广西雷电活动的方向性变化及其应用

通过对广西 90个气象台站 196 1- 1998年的雷电记录进行统计分析 ,得出 2～ 6月份广西大多数地方的雷电活动以 SW方向最为频繁 ,7～ 9月则以 SE方向最多 ;讨论应用雷电频率、土壤电阻率、相对高度 3个要素定性判断雷击危险性问题。     

结构性对琼州海峡软土压缩特性的影响

天然软土大多具有结构性，且结构性因地而异。通过室内试验研究了结构性对琼州海峡两种海洋软土压缩特性的影响，并结合琼州海峡铁路轮渡工程，讨论了土结构性的存在对该工程防波堤地基处理工程效应的影响。     

原发性中枢神经系统淋巴瘤的二例报告

本文报导了２例少见的颅内肿瘤－非何杰金化恶性淋巴瘤。通常认为和免疫抑制剂的使用和获得性免疫缺陷有关。该病无特异的临床症状，术前极难确诊。ＣＴ形像类似脑膜瘤，ＣＴ导向下的针刺活检或手术活检能获得更确的组织学诊断。目前提倡组织学确诊后放疗联合进行。     

神经源性尿崩症（附11例报告）

本文报告了我院１９９０．１２－１９９４．１２月四年间在神经外科收治的１１例社会源性尿崩症，并对其病历，分类，病理转归，ＣＴ和ＭＲＩ表现，诊断治疗进行了讨论，并认为脑垂体后叶素是目前临床治疗神经源性尿崩症的首选药物。     

90年代全球环保浪潮对世界贸易的影响

本文阐述了90年代全球环保浪潮对世界贸易的影响，重点分析了新的环境和贸易政策对世界贸易的制约，绿色产业的发展及在优化世界贸易商品结构中的作用，“绿色壁垒”下发展中国家面临的新挑战。     

碱土金属速差动力学分析法及其应用

本文介绍了速差动力学分析法测定碱土金属含量的原理，分析步骤以及在测定过程中所需要注意的问题，并给出了NaCl、KCl分析试剂中Ca(2+)、Mg(2+)的含量以及三元混合物中的动力学测定结果。     

Mineralkogical and Petrochemical Characterisitics and Genesis of Laoniugou Geneiss in Jiapigou Gold Mine,Jilin Province

Detailed mineralogical and petrochemical studies show that the Laoniugou gneiss of the Jiapigou gold mine is composed mainly of plagioclase gneiss and irregular to lentiform plagioclase amphibolite melanic enclaves.The major element contents show an obvious bimodal and trondhjemitic series evolutional trend.This situation is significantly different from that encountered in bimodal calc-alkalic volcanic rocks in the rift-type Archaean greenstone belt.The contents of Rb,Sr and Ba are 7-21 ppm,153-363ppm and 201-1451 ppm respectively ,close to those of common Archaean grey gneisses.All the samples of plagioclase gneisses show positive Eu anomalies (even up to 4.6).The protoliths of the plagioclase gneiss are high-Al2O3 trondhjemitic series rocks,belonging to typical TTG of Archaean high-grade metamorphic terrain .The gneiss is quite similar to the B-type Amitsoq gneiss of W.Greenland .The authors believe that the plagioclase amphibolite enclaves are the relics of ancient oceanic crust while the plagioclase gneiss is the TTG ancient intrusive rock resulting from partial melting of the oceanic crust.     

一类伪抛物型方程的非局部边值问题

本文利用Riemann方法和压缩映像不动点方法证明了问题存在唯一的正则解,其中η(x,t、h(x)、β_i(t),μ_i(t)(i=1,2)是满足适当条件的已知函数。     

城市系统规划与遥感、地理信息系统技术

本文以武汉市洪山区综合发展战略规划中遥感与地理信息系统的应用研究为例,阐述城市系统的复杂性、地域性和动态性,航空遥感在城市系统调查中的作用和优越性,地理信息系统在城市系统诊断、分析、评价、规划与管理中的应用。本研究侧重于以系统工程为基础的地域性规划,强调城市系统用地布局的合理性。     

An Experimental Melting—crystallization Study on Basalt at High Pressures

A series of melting-crystallization experiments on alkali basalt samples from Minqing, Fujian Province was carried out in dry and waterbearing systems at high pressures. A high-pressure melting curve was obtained. The results indicate that clinopyroxene crystallized from basalt melt at 13.5–23.7 kbar. spinel at 23.7–28.6 kbar and garnet at > 28.6 kbar. With increasing pressure, the CaSiO₃ contents of clinopyroxenes increase; and the FeSiO₃ decreases, but the chemical composition of garnet does not show any significant difference. The minerals are larger and euhedral in the water-bearing system. Therefore, we consider that natural megacrysts of the basalt can crystallize from the water-bearing basalt magma at high pressure. So the megacrysts may be derived from the upper mantle as a result of magmatic crystallization-fractionation under high pressure. This project was financially supported by the National Natural Science Foundation of China.