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frequency response characteristic    
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  frequency response characteristic
It is shown that diffusants which take part in surface reactions of finite rate or are subject to reversible trapping within the solid have a frequency response characteristic of the process involved.
      
A composite method to determine the tapping coefficients along with the coefficients of the subfilter to approximate overall frequency response characteristic is proposed.
      
Theoretical studies have been made on the effective ionization rates of electrons and holes of the device, I-V characteristic and the frequency response characteristic of the AlxGa1-xAs/GaAs superlattice p+-i-n+ structure.
      
Probe bandwidth refers to the frequency response characteristic of a probe and specifies the normal operating frequency range of the probe.
      
In contrast to this, phonograph preamp circuits not only scale the signal, they also impart a specific frequency response characteristic to it.
      
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In this paper, the maximum entropy spectrum and band-pass filtration method has been applied to the process and analysis of the observed geothermal data for about six years at the Baijiatuan well, Beijing. The result shows that ther is abundant information of seismo-geothermal precursors in the frequency domain. There is a certain relationship between the characteristics of natural frequency of the well-water bearing layer system and the earthquake activity. The amplitude of geothermal anomaly...

In this paper, the maximum entropy spectrum and band-pass filtration method has been applied to the process and analysis of the observed geothermal data for about six years at the Baijiatuan well, Beijing. The result shows that ther is abundant information of seismo-geothermal precursors in the frequency domain. There is a certain relationship between the characteristics of natural frequency of the well-water bearing layer system and the earthquake activity. The amplitude of geothermal anomaly during some periods shows fairly good corresponding relation to the earthquakes with Ms≥4.0 within the range of 200 km. Especially, prior to the earthquake with Ms =6. 1 occurred on Oct. 18, 1989 at Datong, the medium and short-term as well as the imminent geothermal anomalies were revealed by using this method.In addition, the material condition is also discussed for the well-water bearing layer system to produce the frequency response characteristics.

利用最大熵谱和带通滤波方法分析处理了北京白家疃井约6年的地热观测资料。结果表明,在频率域上有丰富的地热地震前兆信息;井—含水层系统的固有频率特性与地震活动存在一定关系。某些周期的振幅异常与200km范围内M_L≥4.0地震有较好的对应关系,特别是1989年10月18日大同M_s6.1地震前,用本方法处理地热观测资料,发现有明显的中期、短期和临震异常。 文中讨论了井—含水层系统产生响应频率特性的物质条件。

It is our goal in this paper to develop a new model for creating fictitious point masses in order to evaluate the exterior disturbing potential fast and precisely.The main principle of this model is that based on the frequency response of interior source to the exterior disturbing potential, the group of point masses is divided into sevaral subgroups so that each of them has the spectrum characteristic responding to definite frequency component of the exterior potential.Frequency response...

It is our goal in this paper to develop a new model for creating fictitious point masses in order to evaluate the exterior disturbing potential fast and precisely.The main principle of this model is that based on the frequency response of interior source to the exterior disturbing potential, the group of point masses is divided into sevaral subgroups so that each of them has the spectrum characteristic responding to definite frequency component of the exterior potential.Frequency response characteristics of point masses will make the so-called Runge phenomena, divulgence and frequency increment, coming from conventional point masses model, considerably reduced so that the precision of approximating the exterior potential can be improved a lot.In the paper, the principle and constructing method of the frequency response point masses model has been discussed in detail, and finally, the precision of the model has also been analyzed and evaluated.

本文提出一种新的虚拟质点建模方式,旨在实现地球外部重力场的快速精密赋值.其基本思想在于:根据内部场源与外部场的频谱响应关系,视质点系为若干子系组成,让其中每个子系具有与外部场的相应频段分量响应的谱频特性.质点系的频谱响应性质将会大大削弱通常质点模型产生的所谓且Runge现象:泄漏与增频,从而显著提高逼近精度.文中还详细讨论了频谱响应质点模型的原理和构制方法,并对模型精度进行了分析和估算.

In order to probe into the anti-friction mechanism and effectiveness of turbulent zone of flexible pipe,extensometer with high accuracy and high-frequency response characteristics is used to study the frequency variation feature of flexible pipe's outer diameter with Reynolds number.The research result demonstrates that along with the increment of Reynolds number,the root mean square value of outer fluctuating magnitude of the external diameter in full frequency band increases,the root mean...

In order to probe into the anti-friction mechanism and effectiveness of turbulent zone of flexible pipe,extensometer with high accuracy and high-frequency response characteristics is used to study the frequency variation feature of flexible pipe's outer diameter with Reynolds number.The research result demonstrates that along with the increment of Reynolds number,the root mean square value of outer fluctuating magnitude of the external diameter in full frequency band increases,the root mean square value of fluctuating magnitude of the external diameter in high frequency band decreses,demonstrating that the fluctuation of flexible pipe wall changes fluctuation flow field of original rigid pipe,large-size eddy motion increases and smallsize eddy motion decreases,this reduces energy loss and increases friction reduction effectiveness.

为探讨柔性管的紊流区域减阻效果的产生机理,采用高精度高频率响应特性的应变仪对柔性管外径随雷诺数的频率变化特性进行了研究。研究结果表明:随着雷诺数的增加,全频带的外径脉动的均方根值加大,但高频带外径脉动的均方根值减小,说明柔性管管壁脉动确实改变了原刚性管的脉动流场,大尺度涡的运动加剧,低尺度涡运动减弱,从而使得能量损失减少,减阻效果增大。

 
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