Hydraulic Reliability Designing Methods of Gas-Transport Network under High and Medium Pressure

This article analyses the hydraulic reliability of gas -transport network under high andmedium pressure in detail, To increase the hydraulic reliability, it is available to improve the send outpressure in permissible condition.     

Japanese service sector multinationals and the hierarchy of Pacific Rim cities

The explosive growth of Japanese service sector activities overseas since 1985 has had a significant impact on Pacific Rim cities. However, previous accounts of Japanese direct foreign investment in services have been constrained by official statistics which provide comparative information only at a national level. This paper uses establishment level data to assess changes in the spatial patterns of Japanese service firms among 35 cities as well as changes in the hierarchy of cities in the Pacific during the years 1985 to 1995. The period saw important changes in Japan’s economy such as the emergence of a ‘bubble economy’ up to 1990 and domestic recession after that. The results show the importance of Hong Kong, Singapore and Los Angeles as centres of Japanese service firms. However, the analysis indicates that a shift occurred in Japanese service sector focus over the study period, across the Pacific Rim from North America and Oceania to cities of the Asia-Pacific region. Along with that shift the concentration of services in just a few cities has remained unchanged, even though some new cities have emerged in importance.     

The Influence of Interest RateReduction on the Real Estates

The fluctuation of interest rate may affect the market of real estate.In Oct. l997,the central bank declared the interest rate reduction.This will promote the investment in the field of real estate,on the other hand,the developers' interest burden will be reduced as well.Thus,the cost of building will be declined and its price also will fall.At present,if we want to stir the real estate market,the overstocked buildings must be sold .The decline of interest rate makes the goal possible to reach.     

Some Properties and Model of the Efficient Margin in Portfolio Combinatorial Investment

This paper proves some properties of the efficient margin in portfolio combinatorial investment and presents a methematical model for calculating the optimal weighted vector of portfolio combinatorial investment     

我国林业再生产系统的灰色控制研究

通过对我国林业再生产系统的灰色控制研究指出：我国林业保持良好发展的合理投资比例应占产值的１５％以上,并通过计算分析得到,影响林业发展的主要因素是投资不足,这应引起足够的重视。     

关于风险型投资项目的经济分析

在阐述目前投资项目经济分析中存在问题的基础上,探讨了风险贴水率的定值问题,并结合实例给出了风险型投资项目的ＮＰＶ分析法。     

内蒙古扶贫项目综合经济效益研究——喀喇沁旗扶贫资金投入情况分析

简要介绍我区贫困地区的分布状况,近年来扶贫资金的投入情况以及我区扶贫开发的主要目标。喀喇沁旗是全区３１个固定贫困县之一,在我区５０个贫困县当中只是一个点,但具有一定的代表性,通过对该旗近年来扶贫开发情况的对比分析,可以看出我区扶贫开发工作的成效是显著的。     

合理施肥中投资风险预测研究

在合理施肥确定边际利润率值〔１〕的基础上,应用数学方法给出一种确定投资风险预测阈值Ｋ的方法。根据阈值Ｋ可预测施肥投资风险的大小。肥粮价格比例失调是造成投资风险过大的主要原因,本文通过计算机模拟可以计算出适宜的肥粮价格,为市场宏观调控提供可行性建议。     

农业持续发展中投入的合理利用问题探讨

分析了农业持续发展过程中投入的合理利用问题,提出了促进投入合理利用的几点建议。     

综合节能拖网渔船的经济分析

对综合节能拖网渔船与常规拖网渔船的净现值和投资回收期进行分析比较,并得出在一定情况下综合节能渔船具有较好的经济性。