地震勘探数据处理的一种算法——分布参数系统最优理论的应用

本文将根据地震数据识别地层结构问题归结为分布参数系统的最优化问题,利用脉冲变分原理给出了一个新的算法,此算法与文献[4]中算法相比较,计算效率要高。     

Determination of atmospheric precipitable water and humidity profiles by a ground-based 1,35 cm radiometer

In four seasons of 1982 measurements of atmospheric water vapor profiles and total precipitable water were made by a ground-based microwave radiometer operating at 1.35 cm wavelength. All data were processed by using Monte Carlo method. The statistical results of more than seventy cases show that the relative error compared to the radiosonde observations is 5.3% for the total precipitable water vapor and less than 20% for humidity profiles in the lower atmosphere below 750 mb. In addition, the relationship between the weather background and both the humidity profiles and the total precipitable water vapor were analyzed.     

Scattering of plane SH waves by a cylindrical alluvial valley of circular-arc cross-section

A closed-form solution of two-dimensional scattering of plane SH waves by a cylindrical alluvial valley of circular-arc cross-section in a half-space is presented using the wave functions expansion. The solution is reduced to solving a set of infinite linear algebraic equations using the exterior region form of Graf's addition theorem. Numerical solutions are obtained by truncation of the infinite equations and their accuracies are demonstrated by convergence of the numerical results to the exact boundary condition with the increasing of the truncation order. The present solution is compared with the existing one presented by Todorovska and Lee for the same problem and their differences are analysed. Complicated effects of the depth-to-width ratio of the alluvial valley on surface ground motion are finally illustrated.     

圆弧型沉积盆地对平面SH波的散射

采用波函数展开方法给出圆弧型沉积盆地对面ＳＨ波二维散射问题的封闭级数解答。利用外域Ｇｒａｆ加法公式将解答归结为无穷代数方程组的求解。通过截断计算得到解答的数值结果，并通过连续条件的满足程度检验了截断计算的精度。将本文结果已有的近似解析解进行比较，指出了近似解答的误差来源和适用范围。给出一些典型算例说明盆地深度比对地震动的复杂作用。     

东北地区中尺度对流复合体的卫星云图特征

通过１０年（１９８３－１９９２年）卫星云图资料的分析，综合归纳了东北地区中尺度对流复合体（ＮＭＣＣ）的基本特征及其发展演变过程，由于受地理条件的影响，ＮＭＣＣ与美国大平原以及我国西北和华北平原上的ＭＣＣ有明显差别，作为一类特殊的对流性天气系统，ＮＭＣＣ与一般中尺度对流云图特征有明显差异。     

金堆城钼矿区两类不同花岗岩的关系及其成因的研究

本文证实了金堆城钼矿区存存两种不同类型花岗岩,上地壳太华群和熊耳群的重熔形成老牛山、水仙台等改造型花岗岩体.而下地壳及上地幔分熔形成金堆城等与钼矿有关的同熔型花岗斑岩,两类花岗岩在成因上直接联系.此外还探讨了东秦岭A型俯冲与本区花岗岩成因的联系     

大地震前区域地震活动迁移

本文初步分析了1966-1976年间,中国某些大地震（M_s≥7.0）前区域中小地震活动向未来大震震源区及其邻近集中迁移的异常现象。这种迁移现象反映出大震前远震源区和近震源区内地震活动交替活跃和平静的过程。 指出在大震孕育过程中的区域地震活动迁移过程,可能与区域介质强度或原有断面“闭锁”“粘结”程度存在差异有关。     

浏阳市普乐钴多金属矿床地质特征及找矿标志

"湘东北地区的钴多金属矿床,赋存于区域性北北东向断裂带的混合岩带中,矿体呈层状、似层状,沿侧伏方向长1 500m,斜长170～1 400m,厚1.02～17.63 m.剖面上钴矿体与铜矿体相间产出.钴矿体品位(10-2)Co 0.036,伴生Cu0.259、Au 0.25×10-6;铜矿体(10-2)Cu0.714,伴生Co0.015、Au0.27 × 10-6.Co、Cu互为消长关系.矿石类型主要为含钴黄铁矿石和含铜钴黄铁矿石,地表见含钴褐铁矿石.矿物成分以黄铁矿、含钴黄铁矿、黄铜矿和石英、方解石、绢云母、绿泥石为主;矿石结构构造主要有自形、半自形、他形晶粒结构、交代结构和浸染状、团块状,脉状构造;3个北东向钴异常带、北东向与北北东向断裂交汇部位、岩体接触带或顶盖,以及黄铁矿化、硅化、褐铁矿化蚀变等为湘东北地区原生钴矿床的找矿标志.     

Numerical simulations of katabatic jumps in coats land,Antartica

A non-hydrostatic numerical model, the Regional Atmospheric Modeling System (RAMS), has been used to investigate the development of katabatic jumps in Coats Land, Antarctica. In the control run with a 5 m s^-1downslope directed initial wind, a katabatic jump develops near the foot of the idealized slope. The jump is manifested as a rapid deceleration of the downslope flow and a change from supercritical to subcritical flow, in a hydraulic sense, i.e., the Froude number (Fr) of the flow changes from Fr > 1 to Fr> 1. Results from sensitivity experiments show that an increase in the upstream flow rate strengthens the jump, while an increase in the downstream inversion-layer depth results in a retreat of the jump. Hydraulic theory and Bernoulli's theorem have been used to explain the surface pressure change across the jump. It is found that hydraulic theory always underestimates the surface pressure change, while Bernoulli's theorem provides a satisfactory estimation. An analysis of the downs balance for the katabatic jump indicates that the important forces are those related to the pressure gradient, advection and, to a lesser extent, the turbulent momentum divergence. The development of katabatic jumps can be divided into two phases. In phase I, the t gradient force is nearly balanced by advection, while in phase II, the pressure gradient force is counterbalanced by turbulent momentum divergence. The upslope pressure gradient force associated with a pool of cold air over the ice shelf facilitates the formation of the katabatic jump.     

植被覆盖区1∶5万多光谱遥感找矿模式的研究--以内蒙古额尔古纳市大梁研究区为例

地面植被的发育,在一定程度上,弱化、掩盖或屏蔽了岩石和土壤的光谱和空间信息.另一方面,植物的群落、分布和生长状态与下伏岩石土壤特性和构造之间常表现出具有一定的相关性,植被的毒化往往指示矿化的可能存在,植被空间分布和地貌影像特征揭示了构造的展布特征.构造分析和毒化植被的识别是植被发育区1∶ 5万多光谱遥感地质找矿预测的最佳模式.