直接數值法 的英文怎麼說

中文拼音 [zhíjiēshǔzhífǎ]
直接數值法 英文
direct numerical method
  • 直 : Ⅰ形容詞1 （成直線的; 硬挺的） straight; stiff 2 （跟地面垂直的; 從上到下的; 從前到后的） erect; v...
  • 接 : Ⅰ動詞1 （靠近;接觸） come into contact with; come close to 2 （連接; 使連接） connect; join; put ...
  • 數 : 數副詞（屢次） frequently; repeatedly
  • 法 : Ⅰ名詞1 （由國家制定或認可的行為規則的總稱） law 2 （方法; 方式） way; method; mode; means 3 （標...
  • 直接 : direct; immediate
  • 數值 : numerical value; numerial number; figure; magnitude; value數值表 numerical tabular; 數值天氣預報 ...
  1. Optimized association rules are permitted to contain uninstantiated attributes. the optimization procedure is to determine the instantiations such that some measures of the roles are maximized. this paper tries to maximize interest to find more interesting rules. on the other hand, the approach permits the optimized association rule to contain uninstantiated numeric attributes in both the antecedence and the consequence. a naive algorithm of finding such optimized rules can be got by a straightforward extension of the algorithm for only one numeric attribute. unfortunately, that results in a poor performance. a heuristic algorithm that finds the approximate optimal rules is proposed to improve the performance. the experiments with the synthetic data sets show the advantages of interest over confidence on finding interesting rules with two attributes. the experiments with real data set show the approximate linear scalability and good accuracy of the algorithm

    優化關聯規則允許在規則中包含未初始化的屬性.優化過程就是確定對這些屬性進行初始化，使得某些度量最大化.最大化興趣度因子用來發現更加有趣的規則;另一方面，允許優化規則在前提和結果中各包含一個未初始化的數值屬性.對那些處理一個數值屬性的演算法進行直接的擴展，可以得到一個發現這種優化規則的簡單演算法.然而這種方法的性能很差，因此，為了改善性能，提出一種啟發式方法，它發現的是近似最優的規則.在人造數據集上的實驗結果表明，當優化規則包含兩個數值屬性時，優化興趣度因子得到的規則比優化可信度得到的規則更有趣.在真實數據集上的實驗結果表明，該演算法具有近似線性的可擴展性和較好的精度
  2. The influence of the cloud droplet spectrum character and the spectrum growth and change is considered, which does not use a cut - off value for conversion from cloud water into rain water process. in the continuous coalescence equation, the particles fall velocity difference is not moved out from the integral, but is integrated in the equation as the function of diameter d to avoid the error of using particles average fall velocity. in the new scheme, generation rate of graupel due to the collection of snow by graupel and the collection of cloud ice by graupel are included

    雲中凝結核ccn的數濃度採用超幾何函數表示；雲水向雨水的自動轉換過程採用grabowski （ 1999 ）的公式，考慮了雲滴譜的特徵和發展變化對該過程的影響，而不是採用原方案給定閾值的方法描述該過程；對連續碰並方程不再將粒子落速差作為常量提出積分號外，而是直接作為粒子直徑函數在積分號內求解，這樣處理可以迴避使用粒子群的平均落速帶來的誤差；增加了霰和雪、霰和冰晶的碰並微物理過程。
  3. 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。
  4. To investigate the practicability of a solar - direct - pumped fiber laser by using a parabolic dish concentrator, the solar power absorbed by the fiber laser and its absorption efficiency were calculated with numerical method based on the characteristics of solar spectrum in outer space

    摘要為了研究拋物面碟形聚光器實現太陽能直接抽運光纖激光器，根據空間太陽光譜分佈特點，採用數值方法，計算了用該聚光器聚集太陽能量抽運雙包層光纖激光器時光纖吸收的太陽能量及其吸收效率。
  5. The equation including the nonlinear dispersion, i. e. the modified nonlinear schrodinger ( mnls ) equation, is a better model. in this thesis, we take mnls solitons as a model for femtosecond soltions. then based on the recently developed direct perturbation theory for perturbed mnls equation, we study the raman self - frequency shift of femtosecond solitons and its suppression by the means of frequency filters. for this purpose, first, we define the physical parameters of mnls solitons ; next, through the direct perturbation theory for perturbed mnls equation, under adiabatic approximation, we obtain the evolving parameters of mnls soliton on our questions and then choose the parameters of frequency filters based on it ; at last, we directly numerically simulated our questions by split - step fourier ( ssf ) method after improving the arithmetic of the differentiation of the nonlinear item for satisfying mnls equation

    本論文以mnls孤子作為光纖飛秒孤子的模型，通過新近建立的mnls孤子直接微擾理論，研究光纖中由拉曼效應引起的飛秒孤子在傳輸中的自頻移，以及通過頻率濾波對自頻移的抑制。為此，首先給出描述mnls孤子的各物理量，然後用mnls孤子直接微擾理論，解析地得到這些問題絕熱近似下的孤子參數演化，並由此選擇頻率濾波的參數，最後用分步傅里葉方法，在對非線性項微商的演算法做出了適合於mnls孤子的改善後，對拉曼效應及頻率濾波進行了直接數值模擬，其中頻率濾波參數用微擾理論確定。
  6. Analyze the linear dipole array with uniform element spacing using the method of moments ( mom ), derive the analytical expression for the recovered signal with the direct data domain method, demonstrate the effect of the mutual coupling on the performance of the antenna array by examples, the degradation of the system caused by the mutual coupling is simulated and analyzed in two different electromagnetic environments such as the weak and strong interference

    用矩量法計算了幾個信號同時照射時對稱陣子均勻直線陣的電流分佈，用直接數據域演算法推導了此接收陣列的恢復期望信號的表達式，舉例說明了互耦對陣列天線性能的影響，數值模擬了在弱干擾和強干擾下，互耦造成系統性能下降的情況並分析了原因。
  7. Finally, we convert this optimal problem to a nonlinear parameter optimization problem by collocation method. these studies examine the collocation method in case of equally or non - equally spaced division points, and in case of different numbers of nodes

    本文採用直接搜索法和節點配置，將連續動態最優控制問題轉換為靜態離散的數值優化問題，並對狀態和控制變量的約束進行轉化。
  8. ( 4 ) the drag reduction of plane - surfaces with v - shaped grooves is given out by direct numerical simulation, and the drag reduction mechanism in the base of the secondary flow theory is suggested

    （ 4 ）利用直接數值模擬方法求得平板上v ?型條紋表面上的降阻情況，並給出基於二次流動理論的降阻機理。
  9. Firstly, discrete methods of time and space in the dns are introduced in the present paper. and the procedure of solving the navier - stokes equation is also presented. in addition, ways of correcting time - splitting error and removing aliasing error in pesudospectral transform method are introduced too

    本文首先介紹了直接數值模擬中時間和空間離散的方法，並詳細介紹方程的求解的步驟以及偽譜法中混淆誤差產生的原因及其消除方法，並對時間分裂法造成的散度誤差的修正方法進行了簡要的介紹。
  10. In this paper, two novel algorithms of reconstructing high resolution images from both overlapped parallel projection data and overlapped fan beam projection data with low resolution are presented. one is called virtual detector algorithm, and the other is direct reconstruction algorithm. both of the algorithms with two forms for the parallel data and fan beam data respectively are developed based on the interpolative algebraic reconstruction techniques ( iart )

    本文在研究插值代數重建法（ iart ）的基礎上，根據特別設計的數據採集模式（平行相疊采樣和扇形相疊采樣） ，提出了由相疊低分辨數據重建高分辨圖像的兩個新演算法，即虛擬探測器法和直接重建法。
  11. The six methods are as follows : the supperposition method, the state space method, the complex mode method, the direct integral method, the numerical method for solving the initial - value problem of first - order ordinary differential coupled equations with constant coefficients, and the time domain finite element method

    這六種方法是：振型疊加法、狀態空間法、復模態法、直接積分法、一階常微分方程組初值問題的數值解法和時域有限元法。
  12. The results of the axial and transversal intensity distributions of gaussian beams and 0 - order bessel - gaussian beams show that the results by the optimized laguerre - gaussian truncated series are in good agreement with those by the fresnel diffraction integral method if the integration plane is not close to the aperture

    對高斯光束和零階貝塞爾高斯光束的軸向和橫向光強分佈的計算結果表明：當積分面不是很靠近光闌時，用參數最佳化選取的拉蓋爾高斯截斷級數法與用直接數值積分所得結果符合很好。
  13. In the first part, we have studied the stimulated algorithm of the diffraction of light ; and, through direct integral, convolution, and fourier transform, we created the numerical algorithm of fresnel integral and additionally, these three methods have also been compared in this paper

    首先研究光線衍射傳播的模擬演算法，分別利用直接積分法、卷積法和傅里葉變換法實現了菲涅耳積分的數值計算方法，同時比較了這三種方法的優劣。
  14. The settling behaviors of a rectangular particle with different initial orientation angles and length - width ratios were simulated by using distributed lagrange multiplier / fictitious domain method

    摘要為了對方形粒子在二維垂直通道中的沉降運動特性進行研究，應用了拉格朗日乘子虛擬區域方法對不同初始取向角、不同長寬比情況下方形粒子的沉降運動進行了直接數值模擬。
  15. To solve the overflow or underflow of the components of appearance attributes caused by watermarking, we clip the error ones to the correct ranges by adjusting the corresponding basis function elements. the normalization operation would destroy the watermark embedded in the normal vector. the author presents a novel approach by rotating the normal vector around a fixed axis, which will modify its orientation, not magnitude

    其中，針對在外觀屬性分量上植入水印的值溢出問題，作者提出了動態修改基函數的方法；考慮到直接修改法向量分量的方法會受到法向量單位化操作影響導致水印提取困難，作者提出一種繞固定軸旋轉法向量的方法，有效地避免了單位化對已植入水印信息的影響。
  16. The objective of present work is to explore the fully developed turbulent flow in a cylindrical smooth pipe by means of direct numerical simulation

    本文採用直接數值模擬的方法對光滑圓管充分發展湍流進行了研究。
  17. ( 3 ) by means of expanding the aperture function into a finite sum of complex gaussian functions, the propagation of fgbs through a paraxial optical abcd system with hard - edged aperture is studied, and the approximate closed - form equations of apertured fgbs are obtained for the first time. the results obtained by using the approximate closed - form equation and collins formula are compared, and the condition under which the approximate closed - form equation is applicable is analyzed

    （ 3 ）利用光闌函數的復高斯函數展開法對截斷平頂高斯光束的傳輸作了研究，首次得到了截斷平頂高斯光束在近軸abcd光學系統中傳輸時的近似解析傳輸公式，通過比較用近似傳物公式和colhns公式直接數值積分所得的結果，得出了近似公式的適用范圍。
  18. The method avoids the shortcomings of the unreasonable mesh and slowly calculation speed with the numerical method directly

    該演算法克服了直接利用數值法計算時剖分不合理、計算速度慢的缺點，使得計算結果更加快速、準確。
  19. Direct numerical simulation is used for solving the navier - stokes equation and lagrangian approach is used to track the bubble trajectories through the action of forces imposed by the fluid and the gravity

    採用直接數值模擬方法模擬流體流動，並用拉格朗日法跟蹤氣泡受流體和重力作用所產生的運動軌跡。
  20. The present work is carried out by direct numerical simulation ( dns ), the non - linear navier - stokes equation is formulated in terms of spectral method with fringe method. the objective of present work is to explore the spatial and temporal evolution of pipe flow with the disturbance imposed on the pipe wall in the form of periodic suction and blowing ( psb )

    本文使用直接數值模擬（ dns ）方法，通過譜方法結合嵌邊法求解非線性的navier - stokes方程，來研究由圓管壁面引入的周期性吹吸（ psb ）擾動作用下，圓管流動沿流向的空間演化規律及其相應的時間演化過程。
分享友人
分享到 Line

分享到臉書