NOTES ON A FOSSIL FISH FROM SHANSI

The fossil fish described in this short paper was collected from Taiku,Shansi province.It is a very common species,Carassius auratus Linnaeus ofCyprinidae.The living form is widely distributed in China.I am very much     

THE NEW PETROLOGY

I suppose that one is not far wrong in saying that Petrology is thescience of rocks.But we have not made ourselves very clear by saying it.To the average student of the subject.who must judge from what he is taught,     

Wave Attenuation and Friction Coefficient on the Coral-Reef Flat

Several sets of S4 direction-wave-current-tide meters have been deployed on the coral-reef fiat of Yongshu Reef in the sea area of Nansha Islands. Based on the observational sea wave data, the attenuation characteristics of the waves propagating on the coral reef flat, the bottom friction coefficients and the transfer of wave energy are discussed in the paper. The results show that, in the relative depths of 0. 0613- 0.0867, the wave height attenuation per unit distance of wave propagation is 22.09 %-46.56%, with an average of 31.35 % ; the wave energy, attenuation coefficient, 33.74 %- 53.22%, with an average of 43.61%. The average of the bettom friction coefficients on the coral-reef flat is 0. 1346,which is about 10 times thai on the sand or silt bottom. In the couse of propagation on the reef flat, the waves sustain more loss in high frequency than in low frequency and the spectral energy transfers to the low frequency. These results may be used for reference in island and reef engineering.     

刚臂式单点系泊系统在波浪作用下的链力分析

第一个刚臂式单点系泊储油装置(SBS)于1974年在突尼斯建成,以后在各地又建成了很多个这类装置,据报导其使用效果是令人满意的[1,2].为了发展我国海洋石油勘探、开发的科学技术,在海洋石油研究所的协助下,我们对这种系泊系统进行了波浪模型试验研究,本文在试验成果的基础上,主要研究单点浮筒多链系统的静力特性和波浪要素、水深等对链力的影响,还研究了减小中链力的措施.     

Variations of Microbial Communities and the Contents and Isotopic Compositions of Total Organic Carbon and Total Nitrogen in Soil Samples during Their Preservation

Semi-sealed preservation of soil samples at different moisture of 4% and 23%,respectively, was simulated to observe the variations of soil microbial communities and determine the contents and isotopic compositions of the total organic carbon and total nitrogen on the 7th and 30th day, respectively.The results show that during preservation,the quantity of microbial communities tended to increase first and then decrease,with a wider variation range at higher moisture (23%).At the moisture content of 23%,th...     

热带气旋风场模型构造及特征参数估算

探讨了利用气旋风场分布的经验模型估算热带气旋尺度(8级大风圈半径)的方法.用美国联合台风警报中心整编的2001年西北太平洋热带气旋的“最佳尺度”资料,确定了各模型的经验常数,并计算了各模型的估算精度.结果表明,“VBogus”模型能获得热带气旋(Tropical Cyclone,简称TC)尺度的较好估算.基于“VBogus”模型,通过拟合热带气旋尺度的非对称分布,构造了能描述热带气旋非对称风场的"修正VBogus"模型,并估算了该模型中各参数在不同季节和不同地理区域的取值,为热带气旋尺度变化和非对称结构机制等问题的研究和应用提供新依据.     

西北地区地震综合预报探讨

本文初步总结了西北地区近十几年来地震综合预报的探索与进展。结果表明,在中长期趋势预测方面,对多数5级以上破坏性地震已具有测震学监测基础,综合预测结果基本上通过了统计检验;在短临预测方面仅对乌鲁木齐地区和兰州、银川、西安和武都范围以内发生的6 1/2级以上地震具有初步的监测基础。由19个震例获得以测震学资料为主的中长期趋势异常共73项,以地下水位、水氧、地电和地磁资料为主的短临异常共59项。本文概述了有关异常的特征和综合预报思路,讨论了有关问题和动向。     

一维波动方程波阻抗反演的同伦方法

文中从地震勘探一维波动方程反问题出发,研究了一种反演地层参数的同伦方法,该方法把非线性方程组的求解转化成常微分方程初值问题的数值求解,从而给出一种稳定的计算速度快、抗噪能力强的全局收敛的反演方法．理论模型和实例试算的结果表明了同伦方法是一种有效的反演算法,特别适用于非线性、多极值的地球物理反演问题,在地球物理非线性反演中具有广泛的应用前景．     

新近系全球界线层型剖面及点位(GSSP)简介

新近系全球界线层型剖面及点位(GSSP)位于意大利北部阿莱桑德利亚省卡洛西奥村的勒梅-卡洛西奥剖面,点位在距剖面之顶35m处。根据国际地层委员会的决议,作为界线定义的标志事件是:C6Cn.2n地磁极性时间带的底、浮游有孔虫Paragloborotalia kugleri的最低发生面及钙质超微化石Reticulofenstra bisecta的灭绝面(NN1带的底)附近。     

Effects of Overpressured Fluid Flow on Petroleum Accumulationin the Yinggehai Basin

The Yinggehai Basin is a strongly overpressured Cenozoic basin developed in the northern continental shelf of the South China Sea. The flow of overpressured fluids in this basin has given rise to strong effects on petroleum accumulation. (1) The overpressured fluid flow has enhanced the maturation of shallow-buried source rocks, which has caused the source rocks that would have remained immature under the conduction background to be mature for hydrocarbon generation. As a result, the overpressured fluid flow has increased the volume and interval of mature source rocks. (2) The overpressured fluid flow has strong extraction effects on the immature or low-mature source rocks in the shallow parts. This has increased, to some extent, the expulsion efficiency of the source rocks. More importantly, the extraction effects have strongly limited the effectiveness of biomarker parameters from oil and condensate in reflecting the source and maturity of the oil and gas. (3) The flow has caused the sandstones in the