油气开采企业价值链数量模型及其实证分析

价值链分析是企业成本管理创新的一种新方法.以油气开采企业为研究对象,建立了油气开采企业行业价值链和内部价值链的数量模型,并进行了相应的实证分析.结果表明,油气开采企业价值链是由相互依存的价值活动构成的一个系统,这个系统中各个价值活动之间存在着优化空间.     

价值链视角下内部审计功能的探讨

价值链是指企业进行的一系列符合特定模式的活动,企业的价值创造是通过一系列活动构成的,这些活动可分为基本活动和辅助活动两类。价值链上的每一项价值活动都会对企业最终能够实现多大的价值造成影响。企业应具体分析本企业的价值链,查找增值空间大的活动重点关注。内部审计作为价值链中的辅助活动,它的价值通过价值链整体的价值增值来体现,本文通过分析内部审计的发展过程及其在价值链中的定位,指明内部审计在价值链中的作用,浅议在中国企业中影响内部审计功能实现的普遍存在的问题,提出相关改善建议,期待着能够为企业内部审计的建设作出一点贡献。     

价值链中项目采购方式对价值的影响

价值链在经济活动中是无处不在的,上下游关联的企业与企业之间存在行业价值链,企业内部各业务单元的联系构成了企业的价值链,企业内部各业务单元之间也存在着价值链联结.价值链上的每一项价值活动都会对企业最终能够实现多大的价值造成影响.     

我国企业实施价值链会计管理的路径刍议

价值链会计是为企业创造最大化的价值增值及其合理分配的一种管理活动,是知识经济环境下的产物。价值链会计的对象是价值链管理对象的数据化和具体化,即价值链信息及其所体现的经济关系,其表现形式是价值链,实质是价值链信息背后所体现的经济关系,核心是增值流。因此,本文通过对价值链会计理论与方法进行分析,来探讨如何将价值链管理思想落实到企业的管理活动中,以实现价值增值的最大化,创造企业各方利益相关者的共赢。     

拓展外部价值链系统,提升企业价值

现代企业完整的价值链系统是由内部价值链系统和外部价值链系统构成的一个有机整体。信息技术和网络技术使企业价值链系统向外拓展可以突破时间和空间的局限,因此拓展企业的外部价值链系统成为提升企业价值的新趋势。企业在对顾客价值、外包战略、战略联盟和品牌战略等外部价值链系统的拓展上有着巨大潜力。企业只有通过不断挖掘价值链系统的潜力才可在激烈的竞争中立于不败之地。     

基于价值链的企业战略分析

介绍了企业价值链及其价值系统,阐明了在企业经营中只有基于价值链进行战略分析,明确企业的竞争优势,才能确定企业的最优发展战略。     

挖掘企业价值链低端的价值增长点

价值链上的每一项价值活动都会对企业最终能够实现多大的价值造成影响[2]。进行价值链研究目的就是帮助企业在价值链上开拓与其他企业不同的差异优势,从而保证企业的市场竞争能力。本文首先介绍了价值链的基本概念,提出价值链低端的研发意义,然后在零售企业的渠道价值链中去挖掘价值链低端的价值,并分别给出了一些具体的开拓方法和手段。阐明了只有在被竞争对手忽略的价值链低端领域去开拓,才能保证企业的市场竞争优势,从而实现企业价值最大化。     

创新价值链：内涵、结构及中国情境研究

在创新价值链理论溯源和概念应用分析的基础上，对创新价值链的内涵辨析，构建包括创新过程、创新价值形态的创新价值链整合结构。对比产业价值链，发现全球产业分工逐渐升级为创新分工，创新价值链的全球化分工在很大程度上决定未来全球价值链分工。分类研究了企业创新价值链、区域创新价值链、产业创新价值链的结构，包括创新动机、创新行为、创新价值传递和创新价值分布。结合中国情境和国内外研究现状，提出未来聚焦创新价值传递、创新价值转换和创新价值分配研究的建议。     

企业电子商务的价值实现浅析

当前,企业在经营活动的许多环节广泛采用电子商务技术。企业电子商务如何实现自身的价值,关系到企业的经济效益。运用价值链分析的方法,可以得出企业电子商务主要是通过缩短渠道、增加知识价值和提供服务来实现自身价值的。     

人力资本价值链系统分析及其管理演进

企业价值的保值与增殖与人力资本作用的发挥密不可分.人力资本作用的发挥依赖于特定的组织环境,并通过其相互之间的作用关系推动企业价值的实现.文章从系统的角度理论分析了人力资本在价值创造过程中所形成的层级式价值链、并列式价值链和网络化价值关系,并根据环境的变化,其管理及其形式的动态调整.     

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

<正>~~     

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