Reserve estimation of an open pit mine under price uncertainty by real option approach

Reserve estimation is a key to find the correct NPV in a mining project. The most important factor in reserve estimation is the metal price. Metal price fluctuations in recent years were exaggerated, and imposed a high degree of uncertainty to the re-serve estimation, and in consequence to the whole mine planning procedure. Real option approach is an efficient method of deci-sion making in the uncertain conditions. This approach has been used for evaluation of defined natural resources projects until now. This study considering the metal price uncertainty used real option approach to prepare a methodology for reserve estimation in open pit mines. This study was done on a copper cylindrical deposit, but the achieved methodology can be adjusted for all kinds of deposits. This methodology was comprehensively described through the examples in such a manner that can be used by the mine planners.     

Relationship Among Reserve Ratio, Government Spending and Economic Growth

The relationship among reserve ration, government spending and economic growth was analyzed. A monetary endogenous growth model is well developed by taking into account the growth-enhancing effects of reserve-augmenting seigniorage. If the government spends all the seigniorage revenue on the provision of a public input which has positive externality on the private sector‘s production, some results to be utterly different from Bronx‘s have been obtained: the economy has a unique saddle-balanced growth path, but it has nothing to do with reserve ratio. However, the higher reserve ratio, the faster speed of economic convergence.     

Application of material strength reserve method to the stability analysis of earth dam of feilaixia multipurpose project

The material strength reserve method is practical in the study of the stability and failure mechanism of earth dam by analysing the development of failure zone of different shear strength parameters of the earth mass of the dam. The stability in the concrete dam and ensemble architecture has got general application while analysing. In combination with Feilaixia Multipurpose Project, application of this method to earth dam stability analysis was studied by plane Finite Element Method（FEM） for the first time. Through plane FEM, we can get the failure mechanism of earth dam and appraise to the security, for operating and managing put forward some reference suggestions.     

单一时段和多时段下区域旋转备用的获取

在满足区域购买备用成本最小的目标下,基于"协调运作"的备用交易模式提出了单一时段内获取区域旋转备用容量的两种方法:①报价排队法,按照区域统一边际备用价格结算.②非线性规划法,按照机组实际报价结算,然后扩展至多时段内区域备用获取的计算,通过全局优化得到了优化后的区域备用容量,体现了区域间的备用支持,降低了获取的备用容量,优化了各地的电力资源.仿真算例分别说明了单一时段和多时段下区域备用获取的方法和计算结果.     

双极性锌银贮备电池组电解液分配系统的研究

双极性锌银贮备电池组激活瞬间电解液分配的均一性,直接影响到电池组的电性能。与传统的单极性锌银贮备电池组相比,双极性锌银贮备电池具有许多优点。本文用优选进液垫片的方法改进双极性锌银贮备电池组电解液分配系统,确定合适的进液系统分配系数,组装实效电池组进行放电试验,改善了电池组的电性能。经实验与分析得出,用中心孔径为３．５ｍｍ的进液垫片粘在双极性片基上制成的电池组,放电性能最佳,它的分配系数λ值也正好接近经验数据１。     

超级蜡防印花工艺实践探讨

在分析欧洲超级蜡防印花技术的基础上,结合我国生产非洲蜡防印花布的生产实践,研发出了真泡泡蜡纹和仿泡泡蜡纹的两种工艺,其产品技术和风格接近欧洲超级蜡防印花技术工艺.     

利用测井资料计算煤层气单井控制地质储量

煤层气有两种贮存状态：吸附在煤颗粒表面的吸附气;悬浮在微孔隙中的游离气。根据吸附气和游离气的物理状态阐述煤层气地质储量的计算以及利用测井资料确定主要参数的方法。     

用串行E2PROM实现数据断电保护的方法

结合具体应用实例 ,介绍用串行E2 PROM实现数据断电保护的方法。对于少量数据的断电保护 ,完全可以用其替代用电池保护的方法 ,且具有可靠性高和成本低廉的特点。     

天生桥一级水电站厂区岩质高边坡稳定性三维弹塑性有限元数值分析

天生桥一级水电站厂区岩质高边坡中存在影响边坡稳定的断层、顺坡向裂隙及褶皱层面。基于三维弹塑性有限元分析,采用强度储备法研究了边坡在多种工况下的稳定性及失稳破坏机理,研究成果已供工程参考应用。该边坡已经历了施工及几年汛期暴雨的考险,边坡稳定。工程实践表明：研究成果可靠,强度储备法是岩质高边坡稳定性分析的有效方法。     

特殊原生成因煤的特性和分布研究

为实现特殊煤种的合理利用,选择树皮残植煤、角质残植煤、树脂残植煤、孢子残植煤和腐泥煤5种典型的特殊原生成因煤为研究对象,系统研究其性质特殊性,调查5种煤在我国的分布范围及资源量(储量),从能源和工艺2方面讨论了原生成因煤的开发利用价值,并从基础研究—勘查—综合利用等多途径,提出了特殊原生成因煤的合理利用建议。结果表明,特殊原生成因煤具有高挥发分、高氢含量和高H/C原子比等特点,且具有很好的生烃潜力。特殊原生成因煤分布在一定成煤期的部分煤层中。特殊原生成因煤的开发利用潜能很大。应加强基础研究,深入分析特殊原生成因煤的特殊性质,查清资源量,结合我国发展和需求,进行战略性的、持续性的综合利用研究。