間斷頻率 的英文怎麼說

中文拼音 [jiānduànbīnlǜ]
間斷頻率 英文
chopper frequency
  • 間 : 間Ⅰ名詞1 （中間） between; among 2 （一定的空間或時間里） with a definite time or space 3 （一間...
  • 斷 : Ⅰ動詞1 （分成段） break; snap 2 （斷絕;隔斷） break off; cut off; stop 3 （戒除） give up; abstai...
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 率 : 率名詞（比值） rate; ratio; proportion
  • 間斷 : be disconnected; be interrupted; interval; leapfrogging; disjunction; break hiatus; hiatus; inter...
  • 頻率 : frequency; rate
  1. The dynamo runs at rull speed to drive main shaft, then the main shaft makes the emulsifying wings in emulsification grove rotate, which absorbs the liquid in its brand groove into ring groove through guide vanes on upper and lower sides of the groove. the vanes spins circularly at high speed with the main shatf as center, and the blade and emulsificaton groove cut and crush it continuously. after that. it gers squeezed by the vanes highspeed centrifugal rotation. at last, it finishes isotropt emulsification tratment within extremely short time after continuous circulating mixing

    由電動機全速運轉帶動主軸，經主軸轉動乳化框槽內之乳化翼片，使其將桶槽內之液體經框槽上、下兩側之導流葉片吸入環狀框槽內，經以主軸為中心高速圓周旋轉葉片；連續使乳化翼端刀面與乳化框間極小之間系高頻率之強力切割剪斷、粉碎，再借葉片高速離心旋轉排擠，持續循環混合，以極短之時間即可完成均質乳化之處理。
  2. From the result we get the following conclusion : for narrow - band signal, the effect of the method based on fft is best. for wide - band signal, when snr is up to certain degree ( higher than - 7db or so ), the curves of square error of modified methods are more obvious and closer to crb. for an echo composed of more than one frequency or direction, space - frequency distribution could show more direct information of frequency and direction, which is more advantaged to make precise judge and estimation for doa of echo

    從估計結果發現，對于窄帶回波信號，基於fft的方法估計性能大大優于其他方法；對于寬帶回波信號，在信噪比達到一定程度（高於約- 7db ）時，補償后的幾種估計法的性能改善均比較明顯，誤差曲線越來越接近crb曲線；對于回波中存在多頻率多方位的情況，空間?頻率分布圖能提供較為直觀的頻率及方位信息，因此應用空間?頻率估計法來進行方位估計，更有利於進一步對回波的具體方位進行準確判斷和估計。
  3. The temperature range is - 30 ~ 80. the topology of the step - up dc / dc converters and its basic principle is first analyzed in this thesis. then based on the conventional pfm control scheme, a discrete pulse frequency modulation is presented and the state space average model related to the ccm ( continue current mode ) and dcm is established

    然後在傳統的脈沖頻率調制方式的基礎上，分析了一種離散脈沖頻率調制方式，並建立了這種調制方式下升壓型dc / dc變換器在電流連續（ ccm ）工作模式和電流斷續（ dcm ）工作模式的狀態空間平均模型。
  4. High - frequency link power converters are receiving increasing attention. when the input frequency of ac - ac converter is quite high, such as 20khz or above, in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage, the switching cycle becomes discrete pulse spectrums, however, the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria

    當交-交變頻器的輸入頻率非常高，通常為20khz時，為了在零電壓條件下實現逆變器開關管的通斷，變換器的開關時刻必須選擇在高頻交流電壓脈沖為零時，這意味著變換器開關時刻在時間軸上成為不連續的點，而常規的硬開關pwm變換器是將開關時刻選擇在任意時刻。
  5. This paper proves that the changes of pre - compression on the windings have effects on their natural frequencies and derives their relation, which provides the experimental and theories foundation for fault diagnosis of large - scale electric transformers

    通過對大型變壓器繞組進行振動實驗和根據建立的變壓器繞組軸向振動數學模型的理論推導，闡明了變壓器繞組預緊力的變化與其固有頻率變化之間的關系，這為大型變壓器的故障診斷提供了理論與實踐依據。
  6. With the development of the converter drive technology, the requirement for the variable frequency drive are becoming more and more strict especially for the modern converter drive employing fast switching semiconductor igbt ， though it has high pulse frequency and refreshing time of only nanoseconds, it generates emf that has adverse effect on the environment

    隨著頻率控制傳動技術的發展，對頻率變速傳動系統的要求越來越高，尤其是對採用快速切換的igbt半導體現代變頻技術，盡管脈沖頻率高或更斷時間僅毫微秒內，但它們會對周圍環境產生電磁場。
  7. The control tactics of space voltage vector are investigated, and the simplified algorithm which judges the sector location of reference vector and calculates switch operation time is put forward. by analyzing the current hysteresis control, the relation between switch frequency, and hysteresis bandwidth and input inductance of pwm rectifier is deduced. by applying instantaneous power theory, the principle of pwm rectifier power control is analyzed, and the direct power control by matlab toolbox through estimating active power and reactive power with virtual flux is realized, and the simulation results prove that it is correct

    對常用空間電壓矢量控制策略進行分析，提出了給定參考矢量所在區間判斷的簡化方法，以及電壓矢量作用時間的求取方法；分析了電流滯環控制策略，推導出開關頻率與滯環帶寬以及整流器輸入電感之間的關系；應用瞬時功率理論分析pwm整流器功率控制原理，通過虛擬磁鏈估計有功功率和無功功率，用matlab實現了直接功率控制，並驗證了該控制方法的正確性。
  8. Since 1960 ", the methods for charactering time - frequency stability in time - domain have been in progress. the methods include allan variance, modified allan variance, time variance, hardamard variance, total variance, time interval error ( tie ) and maximum time interval error ( mtie ), of which tie and mt1e are usually used for telecommunication network

    自20世紀60年代以來，時間及頻率穩定度的表徵方法一直在不斷的發展，有阿侖方差、修正阿侖方差、時間方差、哈達瑪方差、總方差以及常用於電信網路的時間間隔誤差（ tie ）和最大時間間隔誤差（ mtie ） 。
  9. The situation of yellow river dry - up is gradually rigorous. it has being influenced the development of the lower reaches of yellow river and the implement of strategy on developing the western areas. based on analyzing the harmfulness, causes of its dry - up from the factors of physical geography and human activities, this article put forward the engineering and non - engineering control measures for controlling yellow river dry - up : strenghtening the unified management and despatch for its water resource ; resorting to compulsion to save water ; quickening key projects duild for the addition of balance and water storing capacity ; increasing synthetical administer to ecological environment ; increasing effectivesupply of water resource

    黃河斷流形勢日趨嚴峻，斷流的頻率增加、時間延長、里程增大，嚴重製約了黃河流域尤其是黃河下游地區的可持續發展和開發大西部戰略的實施.在分析黃河斷流造成的危害、黃河斷流的自然因素和人為因素的基礎上，提出了加強黃河水資源的統一管理和調度、採取強制措施厲行節約用水、加快骨幹工程建設增加調蓄能力、加大流域生態環境綜合治理的力度、適時開源增加水資源的有效供給等工程性和非工程性措施，以防治黃河的斷流
  10. The results showed that the intensity of uterine contraction was reinforced by mifepristone and misoprostol used in combination ; and the random uterine contraction was effectively inhibited and the effective uterine contraction was strengthened by acupuncture

    為探討針刺、藥物抗早孕的作用機制，我們採用早孕大鼠模型，建立間接反映子宮內壓的記錄方法，安放電極記錄子宮收縮頻率、強度作為判斷宮縮變化的指標，科學、簡便、靈敏、客觀地記錄宮內壓變化及子宮收縮情況。
  11. This dissertation put forward a method of eliminating noise and reconstituting broken wires signal and inquired the space - frequency range of the signal ripple resulted from tensile stress on the mfl signal curve

    提出了去除干擾重組斷絲信號的方法，分析了漏磁曲線上應力波紋的空間頻率分量。
  12. The paper decomposes the visitor ' s flow sequence made of different frequencies into the low and high frequencies in the multi - resolution analysis according to the characteristic of visitor ' s flow sequence frequencies and then restores the trend components according to the reconstruct principle of wavelet coefficients, in order to deduce the visitor ' s flow trend

    摘要根據旅遊流量的頻率分佈特性，運用小波分析將不同頻率成分組成的時間序列分解成低頻和高頻成分，然後依據小波系數的重構原理還原時間序列的趨勢成分，判斷旅遊流量時間序列的趨勢變化。
  13. Abstract : biological invasions are a continuous feature of a non - equilibrium world, ever more so as a result of accidental and deliberate introductions by mankind. while many of these introductions are apparently harmless, others have significant consequences for organisms native to the invaded range, and entire communities may be affected. here we provide a survey of common models of range expansion, and outline the consequences these models have for patterns in genetic diversity and population structure. we describe how patterns of genetic diversity at a range of markers can be used to infer invasion routes, and to reveal the roles of selection and drift in shaping population genetic patterns that accompany range expansion. we summarise a growing range of population genetic techniques that allow large changes in population size ( bottlenecks and population expansions ) to be inferred over a range of timescales. finally, we illustrate some of the approaches described using data for a suite of invasions by oak gallwasps ( hymenoptera, cynipidae, cynipini ) in europe. we show that over timescales ranging from 500 10000 years, allele frequency data for polymorphic allozymes reveal ( a ) a consistent loss of genetic diversity along invasion routes, confirming the role of glacial refugia as centres of genetic diversity over these timescales, and ( b ) that populations in the invaded range are more subdivided genetically than those in the native range of each species. this spatial variation in population structure may be the result of variation in the patchiness of resources exploited by gallwasps, particularly host oak plants

    文摘:生物入侵是不均衡世界的一個永恆話題，尤其是當人類有意或無意地引入物種后.很多引入顯然是無害的，但另外一些則有著嚴重的後果，會給入侵地的生物以至於整個生物群落造成影響.本文總結了分佈區擴張的常見模式，概述了它們對遺傳多樣性和種群結構式樣所造成的影響.描述了如何根據以一批遺傳標記所得到的遺傳多樣性式樣來推斷入侵途徑，來揭示伴隨擴張選擇和漂變在形成種群遺傳樣式中的作用.本文對日益增多的群體遺傳學方法進行了總結，這些技術可以用來在不同的時間尺度上推斷種群規模所發生的巨大變化（瓶頸效應及種群擴張） .最後，我們以歐洲櫟癭蜂（膜翅目，癭蜂科，癭蜂族）一系列入侵的數據為例對一些方法進行了說明.從500 10000年的時間尺度上，多態的等位酶位點上等位基因頻率的數據表明: 1 ）遺傳多樣性沿入侵路線呈不斷下降的趨勢，支持了冰河期避難所作為遺傳多樣性中心的作用; 2 ）入侵地區的種群與該物種原產地的種群相比，遺傳上的分化更為強烈.這種種群結構在空間上的變異可能是被櫟癭蜂開發的資源尤其是櫟樹寄主在斑塊上出現變異的反映
  14. The algorithm is also applied in the broken rotor bars detection in squirrel cage induction machines, which is dependent on detecting the twice slip frequency modulation due to the speed or torque in the stator current, and the rotor bar faults can be detected effectively without some preprocessing

    指出可以利用信號的小波脊線來提取頻率隨時間連續變換的信號的瞬時頻率，並將該瞬時頻率提取演算法成功地應用到異步電動機定子起動電流信號的分析中，有效地提取出了轉子斷條故障特徵。
  15. Estimation of the reservoir permeability using the frequency offset and time lag of stoneley wave

    利用斯通利波的頻率偏移和時間延遲判斷儲層滲透性
  16. The discontinuous phase method combined with eddy current sensor is introduced to acquire blade dynamic signal 。 the author designed the program of computing blade vibration parameters and have made computer simulation ， so we can get blade amplitude and frequency

    提出採用間斷相位法和電渦流傳感器結合來獲得葉片的振動信號，編制了測量葉片振動參數的計算程序，並進行了計算機模擬模擬，得到了葉片振動振幅和頻率。
  17. Measurement times and schedules may be changed based on engineering judgment with regard to gage use frequency, calibration interval, repair times, environment etc

    測量時間和周期可以根據工程判斷或量具的使用頻率，校正周期，維修時間，環境等調整。
  18. By use of gabor wavelet transform and mae technologies, the arrived time to sensors of transient ae signals of specific guided mode can be precisely obtained. as the result, the precision of leak location was improved

    利用gabor小波變換方法對斷鉛聲發射信號進行時頻分析，通過確定某一頻率下某一模態導波到達傳感器的時間，較好地實現了聲發射源定位。
  19. This paper carry out power system post - stability analysis with eurostag. this paper determine the state after low frequency oscillation according to the relation between oscillation frequency of low frequency oscillation and eigen value of small signal analysis, which is derived from a great deal of simulation projects. cai xiaoling ( power system and its automation ) directed by prof

    利用eurostag進行電力系統后穩定分析，針對低頻振蕩引起的后穩定問題，通過大量模擬研究了小擾動特徵值分析結果和大擾動振蕩頻率之間的關系，並據此判斷系統發生低頻振蕩失穩后的狀態，為將來進行后穩定后續分析打好基礎。
  20. Four white noises which have different cut off frequency were used as random control signal ( target signal ) in the simulation experiment. the results indicated that the correlation between the measured velocities and target signals decreased when the cut off frequency of the target signal increased. the correlation between the measured velocities and the target signals with cut off frequency of 0. 1 hz was 0. 85 ~ 0. 9

    在風洞中利用截斷頻率分別是0 . 1赫茲、 0 . 15赫茲、 0 . 2赫茲和0 . 4赫茲的水平譜原始信號進行模擬實驗，結果表明隨著原始信號的截斷頻率增大，實驗風速信號與原始信號的相關系數逐漸變小，當原始信號截斷頻率為0 . 1赫茲時，相關系數在0 . 85 0 . 9之間，而當截斷頻率為0 . 4赫茲時相關系數僅為0 . 3左右。
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