股权集中度、债务融资与公司绩效——来自于四川省上市公司经验证据

以2008年至2012年四川省的上市公司为研究样本,考察了股权结构特别是股权集中度、债务融资和公司绩效三者之间的关系.结果显示,公司负债与公司绩效呈一种非线性的倒"U"型关系;而股权集中度和公司绩效水平则呈一种非线性的"U"型关系;与此同时,股权集中度和公司绩效显著正相关.此外,还发现股权集中度通过影响负债进一步对公司绩效产生作用.     

基于结构方程模型的公司治理对企业技术创新影响分析

通过治理结构变革来推动技术创新,是增进企业活力、改善绩效的重要途径。以公司治理结构对企业技术创新的影响为研究主题,运用结构方程模型,通过从股权结构、董事会结构、管理层激励以及资本结构等方面进行实证研究,得出结论:国有持股比例越高越不利于企业技术创新活动的进行;独立董事以及董事会规模对企业技术创新投资的影响不显著;股权集中度越高,技术创新的投资越高;管理层激励与技术创新的投资有明显的正相关关系;企业负债率与技术创新则有明显的负相关关系。相比回归分析的统计方法,结构方程模型可以同时处理多个因变量,同时容许自变量和因变量含测量误差,还可以估计整个模型的拟合程度,因而对结构方程模型的运用增加了研究结果的精准性和说服力。     

股权集中度、债务融资与公司绩效—来自于四川省上市公司经验证据

以2008年至2012年四川省的上市公司为研究样本,考察了股权结构特别是股权集中度、债务融资和公司绩效三者之间的关系。结果显示,公司负债与公司绩效呈一种非线性的倒“U”型关系;而股权集中度和公司绩效水平则呈一种非线性的“U”型关系;与此同时,股权集中度和公司绩效显著正相关。此外,论文还发现股权集中度通过影响负债进一步对公司绩效产生作用。     

上市公司股权结构与公司绩效关系-基于房地产行业上市公司研究

股权结构作为公司治理结构的产权基础,影响着公司外部治理机制的运作和公司内部治理机制的构成,并通过内外部治理机制对整个公司治理的效率发生作用,从而进一步影响公司绩效。我国上市公司股权结构很特殊,它与公司绩效有怎样的相关性？弄清这一问题有助于我们发现我国治理结构中存在的问题,同时也为如何优化我国股权结构、提高公司经营绩效提供参考建议。本文以我国房地产行业上市公司为例,用理论和实证分析相结合的方法,研究了后股权分置时代上市公司股权结构和经营绩效之间的关系,并提出政策建议。     

中国房地产上市公司治理状况与企业绩效关系评价

为了系统分析公司治理状况与企业绩效关系,该文结合新型资本市场的特点,以2001—2012年房地产上市公司为样本,运用因子分析法分别计算反映公司治理状况与企业绩效的合成指标,借助非参数检验和分组回归的方法研究二者的关系。研究表明:房地产上市公司治理状况与企业绩效显著正相关,改善公司治理状况能给企业带来丰厚的绩效回报。建议房地产上市公司重视改善公司治理结构,以有效提升企业绩效。     

电子电器行业上市公司的股权结构与绩效关系

以总资产收益率为被解释变量,以股权集中度和股权构成为解释变量,系统的考察了中国电子电器行业上市公司中股权结构与公司业绩的关系.实证分析结果表明:中国电子电器行业的上市公司股权高度集中且公司间实力很不均衡;股权集中度与公司绩效相关性不显著,国有股、法人股及普通股持股比例与公司绩效之间均不呈现显著相关关系.     

本土情境下股权集中度与技术创新绩效关系的再审视—— 一项元分析

股权集中度与技术创新绩效间的关系一直是公司治理的热点.为了进一步明确二者间的关系,揭示其边界条件,本文采用Meta回归方法,对57项实证研究的139个独立样本进行了归纳分析.结果表明:股权集中度与创新绩效之间存在微弱正相关关系,非线性关系并不显著;董事会结构、企业特征、外部环境在不同程度上对股权集中度与技术创新绩效之间的关系起调节作用;股权集中测量方式的不同不会在股权集中度与创新绩效的关系界定上产生显著差异;技术创新绩效评价方式下,采用R&D评价方式会产生明显偏差,而采用专利申请数和综合指标评价则较为稳健.     

从股权结构看我国上市公司股权融资偏好

传统的融资结构是指债务资本与股权资本的比例关系。融资结构理论的现有文献基本上都是以这种融资结构作为研究的现实背景。一般认为,我国上市公司的股权融资偏好是由于不合理的成本因素、有缺陷的监管制度与政策和低效的资本市场等原因造成的。本文从股权资本结构入手,比较了不同股权结构与融资偏好的关系,指出我国上市公司股权融资偏好产生的根本原因在于其高度集中的股权结构,并提出相应的治理对策。     

股改前后上市公司融资结构与公司绩效的研究——基于沪市A股上市公司的实证分析

本文主要通过实证分析,探讨了股改前后上市公司融资结构对其公司绩效的影响。通过建立模型进行逐步回归分析法,得出了两点结论。一是资本结构与公司绩效的关系：股改前,资产负债率与公司绩效相关性显著;股改后,资产负债率与公司绩效相关性不显著。二是股权结构与公司绩效的关系：股改前,股权结构的变量替代变量流通股比例和第一大股东持股比例与公司绩效相关性不显著;股改后,其与公司绩效负相关。股改前后国有股比例与成长性变量与公司绩效都不显著。而在股改前规模变量与公司绩效呈正相关,股改后规模变量与公司绩效呈负相关。     

旅游上市公司资本结构与经营绩效关系的实证研究

以深沪交易所的旅游上市公司为对象,利用2006-2010年面板数据,对公司资本结构与其绩效之间的关系进行分行业的实证研究.通过对样本数据的描述性统计和回归分析,发现旅游上市公司的资本结构与绩效之间并不存在显著相关关系.其原因在于"一股独大"的公司治理结构、代理问题、政府主导和旅游业发展的外部性.因此,旅游上市公司应适当减少国有控股比例,建立有效的监督和激励机制,并根据自身特点,合理权衡和选择融资方式.     

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.