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  narrow band
     Chaos arithmetic is used for reducing noise in leaking system,and a new kind of narrow band ultrasonic testing principle is introduced.
     提出了利用混沌算法抑制噪声,采用新型窄频带超声检漏原理来进行泄漏检测的新方法。
短句来源
     Chaos arithmetic is used for reducing noise in leaking system,and a new kind of narrow band ultrasonic testing principle is introduced.
     提出了利用混沌算法抑制噪声,采用新型窄频带超声检漏原理来进行泄漏检测的新方法。
     Method Sound pressure level at eardrum and outlet of external auditory canal in 30 young people(60 ears) were measured by Audio Scan RM500 at 50 dB SPL narrow band noise with different frequencies(0.25~8.00 kHz).
     方法 在 5 0dBSPL稳态窄频带噪声声压下 ,分别于 0 .2 5~ 8.0 0kHz用AudioScanRM5 0 0测量 30人 ( 6 0耳 )外耳道口及鼓膜处的声压值 ,比较各个频率段外耳道口和鼓膜处声压差值的差异。
短句来源
     The noises on low- voltage power networks are classified four types including background noise,periodic noise,burst noise and narrow band noise.
     低压配电网电力线噪声可以分为背景噪声、与工频同步的周期性噪声、突发性噪声、窄频带噪声等。
短句来源
     The HR-FA method can be usedto analyse the structure of the spectrums of signals in any narrow band on the fre-quency axis with designated and sufficient frequency resolutions.
     它可以指定的、足够高的频率分辨率分析频率轴上任一窄频带内信号的频谱结构。
短句来源
更多       
  narrow frequency band
     The optimum frequency of the signal source is hard to be determined by means of calculation since some of the materials are sensitive to the microwave with a certain frequency or very narrow frequency band.
     由于有些材料对某个频率或极窄频带的微波特别敏感 ,信号源的最佳频率一般理论计算难以确定。
短句来源
     Several shortcomings of SRR suggested by Pendry resist the practice of LHM. The composite structure of SRR and wires has the disadvantages of high loss and narrow frequency band.
     Pendry所提出的应用SRR和金属线实现的左手媒质结构有几个明显缺陷,高损耗,窄频带,相对大的结构尺寸使得这个结构还不能进入实用阶段。
短句来源
     By using the trace and search switching circuit,the system is able to trace within the narrow frequency band range and search within the wide frequency band range. Thus,the system features high sensitivity and strong resistance to interference. The experiments have proved that when the system follows the signal of Doppler frequency,it will not follow incorrectly the strong interference signal of adjacent frequency modulation.
     提供一种在噪声背景中可靠测量多普勒频谱信号中心频率值的方法.将锁相理论应用于干扰情况下的多普勒频率测量系统,利用跟踪搜索转换电路,实现了在窄频带内跟踪、宽频带内搜索,使系统具有抗干扰能力强、灵敏度高等优点.实验表明,当系统跟踪多普勒频率信号后,对较强的邻频干扰信号,不产生错误跟踪
短句来源
     From some characteristics observed,such as the short lift time, narrow frequency band, fast frequency drift, quasi-periodic pulsation, spike event and complex magnetic structure,it is considered that the radiation mechanism of these events may be principally due to the electromagnetic waves magnified directly by the instable electronic cyclotron.
     从它们的观测特征:短寿命,窄频带,频率快速漂移,及尖峰事件与磁结构复杂的大黑子活动区密切相关等,认为这些事件的辐射机制可能是电子回旋脉泽不稳定直接放大电磁波所致。
短句来源
     The simulative study of the frequency domain character of power system fault current signal shows that the high-frequency signal with narrow frequency band can not better present the character of fault high-frequency transient component.
     对故障电流信号噪声的频谱特征进行仿真研究表明 ,窄频带的高频信号不易很好地表述故障高频暂态分量的特征。
短句来源
  narrow frequency
     The optimum frequency of the signal source is hard to be determined by means of calculation since some of the materials are sensitive to the microwave with a certain frequency or very narrow frequency band.
     由于有些材料对某个频率或极窄频带的微波特别敏感 ,信号源的最佳频率一般理论计算难以确定。
短句来源
     Narrow frequency and sharp angular defect mode of one-dimensional photonic crystals in visible and near-infrared
     可见光波段一维光子晶体窄频带锐角度缺陷模
短句来源
     The simulative study of the frequency domain character of power system fault current signal shows that the high-frequency signal with narrow frequency band can not better present the character of fault high-frequency transient component.
     对故障电流信号噪声的频谱特征进行仿真研究表明 ,窄频带的高频信号不易很好地表述故障高频暂态分量的特征。
短句来源
     From some characteristics observed,such as the short lift time, narrow frequency band, fast frequency drift, quasi-periodic pulsation, spike event and complex magnetic structure,it is considered that the radiation mechanism of these events may be principally due to the electromagnetic waves magnified directly by the instable electronic cyclotron.
     从它们的观测特征:短寿命,窄频带,频率快速漂移,及尖峰事件与磁结构复杂的大黑子活动区密切相关等,认为这些事件的辐射机制可能是电子回旋脉泽不稳定直接放大电磁波所致。
短句来源
     Several shortcomings of SRR suggested by Pendry resist the practice of LHM. The composite structure of SRR and wires has the disadvantages of high loss and narrow frequency band.
     Pendry所提出的应用SRR和金属线实现的左手媒质结构有几个明显缺陷,高损耗,窄频带,相对大的结构尺寸使得这个结构还不能进入实用阶段。
短句来源
更多       
  “窄频带”译为未确定词的双语例句
     The amplitude distribution of narrow hand semiconductor noise in junction type OC70, OC71 and point contact type 2N32A transistors were measured experimentally by the "maximum amplitude" method.
     本文中描述用振幅峰值的方法,测量面接触型晶体管OC70,OC71和点接触型晶体管2N32A内窄频带低频率噪声的振幅分布。
短句来源
     It is found that the amplitude distribution of nai-row band semiconductor noise agrees with that of the normal law distribution.
     测量结果证明窄频带晶体三极管噪声的振幅分布,和遵守正态律的振幅分布相符合。
短句来源
     The experimental results show that the single transverse mode narrow bandwidth laser output can be obtained while maintaining a high lasing efficiency.
     实验结果表明:该激光系统能获得基横模、窄频带和高效率的激光输出。
短句来源
     The factitious damping is introduced in the forward method, and with the increasing of time interval and natural frequency, the method completely fails to reproduce the narrow-band response.
     单边差分方法在计算单自由度系统地震动力反应中引入了较大的人为阻尼,随着采样间隔及自振频率的增大而不能生成窄频带反应,系统的相位也会发生较大的畸变。
短句来源
     High avilability frequency band, small adjacent- channel interference and optimum transmission performance. The system is advantage over other FM styles. This paper discuss the working principle and achieving method of TFM.
     此技术的最大优点是信号功率谱主瓣窄,频带利用率高,邻道干扰小,又可获得最好的数字传输质量,这是一般调频技术所无法比拟的,本文详细论述了TFM技术的工作原理,实现方法.
短句来源
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  narrow band
Subsequent nonlinear processes start to appear in a sufficiently narrow band of relative values of the perturbation amplitudes (1-2% of the external flow velocity) and progress quite stormily.
      
The aim of the investigation was to extend the narrow band method [3] to forced wave motions and to verify the results experimentally.
      
According to this model, the narrow band is attributed to the spherical metal layer adsorbed on the wall of the cavity containing the AgCl melt.
      
Quasiclassical scattering of wave packets on a narrow band in which the potential rapidly changes
      
The typical narrow band of Np(IV) aqua ion occurs at 732.2 nm; in hydroxy complex, it is shifted to 729.5 nm and its intensity decreases by a factor of about 2.7.
      
更多          
  narrow frequency band
The second stage was manifested in a localized synchronization between the frontal and left temporal (Wernicke's) areas in the narrow frequency band about 17 Hz only during search for associations.
      
For the first time, the forward-scattering location is implemented with the use of long probing pulses in a narrow frequency band.
      
The method is based on measuring the complex frequency response of the propagation path for a narrow frequency band within which the frequency response is governed by the desired parameters of the medium.
      
This may cause the resonance interaction between BVMSW modes of equal evenness in a narrow frequency band Δ~b near f0.
      
Displacement noise can be arbitrarily reduced in a narrow frequency band.
      
更多          
  narrow frequency
The second stage was manifested in a localized synchronization between the frontal and left temporal (Wernicke's) areas in the narrow frequency band about 17 Hz only during search for associations.
      
The results of this study are consistent with current concepts that the θ and α activities in narrow frequency bands reflect the activity of multifunctional neuronal networks selectively associated with processes of cognitive and affective activity.
      
A complex dynamics of spatial frequency processes (coherence and spectral power of biopotentials) with different pattern of changes within narrow frequency EEG bands.
      
For the first time, the forward-scattering location is implemented with the use of long probing pulses in a narrow frequency band.
      
The method is based on measuring the complex frequency response of the propagation path for a narrow frequency band within which the frequency response is governed by the desired parameters of the medium.
      
更多          


The amplitude distribution of narrow hand semiconductor noise in junction type OC70, OC71 and point contact type 2N32A transistors were measured experimentally by the "maximum amplitude" method. It is found that the amplitude distribution of nai-row band semiconductor noise agrees with that of the normal law distribution.

本文中描述用振幅峰值的方法,测量面接触型晶体管OC70,OC71和点接触型晶体管2N32A内窄频带低频率噪声的振幅分布。测量结果证明窄频带晶体三极管噪声的振幅分布,和遵守正态律的振幅分布相符合。

The high resolution problems of amplitude spectrum and phase spectrum for theresponse signal of structure are discussed from the viewpoint of modal analysis.The present paper introduces the HR-FA method which has been perfected bythe authors on the basis of a thorough research into Zoom FFT,a Fourier analysismethod used to obtain the zoom amplitude spectrum.The HR-FA method can be usedto analyse the structure of the spectrums of signals in any narrow band on the fre-quency axis with designated and sufficient...

The high resolution problems of amplitude spectrum and phase spectrum for theresponse signal of structure are discussed from the viewpoint of modal analysis.The present paper introduces the HR-FA method which has been perfected bythe authors on the basis of a thorough research into Zoom FFT,a Fourier analysismethod used to obtain the zoom amplitude spectrum.The HR-FA method can be usedto analyse the structure of the spectrums of signals in any narrow band on the fre-quency axis with designated and sufficient frequency resolutions.This highly accuratemethod has a high signal-noise ratio and saves much calculation time.Also,theconditions in which the zoom phase spectrum is obtained are proved and the wayfor implementing this method is presented.The block diagram of the program is given together with the calculated resultswhich coincide well with the theoretical values.

本文从模态分析的角度讨论了结构响应信号的幅值谱和相位谱的高分辨率问题。文章介绍了作者在对 Zoom FFT 方法进行深入研究的基础上进一步完善了的 HR-FA 方法——一种用于获得细化幅值谱的付里叶方法。它可以指定的、足够高的频率分辨率分析频率轴上任一窄频带内信号的频谱结构。该法具有精度高、S/N 大、节省运算时间等特点。同时论证了获得细化相位谱的条件并提出了实现方法。给出了程序框图及计算结果。理论值与模拟分析之间有良好的一致性。

In this paper a numerical coding and experiments to simulate the propagating

本文通过对宽频带及窄频带激光束的传输进行的模拟计算与实验,比较了相干光与部分相干光的传输性质。作者认为宽频带激光束的传输技术是克服当前用于激光核聚变的固体高功率钕玻璃激光器亮度的受限的重要新途径。

 
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