应用高分辨率透射电镜研究煤显微组分的结构   总被引：4，自引：0，他引：4       下载免费PDF全文

赵峰华  任德贻 《地质论评》1995,41(6):564-570

应用高分辨率透射电镜研究变质系列镜质体和丝质体以及热解碳的物理结构特征表明,随煤级增高,镜质体的基本结构单元(BSU)的平均长度及缩聚芳香层平均环数NC呈增加的趋势;衍射环数增多,环的弥散程度减小,最终出现弧状;表明镜质体的BSU在变质过程中长大,定向性增强,VRo,max=6.50％是阶跃点,当VRo,max>6.50％,BSU突然定向排列。获得了很难获得的低煤化烟煤(VRo,max=0.66％)的高分辨图像,它的BSU尺寸小,无序排列。对丝质体和热解碳高分辨图像的首次研究发现,前者有序性差,随煤级演化的速度较镜质体慢,后者有序性好。  相似文献   

DETERMINATION OF A MULTIVARIATE DETECTION LIMIT AND LOCAL CHEMICAL RANK BY DESIGNING A NON-PARAMETRIC TEST FROM THE ZERO-COMPONENT REGIONS     

YI-ZENG LIANG  OLAV M. KVALHEIM  Department of Chemistry  University of Bergen  N- Bergen  NorwayAGNAR HOSKULDSSON  Danish Engineering Academy  DK- Lyngby  Denmark 《地理学报(英文版)》1993,(4)

In this paper we redefine the term detection limit to embrace the inherent multivariate nature of samples,instrumental measurements and chemometrics resolution procedures. The so-called zero-componentregions, i.e. parts with no chemical components eluting, are used as repeated analytical blanks to estimatea statistical multivariate detection limit for determining the number of chemical species in local regionsof a single two-way chromatogram or a collection of synchronized one-way chromatograms. For two-waychromatography the detection limit is determined from the distribution of the first eigenvalues obtainedfrom all possible combinations of spectra in the zero-component regions. The number of spectra in eachcalculation should correspond to the number included in the later examination of the local retention timeregions. For one-way chromatography on a collection of samples with similar chemical components atvarying concentrations the same procedure is used, with the samples taking the role of the spectra intwo-way chromatography. The detection limit can be chosen at various confidence levels depending onwhether false positive or negative detection of minor components is most critical. The results obtainedfrom the zero-eigenvalue distribution are more robust than those obtained by a previously developedF-test.  相似文献   

注水井与采油井间的关联分析   总被引：1，自引：0，他引：1  

刘林 《矿物岩石》1998,(Z1)

本文引进了两种进行注水井和采油井关联分析的方法—灰色系统分析法和秩相关分析法。灰色系统分析法采用灰色系统理论中的关联系统理论中的关联分析理论,秩相关分析法采用Ｓｐｅａｒｍａｎ秩相关系数和秩差平方和,用ｔ－检验来度量其显著性。  相似文献   

“9.16”前后的断层水平形变     

刘丰 《福建地震》1998,(1)

本文将前楼,朱坑的小三角观测资料通过亏自由网平差方法加以处理,用三倍误差椭圆曲线作为判定异常的基本依据。“9.16”地震前一年以内,断层的水平形变很好地呈现出了前兆异常信息,地震的发生与断层的水平形变表现两者之间有着极其紧密的联系。  相似文献   

湖南利民煤矿煤与瓦斯突出量级程度划分及其应用研究     

曹运江  黄润秋  冯涛  汪禄生  刘新华 《地球科学进展》2004,(Z1)

根据煤与瓦斯突出的地质条件,对煤岩体系中的弹性潜能、瓦斯内能、采场附加应力积聚的能量分别进行了定性的划分,并结合弹性潜能、瓦斯内能,对煤与瓦斯突出的量级程度也尝试性地首次做出分类,并提高了原来的下限指标。对典型突出模式进行了简要地分析,为今后开展防治利民矿井煤与瓦斯突出工作提供了新的思路与对策。  相似文献   

大别山北麓高煤级煤的变形——变质类型   总被引：3，自引：0，他引：3       下载免费PDF全文

曹代勇  张守仁 《地质科学》2003,38(4):470-477

对中国东部大别造山带前陆盆地石炭纪含煤岩系的高煤级煤进行了深入研究,划分出3种变形——变质类型。构造——热变质类型煤样采自剪切应变带内,煤镜质组反射率各向异性显著,煤结构参数L_c最大,L_a/L_c和d₀₀₂最小,TEM下存在局部石墨化现象,呈现动力变质特征。岩浆热变质类型煤样受中生代花岗岩侵入体异常高温影响,Ro_max和Ro_bi较大,显微镜下呈非均质结构,L_a/L_c在3类煤中最大。区域变质类型煤的Ro_max最小,但仍远远高于稳定地区相近地质时代煤,反映了造山带旁侧构造——热活动背景下有机质的高演化程度。  相似文献   

NPID环上三矩阵乘积的Moore-Penrose逆的顺序律     

林冠军  张锦川 《华东地质学院学报》2003,26(2):139-141

利用非交换主理想整环R上矩阵与R所嵌入的商除环K上矩阵的秩之间的关系，以矩阵秩的表达式给出三矩阵乘积的Moore—Penrose逆的顺序律(ABC)^ =A^ B^ C^ 成立的若干个充要条件，此处A，B，C是R上的矩阵，M^ 表示矩阵M的Moore-Penrose逆。  相似文献   

恩洪矿区煤层气富集的控制因素     

易同生 《矿物学报》2007,27(3):493-498

恩洪矿区是云南省重要产煤基地，晚古生界的上二叠统宣威组是主要含煤岩系，其煤层镜质组含量较高，变质程度中等，蕴藏着丰富的煤层气资源。综合研究表明：该区煤层气富集的控制因素主要为煤层厚度、煤岩组分、煤级、吸附性能和良好的保存条件。  相似文献   

Exposure of global mountain systems to climate warming during the 21st Century   总被引：3，自引：0，他引：3  

D. Nogus-Bravo  M.B. Araújo  M.P. Errea  J.P. Martínez-Rica 《Global Environmental Change》2007,17(3-4):420-428

We provide an assessment of surface temperature changes in mountainous areas of the world using a set of climate projections at a 0.5° resolution for two 30-year periods (2040–2069 and 2070–2099), using four Intergovernmental Panel for Climate Change (IPCC) emission scenarios and five AOGCM. Projected average temperature changes varied between +3.2 °C (+0.4 °C/per decade) and +2.1 °C (+0.26 °C/per decade) for 2055 and +5.3 °C (+0.48 °C/per decade) and +2.8 °C for 2085 (+0.25 °C/per decade). The temperature is expected to rise by a greater amount in higher northern latitude mountains than in mountains located in temperate and tropical zones. The rate of warming in mountain systems is projected to be two to three times higher than that recorded during the 20th century. The tendency for a greater projected warming in northern latitude mountain systems is consistent across scenarios and is in agreement with observed trends. In light of these projections, warming is considered likely to affect biodiversity (e.g., species extinctions, changes in the composition of assemblages), water resources (e.g., a reduction in the extent of glaciated areas and snow pack), and natural hazards (e.g., floods). Accurate estimate of the effects of climate change in mountain systems is difficult because of uncertainties associated with the climate scenarios and the existence of non-linear feedbacks between impacts.  相似文献   

不同变质类型煤的XRD结构演化特征   总被引：6，自引：0，他引：6  

李小明  曹代勇  张守仁  邢秀云 《煤田地质与勘探》2003,31(3):5-7

通过对大别造山带前陆盆地石炭纪含煤岩系高煤级煤的X射线衍射分析,探讨了高煤级煤基本结构单元的演化特征及其影响因素。结果表明,构造应力作用提高了“煤晶核”BSU的延展度和堆砌度,使面网间距减小。   相似文献