悬臂式掘进机回转机构的分析与建模

基于悬臂式掘进机回转机构的结构特点,对其液压控制系统的运行原理展开分析,并结合假设条件建立液压元件的基本方程,通过机理建模最后得到了系统的传递函数,为实现掘进机自动控制提供了实用的简化模型。     

机动车尾气污染危害的生成机理与治理发展

本文介绍了汽车尾气对人类健康和生态环境的危害,及其生成机理和影响因素并简述汽车尾气治理与发展。     

Turning corporate environmental ethics into firm performance: The role of green marketing programs

In this study, we develop a better understanding of the mechanisms by which corporate environmental ethics influences performance through the adoption of substantive actions. The empirical results of a moderated mediating analysis show that firms with higher environmental ethics are more likely to implement green marketing programs, consisting of the green production, pricing, distribution, and promotion programs and then improve firm performance. It is also observed that closure mechanism negatively moderates the mediation effect of green marketing programs because it leads to low trust and unwillingness to internal cooperation. These findings indicate that the value of corporate environmental ethics could not be determined in a vacuum, both strategy and people do matter when pursuing environmentally driven performance.     

金融稳定理事会的职能地位与运行机制分析

金融稳定理事会自2009年成立以来,在促进全球金融监管体系的改革与完善,推动国际金融监管标准的制定和执行方面开展了卓有成效的工作,现已成为在全球层面协调各国金融监管当局和国际金融监管标准制定者的重要机构。金融稳定理事会机制化运行主要表现在三个方面:义务性加大、约束力增强和授权性增加。在未来发展中,金融稳定理事会应进一步提升自身的代表性和决策机制的合法性,通过自身的影响力将国际金融机构和监管标准制定机构更紧密地联系起来,并进一步提升对成员国的影响力。     

Identifying the internal structure evolution of urban built-up land sprawl (UBLS) from a composite structure perspective: A case study of the Beijing metropolitan area,China

Differences in the internal composite structure during urban built-up land sprawl (UBLS) will generate different effects, and thus, a city’s spatial structure has important bearings on urban sustainability. This study investigates the spatial and temporal characteristics of the internal structure and allocation relationship of UBLS using multivariate spatial correlation and the Weaver-Tomas composite coefficient based on site data of granted built-up land parcels. Moreover, the composite structure evolution process of UBLS and its driving mechanism are examined in this study. The results reveal that the amount structure of the three types of UBLS (i.e. industrial land sprawl, residential land sprawl and commercial land sprawl) tended to be balanced during the study period. Following the transformation and upgrade of the urban industry structure, the overall composite structure of UBLS ranged from single residential land-use structure (Res.) to industrial-residential land-use structure (Ind.-Res.) In the early period of land marketization, the marketization land granting mechanism caused low spatial correlation between the various types of UBLS and a single composite structure, i.e. Res., single commercial land-use structure (Com.), and residential-commercial land-use structure (Res.-Com.). Subsequently, a dual-driving force including the market economy and government interventions caused a relatively high degree of spatial correlation and a multiple composite structure, i.e. Ind.-Res. and industrial-residential-commercial land-use structure (Ind.-Res.-Com.). However, the evolution characteristics of the composite structure in various regions illustrate some problems, such as the spatial isomorphism phenomenon of the composite structure and the dislocation of urban built-up land allocation. The urban internal built-up land spatial layout pattern is the embodiment of two dominant driving forces, the market and the government, interacting with each other according to natural and socioeconomic conditions. Therefore, we suggest that it is necessary to reform the future urban built-up land granting mechanism based on market guidance, and the composite structure of UBLS should be adjusted according to the regional function. The government should reinforce the macro-control of land-use planning for the dispersed granted land parcels so as to optimize the urban land-use structure.     

基于耦合协调度模型的南京市用水效率与经济发展关系

基于2007—2014年南京市用水效率与经济发展的时间序列数据,构建南京市用水效率系统与经济发展系统间的耦合协调度模型,探讨南京市在2007—2014年期间用水效率与经济发展之间的动态均衡关系。首先对用水效率系统和经济发展系统的综合状况进行评价,然后对两系统的耦合协调度进行定量分析。结果表明:2007—2014年南京市用水效率和经济发展水平都有大幅度增长;两者的耦合协调关系在波动中逐渐优化,2007年处于低度协调耦合阶段,2008年处于中度协调耦合阶段,2009—2014年处于高度耦合协调阶段;只有提高用水效率与经济发展并举,才能保持耦合协调度的增长趋势。最后针对用水效率系统和经济发展系统存在的不足,提出在用水效率方面优化用水结构、加强水质污染治理,经济发展方面则调整经济结构、增强经济活力等建议。     

Sources of business fluctuations: Financial or technology shocks?

Despite the widespread belief that technology shocks are the main source of business fluctuations, recent empirical studies indicate that in the absence of financial frictions, a shock to the marginal efficiency of investment is the main source and is closely related to financial conditions for investment. We incorporate a financial accelerator mechanism and two types of financial shocks to the external finance premium and net worth in a dynamic stochastic general equilibrium model with shocks to the marginal efficiency of investment, the investment-good price markup, and the rates of neutral and investment-specific technological changes. This model is estimated using eleven US time series that include data on loan, net worth, the loan rate, and the relative price of investment. Our estimation results show that the (non-stationary) neutral and investment-specific technology shocks primarily drive output and investment fluctuations, while the external finance premium shock plays an important role for investment fluctuations. This financial shock induced substantial falls and subsequent sharp hikes in the external finance premium and caused boom–bust cycles over the past two decades.     

基于多元结构的旅游供应链协调机制研究

根据组织协作观点与步骤选取了合适的协作者、协作要素；摒弃了旧有的供应链的唯一机制，运用包含服务、资料、金钱、知识的多样化机制合理地调整了旅游供应链；鉴于旅行社与政府在调整供应链上存在的不足，给出了微观与宏观相融合的协调机制；在分析当前旅游供应链中常见的折扣价格合约制度后，建立了全新的收入分配体系，目的在于鼓励提供旅游产品的供应者；在分析旅游供应链利得产品驱动模型后，给出了产品的推拉协调一致的模型。     

廉政文化建设与和谐社会建构互涵互动的内在逻辑：“同频共振”机理

廉政文化建设与和谐社会建构的关系并非单方向的，而是双向作用的机制。一方面，廉政文化建设有利于促进社会更好地走向和谐；另一方面，和谐的社会氛围反过来又为廉政文化建设的开展创造了良好的社会环境，和谐社会的构建对廉政文化建设起着逆向加强的作用。二者互涵互动、相得益彰，二者的关系可以形象地称为“共振”效应。“共振”之为“共振”，从根本上讲，乃在于二者是“同频”的，“同频”方能“共振”。正是因为二者的基本理念、价值取向、精神内核、追求目标是根本一致的，二者才能朝一个方向使劲，相互促进、相互加强，产生巨大的“合力”，这才是二者互涵互动的内在机理。     

酒店行业协会的运行机制及其变迁——以广州地区酒店行业协会为例

行业协会在酒店业发展进程中发挥越来越大的作用,但在国内现行条件下,行业协会发展面临多重困难。文章以广州地区酒店行业协会为案例,采用实地调查和深度访谈的方法,讨论行业协会的运行机制及其变迁。研究认为,第一,"政会不分"是目前行业协会管理的主要问题,政府应创新行业协会管理机制,加快"政会分开"的进程,推进部分行业职能向协会转移;第二,酒店行业协会应大胆创新,依据地区、行业发展环境动态调整组织架构,丰富协会职能发挥,以此达到激活协会运行机制的目标。基于此,酒店行业协会可以更好地为会员酒店服务,提升行业专业化管理水平。