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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
Two methods of signal smoothing were considered: square-wave (moving average) and triangular (weighted average) filters.
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On Guaranteed Estimation of the Spectral Density of an Autoregression-Moving Average Process
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An estimate for the spectral density of a stationary autoregression-moving average process with a given mean-square accuracy is proposed.
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When the interval used for the moving average is increased to 8-12 years, a quasi-22-year rotational period appears.
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We firstly propose a method to fit the fractional autoregressive integrated moving average (FARIMA) models to four actual wireless traffic traces and a traffic prediction based on the upper probability limit.
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| | In this paper, the rain and clear sky observations in Beijing by the Royal Observatory of the Ghing Dynasty were used and combined with instrumental records to reconstruct rainy season from 1724 to 1978. Its characteristics and variations were discussed and concluded as follows:1.There were 6 patterns of rainy season in Beijing during the last 255 years, and each of them prevailed in a certain period of time.2.The begining date of rainy season in Beijing in the average was in the 3rd. decade of June, ... | | 本文利用1724—1903年北京故宫“晴雨录”中雨日记载,与现代气象资料衔接,确定了北京1724—1978年共255年雨季的起迄,并且讨论了雨季特征及其长期演变规律。 北京雨季可划分为六种类型:提前型、落后型、偏长型、偏短型、双峰型、假雨季和副雨季。北京雨季平均开始于6月25—29日,结束于8月9—13日,雨季乎均长50天。雨季起始期具有4.5年周期:雨季结束期具有4年左右和85年左右周期;雨季长度具有85年和170年左右周期。此外,北京255年雨季变化存在明显的由短变长的长期趋势。近30年来北京雨季处于近255年来异常偏长阶段。 | | 文摘来源 | | The pseudo-velocity log, or seismic approximate impedance log (SAIL), is an approximate solution to the inverse problem of a seismogram. It is a method for strati-graphic interpretation. So far, the methods applied in SAIL are all based on linear model in which each seismic trace must be expressed by convolving a seismic wavelet with a reflection coefficient sequence of a stratified medium. In this way, it is difficult to consider the effects as resulted from transmission coefficient and multiple reflection... | | 根据声测井得出的速度分布统计特征,给出了多层构造反射系数序列的自相关函数形式。在反射系数强度不太大的条件下,导出存在于速度分布统计特征与多层构造反射传递函数之间的一种简单关系。据此,对目前常用的线性地震拟测井处理过程进行了具体分析,指出畸变恒不可免;在此基础上,提出了实际处理中力求减小畸变的可能途径。 | | 文摘来源 | | After reviewing the application of system identification to aircraft flutter research, three methods of system identification are presented in this paper. Emphases are put on the main points of identification algorithm and its theoretical basis. The problems related to data processing are also discussed. The Transfer Function Method based on complex modal analysis and optimization technique can identify all of the modal parameters accurately. Furthermore, this method has been applied to the flutter model te... | | 本文在简要综述了系统识别技术在飞机颤振研究中的应用后,介绍了三种系统识别方法。重点讨论了其算法要点及理论基础。对有关数据处理问题也作了适当说明。基于复模态分析和优化技术的传递函数法可以精确识别出全部模态参数,并在带外挂机翼颤振模型试验中获得成功,该法可推广到仅有响应数据的风洞与飞行试验情况。脉冲响应和自回归滑动平均模型法采用了相关和最小二乘技术,可以在较强干扰情况下得到精确结果,后者还可求出估计值与真值的协方差。两种时域方法皆可无需专用信号分析设备而直接利用测量采样数据进行系统识别。 | | 文摘来源 | |   | | << 更多相关文摘 |
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