基于模糊关键链的施工企业进度管理研究

在项目实施中,不确定性因素的存在造成项目的完工与进度计划有偏差。本文采用三角模糊数描述工序持续时间的不确定性,并计算工序的期望工期。在此基础上进行缓冲区的计算,通过设置缓冲区制定的关键链有效的缩短了计划工期,保证项目的顺利完工。     

基于关键链的矿井建设计划的编制与研究

关键链技术不仅考虑了任务间的紧前、紧后关系约束,还考虑了任务间的资源冲突,并将组织行为中的一些结论应用到了项目进度管理之中,通过设置时间缓冲区,降低因资源而引起的进度风险,从而弥补了传统项目管理方法的不足,为项目进度制定和管理提供了一种全新的方法。针对矿山建设工程的特点,在对比分析了传统项目进度计划编制方法的基础上,引入关键链项目管理(CCPM)方法,设计了基于关键链技术的编制矿井建设计划的流程。同时,依托MineSched软件和MS Project为软件平台,将该方法运用于某矿的矿井建设计划编制中。采用此方法能快速根据优化的目标及资源约束条件生成相应方案,实现设计、计划、优化和管理的一体化,使整个计划模型与工程系统模型一致,便于调整和管理,人工或计算机处理效率高。     

基于CCPM的矿井建设计划的制定

目前,矿井建设多采用网络计划技术制定,但该传统技术存在估算工期过长、计划缺乏柔性等缺陷,本文引入关键链项目管理（CCPM）方法,通过设置项目缓冲区和输送缓冲区控制建设进度,有效降低了不确定因素对计划的影响,增强了计划的柔性,且保证了确定环境下编制的矿井建设计划,在不确定环境下的顺利执行。     

露天矿中长期生产计划三维可视化编制

露天矿中长期生产计划的编制是露天矿生产经营管理过程中重要的基础性工作,传统的长期生产计划编制工作量大、编制过程复杂,同时不便于后期中长期生产计划的修改和完善。借助Dimine数字矿山软件平台,结合矿山资源状况、矿产品销售价格、矿石开采与处理成本、作业技术条件等多种因素,在确定露天矿最终境界的基础上,实现露天矿中长期生产计划的三维可视化编制。以襄阳石灰石矿为研究对象,构建矿山钻孔数据库、矿体模型、数字地表模型、块段模型等,通过人工交互的方式编制适用于矿山开采的最佳露天矿中长期生产计划,极大提高了中长期生产计划的编制效率,研究结果为襄阳石灰石矿的正常生产提供了可靠的依据。     

基于DIMINE软件系统的露天矿境界优化研究

露天境界优化是露天矿设计和生产经营管理的重要环节,而最终境界优化是一项需要综合考虑矿山资源状况、开采技术条件、矿产品销售价格、矿石开采及处理成本等多种因素,实现经济效益最大化的复杂工作。目前,三维可视化矿床模拟技术和露天境界优化方法的完美结合使其工序更为简化,并可获得良好的动态效果。以广西平果铝土矿为研究对象,借助DIMINE软件系统建立了该露天矿山的三维实体模型,更加准确、直观地反映了矿床与工程实体的形态及其空间分布关系。针对所建的矿体模型进行了品位估值、储量计算等工作,并基于Le-rchs-Grossmann优化方法(L-G法)对该铝土矿进行露天境界优化研究,参照采矿手册及工程经验,确定合理的露天境界优化参数,得出了该矿山露天开采的最优经济境界。结果可用来指导该矿山前期的资源开发和投资决策,并为后期安排生产计划和实时调度控制提供可靠的依据。     

程潮铁矿合理三级矿量的研究

针对程潮铁矿采场结构参数调整和采矿设备更新的实际情况,采用开采工序按超前要求确定时空关系的方法,计算合理的回采、采准和开拓三级矿量,为矿山编制采掘进度计划提供理论依据.     

基于关键链的工程进度管理研究

关键链技术是工程进度管理的一大理论创新。文章讨论了项目进度延迟的机理,提出了关键链实施的步骤,进而分析了关键链中缓冲区的设置规则。关键链技术对项目成员的学生综合症和完工延报假定有很大改善,并在动态缓冲管理的监控下,当工程进度出现一定程度的延误时,缓冲管理会启动预警系统,促使项目管理人员及时采取补救措施,解决资源冲突,确保项目如期完工,对改善项目执行环境有很好的作用。     

露天矿生产进度计划的优化(一)

本文讨论了在露天采场最终境界一旦确定之后，与露天矿生产进度计划编制有关的多种问题。文中介绍了一个计算机软件包，可以用来评估多个长、短期生产进度计划方案。编制长期生产进度计划时应用模拟法，编制短期生产进度计划时则应用线性规划法，目标是使矿山全寿命期间的现金流最大。该模型曾用于一项案例研究。     

露天矿生产进度计划的优化（一）

本文讨论了在露天采场最终境界一旦确定之后，与露天矿生产进度计划编制有关的多种问题，文中介绍了一个计算机软件包，可用来评估多个长、短期生产进度计划方案，编制长期生产进度计划时应用模拟法，编制短期生产进度计划时则应用线性规划法，目标是使矿山全寿命期间的现金流量大，该模型曾用于一项案例研究。     

露天矿山单台设备的更新计划优化

目前国内矿山对于设备的使用仍然是本着技术寿命原则,忽略了设备的工作效率和运营成本与使用寿命之间的关系。为了尽可能降低矿山的运营成本,提高矿山的经济效益,基于动态规划的原理,建立给定矿山生产计划的单台设备的更新策略优化模型与算法,得出单台设备的最优更新策略。并以南芬露天矿电铲设备为例,运用已建立的模型算法,得出该矿山在具体的生产计划下单台设备的最优更新策略,为矿山运营过程中设备的更新提供借鉴。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered