On the choice of data transformation for modelling time series of significant wave height     

C. Cunha  C. Guedes Soares 《Ocean Engineering》1999,26(6):185

Autoregressive models have been shown to adequately model the time series of significant wave height. However, since this series exhibits a seasonal component and has a non-gaussian nature, it is necessary to transform the series before a model can be fit to the data. Two different transformations that have been used in earlier work are shown not to be appropriate for all types of applications. A third transformation is proposed here, which combines the better features of the two earlier ones and which is appropriate for simulation work. This is demonstrated with an example of a series from Figueira da Foz, a location of the Portuguese Coast.  相似文献   

“构造附加静水压力”及其应用     

吕古贤  周绍东  文锦明  杨恒书 《四川地质学报》1999,(2)

提出地壳任一点静水压力部分是由重力所附加的静水压力和由构造作用力所附加的静水压力叠合而成的。处在挤压变形带、剪切变形带到引张变形带（及地域）中岩石所承受的构造附加静水压力有逐次变小的规律性。构造叠加致使同一地壳深度的水平面上静水压力值不相等,这种压力梯度是流体及油气长距离水平运移的主要原因。建立岩石矿床形成深度的构造校正测算方法,并提出构造物理化学成矿的新认识。  相似文献   

从原生晕、原生叠加晕到构造叠加晕:化探找盲矿法的发展与创新          下载免费PDF全文

李惠  禹斌  张国义  马久菊  李德亮  孙凤舟  李永才  魏江  赵佳  王俊  王一大  李上  张贺然  魏子鑫 《地质找矿论丛》2016,31(1):92-98

构造叠加晕找盲矿法是在原生晕找盲矿法理论基础上发展的新技术方法。根据热液矿床成矿成晕具多期多阶段叠加特点提出的原生晕叠加理论,将原生晕找盲矿法发展为原生叠加晕找盲矿法;根据热液矿床成矿成晕严格受构造控制而提出的构造叠加晕理论,将原生叠加晕找盲矿法发展为构造叠加晕找盲矿法。文章介绍了从原生晕到原生叠加晕又到构造叠加晕找盲矿法在理论、研究思路、工作方法等方面的发展与创新。  相似文献   

On the roto-translatory motion of a satellite of an oblate primary     

J. M. Ferrándiz  M. E. Sansaturio  R. Caballero 《Celestial Mechanics and Dynamical Astronomy》1993,57(1-2):189-202

We deal with the problem of the motion of a triaxial satellite of an oblate primary of larger mass. We show that the treatment is simplified by using a canonical set of variables previously introduced by the authors, that allows a drastic reduction in the expansions of the potential. A general method to avoid the appearance of virtual singularities when the angles between certain planes are small is designed. Our approach is applicable either to natural or artificial satellites.  相似文献   

广西隆林县隆或金矿的地质特征和成因分析     

张振贤  吴均贵  曾广海 《南方国土资源》1996,(4)

隆林县隆或金矿属微粒型金矿，具有多层位、层状矿体为主、矿石和矿物成分简单、沉积结构构造特征，属典型层控矿床。矿床成因与生物礁的消失、滑塌事件、深水火山碎屑硅泥质上超盆地的叠覆、以及有机质的热解和分异有关。火山作用提供金的来源，火山～碎屑～浊积岩相为矿源层和含矿层，并受沉积盆地的关闭和开启影响，形成成岩矿床、成岩～后生或后生矿床  相似文献   

Synchronization of perturbed non-linear Hamiltonians     

Bruce R. Miller  Vincent T. Coppola 《Celestial Mechanics and Dynamical Astronomy》1993,55(4):331-350

We propose a new method based on Lie transformations for simplifying perturbed Hamiltonians in one degree of freedom. The method is most useful when the unperturbed part has solutions in non-elementary functions. A non-canonical Lie transformation is used to eliminate terms from the perturbation that are not of the same form as those in the main part. The system is thus transformed into a modified version of the principal part. In conjunction with a time transformation, the procedure synchronizes the motions of the perturbed system onto those of the unperturbed part.A specific algorithm is given for systems whose principal part consists of a kinetic energy plus an arbitrary potential which is polynomial in the coordinate; the perturbation applied to the principal part is a polynomial in the coordinate and possibly the momentum.We demonstrate the strategy by applying it in detail to a perturbed Duffing system. Our procedure allow us to avoid treating the system as a perturbed harmonic oscillator. In contrast to a canonical simplification, our method involves only polynomial manipulations in two variables. Only after the change of time do we start manipulating elliptic functions in an exhaustive discussion of the flows.  相似文献   

南沙海区礼乐盆地沉积地层与构造特征分析   总被引：4，自引：1，他引：3  

孙龙涛  孙珍  周蒂  刘海龄 《大地构造与成矿学》2008,32(2):151-158

通过对地震剖面、钻井及拖网采样资料的分析,认为礼乐盆地发育有海相的中、新生代地层,存在晚白垩世与晚渐新世两个区域性不整合面,将沉积层分为三套构造层:下构造层较厚,为中生代地层,表现为翘倾断块和宽缓背斜两种构造样式;中构造层较薄甚至局部缺失,为古新世-早渐新世充填的张裂期沉积,表现为半地堑构造样式;上构造层为晚渐新统至第四系沉积,充填区域沉降期海相地层,地层较为平稳。在中构造层沉积过程中发育多排NE向控洼断裂,断裂倾向NW,形成多个半地堑,控制了新生代早期的沉积充填,同时也表现出礼乐盆地在新生代早期受明显的张裂作用。通过对各构造层的构造、沉积特征分析,认为礼乐盆地经历了挤压、拉张、漂移、区域沉降四个构造演化阶段,是一个以中生代地层为主的叠合盆地。  相似文献   

河南小秦岭杨砦峪金矿床的原生叠加晕模式   总被引：8，自引：0，他引：8  

李惠  王支农 《黄金地质》1997,3(1):55-62

研究表明，杨砦峪金矿床具有多期多阶段叠加成矿的特点，研究和建立了该矿床的原生叠加晕模式，总结了应用模式找矿的准则。  相似文献   

甘肃小柳沟钨钼多金属矿田构造叠加晕浅析及找矿预测     

林森 《地质与勘探》2016,52(5):874-884

通过对小柳沟钨钼多金属矿田地质地球化学特征及前人资料的综合研究,以小柳沟矿田中部祁青钼矿床4线构造叠加晕和深部成矿预测研究为重点,用围岩31件背景样品的几何平均值,为构造叠加晕分带提供地球化学背景依据;以小柳沟钨钼多金属矿单期次成矿原生晕轴向分带序列(自下而上)Cr、Co、Ni、V、Ti→W、Mn、Be、Sn、Bi、Mo、Cu→Pb、Zn、Ag→Au、As、Sb为基础,分析认为祁青钼矿4线构造叠加晕轴向分带序列(自下而上)Cu、Mo、Pb、Sb→As、Zn、Sn、Nb→Bi、V、Ti、Ba、Cr→Mn、W、B具"反分带"特征,且存在地球化学参数"反转"现象,指示成矿作用有叠加,预测深部存在第二成矿空间,钻探工程验证在祁青钼矿深部发现含钼隐伏花岗岩体,且岩体上部仍有石英脉型钼矿体,证实了构造叠加晕对深部找矿预测的有效性。认为小柳沟矿田深部斑岩型钼矿资源潜力较大,晚期花岗岩体凸起部位和外围分别是是寻找钼、中低温硫化物有关的铅锌矿床的有利地带。  相似文献   

Structural Characteristics and Formation Dynamics: A Review of the Main Sedimentary Basins in the Continent of China     

HE Bizhu  ZHENG Menglin 《《地质学报》英文版》2016,90(4):1156-1194

The formation and evolution of basins in the China continent are closely related to the collages of many blocks and orogenic belts. Based on a large amount of the geological, geophysical, petroleum exploration data and a large number of published research results, the basement constitutions and evolutions of tectonic–sedimentary of sedimentary basins, the main border fault belts and the orogenesis of their peripheries of the basins are analyzed. Especially, the main typical basins in the eight divisions in the continent of China are analyzed in detail, including the Tarim, Ordos, Sichuan, Songliao, Bohai Bay, Junggar, Qiadam and Qiangtang basins. The main five stages of superimposed evolutions processes of basins revealed, which accompanied with the tectonic processes of the Paleo–Asian Ocean, Tethyan and Western Pacific domains. They contained the formations of main Cratons(1850–800 Ma), developments of marine basins(800–386 Ma), developments of Marine–continental transition basins and super mantle plumes(386–252 Ma), amalgamation of China Continent and developments of continental basins(252–205 Ma) and development of the foreland basins in the western and extensional faulted basin in the eastern of China(205–0 Ma). Therefore, large scale marine sedimentary basins existed in the relatively stable continental blocks of the Proterozoic, developed during the Neoproterozoic to Paleozoic, with the property of the intracontinental cratons and peripheral foreland basins, the multistage superimposing and late reformations of basins. The continental basins developed on the weak or preexisting divisional basements, or the remnant and reformed marine basins in the Meso–Cenozoic, are mainly the continental margins, back–arc basins, retroarc foreland basins, intracontinental rifts and pull–apart basins. The styles and intensity deformation containing the faults, folds and the structural architecture of regional unconformities of the basins, responded to the openings, subductions, closures of oceans, the continent–continent collisions and reactivation of orogenies near the basins in different periods. The evolutions of the Tianshan–Mongol–Hinggan, Kunlun–Qilian–Qinling–Dabie–Sulu, Jiangshao–Shiwandashan, Helanshan–Longmengshan, Taihang–Wuling orogenic belts, the Tibet Plateau and the Altun and Tan–Lu Fault belts have importantly influenced on the tectonic–sedimentary developments, mineralization and hydrocarbon reservoir conditions of their adjacent basins in different times. The evolutions of basins also rely on the deep structures of lithosphere and the rheological properties of the mantle. The mosaic and mirroring geological structures of the deep lithosphere reflect the pre–existed divisions and hot mantle upwelling, constrain to the origins and transforms dynamics of the basins. The leading edges of the basin tectonic dynamics will focus on the basin and mountain coupling, reconstruction of the paleotectonic–paleogeography, establishing relationship between the structural deformations of shallow surface to the deep lithosphere or asthenosphere, as well as the restoring proto–basin and depicting residual basin of the Paleozoic basin, the effects of multiple stages of volcanism and paleo–earthquake events in China.  相似文献