正周期 的英文怎麼說

中文拼音 [zhēngzhōuqī]
正周期 英文
positive period
  • 正 : 正名詞（正月） the first month of the lunar year; the first moon
  • 周 : Ⅰ名詞1 （圈子; 周圍） circumference; periphery; circuit 2 （星期） week 3 [電學] （周波的簡稱） c...
  • 期 : 期名詞[書面語]1. （一周年） a full year; anniversary 2. （一整月） a full month
  1. Due to existing signal processing technology ’ s shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high - precise signal processing technology : firstly, to get power spectrum with hanning windowed welch modified periodogram, search its peak value frequency ; secondly, to apply zooming analysis via goertzel algorithm ; at last, to get a highly precise doppler frequency with energy centrobaric rectifying algorithm 。 the simulating result indicated that this technology introduced could get accurate doppler frequency 。 depending on above discussed technology, we designed a signal processing scheme, and developed a signal processing system. the running result showed high performance, verified the feasibility and reliability of the highly precise signal processing technology introduced. in a word, the technology improved ldv ’ s performance such as measurement precision, measurement range, dynamic response time 。 and it will have a wide application foreground

    針對存在的缺點，本文提出了一種應用於激光多普勒測速的高精度信號處理技術，即首先利用加hanning窗的welch修正周期圖演算法得到信號功率譜，搜索其譜峰值頻率，接著利用goertzel頻譜細化演算法對搜索的譜峰進行細化分析，再引入能量重心頻譜校正演算法對細化后的譜峰進行校正分析，從而將離散頻譜分析演算法、頻譜細化演算法和頻譜校正演算法三者有機結合起來，充分發揮各自的優點:通過加hanning窗的welch修正周期圖演算法快速得到功率譜及峰值頻率，通過goertzel演算法獲得分析頻帶的高解析度頻譜，然後通過能量重心校正演算法對細化后的頻譜進行高精度校正，這樣不僅保證了演算法的高效性，而且大大提高了分析的精度。
  2. Periodic function and its least positive period

    周期函數及其最小正周期
  3. Studied periodic function and its least positive period

    摘要研究了周期函數及其最小正周期的若干問題。
  4. Using better prior estimate, the theory of brower degree and coincidence degree, the existence of positive periodic solution of a kind of neutral population model with multiple delays was studied, some sufficient conditions were obtained, which improve of the relational theorem

    摘要通過更精確的先驗估計，利用重合度理論中的連續定理，研究了一類時滯種群模型的周期解，獲得了這類模型存在正周期解的充分條件，所得結果推廣了有關結論，並使條件有所減弱。
  5. Periodicity in predator - prey chain sytem of three species with impulse

    食餌鏈系統正周期解的存在性
  6. The global existence of periodic solution of a competition lotka - volterra model

    系統正周期解的存在性
  7. The existence of the periodic solution of a lotka - volterra system with impulses

    系統的正周期解的存在性
  8. Existence of periodic solutions for a class of mixed system with impulses

    一類脈沖混合系統正周期解的存在性
  9. Positive periodic solutions for nonautonomous differential equations with delay

    非自治時滯微分方程的正周期解
  10. The existence of positive periodic solution for a differtial equation with delay

    一類時滯微分方程正周期解的存在性
  11. Existence of positive periodic solutions of a class of delay differential equations

    一類時滯周期模型正周期解的存在性
  12. The existence of positive periodic solution for a neutral delay lotka - volterra system

    系統的正周期解的存在性和全局漸近穩定性
  13. Next we study the logistic model with both state - dependent delays and continuous delays and feedback control. with the help of coincidence degree theory, some new results for the existence of the postive periodic solution of the system are obtained. also, by constructing suitable lyapunov functional, some sufficient criteria for the uniqueness and globally asymptotic stability of positive periodic solution are established

    第二部分研究同時具有狀態依賴時滯和連續時滯的反饋控制logistic增長模型，利用重合度理論研究其正周期解的存在性問題，得到了該系統周期正解存在的充分性條件；通過構造適當的lyapunov泛函得到保證該系統存在全局穩定周期解的充分性條件。
  14. Existence of positive periodic solutions for a class of functional differential equations

    滯后型泛函微分方程正周期解的存在性
  15. The second part of this paper is concerned with the theory of retarded functional differential equations ( rfdes ) and applications to the existence of positive periodic solutions of rfdes

    本文的第二第二部分著重討論一類滯后型泛函微分方程（ rfdes ）正周期解的存在性。
  16. The first part is concerned with caristi ' s fixed point theorem, while the existence of positive periodic solutions of retarded functional differential equations is discussed in the second part

    第一部分研究集值型映射的caristi型不動點定理，第二部分討論滯后型泛函微分方程正周期解的存在性。
  17. The first part is concerned with the stability and hopf bifurcation from an equilibrium for two classes of retarded differential difference systems, while the second part deals with the existence of positive periodic solutions of retarded functional differential equations with infinite delay

    本文分兩個部分，第一部分研究兩類三維特殊的滯后型微分差分系統平衡點的穩定性和hopf分支，第二部分討論無窮時滯泛函微分方程正周期解的存在性。
  18. The whole paper consists of three parts : part is about general theory of the least positive period, which argues the necessary and sufficient condition for the existence of the least positive period for a periodic function, and concludes " the existence of the least positive period for that periodic function, which is continuous at least one point and not equal ever to a constant " ; part researches the least positive period for the sum of two periodic functions, followed its general expression ; part discusses non - periodicity for the compound function constructed by a periodic function and a non - periodic function, and the corresponding results

    全文分為三部份：第一部份是關于最小正周期的一般理論，得到了周期函數有最小正周期的充分必要條件，也獲得了「至少在一個點連續且不恆等於常數的周期函數必有最小正周期」的結論；第二部份分析了兩個周期函數之和的最小正周期的問題，給出了其一般表達式；第三部份討論了周期函數與某些類型的非周期函數構成的復合函數的非周期性問題，並得出相應結論。
  19. A counterexample on the existence of positive periodic solutions for two - species predator - prey diffusive systems

    食餌系統正周期解存在性的一個反例
  20. Extension of yoshizawa periodic solution theorem is mentioned in the third part. nonautonomous three species predator - prey delay diffusion system with michaelis - menten response function is studied. we obtain not only existence of periodic solution of the system, but also sufficient condition of positive periodic solution

    由於許許多多現實問題往往都可歸結為尋求以微分方程（常微分方程、泛函微分方程）為數學模型的周期解、概周期解，因此本文在第三部分運用yoshizawa型周期解定理的推廣，研究了以下具有michaelis ? menten型反應函數的非自治三種群時滯擴散捕食系統的周期解的存在性，給出存在正周期解的充分性條件。
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