建筑碳排放预测信息集成技术研究

BIM技术在建筑全生命周期碳排放预测中还未得到充分应用.本文首先根据建筑碳排放预测信息需求,提出建筑碳排放预测信息集成架构;其次,基于IFC标准与gbXML数据格式,建立集成的建筑碳排放预测信息模型CeData,并提出项目信息子模型CeData_Pro、热工分析子模型CeData_Ther、能耗监测子模型CeData_...     

Measuring liquidity with return volatility: An analytical approach based on heavy-tailed Censored-GARCH model

The measurement of liquidity based on low-frequency data is a crucial issue in the financial market microstructure literature. This paper extends the commonly used LOT liquidity model by incorporating the characterization of the volatility dynamics and distributional properties of return series, thereby significantly improving both the goodness-of-fit of liquidity model and the estimation performance of the existing low-frequency liquidity measures. The new models, which have a special form of heavy-tailed Censored-GARCH model, have challenges in estimation. We then provide an approximate maximum likelihood estimation method to circumvent this problem. A real data analysis is conducted to evaluate the performance of the new liquidity measures. The results show overwhelming evidence that our new measures have advantages over the existing measures in both estimation error and correlation coefficient with high-frequency bid-ask spread. The robustness check analysis further illustrates that the advantages of our new measures are stable across different stock industries and different turnover levels.     

Fractional cointegration and price discovery in Canadian commodities

Using as a unifying theme commodities important to the Canadian economy, recently developed tools are applied to studying price discovery in the spot and futures markets. For each commodity the fractionally cointegrated vector autoregression (FCVAR) model of Johansen and Neilsen is estimated and tested against the special case of the conventional cointegrated vector autoregression (CVAR). These models characterize the fundamental value of a commodity as the common stochastic trend shared by its cointegrated spot and futures prices, and so price discovery can be analyzed using the permanent-transitory decomposition of Gonzalo and Granger. Model forecasts are evaluated and compared using a distributional result due to Clark and West. The generalization to fractional cointegration is found to be statistically significant. However the economic significance of this generalization—in terms of forecast accuracy and the profitability of mean–variance dynamic trading strategies—is more fragile than may have been appreciated.     

基于快递物流业态的盈利模式研究

对任何企业而言,对利润的追逐是其永远不变的目的。有了利润,企业才有了长期生存和发展的权利。但具体到每一个企业,获得利润的途径却不一样,由此形成了不同的盈利模式。文中通过对中外快递物流发展现状的研究,探索了我国快递企业的盈利模式,分析了快递企业盈利模式存在的问题,在此基础上提出了我国快递物流的盈利模式。     

北京市知识产权运营模式分析

本文首先介绍了知识产业运营的含义和模式,讨论了北京市构建知识产权运营体系的必要性;其次,通过实地调研北京市知识产权运营企业和企业的内部知识产权管理实践,总结了北京市知识产权运营的主要模式;最后,分析了知识产权运营的构成要素,包括：技术评价网络、资源获取能力,业务领域、商业模式和外部环境,并提出企业是知识产权产业化的主体,政府需要适时提供引导和支持。     

Consumer acceptability of yellow maize products in Zimbabwe

This study analyzes consumers’ awareness of and attitudes towards yellow maize products in Zimbabwe and suggests intervention strategies that will ensure increased production and consumption of the crop, which is rich in provitamin A to help prevent the incidence of vitamin A deficiency prevalent among vulnerable groups. Data from 360 randomly selected rural and urban households show that yellow maize is known to all but few are aware of its nutritional qualities or consume it. The main source of supply is imported food aid. Rich in oils, carotenoids and fructose, yellow maize easily undergoes chemical changes to produce unacceptable organoleptic properties (or bad taste) if poorly handled during importation. These two factors are responsible for it being perceived inferior to white maize by consumers. Quality assurance during importation can improve consumer confidence but a long-term strategy will be to vigorously promote domestic production of yellow maize varieties rich in high levels of β-carotene that meet the preferences of consumers. Drawing from a probit model regression analysis, nutritional education can potentially promote yellow maize consumption, especially if targeted at low income households. Domestic production and consumption of yellow maize will decrease vitamin A deficiency among vulnerable groups and improve food insecurity through reduced grain prices and increased incomes for farmers. These results draw attention to the need for policy makers in developing countries to review their agricultural policies to ensure that they do not undermine the local production and consumption of nutritionally valuable crops.     

公共投资的区域经济增长效应

我国已把公共投资作为政府扩大内需,促进经济社会全面发展的重要手段,并已开始利用公共投资的扩张手段来实现经济持续稳定增长。文章运用计量经济方法,对我国在东、中和西部区域的公共投资对经济增长的效应问题进行分析。结果表明,东、中和西部区域的公共投资对各区域经济增长具有显著的正向影响。并且不同区域的经济增长效应存在明显的差别,其中西部区域的公共投资效应明显低于东部和中部区域。     

合资模式下中国汽车产业升级路径分析——基于产品内分工理论

在经济全球化的趋势下,中国的巨大市场吸引了一批跨国企业来华投资,中国的汽车企业通过和跨国公司合资,嵌入由其主导的汽车产品价值链中。从产品内分工理论的角度,对汽车产品分工各环节进行价值分析,指出战略环节,并对合资模式下的中国汽车产业升级路径的利弊进行分析,对升级路径提出建议。     

股权分置改革效应模型及实证分析

Based on the sample of 939 Chinese listed companies in the 40 former reformed batches, this paper investigates the effect of Chinese split share structure reform and its impact factors. First, considering Chinese split share structure reform as an event, an effect model is set up by means of the event study method, which takes abnormal return rate as a basic indicator to measure the reform effect. Further, in order to look for the impact factors on the reform effect, the empirical comparing analysis for different batches, different trading posts and different boards are done. These results show that the reform has positive effects on Chinese stock market and increases value of the listed companies. There is higher transformable return rate in the reform batches which include more Chinese listed companies with high quality performances. The shareholders who are in Shenzhen Stock Exchange market get higher transformable return rate than the shareholders who are in Shanghai Stock Exchange market. SME board has higher transformable return rate than the main board.