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频率     
相关语句
  frequency
    Study and Application of W-band Frequency Source Technology
    W波段频率源技术研究与应用
短句来源
    Methods of Signal Frequency Measurement and Implementation Based on Nonuniform Sampling
    基于非均匀采样的信号频率检测方法及其实现
短句来源
    A METHOD OF FREQUENCY STABILITY MEASUREMENT WITHOUT FREQUENCY STANDARD
    在没有标准频率信号源的情况下测量振荡器频率稳定度的一种方法
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    128-Spots Phase-Locked Loop Frequency Synthesizer for Acousto-Optic Deflection
    激光扫描128点锁相频率合成器
短句来源
    An Automatic Microwave Frequency Counter
    自动微波频率计数器
短句来源
更多       
  frequencies
    Resonant Frequencies of a TEM+TM_(01σ) mode Dielectric Resonator at UHF Band.
    UHF段TEM+TM_(01δ)模介质谐振器的谐振频率
短句来源
    NATURAL FREQUENCIES OF A MODEL MISSILE
    模型导弹的自然频率计算
短句来源
    COMPUTATION OF HIGHER-ORDER MODE CUT-OFF FREQUENCIES IN TEM CELLS USING BOUNDARY-ELEMENT METHOD
    应用边界元法计算TEM小室中高次模的截止频率
短句来源
    ESTIMATION OF FREQUENCIES OF SINUSOIDS IN NOISE WITH COLORED SPECTRUM-OVERDETERMINED EXTENDED-ORDER HANKEL MATRIX SVD
    未知有色噪声背景中正弦信号的频率估计——超定扩阶Hankel阵SVD
短句来源
    Joint Estimation of Frequencies and DOAs for frequency Agile Signals
    频率捷变信号的频率/方向联合估计
短句来源
更多       
  frequence
    A New Model System with Multiple Source Signal Classification on AOA and Frequence
    新体制多目标信号AOA与频率分选系统
短句来源
    When TD-SCDMA use as macro cover ,to avoid the Interference to WCDMA,the protection band of the frequence DL of TD-SCDMA and WCDMA should be 5MHZ,so TD-SCDMA shoud disposit from #4 frequence,#1、#2 and #3 frequence should not disposit to macro ;
    当TD-SCDMA技术用于宏蜂窝覆盖时,为避免对WCDMA系统造成干扰,TD-SCDMA和WCDMA频率的低端应有5MHZ的保护带,即TD-SCDMA系统应从#4频率指配,而#1、#2和#3号频率不指配给宏蜂窝使用;
短句来源
    If TD-SCMDA use as micro and pico,to insure TD-SCMDA and WCMDA could work well, having themin interference ,#1and #3’frequence should not disposit to TD-SCDMA,that is the two system should have 1.7MHz protective band .
    TD-SCMDA系统如果用于微蜂窝及微微蜂窝时,为了更好地保证TD-SCMDA 和WCMDA两系统在同一区域正常工作,使它们之间的干扰最小,#1频率和#3’频率不指配给TD-SCDMA系统使用,也就是说两系统之间应有1.7MHZ的保护带。
短句来源
    Intensity and frequence of ccl_4 are all influenced notably by solventeffect.
    溶剂效应对CCl_4的强度和频率都会产生比较显著的影响。
短句来源
    This paper introduce a design of the S band wireless RF receiver. which work at frequence 2.0GHz to 2.5GHz.
    本文主要介绍一种工作在S波段频率为2GHz~2.5 GHz的无线通信射频接收前端的设计。
短句来源
更多       
  frequency rate
    This paper performs the passive range-finding location technology by use of angle,angle rate of change and Doppler frequency rate of change into shipborne electronic warfare system,that makes the system can realize single station location to the motive targets with high speed,introduces the principle of the location technology and the implementary methods of high precision parameters measurement.
    将一种运用角度、角度变化率和多普勒频率变化率参数实现无源测距的定位技术引入舰载电子战系统使其具有对高速运动目标的单站定位能力,介绍了定位技术的原理以及参数高精度测量的实施办法。
短句来源
    A New Method of Estimating the Doppler Frequency Rate of Spaceborne SAR
    一种新的星载SAR多普勒调频率的估计方法
短句来源
    Accuracy of Estimation of Doppler Frequency Rate for Spaceborne SAR
    星载合成孔径雷达多普勒调频率估计精度分析
短句来源
    Estimation of Instantaneous Frequency Rate for Multicomponent Polynominal Phase signals
    多分量多项式相位信号瞬时频率变化率的估计
短句来源
    Bistatic SAR Doppler Frequency Rate Estimation Based on Radon-Wigner Transform
    基于Radon-Wigner变换的双基地SAR多普勒调频率估计
短句来源
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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          
      frequencies
    They are potential tools for the decomposition and handling of signals that, like speech or music, seem over short intervals to have well-defined frequencies that, however, change with time.
          
    We prove a trigonometric inequality of Ingham's type for nonharmonic Fourier series when the gap condition between frequencies does not hold any more.
          
    We provide an almost sure convergent expansion of fractional Brownian motion in wavelets which decorrelates the high frequencies.
          
    The MC1595 was utilized to compose a phase detector in which difference of phases varies with the change of frequencies.
          
    The model built in this way describes the stable point scattering mechanisms in a large spatial extent and can be extrapolated to other frequencies in the optical region.
          
    更多          
      frequence
    The results show that 10 μmol/L Lacidipine can reduce the frequence which 10 μmol/L 5-HT induced [Ca2+] spark in SFSMC of calcium over loading to 50%, and amplitude to 50% or so.
          
    The program simulation facilities, such as time-domain analysis, frequence-domain analysis, sensitivity analysis and multiple objective optimization are described.
          
    La frequence de mue decline avec la taille, de facon prononcee chez les femelles de plus de 6 ans.
          
    Cet Isopode a ete recolte sur la totalite de l'aire prospectee mais avec une frequence peu elevee: 91% des prelevements contenaient 1 a 5 specimens et un total de 140 individus ont ete recoltes.
          
    Il est postule que cette specialisation trophique pourrait expliquer certaines caracteristiques inhabituelles tels la presence d'une seule femelle adulte de Zalophora par diplopode, la faible frequence des juveniles et l'apparente absence des males.
          
    更多          
      frequency rate
    Using an operational case-definition based on three interrelated clinical criteria, a frequency rate for all forms of psychiatric disorder of 24.0% was obtained.
          
    This study describes the effects of chlorpromazine, promethazine, perphenazine and trifluoperazine at each of four dose levels on the discrimination of the frequency rate or at several different standard auditory pulse rates.
          
    The three drugs dose-dependently depressed VTA self-stimulation in a similar way, with low doses inducing a fairly parallel rightward shift of the frequency/rate curves and higher doses flattening the curves.
          
    In the Kingdom of Saudi Arabia (KSA), hospital and population based statistics have shown that breast cancer has the highest crude frequency rate among Saudi women.
          
    On the 1 evening-night shift the unjustified absence frequency rate was higher than on 3 fixed shifts and fortnightly rotating shifts.
          
    更多          


    With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies...

    With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies as high as several hundred me using conventional vacuum tubes. Unlike conventional circuits, distributed amplifiers have an attainable gain-bandwidth product which is not limited by shunt capacitance associated with the vacuum tubes and circuit wiring; the high-frequency limit being determined entirely by high-frequency effects within the tube proper.The purpose of this paper is to describe the basic principle of distributed amplification and to show how such an amplifier employing various types of transmission lines may be designed. Practical methods hi design and design details are given for a three-stage distributed amplifier, using fourteen 6AK5 pentodes with a frequency response of 0.1 mo to 140 mo and a gain of 33±1 db.Both the negative mutual-inductance m-derived and constant K artificial delay lines hare been used. The former offers the advantage of a more linear phase characteristic and a more uniform response both in amplitude and delay time.The experimental results corroborate the predictions based on the first-order theory described in this paper.

    分布式放大是最近宽频带放大的最大成就,过去多年来电子学所应用的各种宽频带放大方法,其高频部分因受电子管电容和线路的分布电容所限制,不能获得理想的结果,而利用分布式放大的理论,所制成的宽频带放大器,远较一般普通的宽频带放大器,有更为宽阔的频带;从它的设计和构造上来看,也较负反馈的宽频带放大器为简单。制造一架自数千周至数百兆周的分布式放大器,在技术上并没有很大困难。本文拟对分布式放大的原理作扼要的分析;并提出了采用各类型仿真线所构成的分布式放大器的设计方法,并利用该设计方法,试作了一只三级十四管的分布式放大器,其增益为33±<1分贝,频宽自100千周至140兆周。由实验结果证明,采用m导出式低通滤波器所构成的仿真线的分布式放大器,实较用常K式者,具有更佳的相移特性和频率特性,这与理论上的分析是一致的。

    This article introduces a new circuit of wide band square-wave generator, producing square-waves from 15 Hz to 1.2 MHz in seven steps, with rise time, of about 0.04 μs., the highest out put-signal level being13.5 v. peak to peak.Finally, some experimental examples of square-wave application are given.

    本文介绍一个矩形波发生器的新电路,可以产生七种不同频率(由15赫至1.2兆赫)的矩形电压,建立时间约0.04微秒,轮出的最大振幅达13.5伏。后面还提出一些应用矩形电压的实验范例。

    ~~

    鉴于祖国进行大规模地建设并开始自己制造多路载波电话通讯设备,这篇报告及时地提出架空明线十二路载波电话系统的新型设计方法.报告内容包含频率分配和变换程序,传输质量和电平选择,频率交叉法使用问题,压缩扩展器使用问题,以及自动调节电平设备,振铃讯号设备,终端机和增音机设备,线路进站和远距供电设备等各种制度的选择和比较,都提出初步意见,以供讨论.一、应用目的和经济意义二、频率分配和变换程序的讨论三、传输质量和电平选择的讨论四、频率交叉法使用的讨论五、压缩扩展器使用的讨论六、调节电平设备的讨论七、振铃讯号方法的讨论八、终端机和增音机设备的讨论九、线路进站设备的讨论十、远距供电设备的讨论参考交资料

     
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