基于循环经济绿色供应链管理绩效评价体系的研究

循环经济是当前世界经济发展的主要方向,已被我国确定为今后经济的发展模式。本文根据绿色供应链管理的定义、内涵和循环经济"3R"原则,设计出基于循环经济绿色供应链管理绩效评价指标体系,即将绿色信息作为绿色供应链管理绩效评价的主要衡量指标之一,并将各个指标具体化,形成一个二级指标评价体系。根据指标体系的特点进行模糊多层次综合评价,最后给出一个算例进行说明,为基于循环经济的绿色供应链管理绩效评价提供了理论依据。     

绿色工艺创新扩散波动对经济增长的冲击

本文构建了一个两部门DSGE模型,同时考虑了创新扩散的一般规律(“S型扩散”)与企业绿色技术创新扩散的独特作用(节能作用和减排作用)。基于人口老龄化的预测,模拟随着企业绿色技术创新扩散的波动,经济系统所做出的响应。结果表明：经济变量对于企业绿色技术创新扩散的波动呈现出不同的响应路径,其中资本存量的响应具有滞后性；资本报酬率为首的相关经济变量对于正向冲击的响应出现了“翘尾效应”。最后,本文给出了稳定、正向引导市场预期和在资本市场采取预调机制的政策建议。     

站控PLC系统在天然气长输管线上的应用

根据陕西省天然气有限责任公司过去8年中使用PLC的经验,通过分析站控PLC系统的构成、软硬件配置、网络与通讯、应用程序的编制等,介绍了站控PLC系统在陕西省天然气长输管线上的应用.     

Hedging Housing Risk*

An unusually rich source of data on housing prices in Stockholm is used to analyze the investment implications of housing choices. This empirical analysis derives market-wide price and return series for housing investment during a 13-year period, and it also provides estimates of the individual-specific, idiosyncratic, variation in housing returns. Because the idiosyncratic component follows an autocorrelated process, the analysis of portfolio choice is dependent upon the holding period. We analyze the composition of household investment portfolios containing housing, common stocks, stocks in real estate holding companies, bonds, and t-bills. For short holding periods, the efficient portfolio contains essentially no housing. For longer periods, low-risk portfolios contain 15 to 50 percent housing. These results suggest that there are large potential gains from policies or institutions that would permit households to hedge their lumpy investments in housing. We estimate the potential value of hedges in reducing risk to households, yet yielding the same investment returns. The value is surprisingly large, especially to poorer homeowners.     

我国天然气专业技术标准的现状与设想

概括了我国天然气专业技术标准发展的现状，并通过与国际标准和国外先进标准比较，以及针对现场分析中存在的问题，提出了应采用完善《天然气专业标准体系表》，加快与国际接轨和“采标”的速度等办法来推动我国天然气专业标准化工作的发展。     

油气勘探投资项目评价指标的探讨

油气田勘探开发项目其技术经济特点不同于一般工业性项目，因其原油产量逐年递减，而收人也相对逐年减少，造成了项目单位成本逐年升高，利润指标逐年降低，文章就从油气田开发项目的一般生产规律和技术经济特点出发。初步研究了该类项目评价体系和基准值等相关问题，提出了初步的意见和建议，对决策工作能起到一定的作用。     

A Semiparametric Method for Valuing Residential Locations: Application to Automated Valuation

This paper is motivated by automated valuation systems, which would benefit from an ability to estimate spatial variation in location value. It develops theory for the local regression model (LRM), a semiparametric approach to estimating a location value surface. There are two parts to the LRM: (1) an ordinary least square (OLS) model to hold constant for interior square footage, land area, bathrooms, and other structural characteristics; and (2) a non-parametric smoother (local polynomial regression, LPR) which calculates location value as a function of latitude and longitude. Several methods are used to consistently estimate both parts of the model. The LRM was fit to geocoded hedonic sales data for six towns in the suburbs of Boston, MA. The estimates yield substantial, significant and plausible spatial patterns in location values. Using the LRM as an exploratory tool, local peaks and valleys in location value identified by the model are close to points identified by the tax assessor, and they are shown to add to the explanatory power of an OLS model. Out-of-sample MSE shows that the LRM with a first-degree polynomial (local linear smoothing) is somewhat better than polynomials of degree zero or degree two. Future applications might use degree zero (the well-known NW estimator) because this is available in popular commercial software. The optimized LRM reduces MSE from the OLS model by between 5 percent and 11 percent while adding information on statistically significant variations in location value.     

Hedging Housing Risk in London

This paper investigates the benefits of allowing households to compensate the portfolio distortion due to their housing consumption through investments in housing price derivatives. Focusing on the London market, we show that a major loss from over-investment in housing is that households are forced to hold a very risky portfolio. However, the strong performance of the London housing market means that little is lost in terms of expected returns. Even households with limited wealth are better off owning their home rather than renting and investing in financial assets, as long as they are willing to face the financial risk involved. In this context, access to housing price derivatives would benefit most poor homeowners looking to limit their risk exposure. It would also benefit wealthier investors looking for the high returns provided by housing investments without the costs of direct ownership of properties. Comparisons with French, Swedish and U.S. data provide a broader perspective on our findings.     

天然气甲烷值的计算方法及其标准化

天然气用作发动机燃料时，其抗爆性是一项重要指标。目前国外表示天然气抗爆性的方法甚多，但广泛应用的只有两个方法，即甲烷值(MN)法和辛烷值(MON)法。两者均以天然气的组成为计算依据，故相互间可建立换算的关联式。根据国内外的研究现状，提出了天然气甲烷值计算方法标准化的建议。     

上海股市五年综观

上海股市五年综观□张国枢，张开宇上海股市自１９９０年１２用１９日发布实施上证指数以来，至１９９５年１１月１７日，已运行了５后，作为我国的一个新兴资产市场，表现出极大的生命力租发展前景。其间，风风雨雨，涨涨跌跌，吸引了千万人的积极参与，为国内外各界人士...