second-order error 中文意思是什麼
second-order error
解釋
二次誤差-
Presents a new method for fairing of curves which has a small flexibility based on fitting the derivative of second order of curves. we fit the derivative of second order of curves by a polynomial fitting, then find an indefinite integral of this polynomial to get a approach of curves. otherwise, we discuss the analyze of the error and the optimize of fairing to this arithmetic
提出了一種針對小撓度曲線的逆向曲線光順演算法，該演算法直接擬合曲線型值點列的二階導數曲線，然後通過兩次積分來反求出光順后的曲線，並對該演算法的誤差分析、效果分析、光順優化等問題進行了深入探討。 -
In this paper, a crank - nicolson mixed element method, a nonlinear galerkin mixed element method for the non stationary conduction - convection problems time second order accuracy fully discrete formats and a two - level mixed element method with backtracing for the stationary conduction - convection problems are presented and analyed, respectively, an error analysis are provided for the crank - nicolson method of time discretization applied to spatially discrete galerkin mixed element approximations of the nonstationary conduction - convection problems
本文分別給出了非定常的熱傳導-對流問題的crank - nicolson混合元法時間二階精度全離散格式，非線性galerkin混合元法時間二階精度全離散格式以及定常的熱傳導-對流問題回溯二重水平法。討論了時間上的crank - nicolson離散方法應用於非定常的熱傳導-對流問題的空間離散的galerkin混合元近似。 -
In this paper, we expand eigenvalue of poisson equation using bilinear element, by the formulation of the error expanition, we can conclude that it is a upper bound. and by two numerical example, we computer the approximate eigenvalue of poisson equation in square and l - shape domains, then we analyses the approximate eigenvalue. we also extraplate the error expansion and enhance the accuracy of the eigenvalue form the second order to the forth order
本論文對poisson方程的特徵值採用雙線性元進行展開，得到了誤差展開式，通過誤差展開式，我們能得到特徵值是上界。通過數值算例，計算方形與l形區域上的poisson方程的近似特徵值，並對數據進行分析，驗證了理論的正確性，然後通過對誤差展開式外推，收斂級數可以從二階提高到四階，得到了高精度的解。 -
Results : when time duration estimation was done on the two levels of second and minute during online, network - addiction group showed more errors than non - network - addiction group, and time estimated by network - addiction group was shorter than real time duration ; the larger time estimation error is, the better network - addiction group can make time order judgment ; the time memory characters of network - addiction group were different between the two levels of second and minute
結果：大學生網癮者在網際網路使用條件下，進行秒級時間單位和分級時間單位的時距估計時，誤差值普遍要大於非網癮者，且明顯表現出低估現象；大學生網癮者時間估計誤差值越大，時序判斷越準確；大學生網癮者時間估計在秒和分兩級單位上的時間記憶特點不同。 -
Iv ) constructing of a kind of approximate integration conservative remapping algorithm. through analyzing a second order sign - preserving conservative remapping method, two conservative remapping algorithms have been constructed by using the reconstruction method to take the place of the positivity - preserving error compensation algorithm
（ 4 ）近似積分守恆重映方法構造：在分析了二階保號守恆重映方法的基礎上，通過重構的方法代替原演算法中的誤差補償方法，構造了兩個守恆重映方法。 -
In this paper, a class of the second order accurate explicit gauss schemes with staggered grids for the computation of solutions of hyperbolic conservation laws are presented, the advantages of these schemes are : riemann solver - free, faster and programming is much simple, no complete set of eigenvectors is needed and hence weakly hyperbolic system can be solved. in one dimensional case, these schemes are and total variation diminishing and convergence under the restriction of cfl condition, the convergence rate is the first order, and a pointwise error bound is presented
本文在交錯網格的情況下，利用gauss型求積公式構造了一類求解雙曲守恆律的時空一致二階顯式gauss型差分格式，這類gauss型差分格式，具有不需要求解riemann問題、計算簡單、工作量少、編程簡便等優美特點，而且由於這類格式在應用於求解方程組的時候，不需要對方程組進行特徵分解，因此可應用於求解非嚴格的雙曲守恆律方程組。 -
We expand the eigenvalue of possion equation using wilson nonconforming element. by the formulation of the error expanition, we can not conclude whether it is a upper bound or a lowr bound. but we guess it is a lower bound, and by two numerical example, we find thatwe are right. we also extraplate the error expansion and enhance the accuracy of the eigenvalue from second order to third order
通過數值算例，計算方行與l行區域上的poisson方程的近似特徵值，並對數據進行分析，驗證了我們的推測是正確的，然後通過對誤差展開式外推，收斂階數可以從二階提高到三階，得到了高精度的解。 -
The anisotropic property of the generalized difference methods has not been studied until now. in this paper, the anisotropic property of a kind of generalized difference methods is analy - sized and its error estimate is obtained without the limitation of regularity. finally, the numerical examples show that the theoretic analysis is right. in addition, based on the 2 - dimensional quasi - wilson element, the quasi - wilson element in the 3 - dimensional space with application to second - order porblem is presented. lt is proved that it is convergent for arbitrary hexahedron regular subdivision in 3 - dimensional space, and its error estimate is obtained
本文結合各向異性有限元的研究成果，對基於矩形剖分的一類廣義差分法進行了各向異性分析，給出了與剖分的正則性無關的收斂階估計，並進行了數值試驗，表明這類廣義差分法具有各向異性特徵，可以用於窄邊問題的計算。 -
Using the first order and the second order derivative information of the network error function to the learning rate factor / / and the momentum factor ?, dynamic optimization of the learning rate factor / / and the momentum factor ? is obtained during the network training process, which efficiently speeds up the network learning rate
並利用網路誤差函數對訓練速率系數和沖量系數的一階和二階導數信息，在網路訓練過程中動態優化調整訓練速率系數和沖量系數，有效地加快了網路的訓練速度。 -
After an error analysis is made in detail for second - order equations and some essential points of genetic algorithm in fault diagnosis are also illustrated, an improved genetic algorithm is adopted to choose an optimal test frequency
本文對二階靈敏度故障診斷方程進行了詳盡的誤差分析，同時在詳細闡述了故障診斷應用中的遺傳演算法操作要點后，使用改進遺傳演算法來選擇優化的測試頻率。 -
Solutions are advanced in time by explicit four - stage runge - kutta integration with up to second - order temporal accuracy. to avoid grid motion induced error, the geometric conservation law ( gcl ) is satisfied numerically
為避免網格運動給數值解帶來額外誤差，給出了幾何守恆律的離散形式並在數值上滿足了幾何守恆律條件。 -
According to the mathematic modeling principle of physical problem, the error of lattice boltzmann model is analyzed in chapter 3. the nonlinear deviation term from the navier - stokes equation is given, and the main model coefficients, such as speed of sound, viscosity and so on, are verified by numerical computation, the results show that the lattice boltzmann method has second order precision in space and in time which satisfy the engineering application, whereas, the compressible effect ca n ' t be neglected along with mach number increasing, and must be reduced or eliminated
其次，按照物理問題數學建模的原則，對格子法的誤差進行了分析，給出了格子bgk方程再現navier - stokes方程時的壓縮誤差項，並數值驗證了格子模型的聲速及粘性系數等相關參數的精度，表明格子模型盡管具有時空二階精度，能滿足工程計算的要求，但隨著mach數增大，壓縮誤差逐漸成為主要誤差，必須予以消除。 -
In nine - points controller control system, it utilizes k _ ( 0 ) control force achieving the static error requirement. the condition of ko = 0 could fit the second order in most control environments
對于模型不明確的系統，我們可以同意設置k0 = 0 ，利用此時的k _ 3控製作用，把穩態誤差限制在誤差零帶的范圍內。 -
Abstract : in this paper, the authors study the initial value problems of a class of weakly nonlinear differential equation. the first and the second order approximate solutions are obtained. their accuracies are high and the more the approximate order is high, the more the accuracy is high. if the regular perturbation method is used to solve the same problems, then, when the independent variable is big, so is the error of the solution
文摘:用插值攝動法1研究一類弱非線性常微分方程的初值問題，得到了一級及二級近似解.解的精度很高，並逐級提高.如果用正則攝動法求解此類問題，則當自變量較大時，誤差很大 -
And then the stability and the stable error response of the dpll are analyzed. there is an obvious doppler shift frequency offset in the received signal with flight at a high speed, in the dissertation the uniform sampling second - order dpll is used to remove the frequency bias for its excellent high - pass characteristic of the error transfer function
由於高速飛行的遙測目標在接收信號中會出現較大的多普勒頻率分量，而典型均勻采樣二階數字鎖相環dpll （ digitalphase - lockedloop ）的誤差函數具有高通特性，所以本文提出一種利用其高通特性來去除多普勒頻率分量的新方法。 -
The performance of the differential mode loop, the characteristic of mrc combining and the high - pass characteristic of the error transfer function of the uniform sampling second - order dpll are simulated in the matlab, the simulation results are given
在matlab環境下對分集合併中的差模環特性、最大比合併特性以及均勻采樣二階數字鎖相環誤差函數高通特性進行了模擬，給出了模擬結果。
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