韧性剪切构造成岩成矿作用及对金矿化的控制--以内蒙古武川县后石花金矿为例

本文以内蒙古中部后石花金矿为例,简述了"韧性剪切构造成岩成矿作用"的新观点.研究表明,韧性剪切成岩过程包括细粒化作用、热流体作用、酸碱交代作用;韧性剪切带这种深层次断裂构造形成过程中,其推覆演化是逐渐减压过程,降压效应和剪切带本身的膨胀渗透作用,引起了剪切带内部积累的能量梯度(压力、温度、物质),导致弥漫于大面积围岩中和下地壳的液体进入韧性剪切带中."节流阀"作用形成韧性剪切成岩成矿热液系统.韧性剪切构造对金矿的控制核心是成岩成矿为统一的热动力系统,早期以成岩为主,中晚期以蚀变和矿化为主.     

Stability Analysis on Speed Control System of Autonomous Underwater Vehicle

The stability of the motion control system is one of the decisive factors of the control quality for Autonomous Underwater Vehicle (AUV).The divergence of control,which the unstable system may be brought about,is fatal to the operation of AUV.The stability analysis of the PD and S-surface speed controllers based on the Lyapunov' s direct method is proposed in this paper.After decoupling the six degree-of-freedom (DOF) motions of the AUV,the axial dynamic behavior is discussed and the condition is deduced,in which the parameters selection within stability domain can guarantee the system asymptotically stable.The experimental results in a tank and on the sea have successfully verified the algorithm reliability,which can be served as a good reference for analyzing other AUV nonlinear control systems.     

Change of ancient hydrology net in Northeast China Plain

Comparing with lithofacies palaeogeography of several great plains,the authors analyzed four great plains in Quaternary diastrophism,the sedimentary facies,sedimentary environment and their evolution from the independent embryonic and river system of ancient Heilongjiang finally to the Halar highland,Songnen Plain,Sanjiang Plain,the Xingkai Lake Plain and various river systems,collected the unification outside the system of Heilongjiang River to release into the sea,south ancient Xialiao River finally piracy Dongliao River,Xialiao River had released into the sea the ancient water law vicissitude and the evolved rule.     

江汉平原沉积物重矿物特征及其对三峡贯通的指示

江汉平原是长江穿过三峡区的第一个大型卸载盆地, 其沉积物必然反映长江流经的物源区的物源特征.通过对盆地中心周老孔第四纪岩心的重砂样品中0.125~0.063mm粒级的重矿物含量变化、ATi、GZi、ZTR指数和重矿物组合分析, 发现从钻孔岩心深度110m开始向上, 水动力条件加强, 沉积速率加快, 重矿物的数量特征发生明显突变, 特征矿物的组合与现代长江相同.表明在周老孔岩心深度110m (古地磁年龄1.1Ma左右) 位置处, 长江三峡开始贯通, 江汉平原开始接纳长江带来的三峡上游的物质.      

The strong ground motion observation for the Wenchuan aftershock

In this paper, the mobile strong ground motion observation for the destructive earthquake is introduced.Considering the characteristics and its spatial distributions of aftershock, 59 strong ground motion instruments were installed along the Longmenshan fault area, and more than 2 000 records have been accumulated.It shows that it is necessary to per-form the mobile strong ground motion observation after the destructive earthquake, and the precious collected data could be applied for further research.     

中国东北地区地震活动特征及其与日本海板块俯冲的关系

分析中国东北地区深震 (mb≥ 6 .0 )及浅震 (MS≥ 5 .0 )的成组性活动特征 ,研究了深震“强震组”与浅震“强震组”的时、空相关性。着重探讨了西太平洋板块与欧亚板块碰撞带的地震分布特征及其与西太平洋俯冲带形态的关系 ,并着重分析了西太平洋板块对欧亚板块地震活动的影响。结果表明 :西太平洋板块俯冲倾角小的地区 ,板块碰撞带地震活动强烈 ,板块俯冲对欧亚大陆的影响也较强 ,俯冲带处于较强的挤压应力状态 ;西太平洋板块俯冲倾角大的地区 ,板块碰撞带地震活动较弱 ,板块俯冲对欧亚大陆的影响也较弱 ,深部俯冲带引张应力增强。分析认为 ,未来 10年中国东北地区将进入浅震“强震组”活动时段 ,期间可能发生MS≥ 5 .0地震 6次左右 ,应加强东北地区的地震监测预报工作     

Ground motion attenuation of M_s8.0 Wenchuan earthquake

The great MS8.0 Wenchuan earthquake has been the most destructive earthquake since 1949 in China. The earthquake occurred no more than half a year after the establishment of the National Strong Motion Observation Network System (NSMONS) of China; what is more, the epicenter was located in the area with dense strong motion observation stations so that a large number of strong motion records of the main shock were obtained. In this paper, 501 strong motion records from 167 observation stations are utilized to...     

A Method for Calculation of Low-Frequency Slow Drift Motions Based on NURBS for Floating Bodies

Through a higher-order boundary element method based on NURBS (Non-uniform Rational B-splines), the calculation of second-order low-frequency forces and slow drift motions is conducted for floating bodies. In the floating body′s inner domain, an auxiliary equation is obtained by applying a Green function which satisfies the solid surface condition. Then, the auxiliary equation and the velocity potential equation are combined in the fluid domain to remove the solid angle coefficient and the singularity of th...     

A Crashworthy Device Against Ship-OWT Collision and Its Protection Effects on the Tower of Offshore Wind Farms

At present,more and more offshore wind farms have been built and numerous projects are on the drawing tables.Therefore,the study on the safety of collision between ships and offshore wind turbines (OWT) is of great practical significance.The present study takes the advantage of the famous LS-DYNA explicit code to simulate the dynamic process of the collision between a typical 3MW offshore wind turbine model with monopile foundation and a simplified 2000t-class ship model.In the simulation,the added mass eff...     

森林3S技术青年专家--冯仲科教授

冯仲科教授生于1962年5月,甘肃省灵台县人,北京林业大学资源与环境学院测绘与3S技术教授,博士,博士生导师,地理信息系统学科负责人,森林经理学科3S方向学术带头人,北京林业大学测绘与3S技术中心主任,国际测绘杂志《GIM》中国唯一编委,中国GPS应用研究会常务理事,资源与环境监测专业委员会常务副主任委员、秘书长,中国测绘学会理事,矿山测量专业委员会副主任委员,中国博士联谊会常务理事,国际矿山测量协会(ISM)第六专业委员会委员,北京测绘学会理事,测绘教学研究委员会副主任委员,教育部全国测绘学科指导委员会委员,济南市客座专业技术…