自然圣境的生态保护功能及其实现路径

自然圣境是对人类具有特殊精神意义的自然区域,自然圣境除了具有精神文化价值,在生态环境保护方面也发挥了重要作用。自然圣境的生态保护功能主要体现在保护生态环境和自然资源以及为珍稀濒危物种提供栖息地。目前,因旅游和工程项目过度开发、土地利用变化、所属权转移、价值观念的变化和自然环境变迁等因素,造成自然圣境的生态保护功能面临挑战。面对这些问题,应加强对自然圣境及其生态保护功能的正确认知,将自然圣境纳入保护地和生态补偿体系当中,发挥自然圣境生态文化的灵魂作用,并制定与自然圣境保护相关的法律法规。     

Measuring the effectiveness of US monetary policy during the COVID-19 recession

The COVID-19 recession that started in March 2020 led to an unprecedented decline in economic activity across the globe. To fight this recession, policy makers in central banks engaged in expansionary monetary policy. This paper asks whether the measures adopted by the US Federal Reserve (Fed) have been effective in boosting real activity and calming financial markets. To measure these effects at high frequencies, we propose a novel mixed frequency vector autoregressive (MF-VAR) model. This model allows us to combine weekly and monthly information within a unified framework. Our model combines a set of macroeconomic aggregates such as industrial production, unemployment rates, and inflation with high-frequency information from financial markets such as stock prices, interest rate spreads, and weekly information on the Fed's balance sheet size. The latter set of high-frequency time series is used to dynamically interpolate the monthly time series to obtain weekly macroeconomic measures. We use this setup to simulate counterfactuals in absence of monetary stimulus. The results show that the monetary expansion caused higher output growth and stock market returns, more favorable long-term financing conditions and a depreciation of the US dollar compared with a no-policy benchmark scenario.     

基于工作过程的《市政桥梁工程施工》课程开发与实践

基于工作过程的课程教学充分体现了高职教育的特征,已成为职业教育改革的方向。以《市政桥梁工程施工》课程为例,针对该课程的现状进行分析,从教学体系、教学方法、考核制度等方面进行了开发与实践。     

Combining ecological and recreational aspects in national park management: A choice experiment application

Increasing pressure to diversify development of national parks emphasizes the need for new and relevant information for park management decisions. In this paper, we use choice experiment to value different tradeoffs that evolved in park development scenarios. Specifically, we examine which kind of development profiles are worth considering and which paths not to follow. We focus on biodiversity and recreational services provided by Oulanka National Park in Finland, which represents a popular recreation site attracting a large number of visitors. The increase of biodiversity was the most highly valued feature by the respondent national park visitors. Thus, our results show that the protection of biodiversity and recreational and tourism use of national parks can cause conflicting welfare effects if managed in inappropriate ways. Increasing the number of visitors, expanding present resting places, constructing new resting places and an intense increase in information boards, especially if combined with shrinking biodiversity, are welfare reducing managerial actions in national parks.     

疫苗药物经济学评价中有关成本和效果的测算方法探讨

与一般药物相比,疫苗具有外部性、保护率和作用时间不确定等特性,因此疫苗的经济学评价应当有其特殊性.本文回顾了近十几年世界有关疫苗经济学评价的研究报道,综合概括了疫苗经济学评价方法的最新进展.本文讨论的主要内容包括间接成本法、边际成本法、选择合适流行病学模型测量健康结果、成本和效果的贴现等.     

传记式资料测量：人力资源甄选的一种方法

本文主要对传记式资料测量的理论基础和传记式资料问卷的开发程序进行了系统描述，并分析了该方法在甄选中的实施效果。     

Towards a kernel theory of external knowledge integration for high-tech firms: Exploring a failed theory test

Designing information systems (ISs) requires a thorough understanding of the organizational knowledge processes in which these systems are used. Although much is known about internal organizational knowledge processes, the understanding of external knowledge processes is less developed. Hence, this paper reflects an attempt to operationalize and test a model of the process of external knowledge integration (EKI), consisting of an identification, acquisition, and utilization stage. We utilize high-technology based firms from a variety of high-tech categories including nanotechnology based firms since these firms have critical knowledge integration needs. The results of an international survey, with responses of 317 high-tech companies, suggest that not these three EKI-stages, but four organizational effectiveness functions (goal attainment, pattern maintenance, adaptation, and integration) account for most variation in responses. These findings seem to imply that ISs that are to support the EKI-process should be designed according to organizational effectiveness functions rather than to EKI-stages. It is proposed that each organizational effectiveness function imposes different requirements on ISs because users interact differently with IS in each function.     

中国货币政策传导机制分析——利率渠道的实证分析

市场经济条件下，在发达的货币市场和有效的金融机制基础上，货币政策主要通过利率、汇率、非货币资产和信贷传播四条途径影响宏观经济总量。本文重点通过对利率传导渠道的实证分析，说明中国由于利率管制等方面对货币政策传导的阻滞作用，中央银行的货币政策意图不能有效地指导实体经济，进而对疏导货币政策的传导机制提出对策建议。     

增强高校“两课”教学实效性的对策思考

当前,高校＂两课＂教学失效现象日益凸显。针对＂两课＂教学现状,应探究其失效原因,秉承教育观念和教学思想不断改革与创新的精神,提出进一步改进高校＂两课＂教学的有力措施,以增强高校＂两课＂教学的实效性,使其真正发挥出应有的教育功能。     

Equity market neutral hedge funds and the stock market: an application of score-driven copula models

In this article, we study the time-varying market neutrality of equity market neutral hedge funds. We use data from the Hedge Fund Research? Equity Market Neutral Index (HFRX EH), which represents the performance of a portfolio of individual equity market neutral hedge funds. For each day, we measure different levels of association of the Standard and Poor’s 500 (S&;P 500) index and the HFRX EH. We use non-linear dynamic conditional score models of location, scale and copula that, to the best of our knowledge, have not yet been applied in the body of literature on hedge funds. We study whether the neutrality of the HFRX EH that is evidenced in the body of literature for the period of April 1993–April 2003 also holds for the following decade, for the period of May 2003–December 2016. We estimate different average levels of association for the pre-, during- and post-periods of the US financial crisis of 2008. We find that the association of the S&;P 500 and the HFRX EH, on average, is significantly positive for the pre- and post-periods of the financial crisis, and it is significantly negative for the period during the financial crisis.