可用于地震早期预警的家用地震仪

日本气象厅(JMA)已开始推出一项地震早期预警(EEW)的实际服务,预计在不久的未来,将非常密集地布设安装信号接收装置。地震早期预警的接收/预警装置配有中央处理器和内存,并通过互联网进行连接。再加上一个便宜的地震仪和模数(A/D)转换器,该装置就变成了一个实时的地震观测系统,我们称之为家用地震仪(Home Seismometer)。如果这种家用地震仪与地震早期预警的标准接收装置相连接,那么地震观测系统的数量就会极大地增多。在房间里,由人的活动所引起的背景噪声可能非常大,为此我们专门编写了软件,从而能够使用该家用地震仪进行现场预警。我们对软件做了检验,发现该软件能够准确地将噪声和地震分辨开来,并适用于几乎所有的地震事件。     

CRETACEOUS AND TERTIARY BOUNDARY IN THE TINGRI REGION OF SOUTHERN TIBET

CRETACEOUS AND TERTIARY BOUNDARY IN THE TINGRI REGION OF SOUTHERN TIBETtheNNSFProject(49872 0 0 3)andtheNationalProject (G19980 40 80 0 )ofChina     

The Role of Organic Matter During Metal Enrichment in Permian Kupferschiefer of the Rudna Mine,Southwest Poland

The bulk composition of organic matter and saturated and aromatic hydrocarbons extracted from 16 samples collected from two Kuperschiefer profiles in the Rudna mine,Southwest Poland has been analyzed to study the role of organic matter during base metal enrichment in the Kupferschiefer shale.The results indicated that the extract yields and saturated hydrocarbon yields decreased with increasing base metal contents.GC and GC/MS analyses indicated that n -alkanes and alkylated aromatic compounds were depleted and may have served as hydrogen donators for thermochemical sulfate reduction.The enrichment of base metal is closely connected with the destruction of hydrocarbons.     

http://www.sciencedirect.com/science/article/pii/S1674987111000508

This paper presents the results of a set of numerical models focussing on structural controls on hydrothermal mineralization.We first give an overview of natural phenomena of structurally-controlled ore formation and the background theory and mechanisms for such controls. We then provide the results of a group of simple 2D numerical models validated through comparison with Cu-vein structure observed near the Shilu Copper deposit(Yangchun,Guangdong Province, China) and finally a case study of 3D numerical modelling applied to the Hodgkinson Province in North Queensland(Australia).Two modelling approaches,discrete deformation modelling and continuum coupled deformation and fluid flow modelling,are involved.The 2D model-derived patterns are remarkably consistent with the Cu-vein structure from the Shilu Copper deposit,and show that both modelling approaches can realistically simulate the mechanical behaviours of shear and dilatant fractures.The continuum coupled deformation and fluid flow model indicates that pattern of the Cuveins near the Shilu deposit is the result of shear strain localization,development of dilation and fluid focussing into the dilatant fracture segments.The 3D case-study models(with deformation and fluid flow coupling) on the Hodgkinson Province generated a number of potential gold mineralization targets.     

水文科学——社会的需要(节选)

水文科学家由于他们取得的成就满足了社会的需要而感到自豪。在二十世纪八十年代,由于资料收集的增加,电子计算机模拟法和分析技术的开发,提供了很多工具,足以解答很多实际问题。就是说: 1.频率分析技术取得良好的进展,可以应用于江河、湖泊、水利工程的规划设计作水文分析计算。虽然对于如何选择正确的分布函数以及如何去拟合的问