振荡的

Climatologically , 30-60 LFO is more apparent in South China while 10-20 LFO is dominant in North China.

8从气候平均的角度分析，中国夏季降水的低频振荡在南方以30一60天振荡比较明显，尤其是长江中下游地区，而北方以10一20天振荡为主。

During the PDO warm phase, however, there is a significant tropospheric biennial oscillation for the coupled interannual oscillations over these regions In addition , it seems to have a stronger correlation with the SST of the tropical eastern Pacific summer.

结果表明PDO冷暖位相中夏季江淮地区降水量与太平洋海温年际耦合振荡周期和强度均存在显著差异PDO冷位相中，夏季江淮地区降水与前期冬季西南太平洋和同期夏季黑潮区海温在7~8a时间尺度上的耦合最显著，而在PDO暖位相中，与这些地区海温呈现极显著的准2a耦合振荡，并且与同期夏季赤道东太平洋地区海温的准2a耦合振荡也迅速加强。

Thus, two kinds of intensity oscillations with phase difference of 180°can take place corresponding to the specular elastic diffraction and diffuse scattering.

因此在不同的观测条件下可出现二种相位差180°的强度振荡情形：镜向弹性衍射束强度振荡和漫散射束强度振荡。

At first, based on the results of the field tests and studies, this paper indicates that there are two kinds of low frequency power oscillations on the weak tie line: one is caused by negative damping, and belongs to the free oscillation; the other is caused by periodic load disturbances and periodic adjustments, and belongs to the forced oscillation.

首先，本文根据现场试验和研究结果指出，互联系统的弱联络线上存在两类性质不同的低频功率振荡：一类是由负阻尼引起的，属于自由振荡；另一类是由于系统周期性负荷扰动或振荡调节等引起的，属于强迫振荡。

The oscillating frequency and oscillating condition of RC phase shift oscillating can be worked out easily.

则RC 移相式振荡电路的振荡频率及振荡条件可以容易地求出。

The article analyses angle distribution of radiant energy flow density and angle distribution of radiant power when an electric dipole is oscillating along polar axis in magnetic anisotropic medium,also compares them with the expression of that in isotropic medium;thereby,a theoretical basis for more effectly using electric isotropic and magnetic anisotropic medium is obtained.

分析振荡电偶极子在各向异性磁媒质中沿极轴振荡时其辐射能流密度的角分布和辐射功率的角分布情况，并与各向同性媒质中振荡电偶极子沿极轴振荡时辐射能流密度的角分布和辐射功率的角分布情况进行对比，得出更有效地利用电各向同性磁各向异性媒质的理论依据。y

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。

Resultantly, the individual warm/cold events in ENSO cycle appear to be partially locked to the annual cycle, and also exhibit obvious irregularity both in amplitude and in lasting time.

本文第四章研制设计了一包含海洋表面边界层和大气辐合反馈过程的热带太平洋海气耦合异常模式，进而利用该模式对ENSO循环进行了较为真实的模拟，通过对模式ENSO循环的演变特征及其形成机制的细致分析，建立了-ENSO循环的非线性分析模式，并提出了ENSO循环形成的一种更为客观的理论，指出：1）和观测事实类似，模式ENSO循环确实涉及了三种主要时间尺度过程即LF、QB和AC，其中LF为3-4年主周期振荡，QB占总方差10～20%；2）ENSO循环的正反馈机制是不稳定海气相互作用过程，且这一不稳定过程的发展在暖态中明显强于冷态；3）ENSO循环的负反馈机制在冷暖态中表现不同，在冷态消亡过程中，这种负反馈过程主要表现为西边界反射产生的时滞效应，但在暖态消亡过程中不存在类似的时滞效应，其负反馈过程主要表现为在海气耦合不稳定充分发展时伴随的赤道两侧冷水上翻过程的加强以及非线性过程的衰减作用抑制了不稳定的发展并最终使得系统回复至冷态；4）ENSO循环的3-4年主周期振荡是一非线性系统的自激振荡现象，其形成是线性系统的本征模即准两年振荡通过非线性机制产生的周期加倍所致，其中&单向性&大气辐合反馈加热过程对其形成至关重要；5）虽然年循环过程对ENSO循环形成没有本质影响，但它可明显影响ENSO循环的具体振幅和位相，使得ENSO对季节循环有明显的&锁相&特征，并且也使得ENSO循环在振幅大小和时间长短方面呈现出明显的不规则性。

Both of the principles and their algorithms are tested by digital simulating tests. Finally, in order to simulatively test the protective property of microcomputerbased relay protections, a new power swing digital model is established using the calculation of BPAEMTP. New principles have been put forward in this process to solve two problems: One is to set up a new voltage simulating and control module for a multi-machine system in TACS of BPAEMTP.

应用系统振荡模型可以准确地模拟多机系统的任意实际振荡过程；应用BPAEMTP的振荡中故障模型可以计算任意网络、任意系统振荡过程中的任意故障（任意时刻、任意位置、任意故障类型），还很好地解决了初始稳态问题，此外模型可以计算任意长的数据窗。

The oscillation performance of jet, as oscillation frequency, is the essential data for designing the fluidic device, which is also the key factor that influence the coupling effect of fluidic device and receiving tube. This paper does experiment on the oscillation availability and frequency of feedback jet-oscillation gas wave refrigeration. As a conclusion, the jet oscillates only in a certain range of geometrical sizes and operating conditions. Under the condition of high pressure ratio, the frequency of the jet"s oscillation is only affected by the feedback tube"s length and chamber remarkably. Under the condition of low pressure ratio, the frequency descends with rise of the pressure ratio.

本文将跨音速正反馈射流振荡器与接受管耦合，对耦合后的射流振荡气波制冷机的可振性、振荡频率以及它们的影响因素作了实验研究，得出如下结论：射流只在一定的操作条件和几何结构尺寸范围内才能稳定振荡；射流的振荡频率在较高压比下只受反馈管长和反馈管容腔大小的显著影响，在小压比下随压比的增大而增加；其它结构尺寸和操作条件只影响可振性。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。