利用地面穿透雷达测定华盛顿州威拉帕沙堤八次大震沉降事件的证据

测定俯冲带全新世地震的一种新方法是将地面穿透雷达，振动取芯和加速同谱测定年龄的结果综合起来，用于研究华盛顿西南威拉帕湾以西的沙堤岬年龄。     

Far-Ultraviolet Emission from Elliptical Galaxies at z = 0.55

The rest-frame UV-to-optical flux ratio, which characterizes the "UV upturn" phenomenon, is potentially the most sensitive tracer of age in elliptical galaxies; models predict that it may change by orders of magnitude over the course of a few gigayears. In order to trace the evolution of the UV upturn as a function of redshift, we have used the far-UV camera on the Space Telescope Imaging Spectrograph to image the galaxy cluster CL 0016+16 at z=0.55. Our 25"x25" field includes four bright elliptical galaxies, spectroscopically confirmed to be passively evolving cluster members. The weak UV emission from the galaxies in our image demonstrates that the UV upturn is weaker at a look-back time approximately 5.6 Gyr earlier than our own, as compared to measurements of the UV upturn in cluster E and S0 galaxies at z=0 and z=0.375. These images are the first with sufficient depth to demonstrate the fading of the UV upturn expected at moderate redshifts. We discuss these observations and the implications for the formation history of galaxies.     

岩石图象分析在强胶结储层中流体流动通过特征方面的应用：美国,宾夕法尼亚

凯思油田储层是上泥盆系强胶结砂岩，平均孔隙率为１１５。大多数孔隙空间是自生粘土中的显微孔隙。尽管品质较差，但在注水条件下，该储层每口井日产１７桶原油。本文的目的是根据储层孔隙显微结构特征来解释这一现象，对凯思储层薄片的数字图象资料进行统计分析表明，存在五种孔隙类型，其中两种（孔隙类型４和５）是长石溶解的产物，图像分析结果与岩心压汞资料的对比表明，孔隙类型４具有足够大的喉道控制储层的渗透率。然而，若