assimilation time 中文意思是什麼

assimilation time 解釋
同化時間
  • assimilation : n. 1. 吸收（作用）。2. 同化（作用）。
  • time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
  1. The results of numerical experiments, using the four - dimensional variational data assimilation system of the nonhydrostatic mesoscale model mm5, show that : the tangent linear model and adjoint model conducted by keeping the " on - off " switches the same as the basic state, can provide a good approximation of the first - order information to the nlm perturbation and a good descent direction for the minimization procedure ; switching on and off at every other time step in the kuo cumulus parameterization scheme do n ' t impact the convergence rate of cost function ; the existence of the switches do n ' t impact improvement to the mm5 model rainfall prediction because that not only specific humidity, but also wind, temperature and pressure are assimilated into the model

    非靜力中尺度數值模式mm5的四維變分資料同化系統進行的數值試驗結果表明： 「開關」變量保持與基態一致，所構造的切向線性模式能夠提供關于非線性模式擾動的一階近似，伴隨模式所計算的梯度值能夠為最小化過程提供較好的下降方向；郭氏降水參數化方案中對流每隔一個積分步的交替發生並不影響目標函數最小化的收斂速度； 「開關」變量的存在也不影響將風、溫度、氣壓和比濕結合起來同化對mm5降水預報準確性的提高。
  2. As an efficient approach to improve the accuracy of numerical weather prediction, four - dimensional variational assimilation is widely focused on by the domestic and overseas experts. one of its important characteristics is that the data in one time can influence previousanalysis results, which can not only provide the optimized initial condition but also make up observation datum ' s absence in some areas

    四維變分同化方法作為一種提高數值天氣預報的有效方法受到國內外專家的廣泛關注，其重要特點是一個時次的數據可以影響到它以前時間的分析結果，因此不但可以為數值預報模式提供初始場，而且可以對觀測資料不足的地區加以彌補。
  3. The results indicated that cynanchumkomarovii is sensitive to soil water from root to shoot, which apparently become slower and even stopped growing with water stress aggravation and the time of stress increase, but the root - shoot ratio increased. the soluble sugar is primary osmolyte in roots of cynanchum komarovii, which increased markedly with water stress aggravation, while soluble sugar in leaves decrease. the results showed that assimilation of cynanchum komarovii mostly distributed to root

    5 、隨著土壤水分脅迫程度的加重，根系中的可溶性糖呈明顯的增加趨勢，葉中的可溶性糖則隨脅迫的加重而呈下降趨勢，說明在乾旱脅迫下牛心樸子的同化產物大部分分配于根系之中；脯氨酸（ pro ）在牛心樸子葉、莖、根的滲透調節中也起著一定的作用，隨土壤水分脅迫的加重，其在根、莖、葉中的積累明顯增加；而無機離子（ k ~ + 、 na ~ + 、 ca ~ （ 2 + ） ）在牛心樸子滲透調節中的作用似乎很小。
  4. In this context a genetic algorithm ( ga ) was applied to the four - dimension ( 4 - d ) variational data assimilation, which provided a kind of new and effective method in the initial field optimization. the theoretical basis and detailed algorithm were introduced in this paper. at the same time, according to the property of the variational problem itself, we designed the rational genetic coding, operators and parameters

    本文將遺傳演算法應用於四維變分資料同化問題，提供了一種新的較為有效的nwp初始場優化方法，給出了相應的理論依據和詳細演算法，並結合變分問題本身的特點，設計了合理的遺傳編碼、遺傳操作和遺傳參數。
  5. As for the demands of packing machine in indraught and assimilation, the combination of reverse study and genetic algorithm and original packing technique was proposed. this idea was used for the mechanical machine design. at the same time, some topics concerned with inverse study of packing machine theory based on the genetic algorithm modeling were presented

    針對我國包裝機械引進、消化、吸收的需要，提出將反求技術、遺傳演算法與包裝技術結合應用，開發包裝機械機構設計，並對建立基於遺傳演算法的包裝機械機構設計反求工程研究所涉及的問題進行了探討。
  6. The assimilation experimentation results indicate that after assimilating radar wind field of small spatial scale, mesoscale and small - scale precipitation prediction can be improved and mesoscale and small - scale information which ca n ' t appear by tradition datum can be gained, which is valuable to analyze the mesoscale and small - scale system structure ; the effect assimilating radar humidity field is n ' t obvious, which is perhaps correlation with precipitation types and assimilating time. the results also show that adding radar humidity field to initial condition at initial time can supply the gap of the regular data in reflecting the mesoscale and small - scale systems, strengthen the humidity in the initial field, and eventually help to improve precipitation. the experiment of assimilating radar wind field and radar humility field at the same time shows that vapor transportation and local vapor divergence play more significant role in causing excessively heavy rain than only high wet center

    同化試驗結果表明：同化空間解析度很高的雷達風場后，能改善中小尺度降水的預報效果，並且能夠得到常規觀測資料所不能得到的中小尺度信息，對分析中小尺度系統結構具有重要意義；同化雷達濕度場效果不明顯，可能與降水類型和同化時刻有關；而直接在初始時刻加入雷達濕度場，補充了常規資料在反映中小尺度系統方面的不足，增強了初始場中的水汽，有利於降水量的增加；同時同化雷達風場和雷達濕度場的試驗表明，水汽的輸送和局地的水汽輻合對于產生特大暴雨的貢獻遠大於僅有高濕中心的貢獻。
  7. Based on this, the numerical model is used in the south china sea. the upper thermocline is the first level, and the rest is the second level. the initial values kv of assimilation is 2. 0xl ( t4 / ? 1s ' ~ l and the time window of assimilation is 1 month

    在此基礎上，我們將該模式應用於南中國海，分層取在溫躍層處，選取2 . 0 10 ~ （ - 4 ） m ~ 2s ~ （ - 1 ）為垂直混合系數的同化初值，同化時間長度為一個月。
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