不稳定区

单模光学双稳系统的不稳定区整体分布及分岔与混沌

Unstable region and bifurcations and chaos in single-mode bistable optical systems

部分充液悬臂转子在不稳定区的动力特性

Dynamic behaviour of a rotor partially filled with fluid in the unstable region

天琴座RR型变星脉动不稳定区红端边界

On the red edge of the RR Lyrae instability strip

锋区900hPa以下是一个大气弱对流不稳定区，向上气层变为潮湿中性直至400hPa，等θse线基本上呈垂直分布；

The stability conditions of the front zone turn into the moist neutral above 900 hPa from the weak convective unstable under 900 hPa ;

根据海气相互作用强度（αγ）和ε（＝cs／ca。cs，ca分别为海洋和大气中的重力波波速）的大小，可以把不稳定区分成三个部分。

Based on the magnitude of the air-sea coupled strength and ε ( ratio of the ocean gravity wave velocity to the atmosphere one ), the unstable region can be divided into three parts .

同时，低层在40°N附近有明显的东西向锋区配合锋生变形场逼近鲁西北一带的潜在不稳定区，该冷涡会造成山东大范围降雹。

Meanwhile in the low level there is a obvious east west frontal zone around 40 ° N with deformation field of frontogenesis , which approaching to the potential unstability area in northwest of Shandong province , the cold vortex will cause a large area hail shooting .

从Brunt-Vaisala频率N和水平风切变计算的Richardson数Ri剖面也显示出季节差异，Ri<1/4的动力不稳定区出现在夏季，而Ri>0.4的稳定区出现在冬季。

Richardson number Ri calculated from Brunt-Vaisala frequency N and horizontal wind shear S also reveals seasonal difference : dynamically unstable regions of Ri smaller than 1 / 4 are observed in summer , whereas stable regions of Ri larger than 0.4 are observed in winter .

而在南太平洋，不稳定区的面积较小，且主要局限于海盆东侧，因而传播较弱，这样就造成了ENSO信号在太平洋南、北半球的非对称传播。

While in the South Pacific , the area with instability is much smaller and mainly confined in the eastern part , which weakens ENSO signal propagation in the South Pacific . An asymmetric propagation of ENSO-related oceanic anomaly exists between the South Pacific and the North Pacific .

暴雨区上空低层是MPV<0的不稳定区，MPV负中心出现在暴雨中心附近，两者强度的演变近乎一致，并且有MPV1<0、MPV2>0和MPV1>MPV2。

Above the rainfall area there were the instability area of MPV < 0 , and the negative focus of MPV located at the focus of heavy rainfall when MPV1 < 0 , MPV2 > 0 and | MPV1 | > | MPV2 | .

异步电动机不稳定区T～S曲线测量研究

On testing of t ~ s curve in unsteady zone of asynchronous motor

文中列出了计算所得的白云石稳定区和不稳定区的范围。

In this paper , the stable and unstable areas of dolomite are given by thermodynamical calculation .

研究了横摇和垂荡非线性耦合情况下的动力不稳定区问题。

Study on the instability regions of ship rolling with nonlinear coupling of heave and roll was presented .

不稳定区主要是沉积泥岩及煤线，构造相当发育，大都相互贯通，裂隙较多，岩石力学强度低。

The zone of instability are mudstone and seam with large quantity and continuous structures and low strength .

高阶不稳定区因阻尼的存在而迅速上移，它们对立管参激稳定性影响非常小。

Due to damping , high-order instability zones rapidly move up , so they have little importance for riser .

文中将场地分为三类：稳定区、基本稳定区和不稳定区。

Site is classified into three sorts : stable region , stable region in the main and non-stable region .

暴雨落区位于具有强盛的垂直上升运动的高能、高湿舌的不稳定区内。

The heavy rainfall area locates in the instability region with strongly ascending motion , high energy and high humidity .

模式结果显示混沌混合区主要分布于赤道东太平洋不稳定区及东、西边界附近，中西太平洋的大部分区域为非混沌区。

In the model , the main chaotic regions exist in unstable zone and the eastern and western ocean boundary .

211模型具有高效区扬程范围宽、无明显的不稳定区等优点。

The Model 211 has the merits of wide water_head range of high efficiency zone , and has no obvious non_stable performance .

计算结果显示了主向梁数目和载荷参数对动力不稳定区的影响。

The calculation results show the effect of the number of main beams and the load parameters on the dynamic instability region .

层状云降水天气绝大多数为热力稳定型但同时存在位势不稳定区，并存在弱的垂直上升速度。

Most of stratiform cloud precipitation systems are thermal stable types , and exist potential instability regions and weak vertical velocity . 2 .

选择几种模态为例说明材料的压电性、壳体几何参数和加载形式对不稳定区的影响。

Several mode shapes are selected to explain the effects of the piezoelectricity of materials , geometric parameters of shells as well as loading form on instability regions .

基于能量法推导出了加筋板中薄壁骨材承受轴向周期载荷时的侧倾动力不稳定区的求解方法。

The paper based on the energy method derives a method for solving the dynamic tripping buckling problem of thin walled stiffeners in stiffened plate under periodic dynamic loading .

然后，突破参数激励幅值的限值，通过表达式转换得到另一个小参数替换前者，确定任意激励幅值下的稳定区和不稳定区。

Then , to replace small parametric excitation amplitude with another small parameter by equation transformation , the stable and unstable regions under arbitrary excitation amplitude can be determined .

具体表现为其误差大值区通常出现在对流不稳定区，并且随着水平风场向其下游扩散。

The results show that , the development and evolution of initial perturbation errors have a close relationship with the regions of the convective instability and the horizontal wind fields .

结果显示，极不稳定区和不稳定区中包含了86%的校验滑坡，说明评价结果与实际发生的滑坡情况基本吻合。

The result shows that the extremely unstable area and unstable area contain 86 % of the verified landslide , indicating that the evaluation result is in reasonable agreement with the actual landslide .

将庆元县划分为北部稳定区、东部基本稳定区、西北部不稳定区和西南部极不稳定区等四个环境区。

The county was divided into four zonations , as " north stable region ", " east rough stable region ", " north west unstable region " and " south west highly unstable region " .

通过对三个岩体岩石学、矿物学、地球化学的综合研究及相平衡分析认为，形成碱性杂岩体的岩浆来源于斜长石不稳定区（>60km），及石榴石与金红石稳定区（>50km）。

After researches on petrology , mineralogy , geochemistry and phase equilibrium , the three alkaline intrusions came from sources that had no plagioclase ( > 60km ) but had garnet and rutile ( > 50km ) in their melting residue .

研究结果表明：虽然旋转主轴的陀螺的效应不会改变铣削系统的不稳定区，但会明显增加其特征值的实部（达30%），同时对系统的响应频率影响很大。

The results show that although the gyroscopic effect of the rotating spindle does not change the instability regions in milling , it increases the real parts of the eigenvalues of the system or reduces the critical axial depth of cut .

计算结果表明：流速使特征频率下降，当流速达到某一临界值时，存在一个不稳定区，在该区域内两种失稳的可能性都存在；

Numerical results showed that the flow speed made the frequency lower , and there exist an unstable region when the flowing speed reached a critical value , two types instabilities may exist in the area , one is buckling and the other is flutter .

在运动的惯性不稳定区，如果基本气流的涡度随纬度非线性增加，则当初始位置的地转偏差达到某一强度时，运动可发生一种月尖形突变。

In inertial instable region , if the vorticity of basic zonal flow nonlinearly increases with the latitude ( i.e. , 3-u / y3 < 0 ), the motion should generate a cup-shaped catastrophe when the geostrophic departure at initial location enhances to some critical intensity .