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频率
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  frequency
    Photoelectric Measurement of the Frequency of Micro Vibration Signal——An Active Photoelectric Detector of the Twist of Textured Yarn
    微小振动信号频率的光电测定——弹力丝捻度动态光电检測仪
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    AN ANALYSIS OF FREQUENCY RESPONESE OF PRESSURE TRANSDUCER
    压力传感器频率响应的分析
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    THE LIMITATION OF SAMPLING FREQUENCY FROM SYSTEM ERROR IN HYBRID SIMULATION
    混合仿真中系统误差对于采样频率的限制
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    A TRACING SYSTEM OF MICROWAVE RESONANT FREQUENCY FOR MEASURING AVERAGE DENSITIES OF CRYOGENIC LIQUIDS
    测量低温流体平均密度的微波谐振频率跟踪系统
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    A Frequency Control Device with 100 Channels
    100路频率控制装置
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  “频率”译为未确定词的双语例句
    Minimal Displacement-to-Frequency Converter
    微位移-频率转换器
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    An Improvement in the Minimal Displacement-to-frequency Converter
    微位移——频率转换器的改进
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    Frequency-Fitting-and-Padé Order Reduction ——a Simplified System Reduction Method with Adequate Accuracy and Flexibility
    频率拟合-Padé联合降阶种——一种兼具精度、灵活性和简易性的系统简化方法
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    Twinfrequency Method for Multiple-Fault Diagnosis in Analog Circuits
    模拟电路多重故障诊断的双频率
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    A FREQUENCY-BASED PROGRAM FOR CONTROL SYSTEM DESIGN
    一种基于频率法的控制系统设计程序
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  frequency
Frequency-Domain Bounds for Nonnegative, Unsharply Band-Limited Functions
      
In this paper we give a further investigation of the method introduced by the author in [1, Frequency-domain bounds for nonnegative unsharply band-limited functions] for proving bounds for functions with nonnegative Fourier transforms.
      
We present two-sided singular value estimates for a class of convolution-product operators related to time-frequency localization.
      
This paper presents an expansion for radial tempered distributions on ${\bf R}^n$ in terms of smooth, radial analyzing and synthesizing functions with space-frequency localization properties similar to standard wavelets.
      
The Balian-Low theorem (BLT) is a key result in time-frequency analysis, originally stated by Balian and, independently, by Low, as: If a Gabor system $\{e^{2\pi imbt} \, g(t-na)\}_{m,n \in \mbox{\bf Z}}$
      
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This paper describes a method of measuring the small frequency shift of a resonant cavity, as a perturbation is introduced in it. This is an important problem on the measurement of R/Q of a cavity or the interaction impedance of a slow wave Structure. The method is based on the principle of automatic frequency tunning, i.e. tunning a reflex klystron oscillator tracking the resonant frequency of the cavity to be measured automatically by means of a discriminator. The oscillation frequency of this system and...

This paper describes a method of measuring the small frequency shift of a resonant cavity, as a perturbation is introduced in it. This is an important problem on the measurement of R/Q of a cavity or the interaction impedance of a slow wave Structure. The method is based on the principle of automatic frequency tunning, i.e. tunning a reflex klystron oscillator tracking the resonant frequency of the cavity to be measured automatically by means of a discriminator. The oscillation frequency of this system and the frequency shift after introducing the perturbation are then measured by a heterodyne frequency meter. Analysis and exprimental result show that, by this method, the minimum discriminating frequency shift is 10-5-5× 10-6 (relative value) in S-band, as the Q0.of the cavity is 500-1000.. The tracking error is about 2%.

本文叙述了一种当谐振系统中引入摄动以后,量测其谐振频率微小偏移的方法。这 是量测空腔谐振器和慢波系统耦合阻抗时所遇到的主要问题。 所用的方法基于自动频率微调的原理,即利用一套鉴频系统使反射速调管的振荡频 率自动地跟踪到被测腔的谐振频率。然后利用一高精度外差式频率计来测定该振荡系统 的振荡频率和经摄动后的频率偏移 计算和实验表明,用本文所述方法,当被测腔固有品质数为500~1000时,在S 波段可以分辨的最小频偏相对值达10-5~5×10-6跟踪误差约为2%。

1. An X-band E. S. R. spectrometer has been constructed. Its sensitivity is such that 3×10~(-8) mole of DPPH can be detected by oscilloscope with S/N=15/1. The five byperfine structure lines of 5×10~(-4) M/1 DPPH benzene solution have been resolved.

1.制成波长为3.2厘米的低頻和高頻双重調場的波譜仪;示波器的灵敏度为3×10~(-9)克分子DPPH,其分辨本領約为1高斯。 2.微波系統用反射式和传輸式相結合的装置,反射系統用于晶体視頻接收和調諧监。视,传输系統用于接收高頻信号和頻率自动稳定信号,能方便調整仪器至工作状态。 3.利用单线圈伸入H_(011)型圓柱形共振腔的方法,只需低功率的高頻調場,并能避免高功率高頻調場的干扰。

This paper describes an instrument for the free field reciprocity calibration of hydrophones in ordinary ater tank by pulse technique. The instrument measures the amplitude of the pulse by comparing it with a d. c. Voltage. It uses a differential amplifier to minimize the error caused by the size of the light spot on the oscilloscope, therefore it has higher accuracy. Several acoustical experiments performed with this instrument, and the direc nonal characteristics obtained, the demonstration of the validity...

This paper describes an instrument for the free field reciprocity calibration of hydrophones in ordinary ater tank by pulse technique. The instrument measures the amplitude of the pulse by comparing it with a d. c. Voltage. It uses a differential amplifier to minimize the error caused by the size of the light spot on the oscilloscope, therefore it has higher accuracy. Several acoustical experiments performed with this instrument, and the direc nonal characteristics obtained, the demonstration of the validity of the reciprocity relation and the frequecy responses of some hydrophones are also presented in this paper.

本文介绍了用在普通水池中进行水听器自由场脉冲互易校准的仪器,该仪器用直流 比较法测量脉冲幅度,并用分差放大器减小示波器光点的误差,因此有较高精度。 文中还介绍了用该仪器进行的声学实验,给出了几种水听器的方向特性,互易关系 正确性的验证以及频率响应。

 
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