| 1. | As a design method , frequency tuning approach ( fta ) was suggested to be used first to avoid critical frequency ranges
建议人行桥梁设计时应首先采用频率调整法，使结构自振频率尽量不落在敏感频率范围内。 |
| 2. | The vibration control has two main types : initiative and passivity . i use the modulation frequency tuned mass damper to control the vibration of it and adopt ansys5 . 5 to calculate the result of it
振动控制主要有主动和被动控制，我是应用被动控制的调制调频质量阻尼器进行桥机的控制。 |
| 3. | In contrast , although application of bicuculline essentially had no effect on the bfs of ic neurons , it differentially broadened neurons ftcs at different azimuths abolishing the direction - dependent sharpening of frequency tuning
本研究还提示，听皮层对下丘神经元频率调谐的方向敏感性的调制，可能是通过改变神经元在不同声源方位的抑制区的大小实现的。 |
| 4. | We also demonstrated that one corticofugai pathway is that auditory cortex sends excitatory inputs to icx and then sends inhibitory inputs to icc from icx . under free field sound stimulation conditions , we studied the sound direction effect on frequency tuning curves of inferior collicular ( ic ) neurons
本研究首次提出了听皮层调制皮层下神经元方向性性信息的概念，并发现，下丘神经元频率调谐的方向敏感性的形成中，听皮层的下行调制有重要作用。 |
| 5. | In the third chapter , a methodologies to realize second - order band - pass filter with which center frequency tuned in a wide range using mcdi ( multiple output current - mode differential integrator ) , these two kinds of mcdi are composed of pmos and nmos input transistors respectively , lastly we compare these two integrators " merits and disadvantages
第三章：提出了输入级分别为pmos管、 nmos管的多输出端电流模式全差分积分器，并由此构成了中心频率连续可调的二阶带通滤波器，同时比较了二者的优缺点。 |
| 6. | These data indicate that gabaergic inhibition makes an important contribution to the direction - dependent frequency tuning of most ic neurons . corticofugal modulation of the excitatory and inhibitory ftcs of most ic neurons was more pronounced at one sound direction than the other . sound direction effects on frequency tuning characteristics may undergo a postnatal development due to the development of excitation and inhibition integration
通过对幼年(出生后第四周)和成年蝙蝠下丘听神经元频率调谐的方向敏感性的比较，发现幼年蝙蝠频率调谐的方向敏感性比成年蝙蝠差，并认为可能是动物发育过程中，下丘的兴奋性和抑制性输入的整合也有一个发育的过程。 |
| 7. | This study showed that the mt and sharpness of frequency tuning curves increased as the sound direction changed from contralateral to ipsilateral azimuthal angles . it suggests that sound direction effect on frequency tuning may be through the complex interplay between the excitatory and inhibitory inputs . the application of gaba ( a ) antagonist , bicuculline , lowered all mts but the application did not abolish direction - dependent variation in mt
听皮层的抑制性影响使大多数神经元在蝙蝠最敏感的声源方位c - 40的频率分辨能力明显提高，同时使c - 40和i - 40的最低阈值的差别进一步增大，提高了信噪比，提高下丘听神经元对声源方位和最佳频率的分辨能力。 |
| 8. | From these results , it is tempting to speculate that the response of ic neurons to sound signal could be inhibited or facilitated by the weak noise . our data revealed for the first time that the weak noise could sharpen frequency tuning and increase the sensitivity of mouse ic neurons to high frequency of sound signal
木实验结果首次显示弱噪声可锐化小鼠大部分ic神经元的ftc ，使神经元对声信号分析增强，高频调谐敏感性增加:而bic去gaba能抑制后，能全部或部分的解除弱噪声对神经元ftc的抑制。 |
| 9. | Were used for this study . durations of tone and weak white noise bursts used as sound stimuli were both 40 ms ( 2 - ms rise - decay times ) , and delivered synchronally at 2 per second in free field . 177 neurons were obtained in this experiment , and frequency tuning curves ( ftcs ) of 76 ic neurons were measured in our study
本实验共用12只健康、听力正常的成年小鼠，雌雄不拘，共获得177个神经元，测量了76个神经元的频率调谐曲线( frequencytuningcurve ， ftc ) ，发现弱噪声对神经元ftc的影响有三种类型：锐化、拓宽和基本不受影响。 |
| 10. | 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 |
