俄罗斯小型地下资源开采企业发展问题

俄罗斯国家的矿产资源开采时间较长且开发程度较深,但目前俄大中型高品位矿区面积已十分有限,科学有效地利用小型较高品位地下矿产品资源成为俄罗斯亟待解决的问题。对俄罗斯小型地下资源开采企业发展现状进行分析,总结该国地下资源开发模式上的特点,进一步说明对地下资源的＂清理能力＂使得中小型地下资源开发企业的存在具有十分的必要性,也是其价值的体现,对我国矿产资源的合理利用和中小型矿山、石油企业的发展提供经验借鉴。     

钼精矿跌至历史低位 摆脱严冬仍待时日

近年,国内钼精矿价格有起有伏,但价格整体走势震荡走低。自2008年全球金融危机以来,钼精矿价格新低迭创。截止16日,国内含量为45%钼精矿的最新报价约为1400元/吨度,较年初时下跌了约10%,跌至2012年8月历史低价水平,较2005年高位缩水约80%。据上海有色网(SMM)调研了解,从2012年年中起,陕西、河南、辽宁等钼精矿主产区企业相继停产保价,但实际效果并十分不理想,仅在2012年12月至2013年2月,市场价     

IMPACTS OF ATOVS DATA ASSIMILATION ON PREDICTION OF A RAINSTORM OVER SOUTHEAST CHINA

Using the Advanced Research WRF (ARW WRF) model and the Gridpoint Statistical Interpolation (GSI) three-dimensional variational analysis (3DVAR) system, the impact of assimilating ATOVS (Advanced TIROS Operational Vertical Sounder) radiance through the prototype Community Radiative Transfer Model (pCRTM) is evaluated on the forecasting of a heavy rainstorm occurring over the central Guangdong province in the southeast of China on 20-21 June 2005. A pair of comparison experiments (NODA and DA) for this case is conducted with multiple configurations, including nesting domains with 4-km and 12-km grid distances. The results showed that by changing the initial condition through data assimilation, a modified divergence and moisture field with the structure of dipoles has been added to the axis of the rainband with a southwest-northeast orientation. When more moisture carried by a southwesterly low level jet (LLJ) was converged into the northeast portion of the rainband around the observatory station of Longmen, the amplitude of moisture static energy (MSE) increased substantially at low levels much more than at middle levels, resulting in the enlarging of differences in MSE between 500 hPa and 850 hPa; the atmosphere became more unstable. Consequently, the convective rainfall increased in the northeast part of the province around the Longmen station, which was consistent with the observed distribution of rainfall.