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周期项
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  periodic term
     It is shown that the new results of general perturbations for those asteroids have been obviously improved because of considering (3E-10θ) long periodic term and refining the coefficients of main periodic terms including (E-3θ) term, etc.
     与过去用Bohlin群法计算所得近似解作比较,因现在计及了(3E-10θ)长周期项和精化了(E-3θ)等主要周期项的系数,使得这些小行星普遍摄动计算的结果有了明显的改进。
短句来源
     This paper presents a wavelet analysis based on forecasting model for software reliability. By the model, the time series of software faults can be decomposed into trend term, periodic term and time-modulated stationary processes, and then forecast them separately.
     本文提出的软件可靠性预测模型,通过小波分解将非平稳的软件可靠性随机序列分解成趋势项、周期项和一系列时间调制平稳随机序列,对趋势项和周期项按常规的预测方法进行预测,而时间调制平稳随机序列再用小波方法预测,最后合成得到软件可靠性预测。
短句来源
     On the basis of state space model of system dynamics, the decomposition of periodic term and trend term in the time series of both power demand and Gross Domestic Product (GDP) are carried out respectively, and it is discovered that there is a strong correlativity between the periodic terms of power demand and the GDP.
     文章基于系统动力学的状态空间模型对电力需求与国内生产总值(GrossDomesticProduct,GDP)增长率时间序列分别进行周期项与趋势项的分解,发现电力需求与GDP分解的周期项之间存在很强的相关关系;
短句来源
     In this paper, mathematic models including a trending term and a periodic term are developed to describe the changes in the water level.
     该文建立趋势项与周期项之和的数学模型来描述水位的实际变化。
短句来源
     The paper analyses the particularities of Shandong province's past power generation date accompanied by multiplication model proposal, which is being resolved into a tendency and a periodic term with help of the medium moving averaging method.
     该文分析了山东省发电量数据特点 ,提出了乘积模型。 应用中位移动平均法 ,将其分解成趋势项和周期项
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  periodic component
     Eliminate the effect of noise and seasons, we can get the periodic component in these time series.
     对该序列去除噪音影响和季节影响后,得到时间序列的周期项
短句来源
     After that, we can perform cycle analysis on the periodic component.
     再对周期项利用谱分析的方法进行周期分析。
短句来源
     In this study, time series model, Xt = Tt + Pt + Rt, is used to simulate the ob- served hydrologic process. The results show that human activities have a great influence on trend component Tt, but nothing on periodic component Pt and random component Rt . Based on the characteristics or Tt, this model is used to predict some hydrologic processes under the environmental changes.
     本文采用水文时间序列模型xt=Tt+Pt+Rt模拟实测水文过程.分析结果表明,人类活动 对趋势项Tt影响很大.而周期项Pt和随机项Rt则几乎没什么影响.在此基础上,根据Tt的变化 规律,作者对环境影响下的水文过程进行预测.
短句来源
     The stochastic characteristics of reference evapotranspiration series and precipitation series were analyzed by time series analysis method,and each series was decomposed to trend component,periodic component and(stationary) stochastic component.
     采用时间序列分析方法对ET0序列和降水(P)序列的随机特性进行了分析,并将以上序列分解为趋势项、周期项(包括均值和标准差)和平稳随机项。
短句来源
     Based on the separation of tendency,periodic component and randomness of precipitation sequences,the paper gives a way to calculate the model with a program with the base of Fortran language and MATLAB language.
     在分离和构造逐月降水序列趋势项、周期项和随机性项的基础上,给出基于Fortran和MATLAB的程序实现思路.
短句来源
  “周期项”译为未确定词的双语例句
     3. The osculating elements in computing dσ/dt are calculated with σ* plus the dt short period terms △σ_s, in which the first order short period terms △σ_s are obtained by analytical method, and the second order ones △σ_s by Fourier analysis.
     ii),计算dσ/dt中所用的密切根数σ,由σ~*加上短周期项△σ_s,而得,其中一阶短周期项△σ_s~((1))用分析公式计算,二阶短周期项△σ_s~((2))用Fourier分析方法求取。
短句来源
     Based on the time series decomposable method,a prediction model of annual runoff has established on Wulasitai River,which contains the trend item,period item and the random series.
     在剖析了现有年径流量预测方法的基础上,根据乌拉斯台河年径流量(1960年~1989年)序列的长期变化特征,提出了时间序列分解预测模型,即将年径流系列分解为趋势项、周期项、随机项,通过对其各项进行识别、提取,再将各项线性叠加,从而建立年径流量预测模型。
短句来源
     In this paper, the short periodic fluctuations of the M1, Mm tides are analysed from the new IERS UT1 series in using the method of Marple estimate. The amplitude of the M1, Mm tides, annual term and semi-annual term are estimated. The Love numbers K(Kmf=0.305±0.040, KMm = 0.301±0.062) are also estimated.
     本文用自回归谱的Marple算法,对1990年发表的IERS新UT1-UTC序列进行了分析,得到了与理论值非常接近的潮汐短周期项Mf、Mm波的谱峰及周年项、半年项的谱峰,还用最小二乘法对它们进行了振幅估计,并解算了Love数K值,结果为KMf=0.305±0.040,KMm=0.303±0.062。
短句来源
     The Δσ_s (up to third order) are derived by-Fourier analysis and the dσ~*/dt (up to fourth order) can be computed by the numerical average method.
     短周期项△σ_s(准到三阶)可用Fourier分析方法求得,而百(dσ~*)/(dt)(准到四阶)则用数值平均方法计算。
短句来源
     Long periodfluctuations have difference periods in x-axis and y-axis. They are 31.7-year and24-year in x-axis and 28.5-year and 22.9-year in y-axis. These 2~?
     长周期项中Markowitz项在X、Y两个方向有不同的周期,它们分别是:X方向的两个周期是31.7年和24年,Y方向的两个周期为28.5年和22.9年它们叠加在一起是一个线偏振运动,最大振幅约为30mas,偏振方向在西经144°和东经36°之间;
短句来源
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  periodic term
The energy of deformation contains a periodic term and gradient terms.
      
The data were interpolated using a model with a linear term and an annual periodic term.
      
Mathematic models consisting of a periodic term plus a linear term are established to describe the changes in the tide and the groundwater levels.
      
A singularly perturbed elliptic partial differential equation with an almost periodic term
      
An elliptic partial differential equation with a symmetrical almost periodic term
      
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  periodic component
The periodic component of the dynamics of down's syndrome incidence
      
A theoretical analysis is made of the interaction of wave disturbances of small finite amplitude in a boundary layer in the case when the velocity distribution contains a periodic component that oscillates in time in accordance with a harmonic law.
      
Application of the Method of Particle Image Velocimetry for Analyzing Turbulent Flows with a Periodic Component
      
Binaural unmasking of the periodic component in the envelope of an amplitude-modulated signal
      
For the 62-h periodicity, we constructed an average 25-50-keV light curve and estimated the spectral flux density, which characterizes the intensity of the periodic component at different energies in different observing intervals during 1995-1997.
      
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In this paper certain non-autonomous systems with periodic right-hand

本文讨论右边为周期项的非自治系统。§§1,2谈次调和共振,建立反周期解的存在唯一定理;同时给出寻求这些反周期解的有效方法.在§3考虑具有反周期系数的线性变换的某些特质,由此获得这系统的解集所定出的映射可有反鞍点存在的充分条件。

In this paper a new semi-analytical and semi-numerical method for computation of the second order perturbation of artificial earth satellites is presented. Its basie ideas are the following 1. In our analysis, we adopt σ* as the fundamental elements system, where σ*'s are mean elements, obtained after subtracting the short, period terms △σ_s. from the oscula-ting elements. 2. The σ*'s secular and long period rates (up to third order) are derived with the numerical averages of dσ/dt, which are the rates of the...

In this paper a new semi-analytical and semi-numerical method for computation of the second order perturbation of artificial earth satellites is presented. Its basie ideas are the following 1. In our analysis, we adopt σ* as the fundamental elements system, where σ*'s are mean elements, obtained after subtracting the short, period terms △σ_s. from the oscula-ting elements. 2. The σ*'s secular and long period rates (up to third order) are derived with the numerical averages of dσ/dt, which are the rates of the osculating elements. 3. The osculating elements in computing dσ/dt are calculated with σ* plus the dt short period terms △σ_s, in which the first order short period terms △σ_s are obtained by analytical method, and the second order ones △σ_s by Fourier analysis. Because of adopting σ~* as the elements system, we have overcome some shortco-mings in the numerical method, such as the shorter step, the longer computing time, the more serious accumulatation of errors, etc. As we compute dσ~*/dt and △σ_s by means of numerical method, we have avoided the development of the complicate for-mulae. In this way, our method also has the advantages of simpler computing for-mulae and more convenient programming. To compute the second order perturbation, the computing time of our method is only 1/10 of the classical numerical method, and the memories is about 1/5 of the pure analytical method. The numerical method of ODE are also discussed. An improved Chebychev itera-tion process is developed to adapt the need of the orbit determination in satellite dynamical geodesy. In this paper we also give detailed formulae for computing the perturbating forces and the numerical results of computation by our method. The numerical results show that the errors in radius and across-track are less than 0.1 m, and that in along-track less than 1 m.

本文提出了一种新的计算人造卫星二阶摄动的半分析、半数值方法,其基本思想是: i),采用σ~*作为基本根数系统;这里σ~*是从密切根数σ中扣去短周期项△σ_s的平根数。 ii),σ~*的长期、长周期变率(准到三阶)由密切限的变率dσ/dt的数值平均求得。 ii),计算dσ/dt中所用的密切根数σ,由σ~*加上短周期项△σ_s,而得,其中一阶短周期项△σ_s~((1))用分析公式计算,二阶短周期项△σ_s~((2))用Fourier分析方法求取。由于采用了σ~*作为根数系统,克服了密切根数σ数值方法的积分步长短、计算时间长、积累误差大等缺点;由于dσ/dt、△σ_s~((2))用数值方法计算,又避免了繁复的公式推导,兼得了计算公式简单,程序编制方便等优点。用本方法计算二阶摄动,计算时间比经典的数值方法要节省十分之九,所占内存的大小可比分析方法节省4/5—5/6。本文还讨论了微分方程的数值积分方法,改进了迭代过程,使得它更适合于卫星动力测地中测轨的要求。本文还给出了用本方法计算的数值结果。数值结果表明:用本方法测轨,向径、垂迹方向误差小于0.1米,沿迹方向误差小于1米。

After an analysis of the secular variation of the common Z-Term in latitude, the existence of the non-polar long period terms in latitude is verified. Together with the spectral analysis of the path of secular polar motion and of the differences between different systems, a conclusion is suggested that these non-polar long period terms are not the common term existing in every latitude series, so they have influence on the path of secular polar motion.

本文从讨论纬度公共Z项长期变化的规律入手,证实了纬度非极变化中存在着某些长周期项。结合分析长期极移轨线和各系统间差异的谱结构,提出这些非极长周期项并不是所有的纬度序列所公有的,因而对长期极移的轨线造成影响。

 
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