基于RBF神经网络的中国黄金市场价格预测

本文以上海黄金市场的现货交易为研究对象,鉴于传统的线性分析方法的局限性,构建了RBF神经网络非线性模型,对上海黄金市场的Au99.99开盘价进行了预测。结果证明,RBF神经网络模型为黄金价格预测提供了一种有效的高精度的预测工具。     

矿井绝对瓦斯涌出量的新陈代谢GM(1,1)预测

简要论述了瓦斯涌出量预测方法,结合国内实际,提出灰色模型预测方法,并根据该矿过去十年的瓦斯绝对涌出量资料建立了新陈代谢GM(1,1)模型。通过模型的求解,给出预测结果,并对结果进行检验。而且将未来5年的瓦斯绝对涌出量预测值用折线图画出,分析了其总体趋势并给出大体的建议。     

信息偏离度、投资者情绪与内在价值——基于上证指数2005-2014年的实证分析北大核心CSSCI

文章在投资者情绪、信息偏离度和内在价值的统一框架下讨论价格变动的深层影响机理。实证结果表明:投资者情绪是造成中国证券价格异常波动的主要原因;市场情绪是导致中国股市非理性大起大落的重要因素;信息偏离度的存在进一步加剧了证券价格的异常波动,推动了价格上涨或下跌,具有正效应;内在价值对证券价格的影响具有长期确定性的特点。     

隐秘的财富

提到瑞士,人们总是想到发达的银行业和钟表制造业,殊不知,这个国家还有一项令人自豪的产业--炼金业. 数据显示,尽管瑞士并没有金矿,但全球2/3的黄金都是在瑞士提炼的.世界上最大的四个炼金厂均位于瑞士,其中三个坐落在瑞士南部的提契诺州.瑞士每年进口超过2600吨的生金,总价值1030亿美元.金业和金条制造业在这个国家,早已发展得十分成熟. 在外面看来,Pamp炼金厂跟其他现代化的工厂没什么两样,但一旦进入内部,一切就变了样.在一个房间里,熔化了的矿石被倒入模具,用以制成重达12.5千克的金条.每盎司黄金的价格目前大概是1700美元,每条12.5千克的金条价值约为68万美元.     

中国减速?

2012年第一季度中国经济增长率从2011年年底的9.2%降低至将近7%,中国经济在之后能否重新振作取决于外需对中国出口的拉动以及中国的政策,特别是信贷政策和财政政策。中国减速有一些实实在在的标志,包括3月份制造业指数的下降。汇丰银行公布的3月份PMI指数为48.3,是四个月以来的最低;有趣的     

Trauma epidemiology and outcome in a developing country: perspectives from a university teaching hospital in Beirut

This study aims at evaluating trauma care at the American University of Beirut Medical Centre (AUB-MC) and comparing it to the norms established by the Major Trauma Outcome Study (MTOS). From January 2001 until January 2003, data necessary to calculate probability of survival using the Trauma Injury Severity Score methodology were collected. M, W, Z, Ws and Zs statistics were calculated to compare outcome at AUB-MC to the MTOS dataset. A total of 873 patients were included in the study. W statistics was calculated at 0.35 with Z score for the overall sample of 0.081 indicating that there was no statistically significant difference in survival between this group and the MTOS group. In a developing country a hospital achieves trauma outcomes similar to the MTOS dataset. Further studies looking at trauma care in Lebanon as a whole are needed.     

A review of violent and traumatic deaths in Kathmandu, Nepal

The objective was to study the external causes of death reported in the autopsy centre in Kathmandu, Nepal. A retrospective review of case report documentation of all violent and traumatic death autopsies was conducted in Kathmandu from mid-July 2000 to mid-July 2004. A total of 4383 autopsies were conducted by the Department of Forensic Medicine in Kathmandu. There were 1072 (25%) cases of suicide, 380 (9%) homicide, 1399 (32%) accidental, 598 (14%) deaths as a result of natural diseases and 923 (21%) undetermined causes of death. The number of males was almost twice that of females (sex ratio 2.2:1). Persons aged 15 to 44 years comprised about two-thirds of the total reported fatalities (65.4%). Suicides were mostly reported due to hanging, homicides mostly due to firearms and explosives, accidents mostly due to road traffic injuries. More than 60% of road traffic injuries resulted among pedestrians. Suicides, homicides and accidental deaths remain a poorly identified public health issue in Nepal. Medico-legal autopsy reports can serve as an important tool in understanding fatalities from violence and injuries for countries similar to Nepal. Strengthening a regular mechanism for compilation and utilization of the information, however, remains a major challenge.     

地质填图实习线上、线下混合式教学的探索

地质填图实习是高校地学专业的核心实践课程,为提高传统教学的质量及效率,我校在实习中引入了线上资源,通过几年的探索、建设与对比,总结出如下教学经验:(1)混合式教学在填图实习中可以有效提高教学效率,减轻教学负担;(2)线上教学资源的好坏决定着混合式教学的推进,提高学生的接受度是关键;(3)在地质填图各个阶段学生的实践训练是重点,也是进行专业研究的基础,工作教程和技能操作分解资源是线上的建设重点;(4)在线测试能够起到督促学生复习、检测学生真实学习效果、提高过程性考核和成绩公平的作用,可以进一步规范和推广;(5)线上资源是野外实习的有效补充,但不能代替野外实践。     

交互作用多目标规划技术的应用

一 绪 言 进行农业开发的目的是为了满足若干个社会经济目标。这些目标包括增加生产、增加就业和提高利润,以及其它诸如环境稳定、污染降低和政治补偿等。一般说来,区域性的农业开发取决于从其它地区和其它经济部门的投入以及对其它地区和经济部门的产品输出。