内蒙古中部早古生代地体的拼合与增置   总被引：5，自引：0，他引：5  

李双庆 《内蒙古地质》1997,(1)

内蒙古中部布龙山、温都尔庙一带的蛇绿岩套、蓝门石片岩及其南邻的华北地台两者在空间上以川井－布鲁台庙深大断裂带为界，在时间上具有截然不同的地质演化特点。其内部在构造演化史上也不尽相同，可进一步划分为布龙山－哈拉地层地体和白乃庙－温都尔庙混杂地体。这两个曾分离着的地体，经长时期的运移，于晚志留世之前拼合联为一体，构成早古生代联合地体。直到早二叠世才增置于中朝古板块北缘（或华北地台北缘）。  相似文献   

The Effect of the Great Inequality on the Hecuba Gap     

Jacques Henrard 《Celestial Mechanics and Dynamical Astronomy》1997,69(1-2):187-198

The effects of the "great inequality" (the quasi-resonance between Jupiter and Saturn) on the motion in the 2/1 mean motion resonance with Jupiter (the Hecuba gap) is investigated. We confirm the proposition made by Ferraz-Mello and collaborators that the great inequality generates secondary resonances which are likely to produce the slow diffusion observed in numerical investigations. We identify, in the restricted three body problem, the frequencies responsible for these secondary resonances. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Chaotic Advection of the Shallow Kuroshio Coastal Waters   总被引：1，自引：0，他引：1  

Takuji Waseda  Humio Mitsudera 《Journal of Oceanography》2002,58(5):627-638

The shallow coastal water of the Enshu-Nada Sea (ENSW) recirculates regardless of whether the Kuroshio path is straight or has meanders. The recirculation is formed as a result of flow separation at the sharp coastline. The outputs of a recent numerical simulation of the Kuroshio current, including case of a short-term meander caused by an anticyclonic eddy, were analysed to track the motion of the ENSW. In contrast to the steady-flow cases, the unsteady cases showed that the ENSW discharges into the Kuroshio Extension region and intrudes further north into the Kuroshio-Oyashio confluence region due to chaotic advection. Two hyperbolic stagnation points of the velocity field characterise the transport paths; one south of the Izu peninsula and the other at the Kuroshio Extension. This mechanism exists even without the Ekman drift and may play an important role in the transportation of the fish eggs and larvae from the southern Japan spawning ground to the food abundant Kuroshio-Oyashio transition zone. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Some observational results of sea storm current   总被引：3，自引：0，他引：3  

Xiu Richen  Liu Aiju  Ye Hesong  Gu Yuhe  Xu Lanying 《海洋学报(英文版)》2001,20(2):299-308

INTRODUCTIONDr. Hollister, a marine geologist of the Woods Hole Oceanographic Institution, firstpointed out that there was ocean storm current in the ocean. He found out the wavy texture inthe seabed core samples, and suggested that this wavy texture was caused by the high speedsea current in remote antiquity. He then suggested a bold hypothesis that there existed a benthic storm current near the ocean bottom, and presented this hypothesis at the IUGG confer-ence held at San Francisco…  相似文献   

Temporal scaling in river flow: can it be chaotic? / L’invariance d’échelle de l’écoulement fluvial peut-elle être chaotique?     

《水文科学杂志》2013,58(3)

Abstract

Abstract Identification of the presence of scaling in the river flow process has been a challenging problem in hydrology. Studies conducted thus far have viewed this problem essentially from a stochastic perspective, because the river flow process has traditionally been assumed to be a result of a very large number of variables. However, recent studies employing nonlinear deterministic and chaotic dynamic concepts have reported that the river flow process could also be the outcome of a deterministic system with only a few dominant variables. In the wake of such reports, a preliminary attempt is made in this study to investigate the type of scaling behaviour in the river flow process (i.e. chaotic or stochastic). The investigation is limited only to temporal scaling. Flow data of three different scales (daily, 5-day and 7-day) observed in each of three rivers in the USA: the Kentucky River in Kentucky, the Merced River in California and the Stillaguamish River in Washington, are analysed. It is assumed that the dynamic behaviour of the river flow process at these individual scales provides clues about the scaling behaviour between these scales. The correlation dimension is used as an indicator to distinguish between chaotic and stochastic behaviours. The results are mixed with regard to the type of flow behaviour at individual scales and, hence, to the type of scaling behaviour, as some data sets show chaotic behaviour while others show stochastic behaviour. They suggest that characterization (chaotic or stochastic) of river flow should be a necessary first step in any scaling study, as it could provide important information on the appropriate approach for data transformation purposes.  相似文献   

基于三维混沌序列的DEM置乱与还原方法     

仲浩宇  王中元  李安波 《测绘通报》2019,(5):64-71

DEM是地形的真实表达，蕴含着丰富的地理空间信息。如何保证涉密DEM在网络环境中的安全传输是当前亟待解决的关键问题之一。本文采用三维混沌序列，对DEM文件先后进行高程置乱、位置置乱和文件头置乱，可使置乱后的数据失去高程变化的空间连续性与数值连续性。置乱数据经网络传输后，接收方仅凭用户密钥就可以实现置乱DEM数据的无损、盲式还原。基于ASCⅡ格式DEM的置乱与还原试验表明：本文方法可以有效破坏原始DEM数据的空间形态特征和空间连续性，并具有较高的安全性。此外，在无原始数据参与的情况下，用户可以将置乱数据恢复至初始形态，且不会造成任何精度损失。本文算法特性基本满足了DEM数据在安全传输、封装存储等方面的应用需求。  相似文献   

Theoretical and experimental study of Chen chaotic system with notch filter feedback control     

张晓明  陈菊芳  彭建华 《海洋学报(英文版)》2010,29(9)

Since the past two decades, the time delay feedback control method has attracted more and more attention in chaos control studies because of its simplicity and efficiency compared with other chaos control schemes. Recently, it has been proposed to suppress low-dimensional chaos with the notch filter feedback control method, which can be implemented in a laser system. In this work, we have analytically determined the controllable conditions for notch filter feedback controlling of Chen chaotic system in terms of the Hopf bifurcation theory. The conditions for notch filter feedback controlled Chen chaoitc system having a stable limit cycle solution are given. Meanwhile, we also analysed the Hopf bifurcation direction, which is very important for parameter settings in notch filter feedback control applications. Finally, we apply the notch filter feedback control methods to the electronic circuit experiments and numerical simulations based on the theoretical analysis. The controlling results of notch filter feedback control method well prove the feasibility and reliability of the theoretical analysis.  相似文献   

基于神经网络的混沌时间序列预测     

孙涛  李健  郑豫  代理 《成都信息工程学院学报》2008,23(2):126-131

为了提高了RBF神经网络对于混沌时间序列的预测性能,从相空间重构理论出发,建立RBF神经网络,并且改变RBF神经网络训练参数及训练样本数,以Logistic及Lorenz混沌时间序列进行预测仿真,取得了不错的预测效果。  相似文献   

一个切换混沌系统的设计与实现   总被引：5，自引：1，他引：4  

王忠林  刘滨  王树斌 《中国海洋大学学报(自然科学版)》2009,39(3)

利用反控制法构造了1个新的混沌系统,分析新系统的平衡点及在平衡点的特征值,分形维数,Lyapunov指数等性质,设计1个由2个混沌系统组成的可切换的实际电路并进行实验,通过1个开关选择器,电路可以实现2个子系统的功能,观察到2个子系统在各个相平面的混沌吸引子.  相似文献   

分数阶混沌系统与整数阶混沌系统之间的同步   总被引：1，自引：0，他引：1  

周平  邝菲 《海洋学报》2010,32(10):6851-6858

基于追踪控制的思想,利用分数阶系统稳定性理论,实现了分数阶混沌系统与整数阶混沌系统之间的混沌同步,给出了补偿器和反馈控制器的选择方法. 以三维分数阶Chen系统和三维整数阶Lorenz混沌系统之间的混沌同步为例进行了数值仿真和电路仿真. 研究表明了该同步方法的有效性.  相似文献