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The formation mechanism of the absolute instability and gyrotron backward wave oscillations is analyzed, and the methods to suppress the parasitical modes are discussed.The nonlinear theory model of gyro-TWT is consummated by considering the influence of tapered magnetic field and waveguide radius, electron velocity spread, and waveguide loss on electron beam-wave interaction. The large-signal characteristic of gyro-TWT, such as launching loss and absolute instability, are also analyzed in detail. This work establishes the foundation for the development of a gyro-TWT amplifier.

重点研究了两段损耗波导结构和损耗陶瓷结构回旋行波管中的电子注-波互作用,分析了绝对不稳定性和回旋返波振荡的形成机制和抑制寄生模式的方法;完善了回旋行波管的非线性理论模型,并考虑了磁场和波导半径渐变、速度零散、波导损耗等因素对注-波互作用的影响;详细分析了发射损耗、相位稳定性等回旋行波管的大信号特征,为回旋行波管放大器的研制奠定了基础。

Therefore, the interaction structures with distributed wall losses and attenuating severs were more stability for absolute instability and gyrotron backward oscillations.

藉由引用非线性程式进行磁旋行波放大器稳定分析,结果显示散布式损耗(distributed-losses)的设计对绝对不稳定有明显的抑制作用,而隔离管结构亦具有减短磁旋返波振荡作用长度的效用,因此我们采用兼具隔离管及散布式损耗结构的磁旋行波放大器,同时提升绝对不稳定和磁旋返波振荡的稳定性。

However, operating of the high current, the output power, gain, and efficiency of gyro-TWT will be degraded where the absolute instability, gyrotron backward oscillation and reflective oscillation occur to cause mode competition. Stability issues comprise the key factors limiting the performance of the gyro-TWT, therefore physical origins of spontaneous oscillations in the gyro-TWT are analyzed and characterized.

然而受限於操作高电流,磁旋行波放大器可能引发绝对不稳定性、磁旋返波振荡(gyrotron backward oscillation;gyro-BWO)及反射振荡,造成模式竞争而抑制原先操作模式的放大波,进而影响其输出功率、增益及效率。

The effect of magnetic field on the Rabi oscillations between the coupled chains is also discussed. We find that the uniform magnetic field can strongly affect the dynamic localization and the Rabi oscillations.

磁场对两链之间Rabi振荡的影响也被研究,结果表明磁场可以很强地影响系统的动态局域化以及Rabi振荡。

The results also show that resonance tube heating effects are related to the pressure oscillations in the tubes, whereas the pressure oscillations are related to the pressure of the driving gas, and further, different types of resonance tubes have significantly different heating properties.

实验结果确认了谐振管加热的主要机理是激波振荡累积加热机制,而且表明谐振温升与管内气体压力振荡幅值有关,而谐振管压力振荡幅值与驱动气体压力有关;结构形式不同的谐振管,加热特性显著不同。

To deal with power oscillations on the weak tie line, and to guarantee the operation stability of the interconnected networks, it is important to identify the causes of power oscillations.

搞清产生功率振荡的机理,对于处理联络线功率振荡和保证互联系统的稳定运行是十分重要的。

Feb. 1988, quasi-biennial and quasi-3-to-4-year oscillation are invenstigated. It is found that the two oscillations are propagating from west to east at all levels, being out of paase for the tropics but in phase for the mid-latitudes; for the latter oscillations in West Pacific, it travels equatorially from both mid-latitudes at low-levels while from south to north through a well-defined channel at...

结果发现:纬向风准两年、准3─4年振荡在热带地区上、下层均一致自西向东传播,但位相相反;在中纬度地区,纬向风准两年、准3─4年振荡上、下层均盛行自西向东传播,且位相一致;西太平洋地区低层纬向风准3─4年振荡均为从南、北半球中纬度地区向赤道传播;高层纬向风准3─4年振荡在175─140°W附近存在一明显的通道,且为自南向北传播,而且在经向上呈1波特征。

Topics covered include oscillations, Keplerian orbits, two-body scattering, rotating frames of reference, rotation of rigid bodies in three dimensions, Lagrangian mechanics, Hamiltonian mechanics, and coupled oscillations.

内容包括振荡,开普勒轨道,两体散射,旋转参考坐标系,在三个方面,拉格朗日力学,哈密顿力学刚体转动,和耦合振荡。

In our study, multiple temperature-independent points and accompanying oscillations are observed in the longitudinal resistivity between the low-field insulator and the quantum Hall liquid. The amplitudes of these oscillations can be well described by conventional Shubnikov-de Haas theory, and our experimental results therefore support the existence of an intermediate metallic regime between the low-field insulator and quantum Hall liquid.

在此研究中,我们发现在低场的绝缘态与高场的量子霍耳态之间,纵向电阻率有多个不随温度变化的交点,而此交点所在的位置与其所伴随振荡的振幅可以利用Shubnikov-de Haas 理论解释,因此由我们的实验结果可以看出,在低场绝缘态与高场量子霍耳液体态之间,的确存在一个过渡的金属态。

Numerical calculation shows thatthe oscillations of the effective optical constants play an important rolein the oscillations of magneto-optical Kerr effect.

计算表明光学的振荡是磁光效应振荡的一个重要原因。6.Fe-Ni/Cu磁性多层膜中层间耦合与磁性

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