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离心式压缩机是在工业上应用非常广泛的一种动力机械,随着科学技术的进步,离心式压缩机的制造和设计水平都有了非常大的提高.本文对离心式压缩机进行了简单介绍,对其发展历史进行了回顾,在对现状进行分析的基础上对其未来的发展趋势进行了分析. 相似文献
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首先,本文对铁基催化剂的研究进行了讨论,主要包括铁一钻型催化剂、稀土型催化剂以及亚铁型催化剂,对其研究发展历程进行了较为详尽的论述,并对其优点和应用范围进行了分析;接下来,又对钉基催化剂的研究进行论述,指出我国在这方面的相对不足,并对钉基催化剂研究结果与铁基催化剂的研究结果进行了比较。 相似文献
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以套管变形测井资料为基础,利用APDL编制有限元优化模块反演套变围岩力学参数,即可确定套变地层缺失的力学参数,又克服目前套管变形分析多是基于弹性模型,不能进行塑性变形分析的问题。同时在岩石力学参数反演程序中引入莫尔―库伦破坏准则,确定岩层内摩擦角与黏聚力、最大水平主应力和最小水平主应力之间的关系,使反演解具有唯一性。该方法为套变围岩岩石力学参数的确定提供了新方法,并较传统反演方法更为简捷高效。 相似文献
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认识和把握企业性质是研究企业收入分配的基础。基于对企业性质的一种新认识:企业是要素产权与企业产权之交易契约的履行过程,本文从企业产权(而非要素产权)的视角,诠释企业创立、生产经营、收入分配的企业产权逻辑,探寻企业收入分配及其形式的企业产权本质,构建一种四位一体产权公式:四类所有者(投资人、经理人、职工、政府),分别依据四类企业产权(直接价值产权、直接物质产权、个体间接物质产权、国家间接物质产权),索取四类企业收入(利息、薪金、工资、税收),研究企业收入分配合理化的测算依据,试图从理论上探讨不合理企业收入差距的根源,力图促进实践多视角地探索企业收入分配制度改革的新方案。 相似文献
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企业主体性产权理论的构建 --相关和自主统一的属性所有权 总被引:3,自引:0,他引:3
企业是市场经济活动的主体,应该具有其主体属性,并且正是其主体属性决定它的主体地位和作用,并形成主体性产权。但是,学术界缺乏对这个问题的研究,主要是因为受西方经济学传统的限制,要突破这种限制必须把经济学与管理学结合起来进行研究,以构建企业主体性产权理论。企业主体性产权是其相关属性产权与自主属性产权的统一。企业相关属性及其产权是基础和结果,主要说明企业主体性产权的共性;企业自主属性及其产权是原动力和境界,主要说明企业主体性产权的个性。它们的互补和统一突出地体现在企业家及其产权上。企业主体性产权的目的是在防止“蛋糕”缩小的同时把“蛋糕”做大,其核心是基于相互关系的约束而进行自主创造的激励,其模型的运行特点是协同一自主创造。企业主体性产权理论的应用,可以保证和促使中国企业循着超越自然历史发展。 相似文献
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科学甄别企业知识产权能力影响因素是有效提出知识产权能力提升对策的重要前提。本文从知识产权资金配置、知识产权组织和人员、知识产权制度建设、知识产权对外联系、知识产权外部环境5个层面构建企业知识产权能力影响因素理论模型,运用结构方程模型对问卷调查的数据进行验证。研究结果表明,知识产权资金配置和知识产权制度建设是企业知识产权能力的关键正向影响因素,知识产权组织和人员对企业知识产权能力的作用受到其它因素的影响,知识产权对外联系在不同情况下对企业知识产权能力影响的性质有所不同,知识产权外部环境对知识产权能力具有反向作用。 相似文献
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The incidence of local property taxes, specifically the degree of capitalizing of property tax differentials in market prices, remains an unresolved question. The studies by Oates (1969) and McMillan and Carlson (1977) , which come to contradictory conclusions typify the diversity of opinion on the question. Many of the previous studies suffer from research design problems including, the use of census data for market values and property tax levels on real property; failure to control for differences in public services quality among the cities samples; and use of assessed value as a proxy for market price. A theoretical model in developed to explain the capitalization effect of property tax differentials within an urban area. Because the model is exactly identified, a single reduced from equation relating market value to a set of physical characteristics of the property and the level of property taxes can be estimated using ordinary least-squares techniques. The function is estimated using data drawn from 107 residential property sales made during 1976. Estimated parameters for the other equations then are determined indirectly. Actual market price and property tax data for each parcel ware used. It is found that property tax differentials on otherwise comparable properties are associated with significant market value differentials. Because the assessed value ranges from 7 to 20 percent of market value, the property tax procedure in the area studied appears to have randomly generated large capital gains for some and capital losses for others. Because of the limited data base, the statistical results are only indicative; the model, howevfer, should have wide applicability in a variety of questions concerning the incidence of property taxes. 相似文献
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Because fees for property management services are based on gross rental collections rather than on net operating incomes, property managers may not always act in the best interest of property owners. This study is an examination of the agency costs that result from the conflict of interests between owners and managers. A nationwide proprietary sample of 242 apartment properties is analyzed to compare agency costs of four distinct types of ownership structures. Agency costs, measured as operating expenses per square foot, are found to be significantly higher for institutional owners than for noninstitutional owners, but not significantly higher in cases where no competition for property management services exists. We conclude that agency costs of property management contracts are significant and the fee provisions of standard property management contracts should be changed to better align the interests of managers and owners. 相似文献
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城市社区物业纠纷严重影响社会和谐与稳定。物业公司与业主之间市场交换活动,实质是一种市场契约的缔结、达成过程,二者是基于经济利益的市场契约关系。城市社区物业纠纷的经济学解释是,物业公司与业主市场契约缔结、达成过程中,双方实际市场地位不对等,物业公司强势垄断,业主缺乏投票选择权,政府隐形价格规制与物业公司形成利益同盟,业主集体维权遭遇"搭便车"。构建城市社区物业纠纷预防机制,从源头上防范物业纠纷发生,必须通过立法赋予业主更多权利,健全物业公司退出机制,建立业主集体维权激励机制,完善市场契约治理机制有效运行的制度基础,才能实现城市社区和谐、稳定。 相似文献
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国有企业产权制度改革路径及偏差 总被引:5,自引:0,他引:5
本文在试图突破现代西方产权经济学的基础上,提出了一个企业产权制度模型,推导出了企业产权制度的侵权性质,并以此为逻辑框架,对国有企业产权制度改革路径上的两个代表性的“节点”,即“放权让利”和建立现代企业制度进行了理论分析,认为国有企业产权制度改革,最成功的地方在于相对满足了企业私人产权的要求,最大的失误在于忽视了职工私人产权。如果职工私人产权不能随企业私人产权的扩大而扩大,国有企业产权制度改革就不可能取得成功。 相似文献
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Increasingly, manufacturing organizations compete by developing product-service systems rather than offering products alone. To transform themselves into providers of advanced services, however, product-centric manufacturing firms need to overcome a range of barriers. While previous studies have highlighted the teaching/learning potential of ‘gamification’ (the use of ideas and techniques found in game-playing), the opportunities to harness this approach to help tackle such barriers have yet to be fully realized. Our study extends the debate by integrating established frameworks relating to emotional mechanics of gamification with the adoption of advanced services, arguing that such mechanics can facilitate and strengthen companies' transformation into advanced-service providers. Based on a systematic analysis of nearly 90 selected publications, we develop six conceptual propositions to explore how gamification can aid the transformation process. Our findings will help both practitioners and researchers apply emotional mechanics of gamification when seeking to address different hurdles hindering the development and provision of advanced services. 相似文献