网络效应下的企业横向兼并与价格竞争

基于Salop圆形城市模型，研究了网络效应环境下企业横向兼并的动机及其社会福利，讨论了兼并对企业价格竞争行为的影响。结果表明，网络效应环境下，企业普遍具有兼并 动机，未兼并在企业竞争中始终处于相当不利的地位，当网络效应很强时，未兼并企业将被逐出市场，兼并企业成为市场的垄断厂商，通过对企业兼并前后社会福利的分析发现，当网络效应较强时，即使未兼并厂商被逐出市场，市场形成垄断，社会福利仍会改善。因此，政府应放宽对存在网络效应的行业中企业兼并的管制。     

上游市场进入的企业兼并动态博弈模型

构造了上游双头垄断，下游多厂商的产业结构模型，研究了上游在位企业面临进入威胁时的兼并模式选择．发现兼并战略选择取决于下游企业的数量及上游市场进入成本；即使不考虑规模经济，一定条件下，横向兼并仍是企业的均衡战略．揭示了政府和企业兼并方式中的利益冲突关系．     

有政府干预的市场经济条件下的福利最大化问题

初步研究了有政府干预的市场经济下的福利最大化问题,建立了相应的数学模型,并指出在一定的条件下,既可社会福利达到最大,又可使消费者的个人效用达到最优,最后给出了相应的经济含义及分析,并指出我国市场经济条件下的福利最大将优于完全竞争条件下的福利最大点。     

企业“双能力”视角下的政府干预与垄断福利

企业经营不但要应对市场的挑战还要应对政府的干预．从经济福利的角度看,企业应对市场的过程会促使企业生产出更多更好的产品和服务并不断扩大市场规模,企业应对政府则会形成资源配置的扭曲乃至腐败．但是,在企业间的竞争过程中,企业为了获取最大的利润而不得不拿出一部分资源来应对政府．反之,在垄断的条件下,企业则可以全力应对市场．本文构建了企业“双能力”视角下的竞争博弈模型,例证分析表明在有政府干预的条件下,垄断会带来更高的经济福利．     

开放经济环境中的横向兼并

为了深入了解我国加入WTO对国内市场的冲击,在开放经济环境中利用对策论和微分技术手段,分析了贸易政策的调整和在不同贸易模式下的横向兼并对多方经济利益的影响。结果表明：产业特征不同,贸易政策调整和企业横向兼并行为产生的社会效应不同,因此,政府在进行贸易政策和干预企业购并活动时,应充分考虑其所在的经济环境和产业特征。     

国际贸易中的最小质量标准研究

提出最小质量标准(MQS)作为贸易技术壁垒(TBT)来考虑，因为贸易技术壁垒的实质就是设定一个高于进口产品质量的标准，以阻碍进入．在此前提下，根据当前企业所遭遇的贸易技术壁垒的实际情况，考虑了在一个开放的经济体中，在两个国家生产技术非对称的情况下．技术的非对称对于企业利润的影响以及国内外企业的利润及社会福利随MQS的变化情况．研究结果表明．当政府设定MQS，国外企业的利润增加，本国企业的利润减少，但消费者剩余增加，且消费者剩余的增加幅度要大于本国企业利润的减少，故社会福利增加．因此，政府有动机设定MQS．     

中国传媒业投融资策略政府决策的博弈分析

在我国，传媒业具有一定的特殊性．在全球化条件下，对内对外开放是必然趋势．有鉴于此，该文首先运用博弈的研究方法分析了在封闭环境和开放环境下传媒业引入外部投资者的必然性；其次，针对不同的投资主体的资金分配决策问题构建了博弈模型，分析了传媒业发展的不同阶段引入外部资本程度的不同；最后，对于中国传媒业投融资策略政府决策提出了建议，认为应该实现资本规模的有效配置、创造外部投资者介入的良好运行环境、实施差异化策略．     

开放条件下国企改革中国有股份最优比重问题研究

在开放条件下，给出了国有企业、私有企业和外国企业开展古诺竞争的基本模型，讨论了国有企业中国有股份比重的变动对均衡社会福利和均衡政府支付的影响，进而得到了一些有益的结论.     

试析当前我国国有资产重组过程中的行政干预问题

在我国，资产重组的的方式有两种，一是市场交易，二是行政划拨。靠行政划拨实现企业资产重组，是政府通过行政干预，促成企业间资产重组，重组速度快，见效快，是我国近几年来资产重组普遍采用的方式。但靠行政划拨实现资产重组，违背了市场经济原则，给国有企业资产重组也带来一定的负面影响。１政府的多重身份导致了重组中的利益错位和利益冲突。资产重组从本意上讲属于资本经营的范畴，是市场交易行为，应该通过市场调节实现其重组过程，重组的主体是企业。但在我国目前条件下，政府成为资产重组的重要主体，政府作为金融管理者，希望通过剥离清理银行不良债权，有效控制并化解金融风险，使国有银行摆脱历史包袱；政府作为国有企业所有者，所关心的是能否尽快摆脱企业的高负债率，实现扭亏增盈。对于地方政府而言，则更关注某个企业重组时对本地区经济和社会的影响，而很少关心重组所包含的对国家宏观金融改革和企业改革的意义，这种多重身份导致的利益错位和利益冲突，使政府在企业重组中很难保持政策的协调性和连惯性，使重组后的企业潜在风险进一步扩大。首先是重组企业自身的风险加大。绝大多数兼并自身的负债水平很高，无论是承债式兼并还是出资收购企业控股权，其负债比例都会大幅度提高，加之...     

浅议我国社会福利社会化中政府的责任与地位

我国在计划经济阶段建立起来的传统社会福利制度在改革开放之后已经不能适应时代的变化和满足人民的要求，在此背景下，民政部门提出了“社会福利社会化”的改革道路并且取得了一定的成就。但是，由于我国的国情与市场的特殊性，文章认为社会福利社会化必须要在明确和加强政府的主导地位的条件下，由政府协调责任主体之间的关系，才能解决好社会福利社会化的问题。     

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…     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.