variational method 中文意思是什麼
variational method
解釋
變分法- variational : 變化的
- method : n 1 方法，方式；順序。2 （思想、言談上的）條理，規律，秩序。3 【生物學】分類法。4 〈M 〉【戲劇】...
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Firstly, second harmonic component ratio and dead angles of two phase inrush ' s dispersion in three - phase transformes are acted as input variable. secondly, the method applies improved algorithm based on the original algorithm of multi - layer forward back propagation network, that is to say, adding last variational effect of weight value and bias value to this time and making use of variable learning rate. at the same time, this method also adopts dynamic form in the number of hidden floor node
首先，文中將三相變壓器兩相涌流差流的二次諧波含量比和間斷角作為網路的輸入變量；其次，利用對原有bp網路訓練演算法基礎上的改進型演算法（即在計算本次權值和閾值的變化時增加上一次權值和閾值變化的影響以及採用變學習率，與此同時隱含層神經元個數採用動態形式） ，通過樣本訓練使網路結構模型達到最優。 -
Since the variational method is useful for determining characteristic quantities such as resonant frequency and impedance, it is mainly used in this thesis
變分法在確定諸如諧振頻率和阻抗等特徵量方面非常有效，因而本文主要採用了變分法。 -
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 -
4. the algorithm solving an optimal control problem governed by a semilinear parabolic equation with the control in the coefficients and source term is studied. the strong variational method which presented by mayne to solve the optimal control of lump parameter system is developed to semilinear parabolic optimal control problem
4 、把由mayne等所提出的用於求解集中參數系統最優控制的強變分法，推廣應用於一類控制變量含于高階導數項系數與源項中半線性拋物型系統最優控制之中。 -
Using the variational method, analytical conditions for stationary pulse propagation in dense period fibers with strong dispersion management are deduced. the expression of initial soliton peak power is given. by employing the obtained formulas, the soliton evolution semi - analytically in various dispersion maps can be investigated. effects of the third order dispersion are also studied in this paper. the results show that imperfect dispersion slope compensation can cause pulse central position shift and even serious degradation of soliton shape
利用變分方法，推導出了在強色散管理的密集周期光纖中脈沖穩態傳輸的解析條件，並給出了初始脈沖峰值功率的表達式.運用這些公式，對各種色散管理系統中孤子的演化進行了半解析的考察.三階色散也被考慮在內.結果表明:不完善的色散斜率補償將導致脈沖中心位置的偏移甚至嚴重的孤子形狀劣化 -
The amplitude fluctuation and according system performance degradation induced by xpm is also studied through numerical simulation. the timing jitter caused by xpm can also have great impact on system performance. by employing lagrangian variational method and statistical method, the timing jitter caused by xpm in strong dispersion managed rz systems is studied in chapter 3
通過模擬也研究了波分復用系統中由於交叉相位調制效應引起的幅度抖動從而導致系統性能的惡化；交叉相位調制引起的時間抖動對系統性能也有較大影響，利用拉格朗日變分方法和統計分析的方法，第三章討論了強色散管理歸零碼系統中交叉相位調制引起的時間抖動。 -
The discrete variational method ( dvm ) for clusters ( dft in real space ) is described in detail. the basis functions, numerical grids utilized and potential are discussed
重點介紹離散變分方法（ dvm ） ，討論基函數的構成、離散點的分佈、勢的構造。 -
Schrodinger equation, bound states, hydrogen atoms, wave packets and uncertainty relations, wkb approximation, principle of quantum mechanis, perturbation theory, variational method, spin and angular momentum, scattering theory
薛丁格方程、束縛態、氫原子、波包及測不準原理、 wkb近似、量子力學的原理、微擾論、變方法、自旋與角動量、散射論。 -
The application of the variational method in a finite orthotropic plate with edge crack
變分法在含邊裂紋正交各向異性板中的應用 -
In the first part, the scaling rule for the hydrogenic impurity binding energy and the virial theorem value ( potential - to kinetic - energy ) in infinite quantum wells and quantum wires of rectangular cross - section with three different aspect ratios are studied through the variational method
在第一部分，利用變分法計算了無限深gaas矩形量子線和量子阱中類氫雜質束縛能的度規法則和維里定理值。 -
Applying variational method we analyze the existence and uniqueness for the solution of the corresponding boundary variational equation, truncated mrm boundary variational equation, and approximation truncated mrm boundary variational equation in detailed. we obtain the error estimation for various approximation solutions and construct the boundary integral method with constraint. we explain the principle for choosing the mesh size and the truncated number in mrm. finally the numerical examples show that the theoretical analysis is accord with the numerical experiment result
採用變分方法系統分析了相應問題的邊界變分方程，截斷的mrm邊界變分方程與近似截斷mrm邊界變分方程解的存在唯一性，解釋了網格寬度與mrm方法中截斷數的選取原則，討論了mrm方法中的迭代誤差估計，給出了數值算例。 -
In this paper, the evolution equations of the parameters of the optical soliton pulses were derived by means of variational method, in order to investigate the influence of the fifth - order nonlinear effect on the transmission properties of optical soliton in the coupling fiber, and the effects of the fifth - order nonlinearity were discussed on amplitude, frequency band width, chirp, frequency, center position and phase
摘要運用變分法導出五階非線性作用下孤子的參數演化方程組，研究五階非線性耦合光纖中孤子的傳輸特性，討論五階非線性效應對孤子的振幅，頻寬，啁啾，頻率，中心位置及相位的影響。 -
First, with the variational method, the variational lower bounds of the characteristic impedance are respectively computed of the conformal coaxial lines with circular, regular polygonal and elliptical cross - sections. then the optimal variational lower bound of the conformal coaxial line with a square cross - section is obtained
本文首先用變分法求解了截面為圓形、正多邊形和橢圓形的共形同軸傳輸線的特性阻抗的變分下界，得到了截面為正多邊形的共形同軸傳輸線特性阻抗的變分最優下界。 -
The conclusion which, for a given non - extremal admissible control, another admissible control can be constructed such that the corresponding value of the objective functional decreases is proved, based on the result, an optimality condition is obtained and the strong variational method which solves optimal control problem is presented and the associated convergence result is proved also
證明了對任一非極值允許控制函數，均可構造另一允許控制函數，使最優控制問題相應的目標泛函值有一下降量。在此基礎上得到了最優控制問題最優性必要條件，並給出了求解該最優控制問題的強變分法及演算法的收斂性結果。 -
In this thesis, we study the nonlinear effects in electron - phonon interaction of one or quasi - one dimensional system with the nonlinearity of phonon ( lattice ). using the variational method and coherent method we study the ground state properties of one - dimensional molecular crystal and the soliton characteristics in protein molecular chain, respectively
本文以較簡單的一維（或準一維）電子-聲子耦合系統為對象，在計入聲子（晶格）非線性的條件下，分別採用變分法和量子相干態方法研究了一維分子晶體基態的性質和蛋白質分子鏈中孤立子特性。 -
Based on the theory of thin - walled curved bar, reasonable hypothesized a third - ord parabolic curve, the paper adoptes variational method on energy, taking the coupled relationship of the effect of curvature radius, bend, torsion and shear - lag into consideration, establishes the elastic governing differential equation and boundary conditions for thin - walled curved box girders, which set the foundation of theoretical analysis of shear - lag effect in thin - walled curved box girders
摘要文章以薄壁曲桿理論為基礎，合理地假設了三個剪力滯翹曲位移函數，應用能量變分法推導出考慮曲率半徑影響、彎、扭、剪力滯耦合的曲線箱梁彈性控制微分方程及其邊界條件，為薄壁大麴率箱梁剪滯效應建立了理論分析基礎。 -
The equilibrium condition for the cylindrical configuration in fluid membrane is re - examined in this paper, using the direct and the indirect variational method and taking account of possible influences of its topology
本文還研究了柱狀膜的靜力學方程。由於開口的柱狀膜的不穩定性，對柱狀膜的研究只能採取近似方法。 -
At first, according with the fundamental theory of complementary variational method, the complementary fem is constructed by the introduction of t - q to satisfy the equation of secondly
首先，根據互補變分原理，構造了基於t ?變量的互補有限元法，從而滿足了應用互補有限元法計算電磁參數時，必須保證基本關系式h = j恆成立這一前提。 -
Variational - effective index method and finite difference beam propagation method ( fd - bpm ) are both practicable waveguide simulation tools. the variational - effective index method is based on mixing the variational method ( vm ) and the effective index method ( eim ), it can be used with very accuracy to simulate the field distribution
變分有效折射率法是變分法（ vm ）和有效折射率法（ eim ）的結合，它能夠很精確地模擬光場分佈情況;有限差分束傳播法則能夠準確地模擬波導的性能。 -
Based on the given linear holstein model, and using the variational method we obtained the ground state properties of the electron - phonon interaction system with cubic and quartic lattice ( phonon ) terms. we obtained the relations between the ground state energy and the phonon squeezing effect and polaron squeezing effect as well as the variation of the polaron bandwidth
在線性holstein模型的基礎上，採用變分法得出了含晶格（聲子）三次方和四次方勢下系統基態特性，得到了基態能量與聲子壓縮效應和極化子壓縮效應的關系，並求得了極化子能帶寬度的變化規律。
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