Crude oil price forecasting: a biogeography-based optimization approach

The importance of crude oil in the world economy has made it imperative for efficient models to be designed for predicting future prices. This paper proposes an alternative approach based on a time series and biogeography-based optimization (BMMR–BBO) for the estimation of the West Texas Intermediate (WTI) crude oil price. To evaluate the forecasting ability of the presented model, we compared its performance with those of time series functions. The results of the experiment showed that BMMR-BBO performed better than the other methods and is a fairly good option for crude oil price prediction. The proposed model can be useful in the formulation of policies related to international crude oil price estimations, development plans, and industrial production.     

Mixed coordination mechanisms for scheduling games on hierarchical machines

In this paper, we study scheduling games under mixed coordination mechanisms on hierarchical machines. The two scheduling policies involved are ‐ and ‐, where ‐ (resp., ‐) policy sequences jobs in nondecreasing order of their hierarchies, and jobs of the same hierarchy in nonincreasing (resp., nondecreasing) order of their processing times. We first show the existence of a Nash equilibrium. Then we present the price of anarchy and the price of stability for the games with social costs of minimizing the makespan and maximizing the minimum machine load. All the bounds given in this paper are tight.     

Interactions between hybrid nanosized particles and convection melting inside an enclosure with partially active walls: 2D lattice Boltzmann-based numerical investigation

The ice melting is investigated inside a square cavity with two isothermally partially active walls. The concept of dispersing hybrid alumina–Cu nanoparticles and hybrid silica–multiwalled carbon nanotubes (MWCNTs) nanoparticles is recommended for thermal performance enhancement in this thermal energy storage (TES) system. The two-dimensional explicit lattice Boltzmann convection melting scheme in the single-phase model is applied to account for the natural convection flow induced in the melt region and evolution of the solid–liquid interface. The complete melting time for the pure phase change material (PCM) using case (II) is 33.3% lower compared with other cases. If the price of hybrid Al₂O₃–Cu nanoparticles and heat storage capacity is important, the full melt time diminishes by 16.6% with a volume fraction of 0.01 in case (II). Once hybrid silica–MWCNT nanoparticles with a volume fraction of 0.01 are utilized inside case (II), the lowest charging time is achieved. The complete melting time abates by 23.66% in contrast to the pure PCM melting. The use of single/hybrid nanoparticles to enhance the PCM melting is not necessarily economical as efficient positions of active parts could further lessen the charging time. The efficiency of hybrid nanoparticles is linked to the type and weight proportions of nanoparticles, and positions of thermally active parts.     

如何在工程量清单招标模式下提高中标率

介绍了在工程量清单招标模式下,为提高中标率应重视的关键过程,报价策略和方法,并对该招标模式下尚存在的与市场竞争机制不相一致的若干问题进行了探讨。     

城市土地价格的动态增长研究

由于土地是不可再生的准公共品，市场土地供应总是小于土地需求。一个城市的土地总体价格水平将会因为资本追加、土地的集约利用以及城市基础设施、公共服务的改善而得到提高，地价总是趋于动态增长的。本文就是试图对这一现象进行研究。     

矿山基建合理确定建筑工程造价初探

结合北Min河铁矿基建过程中的工程实例，分析了建筑工程造价的确定步骤、影响因素，并对如何合理确定建筑工程造价等问题进行了初探。     

中国钢材市场发展趋势及对铁矿石市场的影响

依据我国国内钢铁生产和消费、钢材外贸、GDP的增长和固定资产投资等方面的数据，分析了钢铁工业产能过剩的现实和趋势。考虑到科技进步，并列举了工业、农业和交通运输业等国民经济发展的有关数据，说明“十一五”期间国内钢铁市场需求还将增长，但增幅将逐年回落。预计2010年需要生产钢5亿t。用全球经济、全球钢铁产量变化和国内钢材进出口结构等有关数据，分析了“十一五”期间中国钢铁市场的不稳定因素，并预计钢材价格必将不稳定。同时根据钢铁市场状况、铁矿采选建设和生产状况以及进口矿石量等，说明铁矿石将较长时期保持较高价位，不可能大幅回落。     

城市基准地价及其地价动态监测分析

城市基准地价是我国地价体系中的重要组成部分，但它是以城市定级为基础而确定的区域土地使用权的平均价格，带有抽象性和局限性，需要从动态的观点来监测分析。     

城市道路两厢商住地规划开发问题的探讨──论道路两厢地价的调整方法

以益阳市大桃南路、秀峰中路两厢商住用地地价调整为例，探讨了城市道路两厢地价随开发进度进行合理调整的基本思路及调整修正方法。试用结果表明，该办法效果良好。     

企业集团税收筹划策略分析

随着原大型国有企业的改组改制,我国组建了大量的企业集团,在集团内部组建、转移定价存货计价和固定资产折旧等方面客观上存在着税收筹划的空间.本文对此税收筹划策略进行分析,以达到最好的节税效果.