Usable Values of Nickel Ore and Nickel Concentrate Certified Reference Materials          下载免费PDF全文

Zhizhong Cheng  Mei Liu  Hongku Huang  Tiexin Gu  Weidong Yan  Hongli Wen 《Geostandards and Geoanalytical Research》2015,39(2):221-232

The preparation and characterisation of three nickel ores and two nickel concentrate certified reference materials are described in this paper. The samples of nickel ore and nickel concentrate were collected from the Hongqiling nickel deposit in Jilin province. The raw materials were crushed and passed through a 2.0‐mm sieve. The rough samples were then ground for 48 hr in a high‐alumina ball mill to a final size of < 0.074 mm. Homogeneity of the samples was tested by X‐ray fluorescence spectrometry (WD‐XRF) and inductively coupled plasma‐atomic emission spectrometry (ICP‐AES). The relative standard deviations (RSD) of results on mass fraction measurements by WD‐XRF were < 1.0% m/m for eighteen components. F‐tests showed that all five samples were homogeneous. Nineteen laboratories contributed with measurement results (2127 in total) for the certification of mass fractions for twenty‐three elements and compounds. Twenty‐three components in the nickel ores and twenty components in the nickel concentrates were characterised as certified values, while the Ni mass fractions ranges from 0.1 to 9.02% m/m in these certified reference materials. These five samples were approved as national certified reference materials by the National Organisation of Reference Materials of China in 2012.  相似文献   

相山居隆庵21号带铀矿床水文地质条件及矿坑涌水量估算     

谢国发  吴志坚  傅光华  邓标荣  马英英 《铀矿地质》2015,(1)

居隆庵菱形断块是相山地区重要铀资源基地,21号带地处居隆庵菱形断块的西部,水文地质条件属简单-中等类型,相对其它矿床更为复杂。笔者采用狭长水平坑道法和水文地质比拟法对该矿床进行矿坑涌水量估算,其钻孔单位涌水量0.1L·(s-1·m-1),预测矿坑涌水量29m3·h-1。研究显示,矿床主要含水带(构造及裂隙)富水性弱且不均,导通性不强;而地下水补给条件好,水压高。在矿床开采过程中应加强监测,及时判断可能出现的涌水量变化情况,保证生产安全。  相似文献   

渤南洼陷北部陡坡带沙四上亚段成岩演化及其对储层物性的影响     

马奔奔  操应长  王艳忠  贾艳聪  张少敏 《沉积学报》2015,33(1):170-182

综合利用岩芯观察、岩石铸体薄片、流体包裹体、岩芯实测物性并结合埋藏史分析,对渤南洼陷北部陡坡带沙四上亚段砂砾岩储层的成岩演化和物性演化特征进行了研究.结果表明:储层经历了强烈压实、碳酸盐灰泥重结晶、多期胶结和溶解以及复杂交代等成岩演化过程.结合成岩环境演化特征,认为储层经历了多期酸碱交替的流体演化,在同一成岩环境演化背景下,由于近岸水下扇不同亚(微)相沉积特征差异性,控制了不同亚(微)相成岩演化特征的差异性,并决定了其物性演化的差异性.采用反演回剥的方法对地史时期近岸水下扇砂砾岩储层的物性进行了恢复,可知对储层物性演化起到重要影响的有压实作用、碳酸盐胶结、碳酸盐灰泥重结晶作用、酸性溶解及油气充注,并建立了近岸水下扇不同亚(微)相储层物性演化模式:扇根砾岩在埋藏过程中成岩作用以压实作用和灰泥杂基重结晶作用为主,溶解作用微弱,物性持续降低,在中深层灰泥杂基的重结晶作用使扇根砾岩物性快速降低,现今物性极差,主要发育干层.扇中辫状水道距泥岩层较远的储层,由于两期酸性溶解对储层的改造以及油气充注对胶结作用的抑制,中深层仍发育大量原生孔隙和次生孔隙,储层物性较好,可作为良好的油气储集层.扇中辫状水道距泥岩层较近的储层、扇中水道间和扇缘储层成岩作用以强烈胶结作用和交代作用为主要特征,现今物性差,主要发育干层.  相似文献   

开化黄山矿区钻孔偏斜规律研究及控制措施          下载免费PDF全文

赵国法  吕新前 《探矿工程》2015,42(2):48-52

在深部矿产资源勘查中,孔深＞500 m的钻孔越来越多,钻孔偏斜问题日显突出。根据浙江省开化黄山矿区萤石矿勘查钻孔测斜数据,对钻孔偏斜的原因从地质条件和施工工艺等方面进行了分析。认为钻孔偏斜有一定的规律可循：斜孔钻进特殊的车轮效应是引起钻孔方位向钻头自转方向偏斜的基本原因;特殊的地质构造和不当的施工工艺是造成钻孔偏斜异常出现的重要因素。因此,预防钻孔偏斜的措施必须从地质设计和钻探施工工艺2方面着手。  相似文献   

银额盆地石炭-二叠系包裹体成分特征对油气运移的讨论     

韩伟  任战利  卢进才  魏建设  张云鹏 《吉林大学学报(地球科学版)》2015,(5):1342-1351

包裹体成分特征反映了油气的演化程度和运移期次。本文对银额盆地石炭-二叠系4组地层砂岩中的包裹体开展研究,发现研究区包裹体多≤5μm,呈串珠状分布于石英颗粒裂隙中,以气液两相的状态存在。根据包裹体中甲烷等有机组分的含量及其相互关系对研究区油气运移过程展开研究,认为二叠系至少经历过较高温较高盐度、较低温低盐度等两期油气运移;结合烃源岩热演化史研究,可分别对应二叠纪中期-二叠纪末和白垩纪早-晚期两期油气运移过程。  相似文献   

基于多源数据的县域主导功能类型划分及其空间结构模式识别     

陈子龙  王芳  李少英  冯艳芬  陈建国 《地球信息科学学报》2021,23(12):2215-2231

研究县域主导功能类型并分析空间结构模式对区域全面、协调、可持续发展的引导和规划调控具有重要意义。本文以广东省为例,利用K-means聚类分析对其124个县域单位主导功能区类型进行划分;基于腾讯位置大数据,利用位序—规模法则构建空间结构指数,并结合遥感数据对不同主导功能县域的空间结构模式进行识别和分析。研究表明：① 利用统计、遥感、社交媒体以及夜间灯光等多源数据和K-means聚类方法进行县域主导功能区分类,分类结果能客观反映区域特征,广东省县域主导功能可分为生态主导型、农业主导型、工业主导型、中心服务型和均衡发展型5类;② 基于腾讯位置大数据的位序—规模法则方法能够突破城市尺度,结合遥感数据定量分析,可用于中观县域尺度的空间结构模式识别研究;③ 农业主导型和生态主导型县域空间结构指数均值都大于1,呈单中心空间结构特征趋势;工业主导型县域空间结构指数均值小于1,呈多中心空间结构特征趋势;均衡发展型县域空间结构指数均值接近1,不同地区均衡发展型县域所呈现的空间结构特征存在差异;④ 不同主导功能县域之间的空间结构模式差异明显,生态主导型县域多呈单中心极核式,农业主导型县域多呈单中心极核+散点式,均衡发展型县域多种模式并存特征明显,而工业主导型县域呈多中心网络分布模式。  相似文献   

岩石力学实验在地应力测试中的应用          下载免费PDF全文

牛志力  孟燕  郑元忠  马晓东  周长祥  舒磊 《山东国土资源》2021,37(6)

介绍了应力解除法的基本原理、测试步骤及计算过程,采用实验室测得的弹性模量、泊松比及现场应力解除获得的三维膨胀变形数据,由线性虎克定律即可计算出应力解除前岩体中应力的大小和方向。以济宁煤田安居煤矿为例,获得3个测点的最大主应力、中间主应力及最小主应力的大小、方向、倾角,总结了安居煤矿井底车场附近的原岩应力分布规律。  相似文献   

近20年屯堡聚落聚集区乡村聚落规模演变——以安顺市西秀区为例     

陈珍琴  赵翠薇  祖海琴  陆清平  潘秋竹 《热带地理》2023,43(1):168-177

以西秀区2000、2010和2020年乡村聚落斑块为基础数据,运用乡村位序-规模法则、聚落规模等级模型等方法,分析西秀区乡村聚落等级规模分布特征及演变规律,并分析屯堡聚落在该过程的发展变化。结果显示：1）乡村聚落总规模、聚落数量总体上呈增长趋势,3个时段屯堡聚落面积占乡村聚落总面积的比例超过20%;2）西秀区乡村聚落规模分布符合乡村位序-规模法则,拟合优度在0.90以上,负指数分布特征突出,并表现出“首位聚落”和“垂尾”分布特征,2000—2010年乡村聚落规模趋于集中分布,2010—2020年趋于均衡;3）不同等级乡村聚落空间分布位置相对稳定,数量上呈低等级向高等级演变;4）屯堡聚落规模稳定增长,是高位序、高规模等级聚落的重要组成部分,但少部分屯堡聚落位序出现倒退现象。未来应科学规划乡村聚落用地布局,形成合理的乡村聚落等级规模结构,保护屯堡文化,打造区域特色聚落。  相似文献   

Resilience of traditional knowledge systems: The case of agricultural knowledge in home gardens of the Iberian Peninsula     

《Global Environmental Change》2014

The resilience of a social–ecological system largely depends on its capacity to learn by absorbing new information to cope with change. But, how resilient are traditional knowledge systems? We explore the resilience of the traditional agricultural knowledge system of home gardeners in the Iberian Peninsula (n = 383). We use multivariate analysis to explore the co-existence of agricultural information derived from two different knowledge systems: (i) knowledge and use of landraces (representative of traditional agricultural knowledge) and (ii) knowledge and use of commercial crop varieties (representative of modern agricultural knowledge). Our analyses show a positive association between both types of knowledge: overall gardeners who are more knowledgeable about commercial crop varieties are also more knowledgeable about landraces. Despite this overall tendency, results from hierarchical cluster analysis showed different groups of traditional and modern knowledge holders. Our results suggest that (a) traditional knowledge is not a frozen and static corpus of knowledge and (b) modern and traditional agricultural knowledge are not necessarily mutually exclusive. Both maintenance of some aspects of the traditional knowledge and incorporation of some aspect of the modern knowledge seem to be core elements of home gardeners’ body of agricultural knowledge which is constantly evolving in response to changing environmental and socioeconomic conditions. Changes in traditional knowledge can be seen as a part of the general self-organizing process of this knowledge system.  相似文献   

基于规则的多种类型海岸线TM/ETM+影像智能检测方法     

WANG Changying  ZHANG Jie  SONG Pingjian 《海洋学报(英文版)》2014,33(7):89-96

A coastline is defined as the average spring tide line. Different types of seacoast, such as sandy, silty, and bio- logical coast, have different indicators of interpretation. It is very difficult to develop a universal method for interpreting all shorelines. Therefore, the sandy, the silty, and the biological coast are regarded as research objects, and with data mining technolog,found the rules of interpretation of those three types of coastlines. Then, an intelligent coastline interpretation method based on rules was proposed. Firstly, the rules for ex- tracting the waterline in Landsat TM/ETM＋ （Thematic Mapper/Enhanced Thematic Mapper Plus） imagery were discovered. Then, through analyzing the features of sandy, silty and biological coast, the indicators of interpreting different types of shoreline were determined. According to the indicators, the waterline could be corrected to the real coastline. In order to verify the validity of the proposed algorithms, three Landsat TM/ETM＋ imageries were selected for case studies. The experimental results showed that the proposed methods could interpret the coastlines of sandy; silty, and biological coasts with high precision and without human intervention, which exceeded three pixels.  相似文献