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周期现象
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  cycle phenomenon
     Long Cycle Phenomenon of Global Oil Price Fluctuations
     国际油价波动长周期现象探讨
短句来源
     Patients with atrial fibrillation(8 cases) and atrial flutter(6 cases) were studied in order to reveal clinical significance of long_ cycle _ short _ cycle phenomenon in initializing atrial fibrillation and flutter.
     为了解心房颤动及心房扑动发生时的长短周期现象的临床意义 ,观察经动态心电图或监测心电图证实的心房颤动8例和心房扑动6例。
短句来源
     Initializing effect(atrial fibrillation and flutter) of long _ cycle _ short _ cycle phenomenon could be reproduced by programmed electrical stimulation.
     长短周期现象对心房颤动、心房扑动的启动作用可经心脏的程序刺激诱发和复制 ;
短句来源
     Based upon the discussion of Krugman's Multiple Equilibria Theory, the paper tries to explain the long cycle phenomenon of international oil price fluctuations by taking a close look at the evolution of the long-term market supply and demand.
     在讨论克鲁格曼多重均衡理论基础上,以长期市场供求关系演变解释了国际油价波动长周期现象
短句来源
  periodic phenomena
     The results of spectral analyses are shown as follows: 1)Under normal conditions, the spectrum characteristics of GPS time comparison are basically smooth, there are no obvious periodic phenomena and the noise process is white noise PM.
     频谱分析的结果表明:1)正常状态下,GPS时间比对的频谱特性是基本平坦的,没有明显的周期现象,噪声过程为调相白噪声;
短句来源
     2) When GPS time comparison is affected by SA effect, the low spectra are relatively obvious, and there are obvious periodic phenomena. The periodic signals of 5~15 min take up about 77% among these obvious periods.
     2)当GPS时间比对受SA效应影响时,低频谱较明显,有明显的周期现象,其中5~15分钟的周期信号约占77%。
短句来源
     Experimental Study on Transient and Periodic Phenomena of Cavitating Flow for a Hydrofoil at Small Angle of Attack
     小攻角水翼空泡流瞬态与周期现象试验
短句来源
     The mecha-nism pointed out that under the c ondi tion of membrane reaction carrying t o some extent,when the reaction rate is proportion to diffusion velocity,a regular periodic phenomena can be pr oduc ed.
     这个机理指出,在膜反应批量进行的条件下,当反应速率与扩散成比例时,便会产生规则的周期现象.
短句来源
     Some semi-monthly periodic phenomena and anomalies revealed by earth scientists in stu- dying geology and geophysics in the recent decade are reviewed in this paper from the angle of semi-monthly period.
     本文从半月周期的角度出发,概述了近10年来地学学者所研究和揭示的地质学及地球物理学的半月周期现象与异常。
短句来源
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  periodic phenomenon
     PERIODIC PHENOMENON IN PREDATOR──PREY SYSTEMS
     捕食──被捕食系统中的周期现象
短句来源
     Cosine curve is a simple model indicating the periodic phenomenon.
     余弦曲线是周期现象的简单模型 .
短句来源
  “周期现象”译为未确定词的双语例句
     Based on PSPICE, the period-doubling phenomena exhibited by a current-programmed DC/DC buck-boost switching converter are studied.
     基于PSPICE仿真,研究了电流控制DC/DC Buck-Boost开关转换器中的倍周期现象
短句来源
     While η=0.5, space-amplitude plot is analyzed in every combination by nonlinearity parameter 1.25≤a≤2.0 and strength of coupling 0.01≤ε≤0.40. The results show that SLCMLs has an abundant phenomenon of period-doubling influencing spatiotemporal evolvement of the saturation line besides some basic patterns of coupled map lattices.
     分析了η=0.5时,模型在非线性强度1.25≤a≤2.0及耦合强度0.01≤ε≤0.04各种组合下的空间振幅变化图。 研究结果表明:浸润线耦合映象格子模型除了具有耦合映象格子模型的一些基本模式外,倍周期现象特别突出并深刻影响着浸润线的时空演化;
短句来源
     The Influence of Precession Instability on Short Period Variations of SS433
     进动不规则性对SS433短周期现象的影响
短句来源
     On the Dynamic and Periodical Phenomenon in the Process of Enterprises’Production and Marketing
     企业生产经营过程中的动态周期现象
短句来源
     With the quasi-periodicity of OOMS, the iterative OOMS algorithm complexity on encryption and decryption image is declined to O(n~7).
     对图像加密和解密而言,准周期现象可将迭代算法复杂度降至O(n7).
短句来源
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  cycle phenomenon
The limit-cycle phenomenon in the Lorenz system is studied with considering bifurcation slates of a dynamic system.
      
Note that because of the smoothness of sinusoids, the limit-cycle phenomenon might not be observed for high-gain controllers.
      
The filters listed above represent a particular view on how the growth-cycle phenomenon is determined.
      
The relay controller performs satisfactorily in terms of speed of response, but the large limit cycle phenomenon degrades its accuracy.
      
  periodic phenomena
On periodic phenomena and stationary distribution of queueing system M/G/1 with group arrivals and batch service
      
However, in this form the method still relies on a subjective observer in order to extract and verify the existence of the periodic phenomena.
      
Kinetic models similar to this one may be applicable to periodic phenomena displayed by other biological systems with differentiated components of defined lifetimes.
      
Combined application of laser-Doppler anemometry (LDA) and particle image velocimetry (PIV) demonstrates the suitability of both measurement techniques to capture the development of unsteady, periodic phenomena.
      
It uses the fact that topological changes of a velocity field are continuous in time to extract large scale periodic phenomena from insufficiently time-resolved datasets.
      
更多          
  periodic phenomenon
Over relatively short time intervals (some minutes) the temporal course of venous pulse in terms of vessel width is a more or less periodic phenomenon; for longer periods (months) a study is underway.
      
Fire clearly appear to be a periodic phenomenon, not-withstanding the difficulty of showing periodicity in simple weather time series.
      
It was suggested that dark14CO2 incorporation might be a periodic phenomenon depending mainly on the productive capacity of the phytoplankton community.
      
A missing link: What is behind de Broglie's "periodic phenomenon"
      
The present work constitutes an attempt to give the interpretation of de Broglie's internal periodic phenomenon which ascribes the frequencym0c2/h to each single entity in its eigensystem of coordinates.
      
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In this paper, an exact method to solve the forced oscillations and self-excited oscil-lations of relay servomechanisms with backlash is suggested based on the theory ofTsypkin. The effects of backlash on the periodic behavour of forced oscillations and self-excited oscillations are also discussed. In the system discussed, the relay has ideal charac-teristics with or without hysteresis loop; the linear part has transfer function of the formk/p(T_1p+1). The parametric regions for the existence of forced and self-excited...

In this paper, an exact method to solve the forced oscillations and self-excited oscil-lations of relay servomechanisms with backlash is suggested based on the theory ofTsypkin. The effects of backlash on the periodic behavour of forced oscillations and self-excited oscillations are also discussed. In the system discussed, the relay has ideal charac-teristics with or without hysteresis loop; the linear part has transfer function of the formk/p(T_1p+1). The parametric regions for the existence of forced and self-excited oscil-lations are obtained.

在崔普金理论的基础上,提出一种求解具有间隙的继电系统中强制振荡与自振荡参数的准确方法。同时亦讨论了间隙对周期现象的影响。所讨论的系统中,继电器具有理想继电特性(有回环及无回环);线性部分传递函数形如K/p(T_1p+1)。得出了系统存在强制振荡及自振荡的参量域。

This report is a summary of more than 10 years observation on phehologyof 29 species of woody plants in Beijing. Phenological spectra of the woodyspecies were constructed by noting down the dateS of seasonal changes, suchas opening of bud, spreading of leaf, flowering, maturing of fruit or seed andleaf fall etc, in connection on with teqerature record of corresponding date.A daily mean temperature steadily above 3℃ is necessary for opening of budfor most species, but with a few species, the bud will open if...

This report is a summary of more than 10 years observation on phehologyof 29 species of woody plants in Beijing. Phenological spectra of the woodyspecies were constructed by noting down the dateS of seasonal changes, suchas opening of bud, spreading of leaf, flowering, maturing of fruit or seed andleaf fall etc, in connection on with teqerature record of corresponding date.A daily mean temperature steadily above 3℃ is necessary for opening of budfor most species, but with a few species, the bud will open if the dailymean is above 0℃. Phenophases of different species vary,but their sequence is definite.Phenophases, especially those in early f Spring season, are closely correlatedwith the accumulative active temperature. The phenological spectra of the species studied can be classified into 3groups and 9 types.The first group is flower before fruit with one type, earlyflower and early fruit type.The second group is flower with leaf, with twotypes, the early flower and intermediate fruit trre, and the early flower andlate fruit type The third group is flower after leaf,with 6 types:1. early flowerand early fruit type, 2. early flower and intermediate fruit type, 3. earlyflower and late fruit type, 4.intermediate flower and intermediate fruit type,5. intermediate flower and late fruit type, 6.late flower and late fruit type.Tree species with similar type of phenophase will be similar in biologicalor ecological characteristics, phenological observations are, therefore, quiteuseful in introduction of foreign tree species in silvicultaral practices.

北京树木物候谱是根据作者等十多年观测树木的萌芽、展叶、开花、果熟和落叶等生活周期现象编绘而成。北京树木萌芽始期一般在日平均温度稳定在3℃以上,少数种类在0℃以上即能萌动。树木各物候期因树种不同而有差异,但有一定的顺序性。树木各物候期,特别是早春各物候期与活动积温关系极为密切。北京29种树木物候谱可分为三类九型。从各物候谱的类型可以了解各树种物候学特性的共性和差异,进而了解各树种的生物学和生态学特性,对林业生产有很重要的实践意义。对农、医和生物学工作者也有一定参考价值。

In this paper the relation between El Nino and the variation of the earth rotation has been studied by using a statistical analysis,where the lod data (provided by BIH) and the southern oscilation index data have been used.

本文用统计方法分析地球自转速率变化与E1 Nini现象之间的关系。地球自转速率变化采用的是BIH提供的日长变化资料,而E1 Nino现象则用南方涛动指数表达。日长变化的频谱成分中有很强的季节性分量,这部分可以相当完善地用大气角动量的变化来解释。日长变化中还有明显的长期和长周期成分,长期变化可以由潮汐耗散和冰期后效应来解释,十年左右周期的变化则可能是核、幔耦合的结果。E1 Nino现象是时间尺度为几年的再发性准周期现象。在这个谱段,日长变化的振幅较小。为此,只有把日长变化的季节分量,长期、长周期分量滤掉,留下时间尺度为几年的频率成分,然后再去与E1 Nino现象进行相关分析,才能由此得到有益的信息。用ARMA方法进行谱分析,结果表明在1~10年时间尺度范围内,日长变化与南方涛动指数均在六年、三点五年及二点五年附近出现强的谱峰。但两者的谱峰位置,尚有0.3年左右的差异。定性地看,强E1 Nino现象与日长变化之间有相关性是肯定的。定量计算表明,不加平滑求出的相关系数仅有0.4。相关系数不高的原因之一是资料的噪声。采用12个月滑动平滑可使噪声较明显减少,由此求得的相关系数增加为0.6,相关程度仍不算很高...

本文用统计方法分析地球自转速率变化与E1 Nini现象之间的关系。地球自转速率变化采用的是BIH提供的日长变化资料,而E1 Nino现象则用南方涛动指数表达。日长变化的频谱成分中有很强的季节性分量,这部分可以相当完善地用大气角动量的变化来解释。日长变化中还有明显的长期和长周期成分,长期变化可以由潮汐耗散和冰期后效应来解释,十年左右周期的变化则可能是核、幔耦合的结果。E1 Nino现象是时间尺度为几年的再发性准周期现象。在这个谱段,日长变化的振幅较小。为此,只有把日长变化的季节分量,长期、长周期分量滤掉,留下时间尺度为几年的频率成分,然后再去与E1 Nino现象进行相关分析,才能由此得到有益的信息。用ARMA方法进行谱分析,结果表明在1~10年时间尺度范围内,日长变化与南方涛动指数均在六年、三点五年及二点五年附近出现强的谱峰。但两者的谱峰位置,尚有0.3年左右的差异。定性地看,强E1 Nino现象与日长变化之间有相关性是肯定的。定量计算表明,不加平滑求出的相关系数仅有0.4。相关系数不高的原因之一是资料的噪声。采用12个月滑动平滑可使噪声较明显减少,由此求得的相关系数增加为0.6,相关程度仍不算很高。相关系数不能再提高的主要原因之一,是由于在不发生E1 Nino现象期间,南方涛动指数与日长变化相关甚差,因而尽管在发生E1 Nino现象的短时期内相关很强,在整个时期内平均而言就只有中等程度的相关性了。为了便于讨论激发机制,用互相关方法计算了时间延迟。结果表明在E1 Nino提前一、二个月的时候,互相关达到最大;而当假定日长变化超前时,互相关系数就明显减小。计算结果不能证明自转变化激发E1 Nino现象的说法。

 
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