面；从Lyapunov指数分析得到了这个两自由度系统产生混沌运动的临界条件及产生混沌的临界激励幅值随Wiener过程强度参数值的增大而增大的结论，Poincare截面分析的结果亦符合Lyapunov指数分析的结论；研究了Wiener过程强度参数、阻尼系数变化对Poincare截面的影响。

Assuming the initial shape of a skirt to be an n-sided cylinder, the shape of its bottom edge can be modified by changing the distance between each edge and the centroid of bottom plane according to the amplitude of sine curve at corresponding angle.

所显示是一个n支持的圆筒，它的下缘形状可以被改变每个边缘和底下飞机之间矩心的距离修改根据高度正弦曲线在对应的角度。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。