Pressure-Temperature Contours and PT Paths of the Early Precambrian Rocks through the Yinshan Area and Their Implication to the Crustal Evolution     

MEI Hualin  WU Changhua Tianjin Institute of Geology  Mineral Resources  CAGS  Tianjin.  JIN Wei Changchun University of Earth Sciences  Changchun  Jilin Hao Zhiguo Liu Xinzhu 《《地质学报》英文版》1998,72(1):14-28

Four distinct lithe-tectonic belts (zones) in the Yinshan area, North China, were identified by pressure-temperature contours and litho-tectonic features, such as the Sanggan granulite belt, Jining metasedimentary belt. Wulashan-Daqingshan front tectonic zone and Se' eratengshan belt. This area witnessed two important thermo-tectonic events. The older one is c. 2.5 Ga while the younger one c. 1.9 Ga. The Se' ertengshan Neoarchaean terrane features a clockwise PT path with the decompression ranging from > 1500 MPa to 800-1000 MPa in the Se' ertengshan belt, which implies an island arc setting. The Sanggan belt is a Mesoarchaean microcontinent reworked by Neoarchaean magma underplating, which shows an counterclockwise PT path. During the Palaeoproterozoic period, two Archaean continent (arc) collided. The Archaean basement of the Sanggan and Wulashan-Daqingshan belts overthrust northwards, the PTt paths of basement show a decompression from 1000-1200 MPa to 500-700 MPa. The PT paths of the Jining and Erda  相似文献   

微计算机生物医学测控系统     

冯天瑾  申钧  茅海萼 《中国海洋大学学报(自然科学版)》1988,(2)

生物医学领域中许多工作对微计算机系统的要求常常是共同的。对信号应进行实时监视、记录、处理分析、存贮或输出。有些工作还要求系统给出触发信号,或能自动响应生物的行为反应。本文介绍一种生物医学微机测控系统的原理。作者研制的系统基于APPLE Ⅱ微机(已投入生产)和IBM PC,PC/XT微机,也容易转到其他计算机上。当然,该系统也可开拓应用到其他科技领域。  相似文献   

Underwater Explosion Technology for Offshore Engineering Applications     

Hu Tiezhao Senior Engineer  Bohai Oil Company  Tianjin 《中国海洋工程》1992,(3)

- This article briefs how to improve the holding power of a drilling vessel's anchor and to remove those unreasonable structures by such a technology - underwater-explosion technology. The article gives details of the structure, characteristics and applications of a rocket-launched anchor; as well as the principle, properties, applications of directional explosion cutting.  相似文献   

Experimental Research of Hexagon Multihole Armour Block on Breakwater     

Gu Hanbin Sun Jingshi Engineer  Tianjin Research Institute of Water Transport Engineering  Tanggu: Professor  Tianjin Research Institute of Water Transport Engineering  Tanggu: 《中国海洋工程》1995,(4)

This paper introduces a new kind of armour block - hexagon multihole block on sloping breakwater. It has great characteristics such as good interlocking, strong resistance against waves and saving concrete. Through the hydraulic model test, the mechanism of stability of the block has been proved and the relations between stability and wave height, wave period, water depth, slope, laying method, porosity and cushion have been found. The effect of weight on steadiness have also been discovered. Finally, the method of design and some formulas are given.  相似文献   

Generation and Properties of Freak Waves in A Numerical Wave Tank   总被引：3，自引：3，他引：3  

韩涛张庆河  庞红犁秦崇仁 《中国海洋工程》2004,18(2):281-290

Freak waves are generated based on the mechanism of wave focusing in a 2D numerical wave tank. To set up the nonlinear numerical wave tank, the Boundary Element Method is used to solve potential flow equations incorporated with fully nonlinear free surface boundary conditions. The nonlinear properties of freak waves, such as high frequency components and wave profile asymmetry, are discussed. The kinematic data, which can be useful for the evaluation of the wave forces exerted on structures to avoid underestimation of linear predictions, are obtained, and discussed, from the simulated results of freak waves.  相似文献   

Experiment for Determination of Dry-Laid Stone Armour Layer Thickness of Rubble Mound Breakwaters     

Sun Jingshi Zhu Yiming Research Professor  Tianjin Research Institute of Water Transport Engineering  Tianjin Associate Professor  Dalian Aquatic Product Institute  Dalian 《中国海洋工程》1995,(1)

Through hydraulic model experiment and site investigation, this paper has derived a calculation formula of dry-laid stone armour layer thickness of rubble mound breakwaters for fishery harbours. The influences of the friction force between stone blocks and the variations of wave length or period and water depth are considered in the formula. The calculated results of several existing structures are in good agreement with field data. This formula is more practical than those ever published both at home and abroad, and has been adoptted by the technical standards of aquatic projects published by the Ministry of Agriculture of China. It is applicable for the calculation of dry-laid stone armour layer of breakwater for small- or medium-size harbours.  相似文献   

Design of Submarine Pipeline in BZ34-2/4 Oil Field     

Wang Jinying Senior Engineer  Bohai Engineering  Design Company  Tianjin 《中国海洋工程》1992,(3)

This paper presents the detail design conditions, design criteria and methods as well as design conclusions of the process, structure and corrosion of the production flowlines and high pressure water injection lines in BZ34-2 / 4 oil field in Bohai Bay. At present this design represents the design capability and level in the field of the submarine pipeline engineering of China.  相似文献   

Numerical Simulation of Sand Shoreline Evolution Under Action of Regular Waves and Irregular Waves     

Tao Jianhua Tian Zhenfu Professor  Dept. of Mechanics  Tianjin University  Tianjin Assistant  Dept. of Mathematics  Ningxia University  Yinchuan  Ningxia Hui Autonomous Region 《中国海洋工程》1991,(1)

Based on the singleline theory, a numerical simulation is presented to predict the shoreline evolution on sand beach. A parabolic equation of longshore sediment transport and boundary conditions are proposed. The combined effect of wave diffraction and refraction on the shoreline evolution on the downdrift side of the breakwater is taken into account and is calculated using the theory of regular waves and irregular waves. The present model is verified by the field observation data of erosion for half a year on the downdrift side of a harbor, and compared with some experimental results. The numerical results are in good agreement with the field measured and experimental data.  相似文献   

Settlement and Stability Analysis on Soft Clay Under Cyclic Loading   总被引：5，自引：0，他引：5  

Yan Shuwang  Yang Jinliang Yan Chi Professor  Tianjin University  Tianjin Assoc. Professor  Tianjin University  Tianjin Lecturer  Tianjin University  Tianjin 《中国海洋工程》1992,(4)

The results of undrained cyclic triaxial tests on three types of clays are collected and a relationship among the accumulated strain, the initial stress state, cyclic stress in the soil, as well as the number of cycles is established based on the experimental data. With this relationship, a procedure is proposed for subsidence and stability analysis on soft clay under the action of cyclic loads.  相似文献   

A Finite Element Method for Cracked Components of Structures     

刘立名  段梦兰  秦太验  刘玉标  柳春图  余建星 《中国海洋工程》2003,17(2)

1 .IntroductionOffshoreplatformsarelargescalesteelorconcretestructures.Theyexperiencevariouskindsofdamagessuchasdents ,corrosionpits ,cracks ,deformation ,etc .,afteryearsofenvironmentalimpactofwinds ,waves ,currents ,soilreactions ,earthquakesandice (DuanandLiu ,1 995) .Thesafetyofthestructureshasalwaysbeenthemostimportantissueconcerned ,anditdependsontheassessmentoftheintegrityofthestructures,orspecificallyontheassessmentofthedamagesinthestructures .Riclesetal.( 1 994)experimentallyinvestig…  相似文献