投资项目的灰色综合评价及应用

针对投资项目评价问题,运用灰色系统和逐一比较法,提出了一个投资项目的灰色综合评价的方法,并且给出实例说明其应用。     

基于灰色系统理论的房地产投资环境分析方法

在研究近年来我国房地产开发投资环境分析方法的基础上，将灰色系统理论与传统的综合评价法相结合，得到了一种基于灰色系统理论关联度分析法的综合评价方法，是一种比传统的综合评价法更优的房地产投资环境分析方法．     

灰色模糊综合评价在新产品开发项目选择中的应用

通过对目前一些常用评价方法，如层次分析法AHP法，模糊综合评判法的优缺点研究，提出了灰色模糊关联新产品开发项目评价新方法。在上述研究的基础上，建立了基于灰色模糊理论新产品开发项目选择综合评价模型。     

多层次灰色评价法在房地产开发风险评价中的应用

文章首先阐述了多层次灰色评价法的概念,建立了房地产投资风险评估指标体系,构建了基于多层次灰色评价法的房地产投资风险评价模型;详细阐述了如何运用此方法对房地产投资风险进行评价。     

项目风险模糊灰色综合评价方法研究

针对单纯采用模糊评价或灰色评价方法都不能客观、准确地评价项目总体风险大小这一问题，利用灰色聚类理论得到指标灰色统计量，构造项目风险模糊隶属度矩阵，建立了一种灰色评价与模糊评价相结合的风险综合评价方法，该方法能充分利用专家评判信息的模糊性与灰性，使项目风险评价更为客观、准确。将此方法应用于航空武器装备项目风险综合评价的结果表明，该方法可行且有效。     

某企业安全投资方向的灰关联分析

简要介绍了安全投资、安全效益及其关系。对某矿山企业的安全投入与事故损失情况进行了分析,并根据灰色系统理论中的灰色关联分析的步骤对该企业的各安全投资项目进行了分析,得出了与事故损失关联度最大的投资项目,确定了最佳投资方向。     

基于灰色系统理论的BOT项目风险评价研究

在全面分析BOT项目风险的基础上,建立了BOT项目风险评价指标体系。由于在BOT项目风险评价指标体系中,有些指标评价信息不完全,具有灰色性。考虑到这一特点,采用灰色系统理论的评价方法,把BOT项目看作一个灰色系统,力求准确地评价BOT项目所面临的风险,为BOT项目决策提供依据。     

项目管理模式选择的系统评价与决策

重点讨论项目管理模式的评估理论与方法，并提出了多层次灰色理论的项目管理模式选择的综合评价模型及评价程序及方法。     

投资项目评价中通货膨胀因素处理方法的探讨

通货膨胀对投资项目评价影响重大，本文就如何处理投资项目评价中的通货膨胀因素进行了探讨．     

基于全生命周期的科技计划项目过程管理评价体系构建

基于全生命周期的视角,建立了科技计划项目过程管理的评价指标体系,并运用模糊综合评价和多层次灰色综合评价,对江苏省科技厅验收的5项科技计划项目进行了实证研究.对两种评价结果进行了分析,证明了评价指标体系的科学性和合理性,而且多层次灰色综合评价是一种更有效的科技计划项目过程管理评价方法.     

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.     

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.     

A computer generator for randomly layered structures

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

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to