f-number 中文意思是什麼

f-number 解釋
n. 名詞 【攝影】光圈數。

  • f : 1 【化學】 fluorine 2 【生物學】 （generation of） filial offspring; 【植物；植物學】子代 〈F1 雜...
  • number : n 1 數；數字；〈pl 〉算術。2 （汽車等的）號碼；第…，第…卷，第…期〈通常略作 No （復數 Nos ），用於...
  1. Deng x g, zhuang f g, mao m l. on low mach number perfect gas flow calculations [ r ], aiaa paper 99 - 3317

    鄧小剛.粘性超聲速復雜氣動力干擾的數值模擬[ d ] : [博士學位論文] ，中國空氣動力研究與發展中心， 1991
  2. We compare the approximation of an analytic function f by its taylor polynomial and its poisson partial sum with the same number of terms and illustrate that for functions with limit zero at infinity and for bounded functions the poisson expansion provides a better approximation to the function than the taylor expansion

    在第三章中，介紹了rb曲線與poisson曲線的概念以及基本的幾何性質，指出了poisson基函數與有理bernstein基函數之間存在的關系，並且將解析函數的taylor逼近與poisson逼近進行比較。實例表明，對于在無窮遠處極限為0的函數以及有界函數， poisson逼近比taylor逼近效果要好。
  3. The number a is called a double root of the polynomial function f.

    數a稱為多項式函數f的二重根。
  4. Second, we discuss the influence of environmental referance potential temperture and thermal wind on mesoscale symmetric instability. we find the expression of disturbance stream function and criterion of symmetric instability by analytical method and conclude that change caused by environmental referance potential temperture with height and thermal wind make critical richardson number and disturbance critical half - wave length of symmetric instability larger, that is to say, they benefit the occurance of symmetric instability. third, we study nonlinear perturbation analysis of mesoscale vertical circulation and evolution equation by means of f - plane. non - hydrostatic balance and filiter model

    第二，討論了環境位溫與熱成風因子對中尺度對稱不穩定的影響。運用解析的方法求出了擾動流函數的表達式和對稱不穩定的判據，發現環境參考位溫隨高度的變化與熱成風因子使得對稱不穩定臨界理查遜數及擾動的臨界半波長都變大，這有利於對稱不穩定的發生。第三，採用f平面、非靜力平衡、濾聲波模式，討論了中尺度垂直環流非線性攝動分析及演變方程。
  5. 4 ) the number and mass concentration distributions of the background atmospheric sand particles of ymchuan, bayanhot and tonggunur display a unimodal form, obeying a logarithmic normal distribution, greatly differing f

    黃沙的長距離輸送和小雨是泥雨形成的原因。雲物理和降水與來自沙塵粒子混合，尤其是小於zpm的粒子，導致了華北地區泥雨的發生。
  6. For a - early f type ms stars, stellar chromospheric activity decrease with stellar rotation period, but increase with rossby number ; for m type ms stars, stellar chromospheric activity increase with stellar rotation period and rossby number, and stellar chromospheric activity reach saturation at large color index ; for the ms stars between mid - f to m type, stellar chromospheric activity decrease with stellar rotation period and rossby number

    A ?早f型主序恆星的自轉周期和恆星對流區的隨色指數的分佈明顯地影響著這些恆星的色球活動行為。而m型主序星的色球活動水平基本上隨自轉參量的增大呈上升趨勢，並且m型主序星的色球活動水平在色指數較大時趨于飽和。
  7. In the present paper, we consider the problems of the conjugacy classes of the torsion matrices of order p or 2p in gln ( f ] and sln ( f ), and we determine the formula of the number of the conjugacy classes in gln ( f ] and sln ( f ] completely

    本文給出了p階與2p階幺冪矩陣在gl _ n （ f ）和sl _ n （ f ）共軛作用下的共軛類個數的遞推計算公式。
  8. Abstract : according to the theory of difference analysis, this paper proposed using mixed - f statistic to determine the optimal class number of fuzzy cluster, and using fuzzy partition entropy to verify whether the class number is optimal, the optimal class number can be determined by the two statistics mentioned above correctly

    文摘:根據方差分析理論，提出應用混合f統計量來確定最佳分類數，並應用模糊劃分熵來驗證最佳分類數的正確性，綜合運用上述兩個指標可以準確確定最佳聚類數。
  9. The following results are obtained : ( 1 ) the flow in rotating helical pipes are affected by dean number, curvature, torsion ( or germano number ), the ratio of the coriolis force to the centrifugal force f number ( or rossby number ) and the geometry of the cross section

    研究結果表明： （ 1 ）旋轉螺旋管道流動特性受dean數、曲率、撓率（或germano數） 、科氏力與離心力之比f數（或rossby數）以及截面的形狀五種因素的影響。
  10. A. f. s grain fineness number

    粒度指數
  11. In this paper, by checking up the heat calculation about the experiment results of the single row tube and double waves belt, i come at the function of the heat transfer factor j and the reynolds number re, i also come at the function of the f r i ct i on factor ^ " and the reyno i ds number re

    本文還通過對單排雙波帶散熱器的實驗結果進行校核熱計算，回歸導出該種散熱器的傳熱因子j及摩擦因子f與雷諾數re的數學表達式，從而為用這種芯子根據廠家要求設計散熱器提供了理論依據。
  12. F. due to the tremendous number of motorcycles, suitable transportation regulation measures, safety education and related propaganda need to be established, especially for dealing with shared right of way as well as for the confrontations that occur at intersections

    此部份路線設置三個車站，分別位於信義計畫區南北側及中心地帶，南北二站分別與高運量捷運信義線、南港線銜接，主要在於服務信義計畫區之大量旅次。
  13. The weir wed packing with high number of theoretical stages and minimum pressure drop permetre. small hold - up, most economical load range : f factor 1. 52m skg m3. minimum liquid load approx : 0. 2 m3 m2h

    該填料每米有較高的理論板數，每米填料的壓降低，持液量低，最佳的負荷因子1 . 52m s根號kg m
  14. Test method for determining floor flatness and levelness using the f - number system

    用f -值系統測定地板平直度和水平度的試驗方法
  15. Photographic lenses - methods for the measurement of the effective aperture, f - number and relative aperture

    攝影鏡頭.有效孔徑光圈數和相對孔徑的測量方法
  16. For almost alternating knot, we proved that the genus of f equals zero when the number of components of f is less than eight

    對于幾乎交錯紐結，證明了當時，的虧格為零。
  17. To efficiently reconstruct the topological structure of a large number of stl ( stereolithography ) data, the integrating vertex algorithm of the avl tree based on the v - f structure is promoted to delete a large number of repeated vertexes and reduce the size of data file

    （ 2 ）提出了基於v - f （點-面）存儲結構的avl頂點聚合演算法和基於虛avl的鄰邊搜索優化演算法。
  18. Photographic lenses - f - number marking

    攝影鏡頭.光圈刻度
  19. The paper studies the resource and technology about carrying out of the project by the methods and theory of management science and economics, lays stress on analyzing the demand and competition condition, demonstrates economy nature and undeterminable nature of the project. the paper ' s purpose is to give some profit references to f - number policy - making for the project

    本文運用管理學和經濟學的理論和方法，對該項目實施的資源和技術做了研究，著重分析了該項目產品的需求和競爭狀況，並對實施該項目的經濟效果和不確定性做了分析評價，旨在為晨通公司的項目決策提供有益的參考。
  20. Load the high speed film, open the lens to its lowest f number and focus at infinity. select b for the shutter setting. mount the camera on a tripod and aim it at the desired region

    用廣角鏡或標準鏡的相機，裝上快速底片，光圈全開，鏡頭調至無限遠，快門選b掣，用腳架支持相機指向欲攝的天區，用快門繩打開快門，曝光幾分鐘到一小時的固定攝影法，會把偶然出現于鏡頭前方的流星攝入底片。
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