南黄海海域的海相地层含油气系统     

李刚  吴时国 《海洋地质前沿》2007,23(7):27-32

南黄海海域油气勘探近40年成果证实,南黄海盆地与相邻的苏北盆地具有相似的发育历史。目前,苏北已在中、古生界近50口钻井中见到油气显示,其中在下三叠统青龙组和上石炭统船山组发现了大量油气显示,在盐城朱家墩发现源于中、古生界的再生气田,在黄桥镇苏174井志留系坟头组以及泥盆系五通组砂岩中钻遇液态CO2及轻质油,证明下扬子中、古生界存在油气生成和运聚的成藏过程,具有良好的油气勘探前景。  相似文献   

Numerical simulation of solitary wave scattering by a circular cylinder array   总被引：1，自引：0，他引：1  

Ming Zhao  Liang Cheng  Bin Teng 《Ocean Engineering》2007,34(3-4):489-499

The interaction of a solitary wave with an array of surface-piercing vertical circular cylinders is investigated numerically. The wave motion is modeled by a set of generalized Boussinesq equations. The governing equations are discretized using a finite element method. The numerical model is validated against the experimental data of solitary wave reflection from a vertical wall and solitary wave scattering by a vertical circular cylinder respectively. The predicted wave surface elevation and the wave forces on the cylinder agree well with the experimental data. The numerical model is then employed to study solitary wave scattering by arrays of two circular cylinders and four circular cylinders respectively. The effect of wave direction on the wave forces and the wave runup on the cylinders is quantified.  相似文献   

人工饲料饲养的对虾肠道菌群和水体细菌区系的研究   总被引：9，自引：0，他引：9  

杨莺莺  李卓佳  林亮  郭志勋 《热带海洋学报》2006,25(3):53-56

对人工饲料饲养的凡纳滨对虾Litopenaeus vannamei成虾肠道菌群组成及其水体细菌区系组成进行了研究.分离纯化后的革兰氏阴性菌鉴定到种的水平.对虾肠道菌群主要由弧菌Vibrio spp.、希瓦氏菌属Shewnella spp.、嗜氢菌属Hydrogenophaga spp.、伯克霍尔德氏菌Burkholderia spp.、气单胞菌Aeromonas spp.、食酸菌Acidovorax spp.和芽孢杆菌Bacillus spp.组成.水体细菌区系主要包括弧菌Vibrio spp.、希瓦氏菌属Shewnella spp.、艾肯菌Empedobacter spp.、无色杆菌Achromobacter spp.和芽孢杆菌Bacillus spp..肠道菌群和水体细菌区系的优势菌是副溶血弧菌Vibrio parahaemolyticus和芽孢杆菌Bacillus spp..利用Shannon-Wiener指数进行多样性分析,发现虾肠道多样性指数（H）和均匀度（J）高于水体细菌区系,而丰度（D）较低.  相似文献   

Artificial upwelling induced by ocean currents —Theory and experiment     

C.T. Hsieh  P.A. Huang  D.J. Li  L.L. Chu  C.L. Wu  N.T. Liang 《Ocean Engineering》1978,5(2):83-94

A submerged apparatus, which consists of a buoy, several horizontal contraction and expansion tubes (Venturi-type tubes) and a long pipe, is expected to be used to pump the subsurface sea-water (200–300 meter depth) containing abundant nutrients to surface layer (50–100 m) by the dynamic of ocean currents. i.e. an artificial upwelling without energy cost. A preliminary experiment and analysis are undertaken and shows that the capacity of pumping the nutrient-rich sea-water is worth to build a pilot prototype model.  相似文献   

水下智能潜器的神经网络运动控制   总被引：10，自引：4，他引：10  

彭良  卢迎春  万磊  孙俊岭 《海洋工程》1995,(2)

本文介绍一种基于神经网络的水下智能潜器的运动控制方法，该方法通过在线学习，融控制与滤波为一体。计算机仿真与水池实验验证表明，该方法的控制与滤波性能良好，对环境的学习与适应能力强。该方法事实上可用于一般动力系统的控制。  相似文献   

一种基于BP算法学习的小波神经网络   总被引：2，自引：1，他引：2  

陈哲  冯天瑾  陈刚 《中国海洋大学学报(自然科学版)》2001,31(1)

为发展 Szu的基于信号表示的小波神经网络 ,提出一种多输入多输出的小波网络模型 ,网络隐层采用框架小波函数、输出层采用 Sigmoid激励函数 ,并选用“熵误差函数”以加速网络的学习速度。奇偶判别和混沌时间序列预测例子的实验结果表明了它具有良好的函数逼近能力和推广能力 ,收敛速度和均方误差均优于相同结构的多层感知器模型。  相似文献   

Resistant performance of perforation of multi-layered targets using an estimation procedure with marine application     

Cho-Chung Liang  Ming-Fang Yang  Pin-Wen Wu  Tso-Liang Teng 《Ocean Engineering》2005,32(3-4):441-468

Recently, multi-layered targets have become commonplace in both military and civilian applications, such as marine hulls, armored vehicle bodies, outside structures of bulletproof cars, and aerospace vessels. This paper studies the resistant performance of perforation in multi-layered targets. An estimation procedure is established based on the concepts of the conservation of momentum, impulse-momentum law, and conservation of energy. Experimental results of the test of Almohandes et al. are adopted to check the residual velocity of multi-layered targets. The results of the verification are good in terms of agreement for impact velocities ranging from 700 to 800 m/s, when the ratio of the projectile length to the projectile diameter (i.e. L/D) is 4.2, and the average residual velocity error of single, double- or triple-layered targets range approximately from 4.42 to 8.40%. The ballistic performance is best for the double target when the ratio of the first layer thickness to the total thickness (i.e. t₁/(t₁+t₂)) is about 0.75, and the worse performance occurs when the ratio t₁/(t₁+t₂) is 0.5. An air gap slightly influences the resistant performance of perforation in multi-layered targets. These results may serve as a useful reference for designers.  相似文献   

Monitoring the Kuroshio Extension with Dynamically Constrained Synthesis of the Acoustic Tomography, Satellite Altimeter and in situ Data     

Konstantin V. Lebedev  Max Yaremchuk  Humio Mitsudera  Iwao Nakano  Gang Yuan 《Journal of Oceanography》2003,59(6):751-763

A finite-difference quasigeostrophic (QG) model of an open ocean region has been employed to produce a dynamically constrained synthesis of acoustic tomography and satellite altimetry data with in situ observations. The assimilation algorithm is based upon the 4D variational data interpolation scheme controlled by the model's initial and boundary conditions. The data sets analyzed include direct and differential travel times measured at the array of five acoustic transceivers deployed by JAMSTEC in the region of the Kuroshio Extension in 1997, Topex/Poseidon altimetry, CTD soundings, and ADCP velocity profiles. The region monitored is located within the area 27.5°–36.5°N, 143°–155°. The results of assimilation show that mesoscale variability can be effectively reconstructed by five transceivers measuring direct and reciprocal travel times supported by relatively sparse in situ measurements. The misfits between model and data lie within the observational error bars for all the data types used in assimilation. We have compared the results of assimilation with the statistical inversion of travel time data and analyzed energy balances of the optimized model solution. Energy exchange between the depth-averaged and shear components of the observed currents reveals a weak decay of the barotropic mode at the rate of 0.2 ± 0.7⋅10⁻⁵ cm²/s³ due to topographic interaction. Mean currents in the region are unstable with an estimate of the available potential energy flux from the mean current to the eddies of 4.7 ± 2.3⋅10⁻⁵ cm²/s³. Kinetic energy transition has the same sign and is estimated as 2.8 ± 2.5⋅10⁻⁵ cm²/s³. Potential enstrophy is transferred to the mesoscale at a rate of 5.5 ± 2.7⋅10⁻¹⁸ s⁻³. These figures provide observational evidence of the properties of free geostrophic turbulence which were predicted by theory and observed in numerical experiments. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

黄海海域陆相中生界油气远景   总被引：8，自引：1，他引：8  

李刚  陈建文  肖国林  温珍河  戴春山  龚建明  闫桂京 《海洋地质前沿》2003,19(8):7-11

黄海海域油气勘探已40余载，尚未实现油气突破，其找油前景引起石油地质学家的极大关注。根据前人的认识和最新研究成果，结合邻区油气地化资料，探讨了黄海海域中生界地层生、储、盖特征，特别是白垩系，它分布广，厚度大，烃源岩达到较好生油岩标准，并且生、储、盖组合理想，中生界是该区下部油气勘探首选目标。  相似文献   

海水中液-固界面的台阶型动力学曲线 Ⅰ.动力学曲线之台阶的消长和变化规律          下载免费PDF全文

刘莲生  张正斌  蔡卫君  潘纲  杜恒清 《海洋与湖沼》1993,(2)

对海水中Zn(Ⅱ),Ca(Ⅱ),Cd(Ⅱ)与高岭石、伊利石和蒙脱石等粘土矿物;无定形水合氧化铁、α-FeOOH等铁的水合氧化物;δ-MaO_2,γ-MnOOH,水锰矿等锰的水合氧化物等30个左右实验体系的液-固界面台阶型动力学曲线进行了系统的实验测定和全面的条件研究。在实验测定上提出两种方法、互为校核。对动力学曲线之台阶的消长和变化规律作了系统研究,确定主要影响因素是:金属离子初始浓度、固体交换剂量、体系的pH值和温度,以及搅拌速度等。  相似文献