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crossover
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    Secondly,the temperature fluctuations can be characterized by a long-range power-law correlation with an exponent =0.66.Thirdly,the scale of 18 years can not be regarded as a crossover for the limit of the length of the series,though the exponent at large scale of more than 18 years is different from that of less than 18 years.
    尽管大于 18a尺度区间的α与小于 18a尺度区间的α有所不同 ,但可能由于所分析的温度序列长度受到限制 ,没有足够充分的理由认为 18a是个交叉点。
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    The preliminary results show that there exist two different scaling invariant ranges, divided by one crossover in the three temperature series, which may indicatetwo different underlyingphysical mechanisms.
    结果表明:全球气温、北半球气温和中国气温都有由交叉点划分的两个标度不变区域,可能对应两个不同的物理机制。
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  crossover
At each iterate, by reduplication, crossover and mutation, a finite set of points can be used.
      
For the genetics algorithm, chromosome coding, fitness function, parameters selection, and the basic genetics operation including selection, crossover and aberrance, are described.
      
Eight young, healthy male volunteers were exposed to two 24 h periods of continuous wakefulness during the crossover experiment.
      
Numerical investigation of aerodynamic performance influenced by circumferentially pre-swirling coming flow on the crossover and
      
Numerical investigation is implemented on aerodynamic performance inside the crossover and de-swirling cascade of a multistage centrifugal compressor.
      
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Heat lsland of PBL,Numerical model,Crossover eHect,Artifical heat release Abstract In order to understand the characteristics of Boundarv layer climate of the city of Xian,a svnthetic field observation on the boundary layer and the soil layer was carried Out fromOct.to Nov,in the Xian region,and several usefuI turbulence and radiation data are ob-tained.A two-Dimensional dynamical and thermal numerical model used in PBL structure of the city,The turbulence colosure is based on the turbulent energy equation;the...

Heat lsland of PBL,Numerical model,Crossover eHect,Artifical heat release Abstract In order to understand the characteristics of Boundarv layer climate of the city of Xian,a svnthetic field observation on the boundary layer and the soil layer was carried Out fromOct.to Nov,in the Xian region,and several usefuI turbulence and radiation data are ob-tained.A two-Dimensional dynamical and thermal numerical model used in PBL structure of the city,The turbulence colosure is based on the turbulent energy equation;the soil proper-ties and radiative properties are also considered in the model.The simulating results from the model are suitable to illustrate the situation ofthe Xianheat lsland by using field data.The result of calculations shows the existance of urban heat island which is several de-grees higher in temperature than adjacent rural regions. The result also compares the impor-tance of different factors such as artifical heat release,soil properties and the surface rough-ness.The total amount of fuel consumed in the Xian industrial area and its increase rate in re-cent yearsvhave been carefully studied.The predicted tendency seems good in compared with teh climatic analyses, which indi-cates that the urban-rural temperature difference in the year of 2000 is about 0. 6℃ morethan that of the mowadays.

本文使用非定常二维边界层大气动力和热力方程组数值模式,结合西安市1983年秋冬季城郊气象场的观测资料及能源耗量,分析计算了西安城市热岛热力场的特性和强度,并评估了由于城市能源消耗总量的增加对未来城市热岛的影响。

To study the specific law and the scale range of long-range correlation,series of average monthly anomaly over China from Jan. 1873 to Nov.1990 is analyzed with the detrended fluctuation analysis. The preliminary results show as follows. Firstly,there exists the long-range correlation in the average monthly temperature fluctuations. Secondly,the temperature fluctuations can be characterized by a long-range power-law correlation with an exponent =0.66.Thirdly,the scale of 18 years can not be regarded as a crossover...

To study the specific law and the scale range of long-range correlation,series of average monthly anomaly over China from Jan. 1873 to Nov.1990 is analyzed with the detrended fluctuation analysis. The preliminary results show as follows. Firstly,there exists the long-range correlation in the average monthly temperature fluctuations. Secondly,the temperature fluctuations can be characterized by a long-range power-law correlation with an exponent =0.66.Thirdly,the scale of 18 years can not be regarded as a crossover for the limit of the length of the series,though the exponent at large scale of more than 18 years is different from that of less than 18 years.

为研究我国近百年气温的长程相关规律 ,通过对我国近百年月平均温度序列的非趋势波动分析 ,初步得出以下几个结论 :我国近百年气温存在内在的长程相关性 ;标度指数α 0 .6 6 ;尽管大于 18a尺度区间的α与小于 18a尺度区间的α有所不同 ,但可能由于所分析的温度序列长度受到限制 ,没有足够充分的理由认为 18a是个交叉点。

To study the long range power-law correlations of themonthly average anomaliesover the global, Northern Hemisphere, and China in the recent 140 years,the detrended fluctuation analysis (DFA)method is applied in this paper, which can effectively eliminate noise and possible nonstationarities in the data. The preliminary results show that there exist two different scaling invariant ranges, divided by one crossover in the three temperature series, which may indicatetwo different underlyingphysical mechanisms....

To study the long range power-law correlations of themonthly average anomaliesover the global, Northern Hemisphere, and China in the recent 140 years,the detrended fluctuation analysis (DFA)method is applied in this paper, which can effectively eliminate noise and possible nonstationarities in the data. The preliminary results show that there exist two different scaling invariant ranges, divided by one crossover in the three temperature series, which may indicatetwo different underlyingphysical mechanisms. Fist of all, they all present the positive long range correlations, and the persistence of the global temperature is the strongest, while China weaker than Northern Hemisphere. Secondly, the global and Northern Hemisphere temperatures can nearly behavior like 1/f noise, and China temperature can show behaviors between 1/f noise and Brown noise.

运用非趋势波动分析方法,有效地消除数据中噪声和非平稳性质的影响,研究全球、北半球和中国近140年气温变化的长程幂律相关性。结果表明:全球气温、北半球气温和中国气温都有由交叉点划分的两个标度不变区域,可能对应两个不同的物理机制。其一,都可以表现出正长程相关的性质,而且全球气温的持续性最强,北半球次之,中国气温最弱;其二,全球气温和北半球气温还可以有几乎是1/f噪声性质的变化,中国气温则可表现出介于1/f和布朗噪声之间的行为。

 
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