高速铁路站台雨棚运维管理系统可视化监测E-BIM应用研究

高速铁路站台雨棚结构监测是保证列车行车与旅客候车安全的重要环节。为提高站台雨棚的运维管理与监测效率,针对高速铁路站台雨棚运维管理系统可视化监测进行设计,建立高速铁路站台雨棚运维管理系统可视化监测实施流程。以广州局集团公司海南环岛高速铁路海口东站站台钢结构雨棚为依托,引入基于BIM技术的E-BIM结构进行可视化监测,开发适用于大跨度空站台雨棚运维管理系统的可视化监测模块,实现高速铁路站台雨棚的结构风险管控,确保高速铁路列车与旅客的安全。     

基于 TCP/IP 的远程数字监控系统

根据美国国家经济研究局（NBER）的最新宣布,美国经济自2001年3月已经进入衰退。本文认为,美国此次衰退是难以避免的,这是经济周期的必然规律,由于此前虚拟经济与实体经济的发展脱离,形成泡沫,那些过剩的资本终究会退出,于是造成人们心理预期的过度反应,消费和投资需求出现大幅萎缩,而恐怖袭击事件则加速了衰退的进程。对中国而言,美国衰退的影响是利弊兼有,主要表现在出口、引资、经济格局等方面。     

Management of water bodies in show caves – A microbial approach

The aim of this study was to monitor factors affecting the microorganisms of water bodies in caves and apply the findings to improve their management. Four show-caves in Romania were sampled monthly to obtain an overview of the changes occurring in the fungal and bacterial communities of cave waters in relation to surface and underground impacts. Test plates were used for microbiological monitoring, alongside the recording of environmental parameters - physicochemical, drip rates, and number of both bats and tourists. A higher number of microbes were obtained during springtime and the summer tourist peak-season. None of the identified strains were cave-specific, and the presence of human-associated taxa was observed from all of the sites. A lack of significant correlation between the abundances of the microorganisms and the physicochemical parameters of the water emphasise the reliability of microorganisms as significant proxies for impacts on underground environments and their use in management decisions.     

Sustainable evaluation and verification in supply chains: Aligning and leveraging accountability to stakeholders

Managers are being challenged by multiple (and diverse) stakeholders, which have variety of expectations and informational needs about their firm’s supply chains. Collectively, these expectations and needs form a multi-faceted view of stakeholder accountability, namely the extent to which a firm justifies behaviors and actions across its extended supply chain to stakeholders. To date, sustainable supply chain management research has largely focused on monitoring as a self-managed set of narrowly defined evaluative activities employed by firms to provide stakeholder accountability. Nevertheless, evidence is emerging that firms have developed a wide variety of monitoring systems in order to align with stakeholders’ expectations and leverage accountability to stakeholders. Drawing from the accounting literature, we synthesize a model that proposes how firms might address accountability for sustainability issues in their supply chain. At its core, the construct of sustainable evaluation and verification (SEV) captures three interrelated dimensions: inclusivity, scope, and disclosure. These dimensions characterize how supply chain processes might identify key measures, collect and process data, and finally, verify materiality, reliability and accuracy of any data and resulting information. As a result, the concept of monitoring is significantly extended, while also considering how different stakeholders can play diverse, active roles as metrics are established, audits are conducted, and information is validated. Also, several antecedents of SEV systems are explored. Finally, the means by which an SEV system can create a competitive advantage are investigated.     

耕地质量监测预警研究进展

耕地质量是人类社会赖以生存与发展的物质基础,是农业发展的基本生产资料。为发挥监测预警体系在耕地质量建设中的主体作用,实现耕地质量的可持续利用,本文采用文献综述法和系统分析法综述了耕地质量监测和预警体系在国内外的研究进展,并着重对时间序列分析模型、灰色预测模型和回归分析模型三种耕地质量预警模型进行阐述。耕地质量监测预警体系具有实时、动态、全方位的监测与预警功能,对监测预警指标体系、方法、周期、模型和理论实践探究还需要进一步完善,同时还需要借助应用大数据,以期为耕地质量精准化监测预警提供实时的数据及模型支持服务。     

Local institutional shareholders and corporate hedging policies

This paper examines the effectiveness of monitoring function from institutional investors on corporate hedging strategy in Taiwan over the period from 2005 to 2012. The empirical results show that institutional investors are effective monitors of corporate risk management to enhance the probability and extent of hedging. In addition, the monitoring function from institutional investors is effective for mitigating the risk-shifting problem of high leveraged firms. Moreover, local institutional investors play more important role in monitoring distressed firm's magnitude of hedging than foreign institutional investors. These results are robust to the consideration of endogeneity, selection bias, and industrial difference. This is the first empirical evidence in the literature regarding the monitoring effect of institutional investors on risk management strategy from the angle of monitoring costs.     

A prospective analysis of labour market status and self-rated health in the UK and Russia

Comparing prospective data from the UK and Russia, this paper analyzes whether the association of labour market status, and particularly unemployment, with subsequent health varies by the level of state protection provided to the unemployed. While the UK's unemployment welfare regime is classified as providing minimal protection, the Russian regime is sub-protective. Employing Cox duration analysis upon data from the Russian Longitudinal Monitoring Survey and the British Household Panel Survey for the period 2000–2007, this study finds that labour market status and economic circumstances independently predicted individual-level declines in self-rated health and, contrary to expectations, the associations of unemployment with health decline were similarly sized in the two countries.     

Which institutional investors matter for firm survival and performance?

Using data that spans three decades, we assess the diverse roles of institutional investors in impacting survival and performance of chronically underperforming firms and contrast the results for consistently overperforming firms. We find material differences in investor roles and investment returns between these samples. Differentiating among institutional types, controlling for prior performance and attrition bias provides insights unattainable by examining aggregated holdings. For underperformers, results are negative for activist pension funds and long-term institutions, positive for activist hedge funds and short-term institutions, and mixed for institutional blockholders.     

一种面向智能变电站和生产管理系统设备在线监测的数据转换模型

在线监测是实现电网设备状态检修和生命周期管理的前提,而有效的设备数据转换模型是在线监测的基础。通过对智能变电站及生产管理系统的标准、规范进行分析,提出一种用于智能变电站和生产管理系统设备在线监测的数据转换模型。对生产管理系统的设备信息数据模型进行分类总结,基于交换用XML数据对生产管理系统和IEC 61850标准数据模型进行对比,对变电站设备的铭牌信息、运行信息以及监测信息采用标签映射与ID索引相结合的方法,实现智能变电站到生产管理系统的数据转换。     

经济欠发达地区民间借贷问题研究——基于桂林的样本数据

随着社会主义市场经济的发展,民间借贷现象逐渐被重视,而经济欠发达地区的民间借贷行为由于其鲜明的特点和运行机理尤其引人关注。本文以桂林辖区民间借贷为样本,在分析民间借贷现状、特征的基础上,试图探讨经济欠发达地区民间借贷的经济政策效应及监测体系,以达到为货币政策制定和执行提供参考的目的。