SCUBA observations of Hawaii 167

We present the first submillimetre observations of the z =2.36 broad absorption line system Hawaii 167. Our observations confirm the hypothesis that Hawaii 167 contains a massive quantity of dust, the optical depth of which is sufficient to extinguish completely our ultraviolet view of a central, buried quasar. The submillimetre luminosity and associated dust mass of Hawaii 167 are similar to those of the ultraluminous class of infrared galaxies, supporting the existence of an evolutionary link between these and the active galaxy population. Hawaii 167 appears to be a young quasar that is emerging from its dusty cocoon.     

基于Fuller投影的六边形球面离散格网生成算法

随着云计算、航天遥感、地理信息、导航等技术的发展,用于空间信息剖分组织的全球多分辨率离散格网模型得到了长足发展。针对已有研究成果和当前研究现状,选取性能优异的六边形作为基本格网单元,Fuller多面体投影作为投影类型,提出了一种基于正八面体构建新型六边形球面离散格网的方法。全文系统地论述了此新型离散格网的生成算法并给出了相应实验结果,最后与基于Snyder等积多面体投影的格网进行比较,得出其特点和应用前景。     

地震各向异性流体检测技术在胜利油田垦71井区的应用(英文)

根据Chapman理论模型,在各向异性介质(如HTI介质)中,当入射角在0-45。范围内,慢横波会发生较大的衰减和频散,且对流体粘度敏感,而P波和快横波则比较小。对于沿裂隙法向传播的慢横波,其振幅受流体影响很大。因此,在P波响应对流体不敏感的情况下,可利用慢横波来获得裂隙型油气藏的流体信息。本文分析了胜利油田垦71地区三维三分量地震数据,检测出的慢横波振幅和旅行时异常与该区的测井资料十分吻合。分析结果还发现,与含油区相比,含水区会产生更高的横波分裂。在含水区,慢横波振幅会产生明显变化,而在含油区则几乎没有变化。     

贵州台江革一黔东统杷榔组沉积环境初探

贵州台江革一杷榔组出露完整、富含化石,其中—上部层位产有类群组合多样的杷榔动物群,为杷榔动物群的一个重要产地。本文通过详细的野外观察,结合生物化石保存情况及岩石薄片的分析结果,对革一杷榔组沉积环境及其海平面变化规律进行了综合分析,认为革一杷榔组的沉积位于盐度正常、较深水的陆棚环境,生物生活环境多为氧化—弱氧化环境,富含化石的层位经历了快速沉积事件,整组的沉积由底向上海水经历了由深至浅的变化过程,但其间经历2次小的波动,水体变深后变浅,并出现还原—氧化界面的波动 。     

An Observed Decline in the Amplitude of Recent Solar-Cycle Peaks

There has been much speculation about the extended minimum between Solar Cycles 23 and 24. Cycle 24 itself has been unusually weak compared with recent cycles. We present quantitative evidence for the weakness of both Cycles 23 and, particularly, 24. The data are objective indices derived from precision photometric images obtained on a daily basis at the San Fernando Observatory. These data form the longest running, homogeneous photometric record known to us. We show sunspot areas from red images and facular/network areas from Ca ii K-line images. Spot and facular area are a simple and direct measurement of the strength of solar activity. The data clearly show the decline in the amplitude of sunspot maxima for Cycles 23 and 24 compared with Cycle 22. The relative amplitudes of mean spot area for Cycles 22 through 24 are 1.0, 0.74, and 0.37, respectively. There is also an indication that the facular-to-spot area ratio has increased in Cycle 24.     

The geologist's dilemma: predicting the future behaviour of buried radioactive wastes

The last 10–15 years have produced a considerable amount of research into the geological disposal of radioactive wastes. This has had some very beneficial spin-offs for the geosciences. There are, however, a number of areas where it is difficult for earth scientists to provide quantitative information required for the types of long-term safety assessment being performed at present. With the likely increased stringency with which we may begin to treat other industrial wastes, much is to be learned from the radioactive waste experience. This article reviews some of the geological issues in constraining long-term predictions, discusses how geological data are used, and questions exactly what it is that we are trying to achieve in the management of these wastes and in the regulations concerning their disposal.