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王晨 《中国高新技术企业评价》2010,(6)
安阳钢厂高炉煤气洗涤水处理站外供循环泵房安装水泵均为单级双吸式填料轴封离心泵。由于所供液体是浊循环澄清水,不仅浓缩倍数高而且有毒、有腐蚀性,密封填料经一段时间的使用后,当水泵停转就不能保证不向外泄漏液体。文章阐述几种软管的合理使用案例,旨在对相关人员提供参考。 相似文献
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王晨 《中国高新技术企业评价》2010,(4):182-184
安阳钢厂高炉煤气洗涤水处理站外供循环泵房安装水泵均为单级双吸式填料轴封离心泵。由于所供液体是浊循环澄清水,不仅浓缩倍数高而且有毒、有腐蚀性,密封填料经一段时间的使用后,当水泵停转就不能保证不向外泄漏液体。文章阐述几种软管的合理使用案例,旨在对相关人员提供参考。 相似文献
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我国中小企业信用担保机构是专门经营和管理信用风险的机构,其对资金的倍数放大作用同时也是对风险的放大.担保风险能否被有效地防范与控制关系到信用担保机构的可持续发展.信用担保机构的内部风险控制是防范担保风险的重要途径之一,文章结合COSO风险管理框架探讨了我国信用担保机构内部风险控制. 相似文献
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我国中小企业信用担保机构是专门经营和管理信用风险的机构,其对资金的倍数放大作用同时也是对风险的放大。担保风险能否被有效地防范与控制关系到信用担保机构的可持续发展。信用担保机构的内部风险控制是防范担保风险的重要途径之一,文章结合COS0风险管理框架探讨了我国信用担保机构内部风险控制。 相似文献
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我国中小企业信用担保机构是专门经营和管理信用风险的机构,其对资金的倍数放大作用同时也是对风险的放大。担保风险能否被有效地防范与控制关系到信用担保机构的可持续发展。信用担保机构的内部风险控制是防范担保风险的重要途径之一,文章结合COSO风险管理框架探讨了我国信用担保机构内部风险控制。 相似文献
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Previous studies of shareholder rights plans (poison pills) have emphasized short-term valuation effects in the context of specific takeover attempts. This paper analyzes rights largely adopted in ‘neutral’ environments. Using a paired-case control approach, differences between rights and non-rights firms are examined. Positive long-term valuation effects are associated with restructurings, while negative performance is associated with ownership/control influences. The evidence supports a multiple signalling model in which investors use subsequent information to revise probabilities concerning control preferences of management and directors. 相似文献
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Although control variables are the reason for multiple regression, surprising little attention is given to the process of locating and selecting the controls. If important controls are omitted, estimates can be biased and inconsistent whereas using too many controls can reduce efficiency and mask effects. We advocate a much broader search for controls than is customary, at least in the crime literature, and then the use of the general‐to‐specific methodology to select the relevant controls. We illustrate this procedure using a fixed effects panel data design evaluating the effect of legalized abortion on crime. 相似文献
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When multiple durations are generated by a single unit, they may be related in a way that is not fully captured by the regressors. The omitted unit-specific variables might vary over the durations. They might also be correlated with the variables in the regression component. The authors propose an estimator that responds to these concerns and develop a specification test for detecting unobserved unit-specific effects. Data from Malaysia reveal that concentration of child mortality in some families is imperfectly explained by observed explanatory variables, and that failure to control for unobserved heterogeneity seriously biases the parameter estimates. 相似文献
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由于物资运输面临很多的影响因素,因而也构成了影响市政工程项目施工中的重要外生变量。通过解构项目施工的特点,其呈现出工程施工量较大、工程施工进度快、工程环保要求高等多个要点。在此基础上的分析表明,在应用中需围绕着:分析市政工程项目施工具体要求、推进物流供应链横向联盟的形成、优化物流供应链管理中的衔接性,以及管控物流运输环节中的环保质量等方面来进行。 相似文献
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Holm's (1979) step-down and Hochberg's (1988) step-up procedures for tests of multiple hypotheses are simple to apply and are widely used. Holm's procedure controls the familywise error rate (FWE), while Hochberg's is more powerful. This paper investigates a step-down procedure (labelled CS) of Seneta & Chen (1997) which is a sharpening of Holm's, takes into account the degree of association between test statistics, and also controls the FWE. Computation for the CS procedure may be minimized by using the procedure as an adjustment to Holm's. The computational steps are detailed, and the adjustment is then illustrated by an application to a text-book example of multiple comparisons, in which step-wise procedures are shown to perform better than the usual Tukey T -comparison. Simulation investigations in a standard comparison with a control setting show that the CS step–down procedure is more powerful than Hochberg's step-up procedure and the procedure of Simes (1986), especially in regard to error rate, and not much less powerful than an optimal, but very specific, step-up procedure of Dunnett & Tamhane (1992). 相似文献
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有效的知识转移对IT外包项目的成功具有重要意义,也在促进IT外包服务提供商团队能力成长方面发挥着重要作用,然而现有文献对IT外包项目中知识转移的影响因素还缺乏系统的理论分析和实证研究。IT外包项目中的知识转移涉及范围广、因素复杂,具有很强的情境依赖性,鉴于此,本文基于IT外包服务提供商的视角,通过多案例的实证研究,识别、归纳出了影响知识转移的关键因素,包括四个方面、9个变量,分别是:IT外包服务提供商因素(团队人格特质、团队氛围、吸收能力、获取意愿)、客户方因素(客户方支持)、双方互动因素(沟通、和谐关系)和控制机制因素(正式控制、非正式控制)。本研究形成的整合概念模型丰富了IT外包研究和知识转移研究领域的成果。 相似文献
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随着我国市场经济体制的不断改革以及与世界经济的逐步接轨,如何依据国家外汇管理法规有关规定,建立高度集中的境外资金管理体制和运行机制,实现"统筹运作、保证需要;集中监管、确保安全;统一调度、提高效率"的境外资金管理要求,取得最优的管理模式,成为跨国公司境外财务管理的重点。本文主要就石油企业跨国公司相关境外承包工程项目的资金管理模式和具体内容结合本人在国际项目的经验谈谈石油跨国公司如何对境外资金进行有效的管理。 相似文献
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Transport costs, intermediate goods, and localized growth 总被引:4,自引:0,他引:4
Uwe Walz 《Regional Science and Urban Economics》1996,26(6):671-695
This paper presents a dynamic, two-regional, general equilibrium model in which interregional production and trade patterns are endogenously determined. Localized growth stems from the geographical concentration of an industrial sector exhibiting permanent productivity increases. Geographical concentration is a result of the interaction between local market size and local competition in the differentiated input industry. Regional factor endowment with an immobile factor is decisive for the long-run specialization, trade and growth patterns between the regions if large endowment differences prevail. With equal-sized regions, multiple equilibria exist. Furthermore, we argue that integration might lead to increasing regional concentration of production and innovation. 相似文献
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本文认为,内部控制中存在多重契约关系,内部控制的实质是对企业内部控制中的契约关系的控制,在明确契约观下内部控制关键点的含义、找出内部控制的各个关键环节后,设计出了契约观下多重的控制机制。 相似文献