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.     

液化判别的应力法与刚度法之比较

应力法和刚度法是判别土层液化的两种重要方法。本文在简要介绍判别原理的基础上,对两者作了比较,並结合工程实例和饱和标准砂样进行了对比。在相同的条件下,两种方法分析所得的抗液化安全系数是不相同的。本文提出的结论,就如何正确应用这二种方法提供了依据。     

砂金粒度特性研究

本文介绍砂金粒度分析采用筛析-镜测的联合粒度分析方法,并提出砂金粒度的分级意见。     

信阳群的解体及其大地构造意义

通过对原信阳群标准地层剖面的深入研究,查明该岩石—地层单位实属变形十分复杂的构造地层体。古生物资料表明,原信阳群南湾组确属中—晚泥盆世地层;而同位素定年结果则显示,原信阳群龟山组纯系前泥盆纪变质杂岩组成的构造地层体。据此,笔者认为原信阳群应解体。本文着重从岩石、构造分析入手,对新解体出的不同地质体分别就其地层涵义、构造归属作了较系统的论述,并扼要阐明各自发展演化的大地构造意义。