共查询到20条相似文献，搜索用时 46 毫秒
1.
王自杰 《华东地质学院学报》1997,20(2):105-111
本文介绍了三对象的多维标度法，计算方案是通过一维标度求法和多维标度法把原始问题降至为标准特征值－特征向量问题来解决。该方法的主要目的是提取更多信息，简化数据结构，并重新标度研究对象于新的低维空间，以便能通过二维“因子轴”来直接检验，它适合于定性和定量数据，编写计算程序进行标度分析，在内蒙古赤峰某金矿进行矿产了预测，应用效果良好。 相似文献
2.
Torgerson方法在某斑岩铜钼矿蚀变与矿化分析中的应用 总被引：2，自引：0，他引：2
Torgerson方法是一种多维标度法。用于研究变量或样本对象，它从一组对象的两两之间的相似性度量或非相似性度量出发，求出这组对象在某低维空间中的标度，从而发现这组对象的整体关系。通过它在某斑岩铜钼矿的蚀变与矿化分析的实例应用，说明该方法在矿产资源评价方面具有一定的实效性。 相似文献
3.
Kruskal法就是将N个多维(P维)对象点,在近似的意义下,从P维约简到一个较低维数的空间内,寻求一个最佳的空间维数和空间标度,而近似地保存各对象点数据的原始关系。这种方法通常称为多维标度法。 相似文献
4.
多维标度法在矿产预测中的应用 总被引：1，自引：0，他引：1
在矿产预测中常涉及一些定性变量,对这些变量的分析和应用,必须将定性描述的地质特征转化为用数值表示的变量,这就需要处理此问题的方法——多维标度法。笔者介绍了计量性的Ｔｏｒｇｅｒｓｏｎ法、准计量性的林知已夫数量化理论和非计量性多维标度法,并列举了其在矿产预测中的应用实例。 相似文献
5.
在矿产预测中常涉及一些定性变量,泽这些变量的分析和应用,必须将定性描述的地质特性转化为用数值表示的变量,这就需要处理此问题的方法－－多维标度法。笔者介绍了计量性的Ｔｏｒｇｅｒｓｏｎ法、准计量性的林知已夫数量化理论和非计量性多维标度法,并列举了其在矿产预测中的应用实例。 相似文献
6.
资源环境科学多维信息平台研究 总被引：4，自引：1，他引：4
资源环境信息（地理信息）具有时空特点，其种类复杂、获取渠道多样、具有多种比例尺和分辨率以及不同的表达方式，因此，资源环境信息是多维的。遥感（RS）、地理信息系统（GIS）、全球定位系统（GPS）和数据库（DB）等现代信息技术为资源环境科学的发展起了巨大的推动作用，是资源环境科学由以定性描述为主走向定性、定量、定位综合研究的技术基础。然而，面对多维的资源环境信息，要构建一个具有多维信息表达方式、人机和谐、交互性和参与感强、满足资源环境科学研究人员需要的多维信息处理平台，仅靠这些技术是不够的。作为现代信息技术发展的重要分支，虚拟现实（VR）技术适应了这一形势发展的需要，它已经在许多领域得到广泛的应用。在描述资源环境科学多维信息特点的基础上，重点探讨了如何利用虚拟现实技术及其它信息技术构建满足研究人员需要的资源环境科学研究多维信息平台、它的功能以及实施方式。 相似文献
7.
洪恒令 《吉林大学学报(地球科学版)》1985,(3)
聚类问题 客观对象是由它们的本质属性来确定的,也由它们的属性的异同来进行区分和归类。每一个个别属性可以用一维实数空间来表现,多个属性可用多维实数空间来表现。这样,一个对象就被看作高维空间中的一个点(或向量)。所谓聚类问题就是 相似文献
8.
通过地震活动性特征研究了华北与东南沿海地区岩石介质差异性，以唐山、海域及福建地区为例，计算了上述地区的视应力降和环境应力背景值，并用分形理论中的标度揭示了这种差异性的定量特征。结果表明，在华北地区（唐山与海城），环境应力值有强烈的涨落，而东南沿海地区（福建）其涨落并不明显，从而揭示了华北与东南沿海地区地壳岩石介质的差异性。这意味着上述地区的动力学特征在板块构造力作用下存在明显的差异。最后，应用动力学观点讨论了上述变化的复杂性和可能存在的问题。 相似文献
9.
有序属性类最小维数分析(MDA—OR),是日本学者林知乙夫等人近年来提出的一种多维标度方法。本文对该法在伟晶岩稀有金属元素矿床(点)的评价上,作了初步尝试,并取得了较为令人满意的结果。 相似文献
10.
多维分形克里格方法 总被引：9，自引：0，他引：9
时间序列与空间场信号往往是非规则分布的，经常需要将非规则分布的时空信号插值为规则分布的信号或估计某些未知点的值。如油气田、煤田以及金属矿山储量估算，工程地质参数估计，病虫害区域分布调查等都要求根据少量不规则数据点进行插值估算。估值方法中应用最为广泛的地质统计学方法（或(Krige)克里格方法）是一种低通滤波器，无法重建原始信号中的高频、局部与弱信号。开发的多维分形克里格方法可以将不规则分布的时间—空间（时空）信号插值为规则分布的信号；可以提取时空信号中高频、局部与弱信号，估计过程参数可以作为特征参数用于模式识别。利用褶积滤波理论定量导出了地质统计学的低通滤波特性，它在插值过程中丢失了高频、局部和弱信号。在定义了时空信号的度量尺度与测度后，实现了多维分形插值，多维分形插值保留了系统中更多的高频信息。将克里格方法与多维分形方法有机的结合起来产生了多维分形克里格方法，它具有克里格方法和多维分形插值的共同优点。用大洋钻探(ODP)184航次1143A孔的岩芯密度分析进行了插值试验，对比了插值结果及其功率谱。多维分形克里格插值比克里格插值、多维分形插值更为接近已知点值并保留更多的高频信息。还定量分析、对比了影响多维分形克里格插值的因素、厘清了估值问题中固有的测不准关系。
另外，多维分形克里格插值过程得到的局部奇异性、相关性和回归方差能有效地刻划高频、局部与弱信号。这样，多维分形克里格插值过程可以用于提取（非规则或规则网格）时空信号中的局部、高频与弱信号，用于信息提取、模式识别、找矿预测与信号增强等领域。 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
13.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
14.
Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
15.
正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
16.
正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
17.
正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
18.
正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
19.
正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
20.
正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献