例句與造句

1. In rotating frame of reference , the construction method of three dimensional finite volume tvd schemes is systemically analyzed , in which implicit euler defiference is applied for time discretization
   在旋轉坐標系下，發(fā)展了一種含旋轉源項的雷諾平均navier - stokes方程的三維有限體積tvd格式，時間離散采用隱式euler方法。
2. 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。
3. In this paper , we analyzed and discussed the basic principle of the recently developed high order accuracy finite difference schemes ? eno schemes and weno schemes . based on 2nd order nnd schemes , we introduced a 3rd order wnnd scheme with jiang and shu ' s " weighted " idea and a tvd runge - kutta time discretization method
   對于新近發(fā)展起來的eno格式和weno格式，本文分析并討論了其基本構造原理，并且在二階nnd格式的基礎上，利用jiang和shu的加權思想和具有tvd性質的runge - kutta時間離散方法，建立了時、空三階精度的wnnd格式。
4. 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離散方法應用于非定常的熱傳導-對流問題的空間離散的galerkin混合元近似。
5. The conformal microstrip antenna with some unique character has been applied in many fields , especialy on speedy objects . in this paper , an efficient fdtd algorithm is introduced to analyse the microstrip antenna . firstly , the fdtd formula in descartes coordinate system and in cylindrical coordinate system are obtained from the time _ dependent maxwell equations using the yee algorithm in a calculating region where the dielectric parameters are independent of time and space . the choice of the space discretization units and the time discretization interval are discussed which are decided by the accuracy and stability respectively . the shape and setup of the excitation source are discussed too . the excitation source is chosen to be gaussian pulse in shape . secondly , the mur ' s first - order and second - order boundary condition are deduced in cylindrical coordinate system . the methods of transforming radiation fields from near zone to far zone in the frequency domain and in the time domain are presented when fdtd is applied to analyse the characteristics of far zone . finally , three kinds of microstrip antennas are analysed . they are a slot antenna that lies on a plane ground of a microstrip , a slot antenna that lies on a cylindrical ground of a microstrip and a microstrip line _ fed aperture coupled stacked rectangular patch antenna in cylindrical coordinate system
   本文從麥克斯韋旋度方程出發(fā)，建立了笛卡兒坐標下無源空間中均勻無耗媒質的fdtd基本方程和圓柱坐標下無源空間中均勻無耗媒質的fdtd基本方程，詳細討論了fdtd法計算中時間步長和空間步長的選取原則以及激勵源的類型和設置；推導了mur一階和二階邊界條件在圓柱坐標下的差分格式；給出了在用fdtd法計算天線的遠場輻射特性時必需采用的頻域和時域近場遠場變換技術；最后用fdtd法計算了平面微帶縫隙天線、柱面共形微帶縫隙天線和柱面共形微帶層疊天線的輸入阻抗和遠區(qū)輻射場，并分析了天線的一些參數的變化對天線輸入阻抗的影響，得出了一些有用的結論。
6. It's difficult to find time discretization in a sentence. 用time discretization造句挺難的