Study on numerical simulation to water lowering in an open coal mine digging

In view of the situation of excavation of open coal mine for the underground water disaster,we should carry out simulation studies for the numerical value of the water lowering project and improve the accuracy and the level of the water lowering project.On the basis of the hydrological geological conditions of certain open mine digging,a more reasonable seepage numerical model was built according to MODFLOW.It was simulated in advance that the process of the confined water level descending with the time,and combining with the actual observations to test the correctness of the model.The calculation showed that the results coincided well with the results of actual measurement.Based on this,different water lowering numerical simulations were built for the open coal mine digging.It could be simulated and forecast that the changes of the groundwater level in drainage process within and outside the mine pit,and it was quantitatively assessed that the possible water lowering result of the opencast water drainage process,which provide an important basis for the actual water lowering project and the possible project disposal.     

RESOLUTION OF MULTICOMPONENT FLUORESCENT MIXTURES BY ANALYSIS OF THE EXCITATION-EMISSION-FREQUENCY ARRAY

Fluorescence lifetime provides a third independent dimension of information for the resolution of totalluminescence spectra of multicomponent mixtures.The incorporation of this parameter into theexcitation-emission matrix(EEM)by the phase modulation technique results in a three-dimensionalexcitation-emission-frequency array (EEFA).Multicomponent analysis based on the three-dimensionalEEFA brings a qualitative change for the resolved spectra,i.e.individual spectra can be uniquely resolved,which is impossible with any two-dimensional analysis.In this paper we present a method for analyzingthe EEFA.We show mathematically that with the three-dimensional analysis of the EEFA individualspectra and lifetimes can be obtained.Our algorithm is developed in mathematical detail and isdemonstrated by its application to a two-component mixture.     

Controlling mechanisms for the trace metals, (Cu,Zn, Cd,Fe, Co and Ni) in anoxic sea water in Saanich Inlet,British Columbia,Canada

A study was conducted on Cu, Zn, Cd, Fe, Co and Ni levels in Saanich Inlet anoxic seawater. Data on the concentration of these trace metals and H₂S, and other oceanographic parameters were obtained in four cruises. Equilibrium models are presented together with in situ data. The results strongly support the assumption that the solubilities of Cu, Zn, Cd, Fe, Co and Ni are controlled by bisulfide and/or polysulfide complexes. The species of Cu, Zn, Cd and Ni are shown to be Cu(S₄) ₂ ³⁻ and Cu(Sn₄S₅)³⁻, Zn(HS) ₂ ⁰ and ZnHS ₂ ⁻ , Cd(HS) ₂ ⁰ and Ni(HS) ₂ ⁰ , respectively. The solid species controlling Fe²⁺ and Co²⁺ are respectively the pyrohotites FeS and CoS. The data illustrates that thermodynamic equilibrium has been established in the H₂S-controlled seawater of Saanich Inlet, and that equilibrium has not been established in the H₂S−O₂-coexisted seawater of Saanich Inlet. The lack of equilibrium in the H₂S−O₂-coexisted seawater is a result of the flushing or mixing of oxygenated seawater with anoxic water. The new species of trace metals are still in the processes of reduction and precipitation. Contribution No. 1428 from Institute of Oceanology, Academia Sinica     

Magnetic susceptibility variations of the Edicaran cap carbonates in the Yangtze platform and their implications for paleoclimate

1 INTRODUCTION One of the most intriguing phenomena in the late Neoproterozoic (~750 to 543 Ma) is the globa occurrence of thin carbonates that directly overlie glacial deposits in almost every continent (Kennedy 1996; Hoffman et al., 1998; Hoffman and Schrag 2002; Brasier and Shields, 2000; James et al., 2001 Jiang et al., 2003; Nogueira et al., 2003). These “cap carbonates”, commonly several to tens of meters thick, have attracted enormous interests because o their unusually negati…     

宝顶石刻区污染地下水对造像岩体的破坏作用

污染地下水渗入大佛湾摩岩造像群，在石刻表面积聚可溶盐，加剧了石刻的侵蚀破坏，其中尤以泥质细粒长石砂岩风化剥落最为严重。研究渗水病害对石刻保护有重要意义。     

Discovery of A-type Granite Zone and Its Geodynamic Significance in the Western Kunlun Mts., China

l. IntroductionGranite distributes widely in western KunlunMts. Many researches have been conducted byscientists (Wang Yuzhen et.al., l987; Zhang Yuquanet.al., l989, Fang Xilian et.al., I990, Jiang Chunfaet.al., 1992; Pan Yusheng, l992, Xu Ronghua et.al.,l 994; Jing Daogui et.al., l996, Zhang Yuquan et.al.,l998). But all of the researches have been donealong Sino-Pakistan road and Xinjiang-Tibet roadt"ith fOcus on isotopic dating of the intrusion andconducted a few on origin and tect…     

应用氢氧同位素方法研究兰州市傍河水源地地下水水体的形成和循环机理

本文通过测定水中氢氧同位素的变化来对兰州市傍河水源地地下水体的形成和循环机理进行分析探讨。分析了兰州市马滩水源地水质恶化的程度,探讨了恶化的原因。对其工作原理及方法作了较详尽的论述。     

Fluid venting from a mud volcano in the Mediterranean Ridge Diapiric Belt

Direct observation of active emission of fluids and mud from a submarine mud volcano were made for the first time in an extensive field of mud diapirs and mud volcanoes on the Mediterranean Ridge using a video camera towed 2 m above the seafloor in 1800 m of water. This recent research using both long range and deep-towed sidescan sonar systems indicates also that diapirism and eruption of mud along the crest of the ridge is more common than previously thought. The southwards increase in age of rock fragments carried within the erupted mud supports the hypothesis that the fluid mud becomes overpressured within a southward-dipping backthrust from the Inner Deformation Front of this accretionary prism.     

辽东半岛南部早古生代馒头组—冶里组沉积盆地演化

辽东半岛南部早古生代地层发育,其中馒头组—冶里组的沉积过程,具有完整的陆源碎屑岩—碳酸盐岩堆积特点。从层序划分、沉积环境演化、古气候变迁等方面分析,馒头组—冶里组反映了一个完整的碳酸盐岩台地的发展过程,可划分出准备阶段（形成碎屑岩垫板）、生长—发育阶段（形成碳酸盐岩缓坡）及衰亡阶段（发育白云岩盖层）。