模糊逼近预测方法和统计数据相关性处理的预测意义

模糊逼近NFDE预测是一种新的模糊逼近定量预测方法,此方法给出了科学的分析统计数据以进行相关性数学处理并实现预测的公式.这些方法,其本身不仅作为一种预测方法而具有广泛的预测应用价值,而且能使我们从系统理论的角度来考察实际预测问题,使很多难以用现成方法解决的实际预测问题得到有效解决.     

直升机航迹的灰色预测

介绍了直升机的飞行噪声特性,论述了直升机航迹的预测在作战中的重要性,及探测数据非常有限的情况下准确预测的困难。该文提出了用灰色系统珲论解决直升机航迹预测问题,建立了灰色系统GM(灰色模型)预测模型和九次累加残差模型并对GM预测模型进行修正。在每个采样期间内,实时在线建立GM预测模型和残差模型以提高预测精度。通过实例计算能看出用较少的探测数据可以得到较高的预测精度。     

灰色系统的弹箭系统研制费用估计模型的研究

对弹箭系统研制费用的估计常采用多元线性回归方程法。该方法要求有大量样本数据的情况 ,并且估计精度较差。在新型弹箭系统的研制中 ,由于样本数据较少 ,给研制费用估计带来一定的困难。该文应用灰色系统预测理论解决弹箭系统研制费用估计问题 ,建立了灰色系统GM预测模型和n次累加残差模型并对GM预测模型进行修正。通过实例计算能看出用较少的样本可以得到较高的预测精度。     

煤层突出危险性预测的未确知测度方法研究

基于未确知测度理论建立煤层突出危险性预测方法,构造未确知测度模型,计算各评价指标的未确知测度值.根据熵理论计算各评价指标的权重,用置信度识别准则进行等级判定,得出预测结果.该方法适用于解决煤层突出危险性预测过程中诸多因素的不确定性问题,还能对其进行定量分析.实例证明,用未确知测度理论方法对煤层突出危险性进行预测,计算结果与实际情况吻合较好.     

变权组合预测模型在人口增长预测中的应用

以中国人口增长问题为研究实例,利用1996～2007年各年的全国人口总数数据,采用变权组合预测方法对历年人口总数进行模拟,并进行预测,希望能够为我国解决人口问题提供帮助.     

线性系统在非线性等式约束下的集员卡尔曼滤波

为了解决运行系统要求的100%估计包含真实最小域的需要和计算机的实时计算问题,使用集员卡尔曼滤波算法解决非线性状态约束.采用最小迹椭球算法对状态向量的椭球域进行更新,同时分别在预测和滤波的2个阶段用投影的方法把没有约束的状态估计投影到有约束的状态估计表面来处理约束问题.最后将所设计的集员卡尔曼滤波器应用到汽车追踪实例中.实验结果表明:采用所提算法的系统只是在初始值有比较大的误差,在后续的跟踪过程中都能在最大最小界之内跟踪上真实值.所提算法相比于传统的卡尔曼算法,其误差能迅速减小.实例仿真结果证明了所提方法的可行性和有效性.     

Matlab在经济系统参数确定中的应用

采用系统辨识方法对动态经济系统进行了分析，并以此解决了一些不能用常规计量经济学来解决的问题，在此基础上对动态经济系统的各类性质进行了研究，通过具体实例叙述了Matlab在动态经济分析中的应用过程，说明该方法能够较好地解决动态经济系统问题。     

基于二次指数平滑法和优化Kalman滤波的短时交通组合预测

优化改进传统的Kalman滤波模型,解决预测精度不高且预测滞后的问题.用二次平滑指数法和优化后的Kalman滤波模型两种方法组合对道路断面通过交通量进行短时交通预测,通过平均绝对误差(MAE)和平均绝对百分比误差(MAPE)分析预测结果.实例预测结果表明:当修正因子α=0.5时预测结果较为精确,同时,优化改进后的Kalman滤波模型的预测准确性有所提高.组合预测的两种方法都能够有效地降低预测误差,但按权重组合预测的效果更为明显.     

一类有穷数列通项公式的求解方法与应用

介绍用向量空间的有关知识解决有穷数列问题;通过实例说明建构有穷数列预测市场动态变化的方法。     

时间序列系统的随机集建模与预测

介绍了随机集理论的基本数学概念.利用覆盖函数估计定义了一个模糊集,在此基础上将统计目标整合到基于规则的系统中.通过建模仿真,对有独立观测值的统计方法进行了很好的估计、预测和控制,提出了一种新的解决时间序列系统辨识的方法.实例结果表明,随机集是系统辨识的一个新的好方法.     

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.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-