Genetic Algorithms of Structural Fuzzy Reliability Index

In this paper the simple generation algorithms are improved.According to the geometricmeaning of the structural reliability index,a method is proposed to deal with the variables in the standardnormal space.With consideration of variable distribution,the correlation coefficient of the variables andits fuzzy reliability index,the feasibility and the reliability of the algorithms are proved with an example ofstructural reliability analysis and optimization.     

An Expression of Apparent Energy Distribution of Sea Waves by Wave Characteristics

Based on observed wind waves,the relationships between wave spectrum products and wavecharacteristics are established successfully,and the apparent energy distribution of sea waves is expressed as afunction of wave characteristics.     

Effect of Nonlinearity on Groupiness of Random Wave Fields

Theoretical studies so far on random wave groups have all been in linear ways.Methods to sim-ulate random wave groups,an important subject in ocean engineering,also employ relationship resulting froma Gaussian process.Many filed measurements have shown that the real sea surfase displacement deviatessomewhat from Gaussian distribution.Tayfun et al.have further depicted in theory that the envelope spectralpeak frequency is constantly zero for a Gaussian process which means that the groupiness factors will be con-stants,too.In this paper,the effect of nonlinearity on groupiness of a random wave field is examined via thetheoretical results derived by Tayfun et al.from an expression of amplitude-modulated Stokes waves.Whenthe surface displacement is treated as a non-Gaussian process,it is found that the group height factors GF_1and GF_2 proposed by Zhao et al.and Yu et al.,respectively,depend on a nonlinearity factor as well as aspectrum-bandwidth factor,deferring from the case of a Gaussion process.Compariso     

Nonlinear Dynamic Behavior of Moored Buoy Excited by Free Surface Waves

In this paper, studied are the dynamics of a moored buoy near the surface subjected to wave excitation. According to the physical structure, submersible buoy moored by tethered line is modeled firstly. Then from the differential equations, the natural frequencies are estimated by neglecting the coupling between tangential and normal direction. By use of numerical integration method, solutions are obtained. On this basis, strange attractors and bifurcation phenomena are obtained by applying Poincare map, pha...     

Immune response of Pseudosciaena crocea to the injection of Vibrio alginolyticus

For the investigation of anti-infection immune response of Pseudosciaena crocea, 160 healthy fish samples were categorized into infected and control groups. Each individual fish in the infected group was injected intraperitoneally (i.p.) with 0.2 ml bacterial suspension of Vibrio alginolyticus in density of 2×107 CFU/ml, while each individual in the control group was injected i.p. with 0.2 ml sterile saline solution (0.85%). It was observed that the artificial injection of V. alginolyticus significantly inc...     

胶辽地块古元古代构造—热演化与深部过程

近年来的研究表明，华北克拉通由东部地块和西部地块于1．85Ga沿中部带碰撞形成，且碰撞前东部地块的西缘为活动陆缘，研究程度高。相比之下，东部地块的东缘大面积分布的古元古代胶辽吉造山带研究薄弱。根据新近多学科研究成果，综合揭示出胶辽吉造山带古元古代的构造—热演化和深都地质作用过程如下：早期底侵可能与深都地幔柱相关，发生于2．53～2．36Ga之间，导致2．47～2．33Ga岩墙事件、胶辽吉裂谷带的形成和双峰式火山活动。该幕底侵不仅导致地壳上都沉积格架的不同，也导致地壳内初始热结构的分异，从而决定不同空间上变质作用类型和PTt轨迹的差异。晚期底侵导致地壳下部于2．17Ga左右产生A型辽吉花岗岩、2．2Ga与2．0Ga的伟晶岩事件和顺层伸展变形。其主要的造山运动发生在1．911～1．883Ga之间，裂谷封闭、收缩变形，在该造山带南部出现高压变质。之后，1．875～1．66Ga之间，出现小断块的拆沉、环斑花岗岩、钾长花岗岩和正长岩的非造山岩浆事件、伟晶岩脉和基性岩墙群事件和榆树砬子群沉积。东都地块南缘大别—苏鲁一带1．7～1．6Ga期间应是一个重要的古元古代强烈活动陆缘带。中元古代1．6Ga以后大别—苏鲁一带经历了一系列再造事件而与东都地块主体形成显著差异。总之，胶辽吉造山带的底侵样式、碰撞过程、拆沉方式都直接制约着浅部地壳的构造—热演化特征。     

THE MEANDER OF KUROSHIO AND OSCILLATION IN A COUPLED OCEAN-ATMOSPHERE MODEL

A numerical experiment of an asynchronous coupled ocean-atmosphere model has been described in this paper.Atwo-layer global atmosphere general circulation model(OSU/IAP-AGCM)and a two-layer North Pacific Oceangeneral circulation model(NPOGCM)developed by Liu et al.(1992)are used in numerical experiment.The sea surfacetemperature anomaly(SSTA)corresponding to the meander of the Kuroshio is treated as the initial perturbation in thePacific Ocean and the abnormal phenomena caused by the disturbance and the interaction between atmosphere andocean,have been studied.The numerical experiment showed that the SST anomaly in the North Pacific could induce a new 30—60 dayoscillation through the coupling between atmosphere and ocean and the interaction between the meander of theKuroshio and atmosphere circulation is a positive feedback process.     

半咸水湖盆碳酸盐岩层序地层分析——以东营凹陷南坡中段沙四上亚段为例

湖相碳酸盐岩分布于淡水湖盆和咸水湖盆地中,不同类型湖盆碳酸盐岩层序发育特征与构成样式明显存在差异。综合利用岩芯、录井、测井及地震等资料,对东营凹陷南坡中段地区进行了层序地层分析,发现湖相碳酸盐岩主要分布在湖侵体系域,研究区主要存在五种准层序类型：油页岩—白云岩型、油页岩—泥（晶）灰岩型、深水（泥）页岩—颗粒灰岩型、（泥...     

山东兖州东滩早二叠世孢粉组合

对山东兖州东滩补33孔(地理坐标北纬35°27'19"、东经116°51'32")采取孢粉样品并进行了分析,从太原组到下石盒子组都有大量孢粉化石,经分析鉴定和统计,共发现孢粉化石55属155种及部分未定种。根据孢粉属种的纵向分布规律及含量的变化,建立了本区早二叠世3个孢粉组合,自上而下为:.Florinites-Punctatisporites组合(428.36～369.10m);.Punctatisporites-Sinulatisporites组合(543.43～496.95m);.Thymospora pseudothiessenii-T.thiessenii组合(589.20～550m)。本孔孢粉组合与华北地区的孢粉组合以及其他地区的孢粉组合进行对比,由于华北地区石炭系—二叠系界线与国际接轨,移至Pseudoschwagerina带之底,因此,孢粉组合时代分别为早二叠世早期、早二叠世中期、早二叠世晚期。最后,结合层序地层划分分析了古气候变化。     

实际储层温压条件下成功合成碳酸盐岩烃类包裹体及其启示意义

文中报道在实际储层温压条件下(150℃,40MPa,大约4km深度)成功合成了碳酸盐岩烃类包裹体。通过对合成烃类包裹体的显微观察、荧光分析和傅里叶变换红外光谱分析,证实合成了烃类包裹体,且与真实储层中的包裹体具有相似特征,探讨了油水不混溶条件下的流体包裹体捕获机制。实验研究给出4点重要启示:(1)油水不混溶是造成烃类包裹体和水溶液包裹体分带的主要原因;(2)油气快速成藏过程可以被流体包裹体记录;(3)实际储层温压条件下,合成烃类包裹体实验研究有望为储层包裹体分析提供依据和标准;(4)人工合成烃类包裹体为研究含油气条件下储层水-岩作用机理提供了一种有效手段。