Accuracy of the measurement system is verified by standard signal sources . frequency tracking error does not reach 50hz . the measurement system has merits of visual display and high accuracy , which is an ideal measurement system for dual - path saw mass sensor 应用标准信号源验证了测量系统的精确性，频率跟踪特性误差在50hz以内。该测量系统显示直观，精度高，是双声路声表面波质量传感器理想的测量系统。
Polyphonic novel was characterized by the following featrures as equality in consciousness between the author and protagonist ; and thinking depicted in dialogue rather than development ; diversified rather than simplified materials ; alliterated narration , soliloquy and dialogue 复调小说的特点在于主人公的意识与作者的意识平起平坐；思想不是从发展的方面而是从对话的方面被描述；材料是多样化的而不是单一的；小说中的叙述语、独白语及对语都具有双声性。
Y type and s type dual - path saw mass sensors have been tested and analysed in detail . their frequency domain characteristics and time domain characteristics have been tested under non - oscillatory mode . transmission characteristics of y type s type and " - " type saw mass sensors are derived by p matrix representation . primary delay signal triple reflection signal and quintuple reflection signal of these sensor devices have been analysed in detail 结果表明，在正常工作模式下， y型和s型双声路声表醚质量传感器件的三次渡越反射信号和五次渡越反射信号比“一”字型双声路声表醚质量传感器件的三次渡越反射信号和五次渡越反射信号分别小12db 、 16 . 67db和n _ . sdb ? 17 . 3db 。
According to the theory of acousto - optic ( ao ) interaction , the formulas of diffraction loss of two ao q - switches , which acousto - field are perpendicular or parallel one another , the power divider for ensuring two ao q - switch synchronization and effective power driving is designed . the calculation results are satisfied with nd : yag laser experimental results . it is show that two ao q - switches , which acousto - field are perpendicular each other , switch - loss is nearly one times larger than one ao q - switch , one of third larger than the two ao q - switches which acousto - field are parallel 从理论上对声光器件衍射损耗作了分析与计算，研究了二维双声光器件对提高衍射损耗效率的影响，在实验中采用二维双声光组合器件提高声光器件的对nd ： yag激光器的关断能力，较之单声光的关断能力提高了一倍左右，而对于平行双声光也提高了30左右，并设计了声光驱动功率分配器以驱动双声光器件达到同步，消除了激光输出的多脉冲现象，提高了脉冲列的输出功率。
Corticofugal modulation of frequency tuning of inferior collicular neurons in big brown bat , eptesicus fuse us chinese science bulletin , 2000 in order to explore the possible mechanism of corticofugal modulation of excitatory frequency tuning curves ( eftcs ) of midbrain neurons , we examine the change of sharpness , frequency - intensity response area , minimum threshold of both eftcs and inhibitory frequency tuning curves ( iftcs ) of inferior coliicular neurons during corticofugal modulation using two - tone inhibition paradigm and micro - electrical stimulation technique 第二章大棕幅听皮层对中脑下丘听神经元频率调谐曲线的调制科学通报， 2000用双声刺激的方法和电刺激技术，进一步研究了在激活听皮层前后下丘听神经元兴奋性和抑制性频率调谐曲线的锐度、频率强度反应区域、最低阈值的协同变化
