Spatial orthogonality of the principal components computed from coregionalized variables   总被引：6，自引：0，他引：6  

P. Goovaerts 《Mathematical Geology》1993,25(3):281-302

Within the frame of the linear model of coregionalization, this paper sets up equations relating the variogram matrix of the principal components extracted from the variance-covariance matrix to the diagonal variogram matrices of the regionalized factors. The spatial orthogonality of the principal components is investigated in three situations: the intrinsic correlation, two basic structures with independent nugget components, three basic structures with independent nugget components and uncorrelated subsets of variables. Two examples point out that the correlation between the principal components may be nonnegligible at short distances, especially if the correlation structure changes according to the spatial scale considered. For one of the two case studies, an orthogonal varimax rotation of the first principal components is found to greatly reduce the spatial correlation between some of them.  相似文献   

投影矩阵     

矫希国 《吉林大学学报(地球科学版)》1988,(1)

本文主要根据线性方程组的理论给出了求解投影矩阵的方法,再根据投影矩阵与广义逆矩阵之间的关系,进一步又给出了一类广义逆矩阵的求解方法,即满足Penvose’s第一条与第三条广义逆矩阵的一般表达式。  相似文献   

新疆玛纳斯河冲洪积扇地区地下水资源管理模型     

张石峰  潘孔钊  郭军 《新疆地质》1990,(4)

为了建立新疆玛纳斯河冲洪积扇地区的地下水资源管理模型,首先恰当地建立了适合于该区水文地质条件的地下水流动有限元数值模拟模型系统,并对地下水模拟系统进行了一系列线性化处理,以适应管理方法的要求.然后采用“响应矩阵法”将数值模型和线性规划方法结合,建立了平稳流与非平稳流两类管理模型,对该区整个含水层各分布点的各种水力状态进行全面管理.最后得到一系列满足该区发展目标的决策方案.  相似文献   

龙门山及其邻区的构造和地震活动及动力学   总被引：156，自引：37，他引：156       下载免费PDF全文

邓起东  陈社发 《地震地质》1994,16(4):389-403

论述了龙门山推覆构造带、岷山隆起、成都平原和龙泉山地区的构造和地震活动，讨论了构造活动特点和演化历史，并分析了它们的形成机制和动力学问题  相似文献   

利用矩阵光学方法分析单光栅自成像现象     

余飞鸿  梁荫中 《武汉大学学报(信息科学版)》1994,(2)

本文首次用矩阵光学理论，结合光栅衍射相于条件，推导出光栅自成像条件，用像的位移叠加观点解释了光栅自成像现象，并分别讨论在球面单色波和平面单色波照明下自成像的特点。  相似文献   

实际体系矿物共生关系的矩阵代数投影分析──以河南杨乃沟泥质片岩为例   总被引：1，自引：0，他引：1  

李心清  殷辉安  闻辂 《矿物学报》1994,(3)

本文以河南省西峡县杨乃沟泥质片岩为研究对象，在矿物学工作的基础上，把Greenwood矩阵代数投影分析方法成功地运用到了实际的矿物共生分析中，讨论了杨乃沟泥质片岩的矿物共生关系和某些组分对共生关系的影响，更进一步地揭示了该方法的潜在意义和优越性，同时表明：矩阵代数投影分析方法不仅适用于具理想组分的体系，而且也适用于实际的矿物岩石体系。  相似文献   

Kerogen-mineral reactions at raised temperatures in the presence of water     

T.I. Eglinton  S.J. Rowland  C.D. Curtis  A.G. Douglas 《Organic Geochemistry》1986,10(4-6)

Kerogen has been artificially matured under “hydrous pyrolysis” conditions in the presence of various minerals in order to investigate the influence of the latter on the organic products. In addition to three clay minerals (montmorillonite, illite, kaolinite), calcium carbonate and limonite were also employed as inorganic substrates. Kerogen (Type II) isolated from the Kimmeridge Blackstone band was heated in the presence of water and a 20-fold excess of mineral phase at two different temperatures (280 and 330°C) for 72 hr. Control experiments were also carried out using kerogen and water only and kerogen under anhydrous conditions. This preliminary study describes the bulk composition of the pyrolysates with detailed analyses of the aliphatic hydrocarbon distributions being provided by gas chromatography and combined gas chromatography-mass spectrometry.In the 280°C experiments, considerably more organic-soluble pyrolysate (15% by weight of original kerogen) was produced when calcium carbonate was the inorganic phase. At 330°C, all samples generated much greater amounts of organic-soluble products with calcium carbonate again producing a large yield (40% wt/wt). Biomarker epimerisation reactions have also proceeded further in the 330°C pyrolysate formed in the presence of calcium carbonate than with other inorganic phases. Implications of these and other observations are discussed.  相似文献   

一种有效的基于灰度共生矩阵的图像检索方法   总被引：11，自引：0，他引：11  

王波  姚宏宇  李弼程 《武汉大学学报(信息科学版)》2006,31(9):761-764

提出了一种基于广义图像灰度共生矩阵的图像检索方法。该方法首先将原图像作平滑处理得到平滑图像，然后将原图像和平滑图像组合得到广义图像灰度共生矩阵，提取该矩阵的统计特征量，最后将该统计量组成归一化向量用以检索。实验结果表明，本方法的效果要优于单纯的灰度共生矩阵法。  相似文献   

Contextualising gender empowerment at the grassroots: a tale of two policy initiatives     

Saraswati Raju 《GeoJournal》2006,65(4):287-300

The policy environment on gender is fraught with contradictions and contestation of varying degrees in India that does not disappear even as recent transformative mode of participatory initiatives seem to place women’s agency at the core of empowerment agenda. Drawing from two collaborative projects at the grassroots, the paper argues that even well conceptualised projects miss the cutting edge distinction between women and gender and continue to engage with an instrumental logic of women’s development and empowerment at the expense of issues of gender equality and equity in translating the intention into action. It is also observed, however, that spatially embedded social and cultural specificities impact policy discourse resulting in very different outcomes of conceptually comparable policy formulations. According to the author acknowledging spatiality of experiences provides a vantage point to critically engage with context-specific strategies to resolve gendered conflicts and tensions resulting from confining social relations and normative gender codes.  相似文献   

Postcolonial environmental justice: Government and governance in India   总被引：1，自引：0，他引：1  

Glyn Williams  Emma Mawdsley 《Geoforum》2006,37(5):660-670

In this paper, we investigate the context within which struggles for environmental justice are taking place in India. We explore the ways in which postcolonial patterns of government and governance in India affect the ends, the means and the representation of these struggles, focusing on three particular areas: state reform, the judiciary and public interest litigation, and environmental social movements. We argue that India differs from west in the ambitious yet incomplete and contradictory nature of government-sponsored intervention in the environment, and in the particular nature of its public sphere, both of which have been important in shaping struggles for environmental justice. Our wider intention is not merely to catalogue these differences, but to use the Indian material to raise questions about the emphases and implicit assumptions of western environmental justice literature, and reflect on how these may be need reconsideration when working in postcolonial contexts.  相似文献