periodic flow 中文意思是什麼
periodic flow
解釋
周期流-
In chapter 3, the subgrid eddy - viscosity model for large eddy simulation is applied to calculate the three dimensions unsteady periodic turbulent flow in yantan francis turbine. the pulsating characteristics of some main physical parameters in flow field are found. the calculated axial water thrust of hydraulic turbine agrees with the model - test value
第三章採用大渦模擬亞格子渦粘模型，對巖灘混流式水輪機的流場進行三維非定常湍流分析，得到了流場中各物理量的脈動特性，計算出ms的軸向水推力與模型試驗值大小相當；同時論證了對于下機架承重的混流式水輪發電機組可採用其推力軸承負荷作為水電站廠房振動的最大垂直激振荷載。 -
Based on the hydrodynamic, by using momentum theory to the liquid in the flow channel, the computational formula of the air exciting - vibration force is acquired. by using four - step runge - kutta method, the periodic response results of the elastic rotor system with one single - disc are gained. then the dynamic characteristics of the rotor system at the certain rotate speed and the certain physic parameter of system are analyzed by using the phase spaces and poincare maps of this system
基於流體動力學，通過對葉片流道內的流體模型應用動量定理，得到此汽流激振力模型，並採用四階龍格庫塔法，得出了單盤彈性轉子系統的周期響應規律，然後根據系統的相軌跡及poincare映射圖，分析了系統在特定轉速及特定的轉子系統參數下的運動特徵。 -
The result shows the periodic characteristics of microjet flow field including vortex pair evolution, immigration and dissipation process
模擬結果顯示了微射流的產生、形成、發展與耗散過程以及微射流的卷吸特徵等。 -
Flow details of measurement indicate that the coupling of periodic separated flow ( such as low frequency swinging of separation line ) with nozzle flow may cause aft - end internal flow unsteady. recirculation flow gains more energy from the main flow, at the same time the turbulence intensity increases
通過對測量結果的分析，我們認為分離流動的周期性（如分離線的低頻擺動）與噴管流動相耦合，會造成燃燒室尾部流動的非穩態效應增強，增加了迴流區從主流中獲得的能量，也加劇了流場的湍流脈動。 -
The thesis uses 0 - 1 integer linear programming to construct algorithm - hardware mapping models. based on bounds of data flow graph proposed by barwell and hodges, cost function combining iteration periodic bound with periodic delay bound and several constraints are proposed
根據已提出的數據流圖的界，確定規劃和映射模型的目標函數，即最小化循環周期界和周期延遲界，進而建立規劃和映射問題的一系列的約束條件。 -
Finally, the results are compared with periodic and random chains. then we studied acoustic wave propagation in 1d quasiperiodic and aperiodic systems by means of he transfer matrix. transmission rate, reflection rate, energy flow, logarithmic energy flow, energy density and lyapunov exponent are computed numerically, and compared with periodic and random system
其次研究了聲波在幾種一維準周期和非周期系統中的傳播，通過轉移矩陣的方法，數值地得到了系統的傳播系數t _ n 、反射系數r _ n 、能流密度j _ n ，能量密度e _ n和lyapunov指數，給出了以上各量與傳播長度n以及頻率之間的關系，同時發現能流及能量密度都具有分形結構，並與周期和隨機系統的結果作了比較。 -
Firstly, acoustic waves propagation in id quasi - periodic system is studied by means of the transfer matrix method. the transmission rate, reflection rate, energy flow, logarithmic energy flow, energy density and lyapunov exponent are obtained numerically. we explain all these parameters " relations with frequency and the size of system, and compare these p arameters with those o f periodic system. we find that these parameters are fractal in this quasi - period system
通過轉移矩陣的方法，數值地得到了系統的傳播系數t _ n 、反射系數r _ n ，能流密度j _ n 、能量密度e _ n 、李雅譜諾大指數_ n ，給出了以上各量與系統大小n以及頻率之間的關系，發現這些量存在著與周期系統不同的準周期性質，其能量會出現局域化現象，能流以及能量密度都具有分形結構，給出了相應的理論解釋。 -
Then it expounds and analyzes the researching statu of the enerprise ' s valuation of the world, especially on the discount cash flow valuation. among them it detailed analys how to determine the discount rate, the increase rate and the cash flow. at the same time it introduces the two other means that is the ratio and the option valuation and theirs scope of application, promoting some valuation model fitting for different enerprise and different asset for the especially case of m & a, and it expound how to use the cash flow discount to value the enterprise been placed in the circumstance of periodic company, operating the company in the difficulty, not listed company
本文正文部分首先對企業並購研究的相關知識進行了一下簡單的介紹，然後對國內外企業的價值評估方法及研究現狀進行了詳細和深入的闡述，特別是對貼現現金流估價法的分析比較詳細和深入，其中對其貼現率、增長率、現金流等基本參數的確定作了較詳細的分析，同時也介紹了另外兩種估價法即比率估價法和期權估價法的基本情況及其適用范圍。 -
Periodic sinusoidal flow
周期正弦流 -
In chapter 5, taking periodic examination subsystem of locomotive as examples, it explains system analysis methods of developing information system and way of setting up the data flow sheet to realize the process management in the software
第五章以機車出入庫周期檢測子系統為例，詳細介紹了開發信息管理系統的系統分析方法和建立數據流程圖的途徑，從而達到在軟體中實現過程管理的目的。 -
This paper studies the passenger train operation plans based on periodic train diagrams, and considering the profits of the train transportation enterprises and waiting time of passengers, especially the uncertainty of the passenger flow, establishes the chance - constrained model with three specific objectives
本文研究基於周期運行圖的旅客列車開行方案，同時考慮鐵路運輸企業運營的收益、旅客的總等待時間等具體需求，特別考慮到客流的不確定性，建立了包含3個具體目標的機會約束模型。 -
( 2 ) as an application of ( 1 ), in view of the vagueness in the proof of the theorem 2. 1 : " a continuous flow is uniquely ergodic on 2 - dimensional torus if and only if it has at most one periodic orbit " in [ 2 ], we give it a proof
（ 2 ）作為（ 1 ）的應用，針對[ 2 ]的定理2 . 1 ： 「環面上無不動點的連續流是唯一遍歷的當且僅當它至多有一條周期軌」證明中所存在的含糊之處，我們給出了它的一個證明。 -
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。
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