用颗粒锆石分层蒸发法确定云开群罗罅组的时代

混入了较多围岩的火山岩样品不能直接用全岩或混合锆石进行年代测定,只有采用微区定年方法分别对不同成因的样品进行定年,才能获得具有一定地质意义的年龄值。本文采用颗粒锆石分层蒸发法分别对云开群罗罅组变英安岩及变流纹岩中不同成因锆石进行年龄测定,获得该火山岩之形成年龄为９２２Ｍａ,９４０Ｍａ;后期地质事件年龄为６４３Ｍａ～７１６Ｍａ,４２７Ｍａ～４７３Ｍａ及物源区的年龄为１６１６Ｍａ,２０８４Ｍａ。     

Standard techniques for presentation and analysis of crater size-frequency data

In September 1977, a crater studies workshop was held for the purpose of developing standardized data analysis and presentation techniques. This report contains the unanimous recommendations of the participants. This first meeting considered primarily crater size-frequency data. Future meetings will treat other aspects of crater studies such as morphologies.     

The correlation of multi-angle thermal infrared data and the choice of optimal view angles

The relationship between multi-angle thermal in-frared radiance of non-isothermal mixed pixel and black bodys radiance of components can be expressed by the matrix formula[1] ,()()(),kkjbjLwLTllq= (1) here l represents wave length of electronic magnetic wave, kq means zenith angle of view direction, (,)LTlq means the measured radiance, ,()kjw is called the matrix of system抯effective emissivities, T means the temperature in K degree, ()bLTl means the radiance of black body described by plank…     

Effect of Wave Groups on Wave Run-up

-The effect of wave group on wave run-up on a slope dike is mainly discussed in this paper. Two simulating methods of wave group and their applications in laboratory are introduced. Synthesizing the research results of wave run-up on a slope dike, the effect of wave group on wave run-up on a slope dike in coastal protection engineering is studied as the main point.     

Long Waves Induced by Wave Groups over a Trench

The second order long waves of the mean water free surface displacement induced by the wave groups over a trench are discussed in this paper. The incident wave groups are supposed to be superposed by 2 linear waves with different amplitudes, phases and slightly different frequencies. Some of the theoretical formulas and numerical results are presented.     

A short history of Ocean Station Papa and Line P

This short article summarises the origins of observations at Ocean Station Papa, the evolution into Line P and the subsequent history of observations along that line.     

考虑群桩效应的海洋平台桩—土—结构共同工作研究

考虑群桩效应的近海导管架平台的桩、土结构共同工作研究是一个很复杂的课题，要考虑很多因素。在平台结构的概念设计或初步设计中则可采用一些近似方法。本文根据目前国内外对群桩研究的成果，依据文克尔相互作用模型，提出了一个较方便实用的群桩效应计算方法，并建立了考虑群桩效应的桩—土—结构共同工作的计算模型，通过编制计算机程序得到实现，最后根据算例分析得到有关结论     

视觉认知的自适应多级岛屿群空间模式提取

针对当前电子地图显示范围以及人眼视觉分辨能力的限制,该文提出了符合视觉认知规律的自适应多级岛屿群空间模式,基于动态邻近图、最小生成树、最小面积外接矩形等概念设计了岛屿群多级空间模式提取算法。实验结果表明,该方法有效顾及了岛屿群显示的空间尺度,能够自适应地生成符合显示尺度要求的岛屿群多级空间模式,提高了空间模式识别的灵活性和有效性。     

一维Burgers方程的一类交替分段并行算法

研究并行算法解决应用并行计算机完成规模尽可能大的偏微分方程的数值求解问题。利用Hopf-Cole变换,将一维非线性Burgers方程转化为线性扩散方程,基于第二类Saul’yev型非对称格式和Crank-Nicolson格式对扩散方程进行差分离散,建立解Burgers方程的交替分段并行差分格式,并讨论该方法的稳定性,给出了数值算例。此算法把剖分节点分成若干组,在每组上构造能够独立求解的差分方程,因此具有并行本性,适合在高性能多处理器的并行计算机上使用。数值试验的结果表明此方法是有效的,且有较高的精度。     

中国马尾藻属的研究 Ⅶ.宾德种群的三个新种

在研究中国真马尾藻亚属SubgenusSargassum刺托组SectionAcanthocarpicae团徽托序亚组SubsectionGlomerulatae宾德系SeriesBinderiana宾德种群SpeciesGroupBinderia过程中，发现该种群新种3个，它们是中间马尾藻SargassumIntermediumTsengetLusp．nov.，模式标本于1975年5月15日由李伟新采自广西涸洲岛，模式标本号AST75－0594；琼海马尾藻SargassumqionghaienseTsengetLusp．nov，模式标本于1983年7月12日由陆保仁采自海南省琼海县沙，模式标本号CA83－0016；裂开马尾藻SargasumerumensTsengetLusp．nov，模式标本于1982年4月23日由陆探仁采自海南省三亚市鹿回头，模式标本号AST82－0413。模式标本均存于中国科学院海洋研究所植物标本室。