矿物磁性特征在金矿床形成及成矿预测中的作用

金矿床形成和成矿预测一直为国内外学者所关注。随绿岩带金矿、暗色岩易富金及赤铁矿总含有大粒金等不断地被发现,指示矿物磁性对金矿床形成有一定的控制作用。1)金粒级的大小与磁体间作用力的强弱呈正比,磁力的大小与两磁体间距离的平方呈反比,这正、反比规律进一步解析绿岩带富金机理和强、弱磁性岩石富金条件的差别。2)电流在金、黄铁矿和磁黄铁矿等附近每一点都能产生磁化场(H场)和磁通密度(B场),H场和B场的大小与不同成矿介质具有一定的正比例关系,按此比例可追踪含矿流体形成过程和富金条件。3)根据矿物磁性特征,建立了矿物磁力晕、矿物磁性矢量等找矿标志。4)除温度和压力等因素外,矿物磁性特征应视为金矿床形成和预测主要条件之一。     

Spatiotemporal distributions and influences on snow density in China from 1999 to 2008

Ground snow observation data from 1999 to 2008 were used to analyze the temporal and spatial distribution of snow density in China. The monthly maximum density shifted from north to south during the period from October to the following January, and then moved back from south to north during the period from January to April. The maximum snow density occurred at the border between Hunan and Jiangxi provinces in January, where snow cover duration was short and varied remarkably. Snow density in Northeast China and the Xinjiang Uygur Autonomous Region were also high and showed less variation when the snow cover duration was long. Ground observation data from nine weather stations were selected to study changes of snow density in Northeast and Northwest China. A phase of stable snow density occurred from the middle ten days of November to the following February; non-stationary density phases were observed from October to the first ten days of November and from March to April. To further investigate the effects of climatic factors on snow density, correlations between snow density and precipitation, air temperature, snow depth and wind velocity for Northeast and Northwest China were analyzed. Correlation analysis showed that snow depth was the primary influence on snow density.     

判别地下水异常的干扰性与前兆性的原则及其应用实例

提出了地下水干扰异常识别与排除的4个“相关性”原则,即成因上的相关性、空间上的相关性、时间上的相关性与强度上的相关性;提出了地下水前兆异常确认的4个判据,即首先是非干扰性异常,其次是有震例与理论模式的支持,再次是已有前兆映震理论或模式的支持,最后是有其它测项与学科异常的配套.还介绍了利用上述原则与判据排除江苏省宿迁市大...     

Opportunities and challenges in rebuilding tornado-impacted Greensburg,Kansas as “stronger,better, and greener”

A May 2007 tornado destroyed 95% of aging, declining Greensburg, Kansas. The city took the opportunity to build back “stronger, better, and greener,” enforcing upgraded codes, requiring city-owned buildings to meet LEED Platinum level standards, and recommending energy-efficiency housing in a new Sustainable Comprehensive Plan. Using information collected from surveys of Greensburg tornado survivors, interviews, and publications, we examined the housing-related recovery, including the emergency provision of temporary shelter and rebuilding permanently. Although temporary shelter kept residents nearby for rebuilding, given the gap between insurance policy limits on the aging housing stock and rebuilding costs, housing affordability is a critical issue in Greensburg’s recovery. Local, state, and federal support have made construction of municipal buildings at LEED Platinum level and some affordable and green housing projects possible. However, far greater public and private sector funding for affordable workforce housing, in conjunction with broader economic and job development, is needed.     

大同－阳高地震前静乐井水位记震能力的异常及其意义

本文系统分析了大同６．１级地震前静乐井水位记震能力增强的异常现象，并依此为基础结合国内有关资料，初步提出了利用井水位记震能力的异常变化进行中期强震危险性判断的方法，讨论了建立这种方法的科学依据。     

分县逐日滚动MOS预报模式研制及其应用

本文介绍了江苏分县逐日滚动1－5天时效的MOS预报的研制，包括降水的概率MOS法和量级MOS法，预报量设置、季节分型和样本选择，因子的构造及其加工，概率统计模型的选择及其因子预选、筛选。最后介绍了MOS工具在省台MICAPS平台上的业务应用及其效果。     

地下水动态映震机制的试验与观测研究

本文根据一系列室内外试验与观测研究结果,论述了震前地下水位动态异常信息形成的四个基本环节:①地壳应力活动与含水层应力状态的变化,②含水层变形破坏与孔隙压力的变化;③孔压变化信息在井—含水层系统中的传递;④孔压变化信息在井孔地下水动态中的表现。在此基础上,提出了地下水动态映震特性的若干观点。     

福建汤坑群井的水位固体潮与水震波特征

汤坑群井由7口地震地下水动态观测井组成,彼此相距不过几百米。近两年的观测结果表明,这些井都能记录地球固体潮,大部分能记录地震波,但各自的显示特征不同。本文以各井孔的地质-水文地质背景条件与井孔结构特征为基础,对比分析了群井的水位固体潮与水震波特征