| 1. | Phenomenal analysis of fine structure constant
发生改变的唯象分析 |
| 2. | These energy levels are determined by how tightly the atomic nucleus holds the electrons , which depends on the strength of the electromagnetic force between them ? and therefore on the fine - structure constant
能阶是由原子核拉住电子的松紧程度所决定，而这又取决于能阶之间的电磁力强度，因此便和精细结构常数关系密切。 |
| 3. | These findings complement recent contentious observations that the fine - structure constant , which describes the overall strength of the electromagnetic force , has increased slightly
这项发现为近来一项引人争议的观察做了补充：用来描述电磁力总体强度的精细结构常数，已经些微增加了。详情请见4月21日的《物理评论通讯》 。 |
| 4. | The fine - structure constant is an important zero dimension constant in the atomic physics . this article introduces the origin of fine - structure constant , and discusses its physical significance , and theoretical calculation
摘要本文介绍原子物理学中重要的无量纲常数之一的精细结构常数的由来，讨论它的物理意义和理论计算。 |
| 5. | And we also make the simulation of space - to - ground optical propagation by using the software of matlab , including scintillation , turbulent structure constant of atmosphere and spot of horizontal optical propagation
并用matlab语言实现了对空-地激光传输的光功率闪烁、大气结构常数以及湍流大气中的水平激光传输远场光斑的计算机模拟仿真。 |
| 6. | An atmosphere structure constant cn2 model , which varies with height , is presented based on itu - r amplitude scintillation model , existing itu - r optical cn2 model and meteorologic measurement relative humidity and temperature profile data , at 10 ~ 30ghz . the log - amplitude scintillation deviation calculated in terms of the cn2 model based on humidity and temperature vertical profile compare with values predicted by means of itu - r and ortgies model . it is emerged that the calculation results based on the cn2 model agree almost with prediction results by itu - r and ortgies model at 10 ~ 30ghz and there is an advantage that relative humidity and temperature varied with height has be considered in the cn2 model
根据光波段的itu - rc _ n ~ 2模型， itu - r幅度闪烁标准偏差模型，和温度和相对湿度随高度变化的气象数据，在10 30ghz ，分析得到了大气结构常数c _ n ~ 2随高度变化的模型；并根据温度和湿度垂直分布数据计算了对数幅度闪烁_ x ，还与itu - r和ortgies模型的预测结果进行了比较，结果表明，在10 30ghz ，用该c _ n ~ 2模型计算的结果和用itu - r及ortgies模型预测的值符合较好，且在用c _ n ~ 2模型计算时考虑了温度和相对湿度随高度变化关系。 |
| 7. | Under our task experimental condition , we calculated the sensitivity of our planning to develop dial system with direct detection , besides , we studied the relationship between the sensitivity of measurement and atmospheric refractive - index structure constant and applied matlab program simulated the system parameters such as beam diameter , laser divergence angle , detection distance and gained relevant relationship curves
在课题实验条件下，模拟计算了直接检测dial系统的测量灵敏度。在考虑大气折射率结构常数对系统测量灵敏度影响的基础上，并对各种系统参数如光束半径、束散角和探测距离对测量灵敏度的影响运用matlab程序做了仿真计算，为合理选择系统设计参数提供了依据。 |
| 8. | Since the effects of turbulent atmosphere is prominent , this thesis concentrates on the effects of the turbulent atmosphere on the laser beam propagation in the atmosphere . the atmosphere refractive index model , especially refractive index fluctuation , power spectrum , phase spatial structure constant are introduced in the following and the specific structure function is achieved
根据大气折射率模型，以及折射率起伏功率谱密度和相位空间结构常数，得到具体的结构函数；通过长程情况下的马尔科夫近似，得到了互相关函数，对数振幅和相位协方差函数。 |
| 9. | We have the following results through simulation and experiments : i ) turbulent structure constant of atmosphere decreases with altitude ; ii ) turbulence induced power scintillation decreases with the optical wavelength ; iii ) scintillation of space - to - ground optical propagation is smaller than that of horizontal optical propagation ; iv ) power scintillation of space - to - ground optical propagation increases with wavelength ; results above are accord with existent theory . what ' s more , the last result discovers a new rule
通过对数学模型和仿真结果的分析，得到以下结论： a )大气湍流结构常数随海拔高度的增加而迅速减小； b )由湍流引起的光功率闪烁与波长呈反比； c )空-地激光通信的光功率闪烁小于地面水平传输的闪烁； d )空-地激光通信的光功率闪烁与波长呈正比；上述结果与理论保持一致。 |
| 10. | According to the theory of optical wave propagation in the slant path and the itu - r turbulence structure constant model , which is altitude dependent and proposed in 2001 , the modified rytov method is extended to be applied to study on the problems , which waves propagate in the slant path . the scintillation index as a function of the rytov variance is obtained from weak to strong fluctuation regions with plane wave and sphere wave incidence , respectively
根据斜程传输理论和2001年提出的itu - r湍流大气结构常数模型，将修正pytov方法推广应用于斜程传输问题研究，得到了平面波和球面波斜程传输时的闪烁指数，分析了湍流内尺度、近地面风速等参量对闪烁指数的影响。 |
