世界乙烯、三苯及苯乙烯市场预测

预测了世界乙烯、三苯（苯、甲苯、二甲苯）及苯乙烯２０００～２０１０年的盈利性、价格及供需形势。     

我国债券市场流动性实证分析

对债券的流动性指标在上海证券交易所债券市场、银行间市场及固定收益证券交易平台的表现进行了分析。并根据流动性指标进行了实证分析,结果表明,固定收益证券交易平台使市场在深度及宽度等方面均得到了改善;通过横截面数据分析,可知银行间市场与交易所市场及固定收益证券交易平台比较,在市场深度方面表现出较大优势。因此,固定收益证券交易平台的引进,使债券流动性得到较大提高,对促进市场流动性有明显的作用。虽然固定收益证券交易平台的债券品种较少,但是当债券品种不断增多后,债券流动性将会得到改善。     

Developing recommender systems with the consideration of product profitability for sellers

In electronic commerce web sites, recommender systems are popularly being employed to help customers in selecting suitable products to meet their personal needs. These systems learn about user preferences over time and automatically suggest products that fit the learned model of user preferences. Traditionally, recommendations are provided to customers depending on purchase probability and customers’ preferences, without considering the profitability factor for sellers. This study attempts to integrate the profitability factor into the traditional recommender systems. Based on this consideration, we propose two profitability-based recommender systems called CPPRS (Convenience plus Profitability Perspective Recommender System) and HPRS (Hybrid Perspective Recommender System). Moreover, comparisons between our proposed systems (considering both purchase probability and profitability) and traditional systems (emphasizing an individual’s preference) are made to clarify the advantages and disadvantages of these systems in terms of recommendation accuracy and/or profit from cross-selling. The experimental results show that the proposed HPRS can increase profit from cross-selling without losing recommendation accuracy.     

影响太阳能光伏发电项目开发建设的有关问题分析

通过分析国内光伏发电项目的发展现状,并在分析光伏发电项目投资成本、风险和盈利模式的基础上,提出了企业投资光伏发电项目可采取的相应措施。     

Changing fertilizer practices

Traditional fertilizer practices using mostly single (ordinary) superphosphate applied to pastures on sandy-surfaced soils in the coastal areas of south-western Australia has contributed greatly to the eutrophication of waterbodies of the region. To reduce eutrophication, it is necessary to modify traditional fertilizer practices, involving the accurate definition of nutrient requirements for specific situations, and the evaluation of fertilizer strategy options to achieve optimal levels of yield. A model was developed to integrate available information on phosphorus, sulphur and potassium responses in pastures, and to estimate optimum fertilizer application requirements. The model uses a Mitscherlich function to describe pasture responses to applied fertilizer. Use of the model to estimate optimum fertilizer application rates also allows evaluation of the cost to agricultural production of reducing fertilizer application rates based on environmental rather than on agricultural productivity objectives.     

中国石化与四大国际石油公司的十年发展对比分析及启示

对比了中国石化与埃克森美孚、BP、壳牌和雪佛龙四大国际石油公司十年来的发展,重点从经营规模和生产规模两方面对五家公司进行了深入分析,寻找问题与差距,为以中国石化为代表的国内石化企业进一步提升竞争力提供参考。     

杜邦财务分析体系在建筑企业中的应用

杜邦分析法是一种财务比率分解的方法，能有效反映影响企业获利能力的各指标间的相互关系，对企业的财务状况和经营成果做出合理的分析，文章选取3家施工企业的进行说明。     

Innovative Output,Productivity and Profitability. A Test Comparing USPTO and EPO Data

The aim of this paper is to test whether patent‐based indicators are still reliable measures of innovativeness in light of organizational changes in the field of Intellectual Property Rights (IPR) protection and the regulatory reforms already occurred and under way, respectively, at the US Patent and Trademark Office (USPTO) and the European Patent Office (EPO). For most high‐tech industries, patents represent an outcome of the production process and their number can be taken as a proxy for a firm's ability to improve its productivity growth and profitability. The case study reported here concerns the biotechnology industry in Italy, whose firms, by definition, have Intellectual Property (IP) activities in their portfolios. For this purpose, we use a unique dataset which collects balance sheet items and patent information from EPO and USPTO. After linking firms' financial and production data with the patent information, we estimate a modified knowledge production function in which the dependent variable is alternatively (labor) productivity growth and profitability. Although based on a quite small sample, our findings provide some indication of a statistically significant relationship between patents with the EPO and both productivity growth and, in particular, profitability. This suggests that firms might pursue different strategies when patenting with the USPTO and the EPO.     

Extended lactations in a seasonal-calving pastoral system of production to modulate the effects of reproductive failure

This study was conducted to determine whether extending the calving interval (CI) to 24 mo would be an alternative to culling and replacing cows that had failed to become pregnant. Forty-six nonpregnant lactating cows were assembled in November 2004 and assigned to receive either 3 kg (low) or 6 kg (high) of concentrate supplement and a basal diet of grass silage and maize silage over the winter period (13 wk). Cows returned to pasture in late March and received 1 kg of concentrate/d until dry-off (milk yield <5 kg/d). Cumulative milk production was calculated from calving to the end of November 2004 (12-mo CI) and from the start of December 2004 until dry off in 2005 (extended lactation part of 24-mo CI). High winter feeding resulted in greater milk production over the winter confinement (20.0 ± 0.3 vs. 17.8 ± 0.3 kg/d for high and low winter feeding, respectively) and had a carryover effect during the remainder of the 24-mo CI period (5,177 vs. 4,686 kg; SEM = 173 kg). At the end of the study, cows were ranked on cumulative milk solids and separated into 3 groups (R1, R2, and R3). During the 24-mo CI, milk yields were 7,287, 6,267, and 5,273 kg (SEM = 308 kg) in yr 1, and 5,738, 4,836, and 4,266 (SEM = 241 kg) in yr 2 for R1, R2, and R3, respectively. Eighty-five percent of the cows became pregnant during the breeding season of yr 2, with a conception rate to first service of 52%. An economic analysis of different ranks with a 12-mo CI, a 24-mo CI, and an annualized herd effect, which compared an efficient spring calving system with 30% recycled cows in R1 and 10% recycled cows in R3, was carried out. Farm profit was reduced by 60% and 65% at a milk price of 22.3 euro-cents (c)/L with the corresponding values of 17% and 30% for a milk price of 30 c/L, respectively, when R1 and R3 systems were compared with an efficient spring milk (12-mo CI) production system. Within a spring system where 30% and 10% of R1 and R3 animals were subjected to extended lactations, the profit difference was reduced compared with an efficient spring system, The results indicated that lactations with a 24-mo CI may be a viable alternative to culling nonpregnant cows and be economically more suited to higher producing cows.