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频率传输     
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  frequency transmitting
     This system is called MBS (Electro-Magnetic Induction Blasting System), which is based on Faraday Electro-Magnetic Induction Principle together with the frequency transmitting feature of the soft Mn-Zn ferrite as shown in Fig.
     该系统的基础理论是法拉第电磁感应原理,并结合利用软磁锰锌铁氧体频率传输特性的原理。
短句来源
  frequency transfer
     The curves of the ar-rary beampattern and frequency transfer characteristic are given
     给出方向误差与阵列增益关系的计算数据,并作出了阵列波束图和频率传输特性曲线。
短句来源
     Method Modulation transfer function (MTF) was used to analyze the spatial frequency transfer characteristics of CT and MRI.
     调制传输函数可对线性影像系统的频率传输特性进行描述。
短句来源
  frequency propagation
     Modulation instability of single frequency propagation regime in nonlinear high birefingent step-wise decreasing fiber
     非线性高双折射阶跃光纤中单一频率传输区域调制不稳定性
短句来源
     Modulation Instability of Single Frequency Propagation Regime in Strong Birefringence Fibers
     强双折射光纤中单一频率传输区域的调制不稳定性
短句来源
     Modulation instability of near frequency propagation regime in polarization-maintaining fibers
     保偏光纤中相近频率传输区域的调制不稳定性
短句来源
     Modulation Instability of Near Frequency Propagation Regime in Step-wise Decreasing Fibers
     阶跃光纤中相近频率传输区域的调制不稳定性
短句来源
  frequency transmission
     The plane wave transmission properties of a Y slotted array backed with multilayer dielectric are studied in this paper. The mode matching techniques for solving the frequencyresponse of this kind of FSS structure is introduced, and the influence of dielectric thickness on theresonance frequency, transmission loss, as well as the.
     本文简要介绍应用模匹配方法分析带有多层介质衬底的FSS频率响应技术,在此基础上研究带有多层介质衬底的平面Y形缝隙周期阵列对平面波的频率传输特性。
短句来源
     Frequency transmission curves are given, and the existence of a bandgap is proved.
     给出了频率传输特性曲线 ,验证了此种结构频率禁带的存在。
短句来源
     In addition,the stop-band rejection can be further increased by using elliptic filter function which has limited frequency transmission zeros.
     另外,在函数类型上使用椭圆函数型,使带外出现有限频率传输零点,进一步提高了带外抑制能力。
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      frequency transmitting
    Technical data of wireless baby monitors Frequency Transmitting power Range 27.8 MHz 100 mW approx.
          
      frequency transfer
    An analysis is made of the influence of defects on the averaged Green's function of optical phonons whose imaginary part is proportional to the cross section for Raman one-phonon light scattering, which depends on the frequency transfer.
          
    The differences from independent time-transfer techniques such as TWSTFT (two-way satellite time and frequency transfer) are a few nanoseconds for both products.
          
    Furthermore, high-frequency transfer of plasmid RP4 fromC.
          
    Frequency transfer properties of three distinct types of cat horizontal cells
          
    Frequency transfer functions are presented for the three types of H-units and a phenomenological model is discussed that describes these results quantitatively.
          
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      frequency propagation
    On the possibility of soliton-like double-frequency propagation of femtosecond pulses in an optical fiber under conditions of se
          
    A soliton-like mode of double-frequency propagation of femtosecond pulses during second harmonic generation (SHG) in optical fibers is predicted on the basis of computer simulation.
          
    Effect of time scale synchronization on the accuracy of very-low frequency propagation phase velocity measurement
          
    Low-Frequency Propagation of Plane Scalar Waves through a Periodic Array of Arbitrary Volumetric Obstacles
          
    Modeling High Frequency Propagation in Tunnel Environments by Iterative Physical Optics Method
          
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      frequency transmission
    The filter lowest-frequency transmission band arises from the effect of a Fabry-Perot interference filter at the resonance frequency of the temperature plateau.
          
    The next (in frequency) transmission band appears at the cutoff frequency.
          
    The higher-frequency transmission bands result from the antireflection of the atmosphere, an effect well-known in optics and acoustics.
          
    Low frequency transmission of a plastid-encoded trait in Setaria italica
          
    Electron transport properties of single crystal and polycrystalline natural mineral galena (PbS) samples from the Trep?a mine, Yugoslavia, were determined using the photoacoustic frequency transmission technique.
          
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    By investigating the cascade synthesis of lossless Single-end loaded network, this paper proposes the idea that synthesis can be realized for arbitrary real-frequency trasfer zeros by unrestrictedly using a ladder network without mutual inductance, and it also supplies a strict verification.Combining this method with the method which Lin Zaixu proposed in Document (1), the author gives a computer program for realizing transfer zeroes in all complex planes.

    本文通过对单端接载情况下无损网络的链联综合的研究,提出了对于任意实频率传输零点来说,可以不受限制地用无互感、梯形网络来实现综合,并给出了严密的证明;同时,上述方法与文献[1]中的方法相结合,从而作出了用计算机实现整个复平面传输零点的程序设计.

    Based on the basic epuations of transmission lines,the relationship among the equivalent value,the working frequency and the connecting cable's length of capacitive transducer is drawn.And the effect of the last two on the relative sensitivity and linearity of the former is pointed out.Then,the principle of determining the woking frequency of capacitive trans- ducer and the length of its connecting cable is advanced.

    本文从传输线的基本方程出发,导出了电容式传感器等效电容、激励源频率、传输电缆线长度三者之间的关系,并指出了后二者对前者的相对灵敏度和线性度的影响,从而提出了激励源频率和传输电缆线长度的选择原则。

    Propagation of elastic waves along a borehole excited by acoustic multipole sources in soft formation was studied by using "real axis integration" and "branch cut integration". The full wave trains, the pure P and S waves and their excitation spactra have been given. Results obtained with the two numerical methods were compared with each other. It has been shown that: Pure P and S waves are undi-spersed and attenuated, and possess characteristic propagating frequencies respectively, except for the 5 wave under...

    Propagation of elastic waves along a borehole excited by acoustic multipole sources in soft formation was studied by using "real axis integration" and "branch cut integration". The full wave trains, the pure P and S waves and their excitation spactra have been given. Results obtained with the two numerical methods were compared with each other. It has been shown that: Pure P and S waves are undi-spersed and attenuated, and possess characteristic propagating frequencies respectively, except for the 5 wave under the conditions of the P waves have a series of discrete characteristic frequencies, while the S waves have only one; the minimum of such frequencies of P waves is larger than that of S waves; when the pole number n increases, the two kinds of characteristic frequencies will become higher, and the difference between them will also become larger. Therefore, if the center frequency of acoustic sources is in the vicinity of S wave characteristic frequencies and far away from the P wave characteristic frequencies, the multipole sources with lower excitation frequencies can efficiently suppress P waves and excite strong S waves. The numerical results have also shown that the so called shear wave trains in general shear wave logs are composed of pure S waves and asymmetric modes at cut off frequencies, and their contributions to the full wave trains depond on the center frequencies of multipole sources and their frequency bands.

    利用全波场和分波场算法对裸眼井软地层中由单极子源和多极子源(偶极子源和四极子源)激发的弹性波进行了数值研究,给出了声波全波列理论波形、纯纵波和纯横渡理论波形及纵横波的频率传输特性曲线.结果表明,纯纵波和纯横波是无频散几何衰减波;除了在v_s>(1-ρ_1/ρ_2)~(1/2)v_1的井眼中由单极子源激发的横波无传播特征频率外,纵横波都具有各自的传播特征频率,纵波的传播特征频率有一系列离散值,横波的传播特征频率只有一个且等于非对称模式波的截止频率;多极子源激发的纵波传播特征频率的最小值大于横波的传播特征频率,随着极子数增多,二者的特征频率值皆增高,差别也越大,因此,当声源发射主频较低,接近横波传播特征频率而远离纵波传播特征频率时,低频多极子源将压制纵波并激发出较强的横波,分析结果还表明,通常所说的低频多极子源激发出的横波波群实际上是纯横波与截止频率附近的非对称模式波叠加的结果,在其它条件不变时,二老对横波波群相对贡献的大小取决于声源激发主频的高低及其带宽的大小.

     
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