我国环渤海地区港口物流竞争力评价研究

本文在研究港口物流及其竞争力内涵的基础上,建立了多层次港口物流竞争力评价指标体系,并采用了特尔斐法和模糊综合评价法对环渤海各港口的物流竞争力进行了综合评价。     

物流企业经济效益的综合评价

客观地评价物流企业的经济效益,对推动物流企业发展,提高企业经营管理水平有重要作用。本文对物流企业的经济效益评价指标体系进行设计并运用模糊综合评判方法进行综合评判。     

现代港口服务质量评价指标体系研究——以日照港为例

本文对现代港口的服务质量进行了定性和定量的分析研究,探讨了影响港口服务质量几方面的因素,建立了比较港口服务质量的评价指标体系,并以日照港为例,在调查问卷的基础上,对其物流服务质量进行了综合分析评价,对于各港口落实规范化管理、提高服务水平、实现港口服务现代化具有一定的借鉴意义.     

企业物流绩效综合评价的AHP-TOPSIS方法及应用

企业物流绩效综合评价的关键是怎样选择或建立评价模型,以及怎样根据评价模型建立评价指标体系.以企业物流绩效为研究对象,建立了一种较全面的二层次指标体系,综合考虑了客户、成本、服务水平、信息以及创新学习等各方面的绩效指标;利用AHP法确定一级指标和每个二级指标的权重,并对指标进行标准化处理.建立了AHP-TOPSIS评价模型;最后给出一个算例.     

港口物流竞争力评价方法研究

本文在研究港口物流及其竞争力内涵的基础上,通过对层次分析法,模糊综合评价方法和主成分分析法的比较,选择主成分分析法建立了多层次港口物流竞争力评价指标体系。对环渤海各港口的物流竞争力进行了实证研究。     

基于AHP模型与36O度的企业环境绩效模糊综合评判

为了客观准确评价企业的环境绩效,运用层次分析法(AHP)和360度绩效考核法设计了企业环境绩效指标体系,并对其进行指标权重的设定,运用多层次模糊综合评判数学方法对企业进行公正的评判.以一个企业为例给出具体步骤,为其他企业环境评价提供借鉴.     

物流企业供应链绩效评价体系的构建与应用——基于AHP法和模糊综合评价相结合的方法

借助SCOR模型的思想,从供应链的角度分析物流企业集团的业务,构建了与物流企业业务相适应并适合其发展的供应链绩效评价指标体系,并运用AHP法和模糊综合评价法对大型物流企业集团进行供应链绩效的综合评价,以便从供应链的总体角度全面、客观地评价物流企业的绩效。     

港口潜力评价模型构建——以福州港为例

为提升港口的竞争力,需要对港口的发展潜力进行评价。本文选取了影响港口发展的因素,构建港口发展潜力评价指标体系,将层次分析法（AHP）和多层模糊（Multi-LevelFuzzy）综合等级。选取福州港进行实证分评判相结合,确定各评价指标的权重,进而结合各指标相对各评价等级的隶属度,计算港口发展潜力的综合评价析,验证评价模型的正确性。     

散料港口物流系统的规划,综合评价及决策系统

研究了散料港口物流系统模拟技术及综合评价方法，建立了系统的模拟模型、系统综合评价指标体系，开发出用于散料港口物流系统规划设计、模拟分析、综合评价的决策支持系统、结果表明，该系统具有良好的决策可信度。     

铁路机车业供应链绩效研究

本文首先分析了铁路机车业供应链的特征、供应链绩效关键成功因素,然后利用平衡计分卡法建立了铁路机车业供应链绩效评价指标体系,最后运用模糊综合评价法对铁路机车业供应链绩效进行了评判和分析。     

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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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。     

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.     

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