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It is shown that the far-field divergence angle of nonparaxial rotationally LG beams approaches to an asymptotic value of 63.435° as the initial waist-width to wavelength ratio w0/λ approaches zero,which is independent of the order.

计算结果表明，当初始束腰宽度和波长之比w0／λ趋于0时，对任意非傍轴旋转对称LG光束，远场发散角趋于渐近值63.435°，与阶数无关。

New sub-models for the four-way valve and the boost pump have been created by combined models. The initial parameters for the calculating analysis were determined at a rough estimate. The model has also been tested, modified and improved.

所构建的双燃料喷油器的计算模型能够较好的模拟复杂的双燃料结构特点和工作过程；采用模块组合的方法构造了四通阀和增压泵等新组件；采用估算的方法，确定了计算分析的初步参数；并对双燃料喷油器的计算模型进行了验证、调试和改进。

At first blush, DiMaria's initial comments could have been "sour grapes."

一开始，似乎迪玛利亚的言论是吃不到葡萄说葡萄酸。

The results can tend toward infinity at different rates or toward zero, even though the initial points are very close together.

结果以不同速率趋向无限大或趋向零，即使初试点是非常接近。

To recover the initial conditions of coupled map lattices, which goes athwart the coupled systems, is one of key tasks of signal processing.

从耦合映像格子中，恢复系统初始条件是耦合系统求逆问题，也是信号处理研究中的一个关键性问题。

Quantum mechanics, which evolved in the early nineteen-twenties, had its initial thrust in the area of atomic physics.

本世纪20年代初期发展起来的量子力学，其最初取得的突破是在原子物理学的领域中。

The results show: 1 attenuation of available chlorine of bleaching powder in water follows the eqution ρ=a+be-kt,attenuation ratio constant increases with reduction in initial concentration of available chlorine, high temperature, increase in COD and light and decrease in pH.

关于漂白粉在养殖生产中应用的研究不多，赵增元等[1]报道了漂白粉在改善对虾池水环境方面的一些结果，王勇强[2]就其对细菌性虾病防治的药理进行了研究，刘长发等[3]报道了漂白粉的清塘效果及其对虾池水质的影响。

The results show: 1 attenuation of available chlorine of bleaching powder in water follows the eqution ρ=a+be(superscript -kt), attenuation ratio constant increases with reduction in initial concentration of available chlorine, high temperature, increase in COD and light and decrease in pH.

结果表明：1漂白粉有效氯在水中按ρ=a+be规律衰减，衰减速率常数随初始有效氯浓度的减小、温度的升高和COD的增大而加快，随pH的下降和光照强度的增加而增加。

Compared to wet season, arsenic is difficult to mobile in dry season. Attenuation constant in dry season is 0.3082(1/km), but it is 0.0569(1/km)in wet season. If initial concentration of As was 500μg/L without other contamination source in down stream, arsenic would deceased to 50μg/L in down stream 7.5km in dry season but 40km in down stream 40km. As is dominate species in river running throμgh mining area.

砷在枯水期较丰水期难以迁移，通过计算得到，在枯水期砷的衰减系数K值为0.3082(1/km)，而在丰水期为0.0569(1/km)；在污染口浓度达到500μg/L时，下游没有其它的砷的污染源(或会影响砷衰减的其它污染源)时，枯水期砷会在下游7.5km之后浓度降到50μg/L，而丰水期则要在下游40km之后才能降到同样的值，所以在丰水期砷污染的影响的流域更广。

To speed up the pace of urban construction, urban population growth, improving the initial function of the city, the surrounding areas to form a strong radiation, attractive, and driving force.

城市建设步伐加快，城市人口增长较快，城市功能初步完善，对周边地区形成了较强的辐射力、吸引力和带动力。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。