该滤波器在基频处的幅值无衰减，相位无延时，能将2次以上的谐波全部滤掉。
The filter has no fundamental frequency decay and phase delay, and all harmonics above2nd order are filtered.
该方法使未知输入在故障发生前衰减到几乎处处为零，系统近似为无未知输入的标准系统。
This method can almost get unknown inputs attenuation to zero everywhere before the fault happening, then the system is approximately standard system without unknown inputs.
光衰减器是一种广泛应用的无源光器件。
Optical attenuator is a kind of widely used passive optical component.
可调光衰减器(VOA)是广泛应用于光通信网络及光纤实验系统中的光无源器件。
The Variable optical Attenuator (VOA) is a kind of passive device that find wide application in optical communication network and optical fiber test system.
光纤法珀传感器具有质轻径细、无源、电绝缘、抗电磁干扰、信号衰减小的优点。
Fiber Fabry-Perot sensor has the advantage of light mass, thin diameter, passive, electric insulating, anti electromagnetic interference and low attenuation.
研究微波热疗组织超声衰减系数的温度相关性，以期实现肿瘤微波热疗超声无创测温。
The temperature correlation of ultrasound attenuation coefficient in the organization of microwave hyperthermia is researched in order to achieve non-invasive organization temperature.
在海冰覆盖的条件下，PAR的观测结果与无冰海水的PAR有明显差别。由于海冰选择性的吸收，穿透海冰进入海洋的PAR组分已经不同，海水对PAR的衰减系数也会相应变化。
But under sea ice, the attenuation coefficient of PAR is little bit different, as the spectrum of the light has been changed by selective absorption through the sea ice.
在海冰覆盖的条件下，PAR的观测结果与无冰海水的PAR有明显差别。由于海冰选择性的吸收，穿透海冰进入海洋的PAR组分已经不同，海水对PAR的衰减系数也会相应变化。
But under sea ice, the attenuation coefficient of PAR is little bit different, as the spectrum of the light has been changed by selective absorption through the sea ice.
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