波群作用于垂直桩柱的峰力统计性质

研究具有窄谱和Ｗｅｉｂｕｌｌ波高分布的波群对非线性桩柱系统作用力的统计性质。求得了桩桩的波浪峰力的各种特征值及其比值。指出这些数值不仅是阻力一惯性力参数ｂＨ的函数，也随着波群因子而变化。本文模式更具广泛性。文中给出了一系列计算图表，可从理论计算波群作用于桩柱的波浪峰力。     

辽东半岛南部地区滨海黄土的沉积特征

分布在孙东半岛南端滨海地区的黄民庙岛群岛、胶辽半岛黄土一起构成了我国大陆黄土分布的最东界。通过对滨海马兰黄土粒度分布的因子对应分析、拟合度计算，结合滨海黄土的孢粉分析资料，初步认为：滨海黄土是风成的，是来自西北内陆的粉砂与冰期低海面海底砂混合堆积的产物，对应的样品因子载荷值及拟合度值计算表明，粒度分布中＞4φ粒级的细粒部分主要来自西北内陆，＜4φ粒级源于渤海湾西部。     

Impact of Sea-Land Interaction on Evolution of Taihu Lake

1 .IntroductionFor Lakes near the middle andlower reaches of the Yangtze River ,theformationof lake basinsisgreatly affected by geological structures ,andthe interaction betweenrivers and seas .The Taihu Lakeis locatedinthelow-lying plain nearthe east coa…     

Effects of Irregular Wave Groups on Pile Forces

The wave forces on 1, 2 and 4 vertical circular piles under the action of several wave trains of the same wave parameters, such as Hs,Tp and Mo, but different wave group factor GF are measured in the laboratory. After comparing these forces, it may be concluded that the mean and significant wave forces are almost of no difference for the wave trains with different GF. When GF is larger, the one-tenth of the wave froce extreme is slightly increased and the maximum wave force is much larger than the ones with smaller GF, to which attention must be paid in engineering practice.     

黑鲷(Acanthopagrus schlegeli)肿瘤坏死因子α cDNA的克隆及特征分析

采用同源克隆的方法，从黑鲷中获得肿瘤坏死因子(TNFα)全长cDNA序列。该序列含1288个核苷酸，可编码253个氨基酸的TNF前体蛋白。它是一种跨膜蛋白，无糖基化位点和信号肽结构。黑鲷TNFα与其它鱼类的TNFα的相似性很高，占据进化上独立的分支；与哺乳类TNFα和TNFG源于共同的祖先。基因结构分析显示，该基因含有TNF家族pmfile和TNF家族的标签序列；在参与TNFα基因二硫键形成的两个半胱氨酸和TNFα三聚体形成的位点高度保守；空间结构模拟显示，它与哺乳类TNFα的空间结构相似，都是由两个β折叠片组成，每个折叠片包含5个反向平行的β链。表达研究结果表明，黑鲷TNFα在检测的各个组织中均为组成型表达，表现为在刺激与非刺激鱼体中，都可以检测到黑鲷TNFα的表达，但是其表达水平在不同组织中有很大差异。黑鲷TNFα在头肾、脾脏和鳃的表达量较高，而在心脏、肝脏、血液、肾脏和大脑中表达量较低。     

思林水电站通航建筑物高边坡稳定分析和评价

应用ANSYS结构分析软件,模拟了思林水电站通航建筑物高边坡的地形、地质条件以及开挖的过程,建立边坡开挖的有限元计算分析模型,分析边坡在自然状态、分级开挖以及锚杆支护加固等工况下的应力、变形及其整体稳定性.定义单元的局部安全系数,得到了边坡开挖加固后稳定安全系数的分布.根据计算成果,指出现设计加固措施可以保证边坡稳定,无需增加其他工程措施.     

Main Controlling Factors on Hydrocarbon Accumulation and Distribution in Marine Sedimentary Sequences in South China

Multiple source rock assemblages were deposited in the sedimentary provinces in South China in geologic history,and some of them were destructed by and some survived against multiple tectonic movements.Therefore,multiple sources,mixed sources,and uneven distribution of sources occurred in the marine sedimentary basins in South China during the late stage of hydrocarbon pooling.Epidiagenesis of the marine carbonate reservoirs and its modification to reservoir poroperm characteristics determined the formation and the scale of natural gas pools.The exploration practices show that the large to medium gas fields mainly occur in areas with high-quality reservoirs.Detailed study of the paleo-oil accumulations and typical oil and gas reservoirs reveals that the basins experienced multiphase superimposition and modification,leading to the distribution of the Paleozoic paleo-oil accumulations and bitumen in the peripheral areas.The phenomenon that oil and gas production concentrates in the Sichuan basin indicates that the overall sealing conditions of a basin determine the oil/gas potentials and the scale of oil and gas production.This is a critical factor controlling the accumulation and distribution of gas in the marine sequences in South China.The early oil and gas pools in the Yangtze platform left billions of bitumen in the peripheral areas due to the destruction of seals.Since the Himalayan,"late-generation and late-accumulation" gas pools represented by the gas pools in the Sichuan (四川) basin were formed in the marine sedimentary sequences in South China as a result of the change of the sealing conditions.Current gas discoveries appear to be "paleo-generation and paleo-accumulation" gas pools but actually are "late-generation and late-accumulation" gas pools.These patterns of hydrocarbon pooling clearly depict themselves in western Sichuan basin and Weiyuan (威远)gas field.It is revealed that the gas pools in the Sichuan basin were mainly formed as a result of hydrocarbon phase change (thermal cracking of oil to gas),miscible migration,and dynamic equilibration since the Himalayan.A large number of gas pools were formed in the Himalayan and the gas pools in the marine sequences are characterized by late pooling; this kind of gas fields/pools are controlled by:(1) effectiveness of modification and superimposition of the marine basins,(2) effectiveness of the source rocks,(3) effectiveness of the overall preservation conditions,and (4) effectiveness of plays.     

寨上金矿床控矿因素及成矿远景分析

文章综述了寨上金矿床的地质特征,分析了控矿因素,认为泥盆系和二叠系是矿区的矿源层,构造对成矿有决定性的作用,说明了断裂与成矿的关系,从成矿地质环境、工程控制程度和物化探异常三个方面分析了成矿远景,指出矿区有着较大的找矿潜力。     

东海陆坡及邻近槽底天然气水合物成藏条件分析及前景

在西太平洋边缘海中,东海是唯一没有获得天然气水合物样品的边缘海。利用已有的地震资料、海底温度资料等,从沉积物来源、沉积地层厚度、烃源岩条件、沉积速率、海底温度—压力条件等方面对东海水合物成藏条件进行了分析。认为冲绳海槽沉积物源丰富,沉积厚度大,且发育烃源岩地层。冲绳海槽较高的沉积速率主要分布于冲绳海槽槽底沉积中心,以及西部陆坡连接海底峡谷底部的三角洲区域。根据冲绳海槽实测的海底温度数据,整个冲绳海槽地区600m以深的范围都能够满足水合物发育的温度、压力条件。以温度梯度为30℃/km计算,冲绳海槽中水合物稳定域的最大厚度为650m。冲绳海槽盆地中普遍发育的底辟构造、背斜构造等局部构造,以及网格状断裂系统,为烃类气流体的向上及侧向运移创造了有利条件,成为天然气水合物发育的有利区带。根据已经发现的BSR特征来看,东海地区天然气水合物前景广阔。     

曲靖盆地生物气成藏条件及主控因素分析

曲靖盆地新近系茨营组第三段的晚期生物气藏是新近系沉积之后,喜山运动时期各种成藏条件有效的时空配置的结果.在讨论曲靖盆地构造和沉积演化的基础上,综合分析了生物气源、储集层和盖层、圈闭形成以及天然气输导等成藏条件,阐述了生物气晚期聚集成藏条件的时空匹配关系.指出自第四纪以来,生物气源岩持续高效的产气作用是生物气成藏的物质保障,气藏的形成是生物气连续的补充大于逸散动态平衡的产物;背斜构造、砂岩上倾尖灭和砂岩透镜体圈闭是该区主要的圈闭类型;断裂和不整合面是沟通生物气源岩到圈闭的垂向和侧向输导通道,茨营组的连通砂岩体是生物气近距离运移的输导层.蔡家冲组大套湖相暗色泥岩的生物产气效率、断裂的垂向输导能力和圈闭的保存条件及其在时空上的动态配置是生物气晚期成藏的主控因素.