华北板块北缘活动带元古宙构造岩片

新的研究证实 ,华北板块北缘残存一条元古宙构造岩片堆集带 ,包括古元古代、中元古代、新元古代等多期构造岩片。并相伴有 180 0Ma±、140 0Ma±、10 0 0Ma±、6 5 0Ma±的花岗岩类的侵入活动和构造变质成矿等热事件的年代记录 ,并在华北板块北部金镶边带中保存了相一致的信息 ,揭示了它们是陆缘多期拼贴造山的产物。这为超大陆旋回 ,特别是元古宙两次超大陆的聚合与裂解及其构造演化过程的研究提供了良好的野外实验园地 ,并为元古宙、特别是古元古代大陆的增生及Rodinia超大陆在北半球的存在或构造响应提出新的课题。     

湘中锡矿山锑矿床成矿物质来源的同位素示踪

本文利用放射成因同位素（Pb、Sr)和轻稳定同位素（C、O）对锡矿山超大型锑矿床的成矿物质来源进行了示踪，从物源角度揭示了其在规模成矿、元素发生超常富集的原因。研究表明，锡矿山锑矿床的成矿物质不可能是来自赋矿围岩；深部地幔和基底都卷入了该矿的成矿作用；富Sb的交代型地幔和富Sb的元古界基底为其大规模成矿提供了充足的矿源，两者是形成锡成山超大型锑矿床的前提条件。     

The null distribution of sample serial correlation coefficient

 The null distribution of the lag-k sample serial correlation coefficient (r _k , k=1,2,3) was investigated by Monte Carlo simulation. For a time series with normal, exponential, Pearson 3, EV1 (Gumbel), or generalized Pareto (GP) distribution type, the null distribution of its r _k can be approximated by the normal distribution with mean −1/(n−k) and variance 1/(n−1). But for a time series with the lognormal, EV2 or EV3 (Weibull) distribution type, the null distribution of r _k is skewed distributed. In such cases, a simulation technique is suggested to construct percentile confidence intervals at a given significance level.     

Power of the Mann–Whitney test for detecting a shift in median or mean of hydro-meteorological data

 The non-parametric Mann–Whitney (MW) statistic test has been popularly used to assess the significance of a shift in median or mean of hydro-meteorological time series. It has been considered that the test is more suitable for non-normally distributed data and it may be not sensitive to the distribution type of sample data. However, no evidence has been provided to demonstrate these. This study investigates the power of the test in various circumstances by means of Monte Carlo simulation. Simulation results demonstrate that the power of the test is very sensitive to various properties of sample data. The power depends on the pre-assigned significance level, magnitude of a shift, sample size, and its occurrence position within a time series; and it is also strongly affected by the variation, skewness, and distribution type of a time series. The bigger the magnitude of a shift, the more powerful the test is; the larger the sample size, the more powerful the test is; and the bigger the variation within a time series, the less power the test has. The test has the highest power if a shift occurs at the midpoint of a time series. For the samples with different distribution types, the power of the test is dramatically different. The test has the highest power for time series with the extreme value type III (EV3) distribution while it indicates the lowest power for time series with the lognormal distribution.     

河北省粮食生产灰色关联动态分析

根据 194 9～ 1998年各县 (市 )的统计资料 ,分析了河北省近 5 0年粮食生产的变化历程和空间差异 ,运用灰色系统理论对影响河北省粮食生产的诸因素进行关联动态分析 ,量化了粮食总产量与诸因子的关联程度 ,指出粮食单产、有效灌溉面积和粮食播种面积是影响河北省粮食生产的最重要因素 ,并提出了实现河北省粮食生产可持续发展的基本途径 ,为今后河北省农业可持续发展提供了参考依据     

云南松根系对土壤牵引效应测试系统的设计与实现

目前在野外对云南松根系与土壤的机械效庆的研究，由于测试研究受多种因数的影响，开展研究困难较大，研究精度也受到一定程度的影响，这对较深入的描述根系与土壤相互作用的机械效应带来一定的困难。本文基于这一实际，设计了能在室内和野外进行实时测试分析的测试系统，并配套了支持PCMCIA插槽的DAQP－12型模数转换（A／D）卡，以及直流电供电的QT－300型调理装置。结合所配套的硬件，利用Visual C在Windows95/98平台编写了软件，经过实际试验测试，系统各项性能能够满足云南松根系对土壤的机械效应研究的测试分析要求。     

东南极格罗夫山变基性岩初步研究

东南极格罗夫山存在一套经历了峰期麻粒岩相变质作用的镁铁质麻粒岩和斜长角闪岩。对含石榴石的镁铁质麻粒岩的详细研究则显示了近等温降压 (ITD)的顺时针PT演化轨迹 ,与拉斯曼丘陵有相似的演化历史。岩石的主量元素组成和玄武岩一致 ,并且具有拉斑玄武岩演化趋势。进一步的地球化学研究表明 ,这套玄武岩为洋岛型玄武岩 (OIB)和洋中脊型玄武岩(MORB)的组合。OIB型具有大体类似的地球化学性质 ,它们均富集Ti(TiO2 =2 .68% )、REE( =2 0 2 μg/g)、LREE[(La/Yb) N=4.8]、Ti/Y( =343)、Zr/Y( =3.1 ) ,具洋岛玄武岩的特征 ,推测岩浆来源于富集地幔源区 (EM)。而MORB型以低Ti (TiO2 =1 .1 %— 1 .31 % ) ,明显低于OIB的P的含量 (P2 O5=0 .1 %— 0 .2 % ) ,低REE ( 4 7— 93μg/g)、LREE/HREE( 2 .2 7— 2 .5 4 )、(La/Yb) N( =1 .30— 1 .62 )为特征 ,具洋中脊玄武岩的特征。MORB和OIB组合的出现说明在泛非期该区可能存在过洋盆。     

聚丙烯酸/绢云母超吸水性复合材料的合成与性能研究

通过丙烯酸与绢云母超纫粉的接技共聚，制备出吸水率为1100倍的超吸水性复合材料。研究了制备过程中各种影响因素，结果表明，当绢云母超纫粉的用量为10％—20％，丙烯酸单体的浓度为25％，单体的中和度为65％，交联剂用量为0．1％，引发剂用量为1．5％，接技共聚反应温度为70℃时，可获得较好的结果。本文讨论了上述反应因素对复合材料吸水率的影响，并探讨了吸水材料的颗粒大小对吸水性能的影响。     

Noble Gases in the Lunar Regolith

The most fundamental character of lunar soil is its high concentrations of solar-wind-implanted elements, and the concentrations and behavior of the noble gases He, Ne, Ar, and Xe, which provide unique and extensive information about a broad range of fundamental problems. In this paper, the authors studied the forming mechanism of lunar regolith, and proposed that most of the noble gases in lunar regolith come from the solar wind. Meteoroid bombardment controls the maturity of lunar soil, with the degree of maturation decreasing with grain size; the concentrations of the noble gases would be of slight variation with the depth of lunar soil but tend to decrease with grain size. In addition, the concentrations of noble gases in lunar soil also show a close relationship with its mineral and chemical compositions. The utilization prospects of the noble gas ^3He in lunar regolith will be further discussed.     

层序地层学在区域地质调查中的应用

在四川北部广元地区1：5万区域地质调查填图工作中，应用层序地层理论和方法，对测区古生代一中生代海相沉积地层进行了详细划分，利用层序地层对岩石地层单位界线进行了优化，从而提高了测区地层划分对比的精度和预测地质体的能力，使岩石地层单位的划分更为合理。建立了测区岩石地层单位，并论述了层序地层与岩石地层的相关性，提出了层序地层在沉积岩区1：5万区调地质图面的表达方式。