China real estate periodic fluctuation based on principal component analysis 基于主成分分析的我国房地产业周期波动研究
The performance of periodic mental disease is more, general component is prodrome, mental symptom and body symptom. 周期性精神病的表现较多,一般分为前驱症状,精神症状和躯体症状。
The result showed the periodic component was found in the differential pressure fluctuation signal. 采用Hurst分析描述了管内气液两相流不同流型的压差波动特征,发现压差波动信号中存在着不同程度的周期成分。
The conventional measurement is not very accurate because they did not consider the effect of the harmonic wave and non periodic component on accurate measurement of factor. 传统的测量方法,没有很好地考虑系统的不对称性所造成的谐波以及非周期分量对功率因数测量的准确性的影响,测量精度不够。
But when the input signal is no longer the periodic function for the existing of DC component, the full-wave Fourier algorithm will have higher error. 当输入信号中含有衰减直流分量而不再是周期函数时,全波傅氏算法有较大的误差。
Because EDTA can bind with most metallic elements of the periodic table, this technique becomes a versatile tool in the production and study of new nano materials of multi component complex oxides. 而且,由于EDTA可以和元素周期表中绝大多数金属元素络合,因此,该技术可广泛应用于复杂氧化物体系纳米材料的制备及研究。
Whether there exists a periodic impulse component in a vibration signal is an important sign of a mechanical device being faulty. 机械设备振动信号中是否存在周期性的冲击分量是其有无故障的重要标志。
After distinguishing and extracting the man-made periodic terms and Fisher test, the residual component may be considered as a stationary stochastic process. 在识别和提取人工周期项,并经FISHER检验后,可近似地认为它是平稳随机过程。
The model of crop yields prediction with periodic component was built by using the method of stepwise regression and the model of crop yield prediction was built by using the method of variance analysis in time serise. 本文由作物产量序列提取出显著周期分量,建立带有周期分量的逐步回归预报模型;运用时间序列的方差分析方法,建立作物产量的预报模型。
In order to improve the property of the predictor, the three points smooth method and the method of deleting periodic determinative component, and predicting the stochastic component are used. 为了进一步改善预报器的性能,采用了三点平滑以及先消除周期性的确定性分量再进行自适应预报的方法。
The characteristics of error motion of shafting is a complex signal which includes periodic component and random term. 轴系回转误差运动的特征是一项复合信号,它含有周期分量和随机分量。
Harmonic suppression, non periodic and non closing in straightness profile error that bring about harmonic component distortion in slide error motion measurement are analyzed in detail. 分析了经典频域三点法测量直行部件运动误差时所存在的谐波抑制,直线度误差的非周期性、非封闭性以及端点不连续而引起的高阶谐波分量失真等方法误差。
It is difficult to detect the periodic impulse component in the vibration acceleration signal with conventional analysis methods such as time domain wave and frequency spectrum. 通过时域波形和频谱等基本分析手段来探测振动加速度信号中的周期性冲击分量往往是困难的。
Periodic component is found in the pressure fluctuation signal. 发现压力波动信号中存在着不同程度的周期成分。
The periodic variable-speed motion was needed in the mechanical scanning and driving system of microwave remote sensor. According to the controlling requirement of speed and position, a driving and controlling system was developed using the stepping motor as executive component. 针对存在周期性变速运动的微波遥感器机械扫描驱动系统,根据其扫描运动的速度、位置控制要求,采用步进电机做为执行元件研制开发了一套驱动控制系统。
Under the low-voltage signal condition, protection's requisition for precision of Fourier algorithm will be higher, propose roll Fourier algorithm, improve filter algorithm's ability to suppress the decaying non-periodic component. 同时由于低电压信号下对保护傅立叶算法精度要求更高,提出滚动傅立叶算法,提高滤波算法抑制衰减非周期分量能力。
However, in respect of a vibration acceleration signal, the signal to noise ratio ( SNR) is often so small that the periodic impulse component is submersed in its intense background noises. 通常检测的机械振动加速度信号,由于信噪比太低,即使存在周期性的冲击分量也往往被淹没在强的背景噪声之中。
The accumulative periodic diagram was used for the periodic element identification. Practical computation method for Variant AC component of short-circuit current 变化的短路电流周期分量的实用计算方法
The surface thermal wave signal pre-processing is made according to the characteristics of heat wave signal contains periodic components and the DC component. 针对周期激励所得到的试件表面热波信号含有周期分量和直流分量的特点,对表面热波信号进行了预处理。
Algorithms based on periodic function model contain full-cycle fourier algorithm and half-cycle fourier algorithm and are adapt to extracting the fundamental component. 周期函数模型算法分为全周波傅氏算法和半周波傅氏算法,最适合微机保护计算基波分量。
Firstly, the algorithm eliminates periodic oscillation in data through processing residual between sample data and actual data. Then the independent component information of residual is extracted using ICA method. 该算法首先通过样本数据和实际数据的残差处理消除数据的周期振荡,然后用ICA方法提取残差数据独立元信息,接着用T2和SPE统计量对过程进行监测,最后用贡献图分离故障。
Due to non-Gaussian problem with periodic disturbance in the industrial process, an improved independent component analysis method based on residual analysis is proposed. 本文根据流程工业中非线性、非高斯的问题,提出了一种基于残差分析的改进独立元分析方法。
With "S" shaped curve sampling method, periodic determinated Achnatherum splendens aerial parts and root fembers in order to summarize the development characteristics of each component. 采用S形曲线采样法,定期测定芨芨草根系及地上部分构件,归纳出芨芨草各构件发育特点。
This correlation is more obvious than other periodic component of LOD. And there is clear physical meaning between them. This has guiding significance for us to forecast the strong earthquakes in future. 这种相关性比其它日长周期分量与强震的相关性表现的更加明显,具有明确的物理意义,对于预测未来强震发生的时间、地点,乃至震级都有一定的指导和借鉴意义,有较好的应用价值。