second approximation 中文意思是什麼

second approximation 解釋
第二近似值
  • 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...
  • approximation : n. 1. 接近；近似。2. 【數學】近似值。3. 概算，略計。
  1. 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
  2. The dissertation proposes originally the idea of decomposing the time - variant load to solve this problem. first, the time - variant load is decomposed into the time - variant load characteristic and the time - variant load model due to the modeling method. second, the multi - curve approximation method is proposed to identify the load parameters, which to a great extent, reduces the effects on the time - variation of the load model from modeling method

    針對負荷的時變性，論文首次提出了將負荷時變性分解的思想，首先將負荷的時變性分解為負荷特性的時變性和由建模方法引起的負荷模型的時變性，然後提出了多曲線擬合參數辨識方法，很大程度上消除了建模方法引起的負荷模型的時變性。
  3. The relativistic random phase approximation ( rrpa ) is a relativistic extension of the random phase approximation for studying microscopically nuclear dynamical excitations and giant resonances. the consistency of rrpa calculations requires two aspects : first, it demands that the relativistic mean - field wave " function of nucleus and the particle - hole residual interactions in the rrpa are calculated in a same effective lagrangian. second, the consistent treatment of rrpa within rmf approximation requires the configurations including not only the pairs formed from the occupied fermi states and unoccupied stat es but also the pairs formed from the dirac states and occupied fermi states

    自洽的相對論無規位相近似理論的自洽性要求有兩方面的內容：第一，描述原子核的激發態性質和基態性質時必須從同一個有效的拉矢量出發；第二，相對論無規位相近似計算，不但要考慮正能的粒子-空穴組態的貢獻，而且還要考慮從fermi海核子態到dirac海負能核子態形成的對激發的貢獻。
  4. Second part, using approximation method and implicit function theorem, we obtain the existence of large amplitude 2 - periodic bouncing for damped linear impact osillator with mutiple impacts in one period

    在第二部分里，我們運用逼近框架與隱函數定理，對于帶小阻尼的線性碰撞振子，證明了在一周期內發生多次碰撞的大振幅2 -周期解的存在性。
  5. 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。
  6. In the second part, the deduced self - energy in 63 theory is derived at hard thermal loop approximation. then we calculate the effective mass and damping rate, and also show that there is thermal instability above a critical temperature tc

    在此基礎上，出自能實部和虛部與一些介質效應的對應關系式，進而求得了粒子的有效質量和衰變率，並討論了_ 6 ~ 3理論的熱不穩定性。
  7. In the first part, the simultaneous approximation of this kind of operators is studied ; in the second part the approximation in c [ 0, ) of their linear combination is discussed. absorbing the method of paper [ 20 ], the inverse theorem of a new kind of linear combination operators is obtained in the third part

    第一節研究這類運算元的同時逼近；第二節討論該運算元線性組合在c _ [ 0 ， ）上的逼近；第三節吸收[ 20 ]的思想，得到了該運算元線性組合逼近的逆定理；第四節討論該線性組合運算元在c _ [ 0 ， ）逼近的飽和定理。
  8. The second part has summarized from the one - dimension and multivariate respects the abundant approximation properties of bernstein polynomials, mainly including the estimation of approximation degree, derivative approximation, linear combination approximation and weighted approximation

    第二部分從一元和多元兩個方面系統總結了bernstein運算元豐富的逼近性質，主要包括逼近度估計、導數逼近、線性組合逼近和加權逼近等
  9. In the second chapter, the approximation theories of modified baskakov - beta operators are investigated

    第二章研究修正的baskakov ? beta運算元的逼近定理。
  10. 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
  11. 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。
  12. The second aspect : in zm model, under mean field approximation, the zero - point energy of vaccum is often neglected

    第二個方面，在zmng中，在平均場近似下，真空零點能往往是被忽略的
  13. If a computer is used, a second approximation can be made with little trouble.

    如果使用計算機，則可以毫不費事地計算第二次趨近。
  14. Abstract : the second scalar analysis method to calculate the di ffraction efficiency of grating was described in detail, a simple effective approximation formula to calculate the diffraction efficiency of grating was educed. diffraction efficiencies were given and compared with scalar results, rigorous vector results

    文摘:詳細介紹了計算光柵衍射效率的二階標量近似法，推導出一種簡單有效的計算光柵衍射效率的近似公式.給出了利用近似公式對幾種情況下光柵衍射效率的計算結果，並與普通標量法、嚴格矢量法的計算結果進行了比較
  15. 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。
  16. Combining with practical investigation and analysis, the author presented the fitting equation of the second non - uniform coefficient in which the method of least squares error approximation with the power index regression is used and proposed a modified formula for flow rate per second calculation to precisely determine the size of pipeline and to make the design advanced in technology and reasonable cost

    本課題分析了室外和室內的設計流量公式，通過調查、實測本地區的水量資料，運用相關數學方法分析，提出了適合小區給水管網採用的流量公式。
  17. The general idea behind the second one is approximation. the control mesh is subdivided until the error between the control vertices and corresponding subdivision surface is less than a given threshold. then the vertices substitute those points on the surface approximately. the last step is to calculate offset point for every vertex and connect them to form an offset surface

    第二種演算法採用逼近思想，首先通過對控制網格進行細分，當控制頂點和細分曲面的距離滿足一定誤差要求時，近似用控制頂點代替細分曲面上的點，然後對各個頂點分別求等距點。
  18. 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。
  19. For light particles, 1 when observed within the whole water depth. the relationship between theoretical and measured values of the suspension falls to the second approximation to the solution of the diffusion theory

    輕質顆粒在整個水深內有pzi ，懸浮指標實測值和理論值之間的關系符合擴散理論的第二近似解。
  20. Dual mathematical programming is used to map the original problem exactly and the second approximation of the dual problem is set up by taylor ' s expand form, it is solved by qp ( quadratic programming ) solving device

    用對偶數學規劃精確映射原問題，用泰勒展式建立對偶問題的二階近似。最後用二次規劃求解器求解。
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