valid approximation 中文意思是什麼

valid approximation 解釋
允許近似值
  • valid : adj 1 （理由、證據等）有確實根據的，確鑿的；正確的；健全的，站得住的。2 【法律】（契約、選舉等）...
  • approximation : n. 1. 接近；近似。2. 【數學】近似值。3. 概算，略計。
  1. By using the yearly data of water - sand that is gotten by a couple of adjacent hydrologic station in yellow river lower reaches, this paper makes use of kinds of math methods looking for the nonlinear disturbance among all of the factors, and introduces the thinking of analysis, logic, conclusion, inference, and random to nonlinear hydrologic forecasting. it realizes the valid approximation of the water level process in erodible - bed channel

    本文選擇黃河下游兩對相鄰水文站多年水沙資料，藉助多種數學方法尋找其中的非線性擾動項，將隨機數學中分析、邏輯、歸納、演繹、隨機的思考問題方式引入到非線性水文預報中，實現沖淤河道相應水位過程的有效擬合。
  2. Analyses of valid range for the linear approximation in a single - mode laser

    單模激光系統線性化近似適用范圍的分析
  3. The results demonstrate that the theory predicted values of compression, bulk modulus, linear expansion, and thermal expansive coefficient of compressed solids are very agreement with the corresponding experimental data. in summary, the error with respect to theory prediction and its causes are pro bably analyzed in detail. the discussion suggests that the function of the phenomenological short - distance repulsive force constant a ( v ) and approximation for anderson - griineisen parameter 5t ( v ) proposed in this paper are valid and applicable in high pressures ( up to loogpa ) and high temperatures ( from debye temperature 0d to melting temperature tm ) for many types of solids

    在本文最後一節，為了驗證固體在等壓過程中anderson grhneisen參量乓與體積膨脹的唯象假設：乓久w兀的有效性，及由此假設而推導出來的等壓態方程的廣泛應用性，本論文主要針對十六種堿金屬鹵化物、三種堿性氧化物、三種硅酸鹽礦物質的線膨脹八n 、體積熱膨脹v vo （ n 、熱膨脹系數a （ n 、體積彈性模量肘d等隨溫度的變化作了理論上的預測，且與相應的實驗數據作了比較與分析
  4. The condition, under which the paraxial approximation is valid, is given. 4. starting from the rayleigh diffraction integral, the propagation equation of ultrashort pulsed beams in dispersive media has been derived without making the paraxial approximation and slowly varying envelope approximation ( svea ), which allows for relatively large angles

    從瑞利衍射積分公式出發，未作慢變振幅近似和近軸近似的條件下，導出了等衍射長度超短脈沖高斯光束在色散介質中非近軸傳輸方程，可用來處理色散介質較大角度的傳輸。
  5. For any approximation to be valid it must provide a result that is in some sense close to the solution of the original problem.

    任何有效的近似式必須在某種意義上提供一個接近於原問題解的結果。
  6. In order to illustrate the valid range of the axial intensity expression and approximation formulae numerical results of both the methods are compared

    使用軸上光強公式和近似公式對焦移計算結果的比較證明了近似公式的適用范圍。
  7. At the same time, the " stop - hop - stop " approximation is no longer valid in sas due to the low speed of sound. the receiver has unavoidable movement, when echoes get to receiver from different distances. in order to overcome the problem, an image forming algorithm of multi - aperture sas is presented in the thesis, which is suitable for the case of non - " stop - hop - stop "

    為了解決測距、測速模糊問題， sas通常採用多子陣技術，而且由於sas 「停?走?停」假設往往不再有效，即測繪帶內不同距離回波到達基陣時，基陣存在不可忽略的運動，所以論文提出了一種「停?走?停」假設不成立條件下的多子陣合成孔徑聲納逐點成像演算法以得到相位保真度更高的復圖像。
  8. The analysis of valid range of the linear approximation in a loss model with a single - mode laser

    三階近似激光模型線性化近似適用范圍的分析
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