不稳定性

Based on both the strong-weak model and the strong-strong model, the instability caused by ions in equilibrium is simulated, some useful results are obtained. The results include the relation between instability growth rate and neutralization factor, the relation between instability threshold and neutralization factor, and the incoherent tune shift, the tune spread, the ion cloud distribution, the ion loss mechanism, as well as the ion accumulation limitation in the storage ring. With this understanding, we have carried out theoretical and experimental study for some ion clearing methods and their effects for the HLS ring. The minimum static clearing voltage is determined through calculating beam electric field and measuring ion current.

在上述基础上，我们对各种离子清洗的方法及清洗效果进行了理论和实验的研究：通过计算束流电场和测量清洗电极上的离子流来确定直流清洗电极所需的最小清洗电压；通过测量离子引起的频移来计算储存环的中性化系数；用模拟计算和实验测量证实了高频清洗能有效地克服储存环上离子俘获不稳定性；对由高频剔除系统形成的储存环部分束团填充模式下的离子俘获问题进行了初步研究，证实采用束团部分填充模式能在一定范围内克服离子俘获效应；并对各种离子清洗方法进行了比较。

On the formation mechanism of brown dwarfs astronomers have different opinions, the more common projectile theory, the former star's light caused by erosion of the nuclear theory of opacity constraints of splitting theory, the original star's disk instability theory.

关于褐矮星形成的机制天文学家们众说纷纭，比较常见的有抛射理论、前恒星核的光致侵蚀理论、不透明度制约的分裂理论、原恒星盘的不稳定性理论等。

By considering the finite spread in beam longitudinal momentum and the effect of finite space-charge field of the electron beam,the dispersion relation of IRL instability is derived ,and the growth rate of IRL wave and the linear damping rate of the space-charge wave are also got.

利用动力学理论对一种新型自由电子激光──离子波纹激光进行了研究，考虑电子束的纵向动量离散和空间电荷场效应，导出了IRL不稳定性色散关系，求得了IRL辐射波的增长率及电子束空间电荷波的线性阻尼率，并对其进行了讨论，得到了一些结论。

This same anatomic configuration also allows some movement between the crest and the septum, and it is this instability that explains the frequent posttraumatic findings of a displaced quadrilateral septal cartilage from the groove of the crest.

同时这样的解剖特点，也使得鼻中隔和腭嵴之间有一定的活动度，正是这种结构的不稳定性可以解释为什么在创伤后经常容易发现四边形的鼻中隔从腭嵴凹槽上脱位。

But that same financial system has intrinsic characteristics that can make it self-destructively unstable when it meets a large shock.

但是，同样是这个金融体系，却具有一种内在的特质：在遭遇大型冲击时，它就具有自我解构式的不稳定性。

But ferrate has the property of self-catalysis, unlike the stability of chlorine, which contributes to its low stability in solution and prohibits its wide use.

但是，高铁酸盐有自催化现象，具有不稳定性，不能够象液氯一样长期保存，这大大限制了它的大规模应用。

Propagation and development characteristics of surface instability of the spherical premixed flames for methanol-air-nitrogen mixtures were studied by using a constant volume combustion chamber and high-speed schlieren photography system.

利用高速纹影摄像法在定容燃烧弹内研究了不同燃空当量比、初始压力、初始温度和气体稀释度下甲醇－空气－氮气混合气预混球型火焰的发展特性以及3种火焰锋面的不稳定性。

It's difficult to sidetrack in the deep well in salt bed,especially the creep ing of the gypsum-salt bed,hole diameter reduction and collapsion etc.

在深井盐层中进行侧钻困难较大，膏盐层的蠕动、缩径、垮塌等不稳定性是侧钻的最大障碍。

The thesis mainly studies the potential well effect on the bunch longitudinal distribution, on the basis of correlated wake field, coupling impedance and various instabilities. Then the inductance and resistance parts of coupling impedance of the KEK-ATF damping ring are obtained from the analyses of the measured bunch longitudinal distribution.

本论文在充分阐述与束流集体效应相关的尾场、耦合阻抗和各种不稳定性的基础上，着重研究了势阱效应对束团纵向分布的影响，并由实测的KEK-ATF阻尼环的束团纵向分布得到了其耦合阻抗的电感和电阻部分。

The bunch lengthening is mainly due to potential well distortion and longitudinal microwave instability . From the systematical measurement of the bunch longitudinal distribution, the inductance and resistance parts of coupling impedance of the BEPC storage ring are got.

束长拉伸主要是由于势阱畸变和纵向微波不稳定性，本论文从束团纵向分布的测量中，首次得到BEPC储存环耦合阻抗的电感和电阻部分，并用所得到的耦合阻抗模型对束长拉伸进行验证。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。