测井方法测定含煤地层的岩石弹性参数

本文论述了利用声波全波列数字测井资料提取横波的两种方法:子波逼近法和相似相关法。根据测井获得的纵波、横波和密度资料,计算了岩石的弹性模量,所得结果有足够的精度,为煤矿生产和建设提供了有用的岩石物理力学参数。文中还讨论了用静态法和动态法所测得的弹性模量存在的某些差别。     

晶体点阵参数最小二乘法计算程序

作者以最小二乘法理法导出了晶体点阵参数计算的公式,并顾及了X射线粉晶衍射图测定所引起的系统误差修正,从而得到点阵参数的最佳估值。以导出的公式为数学模型编制了PC-1500微机的扩展BASIC语言程序,可适用于各晶系点阵参数的计算,使用方便。     

A SEARCH TECHNIQUE FOR CHOOSING OPTIMUM PARAMETERS IN NUMERICAL WEATHER PREDICTION

The steepest descent(or ascent)search is employed for finding optimum diffusion coefficients in T42L9Gmodel,with a view to improving the model's computational stability or prediction accuracy.The method of thesteepest descent search is first described,in which the golden section search is chosen as the fundamental one-dimensional search used in the multi-dimentional steepest descent search,and then the optimization of the dif-fusion coefficients is described.     

STUDY OF THE POSSIBILITIES OF USING AN AIR MASS TRANSFORMATION MODEL IN TAIYUAN

An AMT-model,consisting of a trajectory model and a one-dimensional boundary layer model,is tested fortrajectories arriving in Taiyuan to study the possibility of using it in Taiyuan.The sensitivity of the model tothe different processes was studied.Some parameters of the model were modified for the purpose of forecast-ing in specific mountainous terrain and dry climate conditions.Results of examples which we have workedout for Taiyuan circumstances for the periods of July(summer)1985 and January(winter)1986,show that the12h runs of the AMT-model are able to reproduce(on historical data)the sounding of Taiyuan.The AMT-modelcontributes fruitfully to short-range weather forecasts(12—36h ahead)during periods of severe air pollution andwhen cold waves occur.     

菏泽5.9级地震前后三项地震活动性参数的空间动态演化

用地震活动性参数（地震频度Ｎ，地震能量Ｅ和地震ｂ值）的二维空间等值线计算机扫描技术，系统地追踪了１９８３年菏泽５．９级地震前后三项地震活动性参数的空间动态演化情况。结果表明，菏泽５．９级地震前１－４年，河北平原断陷南部地区特别是其东界聊考断裂带地震活动异常增强，地震频度增高，地震能量释放加速而地震ｂ值降低；地震活动增强区的长度约２００余公里，未来主震发生于地震活动增强区的边缘；震后约一年左右震中周     

BANDPASS FILTERING ANALYSIS WITH GAUSSIAN WEIGHTING FUNCTION IN TWO-DIMENSIONAL FIELDS

This paper examines the response of the bandpass filter with Gaussian weighting function to arbitrarytwo-dimensional fields and proposes a new concept of relative response function.Based on the properties of relative re-sponse function,satisfactory weighting parameters C_1 and C_2 are obtained.By studying two cases,the procedure of us-ing structure function curves to choose the maximum response wavelength is formulated.It is shown that bandpass fil-tering offers some improvements to the analysis and forecast of mesoscale weather processes.     

THE STUDY OF HIGH EFFICIENT AgI PYROTECHNICS AND THEIR NUCLEATING PROPERTIES*

Two kinds of high efficient Agl pyrotechnics BR-88-5 and BR-91-Y have been developed.The tests in the cloud chamber show that the AgI ice nucleating effectiveness can reach up to 10¹⁵/g,and the BR-91-Y has even higher ice nucleating rate.Two kinds of foreign AgI pyrotechnics have been made according to the given formulations and also tested in the cloud chamber for comparison.X-ray diffraction analysis for the aerosols produced by burning BR-91-Y shows that AgI in acrosols still retains the hexagonal crystal form and the lattice parameters are smaller than those of pure AgI and other AgI composite nuclei,and closer to ice.Combining with the other tests,the reasons for the high efficiency of BR-91-Y have been discussed.     

A digital model to evaluate the water balance in a typical hardrock environment

A digital model was designed and developed to study the water balance situation in a typical hardrock environment near Hyderabad, Andhra Pradesh. The model was calibrated over a period of six years with observed field hydrographs. An optimum error factor of 0.001 m was chosen and the computer took 47 iterations for outputting the results with the desired accuracy. Prognostic studies were carried out with progressively increasing draft conditions and water levels were observed to be declining even when the draft was less than the recharge. The analysis of the experiments further amended the belief of the earlier workers.     

完整资料的地震危险性参数估计及敏感性分析

应用考虑震级不确定笥和资料完整性估计地震危险性参数的极大似然法，分别采用１９４０年和１０７０年至１９９３年完整的地震资料，计算了汾渭地震带及陕南地区的地震危险性参数。结果表明：利用近几十年来的完整地震资料结合研究区历史上发生的最大地震，可以得到较为可靠的地震危险性参数；参数敏感性分析表明，完整震级不确定性对β的影响较小；随震级不确定性的增大地震年发生率减小；在资料完整的前提下，震级下限在一定范围内     

安徽地区地震波衰减、场地响应及震源新参数的测定

根据安徽数字地震台网7个地震台的143条波形资料,研究了安徽地区的衰减模型和各台站的场地响应。采用三段几何衰减模型拟合,得到了安徽及邻近地区的几何衰减函数,得到安徽地区非弹性衰减Q值随频率f的关系为Q(f)=235.3×f0.616;7个台站的场地响应均无明显的放大效应,这与它们均处于岩石地基相符;并在本地区地震预测研究中尝试使用新参数,进行了初步的应用。