SPOT立体图像的有限元最小二乘匹配     

肖建忠 《测绘学院学报》1989,(1)

本文将多点最小二乘匹配算法扩展为有限元最小二乘匹配,导出了有限元最小二乘匹配的数学模型,并提出了自动产生视差格网的方案;通过试验研究了有限元最小二乘匹配中有关参数,例如,辐射变换参数、虚拟观测的权值以及视差格网间隔的确定。有限元最小二乘匹配算法无需预先进行核线重排列,就可以直接答解出有限个格网点的上下视差和左右视差。这种算法亦可用于其他任何投影方式成象的立体图象的自动匹配。  相似文献   

Chemical Characterization and Source Apportionment of Atmospheric Particles Across Multiple Sampling Locations in Faisalabad,Pakistan   总被引：1，自引：0，他引：1       下载免费PDF全文

Wasim Javed  Anthony S. Wexler  Ghulam Murtaza  Muhammad Mazhar Iqbal  Yongjing Zhao  Tayyaba Naz 《洁净——土壤、空气、水》2016,44(7):753-765

  相似文献   

粤北凡口超大型铅锌矿床化流体喷溢中心的确定   总被引：1，自引：0，他引：1  

邓军  杨立强 《岩石学报》2000,16(4):528-530

凡口铅锌矿床是发育于上古生界碳酸直岩建造中的海底热泉喷溢矿床,在研究矿地质的基础上,使用矿物包裹体测温方法,研究矿体温度场的分布,配合矿化元素的分布状态和矿石组构分带特征,推断成矿流体的喷口位置和运移方向。  相似文献   

辉锑矿中稀土及多元素地球化学特征   总被引：3，自引：0，他引：3  

张国林 《矿产与地质》1999,13(1):13-19

锑矿床和微细浸染型金矿床中辉锑矿的稀土元素地球化学指标对比分析,表明锑矿床中辉锑矿稀土元素含量低于金矿床中含金辉锑矿。锑矿床中辉锑矿的ＬＲＥＥ／ＨＲＥＥ小于金矿中含金辉锑矿。从辉锑矿的多元素地球化学特征的分析,认为金矿床中辉锑矿主元素锑含量较低,富含金、银、砷杂质元素,而锑矿床中辉锑矿的锑含量较高,金、银、砷含量较低。利用辉锑矿稀土元素及杂质元素地球化学特征,可间接或直接评价微细浸染型金矿床。  相似文献   

Experimental study of high to intermediate temperature alteration in porphyry copper systems and geological implications     

Jianping LI  Huayong CHEN  Long SU  Bing XIAO  Yunfeng WANG 《中国科学:地球科学(英文版)》2019,(3):550-570

Porphyry copper systems, which provide most of the world's copper resource, are commonly associated with characteristic concentric zonation of alteration and mineralization. In-depth knowledge of the distribution and transport mechanism of elements in the alteration zones is essential for understanding the ore-forming processes. We employed flow-reaction apparatus to simulate the fluid-rock interactions during porphyry ore formation so as to investigate the mechanisms that govern the transport of elements and the development of zonation. The results indicate more heterogeneous distribution of elements in the experimental products at 450°C compared to those at lower temperatures, which implies a crucial role of temperature in controlling elements redistribution in hydrothermal systems. Heating advances potassic alteration and Ca leaching of wall rocks.To achieve the same degree of sodic alteration, it requires a higher concentration of Na+in the fluid toward higher temperature.Temperature also facilitates the incorporation of Ti, Sr and Pb into silicate minerals through cation substitution. We infer from experimental results that from the center of intermediate to mafic volcanic wall rocks toward periphery, the contents of K and Ti should decrease and the contents of Ca, Zn and Mn should increase, whereas the trend for Si and Na could be non-monotonic.This study provides experimental and theoretical insights into a variety of vital geological observations, including anhydrite formation and the widespread development of potassic rather than sodic alteration in porphyry copper deposits.  相似文献   

Bertrand's Law and Weinberg's Principle and Their Extension     

Cao Yuqing  Hu Kuanrong 《世界地质(英文版)》2000,3(2)

Bertrand's law that the plant can't live in lack of some indispensable element, appropriate amount of the element will make the plant thrive but excessive amount of it will make the plant poisoning and even die was obtained through the study on the biologic adaptability in laboratory for the indispensable element manganese by G. Bertrand. E. D. Weinberg developed Bertrand's law as that certain amount of manganese was appropriate for the growth of some bacteria but not for the form of bacteriophage.The double threshold contents of elements indispensable for the organisms and their physiological effects can be extended to different hydrogeochemical zones of hydrogeological unit. Some elements are lack in the hydrogeochemical zone, in which the elements leaching and transfer are very strong the biological physiological effect is negative to the elements content. However, in the elements enrichment area caused by leaching and concentrating by evaporation or environmental pollution, the biological physiological effects are positive to the element content. The elements content in other areas which are in between two above types is appropriate for the organisms.From the hydrogeochemical study in Liliu , Shanxi province we obtained that the rate of KBD, IDD and dental caries are resulted from deficiency of elements Se, I and F in water (soil), respectively, the rate of diseases above is inversely related with the element content, while in the zone with excessive fluorine caused by enrichment and leaching, the rate of endemic fluorosis is positive to the fluorine content.  相似文献   

The Chemistry of Niobium Mineralisation at Bayan Obo, Inner Mongolia, China: Constraints on the Hydrothermal Precipitation and Alteration of Nb-Minerals   总被引：1，自引：0，他引：1  

Martin SMITH  John SPRATT 《地质学报》2012,86(5):700-722

As well as world class Fe and REE resources the Bayan Obo mineral deposits also hosts significant niobium resources(estimated as 2.2 Mt Nb with an average grade of 0.13 wt% Nb).Niobium in this study is primarily hosted in aeschynite-(Ce) and(Nd),but with subsidiary amounts of pyrochlore,fergusonite-(Ce),fersmite and columbite.Here we report on the paragenetic and textural setting of aeschynite,pyrochlore and fergusonite in the main ore bodies and in a carbonatite dyke.Niobium in a carbonatite sample is hosted in a phase tentatively(due to significant Ca,Mn and Ti contents) identified as fergusonite-(Ce).Aeschynite occurs overgrowing foliation in banded ores,in fractures and vugs in aegirine-rich rocks and in calcite veins.The composition in all settings is similar,but some examples in banded ores develop significant zonation in Y,Th and the REE,inferred to relate to buffering of halogen acid species to low levels by dissolution and fluoritisation of calcite,and the preferential precipitation of LREE from solution due to lower mineral solubility products compared to the HREE.Although lower in total concentration the ratios of REE in pyrochlore are similar to those of aeschynite and suggest the same metal source.The crystallisation of pyrochlore probably relates to growth in paragenetic settings where carbonates had already been eliminated and hence the buffering of F-species activities in the hydrothermal fluid was reduced.Both aeschynite and pyrochlore show evidence of alteration.Primary alteration of aeschynite resulted in leaching of A-site cations(Ca,REE,Th) and Nb,addition of Fe,and ultimately replacement by Ba-Ti phases(baotite and bafertisite).Secondary,metamictisation enhanced,possibly supergene alteration of pyrochlore resulted in hydration,leaching of A-site cations leading to the development of lattice vacancies and increases in Si.The presence of hydrothermal Nb resources at Bayan Obo suggests there may be potential for further Nb discoveries in the area,whilst the trends in element mobility during alteration have significant implications for the utility of A-B oxides as components of materials for immobilisation of radionuclides.  相似文献   

普洱二台坡超大型化探异常找矿前景     

谢岿锐  李开全  余乔富 《云南地质》2008,27(4):469-476

测区共分析15个元素,除Au外,其余14个元素都产生异常。对异常作因子分析、R型聚类分析,结合物探、遥感、地质、1：20万区域化探资料综合研究,提出了在此异常区寻找大型矿床的可能性。  相似文献   

Presentation of RISK-UE Project     

Pierre Mouroux  Benoît Le Brun 《Bulletin of Earthquake Engineering》2006,4(4):323-339

This paper is a presentation of an European project called RISK-UE, entitled: “An advanced approach to earthquake risk scenarios with applications to different European towns”. It gives the origin, the objectives and the organisation of the project, together with the content of the different workpackages comprising methodological aspects: different features of European town, seismic hazard, urban system exposure, vulnerability of current, historical and monumental buildings, vulnerability of lifelines and essential facilities, seismic risk scenario, with an application to the seven following cities: Barcelona, Bitola, Bucharest, Catania, Nice, Sofia and Thessaloniki. These studies were realized in close relation with the decisionmakers of these cities, in order that they implement Risk Management Plans and Plans of Action to effectively reduce seismic risk.  相似文献   

滤光片对航摄仪内方位元素、畸变差的影响     

蒋文松 《测绘学院学报》1991,(1)

本文论述了滤光片的不平整度和光谱透射特性对航摄仪内方位元素、畸变差的影响,并对航摄仪不戴滤光片与戴滤光片做了对照检定实验,理论分析及实验结果都表明:滤光片对内方位元素、畸变差有较大影响,尤其对色像差较大的航摄仪,其影响更大。文章建议,航摄仪在检定时应加戴航摄时使用的滤光片。  相似文献