VARIATIONS IN THE TELECONNECTION INTENSITY INDICES AND THEIR REMOTE RESPONSE TO THE EL NINO EVENTS IN THE NORTHERN HEMISPHERE*

In this study,the monthly and seasonal teleconnection intensity indices of the Pacific/North American(PNA),Western Atlantic(WA),Western Pacific(WP),Eastern Atlantic(EA) and Eurasian(EU) patterns for the period from 1951 through 1990 are calculated.On this basis,their climatic variations and the relationship between the five teleconnection intensity indices and the El Nino events are examined.It is noted that when El Nino is at its mature stage(winter),the weak WP pattern is mainly characteristic of the circulation and the strong PNA pattern is the next.In summer when El Nino occurs and develops,the strong EU,weak WP and weak WA patterns are the main characteristics without the PNA circulation anomalies.Finally,by the nonlinear mapping method a nonlinear mapping diagram is established for diagnosing El Nino using three summer teleeonuection intensity indices and May and August Southern Oscillation Indices(SOIs).Thus,the El Nino phenomenon occurring in 1991 is diagnosed.Besides,the winter atmospheric circulation of the 1991/1992 El Nino is found to be the weak WP pattern and the PNA pattern is also weak.     

缓倾岩层洞穴系统发育模式的模拟试验

为模拟洞穴系统的发生、演化及分布规律。对缓倾岩层(倾角<15°)裂隙疏散或密集及多层或单层含水层结构的模型所做的溶蚀试验表明:均匀介质含水层在平面上洞穴发育呈不均匀状况,剖面上以浅饱水带及承压含水层顶板附近洞穴较发育;在裂隙不发育或不贯通时洞穴发育受层面裂隙控制;在缓倾岩层中,洞穴发育循反倾向的方向逐渐减弱。     

北京大庄科花岗质杂岩体中包体定位的动力学机理之探讨

北京大庄科花岗杂岩普遍含有微粒—细粒暗色包体,其中石英闪长岩和石英二长岩含包体较多,二长花岗岩含少量包体,淡色花岗岩和闪长岩含包体甚少。在含包体较多的岩体内,包体在岩体中部的分布量较多。计算结果表明,包体越小沉浮半径愈大、参数F值愈小的岩体,含包体愈多;岩体内岩浆上升速度大、包体下沉速度小以及F值小的部位,包体滞留量大。各岩体包体分布的多少,是由包体在寄主岩浆内的扩散系数、混合程度、岩浆携带力和基性岩浆混入量等因素综合决定的。     

Scattering of plane sh waves by a semi-cylindrical hill

A new analytical method is presented to study the problem of scattering of plane SH waves by a semi-cylindrical hill in an otherwise homogeneous, isotropic and elastic two-dimensional half-space, using the series of wave functions and a new expansion technique. The results obtained show that (1) the hill has quite considerable effects on ground motions for both the points on the hill and its environs, (2) these effects depend mainly on the frequency, the angle of wave incidence and the ratio of radius of hill to one-half the wave length of incident waves, and (3) prominent and depression topographies having equal form and radius for the same incident waves would cause quite different mechanisms of wave propagation in both response performance and magnitude. The results, doubtless, would be useful for further deepening knowledge of the effects of prominent topography on seismic ground motion and for testing the accuracy of various approximate methods so far available.     

四川龙门山地区阳新组灰岩地质特征及用途

二叠系阳新组灰岩厚度240~350 m，走向延伸大于50 km，出露面积15 km²以上，资源储量极为丰富.研究区0.6 km²范围内资源量为5193×10⁴ t.阳新组灰岩CaO含量49.87%~55.74%，MgO含量0.24%~2.80%，SiO₂含量0.38%~5.80%之间，SO₃含量0.01%~0.40%，K₂O+Na₂O含量0.02%~0.12%，均达到Ⅰ级水泥用料要求.饱和抗压强度41.6~82.4 MPa，坚固性1%~3%，压碎指标8.2%~9.6%；所有指标均符合建筑石料用要求.对阳新组灰岩地质特征、物理化学指标的分析评价显示，其可广泛运用于水泥、建筑石料等领域，具有重要的经济价值和意义.     

三分量地震检波器的转换公式及误差分析

54.74°型三分量检波器在某种环境下按置常发生偏差,本文研究在偏差情况下的信号转换公式及误差分析。     

秦巴地区中——酸性浅成小岩体与金矿

本文叙述了秦岭大巴山地区中——酸性浅成——超浅成侵入——爆破“杂”岩体的地质特征及其分布;叙述了与岩体有成生联系的斑(玢)岩型、矽卡岩型、爆破(隐爆——坍塌)角砾岩型、构造蚀变岩型、热液脉型等类型金矿的地质特征;总结了岩体的成矿模式,同时指出了矿床类型和共(伴)生元素的成矿系列;指出分布在秦巴地区的5个印支期——燕山期岩体带中的21个小岩体群,其中数百个小岩体及其附近有找到多种类型金矿的可能,预测其找矿前景乐观,金矿资源潜力很大。     

金-四(4-三甲铵苯基)卟啉配合物吸附波研究及其应用

在0.24mol/L酒石酸钾钠-0.15mol/L KOH及pH 9.2的NH_4Cl-NH_3·H_2O介质中,Au(Ⅲ)与四(4-三甲铵苯基)卟啉(简称T(4TMAP)P)的配合物于-1.72V(vs·SCE)处产生一灵敏的吸附波,波高与Au浓度在0.001～0.25μg/ml内呈直线关系。用泡沫塑料分离富集后,测定地质样品中的痕量Au,结果满意。     

1991年淮河流域农村洪涝灾情分析

本文从灾害系统的概念出发,分析了1991年淮河流域苏皖地区农村洪水的雨情、水情和灾情,并探讨了这次洪水对农村造成严重灾情的原因。     

山区植被类型信息提取方法研究

根据遥感图像的光谱信息和空间信息特征及不同植被的分布规律,研究利用计算机处理技术提取山区植被类型的方法。分类过程采用四个步骤完成：①均一目标的象限四分树提取分类；②多光谱数据的最小距离分类；③综合利用波谱曲线的形态和地形数据进行分类；④高程数据修正分类。在分类处理过程中,分别利用了图像的空间信息、光谱信息以及地形数据。利用该分类方法在实验小区内进行植被类型提取试验,其精度为90%.与最大似然分类方法所得结果相比较,其分类精度提高了10%.