second-order approximation 中文意思是什麼

second-order approximation 解釋
二階近似
  • second : adj 1 第二的；第二次的；二等（的）。2 次等的；較差的；劣於…的 （to）。3 〈美國〉較年輕的。4 另一...
  • order : n 1 次序，順序；整齊；（社會）秩序，治安；狀況，常態；健康狀態；條理；會場秩序；議事程序，日程；...
  • approximation : n. 1. 接近；近似。2. 【數學】近似值。3. 概算，略計。
  1. In soft - photon approximation, the average excitation energy only appears in the first and second order terms of field frequency

    在軟光子近似下，平均激發能僅出現在光場頻率的一階和二階項上。
  2. In this paper, we use the coupled fixed point theorem for mixed monotone condensing operators to obtain an existence, uniqueness and iterative approximation theorem of solutions of initial value problems for second order mixed monotone type of impulsive differential equations

    利用混合單調凝聚運算元的耦合不動點定理，給出了二階混合單調型脈沖微分方程的初值問題的解的存在唯一性及迭代逼近定理
  3. Absorbing the idea of the reference [ 3 ] and based on paper [ 2 ], the approximation theories of the global and pointwise of r + s order derivatives are obtained in the first part ; in the second part, the inequality of stechkin - marchaud type of generalized baskakov is studied

    第一節吸收[ 3 ]的思想，在[ 2 ]的基礎上得到了廣義baskakov運算元r + s階導數的點態和整體的逼近定理；第二節研究了廣義baskakov運算元的stechkin ? marchaud型不等式。
  4. Through extrapolation, the order is poromted from 2 to 4. for rannacher - turek element, its single root also gives lower - bound approximation. however, it can reach fourth order and further extrapolation leads to sixth order, while its repeted root has only second order precision and extrapolation leads to fourth order precision

    實驗結果表明拓廣rannacher - turek元確實給出特徵值的下逼近，並且要優于線性元，外推可以使2階精度提高到4階，而rannacher - turek元對單根同樣給出下逼近，但近似解本身便可達到4階高精度，外推可以獲得更高階（ 6階）精度，重根卻給出上逼近，只具有2階精度，但可以通過外推達到4階精度。
  5. The second aspect : from qgp kinetic equations with collision integrals, by using the relaxation time approximation, we calculate the distribution functions to the second order correction. we obtain the distribution functions for quarks ( and anti - quarks ) and gluons under perturbation of the fluctuation of the color field. then in the high - temperature - low - density area, we discuss the characteristics of the distribution functions, and use t hem to get the net baryon density and the energy density

    第二，從有碰撞項的qgp動力論方程出發，忽略自旋，在色漲落擾動下，利用弛豫時間近似，得到夸克和膠子分佈函數的二級修正，通過數值分析重點討論了高溫低密情況下qgp中成分粒子分佈函數的特性，並且由分佈函數得到凈重子數密度和能量密度。
  6. As is guessed, crouziex - raviart element gives lower - bound approximation with second order precision and further extrapolation reaches fourth order precision

    而crouziex - raviart非協調元則如預測，給出下逼近，具有2階精度，外推可以獲得4階精度。
  7. In this paper, the nonclassical properties of two two - level atoms interacting with a single mode light field is studied by means of the quantum theory without rotating wave approximation ; the influences of the yirtual photon process on the mean photon number, the degree of second order coherence of field, the evolution of the field entropy and the squeezing effect are also discussed

    本文利用全量子理論，研究了非旋波近似下「耦合雙原子-單模光場」相互作用過程中光場所表現出的非經典性質，研究了虛光子過程對場的平均光子數、二階相干度、場熵演化特性及光場壓縮效應的影響。
  8. On the basis of some conclusion, we have proved that the schemes have second - order convergence accuracy for the time discretization, a two - level method for resolving the nonlinearity in finite element approximation of the stationary conduction - convection problems is presented

    在某些已有結論的基礎之上，我們證明了這種格式對于時間離散上的二階精度。提出了一種解決定常的熱傳導-對流問題的有限元近似中出現的非線性問題的兩層方法。
  9. Uniform second - order pointwise convergence of a hybrid difference approximation for a singularly perturbed robin problem

    基於非均勻網格求解非線性對流擴散問題的一種高精度差分格式
  10. Based on the reynolds " lubrication approximation, the small parameter method is introduced to approximately analyze velocity field and stress distribution between the two parallel disks with an interstitial second - order fluid. 3. squeeze flow between two parallel plates of a bingham fluid with partial wall slip is considered

    以reynolds潤滑理論為基礎，採用小參數法研究了存在滑移時兩剛性圓盤間二階流體的擠壓流動，導出了流體的速度場和壓力分佈，進而求出圓盤間擠壓力的解析表達式。
  11. Based on the reynolds " lubrication approximation, and utilizing the small parameter method, the velocity and the pressure equations for two spheres translating normally and tangentially with an interstitial second - order fluid are derived for modeling wet granular assembles using the discrete element method. as a result, analytical solution for the tangential force and the torque were obtained

    採用reynolds潤滑理論和小參數法等研究了存在填隙二階流體時兩球法向及切向運動時的運動，位移及壓力分佈規律，從而求出擠壓力或切向阻力、阻力矩的解析解。
  12. The stress and local stability constraints are transformed into movable lower bounds of sizes. an inverse variable xt = ? is inducted, and the objective function is expanded as second order taylor approximation while the displacement constriction is expanded as first order taylor approximation. the lemke algorithm is used to get the final design result

    把復雜的應力約束和局部穩定約束轉化為動態尺寸約束，引入倒變量x _ i 1 / a _ i將目標函數展開為二階近似，將位移約束用莫爾積分化為一階近似，用對偶規劃方法將原問題化為等價的二次規劃問題，調用lemke演算法，求得最優設計結果。
  13. It is well known that the coupled interactions between the ship hull and the surrounding fluid field of explosion give rise great influence to both the fluid loadings over the structural wetted surface and the responses of the hull. jt is the coupling effect that provides the major difficulties in the underwater explosion induced dynamic responses of the ship structure. the second order doubly asymptotic approximation method ( dda2 ) has been commonly employed in the world to deal with the coupling effect

    本文針對daa方法不適合於分析敷有聲阻抗與水差不多的聲學材料（如玻璃鋼與消聲瓦）的船體結構與水下沖擊波相互作用的局限性，依據聲波的反射和透射原理對二階daa方法的高頻段進行了改進，發展並提出了能夠分析聲學材料流固相互作用的adaa方法（ acousticdaa ） ，拓展了應用范圍，使現有的二階daa方法成為它的一個特例。
  14. In this paper, we study the periodic solutions of the impact oscillator with damping. first part, using continuation lemma and approximation method, we prove the existence of 2 - periodic admissible solutions for a class of second order bouncing differencial equations with damping

    在第一部分里，我們運用延拓引理與逼近框架，對於一類帶阻尼的二階碰撞方程，證明了2 -周期碰撞允許（ admissible ）解的存在性。
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