numerical approximation 中文意思是什麼

numerical approximation 解釋
近似數值
  • numerical : adj 數字的;數值的;用數字表示的。 (a) numerical order 號數。 a numerical statement 統計。 the ...
  • approximation : n. 1. 接近;近似。2. 【數學】近似值。3. 概算,略計。
  1. The thermodynamic free energy on mixing and the spinodal equation in ternary homopolymer blends were obtained by making plausible approximation based on flory ' s equation of state theory. because of the non - linear behavior of the spinodal equation, a numerical solution approach was used and succeeded in solving the problem. spinodal of polystyrene ( ps ) / poly ( vinyl methyl ether ) ( pvme ) / poly ( 2, 6 - dimethyl - 1, 4 - phenylene oxide ) ( ppe ) were simulated over a wide temperature range and the calculated result was coincidence with that of the literature

    將上述方法用於已知狀態方程參數的二元均聚共混體系聚苯乙烯( ps ) /聚甲基乙烯基醚( pvme ) ,三元均聚共混體系聚苯乙烯( ps ) /聚甲基乙烯基醚( pvme ) /聚2 , 6 -二甲基1 , 4 -苯撐氧( ppe ) ,得到一系列不同溫度下的spinodal相圖,預測結果與文獻報道吻合,在此基礎上進一步研究了聚合物的分子量對體系相行為的影響。
  2. Abstract : the effect of correction of self - consistent potential on electronic structure in simple cubic nanocrystal particles is calculated by means of the green ' s function method in the tight - binding approximation, taking only the nearest neighbor matrix elements into account. the numerical results show that the electronic energy spectrum is shifted, the chemical potential is not equal to the atomic energy level, the electronic density at each lattice point is changed, and the variation of electronic density at surface lattice point is the largest

    文摘:在緊束縛近似下,只計及最近鄰的矩陣元,採用格林函數計算了自洽勢修正對簡立方納米晶體顆粒的電子結構的影響,發現電子能譜發生了移動,化學勢不等於格點原子能級,各格點的電子密度也發生了變化,其中以表面格點的電子密度變化最大。
  3. Except for method of spline interpolation, mra method are used to resolve numerical approximation problems, too

    除了應用樣條函數插值方法外,解決數值逼近問題還可以採用小波分析中多尺度分析的方法。
  4. Numerical procedures of upper - bound approximation of shakedown loads and its application in engineering

    安定荷載上限近似解的數值分析方法及其應用
  5. And then we found and testified two examples, in which the connections in n - variable mean fam - ily, countable mean family and continuous mean family are shown. the theory in this paper prepares for the further application in convex analysis, numerical approximation, cagd, probability and statistics. etc

    文中還給出了連續平均族的兩個具體的實例,對這兩組平均族進行了證明,並找出了其中蘊含的連續平均族與可數平均族、 n元平均族之間的聯系等等
  6. Numerical experiment is not the direct proof to theory, but its approximation to the fact is trustful. thus, it provides important clues for further theory research

    數值實驗結果雖然不是理論的直接證明,但是其近似真實情況的可靠性是值得信賴的,這無疑對進一步的理論研究提供了重要線索。
  7. Numerical approximation of hopf bifurcation for delay logistic differential equation

    分支參數值的數值逼近
  8. Numerical approximation of interface problems for elliptic differential equations

    橢圓型方程內邊界問題的數值逼近
  9. In this paper, three numerical approximation problems are discussed in some reproducing kernel spaces

    本文主要針對某些再生核空間討論了數值逼近中的三個問題。
  10. It is discussed that the numerical approximation of interface problems for elliptic partial differential equations

    討論了橢圓型偏微分方程內邊界問題的數值逼近。
  11. Numerical approximation for a singularly perturbed problem by equidistributing

    用等分佈原理求解一類奇異攝動兩點邊值問題的數值演算法
  12. In the space, wavelet approximation formula and sampling formula are gived and these are simple and easy for calculation. it is a new attempt to establish mra in the reproducing kernel space. this not only makes up existing researchful defects but also gives a better method to resolve numerical approximation problems and it further enriches the reproducing kernel theory and wavelet method. this provides more applied method for resolving numerical approximation problems in the space which is often used in the engineering

    在再生核空間中建立的多尺度分析方法是利用再生核工具探討小波理論的又一次大膽的嘗試,它不但彌補了現有研究的缺憾,而且給出了解決數值逼近問題的一個新思路,進一步豐富了再生核理論,充實了小波方法,這為在工程中常用的空間中解決數值逼近問題又提供了一種較為實用的方法。
  13. Comprehensively discuss the issues in application, adaptive condition and performance, propose a fast arithmetic of forward modeling and depth migration in common shot gathers with one - way acoustic wave equation based on vrselrf, and verify the arithmetic by numerical simulation. concisely discuss the cause of the creation of evanescence and the problem of lateral amplitude discontinuity result from it. fourthly, use the reflectivity model, computed to describe the fracture model, with the formula of computation reflectivity based on elastic - acoustic approximation, and the wavelet model computed by the method, wavelet creation with fourier transform, we proposed, in conjunction with vrselrf wavefield extrapolation operator

    第三,將頻率波數域穩定的變參考慢度rytov近似廣義屏波場延拓運算元( vrselrf )應用於疊前與疊后正演模擬、疊前與疊后深度偏移,對演算法應用中應注意的問題、適用范圍、性能等作了較為全面的論述;提出了基於vrselrf的單程聲波方程共炮記錄正演模擬和深度偏移快速演算法,並通過數值模擬試驗對演算法進行了驗證;簡要地討論了倏逝波的產生原因及其帶來的橫向振幅不連續性問題。
  14. The error analysis model of sampling system was set up for the first time, by combining the saddlepoint approximation analysis and numerical arithmetic, which greatly increased the potential of further application and improved the reliability of the error approximation of the optical sampling histogram

    論文首次建立了採用鞍點近似法與數值演算法相結合的取樣系統誤差分析模型,大大擴展了鞍點近似演算法的適用范圍,提高了誤碼率估算的可靠性。論文提出了基於時分取樣方法的光子模數轉換。
  15. ( 5 ) discuss some mathematical models of the pollutant transport problems in some local river flow fields. by integral transform method, the paper establishes the usual finite difference approximation scheme to solve the numerical solutions and gives examples for the computation of the approximating solutions, moreover, discusses one - dimensional characteristic finite difference method for a convection - diffusion equation under usual conditions

    ( 5 )針對水域中污染物輸移問題的數學模型,通過積分變換法,得到了簡化模型在理想化條件下的近似精確解,同時給出數值算例,並且對非理想化條件下模型的特徵差分方法進行了討論。
  16. Firstly, in the reproducing kernel space, the spline function is discussed and its equivalent relations are gived ; we prove that the 2 - th differential operator interpolation spline function in the space can be expressed not only by the reproducing kernels but also by polygonal functions. so it is easy to prove its best approximation properties in theory and is convenient for numerical calculation in applications, too

    首先,在再生核空間中討論樣條函數,給出其等價性條件;證明了空間中的一個二階微分運算元插值樣條既可由再生核函數表示又可由折線函數表示,這不僅在理論上便於獲得此種插值樣條函數的最佳逼近性質,而且在應用上也便於數值計算。
  17. In order to predict hydrodynamic characteristics a computational system is developed including determination of the pressure distribution on a wing section by use of the conformal mapping method and panel method respectively and of the flow in boundary layer according to the thin shear layer approximation ( tsl ) for navier - stokes equation approach. the wing sections of naca4412 and naca0012 are applied to test the computational system. the numerical inspection shows that the panel method with better precision and the momentum and the displacement thickness of boundary layer can be used to complete this calculation

    本文分別用守屋的保角變換法和基於源匯渦分佈的面元法,建立了計算槳葉表面壓力分佈的數學模型;應用納維-斯托克方程的薄層近似理論模式和有限差分數值方法,建立了計算機翼表面邊界層內部流動的數學模型;應用槳葉表面邊界層內部粘性流動和外部勢流流動在邊界上的匹配演算法,建立了槳葉表面二相流流動的計算方法和相應的計算機程序。
  18. The stress - strain distributions and deformation characteristics of forming process are calculated and analyzed by the successive approximation numerical method based on the incremental strain theory

    基於增量理論的逐步逼近數值法,計算分析了成形過程應力應變分佈與變形特點。
  19. The author ' s work gives new way, which is beneficial to real time interaction and can efficiently reduce computing time as well as data storage amount. these algorithms can find good use in numerical machining, robotics, form - position tolerance and computer graphics. ( 3 ) degree reduction for nurbs curves and surfaces by applying the theory of the best uniform approximation of chebyshev polynomials and the explicit matrix representation of nurbs curves, this thesis centers on the research of the explicit nearly best approximation of multi - degree reduction of nurbs curves

    以上關于等距曲線的幾何逼近與代數逼近的演算法改革了當前國際圖形界只能對基曲線沿法矢方向平移定距離的點作近似逼近的固定模式,創造了利於交互操作,能有效地減少計算量及數據存儲量的新方法,可在數控加工、浙江大學碩士學位論文機器人、形位公差學、計算機圖形學中獲得很好的應用( 3 ) nurbs曲線曲面降階應用nurbs曲線的顯式矩陣表示及chebyshev多項式逼近理論,以實現nurbs曲線顯式一次性降多階的近似最佳逼近為目標進行了研究
  20. An optimal hankel norm approximation model reduction method is used to reduce the equations of motion to lower order size. it is shown that the method is steady, efficient by numerical emulating. firstly, the influence of viscoelastic layer thickness and material properties, piezoelectric actuator layers thickness on the vibration suppression are investigated

    採用最優hankel最小階逼近降階法對主被動混合阻尼結構的控制狀態方程進行降階,以附加主動約束阻尼層的梁結構為例,進行了數值模擬,結果表明:該方法是一種穩定的、高效的、魯棒性很好的降階方法。
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