查询词典 acceleration note

The influences of the shock thickness and Alfven waves on the particle acceleration by diffusive shock waves are numerically studied through solving one-dimensional diffusive equation including the second-order Fermi effect. It is shown that the spectral index of the energetic particles strongly depends on the shock thickness. For example, the spectral index increases from 2.1 to 3.7 in the low energy range of 3-10 MeV and from 2.5 to 5.0 in the high energy range of 20-60 MeV as the thickness increases. The spectral index decreases from 4.3 to 3.1 as the particle injection energy increases. The spectral index decreases from 4.0 to 1.8 at the quasi-steady stage with the enhancement of the compression ratio from 2 to 4. The results indicate that under the influence of Alfven waves, the energetic particle spectrum at lower energy becomes flat and the spectral index decreases from 2.5 to 0.6 in the low energy range of 3-10 MeV and from 11.6 to 5.0 in the high energy range of 20-60 MeV. At the same time, the rollover energy reaches 19.6 MeV. The spectral index decreases from 5.8 to 2.9 as the energy density of Alfven waves increase. All these results are basically consistent with the theoretical models, as well as the observations of typical energetic particle events.

通过数值求解包含二阶费米加速的一维扩散方程，探讨在准平行激波条件下激波厚度和级联阿尔芬波对粒子加速的影响，研究粒子分布函数的演化与激波厚度和阿尔芬波强度的内禀关系，计算结果表明：(1)考虑激波厚度时，谱指数明显依赖于激波厚度，随着厚度从0.32增大到2.56，低能端(3-10MeV)谱指数逐渐从2.1增加到3.7，高能端(20-60MeV)谱指数从2.4增大到5.0，能谱逐渐变软；当初始注入粒子动量增大1.3倍，质子能谱指数从4.3减小到3.1，且与零厚度激波加速的谱指数差值缩小；厚度不变时，随着压缩比从2增加到4，准稳态分布时低能端(3-10MeV)粒子能谱指数逐渐从4.0减小到1.8谱变硬；(2)在级联阿尔芬波的影响下，随着时间的增大，粒子在低能处(3-10MeV)的谱指数从2.5减小到0.6高能端(20-60MeV)谱指数从11.6减小到5.0，能谱变硬，拐点能量值从7.5MeV增大到为19.6MeV；随着波的能量密度增大，谱指数从5.8减小到2.9，这表明阿尔芬波强度越大，加速效率越高，通过与激波厚度解析结果和高能粒子事件的观测能谱比较发现两者是一致的，说明数值模拟结果是可靠的。

The size and velocity of the droplets change continuously during their entrainment and acceleration in the hot gas combustion flow.

大小和速度的液滴不断变化的期间，夹带和加速度在炎热的气体燃烧流。

In addition, we find the standard DGP model has a late-time self-acceleration solution and its equation of state w

这些结果都非常的有意思，能够很好的与今天的天体实验观测符合，给出加速膨胀的宇宙的解释，从而预测未来的宇宙演化。

In Chapter 5, a scheme of the equilibrium iteration with a constant stiffness matrix is constructed by means of Steffensen's acceleration in the fixed-point iteration.

在第五章，我们利用不动点迭代的Steffensen加速方法构造了一个基于常刚度的平衡迭代格式。

This is again mainly due to the decrease of the equivalent moment of turning resistance with the increase of lateral acceleration.

这是又主要是由于减少了相当于时刻的转折与阻力的增加，横向加速度。

At the same time, ambient temperature changes affect the acceleration of the method There is a certain measurement error, but the error of law stronger, from the basic structure, measuring principle, numerical and other aspects of the process of measuring the inclination and measurement system The structure of error correction for analysis.

同时，由于环境温度变化时对加速度计的影响，该方法存在一定的测量误差，但误差分布规律性较强，因此从基本结构、测量原理、数值计算等方面对倾斜度测量的过程和测量系统结构误差的校正进行分析。

According to their proportions, arrange the evocable factors of accidents from bigger to smaller, and the result is as follows: handling stability, acceleration and brake performance, environment visibility, reliability.

按照事故诱发因素的比例由大到小地排列，其顺序是操纵稳定性，加速制动性，环境视见性和可靠性。

It is found that the calculated settlement of the dyke, acceleration and excess pore pressure of sand deposit are in good agreement with the results of model test.

在此基础上研究了堤坝的加速度、变形以及下卧液化场地中的超孔隙水压力分布规律，分析了液化场地不同位置土层中的有效应力路径变化规律。

The acceleration of the ground surface, excess pore water pressure ratio at GL?

加速地面，超孔隙水压力的比例在GL的？

And the amount of calculation load is less than the linear acceleration shift control method and the method which is based on the exponential rule to change speed.

而且它的计算量比线性加速度变速和基于指数规律加速度的变速控制小得多。

Use nationalization degree and the relationship that commercialize degree, condition of calculable market economy plays scope of optimal and state-owned economy.

利用国有化程度与市场化程度的关系，可计算市场经济条件下最佳国有经济规模。

The kinds of extractant also effected desulfurization rate .

萃取剂对脱硫率的影响也很大，乙二胺的萃取效果优于甲醇的。