The Research on Acoustic Properties of Granite under Uni-axial Compression Condition

The paper deals with the ultrasonic wave-spectra parameters including velocities of compression and shear waves, dynamic young’s meduli and Poisson’s ratio, density function and average frequency ration of amplitude spectra, waveforms, etc.. And also, presented are the change law of these parameter of variously-weathered granite in the course of uniaxial compressive loading and its relationship with the mechanical characters.     

Relations between Sound Wave Velocities and Physical Properties of Quartz Sands

The correlations of sound wave velocities and physical properties of quartz sand with different grain size were investigated through laboratory tests. Emphases were put on studying the relationship between density, water content and longitudinal and shear wave velocities. The equations which show the correlation of density, void ratio and longitudinal and shear wave velocities, and with water content as a parameter are given in this paper. In addition, the monotonic relations of density, void ratio and sound wave velocities for sands with different water content are also presented.     

黄铁矿、菱铁矿、白云石在不同气氛下热行为的研究——QDTA/T/EGD/GC在线联用技术(Ⅶ)

应用差热分析(DTA)/逸气检测(EGD)/气相色谱(GC)在线联同技术及其装置,对黄铁矿、菱铁矿、白云石在N_2、Air、CO_2、Air/CO_2气氛下的热行为进行了研究。依据测得的DTA/EGD/DC曲线所提供的信息,探讨了黄铁矿热氧化分解反应历程;鉴定了菱铁矿中的含硫杂质;考察了白云石在N_2、Air、CO_2气氛下的热行为。实验结果表明,把热分析与高灵敏度的逸气检测/逸气分析的联用技术应用于矿物学研究领域中,将更发挥其潜在的优越性和独特的效用。     

圆锥状褶皱的几何分析

长期以来,地质学家习惯于把不同类型和不同成因的褶皱的基本形态当作圆柱状几何性状处理,建立了褶曲构造的基本几何要素,并且以此作为划分构造均匀区段的几何准则。从最近十余年来关于区域变质造山带的大量观测研究证明,还有另一种褶皱,即圆锥状褶皱,广泛发育于褶皱复杂的变质岩系之中,在不同尺度上显示其控制作用和对区域构造格架的影响。     

关于地震预报的综合概率模式

本文试图探索在现有各种预报手段的基础上逐渐形成一种比较客观、比较定量的综合预报技术的可能性,並提出一种地震预报的综合概率模式,供地震部门参考,並希望广大地震预报工作者能对这个问题展开讨论。     

Hydrothermal uranium deposits and sulfur isotopes

Research on sulfur isotopes in hydrothermal uranium deposits with acid alterations shed much light on the genetic aspects of hydrothermal uranium deposits. Based on the studies of uranium deposits of different genesis, it is concluded that σ³⁴S of Sulfides in hydrothermal uranium deposits derived from residual magma is within the range of +2‰ ?2.6‰, approximately the same as meteorite sulfur. δ³⁴S of Sulfides in polygenetic hydrothermal uranium deposits is slightly lighter than meteorite sulfur and varies over a restricted range (6.7‰), averaging ?10.15‰. Two intervals can be recognized with respect to sulfur isotopic compositions in palingenetic hydrothermal uranium deposits. δ³⁴S of sulfides formed in diagenesis, autometamorphism and hypothermal stages is similar to meteorite sulfur. On the other hand, at the stage starting from the alteration of uranium mineralization to the formation o uranium deposits and postmineralization the average δ³⁴S is -7.89‰, with a wider range of δ³⁴S variation (13.7‰), which can be attributed to the enrichment of δ³⁴S in palingenetic hydrothermal solutions.     

Minimization and estimation of geoid undulation errors

The objective of this paper is to minimize the geoid undulation errors by focusing on the contribution of the global geopotential model and regional gravity anomalies, and to estimate the accuracy of the predicted gravimetric geoid.The geopotential model's contribution is improved by (a) tailoring it using the regional gravity anomalies and (b) introducing a weighting function to the geopotential coefficients. The tailoring and the weighting function reduced the difference (1) between the geopotential model and the GPS/levelling-derived geoid undulations in British Columbia by about 55% and more than 10%, respectively.Geoid undulations computed in an area of 40° by 120° by Stokes' integral with different kernel functions are analyzed. The use of the approximated kernels results in about 25 cm () and 190 cm (maximum) geoid errors. As compared with the geoid derived by GPS/levelling, the gravimetric geoid gives relative differences of about 0.3 to 1.4 ppm in flat areas, and 1 to 2.5 ppm in mountainous areas for distances of 30 to 200 km, while the absolute difference (1) is about 5 cm and 20 cm, respectively.A optimal Wiener filter is introduced for filtering of the gravity anomaly noise, and the performance is investigated by numerical examples. The internal accuracy of the gravimetric geoid is studied by propagating the errors of the gravity anomalies and the geopotential coefficients into the geoid undulations. Numerical computations indicate that the propagated geoid errors can reasonably reflect the differences between the gravimetric and GPS/levelling-derived geoid undulations in flat areas, such as Alberta, and is over optimistic in the Rocky Mountains of British Columbia.Paper presented at the IAG General Meeting, Beijing, China, August 8–13, 1993.     

非均匀对流边界层的地转强迫流动和动量输送

用大涡模拟方法研究地转强迫下的对流边界层流动和地表热力非均匀性影响.模拟重现了典型对流边界层的平均风廓线和动量通量垂直分布.地表热力非均匀性对区域平均风速和动量通量分布无明显影响,但边界层内的局地流动性状和湍流动量输送情况有系统性的改变.下风较热区近地面风速增强而高空流动受到阻塞,上风较冷区之上情况则正好相反.对应于平均流动场的畸变,地表较热区之上边界层大部可以出现动量向上输送的情况,较冷区成为大气动量下传的主要通道.地面应力在较热区增强、较冷区减弱的趋势明显.     

GPS-RTK技术监测露天矿边坡的研究与实践

介绍了GPS—RTK露天矿边坡监测系统基本情况，阐述了GPS—RTK技术监测露天矿边坡的过程及技术要点。     

二维小波变换在地震勘探面波消除中的应用

在深层油气勘探中，针对深层地震数据的特点，我们利用二维小波变换技术易于分离信号和噪声的特点，将其应用于东部深层地震资料的处理中，对面波的消除取得了令人满意的结果，大大提高了深层地震资料的信噪比。