approximation 中文意思是什麼

音標 [əˌprɔksi'meiʃən]
approximation 解釋
n. 名詞 1. 接近；近似。
2. 【數學】近似值。
3. 概算，略計。

  1. The adequacy of this approximation is considered later.

    這種近似方法的適用性將在後面再討論。
  2. Abstract : considering the second nearest - neighbor interaction and cubic, quartic anharmonic interactions simultaneously, we employ the multiple scales method combined with a quasidiscreteness approximation to calculate the lattice vibration. it is shown that the kind of nonlinear chain exhibits envelope soliton, envelope kink and envelope antikink soliton. these results can also be used to explain the experimental phenomena that the kink amplitude of the self - localized structure is determined only by the intrinsic properties of its lattices

    文摘:同時考慮次近鄰諧振相互作用和三次方、四次方非諧相互作用，利用多重尺度結合準離散近似方法去計算晶格振動行為，發現一維非線性點陣中存在包絡孤子及正扭結型包絡孤子、反扭結型包絡孤子，解釋了自局域結構的幅度只取決于點陣中的固有參數的實驗現象
  3. This approximation has been discussed earlier.

    這個假定以前討論過。
  4. Its derivation involved no approximation.

    它的推導過程不含近似處理。
  5. Thus planck's law can be used as a good approximation.

    因而布朗克定律可以作為一個較好的近似計算。
  6. The jellium model in a certain approximation leads to the equation.

    凝膠模型在某種近似下導致下列方程。
  7. To a very good approximation the total energy is conserved.

    作為一個非常好的近似，這里的總能量是守恆的。
  8. This type of approximation is made at a finite number of points.

    這種近似法是在有限數目的節點處來進行的。
  9. As an approximation he should understand enough computer programming.

    他大體上要弄懂足夠的計算機程序編制。
  10. There has been many papers to discuss the in - medium quark and gluon condensates in nuclear matter which use the models with su ( 2 ) l su ( 2 ) r sym - metry. now, we make use of the chiral model su ( 3 ) l su ( 3 ) n including the baryon octet to discuss the quark condensate < qq > in strange matter, where q is an up or down quark field. on the one hand, from the experimetal data, it is found that < qq > vac = - ( 225 25mev ) 3, on the other hand, with the hellmann - feynman theorem, quark condensate can be evaluated on the hadronic level. in this paper, we will investigate the quark condensate in strange matter with the chiral symmetry su ( 3 ) l x su ( 3 ) rspontaneous breaking lagrangian to obtain the variation of the quark condensate in the strange matter when the baryon number change. it can be applied to understand the neutron stars when the neutron star are considered to be constructed by the strange matter. because nertron stars are homogeneous and at very low temperature, we will use the mean - field approximation and zero temperature throughout this paper

    鑒于已有大量文獻討論了核物質中的夸克凝聚，本文將討論在奇異物質中的夸克凝聚。而在介質中的夸克凝聚的基本公式可由hellmann - feynman理論導出，所以運用手征對稱自發破缺拉氏量以及平均場近似，我們就可以討論在奇異物質中的夸克凝聚，由所計算的結果表明： （ 1 ）奇異物質中的夸克凝聚隨奇異物質密度的增大而單調減小。 （ 2 ） -凝聚的出現對衰減率有影響。
  11. Approximation properties for modified bernstein operators on simplex

    運算元的逼近性質
  12. Simultaneous approximation by modified bernstein - durrmeyer operators

    運算元的同時逼近
  13. Approximation by linear combinations of bernstein - durrmeyer operators

    運算元線性組合的逼近
  14. The approximation of the parabolic integro - differential equations is studied with anisotropic biquadratic finite element

    摘要研究具有各向異性特徵的雙二次元對拋物積分微分方程進行了逼近。
  15. Its biquadratic finite element approximation is considered and under the appropriately graded meshes, quasi - optimal order error estimates in the - weighted h ^ 1 - norm, up to a logarithmic factor in the singular perturbation parameter, are proved

    然後，考慮此方程在分層網格剖分上的雙二次有限元逼近，在-加權h ^ 1 -模意義下得到了至多相差一個關于攝動參數對數因子的擬最優階收斂的誤差估計。
  16. By the polygonal approximation method, a global approximation solution is constructed for the initial - boundary value problem of nonconvex scalar conservation laws with two - side boundary effect, and its convergence to the global weak entropy solution of the corresponding problem is proved

    摘要使用折線逼近法，對具有兩條邊界影響的非凸單個守恆律初邊值問題構造了整體近似解，並證明其收斂到初邊值問題的整體弱熵解。
  17. 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。
  18. The approximation analysis result of band dipole model is obtained on the basis of the theory of mfl. the electromagnetic distribution feature of the defect in the steel panel is studied by means of simulation. the leakage magnetic distribution of the two defects and four defects plural and the defects in the column differently in the width are also assayed. conclusions that factors affecting flaw magnetic leakage to the panel also affect the column and magnetic leakage bx should be the feature of the flaw identification to several flaws are drawn

    在對漏磁檢測原理進行詳細介紹的基礎上，得出了帶偶極子模型的近似解析解，並以有限元數值模擬分析為主要手段，以鋼板上缺陷為對象，分析了各因素對缺陷漏磁場產生影響的不同規律，同時模擬分析了板上平行的兩條裂紋，四條裂紋以及柱體上寬度不同時的裂紋的漏磁場分佈特徵，得出結論:影響板上缺陷漏磁場的諸因素會對柱體上缺陷漏磁場產生同樣的影響;對于多條裂紋，宜用漏磁分量bx作為缺陷識別的特徵量。
  19. The first approximation would make everything depend on the capitalized money value of the individual's prospective receipts.

    第一種近似意義是以個人預期進款的資本化的貨幣價值為其中心。
  20. The meaning of the central-field approximation can be clarified by thinking about the solar system.

    考慮一下太陽系，人們就能弄清中心場近似值的意義。
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