逆行演化 的英文怎麼說

中文拼音 [nìhángyǎnhuà]
逆行演化 英文
regressive evolution
  • 逆 : Ⅰ形容詞1 （方向相反） contrary; counter 2 [數學] inverse; converse Ⅱ動詞1 （抵觸; 不順從） go aga...
  • 行 : 行Ⅰ名詞1 （行列） line; row 2 （排行） seniority among brothers and sisters:你行幾? 我行三。where...
  • 演 : 動詞1 （演變; 演化） develop; evolve 2 （發揮） deduce; elaborate 3 （依照程式練習或計算） drill;...
  • 逆行 : 1 （反著規定的方向走） （of vehicles） go in a direction not allowed by traffic regulations; go i...
  • 演化 : evolution
  1. In the next place, by studying the change of the resonant frequency of the whole system, this paper designs the circuit to track the resonant frequency of the system by cd4046 mainly. at the same time, in order to improve the efficiency and get better dynamic capability of the converter, we choose pll and fuzzy control after comparing the pll circuit, fuzzy circuit and pll ? fuzzy control circuit. in the end, this paper brings forward the control blue print to realize the drive control circuit of the high frequency converter, using the dsp chip as the key part to realize four routes of pwm drive pulses with dead band of the control system

    其次，通過對整個系統諧振頻率變化的分析和研究，設計了以鎖相環cd4046為核心的鎖相環控制電路，同時，在綜合比較鎖相環控制、模糊控制以及模糊控制和鎖相環復合控制三種控制演算法的基礎上，進行了系統模擬，得出採用復合控制可使跟蹤電路既具有鎖相環路較好的穩態性能，又擁有模糊控制較好的動態性能，系統魯棒性能好，同時也提高了逆變器的效率。
  2. 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。
  3. Based on these research, we recovered the evolution history of overthrust faults vertical sealing ability and considered that there always have fracture activity ever since jidike formation deposition period. but this kind of activity is not always continuous. during moving period, fault is open

    在此基礎上對逆掩斷層垂向封閉性演化史進行了恢復，認為斷裂自吉迪克組沉積時期以來均有活動，但這種活動是間歇性的，活動時期斷層開啟，靜止時期斷層多是封閉的。
  4. This process is as follows : firstly, the data of different section contour and of section line have been obtained by reverse - engineering ; secondly, non - uniform b - spline approximation algorithm is used to fit the discrete data ; then the data have been optimized and reduced by adopting adaptive sampling of key points of the fitted curve based on vertical distance, sequently the adaptive sampling data is transformed into the format of the. ibl file of the famous 3 - d design software pro / e. therefore we reconstruct the surface and a model is generated ; lastly, the effectiveness of the adopted algorithm and modeling approach are demonstrated by the experiments

    建模型的過程中，首先運用逆向工程測量方法，獲得曲面物體上不同截面輪廓線的測量數據點列，接著對測量數據點進行平滑處理，用最小二乘法求解基於數據點列的控制多邊形，以非均勻三次b樣條曲線擬合截面輪廓曲線；然後利用基於垂距的數據采樣演算法，對擬合曲線上的數據點進行重新采樣，達到優化數據點的分佈及減少描述曲線數據量的目的。
  5. This digital amplifier made up of a digital inverter can implement the sine voltage signal ' s power amplifying based on the digital signal processor. with the high processing ability of dsp, the advanced digital control arithmetic can be realized in the software. also the feasible and effective technique for the time delay compensation of digital control can be achieved

    該放大系統用數字化逆變器來實現電力系統正弦電壓信號功率的放大，利用dsp數字處理器高速的處理能力，可以使系統實現高性能的演算法控制，並且能靈活地對系統的誤差進行補償，從而實現逆變系統的高性能和高精度，為解決電力系統電容式互感器二次側帶負載能力弱的問題進行了有意義的研究。
  6. There are four parts excluding the preface : part i analyzing the three stages of the institution evolution of issuing market, we can get some conclusions : first, the formation of the issuing institution be influenced by some history events, the developing direction of the issuing institution has been decided by some history conditions ; second, although the issuing market has been controlled strictly by our government, it has its own trend to be more unrestrained ; third, itffiuseful to make a foresight study on the long - term development on the issuing market. part ii introducing the abroad issuing institutions which include u. s. a, england, germany and h. k. we can know the reforming directions

    本文除前言之外，共分四個部分：第一部分縱向考察了我國股票發行制度演變的三個階段，通過對三個發展時期改革探索的分析，筆者認為： （ 1 ）我國股票發行制度演變初期明顯受到具體實踐與歷史條件的影響，特定的歷史條件決定了我國股票發行市場初期的制度選擇； （ 2 ）發行市場制度演化雖然受到了政府的引導和控制，但仍表現出不可逆轉的市場化趨勢； （ 3 ）目前股票發行市場制度建設已經由初期的單一子制度探索過渡到了全面制度建設時期，這時深入的、前瞻性的研究對我國股票市場制度建設意義重大。
  7. This d format can show the range of the data intuitively and express the real time data, which improves the speed and precision of svpwm arithmetic greatly. the ratio of carrier wave is increased and the blend of current is reduced, as a result the performance of the system is ameliorated. this thesis project has finished the debugging of the ac motor control system, and the result shows that hardware and software of the designed system is in reason

    在實現svpwm演算法的匯編程序中採用了一種新型的d定標法對標幺化的數值進行定標，這種d定標法能直觀的表示數值的大小范圍，可以實時的對數值進行定標，提高了svpwm演算法執行的精度和速度，增加了逆變器的載波比，減少了電流諧波，因而改善了交流變頻調速系統的性能。
  8. Specific issues examined are : compensation for the variation of the stator resistance, the offset error of the dc bus voltage, the voltage error generated by the forward voltage drop the dead time of the switches, improvement of the steady state performance, and the speed sensorless control for the pmsm dtc drive system are of major concern in this thesis

    定子電阻變化，直流母線電壓漂移，開關器件反向相電壓降、逆變器死區時間引起的電壓誤差的補償，提高系統穩態運行性能以及永磁同步電機直接轉矩控制的無速度傳感器運行方案等問題都是本文研究的重點。轉矩的快速響應是直接轉矩控制演算法的一個卓越的性能。
  9. The author puts forward the thought of analyzing bifurcation and chaos in dc / dc converters with the theories of nonlinear dynamics, and the thought of controlling nonlinear problems with linear controlling methods of modern control theory. chapter three ( research on bifurcation and chaos in pwm dc / dc converters ) first theoretically analyzes and emulates period - doubling bifurcation of pwm dc / dc converters with the " inverse " piecewise numerical emulation. then the author analyzes in detail the sampled - data model, the mathematical model, which is suitable to the nonlinear research of dc / dc converters

    第三章（ pwm型dc dc變換器中分岔與混沌的研究）首先採用「逆向」分段數值模擬法對pwm型dc dc變換器中的倍周期分岔進行了理論分析與數值模擬；接著詳細地分析了適合於dc dc變換器非線性研究的數學模型一采樣數據模型，提出了dc dc變換器中存在環面分岔與鞍結分岔的可能性；最後通過電路實驗驗證了在電路參數發生變化時， dc dc變換器經歷一系列的倍周期分岔通向混沌的演化過程，並對混沌態下dc dc變換器的輸出特性進行了分析與小結。
  10. Then, spherical harmonic transformation is used to generate some data for embedding watermarks. as a result, the watermarks can be embedded in the fourier - frequency domain of the original mesh. experimental results showed that our watermarking algorithm is robust since watermarks can be extracted without mesh alignment or re - meshing under a variety of attacks

    提出了基於球面參數化的三維網格模型水印演算法：利用網格全局球面參數化的方法得到網格的球面調和分析系數，將水印嵌入調和分析系數中，然後進行相應的逆變換得到嵌入水印的網格。
  11. Abstract : two computational techniques for inverse fight dynamics, namely derivation - iteration and integration - iteration techniques, are investigated. the application of inverse dynamics to determine control power requirements for post - stall maneuvering is researched, and a maneuvering flight trajectory based algorithm is provided, which lays a numerical foundation for simplifying design criteria for post - stall aircraft. with the model of inverse dynamics employed, a flight control mode for the outermost loop of the control system, named maneuver generator, is designed to follow desired complicated maneuvering flight trajectories. an example of rapid heading - reversal maneuver and other numerical simulations show the feasibility of the algorithm and the design idea

    文摘:考察了求解輸入類飛行逆動力學問題的微分-迭代與積分-迭代演算法;探討了利用逆動力學確定過失速機動操縱效能要求問題，這構成了進一步提出過失速機動飛機設計簡化判據的數值基礎;利用逆動力學設計機動發生模塊進行飛控系統的最外環控制，以便跟蹤期望的復雜機動軌跡.飛機最速反向示例及其它數值模擬結果表明設計思想與演算法是可行的
  12. This paper improves some commonly used stochastic optimization algorithms, such as genetic algorithm, simulated annealing algorithm and tabu search algorithm, and improved algorithms are verified by the standard mathematical functions. then, improved algorithms are used to solve practical electromagnetic problems and the items of practical application of algorithms worthy of paying attention to are emphasized

    本文對遺傳演算法、模擬退火演算法、禁忌搜索演算法等幾種常用的隨機類優化演算法進行了改進，以標準數學函數作為檢驗依據對改進演算法作出評價，並將各改進的演算法應用於實際電磁場逆問題的求解，總結其應用的實際經驗和見解。
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