focal ratio 中文意思是什麼
focal ratio
解釋
焦比-
Aiming at the application of the telescope, the main performance of the fiber are the spectral - transmission efficiency and the focal - ratio degradation
針對此望遠鏡的應用，對光纖的要求主要集中在對星光的傳輸性能和焦比蛻化性能上。 -
Sum - of - gradient - magnitude measure is chosen to adapt all images with different enlargement according to analysis of focusing measures ’ character. for 3d bond targets, it is explained that why focusing window should be placed accurately. efficiency of the whole system is ensured by analyzing shift of focal plane when enlargement ratio is changing
為了保證快速採集到鍵合器件的清晰圖像，通過對調焦評價函數特徵的分析，選擇能夠適應各個放大倍數顯微圖像的梯度作為系統的自動調焦評價函數;針對三維器件說明了調焦窗口正確放置的原則和必要性;分析了變倍過程中聚焦平面位置的變化規律，提高了自動調焦的效率。 -
In chapter 3, by using theoretic analysis the focusing properties of an ideal annular beam is demonstrated. the intensity distribution near the focal point is given explicitly to show the influence of the ratio of inner to outer radius
第三章，從理想的環形光束出發，先在理論上分析了環形聚焦光束在焦點附近的光強分佈情況和光束內外徑之比（占空比）對聚焦性質的影響。 -
Numerical result illustrates that focal length becomes longer when incident wavelength becomes shorter, however the relationship between focal length and incident wavelength is n ' t absolute inverse ratio, it is that the increasing of focal length is faster than the decreasing of incident wavelength. at the same time the numerical result also show that scalar theory ca n ' t be used in the rigorous analysis of the dispersion property of subwavelength diffractive microlens
然後研究了亞波長衍射微透鏡的色散特性，表明亞波長衍射微透鏡的焦距隨著波長變短而增加，但是波長與焦距之間並非簡單的完全反比例關系，而是隨著波長的減小焦距增加得更快，同時指出標量理論已不能準確分析亞波長衍射微透鏡的色散特性。 -
In the part 1 and 2, the article throws light on concepts concerned at first, then analysis of process and features about industrial development zones in shanghai are mainly discribed in the part 3. as the focal point, the economic effect of development zones in shanghai is analyed in detail in part 4. first of all. the impact of development zones on regional an metropolitan economy is theoretically studied. then. the thesis focus on the economic effect of development zones in shanghai by analying the land development ratio. investment strength. output effect per person and per km2, and comprehensive economic effect with multi indicators. part 5 studies the patter of management and absorbing foreign investment in industrial park
首先，從理論上闡述了開發區對城市經濟和區域經濟發展的重要作用。然後，通過對上海主要開發區的土地開發率、投資強度、人均產出率、地均產出率和多指標的綜合經濟效益分析，對上海主要開發區的經濟績效進行了較詳盡的分析，並將分析結果進行了小結。在分析綜合經濟效益時，作者運用統計軟體進行了系統聚類分析，將開發區的經濟發展水平劃分為四大類。
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