云南元江金矿矿床模型及矿产经济

随着湿法冶金技术的发展，过去圈定氧化矿的工业指标在当前技术经济 条件下过高，已将大量矿石划为废石，既浪费了资源,又污染了环境。通过建立矿床模型，优化工业指标，重新圈定矿体和计算储量，增加金储量10t，为提高矿山生产的经济效益，充分合理利用矿产资源提供了科学依据。     

1995年5月27日俄罗斯萨哈林岛强烈地震概况

１９９５年５月２７日俄罗斯远东地区萨哈林岛发生７．５级强烈地震，造成生命和财产的严重损失，这是俄罗斯历史上受灾最严重的一次地震。本文概述了这次地震的情况，内容包括：震源参数，震灾情况，救援情况，地震成因和地震趋势，以及俄罗斯的地震研究情况等。     

DETERMINATION OF AERODYNAMIC PARAMETERS OF CROP CANOPIES WITH A CENTER-OF-PRESSURE METHOD

Using data on leaf area density and wind profiles above and within canopies of wheat,rice,soybean and corn,thecenter-of-pressure method (CPM),originally proposed by Thom (1971),is first validated in the field.Aphysically-based model for directly calculating zero-displacement height (d) is derived.The comparison between thefriction velocity (u_*) estimated with CPM and that with eddy correlation technique shows that CPM not only works wellin the field,but also produces more steady and accurate estimates of aerodynamic parameters (which are hardly affectedby atmospheric thermal stability),than those with the widely-used log-profile fitting method in diabatic atmosphere.The results presented in this paper also demonstrate that the ratios of d,z_0 to crop height h usually vary with canopy ar-chitecture,atmospheric stratification and turbulent exchange intensity,and are not just constants as commonly assumedor used.d/h raises with an increase of relative height of the maximum foliage layer and wind extinction coefficientwithin the canopy.Only for crops with short stem and moderate foliage density,can the relations d= 0.64h,z_0=0.08hkeep stable.In addition,for long stem crops or sparse canopies,the fairly large shear stress at the soil surface and the va-riation of the exponent in the relationship between drag coefficient and wind speed undoubtedly influence the accuracyof CPM to a certain extent.     

The Speciation of (CH3)2Sn2+ in Electrolyte Solution Containing the Major Components of Natural Waters

Hydrolysis constants of dimethyltin(IV) cation, in different salt solutions (CaCl₂: 0.15 I 0.90; MgCl₂: 0.30 I 0.60; NaCl-–NaClO₄, NaCl-–NaNO₃ mixtures: I = 3; NaCl-–Na₂SO₄ mixtures: I = 1 mol dm^-3) were determined by potentiometric ([H⁺]-glass electrode) measurements. These data, together with previous data (De Stefano et al., 1996b) were interpreted in terms of DHT (Debye–Hückel type) and Pitzer equations. The mixed electrolyte solution results also allowed us to obtain and parameters for the Pitzer equation. Calorimetric measurements were made at different ionic strengths in order to find the temperature dependence of hydrolysis constants and of the relative interaction parameters. The body of results allows us to determine the speciation of natural waters in a wide range of ionic strengths and temperatures.     

东北大陆文史记载有感地震

本文在综台分析和整理地震史料的基础上,对东北大陆文史记载的150次有感地震做了研究,估定了其参考性的基本参数。     

数值方法在钻进模拟试验中的应用

用不同规格的硬质合金取心钻头在同一种岩石中进行钻进模拟试验，通过对试验数据的整理，利用数值分析方法，建立在最优钻进规程下的钻头直径与机械钻速之间的相关方程。     

基于力学模式的动态大地测量数据反演研究

本文在文献（１）的基础上，进一步研究了基于力学模式动态大地测量反演理论。首先提出了力学模式下动态大地测量反问题的六种形式，导出了第一，二类动态大地测量反问题的线性最小的二乘解，研究了动态大地测量反问题的妥；最后，结合数值例子，讨论了利用地壳垂直形变数据反演地壳断层错动的一种方法。     

大气湍流的非线性动力学参量与其经典统计量之关系

本文利用大气边界层近地层中观测得的风和温度时间序列讨论计算了湍流的非线性动力学统计参量与其经典统计量的关系。初步结果表明:当层结稳定参数z/L处于-0.7相似文献   

自流观测井泄漏的处理与水动力参数的试验研究

本文以苏１８井为例介绍了自流井泄漏的处理技术与井口动力参数的试验结果，采用钻也漏仪确定泄漏部位，内衬套管对环状间隙灌浆的堵漏技术，效果良好。采用不同泄水孔断面积对井口水动力参数进行了系列观测试验，对试验结果了分析，并推导了各参量间的函数关系，两者相当吻合，可以互相印证。