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频率     
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  frequency
    Study on Frequency Resolved Optical Gating and LD-pumped Frequency-doubled Cr:LiSAF Laser
    频率分辨光学快门的理论研究和LD泵浦Cr:LiSAF蓝光激光器的研究
短句来源
    Design of a CMOS Monolithic Σ-Δ Fractional Frequency Synthesizer
    CMOS单片集成的Σ-Δ小数频率合成器设计
短句来源
    FREQUENCY STABILITY OF TRANSISTOR FEEDBACK OSCILLATORS
    晶体管反馈振荡器的频率稳定
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    Short-Term Frequency Sta-bility of the Rb~(87)Maser
    铷87脉泽的短期频率稳定度
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    A Portable 1100MHz Frequency Counter
    一种便携的1100MHz频率计数器
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更多       
  a frequency
    The Software Design of a Frequency Response Analyzer
    频率响应分析仪的软件设计
短句来源
    A Frequency Standard of S and X Band
    S和X波段频率标准
短句来源
    Design and Implementation of a Frequency Synthesixer for GSM Handset
    一种GSM手机频率合成器的设计与实现
短句来源
    A Frequency Multiplier with Regular Frequency Square Wave Output
    固定频率方波的一种倍频器
短句来源
    High power microwave is generated from the device with an average output power of 2 GW,a frequency of 3.51 GHz and an efficiency of 10%.
    当外加电压为430 kV、束流46 kA时,饱和后输出微波平均功率2 GW,频率3.51 GHz,功率转换效率10%。
短句来源
更多       
  freq
    Designing a Pulse-swallow PLL Freq. Synthesizer by using MC145152-2
    利用MC145152-2设计吞脉冲锁相频率合成器
短句来源
    The circuit is designed to have an input voltage ra nge between 0 to 10 V and an output freq u ency range between 0 to 1 MHz.
    设计的电路输入电压范围为 0~ 1 0 V,输出频率为 0~ 1 MHz,在满刻度为 1 MHz下 ,其非线性度小于 0 .5%。
短句来源
    This devices will have a power output of about 1.0~10GW, the freq uency of microwave f=1.6~12GHz if changing the parameter of the devices.
    微波频率可以设计为 f =1 .6~ 1 2 GHz,功率 Pout可达 GW。
短句来源
    Then I introduced the principle of Pulse-swallow Programmable divider. In the end, I deduced the method to to design a kind of Pulse-swallow PLL Freq. Synthesizer with MC145152-2 and MC12017.
    本文首先介绍专用集成锁相频率合成器芯片MC145152-2的结构特点和应用原理,然后介绍吞脉冲程序分频器原理,最后详细讨论用MC145152-2和MC12017构成吞脉冲锁相频率合成器电路的设计方法。
短句来源
    A method for measuring freq uency performances of IR detectors by using wave analyser and microcomputer is described. Using a frequency scanning device and a GaAs LED as a modulated source, the noise frequency spectrum N(f), frequency spectra of responsivity R(f) and detectivity D~*(f) for IR detectors are fast measured over the frequency range 3Hz~200kHz.
    讨论了使用频谱仪和微机系统测量红外探测器频谱特性的方法,采用频谱仪的扫频装置和大功率GaAs发光二极管作为调制光源,快速测量了红外探测器的噪声谱频N(f),响应率频谱R(f)和探测率频谱D~*(f)。 复盖频率范围为3Hz~200kHz。
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  “频率”译为未确定词的双语例句
    Study on Some Key Technology of High Average Power High Repetition Rate Tea CO_2 Lasers
    高平均功率高重复频率TEA CO_2激光器系统关键技术研究
短句来源
    FREQUENCY-SAMPLING STRUCTURE OF WIDEBAND DIGITAL FILTER
    宽带数字滤波器的频率取样结构
短句来源
    FREQUENCY-NEGATIVE RESISTANCE EFFECT AND COMBINATION OSCILLATOR
    频率—负阻效应与复合振荡器
短句来源
    New Method and Its Computer-Aided Design for Realizing Arbitrary Real-Frequency Transfer Zeros with Ladder Network
    用梯形网络实现任意实频率传输零点的一种新方法及机助设计
短句来源
    A HIGH REPETITION-RATE HIGH VOLTAGE PULSEGENERATOR
    高重复频率高压脉冲发生器
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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 $\{e^{2\pi imbt} \, g(t-na)\}_{m,n \in \mbox{\bf Z}}$
      
更多          
  a frequency
Moreover, this article contains several results that can be employed in order to decide whether a Toeplitz operator with a frequency modulated semi-almost periodic symbol is Fredholm.
      
The presence of a frequency-dependent alternating current susceptibility signal indicates that the individual molecule is acting as magnet.
      
By rotating the loop around the horizontal axis, the gravity-induced phase shift can be detected as a frequency shift.
      
A Frequency Condition for the Generalized Recurrent Difference in the Synthesis of H∞-Suboptimal, Decentralized, and Robust Regu
      
This test is expressed as a frequency inequality, which is verified by verifying whether a polynomial has a real positive root of odd multiplicity.
      
更多          
  freq
Specific features of the frequency dependence of the horizontal magnetic field components in the ultralow and extremely low freq
      
It was possible to predict dimensionless mixing time (θm) using an equivalent Froude number (Freq).
      
The effects of high doses of oxprenolol and of propranolol on pursuit rotor performance, reaction time and critical flicker freq
      
Microhomologies between T-DNA ends and target sites often occur in inverted orientation and may be responsible for the high freq
      
Raman spectroscopy of carbon nitride films deposited using the filtered cathodic vacuum-arc technique combined with a radio-freq
      
更多          


Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper. The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary carrier wave amplifier have been considered more in details. The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation other...

Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper. The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary carrier wave amplifier have been considered more in details. The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation other than by differential equations.

本文結合一个典型线路对带有机械振子的自动稳零直流放大器的低頻特性,进行了分析,并且着重分析了調制解調輔助放大器对緩变信号的频率响应。所用方法是差分方程求解法,因为用差分方程来描述具有机械振子的調制解調线路的固有工作过程,要比用相同的初始条件的微分方程来描述更为准确。文中推导出調制及解調綫路的調制系数k_M、解調系数k_(ДM)以及它們的传递函数。此外,对放大調制波的阻容耦合放大器也进行了分析。分析結果說明,如果放大器耦合迴路的参数选择得合理吋,則此放大器对緩变信号的調制波可作为理想放大器来处理。文中所得結果可作为設計該类型放大器时选择参数的参考。此外,本文对于采用自动稳零直流放大器作运算放大器时可能产生的持續低頻自激振蕩問題,也进行了討論。

In reactance-tube frequency modulation circuits, the fractional frequency deviation is expected to vary with the phase shift constants of the modulator and the LfICf ratio of the tank-circuit of the oscillator. The way in which the frequency deviation is affected by these factors is discussed theoretically. Experimental checks are made, Two types of circuits are studied, the inductive and the capacitive reactance-tube circuits. It is found that within the straight portion, of the operating characteristic of...

In reactance-tube frequency modulation circuits, the fractional frequency deviation is expected to vary with the phase shift constants of the modulator and the LfICf ratio of the tank-circuit of the oscillator. The way in which the frequency deviation is affected by these factors is discussed theoretically. Experimental checks are made, Two types of circuits are studied, the inductive and the capacitive reactance-tube circuits. It is found that within the straight portion, of the operating characteristic of the tube, the agreement is fairly satisfactory.

在电抗管调频电路中,频偏与载波频率之比值,乃随调频器之诸变相常数,及振荡电路中Lf/Cf之比率而变更。本文即就两种基本调频电路,作理论之推引,得出两个基本方程式,表明其间之关系,并佐以实验之证明。

~~

在电力线路上使用的载波频带中,除带滤波器式宽频带阻波器中电感的分布电容必须加以考虑,在设计时,L_1的分布电容可以并入并联的电容C_1中,而表示L_2的分布电容的自然谐振频率f0成为设计参数之一。为了保证在给定截止频率f2′和f_1′范围内输入阻抗大于KR,采用了和f2′与f1′稍有差别的设计用的截止频率f2和f1,按照f2和f1进行设计,就可使在f2′和f1′时的输入阻抗电阻部分等于R。f2—f1比f2′—f1大些。这两个频率可以从给定的f2′、f1′、f0′和电感电容的功率因数中求出。f0一般可以采用在1.5f2′和2f2′间的数值为宜,大于2f2′的f0会使扼阻频带中的颠值阻抗降抵,小于1.5f2′f的f0会使扼阻频带外的输入阻抗降低得太快。末端电阻KR中的K以采用1和0.95间的数值为宜,如果K小于0.95,扼阻频率带中的最低阻抗KR变得太小;如果K大于1,在给定的f2′—f1′情况下所需频宽f2 f1变得大些,这就提高强流线圈的电感L_1,使所需采用的有色金属多些。

 
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