基于最大Lyapunov指数的公路沉降预测

根据混沌理论具有分析非线性动态系统混沌特性的特点,对公路路基沉降量相关时间序列进行了分析和研究.在相空间重构的基础上,利用C-C方法求嵌入时延与嵌入窗、G-P方法求嵌入维数;应用小数据量法计算公路沉降量相关时间序列的最大Lyapunov指数,并进行混沌特性分析,结果显示累积沉降量符合混沌特性.最后对短期沉降量进行了预测.     

激光水下目标探测中混沌背景信号重构的研究

对激光水下目标探测中混沌背景信号的重构问题进行了研究．讨论了混沌时间序列的动态特性，并实际计算了激光水下目标探测中混沌背景信号的时延、混沌维数等有关特征参量．在阐述神经网络重构时间序列模型机理的基础上，提出用神经网络局部预测法重构水下目标探测中混沌背景信号，最后在成功地重构出混沌背景信号的条件下，利用预测误差检测到水下目标探测中的有用弱信号．实验结果表明这种方法是比较有效的．     

基于多维泰勒网的自适应混沌时间序列多步预测

提出了一种新的混沌时间序列预测方法——多维泰勒网方法.该方法不以相空间重构方法中嵌入维数和时间延迟这两个关键参数的选取为前提,无需系统的先验知识和机理,仅根据已知的时间序列样本,通过多维泰勒网模型获得n元一阶多项式差分方程组,进而得到能反映非线性系统动力学特性的多维泰勒网动态模型.在此基础上提出了基于多维泰勒网的自适应多步预测方法,通过数据窗口的滑动自适应建模,实现对混沌时间序列的多步预测.将该方法应用于Lorenz混沌时间序列的一步和多步预测,均方误差分别达到2.56×10-5和2.76×10-3.仿真结果表明,该方法可以对混沌时间进行有效预测,且具有较高的预测精度.     

基于Lyapunov指数的预报方法及在气象预报中的应用

介绍了混沌时间序列的Lyapunov指数预报分析方法，并应用混沌方法对气象预测时间序列进行处理，把其混沌特性应用于气象预报中。根据气象时间观测数据计算了重构相空间嵌入维数D2和Lyapunov指数。结合实际例子对Lyapunov指数预测方法进行了验证。     

激光水下目标探测中混沌背景信号重构的研究

对激光水下目标探测中混沌景信号的重构问题进行了研究。讨论了混沌时间序列的动态特性，并实际计算了激光水下目标探测中混沌背影信号的时延、混沌维数等有关征参量。阐述神经网络重构时间序列模型机理的基础上，提出用神经网络局剖预测法重构水下目标探测中混沌背影信号，最后在成功地重构出屯背影信号的条件下，利用预测误差检测到水下目标探测中的有用弱信号。实验结果表明这种方法是比较有效的。     

船舶电力推进系统电力负荷混沌特性分析及预测

为实现船舶电力推进系统功耗的最优控制,提高船舶运行的经济性,建立了基于正则化的电力负荷混沌局域预测模型.运用相空间重构理论对船舶电力推进系统电力负荷进行单变量时间序列相空间重构,计算吸引子的Lyapunov指数,验证船舶电力推进系统电力负荷具有混沌特性,进而构建更为精准的由船舶电力负荷及其影响因素构成的多变量时间序列相空间.实验结果表明,该预测模型是有效的,且具有较高的预测精度.     

混沌算子网络在经济数据预测中的应用研究

采用多个混沌算子单元组成一种新的预测网络,实现经济数据的预测分析.利用已知数据构造出训练样本,通过调节混沌算子单元的控制参数来控制其动力学特性,以此改变预测网络的动力学行为,使预测网络的动力学特性逐渐逼近被预测系统,并随之一致变化,从而实现时间序列的动态预测分析.利用该方法对国内生产总值和国民总收入等经济数据进行了预测...     

遗传算法在经济混沌组合预测中的应用

经济混沌是由确定性的经济系统产生具有随机性的动态行为。虽然经济系统产生的时间序列不具有长期预测性，但在短期内可有较为精确的预测，可以为其建立确定性的预测模型。为了探求经济时间序列中的混沌特性，文中在Wolf提出的相空间重构的基础上，提出了一种基于遗传算法的经济混沌组合预测方法，在该方法中采用自适应并行遗传算法确定组合模型中权系数，这样可以较好地解决传统经济混沌预测大多数都是使用单一模型以至影响了观测精度等问题，最后以实例检验了提出的算法。     

一种基于混合模型WRC的流量预测方法

针对当前网络流量预测方法在刻画网络流量多重特性方面存在的准确性及噪声干扰的问题,提出了一种基于混合模型WRC的流量预测方法,该方法利用小波分解将网络流量混沌时间序列分解为流量特性不同的近似时间序列和细节时间序列,并利用RBF神经网络和混沌模型分别对这两种时间序列进行处理,得到预测时间序列后再进行小波重构,得到最终的预测值.仿真实验结果表明模型预测有效,且预测精度较高.     

基于Lyapunov指数的预报方法及在气象预报中的应用

介绍了混沌时间序列的 Lyapunov指数预报分析方法 ,并应用混沌方法对气象预测时间序列进行处理 ,把其混沌特性应用于气象预报中。根据气象时间观测数据计算了重构相空间嵌入维数 D2 和 Lyapunov指数。结合实际例子对 Lyapunov指数预测方法进行了验证。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that