Application of integrated geophysical interpretation on accumulation body

Integrated geophysical interpretation is a method of combinating different geophysics prospecting methods based on different physical properties of accumulation. As different geophysical methods own different interpretations and varying detection accuracies, the key issue becomes how to integrate the results of several geophysical methods to corrently carry out a comprehensive explanation. Based on different geophysical results, the authors proposed an integrated geophysical explanation method and successfully applied it in practical engineering problems.     

Removal of Cadmium Ions from Aqueous Solution by Silicate-incorporated Hydroxyapatite

This article reports a preliminary research on silicate-incorporated hydroxyapatite as a new environmental mineral used to remove cadmium ions from aqueous solutions. The silicate-incorporated hydroxyapatite was prepared by coprecipitation and calcining, and silicate was incorporated into the crystal lattice of hydroxyapatite by partial substitution of phosphate. The amount of cadmium ions removed by silicate-incorporated hydroxyapatite was significantly elevated, which was 76% higher than that of pure hydroxyapatite. But the sorption behavior of cadmium ions on silicate-incorporated hydroxyapatite was similar to that of pure hydroxyapatite. Morphological study revealed that silicate incorporation confined the crystal growth and increased the specific surface area of hydroxyapatite, which were in favor of enhancing the cadmium ion sorption capacity of the samples. Incorporation of silicate into hydroxyapatite seems to be an effective approach to improve the environmental property of hydroxyapatite on removal of aqueous cadmium ions.     

地质成分数据统计分析

地质学研究中遇到大量成分数据,其各行之和相同,因而组分相关性中含由闭合效应引起的伪相关,而且不服从正态分布,给统计分析带来了很大困难．分析了前人提出的一些识别成分数据中伪相关的方法的缺欠,提出对数比变换作为成分数据统计分析的基本步骤的依据、优越性及存在问题;指出闭合造成的信息损失包括基的相关结构的信息,是任何方法都找不回来的．今后应着重分析有哪些信息还保留在成分数据中,并有针对性地寻找萃取这些信息的方法．     

浅海爆炸声传播损失及简正波分离实验研究

文章简要介绍了浅海声传播损失的研究背景和基本理论方法。通过1/3倍频程滤波对浅海爆炸宽带信号的不同频段在浅海的传播损失情况进行了分析,描述了浅海环境对声传播损失的影响;同时在不知道先验信息的条件下,利用垂直阵声压数据成功地进行了简正波分离,并与理想条件下Kraken简正波模型计算出的结果进行了比较分析。     

管角螺Hemifusus tuba(Gmelin)稚贝在不同盐度下的生长和存活研究

在水温28.6—29.5℃、pH8.2条件下,研究了管角螺Hemifusus tuba稚贝[(壳高19.5±1.23)mm、体重(661.4±48.6)mg]在不同盐度下的生长和存活,并用二点法计算出最适宜存活和生长的盐度范围。结果表明,管角螺稚贝适宜存活盐度和最适存活盐度分别为17.7‰—40.8‰和25.1‰—35.9‰,适宜生长盐度和最适生长盐度分别为17.5‰—39.9‰和27.8‰—33.2‰。在最适生长盐度范围内,稚贝壳高日平均增长率为0.358—0.397mm.d 1,体重日平均增长率为44.64—49.09mg.d 1。超出上述范围,其存活率下降、生长率降低。稚贝在盐度17.0‰和41.3‰的海水中适应20d后再分别移至盐度14.0‰和45.0‰的海水中,72 h后存活率分别为84.0%和96.0%,而直接把生活在盐度为30.5‰中的稚贝放入到盐度为14.0‰和45.0‰的海水,72h后其存活率为8.0%和0,可见稚贝对盐度的适应能力与原生活海水盐度有关,经过驯化后的稚贝能够扩大对盐度的适应范围,提高对盐度的耐受力。     

不等式约束对平差结果的影响分析

不等式约束平差模型能够改善平差效果,在大地测量中的运用越来越广泛。平差参数估计已经有了很多有效的算法,但是不等式约束对平差的影响以及参数的统计性质还没有解决。针对这一问题,运用概率统计的思想,证明了不等式约束平差是一种有偏估计,给出了参数的期望和方差表达式。与无约束平差比较,证明不等式约束参数的方差恒小于无约束时的情形。用一个简单的算例,说明了不等式约束平差参数的4个统计性质,指出了以往研究中,将有效约束看做等式约束进行精度评定的不足。     

一种基于多约束的空间聚类方法

借助Delaunay三角网构建空间邻近关系的优势,通过施加不同层次、不同类型的约束,提出一种空间聚类的新方法。通过试验分析与比较发现,该算法可以探测复杂结构的空间簇,对噪声点稳健,并且能够同时顾及实体间空间位置与专题属性的相似性。     

Water quality and eutrophication in the Guangzhou Sea Zone of the Pearl River estuary

To gain a better understanding of water quality and eutrophication,we investigated the seasonal and spatial distribution of water quality at 17 stations in the Guangzhou Sea Zone (GZSZ).Nutrients,chlorophyll-a (Chl-a),salinity,chemical oxygen demand,and other physical and chemical parameters were determined in February,May,August and October from 2005 to 2007.The concentrations showed ranges of 93.2-530.4 μmol/L for dissolved inorganic nitrogen (DIN),0.62-3.16 μmol/L for phosphate (PO4-P) and 50-127 μmol/L ...     

南黄海构造样式的特征与含油气性

新一轮国土资源大调查项目的地震资料揭示,南黄海不同构造层内发育各具特色及多种类型的构造样式,主要表现有压缩、伸展和反转构造样式,分别有基底卷入型的压性断块和冲断构造、挤压背斜构造、潜山构造、穹隆构造、张性断块构造以及断层扩展反转褶皱构造、盖层滑脱型褶皱反转构造、单条冲断系负反转构造等。本文着重从剖面形态和平面展布分析各构造样式的特征,追溯它们在时、空上的相互联系和叠置关系,阐述印支、燕山和喜马拉雅运动对构造样式的作用,认为这些构造样式是地壳挤压、伸展和走滑联合作用的结果,并探讨了油气赋存的规律。     

郴州市枞树板铅锌银矿床地质特征

该矿床主要受北东向断裂构造控制，矿化围岩为震旦系浅变质岩，矿脉成群成带出现，主矿脉延伸大、品位富。具有较大的找矿前景。