variational formula 中文意思是什麼

variational formula 解釋
變分公式
  • variational : 變化的
  • formula : n （pl formulas lae ）1 公式，程式；定則，方案。2 【醫學】配方，處方。3 （政治口號等的）提法，表...
  1. A new waveguide made of changing a wide wall of a rectangular waveguide to a uniform curved wall is called conformal waveguide. a kind of expression of approximate solution for domain mode of the new waveguide, including symmetric, unsymmetric arc, parabolic arch, hyperbolic arch, elliptic arch, etc., is constructed by using boundary condition of mental waveguide, variational method and boundary element method. by using the equivalence principle, an approximate calculating formula for equivalent resonant conductance of a narrow longitudinal halfwavelength slot cut in the curved wall of the unsymmetric arcrectangular waveguide is derived, and the result is shown. although this solution is approximate, it can solve the problem in designing the slotted antenna of such conformal waveguide

    把矩形波導一個寬面外突成均勻曲面構成的新波導統稱為共形波導.利用金屬波導邊界條件、變分法、邊界元素法構造這種新波導中主模場的一種近似解表達式，包括曲面橫截線為對稱、非對稱圓弧，拋物線弧，雙曲線弧，橢圓弧等.然後根據等效原理，推導非對稱圓弧矩形波導曲面上窄的縱向半波長縫隙的等效諧振電導的近似計算公式，給出計算曲線.這種解雖然是近似的，但卻能解決這類共形波導縫隙天線的工程設計
  2. Among the adaptive beam - forming algorithms, the least mean square algorithm is widely used because it has a simple configuration and it is apt to come true and have nice convergence. on the other hand, it has a disadvantage that it converges slowly and there is a conflict between the fixed step and the convergence pace or the error in stabilization. so people have developed many improved least mean square algorithms which generally start from convergence, stabilization, misadjustment, and robustness and come to a formula about variational step in the end

    在自適應波束形成演算法中，最小均方（ lms ）演算法因結構簡單，易於實現，能穩定收斂而得到廣泛應用，但它也存在收斂速度受限的缺點：固定步長因子無法解決收斂速度和穩態誤差之間的矛盾。因此，人們提出了各種改進的最小均法演算法來解決這一問題。改進的最小均方演算法通常從如何改進收斂速度、穩態誤差、失調量和魯棒性等指標上出發，最後在新演算法最終表達式中的步長公式上變化。
  3. Using techniques of resolvent formula of - subdifferential operators and auxiliary principle, we presented the existence and uniqueness of the solution of a class of variational inequalities

    運用-次微分運算元的預解式技術和輔助原理技術給出了?類似變分不等式問題解的存在性和唯一性。
  4. Directed against the characteristic of variational high box - girder structural force, and numerical analysis of to be built bridge, taking into account construction stabilization and intension, the thesis putts forward optimal formula constructional range of isotropic box - girder thick, girder highness and underside bridge curve

    針對變高度箱梁的結構受力特點，結合實橋資料的數值分析，考慮結構穩定及強度的影響，給出了各向同性箱梁板厚、箱梁梁高和梁底曲線的優化設計公式及構造范圍。
  5. A variational formula combining mixed finite element method with discontinuous finite element method is derived for solving the two - group neutron diffusion equation in 2d

    摘要構造了求解二維兩群中子擴散方程的混合間斷有限元格式，研製了相應的計算程序。
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