natural logarithm 中文意思是什麼
natural logarithm
解釋
自然對數-
The natural logarithm of this ratio is called the logarithmic decrement.
此比率自然對數稱為對數的減量。 -
The dissertatio n constructs the index system, introduces the coefficients of development, coordination, fairness, and the coefficient of sd, which is composed by the former three and can reflects the sd overall strength of watershed, brings forward the quantative criteria of in order that the research of wrcc is based on the good watershed ecology and environment, the dissertation, according to the ecological appropriate theory, builds the logarithm normal distribution model about the relation between the growth of natural vegetation and the depth of groundwater ; based on this relation model, proposes a quantitative method of ecological water requirement ( ewr ) of natural vegetation in arid area, which utilizes the results of rs technique and the spot testing data of vegetative physiology demand
針對流域特點建立了基於水資源的流域可持續發展評價指標體系，引入發展系數、協調系數、公平系數，以及由其構成的衡量水資源支撐社會可持續發展綜合水平與能力的可持續發展系數，提出了可持續發展的定量判別方法。為保證在良好生態的前提下進行水資源承載能力研究，論文根據生態適宜性理論，建立了乾旱區典型天然植物生長與主要環境因子的偏態單峰對數正態分佈模型。基於此關系模型，利用遙感技術成果以及植物生理需水的現場實驗數據，提出了乾旱區天然植被生態需水量計算方法。 -
Returns the natural logarithm of a numeric expression
返回數值表達式的自然對數。 -
The empirical results show : it is weak to explain the portfolios " return for 6 risk - metric indices, however, the two factor variables, the natural logarithm of average circulated market equity and the average of short - term ( one year ) historical return, are able to expla
實證研究結果發現: 6種風險度量指標對股票組合收益率的解釋能力十分微弱，而平均流通市值的自然對數和平均短期（ 1年）歷史收益率2個因素變量對股票組合收益率的解釋能力達到76 . 2 % 。 -
To combine it with the virtue of valuable earthquake damage experience accumulated in china and stored in damage matrix, an inversion strategy is designed to search seven ratios of 4 spectral displacements of buildings to the median values of spectral displacements of 4 damage states by the criteria of the convergence of the values of the standard deviations of the natural logarithm of the spectral displacements of four damage states as the objective function, a hybrid procedure integrated the simplex with the generic algorithm is adopted and the program is updated for this purpose from an existing one
為了說明本文方法的實用性，以xx市xxx區的多層砌體房屋為例，根據地震危險性、建築物易損性、建築物和室內財產損失率、人口死亡率，分別計算出房屋、室內財產的期望損失率和損失率的方差、人口的期望死亡率和死亡率的方差，得到純費率，設附加費率為純費率的一定比例，求得毛費率。 -
The probability of being or exceeding a given damage state of buildings by a given ground motion intensity is calculated from the spectral displacement corresponding to the intersecting point of the demand spectrum and the capacity curve, the median value of spectral displacement at which the building reaches the threshold of the damage state and the standard deviation of natural logarithm of spectral displacement of the damage state
文中，討論了非彈性需求譜的推算，將現行抗震設計規范中規定的反應譜換算得到的彈性需求按對應的譜位移折減，得到非彈性需求譜。依對應的譜位移在四個需求譜上的四個點和原點，構造了典型建築物的抗力曲線。 -
Calculates the natural logarithm of a quaternion
計算四元數的自然對數。 -
Calculates the natural logarithm of the specified quaternion
計算指定四元數的自然對數。 -
Replaces the current quaternion with its natural logarithm
用當前四元數的自然對數替換此四元數。 -
The log ( ) function returns the natural logarithm ( base e ) of a number
函數的作用是：返回一個數值的自然對數。 -
Calculates natural logarithm of an
的自然對數。 -
To illustrate and validate the method developed in this paper, 4 spectral displacements of buildings corresponding to 4 intensities, 4 median values and 4 standard deviations of natural logarithm of spectral displacements
與再保險不同，發行巨災債券沒有任何信用風險，不需要對發生的損失進行賠償，可降低保險商破產的概率和損失。
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