1. The operation of periodic flow reversal is a new kind of unsteady-state reaction techniques.
流向变换周期操作是一种非稳态催化反应新技术，其反应器模型一般为非线性反应－对流－扩散方程的新型定解问题。
2. The diesel engine crank is one of the parts with high technology requirments and high cost. It is easy to be damaged for bearing heavy periodic reversal load.
曲轴是柴油机中技术要求高，造价较昂贵的部件之一，由于其工作中承受较大的周期性的交变载荷，故容易损坏。
3. Preliminary studies indicate that under conditions of rather perfect crystal boundaries and periodic reversal of the direction in rotation, capping would be more effective if the solution bas a higher degree of supersaturation.
另一方面比较详细地研究了晶体在培养器中的取向对ADP晶面生长速率和晶体生长习性的影响，初步确定了维持晶体匀称生长较好的空间取向。
4. The main structure of this paper consists of two parts: theoretical analysis was mainly conducted in the first part, which including chapter 1 and 2, in this part the analysis was focusing on the connotation of liquidity, the supply and demand theory, the measuring methods, as well as micro-and macro-economic effects, and then proposed that the periodic reversal of liquidity was the concrete manifestation of the financial crisis; the second part, including the chapter 4, 5, 6 and 7, which cases analysis were made mainly in this part. Combined with the financial crisis, as well as from the US, developed-new emerging economies and China three different perspectives, it further analyzed the specific performance of liquidity reversal from excess to crunch, transmission processes and responding measures.
第二、三章为理论分析部分，分析了流动性的内涵剖析、供求理论和度量方法，以及流动性的经济效应；第四、五、六章为实例部分，以美国、中国，部分发达国家和新兴经济体在金融危机下流动性特征为案例，层层剖析了流动性变化的具体表现和原因，流动性变化的度量，以及流动性逆转在金融机构、金融市场和实体经济中的扩散，在不同国家间的传导；第七章提出防范流动性逆转危机的具体措施。
5. In the second section, some analyses for large time behavior of the solutions of the models of scalar equation for reactors with periodic flow reversal are given by the maximum norm estimation of parabolic equations.
利用抛物型方程的最大模估计证明了单方程模型当关于单调递减时其对应的循环定态解的存在性，并且当时，模型解会趋于其对应的循环定态解。
6. The existence and uniform boundedness of the global solutions of the model for sulphur dioxide oxidation in a tubular reactor with periodic flow reversal are proved by the invariant domain method.
利用不变区域方法，证明了二氧化硫催化氧化管式反应器流向变换强制操作模型整体解的存在性和一致有界性。
7. If we introduce the aperiodic or periodic reversal of the nonlinear optical coefficient into the waveguides, the CSHG conversion efficiency can be improved greatly, the configuration also has been called quasi-phase matched CSHG. Several research work in this filed has been carried out.
如果引入二阶非线性系数的周期极化反转，即考虑到准相位匹配的情况，切伦科夫倍频效率将会得到极大的提高，可以将之称为准相位切伦科夫倍频。
8. Design consideration and design methods for periodic reversal permanent magnet focusing system are presented, special technical problems met in design of multi-beam electron gun with controlling electrode are discussed.2D computer software or magnetic field and electron trajectory of electron optics system has been established, and applied to calculate the electron optics system of S-band 200 kW multi-beam klystron.
给出了周期反转永磁聚焦系统的设计方法和设计考虑，讨论了控制极调制多注电子枪设计中遇到的特殊问题和解决方法，建立了计算电子光学系统的二维磁场和电子轨迹计算软件，并应用这些软件设计和研制了S波段200kW多注宽带速调管的电子光学系统。
9. If we introduce the aperiodic or periodic reversal of the nonlinear optical coefficient into the waveguides, the CSHG conversion efficiency can be improved greatly, the configuration also has been called quasi-phase matched CSHG (QPM-CSHG).
如果引入二阶非线性系数的周期极化反转，即考虑到准相位匹配的情况，切伦科夫倍频效率将会得到极大的提高，可以将之称为准相位切伦科夫倍频（QPM-CSHG）。
10. A new computational scheme was developed to solve a three-dimensional model of a periodic flow reversal reactor by ADI alternating direction implicit method.
文中针对圆管式径向对称流向变换反应器三维模型，利用交替方向隐式方法（ADI）建立新的求解格式。
11. The reversal reducer between the electric motor and the drum serves the functions of speed reducing and periodic reversal.
电动机和滚筒之间的换向减速箱，既有减速功能，又有周期换向作用。
12. The models for reactors with periodic flow reversal are usually nonlinear reaction-convection-diffusion equations with new type definite conditions.
流向变换反应器周期操作模型一般为非线性反应对流扩散方程的新型定解问题。
13. Large time behavior of the solutions to the models for a reactor with periodic flow reversal
流向变换反应器模型解的大时间性态的研究
14. Existence and boundedness of the solutions of the model for sulphur dioxide oxidation in a reactor with periodic flow reversal
二氧化硫催化氧化反应器流向变换周期操作模型解的存在性和有界性
15. Numerical simulation of a high-dimensional model of a periodic flow reversal reactor
流向变换反应器高维模型的数值模拟
16. danci.edu.pub
16. Research shows that some infectious diseases are affected by the El Ni ? o Southern Oscillation (ENSO) & a periodic reversal of currents in the Pacific Ocean that disrupts the world''s climate.
研究表明，一些传染病受到了厄尔尼诺/南方涛动现象（ENSO）的影响。ENSO是太平洋洋流周期性的逆转，它会破坏世界气候。