Establishment and adjustment of monsoon-driven circulation in the South China Sea

The South China Sea (SCS) is one of the large marginal seas of the western Pacific Ocean. In comparison with open oceans, the SCS circulation has obviously transient characteristics due to its small basin-scale and semi-annually reversed monsoon forcing. …     

鄂西和滇西孕震深部构造变异的对比研究

根据最新精细重力异常场及其三维反演结果，用类比法研究了鄂西与滇西两区域各波长重力场变异特征和地壳层间结构差异，并对重点监测区危险地段划分所需的深部构造信息和动力学特征进行了探讨。     

A STATISTICAL STUDY OF THE RESONANCE LINE OF Ca XIX OBSERVED WITH it YOHKOH BRAGG CRYSTAL SPECTROMETER

Using the observational data of a Bragg crystal spectrometer on Yohkoh for the period from October 1991 to the end of 1995, we have made a statistical study of flares which consist of a single loop or are dominated by a single loop in SXT images. A total of 158 flares are sampled. With a temporal resolution of three seconds, we conclude that although the blue asymmetry is very common during the impulsive phase, the number of events with total blue shift is rather small, and only a very small number have a large total blue shift, contrasting with the predictions of some hydrodynamic models. It is also found that the blue shift for most flares appears at the early impulsive phase and is temporally correlated with the broadening of the line. These results demonstrate the necessity for checking whether chromospheric evaporation always occurs in solar flares.     

清江隔河岩水库诱发地震的条件与地震活动特征

分析了清江隔河岩水库区诱发地震的形成条件、地震时空分布特征以及库水位与地震活动的相关性 ,结果表明 :该水库的地震活动类型属典型的震群型水库地震 ,其成因主要为岩溶陷落。     

考洲洋化学耗氧量(COD)的含量特征

1999年2月和8月对考洲洋海水、表层沉积物COD含量进行了调查研究.结果表明考洲洋海水COD含量为0.82～2.71 mg·L-1,表层沉积物COD含量为0.44～10.45 mg·L-1,其水质质量达到我国国家二类海水水质标准(COD＜3 mg·L-1).海水与表层沉积物COD含量平面分布总的呈西北部水域和湾中部水域向湾口降低的趋势.表层沉积物COD含量与有机质、硫化物含量呈显著的正相关(P＜0.05).与粤东邻近的网箱养殖水域比较,海水COD含量居中,表层沉积物COD含量较低.     

东天山红石金矿原生晕轴向分带研究

分带性是热液矿床重要特征,也是勘查与评价热液矿床的重要方法。为建立矿床完整轴向分带模式,需有矿体不同中段的化探样品分析数据。但对于产状较陡、深部工程少的矿体,要建立较准确的原生晕分带难度较大。以新疆红石金矿L1矿体1137 m、1080 m、1000 m和900 m的样品分析数据,分别采用“格氏”、“克氏”和“重心”法计算矿床轴向分带,再利用计算结果综合确定该矿床的原生晕分带模式。勘探验证表明,确定的分带模式与实际吻合性较好,是一种有效确定分带的方法。     

广东紫金风门坳锡多金属矿成矿元素分带规律

广东紫金风门坳矿区富集Sn、W、Pb、Zn、Cu、Mo、Au、Ag、As等元素,但分布不均匀,具有叠加富集特征。通过在风门坳矿区开展1∶10 000土壤地球化学测量工作,圈定了2处矿致综合异常,结合各矿床（点）成矿特征,认为风门坳矿区成矿元素自北西向南东依次为Sn、W、Pb、Zn、Cu、Mo→Sn、Cu、Au→Pb、Ag、Zn,呈规律性水平分带。结合矿区3号勘探线矿化（体）特征,认为矿床成矿元素在垂直方向自上而下分带为Sn、W、Pb、Zn→Cu、Zn、Ag→Sn、Zn。上述规律可为今后在该区继续开展扩大扩深找矿工作提供有利线索。     

Vertical dynamic response of a pile embedded in a poroelastic soil layer overlying rigid base

Acta Geotechnica - This paper presents an analytical solution to investigate the vertical dynamic response of an elastic pile embedded in poroelastic soil overlying a rigid base. The pile top is...     

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