基于混沌理论的股票价格实时预测

本文分析了股票的混沌性,根据复杂的股票价格特点,改进了混沌时间序列预测方法中的加权一阶局域法与基于最大Lyapunov指数的预测方法,并将其成功应用于股票价格预测。在数值试验中,对股票价格进行了分析,利用上述两种方法进行了拟合和预测,得到了令人满意的结果,说明这两种方法是可行的,结果是理想的。     

关于铁路物流中心物流量预测的探讨

本文论述了铁路物流中心物流量预测的具体步骤，以及处理数据资料和分析物流量品类结构的方法。在此基础上给出了物流量预测的两种方法德尔匪法和弹性系数法。     

两种季节趋势预测法在风能预测中的应用

近年来,随着风能发电的兴起,风能实时预测也因风能的波动性和间歇性而成为风电并网中的一个难题.该文基于2011年“电工杯”数学建模大赛A题中给出的数据,应用了两种不同的季节趋势预测法对风能进行实时预测,并对这两种方法提出了改进.预测结果和改进结果量示,应用改进后的季节趋势预测法对风能实时预测的准确度和合格度超过了国家要求标准的80％.     

马尔柯夫链-线性回归组合预测专门人才方法

根据最小二乘法原理,确定马尔柯夫链和线性回归两种预测方法的组合加权系数;在建立数学模型时,既考虑了影响专门人才数量的各种因素,又考虑了专门人才的动态分布,避免了以往单一预测方法仅限于利用部分信息资料的缺陷;在预测专门人才结构时,根据两种方法组合预测值来修正马尔柯夫模型中的补充量,使预测结构更合理．     

复杂岩溶隧道涌水量预测分析

隧道涌水量预测方法很多,不同方法的适用性差别也较大。其首要因素是对工程实际地质状况的了解程度。隧道涌水量预测一般采用两种及两种以上的方法,便于不同方法之间作对比分析。通过探讨隧道涌水量预测发展状况,结合别岩槽隧道工程实际地质状况,采用地下水径流模数法与降水入渗系数法对别岩槽隧道进行分段涌水量预测。其中降水入渗系数法又称水均衡法,通过两种计算方法差别的比较,对复杂岩溶隧道涌水量预测做了分析,从而使其尽可能与实际产生涌水量大小相接近。     

基于有限元和神经网络法的桩基础沉降分析

以沉降控制复合桩基础的沉降为研究对象,介绍了有限元和神经网络法的数值分析方法,并运用这两种方法对桩的沉降量进行了预测,对比了它们的结果,分析其产生差异的原因,结果表明:两种方法的沉降预测数据与实测数据误差均小于10%,说明预测精度较高,可以在节省资源的情况下获得较理想的预测结果.     

金属材料在重复冲击下的损伤演化

为了探究金属材料在重复冲击下的损伤演化规律,基于Lemaitre损伤演化模型,提出了两种损伤演化方程建立方法——直接法和修正法。基于这两种方法建立了7075铝合金的损伤演化方程,并对两种损伤演化方程进行了对比研究,结果表明：直接法和修正法得到的损伤演化方程形式不同,但其损伤演化曲线十分相似,对试样失效前的可冲击次数预测十分相近,通过与实验值的对比,认为两种损伤演化方程在一定范围内对于重复冲击寿命的预测都有较高的准确性。     

中国轿车近期市场预测方法研究

在综合分析国内外现有预测模型的基础上,提出了适合中国国情的轿车市场预测方法--弹性系数法和指数平滑法,并对这两种方法在轿车市场预测模型中的应用进行了对比分析.     

几种沉降预测法在真空-堆载法处理高速铁路软基中的应用

路堤在高速铁路施工和运营过程中不发生过大的沉降是提高列车运行速度的关键,因此在高速铁路软基处理过程中应用沉降预测方法预测沉降和提高预测的精度有很大的实用价值和理论意义．基于试验段实测沉降曲线,将指数曲线配合法、双曲线法和Asaoka法应用于京沪高速铁路路基工程,预测了路基的最终沉降;应用有限单元法计算软件,采用两种土体本构模型结合实验室实验参数模拟现场状况,进行了沉降预测．在此基础上,将几种方法计算结果进行了对比,并与实测值互相印证,进行了一些讨论,希望能供广大工程技术人员参考．     

基于Holt′s方法的飞机使用保障费用预测研究

飞机使用保障费用在全寿命周期费用中占有很大比例,科学预测使用保障费用具有重要意义.针对使用保障费用的影响因素多导致其预测难度大的问题,提出了一种基于Holt′s方法的飞机使用保障费用预测方法,然后对某型飞机的使用保障费用进行了预测,并与三年移动平均法和单指数平滑法的预测结果做了对比.预测结果表明,Holt′s方法明显优于其它两种方法,预测精度高.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the